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

Abstract

The invention relates to the technical field of ball scene surface layers, in particular to a high-weather-resistance composite silicon PU ball scene surface layer and a construction method thereof. The high-weather-resistance composite silicon PU ball scene surface layer comprises a waterproof priming coat, a silicon PU material layer, an asparagi polyurea reinforcing layer and a water-based finishing coat layer which are sequentially arranged from bottom to top. The waterproof bottom coating is used as a bottom sealing material, the silicon PU material is used as the bottom layer, the asparagine polyurea material is used as the reinforcing layer, and the water-based finishing paint is used as the color layer, so that the novel ball field surface layer which is good in weather resistance, high in rebound rate, excellent in performance and ultra-long in service life is obtained, the service life of the novel ball field surface layer exceeds 10 years, meanwhile, excellent physical performance is kept, and the service life of the novel ball field surface layer is prolonged. The defects that a common court is short in service life, poor in resilience, poor in impact absorption, not resistant to abrasion, prone to pulverization, high in cost, complex in construction and the like are effectively overcome, and knee joint safety and body health of athletes are fully protected.

Description

Technical Field

[0001] The present invention relates to the technical field of sports field surfaces, and specifically to a high-weather-resistant composite silicone PU sports field surface layer and its construction method. Background Art

[0002] With the development of the national fitness campaign, the requirements for sports facilities are also constantly increasing. Polyurethane materials have excellent wear resistance, anti-slip performance, flame retardancy, aging resistance, weather resistance, a wide range of hardness, suitable elasticity, excellent shock absorption performance. At the same time, the site is easy to maintain, with bright colors, beautiful and tidy appearance, and is not affected by climate and other conditions. The laid site is flat and uniform, can absorb vibrations, bounce freely, has a beautiful appearance, and can reduce the degree of injury if an athlete falls. It has now become an indispensable part of modern sports facilities. In recent years, the products of sports field surfaces will gradually become serialized and diversified, and the polyurethane sports field technology will also present a new situation. The emergence of many new materials has promoted the further development of sports fields in China towards higher performance, lower cost, more environmentally friendly and healthy directions.

[0003] Silicone PU is a healthy professional elastic sports field material. The silicone PU surface layer is tough and dense, not easily scratched by shoe soles or other hard objects, and can provide good protection for athletes, effectively avoiding possible injuries during sports. In order to improve the weather resistance, elasticity, wear resistance and service life of silicone PU sports fields, existing silicone PU sports fields mostly use different materials for multi-layer composite. However, due to the influence of outdoor environmental factors, most existing silicone PU sports fields will show problems such as fading, powdering, precipitation, and cracking of the surface layer after long-term exposure to sunlight and ultraviolet rays. Summary of the Invention

[0004] According to the above deficiencies in the prior art, the purpose of the present invention is to provide a high-weather-resistant composite silicone PU sports field surface layer with good weather resistance, good physical properties, high rebound rate, long service life, and simple construction.

[0005] Another purpose of the present invention is to provide a construction method for a high-weather-resistant composite silicone PU sports field surface layer, which is simple and easy to construct.

[0006] The present invention is realized by adopting the following technical solutions: The high-weather-resistant composite silicone PU sports field surface layer includes a waterproof bottom coating, a silicone PU material layer, an aliphatic polyurea strengthening layer, and a water-based topcoat layer arranged in sequence from bottom to top; The silicone PU material layer is composed of the following raw materials by mass percentage plus 3% of a leveling and curing agent: Polyether polyol A: 5 - 7% Polyether polyol B: 7 - 9% Polyether polyol C: 5 - 7% Long-chain 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 raw materials in the following mass percentages: Polyether polyol D: 25 - 30% Polyether polyol E: 30 - 35% Chain extender: 40 - 45%; The aspartic polyurea strengthening layer is a two-component product composed of component A and component B, with a mass ratio of 1:2. Component A is composed of raw materials in the following mass percentages: Aspartic 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% Color paste: 5 - 10%.

