CN110528305B - Preparation method of liquid crystal glass substrate spacer paper with seersucker structure - Google Patents

Preparation method of liquid crystal glass substrate spacer paper with seersucker structure Download PDF

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CN110528305B
CN110528305B CN201910831669.8A CN201910831669A CN110528305B CN 110528305 B CN110528305 B CN 110528305B CN 201910831669 A CN201910831669 A CN 201910831669A CN 110528305 B CN110528305 B CN 110528305B
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paper
pulp
liquid crystal
glass substrate
crystal glass
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CN110528305A (en
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赵传山
李杰华
李辉
韩文佳
姜亦飞
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Qilu University of Technology
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/02—Methods of beating; Beaters of the Hollander type
    • 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
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • 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
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/04—Kraft or sulfate 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; Derivatives thereof
    • 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

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  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Abstract

The invention relates to a preparation method of liquid crystal glass substrate partition paper with a 'seersucker' structure, belonging to the paper making technology. The paper is prepared by blending bleached softwood pulp and bleached hardwood pulp, the pulping adopts a fiber mild defibering mode, the nanofiber material is added into the mixed pulp in a pulp adding mode, and the treatment is carried out by adopting a light-pressure high-temperature quick drying mode. The invention solves the problem that the high strength, the high stiffness and the high air permeability of the liquid crystal glass substrate spacer paper can not be considered under the low beating degree of the sizing agent, simultaneously has higher bulk and forms a 'seersucker' structure which is microscopically smooth and macroscopically not very smooth, and increases the air permeability and the long-term anti-mildew performance of the liquid crystal glass substrate spacer paper.

Description

Preparation method of liquid crystal glass substrate spacer paper with seersucker structure
Technical Field
The invention relates to a preparation method of liquid crystal glass substrate partition paper with a 'seersucker' structure, in particular to a preparation method of liquid crystal glass substrate partition paper with a 'seersucker' structure, which has high strength, high stiffness and high air permeability, and belongs to the technical field of paper making.
Background
The liquid crystal glass spacing paper is used as the spacing paper among various liquid crystal screens, and plays an important role in protection and isolation in the transportation process of the flat-panel display. When the liquid crystal screen is transported and stored for a long time, the liquid crystal glass spacer paper can be mildewed due to factors such as environmental humidity change and the like, and then the liquid crystal glass substrate is corroded, so that the expensive liquid crystal glass substrate is damaged. Therefore, the paper is generally required to have higher air permeability, smooth and fine surface, no hair and powder falling, no dust and impurity and high surface strength. The liquid crystal glass spacer paper has high air permeability, air circulation between the liquid crystal glass substrates is smooth, and the mildew probability is reduced. Since the 21 st century, the market demand for various intelligent devices is developing in a light and thin convenient direction, and enterprises are prompted to optimize the process and improve the technology of glass-based panels, the products of novel display technologies and related industries are reported to account for more than 30% of the total output value of the information industry, and the LCD industry can keep about 10% of the growth rate in the coming decade of China. The demand for the spacer paper between the liquid crystal glass substrates is increasing.
The liquid crystal glass substrate partition paper is used for rear section packaging of glass products at intervals, and also can be used for glass and glass spacers after glass substrates are cut or thinned, the liquid crystal glass substrate partition paper is used as one of the glass partition paper, and is required to have higher air permeability, higher strength, higher stiffness, no dust and impurities, no fluff and dust fall, fine and smooth surface, no scratch to the surface of glass, and no mildew after long-time storage.
