Water-based high-wear-resistance and high-temperature-resistance preprinting gloss oil and preparation method thereof

Abstract

The gloss oil comprises the following components in percentage by mass: 18-30% of a water-based carboxyl-containing self-crosslinking film-forming temperature-resistant acrylic emulsion, 45-65% of a water-based carboxyl-containing high-acid-value temperature-resistant hard acrylic emulsion, 6-12% of a water-based high-density polyethylene wax micro-dispersion, 5-10% of a water-based high-wear-resistance and high-temperature-resistance pre-printing varnish, 5-10% of a water-based high-wear-resistance and high-temperature-resistance pre-printing varnish, 5-10% of a water-based high-wear-resistance and high-temperature-resistance pre-printing The water-based paint is prepared from the following components in percentage by weight: 0.5 to 3 percent of water-based micro-dispersion of high-molecular organic silicon polymer, 0.2 to 1.0 percent of wetting leveling agent, 0.01 to 0.3 percent of defoaming agent, 3 to 10 percent of deionized water, 4 to 8 percent of water-based polycarbodiimide, 0.1 to 0.3 percent of ammonia water and 0.01 to 0.2 percent of preservative, wherein the sum of the components is 100 percent. The carboxyl-containing self-crosslinking acrylic emulsion is selected,-COOH of the acrylic emulsion and-N = C = N-of polycarbodiimide are subjected to a crosslinking reaction in the drying process, and the gloss oil is blended with other raw materials, so that the performance of the gloss oil is improved. The gloss oil disclosed by the invention is good in stability, long in storage period, strong in printing adaptability, and good in wear resistance and temperature resistance. The product preparation method is simple in process, and the operation method is easy to control.

Description

Technical Field

[0001] The invention relates to the technical field of water-based varnish, and in particular to a water-based high-wear-resistant and high-temperature-resistant pre-printing varnish and a preparation method thereof. Background Art

[0002] As the whole society's awareness of environmental protection increases, people pay more and more attention to the impact of ecological environment changes in daily activities such as production operations and life consumption. In the field of printing, people are also paying more and more attention to the importance of environmental protection in production. Traditional varnishes are mostly solvent-based varnishes, which contain a large amount of volatile organic compounds (VOCs). Volatile organic compounds (VOCs) are emitted into the air, causing environmental pollution. Due to the large amount of volatile organic compounds (VOCs) emitted, the air quality of the printing workshop is affected, the health of workers is endangered, and it is easy to cause safety hazards. In order to solve the problem of volatile organic compounds (VOCs) emissions, the demand for water-based varnish continues to rise.

[0003] The drying process of traditional single-component water-based varnish is mainly achieved through the evaporation of water. After the water-based varnish is printed and varnished on the product, the water will gradually evaporate, thus completing the drying process and forming a protective layer on the surface of the printed product. This protective layer has poor wear resistance and temperature resistance. This drying method is greatly affected by ambient temperature and humidity. If the ambient temperature is low or the air humidity in the workshop is high, the drying time of the water-based varnish will be extended, the production efficiency will be reduced, the surface effect of the packaging and printed products will also be affected, and the wear resistance and temperature resistance of the packaging and printed products will also be affected. Products with pre-printed water-based varnish are prone to problems such as dragging when passing through the production cardboard line, which makes it easy for product quality problems to occur in the subsequent process. If these influencing factors are to be solved when the ambient temperature is low or the air humidity in the workshop is high, not only measures such as increasing the drying temperature of the equipment and strengthening the working condition strength of the humidity control system are required, which greatly increases energy consumption and also increases production costs.

[0004] Some two-component water-based varnishes are divided into two components. Adding a curing agent such as aziridine before use can also partially solve the wear resistance problem of water-based varnishes. However, the validity period of this two-component water-based varnish is short. During use, the curing agent aziridine will gradually decompose and become ineffective in the water-based varnish in a short period of time. The content of aziridine in the water-based varnish cannot be accurately controlled, especially in summer when the temperature is high. It is difficult to accurately control the amount of aziridine added during production and use, which seriously affects the quality control and production control of the water-based varnish.

[0005] Some two-component water-based varnishes are divided into two components. Before use, the water-based isocyanate curing agent is added to the water-based varnish and mixed evenly before use, which can also partially solve the wear and temperature resistance problems. However, the validity period of this two-component water-based varnish is very short, and the stability of the water-based isocyanate curing agent in the water-based system is poor. The viscosity will gradually increase during use, seriously affecting the quality stability of the water-based varnish. Especially in the summer when the temperature is high, it is easy to cause the cross-linking reaction to be too fast and the viscosity of the water-based varnish to increase rapidly, which seriously affects its printing adaptability, and even the viscosity is too high to be used, thus affecting the overall quality of the packaging product and production arrangements. Summary of the invention

[0006] The purpose of the present invention is to provide a water-based high-wear-resistant and high-temperature-resistant pre-printing varnish.

