Antiskid and sewage-resistant paint and preparation method thereof

Abstract

The application discloses an antiskid and sewage-resistant water-based paint and a preparation method thereof, and relates to the technical field of tableware paint. The water-based paint comprises A liquid and B liquid. The A liquid comprises the following components: 35-60 parts of emulsion type organic silicon water dispersion resin; 3-10 parts of maleic anhydride grafted polypropylene wax emulsion; 5-10 parts of elastomer modified acrylic dispersion; 0.5-1.2 parts of dispersant; 1-3 parts of thickening agent; 3-8 parts of nano alumina dispersion liquid; 15-25 parts of water-based color paste; 0.3-1 part of emulsified corrugated auxiliary agent; 0.1-1 part of substrate wetting agent; 0.1-1 part of defoaming agent; and 3-5 parts of deionized water. The B liquid comprises the following components: 90-100 parts of water-based isocyanate curing agent; 0.3-0.8 parts of dehydrating agent; 5-8 parts of adhesion promoter; and 2-5 parts of film forming auxiliary agent. The application provides an innovative two-component water-based paint system. After the A liquid and the B liquid are mixed, the components synergistically act, and the multiple requirements of tableware or catering auxiliary tools for the antiskid, sewage-resistant, adhesive and environmental protection of the coating are comprehensively solved. The coating completely meets the high standard requirements of food contact materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tableware coating, in particular to an anti-slip and stain-resistant water-resistant coating and a preparation method thereof. BACKGROUND

[0002] Plastic tableware and catering auxiliary appliances (such as trays, etc.) have become an important solution in the field of food packaging and catering services due to their lightweight, durable, and low-cost characteristics. However, traditional plastic substrates have inherent defects: their surface energy is relatively low, resulting in insufficient water and oil resistance, especially when in contact with greasy or high-moisture foods, which can easily penetrate, causing deformation, contamination, and even food safety hazards. To improve functionality, the industry generally uses surface coating technology, which applies special coatings to plastic substrates (such as PP, PS, etc.) to enhance hydrophobic and oleophobic properties, wear resistance, and easy-to-clean performance.

[0003] Traditional tableware coatings are mostly solvent-based, such as the anti-slip and stain-resistant tableware paint disclosed in Chinese patent application CN201911384689.1, which consists of polyester resin, long-grafted chain organosilicon anti-stain leveling agent, organotin drier, and solvent (ethyl acetate or n-butyl acetate), and has excellent chemical resistance and stain resistance. However, this type of coating releases a large amount of volatile organic compounds (VOCs) during production and use, not only causing environmental pollution, but also posing a potential threat to the health of production personnel and consumers. With the increasing strictness of global environmental regulations and the significant improvement of public environmental awareness, there is an urgent need for environmentally friendly tableware coatings with low VOC emissions in the market, and water-based coatings are considered an ideal alternative due to their low VOC content and environmental advantages of using water as the main dispersion medium.

[0004] However, the water-based tableware coatings currently on the market face a series of interrelated key performance defects in actual application, which seriously restricts their widespread promotion and user satisfaction. Some coatings have insufficient anti-slip performance, and the tableware placed on the tray during use is prone to sliding, causing food spills and potential safety hazards such as burns. Moreover, they do not perform well in terms of stain resistance and anti-sauce bleeding, making it difficult to completely clean common stains such as soy sauce and chili oil, and pigment easily penetrates into the coating interior to form stubborn color spots, damaging the product appearance. In addition, the adhesion of existing water-based coatings to plastic substrates is generally poor, and after repeated use or mechanical cleaning (such as high-temperature, high-pressure water flow impact, and strong alkaline detergent cleaning environment in dishwashers), the coating is prone to blistering, cracking, peeling, discoloration, and loss of gloss, resulting in functional failure and accelerated microplastic release, which cannot meet consumers' core needs for long-lasting and easy-to-clean trays.

[0005] Therefore, developing a kind of high-performance water-based environmental protection coating with excellent anti-skid effect, stain resistance and strong adhesion to plastic substrate has important technical value and urgent practical significance in the field of tableware manufacturing. SUMMARY

[0006] To overcome the deficiencies of the prior art, the present application aims to provide a water-based coating with excellent anti-skid effect, stain resistance and strong adhesion to plastic substrate.

