A coating liquid composition and its use in water- and oil-proof coated paper

Abstract

The application discloses a coating liquid composition, characterized in that the coating liquid composition comprises, in parts by weight, 15-30 parts of porcelain clay, 40-50 parts of heavy calcium carbonate, 30-35 parts of light calcium carbonate, 10-25 parts of coating latex, 3-10 parts of coating starch, 10-30 parts of waterproof and oil-proof paint, and 0.5-8 parts of micro-assistants; the waterproof and oil-proof paint comprises an acrylate emulsion and a mineral, wherein, in parts by weight, the acrylate emulsion is 100 parts of absolute dry, and the mineral is 0-50 parts; the application can improve the waterproof and oil-proof performance of the waterproof and oil-proof coated card paper, has good heat sealing performance, and can realize recycling of the waterproof and oil-proof coated card paper, and is good for the environment and has no pollution.

Description

Technical Field

[0001] This invention relates to the field of coating liquid technology, and more specifically, to a coating liquid composition and its application in waterproof and oil-resistant coated cardboard. Background Technology

[0002] As people become increasingly aware of environmental protection and health, replacing plastic with paper is gradually becoming an industry trend. However, due to the porosity of paper itself, its waterproof and oil-proof properties cannot fully meet the requirements. Covering the paper surface with a layer of PE or PP plastic film can meet the usage requirements, but it cannot completely solve society's concerns about health and environmental protection.

[0003] Water-based coating technology, which involves coating the surface of paper and paperboard to form a barrier coating, offers a good solution to the aforementioned problems. Currently, fluorocarbon and silicone coatings are widely used for waterproofing and oil repellency; however, the health hazards of fluoropolymer coatings are increasingly limiting their application, and the non-heat-sealability of fluorocarbon and silicone coatings also restricts their use.

[0004] To address the barrier properties of paper products, the search for safer, recyclable alternative water-based coatings has become a key focus for the industry. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a coating liquid composition and its application in waterproof and oil-proof coated cardboard, thereby achieving the following objectives: improving the waterproof and oil-proof performance of waterproof and oil-proof coated cardboard, improving heat-sealing properties, enabling the recycling of waterproof and oil-proof coated cardboard, and being environmentally friendly and pollution-free.

[0006] To solve the above technical problems, the present invention adopts the following technical solution:

[0007] A coating liquid composition, by weight, comprises: 15-30 parts kaolin, 40-50 parts heavy calcium carbonate, 30-35 parts light calcium carbonate, 10-25 parts coating latex, 3-10 parts coating starch, 10-30 parts waterproof and oil-proof coating, and 0.5-8 parts micro-additives.

[0008] The coating latex is styrene-butadiene latex, which is a white emulsion with a solid content of 49-51%; pH (25℃) of 6-7; viscosity (S62 / 60, 25℃) of 80-400; and residue on a 325-mesh sieve ≤0.05.

[0009] The coated starch is manufactured by Jiangxi Yufan, and its model is either YF401 or YF501.

[0010] The waterproof and oil-proof coating comprises acrylic emulsion and minerals, with 100 parts by weight of the acrylic emulsion and 0-50 parts by weight of the minerals, dried to the touch.

[0011] The solid content of the waterproof and oil-resistant coating is 30-70%;

[0012] The acrylic emulsion is manufactured by BASF AG, and its model number is HPB4110 with a solid content of 40%.

[0013] The mineral is one or more of kaolin, talc, and mica powder;

[0014] The aspect ratios of kaolin, talc, and mica are all ≥25.

[0015] The micro-additives, by weight, include: 0.5-1 parts dispersant, 0.2-1 parts CMC (sodium carboxymethyl cellulose), 0.3-1 parts lubricant, 0.3-1 parts water-resistant agent, 0.1-1 parts dye, and 0-1 parts interfacial tension modifier for coatings;

[0016] The dispersant was purchased from Shandong Aosai Industrial Co., Ltd., model KCD-2188. It is a light yellow transparent liquid with a solid content ≥41%, a viscosity of 150-500 mPa·s (25℃), a pH of 6.0-8.0, and a specific gravity of 1.0-1.4.

[0017] The lubricant was purchased from Shouguang Hairun Trade Co., Ltd., model HY-2000, with a solid content ≥25%, viscosity ≤50 mPa·s, pH 8.0-10.5, and specific gravity 1.00-1.05;

[0018] The water-resistant agent was purchased from Jining Mingsheng New Materials Co., Ltd., model DS-KS618A, with a solid content of 48±2%, viscosity ≤50 mPa·s (25℃, S61 / 100), pH of 6.0-9.0, and specific gravity of 1.15-1.20;

[0019] The coating liquid composition has a solid content of 50%, an air content of less than 10%, and a surface tension of less than 20 mN / m;

[0020] The application of a coating liquid composition in waterproof and oil-resistant coated cardboard includes: front pre-coating, front first functional coating, reverse pre-coating, and reverse first functional coating.

[0021] The front pre-coating process involves uniformly spraying the coating liquid composition onto the front side of the base paper using a spray-type doctor blade coating machine, followed by scraping a uniform coating of thickness and basis weight onto the paper surface using a doctor blade. After coating, the coating undergoes non-contact drying via hot air drying, with the temperature controlled at 200-450℃. After drying to the process-set dryness, the coating is further dried in a conditioning cylinder to address paper warping issues.

[0022] The basis weight of the base paper is 170-400 g / m². 2 ;

[0023] The coating weight of the pre-coated surface is 6-15 g / m². 2 ;

[0024] The first functional coating on the front side is applied using a curtain coating method, which uniformly coats a functional barrier coating on the front side of the base paper. After coating, the coating is dried non-contactly with hot air, with the temperature controlled at 200-450℃. After drying to the process set dryness, it is cooled non-contactly with cold air, with the temperature controlled at 25-35℃. Finally, the paper warping problem is calibrated using a conditioning cylinder.

[0025] The functional coating, an acrylic barrier coating, is manufactured by Solis, USA, and has a solid content of 50-53%.

[0026] The coating weight of the first functional coating on the front side is 6-15 g / m². 2 ;

[0027] The reverse pre-coating is carried out by spraying with a doctor blade. The coating liquid composition or coating starch is evenly sprayed onto the reverse side of the paper, and then a doctor blade is used to scrape a coating with uniform thickness and basis weight on the paper surface. The coating is then dried non-contactly by hot air drying, with the temperature controlled at 200-450℃. After drying to the process set dryness, it is further dried in a conditioning cylinder to correct paper warping.