[0007] Another object of the present invention is to provide a method for preparing a water-based highly wear-resistant and high-temperature-resistant pre-printing varnish.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme:

[0009] A water-based high-wear-resistant and high-temperature-resistant pre-printing varnish, comprising the following components by mass percentage:

[0010] 18-30% of water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl, 45-65% of water-based high-acid value heat-resistant hard acrylic emulsion containing carboxyl, 6-12% of water-based high-density polyethylene wax microdispersion, 0.5-3% of water-based microdispersion of high molecular weight silicone polymer, 0.2-1.0% of water-based wetting and leveling agent, 0.01-0.3% of water-based defoaming agent, 3-10% of deionized water, 4-8% of water-based polycarbodiimide, 0.1-0.3% of ammonia water, and 0.01-0.2% of preservative. The sum of the above components is 100%.

[0011] Preferably, the acid value of the water-based carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion is 40 to 60 mgKOH / g, T g The temperature is -30~7℃, the minimum film-forming temperature is>0℃, the solid content is 40~48%, the viscosity is 500~3000mPa.s, and the molecular weight is>200000.

[0012] Preferably, the acid value of the water-based carboxyl-containing high acid value heat-resistant hard acrylic emulsion is 55 to 90 mgKOH / g, T g The temperature is 98-120℃, the minimum film-forming temperature is >90℃, the solid content is 38-45%, the viscosity is 500-3000mPa.s, and the molecular weight is >200000.

[0013] Preferably, the aqueous high-density polyethylene wax microdispersion has a solid content of 40-60%, a softening point of 110-140° C., and non-ionic ionicity.

[0014] Preferably, the active solid content of the aqueous micro-dispersion of the high molecular weight organosilicon polymer is 50-85%, the ionicity is non-ionic, and the dispersion medium used is water.

[0015] Preferably, the active content of the water-based wetting and leveling agent is 60-98%, and the ionicity is non-ionic.

[0016] Preferably, the non-volatile matter of the aqueous defoamer is 20-98%, the chemical composition is a polyether siloxane copolymer emulsion containing fumed silica, and the dispersion medium used is water.

[0017] Preferably, the effective component content of the water-based polycarbodiimide is 35-45%, and the dispersion medium used is water, which does not contain volatile organic compounds.

[0018] Preferably, the concentration of the ammonia water is 20%.

[0019] Preferably, the concentration of the preservative is 10%, and the chemical composition is 1,2-benzisothiazolyl-3(2H)-one.

[0020] Another object of the present invention is to provide a method for preparing an aqueous preprint varnish, comprising the following steps:

[0021] First, slowly add the water-based defoamer into the water in the formula while stirring in proportion, and fully disperse and mix them for use. Then, in the dispersion stirring kettle, add the water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl in proportion, start stirring, adjust the stirring speed to 300-800 rpm, and then slowly add the water-based high acid value heat-resistant hard acrylic emulsion containing carboxyl, water-based high-density polyethylene wax microdispersion, water-based microdispersion of high molecular weight organic silicon polymer, water-based wetting and leveling agent, a mixture of water and water-based defoamer that is pre-dispersed and mixed, water-based polycarbodiimide, ammonia water, and preservatives. After the materials are added, adjust the stirring speed to 600-1000 rpm, stir for 30 minutes, and fully disperse and mix them to obtain a water-based high-wear-resistant and high-temperature-resistant pre-printing varnish.

[0022] Furthermore, the method for preparing a water-based high-wear-resistant and high-temperature-resistant pre-printed varnish also includes: sampling and testing pH value, viscosity, solid content, wear resistance test, high temperature resistance test, anti-wet adhesion test and other tests, and filtering and packaging after passing the test.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The water-based high-wear-resistant and high-temperature-resistant pre-printing varnish of the present invention uses water as a solvent and uses a water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing a carboxyl group. A self-crosslinking reaction occurs during the drying process of the water-based varnish, which can effectively improve the film-forming property, heat resistance and water resistance of the water-based pre-printing varnish coating. The -N=C=N-functional group in the water-based polycarbodiimide and the water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing a carboxyl group and the carboxyl group in the water-based high-temperature-resistant hard acrylic emulsion containing a carboxyl group undergo a crosslinking reaction during the drying process to further form a three-dimensional network structure, which can further significantly improve the wear resistance, heat resistance and other properties of the water-based pre-printing varnish coating. In addition, the water-based polycarbodiimide is insensitive to moisture, has good storage stability, and is safe and convenient during the production operation. At the same time, a water-based high-melting-point high-density polyethylene wax microdispersion and a water-based microdispersion of a high-molecular organic silicon polymer are added to further improve the comprehensive properties of the water-based pre-printing varnish, such as the wear resistance and heat resistance.

