CN107881842B - Method for preparing high-strength corrugated base paper by using straws and waste paper pulp - Google Patents
Method for preparing high-strength corrugated base paper by using straws and waste paper pulp Download PDFInfo
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- CN107881842B CN107881842B CN201711183636.4A CN201711183636A CN107881842B CN 107881842 B CN107881842 B CN 107881842B CN 201711183636 A CN201711183636 A CN 201711183636A CN 107881842 B CN107881842 B CN 107881842B
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 46
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Images
Classifications
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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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/003—Pulping cellulose-containing materials with organic compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/18—Pulping cellulose-containing materials with halogens or halogen-generating 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
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Abstract
The invention discloses a method for preparing high-strength corrugated raw paper by using straws and waste paper pulp, and relates to the field of papermaking by using cellulose; drying straws, removing straw skins, separating straw pith, crushing the straw pith, mixing the straw pith powder with NaOH and/or KOH solution with the mass concentration of 1-10% until the mass concentration of the materials is 0.5-5%, soaking the materials, washing the materials to be neutral, and adding water to obtain straw pith pulp, wherein the concentration of the straw pith is 0.5-5%; adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 1-8%, or adding hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 1-8%; and stirring or oscillating the straw pulp, washing to be neutral, mixing with the waste paper pulp, wherein the mass fraction of the straw pulp in the mixed paper pulp is 10-30%, and making the corrugated base paper by using the mixed paper pulp.
Description
Technical Field
The invention discloses a method for preparing high-strength corrugated base paper, relates to the field of papermaking by using cellulose, and particularly relates to a method for preparing high-strength corrugated base paper by using straws and waste paper pulp.
Background
China is a big agricultural country, the yield of straws can reach hundreds of millions of tons every year, and the huge resource is used as living energy in rural areas, most of the resources are abandoned on the ground or are burnt on the spot, and only a small part of the resources are used as feed or generate methane. The straw is composed of straw skin, straw pith and leaves, and the main components of the straw skin are cellulose and lignin; straw pulp contains a large amount of hemicellulose, starch and a small amount of protein components; the straw mainly contains crude protein, crude fat and saccharide.
At present, the papermaking raw materials in China mainly comprise wood, non-wood and waste paper. According to the measurement and calculation of China paper making society, in 2016, the wood pulp accounts for 23% of the total weight of the raw materials, the non-wood pulp accounts for 15%, and the waste paper pulp accounts for 62%. In recent years, the proportion of waste paper pulp is gradually increased, waste paper becomes an important resource for the development of the Chinese paper industry, and the circular economy characteristic of the sustainable development of the Chinese paper industry is more and more obvious. Among them, the corrugated base paper is one of the important constituent materials for producing corrugated cardboards. The corrugated base paper requires good fiber bonding strength, flat paper surface, better tightness and stiffness and certain elasticity so as to ensure that the manufactured carton has shockproof and pressure resistance. Corrugated paper is indispensable packaging paper in various industries, especially along with the prevalence of electric commercial network purchase in China in recent years, the demand for packaging paper is increased rapidly, the development of corrugated paper production industry is greatly promoted, a plurality of production enterprises choose to produce corrugated base paper by taking waste paper pulp as a raw material, but the corrugated base paper used in China is generally high in quantification, and the high-strength corrugated base paper is few, the added value is low, and the requirement of a carton factory for increasing the product quality cannot be met, so the demand for the high-strength corrugated base paper also depends on import. Therefore, it is necessary to develop an economic and reasonable production method of high-strength corrugated medium as soon as possible to improve the product quality of enterprises and meet the social production requirements.