[0028] The coated starch is manufactured by Jiangxi Yufan, and its model is either YF401 or YF501, with a solid content of 50%.

[0029] The coating weight on the reverse side pre-coating is 6-15 g / m². 2 ;

[0030] The first functional coating on the reverse side is applied using a spray-type doctor blade coating method. The functional coating is evenly sprayed onto the paper surface, and then the doctor blade spreads the coating on the paper surface to create a coating with uniform thickness and basis weight. After coating, the coating undergoes non-contact drying with hot air, with the temperature controlled at 200-450℃. After drying to the process set dryness, it is then cooled with non-contact cold air, with the temperature controlled at 25-35℃. Finally, the paper warping is calibrated using a conditioning cylinder.

[0031] The functional coating, an acrylic barrier coating, is manufactured by Thorinex Technologies, Inc. (USA), and has a solid content of 50-53%.

[0032] The coating weight of the first functional coating on the reverse side is 4-10 g / m². 2 ;

[0033] The application of a coating liquid composition in waterproof and oil-resistant coated cardboard also includes a second functional coating on the front side;

[0034] The second functional coating on the front side is applied using a spray-type doctor blade coating method. The functional coating is evenly sprayed onto the paper surface, and then the doctor blade spreads the coating on the paper surface to create a coating with uniform thickness and basis weight. After coating, the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 200-450℃. After drying to the process set dryness, it is then cooled non-contactly by cold air, with the cold air cooling temperature controlled at 25-35℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0035] The functional coating is an acrylic emulsion manufactured by BASF, model HPB4130, with a solid content of 40%.

[0036] The coating weight of the second functional coating on the front side is 4-10 g / m². 2 .

[0037] Preferably, a coating liquid composition comprises, by weight: 15-30 parts kaolin, 40-50 parts heavy calcium carbonate, 30-35 parts light calcium carbonate, 10-25 parts coating latex, 3-10 parts coating starch, 10-30 parts waterproof and oil-proof coating, 0.5-8 parts micro-additives, and 1.5-2.5 parts modified polyvinyl alcohol;

[0038] The method for preparing the modified polyvinyl alcohol includes: preparing betaine acrylic acid monomer and branching treatment;

[0039] To prepare the betaine acrylic acid monomer, N,N-dimethylaminoethyl acrylate and acetone are added to a reaction vessel. The temperature of the reaction vessel is controlled at 40-50℃, and the mixture is stirred for 10-30 minutes. Then, while stirring, an acetone solution of 1,3-propanesulfonate lactone is added dropwise. After the addition is completed, stirring is continued for 10-11 hours. The mixture is then cooled, filtered, washed, and the filter residue is vacuum dried to obtain the betaine acrylic acid monomer.

[0040] In the preparation of the acrylate betaine monomer, the mass ratio of acetone solution containing N,N-dimethylaminoethyl acrylate, acetone, and 1,3-propanesulfonate lactone is 6-7:42-45:14-16.

[0041] The concentration of 1,3-propanesulfonate lactone in the acetone solution is 26-28 wt%.

[0042] The acetone solution of the 1,3-propanesulfonate lactone was added at a rate of 2-2.5 g / min.

[0043] The branching treatment involves adding polyvinyl alcohol 1788 and deionized water to a reaction vessel, sealing the vessel, purging the vessel with nitrogen, and then introducing nitrogen until the pressure inside the vessel reaches 0.14-0.16 MPa. The temperature of the reaction vessel is controlled at 40-50°C, and after stirring for 10-30 minutes, potassium persulfate is added, and stirring continues for 40-60 minutes. Simultaneously, an aqueous solution of acrylamide and an aqueous solution of acrylate betaine monomer are added dropwise. After the acrylamide aqueous solution is added, the temperature of the reaction vessel is increased to 50-60°C, and stirring continues for 5-6 hours. Sodium hydroxide is added, and the temperature of the reaction vessel is increased to 110-120°C, and stirring continues for 1-1.5 hours. The reaction vessel is then opened, cooled, and the water is removed by vacuum distillation. The mixture is then ground to obtain modified polyvinyl alcohol.

[0044] The branching treatment uses a mass ratio of 5-5.5:25-260:1-1.1:32-35:3.5-4:0.9-1 for polyvinyl alcohol 1788, deionized water, potassium persulfate, acrylamide aqueous solution, acrylate betaine monomer aqueous solution, and sodium hydroxide.

[0045] The concentration of acrylamide in the acrylamide aqueous solution is 28-28 wt%;

[0046] The acrylamide aqueous solution was added at a rate of 3-3.5 g / min;

[0047] The concentration of betaine monomer in the aqueous solution of the acrylate betaine monomer is 6-6.5 wt%.

[0048] The dropping rate of the aqueous solution of acrylate betaine monomer is 0.4-0.45 g / min.

[0049] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0050] (1) The coating liquid composition of the present invention is a biodegradable food-grade functional coating. When it is coated on the surface of the base paper, the resulting water-resistant and oil-resistant functional coating is green, environmentally friendly and biodegradable. Its waste can be composted and biodegraded, which is good for the environment and does not cause pollution.

[0051] (2) The coating liquid composition of the present invention can realize the recycling of pulp, reduce deforestation, and reduce carbon emissions;

[0052] (3) After applying the coating liquid composition of the present invention to the preparation of waterproof and oil-resistant coated cardboard, the prepared waterproof and oil-resistant coated cardboard has a moisture content of 7% and a density of 0.76-0.82 g / cm. 3 Whiteness is 78-80%, roughness is ≤2.5, smoothness is ≥15S, and edge penetration is ≤1.5kg / m. 2 Surface absorption 180s (forward / reverse) ≤2 / 5g / m 2 Surface absorption ≤10g / m³ for 30 minutes 2 The ink absorbency (reverse) is 20-28%, the printing surface strength (reverse) is ≥1.6m / s, the folding endurance (transverse) is ≥50 times, and the bursting strength index is ≥1.8kPa·m. 2 / g, interlayer bonding ≥200J / m 2 The stiffness (cross / longitudinal) is ≥2.2 / 4.4 mN·m, the oil resistance kit value on the front side is 8-14, and the heat-sealing performance is such that the heat-sealed surface does not separate when pulled apart; preferably, the density of the prepared waterproof and oil-resistant coated cardboard for cold drink paper cups is 0.82 g / cm. 3 Whiteness 80%, roughness ≤2.2, smoothness ≥20S, edge penetration ≤1.3kg / m 2 Flexural endurance (transverse) ≥ 55 cycles, bursting index ≥ 2.1 kPa·m 2 / g, interlayer bonding ≥230J / m 2 Stiffness (transverse / longitudinal) ≥2.3 / 4.5 mN·m, frontal oil resistance kit value 14;

[0053] (4) The coating liquid composition of the present invention is applied to the preparation of waterproof and oil-proof coated cardboard. After coating and drying, non-contact cold air cooling and drying are respectively configured to maintain the performance of the waterproof and oil-proof coating and improve the use effect of waterproof and oil-proof coated cardboard. Detailed Implementation

[0054] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0055] Example 1

[0056] This embodiment provides a coating liquid composition, which, by weight, includes: 20 parts kaolin, 50 parts heavy calcium carbonate, 30 parts light calcium carbonate, 15 parts coating latex, 5 parts coating starch, 20 parts waterproof and oil-proof coating, and 3 parts micro-additives.

