A waterborne silicone coating, and a preparation method and application thereof

Abstract

The application discloses water-based organic silicon coating, a preparation method and application thereof, and belongs to the technical field of coating materials.The water-based organic silicon coating comprises 100 parts of water-based vinyl silicone resin, 3-20 parts of water-based hydrogen-containing silicone resin, 3-20 parts of water-based catalyst, 5-20 parts of filler, 3-10 parts of wax emulsion and 50-200 parts of water-based solvent.The water-based organic silicon coating has the advantages that the formed coating has flatness, wear resistance, toughness, excellent touch and high environmental protection, can be applied to the surface of a flexible base body in the fields of 3C digital products, automobile interior decoration and smart wearing, raw materials are easy to obtain, the preparation process is simple, the requirement for production equipment is low, and the water-based organic silicon coating is suitable for large-scale industrialized production.

Description

Technical Field

[0001] The present invention relates to the technical field of organic silicon coatings, and in particular to a water-based organic silicon coating having a soft and tough coating, a silky and delicate touch, and a skin-friendly feel, as well as a preparation method and application thereof. Background Art

[0002] Silicone coatings are a type of coating with low surface energy and low polarity, offering excellent chemical stability. Traditional silicone coatings are widely used in corrosion protection and building protection, but are less commonly used in 3C digital products, automotive interiors, and smart wearables.

[0003] Patents related to silicone coatings currently reported at home and abroad often have various problems such as uneven coatings, poor tactile feel, and substandard environmental performance. For example, CN115260903A discloses a silicone coating for flexible substrates such as silicone and TPU, but a large amount of organic solvents need to be added during use, and the high VOC content can easily have a certain impact on the environment. Patent CN117881755A discloses an aminosiloxane additive for water-based coatings. Although it can improve the smoothness of the coating, the introduction of amino polarity will reduce the anti-fouling performance of the coating and cannot provide a soft and silky touch. Summary of the Invention

[0004] The present invention provides a water-based organosilicon coating and a preparation method and application thereof, which are used to solve the technical problems of existing organosilicon coatings mentioned in the background technology.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0006] A water-based organosilicon coating comprising the following components in parts by weight:

[0007] 100 parts of water-based vinyl silicone resin, 3-20 parts of water-based hydrogenated silicone resin, 3-20 parts of water-based catalyst, 5-20 parts of filler, 3-10 parts of wax emulsion and 50-200 parts of water-based solvent;

[0008] The water-based vinyl silicone resin comprises silicone resin A and an emulsifier, wherein the main chain structure of silicone resin A is , a and b are the number of chain segments; the molecular weight of the silicone resin A is 50,000 to 1,000,000 g / mol; the water-based hydrogenated silicone resin includes silicone resin B and silicone resin C, and the main chain structure of the silicone resin B is , m and n are the number of chain segments; silicone resin C is a hydrogenated MQ silicone resin with the structural formula [(CH3)2HSiO 1 / 2 ] x [(CH3)3SiO 1 / 2 ] y [SiO4 / 2 ] z .

[0009] The design concept of the above technical solution is that the coating system adopts a water-based system, which is VOC-free, environmentally friendly, and free of harmful substances. It is harmless to the human body and can therefore be used as a coating for contact with the skin. The water-based vinyl silicone resin and water-based hydrogenated silicone resin in the system can undergo a cross-linking reaction under the catalysis of a water-based catalyst. The cross-linking and curing mechanism is a hydrosilylation reaction. The reaction speed is fast and the reaction is thorough, thus forming a fully cross-linked flexible coating on the surface of the silicone material. It has good compatibility with the silicone substrate and can adhere to the silicone substrate through intermolecular forces. The present invention uses a high-molecular-weight water-based vinyl silicone resin, which can impart good flexibility to the silicone coating and provide self-lubricating properties, thereby achieving a very low coefficient of friction. At the same time, combined with the water-based hydrogenated MQ silicone resin, it can form a high-crosslinking density reinforced coating and provide a smooth feel. In addition to the silicone resin system, the wax emulsion contains high-density polyethylene microparticles with an average particle size of less than 1 micron, which have excellent self-lubricating and wear-resistant properties. During the cross-linking and curing process of the coating, the polyethylene microparticles can float on the coating surface, further enhancing the tactile feel of the coating.

