High-weather-resistance composite silicon PU court surface layer and construction method thereof

Abstract

The application relates to the technical field of court surface layers, in particular to a high-weather-resistance composite silicon PU court surface layer and a construction method thereof. The high-weather-resistance composite silicon PU court surface layer comprises, from bottom to top, a waterproof bottom coating layer, a silicon PU material layer, a winter polyurea reinforcing layer and a water-based surface paint layer. The waterproof bottom coating is used as a bottom sealing material, the silicon PU material is used as a bottom layer, the winter polyurea material is used as a reinforcing layer, and the water-based surface paint is used as a color layer, so that a novel court surface layer with good weather resistance, high rebound rate, excellent performance and super-long service life is obtained; the service life of the novel court surface layer is more than 10 years, excellent physical properties are maintained, and defects such as low service life, poor rebound, poor impact absorption, poor wear resistance, easy pulverization, high cost and complex construction of ordinary courts are effectively overcome, and the knee joint safety and body health of athletes are fully protected.

Description

Technical Field

[0001] This invention relates to the field of sports court surface technology, specifically to a high weather-resistant composite silicone PU sports court surface and its construction method. Background Technology

[0002] With the development of national fitness activities, the requirements for sports facilities are constantly increasing. Polyurethane materials have excellent wear resistance, slip resistance, flame retardancy, aging resistance, weather resistance, wide hardness range, suitable elasticity, and excellent shock absorption performance. They are also easy to maintain, have bright and neat colors, and are unaffected by weather conditions. The resulting surfaces are flat and uniform, absorb vibrations, allow for free bounce, and are aesthetically pleasing. They can also reduce the severity of injuries if athletes fall. Therefore, they have become an indispensable part of modern sports facilities. In recent years, sports field products have gradually become more serialized and diversified, and polyurethane court technology is also showing a new trend. The emergence of many new materials is driving the further development of sports fields in my country towards higher performance, lower cost, and greater environmental friendliness and health.

[0003] Silicone PU (SPU) is a healthy and professional elastic sports court material. The SPU surface layer is tough and dense, not easily scratched by shoe soles or other hard objects, providing excellent protection for athletes and effectively preventing potential injuries during exercise. To improve the weather resistance, elasticity, wear resistance, and lifespan of SPU courts, existing SPU courts often use multi-layer composites of different materials. However, due to outdoor environmental factors, prolonged exposure to sunlight and ultraviolet rays can cause many existing SPU courts to experience fading, chalking, exudation, and cracking of the surface layer. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a high weather-resistant composite silicone PU sports court surface layer with good weather resistance, good physical properties, high resilience, long service life, and simple construction.

[0005] Another objective of this invention is to provide a construction method for a high weather-resistant composite silicone PU sports court surface layer, which is simple and easy to implement.

[0006] This invention is achieved using the following technical solution:

[0007] The high weather-resistant composite silicone PU court surface layer includes, from bottom to top, a waterproof base layer, a silicone PU material layer, an aspartic polyurea reinforcing layer, and a water-based topcoat layer;

[0008] The silicone PU material layer consists of the following raw materials by weight percentage plus 3% leveling and curing agent:

[0009] Polyether polyol A: 5-7%

[0010] Polyether polyol B: 7-9%

[0011] Polyether polyol C: 5-7%

[0012] Long-chain chlorinated paraffins: 4-6%

[0013] DOTP: 4-6%

[0014] Diphenylmethane diisocyanate: 8-10%

[0015] Magnesium oxide: 2-4%

[0016] Filler: 40-45%

[0017] Kaolin: 6-8%

[0018] Light stabilizer: 0.2-0.5%

[0019] Antioxidant: 0.2-0.5%

[0020] Defoamer: 0.1-0.3%;

[0021] Dispersant: 0.1-0.3%

[0022] Catalyst: 0.01-0.1%

[0023] Dimethyl carbonate: 6-8%;

[0024] The leveling and curing agent is composed of the following raw materials in weight percentages:

[0025] Polyether polyol D: 25-30%

[0026] Polyether polyol E: 30-35%

[0027] Chain extender: 40-45%;

[0028] The aspartic polyurea reinforcing layer is a two-component product consisting of component A and component B in a mass ratio of 1:2, wherein component A is composed of the following raw materials by mass percentage:

[0029] Asparagus Resin A: 40-45%

[0030] Defoamer: 0.1-0.3%

[0031] Dispersant: 0.3-0.5%

[0032] Anti-settling agent: 0.3-0.5%

[0033] Barium sulfate: 40-45%

[0034] Molecular sieve: 5-10%

[0035] Light stabilizer: 0.2-0.5%

[0036] Antioxidant: 0.2-0.5%

[0037] Pigment: 5-10%.

[0038] Component B is composed of the following raw materials by mass percentage:

[0039] Polyether polyol B: 25-30%

[0040] Polyether polyol C: 40-45%

[0041] DOTP: 10-15%

[0042] Toluene diisocyanate: 10-15%

[0043] Dimethyl carbonate: 3-5%

[0044] Defoamer: 0.1-0.3%.

[0045] The waterproof primer coating is composed of the following raw materials in weight percentages, plus 0.03-0.05% defoamer and 0.1% catalyst:

[0046] Polyether polyol A: 15-20%

[0047] Trimethylolpropane: 2-3%

[0048] Diphenylmethane diisocyanate: 25-30%

[0049] Dimethyl carbonate: 35-40%

[0050] Propylene carbonate: 10-15%.