[0057] The coating latex is styrene-butadiene latex, which is a white emulsion with a solid content of 50%; pH (25℃) is 6.8; viscosity (S62 / 60, 25℃) is 100; and residue on a 325-mesh sieve is ≤0.05.

[0058] The coated starch is manufactured by Jiangxi Yufan, and its model number is YF401.

[0059] The waterproof and oil-proof coating is an acrylic emulsion with a solid content of 40%.

[0060] The acrylic emulsion is manufactured by BASF AG, and its model number is HPB4110 with a solid content of 40%.

[0061] The mineral in question is kaolinite, with a diameter-to-thickness ratio ≥25.

[0062] The micro-additives, by weight, include: 0.5 parts dispersant, 0.2 parts CMC (sodium carboxymethyl cellulose), 0.3 parts lubricant, 0.3 parts water-resistant agent, and 0.1 parts dye;

[0063] The dispersant was purchased from Shandong Aosai Industrial Co., Ltd., model KCD-2188. It is a light yellow transparent liquid with a solid content ≥41%, a viscosity of 150-500 mPa·s (25℃), a pH of 6.0-8.0, and a specific gravity of 1.0-1.4.

[0064] The lubricant was purchased from Shouguang Hairun Trade Co., Ltd., model HY-2000, with a solid content ≥25%, viscosity ≤50 mPa·s, pH 8.0-10.5, and specific gravity 1.00-1.05;

[0065] The water-resistant agent was purchased from Jining Mingsheng New Materials Co., Ltd., model DS-KS618A, with a solid content of 48±2%, viscosity ≤50 mPa·s (25℃, S61 / 100), pH of 6.0-9.0, and specific gravity of 1.15-1.20.

[0066] The coating liquid composition has a solid content of 50%, an air content of less than 10%, a surface tension of less than 20 mN / m, and a temperature of less than 35°C. The coating liquid composition has waterproof, oil-proof, and heat-sealing properties, is biodegradable, and causes no environmental pollution.

[0067] Example 2

[0068] This embodiment provides a coating liquid composition, which, by weight, includes: 25 parts kaolin, 40 parts heavy calcium carbonate, 35 parts light calcium carbonate, 15 parts coating latex, 6 parts coating starch, 20 parts waterproof and oil-proof coating, and 3 parts micro-additives.

[0069] The coating latex is styrene-butadiene latex, which is a white emulsion with a solid content of 50%; pH (25℃) is 6.8; viscosity (S62 / 60, 25℃) is 100; and residue on a 325-mesh sieve is ≤0.05.

[0070] The coated starch is manufactured by Jiangxi Yufan, and its model number is YF501.

[0071] The waterproof and oil-proof coating comprises acrylic emulsion and minerals, with 100 parts by weight of the acrylic emulsion (octane dry) and 30 parts by weight of the minerals, resulting in a solid content of 45%.

[0072] The acrylic emulsion is manufactured by BASF AG, and its model number is HPB4110 with a solid content of 40%.

[0073] The mineral is kaolinite with a diameter-to-thickness ratio ≥25;

[0074] The micro-additives, by weight, include: 0.8 parts dispersant, 0.6 parts CMC (sodium carboxymethyl cellulose), 0.5 parts lubricant, 0.5 parts water-resistant agent, 0.5 parts dye, and 0.5 parts coating interfacial tension modifier;

[0075] The dispersant was purchased from Shandong Aosai Industrial Co., Ltd., model KCD-2188. It is a light yellow transparent liquid with a solid content ≥41%, a viscosity of 150-500 mPa·s (25℃), a pH of 6.0-8.0, and a specific gravity of 1.0-1.4.

[0076] The lubricant was purchased from Shouguang Hairun Trade Co., Ltd., model HY-2000, with a solid content ≥25%, viscosity ≤50 mPa·s, pH 8.0-10.5, and specific gravity 1.00-1.05;

[0077] The water-resistant agent was purchased from Jining Mingsheng New Materials Co., Ltd., model DS-KS618A, with a solid content of 48±2%, viscosity ≤50mPa·s (25℃, S61 / 100), pH of 6.0-9.0, and specific gravity of 1.15-1.20.

[0078] The coating liquid composition has a solid content of 55%, an air content of less than 10%, a surface tension of less than 20 mN / m, and a temperature of less than 35°C. The coating liquid composition has waterproof, oil-proof, and heat-sealing properties, is biodegradable, and causes no environmental pollution.

[0079] Example 3

[0080] This embodiment provides a coating liquid composition, which, by weight, includes: 15 parts kaolin, 50 parts heavy calcium carbonate, 35 parts light calcium carbonate, 15 parts coating latex, 9 parts coating starch, 20 parts waterproof and oil-proof coating, and 3 parts micro-additives.

[0081] The coating latex is styrene-butadiene latex, which is a white emulsion with a solid content of 50%; pH (25℃) is 6.8; viscosity (S62 / 60, 25℃) is 100; and residue on a 325-mesh sieve is ≤0.05.

[0082] The coated starch is manufactured by Jiangxi Yufan, and its model number is YF401.

[0083] The waterproof and oil-proof coating comprises acrylic emulsion and minerals, with 100 parts by weight of the acrylic emulsion (octane dry) and 50 parts by weight of the minerals, resulting in a solid content of 55%.

[0084] The acrylic emulsion is manufactured by BASF AG, and its model number is HPB4110 with a solid content of 40%.

[0085] The mineral is talc powder, with a diameter-to-thickness ratio ≥25;

[0086] The micro-additives, by weight, include: 1 part dispersant, 1 part CMC (sodium carboxymethyl cellulose), 1 part lubricant, 1 part water-resistant agent, 1 part dye, and 1 part coating interfacial tension modifier.

