CN110965391B - Method for manufacturing high-strength white craft paper - Google Patents
Method for manufacturing high-strength white craft paper Download PDFInfo
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- CN110965391B CN110965391B CN201911305613.5A CN201911305613A CN110965391B CN 110965391 B CN110965391 B CN 110965391B CN 201911305613 A CN201911305613 A CN 201911305613A CN 110965391 B CN110965391 B CN 110965391B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/16—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising curable or polymerisable compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
- D21H23/48—Curtain coaters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
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Abstract
The invention relates to the technical field of pulping and papermaking, in particular to a method for manufacturing high-strength white craft paper, and specifically, the invention utilizes a coating composition and grey-bottom white board wood pulp to prepare high-grade coated white board paper. The coating composition of the invention greatly replaces the industrial synthetic latex with the biological natural adhesive, solves the problems of difficult degradation, environmental pollution and the like of the industrial synthetic latex, simultaneously, the addition of the modified konjac polysaccharide, the citrus pectin and the nano modified soybean protein can effectively improve the printing performance of white board paper, and the optimal addition amount is determined by exploration, thereby having good market prospect.
Description
Technical Field
The invention relates to the technical field of pulping and papermaking, in particular to a method for manufacturing a high-strength white craft paper, specifically, the invention utilizes a coating composition and grey-bottom white board wood pulp to prepare the white craft paper, and especially relates to coated white board paper, grey-bottom white board paper or white board paper.
Background
The coated white board generally comprises a surface layer, a lining layer, a core layer and a bottom layer, wherein the first layer is surface layer pulp, is required to have high whiteness and certain strength, and usually adopts bleached sulfate wood pulp or is added with partial bleached chemical straw pulp and white paper edge waste paper pulp; the second layer is a lining layer, and also needs to have certain whiteness, and 100 percent mechanical wood pulp or light-colored waste paper pulp is usually used; the third layer is a core layer which mainly plays a filling role to increase the thickness of the paperboard, generally adopts mixed waste paper pulp or straw pulp, the last layer is a bottom layer which has the advantages of improving the appearance of the paperboard and improving the strength, and the bottom surface of the paperboard is in multiple gray colors and is usually made of high-yield pulp or better waste paper pulp.
Generally, the surface layer of a coated whiteboard will be covered with a coating that absorbs ink well in order to obtain a paper surface with good uniformity and smoothness. The paper coating process is that the pigment in the coating is filled and covers the uneven surface formed by criss-cross coating base paper fibers. The pigment in the coating has proper whiteness and particle size, and can improve the whiteness, smoothness and glossiness of coated paper and simultaneously endow the coated paper with good ink absorptivity. At present, the main component pigments of the paint include three types of natural mineral pigments, artificial pigments and synthetic pigments, wherein the natural mineral raw materials mainly comprise calcium carbonate, china clay and kaolin; the artificial pigment mainly comprises aluminum hydroxide, calcined dolomite, titanium white and aluminum silicate; the synthetic pigment mainly comprises polystyrene resin and urea resin, wherein the calcium carbonate is used as the paint pigment with the widest application range and the largest dosage. The pigment type and properties determine the properties and quality of the coated base paper.
Coating binders, as a coating component second only to pigments, directly affect the quality of the coating and the coated paper. The coating adhesives can be divided into two categories according to the source of the adhesives, namely natural adhesives such as animal glue, starch and casein, and synthetic adhesives such as styrene-acrylic latex, styrene-butadiene latex and polyvinyl alcohol. Compared with natural adhesive, the synthetic latex adhesive has better elasticity and plasticity, and the coated paper produced by using the synthetic latex adhesive as the coating adhesive is easy to generate higher glossiness after calendaring, high paper surface smoothness, good flexibility, strong water resistance and good paper size stability. At present, synthetic latex adhesives are frequently used in white board coating in the prior art.
However, due to the increasing awareness of the living standard and environmental protection, the components of the cardboard adhesives are receiving more and more attention. The artificial synthetic adhesive through petroleum has the problems of toxic volatilization, difficult degradation, non-regeneration and the like, and the renewable environment-friendly adhesive becomes a substance which is increasingly favored by people. In order to solve the various defects of the natural adhesive in the using process, the prior art generally adopts a mode of adding an auxiliary adhesive, for example, a soybean protein polymer is added to improve the rheological property and the solid content of the coating, however, the single addition of the soybean protein polymer has limited improvement on the performance of the coating and cannot completely meet the requirements of industrial production, and the whiteness, smoothness, ink adsorbability and other properties of the produced coated white board paper need to be further improved.
Therefore, it is an urgent problem in the art to obtain a coating composition with good properties for producing coated white board paper, and further to produce coated white board paper with high quality and low cost.
Disclosure of Invention
The invention aims to solve the problems of the prior art and provides a coating composition for producing the white craft paper and a preparation method thereof.
In one embodiment, the invention provides a coating composition for producing white top kraft liner board, which is characterized by comprising 40-120 parts of calcium carbonate, 5-30 parts of kaolin, 0.8-1.2 parts of a dispersing agent, 7.8-13 parts of latex, 1-8 parts of oxidized konjac glucomannan, 0.1-1.5 parts of citrus pectin, 1-4 parts of nano-modified soybean protein, 0.1-0.7 part of a rheological modifier, 0.15-0.3 part of a lubricating agent, 0.2-0.5 part of a water repellent agent, 0.1-0.3 part of an antifoaming agent, 0.03-0.05 part of sodium hydroxide and 50-80 parts of water.