[0010] As a further preferred embodiment of the above technical solution, the mass of the vinyl groups in the silicone resin A is 0.01% to 5% of the total mass of the silicone resin A.

[0011] As a further preferred embodiment of the above technical solution, the hydrogen content of the silicone resin B is 0.1% to 0.6% by weight; the hydrogen content of the silicone resin B is 0.1% to 0.8% by weight. By adding hydrogen-containing MQ silicone resin to silicone resin B, the coating can be further reinforced and the wear resistance of the coating can be improved.

[0012] As a further preferred embodiment of the above technical solution, the mass ratio of the silicone resin B to the silicone resin C is 1:(0.1-1.5).

[0013] As a further preferred embodiment of the above technical solution, the catalyst is a platinum catalyst with a platinum content of 50 to 10,000 ppm.

[0014] As a further preferred embodiment of the above technical solution, the filler is a silica filler, and the particle size of the filler is 1 to 10 μm.

[0015] As a further preferred embodiment of the above technical solution, the particle size of the wax emulsion is 0.3-20 μm.

[0016] As a further preferred embodiment of the above technical solution, the emulsifier includes at least one of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester, sorbitan fatty acid ester, alkylphenol polyoxyethylene ether, polyether silicone oil emulsifier and polyether emulsifier.

[0017] Based on the same technical concept, the application further provides a preparation method of the water-based organic silicon coating.

[0018] S1, mixing the water-based vinyl silicone resin, the water-based hydrogen-containing silicone resin and the water-based catalyst to obtain a mixture A;

[0019] S2, adding the filler to the mixture A and mixing to obtain a mixture B;

[0020] S3, adding the wax emulsion to the mixture B and mixing to obtain a mixture C;

[0021] S4, adding the water-based solvent to the mixture C and mixing uniformly to obtain the water-based organic silicon coating.

[0022] As a further preferred embodiment of the above technical solution, the mixing speed in S1 is 400-600 rpm, and the mixing time is 5-10 min; the mixing speed in S2 is 600-800 rpm, and the mixing time is 20-30 min; the mixing speed in S3 is 400-600 rpm, and the mixing time is 5-10 min; the mixing speed in S4 is 400-600 rpm, and the mixing time is 10-20 min.

[0023] Based on the same technical concept, the application further provides an application of the water-based organic silicon coating.

[0024] As a further preferred embodiment of the above technical solution, the flexible substrate is a silica gel substrate, a TPU substrate or a TPE substrate.

[0025] As a further preferred embodiment of the above technical solution, the curing time of the water-based organic silicon coating is 60-90 min, and the curing temperature is 90-105℃.

[0026] As a further preferred embodiment of the above technical solution, the coating thickness of the water-based organic silicon coating on the surface of the flexible substrate is 11-23 μm.

[0027] As a further preferred embodiment of the above technical solution, the viscosity of the water-based organic silicon coating during construction is 20-30 s (Zahn Cup 3#), and the solid content of the water-based organic silicon coating during construction is 20%-30%.

[0028] The application has the following advantages:

[0029] (1) The water-based silicone coating of the present application has a coating layer with flatness, wear resistance, toughness, excellent touch and high environmental friendliness, which can be applied to the surface of flexible substrates in the fields of 3C digital products, automotive interiors and smart wear;

[0030] (2) The water-based silicone coating of the present application has easy-to-obtain raw materials, simple preparation process and low requirements for production equipment, and is suitable for large-scale industrial production. DETAILED DESCRIPTION

[0031] The following will be described in detail in combination with the embodiments of the present application, but the present application can be implemented in various different ways limited and covered by the claims.