[0087] The dispersant was purchased from Shandong Aosai Industrial Co., Ltd., model KCD-2188. It is a light yellow transparent liquid with a solid content ≥41%, a viscosity of 150-500 mPa·s (25℃), a pH of 6.0-8.0, and a specific gravity of 1.0-1.4.

[0088] The lubricant was purchased from Shouguang Hairun Trade Co., Ltd., model HY-2000, with a solid content ≥25%, viscosity ≤50 mPa·s, pH 8.0-10.5, and specific gravity 1.00-1.05;

[0089] The water-resistant agent was purchased from Jining Mingsheng New Materials Co., Ltd., model DS-KS618A, with a solid content of 48±2%, viscosity ≤50 mPa·s (25℃, S61 / 100), pH of 6.0-9.0, and specific gravity of 1.15-1.20.

[0090] The coating liquid composition has a solid content of 60%, an air content of less than 10%, a surface tension of less than 20 mN / m, and a temperature of less than 35°C. The coating liquid composition has waterproof, oil-proof, and heat-sealing properties, is biodegradable, and causes no environmental pollution.

[0091] Example 4

[0092] This embodiment provides a coating liquid composition, which, by weight, includes: 25 parts kaolin, 40 parts heavy calcium carbonate, 35 parts light calcium carbonate, 15 parts coating latex, 6 parts coating starch, 20 parts waterproof and oil-proof coating, 3 parts micro-additives, and 2 parts modified polyvinyl alcohol.

[0093] The coating latex is styrene-butadiene latex, which is a white emulsion with a solid content of 50%; pH (25℃) is 6.8; viscosity (S62 / 60, 25℃) is 100; and residue on a 325-mesh sieve is ≤0.05.

[0094] The coated starch is manufactured by Jiangxi Yufan, and its model number is YF501.

[0095] The waterproof and oil-proof coating comprises acrylic emulsion and minerals, with 100 parts by weight of the acrylic emulsion (octane dry) and 30 parts by weight of the minerals, resulting in a solid content of 45%.

[0096] The acrylic emulsion is manufactured by BASF AG, and its model number is HPB4110 with a solid content of 40%.

[0097] The mineral is kaolinite with a diameter-to-thickness ratio ≥25;

[0098] The micro-additives, by weight, include: 0.8 parts dispersant, 0.6 parts CMC (sodium carboxymethyl cellulose), 0.5 parts lubricant, 0.5 parts water-resistant agent, 0.5 parts dye, and 0.5 parts coating interfacial tension modifier;

[0099] The dispersant was purchased from Shandong Aosai Industrial Co., Ltd., model KCD-2188. It is a light yellow transparent liquid with a solid content ≥41%, a viscosity of 150-500 mPa·s (25℃), a pH of 6.0-8.0, and a specific gravity of 1.0-1.4.

[0100] The lubricant was purchased from Shouguang Hairun Trade Co., Ltd., model HY-2000, with a solid content ≥25%, viscosity ≤50 mPa·s, pH 8.0-10.5, and specific gravity 1.00-1.05;

[0101] The water-resistant agent was purchased from Jining Mingsheng New Materials Co., Ltd., model DS-KS618A, with a solid content of 48±2%, viscosity ≤50 mPa·s (25℃, S61 / 100), pH of 6.0-9.0, and specific gravity of 1.15-1.20;

[0102] The method for preparing the modified polyvinyl alcohol is as follows:

[0103] (1) Preparation of betaine monomer: Add 6-7g of N,N-dimethylaminoethyl acrylate and 42-45g of acetone to the reaction vessel. Control the temperature of the reaction vessel to 40-50℃ and the stirring speed to 100-300rpm. Stir for 10-30min, and then add 14-16g of acetone solution of 1,3-propanesulfonate lactone dropwise while stirring. Control the dropping speed to 2-2.5g / min. After the dropping is finished, continue stirring for 10-11h. Cool naturally to room temperature, filter, and wash the filter residue with acetone 3-4 times. Use 35-40g of acetone for each wash. After washing, dry at a temperature of 60-80℃ and a vacuum of 0.09-0.095MPa to obtain betaine monomer;

[0104] The concentration of 1,3-propanesulfonate lactone in the acetone solution is 26-28 wt%.

[0105] (2) Branching treatment: Add 5-5.5g of polyvinyl alcohol 1788 and 250-260g of deionized water to the reactor. Seal the reactor and purge the reactor with nitrogen until the pressure inside is 0.14-0.16MPa. Control the temperature of the reactor to 40-50℃ and the stirring speed to 100-300rpm. After stirring for 10-30min, add 1-1.1g of potassium persulfate and continue stirring for 40-60min. At the same time, add 32-35g of acrylamide aqueous solution and 3.5-4g of acrylic acid betaine monomer aqueous solution dropwise to control the propylene content. The dropwise addition rate of the acrylamide aqueous solution is 3-3.5 g / min, and the dropwise addition rate of the acrylic acid betaine monomer aqueous solution is 0.4-0.45 g / min. After the acrylamide aqueous solution is added, the temperature of the reactor is increased to 50-60℃, the stirring speed is increased to 100-300 rpm, and stirring is continued for 5-6 hours. Then, 0.9-1 g of sodium hydroxide is added, the temperature of the reactor is increased to 110-120℃, and stirring is continued for 1-1.5 hours. The reactor is then opened and allowed to cool naturally to room temperature. Water is removed by vacuum distillation, and the mixture is ground to a particle size of 10-30 μm to obtain modified polyvinyl alcohol.

[0106] The concentration of acrylamide in the acrylamide aqueous solution is 28-28 wt%;

[0107] The concentration of betaine monomer in the aqueous solution of the acrylate betaine monomer is 6-6.5 wt%.

[0108] The coating liquid composition has a solid content of 58%, an air content of less than 10%, a surface tension of less than 20 mN / m, and a temperature of less than 35°C. The coating liquid composition has waterproof, oil-proof, and heat-sealing properties, is biodegradable, and causes no environmental pollution.

[0109] Example 5

[0110] The application of the coating liquid composition of Example 1 in waterproof and oil-proof coated cardboard for cold drink paper cups: by coating the coating liquid composition onto the base paper using a coating process to form a waterproof and oil-proof coating layer, waterproof and oil-proof coated cardboard is obtained. Beautiful patterns can be printed on the outside of the waterproof and oil-proof coated cardboard, and it can meet the requirements of refrigeration, hot drinks, and hot oil isolation effect.