[0007] The present application is realized by the following technical solutions:

[0008] In the first aspect, the present application provides an anti-skid and stain-resistant water-based coating, comprising A liquid and B liquid.

[0009] The A liquid comprises the following components by weight fraction: emulsion type silicone water dispersion resin 35-60 parts; maleic anhydride grafted polypropylene wax emulsion 3-10 parts; elastomer modified acrylic dispersion 5-10 parts; dispersant 0.5-1.2 parts; thickening agent 1-3 parts; nano-sized alumina dispersion liquid 3-8 parts; water-based color paste 15-25 parts, emulsified corrugated auxiliary agent 0.3-1 part; substrate wetting agent 0.1-1 part; defoaming agent 0.1-1 part; deionized water 3-5 parts.

[0010] The B liquid comprises the following components by weight fraction: water-based isocyanate curing agent 90-100 parts, dehydrating agent 0.3-0.8 parts, adhesion promoter 5-8 parts, film-forming aid 2-5 parts.

[0011] The present application provides an innovative two-component water-based coating system, which solves the multiple requirements of tableware for anti-slip, stain resistance, adhesion and environmental protection by the synergistic effect of A liquid and B liquid after mixing. A liquid uses emulsion type silicone water dispersion resin, maleic anhydride grafted polypropylene wax emulsion and elastomer modified acrylic dispersion, the emulsion type silicone water dispersion resin constitutes the flexible and temperature-resistant base of the coating, endows it with excellent hydrophobicity and low surface energy, realizes stain resistance and easy cleaning function; the active hydroxyl group of the elastomer modified acrylic dispersion provides key crosslinking reaction sites for the system, and greatly enhances the impact toughness and substrate adhesion of the coating; the maleic anhydride grafted polypropylene wax emulsion forms a uniform micro-rough structure on the surface of the coating after film formation, thereby significantly increasing the friction coefficient and improving the anti-slip effect; the water-based isocyanate curing agent in B liquid reacts with the active hydroxyl group in the A liquid system to form a dense three-dimensional network structure, effectively improving the hardness, wear resistance and chemical resistance of the coating; at the same time, the addition of emulsified corrugated auxiliary agent makes the paint film present a special texture effect, which improves the aesthetic appearance of the paint film, and further improves the anti-slip performance of the paint film by increasing the contact area; the nanoscale alumina dispersion liquid as a nano-enhanced phase optimizes the surface microstructure in cooperation with the wax particles, and improves the impact resistance and anti-slip effect. In addition, the dispersant and defoaming agent ensure the storage stability and film density of each component, and the substrate wetting agent effectively reduces the surface tension of the system, ensuring excellent wetting and adhesion to the plastic substrate.

[0012] Further, the solid content of the emulsion type silicone water dispersion resin is 36%-40%. As a preferred embodiment, the emulsion type silicone water dispersion resin of the present application is selected from KW-8924 of Kowin Industrial (Shanghai) Co., Ltd.

[0013] Further, the solid content of the maleic anhydride grafted polypropylene wax emulsion is 34%-42%. As a preferred embodiment, the maleic anhydride grafted polypropylene wax emulsion of the present application is selected from Emulsion 94340 of Michelman.

[0014] Further, the hydroxyl value of the elastomer modified acrylic dispersion is 100-120 mgKOH / g. As a preferred embodiment, the elastomer modified acrylic dispersion of the present application is selected from SX-500-2 of Kunshan Wanjie New Material Technology Co., Ltd.

[0015] Further, the dispersant is selected from polyether modified styrene-maleic anhydride copolymer aqueous solution; the solid content of the polyether modified styrene-maleic anhydride copolymer aqueous solution is 35%-45%. As a preferred embodiment, the dispersant of the present application is selected from DISPERBYK-190 of BYK-Chemie.

[0016] Further, the thickening agent is selected from hydrophobically modified alkali-swellable thickening agent. As a preferred embodiment, the thickening agent is H-120 thickening agent from Puwei (Shanghai) New Material Technology Co., Ltd.

