A paper coating material, its preparation method and application

Abstract

The application provides a paper coating paint, a preparation method and application thereof, and the paper coating paint comprises the following raw materials in parts by weight: calcined kaolin 15-25 parts, alkaline nano silica gel 10-15 parts, modified bentonite 20-25 parts, coating-grade talc powder 30-40 parts, high-gloss acrylic resin 2-5 parts, soybean protein 1-3 parts, SB styrene-butadiene latex 10-14 parts, ammonia water 0.05-0.2 parts, potassium zirconium carbonate water-resistant agent 0.2-0.6 parts, mineral oil defoaming agent 0.05-0.2 parts, polyacrylic acid sodium dispersant 0.05-0.15 parts, and water 30-50 parts. The paper coating paint in the application can be coated on line during paper (board) production, and meanwhile, the technical requirements of UV ink jetting code and water-based ink jetting code can be met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of papermaking, and particularly relates to a paper coating coating material, a preparation method and application thereof. BACKGROUND

[0002] With the rapid development of digital technology in the consumer field, electronic supervision bar codes, anti-fake two-dimensional codes and other identification codes are printed on the outside of medicine cards, other paper (box) packages and labels to realize one-box-one-code, which is used for fast commodity identification, tracing and verification. The bar codes are generally printed by inkjet printing in a printing factory, which is low in cost and clear in imaging. The inkjet printing uses UV ink or water-based ink. The UV ink can be instantaneously solidified by ultraviolet drying. The water-based ink is solidified by penetration and heating drying. Both the two kinds of ink require that the surface of the coated paper (board) can quickly absorb ink and solidify to prevent smearing. In addition, the ink cannot be absorbed too quickly to cause mottling and dispersion.

[0003] Many electronic supervision bar codes and anti-fake two-dimensional codes on the market have the problems of poor inkjet printing, mottling and dispersion, connected inkjet printing and poor code scanning. The existing inkjet coating formula has low inkjet quality, and cannot restore the saturation and clarity of the bar code and two-dimensional code. In addition, the existing inkjet coating formula generally uses VAE latex or PVAc latex, which is high in cost. SUMMARY

[0004] The application aims to provide a paper coating coating material, a preparation method and application thereof. The paper coating coating material in the application can meet the technical requirements of UV inkjet printing and water-based inkjet printing when being coated online during paper (board) production.

[0005] The application provides a paper coating coating material, which comprises the following raw materials in parts by weight:

[0006]

[0007]

[0008] Preferably, the high-gloss acrylic resin is a high-gloss hard styrene-acrylic copolymer, and the Tg glass transition temperature is 100-110 DEG C.

[0009] Preferably, the calcined kaolin has an oil absorption value of 80-100 g / g.

[0010] Preferably, the water-resistant agent is a potassium zirconium carbonate water-resistant agent.

[0011] Preferably, the defoaming agent is a mineral oil defoaming agent.

[0012] Preferably, the dispersing agent is a polyacrylic acid sodium dispersing agent.

[0013] The application provides a paper coating paint preparation method as described above, comprising the following steps:

[0014] A) mixing a dispersing agent, ammonia, a defoaming agent with water, and then sequentially adding calcined kaolin, alkaline nanoscale silica gel, modified bentonite, coating-grade talc powder and high-gloss acrylic resin, and stirring and mixing to obtain a first mixture;

[0015] B) adding soybean protein into the first mixture and stirring and mixing to obtain a second mixture;

[0016] C) adding SB styrene-butadiene latex into the second mixture and stirring and mixing to obtain a third mixture;

[0017] D) adding a water-resistant agent into the third mixture and stirring and mixing to obtain the paper coating paint.

[0018] Preferably, the paper coating paint is prepared in a high-speed dispersion stirrer with a rotation speed of 500-800 r / min.

[0019] The application provides application of the paper coating paint as described above in ink jet coding.

[0020] Preferably, the paper coating paint is coated on the surface of paper, and then ink jet coding is used.

