CN111622017B - Low-air-permeability CTP plate lining paper and preparation method thereof - Google Patents

Low-air-permeability CTP plate lining paper and preparation method thereof Download PDF

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CN111622017B
CN111622017B CN202010381852.5A CN202010381852A CN111622017B CN 111622017 B CN111622017 B CN 111622017B CN 202010381852 A CN202010381852 A CN 202010381852A CN 111622017 B CN111622017 B CN 111622017B
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paper
lining paper
ctp
hyperbranched polymer
reaction
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CN111622017A (en
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毛学米
王昱哲
周晓光
黄学英
董金雨
杨奎占
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Xianhe Co ltd
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Xianhe Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
    • C08G83/002—Dendritic macromolecules
    • C08G83/005—Hyperbranched macromolecules
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/08—Mechanical or thermomechanical pulp
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/16—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising curable or polymerisable compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • 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

Abstract

The invention relates to the technical field of papermaking and discloses a low-air permeability CTP plate lining paper and a preparation method thereof. The CTP plate lining paper comprises raw materials of softwood pulp, hardwood pulp and polyhydroxy hyperbranched polymer; the mass ratio of the hardwood pulp to the softwood pulp is 1: 3-5; the dosage of the polyhydroxy hyperbranched polymer is 1-1.5% of the total dry weight of the softwood pulp and the hardwood pulp. The CTP lining paper has low air permeability, can be absorbed by a vacuum sucker, has high stiffness, and is not easy to fold in the taking and placing process, so that the CTP lining paper can be well adapted to automatic paper taking of an intelligent manipulator.

Description

Low-air-permeability CTP plate lining paper and preparation method thereof
Technical Field
The invention relates to the technical field of papermaking, in particular to a low-air permeability CTP plate lining paper and a preparation method thereof.
Background
Computer To Plate (CTP) is a technology for making an image and text image into a printing plate which can be printed on a Computer directly by a Computer, and is an imaging process of a digital printing plate. It uses CTP plate with high resolution to directly scan and record image, reduces image transfer times, obviously improves plate-making quality and printing quality, and is rapidly popularized in recent ten years. When CTP plates are stacked, interlayer friction is easy to occur to cause damage to photosensitive layers, so CTP plate lining paper (also called material spacing paper) can be lined between the CTP plates during storage, and the CTP plate photosensitive layers are prevented from being abraded.
Chinese patent publication No. CN103276628B discloses a CTP plate packing paper and a preparation method thereof, the preparation method comprising the steps of: (1) mixing and disintegrating bleached needle pulp and broad leaf pulp according to a proportion to prepare pulp; (2) pulping the disintegrated liquid pulp to fibrillate the wood pulp fiber; (3) adding a starch enhancing additive into the pulped pulp; (4) after the prepared pulp is subjected to purification treatment, the pulp is dried by a fourdrinier forming drying cylinder, and a surface strengthening auxiliary agent is coated in the middle of the drying process, so that the wear resistance of the surface of the paper is improved; (5) the dried paper is finished by calendaring to improve the surface smoothness; (6) the internal moisture is balanced, and the flatness of the paper is improved; (7) and (3) slitting and high-cleanness electrostatic dust removal treatment are carried out on the paper roll manufactured by the paper machine to prepare a finished product according to the specification requirement, so as to obtain the product. The CTP plate packing paper prepared by the method has the characteristics of good strength, high cleanliness, good smoothness, neutral paper pH value and the like. However, in recent years, with the progress of science and technology and the innovation of equipment, automation and intellectualization have gradually replaced manual operation, and a plurality of high-speed automatic production lines have appeared in China, which requires that the CTP plate lining paper can adapt to an intelligent manipulator to automatically take paper from the high-speed production lines, so the CTP plate lining paper needs to have lower air permeability and can be absorbed by a vacuum suction cup on the manipulator, and the CTP plate lining paper prepared by the preparation method has higher air permeability and cannot adapt to the current new automatic production line.
Disclosure of Invention
In order to solve the technical problems, the invention provides a CTP plate lining paper with low air permeability and a preparation method thereof. This CTP version slip sheet air permeability is low, can be absorbed by vacuum chuck, therefore can adapt to intelligent manipulator and follow the automatic paper of getting on the high-speed production line.
The specific technical scheme of the invention is as follows:
a low air permeability CTP plate lining paper comprises raw materials of softwood pulp, hardwood pulp and polyhydroxy hyperbranched polymer; the mass ratio of the hardwood pulp to the softwood pulp is 1: 3-5; the dosage of the polyhydroxy hyperbranched polymer is 1-1.5% of the total dry weight of the softwood pulp and the hardwood pulp.