[0017] Further, the particle size D50 of the nanoscale alumina dispersion liquid is 120-150 nm, and the solid content is 30%-40%. As a preferred embodiment, the nanoscale alumina dispersion liquid of the present application is selected from TAD-HA30 and TAD-HA40 from Nanjing Tianxing New Material Co., Ltd.

[0018] Further, the aqueous color paste is selected from food contact grade aqueous color paste, and the solid content is 40%-60%.

[0019] The aqueous color paste of the present application can be obtained by purchase or self-preparation. The present application provides a preparation method of aqueous color paste, comprising the steps of:

[0020] S1. Add water, dispersant and defoaming agent, and disperse uniformly at 300-500 rpm;

[0021] S2. Add food grade pigment powder under stirring at 200-300 rpm, and increase the speed to 500-700 rpm for uniform dispersion;

[0022] S3. After uniform dispersion, increase the speed to 800-1000 rpm and disperse for at least 30 minutes;

[0023] S4. Transfer to a horizontal grinding machine and grind to a fineness of <15 μm;

[0024] S5. Add stabilizer, and adjust the viscosity of the color paste to the required solid content range with water.

[0025] Further, the emulsified corrugation aid is an organic silicon polymer emulsion. As a preferred embodiment, the emulsified corrugation aid of the present application is selected from HY-8082 from Haiyue (Qingyuan) New Material Co., Ltd.

[0026] Further, the substrate wetting agent is selected from polyether siloxane copolymer. As a preferred embodiment, the substrate wetting agent of the present application is selected from Wet 270 from TEGO.

[0027] Further, the defoaming agent is selected from polyether siloxane copolymer emulsion containing fumed silica; the mass content of polyether siloxane copolymer in the polyether siloxane copolymer emulsion containing fumed silica is 15%-25%. As a preferred embodiment, the defoaming agent of the present application is selected from Airex 902 W from TEGO.

[0028] Further, the NCO content of the aqueous isocyanate curing agent is 16%-18%. As a preferred embodiment, the aqueous isocyanate curing agent of the present application is selected from AQUAPU-379 of Jiangsu Fuchi Sen New Material Co., Ltd.

[0029] Further, the dehydrating agent is selected from a titanate dehydrating agent or a molecular sieve dehydrating agent.

[0030] Further, the adhesion promoter is selected from γ-(2,3-epoxypropoxy) propyl trimethoxysilane (KH560).

[0031] Further, the film-forming aid is selected from one or more of propylene glycol methyl ether acetate PMA, ethylene glycol diacetate EGDA, and propylene glycol diacetate PGDA.

[0032] Further, the weight ratio of the A liquid and the B liquid in the aqueous coating is 5:1-6:1.

[0033] In a second aspect, the present application provides a preparation method of the aqueous coating, comprising the following steps:

[0034] Preparation of the A liquid: sequentially add the emulsion type silicone water dispersion resin, the dispersing agent, the maleic anhydride grafted polypropylene wax emulsion, the substrate wetting agent, and the deionized water into a container, and stir at a speed of 300-500 rpm for 15-20 minutes to uniformly disperse the components; then add the elastomer modified acrylic dispersion, the aqueous color paste, the nano-sized alumina dispersion liquid, and the emulsified corrugated aid, increase the stirring speed to 800-1000 rpm, and continue to stir for 30-40 minutes to uniformly mix the components; further add the defoaming agent and the thickening agent, and continue to stir for 10-15 minutes to obtain the A liquid;

[0035] Preparation of the B liquid: add the film-forming aid into another container, stir at a speed of 200-300 rpm, then add the dehydrating agent, stir and disperse at a speed of 300-500 rpm for 30-50 minutes, further add the adhesion promoter and the aqueous isocyanate curing agent, and continue to stir for 20-30 minutes to uniformly mix the components, thereby obtaining the B liquid;

[0036] In use, the A liquid and the B liquid are uniformly mixed to obtain the aqueous coating for tableware.

[0037] Further, the weight ratio of the A liquid and the B liquid is 5:1-6:1.

