CN118345647B - Production process for recycling waste paper to regenerate high-strength corrugated base paper - Google Patents
Production process for recycling waste paper to regenerate high-strength corrugated base paper Download PDFInfo
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- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 24
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 17
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- 239000012752 auxiliary agent Substances 0.000 claims description 17
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- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 claims description 16
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- 229940048842 sodium xylenesulfonate Drugs 0.000 claims description 8
- QUCDWLYKDRVKMI-UHFFFAOYSA-M sodium;3,4-dimethylbenzenesulfonate Chemical compound [Na+].CC1=CC=C(S([O-])(=O)=O)C=C1C QUCDWLYKDRVKMI-UHFFFAOYSA-M 0.000 claims description 8
- 108010059892 Cellulase Proteins 0.000 claims description 7
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention belongs to the technical field of recycled waste paper processing, and particularly relates to a production process of waste paper recycling recycled high-strength corrugated base paper. The specific preparation process is as follows: s1, removing impurities from recycled waste paper, soaking, pulping, and performing enzymolysis to obtain pretreated pulp; s2, adding a surfactant into the pretreatment slurry obtained in the step S1, performing primary ultrasonic treatment, then adding a composite additive, and performing secondary ultrasonic treatment; s3, deslagging the paper pulp obtained in the step S2 through a deslagging device, then adding water for dilution, forming, squeezing and predrying; and S4, carrying out double-sided sizing and drying on the pre-dried corrugated base paper obtained in the step S3 by using a surface sizing chemical, and thus obtaining the corrugated base paper. The process provided by the invention effectively improves the strength and water resistance of the corrugated base paper under the high-humidity condition, ensures that the stability of the structure of the paper box can be maintained in the high-humidity environment, greatly reduces the risks of softening, expanding and even cracking caused by water absorption, and ensures the safety and the integrity of packaged articles.
Description
Technical Field
The invention belongs to the technical field of recycled waste paper processing, and particularly relates to a production process of waste paper recycling recycled high-strength corrugated base paper.
Background
Corrugated base paper is an important component in the production of corrugated board, and is a specially designed and treated paper used to form the corrugated core layer in the corrugated board structure. The corrugated base paper has good fiber bonding strength, flatness, tightness and stiffness and certain elasticity, and ensures that the manufactured corrugated paper box has good shockproof and pressure-resistant capabilities. The main components of the material comprise wood pulp, waste paper pulp or other fiber raw materials, and chemical auxiliary agents such as wet strength agent, retention aid, softener and the like are added to optimize the performance.
The corrugated base paper is mainly used for producing various types of corrugated boards, and the boards are subjected to subsequent processing such as printing, cutting and the like, so that the corrugated base paper can be used in various fields such as food packaging, commodity retail packaging, shockproof packaging and the like. Because of its excellent structural properties, the position of corrugated base paper in the packaging industry is very important, especially in the fields of food and beverage, daily chemicals, electronic products and the like.
However, existing corrugated base paper, while possessing some strength, may still be significantly inadequate in certain heavy packaging applications. And the strength of the packaging material is affected by being easily wetted in a natural environment, and the strength of the packaging material is obviously reduced in a high-humidity environment or in long-time soaking, so that the stability and the bearing capacity of the packaging material are seriously affected. The traditional corrugated base paper production depends on a large amount of wood and water resources, waste water and waste materials can be generated in the production process, the natural resources can be greatly lost, and the ecological environment is deeply adversely affected.
Accordingly, there is a need to provide a method for producing corrugated medium with high strength and low water absorption from waste paper.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a production process for recycling waste paper to regenerate high-strength corrugated base paper. The process provided by the invention effectively improves the strength and water resistance of the corrugated base paper under the high-humidity condition, ensures that the stability of the structure of the paper box can be maintained in the high-humidity environment, greatly reduces the risks of softening, expanding and even cracking caused by water absorption, and ensures the safety and the integrity of packaged articles.