[0032] The vinyl silicone resin A used in each embodiment of the present application is selected from the product with the trade name of MY 273 produced by Anhui Mingyi Silicone Co., Ltd., the molecular weight of which is 72000 g / mol, and the vinyl content of which is 0.09%;

[0033] The hydrogen-containing silicone resin B used in each embodiment of the present application is selected from the product with the trade name of MY 203 produced by Anhui Mingyi Silicone Co., Ltd., the hydrogen content of which is 0.75%;

[0034] The silicone resin C used in each embodiment of the present application is selected from the product with the trade name of DY-HMQ103 produced by Shandong Dayi Chemical Co., Ltd., the hydrogen content of which is 0.4%;

[0035] The catalyst D used in each embodiment of the present application is selected from the product with the trade name of PC11 produced by Shanghai Zhongxingstar Chemical Technology Co., Ltd., the platinum content of which is 2000 ppm;

[0036] The silica filler used in each embodiment of the present application is the product with the trade name of E-1011 produced by Japan Toho Silica Co., Ltd., the average particle size of which is 1.5 μm;

[0037] The wax emulsion used in each embodiment of the present application is the water-based wax emulsion with the trade name of CT1088 produced by Keim-Additec, Germany.

[0038] Example 1

[0039] The water-based silicone coating of the present application includes the components shown in Table 1 by weight.

[0040] The water-based silicone coating of the present application is prepared by the following method:

[0041] S1, raw material preparation:

[0042] Mix 100 parts of vinyl silicone resin A with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based vinyl silicone resin;

[0043] Mix 70 parts of hydrogen-containing silicone resin B and 30 parts of silicone resin C, then add 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based hydrogen-containing silicone resin.

[0044] Mix 100 parts of catalyst D with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based catalyst.

[0045] S2, add water-based vinyl silicone resin, water-based hydrogen-containing silicone resin, and water-based catalyst to a stirring tank, mix at 500 rpm for 10 min to obtain mixture A;

[0046] S3, add silica filler to mixture A under stirring at 500 rpm, increase the speed to 700 rpm and stir for 20 min to obtain mixture B;

[0047] S4, add wax emulsion to mixture B, disperse at 500 rpm for 10 min to obtain mixture C;

[0048] S5, add deionized water to mixture D, disperse at 400 rpm for 20 min to obtain a water-based silicone coating.

[0049] The water-based silicone coating of the present embodiment can form a coating on the surface of a flexible substrate, which specifically includes the following operations: spray the prepared water-based silicone coating on a silica gel substrate, with a film thickness of 17 μm ± 2 μm, and bake at 100°C for 90 min.

[0050] Example 2:

[0051] The water-based silicone coating of the present embodiment includes the components shown in Table 1 by weight.

[0052] The water-based silicone coating of the present embodiment is prepared by the following method:

[0053] S1, raw material preparation:

[0054] Mix 100 parts of vinyl silicone resin A with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based vinyl silicone resin;

[0055] Mix 70 parts of hydrogen-containing silicone resin B and 30 parts of silicone resin C, then add 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based hydrogen-containing silicone resin.

[0056] Mix 100 parts of catalyst D with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based catalyst.

[0057] S2, add water-based vinyl silicone resin, water-based hydrogen-containing silicone resin, and water-based catalyst to a stirring tank, mix at 400 rpm for 8 min to obtain mixture A;

[0058] S3, add silica filler to mixture A under stirring at 600 rpm, increase the speed to 800 rpm and stir for 20 min to obtain mixture B;

[0059] S4, add wax emulsion to mixture B, disperse at 400 rpm for 10 min to obtain mixture C;

[0060] S5, add deionized water to mixture D, disperse at 600 rpm for 10 min to obtain a water-based silicone coating.