[0111] The application of the coating liquid composition of Example 1 in waterproof and oil-resistant coated cardboard for cold drink paper cups is as follows:

[0112] 1. Front-side pre-coating: The coating liquid composition of Example 1 is uniformly sprayed onto the front side of the base paper using a spray-type doctor blade coating machine, and then a uniform coating with consistent thickness and basis weight is scraped onto the paper surface by a doctor blade; after coating, the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 220°C, and dried to the process set dryness, and then dried and calibrated by a conditioning cylinder to address paper warping issues;

[0113] The basis weight of the base paper is 170 g / m². 2 ;

[0114] The coating weight of the pre-coated surface is 6 g / m². 2 ;

[0115] 2. First functional coating on the front side: A curtain coating is used to uniformly coat a functional barrier coating on the front side of the base paper. After coating, the coating is dried non-contactly with hot air, with the temperature controlled at 220℃. After drying to the process set dryness, it is cooled non-contactly with cold air, with the temperature controlled at 25℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0116] The functional coating, an acrylic barrier coating, is manufactured by Solis, USA, and has a solid content of 50%.

[0117] The coating weight of the first functional coating on the front side is 6 g / m². 2 ;

[0118] 3. Reverse pre-coating: A spray-type doctor blade coating is used. The coating liquid composition of Example 1 is evenly sprayed onto the reverse side of the coated paper, and then a doctor blade is used to scrape a coating with uniform thickness and basis weight on the paper surface. The coating is dried non-contactly by hot air drying. The temperature of the hot air drying is controlled at 220°C. After drying to the process set dryness, it is further dried in a conditioning tank to calibrate the paper warping problem.

[0119] The coating weight of the reverse pre-coating is 6 g / m². 2 ;

[0120] 4. First functional coating on the reverse side: A spray-type doctor blade coating is used to evenly spray the functional coating onto the paper surface, and then the doctor blade spreads the coating on the paper surface to create a coating with uniform thickness and basis weight. After coating, the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 220℃. After drying to the process set dryness, it is then cooled non-contactly by cold air cooling, with the cold air cooling temperature controlled at 25℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0121] The functional coating, an acrylic barrier coating, is manufactured by Solis, USA, and has a solid content of 50%.

[0122] The coating weight of the first functional coating on the reverse side is 6 g / m². 2 ;

[0123] 5. Second functional coating on the front side: A spray-type doctor blade coating is used to evenly spray the functional coating onto the paper surface, and then the doctor blade spreads a coating of uniform thickness and basis weight on the paper surface. After coating, the coating is dried by hot air drying in a non-contact manner, with the hot air drying temperature controlled at 220℃. After drying to the process set dryness, it is then cooled by non-contact cold air, with the cold air cooling temperature controlled at 25℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0124] The functional coating is an acrylic emulsion manufactured by BASF, model HPB4130, with a solid content of 40%.

[0125] The coating weight of the second functional coating on the front side is 4 g / m². 2 ;

[0126] The waterproof and oil-resistant coated cardboard for cold drink cups prepared in this embodiment has a moisture content of 7% and a density of 0.76 g / cm³. 3 Whiteness is 78%, roughness is ≤2.5, smoothness is ≥15S, and edge penetration is ≤1.5kg / m. 2 Surface absorption 180s (forward / reverse) ≤2 / 5g / m 2 Surface absorption ≤10g / m³ for 30 minutes 2 The ink absorbency (reverse) is 20-28%, the printing surface strength (reverse) is ≥1.6m / s, the folding endurance (transverse) is ≥50 times, and the bursting strength index is ≥1.8kPa·m. 2 / g, interlayer bonding ≥200J / m 2 Stiffness (horizontal / longitudinal) ≥2.2 / 4.4 mN·m, front oil resistance kit value 12, heat seal performance is that the heat seal surface should not separate when pulled apart.

[0127] Example 6

[0128] The application of the coating liquid composition of Example 2 in waterproof and oil-proof coated cardboard for hot beverage paper cups: by coating the coating liquid composition onto the base paper using a coating process to form a waterproof and oil-proof coating layer, waterproof and oil-proof coated cardboard is obtained. Beautiful patterns can be printed on the outside of the waterproof and oil-proof coated cardboard, and it can meet the requirements of refrigeration, hot beverage, and hot oil isolation effects.

[0129] The application of the coating liquid composition of Example 2 in waterproof and oil-resistant coated cardboard for hot beverage paper cups is as follows:

[0130] 1. Front-side pre-coating: The coating liquid composition of Example 2 is uniformly sprayed onto the front side of the base paper using a spray-type doctor blade coating machine, and then a uniform coating with consistent thickness and basis weight is scraped onto the paper surface by a doctor blade; after coating, the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 280°C, and dried to the process set dryness, and then dried and calibrated by a conditioning cylinder to address paper warping issues;

[0131] The basis weight of the base paper is 200 g / m². 2 ;

[0132] The coating weight of the pre-coated surface is 8 g / m². 2 ;

[0133] 2. First functional coating on the front side: A curtain coating is used to uniformly coat a functional barrier coating on the front side of the base paper. After coating, the coating is dried non-contactly with hot air, with the temperature controlled at 280℃. After drying to the process set dryness, it is cooled non-contactly with cold air, with the temperature controlled at 28℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0134] The functional coating, an acrylic barrier coating, is manufactured by Sorely Chemicals, USA, and has a solid content of 51%.

[0135] The coating weight of the first functional coating on the front side is 8 g / m². 2 ;

[0136] 3. Reverse pre-coating: A spray-type doctor blade coating is used to evenly spray the coating starch onto the reverse side of the paper, and then the doctor blade scrapes a coating of uniform thickness and basis weight onto the paper surface; the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 280℃. After drying to the process set dryness, it is further dried in a conditioning cylinder to correct paper warping issues.

[0137] The coated starch was manufactured by Jiangxi Yufan, and its model number was YF401 with a solid content of 50%.

[0138] The coating weight of the reverse pre-coating is 8 g / m². 2 ;

[0139] 4. First functional coating on the reverse side: A spray-type doctor blade coating is used to evenly spray the functional coating onto the paper surface, and then the doctor blade spreads the coating on the paper surface to create a coating with uniform thickness and basis weight. After coating, the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 280℃. After drying to the process set dryness, it is then cooled non-contactly by cold air cooling, with the cold air cooling temperature controlled at 28℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0140] The functional coating, an acrylic barrier coating, is manufactured by Sorely Chemicals, USA, and has a solid content of 51%.

