CN115491927A - High-strength copy paper and production method thereof - Google Patents
High-strength copy paper and production method thereof Download PDFInfo
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- CN115491927A CN115491927A CN202211187507.3A CN202211187507A CN115491927A CN 115491927 A CN115491927 A CN 115491927A CN 202211187507 A CN202211187507 A CN 202211187507A CN 115491927 A CN115491927 A CN 115491927A
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- Prior art keywords
- paper
- chitosan
- copy paper
- wollastonite fiber
- softwood pulp
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 105
- 239000010456 wollastonite Substances 0.000 claims abstract description 72
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 72
- 229920001661 Chitosan Polymers 0.000 claims abstract description 47
- 239000011122 softwood Substances 0.000 claims abstract description 47
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims abstract description 26
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- 238000004513 sizing Methods 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- LTVDFSLWFKLJDQ-UHFFFAOYSA-N α-tocopherolquinone Chemical compound CC(C)CCCC(C)CCCC(C)CCCC(C)(O)CCC1=C(C)C(=O)C(C)=C(C)C1=O LTVDFSLWFKLJDQ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000008961 swelling Effects 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 238000004537 pulping Methods 0.000 claims description 19
- 238000003490 calendering Methods 0.000 claims description 10
- 229920002472 Starch Polymers 0.000 claims description 8
- 125000002091 cationic group Chemical group 0.000 claims description 8
- 239000008107 starch Substances 0.000 claims description 8
- 235000019698 starch Nutrition 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 230000006196 deacetylation Effects 0.000 claims description 2
- 238000003381 deacetylation reaction Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 239000002557 mineral fiber Substances 0.000 description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 239000011121 hardwood Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229920006317 cationic polymer Polymers 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 206010016654 Fibrosis Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004761 fibrosis Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
-
- 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
Abstract
The application relates to the field of copy paper production, and particularly discloses high-strength copy paper and a production method thereof. A high-strength copy paper comprises base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper; according to the parts by weight, the paper pulp adopted by the base paper comprises the following components: 80-100 parts of softwood pulp and 20-40 parts of modified wollastonite fiber; the preparation method of the modified wollastonite fiber comprises the following steps: uniformly mixing a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution and a chitosan isopropanol swelling solution, adjusting the pH value to be alkaline, reacting, wherein the weight ratio of the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to the chitosan is 1 (4-6), preparing a quaternary ammonium salt chitosan solution with the mass fraction of 0.8-1.2 g/L, soaking a wollastonite fiber raw material in the quaternary ammonium salt chitosan solution, taking out, and draining to obtain the modified wollastonite fiber.
Description
Technical Field
The application relates to the field of copy paper production, in particular to high-strength copy paper and a production method thereof.
Background
The copy paper is a high-grade cultural industrial paper with certain production difficulty, has excellent uniformity and transparency, and fine, smooth and smooth surface properties, and is commonly used for packaging products such as clothes, shoes, leather products and the like, seal cutting, carving and the like.
The production of copy paper is divided into two basic processes of pulping and papermaking, wherein the pulping is to dissociate plant fiber raw materials into pulp by a mechanical method, a chemical method or a combination method of the mechanical method and the chemical method. The paper making process includes the steps of pulp board disintegrating, beating, pulp screening, pulp discharging from pulp flowing box, dewatering in net part, squeezing dewatering, drying, calendering, winding, rewinding and packing.
Copy paper is generally made by using 100% bleached chemical wood pulp as a raw material, but China is a country lacking in forest resources, and mineral fibers are used for replacing part of plant fibers in paper making industry to protect the forest resources. The mineral fibers have high hardness and rigidity, and the strength of the paper can be improved by correctly using the mineral fibers, but the combination between the mineral fibers and the plant fibers is relatively difficult, the transparency of the paper is reduced, and the requirement of copy paper is difficult to meet.
Disclosure of Invention
In order to improve the transparency of copy paper when mineral fibers replace part of plant fibers to make copies, the application provides high-strength copy paper and a production method thereof.