[0051] The water-based topcoat layer is composed of water-based polyurethane emulsion and HDI curing agent in a mass ratio of 13.5-15:1.

[0052] The polyether polyol A has a functionality of 2 and a hydroxyl value of 109-115 mgKOH / g, preferably DDL-1000D; the polyether polyol B has a functionality of 2 and a hydroxyl value of 54.5-57.5 mgKOH / g, preferably C2020; the polyether polyol C has a functionality of 3 and a hydroxyl value of 32.5-35.5 mgKOH / g, preferably DEP-330N; the polyether polyol D has a functionality of 4 and a hydroxyl value of 747.5-748.5 mgKOH / g, preferably T-403; the polyether polyol E has a functionality of 3 and a hydroxyl value of 336-337 mgKOH / g, preferably MN-500; and the chain extender is WANALINK6200.

[0053] The asparagus resin A has a functionality of 2 and an amine value of 190, preferably F420.

[0054] The filler is 400-mesh talc powder; the anti-settling agent is organic bentonite; the light stabilizer is UV-326; the antioxidant is 1010; the defoamer is organic silicone oil; the catalyst is dibutyltin dilaurate; and the dispersant is 7456F.

[0055] The construction method for the high weather-resistant composite silicone PU sports court surface layer includes the following steps:

[0056] (1) Apply a waterproof primer to the foundation of the site, with a thickness of 0.2-0.5mm;

[0057] (2) After the waterproof primer has cured, apply a layer of silicone PU material to the surface of the waterproof primer. The thickness of the layer is 4-6 mm, and it will cure in 20-24 hours.

[0058] (3) After the silicone PU material layer has cured, mix the A and B components of the aspartic polyurea reinforcement layer evenly, and apply the aspartic polyurea reinforcement layer to the surface of the silicone PU material layer with a thickness of 2-4 mm. Curing time is 20-24 hours.

[0059] (4) After the aspartic polyurea reinforcement layer has cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly, and spray or roll the water-based topcoat layer on the surface of the aspartic polyurea reinforcement layer with a thickness of 400-600μm.

[0060] When applying the aspartic polyurea reinforcement layer, the amount of aspartic polyurea reinforcement layer material used is 1.1-1.5 kg per square meter of 1 mm thickness.

[0061] The preferred waterborne polyurethane emulsion is 1602, and the preferred HDI curing agent is 72-100.

[0062] The sports court surface of this invention employs a composite surface structure consisting of a waterproof primer, silicone PU material, an aspartic polyurea reinforcing layer, and a water-based topcoat. The waterproof primer serves as a sealing material; firstly, its permeability reinforces the foundation, and secondly, it forms a good film, sealing against moisture leakage and ensuring basic construction conditions for the court, laying a solid foundation for subsequent construction. The silicone PU material acts as the base layer, providing support and good resilience due to its excellent flexibility and elasticity. An aspartic polyurea reinforcing layer is applied over the silicone PU material, providing weather resistance, improving the physical properties of the sports court material, and offering anti-aging, high wear resistance, and high resilience. Finally, various colored water-based topcoats are applied to the surface of the aspartic polyurea reinforcing layer according to process requirements.

[0063] The high weather-resistant composite silicone PU sports surface layer of the present invention has a resilience rate of ≥50%, tensile strength of ≥2MPa, elongation at break of ≥150%, and impact absorption of ≥35%. It can still maintain the above properties after 1500 hours of accelerated aging in artificial climate.

[0064] Compared with the prior art, the beneficial effects of the present invention are:

[0065] (1) This invention uses a waterproof primer as the sealing material, a silicone PU material as the bottom layer, an aspartic polyurea material as the reinforcing layer, and a water-based topcoat as the color layer to obtain a new type of court surface with good weather resistance, high rebound rate, excellent performance and long service life. Its service life exceeds 10 years, while maintaining excellent physical properties. It effectively overcomes the defects of ordinary courts such as low service life, poor rebound, poor impact absorption, poor wear resistance, easy powdering, high cost and complicated construction, and fully protects the knee joint safety and physical health of athletes.

[0066] (2) In this invention, different polyether polyols are selected for compounding and synergistic effects with other additives. The performance indicators of the high-elasticity composite silicone PU court surface obtained by construction fully meet the standard of GB36246-2018, with a rebound rate ≥50%, tensile strength ≥2MPa, elongation at break ≥150%, and impact absorption ≥35%.

[0067] (3) The aspartic polyurea reinforcing layer made in this invention utilizes the structural characteristics of aspartic resin and uses low free TDI prepolymer as curing agent. The resulting reinforcing layer has good weather resistance and improves the problem of short operation time of aspartic polyurea. It is easy to construct and can be completely cured within 24 hours. After 1500 hours of accelerated aging in artificial climate, its rebound rate is ≥50%, tensile strength is ≥2MPa, elongation at break is ≥150%, and impact absorption is ≥35%. Detailed Implementation

[0068] To make the objectives and technical solutions of this invention clearer, the invention will be further described in detail below.

[0069] DDL-1000D, manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.

[0070] C2020, manufactured by Wanhua Chemical Group Co., Ltd.

[0071] DEP-330N is manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.

[0072] T-403, manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.