[0061] The water-based silicone coating of the present embodiment can form a coating on the surface of a flexible substrate, which specifically includes the following operations: spray the prepared water-based silicone coating on a silica gel substrate, with a film thickness of 17 μm ± 2 μm, and bake at 100°C for 90 min.

[0062] Example 3:

[0063] The water-based silicone coating of the present embodiment includes the components shown in Table 1 by weight.

[0064] The water-based silicone coating of the present embodiment is prepared by the following method:

[0065] S1, raw material preparation:

[0066] Mix 100 parts of vinyl silicone resin A with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based vinyl silicone resin;

[0067] Mix 70 parts of hydrogen-containing silicone resin B and 30 parts of silicone resin C, dissolve thoroughly, then add 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based hydrogen-containing silicone resin.

[0068] Mix 100 parts of catalyst D with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based catalyst.

[0069] S2, add the water-based vinyl silicone resin, water-based hydrogen-containing silicone resin, and water-based catalyst to a stirring tank, mix at 600 rpm for 5 min to obtain mixture A;

[0070] S3, add silica filler to mixture A under stirring at 400 rpm, increase the speed to 600 rpm and stir for 30 min to obtain mixture B;

[0071] S4, add the wax emulsion to mixture B, disperse at 500 rpm for 10 min to obtain mixture C;

[0072] S5, add deionized water to mixture D to obtain a water-based silicone coating.

[0073] The water-based silicone coating of the present embodiment can form a coating on the surface of a flexible substrate, which comprises the following operations: spray the prepared water-based silicone coating on a silica gel substrate, with a film thickness of 17 μm ± 2 μm, and bake at 100°C for 90 min.

[0074] Example 4:

[0075] The water-based silicone coating of the present embodiment comprises the components shown in Table 1 by weight.

[0076] The water-based silicone coating of the present embodiment is prepared by the following method:

[0077] S1, raw material preparation:

[0078] Mix 100 parts of vinyl silicone resin A with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based vinyl silicone resin;

[0079] Mix 70 parts of hydrogen-containing silicone resin B and 30 parts of silicone resin C, then add 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based hydrogen-containing silicone resin.

[0080] Mix 100 parts of catalyst D with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based catalyst.

[0081] S2, add water-based vinyl silicone resin, water-based hydrogen-containing silicone resin, and water-based catalyst to a stirring tank, mix at 500 rpm for 10 min to obtain mixture A;

[0082] S3, add silica filler to mixture A under stirring at 500 rpm, increase the speed to 700 rpm and stir for 20 min to obtain mixture B;

[0083] S4, add wax emulsion to mixture B, disperse at 500 rpm for 10 min to obtain mixture C;

[0084] S5, add deionized water to mixture D to obtain a water-based silicone coating.

[0085] The water-based silicone coating of the present embodiment can form a coating on the surface of a flexible substrate, which specifically includes the following operations: spray the prepared water-based silicone coating on a silica gel substrate, with a film thickness of 17 μm ± 2 μm, and bake at 100°C for 90 min.

[0086] Example 5:

[0087] The water-based silicone coating of the present embodiment includes the components shown in Table 1 by weight.

[0088] The water-based silicone coating of the present embodiment is prepared by the following method:

[0089] S1, raw material preparation:

[0090] Mix 100 parts of vinyl silicone resin A with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based vinyl silicone resin;

[0091] Mix 70 parts of hydrogen-containing silicone resin B and 30 parts of silicone resin C, then add 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based hydrogen-containing silicone resin.

[0092] Mix 100 parts of catalyst D with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based catalyst.

[0093] S2, add the water-based vinyl silicone resin, water-based hydrogen-containing silicone resin, and water-based catalyst to a stirring tank, mix at 500 rpm for 10 min to obtain mixture A;

[0094] S3, add silica filler to mixture A under stirring at 500 rpm, increase the speed to 700 rpm and stir for 20 min to obtain mixture B;

[0095] S4, add wax emulsion to mixture B, disperse at 500 rpm for 10 min to obtain mixture C;

[0096] S5, add deionized water to mixture D to obtain a water-based silicone coating.