The polyhydroxy hyperbranched polymer has a large number of branched chains, and hydroxyl groups in the cellulose are combined with hydroxyl groups on each branched chain, so that the cellulose and the polyhydroxy hyperbranched polymer are highly crosslinked, and the crosslinking degree between fibers is increased; in addition, the polyhydroxy hyperbranched polymer also plays a role of a dispersant, so that the fibers are dispersed more uniformly, thereby increasing the binding points among the fibers and between the fibers and the molecules of the polyhydroxy hyperbranched polymer and further increasing the crosslinking degree of the fibers. The increase of cross-linking degree between the fibre enables the air permeability of slip sheet to descend, makes it can be absorb by vacuum chuck, and simultaneously, the increase of cross-linking degree can also make the stiffness of slip sheet improve, makes it get in the automation and puts the difficult emergence folding of in-process.
Preferably, the preparation process of the polyhydroxy hyperbranched polymer is as follows:
(a) under the protection of inert gas, dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine for sufficient reaction; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product;
(b) mixing the product obtained in the step (a) with glyceric acid and an esterification catalyst, and carrying out polycondensation reaction under the protection of inert gas; after the reaction is finished, adding methanol to fully dissolve, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer.
In the step (a), the main reaction is that the acid anhydride in the pyromellitic dianhydride and the imino in the 2, 2' -dihydroxydipropylamine are subjected to acylation reaction, the hydrogen in the imino is replaced by acyl, and one-N (CH) is respectively connected to four ketone groups in the pyromellitic dianhydride2CH(CH3)OH)2The four substituent chains on the benzene ring of the product have eight hydroxyl groups at the tail ends. In addition, side reaction occurs, acid anhydride in the pyromellitic dianhydride and hydroxyl in the 2, 2' -dihydroxydipropylamine undergo alcoholysis reaction, the product of the main reaction and the product of the side reaction also undergo acylation reaction or alcoholysis reaction with the acid anhydride in the pyromellitic dianhydride, so that a plurality of molecules containing benzene rings are combined together, and the chain ends of the reaction products all have a plurality of hydroxyl groups.
In the step (b), carboxyl in glyceric acid and hydroxyl at the tail end of the product chain in the step (a) are subjected to esterification reaction, then two hydroxyl in glyceric acid are respectively subjected to esterification reaction with carboxyl in the other two glyceric acids, and by analogy, the molecular chain is continuously prolonged and branched through the self-polycondensation reaction of glyceric acid, and in the process, because the esterification reaction activities of the two hydroxyl (secondary alcohol and primary alcohol) in glyceric acid are different, a large amount of hydroxyl which is not esterified exists in the molecular chain of the generated hyperbranched polymer.
Preferably, in the step (a), the mass ratio of pyromellitic dianhydride to 2, 2' -dihydroxydipropylamine is 1: 4.1-4.6.
Preferably, in the step (b), the mass ratio of the product obtained in the step (a) to glyceric acid is 1: 400-450.
Preferably, in step (b), the temperature of the polycondensation reaction is 160-170 ℃, the pressure is 0.02-0.08 kPa, and the time is 4-5 h.
The cross-linking degree of cellulose is small due to the fact that the molecular weight of the polyhydroxy hyperbranched polymer is too small, so that the air permeability of lining paper is large, the lining paper cannot be sucked by a vacuum chuck, the stiffness is small, and the lining paper is easy to fold in the automatic picking and placing process; the polyhydroxy hyperbranched polymer has too high molecular weight, can cause the entanglement of polymer molecular chains, can not form effective combination with cellulose, and can also cause the air permeability of the lining paper to be larger and the stiffness to be smaller. According to the invention, by controlling the raw material ratio and the reaction conditions of the polycondensation reaction, the molecular weight of the prepared polyhydroxy hyperbranched polymer can be controlled within the range of 300000-400000 g/mol, so that the lining paper has the characteristics of low air permeability and high stiffness, and is convenient for automatic storage and taking.
Preferably, in step (b), the esterification catalyst is p-toluenesulfonic acid; the dosage of the p-toluenesulfonic acid is 2-2.5% of the total mass of the product obtained in the step (a) and glyceric acid.
Preferably, the starting material also comprises acrylamide.
The effect of the polyhydroxy hyperbranched polymer on reducing the air permeability of the lining paper is limited, and the inventor team finds that when the addition amount of the polyhydroxy hyperbranched polymer is increased to a certain value and then the addition amount is increased, the air permeability of the lining paper is not obviously reduced; moreover, with the increase of the addition amount of the polyhydroxy hyperbranched polymer, the problem of pasting is easily caused during paper making, the forming of the lining paper is influenced, and the surface performance, the evenness and the strength of the lining paper are further influenced. Therefore, there is a need to further reduce the air permeability of the interleaving paper by other methods.