[0073] MN-500 is manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.

[0074] WANALINK6200 is manufactured by Wanhua Chemical Group Co., Ltd.

[0075] F420, manufactured by Shenzhen Feiyang Technology Co., Ltd.

[0076] 1601, manufactured by Guangzhou Kangdifu Environmental Protection Technology Co., Ltd.

[0077] 1602, manufactured by Guangzhou Kangdifu Environmental Protection Technology Co., Ltd.

[0078] 72-100, manufactured by Guangzhou Kangdifu Environmental Protection Technology Co., Ltd.

[0079] 655, manufactured by Guangzhou Kangdifu Environmental Protection Technology Co., Ltd.

[0080] 7456F, manufactured by Guangzhou Sloco New Materials Co., Ltd.

[0081] DL-2000 is manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.

[0082] MN-3050 is manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.

[0083] In the following examples and comparative examples:

[0084] The filler is 400-mesh talc powder; the anti-settling agent is organic bentonite; the light stabilizer is UV-326; the antioxidant is 1010; the defoamer is organic silicone oil; the catalyst is dibutyltin dilaurate; and the dispersant is 7456F.

[0085] Example 1

[0086] The high weather-resistant composite silicone PU court surface consists of, from bottom to top, a 0.5mm waterproof base layer, a 6mm silicone PU material layer, a 2mm aspartic polyurea reinforcing layer, and a 400μm water-based topcoat layer.

[0087] The silicone PU material layer consists of the following raw materials by weight percentage plus 3% leveling and curing agent:

[0088] DDL-1000D: 6%

[0089] C2020: 8%

[0090] DEP-330N: 6%

[0091] 52# Long-chain Chlorinated Paraffin 5%

[0092] DOTP: 5%

[0093] Diphenylmethane diisocyanate: 10%

[0094] Magnesium oxide: 2%

[0095] Filler: 43.99%

[0096] Kaolin: 6%

[0097] Light stabilizer: 0.2%

[0098] Antioxidant: 0.2%

[0099] Defoamer: 0.1%;

[0100] Dispersant: 0.1%

[0101] Catalyst: 0.01%

[0102] Dimethyl carbonate: 7.4%;

[0103] The leveling and curing agent is composed of the following raw materials in weight percentages:

[0104] T-403: 25%

[0105] MN500: 35%

[0106] WANALINK6200: 40%.

[0107] The aspartic polyurea reinforcing layer is a two-component product with a mass ratio of 1:2. Component A consists of the following raw materials by mass percentage:

[0108] F420: 40%

[0109] Defoamer: 0.1%

[0110] Dispersant: 0.3%

[0111] Anti-settling agent: 0.3%

[0112] Barium sulfate: 45%

[0113] Molecular sieve: 5%

[0114] Light stabilizer: 0.2%

[0115] Antioxidant: 0.2%

[0116] Pigment content: 8.9%.

[0117] Component B consists of the following raw materials by mass percentage:

[0118] DDL-1000D: 25%

[0119] DEP-330N: 45%

[0120] DOTP: 10%

[0121] Toluene diisocyanate: 15%

[0122] Dimethyl carbonate: 4.7%

[0123] Defoamer: 0.3%.

[0124] The waterproof primer coating consists of the following raw materials in weight percentages, plus 0.03% silicone oil and 0.1% dibutyltin dilaurate:

[0125] Polyether polyol A: 20%

[0126] Trimethylolpropane: 2%

[0127] Diphenylmethane diisocyanate: 30%

[0128] Dimethyl carbonate: 35%

[0129] Propylene carbonate: 13%.

[0130] The water-based topcoat layer is composed of 1602 and 72-100 in a mass ratio of 15:1.

[0131] The construction method is as follows:

[0132] (1) First, prepare the site foundation. The foundation must be firm and flat (flatness requirement: error of 3m straightedge not greater than 3mm), with a certain drainage slope, and the strength must reach the standard C25 strength of building concrete. After pouring, water retention and curing should be maintained for no less than 7 days, and the overall curing period should be no less than 28 days. Before construction, the site moisture should be verified. Construction is prohibited when the moisture content is too high. The acidity and alkalinity should meet the requirements. Then, roll on the waterproof primer with a thickness of 0.5mm.

[0133] (2) After the waterproof primer has cured, apply a layer of silicone PU material to the surface of the waterproof primer. The thickness of the layer is 6 mm. Let it cure for 24 hours.

[0134] (3) After the silicone PU material layer has cured, mix the A and B components of the aspartic polyurea reinforcement layer evenly, and apply the aspartic polyurea reinforcement layer to the surface of the silicone PU material layer. Use 1.1 kg per square meter of 1 mm thickness, with a thickness of 2 mm, and cure for 24 hours.

[0135] (4) After the aspartic polyurea reinforcing layer has cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly, and roll the water-based topcoat layer on the surface of the aspartic polyurea reinforcing layer with a thickness of 400μm.

[0136] Example 2

[0137] A high weather-resistant composite silicone PU sports court surface layer consists of, from bottom to top, a 0.5mm waterproof base layer, a 4mm silicone PU material layer, a 4mm aspartic polyurea reinforcing layer, and a 400μm water-based topcoat layer.