[0097] The water-based silicone coating of the present embodiment can form a coating on the surface of a flexible substrate, which specifically comprises the following operations: spray the prepared water-based silicone coating on a silica gel substrate, with a film thickness of 17 μm ± 2 μm, and bake at 100°C for 90 min.

[0098] Example 6:

[0099] The water-based silicone coating of the present embodiment comprises the components shown in Table 1 by weight.

[0100] The water-based silicone coating of the present embodiment is prepared by the following method:

[0101] S1, raw material preparation:

[0102] Mix 100 parts of vinyl silicone resin A with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based vinyl silicone resin;

[0103] Mix 70 parts of hydrogen-containing silicone resin B and 30 parts of silicone resin C, then add 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based hydrogen-containing silicone resin.

[0104] Mix 100 parts of catalyst D with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix evenly, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based catalyst.

[0105] S2, add water-based vinyl silicone resin, water-based hydrogen-containing silicone resin, and water-based catalyst to a stirring tank, mix at 500 rpm for 10 min to obtain mixture A;

[0106] S3, add silica filler to mixture A under stirring at 500 rpm, increase the speed to 700 rpm and stir for 20 min to obtain mixture B;

[0107] S4, add wax emulsion to mixture B, disperse at 500 rpm for 10 min to obtain mixture C;

[0108] S5, add deionized water to mixture D to obtain a water-based silicone coating.

[0109] The water-based silicone coating of the present embodiment can form a coating on the surface of a flexible substrate, which specifically includes the following operations: spray the prepared water-based silicone coating on a silica gel substrate, with a film thickness of 17 μm ± 2 μm, and bake at 100°C for 90 min.

[0110] Example 7:

[0111] The water-based silicone coating of the present embodiment includes the components shown in Table 1 by weight.

[0112] The water-based silicone coating of the present embodiment is prepared by the following method:

[0113] S1, raw material preparation:

[0114] Mix 100 parts of vinyl silicone resin A with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based vinyl silicone resin;

[0115] Mix 50 parts of hydrogen-containing silicone resin B and 50 parts of silicone resin C, then add 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, mix well, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based hydrogen-containing silicone resin.

[0116] Mix 100 parts of catalyst D with 8 parts of emulsifier fatty alcohol polyoxyethylene ether in a mixer, slowly add 100 parts of water, mix well while adding, after adding water, use a homogenizer to homogenize for 20 min, thereby obtaining a water-based catalyst.

[0117] S2, add water-based vinyl silicone resin, water-based hydrogen-containing silicone resin, and water-based catalyst to a stirring tank, mix at 500 rpm for 10 min to obtain mixture A;

[0118] S3, add silica filler to mixture A under stirring at 500 rpm, increase the speed to 700 rpm and stir for 20 min to obtain mixture B;

[0119] S4, add wax emulsion to mixture B, disperse at 500 rpm for 10 min to obtain mixture C;

[0120] S5, add deionized water to mixture D to obtain a water-based silicone coating.

[0121] The water-based silicone coating of the present embodiment can form a coating on the surface of a flexible substrate, which specifically includes the following operations: spray the prepared water-based silicone coating on a silica gel substrate, with a film thickness of 17 μm ± 2 μm, and bake at 100°C for 90 min.

[0122] Comparative Example 1:

[0123] The silicone coating of the present comparative example differs from Example 1 only in that the molecular weight of vinyl resin A in the present comparative example is 11700 g / mol, and the vinyl content is 0.05%. The component ratio is as shown in Table 1.

[0124] Comparative Example 2:

[0125] The silicone coating of the present comparative example differs from Example 1 only in that the platinum content of catalyst D in the present comparative example is 5000 ppm.