The technical scheme of the invention is as follows:
a production process for recycling waste paper to regenerate high-strength corrugated base paper comprises the following preparation steps:
S1, removing impurities from recycled waste paper, soaking the waste paper in water, adjusting the concentration of the slurry, treating the waste paper by a high-concentration hydraulic pulper, adding biological enzyme, adjusting the pH value, and performing enzymolysis to obtain pretreated slurry;
s2, adding a surfactant into the pretreatment slurry obtained in the step S1, performing primary ultrasonic treatment, then adding a composite auxiliary agent, uniformly stirring, and performing secondary ultrasonic treatment;
s3, deslagging the paper pulp obtained in the step S2 through a deslagging device, then adding water for dilution, papermaking, forming, squeezing and pre-drying to obtain pre-dried corrugated base paper;
And S4, carrying out double-sided sizing and drying on the pre-dried corrugated base paper obtained in the step S3 by using a surface sizing chemical, and thus obtaining the corrugated base paper.
Further, the recycled waste paper in the step S1 is a national waste box board.
Further, the surface sizing chemical in the step S4 consists of the following components in parts by weight: 25-35 parts of grafted butyl acrylate starch, 7-10 parts of guar gum, 3-5 parts of nano calcium carbonate, 8-10 parts of polyvinyl alcohol and 150-200 parts of water.
Further, the preparation method of the grafted butyl acrylate starch comprises the following steps:
Adding distilled water with the mass of 4-6 times of that of the corn starch into the corn starch, uniformly mixing, heating to 85-95 ℃, and continuously stirring until the corn starch is dissolved to form uniform starch paste; adding butyl acrylate, ammonium persulfate and N, N-dimethylformamide into the starch paste, and fully and uniformly mixing; then placing the mixture into a constant-temperature water bath, and reacting for 4-6 hours under the conditions that the temperature is 60-70 ℃ and the stirring speed is 80-100 r/min; and (3) after the reaction is finished, cleaning the product by deionized water, and then centrifuging and drying to obtain the product.
Further, the dosage of the butyl acrylate is 22-26% of the mass of the corn starch, the dosage of the ammonium persulfate is 1.2-1.6% of the mass of the corn starch, and the dosage of the N, N-dimethylformamide is 7-12% of the mass of the corn starch.
Further, the dosage of the butyl acrylate is 24% of the mass of the corn starch, the dosage of the ammonium persulfate is 1.5% of the mass of the corn starch, and the dosage of the N, N-dimethylformamide is 10% of the mass of the corn starch.
Further, in the step S1, the waste paper after the impurity removal is soaked in water for 5 to 8 hours, the concentration of the slurry is adjusted to 10 to 15 percent, and the treatment time in the high-concentration hydraulic pulper is 20 to 30 minutes.
Further, the biological enzyme in the step S1 is a combination of cellulase, xylanase and alpha-amylase; the biological enzyme consists of cellulase, xylanase and alpha-amylase according to the weight ratio of 1:1:2-3.
Further, the addition amount of the biological enzyme in the step S1 is 0.2-0.3% of the absolute dry weight of the paper pulp, the enzymolysis temperature is 42-50 ℃, the enzymolysis time is 4-6 h, the pH is regulated to 6.5-7.5, and the stirring speed in the enzymolysis process is 200-300 r/min.
Further, the addition amount of the surfactant in the step S2 is 0.3-0.7% of the weight of the pretreated slurry obtained in the step S1; the surfactant consists of sodium xylene sulfonate and 1, 3-propylene glycol according to the weight ratio of 2-4:1.
Further, the addition amount of the surfactant in the step S2 is 0.5% of the weight of the pretreated slurry obtained in the step S1; the surfactant consists of sodium xylene sulfonate and 1, 3-propylene glycol according to a weight ratio of 3:1.
