Water-based oil polish as well as preparation method and application thereof

Abstract

The invention provides water-based oil polish as well as a preparation method and application thereof. The water-based glazing oil is prepared from the following components in parts by weight: 50 to 70 parts of water-soluble acrylic emulsion, 10 to 15 parts of anti-skid particles, 0.1 to 1 part of a cross-linking agent, 0.3 to 3 parts of an auxiliary agent and 15 to 35 parts of a mixed solvent, the anti-skid particles comprise polytetrafluoroethylene particles and polyethylene wax. The specific composition of the water-based oil polish is designed, the water-based oil polish with excellent performance is prepared through the cooperation of all the components, and the water-based oil polish is suitable for being used as a coating for preparing anti-skid cartons.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based varnish and a preparation method and application thereof. Background Art

[0002] As an important part of logistics and commodity packaging, the anti-skid performance of cartons is directly related to the safety of commodities during transportation and storage. The anti-skid cartons on the current market mainly adopt the following technologies: Physical anti-skid technology: such as surface convex-concave treatment, which increases friction by changing the microstructure of the carton surface, but this method often leads to an uneven appearance of the carton, affecting the appearance, and the anti-skid effect is greatly affected by humidity; Chemical coating technology: using solvent-based or water-based anti-skid coatings to form a film layer with a high friction coefficient on the surface of the carton to achieve anti-skid. Although solvent-based anti-skid coatings have good anti-skid effects, they have high VOC emissions and poor environmental protection; and although water-based anti-skid coatings are environmentally friendly, their wear resistance and anti-skid effects are usually weak; Composite material technology: Compounding anti-skid particles with carton materials to increase surface roughness, but the cost is high and the compounding process is complicated.

[0003] In the use of water-based varnish, the existing technology mainly has the following problems: insufficient anti-slip performance: most water-based varnishes fail to effectively increase the friction coefficient while improving the surface finish of the carton, resulting in a lack of obvious anti-slip effect; poor wear resistance: under high friction or heavy pressure, the water-based varnish layer is easily worn, affecting the anti-slip effect and the service life of the carton; printability issues: some water-based varnishes are not compatible with printing inks, affecting printing quality, such as fading, blurring and other problems; balance between environmental protection and performance: while pursuing environmental protection, how to ensure the anti-slip performance and wear resistance of water-based varnish has become a major challenge.

[0004] Therefore, developing a water-based varnish printing technology that can significantly enhance the anti-slip performance of cartons, have good printability, and maintain environmental protection characteristics is of great significance for improving the comprehensive performance of cartons and meeting the market demand for safe, environmentally friendly, and efficient logistics packaging. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention aims to provide a water-based varnish and its preparation method and application. The present invention designs the specific composition of the water-based varnish and prepares a water-based varnish with excellent performance through the coordination of various components, which is suitable for use as a coating for preparing anti-slip cartons.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an aqueous varnish, wherein the aqueous varnish comprises the following components in parts by weight:

[0008]

[0009] The anti-slip particles include polytetrafluoroethylene particles and polyethylene wax.

[0010] The invention designs the specific composition of the water-based glazing oil and prepares the water-based glazing oil with excellent performance through the coordination of various components. The water-based glazing oil is suitable for preparing the coating for anti-skid cartons.

[0011] In the present invention, the use of water-soluble acrylic emulsion makes the water-based glazing oil have better adhesion; the use of anti-skid particles makes the water-based glazing oil have better anti-skid performance; the use of cross-linking agent improves the wear resistance of the water-based glazing oil; the use of mixed solvent makes the water-based glazing oil have better environmental protection.

[0012] Furthermore, the present invention selects a combination of polytetrafluoroethylene particles and polyethylene wax as anti-slip particles, and prepares a water-based varnish with excellent comprehensive performance through the synergistic effect of the polytetrafluoroethylene particles and the polyethylene wax.

[0013] In the present invention, the weight proportion of the water-soluble acrylic emulsion in the aqueous varnish may be 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts, 62 parts, 64 parts, 66 parts, 68 parts or 70 parts, etc.