The invention grafts acrylamide to the liner surface, with some acrylamide grafted to the fibers as monomers and some as homopolymers. The acrylamide monomers on the surfaces of the fibers are adhered to ensure that the fibers are tightly contacted, so that the air permeability of the lining paper is reduced and the stiffness of the lining paper is improved; meanwhile, the polyacrylamide chains are tangled, and a net structure is formed on the surface of the lining paper to prevent air circulation, so that the air permeability of the lining paper is reduced.
A method for preparing the low-air permeability CTP plate lining paper comprises the following steps:
(1) mixing softwood pulp and hardwood pulp, pulping, and beating until the beating degree is 50-60 DEG SR;
(2) adding the polyhydroxy hyperbranched polymer into the pulped slurry, and mixing and stirring to obtain mixed slurry;
(3) diluting the mixed slurry, screening, forming a net part to obtain wet paper, and then squeezing, dehydrating and drying;
(4) and (3) carrying out calendaring after the surface of the dried paper is wetted by spraying, and then drying again to obtain the low-air-permeability CTP plate lining paper.
Carry out quick surface to the paper and spout wet before carrying out the press polish, help carrying out the paper face through the press polish and decorate, can accelerate press polish speed, reduce press polish pressure.
Preferably, in step (3), acrylamide is grafted to the surface of the wet sheet after the web portion is formed.
Preferably, the step of grafting acrylamide on the surface of the wet paper is as follows: dissolving acrylamide and a photoinitiator in alcohol to obtain a mixed solution; spraying the mixed solution onto the surface of wet paper in a spraying mode, and carrying out grafting reaction under the irradiation of ultraviolet light.
According to the invention, acrylamide is grafted on the surface of the lining paper by adopting an ultraviolet surface grafting method, so that the air permeability of the lining paper is reduced, and the stiffness of the lining paper is increased. The grafting mechanism is as follows: under the irradiation of ultraviolet light, some types of initiators (such as benzoins) are subjected to homolytic cleavage to generate two free radicals which move to the surface of cellulose molecules to deprive hydrogen on cellulose so as to generate free radicals on the surface of the cellulose, thereby initiating the grafting reaction of acrylamide monomers on the surface of the cellulose; other types of initiators (such as aromatic ketones) are excited to a singlet state under the irradiation of ultraviolet light and then rapidly cross-link to a triplet state, which deprives hydrogen on the surface of cellulose molecules to generate free radicals on the surface of cellulose, thereby initiating the grafting reaction of acrylamide monomers on the surface of cellulose.
Preferably, the volume ratio of water to ethanol in the alcohol is 7-8: 3.
Preferably, the mass fraction of acrylamide in the mixed solution is 45-50%.
Preferably, the photoinitiator is TPO; in the mixed solution, the mass fraction of TPO is 2.5-3.5%.
Preferably, the wavelength of the ultraviolet light is 360-365 nm, and the irradiation time of the ultraviolet light is 3.5-4 h.
By controlling the volume ratio of water to ethanol in alcohol, the dosage of acrylamide and photoinitiator, and the wavelength and irradiation time of ultraviolet light, the grafting rate can be improved as much as possible, so that the air permeability of the lining paper is reduced, and the stiffness of the lining paper is improved.
Compared with the prior art, the invention has the following advantages: according to the invention, the polyhydroxy hyperbranched polymer is added in the lining paper, and the acrylamide is grafted on the surface of the lining paper, so that the air permeability of the lining paper can be reduced, the lining paper can be sucked by the vacuum chuck, the stiffness of the lining paper can be improved, and the lining paper is not easy to fold in the taking and placing process, therefore, the lining paper can be better suitable for automatic paper taking of an intelligent manipulator.
Detailed Description
The present invention will be further described with reference to the following examples.