Further, the composite auxiliary agent in the step S2 is two or more than two of polyacrylamide, polyethyleneimine, alkyl ketene dimer, carboxymethyl starch and carboxymethyl cellulose; the addition amount of the composite auxiliary agent is 0.3-0.5% of the weight of the pretreated slurry in the step S1.
Further, the frequency of the primary ultrasonic treatment in the step S2 is 60-80 kHz, the ultrasonic time is 20-30 min, the frequency of the secondary ultrasonic treatment is 30-50 kHz, and the ultrasonic time is 30-40 min.
Further, the preparation method of the surface sizing chemical in the step S4 comprises the following preparation steps:
And (3) dissolving the grafted butyl acrylate starch in water, uniformly stirring, adding polyvinyl alcohol, guar gum and nano calcium carbonate while stirring, stirring for 1-2h, and then standing for 2-3 h to obtain the modified butyl acrylate starch.
Further, in the step S3, the deslagged paper pulp precipitation is diluted to the pulp concentration of 0.8-1.5%; the sizing amount in the step S4 is 8g/m 2, the drying temperature is 105-110 ℃, the water content of the dried corrugated base paper is 7.5wt%, and the ration is 110-165 g/m 2.
The corrugated base paper prepared by the preparation process has strong adaptability to high-humidity environment, and fundamentally overcomes the difficult problems in the traditional production process. The problems of reduced strength performance and reduced water resistance of the high-strength corrugated base paper under the high-temperature and high-humidity conditions in summer are solved. The preparation process of the high-strength corrugated base paper adopts different reasonable proportions of raw materials, firstly adopts specific composite biological enzyme to carry out enzymolysis on the recovered waste paper in the pulping process, and carries out moderate modification on the fibers, thereby promoting the separation of ink particles among the fibers and the fluffing of the fibers, improving the swelling property of the fibers, improving the swelling degree and interweaving degree of the fibers, promoting the effective combination of surface sizing chemicals and the fibers in the subsequent steps, and further strengthening the water resistance and mechanical strength of the paper in a molecular level.
Further, adding a surfactant consisting of sodium xylene sulfonate and 1, 3-propylene glycol according to a weight ratio of 2-4:1 into the pretreated pulp after enzymolysis, performing primary ultrasonic treatment, then adding a composite auxiliary agent to perform secondary ultrasonic treatment, combining the synergistic effect of the surfactant and the composite auxiliary agent (two or more of polyacrylamide, polyethyleneimine, alkyl ketene dimer, carboxymethyl starch and carboxymethyl cellulose), and performing treatment by adopting a sectional ultrasonic treatment process, so that fibers and the composite auxiliary agent can be dispersed more uniformly in water, flocculation is reduced, and uniformity and fluidity of the pulp are improved. At the same time, the loss of fibers can be reduced, and the strength and uniformity of the paper can be improved, so that the uniformity of subsequent sizing and coating operations is improved, and the surface sizing chemicals can be more uniformly distributed on the paper sheet by adjusting the surface tension of the paper pulp.
Finally, the invention adopts the prepared specific surface sizing chemical, can form a compact protective layer on the surface of paper, effectively prevent moisture penetration, enhance the moistureproof and liquid penetration resistance of the paperboard, obviously reduce the moisture absorption expansion of the corrugated base paper even in a high humidity environment, maintain the structural stability and strength of the carton and effectively improve the ring crush strength of the corrugated base paper.
Compared with the prior art, the production process of the waste paper recycling high-strength corrugated base paper provided by the invention has the following advantages:
The invention provides a production process of waste paper recycling regenerated high-strength corrugated base paper, which is characterized in that different raw materials are reasonably proportioned, and the high-efficiency wet end chemicals, surface sizing chemicals, biological enzyme products and the like are combined to be applied to the production of the high-strength corrugated base paper, so that the strength and water resistance of the corrugated base paper under the high-humidity condition are effectively improved through the high-efficiency synergistic effect, and the problems that high-strength corrugated base paper manufacturers and carton manufacturers puzzle about the high-temperature and high-humidity environment for many years, the strength of the high-strength corrugated base paper is reduced, the water resistance is poor, and the packing box is broken or collapsed are solved.