Korean patent No. KR101232633 (B1) describes a method for improving the quality of a used paper corrugated box using precipitated calcium carbonate. The method comprises the steps of firstly introducing quicklime (CaO) into a reactor, adding water to prepare calcium hydroxide, then putting waste paper pulp into the reactor, fully stirring the calcium hydroxide and the waste paper pulp at a constant temperature to prepare a mixture, and producing the corrugated case by using the mixture, wherein the strength performance and the optical performance are both obviously improved, fiber resources are saved, the cost is reduced, but the plant fiber proportion is reduced due to the fact that a large amount of inorganic components are mixed in the corrugated case, and certain negative effects can be caused on fiber collection and recycling.
Japanese patent (JP 2004299779 (a)) provides a method for improving the strength of corrugated board by printing special inks. The printing ink contains a certain amount of synthetic resin, and the bonding force between fibers is improved by utilizing the bonding property of the resin, so that the strength of the paperboard is improved. The method separates the production process and the strength improvement process of the corrugated board, adopts special ink to print commercial advertisements (slogans) on the corrugated board, improves the strength of the corrugated board, and has simple operation and short process flow. However, the paper/board containing resin component is very difficult to disperse into fiber in the recycling process, and the removal of the resin component is also an essential step for recycling the waste paper/board, thereby causing the recycling process to be complicated and not being beneficial to environmental protection.
Chinese patent publication No. CN103806319A discloses a method for producing high-strength corrugated medium from waste paper. The method comprises the following specific steps: (1) pulping, screening, concentrating, medium-consistency grinding and acetylating domestic waste paper to obtain domestic waste paper pulp; (2) screening, purifying, concentrating and medium-consistency pulping the A-grade kraft liner tail pulp to obtain the treated A-grade kraft liner tail pulp; (3) uniformly mixing domestic waste paper pulp and A-grade kraft liner tail pulp to prepare mixed pulp; (4) the mixed slurry is subjected to pulp distribution through a papermaking front pool, a white water bucket, a fan pump, a pressure screen and a pulp flow box, is dewatered at a net part to form a wet paper web, and is subjected to squeezing, front drying, sizing and rear drying to produce a specification product. The method can fully utilize waste paper, changes waste into valuable, and has the advantages of low production cost, safe process and environmental protection. But the preparation of domestic waste paper pulp needs acetylation treatment, which increases the process complexity.
The Chinese patent with publication number CN104988790A discloses a method for preparing corrugated paper by using wheat straws and waste paper, which comprises the following steps: (1) straw pretreatment → softening → microbial decomposition → devillicate → jordaning → pulp sieving → obtaining straw pulp; (2) waste paper crushing → pulp purification and impurity removal → pulp concentration and curing and medium-consistency grinding → waste paper pulp is obtained; (3) mixing the wheat straw pulp and the waste paper pulp in proportion to make paper, and preparing the corrugated paper product. The invention utilizes agricultural wastes, namely wheat straws, to produce the corrugated paper, changes the history that the original high-strength corrugated paper can only use waste paper pulp and/or virgin stock, and reduces the production cost and the process pollution. However, the pretreatment of the wheat straw comprises a microbial treatment process, the raw materials need high-temperature sterilization, the treatment process needs a sterile environment, and the microbial treatment time is long, which brings certain difficulty to the actual production.
Chinese patent publication No. CN106256953A discloses a method for producing high-strength corrugated medium paper from OCC waste paper mixed with leather waste, which comprises processing leather waste into collagen fibers in the form of single fibers, pulping OCC waste paper to obtain OCC pulp, mixing the collagen fibers and OCC pulp in a certain proportion to form a mixed pulp, and making the mixed pulp into high-strength corrugated medium paper. The invention realizes the comprehensive utilization of resources, provides a brand new treatment method for the leather waste, has environment-friendly and clean production process and avoids environmental pollution. However, the collection, transportation and treatment of leather waste have certain difficulties, and the influence of the interwoven product of the collagen fibers and the plant fibers on the reuse of later-stage fibers is yet to be further researched, so that the large-scale popularization and application of the method are limited to a certain extent.