[0014] The weight proportion of the anti-skid particles in the aqueous varnish may be 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, 14.5 parts or 15 parts, etc.

[0015] The weight proportion of the crosslinking agent in the water-based varnish may be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, etc.

[0016] The weight proportion of the auxiliary agent in the water-based varnish may be 0.3 parts, 0.6 parts, 0.9 parts, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.3 parts, 2.5 parts, 2.7 parts or 3 parts, etc.

[0017] The weight proportion of the mixed solvent in the aqueous varnish may be 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 33 parts or 35 parts, etc.

[0018] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0019] As a preferred technical solution of the present invention, the mass ratio of the polytetrafluoroethylene particles to the polyethylene wax is 1:(1.5-2.5), for example, it can be 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2, 1:2.1, 1:2.2, 1:2.3, 1:2.4 or 1:2.5.

[0020] In the present invention, the comprehensive performance of the water-based varnish is further optimized by controlling the mass ratio of the polytetrafluoroethylene particles and the polyethylene wax within a specific range.

[0021] As a preferred technical solution of the present invention, the average particle size of the polytetrafluoroethylene particles is 0.5-15μm, for example, it can be 0.5μm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm or 15μm, etc.

[0022] Preferably, the number average molecular weight of the polytetrafluoroethylene particles is 5000-20000, for example, 5000, 6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000, 15000, 16000, 17000, 18000, 19000 or 20000, etc.

[0023] As a preferred technical solution of the present invention, the average particle size of the polyethylene wax is 5-15 μm, for example, it can be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm or 15 μm, etc.

[0024] Preferably, the number average molecular weight of the polyethylene wax is 1500-5000, for example, it can be 1500, 1800, 2000, 2200, 2500, 2700, 3000, 3300, 3600, 3800, 4000, 4300, 4600, 4900 or 5000.

[0025] In the present invention, by controlling the average particle size of polytetrafluoroethylene particles and polyethylene wax within a specific range, a water-based varnish with excellent anti-skid performance is prepared. If the average particle size of polytetrafluoroethylene particles and polyethylene wax is too small, the anti-skid performance of the prepared water-based varnish is poor; if the average particle size of polytetrafluoroethylene particles and polyethylene wax is too large, they are unevenly distributed in the coating, making the anti-skid performance unstable.

[0026] As a preferred technical solution of the present invention, the solid content of the water-soluble acrylic emulsion is 30-60%, for example, it can be 30%, 33%, 36%, 39%, 42%, 45%, 48%, 51%, 54%, 57% or 60%.

[0027] Preferably, the cross-linking agent is selected from isocyanate cross-linking agents and / or epoxy cross-linking agents.

[0028] It should be noted that the present invention does not have any special restrictions on the specific selection of isocyanate crosslinking agents and epoxy crosslinking agents, and isocyanate crosslinking agents and epoxy crosslinking agents commonly used in the art are applicable. The isocyanate crosslinking agents exemplarily include but are not limited to: toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate; the epoxy crosslinking agents exemplarily include but are not limited to water-based epoxy resins, water-based polyisocyanates, and silicone-based environmentally friendly water-based room temperature crosslinking agents.

[0029] As a preferred technical solution of the present invention, the auxiliary agent includes the following components in parts by weight:

[0030] Dispersant 0.1-1 part;

[0031] Leveling agent 0.1-1 part;

[0032] Defoaming agent 0.1-1 part.

[0033] In the present invention, the weight proportion of the dispersant in the auxiliary agent can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, etc.

[0034] The weight proportion of the leveling agent in the auxiliary agent can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, etc.

[0035] The weight proportion of the defoaming agent in the auxiliary agent can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, etc.

[0036] Preferably, the dispersant comprises a non-ionic surfactant.

[0037] The present invention does not have any special restrictions on the specific selection of non-ionic surfactants, and all commonly used non-ionic surfactants in the art are applicable.

[0038] Preferably, the leveling agent comprises polyether-modified polydimethylsiloxane.

[0039] Preferably, the defoaming agent comprises polydimethylsilicone.