Detailed Description
The invention is further illustrated by the following description of specific embodiments, which are not intended to be limiting, and various modifications or improvements can be made by those skilled in the art in light of the basic idea of the invention, but are within the scope of the invention as long as they do not depart from the basic idea of the invention.
In the following examples and comparative examples, the reagents not specifically described were conventional reagents, which were purchased at conventional reagent manufacturing and sales companies, and the methods used, if not specifically described, were all prior art, and some of the raw material manufacturers were as follows:
Cellulase, CAS number: 9012-54-8, product number: s10041; xylanase, CAS number: 9025-57-4, cat No.: s10108; alpha-amylase, CAS number: 9025-57-4, cat No.: s10108; polyacrylamide (PAM), CAS number: 9003-05-8, cat#: s31321; carboxymethyl cellulose, CAS number: 9000-11-7, cat#: s14019, guar, CAS number: 9000-30-0, cat#: s30550, all purchased from Shanghai Seiyaka Biotechnology Co., ltd;
Polyethyleneimine, CAS number: 9002-98-6, purchased from Shandong sea boat bioengineering Co., ltd;
Alkyl Ketene Dimer (AKD), CAS number: 144245-85-2, available from Hubei Xinming tai chemical Co., ltd;
carboxymethyl starch, CAS number: 9057-06-1, available from zhengzhou dragon biochemicals products, inc;
Polyvinyl alcohol, CAS number: 9002-89-5, purchased from Shandong Xin Heng chemical Co., ltd;
Nano calcium carbonate, CAS no: 471-34-1, available from Shanghai Michelson Biochemical technologies Co., ltd, under the product number M81760;
Acrylic grafted starch was purchased from Hubei Maid chemical Co.
Example 1
A production process for recycling waste paper to regenerate high-strength corrugated base paper comprises the following preparation steps:
S1, removing impurities from 2Kg of national waste box boards, soaking the waste box boards in water for 5 hours, adjusting the concentration of the slurry to 10%, then treating the slurry for 20 minutes by a high-concentration hydraulic pulper, then adding biological enzyme consisting of cellulase, xylanase and alpha-amylase according to the weight ratio of 1:1:2, wherein the addition amount of the biological enzyme is 0.2% of the absolute dry weight of paper pulp, adjusting the pH value to 6.5, and carrying out enzymolysis for 6 hours under the conditions that the temperature is 42 ℃ and the stirring speed is 200r/min to obtain pretreated slurry;
s2, adding a surfactant consisting of sodium xylene sulfonate and 1, 3-propylene glycol according to a weight ratio of 2:1 into the pretreatment slurry obtained in the step S1 (the addition amount of the surfactant is 0.3 percent of the weight of the pretreatment slurry obtained in the step S1), performing primary ultrasonic treatment, wherein the frequency of the ultrasonic treatment is 60kHz, the ultrasonic time is 30 minutes, then adding a composite auxiliary agent consisting of polyacrylamide and alkyl ketene dimer according to a weight ratio of 1:3 (the addition amount of the composite auxiliary agent is 0.3 percent of the weight of the pretreatment slurry obtained in the step S1), uniformly stirring, and performing secondary ultrasonic treatment; the frequency of the secondary ultrasonic wave is 30kHz, and the ultrasonic wave time is 40min;
S3, deslagging the paper pulp obtained in the step S2 through a deslagging device, adding water to dilute the paper pulp until the concentration of the paper pulp is 0.8%, carrying out papermaking forming, squeezing, and drying until the water content is less than or equal to 10wt% to obtain pre-dried corrugated base paper;
S4, double-sided sizing is carried out on the pre-dried corrugated base paper obtained in the step S3 by using a surface sizing chemical, the sizing amount is 8g/m 2, the drying is carried out until the water content is 7.5wt%, and the quantitative 130g/m 2 is obtained.