The invention patent of China with the publication number of CN101210403 introduces a method for improving the ring crush strength of full waste paper corrugated base paper, which comprises the steps of mixing phenol and diethylenetriamine, heating to 65-75 ℃, mixing with formaldehyde solution, reacting for 30min at high temperature (100-110 ℃), cooling to room temperature, and adjusting the pH value to 10.0-11.0 by using sodium hydroxide to prepare the reinforcing agent. On the premise of not changing the original production process of the full waste paper corrugated base paper, the strength performance of the corrugated base paper can be obviously improved by using the prepared reinforcing agent. The method can directly add the prepared reinforcing agent into paper pulp in the production process of the corrugated base paper, does not change the original production process flow, has simple addition form, and can improve the indexes of the paper such as ring crush strength, tensile index and the like. But the preparation process of the reinforcing agent is complex, which brings certain influence on the economical efficiency of the production cost and has certain application limitation.
In conclusion, the production of corrugated paper by using waste fibers is a good way for comprehensive utilization of biomass resources, and people pay attention to finding a method for improving the strength of corrugated paper, which is simple in operation, energy-saving, environment-friendly and excellent in effect. The invention takes the straw as the raw material, separates out the straw pith, and prepares the corrugated base paper by processing and proportioning with the waste paper pulp, thereby realizing the improvement of the strength of the corrugated paper.
Disclosure of Invention
The invention provides a method for preparing high-strength corrugated base paper by using straws and waste paper pulp, which adopts the technical scheme that:
a method for preparing high-strength corrugated base paper by using straws and waste paper pulp comprises the steps of drying straws, removing straw skins, separating straw pith, crushing straw marrow, mixing the straw pith powder with NaOH and/or KOH solution with the mass concentration of 1-10% until the mass concentration of the materials is 0.5-5%, soaking the materials, washing the materials until the materials are neutral, and adding water to obtain straw pith pulp, wherein the concentration of the straw pith is 0.5-5%;
adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 1-8%, or adding a hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 1-8%;
and stirring or oscillating the straw pulp, washing to be neutral, mixing with the waste paper pulp, wherein the mass fraction of the straw pulp in the mixed paper pulp is 10-30%, and making the corrugated base paper by using the mixed paper pulp.
The method comprises pulverizing straw marrow, and sieving with 20-mesh sieve to obtain straw marrow powder.
The method comprises soaking the materials at 20-50 deg.C for 2-10 hr, washing to neutrality, and adding water to obtain straw pulp.
The method comprises the steps of drying straws, removing straw skins, separating straw pith, crushing the straw pith, mixing the straw pith powder with NaOH and/or KOH solution with the mass concentration of 3-7% until the mass concentration of the materials is 0.5-5%, soaking the materials, washing the materials to be neutral, and adding water to obtain the straw pith slurry.
The method comprises the steps of adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 2-8%, or adding a hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 2-8%.
The method comprises the step of stirring or vibrating the straw pulp for 3-24 hours at the temperature of 25-60 ℃, wherein the stirring or vibrating speed is 20-200 rpm.
A high-strength corrugated base paper prepared from straws and waste paper pulp is prepared by the following steps: drying straws, removing straw skins, separating straw pith, crushing the straw pith, mixing the straw pith powder with NaOH and/or KOH solution with the mass concentration of 1-10% until the mass concentration of the materials is 0.5-5%, soaking the materials, washing the materials to be neutral, and adding water to obtain straw pith pulp, wherein the concentration of the straw pith is 0.5-5%;
adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 1-8%, or adding a hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 1-8%;
and stirring or oscillating the straw pulp, washing to be neutral, and mixing with the waste paper pulp to obtain mixed paper pulp, wherein the mass fraction of the straw pulp in the mixed paper pulp is 10-30%, and the corrugated base paper is made by using the mixed paper pulp.