In one embodiment, the coating composition consists of a precoating coating and a top coating, wherein the precoating coating comprises 83 parts of calcium carbonate, 21 parts of kaolin, 1.1 parts of sodium polyacrylate, 6.5 parts of anionic styrene-butadiene latex, 1-8 parts of oxidized konjac glucomannan, 0.1-1.5 parts of citrus pectin, 1-4 parts of silica nano-modified soybean protein, 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of an organic silicon defoamer, 0.03 part of sodium hydroxide and 75 parts of water;
in one embodiment, the components of the top-coat paint are 68 parts of calcium carbonate, 43 parts of kaolin, 1 part of sodium polyacrylate, 5.5 parts of anionic styrene-butadiene latex, 1-8 parts of oxidized konjac glucomannan, 0.1-1.5 parts of citrus pectin, 1-4 parts of nano modified soybean protein, 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of an organic silicon defoamer, 0.03 part of sodium hydroxide and 70 parts of water.
In one embodiment, the pre-coating paint contains 2.6 parts of silicon dioxide nano soybean protein, 7.5 parts of oxidized konjac glucomannan and 1 part of citrus pectin.
In one embodiment, the topcoat coating has 3.4 parts of silica nano soy protein; 5.5 parts of oxidized konjac glucomannan and 1.2 parts of citrus pectin.
In one embodiment, soy protein is widely used in the paper industry as an adhesive for the preparation of white board coatings, for example, the soy protein polymer Pro-Cote4610 is used as an additive for the preparation of white board coatings, and in general, in order to further improve the performance of soy protein as a coating additive in the field, a modified mode, for example, nano-modification, is adopted for soy protein, and the adhesive property of silica nano-soy protein is further improved compared with the original soy protein. The preparation method of the silica nano-soybean protein adopts a conventional method in the field, for example, referring to a method recorded in 'research on influence of a nano material on a soybean protein biological adhesive, a Master thesis of Zhang school, Jiangnan university, 2008', and carries out corresponding adjustment, and the specific steps are as follows:
dispersing soybean protein isolate in water, stirring for 30min, keeping at a certain temperature, adding 1.2% of nano-silica, stirring at 10000rpm for 2mins, and performing ultrasonic treatment for 0.5h to obtain the silica nano-modified soybean protein.
In one embodiment, the konjac glucomannan is a konjac polysaccharide, which has some inherent characteristics, such as poor sol stability, poor fluidity and the like, and is usually modified to improve the performance of the konjac glucomannan, such as deacetylation, crosslinking, esterification, oxidation, graft copolymerization modification and the like, and the modified konjac glucomannan is mostly used for preparing wood viscose. In the invention, the konjac glucomannan is subjected to oxidation modification, and the modification method can be performed by referring to a method known in the prior art, for example, referring to the modification method in 'study of konjac polysaccharide wood adhesive, majie, fujian agriculture and forestry university, master thesis, 2009' and carrying out corresponding adjustment, and the specific steps are as follows:
adding konjac powder distilled water into a flask, stirring for a period of time at room temperature by using a motor, and standing to swell the konjac powder into paste; taking lmol/L NaOH solution and 30% H2O2Adding the solution into a three-neck bottle of the swelled konjac fine powder paste, placing the three-neck bottle in a water bath kettle at 50 ℃ for reaction for 30min by stirring, adding a proper amount of the prepared anhydrous sodium sulfite solution to stop the oxidation reaction, slowly adding the rest NaOH solution for gelatinization for 10min, adding dilute hydrochloric acid and dilute sodium hydroxide to adjust the pH value to 6.5, cooling and discharging.
In one embodiment, the citrus pectin can be prepared by any method known in the art for preparing citrus pectin, for example, by taking citrus peel, boiling with water for 5 minutes, adding a 1:1 hydrochloric acid solution and water, refluxing for half an hour, filtering to remove solids to obtain a citrus pectin solution.
In one embodiment, the present invention provides a method for preparing a coating composition for producing kraft white cardboard, the preparation steps comprising:
mixing kaolin, calcium carbonate and sodium polyacrylate, stirring at 1600r/min for 8min, cooling to 1000r/min, sequentially adding oxidized konjac glucomannan citrus pectin, anionic styrene-butadiene latex and nano-modified soybean protein, stirring for 10min after adding one component, and finally adding carboxymethyl cellulose, polyethylene glycol, glyoxal, organic silicon defoamer and sodium hydroxide, stirring for 4min after adding one component, thus obtaining the coating.
In one embodiment, the present invention provides the use of a coating composition for producing kraft white board in the preparation of coated white board paper
In one embodiment, the present invention provides a coated white board prepared from a coating composition for producing white top kraft liner.
In other embodiments, the present invention also provides methods of making high-grade coated white board paper using the coating composition and grey-based white board wood pulp; the wood chip pulp of the white board with the ash bottom comprises ONP pulp, DIP pulp and OCC pulp.
Compared with the prior art, the invention has the following advantages: the coating composition for producing the coated white board paper of the invention greatly replaces the industrial synthetic latex with the biological natural adhesive, solves the problems of difficult degradation and environmental pollution of the industrial synthetic latex, simultaneously, the addition of the modified konjac polysaccharide, the citrus pectin and the nano modified soy protein can effectively improve the printing performance of the white board paper, and the best addition amount is determined by exploration, thereby having good market prospect.