Chinese patent document CN 109137623A (application No. 201811182722.8) discloses a TFT-LCD substrate glass front-section spacing paper and a manufacturing method thereof, which belongs to the papermaking technology and is prepared by using 3-4 types of softwood pulp in a compatible manner, wherein the content of southern pine in the United states is 45-65% by mass, the content of Yunnan Cistus incarnata spongiosa is 10-25% by mass, the content of fir in Canada is 10-25% by mass, the content of Brazilian eucalyptus pulp is 0-15% by mass, and the mixed fiber raw material is subjected to free pulping until the pulp degree is 19 DEG SR-21 DEG SR and the wet weight is 14-16 g; adding 1-3% of aluminum sulfate to adjust the pH value; adding 1-2% of mildew preventive; and then the paper is prepared by combining various measures through a wet paper making process. According to the invention, no adhesive is used, the respective unique properties of different producing areas of softwood pulp are utilized, and the product ration is 35-60 g/m2Tensile strength of more than 2.5KN/m and thickness of more than 2cm3(g) air permeability of 10-15L/m2S, stiffness greater than 12KN/m, ash less than 0.1%, extraction with dichloromethaneThe content of the product is less than 0.05 percent. The technical scheme has the problems of complex raw materials, high cost, unstable product quality and the like, and related indexes cannot reach the performance of similar foreign products.
Chinese patent document CN106758482A (application No. 201611267767.6) discloses a high-stiffness glass partition paper and a manufacturing method thereof, belonging to the papermaking technology, wherein bleached sulfate softwood pulp and GP pulp are used as fiber raw materials and are mixed together, the mass percentage content of the GP pulp is 45-55%, and the balance is the bleached sulfate softwood pulp; circularly pulping the mixed fiber raw material until the pulp degree is 19-21 DEG SR and the wet weight is 14-16 g; and then sequentially carrying out dewatering forming, pressing dewatering, surface sizing, secondary drying, press polishing and reeling by a fourdrinier machine to prepare the high-stiffness glass partition paper. Although the stiffness and the tightness of the product prepared by the scheme are obviously improved, the performance of the same type of foreign products cannot be achieved, and the air permeability of the finished paper cannot meet the requirement.
Xuyongjian et al, in the research on the manufacturing process of liquid crystal glass partition paper (the 10 th volume of 2017, volume 36), disclose that a liquid crystal glass partition paper is prepared from softwood pulp with a beating degree of 32 DEG SR and hardwood pulp with a beating degree of 22 DEG SR according to a ratio of 20:80, and a debonding agent is added to improve the air permeability of the finished paper, but the corresponding wet paper web strength and the finished paper tightness are both obviously reduced.
Disclosure of Invention
Aiming at the problems that the high strength, the high stiffness and the high air permeability are mutually contradictory and cannot be considered at the same time, the invention provides the manufacturing method of the liquid crystal glass substrate partition paper, which is simple to operate and moderate in cost and is used for obtaining the liquid crystal glass substrate partition paper with excellent quality, high strength, high stiffness and high air permeability.
The technical scheme of the invention is as follows:
a preparation method of liquid crystal glass substrate spacer paper with a 'seersucker' structure comprises the following steps:
(1) pulping the disintegrated native softwood pulp and native hardwood pulp respectively to prepare softwood pulp and hardwood pulp respectively;
(2) mixing 50-70% of softwood pulp and 30-50% of hardwood pulp in percentage by mass uniformly to prepare mixed pulp;
(3) adding a nanofiber material reinforcing agent into the mixed slurry prepared in the step (2), wherein the addition amount of the nanofiber material reinforcing agent is 0.3-2% of the mass of the mixed slurry;
(4) and squeezing and dehydrating the wet paper web by adopting a continuous light pressing mode, and then drying, carrying out surface acidification treatment, carrying out secondary drying, and carrying out press polish coiling to obtain the wet paper web.
According to the invention, the beating treatment in the step (1) adopts a circulating reflux mode to carry out light beating treatment of light knife defibering and proper cutting.
According to the invention, the raw softwood pulp in step (1) is bleached softwood pulp prepared by a chemical method, a semi-chemical method or a chemical-mechanical method.
Preferably according to the invention, the raw hardwood pulp in step (1) is bleached hardwood pulp produced by a chemical or semi-chemical or chemimechanical process.