[0040] As a preferred technical solution of the present invention, the mixed solvent includes 10-20 parts by weight of water (for example, it can be 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight or 20 parts by weight, etc.) and 5-15 parts by weight of ethanol (for example, it can be 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight or 15 parts by weight, etc.).

[0041] In a second aspect, the present invention provides a method for preparing the water-based varnish as described in the first aspect, the preparation method comprising the following steps:

[0042] The components of the water-based varnish are mixed to obtain the water-based varnish.

[0043] As a preferred technical solution of the present invention, the preparation method comprises the following steps:

[0044] (1) mixing a water-soluble acrylic emulsion and a mixed solvent to obtain a mixture 1;

[0045] (2) mixing the mixture 1 and the anti-skid particles to obtain a mixture 2;

[0046] (3) Mix the mixture 2, the crosslinking agent and the auxiliary agent, filter and allow to stand to obtain the water-based varnish.

[0047] Preferably, the standing time is 20-30 h, for example, it can be 20 h, 21 h, 22 h, 23 h, 24 h, 25 h, 26 h, 27 h, 28 h, 29 h or 30 h.

[0048] Preferably, the filter mesh number used for filtration is 80-120 mesh, for example, it can be 80 mesh, 83 mesh, 85 mesh, 88 mesh, 90 mesh, 92 mesh, 95 mesh, 97 mesh, 100 mesh, 102 mesh, 105 mesh, 108 mesh, 110 mesh, 113 mesh, 115 mesh, 117 mesh or 120 mesh, etc.

[0049] It should be noted that the present invention does not have any special restrictions on the mixing method and specific process conditions in steps (1) to (3), and the mixing method and specific process conditions commonly used in the art are applicable.

[0050] In a third aspect, the present invention provides a use of the water-based varnish as described in the first aspect, wherein the water-based varnish is used for preparing anti-slip cartons.

[0051] As a preferred technical solution of the present invention, the cardboard in the anti-slip carton includes B-corrugated cardboard.

[0052] The present invention has no special restrictions on the specific selection of B-corrugated cardboard. The commonly used B-corrugated cardboard in the art is applicable, including but not limited to: the surface paper of the B-corrugated cardboard includes 200g / m 2 Kraft paper, core paper including 140g / m 2 Corrugated paper, lining paper including 160g / m 2 Kraft paper.

[0053] Preferably, the compressive strength of the paperboard in the anti-slip carton is ≥5000N / m 2 , for example, it can be 5000N / m 2 、5200N / m 2 、5400N / m 2 、5600N / m 2 、5800N / m 2 、6000N / m 2 、6200N / m 2 、6400N / m 2 、6600N / m 2 、6800N / m 2 or 7000N / m 2 wait.

[0054] Preferably, the folding strength of the paperboard in the anti-slip carton is ≥350N / m 2 , for example, it can be 350N / m 2 、360N / m 2 、370N / m 2 、380N / m 2 、390N / m 2 , 400N / m 2 , 410N / m 2 , 420N / m 2 , 430N / m 2 , 440N / m 2 or 450N / m 2 wait.

[0055] Preferably, the flat compression strength of the paperboard in the anti-slip carton is ≥7.0N / m 2 , for example, it can be 7.0N / m 2 , 7.1N / m 2 , 7.2N / m 2 , 7.3N / m 2 , 7.4N / m 2 , 7.5N / m 2 , 7.6N / m 2 , 7.7N / m 2 , 7.8N / m 2 , 7.9N / m2 or 8N / m 2 wait.

[0056] Preferably, the moisture content of the paperboard in the anti-slip carton is ≤9%, for example, it can be 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5% or 9%.

[0057] Preferably, the smoothness of the cardboard in the anti-slip carton is ≥30s, for example, it can be 30s, 31s, 32s, 33s, 34s, 35s, 36s, 37s, 38s, 39s or 40s, etc.

[0058] Preferably, the water absorption of the paperboard in the anti-slip carton is 20 to 30 g / m 2 , for example, it can be 20g / m 2 , 21g / m 2 , 22g / m 2 , 23g / m 2 , 24g / m 2 , 25g / m 2 , 26g / m 2 , 27g / m 2 , 28g / m 2 , 29g / m 2 or 30g / m 2 wait.