[0138] The silicone PU material layer consists of the following raw materials by weight percentage plus 3% leveling and curing agent:

[0139] DDL-1000D: 5%

[0140] C2020: 9%

[0141] DEP-330N: 5%

[0142] 52# Long-chain chlorinated paraffin: 6%

[0143] DOTP: 4%

[0144] Diphenylmethane diisocyanate: 9%

[0145] Magnesium oxide: 3%

[0146] Filler: 43.65%

[0147] Kaolin: 7%

[0148] Light stabilizer: 0.5%

[0149] Antioxidant: 0.3%

[0150] Defoamer: 0.3%;

[0151] Dispersant: 0.2%

[0152] Catalyst: 0.05%

[0153] Dimethyl carbonate: 7%.

[0154] The leveling and curing agent is composed of the following raw materials in weight percentages:

[0155] T-403: 26%

[0156] MN500: 35%

[0157] WANALINK6200: 39%.

[0158] The aspartic polyurea reinforcing layer is a two-component product with a mass ratio of 1:2. Component A consists of the following raw materials by mass percentage:

[0159] F420: 42%

[0160] Defoamer: 0.2%

[0161] Dispersant: 0.3%

[0162] Anti-settling agent: 0.5%

[0163] Barium sulfate: 43%

[0164] Molecular sieve: 5%

[0165] Light stabilizer: 0.5%

[0166] Antioxidant: 0.5%

[0167] Pigment: 8%.

[0168] Component B consists of the following raw materials by mass percentage:

[0169] DDL-1000D: 30%

[0170] DEP-330N: 40%

[0171] DOTP: 10%

[0172] Toluene diisocyanate: 15%

[0173] Dimethyl carbonate: 4.7%

[0174] Defoamer: 0.3%.

[0175] The waterproof primer coating consists of the following raw materials in weight percentages, plus 0.05% silicone oil and 0.1% dibutyltin dilaurate:

[0176] Polyether polyol A: 18%

[0177] Trimethylolpropane: 2%

[0178] Diphenylmethane diisocyanate: 30%

[0179] Dimethyl carbonate: 35%

[0180] Propylene carbonate: 15%.

[0181] The water-based topcoat layer is composed of 1602 and 72-100 in a mass ratio of 15:1.

[0182] The construction method is as follows:

[0183] (1) First, prepare the site foundation. The foundation must be firm and flat (flatness requirement: error of 3m straightedge not greater than 3mm), with a certain drainage slope, and the strength must reach the standard C25 strength of building concrete. After pouring, water retention and curing should be maintained for no less than 7 days, and the overall curing period should be no less than 28 days. Before construction, the site moisture should be verified. Construction is prohibited when the moisture content is too high. The acidity and alkalinity should meet the requirements. Then, roll on the waterproof primer with a thickness of 0.5mm.

[0184] (2) After the waterproof primer has cured, apply a layer of silicone PU material to the surface of the waterproof primer. The thickness of the layer is 4 mm. Let it cure for 24 hours.

[0185] (3) After the silicone PU material layer has cured, mix the A and B components of the aspartic polyurea reinforcement layer evenly, and apply the aspartic polyurea reinforcement layer to the surface of the silicone PU material layer. Use 1.1 kg per square meter of 1 mm thickness, with a thickness of 4 mm, and cure for 24 hours.

[0186] (4) After the aspartic polyurea reinforcing layer has cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly, and spray the water-based topcoat layer on the surface of the aspartic polyurea reinforcing layer with a thickness of 400μm.

[0187] Example 3

[0188] A high weather-resistant composite silicone PU sports court surface layer consists of, from bottom to top, a 0.5mm waterproof base layer, a 5mm silicone PU material layer, a 3mm aspartic polyurea reinforcing layer, and a 400μm water-based topcoat layer.

[0189] The silicone PU material layer consists of the following raw materials by weight percentage plus 3% leveling and curing agent:

[0190] DDL-1000D: 7%

[0191] C2020: 8%

[0192] DEP-330N: 7%

[0193] 52# Long-chain chlorinated paraffin: 4%

[0194] DOTP: 6%

[0195] Diphenylmethane diisocyanate: 9%

[0196] Magnesium oxide: 2%

[0197] Filler: 40%

[0198] Kaolin: 8%

[0199] Light stabilizer: 0.2%

[0200] Antioxidant: 0.2%

[0201] Defoamer: 0.3%;

[0202] Dispersant: 0.2%

[0203] Catalyst: 0.1%

[0204] Dimethyl carbonate: 8%.

[0205] The leveling and curing agent is composed of the following raw materials in weight percentages:

[0206] T-403: 27%

[0207] MN500: 34%

[0208] WANALINK6200: 39%.

[0209] The aspartic polyurea reinforcing layer is a two-component product with a mass ratio of 1:2. Component A consists of the following raw materials by mass percentage:

[0210] F420: 45%

[0211] Defoamer: 0.1%

[0212] Dispersant: 0.3%

[0213] Anti-settling agent: 0.3%

[0214] Barium sulfate: 40%

[0215] Molecular sieve: 5%

[0216] Light stabilizer: 0.2%

[0217] Antioxidant: 0.2%

[0218] Pigment content: 8.9%.

[0219] Component B consists of the following raw materials by mass percentage:

[0220] DDL-1000D: 28%

[0221] DEP-330N: 40%

[0222] DOTP: 15%

[0223] Toluene diisocyanate: 12%

[0224] Dimethyl carbonate: 4.7%

[0225] Defoamer: 0.3%.