Detailed Description
The effects of the coating composition for coating white board according to the present invention will be described in detail below with reference to the preferred embodiments of the present invention, but the following description should not be construed as limiting the scope of the present invention.
Example 1A method for manufacturing a high-strength white craft paper
This example provides a method for preparing a coating composition for coating white board paper with excellent properties by adding modified konjac polysaccharides, citrus pectin, and nano-modified soy protein.
The method comprises the following specific steps:
1. preparing oxidized konjac glucomannan:
(1) 45g of konjac fine powder and 3L of distilled water are added into a flask, stirred for a period of time by a motor at room temperature and then kept stand to be dissolved and swelled into paste.
(2) 10ml of a solution of L mol/L NaOH and 10ml of 30% H are taken2O2Adding the solution into a three-neck bottle of the swelled konjac fine powder paste, placing the three-neck bottle in a water bath kettle at 50 ℃ for reaction for 30min by stirring, adding a proper amount of the prepared anhydrous sodium sulfite solution to stop the oxidation reaction, then slowly adding the rest 20ml of NaOH solution for gelatinization for 10min, adding dilute hydrochloric acid and dilute sodium hydroxide after a period of time to adjust the pH value to 6.5, cooling and discharging for later use.
2. Preparing citrus pectin:
boiling 100g of orange peel with water for 5 min, adding 50ml of 1:1 hydrochloric acid solution and 400ml of water, refluxing for half an hour, and filtering to remove solids to obtain orange pectin solution for later use.
3. Preparation of silica nano-modified soy protein:
dispersing 100g of soybean protein isolate in 1L of water, stirring for 30min, keeping a certain temperature, adding 1.2% of nano-silicon dioxide, stirring at 10000rpm for 2mins, and performing ultrasonic treatment for 0.5h to obtain the nano-modified soybean protein.
4. Preparation of the precoating paint:
68 parts of kaolin and 21 parts of calcium carbonate are mixed with 1 part of sodium polyacrylate, the mixture is stirred for 8min at the rotating speed of 1600r/min, after the mixture is uniformly stirred, the stirring rotating speed is reduced to 1000r/min, 1-8 parts of oxidized konjac glucomannan, 0.1-1.5 parts of citrus pectin, 4.5 parts of anionic styrene-butadiene latex and 1-4 parts of nano modified soybean protein are sequentially added, the mixture is stirred for 10min after each component is added, finally, 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of organic silicon defoamer and 0.03 part of sodium hydroxide are sequentially added, and the mixture is stirred for 4min after each component is added, so that the precoating paint is prepared.
5. Preparing a top coating:
mixing 83 parts of kaolin and 43 parts of calcium carbonate with 1.1 parts of sodium polyacrylate, stirring for 8min at a rotating speed of 1600r/min, after stirring uniformly, reducing the stirring rotating speed to 1000r/min, sequentially adding 1-8 parts of oxidized konjac glucomannan, 0.1-1.5 parts of citrus pectin, 4.5 parts of anionic styrene-butadiene latex and 1-4 parts of nano modified soybean protein, stirring for 10min after adding each component, finally adding 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of organic silicon defoamer and 0.03 part of sodium hydroxide, and stirring for 4min after adding each component to prepare the surface coating.
Example 2 method of preparing coated white board using the coating composition prepared in example 1
This example provides a coated white board prepared from the coating composition obtained in example 1, and a high-grade coated white board with excellent printing performance is obtained by the following steps:
1. preparation of various slurries:
(1) preparing ONP slurry: taking Japan No. 3 and American waste No. 8 as raw materials, wherein the weight ratio of the Japan No. 3 to the American waste No. 8 is 3:7, and obtaining OCC pulp through disintegration, screening, deslagging, deinking, concentration and thermal dispersion; the ONP deinking pulp has the freeness of 210csf, the whiteness value of 40ISO and the impurity point content of 980mm2/m2；
(2) Preparation of DIP slurry: taking the American waste No. 3 and the American waste No. 8 as raw materials, wherein the weight ratio of the American waste No. 3 to the American waste No. 8 is 1:1, and obtaining OCC pulp for later use through disintegration, screening, deslagging, deinking, concentration and thermal dispersion. The freeness of the DIP pulp is 230csf, the whiteness value is 55ISO, and the content of impurity points is 800mm2/m2
(3) Preparing OCC slurry: using domestic waste corrugated paper as a raw material, and obtaining OCC pulp through crushing, screening, deslagging, concentrating and thermal dispersion; the beating degree of the OCC pulp is 48.5 DEG SR.
2. Preparation of slurries at different levels
Preparing surface layer slurry: using the ONP slurry and the DIP slurry prepared in the steps as surface layer slurry, wherein the using ratio of the ONP slurry to the DIP slurry is 2:1, and the weight of the prepared slurry is 32.9g/m2；
Preparing lining layer slurry: the ONP slurry and the OCC slurry prepared in the steps are used as lining slurry, wherein the using ratio of the ONP slurry to the OCC slurry is 1:1, and the weight of the prepared slurry is 21.2g/m2；
Preparing core layer slurry: the OCC slurry prepared in the steps is used as core layer slurry, and the core layer slurry mixing ration is 96g/m2；
Preparing bottom layer slurry: the ONP slurry and the OCC slurry prepared in the steps are used as lining slurry, wherein the using ratio of the ONP slurry to the OCC slurry is 1:3, and the weight of the prepared slurry is 31.6g/m2；
3. Manufacturing base paper:
conveying each layer of pulp to a pulp flow box of a paper machine through respective feeding systems, feeding the pulp of each layer with a certain concentration to a four-layer forming net to form a wet paper sheet, and performing body paper making through pressing, a front drying part, surface sizing and hard calendering;
4. coating of
The coating base paper after hard calendering is sent to a curtain coater, curtain coating is carried out on the precoating coating prepared in the embodiment 1 on the front sizing layer of the coating base paper to form a precoating layer, then the coating base paper forming the curtain coating is sent to a scraper coater, and scraper coating is carried out on the top coating prepared in the embodiment 1 to form a top coating, wherein the coating weight of the precoating layer is 8g/m2The coating weight of the top coat is 11g/m2。
5. Soft calendering and coiling:
after coating, soft press polishing, reeling, rewinding and warehousing.