The preparation method of the surface sizing chemical in the step S4 comprises the following steps: dissolving 25g of grafted butyl acrylate starch in 150g of water, uniformly stirring, adding 8g of polyvinyl alcohol, 7g of guar gum and 3g of nano calcium carbonate while stirring, stirring for 1h, and standing for 2h to obtain the modified butyl acrylate.
The preparation method of the grafted butyl acrylate starch comprises the following steps:
Adding 800g of distilled water into 200g of corn starch, uniformly mixing, heating to 85 ℃, and continuously stirring until the starch is dissolved to form uniform starch paste; 44g of butyl acrylate, 2.4g of ammonium persulfate and 14g of N, N-dimethylformamide are added into the starch paste and are fully and uniformly mixed; then the mixture is placed in a constant temperature water bath, and reacts for 6 hours under the conditions that the temperature is 60 ℃ and the stirring speed is 80 r/min; and (3) after the reaction is finished, cleaning the product by deionized water, and then centrifuging and drying to obtain the product.
Example 2
A production process for recycling waste paper to regenerate high-strength corrugated base paper comprises the following preparation steps:
S1, removing impurities from 2Kg of national waste box boards, soaking the waste box boards in water for 6 hours, adjusting the concentration of the slurry to 12%, then treating the slurry for 25 minutes by a high-concentration hydraulic pulper, then adding biological enzyme consisting of cellulase, xylanase and alpha-amylase according to the weight ratio of 1:1:2.5, wherein the addition amount of the biological enzyme is 0.25% of the absolute dry weight of paper pulp, adjusting the pH value to 7.0, and carrying out enzymolysis for 5 hours at the temperature of 45 ℃ and the stirring speed of 250r/min to obtain pretreated slurry;
S2, adding a surfactant which consists of sodium xylene sulfonate and 1, 3-propylene glycol according to a weight ratio of 3:1 into the pretreatment slurry obtained in the step S1 (the addition amount of the surfactant is 0.5 percent of the weight of the pretreatment slurry obtained in the step S1), performing primary ultrasonic treatment, wherein the frequency of the ultrasonic treatment is 70kHz, the ultrasonic time is 25 minutes, and then adding a composite auxiliary agent which consists of polyacrylamide, alkyl ketene dimer and carboxymethyl starch according to a weight ratio of 1:2:1 (the addition amount of the composite auxiliary agent is 0.4 percent of the weight of the pretreatment slurry obtained in the step S1), uniformly stirring, and performing secondary ultrasonic treatment; the frequency of the secondary ultrasonic wave is 40kHz, and the ultrasonic time is 35min;
s3, deslagging the paper pulp obtained in the step S2 through a deslagging device, then adding water to dilute the paper pulp until the concentration of the paper pulp is 1.2%, forming, squeezing, and drying until the water content is less than or equal to 10wt% to obtain pre-dried corrugated base paper;
S4, double-sided sizing is carried out on the pre-dried corrugated base paper obtained in the step S3 by using a surface sizing chemical, the sizing amount is 8g/m 2, the drying is carried out until the water content is 7.5wt%, and the quantitative amount is 140g/m 2, thus obtaining the corrugated base paper.
The preparation method of the surface sizing chemical in the step S4 comprises the following steps: dissolving 20g of grafted butyl acrylate starch in 180g of water, uniformly stirring, adding 9g of polyvinyl alcohol, 8g of guar gum and 4g of nano calcium carbonate while stirring, stirring for 1.5h, and standing for 2.5h to obtain the modified butyl acrylate.