[0226] The waterproof primer coating consists of the following raw materials in weight percentages, plus 0.04% silicone oil and 0.1% dibutyltin dilaurate:

[0227] Polyether polyol A: 18%

[0228] Trimethylolpropane: 2.5%

[0229] Diphenylmethane diisocyanate: 29%

[0230] Dimethyl carbonate: 37.5%

[0231] Propylene carbonate: 13%.

[0232] The water-based topcoat layer is composed of 1602 and 72-100 in a mass ratio of 15:1.

[0233] The construction method is as follows:

[0234] (1) First, prepare the site foundation. The foundation must be firm and flat (flatness requirement: error of 3m straightedge not greater than 3mm), with a certain drainage slope, and the strength must reach the standard C25 strength of building concrete. After pouring, water retention and curing should be maintained for no less than 7 days, and the overall curing period should be no less than 28 days. Before construction, the site moisture should be verified. Construction is prohibited when the moisture content is too high. The acidity and alkalinity should meet the requirements. Then, roll on the waterproof primer with a thickness of 0.5mm.

[0235] (2) After the waterproof primer has cured, apply a layer of silicone PU material to the surface of the waterproof primer. The thickness of the layer is 5 mm. Let it cure for 24 hours.

[0236] (3) After the silicone PU material layer has cured, mix the A and B components of the aspartic polyurea reinforcement layer evenly, and apply the aspartic polyurea reinforcement layer to the surface of the silicone PU material layer. Use 1.1 kg per square meter of 1 mm thickness, with a thickness of 3 mm, and cure for 24 hours.

[0237] (4) After the aspartic polyurea reinforcing layer has cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly, and roll the water-based topcoat layer on the surface of the aspartic polyurea reinforcing layer with a thickness of 400μm.

[0238] Comparative Example 1

[0239] A high wear-resistant composite silicone PU sports court surface layer consists of, from bottom to top, a 0.2mm waterproof base layer, a 6mm silicone PU material layer, a 2mm polyurethane self-leveling layer, and a 200μm water-based topcoat layer.

[0240] The silicone PU material layer is composed of the following raw materials in the indicated mass percentages, plus 0.01% dibutyltin dilaurate:

[0241] DL-2000: 22.5%

[0242] DL-1000: 1%

[0243] EP-330N: 4.8%

[0244] Chlorinated palm oil: 7.5%

[0245] DOTP: 7.5%

[0246] Diphenylmethane diisocyanate: 10%

[0247] Magnesium oxide: 5%

[0248] 400 mesh talc: 40%

[0249] Organic bentonite: 0.5%

[0250] UV-326: 0.5%

[0251] 1010: 0.5%

[0252] Organosilicon oil: 0.2%.

[0253] The polyurethane self-leveling layer is composed of component A and component B mixed in a mass ratio of 1.5:1. Component A consists of the following raw materials in the indicated mass percentages plus 0.03% silicone oil. The curing crosslinking agent is a mixture of organozinc and organobismuth in a mass ratio of 3:1:

[0254] MN-3050: 10%

[0255] EP-330N: 65%

[0256] MOCA: 19.5%

[0257] DOTP: 5%

[0258] Curing crosslinking agent: 0.5%.

[0259] Component B consists of the following raw materials in the indicated mass percentages plus 0.03% silicone oil:

[0260] DL-2000: 58.4%

[0261] 35% diphenylmethane diisocyanate

[0262] DOTP: 6.6%.

[0263] The waterproof primer consists of the following raw materials in the indicated weight percentages plus 0.03% silicone oil:

[0264] DL-1000: 12.2%

[0265] Trimethylolpropane: 2%

[0266] Diphenylmethane diisocyanate: 22.8%

[0267] Dimethyl carbonate: 49%

[0268] Butyl acetate: 14%.

[0269] The water-based topcoat layer is composed of 1601 and 655 in a mass ratio of 15:1.

[0270] The construction method is as follows:

[0271] (1) First, prepare the site foundation to ensure that the hardness, humidity, strength and acidity of the site foundation meet the requirements, and then roll on the waterproof primer with a thickness of 0.2mm;

[0272] (2) After the waterproof primer has cured, apply a layer of silicone PU material to the surface of the waterproof primer. The thickness of the layer is 6 mm. Let it cure for 24 hours.

[0273] (3) After the silicone PU material layer has cured, mix components A and B of the polyurethane self-leveling layer evenly, and apply the polyurethane self-leveling layer to the surface of the silicone PU material layer. Use 1.35 kg per square meter with a thickness of 2 mm, and cure for 24 hours.

[0274] (4) After the polyurethane self-leveling layer has cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly, and roll the water-based topcoat layer on the surface of the silicone PU material layer with a thickness of 200μm.

[0275] Comparative Example 2

[0276] A high-elastic composite silicone PU sports court surface layer consists of, from bottom to top, a 0.2mm waterproof base layer, a 6mm foamed plastic material layer, a 2mm silicone PU material layer, and a 200μm water-based topcoat layer.

