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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- CN118345647B CN118345647B CN202410623436.XA CN202410623436A CN118345647B CN 118345647 B CN118345647 B CN 118345647B CN 202410623436 A CN202410623436 A CN 202410623436A CN 118345647 B CN118345647 B CN 118345647B
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- 239000010893 paper waste Substances 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000004064 recycling Methods 0.000 title claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000004513 sizing Methods 0.000 claims abstract description 30
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 24
- 238000002360 preparation method Methods 0.000 claims abstract description 22
- 239000000126 substance Substances 0.000 claims abstract description 21
- 239000004094 surface-active agent Substances 0.000 claims abstract description 20
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 19
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 36
- 229920002472 Starch Polymers 0.000 claims description 35
- 239000008107 starch Substances 0.000 claims description 35
- 235000019698 starch Nutrition 0.000 claims description 35
- 239000002002 slurry Substances 0.000 claims description 29
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 26
- 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
- 229920002261 Corn starch Polymers 0.000 claims description 16
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000008120 corn starch Substances 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 16
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 claims description 16
- 108090000790 Enzymes Proteins 0.000 claims description 15
- 102000004190 Enzymes Human genes 0.000 claims description 15
- 229940088598 enzyme Drugs 0.000 claims description 15
- 229920002401 polyacrylamide Polymers 0.000 claims description 9
- 229920002907 Guar gum Polymers 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- -1 alkyl ketene dimer Chemical compound 0.000 claims description 8
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- 239000000665 guar gum Substances 0.000 claims description 8
- 229960002154 guar gum Drugs 0.000 claims description 8
- 235000010417 guar gum Nutrition 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- 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
- 101710121765 Endo-1,4-beta-xylanase Proteins 0.000 claims description 7
- 102000004139 alpha-Amylases Human genes 0.000 claims description 7
- 108090000637 alpha-Amylases Proteins 0.000 claims description 7
- 229940024171 alpha-amylase Drugs 0.000 claims description 7
- 229940106157 cellulase Drugs 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 5
- 229920002873 Polyethylenimine Polymers 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 5
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 5
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 230000007071 enzymatic hydrolysis Effects 0.000 claims 3
- 238000006047 enzymatic hydrolysis reaction Methods 0.000 claims 3
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 239000002893 slag Substances 0.000 abstract description 3
- 230000008961 swelling Effects 0.000 abstract description 2
- 239000000123 paper Substances 0.000 description 49
- 229920001131 Pulp (paper) Polymers 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 17
- 239000000835 fiber Substances 0.000 description 10
- 239000011087 paperboard Substances 0.000 description 9
- 239000002699 waste material Substances 0.000 description 8
- 241000274582 Pycnanthus angolensis Species 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000002791 soaking Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- JIRHAGAOHOYLNO-UHFFFAOYSA-N (3-cyclopentyloxy-4-methoxyphenyl)methanol Chemical compound COC1=CC=C(CO)C=C1OC1CCCC1 JIRHAGAOHOYLNO-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
-
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- 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
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Paper (AREA)
Abstract
本发明属于再生废纸加工技术领域，具体涉及一种废纸循环再生高强瓦楞原纸的生产工艺。具体制备工艺如下：S1、回收废纸除杂，浸泡，碎浆，酶解，得预处理浆；S2、向步骤S1所得的预处理浆中加入表面活性剂，一次超声处理，然后加入复合助剂，二次超声处理；S3、向步骤S2所得的纸浆经过除渣器除渣，接着加水稀释，抄造成型，压榨，预干燥；S4、用表面施胶化学品对步骤S3所得的预烘干的瓦楞原纸进行双面施胶，烘干，即得。采用本发明提供的工艺有效提高了瓦楞原纸在高湿条件下的强度及抗水性，保证纸箱在高湿环境中依然能够保持结构的稳固性，大大降低了因吸水导致的软化、膨胀乃至破裂的风险，保障了包装物品的安全和完整性。The present invention belongs to the technical field of recycled waste paper processing, and specifically relates to a production process for high-strength corrugated base paper recycled from waste paper. The specific preparation process is as follows: S1, remove impurities from recycled waste paper, soak, pulp, and enzymolysis to obtain pretreated pulp; S2, add a surfactant to the pretreated pulp obtained in step S1, perform an ultrasonic treatment once, then add a composite auxiliary agent, and perform a second ultrasonic treatment; S3, remove slag from the pulp obtained in step S2 through a slag remover, then dilute with water, sheet form, press, and pre-dry; S4, double-side sizing the pre-dried corrugated base paper obtained in step S3 with surface sizing chemicals, and dry to obtain. The process provided by the present invention effectively improves the strength and water resistance of corrugated base paper under high humidity conditions, ensures that the carton can still maintain the stability of the structure in a high humidity environment, greatly reduces the risk of softening, swelling, and even rupture due to water absorption, and ensures the safety and integrity of the packaged items.
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.
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