[0007] Component B is composed of raw materials in the following mass percentages: 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%.

[0008] The waterproof bottom coating is composed of raw materials in the following mass 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%.

[0009] The described water-based topcoat layer is composed of a water-based polyurethane emulsion and an HDI curing agent in a mass ratio of 13.5 - 15:1.

[0010] The polyether polyol A has a functionality of 2, a hydroxyl value of 109 - 115 mgKOH / g, and is preferably DDL - 1000D; the polyether polyol B has a functionality of 2, a hydroxyl value of 54.5 - 57.5 mgKOH / g, and is preferably C2020; the polyether polyol C has a functionality of 3, a hydroxyl value of 32.5 - 35.5 mgKOH / g, and is preferably DEP - 330N; the polyether polyol D has a functionality of 4, a hydroxyl value of 747.5 - 748.5 mgKOH / g, and is preferably T - 403; the polyether polyol E has a functionality of 3, a hydroxyl value of 336 - 337 mgKOH / g, and is preferably MN - 500; the chain extender is WANALINK6200.

[0011] The described aspartic resin A has a functionality of 2 and an amine value of 190, and is preferably F420.

[0012] The described filler is 400 - mesh talc powder; the anti - settling agent is organic bentonite; the light stabilizer is UV - 326; the antioxidant is 1010; the defoaming agent is silicone oil; the catalyst is dibutyltin dilaurate; the dispersant is 7456F.

[0013] The construction method of the high - weather - resistant composite silicon PU stadium surface layer includes the following steps: (1) Scrape and apply a waterproof primer layer on the site foundation for sealing, with a thickness of 0.2 - 0.5 mm; (2) After the waterproof primer layer cures, scrape and apply a silicon PU material layer on the surface of the waterproof primer layer, with a scraping thickness of 4 - 6 mm and curing for 20 - 24 h; (3) After the silicon PU material layer cures, mix the A and B components of the aspartic polyurea strengthening layer evenly, and scrape and apply the aspartic polyurea strengthening layer on the surface of the silicon PU material layer, with a thickness of 2 - 4 mm and curing for 20 - 24 h; (4) After the aspartic polyurea strengthening layer cures, mix the water - based polyurethane emulsion and the HDI curing agent of the water - based topcoat layer evenly, and spray or roll - coat the water - based topcoat layer on the surface of the aspartic polyurea strengthening layer, with a thickness of 400 - 600 μm; When scraping and applying the aspartic polyurea strengthening layer, the dosage of the aspartic polyurea strengthening layer material is: 1.1 - 1.5 kg per square meter with a thickness of 1 mm.

[0014] The water - based polyurethane emulsion is preferably 1602, and the HDI curing agent is preferably 72 - 100.

[0015] The surface layer of the stadium of the present invention adopts a composite surface layer structure combined with a waterproof primer material, a silicon PU material, an aspartic polyurea strengthening layer and a water-based topcoat. Among them: the waterproof primer is used as a sealing material. Firstly, the waterproof primer has permeability and can play a role in strengthening the foundation. Secondly, it can form a good film, play a sealing role to ensure that no water vapor seeps out, and ensure the basic construction conditions of the site, laying a good foundation for subsequent construction. The silicon PU material is used as the bottom layer material. Since the silicon PU material has good flexibility and elasticity, it plays a supporting role at the bottom layer and endows the surface layer of the stadium with good resilience. The aspartic polyurea strengthening layer is scraped on the silicon PU material to provide weather resistance, improve the physical properties of the stadium material, and is anti-aging, highly wear-resistant, and highly resilient. Then, according to the process requirements, various water-based topcoats are painted on the surface of the aspartic polyurea strengthening layer.

[0016] The resilience rate of the high-weather-resistant composite silicon PU stadium surface layer of the present invention is ≥50%, the tensile strength is ≥2 MPa, the elongation at break is ≥150%, the shock absorption is ≥35%, and after 1500 h of artificial climate accelerated aging, the above performance can still be maintained.

