CN113279286A

CN113279286A - Coated paper and preparation method thereof

Info

Publication number: CN113279286A
Application number: CN202110367832.7A
Authority: CN
Inventors: 杨露; 陈杰; 於旺盛; 刘春�; 壮欢
Original assignee: Gold East Paper Jiangsu Co Ltd
Current assignee: Gold East Paper Jiangsu Co Ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-08-20
Anticipated expiration: 2041-04-06
Also published as: CN113279286B

Abstract

The invention discloses coated paper and a preparation method thereof, wherein the preparation method of the coated paper comprises the following steps: obtaining papermaking slurry, and papermaking slurry to obtain a raw paper layer; forming a base coat on at least one side of the raw paper layer; obtaining a surface coating, coating the surface coating on one side of the base coat, which is far away from the raw paper layer, to form a surface coating, so as to obtain coated paper; the top coating comprises styrene-butadiene latex, and the mass fraction range of styrene monomers combined in the styrene-butadiene latex is 40-70%. The method can improve the ink absorbability and the ink drying capacity of the paper, and further improve the lithographic printing speed.

Description

Coated paper and preparation method thereof

Technical Field

The invention relates to the technical field of paper preparation, in particular to coated paper and a preparation method thereof.

Background

Lithography is currently the predominant printing method in the printing market. On the premise of satisfying the printing quality, the improvement of the printing speed is one of the main competitive means in the current printing market. Therefore, in order to increase the lithographic printing speed, it is important to improve the characteristics of paper such as ink absorbency and ink drying ability.

The conventional preparation method of coated paper usually replaces pigments in a coating formula, and improves the characteristics of paper, such as ink absorptivity, ink drying capacity and the like, by improving the absorption and drying performance of the pigments in the coating on ink.

Disclosure of Invention

The invention provides coated paper and a preparation method thereof, which aim to improve the characteristics of paper such as ink absorbability, ink drying capacity and the like.

In order to solve the technical problem, the invention provides a preparation method of coated paper, which comprises the following steps: obtaining papermaking slurry, and papermaking slurry to obtain a raw paper layer; forming a base coat on at least one side of the raw paper layer; obtaining a surface coating, coating the surface coating on one side of the base coat, which is far away from the raw paper layer, to form a surface coating, so as to obtain coated paper; the top coating comprises styrene-butadiene latex, and the mass fraction range of styrene monomers combined in the styrene-butadiene latex is 40-70%.

The method comprises the following steps of obtaining a top coating paint, coating the top coating paint to one side, far away from a raw paper layer, of a base coat, and forming a top coat, wherein the step of forming the top coat comprises the following steps: obtaining a surface coating paint comprising first calcium carbonate, second calcium carbonate, kaolin and styrene-butadiene latex; wherein the solid content range of the top coating is 65-70%, and the viscosity range of the top coating is 1800-3000 cP sec.

Wherein the first calcium carbonate comprises 98-grade ground calcium carbonate and the second calcium carbonate comprises precipitated calcium carbonate; in the top coating, the mass range of 98-grade ground calcium carbonate is 60-90 parts by mass, the mass range of precipitated calcium carbonate is 10-30 parts by mass, the mass range of kaolin is 10-20 parts by mass, and the mass range of styrene-butadiene latex is 10-20 parts by mass; wherein the total mass of the first calcium carbonate, the second calcium carbonate and the kaolin in the top-coat paint is 100 parts by mass.

Wherein the particle size range of the styrene-butadiene latex is 150-180 nanometers.

The method comprises the following steps of obtaining a top coating paint, coating the top coating paint to one side, far away from a raw paper layer, of a base coat, and forming a top coat, wherein the step of obtaining the top coating paint further comprises the following steps: uniformly coating the surface coating paint to one side of the base coat, which is far away from the raw paper layer, according to a preset coating weight to form a surface coating; wherein the preset coating weight range is 10-15 g/square meter.

The method for obtaining the raw paper layer by obtaining the papermaking slurry comprises the following steps: obtaining papermaking slurry containing plant fibers and a retention aid; wherein the retention aid comprises cationic polyacrylamide and silica sol; the addition amount of the cationic polyacrylamide in the papermaking slurry is 200-250 ppm, and the addition amount of the silica sol in the papermaking slurry is 4000-5000 ppm.