Example 3 Effect of different amounts of oxidized Konjac glucomannan and Citrus pectin on white board paper Performance
In order to search the influence of the addition amounts of different konjac glucomannan oxides and citrus pectin on the performance of the white board paper and seek to find the most suitable addition amount of the konjac glucomannan oxides and the citrus pectin, the following experimental design is adopted in the embodiment:
in the preparation of the surface coating paint and the pre-coating paint, different addition amounts of konjac glucomannan oxide and citrus pectin oxide are adopted for treatment, and the step of adding silica nano-modified soy protein into the surface coating paint and the pre-coating paint is omitted, so as to analyze and determine the most appropriate addition amount of konjac glucomannan oxide and citrus pectin oxide, wherein the specific addition amount is shown in table 1,
TABLE 1 addition amount of oxidized konjac glucomannan and citrus pectin
The above-mentioned different concentrations, every group sets up 3 parallel experiments, the concrete step is as follows
1. Preparing oxidized konjac glucomannan:
(1) 45g of konjac fine powder and 3L of distilled water are added into a flask, stirred for a period of time by a motor at room temperature and then kept stand to be dissolved and swelled into paste.
(2) 10ml of a solution of L mol/L NaOH and 10ml of 30% H are taken2O2Adding the solution into a three-neck bottle of the swelled konjac fine powder paste, placing the three-neck bottle in a water bath kettle at 50 ℃ for reaction for 30min by stirring, adding a proper amount of the prepared anhydrous sodium sulfite solution to stop the oxidation reaction, then slowly adding the rest 20ml of NaOH solution for gelatinization for 10min, adding dilute hydrochloric acid and dilute sodium hydroxide after a period of time to adjust the pH value to 6.5, cooling and discharging for later use.
2. Preparing citrus pectin:
boiling 100g of orange peel with water for 5 min, adding 50ml of 1:1 hydrochloric acid solution and 400ml of water, refluxing for half an hour, and filtering to remove solids to obtain orange pectin solution for later use.
3. Preparation of the precoating paint:
68 parts of kaolin and 21 parts of calcium carbonate are mixed with 1 part of sodium polyacrylate, stirring is carried out for 8min at a rotating speed of 1600r/min, after uniform stirring is carried out, the stirring rotating speed is reduced to 1000r/min, oxidized konjac glucomannan, citrus pectin and 4.5 parts of anionic styrene-butadiene latex are sequentially added, stirring is carried out for 10min after each component is added, finally, 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of organic silicon defoamer and 0.03 part of sodium hydroxide are sequentially added, stirring is carried out for 4min after each component is added, and the precoating paint is prepared, wherein the adding amounts of the oxidized konjac glucomannan and the citrus pectin are shown in table 1, the control group does not contain the oxidized konjac glucomannan and the citrus pectin, and the adding amount of the anionic styrene-butadiene latex is 9.5 parts.
4. Preparing a top coating:
mixing 83 parts of kaolin and 43 parts of calcium carbonate with 1.1 parts of sodium polyacrylate, stirring for 8min at a rotating speed of 1600r/min, after stirring uniformly, reducing the stirring rotating speed to 1000r/min, sequentially adding oxidized konjac glucomannan, citrus pectin and 4.5 parts of anionic styrene-butadiene latex, stirring for 10min after adding each component, and finally adding 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of an organic silicon defoamer and 0.03 part of sodium hydroxide, and stirring for 4min after adding each component to prepare the surface coating, wherein the addition amounts of the oxidized konjac glucomannan and the citrus pectin are shown in Table 1, the control group does not contain the oxidized konjac glucomannan and the citrus pectin, and the addition amount of the anionic styrene-butadiene latex is 9.5 parts.
5. Preparation of various slurries:
(1) preparing ONP slurry: taking Japan No. 3 and American waste No. 8 as raw materials, wherein the weight ratio of the Japan No. 3 to the American waste No. 8 is 3:7, and obtaining OCC pulp through disintegration, screening, deslagging, deinking, concentration and thermal dispersion; the ONP deinking pulp has the freeness of 210csf, the whiteness value of 40ISO and the impurity point content of 980mm2/m2；
(2) Preparation of DIP slurry: taking the American waste No. 3 and the American waste No. 8 as raw materials, wherein the weight ratio of the American waste No. 3 to the American waste No. 8 is 1:1, and obtaining OCC pulp for later use through disintegration, screening, deslagging, deinking, concentration and thermal dispersion. The freeness of the DIP pulp is 230csf, the whiteness value is 55ISO, and the content of impurity points is 800mm2/m2
(3) Preparing OCC slurry: using domestic waste corrugated paper as a raw material, and obtaining OCC pulp through crushing, screening, deslagging, concentrating and thermal dispersion; the beating degree of the OCC pulp is 48.5 DEG SR.