[0017] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention uses a waterproof primer as a sealing material, a silicon PU material as the bottom layer, an aspartic polyurea material as the strengthening layer, and a water-based topcoat as the color layer, so as to obtain a new type of stadium surface layer with good weather resistance, high resilience rate, excellent performance and extremely long service life. Its service life exceeds 10 years, and at the same time, it maintains excellent physical properties, effectively overcomes the defects of ordinary stadiums such as low service life, poor resilience, poor shock absorption, non-wear resistance, easy powdering, high cost, and complex construction, and fully protects the knee joint safety and physical health of athletes.

[0018] (2) The present invention selects different polyether polyols for compounding and interacts synergistically with other additives. The performance indicators of the high-elastic composite silicon PU stadium surface layer obtained by construction fully meet the standards of GB36246-2018, with a resilience rate of ≥50%, a tensile strength of ≥2 MPa, an elongation at break of ≥150%, and a shock absorption of ≥35%.

[0019] (3) For the aspartic polyurea strengthening layer made in the present invention, by using the structural characteristics of aspartic resin and adopting a low-free TDI prepolymer as a curing agent, the obtained strengthening layer has good weather resistance and improves the problem of short operation time of aspartic polyurea. The construction is convenient and can be completely cured within 24 h. After 1500 h of artificial climate accelerated aging, its resilience rate is ≥50%, the tensile strength is ≥2 MPa, the elongation at break is ≥150%, and the shock absorption is ≥35%. Detailed implementation mode

[0020] To make the objectives and technical solutions of the present invention clearer and more understandable, the present invention will be further described in detail below.

[0021] DDL-1000D, manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.; C2020, manufactured by Wanhua Chemical Group Co., Ltd.; DEP-330N, manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.; T-403, manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.; MN-500, manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.; WANALINK6200, manufactured by Wanhua Chemical Group Co., Ltd.; F420, manufactured by Shenzhen Feiyang Technology Co., Ltd.; 1601, manufactured by Guangzhou Kangdifu Environmental Protection Technology Co., Ltd.; 1602, manufactured by Guangzhou Kangdifu Environmental Protection Technology Co., Ltd.; 72-100, manufactured by Guangzhou Kangdifu Environmental Protection Technology Co., Ltd.; 655, manufactured by Guangzhou Kangdifu Environmental Protection Technology Co., Ltd.; 7456F, manufactured by Guangzhou Slok New Materials Co., Ltd.; DL-2000, manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.; MN-3050, manufactured by Zibo Dexin Federal Chemical Industry Co., Ltd.

[0022] In the following examples and comparative examples: 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 defoaming agent is silicone oil; the catalyst is dibutyltin dilaurate; the dispersant is 7456F.

[0023] Example 1 The high weather-resistant composite silicone PU court surface layer, from bottom to top, is a 0.5-mm waterproof primer layer, a 6-mm silicone PU material layer, a 2-mm aspartic polyurea strengthening layer, and a 400-μm water-based topcoat layer.

[0024] The silicone PU material layer is composed of the following raw materials by mass percentage plus 3% of a leveling and curing agent: DDL-1000D: 6% C2020: 8% DEP-330N: 6% 52# long-chain chlorinated paraffin: 5% DOTP: 5% Diphenylmethane diisocyanate: 10% Magnesium oxide: 2% Filler: 43.99% Kaolin: 6% Light stabilizer: 0.2% Antioxidant: 0.2% Defoamer: 0.1%; Dispersant: 0.1% Catalyst: 0.01% Dimethyl carbonate: 7.4%; The leveling and curing agent is composed of the following raw materials by mass percentage: T-403: 25% MN500: 35% WANALINK6200: 40%.

[0025] The aspartic polyurea strengthening layer is a two-component product with a mass ratio of 1:2. Component A is composed of the following raw materials by mass percentage: F420: 40% Defoamer: 0.1% Dispersant: 0.3% Anti-settling agent: 0.3% Barium sulfate: 45% Molecular sieve: 5% Light stabilizer: 0.2% Antioxidant: 0.2% Color paste: 8.9%.