General examples
Preparing CTP plate lining paper by the following method:
(1) preparing polyhydroxy hyperbranched polymer:
(1.1) dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine under the protection of inert gas, and fully reacting; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product; the mass ratio of the pyromellitic dianhydride to the 2, 2' -dihydroxy dipropylamine is 1: 4.1-4.6;
(1.2) mixing the product obtained in the step (1.1) with glyceric acid according to the mass ratio of 1: 400-450, adding an esterification catalyst, and reacting for 4-5 hours at 160-170 ℃ under the protection of inert gas and under the pressure of 0.02-0.08 kPa; after the reaction is finished, adding methanol for full dissolution, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer; the esterification catalyst is p-toluenesulfonic acid, and the dosage of the esterification catalyst is 2-2.5% of the total mass of the product obtained in the step (1.1) and glyceric acid;
(2) mixing hardwood pulp and softwood pulp according to the mass ratio of 1: 3-5, pulping, and then beating until the beating degree is 50-60 DEG SR;
(3) adding the polyhydroxy hyperbranched polymer prepared in the step (1) into the pulped slurry, and mixing and stirring to obtain mixed slurry; the using amount of the polyhydroxy hyperbranched polymer is 1-1.5% of the total dry weight of the softwood pulp and the hardwood pulp;
(4) diluting the mixed slurry, screening, forming a net part to obtain wet paper, and then squeezing, dehydrating and drying;
(5) and (3) carrying out calendaring after the surface of the dried paper is wetted by spraying, and then drying again to obtain the low-air-permeability CTP plate lining paper.
Optionally, in step (3), after the web portion is formed, acrylamide is grafted to the surface of the wet paper, and the grafting step is as follows: dissolving acrylamide and a photoinitiator in alcohol to obtain a mixed solution; spraying the mixed solution onto the surface of wet paper in a spraying mode, and carrying out grafting reaction under the irradiation of ultraviolet light. In the alcohol, the volume ratio of water to ethanol is 7-8: 3; in the mixed solution, the mass fraction of acrylamide is 45-50%; the photoinitiator is TPO, and the mass fraction of the photoinitiator in the mixed solution is 2.5-3.5%; the wavelength of the ultraviolet light is 360-365 nm, and the irradiation time of the ultraviolet light is 3.5-4 h.
Example 1
Preparing CTP plate lining paper by the following method:
(1) preparing polyhydroxy hyperbranched polymer:
(1.1) dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine under the protection of inert gas, and fully reacting until a characteristic peak of cyclic anhydride disappears; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product; the mass ratio of the pyromellitic dianhydride to the 2, 2' -dihydroxydipropylamine is 1: 4.1;
(1.2) mixing the product obtained in the step (1.1), glyceric acid and p-toluenesulfonic acid according to the mass ratio of 1:400:8.02, adding p-toluenesulfonic acid, and reacting for 4 hours at 160 ℃ under 0.08kPa under the protection of inert gas; after the reaction is finished, adding methanol for full dissolution, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer;
(2) putting hardwood pulp and softwood pulp into a hydrapulper for pulping according to the mass ratio of 1:4, and then pulping in a tandem double-disc mill until the beating degree is 50 DEG SR;
(3) adding the polyhydroxy hyperbranched polymer prepared in the step (1) into the pulped slurry, and mixing and stirring to obtain mixed slurry; the dosage of the polyhydroxy hyperbranched polymer is 1 percent of the total dry weight of the softwood pulp and the hardwood pulp;
(4) diluting the mixed slurry, screening, forming a net part to obtain wet paper, and then squeezing, dehydrating and drying;
(5) after the surface of the dried paper is wetted by spraying, calendering the paper by using a controllable partition double-channel calender, and then drying the paper again to obtain raw paper;
(6) and (5) rewinding, trimming, slitting and packaging the base paper obtained in the step (5) to obtain the CTP plate lining paper.
Example 2
Preparing CTP plate lining paper by the following method:
(1) preparing polyhydroxy hyperbranched polymer:
(1.1) dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine under the protection of inert gas, and fully reacting until a characteristic peak of cyclic anhydride disappears; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product; the mass ratio of the pyromellitic dianhydride to the 2, 2' -dihydroxydipropylamine is 1: 4.3;
(1.2) mixing the product obtained in the step (1.1), glyceric acid and p-toluenesulfonic acid according to the mass ratio of 1:425:9.8, adding p-toluenesulfonic acid, and reacting for 4.5 hours at 165 ℃ under 0.05kPa under the protection of inert gas; after the reaction is finished, adding methanol for full dissolution, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer;
(2) putting hardwood pulp and softwood pulp into a hydrapulper for pulping according to the mass ratio of 1:4, and then pulping in a tandem double-disc mill until the beating degree is 55-degree SR;
(3) adding the polyhydroxy hyperbranched polymer prepared in the step (1) into the pulped slurry, and mixing and stirring to obtain mixed slurry; the dosage of the polyhydroxy hyperbranched polymer is 1.3 percent of the total dry weight of the softwood pulp and the hardwood pulp;
(4) diluting the mixed slurry, screening, forming a net part to obtain wet paper, and then squeezing, dehydrating and drying;
(5) after the surface of the dried paper is wetted by spraying, calendering the paper by using a controllable partition double-channel calender, and then drying the paper again to obtain raw paper;
(6) and (5) rewinding, trimming, slitting and packaging the base paper obtained in the step (5) to obtain the CTP plate lining paper.