According to the invention, the beating degree of the raw softwood pulp in the step (1) is 20-30 DEG SR; the beating degree of the native broad-leaved wood pulp is 18-25 DEG SR; further preferably, the beating degree of the raw softwood pulp in the step (1) is between 20 and 25 degrees SR; the beating degree of the primary hardwood pulp is 20-25 DEG SR.
According to the invention, the content of the softwood pulp in the step (2) is 60-70% by mass, and the content of the hardwood pulp in the step (2) is 30-40% by mass.
According to the invention, the nano fiber material reinforcing agent in the step (3) has the advantages of nano scale, length-diameter ratio of 30-100 and specific surface area of 3000-8000. The nanofiber material meeting the requirements can expose more hydroxyl groups, and forms hydrogen bond combination with paper-based fibers, so that the strength is better.
Preferably, according to the present invention, the reinforcing agent for nanofiber material in the step (3) is biomass nanofiber; further preferably, the biomass nanofibers comprise mechanically made nanofibers and/or chemically made nanofibers; more preferably, the biomass nanofibers are softwood nanofibers, hardwood nanofibers and/or bacterial cellulose.
The biomass nanofiber is added into the paper pulp fiber in a form of adding the biomass nanofiber into pulp, the bonding force of the paper pulp fiber is improved by utilizing the hydrogen bond enhancing property of the nanofiber, and the nanofiber can improve the paper forming strength, stiffness and air permeability of the spacer paper between the liquid crystal glass substrates under the condition of low beating degree; meanwhile, the nano-fiber replaces an organic reinforcing agent, so that the existence of organic colloid in the paper making process is reduced, and the pollution of the liquid crystal glass substrate caused by the glass spacer paper is prevented.
According to the invention, in the step (4), the pressing dehydration step can ensure that the dryness of the paper is 30-45%.
According to the invention, the press dewatering in the step (4) is preferably a continuous light press.
According to the invention, the drying in the step (4) is preferably a high-temperature quick drying mode; further preferably, the drying cylinder temperature is 100-110 ℃.
According to the preferable selection of the invention, the surface acidification treatment in the step (4) is carried out by adopting a surface sizing method, the acid auxiliary agent is citric acid, the mass percentage concentration is 1-6%, and the pH value of the paper is 4-6; further preferably, the pH value of the paper is 5-6;
the secondary drying is drying by adopting a conventional drying method, and 3-4 cooling cylinders are arranged behind the drying method for cooling to assist in eliminating static electricity.
According to the invention, preferably, in the step (4), calendering and winding are carried out, after the paper is calendered, a static eliminator is arranged to eliminate static electricity, and then winding is carried out.
A liquid crystal glass substrate partition paper with a 'seersucker' structure has the following physical and chemical indexes:
the quantitative ratio is 30-60 g/m2Bulk of 1.3-1.8 cm3The tensile strength of the composite material is 3-5 KN/m in the longitudinal direction, 2-5 KN/m in the transverse direction, 20-50 mN in the longitudinal direction, 15-40 mN in the transverse direction and 150-220 um/Pa.s in air permeability.
According to the inventionObviously, other physical and chemical indexes of the liquid crystal glass substrate spacer paper are as follows: the whiteness is 70% -90%, the smoothness of the front side is 15-40 s, the smoothness of the back side is 15-40 s, and the dust degree is 5-20/m2And 4-8% of water.
Advantageous effects
1. According to the invention, the softwood pulp and the hardwood pulp are used as raw materials for the first time, and the nanofiber material is added at the same time, so that the liquid crystal glass substrate partition paper with a seersucker structure is prepared, and through actual detection, three mutually-restricted indexes of the prepared product, namely, the strength, the stiffness and the air permeability, are remarkably improved, so that the product performance is superior to that of similar foreign products;
2. when the softwood pulp and the hardwood pulp are mixed according to the specific beating degree and the specific proportion, all parameter indexes of the prepared liquid crystal glass substrate spacer paper are more balanced, and all necessary indexes of the liquid crystal glass substrate spacer paper are obviously superior to those of similar foreign products;
3. the invention adopts quick drying treatment for the first time in the preparation process, the step can improve the bulk of the finished paper and form a 'seersucker' structure which is microscopically smooth and macroscopically not very smooth, the air permeability of the finished paper is obviously improved, and the phenomenon that the liquid crystal glass substrate is mildewed is avoided;
4. in the preparation process, no non-fibrous filler and organic chemical auxiliary agent are added, so that the preparation method is more environment-friendly and meets the policy requirements of energy conservation, emission reduction and environmental friendliness at present.