[0141] The coating weight of the first functional coating on the reverse side is 6 g / m². 2 ;

[0142] 5. Second functional coating on the front side: A spray-type doctor blade coating is used to evenly spray the functional coating onto the paper surface, and then the doctor blade spreads a coating of uniform thickness and basis weight on the paper surface. After coating, the coating is dried by hot air drying in a non-contact manner, with the hot air drying temperature controlled at 220℃. After drying to the process set dryness, it is then cooled by non-contact cold air, with the cold air cooling temperature controlled at 28℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0143] The functional coating is an acrylic emulsion manufactured by BASF, model HPB4130, with a solid content of 40%.

[0144] The coating weight of the second functional coating on the front side is 6 g / m². 2 ;

[0145] The waterproof and oil-resistant coated cardboard for cold drink cups prepared in this embodiment has a moisture content of 7% and a density of 0.76 g / cm³. 3 Whiteness is 78%, roughness is ≤2.5, smoothness is ≥15S, and edge penetration is ≤1.5kg / m. 2 Surface absorption 180s (forward / reverse) ≤2 / 5g / m 2 Surface absorption ≤10g / m³ for 30 minutes 2 The ink absorbency (reverse) is 20-28%, the printing surface strength (reverse) is ≥1.6m / s, the folding endurance (transverse) is ≥50 times, and the bursting strength index is ≥1.8kPa·m. 2 / g, interlayer bonding ≥200J / m 2 Stiffness (horizontal / longitudinal) ≥2.2 / 4.4 mN·m, front oil resistance kit value 10, heat seal performance is that the heat seal surface should not separate when pulled apart.

[0146] Example 7

[0147] The application of the coating liquid composition of Example 3 in waterproof and oil-proof coated cardboard for food packaging boxes involves coating the coating liquid composition onto the base paper using a coating process to form a waterproof and oil-proof coating layer, thereby obtaining waterproof and oil-proof coated cardboard. Beautiful patterns can be printed on the outside of the waterproof and oil-proof coated cardboard, and it can meet the requirements for refrigeration, hot drinks, and hot oil isolation effects.

[0148] The application of the coating liquid composition of Example 3 in waterproof and oil-resistant coated cardboard for food packaging boxes is as follows:

[0149] 1. Front-side pre-coating: The coating liquid composition of Example 3 is uniformly sprayed onto the front side of the base paper using a spray-type doctor blade coating machine, and then a uniform coating with consistent thickness and basis weight is scraped onto the paper surface by a doctor blade; after coating, the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 350°C, and dried to the process set dryness, and then dried and calibrated by a conditioning cylinder to address paper warping issues;

[0150] The basis weight of the base paper is 220 g / m². 2 ;

[0151] The coating weight of the pre-coated surface is 10 g / m². 2 ;

[0152] 2. First functional coating on the front side: A curtain coating is used to uniformly coat a functional barrier coating on the front side of the base paper. After coating, the coating is dried non-contactly with hot air, with the temperature controlled at 350℃. After drying to the process set dryness, it is cooled non-contactly with cold air, with the temperature controlled at 30℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0153] The functional coating, an acrylic barrier coating, is manufactured by Solis, USA, and has a solid content of 52.5%.

[0154] The coating weight of the first functional coating on the front side is 10 g / m². 2 ;

[0155] 3. Reverse pre-coating: A spray-type doctor blade coating is used. The coating liquid composition of Example 3 is evenly sprayed onto the reverse side of the coated paper, and then a doctor blade is used to scrape a coating with uniform thickness and basis weight on the paper surface. The coating is dried non-contactly by hot air drying. The temperature of the hot air drying is controlled at 350°C. After drying to the process set dryness, it is further dried in a conditioning cylinder to calibrate the paper warping problem.

[0156] The coating weight of the reverse pre-coating is 10 g / m². 2 ;

[0157] 4. First functional coating on the reverse side: A spray-type doctor blade coating is used to evenly spray the functional coating onto the paper surface, and then the doctor blade spreads the coating on the paper surface to create a coating with uniform thickness and basis weight. After coating, the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 350℃. After drying to the process set dryness, it is then cooled non-contactly by cold air cooling, with the cold air cooling temperature controlled at 30℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0158] The functional coating, an acrylic barrier coating, is manufactured by Solis, USA, and has a solid content of 52.5%.

[0159] The coating weight of the first functional coating on the reverse side is 8 g / m². 2 ;

[0160] The waterproof and oil-resistant coated cardboard for cold drink cups prepared in this embodiment has a moisture content of 7% and a density of 0.76 g / cm³. 3 Whiteness is 78%, roughness is ≤2.5, smoothness is ≥15S, and edge penetration is ≤1.5kg / m. 2 Surface absorption 180s (forward / reverse) ≤2 / 5g / m 2 Surface absorption ≤10g / m³ for 30 minutes 2 The ink absorbency (reverse) is 20-28%, the printed surface strength (reverse) is ≥1.6m / s, the folding endurance (transverse) is ≥50 times, and the bursting strength index is ≥1.8kPa·m. 2 / g, interlayer bonding ≥200J / m 2 Stiffness (horizontal / longitudinal) ≥2.2 / 4.4 mN·m, front oil resistance kit value 8, heat seal performance is that the heat seal surface should not separate when pulled apart.

[0161] Example 8

[0162] The application of the coating liquid composition of Example 4 in waterproof and oil-proof coated cardboard for hot beverage paper cups: by coating the coating liquid composition onto the base paper using a coating process to form a waterproof and oil-proof coating layer, waterproof and oil-proof coated cardboard is obtained. Beautiful patterns can be printed on the outside of the waterproof and oil-proof coated cardboard, and it can meet the requirements of refrigeration, hot beverage, and hot oil isolation effects.

[0163] The application of the coating liquid composition of Example 4 in waterproof and oil-resistant coated cardboard for hot beverage paper cups is as follows:

[0164] 1. Front-side pre-coating: The coating liquid composition of Example 4 is uniformly sprayed onto the front side of the base paper using a spray-type doctor blade coating machine, and then a uniform coating with consistent thickness and basis weight is scraped onto the paper surface by a doctor blade; after coating, the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 280°C, and dried to the process set dryness, and then dried and calibrated by a conditioning cylinder to address paper warping issues;

[0165] The basis weight of the base paper is 200 g / m². 2 ;

[0166] The coating weight of the pre-coated surface is 8 g / m². 2 ;

[0167] 2. First functional coating on the front side: A curtain coating is used to uniformly coat a functional barrier coating on the front side of the base paper. After coating, the coating is dried non-contactly with hot air, with the temperature controlled at 280℃. After drying to the process set dryness, it is cooled non-contactly with cold air, with the temperature controlled at 28℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0168] The functional coating, an acrylic barrier coating, is manufactured by Sorely Chemicals, USA, and has a solid content of 51%.