Example 3
Preparing CTP plate lining paper by the following method:
(1) preparing polyhydroxy hyperbranched polymer:
(1.1) dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine under the protection of inert gas, and fully reacting until a characteristic peak of cyclic anhydride disappears; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product; the mass ratio of the pyromellitic dianhydride to the 2, 2' -dihydroxydipropylamine is 1: 4.6;
(1.2) mixing the product obtained in the step (1.1), glyceric acid and p-toluenesulfonic acid according to the mass ratio of 1:450:11.27, adding p-toluenesulfonic acid, and reacting for 5 hours at 170 ℃ under 0.02kPa under the protection of inert gas; after the reaction is finished, adding methanol for full dissolution, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer;
(2) putting hardwood pulp and softwood pulp into a hydrapulper for pulping according to the mass ratio of 1:4, and then pulping in a tandem double-disc mill until the beating degree is 60 DEG SR;
(3) adding the polyhydroxy hyperbranched polymer prepared in the step (1) into the pulped slurry, and mixing and stirring to obtain mixed slurry; the dosage of the polyhydroxy hyperbranched polymer is 1.5 percent of the total dry weight of the softwood pulp and the hardwood pulp;
(4) diluting the mixed slurry, screening, forming a net part to obtain wet paper, and then squeezing, dehydrating and drying;
(5) after the surface of the dried paper is wetted by spraying, calendering the paper by using a controllable partition double-channel calender, and then drying the paper again to obtain raw paper;
(6) and (5) rewinding, trimming, slitting and packaging the base paper obtained in the step (5) to obtain the CTP plate lining paper.
Example 4
Preparing CTP plate lining paper by the following method:
(1) preparing polyhydroxy hyperbranched polymer:
(1.1) dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine under the protection of inert gas, and fully reacting until a characteristic peak of cyclic anhydride disappears; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product; the mass ratio of the pyromellitic dianhydride to the 2, 2' -dihydroxydipropylamine is 1: 4.1;
(1.2) mixing the product obtained in the step (1.1), glyceric acid and p-toluenesulfonic acid according to the mass ratio of 1:300:6.02, adding p-toluenesulfonic acid, and reacting for 3 hours at 150 ℃ under 0.1kPa under the protection of inert gas; after the reaction is finished, adding methanol for full dissolution, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer;
(2) putting hardwood pulp and softwood pulp into a hydrapulper for pulping according to the mass ratio of 1:4, and then pulping in a tandem double-disc mill until the beating degree is 50 DEG SR;
(3) adding the polyhydroxy hyperbranched polymer prepared in the step (1) into the pulped slurry, and mixing and stirring to obtain mixed slurry; the dosage of the polyhydroxy hyperbranched polymer is 1 percent of the total dry weight of the softwood pulp and the hardwood pulp;
(4) diluting the mixed slurry, screening, forming a net part to obtain wet paper, and then squeezing, dehydrating and drying;
(5) after the surface of the dried paper is wetted by spraying, calendering the paper by using a controllable partition double-channel calender, and then drying the paper again to obtain raw paper;
(6) and (5) rewinding, trimming, slitting and packaging the base paper obtained in the step (5) to obtain the CTP plate lining paper.
Example 5
Preparing CTP plate lining paper by the following method:
(1) preparing polyhydroxy hyperbranched polymer:
(1.1) dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine under the protection of inert gas, and fully reacting until a characteristic peak of cyclic anhydride disappears; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product; the mass ratio of the pyromellitic dianhydride to the 2, 2' -dihydroxydipropylamine is 1: 4.6;
(1.2) mixing the product obtained in the step (1.1), glyceric acid and p-toluenesulfonic acid according to the mass ratio of 1:550:13.77, adding p-toluenesulfonic acid, and reacting for 6 hours at 180 ℃ under 0.01kPa under the protection of inert gas; after the reaction is finished, adding methanol for full dissolution, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer;
(2) putting hardwood pulp and softwood pulp into a hydrapulper for pulping according to the mass ratio of 1:4, and then pulping in a tandem double-disc mill until the beating degree is 60 DEG SR;
(3) adding the polyhydroxy hyperbranched polymer prepared in the step (1) into the pulped slurry, and mixing and stirring to obtain mixed slurry; the dosage of the polyhydroxy hyperbranched polymer is 1.5 percent of the total dry weight of the softwood pulp and the hardwood pulp;
(4) diluting the mixed slurry, screening, forming a net part to obtain wet paper, and then squeezing, dehydrating and drying;
(5) after the surface of the dried paper is wetted by spraying, calendering the paper by using a controllable partition double-channel calender, and then drying the paper again to obtain raw paper;
(6) and (5) rewinding, trimming, slitting and packaging the base paper obtained in the step (5) to obtain the CTP plate lining paper.