[0126] Table 1. Component ratio of the aqueous silicone coating of each example

[0127]

[0128] The coating formed by the silicone coating of each example and the comparative example on the surface of the silica gel substrate was tested for performance, and the test method is shown as follows:

[0129] The adhesion test was tested according to the GB9286-2021 standard.

[0130] Water boiling test: soak in boiling water (about 100°C) for 120 min, observe the surface of the coating and test the adhesion of the coating.

[0131] Abrasion resistance test: use Taber linear abrasion tester, rubber type CS-10, load 500g, 40 cycles / min for friction test.

[0132] Xenon lamp aging test: select 420nm ultraviolet light, light intensity is 0.80W / m2, after irradiation for a certain time, if the coating surface has no obvious change, it is OK.

[0133] Bending test: spray the silicone coating on the silica gel substrate, the film thickness is 17μm-19μm, and the product is observed whether it has cracking after 180° bending.

[0134] The friction coefficient is determined according to GB / T 10006-2021, the load is 300g, and the traction speed is 100mm / min.

[0135] The test results are shown in Table 2.

[0136] Table 2. Performance test results of the coating formed by each example and the comparative example

[0137]

[0138] Combining Examples 1-7 with Comparative Examples 1 and 2, and Tables 1 and 2, it can be seen that the water-based silicone coating prepared using the present invention exhibits excellent adhesion to silicone substrates. This is because the crosslinking and curing mechanism of the water-based silicone coating is a hydrosilylation reaction, which is fast and thorough, forming a fully crosslinked, flexible coating on the silicone substrate. Furthermore, the coating exhibits excellent compatibility with the silicone substrate, allowing it to adhere to the silicone substrate through intermolecular forces. Furthermore, the large number of methyl groups in the main chain of the water-based silicone resin significantly reduces the surface tension of the coating, imparting excellent hydrophobicity and maintaining good adhesion even after high-temperature water boiling tests. Due to the large number of Si-O-Si bonds in the water-based silicone resin and the relatively long molecular chains of the water-based vinyl silicone resin, the silicone coating exhibits excellent flexibility and self-lubricating properties, resulting in a very low coefficient of friction and a smooth feel. The low polarity and high Si-O-Si bond energy of the water-based silicone coating also provide excellent aging resistance, exhibiting no yellowing after 300 hours of xenon lamp aging testing.

[0139] In combination with Examples 1-3 and Tables 1 and 2, it can be seen that as the proportion of water-based hydrogenated silicone resin in the formula increases, the friction coefficient of the coating decreases and the wear resistance is improved. This is because the water-based hydrogenated silicone resin contains a large number of silicon hydrogen groups that can react with the vinyl group in the water-based vinyl silicone resin. As the number of silicon hydrogen groups increases, the reaction sites in the coating increase, thereby increasing the crosslinking density and strength of the coating, and giving the coating better wear resistance.

[0140] In combination with Examples 1, 4, and 5 and in combination with Tables 1 and 2, it can be seen that as the proportion of the water-based catalyst in the formula increases, the wear resistance of the coating is further improved. This is because the water-based catalyst contains platinum, which can efficiently catalyze the silicon hydrogen groups in the water-based hydrogenated silicone resin to undergo a silylation reaction with the vinyl groups in the water-based vinyl silicone resin. As the proportion of the catalyst increases, the rate of the silylation reaction is further improved, thereby deepening the degree of crosslinking of the coating and enhancing the wear resistance.

[0141] Combining Examples 1, 4, and 5 with Tables 1 and 2 reveals that increasing the proportion of wax emulsion in the water-based organic coating further reduces friction. This is primarily due to the high-density polyethylene microparticles in the wax emulsion, which have an average particle size of less than 1 micron and exhibit excellent self-lubricating and wear-resistant properties. During the crosslinking and curing process, the polyethylene microparticles float on the coating surface, further enhancing the coating's smoothness.

