CN115491927B - High-strength copy paper and production method thereof - Google Patents
High-strength copy paper and production method thereof Download PDFInfo
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- CN115491927B CN115491927B CN202211187507.3A CN202211187507A CN115491927B CN 115491927 B CN115491927 B CN 115491927B CN 202211187507 A CN202211187507 A CN 202211187507A CN 115491927 B CN115491927 B CN 115491927B
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- 238000004519 manufacturing process Methods 0.000 title abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 102
- 239000010456 wollastonite Substances 0.000 claims abstract description 68
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 68
- 229920001661 Chitosan Polymers 0.000 claims abstract description 61
- 239000011122 softwood Substances 0.000 claims abstract description 42
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 37
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- 238000004513 sizing Methods 0.000 claims abstract description 25
- 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 18
- 230000008961 swelling Effects 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000004537 pulping Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000003490 calendering Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 9
- 229920002472 Starch Polymers 0.000 claims description 8
- 125000002091 cationic group Chemical group 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000008107 starch Substances 0.000 claims description 8
- 235000019698 starch Nutrition 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 4
- 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
- 239000000243 solution Substances 0.000 description 29
- 241000196324 Embryophyta Species 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000002557 mineral fiber Substances 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 238000001035 drying 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
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 229920006317 cationic polymer Polymers 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001397809 Hakea leucoptera Species 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
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction 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 production of copy paper, and particularly discloses high-strength copy paper and a production method thereof. A high-strength copy paper comprises a base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper; the paper pulp adopted by the base paper comprises the following components in parts by weight: 80-100 parts of softwood pulp and 20-40 parts of modified wollastonite fiber; wherein, the preparation 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, regulating the pH to be alkaline, carrying out a reaction, preparing a quaternary ammonium salt chitosan solution with the mass fraction of 0.8-1.2 g/L, taking out and draining to obtain the modified wollastonite fiber, wherein the weight ratio of the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to the chitosan is 1 (4-6).
Description
Technical Field
The application relates to the field of production of copy paper, 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 clothing, shoes, leather products and the like, seal cutting engraving and the like.
The production of copy paper is divided into two basic processes of pulping and papermaking, wherein pulping is to use mechanical method, chemical method or the combination of two methods to dissociate plant fiber raw materials into pulp. The paper making process includes the steps of pulp board breaking, beating, sieving, pulp discharging in a pulp box, dewatering in a net part, squeezing, drying, calendaring, reeling, rewinding and packing.
The production of copy paper generally uses 100% bleached chemical wood pulp as raw material, but China is a country lacking forest resources, and in order to protect forest resources, mineral fibers are used for replacing part of plant fibers in paper industry for papermaking. The mineral fibers have high hardness and rigidity, and the strength of 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 can be reduced, and the requirement of copying paper is difficult to reach.
Disclosure of Invention
In order to improve transparency of the copy paper when the mineral fiber replaces part of the plant fiber to manufacture the copy paper, 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 a base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
the paper pulp adopted by the base paper comprises the following components in parts by weight: 80-100 parts of softwood pulp and 20-40 parts of modified wollastonite fiber;
wherein,
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 with 3-5 parts of chitosan isopropanol swelling solution, reacting at a pH value of 9-10, and drying after the reaction is finished to obtain quaternary ammonium salt chitosan; and (3) immersing the wollastonite fiber raw material in a quaternary ammonium salt chitosan solution with the mass fraction of 1g/L, and 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. Because the surface of the wollastonite fiber is negatively charged, the surface of the softwood pulp fiber is also negatively charged, the electrostatic repulsive force between the wollastonite fiber and the softwood pulp fiber is larger, the bonding is not good, the bonding between the wollastonite fiber and the softwood pulp fiber after bonding is not tight enough, more interfaces between the fiber and the air exist, and the transparency of the paper is lower. The quaternary ammonium salt chitosan solution is adopted to modify chitosan, the quaternary ammonium salt chitosan is a water-soluble cationic polymer, the quaternary ammonium salt chitosan has abundant cations and can neutralize negative electricity on the surface of wollastonite fiber, and the wollastonite fiber is 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 stretches in the paper pulp to form a connecting bridge between the wollastonite fibers, so that mineral fibers form a network structure, gaps between plant fibers can be filled, the interface between the softwood pulp fibers and air is reduced, and the transparency of paper is further improved.