The preparation method of the grafted butyl acrylate starch comprises the following steps:
Adding 1000g of distilled water into 200g of corn starch, uniformly mixing, heating to 90 ℃, and continuously stirring until the starch is dissolved to form uniform starch paste; 48g of butyl acrylate, 3g of ammonium persulfate and 20g of N, N-dimethylformamide are added into the starch paste and are fully and uniformly mixed; then the mixture is placed in a constant temperature water bath, and reacts for 5 hours under the conditions that the temperature is 65 ℃ and the stirring speed is 90 r/min; and (3) after the reaction is finished, cleaning the product by deionized water, and then centrifuging and drying to obtain the product.
Example 3
A production process for recycling waste paper to regenerate high-strength corrugated base paper comprises the following preparation steps:
S1, removing impurities from 2Kg of national waste box boards, soaking the waste box boards in water for 8 hours, adjusting the concentration of the slurry to 15%, then treating the slurry for 30 minutes by a high-concentration hydraulic pulper, then adding biological enzyme consisting of cellulase, xylanase and alpha-amylase according to the weight ratio of 1:1:3, wherein the addition amount of the biological enzyme is 0.3% of the absolute dry weight of paper pulp, adjusting the pH value to 7.5, and carrying out enzymolysis for 4 hours at the temperature of 50 ℃ and the stirring speed of 300r/min to obtain pretreated slurry;
S2, adding a surfactant which consists of sodium xylene sulfonate and 1, 3-propylene glycol according to a weight ratio of 4:1 into the pretreatment slurry obtained in the step S1 (the addition amount of the surfactant is 0.7% of the weight of the pretreatment slurry obtained in the step S1), performing primary ultrasonic treatment, wherein the frequency of the ultrasonic treatment is 80kHz, the ultrasonic time is 20 minutes, and then adding a composite auxiliary agent which consists of polyacrylamide, polyethyleneimine, alkyl ketene dimer and carboxymethyl cellulose according to a weight ratio of 1:1:1:1 (the addition amount of the composite auxiliary agent is 0.5% of the weight of the pretreatment slurry obtained in the step S1), uniformly stirring, and performing secondary ultrasonic treatment; the frequency of the secondary ultrasonic wave is 50kHz, and the ultrasonic wave time is 30min;
s3, deslagging the paper pulp obtained in the step S2 through a slag remover, then adding water to dilute the paper pulp until the concentration of the paper pulp is 1.5%, forming, squeezing, and drying until the water content is less than or equal to 10wt%, so as to obtain pre-dried corrugated base paper;
S4, double-sided sizing is carried out on the pre-dried corrugated base paper obtained in the step S3 by using a surface sizing chemical, the sizing amount is 8g/m 2, the drying is carried out until the water content is 7.5wt%, and the quantitative 165g/m 2 is obtained.
The preparation method of the surface sizing chemical in the step S4 comprises the following steps: and (3) dissolving 35g of grafted butyl acrylate starch in 200g of water, uniformly stirring, adding 10g of polyvinyl alcohol, 10g of guar gum and 5g of nano calcium carbonate while stirring, stirring for 2h, and standing for 3h to obtain the modified butyl acrylate.
The preparation method of the grafted butyl acrylate starch comprises the following steps:
Adding distilled water with the mass of 1200g into 200g of corn starch, uniformly mixing, heating to 95 ℃, and continuously stirring until the dissolution is completed to form uniform starch paste; 52g of butyl acrylate, 3.2g of ammonium persulfate and 24g of N, N-dimethylformamide are added into the starch paste and are fully and uniformly mixed; then the mixture is placed in a constant temperature water bath, and reacts for 4 hours under the conditions that the temperature is 70 ℃ and the stirring speed is 100 r/min; and (3) after the reaction is finished, cleaning the product by deionized water, and then centrifuging and drying to obtain the product.
Comparative example 1
In comparison with example 2, comparative example 1 differs in that the xylene sulfonic acid in the surfactant of step S2 is replaced with sodium dodecylbenzenesulfonate, and other production processes and parameters are the same as in example 2.