[0021] The application provides a paper coating paint, which comprises the following raw materials in parts by weight: 15-25 parts of calcined kaolin, 10-15 parts of alkaline nanoscale silica gel, 20-25 parts of modified bentonite, 30-40 parts of coating-grade talc powder, 2-5 parts of high-gloss acrylic resin, 1-3 parts of soybean protein, 10-14 parts of SB styrene-butadiene latex, 0.05-0.2 parts of ammonia, 0.2-0.6 parts of potassium zirconium carbonate water-resistant agent, 0.05-0.2 parts of mineral oil defoaming agent, 0.05-0.15 parts of polyacrylic acid sodium dispersing agent and 30-50 parts of water.

[0022] Compared with the prior art, the application has the following advantages:

[0023] (1) The use of calcined kaolin and modified bentonite replaces a large amount of alkaline nanoscale silica gel, obviously reduces the raw material cost under the premise of ensuring the quality of jet coding, and the calcined kaolin and modified bentonite make the coating more loose, have a large specific surface area and strong adsorption capacity, avoid lateral diffusion of jet coding, and have high jet coding clarity.

[0024] (2) The coating-grade talc powder has a sheet structure, a large specific surface area, high coverage, good smoothness and gloss, the high-gloss acrylic resin has a high Tg glass transition temperature and high gloss, and the Tg glass transition temperature and high gloss can also adjust the ink penetration speed, provide fast leveling for UV ink and water-based ink, and have high jet coding saturation.

[0025] (3) Using new environmentally friendly, renewable resources of soy protein as water-retaining agent and auxiliary adhesive. Based on the charge interaction between the amphoteric soy protein and the negative charge pigment (calcined kaolin, alkaline nano silica gel, modified bentonite), the liquid viscosity structure, water-retaining capacity and lubricating capacity are provided to facilitate operation, and the adsorption of part of the soy protein promotes the rapid curing of the coating, and increases the coating structure with high void volume and uniform and stable void ratio, thereby improving the ink absorption, reducing the interference of water on the printing machine, providing fast leveling for UV ink and water-based ink, and high code saturation.

[0026] (4) The coating formula in the present application can achieve the requirements by using cheap and high-strength ordinary SB styrene-butadiene latex, without using expensive PVAc latex and VAE latex.

[0027] (5) The reactive zirconium potassium carbonate water-resistant agent is cross-linked and cured by the active hydroxyl group in the molecule and the hydroxyl group in the SB styrene-butadiene latex, forming a network of cured film, and at the same time, the zirconium substance prevents the affinity between the hydrophilic group of the adhesive and water, achieving the purpose of water resistance, ensuring that the water-based ink is firmly adsorbed on the coating after code spraying, and there is no significant decrease in color density after code drying and water immersion, improving the water resistance after code spraying. In addition, the reactive zirconium potassium carbonate water-resistant agent is an inorganic salt water-resistant agent, which is completely cured after being taken out, and effectively reduces the influence of residual formaldehyde of urea-formaldehyde resin (UF), modified melamine formaldehyde resin (MF) and glyoxal (Glyoxal) and other cross-linking agents on human body and environment. DETAILED DESCRIPTION

[0028] The present application provides a paper coating paint, which comprises the following raw materials in parts by weight:

[0029]

[0030]

[0031] In the present application, the oil absorption value of the calcined kaolin is preferably 80-100 g / g, and more preferably 95-100 g / g, and the parts by weight of the calcined kaolin is preferably 15-25 parts, and more preferably 18-22 parts, such as 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, and preferably the above-mentioned any value as the upper limit or lower limit.

[0032] In the present application, the solid content of the basic nanoscale silica is preferably 25-35%, more preferably 28-32%, and the weight fraction of the basic nanoscale silica is preferably 10-15 parts, more preferably 12-14 parts, such as 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, preferably a range value with the above-mentioned any value as the upper limit or lower limit.

[0033] In the present application, the modified bentonite is preferably a bentonite modified by a calcined active modification method; the weight fraction of the modified bentonite is preferably 20-25 parts, such as 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, preferably a range value with the above-mentioned any value as the upper limit or lower limit.