Wherein, the plant fiber comprises: bleached sulfate softwood pulp, bleached sulfate hardwood pulp, and bleached chemithermomechanical pulp; the freeness range of the bleached sulfate softwood pulp is 280-320 ml, the freeness range of the bleached sulfate hardwood pulp is 300-340 ml, and the freeness range of the bleached chemithermomechanical pulp is 180-210 ml.

Wherein the mass fraction range of the bleached sulfate softwood pulp in the papermaking pulp is as follows: 10-20%; the mass fraction range of the bleached sulfate hardwood pulp in the papermaking pulp is as follows: 60-80%; the mass fraction range of the bleached chemithermomechanical pulp in the papermaking pulp is as follows: 10 to 20 percent.

The method for obtaining the raw paper layer by obtaining the papermaking slurry comprises the following steps: papermaking pulp is manufactured within the range of the concentration of the preset white water to obtain a raw paper layer; wherein the preset white water concentration range is 0.15-0.20%.

In order to solve the technical problem, the invention also provides coated paper, which comprises a raw paper layer; the base coat is coated on at least one side of the raw paper layer; the top coating is coated on one side of the bottom coating, which is far away from the raw paper layer; the top coating comprises styrene-butadiene latex, and the mass fraction range of styrene monomers combined in the styrene-butadiene latex is 40-70%.

The invention has the beneficial effects that: different from the situation of the prior art, the method comprises the steps of obtaining papermaking slurry, obtaining a raw paper layer by papermaking slurry, forming a bottom coating on at least one side of the raw paper layer, further obtaining a surface coating, and coating the surface coating on one side, away from the raw paper layer, of the bottom coating to form a surface coating, so as to obtain the coated paper. And the top coating comprises butylbenzene latex, and the mass fraction range of the butylbenzene latex combined with the styrene monomer is 40-70%, so that the open pore property of the top coating is increased by increasing the ratio of the butylbenzene latex combined with the styrene monomer, and the ink absorbability and the ink drying capacity of the finished coated paper are improved.

Drawings

FIG. 1 is a schematic flow diagram of an embodiment of a method of making coated paper according to the present invention;

FIG. 2 is a schematic flow diagram of another embodiment of a method of making coated paper according to the present invention;

FIG. 3 is a schematic structural diagram of an embodiment of coated paper according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a method for preparing coated paper according to the present invention.

Step S11: and obtaining papermaking slurry, and papermaking slurry to obtain the raw paper layer.

And obtaining papermaking slurry, and papermaking the papermaking slurry to obtain the raw paper layer.

The papermaking pulp is prepared by pulping papermaking raw materials according to the variety, the property and the requirement of papermaking paper, and then adding sizing materials, fillers, pigments and other auxiliary agents to prepare a fiber suspension for papermaking.

In a specific application scenario, the papermaking method of the embodiment includes wet papermaking, and papermaking is performed on papermaking slurry with water as a medium to obtain a raw paper layer.

Step S12: a base coat is formed on at least one side of the raw paper layer.

A base coat is formed on at least one side of the raw paper layer. Specifically, at least one side of the raw paper layer is coated or sprayed with a primer coating to form the primer coating, wherein the primer coating comprises an inorganic pigment and an adhesive.

In one particular application scenario, when making single-sided coated paper, a primer coating is applied to one side of the raw paper layer to form a single-layer primer. In another specific application scenario, when preparing double-sided coated paper, a base coat is applied to opposite sides of the raw paper layer to form a two-layer base coat.

In a specific application scenario, the primer or primer may include: c65 ground calcium carbonate, precipitated calcium carbonate, starch, and styrene-butadiene latex.

Step S13: obtaining a surface coating, coating the surface coating on one side of the base coat, which is far away from the raw paper layer, to form a surface coating, so as to obtain coated paper; the top coating comprises styrene-butadiene latex, and the mass fraction range of styrene monomers combined in the styrene-butadiene latex is 40-70%.