[0038] In a third aspect, the present application provides the application of the aqueous coating in the field of manufacturing tableware or catering auxiliary appliances. Specifically, the aqueous coating is suitable for products such as tableware, plates, and tableware trays.

[0039] The present application has the following beneficial effects:

[0040] The water-based paint of the present application forms a unique surface microstructure through the interaction of each component to provide durable and reliable slip resistance, the low surface energy and high crosslinking network of the silicone resin ensure excellent stain resistance and easy cleaning; through the synergistic effect of wetting, adhesion and crosslinking, it realizes extremely strong adhesion to the plastic substrate; the nanoscale alumina dispersion liquid as a nanoscale reinforcing phase optimizes the surface microstructure synergistically with the wax particles, and together improves the impact resistance and slip resistance; thereby realizing the comprehensive performance of slip resistance, stain resistance and high adhesion, which can meet the use demand of high-performance water-based environmentally friendly paint in the field of tableware or catering auxiliary appliance manufacturing.

[0041] The paint of the present application adopts a water-based environmentally friendly system, has extremely low VOCs, is safe and non-toxic, and the coating completely meets the high standard requirements of food contact materials, and is an advanced coating solution with high performance and environmental friendliness. DETAILED DESCRIPTION

[0042] The following examples are provided to better further understand the present application, and are not limited to the best mode, and do not constitute a limitation on the content and scope of protection of the present application, and any person under the inspiration of the present application or the combination of the present application with other prior art features obtains any product identical or similar to the present application, which falls within the scope of protection of the present application.

[0043] The specific experimental steps or conditions are not specified in the examples, and can be performed according to the conventional experimental steps described in the literature. The reagents or instruments used are not specified by the manufacturer, and are conventional reagent products that can be obtained by purchase.

[0044] The materials used in the examples and comparative examples of the present application are described as follows, but are not limited to these materials:

[0045] Emulsion-type silicone water dispersion resin: solid content is 38±2%, KW-8924, Kowin Industry (Shanghai) Co., Ltd.

[0046] Water-based hydroxyl acrylate dispersion resin: solid content is 45±2%, Huangshan Liansu New Material Technology Co., Ltd., Uacryl 1633.

[0047] Maleic anhydride grafted polypropylene wax emulsion: solid content is 40±0.5%, Emulsion 94340, Michaelman.

[0048] Elastomer-modified acrylic dispersion: hydroxyl value is 110±8 mgKOH / g, SX-500-2, Kunshan Wanjie New Material Technology Co., Ltd.

[0049] Dispersant: polyether-modified styrene-maleic anhydride copolymer aqueous solution, solid content 40±2%, DISPERBYK-190, BYK.

[0050] Thickening agent: H-120, Puwei (Shanghai) New Material Technology Co., Ltd.

[0051] Nanoscale alumina dispersion liquid: particle size D50 is 150 nm, solid content is 40%, Nanjing Tianxing New Material Co., Ltd., TAD-HA40.

[0052] Water-based color paste: self-made, the preparation method is as follows:

[0053] S1. In the stirring tank, add 35 parts by weight of deionized water, 4 parts by weight of dispersant (Disperbyk-2015, BYK) and 0.2 parts by weight of defoaming agent (Tego Airex 901W, Evonik), stir at a speed of 450 rpm for 5 minutes, mix evenly;

[0054] S2. Slowly add titanium dioxide (food grade rutile titanium dioxide) 50 parts under stirring at 300 rpm to prevent dust flying, after adding, increase the speed to 700 rpm and disperse for 20 minutes;

[0055] S3. After uniform dispersion, increase the speed to 1000 rpm and disperse at high speed for 45 minutes;

[0056] S4. Transfer to a horizontal grinder and grind to a fineness of <15 μm;

[0057] S5. Add 4 parts by weight of propylene glycol, adjust the viscosity of the color paste to a solid content of 50% with deionized water at 500 rpm, and reserve.

[0058] Emulsified corrugated aid: HY-8082, Haibo (Qingyuan) New Material Co., Ltd.