[0026] Component B is composed of the following raw materials by mass percentage: DDL-1000D: 25% DEP-330N: 45% DOTP: 10% Toluene diisocyanate: 15% Dimethyl carbonate: 4.7% Defoamer: 0.3%.

[0027] The waterproof bottom coating is composed of the following raw materials by mass percentage plus 0.03% of organosilicon oil and 0.1% of dibutyltin dilaurate: Polyether polyol A: 20% Trimethylolpropane: 2% Diphenylmethane diisocyanate: 30% Dimethyl carbonate: 35% Propylene carbonate: 13%.

[0028] The waterborne topcoat layer is composed of 1602 and 72-100 in a mass ratio of 15:1.

[0029] The construction method is as follows: (1) First, the site foundation should be sorted out. The foundation should be solid and flat (flatness requirement: the error of a 3m straightedge is not more than 3mm), with a certain drainage slope, and the strength reaches the building concrete standard C25 strength. After pouring, it should be water-cured for at least 7 days, and the overall curing period should be at least 28 days. Before construction, the moisture in the site should be verified. When the moisture is too high, construction is prohibited; the pH value should meet the requirements. Then, roll on the waterproof primer layer with a thickness of 0.5mm. (2) After the waterproof primer layer is cured, scrape the silicon PU material layer on the surface of the waterproof primer layer with a scraping thickness of 6mm and cure for 24h. (3) After the silicon PU material layer is cured, mix the A and B components of the aspartic polyurea strengthening layer evenly, and scrape the aspartic polyurea strengthening layer on the surface of the silicon PU material layer. 1.1kg is used per square meter with a thickness of 1mm and a thickness of 2mm, and cure for 24h. (4) After the aspartic polyurea strengthening layer is cured, mix the waterborne polyurethane emulsion and HDI curing agent of the waterborne topcoat layer evenly, and roll on the waterborne topcoat layer on the surface of the aspartic polyurea strengthening layer with a thickness of 400μm.

[0030] Example 2 A highly weather-resistant composite silicon PU stadium surface layer, from bottom to top, is a 0.5mm waterproof primer layer, a 4mm silicon PU material layer, a 4mm aspartic polyurea strengthening layer, and a 400μm waterborne topcoat layer.

[0031] The silicon PU material layer is composed of the following raw materials by mass percentage plus 3% of a leveling and curing agent: DDL-1000D: 5% C2020: 9% DEP-330N: 5% 52# long-chain chlorinated paraffin: 6% DOTP: 4% Diphenylmethane diisocyanate: 9% Magnesium oxide: 3% Filler: 43.65% Kaolin: 7% Light stabilizer: 0.5% Antioxidant: 0.3% Defoamer: 0.3%; Dispersant: 0.2% Catalyst: 0.05% Dimethyl carbonate: 7%.

[0032] The leveling and curing agent mentioned above is composed of the following raw materials by mass percentage: T - 403: 26% MN500: 35% WANALINK6200: 39%.

[0033] The aspartic polyurea strengthening layer is a two - component product with a mass ratio of 1:2. Component A consists of raw materials with the following mass percentages: F420: 42% Defoamer: 0.2% Dispersant: 0.3% Anti - settling agent: 0.5% Barium sulfate: 43% Molecular sieve: 5% Light stabilizer: 0.5% Antioxidant: 0.5% Color paste: 8%.

[0034] Component B consists of raw materials with the following mass percentages: DDL - 1000D: 30% DEP - 330N: 40% DOTP: 10% Toluene diisocyanate: 15% Dimethyl carbonate: 4.7% Defoamer: 0.3%.

[0035] The waterproof bottom coating consists of raw materials with the following mass percentages plus 0.05% of organosilicon oil and 0.1% of dibutyltin dilaurate: Polyether polyol A: 18% Trimethylolpropane: 2% Diphenylmethane diisocyanate: 30% Dimethyl carbonate: 35% Propylene carbonate: 15%.