Comparative example 2
Comparative example 2 differs from example 2 in that the ultrasonic treatment was performed only once in step S2. Namely, the specific process of the step S2 is as follows: adding a surfactant consisting of sodium xylene sulfonate and 1, 3-propylene glycol according to a weight ratio of 2:1 into the pretreatment slurry obtained in the step S1 (the addition amount of the surfactant is 0.3 percent of the weight of the pretreatment slurry obtained in the step S1), then adding a composite auxiliary agent consisting of polyacrylamide and alkyl ketene dimer according to a weight ratio of 1:3 (the addition amount of the composite auxiliary agent is 0.3 percent of the weight of the pretreatment slurry obtained in the step S1), uniformly stirring, and carrying out ultrasonic treatment, wherein the ultrasonic frequency is 70kHz, and the ultrasonic time is 1h.
Other production processes and parameters were the same as in example 2.
Comparative example 3
In comparison with example 2, comparative example 3 differs in that the grafted butyl acrylate starch in the surface sizing chemical of step S4 is replaced by a commercially available acrylic acid grafted starch, and other production processes and parameters are the same as in example 2.
Comparative example 4
Compared with example 2, the difference of comparative example 4 is that guar gum is not added in step S4, the amount of grafted butyl acrylate starch is correspondingly increased to 28g, and other production processes and parameters are the same as example 2.
Test example one, corrugated base paper performance detection made by the invention
1. Test object: corrugated base papers prepared in examples 1 to 3 and comparative examples 1 to 4 according to the present invention.
2. The test method comprises the following steps:
(1) Examples 1 to 3 were examined according to the methods described in GB 13023-1991 Standard for corrugated base, and the corrugated base produced in comparative examples 1 to 4 was quantified (g/m 2) and the transverse Ring pressure index (N.m/g).
(2) The absorbent capacities (g/m 2) of the corrugated base papers produced in examples 1 to 3 and comparative examples 1 to 4 were examined according to the methods described in GB/T1540-2002 method for measuring absorbency of paper and paperboard.
The test results are shown in Table 1.
TABLE 1
| Group of | Quantification (g/m 2) | Transverse ring crush index (N.m/g) | Water absorption value (g/m 2) |
| Example 1 | 130 | 8.9 | 23.4 |
| Example 2 | 140 | 9.2 | 21.6 |
| Example 3 | 165 | 9.6 | 21.2 |
| Comparative example 1 | 140 | 7.1 | 24.6 |
| Comparative example 2 | 140 | 6.8 | 27.2 |
| Comparative example 3 | 140 | 7.7 | 35.3 |
| Comparative example 4 | 140 | 8.1 | 33.7 |
As can be seen from Table 1, the high-strength corrugated base paper prepared by adopting the embodiments 1-3 of the invention has high ring crush strength when the ration is 130-165 g/m 2, the transverse ring crush index is 8.9-9.6 N.m/g, the water absorption values are all less than 24g/m 2, the whole performance is excellent, the prepared corrugated board is not easy to deform and crack when being stressed, the water absorption value is low, the softening or the strength reduction of the prepared corrugated board in a high-humidity environment can be prevented, and the structural integrity of the package can be maintained.