[0059] Substrate wetting agent: polyether siloxane copolymer, TEGO Wet 270.

[0060] Defoaming agent: polyether siloxane copolymer emulsion containing fumed silica, mass content of polyether siloxane copolymer is 20%, TEGO Airex 902 W.

[0061] Waterborne isocyanate curing agent: 17.0±1%, Jiangsu Fuchisen New Material Co., Ltd., AQUAPU-379.

[0062] Dehydrating agent: molecular sieve type dehydrating agent, Guangdong Shunde Lishuda Chemical Co., Ltd., BF-5.

[0063] Adhesion promoter: KH560, Nanjing Jingtianwei Chemical Co., Ltd.

[0064] Film forming aid: PMA and PGDA were compounded at a weight ratio of 1:2.

[0065] Polyethylene wax emulsion: solid content of 40±0.5%, Emulsion 91240G, Michelman.

[0066] The preparation method of the water-based paint of the examples and comparative examples comprises the following steps:

[0067] Preparation of A liquid: the emulsion type silicone water dispersion resin was added into a stirred kettle, the stirring was started, the stirring speed was set to 400 rpm, the dispersant, the maleic anhydride grafted polypropylene wax emulsion, the substrate wetting agent, the deionized water were sequentially added, and the stirring was continued for 20 minutes to make the components fully dispersed and uniform; then the elastomer modified acrylic dispersion, the water-based color paste, the nano-sized aluminum oxide dispersion liquid, and the emulsified corrugation aid were added, the stirring speed was increased to 1000 rpm, and the stirring was continued for 30 minutes to make the components uniformly mixed; then the defoaming agent and the thickening agent were added, and the stirring was continued for 15 minutes to obtain the A liquid;

[0068] Preparation of B liquid: the film forming aid was added into another stirred kettle, and stirred at a speed of 200 rpm, then the dehydrating agent was added, and stirred and dispersed at a speed of 500 rpm for 30 minutes, then the adhesion promoter and the water-based isocyanate curing agent were added, and the stirring was continued for 30 minutes to make the components uniformly mixed to obtain the B liquid;

[0069] In use, the A liquid and the B liquid were uniformly mixed to obtain the water-based paint.

[0070] Table 1: composition and amount (by weight fraction) of the water-based paint of examples 1-3 and comparative examples 1-5

[0071]

[0072] Related performance tests:

[0073] Sample preparation: the examples and comparative examples were mixed according to the weight ratio of A liquid to B liquid of 5:1 to obtain the water-based paint. The 100 mm*100 mm*3 mm polypropylene (PP) plastic plate substrate was cleaned with anhydrous ethanol, the mixed paint was sprayed to prepare a plate, the plate was leveled at room temperature for 10 minutes, then placed in a 60°C oven for drying for 2 hours, and then stored at room temperature for 24 hours to form a coating layer with a dry film thickness of about 35 μm, which was used for testing.

[0074] 1. Adhesion

[0075] Test according to standard GB / T 9286-2021. Test method as follows: Using a crosshatch cutter with a 1mm spacing, draw 6x6 squares on the surface of the sample coating, cutting through to the substrate. Gently sweep away the debris with a soft brush, then firmly adhere a 3M 610 pressure sensitive adhesive tape, pressing the tape to ensure no air bubbles, and quickly tear away at a 60° angle within 1 minute. Observe the squares under a magnifying glass in a light box and rate the coating failure according to the standard, from 0 (perfect) to 5 (severe failure). 0 is the best.

[0076] 2. Impact resistance

[0077] Test according to standard GB / T 20624.2-2006. Test method as follows: Using a falling weight impact tester, place the sample panel face down on the impact platform and secure. Drop a 1kg weight (12.7mm diameter) from a height, impacting the back of the panel. Increase the height incrementally, observing the impact area for cracking, chipping, and other damage after each test. Record the maximum height (in cm) at which the coating does not fail, with a higher value indicating better impact resistance.