And obtaining a surface coating, respectively coating the surface coating on one side of the base coat, which is far away from the raw paper layer, to form a surface coating, so as to obtain the coated paper. In a particular application scenario, when one side of the base paper layer is coated with a base coating, a top coating is applied to the side of the base coating remote from the base paper layer to form a single-layer top coating. In another specific application scenario, when both opposite sides of the base paper layer are coated with the base coating, a top coating is applied to the two base coatings on the sides thereof remote from the base paper layer to form two top coatings.

The top coating or top coating in this embodiment includes styrene-butadiene latex, and the mass fraction range of styrene monomer combined in styrene-butadiene latex is 40-70%, for example: 40%, 45%, 50%, 55%, 59%, 60%, 65%, 69%, 70%, etc., and the specific examples are not limited thereto. The styrene-butadiene latex within the mass fraction range can realize the glass transition temperature of 1-5 ℃. Specifically, the glass transition temperature of the styrene-butadiene latex may be 1 degree celsius, 2 degrees celsius, 3 degrees celsius, 4 degrees celsius, 5 degrees celsius, or the like, and may be specifically set based on actual needs.

The mass fraction range of the combined styrene monomer refers to the mass fraction range of the styrene monomer added in the preparation of the styrene-butadiene latex, and the finished styrene-butadiene latex does not contain the styrene monomer any more.

The tg value of the finished product styrene-butadiene latex is increased along with the increase of the addition ratio of the styrene monomer in the preparation of the styrene-butadiene latex, and the styrene monomer is favorable for improving the pore-opening property of the film formed by the styrene-butadiene latex, so that the pore-opening property of the surface coating can be improved by increasing the ratio of the styrene monomer in the preparation of the surface coating by selecting the styrene-butadiene latex with a higher tg value specification, and the absorption and drying of the whole coated paper on printing ink are further facilitated.

By the method, the preparation method of the coated paper of the embodiment includes the steps of obtaining papermaking slurry, making the papermaking slurry to obtain the raw paper layer, forming the base coating on at least one side of the raw paper layer, further obtaining the surface coating, and coating the surface coating on one side, away from the raw paper layer, of the base coating to form the top coating, so that the coated paper is obtained. And wherein the top-coat paint comprises styrene-butadiene latex, the mass fraction range of styrene monomer combined in the styrene-butadiene latex is 40-70%, so that the styrene-butadiene latex with the improved styrene monomer addition ratio in the preparation process can be obtained by selecting the styrene-butadiene latex with a high tg value, the hole forming property of the top-coat paint is further increased, the ink absorbability and the ink drying capacity of the finished coated paper are further improved, the styrene-butadiene latex is improved in the embodiment, the styrene-butadiene latex has wide practicability in the actual production, and therefore the production link does not need to be modified due to the improvement of the styrene-butadiene latex in the actual application, and the scheme of the embodiment has wide applicability.

Referring to fig. 2, fig. 2 is a schematic flow chart of another embodiment of the method for preparing coated paper according to the present invention.

Step S21: obtaining papermaking pulp containing plant fibers and a retention aid, and obtaining the raw paper layer by papermaking pulp.

The method comprises the steps of firstly obtaining papermaking slurry containing plant fibers and a retention aid, and then papermaking the papermaking slurry to obtain a raw paper layer.

In a specific application scenario, the plant fibers include bleached kraft softwood pulp (NBKP), bleached kraft hardwood pulp (LBKP), and bleached chemithermomechanical pulp (BCTMP). In order to improve the uniformity of the coated base paper and further improve the printing quality, the preparation of the base paper layer is performed by using the plant fibers of the bleached sulfate softwood pulp with the freeness range of 280-320 ml, the bleached sulfate hardwood pulp with the freeness range of 300-340 ml and the bleached chemithermomechanical pulp with the freeness range of 180-210 ml. The lower freeness of plant fiber slurry is passed through to this embodiment to provide better plant fiber slurry dispersibility, reduce the flocculation of thick liquids self, and then promote the uniformity of papermaking thick liquids. The freeness of bleached kraft softwood pulp may be 280ml, 290ml, 300ml, 310ml, 320ml, etc. The freeness of bleached kraft hardwood pulp may be 300ml, 310ml, 320ml, 330ml, 340ml, etc. The freeness of the bleached chemithermomechanical pulp can be 180ml, 190ml, 200ml, 205ml, 210ml, etc. The setting may be specifically performed based on actual requirements, and is not limited herein.