In comparative examples 1 to 4, when the raw materials and the preparation parameters in the preparation process of the present invention were changed, the ring pressure intensity of the corrugated medium was decreased, the water absorption value was increased, and the overall properties were decreased to different extents.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (6)
1. The production process of the waste paper recycling high-strength corrugated base paper is characterized by comprising the following preparation steps:
S1, removing impurities from recycled waste paper, soaking the waste paper in water, adjusting the concentration of the slurry, treating the waste paper by a high-concentration hydraulic pulper, adding biological enzyme, adjusting the pH value, and performing enzymolysis to obtain pretreated slurry;
s2, adding a surfactant into the pretreatment slurry obtained in the step S1, performing primary ultrasonic treatment, then adding a composite auxiliary agent, uniformly stirring, and performing secondary ultrasonic treatment;
s3, deslagging the paper pulp obtained in the step S2 through a deslagging device, then adding water for dilution, papermaking, forming, squeezing and pre-drying to obtain pre-dried corrugated base paper;
s4, carrying out double-sided sizing on the pre-dried corrugated base paper obtained in the step S3 by using a surface sizing chemical, and drying to obtain the corrugated base paper;
The surface sizing chemical in the step S4 consists of the following components in parts by weight: 25-35 parts of grafted butyl acrylate starch, 7-10 parts of guar gum, 3-5 parts of nano calcium carbonate, 8-10 parts of polyvinyl alcohol and 150-200 parts of water;
the preparation method of the grafted butyl acrylate starch comprises the following steps:
adding distilled water with the mass of 4-6 times of that of the corn starch, uniformly mixing, heating to 85-95 ℃, and continuously stirring until the corn starch is dissolved to form uniform starch paste; adding butyl acrylate, ammonium persulfate and N, N-dimethylformamide into the starch paste, and fully and uniformly mixing; then placing the mixture in a constant-temperature water bath, and reacting for 4-6 hours under the conditions that the temperature is 60-70 ℃ and the stirring speed is 80-100 r/min; washing the product with deionized water after the reaction is completed, and then centrifuging and drying to obtain the product;
The dosage of the butyl acrylate is 22-26% of the mass of the corn starch, the additive amount of the ammonium persulfate is 1.2-1.6% of the mass of the corn starch, and the additive amount of the N, N-dimethylformamide is 7-12% of the mass of the corn starch;
the biological enzyme in the step S1 is a combination of cellulase, xylanase and alpha-amylase; the addition amount of the biological enzyme in the step S1 is 0.2-0.3% of the absolute dry weight of paper pulp, the enzymolysis temperature is 42-50 ℃, the enzymolysis time is 4-6 h, the pH is regulated to 6.5-7.5, and the stirring speed in the enzymolysis process is 200-300 r/min;
The surfactant in the step S2 consists of sodium xylene sulfonate and 1, 3-propylene glycol according to a weight ratio of 2-4:1;
The composite auxiliary agent in the step S2 is two or more than two of polyacrylamide, polyethyleneimine, alkyl ketene dimer, carboxymethyl starch and carboxymethyl cellulose;
The frequency of the primary ultrasonic treatment in the step S2 is 60-80 kHz, the ultrasonic time is 20-30 min, the frequency of the secondary ultrasonic treatment is 30-50 kHz, and the ultrasonic time is 30-40 min.
2. The process for producing the recycled high-strength corrugated base paper by using the waste paper according to claim 1, wherein in the step S1, the waste paper subjected to impurity removal is soaked in water for 5-8 hours, the concentration of the pulp is adjusted to 10-15%, and the treatment time in a high-concentration hydraulic pulper is 20-30 min.
3. The process for producing high-strength corrugated medium by recycling waste paper according to claim 1, wherein the addition amount of the surfactant in the step S2 is 0.3-0.7% of the weight of the pretreated pulp obtained in the step S1.
4. The process for producing high-strength corrugated medium by recycling waste paper according to claim 1, wherein the addition amount of the composite additive is 0.3-0.5% of the weight of the pretreatment pulp in the step S1.
5. The process for producing recycled high-strength corrugated medium from waste paper according to claim 1, wherein the process for preparing the surface sizing chemical in step S4 comprises the following steps:
and dissolving the grafted butyl acrylate starch in water, uniformly stirring, adding polyvinyl alcohol, guar gum and nano calcium carbonate while stirring, stirring for 1-2 h, and then standing for 2-3 h to obtain the modified butyl acrylate starch.
6. The process for producing the waste paper recycling regenerated high-strength corrugated medium according to claim 1, wherein in the step S3, the deslagged pulp precipitation is diluted to a pulp concentration of 0.8-1.5%; the sizing amount in the step S4 is 8 g/m 2, the drying temperature is 105-110 ℃, and the water content of the dried corrugated base paper is 7.5 wt%.
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