In a first aspect, the present application provides a high-strength copy paper, which adopts the following technical scheme:
a high-strength copy paper comprises base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
the raw paper adopts paper pulp which comprises the following components in parts by weight: 80-100 parts of softwood pulp and 20-40 parts of modified wollastonite fiber;
wherein, the first and the second end of the pipe are connected with each other,
the preparation method of the modified wollastonite fiber comprises the following steps: uniformly mixing 1-3 parts of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and 3-5 parts of chitosan isopropanol swelling solution for reaction, wherein the reaction pH value is 9-10, and drying after the reaction is finished to obtain quaternary ammonium salt chitosan; soaking the wollastonite fiber raw material in a quaternary ammonium salt chitosan solution with the mass fraction of 1g/L, taking out, and draining to obtain the modified wollastonite fiber.
By adopting the technical scheme, the modified wollastonite fiber can replace part of softwood pulp to be used for producing copy paper, so that forest resources are protected. The surface of the wollastonite fiber is negatively charged, the surface of the softwood pulp fiber is also negatively charged, the electrostatic repulsion between the wollastonite fiber and the softwood pulp fiber is large, the wollastonite fiber and the softwood pulp fiber are not combined well, the wollastonite fiber and the softwood pulp fiber are not combined tightly, more fiber-air interfaces exist, and the transparency of the paper is low. The chitosan is modified by adopting a quaternary ammonium salt chitosan solution, the quaternary ammonium salt chitosan is a water-soluble cationic polymer, the quaternary ammonium salt chitosan has rich cations and can neutralize the negative electricity on the surface of wollastonite fibers, and the wollastonite fibers are adsorbed on the quaternary ammonium salt chitosan through electrostatic action. The softwood pulp belongs to long fibers, the wollastonite fibers belong to short fibers, and the quaternary ammonium salt chitosan extends in the paper pulp to form connecting bridges among the wollastonite fibers, so that the mineral fibers form a network structure, gaps among the plant fibers can be filled, the interface between the softwood pulp fibers and the air is reduced, and the transparency of the paper is improved.
In addition, hydroxyl on the quaternary ammonium salt chitosan can form hydrogen bonds with hydroxyl on the surface of the plant fiber, so that the binding force between the wollastonite fiber and the plant fiber is improved, the wollastonite fiber and the plant fiber are tightly bound, and the copy paper is prepared by mixing the modified wollastonite fiber and the softwood pulp, so that the tensile strength of the copy paper is improved.
Optionally, the diameter of the wollastonite fiber is 6 to 10 μm, and the length-diameter ratio is 15.
By adopting the scheme, the wollastonite fibers with larger major diameter ratios are adopted, so that the phenomena that the length-diameter ratio of the wollastonite fibers is too small, the effect of mixing and interweaving the wollastonite fibers with softwood pulp is not strong, and the surface uniformity of paper is poor can be improved.
Optionally, the reaction temperature of the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution and the chitosan isopropanol swelling solution is 70-80 ℃.
By adopting the technical scheme, the substitution degree of the quaternary ammonium salt chitosan synthesized in the temperature range is higher.
Optionally, the deacetylation degree of chitosan is greater than or equal to 90%.
Optionally, the pulping concentration of the softwood pulp is 4.0-5.0%, the pulping degree is 55-70 SR degrees, and the wet weight is 8.0-12.0 g.
By adopting the technical scheme, the softwood pulp with the property has sufficient fibrosis, better dispersion among plant fibers and higher manufacturing strength.
Optionally, the surface sizing agent is one or a combination of several of polyacrylamide, carboxymethyl cellulose and cationic starch.
By adopting the technical scheme, the addition of the surface sizing agent can increase the connection tightness between the wollastonite fiber and the plant fiber, and further improve the transparency of the paper. In addition, the sizing agent can also penetrate into gaps of the fibers, so that the surface strength of the paper is increased.