[0277] The foamed plastic material layer is composed of component A and component B in a mass ratio of 5:1, plus 0.5% curing agent of the total mass of components A and B. The curing agent is a mixture of organic zinc and organic bismuth in a mass ratio of 4:1. Component A consists of the following raw materials in the following mass percentages:

[0278] MN-3050: 11%

[0279] 45# Paraffin: 20%

[0280] Chlorinated palm oil: 11.5%

[0281] MOCA: 2.1%

[0282] Iron oxide green: 0.3%

[0283] 400 mesh talc: 54%

[0284] Organic bentonite: 0.5%

[0285] UV-326: 0.3%

[0286] 1010: 0.3%.

[0287] Component B consists of the following raw materials by mass percentage:

[0288] MN-3050: 13.6%

[0289] DL-2000: 54.2%

[0290] MDI-50: 32.2%.

[0291] The silicone PU material layer is composed of the following raw materials in the indicated mass percentages, plus 0.01% dibutyltin dilaurate:

[0292] DL-2000: 24%

[0293] DL-1000: 0.8%

[0294] EP-330N: 4.7%

[0295] Chlorinated palm oil: 7.5%

[0296] DOTP: 7.5%

[0297] Diphenylmethane diisocyanate: 10%

[0298] Magnesium oxide: 4.7%

[0299] 400 mesh talc: 40%

[0300] Organic bentonite: 0.3%

[0301] UV-326: 0.2%

[0302] 1010: 0.2%

[0303] Organosilicon oil: 0.1%.

[0304] The waterproof primer consists of the following raw materials in the indicated weight percentages plus 0.03% silicone oil:

[0305] DL-1000: 12%

[0306] Trimethylolpropane: 2%

[0307] Diphenylmethane diisocyanate: 23%

[0308] Dimethyl carbonate: 49%

[0309] Butyl acetate: 14%.

[0310] The water-based topcoat layer is composed of 1601 and 655 in a mass ratio of 15:1.

[0311] The construction method is as follows:

[0312] (1) First, prepare the site foundation to ensure that the hardness, humidity, strength and acidity of the site foundation meet the requirements, and then roll on the waterproof primer with a thickness of 0.2mm;

[0313] (2) After the waterproof primer has cured, mix components A and B of the foamed plastic material layer evenly, add curing agent and stir well. Apply the foamed plastic material layer to the surface of the waterproof primer layer. The amount of application is 1.2 kg per square meter of 1 mm thickness, and the thickness is 6 mm. It is formed in one step, and it is surface dry in 12 hours and cured in 24 hours.

[0314] (3) After the foamed plastic material layer has cured, apply a silicone PU material layer to its surface with a thickness of 2 mm and cure for 24 hours;

[0315] (4) After the silicone PU material layer has cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly, and spray the water-based topcoat layer on the surface of the silicone PU material layer with a thickness of 200μm.

[0316] Comparative Example 3

[0317] A high weather-resistant composite silicone PU sports court surface layer consists of, from bottom to top, a 0.15mm waterproof base layer, a 3mm silicone PU material layer, a 5mm aspartic polyurea reinforcing layer, and a 400μm water-based topcoat layer.

[0318] The silicone PU material layer is composed of the following raw materials in the following mass percentages plus 3% dibutyltin dilaurate:

[0319] DDL-1000D: 6%

[0320] C2020: 8%

[0321] DEP-330N: 6%

[0322] 52# Long-chain chlorinated paraffin: 5%

[0323] DOTP: 5%

[0324] Diphenylmethane diisocyanate: 10%

[0325] Magnesium oxide: 2%

[0326] Filler: 35%

[0327] Kaolin: 5%

[0328] Light stabilizer: 0.2%

[0329] Antioxidant: 0.2%

[0330] Defoamer: 0.1%;

[0331] Dispersant: 0.1%

[0332] Catalyst: 0.01%

[0333] Dimethyl carbonate: 7.4%.

[0334] The aspartic polyurea reinforcing layer is a two-component product with a mass ratio of 1:2. Component A consists of the following raw materials by mass percentage:

[0335] F420: 40%

[0336] Defoamer: 0.1%

[0337] Dispersant: 0.3%

[0338] Anti-settling agent: 0.3%

[0339] Barium sulfate: 45%

[0340] Molecular sieve: 5%

[0341] Light stabilizer: 0.2%

[0342] Antioxidant: 0.2%

[0343] Pigment content: 8.9%.

[0344] Component B consists of the following raw materials by mass percentage:

[0345] DDL-1000D: 25%

[0346] DEP-330N: 45%

[0347] DOTP: 10%

[0348] Toluene diisocyanate: 15%

[0349] Dimethyl carbonate: 4.7%

[0350] Defoamer: 0.3%.

[0351] The waterproof primer coating consists of the following raw materials in weight percentages, plus 0.03% silicone oil and 0.1% dibutyltin dilaurate:

[0352] Polyether polyol A: 20%

[0353] Trimethylolpropane: 2%

[0354] Diphenylmethane diisocyanate: 30%

[0355] Dimethyl carbonate: 35%

[0356] Propylene carbonate: 13%.

[0357] The water-based topcoat layer is composed of 1602 and 72-100 in a mass ratio of 15:1.

[0358] The construction method is as follows:

[0359] (1) First, prepare the site foundation. The foundation must be firm and flat (flatness requirement: error of 3m straightedge not greater than 3mm), with a certain drainage slope, and the strength must reach the standard C25 strength of building concrete. After pouring, keep it moist for no less than 7 days and the overall curing period should be no less than 28 days. Before construction, the site moisture should be verified. Construction is prohibited when the moisture is too high. The acidity and alkalinity must meet the requirements. Then roll on the waterproof primer with a thickness of 0.15mm.