[0078] 3. Slip resistance

[0079] Test method as follows: Using a static coefficient of friction tester, secure the sample panel to the platform surface and place a standard stainless steel weight (with a standard rubber foot on the bottom, total mass 200g) on the test area of the panel. Start the device and slowly tilt the platform at a constant rate (1.5° / s), recording the tilt angle at which the weight begins to slide using an angle sensor. Repeat the test 3 times and average the results. A smaller angle indicates poorer slip resistance, while a larger angle indicates better slip resistance.

[0080] 4. Stain resistance

[0081] Test method as follows: Apply a few drops of test liquid (soy sauce, rice vinegar, chili oil, mustard, red wine) to the surface of a horizontally placed sample panel and immediately cover with a watch glass to prevent evaporation. After 24 hours in a (23±2) °C environment, remove the watch glass and rinse the test area with water and wipe dry with a soft cloth. Observe the coating surface under diffuse light, rating as "fail" if discoloration, blistering, loss of gloss, or other visible changes are observed, or "pass" if no changes are observed.

[0082] 5. Boiling water resistance

[0083] The test method is as follows: the sample plate is completely immersed in constant temperature distilled water at 90℃, and one cycle lasts for 45 minutes; after completion, the sample plate is taken out, the surface moisture is absorbed with filter paper, and is recovered for 1 hour under standard environment; whether the sample plate appears phenomena such as blistering, peeling, whitening and the like is observed. This is repeated for 20 cycles. If the sample plate has no any adverse change after 20 cycles, it is evaluated as “pass”, otherwise as “fail”.

[0084] 6. Migration test

[0085] (1) Total migration amount: tested according to standard GB 31604.8-2021; the total migration amount is required to be ≤10 mg / dm 2 .

[0086] (2) Potassium permanganate consumption amount: tested according to standard GB 31604.2-2016; the potassium permanganate consumption amount is required to be ≤10 mg / kg;

[0087] (3) Heavy metal (calculated as Pb) content: tested according to standard GB 31604.9-2016; the heavy metal content is required to be ≤1 mg / kg.

[0088] Table 2. Test results of relevant properties of water-based coatings of examples 1-3 and comparative examples 1-5

[0089]

[0090] It can be seen from the results of the above examples and comparative examples that the water-based coating for tableware of the present application can give consideration to the comprehensive properties of high adhesion, anti-slip and stain resistance. The adhesion test can reach the optimal 0 level; the impact resistance is excellent (the maximum impact height of the coating without damage is ≥55 cm); the sliding angle in the anti-slip test is ≥35°; good stain resistance is shown to all test stains; the boiling water resistance test is passed, and it is suitable for mechanical cleaning methods such as dishwashers; and the coating completely meets the high standard requirements of food contact materials, and can meet the use requirements of high-performance water-based environmentally friendly coatings in the field of tableware or catering auxiliary appliance manufacturing.

[0091] Comparative example 1 does not add maleic anhydride grafted polypropylene wax emulsion, and the impact resistance, anti-slip property and stain resistance are all significantly decreased, and the migration test cannot meet the standard of food contact materials.

[0092] Comparative example 2 selects polyethylene wax emulsion instead of maleic anhydride grafted polypropylene wax emulsion, and the impact resistance, anti-slip property and stain resistance are all deteriorated.

[0093] Comparative example 3 does not add elastomer modified acrylic dispersion, and the adhesion and impact resistance are sharply deteriorated, the stain resistance and boiling water resistance tests are failed, and the migration test cannot meet the standard of food contact materials.

[0094] Comparative Example 4 did not add nano-alumina dispersion liquid, and the adhesion, impact resistance and slip resistance were all decreased.

[0095] Comparative Example 5 selected an aqueous hydroxy acrylate dispersion resin instead of using the emulsion type silicone water dispersion resin, and the adhesion, slip resistance and boiling water resistance were all deteriorated.

[0096] The above examples are merely illustrative for the sake of clarity and are in no way intended to limit the scope of the embodiments. Other variations and modifications can be made to the embodiments described above by those of ordinary skill in the art without departing from the scope of the present disclosure. None of the elements and components as given herein or to elements of a similar nature in the art are intended to be limiting, unless explicitly described as such. Changes in form and detail can be made without departing from the spirit of the application as expressed in the appended claims.