In a second aspect, the present application provides a method for producing a high strength copy paper, comprising the steps of:
soaking the softwood pulp board in water, and pulping to obtain softwood pulp;
uniformly mixing 20-40 parts of modified wollastonite fiber and 80-100 parts of softwood pulp, and papermaking to obtain raw paper;
and coating a surface sizing agent on the surface of the base paper, and performing calendaring to obtain copy paper.
By adopting the technical scheme, the high-strength copy paper can be produced by the production process.
In summary, the present application has the following beneficial effects:
1. in the application, the wollastonite fiber is preferably modified by adopting a quaternary ammonium salt chitosan solution, the quaternary ammonium salt chitosan is a cationic polymer, the surface of the quaternary ammonium salt chitosan is provided with abundant positive charges, the negative charges on the surface of the wollastonite fiber can be neutralized, the quaternary ammonium salt chitosan extends in paper pulp, the wollastonite fiber is adsorbed on the quaternary ammonium salt chitosan to form a mineral fiber grid structure, gaps among the fibers can be filled, the interface between plant fiber and air is reduced, and the transparency of paper is further improved.
2. Hydroxyl on the quaternary ammonium salt chitosan can form hydrogen bonds with hydroxyl on the surface of the plant fiber, so that the binding force between the wollastonite fiber and the plant fiber is improved, the wollastonite fiber and the plant fiber are tightly bound, and the copy paper is prepared by mixing the modified wollastonite fiber and the softwood pulp, so that the tensile strength of the copy paper is improved.
Detailed Description
The present application is described in further detail below.
Introduction of raw materials
TABLE 1 raw materials for copy paper production
Examples
Example 1
A high-strength copy paper comprises base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
according to the parts by weight, the paper pulp adopted by the base paper comprises the following components: 80 parts of softwood pulp and 40 parts of modified wollastonite fiber; wherein the content of the first and second substances,
the pulping concentration of the softwood pulp is 4.0%, the pulping degree is 70 DEG SR, and the wet weight is 8.0g;
the preparation method of the modified wollastonite fiber comprises the following steps: dissolving chitosan in isopropanol, stirring and swelling for 60min at 35 ℃ to obtain a chitosan isopropanol swelling solution, then slowly adding a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution, wherein the weight ratio of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to chitosan is 1;
the surface sizing agent adopts polyacrylamide;
the production method of the high-strength copy paper comprises the following steps:
soaking the softwood pulp board in water, and pulping to obtain softwood pulp;
uniformly mixing the modified wollastonite fiber and the softwood pulp, and papermaking to obtain base paper;
surface coating the base paper with sizing agent, the coating weight is 5g/Kg paper, and then the calendering pressure is 80 kN.m -1 The calender is calendered to obtain copy paper.
Example 2
A high-strength copy paper comprises base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
the raw paper adopts paper pulp which comprises the following components in parts by weight: 100 parts of softwood pulp and 20 parts of modified wollastonite fiber;
wherein the content of the first and second substances,
the pulping concentration of the softwood pulp is 5.0%, the pulping degree is 55 DEG SR, and the wet weight is 12.0g;
the preparation method of the modified wollastonite fiber comprises the following steps: dissolving chitosan in isopropanol, stirring and swelling for 60min at 35 ℃ to obtain a chitosan isopropanol swelling solution, then slowly adding a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution, wherein the weight ratio of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to chitosan is 1;
the surface sizing agent adopts polyacrylamide and carboxymethyl cellulose with the weight ratio of 1;
the production method of the high-strength copy paper comprises the following steps:
soaking the softwood pulp board in water, and pulping to obtain softwood pulp;
uniformly mixing the modified wollastonite fiber and the softwood pulp, and papermaking to obtain base paper;
surface coating the base paper with sizing agent, the coating weight is 5g/Kg paper, and then the calendering pressure is 80 kN.m -1 The calender is calendered to obtain copy paper.