Wherein the mass fraction range of the bleached sulfate softwood pulp (NBKP) in the papermaking slurry is 10-20%; the mass fraction range of bleached kraft hardwood pulp (LBKP) in papermaking pulp is: 60-80%; the mass fraction range of the bleached chemithermomechanical pulp (BCTMP) in the papermaking pulp is as follows: 10 to 20 percent. The mass fraction of the bleached kraft softwood pulp in the papermaking slurry may specifically be: 10%, 12%, 14%, 15%, 17%, 20%, etc., wherein the mass fraction of the bleached sulfate hardwood pulp in the papermaking pulp can be specifically as follows: 60%, 72%, 64%, 75%, 77%, 80% and the like, wherein the mass fraction of the bleached chemithermomechanical pulp in the papermaking pulp can be specifically as follows: 10%, 11%, 13%, 15%, 17%, 20%, etc., which may be specifically set based on actual needs, and are not limited herein.

In a specific application scenario, the retention aid comprises a cationic polyacrylamide and a silica sol; the addition amount of the cationic polyacrylamide in the papermaking slurry is 200-250 ppm, and the addition amount of the silica sol in the papermaking slurry is 4000-5000 ppm. Wherein ppm concentration (parts per million) is the added amount of solute mass relative to oven dried pulp, i.e. grams of drug added per ton of oven dried pulp.

This embodiment reduces the flocculation of chemicals to thick liquid through reducing the retention aid quantity that wet end added, promotes the evenness of body paper. The amount of the cationic polyacrylamide may be, for example, 200ppm, 210ppm, 220ppm, 230ppm, 240ppm, 250ppm, etc., and the amount of the silica sol may be, for example, 4000ppm, 4100ppm, 4200ppm, 4300ppm, 4400ppm, 4500ppm, 4600ppm, 4700ppm, 4800ppm, 4900ppm, 5000ppm, etc., and may be set based on actual requirements, which is not limited herein.

And after the papermaking slurry within the freeness range and the material proportion range is obtained, papermaking slurry is manufactured within the preset white water concentration range to obtain the raw paper layer. Wherein the preset white water concentration range is 0.15-0.20%. The concentration of white water in the paper machine is improved, the concentration is combined with the reduction of the use amount of the retention aid, the flocculation of chemicals to pulp is reduced, and the evenness of the base paper is improved. The preset white water concentration may be specifically 0.15%, 0.16%, 0.17%, 0.18%, 0.19%, 0.20%, and the like, and may be specifically set based on actual requirements, which is not limited herein.

Step S22: a base coat is formed on at least one side of the raw paper layer.

And coating a base coating on at least one side of the raw paper layer to form a base coating on at least one side of the raw paper layer. This example protects the raw paper layer by means of a primer. The primer coating comprises an inorganic pigment and an adhesive.

Step S23: obtaining a surface coating paint comprising first calcium carbonate, second calcium carbonate, kaolin and styrene-butadiene latex; and uniformly coating the surface coating paint on one side of the base coating layer, which is far away from the raw paper layer, according to a preset coating weight to form a surface coating.

And obtaining the surface coating paint comprising the first calcium carbonate, the second calcium carbonate, the kaolin and the styrene-butadiene latex. Wherein the first calcium carbonate comprises grade 98 ground calcium carbonate and the second calcium carbonate comprises precipitated calcium carbonate.

In a specific application scenario, a topcoat coating comprising 98-grade ground calcium carbonate, precipitated calcium carbonate, kaolin, and styrene-butadiene latex may be obtained. Wherein the mass range of 98-grade ground calcium carbonate in the top-coat paint is 60-90 parts by mass, the mass range of precipitated calcium carbonate is 10-30 parts by mass, the mass range of kaolin is 10-20 parts by mass, and the mass range of styrene-butadiene latex is 10-20 parts by mass; wherein the total mass of the first calcium carbonate, the second calcium carbonate and the kaolin in the top-coat paint is 100 parts by mass. The 98-grade ground calcium carbonate can be 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts and the like by mass, the precipitated calcium carbonate can be 10 parts, 12 parts, 15 parts, 20 parts, 25 parts, 28 parts, 30 parts and the like by mass, the kaolin can be 10 parts, 11 parts, 12 parts, 13 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts and the like by mass, and the styrene-butadiene latex can be 10 parts, 11 parts, 12 parts, 13 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts and the like by mass. The setting may be specifically performed based on actual requirements, and is not limited herein.