[0142] As can be seen from Examples 1, 7 and Tables 1, 2, the friction coefficient of the coating is further reduced and the wear resistance is improved when the proportion of the silicone resin C in the aqueous hydrogen-containing silicone resin is increased. This is because the silicone resin C has a three-dimensional spherical structure, good compatibility with other silicone resins and contains silicon hydrogen groups that can crosslink with the vinyl silicone resin, so the silicone resin C can reinforce the aqueous silicone coating.

[0143] As can be seen from Examples 1, Comparative Example 1 and Tables 1, 2, the wear resistance and toughness of the coating are further improved as the molecular weight of the vinyl silicone resin A in the aqueous silicone coating formulation is increased. This is because the free rotation and winding ability of the coating during curing is enhanced when the molecular weight is increased, so the intermolecular bonding is more compact.

[0144] As can be seen from Examples 1, Comparative Example 2 and Tables 1, 2, the wear resistance of the coating can be improved as the platinum content of the catalyst D in the aqueous silicone coating is increased. This is because the crosslinking reaction rate of the coating is accelerated when the catalyst concentration is increased, and the resins in the aqueous silicone coating are fully converted into crosslinked materials.

[0145] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above examples. Improvements and changes obtained by those skilled in the art without departing from the technical concept of the present application should also be considered as the protection scope of the present application.

[0146] Although the embodiments of the present application have been shown and described above, it should be understood that the above examples are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A water-based silicone coating, characterized in that: The composition comprises the following components in parts by weight: 100 parts of water-based vinyl silicone resin, 3-20 parts of water-based hydrogenated silicone resin, 3-20 parts of water-based catalyst, 5-20 parts of filler, 3-10 parts of wax emulsion and 50-200 parts of water-based solvent; The water-based vinyl silicone resin comprises silicone resin A and an emulsifier, wherein the main chain structure of silicone resin A is , a and b are the number of chain segments; the molecular weight of the silicone resin A is 50,000 to 1,000,000 g / mol; the water-based hydrogenated silicone resin includes silicone resin B and silicone resin C, and the main chain structure of the silicone resin B is , m and n are the number of chain segments; silicone resin C is a hydrogenated MQ silicone resin with the structural formula [(CH3)2HSiO 1 / 2 ] x [(CH3)3SiO 1 / 2 ] y [SiO 4 / 2 ] z ; The mass of the vinyl group in the silicone resin A is 0.01% to 5% of the total mass of the silicone resin A; the mass content of hydrogen in the silicone resin B is 0.1% to 0.8%; and the mass ratio of the silicone resin B to the silicone resin C is 1:(0.1 to 1.5); The catalyst is a platinum catalyst with a platinum content of 50-10000 ppm.

2. The water-based silicone coating according to claim 1, characterized in that: The filler is a silicon dioxide filler, and the particle size of the filler is 1-10 μm.

3. The water-based silicone coating according to claim 1, characterized in that: The particle size of the wax emulsion is 0.3-20 μm.

4. A method for preparing a water-based organosilicon coating according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, mixing the waterborne vinyl silicone resin, the waterborne hydrogenated silicone resin and the waterborne catalyst to obtain a mixture A; S2, adding the filler to mixture A, and mixing to obtain mixture B; S3, adding the wax emulsion to mixture B, and mixing to obtain mixture C; S4. Add an aqueous solvent to the mixture C and mix well to obtain the water-based silicone coating.

5. The method for preparing a water-based organosilicon coating according to claim 4, wherein: In S1, the mixing speed is 400~600 rpm, and the mixing time is 5~10 min; in S2, the mixing speed is 600~800 rpm, and the mixing time is 20~30 min; in S3, the mixing speed is 400~600 rpm, and the mixing time is 5~10 min; in S4, the mixing speed is 400~600 rpm, and the mixing time is 10~20 min.

6. Use of the water-based organosilicon coating according to any one of claims 1 to 3, characterized in that: The water-based organic silicon coating is used to form a coating on the surface of a flexible substrate.

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