Detailed description of the invention
The technical solution of the present invention is further described with reference to the following examples, but the scope of the present invention is not limited thereto.
Source of raw materials
Both bleached sulfate softwood pulp and bleached sulfate hardwood pulp are common commercial products in the examples.
The nanofiber material reinforcing agent in the examples was softwood nanocellulose, prepared according to the TEMPO Cellulose oxidation method described in the Determination of nanocellulose fibrous length by shear sensitivity measurement (Tanaka et al, Cellulose 2014 6).
Example 1
A preparation method of liquid crystal glass substrate spacer paper with a 'seersucker' structure comprises the following steps:
(1) pulping: respectively carrying out pulping treatment on the two types of pulp which are already crushed, wherein the pulping mode adopts a circulating reflux mode to firstly carry out light cutter defibering and then carry out micro-pulping to cut off fibers, wherein the pulping degree of bleached sulfate softwood pulp is 20 DEG SR, and the pulping degree of bleached sulfate hardwood pulp is 20 DEG SR, so as to respectively prepare softwood pulp and hardwood pulp;
(2) mixing pulp, namely uniformly mixing 70% of softwood pulp and 30% of hardwood pulp to prepare mixed pulp;
(3) adding a nanofiber material: pumping the mixed slurry obtained in the step (2) into a slurry pool, and adding the softwood nano-cellulose, wherein the adding amount is 0.3% of the mass of the mixed slurry;
(4) squeezing: and (3) squeezing and dewatering the wet paper web in a continuous light-pressing mode to ensure that the dryness content of the paper is 35%.
(5) And (3) quick drying: and (4) carrying out quick drying treatment on the paper dehydrated in the step (4), wherein the drying cylinder temperature is 100 ℃.
(6) Surface treatment: and (3) acidizing the dried paper by using a surface sizing method, wherein the acid auxiliary agent is citric acid, the concentration is 3%, and the pH value of the paper is 5.5.
(7) Secondary drying: and (4) drying the paper subjected to surface treatment in the step (6) by adopting a conventional drying method, and arranging 4 cooling cylinders for cooling to assist in eliminating static electricity.
(8) Calendering and coiling: and (4) calendaring the paper dried in the step (7), then reeling, arranging a static eliminator before reeling to eliminate static electricity, and preparing finished product liquid crystal glass substrate partition paper with the water content of 6%.
The physical indexes of the liquid crystal glass substrate spacer paper prepared in this example are as follows:
Figure GDA0003243715220000071
example 2
A preparation method of liquid crystal glass substrate spacer paper with a 'seersucker' structure comprises the following steps:
(1) pulping: respectively carrying out pulping treatment on the two types of pulp which are already crushed, wherein the pulping mode adopts a circulating reflux mode to firstly carry out light cutter defibering and then carry out micro-pulping to cut off fibers, wherein the pulping degree of bleached sulfate softwood pulp is 25 DEG SR, and the pulping degree of bleached sulfate hardwood pulp is 25 DEG SR, so as to respectively prepare softwood pulp and hardwood pulp;
(2) mixing pulp, namely uniformly mixing 60 percent of softwood pulp and 40 percent of hardwood pulp to prepare mixed pulp;
(3) adding a nanofiber material: pumping the mixed slurry obtained in the step (2) into a slurry pool, and adding the softwood nano-cellulose, wherein the adding amount is 0.3% of the mass of the mixed slurry;
(4) squeezing: and (3) squeezing and dewatering the wet paper web in a continuous light-pressing mode to ensure that the dryness content of the paper is 35%.