[0169] The coating weight of the first functional coating on the front side is 8 g / m². 2 ;

[0170] 3. Reverse pre-coating: A spray-type doctor blade coating is used to evenly spray the coating starch onto the reverse side of the paper, and then the doctor blade scrapes a coating of uniform thickness and basis weight onto the paper surface; the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 280℃. After drying to the process set dryness, it is further dried in a conditioning cylinder to correct paper warping issues.

[0171] The coated starch was manufactured by Jiangxi Yufan, and its model number was YF401 with a solid content of 50%.

[0172] The coating weight of the reverse pre-coating is 8 g / m². 2 ;

[0173] 4. First functional coating on the reverse side: A spray-type doctor blade coating is used to evenly spray the functional coating onto the paper surface, and then the doctor blade spreads the coating on the paper surface to create a coating with uniform thickness and basis weight. After coating, the coating is dried non-contactly by hot air drying, with the hot air drying temperature controlled at 280℃. After drying to the process set dryness, it is then cooled non-contactly by cold air cooling, with the cold air cooling temperature controlled at 28℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0174] The functional coating, an acrylic barrier coating, is manufactured by Sorely Chemicals, USA, and has a solid content of 51%.

[0175] The coating weight of the first functional coating on the reverse side is 6 g / m². 2 ;

[0176] 5. Second functional coating on the front side: A spray-type doctor blade coating is used to evenly spray the functional coating onto the paper surface, and then the doctor blade spreads a coating of uniform thickness and basis weight on the paper surface. After coating, the coating is dried by hot air drying in a non-contact manner, with the hot air drying temperature controlled at 220℃. After drying to the process set dryness, it is then cooled by non-contact cold air, with the cold air cooling temperature controlled at 28℃. Finally, the paper warping problem is calibrated by a conditioning cylinder.

[0177] The functional coating is an acrylic emulsion manufactured by BASF, model HPB4130, with a solid content of 40%.

[0178] The coating weight of the second functional coating on the front side is 6 g / m². 2 ;

[0179] The waterproof and oil-resistant coated cardboard for cold drink cups prepared in this embodiment has a moisture content of 7% and a density of 0.82 g / cm³. 3 Whiteness 80%, roughness ≤2.2, smoothness ≥20S, edge penetration ≤1.3kg / m 2 Surface absorption 180s (forward / reverse) ≤2 / 5g / m 2 Surface absorption ≤10g / m³ for 30 minutes 2 The ink absorbency (reverse) is 20-28%, the printing surface strength (reverse) is ≥1.6m / s, the folding endurance (transverse) is ≥55 times, and the bursting strength index is ≥2.1kPa·m. 2 / g, interlayer bonding ≥230J / m 2 Stiffness (horizontal / longitudinal) ≥2.3 / 4.5 mN·m, front oil resistance kit value 14, heat seal performance is that the heat seal surface should not separate when pulled apart.

[0180] Comparing the results of Example 8 with those of Examples 5-7, it can be seen that the coating liquid composition prepared in Example 4 can better improve the tightness, whiteness, smoothness, folding endurance, bursting index, interlayer bonding, stiffness, and front oil resistance kit value of waterproof and oil-resistant coated cardboard, and reduce roughness.

[0181] Compared with the coating liquid compositions prepared in Examples 1-3, the coating liquid composition prepared in Example 4 contains modified polyvinyl alcohol. The modified polyvinyl alcohol is prepared by linking polyacrylamide and polyamionic multi-claw hydrophobic functional segments to the polyvinyl alcohol molecular chain, forming a branched polyvinyl alcohol structure. The presence of polyacrylamide and polyamionic multi-claw hydrophobic functional segments ensures the water solubility of the modified polyvinyl alcohol while improving the crosslinking between the modified polyvinyl alcohol and kaolin, calcium carbonate, coating latex, coating starch, and waterproof and oil-resistant coatings. After the coating liquid dries, a denser coating can be formed, thereby improving the whiteness, smoothness, strength, and oil resistance of the coated cardboard.

[0182] The above description provides examples of the preferred embodiments of the present invention. Parts not detailed herein are common knowledge to those skilled in the art. The scope of protection of the present invention is determined by the claims. Any equivalent modifications based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. A coating liquid composition, characterized by comprising: By weight parts, including: 25 parts of porcelain clay, 40 parts of heavy calcium carbonate, 35 parts of light calcium carbonate, 15 parts of coating latex, 6 parts of coating starch, 20 parts of waterproof and oil-proof paint, 3 parts of micro-assistants, 2 parts of modified polyvinyl alcohol; The waterproof and oil-proof paint comprises an acrylate emulsion and a mineral, and the acrylate emulsion is 100 parts by weight, the mineral is 30 parts by weight, and the solid content is 45%; The micro-assistants comprise, by weight parts: 0.8 parts of a dispersing agent, 0.6 parts of CMC, 0.5 parts of a lubricant, 0.5 parts of a water-resistant agent, 0.5 parts of a dye, and 0.5 parts of a paint interfacial tension regulator; The preparation method of the modified polyvinyl alcohol comprises preparing an acrylic betaine monomer and a branching treatment; The acrylic betaine monomer is prepared by adding 6-7 g of acrylic-N,N-dimethylaminoethyl ester and 42-45 g of acetone into a reaction kettle, controlling the temperature of the reaction kettle to 40-50 DEG C, controlling the stirring speed to 100-300 rpm, stirring for 10-30 min, then adding 14-16 g of a 1,3-propane sulfonic acid lactone acetone solution dropwise while stirring, controlling the dropping speed to 2-2.5 g / min, continuing to stir for 10-11 h after the dropping is completed, naturally cooling to room temperature, filtering, washing the filter residue with 35-40 g of acetone for 3-4 times, and then drying at a temperature of 60-80 DEG C and a vacuum degree of 0.09-0.095 MPa to obtain the acrylic betaine monomer; The concentration of the 1,3-propane sulfonic acid lactone in the 1,3-propane sulfonic acid lactone acetone solution is 26-28 wt%; The branching treatment is performed by adding 5-5.5 g of polyvinyl alcohol 1788 and 250-260 g of deionized water into a reaction kettle, sealing the reaction kettle, replacing the kettle with nitrogen, then introducing nitrogen into the kettle to a pressure of 0.14-0.16 MPa, controlling the temperature of the reaction kettle to 40-50 DEG C, controlling the stirring speed to 100-300 rpm, stirring for 10-30 min, then adding 1-1.1 g of potassium persulfate, continuing to stir for 40-60 min, and adding 32-35 g of an acrylamide aqueous solution and 3.5-4 g of an acrylic betaine monomer aqueous solution dropwise, controlling the dropping speed of the acrylamide aqueous solution to 3-3.5 g / min and the dropping speed of the acrylic betaine monomer aqueous solution to 0.4-0.45 g / min, increasing the temperature of the reaction kettle to 50-60 DEG C and the stirring speed to 100-300 rpm after the addition of the acrylamide aqueous solution is completed, continuing to stir for 5-6 h, adding 0.9-1 g of sodium hydroxide, increasing the temperature of the reaction kettle to 110-120 DEG C, continuing to stir for 1-1.5 h, opening the reaction kettle, naturally cooling to room temperature, removing water by reduced pressure distillation, grinding to a particle size of 10-30 μm, and obtaining the modified polyvinyl alcohol; The concentration of the acrylamide in the acrylamide aqueous solution is 28-28 wt%; The concentration of the acrylic betaine monomer in the acrylic betaine monomer aqueous solution is 6-6.5 wt%.