The precipitated calcium carbonate is rod-shaped or needle-shaped, the PSD50 particle size range is 0.3-0.5 micrometer, and when the precipitated calcium carbonate and kaolin are used in a surface coating, uniform pores can be formed in a surface coating, so that the absorptivity and drying speed of ink are ensured. The tg value of the styrene-butadiene latex of the embodiment is in the range of 1-5 ℃, and the particle size is in the range of 150-180 nm. The mass fraction range of the styrene monomer combined in the styrene-butadiene latex is 40-70%. In the styrene-butadiene latex, the tg value is increased along with the increase of the addition ratio of the styrene monomer in the preparation process of the styrene-butadiene latex, and the styrene monomer is favorable for improving the pore-opening property of the latex for film formation, so the latex with the high tg value can increase the pore-opening property of the formed latex. Thus, both a high tg value and a higher particle size are beneficial for the absorption and drying properties of the ink. The particle size of the styrene-butadiene latex may be 150 nm, 160 nm, 170 nm, 180nm, and the like, and the particle size of the PSD50 of the precipitated calcium carbonate may be 0.3 micron, 0.4 micron, 0.5 micron, and the like, and may be set based on actual requirements, which is not limited herein.

And obtaining the top coating paint with the substances and the mixture ratio range. Wherein the solid content range of the top coating is 65-70%, and the viscosity range is 1800-3000 cP second (cps). Topcoat materials within the above parameters provide better uniformity and facilitate robust adhesion to the basecoat to form a stable topcoat. The solid content of the top-coat paint may be 65%, 66%, 67%, 68%, 69%, 70%, etc., and the viscosity of the top-coat paint may be 1800cps, 1850cps, 1900cps, 2000cps, 2200cps, 2300cps, 2400cps, 2600cps, 2700cps, 2800cps, 2950cps, 3000cps, etc., and may be set based on actual requirements, which is not limited herein.

And uniformly coating the top coating on one side of the base coating layer away from the raw paper layer according to a preset coating weight so as to form the top coating on the outer side of the base coating layer. Wherein the preset coating weight range is 10-15 g/square meter. The coating is carried out according to the coating weight, so that the uniformity of the top coating and the preparation efficiency of the top coating can be ensured. The preset coating amount may be specifically 10 g/square meter, 11 g/square meter, 12 g/square meter, 13 g/square meter, 14 g/square meter, 15 g/square meter, and the like, and may be specifically set based on actual requirements, which is not limited herein.

The paper prepared by the method is calendered to obtain the required coated paper, and the coated paper can meet the requirement of high-speed lithographic printing and has relatively excellent printing quality.

In the embodiment, rod-shaped or needle-shaped precipitated calcium carbonate with the particle size range of PSD50 of 0.3-0.5 um is selected, a proper amount of kaolin is added, and styrene-butadiene latex with higher tg temperature and the particle size is selected. Can improve the ink absorption performance, the ink drying performance and the printing and floating performance of coated paper.

The preparation method and performance of the coated paper prepared according to the above formulation of the present invention will be examined through a plurality of specific examples. The determination was carried out by taking the method of producing coated paper having a basis weight of 120 g/m as an example. The evenness of the raw paper layer is firstly detected.

By comparing the embodiment 1 (comparison group) and the embodiments 2 to 5, the preparation method of the art paper disclosed by the invention has the advantages that on one hand, the lower freeness of the plant fiber pulp is controlled, the better dispersion performance of the plant fiber pulp is provided, the flocculation of the pulp is reduced, on the other hand, the amount of the retention aid added at the wet end is reduced, the concentration of white water of a paper machine is increased, the flocculation of chemicals to the pulp is reduced, and the evenness of the base paper is improved. The embodiment improves the evenness of the base paper by controlling the freeness of the grinding pulp, optimizing the using amount of the retention aid, improving the concentration of the white water and controlling the sizing process conditions, and also ensures the evenness of coating, thereby ensuring that the printing ink has better absorption evenness and improving the printing quality when the paper is printed.