Example 6
Preparing CTP plate lining paper by the following method:
(1) preparing polyhydroxy hyperbranched polymer:
(1.1) dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine under the protection of inert gas, and fully reacting until a characteristic peak of cyclic anhydride disappears; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product; the mass ratio of the pyromellitic dianhydride to the 2, 2' -dihydroxydipropylamine is 1: 4.1;
(1.2) mixing the product obtained in the step (1.1), glyceric acid and p-toluenesulfonic acid according to the mass ratio of 1:400:8.02, adding p-toluenesulfonic acid, and reacting for 4 hours at 160 ℃ under 0.08kPa under the protection of inert gas; after the reaction is finished, adding methanol for full dissolution, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer;
(2) putting hardwood pulp and softwood pulp into a hydrapulper for pulping according to the mass ratio of 1:4, and then pulping in a tandem double-disc mill until the beating degree is 50 DEG SR;
(3) adding the polyhydroxy hyperbranched polymer prepared in the step (1) into the pulped slurry, and mixing and stirring to obtain mixed slurry; the dosage of the polyhydroxy hyperbranched polymer is 1 percent of the total dry weight of the softwood pulp and the hardwood pulp;
(4) diluting the mixed slurry, screening and forming a net part to obtain wet paper;
(5) and (3) grafting acrylamide on the surface of the wet paper: preparing alcohol from water and ethanol with a volume ratio of 8:3, dissolving acrylamide and TPO in the alcohol to prepare a mixed solution, wherein the mass fractions of the acrylamide and the TPO are 50% and 3%, respectively; spraying the mixed solution onto the surface of wet paper in a spray form, and reacting for 4h under the irradiation of ultraviolet light with the wavelength of 360 nm;
(6) squeezing, dewatering and drying the wet paper;
(7) after the surface of the dried paper is wetted by spraying, calendering the paper by using a controllable partition double-channel calender, and then drying the paper again to obtain raw paper;
(8) and (5) rewinding, trimming, slitting and packaging the base paper obtained in the step (7) to obtain the CTP plate lining paper.
Comparative example 1
Preparing CTP plate lining paper by the following method:
(1) putting hardwood pulp and softwood pulp into a hydrapulper for pulping according to the mass ratio of 1:4, and then pulping in a tandem double-disc mill until the beating degree is 50 DEG SR;
(2) diluting, screening and net part forming the pulp after pulping to obtain wet paper, and then squeezing, dehydrating and drying;
(3) after the surface of the dried paper is wetted by spraying, calendering the paper by using a controllable partition double-channel calender, and then drying the paper again to obtain raw paper;
(4) and (4) rewinding, trimming, slitting and packaging the base paper obtained in the step (3) to obtain the CTP plate lining paper.
Comparative example 2
Preparing CTP plate lining paper by the following method:
(1) preparing polyhydroxy hyperbranched polymer:
(1.1) dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine under the protection of inert gas, and fully reacting until a characteristic peak of cyclic anhydride disappears; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product; the mass ratio of the pyromellitic dianhydride to the 2, 2' -dihydroxydipropylamine is 1: 4.6;
(1.2) mixing the product obtained in the step (1.1), glyceric acid and p-toluenesulfonic acid according to the mass ratio of 1:450:11.27, adding p-toluenesulfonic acid, and reacting for 5 hours at 170 ℃ under 0.02kPa under the protection of inert gas; after the reaction is finished, adding methanol for full dissolution, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer;
(2) putting hardwood pulp and softwood pulp into a hydrapulper for pulping according to the mass ratio of 1:4, and then pulping in a tandem double-disc mill until the beating degree is 60 DEG SR;
(3) adding the polyhydroxy hyperbranched polymer prepared in the step (1) into the pulped slurry, and mixing and stirring to obtain mixed slurry; the dosage of the polyhydroxy hyperbranched polymer is 2.5 percent of the total dry weight of the softwood pulp and the hardwood pulp;
(4) diluting the mixed slurry, screening, forming a net part to obtain wet paper, and then squeezing, dehydrating and drying;
(5) after the surface of the dried paper is wetted by spraying, calendering the paper by using a controllable partition double-channel calender, and then drying the paper again to obtain raw paper;
(6) and (5) rewinding, trimming, slitting and packaging the base paper obtained in the step (5) to obtain the CTP plate lining paper.