6. Preparation of slurries at different levels
Preparing surface layer slurry: using the ONP slurry and the DIP slurry prepared in the steps as surface layer slurry, wherein the using ratio of the ONP slurry to the DIP slurry is 2:1, and the weight of the prepared slurry is 32.9g/m2；
Preparing lining layer slurry: the ONP slurry and the OCC slurry prepared by the steps are taken as lining slurry, wherein the ONP slurry and the OC slurryThe use ratio of the C pulp is 1:1, and the weight of the prepared pulp is 21.2g/m2；
Preparing core layer slurry: the OCC slurry prepared in the steps is used as core layer slurry, and the core layer slurry mixing ration is 96g/m2；
Preparing bottom layer slurry: the ONP slurry and the OCC slurry prepared in the steps are used as lining slurry, wherein the using ratio of the ONP slurry to the OCC slurry is 1:3, and the weight of the prepared slurry is 31.6g/m2；
7. Manufacturing base paper:
conveying each layer of pulp to a pulp flow box of a paper machine through respective feeding systems, feeding the pulp of each layer with a certain concentration to a four-layer forming net to form a wet paper sheet, and performing body paper making through pressing, a front drying part, surface sizing and hard calendering;
8. coating of
Conveying the hard calendered coating base paper to a curtain coater, performing curtain coating on the precoating layer prepared in the step 3 on the front sizing layer of the coating base paper to form a precoating layer, conveying the coating base paper forming the curtain coating to a scraper coater, and performing scraper coating by using the top coating paint prepared in the step 4 to form a top coating, wherein the coating weight of the precoating layer is 8g/m2The coating weight of the top coat is 11g/m2。
9. Soft calendering and coiling:
after coating, soft press polishing, reeling, rewinding and warehousing.
10. White board paper test result
The white board 1-white board 9 prepared by the method and the performance of a control group are detected, and the specific detection indexes are whiteness, glossiness, PPS roughness, ink absorbability and printing surface strength, wherein,
the whiteness of the coated white board paper is detected according to GB/T7974-2004;
the glossiness of the coated white board paper is detected according to GB/T8941.3-1988;
the PPS roughness of the coated white board paper is detected according to GB/T2679.9-1993;
ink absorbency measurement of coated white board paper was tested according to GB/T12911-991);
the strength of the printing surface of the coated white board paper is detected according to GB/T10341-1989;
the effect of the addition of different oxidized konjac glucomannan and citrus pectin on the white board paper performance is shown in Table 2
TABLE 2 white paperboard 1-white paperboard 9 Properties
From the results shown in table 2, it can be seen that the addition of the oxidized konjac glucomannan and the citrus pectin improves various parameters related to printing and surface properties compared with the control group, which indicates that the oxidized konjac glucomannan and the citrus pectin are beneficial to improving the printing and surface properties of the white board paper prepared by the oxidized konjac glucomannan and the citrus pectin. Further, from the results shown in table 2, it was found that the white board paper prepared by adding 7.5 parts of oxidized konjac glucomannan, 1 part of citrus pectin to the precoating paint, 5.5 parts of oxidized konjac glucomannan and 1.2 parts of citrus pectin to the top coating paint (i.e., white board paper 6) had the best printing and surface properties.
Example 4 Effect of the amount of silica Nano-modified Soy protein added on white Board Performance
In order to search the influence of the addition of different silica nano-modified soy proteins on the performance of the white board paper and seek to find the most suitable silica nano-modified soy protein addition, the following experimental design is adopted in the embodiment:
in the preparation of the surface coating paint and the pre-coating paint, the addition amounts of the soy protein modified by different silicon oxide nanometers are adopted for treatment, and the step of adding the konjac glucomannan and the citrus pectin into the surface coating paint and the pre-coating paint is omitted, so as to analyze and determine the most suitable soy protein modified by the silicon oxide nanometers, wherein the specific addition amounts are shown in the table 1,
TABLE 3 addition amount of silica nano-modified soy protein
The above-mentioned different concentrations, every group sets up 3 parallel experiments, the concrete step is as follows
1. Preparation of silica nano-modified soy protein:
dispersing 100g of soybean protein isolate in 1L of water, stirring for 30min, keeping a certain temperature, adding 1.2% of nano-silicon dioxide, stirring at 10000rpm for 2mins, and performing ultrasonic treatment for 0.5h to obtain the nano-modified soybean protein.
2. Preparation of the precoating paint:
68 parts of kaolin and calcium carbonate are mixed with 1 part of sodium polyacrylate, the mixture is stirred for 8min at the rotating speed of 1600r/min, after the mixture is uniformly stirred, the stirring rotating speed is reduced to 1000r/min, silica nano-modified soybean protein and 4.5 parts of anionic styrene-butadiene latex are sequentially added, each component is added and stirred for 10min, finally, 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of organic silicon defoamer and 0.03 part of sodium hydroxide are sequentially added, each component is added and stirred for 4min, and the precoating paint is prepared, wherein the adding amount of the silica nano-modified soybean protein is shown in table 3, the comparison group does not contain the silica nano-modified soybean protein, and the adding amount of the anionic styrene-butadiene latex is 9.5 parts (the same as the comparison group in example 3, and the adhesive is only anionic styrene-butadiene latex).