(5) And (3) quick drying: and (4) carrying out quick drying treatment on the paper dehydrated in the step (4), wherein the drying cylinder temperature is 100 ℃.
(6) Surface treatment: and (3) acidizing the dried paper by using a surface sizing method, wherein the acid auxiliary agent is citric acid, the concentration is 3 percent, and the pH value of the paper is 5.3.
(7) Secondary drying: and (4) drying the paper subjected to surface treatment in the step (6) by adopting a conventional drying method, and arranging 4 cooling cylinders for cooling to assist in eliminating static electricity.
(8) Calendering and coiling: and (4) calendaring the paper dried in the step (7), then reeling, arranging a static eliminator before reeling to eliminate static electricity, and preparing finished product liquid crystal glass substrate partition paper with the water content of 6%.
The physical indexes of the liquid crystal glass substrate spacer paper prepared in this example are as follows:
Figure GDA0003243715220000081
Figure GDA0003243715220000091
example 3
A preparation method of liquid crystal glass substrate spacer paper with a 'seersucker' structure comprises the following steps:
(1) pulping: respectively carrying out pulping treatment on the two types of pulp which are already crushed, wherein the pulping mode adopts a circulating reflux mode to firstly carry out light cutter defibering and then carry out micro-pulping to cut off fibers, wherein the pulping degree of bleached sulfate softwood pulp is 25 DEG SR, and the pulping degree of bleached sulfate hardwood pulp is 20 DEG SR, and thus softwood pulp and hardwood pulp are respectively prepared;
(2) mixing pulp, namely uniformly mixing 60 percent of softwood pulp and 40 percent of hardwood pulp to prepare mixed pulp;
(3) adding a nanofiber material: pumping the mixed slurry obtained in the step (2) into a slurry pool, and adding the softwood nano-cellulose, wherein the adding amount is 1.5% of the mass of the mixed slurry;
(4) squeezing: and (3) squeezing and dewatering the wet paper web in a continuous light-pressing mode to ensure that the dryness content of the paper is 35%.
(5) And (3) quick drying: and (4) carrying out quick drying treatment on the paper dehydrated in the step (4), wherein the drying cylinder temperature is 105 ℃.
(6) Surface treatment: and (3) acidizing the dried paper by using a surface sizing method, wherein the acid auxiliary agent is citric acid, the concentration is 3%, and the pH value of the paper is 5.8.
(7) Secondary drying: and (4) drying the paper subjected to surface treatment in the step (6) by adopting a conventional drying method, and arranging 4 cooling cylinders for cooling to assist in eliminating static electricity.
(8) Calendering and coiling: and (4) calendaring the paper dried in the step (7), then reeling, arranging a static eliminator before reeling to eliminate static electricity, and preparing finished product liquid crystal glass substrate partition paper with the water content of 6%.
The physical indexes of the liquid crystal glass substrate spacer paper prepared in this example are as follows:
Figure GDA0003243715220000101
example 4
A preparation method of liquid crystal glass substrate spacer paper with a 'seersucker' structure comprises the following steps:
(1) pulping: respectively carrying out pulping treatment on the two types of pulp which are already crushed, wherein the pulping mode adopts a circulating reflux mode to firstly carry out light cutter defibering and then carry out micro-pulping to cut off fibers, wherein the pulping degree of bleached sulfate softwood pulp is 30 DEG SR, and the pulping degree of bleached sulfate hardwood pulp is 18 DEG SR, and thus softwood pulp and hardwood pulp are respectively prepared;
(2) mixing pulp, namely uniformly mixing 50% of softwood pulp and 50% of hardwood pulp to prepare mixed pulp;
(3) adding a nanofiber material: pumping the mixed slurry obtained in the step (2) into a slurry pool, and adding the softwood nano-cellulose, wherein the adding amount is 1.5% of the mass of the mixed slurry;
(4) squeezing: and (3) squeezing and dewatering the wet paper web in a continuous light-pressing mode to ensure that the dryness content of the paper is 35%.