[0025] The water-based highly wear-resistant and heat-resistant pre-printed varnish of the present invention uses water as a solvent, is safe and environmentally friendly, can greatly reduce the emission of volatile organic compounds, and solve the environmental pollution problem of the emission of organic compounds of traditional pre-printed varnishes; it basically does not contain volatile organic compounds, is not flammable and explosive, and greatly reduces the safety production risk during use; it has high wear resistance, high temperature resistance, and good anti-adhesion effect, which can greatly improve the problem of dragging when the pre-printed products pass through the production cardboard line; at the same time, it solves the quality stability problem of water-based pre-printed varnish during production, transportation, storage and use. Pre-dispersing and mixing the water and water-based defoamer in the formula evenly can effectively prevent the material compatibility problems that occur during the production process, and prevent the product from having defects such as shrinkage holes and poor leveling; this product has a fast drying speed and stable water-based varnish raw materials; during use by customers, the production operation process is simple, and only water is needed to adjust the viscosity during use, which greatly saves production costs. The product preparation method has a simple process, the operation method is easy to control, the quality consistency is very good during mass production, the produced water-based pre-printing varnish has excellent printing adaptability, and the products produced using this water-based pre-printing varnish have stable quality and excellent comprehensive performance.

[0026] The invention uses a carboxyl-containing aqueous self-crosslinking film-forming heat-resistant acrylic emulsion and a carboxyl-containing high-acid value aqueous high-temperature-resistant hard copolymer acrylic emulsion to mix with aqueous polycarbodiimide, and mixes with other raw materials such as an aqueous high-melting-point high-density polyethylene wax microdispersion and an aqueous microdispersion of a high-molecular organic silicon polymer to prepare an aqueous high-wear-resistant and high-temperature-resistant pre-printing varnish. The product has comprehensive properties such as high wear resistance and high temperature resistance, has excellent printing adaptability, and is suitable for aqueous flexographic and gravure printing. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with specific embodiments.

[0028] The invention provides a water-based high-wear-resistant and high-temperature-resistant pre-print varnish. The water-based high-wear-resistant and high-temperature-resistant pre-print varnish has low volatile organic compounds (VOCs), is safe and environmentally friendly, has good product stability, a long storage period, a fast product drying speed, and strong printing adaptability. The self-crosslinking of the water-based self-crosslinking resin and the crosslinking reaction of the high-acid value water-based resin containing a carboxyl group and the water-based polycarbodiimide crosslinking agent with good stability in the water-based system during the drying process during printing use form a three-dimensional network structure, which has the advantages of improving the wear resistance and temperature resistance of the water-based pre-print varnish, and at the same time, it is compatible with other materials. The material phase is formulated, and it has the characteristics of high wear resistance and high temperature resistance, etc., which solves the practical problems such as dragging of products after pre-printing water-based pre-printed varnish when passing through the production cardboard line; at the same time, it solves the quality stability problem of water-based pre-printed varnish during production, transportation, storage and use; at the same time, another purpose of the present invention is to provide a preparation method of water-based pre-printed varnish, the preparation method is simple to operate and easy to control, and the produced water-based pre-printed varnish product does not add volatile organic compounds (VOCs) during the production process, has good product stability, long product storage period, strong printing adaptability, and the product is suitable for flexographic and gravure printing.

[0029] In one embodiment of the present invention, a water-based high-wear-resistant and high-temperature-resistant preprint varnish comprises the following components by mass percentage:

[0030] 18-30% of water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl, 45-65% of water-based high-acid value heat-resistant hard acrylic emulsion containing carboxyl, 6-12% of water-based high-density polyethylene wax microdispersion, 0.5-3% of water-based microdispersion of high molecular weight silicone polymer, 0.2-1.0% of water-based wetting and leveling agent, 0.01-0.3% of water-based defoaming agent, 3-10% of deionized water, 4-8% of water-based polycarbodiimide, 0.1-0.3% of ammonia water, and 0.01-0.2% of preservative. The sum of the above components is 100%.