3. Preparing a top coating:
83 parts of kaolin and 43 parts of calcium carbonate are mixed with 1.1 parts of sodium polyacrylate, the mixture is stirred for 8min at a rotating speed of 1600r/min, after the mixture is uniformly stirred, the stirring rotating speed is reduced to 1000r/min, konjac glucomannan oxide, citrus pectin and 4.5 parts of anionic styrene-butadiene latex are sequentially added, each component is added and then stirred for 10min, finally, 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of an organic silicon defoamer and 0.03 part of sodium hydroxide are sequentially added, each component is added and then stirred for 4min, and the coating is prepared, wherein the addition amount of the soy protein modified by silica nano is shown in table 3, the control group does not contain the soy protein modified by silica nano, and the addition amount of the anionic styrene-butadiene latex is 9.5 parts (the same as the control group in example 3, and the adhesive is only anionic styrene-butadiene latex).
4. Preparation of various slurries:
(1) preparing ONP slurry: taking Japan No. 3 and American waste No. 8 as raw materials, wherein the weight ratio of the Japan No. 3 to the American waste No. 8 is 3:7, and obtaining OCC pulp through disintegration, screening, deslagging, deinking, concentration and thermal dispersion; the ONP deinking pulp has the freeness of 210csf, the whiteness value of 40ISO and the impurity point content of 980mm2/m2；
(2) Preparation of DIP slurry: taking the American waste No. 3 and the American waste No. 8 as raw materials, wherein the weight ratio of the American waste No. 3 to the American waste No. 8 is 1:1, and obtaining OCC pulp for later use through disintegration, screening, deslagging, deinking, concentration and thermal dispersion. The freeness of the DIP pulp is 230csf, the whiteness value is 55ISO, and the content of impurity points is 800mm2/m2
(3) Preparing OCC slurry: using domestic waste corrugated paper as a raw material, and obtaining OCC pulp through crushing, screening, deslagging, concentrating and thermal dispersion; the beating degree of the OCC pulp is 48.5 DEG SR.
5. Preparation of slurries at different levels
Preparing surface layer slurry: using the ONP slurry and the DIP slurry prepared in the steps as surface layer slurry, wherein the using ratio of the ONP slurry to the DIP slurry is 2:1, and the weight of the prepared slurry is 32.9g/m2；
Preparing lining layer slurry: the ONP slurry and the OCC slurry prepared in the steps are used as lining slurry, wherein the using ratio of the ONP slurry to the OCC slurry is 1:1, and the weight of the prepared slurry is 21.2g/m2；
Preparing core layer slurry: the OCC slurry prepared in the steps is used as core layer slurry, and the core layer slurry mixing ration is 96g/m2；
Preparing bottom layer slurry: prepared by the stepsThe prepared ONP slurry and OCC slurry are lining slurry, wherein the using ratio of the ONP slurry to the OCC slurry is 1:3, and the weight of the prepared ONP slurry to the prepared OCC slurry is 31.6g/m2；
6. Manufacturing base paper:
conveying each layer of pulp to a pulp flow box of a paper machine through respective feeding systems, feeding the pulp of each layer with a certain concentration to a four-layer forming net to form a wet paper sheet, and performing body paper making through pressing, a front drying part, surface sizing and hard calendering;
7. coating of
Conveying the hard calendered coating base paper to a curtain coater, performing curtain coating on the precoating layer prepared in the step 3 on the front sizing layer of the coating base paper to form a precoating layer, conveying the coating base paper forming the curtain coating to a scraper coater, and performing scraper coating by using the top coating paint prepared in the step 4 to form a top coating, wherein the coating weight of the precoating layer is 8g/m2The coating weight of the top coat is 11g/m2。
8. Soft calendering and coiling:
after coating, soft press polishing, reeling, rewinding and warehousing.
9. White board paper test result
The white board 10-white board 13 prepared by the method and the performance of a control group are detected, and the specific detection indexes are whiteness, glossiness, PPS roughness, ink absorbability and printing surface strength, wherein,
the whiteness of the coated white board paper is detected according to GB/T7974-2004;
the glossiness of the coated white board paper is detected according to GB/T8941.3-1988;
the PPS roughness of the coated white board paper is detected according to GB/T2679.9-1993;
ink absorbency measurement of coated white board paper was tested according to GB/T12911-991);
the strength of the printing surface of the coated white board paper is detected according to GB/T10341-1989;
the effect of silica nano-modified soy protein on white board paper performance is shown in table 4
TABLE 4 white board 10-white board 13 Properties
As can be seen from the results in table 4, the addition of silica-modified soy protein is beneficial to improving PPS roughness and gloss of the paper board, and the silica-modified soy protein promotes rapid curing of the coating, increases the coating structure with high pore volume, and improves the ink absorption of the coated paper. Further, from the results of 4, it was found that the amount of silica nano-soy protein added in the pre-coating paint was 2.6 parts and the amount of silica nano-soy protein added in the top-coating paint was 3.4 parts (i.e., white board 11), and the white board prepared was the best in printing and surface properties.