[0059] Among them, the test method for the compressive strength of the cardboard in the anti-slip carton is: use a whole box compression tester, the environment is tested at a temperature of 16°C and a relative humidity of 60%, and conduct GB4857.4 "Basic Test Pressure Test Method for Transport Packages" test.

[0060] The test method for the folding strength of paperboard in the anti-slip carton is: use a folding strength tester, test at a temperature of 16°C and a relative humidity of 60%, and carry out the ISO 5626-1993 paper folding resistance test.

[0061] The test method for the flat compression strength of the cardboard in the anti-slip carton is: use a computer-controlled compression tester, the environment is tested at a temperature of 16°C and a relative humidity of 60%, and conduct the test in accordance with GB / T2679.6 "Determination of Flat Compression Strength of Corrugated Core".

[0062] The test method for the moisture content of the cardboard in the anti-slip carton is: use a moisture tester, the environment is tested at a temperature of 16°C and a relative humidity of 60%, and conduct the test of GB / T 451.2-2002 "Quantitative Determination of Paper and Cardboard".

[0063] The test method for the smoothness of the cardboard in the anti-slip carton is to use a smoothness tester, and the environment is tested at a temperature of 16°C and a relative humidity of 60%, and conduct the "Determination of the Smoothness of Paper and Cardboard (Buick Method)" GB455.1 test.

[0064] The test method for the water absorption of paperboard in the anti-slip carton is to use a water absorption tester, and the environment is tested at a temperature of 16°C and a relative humidity of 60%, and conduct GB 1540-2002 | Determination of water absorption of paper and paperboard (Cobber method) test.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] (1) The present invention designs the specific composition of the water-based varnish, selects a combination of polytetrafluoroethylene particles and polyethylene wax as anti-slip particles, and prepares a water-based varnish with excellent performance through the synergistic effect of the polytetrafluoroethylene particles and the polyethylene wax and the coordinated effect with other components. The water-based varnish is suitable for use as a coating for preparing anti-slip cartons.

[0067] (2) The present invention further optimizes the comprehensive performance of the water-based varnish by controlling the mass ratio of polytetrafluoroethylene particles and polyethylene wax within a specific range. DETAILED DESCRIPTION

[0068] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0069] The sources of some components in the following examples and comparative examples are shown in Table 1 below:

[0070] Table 1

[0071]

[0072]

[0073] Example 1-Example 15, Comparative Example 1-Comparative Example 2

[0074] Example 1 to Example 15 and Comparative Example 1 to Comparative Example 2 respectively provide a water-based varnish, and the specific composition of the water-based varnish is shown in Table 2 and Table 3 below (the amount of each component in Table 2 and Table 3 is in parts by weight).

[0075] Preparation method of the aqueous glazing oil:

[0076] (1) mixing a water-soluble acrylic emulsion, water and ethanol at 25° C. and 400 rpm to obtain a mixture 1;

[0077] (2) adjusting the rotation speed to 200 rpm, and uniformly mixing the mixture 1, the polytetrafluoroethylene particles, and the polyethylene wax at 25° C. to obtain a mixture 2;

[0078] (3) Mix the mixture 2, the crosslinking agent, the defoaming agent, the dispersant and the leveling agent at 25° C., filter the mixture using a 100-mesh filter, and allow the mixture to stand for 24 hours to obtain the water-based varnish.

[0079] Table 2

[0080]

[0081]

[0082] Table 3

[0083]

[0084] The water-based varnishes provided in the above embodiment and comparative example are respectively used to prepare anti-slip cartons, and the specific methods are as follows:

[0085] Choose a carton with a clean surface and no oil stains (the cardboard is B-pit corrugated cardboard, and the surface paper is 200g / m 2 Kraft paper, core paper is 140g / m 2 Corrugated paper, lining paper is 160g / m 2 Kraft paper);

[0086] Use a flexographic printing machine to evenly apply water-based varnish on the surface of the carton, with a coating amount of 18g / m 2 ;