[0031] Preferably, the water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl groups is preferably, but not limited to, Haw Poly 8052 of Zhongshan Huamingtai Technology Co., Ltd. The acid value of the water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl groups is 50 mgKOH / g, Tg is -25°C, the minimum film-forming temperature is >0°C, the solid content is 48±2%, the viscosity is 1800-2500 mPa.s, and the molecular weight is >200000. The water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl groups has good adhesion to the substrate and excellent film-forming properties, self-crosslinking reaction occurs during the drying process, and contains carboxyl groups, which can react with water-based polycarbodiimide during the printing and drying process, which helps to improve the film-forming properties and water resistance of water-based pre-printed varnish, high temperature resistance, and improve the adhesion and anti-slip angle of the product, has good compatibility with ethanol, and excellent printing adaptability.

[0032] Preferably, the water-based carboxyl-containing high acid value heat-resistant hard acrylic emulsion is preferably, but not limited to, Haw Poly 8190 of Zhongshan Huamingtai Technology Co., Ltd. The water-based carboxyl-containing high acid value heat-resistant hard acrylic emulsion has an acid value of 76 mgKOH / g, a Tg of 110°C, a minimum film-forming temperature>90°C, a solid content of 40±2%, a viscosity of 800-2500 mPa.s, and a molecular weight>200000. The water-based carboxyl-containing high acid value heat-resistant hard acrylic emulsion has a fast drying speed and a high carboxyl content. It has good reactivity with water-based polycarbodiimide during the printing and drying process, helps to improve the wear resistance and high temperature resistance of water-based pre-printed varnish, improves the anti-rebound property of the product, has good compatibility with ethanol, and has excellent printing adaptability.

[0033] Preferably, the aqueous high-density polyethylene wax microdispersion is preferably but not limited to Foshan Wengkaier Trading Co., Ltd. GA2000. The water-based high-density polyethylene wax microdispersion has a solid content of 50±1%, a softening point of 127°C, and non-ionic ionicity. The water-based high-density polyethylene wax microdispersion helps to improve the wear resistance of water-based pre-printing varnish, and improves the scratch resistance and smoothness of the product.

[0034] Preferably, the aqueous microdispersion of the high molecular weight silicone polymer is preferably, but not limited to, SILCO CT 5052 of Foshan Wengkaier Trading Co., Ltd. The aqueous microdispersion of the high molecular weight silicone polymer has an active solid content of 65%, is nonionic, and the dispersion medium used is water. The aqueous microdispersion of the high molecular weight silicone polymer helps to improve the wear resistance and scratch resistance of the water-based pre-printed varnish, improve the smoothness and anti-adhesion properties of the product, and improve the water resistance of the product.

[0035] Preferably, the water-based wetting and leveling agent is preferably, but not limited to, SILCO CT3137 of Foshan Wengkaier Trading Co., Ltd. The active content of the water-based wetting and leveling agent is 98%, and the ionicity is non-ionic. The water-based wetting and leveling agent helps to improve the surface wetting performance of the varnish, improve the leveling property of the varnish, and help the water-based pre-printed varnish to form a uniform and smooth coating on the surface of the substrate when in use.

[0036] Preferably, the aqueous defoamer is preferably, but not limited to, Evonik Degussa defoamer emulsion TEGO Foamex805N. The non-volatile matter of the aqueous defoamer is 24%, the chemical composition is a polyether siloxane copolymer emulsion containing fumed silica, and the dispersion medium used is water. The aqueous defoamer helps to eliminate and inhibit bubbles in the aqueous pre-printed varnish, improve the stability of the aqueous pre-printed varnish, has good compatibility with other materials, and stabilizes the printing adaptability of the product.

[0037] Preferably, the water-based polycarbodiimide is preferably, but not limited to, Shanghai CARBODILITE C-218. The water-based polycarbodiimide has an effective ingredient content of 40%, and the dispersion medium used is water, which does not contain volatile organic compounds. The carboxyl groups of the water-based polycarbodiimide, the water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl groups, and the high-acid value water-based high-temperature-resistant hard copolymer acrylic emulsion containing carboxyl groups undergo a crosslinking reaction when the water evaporates and dries to form a film during the use of the water-based pre-printing varnish, forming a three-dimensional network structure, which helps to improve the wear resistance and temperature resistance of the product, and at the same time improves the adhesion and ethanol resistance of the product.