In this embodiment, the base paper layer and the top coating layer are combined for detection. Wherein, this detection selects 5 top-coat formulas:

the coating formula 1: 80 parts of 98-grade ground calcium carbonate, 20 parts of precipitated calcium carbonate, 0 part of kaolin and 15 parts of styrene-butadiene latex; wherein the particle size of the styrene-butadiene latex is 130 microns, and the tg value is-5 ℃.

The coating formula 2: 80 parts of 98-grade ground calcium carbonate, 20 parts of precipitated calcium carbonate, 0 part of kaolin and 15 parts of styrene-butadiene latex; wherein the particle size of the styrene-butadiene latex is 150 microns, and the tg value is 1 ℃.

Coating formula 3: 80 parts of 98-grade ground calcium carbonate, 20 parts of precipitated calcium carbonate, 0 part of kaolin and 15 parts of styrene-butadiene latex; wherein the particle size of the styrene-butadiene latex is 180 microns, and the tg value is 5 ℃.

Coating formula 4: 80 parts of 98-grade ground calcium carbonate, 10 parts of precipitated calcium carbonate, 10 parts of kaolin and 15 parts of styrene-butadiene latex; wherein the particle size of the styrene-butadiene latex is 150 microns, and the tg value is 1 ℃.

Coating formula 5: 80 parts of 98-grade ground calcium carbonate, 10 parts of precipitated calcium carbonate, 10 parts of kaolin and 15 parts of styrene-butadiene latex; wherein the particle size of the styrene-butadiene latex is 180 microns, and the tg value is 5 ℃.

Examples 6 to 14: consists of the base paper evenness improving embodiment 1/3/5+ coating formula 1/2/3/4/5.

Comparing the above example 6 (control group) with examples 7 to 14, it can be seen that the preparation method of coated paper of the present invention selects rod-shaped or needle-shaped precipitated calcium carbonate, PSD50 with particle size range of 0.3 to 0.5 micron, and kaolin, so as to form uniform pores in the coating and ensure the ink absorbency and drying speed. According to the invention, the high tg value (1-5 ℃) and relatively high particle size (130-180 nm) styrene-butadiene latex is selected, so that the film-forming pore opening property of the styrene-butadiene latex can be improved through the styrene monomer, and the film-forming pore opening property of the high tg value latex can be increased. Thus, both a high tg value and a higher particle size are beneficial for the absorption and drying properties of the ink.

According to the invention, on one hand, the uniformity of the base paper is improved by optimizing the papermaking slurry of the base paper, so that the coating is more uniform, on the other hand, the ink absorption uniformity and the ink dryness of the coated paper are improved by selecting the latex with higher TG value and particle size and the precipitated calcium carbonate or kaolin with specific crystal form/particle size, and the coated paper produced by the method can simultaneously meet high-speed lithographic printing and high-quality printing.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a coated paper according to an embodiment of the present invention. The present embodiment takes a double-sided coated paper as an example for structural explanation.

The coated paper 10 of the present embodiment includes a base paper layer 11, a primer layer 12, and a top coat layer 13. Wherein, the opposite sides of the raw paper layer 11 are respectively coated with a bottom coating 12, and the side of each bottom coating 12 far away from the raw paper layer 11 is respectively coated with a top coating 13. The top coat layer 13, the primer layer 12, the raw paper layer 11, the primer layer 12, and the top coat layer 13 of the present example were stacked in this order.

The coated paper 10 of the present embodiment can be prepared by the method for preparing coated paper of any one of the above embodiments. The top coat in this embodiment includes styrene-butadiene latex. In addition, the mass fraction range of the styrene monomer combined in the styrene-butadiene latex of the embodiment is 40-70%. The glass transition temperature (tg value) of the styrene-butadiene latex of this example is in the range of 1 to 5 ℃.

Wherein, in the butylbenzene latex, the tg value is increased along with the addition of the styrene monomer in the preparation process, and the styrene monomer is favorable for improving the pore-opening property of the butylbenzene latex for film formation, so that the pore-opening property of the top coating can be increased by selecting the butylbenzene latex with the tg value to prepare the top coating, and the absorption and drying of the whole copper plate paper on the printing ink are further facilitated.