Example 3
A high-strength copy paper comprises base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
according to the parts by weight, the paper pulp adopted by the base paper comprises the following components: 90 parts of softwood pulp and 30 parts of modified wollastonite fiber; wherein the content of the first and second substances,
the pulping concentration of the softwood pulp is 5.0%, the pulping degree is 60 DEG SR, and the wet weight is 10.0g;
the preparation method of the modified wollastonite fiber comprises the following steps: dissolving chitosan in isopropanol, stirring and swelling for 60min at 35 ℃ to obtain a chitosan isopropanol swelling solution, then slowly adding a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution, wherein the weight ratio of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to chitosan is 1;
the surface sizing agent adopts cationic starch;
the production method of the high-strength copy paper comprises the following steps:
soaking the softwood pulp board in water, and pulping to obtain softwood pulp;
uniformly mixing the modified wollastonite fiber and the softwood pulp, and papermaking to obtain base paper;
surface coating the base paper with sizing agent, the coating weight is 5g/Kg paper, and then the calendering pressure is 80 kN.m -1 The calender is calendered to obtain the copy paper.
Comparative example
Comparative example 1
A copy paper, differing from example 3 in that: all the softwood pulp is adopted, and copy paper is produced according to the same steps of papermaking, surface sizing agent coating and calendaring.
Comparative example 2
A copy paper, differing from example 3 in that: the modified wollastonite fiber is equivalently replaced by hardwood pulp, and the preparation of the hardwood pulp comprises the following steps: the hardwood pulp board is soaked in water and pulped to obtain hardwood pulp with pulping concentration of 3.5%, pulping degree of 80 DEG SR and wet weight of 4.5 g.
Comparative example 3
A copy paper, differing from example 3 in that: soaking wollastonite fiber raw materials in water, stirring for 4 hours, taking out the wollastonite fiber raw materials and draining to obtain water-soaked wollastonite fibers, and replacing modified wollastonite fibers with the water-soaked wollastonite fibers in equal amount.
Comparative example 4
A copy paper, differing from example 3 in that: the method adopts cationic starch to replace quaternary ammonium salt chitosan to modify wollastonite fiber raw materials, and the cationic starch modified wollastonite fiber raw materials comprise the following steps: adding the wollastonite fiber raw material into a 2g/L cationic starch aqueous solution, stirring for 5h, taking out, and draining to obtain the cationic starch wollastonite fiber.
Performance detection
Transparency test
The luminance factors of the single-layer sample black-backed tube and the white-backed substrate were measured by a reflectometer in accordance with the method specified in GB/T2679.1-2020, and the transparency was calculated from the measured luminance factors.
Paper strength test
The tensile strength of the paper was measured according to the method specified in GB/T12914-2008.
Table 2 test results of transparency and tensile strength of copy papers prepared in examples 1 to 3 and comparative examples 1 to 4
Comparative example 1 and comparative example 2 are manufacturing processes of copy paper which are adopted at present, according to test data recorded in table 2, from the comparative example 1, the comparative example 2 and the examples 1 to 3, it can be seen that the transparency of the high-strength copy paper prepared by the method is close to the transparency level of the copy paper prepared by the prior art, and meanwhile, the tensile strength is greatly improved, so that the modified wollastonite fiber and the softwood pulp are mixed to replace part of the softwood pulp, and forest resources are protected.
From comparative example 3 and example 3, it can be seen that the modification treatment of wollastonite fibers in the present application has a great influence on both transparency and tensile strength of copy paper. The reason is analyzed, the water-soaked wollastonite fibers are not modified and are mixed with the softwood pulp, the water-soaked wollastonite fibers and the softwood pulp are difficult to interweave and are not tight, the transparency of the paper is low, and the tensile strength of the paper is also reduced. In the application, the quaternary ammonium salt chitosan has rich cations and can neutralize the negative electricity on the surface of wollastonite fibers, and the wollastonite fibers are adsorbed on the quaternary ammonium salt chitosan through electrostatic interaction. The softwood pulp belongs to long fibers, the wollastonite fibers belong to short fibers, and the quaternary ammonium salt chitosan extends in the paper pulp to form connecting bridges among the wollastonite fibers, so that the mineral fibers form a network structure, gaps among the plant fibers can be filled, the interface between the softwood pulp fibers and the air is reduced, and the transparency of the paper is improved. Meanwhile, as the hydroxyl on the quaternary ammonium salt chitosan can form hydrogen bonds with the hydroxyl on the surface of the plant fiber, the binding force between the wollastonite fiber and the plant fiber is improved, so that the wollastonite fiber and the plant fiber are tightly bound, the copy paper is prepared by mixing the modified wollastonite fiber and the softwood pulp, and the tensile strength of the copy paper is improved.