[0038] Preferably, the ammonia water is preferably, but not limited to, 20% ammonia water. The ammonia water with a concentration of 20% is used to adjust the pH value of the water-based pre-printing varnish to 8.0-9.0, further improving the stability of the product.

[0039] Preferably, the preservative is preferably, but not limited to, BIT-10 with a concentration of 10% produced by Sanbo Biotechnology (Shanghai) Co., Ltd. The concentration of the preservative is 10%, and the chemical composition is 1,2-benzisothiazolyl-3(2H)-one. It complies with the relevant product standards of the national food packaging industry, prevents the water-based varnish from mold and deterioration, ensures stable product quality, and extends the shelf life.

[0040] The present invention uses the above-mentioned water-based carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion and the high-acid value water-based carboxyl-containing high-temperature-resistant hard copolymer acrylic emulsion to mix with water-based polycarbodiimide, and mixes with other raw materials to prepare the water-based pre-printing varnish, which has excellent comprehensive properties such as high wear resistance and high temperature resistance, and has good printing adaptability, and is suitable for water-based flexographic and gravure printing.

[0041] In one embodiment of the present invention, a method for preparing a water-based pre-printing varnish comprises the following steps:

[0042] First, slowly add the water-based defoamer into the water in the formula while stirring in proportion, and fully disperse and mix them for use. Then, in the dispersion stirring kettle, add the water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl in proportion, start stirring, adjust the stirring speed to 300-800 rpm, and then slowly add the water-based high acid value heat-resistant hard acrylic emulsion containing carboxyl, water-based high-density polyethylene wax microdispersion, water-based microdispersion of high molecular weight organic silicon polymer, water-based wetting and leveling agent, a mixture of water and water-based defoamer that is pre-dispersed and mixed, water-based polycarbodiimide, ammonia water, and preservatives. After the materials are added, adjust the stirring speed to 600-1000 rpm, stir for 30 minutes, and fully disperse and mix them to obtain a water-based high-wear-resistant and high-temperature-resistant pre-printing varnish.

[0043] Furthermore, the method for preparing a water-based high-wear-resistant and high-temperature-resistant pre-printed varnish also includes: sampling and testing pH value, viscosity, solid content, wear resistance test, high temperature resistance test, anti-wet adhesion test and other tests, and filtering and packaging after passing the test.

[0044] The raw material models used in the following examples and comparative examples are as follows:

[0045] The water-based carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion was HawPoly 8052 from Zhongshan Huamingtai Technology Co., Ltd.;

[0046] The water-based carboxyl-containing high-temperature resistant rigid copolymer acrylic emulsion acid is HawPoly 8190 produced by Zhongshan Huamingtai Technology Co., Ltd.;

[0047] Waterborne high-density polyethylene wax microdispersion is Foshan Wengkaier Trading Co., Ltd. GA2000;

[0048] The aqueous microdispersion of high molecular weight silicone polymer was SILCO CT5052 from Foshan Wengkaier Trading Co., Ltd.;

[0049] The water-based wetting and leveling agent was SILCO CT 3137 produced by Foshan Wengkaier Trading Co., Ltd.;

[0050] The water-based defoamer is Evonik Degussa defoamer emulsion TEGO Foamex 805N;

[0051] The water-based polycarbodiimide is CARBODILITE C-218 produced by Shanghai Kelisi.

[0052] The ammonia water is a 20% ammonia water;

[0053] The preservative was 10% BIT-10 from Sanbo Biotechnology (Shanghai) Co., Ltd.;

[0054] Example 1

[0055] A water-based high-wear-resistant and high-temperature-resistant pre-printing varnish, comprising the following components by mass percentage:

[0056] Water-based carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion Haw Poly 8052 21%, water-based carboxyl-containing high acid value heat-resistant hard acrylic emulsion Haw Poly 8190 57%, water-based high-density polyethylene wax microdispersion GA2000 9%, aqueous microdispersion of high molecular weight silicone polymer SILCO CT 5052 1.5%, aqueous wetting and leveling agent SILCO CT 3137 0.5%, aqueous defoamer TEGO Foamex 805N 0.08%, deionized water 4.8%, aqueous polycarbodiimide CARBODILITE C-218 6%, ammonia water 0.1%, preservative 10% BIT-10 0.02%, the sum of the above components is 100%.