The CTP lining paper prepared in the examples 1-6 and the comparative examples 1-2 was tested for tensile strength, air permeability, tightness and granularity, and the results are shown in Table 1. When the thickness of the paper is the same, the stiffness of the paper is positively correlated with the tightness, and the thickness of the paper is controlled to be close in the process of preparing CTP plate lining paper in examples 1-4 and comparative examples 1-4, so the stiffness can be represented by the tightness.
TABLE 1
Figure BDA0002482287990000091
Figure BDA0002482287990000101
Comparative example 1 is different from example 1 in that example 1 has polyhydroxy hyperbranched polymer added to CTP plate lining paper, and comparative example 1 has no such polymer added, and other conditions are the same. As shown in table 1, compared to comparative example 1, the CTP plate liner paper prepared in example 1 has significantly increased tightness and tensile strength and reduced air permeability and granularity. The reason for this may be: hydroxyl in the polyhydroxy hyperbranched polymer can form hydrogen bonds with hydroxyl in cellulose, so that the number of the hydrogen bonds naturally formed in a bonding area among fibers is supplemented, and the bonding strength among the fibers is improved; the polyhydroxy hyperbranched polymer has a large number of branched chains, and hydroxyl groups in the cellulose are combined with hydroxyl groups on each branched chain, so that the cellulose and the polyhydroxy hyperbranched polymer are highly crosslinked, and the crosslinking degree between fibers is increased; in addition, the polyhydroxy hyperbranched polymer also plays a role of a dispersant, so that the fibers are dispersed more uniformly, thereby increasing the binding points among the fibers and between the fibers and the molecules of the polyhydroxy hyperbranched polymer and further increasing the crosslinking degree of the fibers. The increase of the bonding strength between the fibers can increase the tensile strength of the lining paper; the air permeability of the lining paper can be reduced and the stiffness of the lining paper can be improved by increasing the crosslinking degree among the fibers; the granularity that the fibre dispersion then can reduce the slip sheet more even makes slip sheet surface more level and smooth, prevents to cause wearing and tearing to the sensitization picture layer on CTP version surface.
Example 4 is different from example 1 in that in example 4, the relative amount of glyceric acid is reduced, the temperature and time of the polycondensation reaction are reduced, the gas pressure of the polycondensation reaction is increased, and other conditions are the same in the process of preparing the polyhydroxy hyperbranched polymer. As seen from table 1, the CTP plate interleaving paper prepared in example 4 has reduced tensile strength and tightness and increased air permeability as compared to example 1. The reason for this may be: the polyhydroxyl hyperbranched polymer obtained in example 4 has a lower molecular weight, resulting in a lower degree of crosslinking of the cellulose and thus in greater air permeability and lower stiffness and tensile strength of the lining paper.
Example 5 differs from example 3 in that in example 5, the relative amount of glyceric acid is increased, the temperature and time of the polycondensation reaction are increased, and the gas pressure of the polycondensation reaction is reduced, all other conditions being the same. As seen from table 1, the CTP plate interleaving paper prepared in example 5 has reduced tensile strength and tightness and increased air permeability as compared to example 3. The reason for this may be: the polyhydroxy hyperbranched polymer prepared in example 5 has too high molecular weight, and polymer molecular chains are entangled and cannot be effectively combined with cellulose, so that the lining paper has high air permeability and low stiffness and tensile strength.
A combined analysis of example 4 and example 5 can lead to the conclusion that: the molecular weight of the polyhydroxy hyperbranched polymer needs to be controlled within a reasonable range, and the overlarge molecular weight and the undersize molecular weight can increase the air permeability of the CTP lining paper, so that the CTP lining paper cannot be absorbed by a vacuum chuck, and simultaneously, the stiffness of the lining paper can be reduced, so that the CTP lining paper is easy to fold in the automatic taking and placing process, and the tensile strength of the lining paper is reduced, so that the CTP lining paper is easy to be pulled and stretched in the taking, placing and using processes.
The difference between the comparative example 2 and the example 3 is that the addition amount of the polyhydroxy hyperbranched polymer in the comparative example 2 is larger, and other conditions are the same. As seen from table 1, the CTP lining paper prepared in comparative example 2 has no significant increase in the tightness and tensile strength, and no significant decrease in the air permeability, but has an increased granularity, compared to example 1. This shows that when the addition amount of the polyhydroxy hyperbranched polymer is increased to a certain value, the addition amount is increased, and the air permeability of the lining paper is not obviously reduced; furthermore, with the increase of the addition amount of the polyhydroxy hyperbranched polymer, the problem of pasting is easily caused during the paper making, the forming of the lining paper is influenced, and the evenness of the lining paper is further influenced. Therefore, if the air permeability of the interleaving paper needs to be further reduced, a method other than adding the polyhydric hyperbranched polymer is required.