Example 5 synergistic Effect of Simultaneous addition of silica Nano Soybean protein, oxidized Konjac glucomannan and Citrus pectin on white Board paper Performance
It can be seen from the above examples that whether silica nano soy protein is added, or konjac glucomannan and citrus pectin are added, the printing and surface properties of the white board paper can be improved to a certain extent, and this example further explores whether the simultaneous addition of silica nano soy protein, konjac glucomannan and citrus pectin can synergistically improve the physical properties of the white board paper, and the experimental design is as follows:
the addition amounts of the silicon dioxide nano soybean protein, the oxidized konjac glucomannan and the citrus pectin determined in the embodiment are selected, namely the addition amount of the silicon dioxide nano soybean protein in the precoating paint is 2.6 parts, and the addition amount of the silicon dioxide nano soybean protein in the surface coating paint is 3.4 parts; the addition amount of the konjac glucomannan oxide in the precoating paint is 7.5 parts, the addition amount of the citrus pectin is 1 part, the addition amount of the konjac glucomannan oxide in the surface coating paint is 5.5 parts, and the addition amount of the citrus pectin is 1.2 parts, so that the corresponding coated white board paper 14 is prepared, and the method specifically comprises the following steps:
1. preparing oxidized konjac glucomannan:
(1) 45g of konjac fine powder and 3L of distilled water are added into a flask, stirred for a period of time by a motor at room temperature and then kept stand to be dissolved and swelled into paste.
(2) 10ml of a solution of L mol/L NaOH and 10ml of 30% H are taken2O2Adding the solution into a three-neck bottle of the swelled konjac fine powder paste, placing the three-neck bottle in a water bath kettle at 50 ℃ for reaction for 30min by stirring, adding a proper amount of the prepared anhydrous sodium sulfite solution to stop the oxidation reaction, then slowly adding the rest 20ml of NaOH solution for gelatinization for 10min, adding dilute hydrochloric acid and dilute sodium hydroxide after a period of time to adjust the pH value to 6.5, cooling and discharging for later use.
2. Preparing citrus pectin:
boiling 100g of orange peel with water for 5 min, adding 50ml of 1:1 hydrochloric acid solution and 400ml of water, refluxing for half an hour, and filtering to remove solids to obtain orange pectin solution for later use.
3. Preparation of silica nano-modified soy protein:
dispersing 100g of soybean protein isolate in 1L of water, stirring for 30min, keeping a certain temperature, adding 1.2% of nano-silicon dioxide, stirring at 10000rpm for 2mins, and performing ultrasonic treatment for 0.5h to obtain the nano-modified soybean protein.
4. Preparation of the precoating paint:
68 parts of kaolin and 21 parts of calcium carbonate are mixed with 1 part of sodium polyacrylate, stirring is carried out for 8min at a rotating speed of 1600r/min, after stirring is carried out uniformly, the stirring rotating speed is reduced to 1000r/min, oxidized konjac glucomannan, citrus pectin, silicon dioxide nano soybean protein and 4.5 parts of anionic styrene-butadiene latex are sequentially added, stirring is carried out for 10min after each component is added, finally, 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of organic silicon defoamer and 0.03 part of sodium hydroxide are sequentially added, and stirring is carried out for 4min after each component is added, so as to prepare the precoating coating, wherein the adding amount of the silicon dioxide nano soybean protein is 2.6 parts, the adding amount of the oxidized konjac glucomannan is 7.5 parts, and the adding amount of the citrus pectin is 1 part.
5. Preparing a top coating:
mixing 83 parts of kaolin and 43 parts of calcium carbonate with 1.1 parts of sodium polyacrylate, stirring for 8min at a rotating speed of 1600r/min, after stirring uniformly, reducing the stirring rotating speed to 1000r/min, sequentially adding oxidized konjac glucomannan, citrus pectin, silicon dioxide nano soybean protein and 4.5 parts of anionic styrene-butadiene latex, stirring for 10min after adding each component, and finally adding 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of an organic silicon defoamer and 0.03 part of sodium hydroxide, stirring for 4min after adding each component to prepare the surface coating, wherein the silicon dioxide nano soybean protein in the surface coating is 3.4 parts, the oxidized konjac glucomannan in the surface coating is 5.5 parts, and the pectin is 1.2 parts.
6. Preparation of various slurries:
(1) preparing ONP slurry: taking Japan No. 3 and American waste No. 8 as raw materials, wherein the weight ratio of the Japan No. 3 to the American waste No. 8 is 3:7, and obtaining OCC pulp through disintegration, screening, deslagging, deinking, concentration and thermal dispersion; the ONP deinking pulp has the freeness of 210csf, the whiteness value of 40ISO and the impurity point content of 980mm2/m2；
(2) Preparation of DIP slurry: taking the American waste No. 3 and the American waste No. 8 as raw materials, wherein the weight ratio of the American waste No. 3 to the American waste No. 8 is 1:1, and obtaining OCC pulp for later use through disintegration, screening, deslagging, deinking, concentration and thermal dispersion. The freeness of the DIP pulp is 230csf, the whiteness value is 55ISO, and the content of impurity points is 800mm2/m2
(3) Preparing OCC slurry: using domestic waste corrugated paper as a raw material, and obtaining OCC pulp through crushing, screening, deslagging, concentrating and thermal dispersion; the beating degree of the OCC pulp is 48.5 DEG SR.