In addition, the hydroxyl on the quaternary ammonium salt chitosan can form a hydrogen bond with the hydroxyl on the surface of the plant fiber, so that the binding force between the wollastonite fiber and the plant fiber is improved, and the binding force between the wollastonite fiber and the plant fiber is tight.
Alternatively, the wollastonite fiber has a diameter of 6 μm to 10 μm and an aspect ratio of 15:1 to 20:1.
By adopting the scheme, the wollastonite fiber with larger length-diameter ratio is adopted, so that the phenomena of weak mixing and interweaving effects of the wollastonite fiber with the softwood pulp and poor surface uniformity of paper can be improved.
Alternatively, 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 synthesized quaternary ammonium salt chitosan is higher in the temperature range.
Optionally, the deacetylation degree of chitosan is more than or equal to 90%.
Optionally, 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.
By adopting the technical scheme, the softwood pulp with the property has the advantages of full fine fiber, good dispersibility among plant fibers and high manufacturing strength.
Optionally, the surface sizing agent adopts one or a combination of more of polyacrylamide, carboxymethyl cellulose and cationic starch.
By adopting the technical scheme, the addition of the surface sizing agent can increase the connection tightness degree between wollastonite fibers and plant fibers, and further improve the transparency of the paper. In addition, the sizing agent can also penetrate into the gap between the fibers, so that the surface strength of the paper is increased.
In a second aspect, the present application provides a method for producing high-strength copy paper, comprising the steps of:
soaking the softwood pulp plate in water, and pulping to obtain softwood pulp;
uniformly mixing 20-40 parts of modified wollastonite fiber with 80-100 parts of softwood pulp, and papermaking to obtain base paper;
coating a surface sizing agent on the surface of the base paper, and then calendaring to obtain the copy paper.
By adopting the technical scheme, the high-strength copy paper can be produced through the production process.
In summary, the application has the following beneficial effects:
1. according to the application, the wollastonite fiber is preferably modified by adopting the quaternary ammonium salt chitosan solution, and as the quaternary ammonium salt chitosan is a cationic polymer, the surface of the quaternary ammonium salt chitosan has rich positive charges, so that negative electricity on the surface of the wollastonite fiber can be neutralized, the quaternary ammonium salt chitosan stretches in paper pulp, and the wollastonite fiber is adsorbed on the quaternary ammonium salt chitosan to form a mineral fiber grid structure, so that gaps among the fibers can be filled, the interface between plant fibers and air is reduced, and the transparency of paper is further improved.
2. The hydroxyl on the quaternary ammonium salt chitosan can form a hydrogen bond with the hydroxyl on the surface of the plant fiber, so that the binding force between the wollastonite fiber and the plant fiber is improved, and the binding between the wollastonite fiber and the plant fiber is tight.
Detailed Description
The present application will be 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 a base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
the paper pulp adopted by the base paper comprises the following components in parts by weight: 80 parts of softwood pulp and 40 parts of modified wollastonite fiber; wherein,
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, slowly adding 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution, wherein the weight ratio of the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to the chitosan is 1:4, uniformly mixing the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution with the chitosan isopropanol swelling solution, regulating the pH value to be 9 by adopting NaOH solution, heating to 70 ℃, reacting at constant temperature for 7h, filtering, washing by absolute ethyl alcohol, drying at 70 ℃ to obtain quaternary ammonium salt chitosan, adding water into the quaternary ammonium salt chitosan solution with the mass fraction of 0.8g/L, soaking the quaternary ammonium salt chitosan into the quaternary ammonium salt chitosan solution, stirring for 4h, and taking out and draining to obtain modified wollastonite fibers;
the surface sizing agent adopts polyacrylamide;
the production method of the high-strength copy paper comprises the following steps:
soaking the softwood pulp plate in water, and pulping to obtain softwood pulp;
uniformly mixing the modified wollastonite fiber with softwood pulp, and papermaking to obtain base paper;
the sizing agent is used for surface coating of base paper, the coating amount is 5g/Kg of paper, and the calendaring pressure is 80 kN.m -1 Is calendered to obtain the copy paper.