(5) And (3) quick drying: and (4) carrying out quick drying treatment on the paper dehydrated in the step (4), wherein the drying cylinder temperature is 105 ℃.
(6) Surface treatment: and (3) acidizing the dried paper by using a surface sizing method, wherein the acid auxiliary agent is citric acid, the concentration is 3%, and the pH value of the paper is 5.8.
(7) Secondary drying: and (4) drying the paper subjected to surface treatment in the step (6) by adopting a conventional drying method, and arranging 4 cooling cylinders for cooling to assist in eliminating static electricity.
(8) Calendering and coiling: and (4) calendaring the paper dried in the step (7), then reeling, arranging a static eliminator before reeling to eliminate static electricity, and preparing finished product liquid crystal glass substrate partition paper with the water content of 6%.
The physical indexes of the liquid crystal glass substrate spacer paper prepared in this example are as follows:
Figure GDA0003243715220000111
Figure GDA0003243715220000121
example 5
A preparation method of liquid crystal glass substrate separation paper comprises the following steps:
(1) pulping: respectively carrying out pulping treatment on the two types of pulp which are already crushed, wherein the pulping mode adopts a circulating reflux mode to firstly carry out light cutter defibering and then carry out micro-pulping to cut off fibers, wherein the pulping degree of bleached sulfate softwood pulp is 32 DEG SR, and the pulping degree of bleached sulfate hardwood pulp is 22 DEG SR, and thus softwood pulp and hardwood pulp are respectively prepared;
(2) mixing pulp, namely uniformly mixing 20% of softwood pulp and 80% of hardwood pulp to prepare mixed pulp;
(3) adding a nanofiber material: pumping the mixed slurry obtained in the step (2) into a slurry pool, and adding the softwood nanofiber material, wherein the adding amount is 1.5% of the mass of the mixed slurry;
(4) squeezing: and (3) squeezing and dewatering the wet paper web in a continuous light-pressing mode to ensure that the dryness content of the paper is 35%.
(5) And (3) quick drying: and (4) carrying out quick drying treatment on the paper dehydrated in the step (4), wherein the drying cylinder temperature is 110 ℃.
(6) Surface treatment: and (3) acidizing the dried paper by using a surface sizing method, wherein the acid auxiliary agent is citric acid, the concentration is 3%, and the pH value of the paper is 5.8.
(7) Secondary drying: and (4) drying the paper subjected to surface treatment in the step (6) by adopting a conventional drying method, and arranging 4 cooling cylinders for cooling to assist in eliminating static electricity.
(8) Calendering and coiling: and (4) calendaring the paper dried in the step (7), then reeling, arranging a static eliminator before reeling to eliminate static electricity, and preparing finished product liquid crystal glass substrate partition paper with the water content of 6%.
The physical indexes of the liquid crystal glass substrate partition paper prepared by the comparative example are as follows:
Figure GDA0003243715220000131
comparative example 1
A preparation method of liquid crystal glass substrate separation paper comprises the following steps:
(1) pulping: respectively carrying out pulping treatment on the two types of pulp which are already crushed, wherein the pulping mode adopts a circulating reflux mode to firstly carry out light cutter defibering and then carry out micro-pulping to cut off fibers, wherein the pulping degree of bleached sulfate softwood pulp is 25 DEG SR, and the pulping degree of bleached sulfate hardwood pulp is 20 DEG SR, and thus softwood pulp and hardwood pulp are respectively prepared;
(2) mixing pulp, namely uniformly mixing 60 percent of softwood pulp and 40 percent of hardwood pulp to prepare mixed pulp;
(3) squeezing: and (3) squeezing and dewatering the wet paper web in a continuous light-pressing mode to ensure that the dryness content of the paper is 35%.
(4) And (3) quick drying: and (4) carrying out quick drying treatment on the paper dehydrated in the step (3), wherein the drying cylinder temperature is 100 ℃.