[0360] (2) After the waterproof primer has cured, apply a layer of silicone PU material to the surface of the waterproof primer. The thickness of the layer is 3 mm. Let it cure for 24 hours.

[0361] (3) After the silicone PU material layer has cured, mix the A and B components of the aspartic polyurea reinforcement layer evenly, and apply the aspartic polyurea reinforcement layer to the surface of the silicone PU material layer. Use 1.1 kg per square meter of 1 mm thickness, with a thickness of 5 mm, and cure for 24 hours.

[0362] (4) After the aspartic polyurea reinforcing layer has cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly, and roll the water-based topcoat layer on the surface of the aspartic polyurea reinforcing layer with a thickness of 400μm.

[0363] Comparative Example 4

[0364] A high weather-resistant composite silicone PU sports court surface layer consists of, from bottom to top, a 0.15mm waterproof base layer, a 7mm silicone PU material layer, a 1mm aspartic polyurea reinforcing layer, and a 400μm water-based topcoat layer.

[0365] The silicone PU material layer is composed of the following raw materials in the following mass percentages plus 3% dibutyltin dilaurate:

[0366] DDL-1000D: 6%

[0367] C2020: 8%

[0368] DEP-330N: 6%

[0369] 52# Long-chain chlorinated paraffin: 5%

[0370] DOTP: 5%

[0371] Diphenylmethane diisocyanate: 10%

[0372] Magnesium oxide: 2%

[0373] Filler: 35%

[0374] Kaolin: 5%

[0375] Light stabilizer: 0.2%

[0376] Antioxidant: 0.2%

[0377] Defoamer: 0.1%;

[0378] Dispersant: 0.1%

[0379] Catalyst: 0.01%

[0380] Dimethyl carbonate: 7.4%.

[0381] The aspartic polyurea reinforcing layer is a two-component product with a mass ratio of 1:2. Component A consists of the following raw materials by mass percentage:

[0382] F420: 40%

[0383] Defoamer: 0.1%

[0384] Dispersant: 0.3%

[0385] Anti-settling agent: 0.3%

[0386] Barium sulfate: 45%

[0387] Molecular sieve: 5%

[0388] Light stabilizer: 0.2%

[0389] Antioxidant: 0.2%

[0390] Pigment content: 8.9%.

[0391] Component B consists of the following raw materials by mass percentage:

[0392] DDL-1000D: 25%

[0393] DEP-330N: 45%

[0394] DOTP: 10%

[0395] Toluene diisocyanate: 15%

[0396] Dimethyl carbonate: 4.7%

[0397] Defoamer: 0.3%.

[0398] The waterproof primer coating consists of the following raw materials in weight percentages, plus 0.05% silicone oil and 0.1% dibutyltin dilaurate:

[0399] Polyether polyol A: 20%

[0400] Trimethylolpropane: 2%

[0401] Diphenylmethane diisocyanate: 30%

[0402] Dimethyl carbonate: 35%

[0403] Propylene carbonate: 13%.

[0404] The water-based topcoat layer is composed of 1602 and 72-100 in a mass ratio of 15:1.

[0405] The construction method is as follows:

[0406] (1) First, prepare the site foundation. The foundation must be firm and flat (flatness requirement: error of 3m straightedge not greater than 3mm), with a certain drainage slope, and the strength must reach the standard C25 strength of building concrete. After pouring, keep it moist for no less than 7 days and the overall curing period should be no less than 28 days. Before construction, the site moisture should be verified. Construction is prohibited when the moisture is too high. The acidity and alkalinity must meet the requirements. Then roll on the waterproof primer with a thickness of 0.15mm.

[0407] (2) After the waterproof primer has cured, apply a layer of silicone PU material to the surface of the waterproof primer. The thickness of the layer is 7 mm. Let it cure for 24 hours.

[0408] (3) After the silicone PU material layer is cured, mix the A and B components of the aspartic polyurea reinforcement layer evenly, and apply the aspartic polyurea reinforcement layer to the surface of the silicone PU material layer. Use 1.1 kg per square meter of 1 mm thickness, and cure for 24 hours.

[0409] (4) After the aspartic polyurea reinforcing layer has cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly, and spray the water-based topcoat layer on the surface of the aspartic polyurea reinforcing layer with a thickness of 400μm.

[0410] The performance of the court surface layer obtained from the construction of Examples 1-3 was tested in accordance with GB36246-2018, and the test results are shown in Table 1.

[0411] Table 2 shows the performance test results of the court surface layer obtained by construction in Examples 1-3 after 1500 hours of artificially accelerated climate aging.

[0412] Table 3 shows the performance test results of the court surface layer obtained from the construction of Examples 1-4.

[0413] Table 4 shows the performance test results of the court surface layer obtained by the construction of Examples 1-4 after 1500 hours of artificially accelerated climate aging.

[0414] Table 1. Performance test results of the sports field surface layer obtained from Examples 1-3

[0415]

[0416] Table 2 shows the performance test results of the sports field surface layers obtained from Examples 1-3 after 1500 hours of artificially accelerated climate aging.

[0417]

[0418] Table 3. Performance test results of the court surface layer obtained from Example 1 and Comparative Examples 1-4.