In the preparation process of the corrugated base paper: drying straw, removing straw skin, separating straw marrow, crushing the straw marrow, mixing the straw marrow powder with NaOH and/or KOH solution with the mass concentration of 3-7% until the mass concentration of the material is 0.5-5%, soaking the material, washing the material to be neutral, and adding water to obtain the straw marrow pulp.
In the preparation process of the corrugated base paper: adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 2-8 percent or adding hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 2-8 percent.
In the preparation process of the corrugated base paper: stirring or shaking the straw pulp at 25-60 deg.C for 3-24 hr, wherein the stirring or shaking speed is 20-200 rpm.
The invention has the beneficial effects that:
the invention provides a method for preparing high-strength corrugated base paper by using straws and waste paper pulp, wherein the straws and the waste paper pulp are selected as raw materials, and the straw pulp which is not used by people in the straws is firstly crushed to reduce the size of the materials so as to facilitate the penetration of liquid medicine, and then is treated by alkali liquor to swell the materials, thereby being beneficial to the treatment of subsequent chemical reagents; the components such as lignin, extractives and the like in the straw pith are removed to a certain extent, the adverse effect on the quality of paper is avoided, the cell structure of the straw pith is damaged by using oxidizing agents such as peroxyacetic acid and the like, more hydroxyl groups are exposed on the surface of the straw pith, hydrogen bond connection is formed between the straw pith and fibers, the fiber bonding strength is improved, and the strength of the corrugated base paper is further improved;
therefore, the method not only has the advantages of rich raw materials, sufficient and guaranteed yield, low raw material cost, simple production process, short reaction time, less time consumption and low energy consumption, but also adds the straw pulp which is not utilized by people into the paper pulp, limits the proportion, further improves the strength of the corrugated base paper, realizes the high-efficiency recycling of secondary fiber, is beneficial to the resource utilization of agricultural wastes and is beneficial to energy conservation and consumption reduction.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a scanning electron microscope image of corrugated medium without straw pith;
fig. 3 is a scanning electron microscope image of the corrugated medium manufactured by the method of the present invention.
Detailed Description
The invention provides a method for preparing high-strength corrugated base paper by using straws and waste paper pulp, which comprises the steps of drying the straws, removing straw skins, separating straw piths, crushing the straw piths, mixing the straw pith powder with NaOH and/or KOH solution with the mass concentration of 1-10% until the mass concentration of the materials is 0.5-5%, soaking the materials, washing until the materials are neutral, and adding water to obtain straw pith pulp, wherein the concentration of the straw piths is 0.5-5%;
adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 1-8%, or adding a hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 1-8%;
and stirring or oscillating the straw pulp, washing to be neutral, mixing with the waste paper pulp, wherein the mass fraction of the straw pulp in the mixed paper pulp is 10-30%, and making the corrugated base paper by using the mixed paper pulp.
Meanwhile, the high-strength corrugated base paper prepared by using the straw and the waste paper pulp, which corresponds to the method, is prepared by the following method: drying straws, removing straw skins, separating straw pith, crushing the straw pith, mixing the straw pith powder with NaOH and/or KOH solution with the mass concentration of 1-10% until the mass concentration of the materials is 0.5-5%, soaking the materials, washing the materials to be neutral, and adding water to obtain straw pith pulp, wherein the concentration of the straw pith is 0.5-5%;
adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 1-8%, or adding a hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 1-8%;
and stirring or oscillating the straw pulp, washing to be neutral, and mixing with the waste paper pulp to obtain mixed paper pulp, wherein the mass fraction of the straw pulp in the mixed paper pulp is 10-30%, and the corrugated base paper is made by using the mixed paper pulp.
In specific implementation, crop straws such as wheat straws, cotton straws, corn straws and the like can be selected. As the materials are more convenient to obtain, the corn straws are selected in the example, and the invention is further explained by combining with the specific implementation.