[0087] Drying at 80° C. for 5 minutes to ensure that the water-based varnish is completely cured to obtain the anti-slip carton;

[0088] Among them, the process parameters for applying water-based varnish on the surface of carton using flexographic printing machine are:

[0089]

[0090] The performance of the anti-slip carton prepared by the water-based varnish provided in the above embodiment and comparative example was tested, and the specific test method is as follows (Testing instructions: the following testing environment is tested at a temperature of 16° C. and a relative humidity of 60%):

[0091] (1) Printing effect: When the printed surface is smooth and bright, the flatness is good, the printing adaptability is good, the printing is clear and bright, it is not easy to be scratched, and there is no fading or falling off, it indicates that the printing effect is good; when the printed surface is relatively smooth and flat, the printing is clear and visible, the appearance is good, and there is no fading or falling off, it indicates that the printing effect is average; when the printed product is not smooth and flat, the printed color is uneven, and there is partial fading and falling off, it indicates that the printing effect is poor.

[0092] (2) Glossiness refers to the reflective ability of the printed surface and is one of the important indicators for measuring the quality of printed products. The level of glossiness directly affects the visual effect and texture of the printed product.

[0093] Gloss test: Use a 60-degree gloss meter to test three sets of data in the upper, middle and lower ranges of one side of the anti-slip carton, and record the range values ​​obtained;

[0094] (3) Abrasion resistance refers to the ability of the printed surface to resist wear.

[0095] Abrasion resistance test: rub the paper surface against the test anti-slip carton, under a load of 1.8kg, at a speed of 43±2 reciprocating / min, and a stroke of 25±5mm, and record the number of frictions until the base color of the substrate is exposed;

[0096] (4) Adhesion refers to the bonding strength between the glazing oil and the printed product surface. The quality of adhesion directly affects the service life of the glazing oil and the quality of the printed product.

[0097] Adhesion test: Use 3M600 standard tape to stick tightly on the test part (the tape sticking length is ≥25mm, which can be adjusted according to the size of the box surface), wipe the tape with an eraser with a force of 12N, and wipe back and forth three times; grab one end of the tape with your hand, pull off the tape within 0.5s to 1s at a 60° direction, and observe whether the coating is damaged or discolored.

[0098] (5) Anti-slip angle test: Use an inclined plane friction coefficient tester, parameters: inclined plane lifting speed: 2° / s, test three times (the error between data is less than 3°), and record the average value.

[0099] The test data is shown in Table 4 below:

[0100] Table 4

[0101] Printing Effect Glossiness Wear resistance (times) Adhesion Anti-slip angle (°) Example 1 good 30-35 4050 No fading 30 Example 2 good 30-35 3850 No fading 30 Example 3 generally 28-32 3550 No fading 28 Example 4 generally 28-32 3350 No fading 26 Example 5 generally 28-32 3550 No fading 26 Example 6 generally 25-28 3250 No fading 24 Example 7 generally 25-28 3200 No fading 24 Example 8 generally 28-32 3850 No fading 26 Example 9 generally 28-32 3600 No fading 24 Example 10 generally 25-28 3650 No fading 30 Embodiment 11 generally 25-28 3650 No fading 26 Example 12 generally 28-32 3780 No fading 30 Embodiment 13 generally 28-32 3850 No fading 26 Embodiment 14 generally 25-28 3650 No fading 28 Embodiment 15 generally 25-28 3550 No fading 24 Comparative Example 1 generally 22-25 3150 No fading 24 Comparative Example 2 generally 22-25 3100 No fading 24

[0102] The present invention designs the specific composition of the water-based glazing oil, selects a combination of polytetrafluoroethylene particles and polyethylene wax as anti-skid particles, and prepares the water-based glazing oil with excellent performance through the synergistic effect of the polytetrafluoroethylene particles and the polyethylene wax and the cooperation with other components. The water-based glazing oil is suitable for preparing the coating for anti-skid cartons, and the printed surface is relatively smooth and flat, the printing is clearly visible, the appearance is good, no fading and falling off occurs, the glossiness is ≥25, specifically 25-35, under a load of 1.8 kg, rubbed at a speed of 43±2 reciprocating / min, and a stroke of 25±5 mm, and can be rubbed at least 3200 times, specifically 3200-4050 times, before the base color of the substrate is exposed by rubbing, and no fading is found after adhesion test, and the anti-skid angle is ≥24°, specifically 24°-30°.