(5) Surface treatment: and (3) acidizing the dried paper by using a surface sizing method, wherein the acid auxiliary agent is citric acid, the concentration is 3%, and the pH value of the paper is 5.8.
(6) Secondary drying: and (5) drying the paper subjected to surface treatment in the step (5) by adopting a conventional drying method, and arranging 4 cooling cylinders for cooling to assist in eliminating static electricity.
(7) Calendering and coiling: and (4) calendaring the paper dried in the step (6), then reeling, arranging a static eliminator before reeling to eliminate static electricity, and preparing the finished product liquid crystal glass substrate partition paper with the water content of 6%.
The physical indexes of the liquid crystal glass substrate partition paper prepared by the comparative example are as follows:
Figure GDA0003243715220000141
Figure GDA0003243715220000151
comparative example 2
A preparation method of liquid crystal glass substrate spacer paper with a 'seersucker' structure comprises the following steps:
(1) pulping: respectively carrying out pulping treatment on the two types of pulp which are already crushed, wherein the pulping mode adopts a circulating reflux mode to firstly carry out light cutter defibering and then carry out micro-pulping to cut off fibers, wherein the pulping degree of bleached sulfate softwood pulp is 25 DEG SR, and the pulping degree of bleached sulfate hardwood pulp is 20 DEG SR, and thus softwood pulp and hardwood pulp are respectively prepared;
(2) mixing pulp, namely uniformly mixing 60 percent of softwood pulp and 40 percent of hardwood pulp to prepare mixed pulp;
(3) adding a nanofiber material: pumping the mixed slurry obtained in the step (2) into a slurry pool, and adding the softwood nano-cellulose, wherein the adding amount is 1.5% of the mass of the mixed slurry;
(4) squeezing: and (3) squeezing and dewatering the wet paper web in a continuous light-pressing mode to ensure that the dryness content of the paper is 35%.
(5) Primary drying: and (5) carrying out common drying treatment on the paper dehydrated in the step (4), wherein the drying cylinder temperature is 80 ℃.
(6) Surface treatment: and (3) acidizing the dried paper by using a surface sizing method, wherein the acid auxiliary agent is citric acid, the concentration is 3%, and the pH value of the paper is 5.8.
(7) Secondary drying: and (4) drying the paper subjected to surface treatment in the step (6) by adopting a conventional drying method, and arranging 4 cooling cylinders for cooling to assist in eliminating static electricity.
(8) Calendering and coiling: and (4) calendaring the paper dried in the step (7), then reeling, arranging a static eliminator before reeling to eliminate static electricity, and preparing finished product liquid crystal glass substrate partition paper with the water content of 6%.
The physical indexes of the liquid crystal glass substrate spacer paper prepared in this example are as follows:
Figure GDA0003243715220000161
analysis of results
It is understood from examples 1 to 5 that the tensile strength of the prepared liquid crystal glass substrate spacer paper is increased with the increase of the beating degree of the softwood pulp and the hardwood pulp, but the air permeability and the stiffness are decreased. With the increase of the dosage of the softwood nanocellulose, the tensile strength and the stiffness of the prepared liquid crystal glass substrate partition paper are obviously improved, and the air permeability is also improved;
it is understood from examples 3 and 5 that the decrease in strength and air permeability is relatively serious although the stiffness of the prepared liquid crystal glass substrate spacer paper is increased by increasing the amount of the hardwood blending ratio;
it is understood from example 2 and comparative example 1 that the liquid crystal glass substrate spacer paper without adding the softwood nanocellulose has low air permeability, tensile strength and stiffness.
It is understood from example 3 and comparative example 2 that the change in tensile strength and stiffness of the liquid crystal glass substrate separator paper is small without the rapid drying treatment, but the bulk and air permeability of the finished paper are remarkably decreased. The liquid crystal glass substrate has low air permeability and can be mildewed. The paper bulk can be improved by the rapid drying treatment, and a microscopically smooth and macroscopically not very smooth 'seersucker' structure is formed.