[0034] In the present application, the weight fraction of the coated talc powder is preferably 30-40 parts, more preferably 32-38 parts, such as 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, preferably a range value with the above-mentioned any value as the upper limit or lower limit.

[0035] In the present application, the high-gloss acrylic resin is preferably a high-gloss hard styrene-acrylic copolymer, and the Tg glass transition temperature is preferably 100-110°C, more preferably 105°C; the weight fraction of the high-gloss acrylic resin is preferably 2-5 parts, more preferably 3-4 parts.

[0036] In the present application, the weight fraction of the soybean protein is preferably 1-3 parts, more preferably 1-2 parts.

[0037] In the present application, the weight fraction of the SB styrene-butadiene latex is preferably 10-14 parts, more preferably 11-13 parts, such as 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, preferably a range value with the above-mentioned any value as the upper limit or lower limit.

[0038] In the present application, the mass content of ammonia in the ammonia water is preferably 20-30%, more preferably 24-26%, and the weight fraction of the ammonia water is preferably 0.05-0.2 parts, more preferably 0.1-0.15 parts, such as 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts, 0.1 parts, 0.11 parts, 0.12 parts, 0.13 parts, 0.14 parts, 0.15 parts, 0.16 parts, 0.17 parts, 0.18 parts, 0.19 parts, 0.2 parts, preferably a range value with the above-mentioned any value as the upper limit or lower limit.

[0039] In the present application, the water-repellent agent is preferably potassium zirconium carbonate water-repellent agent, and the weight fraction of the water-repellent agent is preferably 0.2-0.6 parts, more preferably 0.3-0.5 parts, such as 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, preferably a range value with any of the above values as the upper limit or lower limit.

[0040] In the present application, the defoaming agent is preferably mineral oil defoaming agent, and the weight fraction of the defoaming agent is preferably 0.05-0.2 parts, more preferably 0.1-0.15 parts, such as 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts, 0.1 parts, 0.11 parts, 0.12 parts, 0.13 parts, 0.14 parts, 0.15 parts, 0.16 parts, 0.17 parts, 0.18 parts, 0.19 parts, 0.2 parts, preferably a range value with any of the above values as the upper limit or lower limit.

[0041] In the present application, the dispersant is preferably sodium polyacrylate dispersant, and the weight fraction of the dispersant is preferably 0.05-0.15 parts, more preferably 0.08-0.12 parts, such as 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts, 0.1 parts, 0.11 parts, 0.12 parts, 0.13 parts, 0.14 parts, 0.15 parts, preferably a range value with any of the above values as the upper limit or lower limit.

[0042] In the present application, the weight fraction of water is preferably 30-50 parts, more preferably 35-45 parts, such as 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts, 50 parts, preferably a range value with any of the above values as the upper limit or lower limit.

[0043] The present application also provides a preparation method of the paper coating paint as described above, comprising the following steps:

[0044] A) mixing the dispersant, ammonia water, defoaming agent and water, then sequentially adding the calcined kaolin, alkaline nano silica gel, modified bentonite, coating-grade talc powder and high-gloss acrylic resin, stirring and mixing to obtain a first mixture;

[0045] B) adding soybean protein to the first mixture and stirring and mixing to obtain a second mixture;

[0046] C) adding SB styrene-butadiene latex to the second mixture and stirring and mixing to obtain a third mixture;

[0047] D) adding a water-repellent agent to the third mixture and stirring and mixing to obtain a paper coating paint.

[0048] In the present application, the types and amounts of the dispersant, ammonia, defoaming agent, calcined kaolin, alkaline nanoscale silica gel, modified bentonite, coating-grade talc powder, high-gloss acrylic resin, soybean protein, SB styrene-butadiene latex, and water-resistant agent are consistent with the types and amounts of the dispersant, ammonia, defoaming agent, calcined kaolin, alkaline nanoscale silica gel, modified bentonite, coating-grade talc powder, high-gloss acrylic resin, soybean protein, SB styrene-butadiene latex, and water-resistant agent described above, and the present application will not be described here.