[0419]

[0420] Table 4. Performance test results of the court surface layer obtained from Example 1 and Comparative Examples 1-4 after 1500 hours of artificially accelerated climate aging.

[0421]

[0422] According to the table above, Example 1 and Comparative Examples 1-2 demonstrate the difference in weather resistance between the present invention and other court surface layers. The data in Comparative Examples 1-2 show that physical properties are severely affected during artificially accelerated aging, while the court surface layer described in the present invention is less affected, greatly extending the service life of the court surface layer.

[0423] Example 1 and Comparative Examples 3-4 illustrate a comparison of the thickness of each structural layer. In Comparative Example 3, the silicone PU material layer is 3mm thick, and the aspartic polyurea reinforcement layer is 5mm thick. Due to the relatively thin silicone PU material layer and the relatively thick aspartic polyurea reinforcement layer, the overall court surface has poor resilience and low impact absorption, resulting in poor protection for athletes during use. In Comparative Example 4, the silicone PU material layer is 7mm thick, and the aspartic polyurea reinforcement layer is 1mm thick. Due to the relatively thick silicone PU material layer and the relatively thin aspartic polyurea reinforcement layer, the court surface has insufficient weather resistance and poor strength. This significantly impacts performance during artificially accelerated aging, thus affecting the service life of the court surface.

Claims

1. A high weather-resistant composite silicone PU sports court surface layer, characterized in that, It includes, from bottom to top, a waterproof base coating, a silicone PU material layer, an aspartic polyurea reinforcing layer, and a water-based topcoat layer; The silicone PU material layer consists of the following raw materials by weight percentage plus 3% leveling and curing agent: Polyether polyol A: 5-7% Polyether polyol B: 7-9% Polyether polyol C: 5-7% 52# Chlorinated Paraffin: 4-6% DOTP: 4-6% Diphenylmethane diisocyanate: 8-10% Magnesium oxide: 2-4% Filler: 40-45% Kaolin: 6-8% Light stabilizer: 0.2-0.5% Antioxidant: 0.2-0.5% Defoamer: 0.1-0.3% Dispersant: 0.1-0.3% Catalyst: 0.01-0.1% Dimethyl carbonate: 6-8%; The leveling and curing agent is composed of the following raw materials in weight percentages: Polyether polyol D: 25-30% Polyether polyol E: 30-35% Chain extender: 40-45%; The aspartic polyurea reinforcing layer is a two-component product consisting of component A and component B in a mass ratio of 1:2, wherein component A is composed of the following raw materials by mass percentage: Asparagus Resin A: 40-45% Defoamer: 0.1-0.3% Dispersant: 0.3-0.5% Anti-settling agent: 0.3-0.5% Barium sulfate: 40-45% Molecular sieve: 5-10% Light stabilizer: 0.2-0.5% Antioxidant: 0.2-0.5% Pigment: 5-10%; Component B is composed of the following raw materials by mass percentage: Polyether polyol B: 25-30% Polyether polyol C: 40-45% DOTP: 10-15% Toluene diisocyanate: 10-15% Dimethyl carbonate: 3-5% Defoamer: 0.1-0.3%; The waterproof primer coating is composed of the following raw materials in weight percentages, plus 0.03-0.05% defoamer and 0.1% catalyst: Polyether polyol A: 15-20% Trimethylolpropane: 2-3% Diphenylmethane diisocyanate: 25-30% Dimethyl carbonate: 35-40% Propylene carbonate: 10-15%; The polyether polyol A has a functionality of 2 and a hydroxyl value of 109-115 mgKOH / g; polyether polyol B has a functionality of 2 and a hydroxyl value of 54.5-57.5 mgKOH / g; polyether polyol C has a functionality of 3 and a hydroxyl value of 32.5-35.5 mgKOH / g; polyether polyol D has a functionality of 4 and a hydroxyl value of 747.5-748.5 mgKOH / g; polyether polyol E has a functionality of 3 and a hydroxyl value of 336-337 mgKOH / g; and the chain extender is WANALINK 6200. The asparagus resin A has a functionality of 2 and an amine value of 190. The construction method for the high weather-resistant composite silicone PU sports court surface layer includes the following steps: (1) Apply a waterproof primer to the foundation of the site, with a thickness of 0.2-0.5mm; (2) After the waterproof primer has cured, apply a layer of silicone PU material to the surface of the waterproof primer. The thickness of the layer is 4-6 mm, and it will cure in 20-24 hours. (3) After the silicone PU material layer has cured, mix the A and B components of the aspartic polyurea reinforcement layer evenly, and apply the aspartic polyurea reinforcement layer to the surface of the silicone PU material layer with a thickness of 2-4 mm. Curing time is 20-24 hours. (4) After the aspartic polyurea reinforcement layer has cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly, and spray or roll the water-based topcoat layer on the surface of the aspartic polyurea reinforcement layer with a thickness of 400-600μm. When applying the aspartic polyurea reinforcing layer, the amount of aspartic polyurea reinforcing layer material used is 1.1-1.5 kg per square meter of 1 mm thickness; The water-based topcoat layer is composed of water-based polyurethane emulsion and HDI curing agent in a mass ratio of 13.5-15:1; The filler is 400-mesh talc powder; the anti-settling agent is organic bentonite; the light stabilizer is UV-326; the antioxidant is 1010; the defoamer is organic silicone oil; and the catalyst is dibutyltin dilaurate.

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