Example 6 differs from example 1 in that in example 6, the surface of the wet sheet was grafted with acrylamide after the web portion was formed, but in example 1, acrylamide was not grafted, and the other conditions were the same. As shown in table 1, compared to example 1, the CTP plate interleaving paper obtained in example 6 has significantly improved tightness and tensile strength, and significantly reduced air permeability and granularity. The reason for this may be: in example 6, part of the acrylamide was grafted onto the fibers in the form of monomers and part was grafted in the form of homopolymers; the acrylamide monomers on the surfaces of the fibers are adhered to ensure that the fibers are tightly contacted, so that the air permeability of the lining paper is reduced, and the stiffness and the tensile strength are improved; meanwhile, the polyacrylamide chains are tangled, and a net structure is formed on the surface of the lining paper to prevent air circulation, so that the air permeability of the lining paper is reduced.
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.

Claims (9)

1. A low-air permeability CTP plate lining paper is characterized in that raw materials comprise softwood pulp, hardwood pulp and polyhydroxy hyperbranched polymer; the mass ratio of the hardwood pulp to the softwood pulp is 1: 3-5; the dosage of the polyhydroxy hyperbranched polymer is 1-1.5% of the total dry weight of softwood pulp and hardwood pulp; the preparation process of the polyhydroxy hyperbranched polymer comprises the following steps:
(a) under the protection of inert gas, dropwise adding a dimethylacetamide solution of pyromellitic dianhydride into a dimethylacetamide solution of 2, 2' -dihydroxydipropylamine for sufficient reaction; after the reaction is finished, adding toluene to precipitate a reaction product, filtering, and rotatably evaporating filter residues to obtain a product;
(b) mixing the product obtained in the step (a) with glyceric acid and an esterification catalyst, wherein the mass ratio of the product obtained in the step (a) to the glyceric acid is 1: 400-450, and performing polycondensation reaction under the protection of inert gas; after the reaction is finished, adding methanol to fully dissolve, adding ether to precipitate a reaction product, filtering, and drying filter residues to obtain the polyhydroxy hyperbranched polymer.
2. The low permeability CTP plate liner paper of claim 1, wherein the starting material further comprises acrylamide.
3. The CTP plate lining paper of claim 1, wherein in the step (a), the mass ratio of pyromellitic dianhydride to 2, 2' -dihydroxydipropylamine is 1: 4.1-4.6.
4. The CTP lining paper as claimed in claim 1, wherein in step (b), the polycondensation reaction is carried out at 160-170 ℃ under 0.02-0.08 kPa for 4-5 h.
5. The low air permeability CTP plate liner paper of claim 1, wherein in step (b), the esterification catalyst is p-toluenesulfonic acid; the dosage of the p-toluenesulfonic acid is 2-2.5% of the total mass of the product obtained in the step (a) and glyceric acid.
6. The method for preparing the CTP lining paper with low air permeability as claimed in any one of claims 1 to 4, comprising the following steps:
(1) mixing softwood pulp and hardwood pulp, pulping, and beating until the beating degree is 50-60 DEG SR;
(2) adding the polyhydroxy hyperbranched polymer into the pulped slurry, and mixing and stirring to obtain mixed slurry;
(3) diluting the mixed slurry, screening, forming a net part to obtain wet paper, and then squeezing, dehydrating and drying;
(4) and (3) carrying out calendaring after the surface of the dried paper is wetted by spraying, and then drying again to obtain the low-air-permeability CTP plate lining paper.
7. The method for preparing a CTP lining paper with low air permeability as claimed in claim 6, wherein in step (3), after the net part is formed, acrylamide is grafted on the surface of the wet paper.
8. The method for preparing the CTP lining paper with low air permeability as claimed in claim 7, wherein the step of grafting acrylamide on the surface of the wet paper is as follows: dissolving acrylamide and a photoinitiator in alcohol to obtain a mixed solution; spraying the mixed solution onto the surface of wet paper in a spraying mode, and carrying out grafting reaction under the irradiation of ultraviolet light.
9. The method for preparing a low air permeability CTP plate lining paper as claimed in claim 8, wherein the method comprises the following steps:
in the alcohol, the volume ratio of water to ethanol is 7-8: 3;
in the mixed solution, the mass fraction of acrylamide is 45-50%;
the photoinitiator is TPO, and the mass fraction of TPO in the mixed solution is 2.5-3.5%;
the wavelength of the ultraviolet light is 360-365 nm, and the irradiation time of the ultraviolet light is 3.5-4 h.
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