[0057] The preparation method of the above-mentioned water-based high-wear-resistant and high-temperature-resistant pre-printing varnish comprises the following steps:

[0058] First, slowly add the water-based defoamer into the water in the formula while stirring in proportion, and fully disperse and mix them for use. Then, in the dispersion stirring kettle, add the water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl in proportion, start stirring, adjust the stirring speed to 300-800 rpm, and then slowly add the water-based high acid value heat-resistant hard acrylic emulsion containing carboxyl, water-based high-density polyethylene wax microdispersion, water-based microdispersion of high molecular weight organic silicon polymer, water-based wetting and leveling agent, a mixture of water and water-based defoamer that is pre-dispersed and mixed, water-based polycarbodiimide, ammonia water, and preservatives. After the materials are added, adjust the stirring speed to 600-1000 rpm, stir for 30 minutes, and fully disperse and mix them to obtain a water-based high-wear-resistant and high-temperature-resistant pre-printing varnish.

[0059] Example 2

[0060] A water-based high-wear-resistant and high-temperature-resistant pre-printing varnish, comprising the following components by mass percentage:

[0061] Water-based carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion Haw Poly 8052 20%, water-based carboxyl-containing high acid value heat-resistant hard acrylic emulsion Haw Poly 8190 58%, water-based high-density polyethylene wax microdispersion GA2000 9%, aqueous microdispersion of high molecular weight silicone polymer SILCO CT 5052 1.5%, aqueous wetting and leveling agent SILCO CT 3137 0.5%, aqueous defoamer TEGO Foamex 805N 0.08%, deionized water 5.8%, aqueous polycarbodiimide CARBODILITE C-218 5%, ammonia water 0.1%, preservative 10% BIT-10 0.02%, the sum of the above components is 100%.

[0062] The preparation method is the same as that in Example 1 and will not be described again here.

[0063] Example 3

[0064] A water-based high-wear-resistant and high-temperature-resistant pre-printing varnish, comprising the following components by mass percentage:

[0065] Water-based carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion Haw Poly 8052 26%, water-based carboxyl-containing high acid value heat-resistant hard acrylic emulsion Haw Poly 8190 51%, water-based high-density polyethylene wax microdispersion GA2000 9%, aqueous microdispersion of high molecular weight silicone polymer SILCO CT 5052 1.5%, aqueous wetting and leveling agent SILCO CT 3137 0.5%, aqueous defoamer TEGO Foamex 805N 0.08%, deionized water 4.8%, aqueous polycarbodiimide CARBODILITE C-218 7%, ammonia water 0.1%, preservative 10% BIT-10 0.02%, the sum of the above components is 100%.

[0066] The preparation method is the same as that in Example 1 and will not be described again here.

[0067] Comparative Example 1

[0068] The difference between this comparative example and Example 1 is that: in this comparative example, 21% by weight of the aqueous carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion Haw Poly 8052 is not added, and deionized water is used instead.

[0069] Comparative Example 2

[0070] The difference between this comparative example and Example 2 is that: in this comparative example, 57% by weight of the aqueous carboxyl-containing high acid value temperature-resistant hard acrylic emulsion Haw Poly 8190 is not added, and deionized water is used instead.

[0071] Comparative Example 3

[0072] The difference between this comparative example and Example 3 is that this comparative example does not add 9% by mass of aqueous high-density polyethylene wax microdispersion GA2000, replaced with deionized water.

[0073] Comparative Example 4

[0074] The difference between this comparative example and Example 4 is that this comparative example does not add 1.5% by weight of the aqueous microdispersion of high molecular weight organic silicon polymer SILCO CT 5052, but uses deionized water instead.

[0075] Comparative Example 5

[0076] The difference between this comparative example and Example 5 is that this comparative example does not add 6% by mass of water-based polycarbodiimide CARBODILITE C-218, but uses deionized water instead.

[0077] The contents (parts by mass) of each component of one embodiment and five comparative examples are shown in Table 1 below:

[0078] Table 1:

[0079]

[0080] The pH value, viscosity and solid content of the above samples were tested as follows:

[0081] pH: According to GB / T 8325-1987 standard, tested with Leici PHS-3E;

[0082] Viscosity: According to GB / T 13217.4-2020 standard, tested with Tu-4 cup;

[0083] Solid content: According to GB / T 2793-1995 standard;

[0084] The water-based pre-printing varnish of the above embodiment and comparative example was used to prepare samples, and the sample preparation method was as follows:

[0085] The paper material used is light coated paper; the hand-spreading wheel uses a 300-line anilox roller color spreading wheel; the base ink uses a water-based pre-printed ink, Budweiser red; use a hand-spreading wheel to apply water-based pre-printed varnish on the light coated paper with the Budweiser red base ink pre-spread, leave it at room temperature for 2 minutes, then blow dry it in an oven at 60±1℃ for 2 minutes, take it out and cool it down before performing performance testing.