[0049] In the present application, the above preparation process is prepared in a high-speed dispersion stirrer, and the rotation speed of the high-speed dispersion stirrer is preferably 500-800 r / min, more preferably 600-700 r / min, such as 500 r / min, 550 r / min, 600 r / min, 650 r / min, 700 r / min, 750 r / min, 800 r / min, and preferably a range value with any of the above values as the upper limit or lower limit.

[0050] In the present application, the stirring time of the first mixture is preferably 20-40 min, more preferably 30-35 min; the stirring time of the second mixture is preferably 2-5 min, more preferably 3-4 min; the stirring time of the third mixture is preferably 5-10 min, more preferably 6-9 min, and most preferably 7-8 min; and the stirring time after adding the water-resistant agent is preferably 1-5 min, more preferably 2-4 min, and most preferably 2-3 min.

[0051] The present application also provides an application of the paper coating paint described above in ink jet coding, in which the paper coating paint described above is coated on the surface of the paper, and then ink jet coding is used, and the ink is preferably UV ink or water-based ink, and in the present application, the coding is a common technical means in the art, and the present application will not be described here.

[0052] The present application provides a paper coating paint, which comprises the following raw materials in parts by weight: calcined kaolin 15-25 parts, alkaline nanoscale silica gel 10-15 parts, modified bentonite 20-25 parts, coating-grade talc powder 30-40 parts, high-gloss acrylic resin 2-5 parts, soybean protein 1-3 parts, SB styrene-butadiene latex 10-14 parts, ammonia 0.05-0.2 parts, potassium zirconium carbonate water-resistant agent 0.2-0.6 parts, mineral oil defoaming agent 0.05-0.2 parts, polyacrylic acid sodium dispersant 0.05-0.15 parts, and water 30-50 parts.

[0053] Compared with the prior art, the present application has the following advantages:

[0054] (1) Using calcined kaolin, modified bentonite to replace a large amount of basic nanoscale silica gel, under the premise of ensuring the quality of the code spraying, the cost of raw materials is significantly reduced. Calcined kaolin, modified bentonite makes the coating more loose, has a large specific surface area, and has strong adsorption capacity, avoids lateral diffusion of code spraying, and has high code clarity.

[0055] (2) The coating grade talc powder has a flaky structure, a large specific surface area, high coverage, good smoothness and gloss, high Tg glass transition temperature of high light acrylic resin, and high gloss. The penetration speed of the ink can also be adjusted to provide fast leveling for UV ink and water-based ink, and the code saturation is high.

[0056] (3) Using a new type of environmentally friendly and renewable resource of soy protein as a water retaining agent and an auxiliary adhesive. Based on the charge interaction between the amphoteric soy protein and the negatively charged pigment (calcined kaolin, basic nanoscale silica gel, modified bentonite), a favorable liquid viscosity structure, water retention capacity and lubricating capacity are provided for operation, a part of the adsorbed soy protein promotes rapid coating curing, and the coating structure with high void volume and uniform and stable void ratio is increased, thereby improving the ink absorbability, reducing the interference of water on the printing machine, providing fast leveling for UV ink and water-based ink, and having high code saturation.

[0057] (4) The coating formula in the present application uses cheap ordinary SB styrene-butadiene latex with high strength to meet the requirements, without using expensive PVAc latex and VAE latex.

[0058] (5) The reactive zirconium potassium carbonate water-resistant agent is crosslinked and cured through the active hydroxyl groups in the molecule and the hydroxyl groups in the SB styrene-butadiene latex, forming a network of cured film. At the same time, the zirconium substance prevents the affinity between the hydrophilic groups of the adhesive and water, achieving the purpose of water resistance, ensuring that the water-based ink is firmly adsorbed on the coating after code spraying, and there is no significant decrease in color density after the code is dried and immersed in water, improving the water resistance after code spraying. In addition, the reactive zirconium potassium carbonate water-resistant agent is an inorganic salt water-resistant agent, which is completely cured after being taken out, and effectively reduces the influence of residual formaldehyde of urea-formaldehyde resin (UF), modified melamine formaldehyde resin (MF) and glyoxal (Glyoxal) and other crosslinking agents on the human body and the environment.