Claims

1. An antiskid and stain resistant water-based paint, characterized by, The A liquid and the B liquid are included; The A liquid includes the following components in parts by weight: emulsion type silicone water dispersion resin 35-60 parts; maleic anhydride grafted polypropylene wax emulsion 3-10 parts; elastomer modified acrylic dispersion 5-10 parts; dispersant 0.5-1.2 parts; thickening agent 1-3 parts; nanoscale alumina dispersion liquid 3-8 parts; water-based color paste 15-25 parts; emulsified corrugation aid 0.3-1 part; substrate wetting agent 0.1-1 part; defoaming agent 0.1-1 part; deionized water 3-5 parts; The B liquid includes the following components in parts by weight: water-based isocyanate curing agent 90-100 parts, dehydrating agent 0.3-0.8 parts, adhesion promoter 5-8 parts, film forming aid 2-5 parts. The solid content of the emulsion type silicone water dispersion resin is 36%-40%; the solid content of the maleic anhydride grafted polypropylene wax emulsion is 34%-42%; the hydroxyl value of the elastomer modified acrylic dispersion is 100-120 mgKOH / g.

2. The aqueous coating of claim 1, wherein, The dispersant is selected from a polyether modified styrene-maleic anhydride copolymer aqueous solution; the solid content of the polyether modified styrene-maleic anhydride copolymer aqueous solution is 35%-45%.

3. The aqueous coating of claim 1, wherein, The thickening agent is selected from a hydrophobic modified alkali-swellable thickening agent; the particle size D50 of the nanoscale alumina dispersion liquid is 120-150 nm, and the solid content is 30%-40%; the water-based color paste is selected from a food contact grade water-based color paste, and the solid content is 40%-60%; the emulsified corrugation aid is an organic silicone polymer emulsion; the substrate wetting agent is selected from a polyether siloxane copolymer.

4. The aqueous coating of claim 1, wherein, The defoaming agent is selected from a polyether siloxane copolymer emulsion containing fumed silica; the mass content of the polyether siloxane copolymer in the polyether siloxane copolymer emulsion containing fumed silica is 15%-25%.

5. The aqueous coating of claim 1, wherein, The NCO content of the water-based isocyanate curing agent is 16%-18%.

6. The aqueous coating of claim 1, wherein, The dehydrating agent is selected from a titanate dehydrating agent or a molecular sieve dehydrating agent; the adhesion promoter is selected from γ-(2,3-epoxypropoxy)propyltrimethoxysilane; the film forming aid is selected from one or more of propylene glycol methyl ether acetate PMA, ethylene glycol diacetate EGDA, and propylene glycol diacetate PGDA.

7. The aqueous coating of claim 1, wherein, The weight ratio of the A liquid to the B liquid is 5:1-6:

1.

8. The aqueous coating of claim 1, wherein, The method includes the following steps:

9. A process for the preparation of an aqueous coating material as claimed in any of claims 1 to 8, characterized in that Preparation of the A liquid: add the emulsion type silicone water dispersion resin, dispersant, maleic anhydride grafted polypropylene wax emulsion, substrate wetting agent, and deionized water into a container in sequence, stir at a speed of 300-500 rpm for 15-20 minutes to disperse the components uniformly; then add the elastomer modified acrylic dispersion, water-based color paste, nanoscale alumina dispersion liquid, and emulsified corrugation aid, increase the stirring speed to 800-1000 rpm and continue stirring for 30-40 minutes to mix the components uniformly; then add the defoaming agent and thickening agent, and continue stirring for 10-15 minutes to obtain the A liquid; ​ Preparation of B liquid: add film forming aid into another container, stir at 200-300 rpm, then add dehydrating agent, stir at 300-500 rpm for 30-50 minutes, then add adhesion promoter and waterborne isocyanate curing agent, continue stirring for 20-30 minutes, mix the components evenly, to obtain B liquid; In use, mix A liquid and B liquid evenly to obtain the anti-skid and stain-resistant waterborne coating.

10. Use of the waterborne coating according to any one of claims 1-8 in the field of cutlery or catering auxiliary appliance manufacturing.

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