Comprehensive analysis shows that the technical scheme of the invention solves the problem that the air permeability, the tensile strength and the stiffness of the spacer paper between the liquid crystal glass substrates cannot be considered simultaneously by adding the nano-fiber material, and simultaneously adopting the modes of beating degree, softwood pulp and hardwood pulp proportion, quick drying and the like, thereby further balancing the indexes.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the embodiments, and any other changes, modifications, combinations, substitutions and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.

Claims (14)

1. A preparation method of liquid crystal glass substrate spacer paper with a 'seersucker' structure comprises the following steps:
(1) pulping the disintegrated native softwood pulp and native hardwood pulp respectively to prepare softwood pulp and hardwood pulp respectively;
(2) blending 60-70% of softwood pulp and 30-40% of hardwood pulp by mass percent, and uniformly mixing to prepare mixed pulp;
(3) adding a nanofiber material reinforcing agent into the mixed slurry prepared in the step (2), wherein the addition amount of the nanofiber material reinforcing agent is 0.3-2% of the mass of the mixed slurry;
the nano fiber material reinforcing agent is nanoscale, the length-diameter ratio is 30-100, and the specific surface area is 3000-8000;
the nano fiber material reinforcing agent is needle-leaved wood nano fiber;
(4) squeezing and dehydrating the wet paper web by adopting a continuous light pressing mode, and then drying, carrying out surface acidification treatment, carrying out secondary drying, and carrying out press polish coiling to obtain the wet paper web;
the drying is a high-temperature quick drying mode, and the temperature of a drying cylinder for drying is 100-110 ℃.
2. The method according to claim 1, wherein the beating process in step (1) is a light beating process in which light knife defibering and proper cutting are performed by means of a circulation reflux.
3. The method of claim 1 wherein the raw softwood pulp of step (1) is a bleached softwood pulp produced by a chemical or semi-chemical or chemimechanical process.
4. The method of claim 1 wherein said raw hardwood pulp in step (1) is bleached hardwood pulp produced by a chemical or semi-chemical or chemimechanical process.
5. The method of claim 1, wherein the raw softwood pulp in step (1) has a freeness of from 20 ° SR to 30 ° SR; the beating degree of the primary hardwood pulp is 18-25 DEG SR.
6. The method of claim 1, wherein the raw softwood pulp freeness in step (1) is from 20 ° SR to 25 ° SR; the beating degree of the primary hardwood pulp is 20-25 DEG SR.
7. The method of claim 1, wherein the softwood nanofibers comprise mechanically produced nanofibers and/or chemically produced nanofibers.
8. The method of claim 1, wherein the press dewatering in step (4) provides a paper dryness of 30% to 45%.
9. The method of claim 1, wherein the press dewatering in step (4) is a continuous light press.
10. The preparation method of claim 1, wherein the surface acidification treatment in the step (4) is carried out by adopting a surface sizing method, the acid auxiliary agent is citric acid, the mass percent concentration is 1-6%, and the pH value of the paper is 4-6.
11. The method of claim 10, wherein the paper has a pH of 5 to 6.
12. The method according to claim 1, wherein in the step (4), calendering and winding are performed, and after the paper is calendered, a static eliminator is provided to further eliminate static electricity, and then winding is performed.
13. A liquid crystal glass substrate partition paper with a 'seersucker' structure has the following physical and chemical indexes:
the quantitative ratio is 30-60 g/m2Bulk of 1.3-1.8 cm3The tensile strength of the composite material is 3-5 KN/m in the longitudinal direction, 2-5 KN/m in the transverse direction, 20-50 mN in the longitudinal direction, 15-40 mN in the transverse direction and 150-220 um/Pa.s in air permeability.
14. The liquid crystal glass substrate separator paper according to claim 13, wherein other physical and chemical properties of the liquid crystal glass substrate separator paper are as follows: the whiteness is 70% -90%, the smoothness of the front surface is 15-40 s, the smoothness of the back surface is 15-40 s, and the dust degree is 5-20/m2And 4-8% of water.
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