Example 1:
the high-strength corrugated base paper is prepared by taking corn straws and waste paper pulp as raw materials. After corn straws are dried in the sun, the straw skins are removed, the straw pith is separated, the crushed straw pith is sieved by a 20-mesh sieve, the straw pith powder is immersed in 1% NaOH solution until the material concentration is 1%, the material is immersed for 4 hours at 20 ℃, then washed to be neutral, water is added to obtain straw pith pulp until the straw pith mass concentration is 2%, peracetic acid is added until the straw pith mass concentration is 3%, the mixture is stirred and treated for 3 hours at 25 ℃, the speed of a stirring rotor is 200rpm, the washing is neutral, the treated straw pith pulp is obtained, the straw pith pulp and waste paper pulp are mixed until the mass fraction of the straw pith in the mixed paper pulp is 10%, the mixed paper pulp is used for making corrugated base paper with the quantitative of 130g/m2, compared with corrugated base paper made from pure waste paper pulp under the same condition, the tensile strength of the paper is improved by 57% under normal temperature and normal pressure, and the ring.
Example 2:
the high-strength corrugated base paper is prepared by taking corn straws and waste paper pulp as raw materials. Air-drying corn straws, removing straw skins, separating straw pith, sieving the crushed straw pith with a 20-mesh sieve, soaking the straw pith powder in 5% KOH solution until the material concentration is 1.5%, soaking for 6 hours at 35 ℃, then washing to be neutral, adding water until the mass concentration of the straw pith is 1%, adding peroxyacetic acid until the concentration is 2%, oscillating for 6 hours at 35 ℃, rotating at 100rpm, washing to be neutral to obtain treated straw pith pulp, mixing the straw pith pulp with waste paper pulp until the mass fraction of the straw pith in the mixed paper pulp is 20%, preparing corrugated base paper with the quantitative content of 150g/m2 by using the mixed paper pulp, comparing the corrugated base paper with the corrugated base paper prepared by using pure waste paper pulp under the same condition, wherein the tensile strength of the paper is improved by 87% under normal temperature and normal pressure, and the ring crush strength is improved by 108%.
Example 3:
the high-strength corrugated base paper is prepared by taking corn straws and waste paper pulp as raw materials. Drying corn straws, removing straw skins, separating straw pith, crushing the straw pith, sieving by a 20-mesh sieve, immersing the straw pith powder in a mixed solution with the mass concentration of 3 percent of NaOH and KOH until the material concentration is 2.5 percent, immersing for 2 hours at 45 ℃, washing the straw pith to be neutral, adding water until the mass concentration of the straw pith is 2.5 percent, adding hydrochloric acid solution to adjust the pH value of the straw pith pulp to be less than 2, adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pith pulp is 6 percent, stirring and treating for 15 hours at 60 ℃, the speed of a stirring rotor is 20rpm, washing to be neutral to obtain the treated straw pith pulp, mixing the straw pith pulp with waste paper pulp until the mass fraction of the pith in the mixed paper pulp is 30 percent, making corrugated base paper with the mixed paper pulp with the mass of 160g/m2, comparing the corrugated base paper with corrugated base paper made of pure waste paper pulp under the same condition, and normal temperature and pressure, the tensile strength of the paper is improved by 167%, and the ring crush strength is improved by 205%.
Example 4:
the high-strength corrugated base paper is prepared by taking corn straws and waste paper pulp as raw materials. Air drying corn straw, removing straw skin, separating out straw pulp, crushing the straw pulp, sieving with a 20-mesh sieve, immersing the straw pulp powder in a 7% NaOH and KOH mixed solution until the material concentration is 4%, immersing at 40 ℃ for 8 hours, washing the straw pulp until the straw pulp is neutral, adding water until the mass concentration of the straw pulp is 3%, adding hydrochloric acid solution to adjust the pH value of the straw pulp to be below 2, adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 1%, oscillating at 50 ℃ for 12 hours at the rotating speed of 150rpm, washing until the straw pulp is neutral to obtain treated straw pulp, mixing the straw pulp with waste paper pulp until the mass fraction of the straw pulp in the mixed paper pulp is 25%, making corrugated base paper with the mixed paper pulp and the fixed amount of 100g/m2, comparing the paper with corrugated base paper made of pure paper pulp under the same condition, and improving the tensile strength of the paper by 117% at normal temperature and normal pressure, the ring crush strength is improved by 162 percent.