[0103] It can be seen from Examples 1-15 that the present invention further optimizes the comprehensive performance of the water-based varnish by controlling the mass ratio of polytetrafluoroethylene particles and polyethylene wax within a specific range and controlling the average particle sizes of polytetrafluoroethylene particles and polyethylene wax within specific ranges. The anti-slip carton prepared by the water-based varnish has excellent performance, the printed surface is relatively smooth and flat, the printing is clearly visible, the appearance is good, there is no fading and falling off, the gloss is ≥28, specifically 28-35, under a load of 1.8kg, at a speed of 43±2 reciprocating / min, 25±5mm stroke for friction, before the friction exposes the base color of the substrate, it can be rubbed at least 3350 times, specifically 3350-4050 times, no fading after adhesion test, and the anti-slip angle is ≥24°, specifically 24°-30°.

[0104] It can be seen from Comparative Examples 1-2 that the present invention prepares a water-based varnish with excellent performance through the synergistic effect of polytetrafluoroethylene particles and polyethylene wax.

[0105] In summary, the present invention designs the specific composition of the water-based varnish, selects a combination of polytetrafluoroethylene particles and polyethylene wax as anti-slip particles, and prepares a water-based varnish with excellent performance through the synergistic effect of the polytetrafluoroethylene particles and the polyethylene wax and the coordinated effect with other components. The water-based varnish is suitable for use as a coating for preparing anti-slip cartons.

[0106] The applicant declares that the present invention illustrates the detailed process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A water-based varnish, characterized in that: The aqueous glazing oil comprises the following components in parts by weight: The anti-slip particles include polytetrafluoroethylene particles and polyethylene wax.

2. The water-based varnish according to claim 1, characterized in that: The mass ratio of the polytetrafluoroethylene particles to the polyethylene wax is 1:(1.5-2.5).

3. The water-based varnish according to claim 1 or 2, characterized in that: The average particle size of the polytetrafluoroethylene particles is 0.5-15 μm; Preferably, the number average molecular weight of the polytetrafluoroethylene particles is 5000-20000.

4. The water-based varnish according to any one of claims 1 to 3, characterized in that: The average particle size of the polyethylene wax is 5-15 μm; Preferably, the number average molecular weight of the polyethylene wax is 1500-5000.

5. The water-based varnish according to any one of claims 1 to 4, characterized in that: The solid content of the water-soluble acrylic emulsion is 30-60%; Preferably, the cross-linking agent is selected from isocyanate cross-linking agents and / or epoxy cross-linking agents.

6. The water-based varnish according to any one of claims 1 to 5, characterized in that: The auxiliary agent includes the following components in parts by weight: Dispersant 0.1-1 part; Leveling agent 0.1-1 part; Defoaming agent 0.1-1 part; Preferably, the dispersant comprises a nonionic surfactant; Preferably, the leveling agent comprises polyether-modified polydimethylsiloxane; Preferably, the defoaming agent comprises polydimethylsilicone.

7. The water-based varnish according to any one of claims 1 to 6, characterized in that: The mixed solvent includes 10-20 parts by weight of water and 5-15 parts by weight of ethanol.

8. A method for preparing the water-based varnish according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: The components of the water-based varnish are mixed to obtain the water-based varnish.

9. The preparation method according to claim 8, characterized in that: The preparation method comprises the following steps: (1) How to mix water-soluble acrylic acid with a mixed solvent to obtain a mixture 1; (2) mixing the mixture 1 and the anti-skid particles to obtain a mixture 2; (3) Mix the mixture 2, the crosslinking agent and the auxiliary agent, filter and allow to stand to obtain the water-based varnish.

10. A use of the water-based varnish according to any one of claims 1 to 8, characterized in that: The water-based varnish is used for preparing anti-slip cartons.

Images