As can be seen from comparative example 4 and example 3, the method for modifying wollastonite fibers by compounding the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution and the chitosan isopropanol swelling solution plays an important role in maintaining the transparency of copy paper. The traditional method for modifying the wollastonite fiber by adopting the cationic starch is favorable for improving the tensile strength of copy paper, but has serious adverse effect on the transparency of the copy paper, and the method is related to the scheme of the application, which can not only improve the connection strength between the wollastonite fiber and the softwood pulp fiber, but also effectively improve the tightness between the wollastonite fiber and the softwood pulp fiber so as to greatly eliminate the interface size between the fiber and air.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the present invention as required without any inventive contribution after reading the present specification, but all such modifications are intended to be included within the scope of the present application.
Claims (8)
1. A high-strength copy paper is characterized by comprising base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
according to the parts by weight, the paper pulp adopted by the base paper comprises the following components: 80-100 parts of softwood pulp and 20-40 parts of modified wollastonite fiber;
wherein the content of the first and second substances,
the preparation method of the modified wollastonite fiber comprises the following steps: uniformly mixing a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution and a chitosan isopropanol swelling solution, adjusting the pH value to be alkaline, and reacting, wherein the weight ratio of the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to the chitosan is 1 (4-6), filtering after the reaction is finished to obtain quaternary ammonium salt chitosan, adding water into the quaternary ammonium salt chitosan to prepare the quaternary ammonium salt chitosan solution with the mass fraction of 0.8 g/L-1.2 g/L, then soaking a wollastonite fiber raw material in the quaternary ammonium salt chitosan solution, taking out and draining to obtain the modified wollastonite fiber.
2. A high strength copying sheet according to claim 1 wherein: the diameter of the wollastonite fiber is 6-10 μm, and the length-diameter ratio is 15.
3. A high strength copy paper according to claim 1, wherein: the reaction temperature of the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution and the chitosan isopropanol swelling solution is 70-80 ℃.
4. A high strength copy paper according to claim 1, wherein: the deacetylation degree of the chitosan is more than or equal to 90 percent.
5. A high strength copy paper according to claim 1, wherein: after the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and the chitosan isopropanol swelling solution are uniformly mixed, the pH value is adjusted to 9-10.
6. A high strength copying paper according to claim 1, wherein: the pulping concentration of the softwood pulp is 4.0-5.0%, the pulping degree is 55-70 DEG SR, and the wet weight is 8.0-12.0 g.
7. A high strength copy paper according to claim 1, wherein: the surface sizing agent adopts one or a combination of more of polyacrylamide, carboxymethyl cellulose and cationic starch.
8. A method for producing a high-strength copy paper as set forth in any one of claims 1 to 7, comprising the steps of:
soaking the softwood pulp board in water, and pulping to obtain softwood pulp;
uniformly mixing 20-40 parts of modified wollastonite fiber and 80-100 parts of softwood pulp, and papermaking to obtain raw paper;
and coating a surface sizing agent on the surface of the base paper, and performing calendaring to obtain copy paper.
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| CN202211187507.3A CN115491927B (en) | 2022-09-28 | 2022-09-28 | High-strength copy paper and production method thereof |
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| CN202211187507.3A CN115491927B (en) | 2022-09-28 | 2022-09-28 | High-strength copy paper and production method thereof |
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| CN115491927B CN115491927B (en) | 2023-11-10 |
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