[0086] The above-prepared samples were subjected to abrasion resistance test, high temperature resistance test, and wet adhesion resistance test. The test methods are as follows:

[0087] Wear resistance: According to GB / T 7706-2008 standard test method, tested with HD-A508 from Haida International;

[0088] Abrasion test: Use HD-A508 printing ink decolorization abrasion tester of Haida International with a pressure of 4 pounds. Cut the sample into 220mm (length) * 60mm (width) and fix it on the abrasion tester. Fix the white paper cut by a standard cutter (white paper is 80g A4 paper with a length and width of 220mm*50mm) on the friction slider; add weights, the pressure is 4 pounds, set the number of frictions, and observe the scratches and discoloration on the surface of 80g A4 paper and the scratches and discoloration on the surface of the sample after the test. The lighter the scratches and discoloration, the better the wear resistance of the water-based pre-printed varnish; the more frictions, the cleaner and more wear-resistant the surface.

[0089] High temperature resistance: tested with HST-H3 heat sealer;

[0090] High temperature resistance test: The heat seal tester uses the hot pressing method to determine the temperature parameters of the water-based varnish sample with a piece of white 80gA4 paper placed on the varnish surface at a certain heat sealing time, heat sealing pressure and heat sealing temperature. Set the heat sealing time and heat sealing pressure. When the upper and lower heat sealing knives reach the set temperature, select manual or automatic mode for heat sealing test according to the test requirements. Set the heat sealing time to 1 second and the heat sealing pressure to 0.4mPa, gradually increase the temperature of the upper and lower heat sealing knives, observe the scratches and discoloration on the surface of the sample, and increase the temperature in a gradient of 1°C until the surface of the sample is scratched or discolored, which is determined as the highest temperature resistance. During this test, the set temperatures of the upper and lower heat sealing knives are the same. The higher the temperature, the better the temperature resistance.

[0091] Anti-wet adhesion: Referring to GB / T 13217.8-2009 standard, cut the exhibit sample into 20mm*20mm small squares, with the varnish surface facing the varnish surface, drop 1ml of water between the two varnish surfaces with a dropper, put it between 2 pieces of 20mm*20mm*2mm glass pieces, press a 2000g weight on the glass piece on the test sample, place it in an oven at 50±1℃ for 2h, and observe the test results. No adhesion means good anti-adhesion effect.

[0092] The test results are shown in Table 2:

[0093] Table 2:

[0094]

[0095]

[0096] According to the above test results, by comparing Comparative Example 1 with Example 1, it can be seen that the present invention can effectively improve the film-forming property of the aqueous pre-printed varnish by adding an aqueous carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion component to the aqueous pre-printed varnish system and matching it with other raw materials, and improve the film surface strength of the varnish after drying, thereby effectively improving the wear resistance and temperature resistance of the aqueous pre-printed varnish; by comparing Comparative Example 2 with Example 1, it can be seen that by adding an aqueous carboxyl-containing high acid value heat-resistant hard acrylic emulsion component to the aqueous pre-printed varnish system and matching it with other raw materials, By combining with other raw materials, the wear resistance and temperature resistance of the water-based pre-printed varnish can be improved; by comparing comparative example 3 with example 1, it can be seen that by adding a water-based high-density polyethylene wax micro-dispersion component to the water-based pre-printed varnish system and combining with other raw materials, it is helpful to improve the wear resistance and temperature resistance of the water-based pre-printed varnish; by comparing comparative example 4 with example 1, it can be seen that by adding a water-based micro-dispersion of a high molecular weight organic silicon polymer and combining with other raw materials, it is helpful to improve the high temperature resistance, wear resistance and water resistance of the water-based pre-printed varnish. By comparing comparative example 5 with example 1, it can be seen that by adding water-based polycarbodiimide and combining with other raw materials, the high temperature resistance and wear resistance of the water-based pre-printed varnish are further improved.

[0097] The invention uses a carboxyl-containing aqueous self-crosslinking film-forming heat-resistant acrylic emulsion and a carboxyl-containing high-acid value aqueous heat-resistant hard acrylic emulsion to mix with aqueous polycarbodiimide, and mixes with other raw materials such as an aqueous high-melting-point high-density polyethylene wax microdispersion and an aqueous microdispersion of a high-molecular organic silicon polymer to prepare an aqueous high-wear-resistant and high-temperature-resistant pre-printing varnish. The product has excellent comprehensive properties such as high wear resistance and high temperature resistance, has excellent printing adaptability, and is suitable for aqueous flexographic and gravure printing.