[0059] In order to further illustrate the present application, the paper coating provided by the present application, its preparation method and application are described in detail in the following embodiments, but it cannot be understood as limiting the protection scope of the present application.

[0060] The following chemical raw materials of the following manufacturers' models were used in the examples and comparative series: Engelhard ANSILEX 93 calcined kaolin, Shandong KeHan silicon source KHM-205 basic nano silica gel, Jiangsu Fumiao MOSAICATCH HP670 modified bentonite, Changzhou Fengshu Chemical Coating-grade talc, Guangdong Chengming W2330 high-gloss acrylic resin, DuPont SoBind TM Balance soybean protein, BASF 7956SB styrene-butadiene latex, Shenzhen Ruicheng WR4500 zirconium potassium carbonate water-repellent agent, Weifang Tianfangshenghong WG-806 mineral oil defoamer, Aisen FLOYT3-310 sodium polyacrylate dispersant.

[0061] Example 1

[0062] A coating formulation including the following raw materials by weight:

[0063] calcined kaolin 15 parts, basic nano silica gel 15 parts, modified bentonite 25 parts, coating-grade talc 35 parts, high-gloss acrylic resin 3 parts, soybean protein 2 parts, SB styrene-butadiene latex 12 parts, ammonia 0.1 part, zirconium potassium carbonate water-repellent agent 0.3 part, mineral oil defoamer 0.1 part, sodium polyacrylate dispersant 0.08 part, water 32 parts.

[0064] Prepared according to the following steps:

[0065] (1) Add 0.08 parts of sodium polyacrylate dispersant, 0.1 part of ammonia, and 0.1 part of mineral oil defoamer to water at room temperature, and after stirring for 1 min, add 15 parts of calcined kaolin, 15 parts of basic nano silica gel, 25 parts of modified bentonite, 35 parts of coating-grade talc, and 3 parts of high-gloss acrylic resin in sequence, and after the addition is complete, stir and mix for 30 min at a stirring speed of 550 r / min;

[0066] (2) Add 2 parts of soybean protein, and stir and mix for 3 min at a stirring speed of 550 r / min;

[0067] (3) Add 12 parts of latex, and stir and mix for 7 min at a stirring speed of 550 r / min;

[0068] (3) Add 0.3 parts of zirconium potassium carbonate water-repellent agent, and stir and mix for 3 min at a stirring speed of 550 r / min, and after mixing, obtain the finished coating.

[0069] Example 2

[0070] A coating formulation including the following raw materials by weight:

[0071] Calcined kaolin 20 parts, basic nanoscale silica gel 12 parts, modified bentonite 22 parts, coating grade talc powder 32 parts, high light acrylic resin 2 parts, soybean protein 1 part, SB styrene-butadiene latex 10 parts, ammonia 0.08 parts, zirconium potassium carbonate water resistance agent 0.4 parts, mineral oil defoaming agent 0.15 parts, polyacrylic acid sodium dispersant 0.12 parts, water 40 parts.

[0072] Prepared according to the following steps:

[0073] (1) At room temperature, polyacrylic acid sodium dispersant 0.12 parts, ammonia 0.08 parts, mineral oil defoaming agent 0.15 parts were added to water, and after stirring for 1 min, calcined kaolin 20 parts, basic nanoscale silica gel 12 parts, modified bentonite 22 parts, coating grade talc powder 32 parts, high light acrylic resin 2 parts were added in turn, and after the addition was completed, the stirring and mixing time was 30 min, and the stirring speed was 700 r / min;

[0074] (2) Soybean protein 1 part was added, and the stirring and mixing time was 3 min, and the stirring speed was 700 r / min;

[0075] (3) Latex 10 parts was added, and the stirring and mixing time was 7 min, and the stirring speed was 700 r / min;

[0076] (4) Zirconium potassium carbonate water resistance agent 0.4 parts was added, and the stirring and mixing time was 3 min, and the stirring speed was 700 r / min, and after mixing, the finished paint was obtained.