Example 2
A high-strength copy paper comprises a base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
the paper pulp adopted by the base paper comprises the following components in parts by weight: 100 parts of softwood pulp and 20 parts of modified wollastonite fibers;
wherein,
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, slowly adding 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution, wherein the weight ratio of the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to the chitosan is 1:6, uniformly mixing the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution with the chitosan isopropanol swelling solution, regulating the pH value to be 10 by adopting NaOH solution, heating to 80 ℃, reacting for 9h at constant temperature, filtering, washing by absolute ethyl alcohol, drying at 70 ℃ to obtain quaternary ammonium salt chitosan, adding water into the quaternary ammonium salt chitosan solution with the mass fraction of 1.2g/L, soaking the quaternary ammonium salt chitosan into the quaternary ammonium salt chitosan solution, stirring for 4h, and taking out and draining to obtain modified wollastonite fibers;
the surface sizing agent adopts polyacrylamide and carboxymethyl cellulose with the weight ratio of 1:1;
the production method of the high-strength copy paper comprises the following steps:
soaking the softwood pulp plate in water, and pulping to obtain softwood pulp;
uniformly mixing the modified wollastonite fiber with softwood pulp, and papermaking to obtain base paper;
the sizing agent is used for surface coating of base paper, the coating amount is 5g/Kg of paper, and the calendaring pressure is 80 kN.m -1 Is calendered to obtain the copy paper.
Example 3
A high-strength copy paper comprises a base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
the paper pulp adopted by the base paper comprises the following components in parts by weight: 90 parts of softwood pulp and 30 parts of modified wollastonite fibers; wherein,
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, slowly adding 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution, wherein the weight ratio of the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to the chitosan is 1:5, uniformly mixing the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution with the chitosan isopropanol swelling solution, regulating the pH value to be 9 by adopting NaOH solution, heating to 75 ℃, reacting at constant temperature for 8h, filtering, washing by absolute ethyl alcohol, drying at 70 ℃ to obtain quaternary ammonium salt chitosan, adding water into the quaternary ammonium salt chitosan solution with the mass fraction of 1.0g/L, soaking the quaternary ammonium salt chitosan into the quaternary ammonium salt chitosan solution, stirring for 4h, and taking out and draining to obtain modified wollastonite fibers;
the surface sizing agent adopts cationic starch;
the production method of the high-strength copy paper comprises the following steps:
soaking the softwood pulp plate in water, and pulping to obtain softwood pulp;
uniformly mixing the modified wollastonite fiber with softwood pulp, and papermaking to obtain base paper;
the sizing agent is used for surface coating of base paper, the coating amount is 5g/Kg of paper, and the calendaring pressure is 80 kN.m -1 Is calendered to obtain the copy paper.
Comparative example
Comparative example 1
A copy paper differing from example 3 in that: the needle wood pulp is adopted, and the 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 replaced by hardwood pulp in equal quantity, 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 the pulping concentration of 3.5%, the pulping degree of 80 DEG SR and the wet weight of 4.5 g.
Comparative example 3
A copy paper differing from example 3 in that: and (3) immersing the wollastonite fiber raw material in water, stirring for 4 hours, taking out and draining to obtain water-immersed wollastonite fibers, and replacing the modified wollastonite fibers with the water-immersed wollastonite fibers in an equivalent manner.
Comparative example 4
A copy paper differing from example 3 in that: the cationic starch is used for modifying wollastonite fiber raw materials instead of quaternary ammonium salt chitosan, and the cationic starch modified wollastonite fiber raw materials comprise the following steps: and adding the wollastonite fiber raw material into 2g/L of the cationic starch aqueous solution, stirring for 5 hours, taking out and draining to obtain the cationic starch wollastonite fiber.
Performance detection
Transparency test
The brightness factors of the single-layer sample backing black cylinder and backing white backing were measured separately using a reflectance photometer according to the method specified in GB/T2679.1-2020, and the transparency was calculated from the measured brightness factors.
Paper strength test
The tensile strength of the paper was measured according to the method specified in GB/T12914-2008.