7. Preparation of slurries at different levels
Preparing surface layer slurry: using the ONP slurry and the DIP slurry prepared in the steps as surface layer slurry, wherein the using ratio of the ONP slurry to the DIP slurry is 2:1, and the weight of the prepared slurry is 32.9g/m2；
Preparing lining layer slurry: the ONP slurry and the OCC slurry prepared in the steps are used as lining slurry, wherein the using ratio of the ONP slurry to the OCC slurry is 1:1, and the weight of the prepared slurry is 21.2g/m2；
Preparing core layer slurry: the OCC slurry prepared in the steps is used as core layer slurry, and the core layer slurry mixing ration is 96g/m2；
Preparing bottom layer slurry: the ONP slurry and the OCC slurry prepared in the steps are used as lining slurry, wherein the using ratio of the ONP slurry to the OCC slurry is 1:3, and the weight of the prepared slurry is 31.6g/m2；
8. Manufacturing base paper:
conveying each layer of pulp to a pulp flow box of a paper machine through respective feeding systems, feeding the pulp of each layer with a certain concentration to a four-layer forming net to form a wet paper sheet, and performing body paper making through pressing, a front drying part, surface sizing and hard calendering;
9. coating of
Conveying the hard calendered coating base paper to a curtain coater, performing curtain coating on the precoating layer prepared in the step 3 on the front sizing layer of the coating base paper to form a precoating layer, conveying the coating base paper forming the curtain coating to a scraper coater, and performing scraper coating by using the top coating paint prepared in the step 4 to form a top coating, wherein the coating weight of the precoating layer is 8g/m2The coating weight of the top coat is 11g/m2。
10. Soft calendering and coiling:
after coating, soft press polishing, reeling, rewinding and warehousing.
11. White board paper test result
The white board 1-white board 9 prepared by the method and the performance of a control group are detected, and the specific detection indexes are whiteness, glossiness, PPS roughness, ink absorbability and printing surface strength, wherein,
the whiteness of the coated white board paper is detected according to GB/T7974-2004;
the glossiness of the coated white board paper is detected according to GB/T8941.3-1988;
the PPS roughness of the coated white board paper is detected according to GB/T2679.9-1993;
ink absorbency measurement of coated white board paper was tested according to GB/T12911-991);
the strength of the printing surface of the coated white board paper is detected according to GB/T10341-1989;
the effect of the simultaneous addition of silica-based nano-soy protein, oxidized konjac glucomannan and citrus pectin on white board properties is shown in Table 5
TABLE 5 Properties of white board 14
As shown in Table 5, the simultaneous addition of the silica nano-soy protein, the oxidized konjac glucomannan and the citrus pectin significantly improves the surface and factor performance of the paperboard, compared with the single addition of the silica nano-soy protein or the single addition of the oxidized konjac glucomannan and the citrus pectin, and produces a synergistic effect.
The invention has been described in detail with respect to a general description and specific embodiments thereof, but it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. The coating composition for producing the white craft paper is characterized by comprising a precoating coating and a top coating, wherein the precoating coating comprises 21 parts of calcium carbonate, 68 parts of kaolin, 1 part of sodium polyacrylate, 4.5 parts of anionic styrene-butadiene latex, 7.5 parts of oxidized konjac glucomannan, 1 part of citrus pectin, 2.6 parts of silicon dioxide nano soybean protein, 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of an organic silicon defoamer, 0.03 part of sodium hydroxide and 75 parts of water; the surface coating comprises 43 parts of calcium carbonate, 83 parts of kaolin, 1.1 parts of sodium polyacrylate, 4.5 parts of anionic styrene-butadiene latex, 5.5 parts of oxidized konjac glucomannan, 1.2 parts of citrus pectin, 3.4 parts of silicon dioxide nano soybean protein, 0.48 part of carboxymethyl cellulose, 0.22 part of polyethylene glycol, 0.3 part of glyoxal, 1.5 parts of an organic silicon defoamer, 0.03 part of sodium hydroxide and 70 parts of water; the preparation method of the silica nanometer soybean protein comprises dispersing soybean protein isolate in water, stirring for 30min, keeping a certain temperature, adding 1.2% nanometer silica, stirring at 10000rpm for 2min, and performing ultrasonic treatment for 0.5h to obtain the silica nanometer soybean protein.
2. The coating composition for producing ivory board according to claim 1, wherein the oxidized konjac glucomannan is prepared by adding konjac refined powder distilled water to a flask, stirring the mixture at room temperature with a motor for a certain period of time, and then standing the mixture to swell it into paste; taking L mol/L NaOH solution and 30% H2O2Adding the solution into a three-neck bottle of the swelled konjac fine powder paste, placing the three-neck bottle in a water bath kettle at 50 ℃ for reaction for 30min by stirring, adding a proper amount of the prepared anhydrous sodium sulfite solution to stop the oxidation reaction, slowly adding the rest NaOH solution for gelatinization for 10min, adding dilute hydrochloric acid and dilute sodium hydroxide to adjust the pH value to 6.5, and cooling and discharging.
3. The coating composition for producing kraft liner board according to claim 2, wherein the citrus pectin is prepared by taking citrus peel, boiling with water for 5 minutes, adding 1:1 hydrochloric acid solution and water, refluxing for half an hour, and filtering to remove solids to obtain citrus pectin solution.
4. A method for preparing a coating composition for producing kraft white board according to any one of claims 1 to 3, the preparation steps being as follows:
mixing kaolin, calcium carbonate and sodium polyacrylate, stirring at a rotation speed of 1600r/min for 8min, after stirring uniformly, reducing the stirring rotation speed to 1000r/min, sequentially adding oxidized konjac glucomannan, citrus pectin, anionic styrene-butadiene latex and silicon dioxide nano soybean protein, stirring for 10min after adding one component, finally sequentially adding carboxymethyl cellulose, polyethylene glycol, glyoxal, an organic silicon defoamer and sodium hydroxide, and stirring for 4min after adding one component to prepare the coating.
5. Use of the coating composition according to any one of claims 1 to 3 for the production of kraft white board for the production of coated white board.
6. A coated white board prepared from the coating composition for producing kraft white board according to any one of claims 1 to 3.
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