[0077] Example 3

[0078] A paint formula, comprising the following raw materials by weight:

[0079] Calcined kaolin 25 parts, basic nanoscale silica gel 14 parts, modified bentonite 25 parts, coating grade talc powder 38 parts, high light acrylic resin 5 parts, soybean protein 3 parts, SB styrene-butadiene latex 14 parts, ammonia 0.15 parts, zirconium potassium carbonate water resistance agent 0.5 parts, mineral oil defoaming agent 0.2 parts, polyacrylic acid sodium dispersant 0.15 parts, water 45 parts.

[0080] Prepared according to the following steps:

[0081] (1) At room temperature, polyacrylic acid sodium dispersant 0.15 parts, ammonia 0.15 parts, mineral oil defoaming agent 0.2 parts were added to water, and after stirring for 1 min, calcined kaolin 25 parts, basic nanoscale silica gel 14 parts, modified bentonite 25 parts, coating grade talc powder 38 parts, high light acrylic resin 5 parts were added in turn, and after the addition was completed, the stirring and mixing time was 30 min, and the stirring speed was 800 r / min;

[0082] (2) Soybean protein 3 parts was added, and the stirring and mixing time was 3 min, and the stirring speed was 800 r / min;

[0083] (3) Add latex 14 parts, stirring mixing time 7 min, stirring speed 800 r / min;

[0084] (4) Add potassium zirconium carbonate water resistance agent 0.5 parts, stirring mixing time 3 min, stirring speed 800 r / min, after mixing to get finished paint.

[0085] Comparative Example 1

[0086] A paint formula, including the following raw materials by weight parts:

[0087] Calcined kaolin 15 parts, basic nanoscale silica gel 15 parts, modified bentonite 25 parts, coating grade talc powder 35 parts, high light acrylic resin 3 parts, soybean protein 0.5 parts, SB styrene-butadiene latex 12 parts, ammonia 0.1 parts, potassium zirconium carbonate water resistance agent 0.3 parts, mineral oil defoaming agent 0.1 parts, polyacrylic acid sodium dispersant 0.08 parts, water 32 parts.

[0088] Prepared according to the following steps:

[0089] (1) Add polyacrylic acid sodium dispersant 0.08 parts, ammonia 0.1 parts, mineral oil defoaming agent 0.1 parts to water at room temperature, after stirring for 1 min, add calcined kaolin 15 parts, basic nanoscale silica gel 15 parts, modified bentonite 25 parts, coating grade talc powder 35 parts, high light acrylic resin 3 parts, after adding, stirring mixing time 30 min, stirring speed 550 r / min;

[0090] (2) Add soybean protein 0.5 parts, stirring mixing time 3 min, stirring speed 550 r / min;

[0091] (3) Add latex 12 parts, stirring mixing time 7 min, stirring speed 550 r / min;

[0092] (4) Add potassium zirconium carbonate water resistance agent 0.3 parts, stirring mixing time 3 min, stirring speed 550 r / min, after mixing to get finished paint.

[0093] Comparative Example 2

[0094] A paint formula, including the following raw materials by weight parts:

[0095] Calcined kaolin 20 parts, basic nanoscale silica gel 12 parts, modified bentonite 22 parts, coating grade talc powder 32 parts, high light acrylic resin 2 parts, soybean protein 1 part, SB styrene-butadiene latex 10 parts, ammonia 0.08 parts, mineral oil defoaming agent 0.15 parts, polyacrylic acid sodium dispersant 0.12 parts, water 40 parts.

[0096] Prepared according to the following steps:

[0097] (1) At room temperature, add 0.12 parts of polyacrylic acid sodium dispersant, 0.08 parts of ammonia, 0.15 parts of mineral oil defoaming agent into water, start stirring for 1 min, then add 20 parts of calcined kaolin, 12 parts of alkaline nano silica, 22 parts of modified bentonite, 32 parts of coating grade talc, 2 parts of high gloss acrylic resin in turn, after adding, stir for 30 min, stirring speed 700 r / min;

[0098] (2) Add 1 part of soybean protein, stir for 3 min, stirring speed 700 r / min;