Example 5:
the high-strength corrugated base paper is prepared by taking corn straws and waste paper pulp as raw materials. Air-drying corn straws, removing straw skins, crushing separated straw pithes, sieving with a 20-mesh sieve, immersing the straw pith powder in a 10% NaOH solution until the material concentration is 5%, soaking at 50 ℃ for 10 hours, washing the treated straw pithes to be neutral, adding water until the mass concentration of the straw pithes is 5%, adding peroxyacetic acid until the concentration of the peroxyacetic acid is 8%, stirring and treating at 45 ℃ for 24 hours at the speed of a stirring rotor of 50rpm, washing to be neutral to obtain treated straw pith pulp, mixing the straw pith pulp with waste paper pulp until the mass fraction of the straw pithes in the mixed paper pulp is 25%, making corrugated base paper with the quantity of 200g/m2 by using the mixed paper pulp, wherein the tensile strength of the paper is improved by 95% and the ring crush strength is improved by 124% under normal temperature and normal pressure compared with corrugated base paper made of pure waste paper pulp under the same conditions.
In the above examples, the tensile strength was measured by a ZL-100A type tensile tester in accordance with GB/T453-1989; the ring crush strength was measured according to GB/T2679.8-1995 using a HSD-type A compression tester. Based on the above examples, in other specific implementations, the straw pulp powder is mixed with 3-7% alkali solution, peracetic acid is added to the straw pulp until the mass concentration of peracetic acid is 2-8%, or hydrochloric acid solution is added to the straw pulp to adjust the pH of the straw pulp to 2 or less, and then chlorine dioxide is added until the mass concentration of chlorine dioxide in the straw pulp is 2-6%, so that the tensile strength and ring crush strength of the paper are relatively improved.
And the scanning electron microscope image of the corrugated base paper manufactured by the method is compared with the scanning electron microscope image of the corrugated base paper without straw pulp, so that the fibers of the paper in the figure 2 can be seen to be mutually interwoven, but more and larger gaps are formed among the fibers, the fibers at the gaps are separated from the fibers, and the separated fibers cannot form hydrogen bonds and contribute to the bonding strength; the fibers of the paper in the figure 3 are mutually interwoven, and the straw pith is added to fill the gaps between the fibers, so that a bridging effect is generated between the fibers, the fibers are indirectly combined with each other, the bonding strength between the fibers is improved, and the strength performance of the paper is improved.
The numerical values not shown in the examples can be adjusted within the limits of the technical means of the present invention according to the actual circumstances, and are not described in detail.
Claims (10)
1. A method for preparing high-strength corrugated base paper by using straws and waste paper pulp is characterized in that straws are dried, straw skins are removed, straw pith is separated, the straw pith is crushed, the straw pith powder is mixed with NaOH and/or KOH solution with the mass concentration of 1-10% until the mass concentration of the materials is 0.5-5%, the materials are soaked and washed to be neutral, water is added to obtain straw pith pulp, wherein the concentration of the straw pith is 0.5-5%;
adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 1-8%, or adding a hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 1-8%;
and stirring or oscillating the straw pulp, washing to be neutral, mixing with the waste paper pulp, wherein the mass fraction of the straw pulp in the mixed paper pulp is 10-30%, and making the corrugated base paper by using the mixed paper pulp.
2. The method according to claim 1, wherein the straw marrow is pulverized and then passed through a 20-mesh sieve to obtain straw marrow powder.