[0098] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A water-based high wear-resistant and high temperature-resistant pre-printing varnish, comprising the following components by mass percentage: 18-30% of water-based self-crosslinking film-forming heat-resistant acrylic emulsion containing carboxyl, 45-65% of water-based high-acid value heat-resistant hard acrylic emulsion containing carboxyl, 6-12% of water-based high-density polyethylene wax microdispersion, 0.5-3% of water-based microdispersion of high molecular weight silicone polymer, 0.2-1.0% of water-based wetting and leveling agent, 0.01-0.3% of water-based defoaming agent, 3-10% of deionized water, 4-8% of water-based polycarbodiimide, 0.1-0.3% of ammonia water, and 0.01-0.2% of preservative. The sum of the above components is 100%.

2. The water-based high wear-resistant and high temperature-resistant preprint varnish according to claim 1, characterized in that: The acid value of the water-based carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion is 40 to 60 mgKOH / g, T g The temperature is -30~7℃, the minimum film-forming temperature is>0℃, the solid content is 40~48%, the viscosity is 500~3000mPa.s, and the molecular weight is>200000.

3. The water-based high wear-resistant and high temperature-resistant preprint varnish according to claim 1, characterized in that: The acid value of the water-based carboxyl-containing high acid value heat-resistant hard acrylic emulsion is 55 to 90 mgKOH / g, T g The temperature is 98-120℃, the minimum film-forming temperature is >90℃, the solid content is 38-45%, the viscosity is 500-3000mPa.s, and the molecular weight is >200000.

4. The water-based high wear-resistant and high temperature-resistant preprint varnish according to claim 1, characterized in that: The aqueous high-density polyethylene wax microdispersion has a solid content of 40-60%, a softening point of 110-140° C., and non-ionic ionicity.

5. The water-based high wear-resistant and high temperature-resistant preprint varnish according to claim 1, characterized in that: The aqueous micro-dispersion of the macromolecular organic silicon polymer has an active solid content of 50-85%, is non-ionic, and the dispersion medium used is water.

6. The water-based high wear-resistant and high temperature-resistant preprint varnish according to claim 1, characterized in that: The active content of the water-based wetting and leveling agent is 60-98%, and the ionicity is non-ionic; the non-volatile matter of the water-based defoaming agent is 20-98%, and the chemical composition is polyether siloxane copolymer emulsion containing gas phase silicon dioxide, and the used dispersion medium is water.

7. The water-based high wear-resistant and high temperature-resistant preprint varnish according to claim 1, characterized in that: The effective component content of the water-based polycarbodiimide is 35-45%, and the used dispersion medium is water, which does not contain volatile organic compounds.

8. The water-based high wear-resistant and high temperature-resistant preprint varnish according to claim 1, characterized in that: The concentration of the ammonia water is 20%; the concentration of the preservative is 10%, and the chemical component is 1,2-benzisothiazolyl-3(2H)-one.

9. A method for preparing the water-based high-wear-resistant and high-temperature-resistant preprint varnish according to any one of claims 1 to 8, characterized in that: The following steps are involved: First, the aqueous defoamer is slowly added into the water in the formula while being stirred in proportion, and the mixture is fully dispersed and mixed for use; then, in a dispersion stirring kettle, an aqueous carboxyl-containing self-crosslinking film-forming heat-resistant acrylic emulsion is added in proportion, stirring is started, and the stirring speed is adjusted to 300-800 rpm, and then an aqueous carboxyl-containing high acid value heat-resistant hard acrylic emulsion, an aqueous high-density polyethylene wax microdispersion, an aqueous microdispersion of a high molecular weight organic silicon polymer, an aqueous wetting and leveling agent, a mixture of water and an aqueous defoamer that is pre-dispersed and mixed evenly, an aqueous polycarbodiimide, ammonia water, and a preservative are slowly added in sequence. After the materials are added, the stirring speed is adjusted to 600-1000 rpm, and the mixture is stirred for 30 minutes and fully dispersed and mixed evenly to obtain an aqueous high-wear-resistant and high-temperature-resistant pre-printing varnish.

10. The preparation method according to claim 9, characterized in that: The method also includes sampling to test pH value, viscosity, solid content, abrasion resistance test, high temperature resistance test, and moisture resistance test, and filtering and packaging after passing the test.

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