[0099] (3) Add 10 parts of latex, stir for 7 min, stirring speed 700 r / min;

[0100] Comparative Example 3

[0101] A coating formula, comprising the following raw materials by weight:

[0102] Calcined kaolin 30 parts, alkaline nano silica 18 parts, modified bentonite 26 parts, coating grade talc 45 parts, high gloss acrylic resin 5 parts, soybean protein 3 parts, SB butyl benzene latex 14 parts, ammonia 0.15 parts, zirconium potassium carbonate water resistance agent 0.5 parts, mineral oil defoaming agent 0.2 parts, polyacrylic acid sodium dispersant 0.15 parts, water 45 parts.

[0103] Prepared according to the following steps:

[0104] (1) At room temperature, add 0.15 parts of polyacrylic acid sodium dispersant, 0.15 parts of ammonia, 0.2 parts of mineral oil defoaming agent into water, start stirring for 1 min, then add 30 parts of calcined kaolin, 18 parts of alkaline nano silica, 26 parts of modified bentonite, 45 parts of coating grade talc, 5 parts of high gloss acrylic resin in turn, after adding, stir for 30 min, stirring speed 800 r / min;

[0105] (2) Add 3 parts of soybean protein, stir for 3 min, stirring speed 800 r / min;

[0106] (3) Add 14 parts of latex, stir for 7 min, stirring speed 800 r / min;

[0107] (4) Add 0.5 parts of zirconium potassium carbonate water resistance agent, stir for 3 min, stirring speed 800 r / min, after mixing, get the finished coating.

[0108] The coatings prepared in Examples 1, 2, 3, Comparative Examples 1, 2, 3 are coated on 300 grams of white card base paper, coating amount 10 g / m 2, dried, calendered at 15 kN / m, 120 degrees Celsius, and detected by a Honeywell handheld scanner. The decodability levels are shown in Table 1.

[0109] The detection standard: detected by a Honeywell handheld scanner, and the decodability levels are divided into five levels of A, B, C, D and F, wherein the decodability value of A level is the highest, and the inkjet effect is the best, followed by B, and F is the worst. The levels of C and above can meet the inkjet requirements.

[0110] Table 1: Decodability levels of the paint in the examples and the comparative examples of the present application

[0111]

[0112]

[0113] From the results in the table, it can be concluded that the test results of Examples 1-3 are significantly better than those of Comparative Examples 1-3, and the inkjet effect is better.

[0114] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A paper coating coating material, comprising the following raw materials in parts by weight:

2. Paper coating color according to claim 1, characterized in that The high gloss acrylic resin is a high gloss hard styrene-acrylic copolymer with a Tg glass transition temperature of 100-110°C.

3. The paper coating color according to claim 1, characterized in that The calcined kaolin has an oil absorption value of 80-100 g / g.

4. The paper coating color according to claim 1, characterized in that The water resistance agent is a potassium zirconium carbonate water resistance agent.

5. The paper coating color according to claim 1, characterized in that The defoaming agent is a mineral oil defoaming agent.

6. The paper coating color according to claim 1, characterized in that The dispersing agent is a sodium polyacrylate dispersing agent.

7. A preparation method of the paper coating coating material according to claim 1, comprising the following steps: A) mixing a dispersing agent, ammonia water, a defoaming agent and water, and then sequentially adding calcined kaolin, alkaline nano silica gel, modified bentonite, coating grade talc powder and high gloss acrylic resin, and stirring and mixing to obtain a first mixture; B) adding soybean protein to the first mixture and stirring and mixing to obtain a second mixture; C) adding SB styrene-butadiene latex to the second mixture and stirring and mixing to obtain a third mixture; D) adding a water resistance agent to the third mixture and stirring and mixing to obtain the paper coating coating material.

8. The preparation method according to claim 7, characterized in that, The paper coating coating material is prepared in a high-speed dispersion stirrer with a rotation speed of 500-800 r / min.

9. Use of the paper coating coating material according to any one of claims 1-6 in ink jet coding.

10. Use according to claim 9, wherein The paper coating coating material is coated on the surface of paper, and then ink jet coding is used.

Images