3. The method as set forth in claim 1 or 2, wherein the material is soaked at 20-50 ℃ for 2-10 hours, washed to neutrality, and water is added to obtain straw pulp.
4. The method as claimed in claim 3, wherein the straw marrow is obtained by drying straw, removing bark, separating straw marrow, crushing straw marrow, mixing the straw marrow powder with NaOH and/or KOH solution with a mass concentration of 3-7% until the mass concentration of the material is 0.5-5%, soaking the material, washing the material until the material is neutral, and adding water to obtain straw marrow pulp.
5. The method as set forth in claim 1 or 4, wherein peracetic acid is added to the straw pulp until the mass concentration of peracetic acid is 2 to 8% or further hydrochloric acid solution is added to the straw pulp to adjust the pH of the straw pulp to 2 or less, and then chlorine dioxide is added until the mass concentration of chlorine dioxide in the straw pulp is 2 to 8%.
6. The method as claimed in claim 5, wherein the straw pulp is stirred or shaken at 25-60 ℃ for 3-24 hours, wherein the stirring or shaking speed is 20-200 rpm.
7. A high-strength corrugated base paper prepared from straw and waste paper pulp is characterized by being prepared by the following method: drying straws, removing straw skins, separating straw pith, crushing the straw pith, mixing the straw pith powder with NaOH and/or KOH solution with the mass concentration of 1-10% until the mass concentration of the materials is 0.5-5%, soaking the materials, washing the materials to be neutral, and adding water to obtain straw pith pulp, wherein the concentration of the straw pith is 0.5-5%;
adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 1-8%, or adding a hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 1-8%;
and stirring or oscillating the straw pulp, washing to be neutral, and mixing with the waste paper pulp to obtain mixed paper pulp, wherein the mass fraction of the straw pulp in the mixed paper pulp is 10-30%, and the corrugated base paper is made by using the mixed paper pulp.
8. The corrugated medium of claim 7, wherein in the preparation process: drying straw, removing straw skin, separating straw marrow, crushing the straw marrow, mixing the straw marrow powder with NaOH and/or KOH solution with the mass concentration of 3-7% until the mass concentration of the material is 0.5-5%, soaking the material, washing the material to be neutral, and adding water to obtain the straw marrow pulp.
9. The corrugating medium as claimed in claim 7 or 8, wherein in the preparation process: adding peroxyacetic acid into the straw pulp until the mass concentration of the peroxyacetic acid is 2-8 percent or adding hydrochloric acid solution into the straw pulp to adjust the pH value of the straw pulp to be below 2, and then adding chlorine dioxide until the mass concentration of the chlorine dioxide in the straw pulp is 2-8 percent.
10. The corrugated medium of claim 9, wherein in the preparation process: stirring or shaking the straw pulp at 25-60 deg.C for 3-24 hr, wherein the stirring or shaking speed is 20-200 rpm.
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| CN110618713A (en) * | 2019-08-19 | 2019-12-27 | 江苏星光新材料科技有限公司 | Temperature constant system in corrugated medium production process |
| CN112281530A (en) * | 2020-09-22 | 2021-01-29 | 黑龙江进化树生物科技有限公司 | Method for making paper by using straw biogas residues |
| CN113308925A (en) * | 2021-06-22 | 2021-08-27 | 江苏洋河集团包装材料有限公司 | Production process of environment-friendly corrugated carton for packaging white spirit |
| CN113969512B (en) * | 2021-11-19 | 2024-01-26 | 中国科学院宁波材料技术与工程研究所 | Full straw papermaking pulp and preparation method and application thereof |
| GB2616675B (en) * | 2022-03-18 | 2024-10-09 | Anheuser Busch Inbev Sa | Packaging from agricultural plant fibres |
| CN114921999B (en) * | 2022-05-19 | 2023-07-25 | 陕西科技大学 | Method for preparing filled paper by adding OCC paper pulp into wheat straw for recycling |
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