By the method, the aperture of the top coating is increased by selecting the styrene-butadiene latex with the high tg value specification for preparing the top coating, and the ink absorbability and the ink drying capacity of the finished coated paper can be improved by utilizing the aperture of the styrene monomer.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The preparation method of the coated paper is characterized by comprising the following steps:

obtaining papermaking slurry, and papermaking the papermaking slurry to obtain a raw paper layer;

forming a base coat on at least one side of the raw paper layer;

obtaining a top coating, and coating the top coating to one side of the base coat, which is far away from the raw paper layer, to form a top coating so as to obtain coated paper; the top-coating paint comprises styrene-butadiene latex, and the mass fraction range of styrene monomers combined in the styrene-butadiene latex is 40-70%.

2. The method of preparing coated paper according to claim 1, wherein the step of obtaining a topcoat coating, applying the topcoat coating to a side of the base coat layer remote from the raw paper layer, and forming a topcoat layer comprises:

obtaining a surface coating paint comprising first calcium carbonate, second calcium carbonate, kaolin and the styrene-butadiene latex;

wherein the solid content range of the top coating is 65-70%, and the viscosity range of the top coating is 1800-3000 cP sec.

3. The method of preparing coated paper according to claim 2, wherein the first calcium carbonate comprises grade 98 ground calcium carbonate, and the second calcium carbonate comprises precipitated calcium carbonate;

in the top-coat paint, the mass range of the 98-grade ground calcium carbonate is 60-90 parts by mass, the mass range of the precipitated calcium carbonate is 10-30 parts by mass, the mass range of the kaolin is 10-20 parts by mass, and the mass range of the styrene-butadiene latex is 10-20 parts by mass;

wherein the total mass of the first calcium carbonate, the second calcium carbonate, and the kaolin in the top-coat paint is 100 parts by mass.

4. The method of producing coated paper according to claim 1,

the particle size range of the styrene-butadiene latex is 150-180 nanometers.

5. The method of preparing coated paper according to claim 1, wherein the step of obtaining a topcoat coating, applying the topcoat coating to a side of the base coat layer remote from the raw paper layer, and forming a topcoat layer further comprises:

uniformly coating the top coating on one side of the base coating layer away from the raw paper layer according to a preset coating weight to form the top coating;

wherein the preset coating weight range is 10-15 g/square meter.

6. The method for preparing coated paper according to claim 1, wherein the step of obtaining papermaking slurry and making the papermaking slurry into a raw paper layer comprises:

obtaining papermaking slurry containing plant fibers and a retention aid;

wherein the retention aid comprises cationic polyacrylamide and silica sol; the addition amount of the cationic polyacrylamide in the papermaking slurry ranges from 200ppm to 250ppm, and the addition amount of the silica sol in the papermaking slurry ranges from 4000ppm to 5000 ppm.

7. The method of producing coated paper according to claim 6,

the plant fiber comprises: bleached sulfate softwood pulp, bleached sulfate hardwood pulp, and bleached chemithermomechanical pulp;

the freeness range of the bleached sulfate softwood pulp is 280-320 ml, the freeness range of the bleached sulfate hardwood pulp is 300-340 ml, and the freeness range of the bleached chemithermomechanical pulp is 180-210 ml.

8. The method of producing coated paper according to claim 7,

the mass fraction range of the bleached sulfate softwood pulp in the papermaking pulp is as follows: 10-20%;

the bleached sulfate hardwood pulp is in the papermaking pulp in a mass fraction range of: 60-80%;

the mass fraction range of the bleached chemithermomechanical pulp in the papermaking pulp is as follows: 10 to 20 percent.

9. The method for preparing coated paper according to claim 1, wherein the step of obtaining papermaking slurry and making the papermaking slurry into a raw paper layer comprises:

papermaking pulp is manufactured within a preset white water concentration range to obtain the raw paper layer;

wherein the preset white water concentration range is 0.15% -0.20%.

10. A coated paper, comprising:

a raw paper layer;

a base coat, wherein the base coat is coated on at least one side of the raw paper layer;

the top coating is coated on one side, far away from the raw paper layer, of the bottom coating;

the top coating comprises styrene-butadiene latex, and the mass fraction range of styrene monomers combined in the styrene-butadiene latex is 40-70%.