Table 2 results of testing transparency and tensile strength of the copy papers prepared in examples 1 to 3 and comparative examples 1 to 4
Comparative examples 1 and 2 are the present examples using a larger number of processes for making the copy paper, and according to the test data shown in table 2, it can be seen from comparative examples 1, 2 and examples 1 to 3 that the transparency of the high-strength copy paper prepared by the present application is close to that of the copy paper prepared by the present technology, and at the same time, the tensile strength is also greatly improved, so that the modified wollastonite fiber and the softwood pulp are mixed to replace part of the usage amount of the softwood pulp, and the forest resources are protected.
It can be seen from comparative example 3 and example 3 that the modification treatment of wollastonite fiber according to the present application has a great influence on transparency and tensile strength of copy paper. For this reason, the water-impregnated wollastonite fiber was not modified, and mixed with softwood pulp, and the interweaving between the water-impregnated wollastonite fiber and the softwood pulp was difficult and not tight, and not only the transparency of the paper was low but also the tensile strength of the paper was lowered. In the application, the quaternary ammonium salt chitosan has abundant cations and can neutralize negative electricity on the surface of wollastonite fiber, and the wollastonite fiber is 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 stretches in the paper pulp to form a connecting bridge between the wollastonite fibers, so that mineral fibers form a network structure, gaps between plant fibers can be filled, the interface between the softwood pulp fibers and air is reduced, and the transparency of paper is further improved. Meanwhile, as the hydroxyl on the quaternary ammonium salt chitosan can form a hydrogen bond 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 binding between the wollastonite fiber and the plant fiber is tight.
As can be seen from comparative example 4 and example 3, the application adopts the means of modifying wollastonite fiber by compounding 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution and chitosan isopropanol swelling solution, and has important effect on maintaining transparency of copy paper. While the traditional means for modifying wollastonite fiber by adopting cationic starch is favorable for improving the tensile strength of the copy paper, the transparency of the copy paper can be seriously and negatively affected, and the scheme of the application can not only improve the connection strength between wollastonite fiber and softwood pulp fiber, but also effectively improve the tightness between wollastonite fiber and softwood pulp fiber so as to greatly eliminate the interface size of the fiber and air.
The above-described embodiments are merely illustrative of the present application and are not intended to be limiting, and those skilled in the art, having read the present specification, may make modifications without inventive contribution to the application as desired, but are intended to be within the scope of the application.
Claims (6)
1. A high-strength copy paper is characterized by comprising a base paper and a surface sizing agent layer formed by coating a surface sizing agent on the surface of the base paper;
the paper pulp adopted by the base paper comprises the following components in parts by weight: 80-100 parts of softwood pulp and 20-40 parts of modified wollastonite fiber;
wherein,
the preparation method of the modified wollastonite fiber comprises the following steps: uniformly mixing a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution with a chitosan isopropanol swelling solution, regulating the pH 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 a quaternary ammonium salt chitosan solution with the mass fraction of 0.8 g/L-1.2 g/L, soaking wollastonite fiber raw materials in the quaternary ammonium salt chitosan solution, and taking out and draining to obtain modified wollastonite fibers;
the diameter of the wollastonite fiber is 6-10 mu m, and the length-diameter ratio is 15:1-20:1;
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.
2. A high strength copy paper as claimed in 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 ℃.
3. A high strength copy paper as claimed in claim 1, wherein: the deacetylation degree of the chitosan is more than or equal to 90 percent.
4. A high strength copy paper as claimed in claim 1, wherein: and after the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and the chitosan isopropanol swelling solution are uniformly mixed, regulating the pH value to 9-10.
5. A high strength copy paper as claimed in claim 1, wherein: the surface sizing agent adopts one or a combination of more of polyacrylamide, carboxymethyl cellulose and cationic starch.
6. A method of producing a high strength copy paper as claimed in any one of claims 1 to 5, comprising the steps of:
soaking the softwood pulp plate in water, and pulping to obtain softwood pulp;
uniformly mixing 20-40 parts of modified wollastonite fiber with 80-100 parts of softwood pulp, and papermaking to obtain base paper;
coating a surface sizing agent on the surface of the base paper, and then calendaring to obtain the copy paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211187507.3A CN115491927B (en) | 2022-09-28 | 2022-09-28 | High-strength copy paper and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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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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| Publication Number | Publication Date |
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| CN115491927A CN115491927A (en) | 2022-12-20 |
| CN115491927B true CN115491927B (en) | 2023-11-10 |
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Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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