2. The coating liquid composition according to claim 1, characterized by, The coating latex is a styrene-butadiene latex, the styrene-butadiene latex is a white emulsion, the solid content is 50%, the pH at 25℃ is 6.8, the viscosity at S62 / 60, 25℃ is 100, and the 325 mesh residue is less than or equal to 0.

05. The production manufacturer of the coating starch is Yurun Paper Co., Ltd. in Jiangxi, and the model is YF501.

3. The coating liquid composition according to claim 1, characterized by, The production manufacturer of the acrylate emulsion is BASF SE, the model is HPB4110, and the solid content is 40%; The mineral is kaolin, and the diameter-thickness ratio is greater than or equal to 25.

4. The coating liquid composition according to claim 1, characterized by The purchase manufacturer of the dispersant is Shandong Ausai Industrial Co., Ltd., the model is KCD-2188, the appearance is light yellow transparent liquid, the solid content is greater than or equal to 41%, the viscosity at 25℃ is 150-500mpa·s, the pH is 6.0-8.0, and the specific gravity is 1.0-1.

4. The purchase manufacturer of the lubricant is Shouguang Haiyun Trade Co., Ltd., the model is HY-2000, the solid content is greater than or equal to 25%, the viscosity is less than or equal to 50mpa·s, the pH is 8.0-10.5, and the specific gravity is 1.00-1.

05. The purchase manufacturer of the water-resistant agent is Jining Mingsheng New Material Co., Ltd., the model is DS-KS618A, the solid content is 48±2%, the viscosity at 25℃, S61 / 100 is less than or equal to 50mPa·s, the pH is 6.0-9.0, and the specific gravity is 1.15-1.

20.

5. Use of the coating liquid composition according to any one of claims 1 to 4 in a water- and oil-repellent coated paper, characterized in that, It comprises: Front pre-coating, front first functional coating, back pre-coating, and back first functional coating.

6. Use of the coating liquid composition according to claim 5 in a water- and oil- repellent coated paper, characterized in that, The front pre-coating is uniformly sprayed onto the front of the base paper by using a spraying blade coater, and then the coating layer with uniform thickness and basis weight is scraped on the paper surface by using a blade. After coating, the coating layer is dried by hot air drying for non-contact drying, the temperature of the hot air drying is controlled at 280℃, and after drying to the process setting dryness, the calendering cylinder is used for further drying and correcting the paper curling problem. The base paper has a grammage of 200 g / m 2 ; The coating weight of the front pre-coating is 8 g / m 2 ; The front first functional coating is uniformly coated on the front of the base paper by using curtain coating, and then the coating layer is dried by hot air drying for non-contact drying, the temperature of the hot air drying is controlled at 280℃, and after drying to the process setting dryness, the non-contact cold air cooling is used for cooling, the temperature of the cold air cooling is controlled at 28℃, and finally the calendering cylinder is used for correcting the paper curling problem. The functional coating acrylic barrier coating is produced by Soterial, and the solid content is 51%. The coating weight of the front side first functional coating is 8 g / m 2 ; The back pre-coating is uniformly sprayed onto the back of the coated paper by using a spraying blade coater, and then the coating layer with uniform thickness and basis weight is scraped on the paper surface by using a blade. The production manufacturer of the coating starch is Yurun Paper Co., Ltd. in Jiangxi, and the model is YF401, and the solid content is 50%. The reverse pre-coated coating weight is 8 g / m 2 ; The back first functional coating is uniformly sprayed onto the paper surface by using a spraying blade coater, and then the coating layer with uniform thickness and basis weight is scraped on the paper surface by using a blade. After coating, the coating is dried by hot air drying for non-contact drying, the temperature of the hot air drying is controlled at 280 DEG C, after drying to the process setting dryness, the coating is cooled by non-contact cold air cooling, the temperature of the cold air cooling is controlled at 28 DEG C, and then the coating is calibrated by a conditioning cylinder to solve the paper page warping problem; The functional coating acrylic barrier coating is produced by Solids, the solid content is 51%, and the functional coating is acrylate emulsion produced by BASF, the model number is HPB4130, and the solid content is 40%; The reverse side first functional coating is applied at a coating weight of 6 g / m 2 .

7. Use of the coating liquid composition according to claim 5 in a water- and oil-repellent coated paper, characterized in that, The application of the coating liquid composition in waterproof and oil-proof coated paper also includes front-side second-time functional coating.

8. Use of the coating liquid composition according to claim 7 in a water- and oil- repellent coated paper, characterized in that, The front-side second-time functional coating is coated by using a spraying blade coating, the functional coating is uniformly sprayed on the paper surface, and then the coating is scraped on the paper surface by a blade to form a coating with uniform thickness and basis weight, after coating, the coating is dried by hot air drying for non-contact drying, the temperature of the hot air drying is controlled at 220 DEG C, after drying to the process setting dryness, the coating is cooled by non-contact cold air cooling, the temperature of the cold air cooling is controlled at 28 DEG C, and then the coating is calibrated by a conditioning cylinder to solve the paper page warping problem; The functional coating is acrylate emulsion produced by BASF, the model number is HPB4130, and the solid content is 40%. The coating weight of the front second functional coating is 6g / m 2 .