[0036] The water - borne topcoat layer consists of 1602 and 72 - 100 in a mass ratio of 15:1.

[0037] The construction method is as follows: (1) First, the site foundation should be sorted out. The foundation should be firm and flat (flatness requirement: the error of a 3m straightedge is not more than 3mm), with a certain drainage slope, and the strength reaches the building concrete standard C25 strength. After pouring, water conservation should be carried out for at least 7 days, and the overall curing period should be no less than 28 days; before construction, the moisture of the site should be verified, and construction is prohibited when the moisture is too high; the pH value should meet the requirements. Then, roll - coat the waterproof bottom coating with a thickness of 0.5mm; (2) After the waterproof bottom coating is cured, scrape - coat the silicon PU material layer on the surface of the waterproof bottom coating with a scraping thickness of 4mm and cure for 24h; (3) After the silicon PU material layer is cured, mix the A and B components of the aspartic polyurea strengthening layer evenly, and scrape and coat the aspartic polyurea strengthening layer on the surface of the silicon PU material layer. Use 1.1 kg per square meter for a thickness of 1 mm, with a thickness of 4 mm and cure for 24 hours. (4) After the aspartic polyurea strengthening layer is cured, mix the waterborne polyurethane emulsion and HDI curing agent of the waterborne topcoat layer evenly, and spray the waterborne topcoat layer on the surface of the aspartic polyurea strengthening layer with a thickness of 400 μm.

[0038] Example 3 A highly weather-resistant composite silicon PU stadium surface layer, from bottom to top, is a 0.5 mm waterproof bottom coating, a 5 mm silicon PU material layer, a 3 mm aspartic polyurea strengthening layer, and a 400 μm waterborne topcoat layer.

[0039] The silicon PU material layer is composed of the following raw materials by mass percentage plus 3% of a leveling and curing agent: DDL-1000D: 7% C2020: 8% DEP-330N: 7% 52# long-chain chlorinated paraffin: 4% DOTP: 6% Diphenylmethane diisocyanate: 9% Magnesium oxide: 2% Filler: 40% Kaolin: 8% Light stabilizer: 0.2% Antioxidant: 0.2% Defoamer: 0.3%; Dispersant: 0.2% Catalyst: 0.1% Dimethyl carbonate: 8%.

[0040] The leveling and curing agent is composed of the following raw materials by mass percentage: T-403: 27% MN500: 34% WANALINK6200: 39%.

[0041] The aspartic polyurea strengthening layer is a two-component product with a mass ratio of 1:2. The A component is composed of the following raw materials by mass percentage: F420: 45% Defoamer: 0.1% Dispersant: 0.3% Anti-settling agent: 0.3% Barium sulfate: 40% Molecular sieve: 5% Light stabilizer: 0.2% Antioxidant: 0.2% Color paste: 8.9%.

[0042] Component B consists of raw materials in the following mass percentages: DDL-1000D: 28% DEP-330N: 40% DOTP: 15% Toluene diisocyanate: 12% Dimethyl carbonate: 4.7% Defoamer: 0.3%.

[0043] The waterproof primer coat consists of raw materials in the following mass percentages plus 0.04% of organosilicon oil and 0.1% of dibutyltin dilaurate: Polyether polyol A: 18% Trimethylolpropane: 2.5% Diphenylmethane diisocyanate: 29% Dimethyl carbonate: 37.5% Propylene carbonate: 13%.

[0044] The water-based topcoat layer consists of 1602 and 72-100 in a mass ratio of 15:1.

[0045] The construction method is as follows: (1) First, the site foundation should be sorted out. The foundation should be firm and flat (flatness requirement: the error of a 3m straightedge should not be more than 3mm), have a certain drainage slope, reach the strength of building concrete standard C25, be water-retained and cured for at least 7 days after pouring, and the overall curing period should be at least 28 days; before construction, the moisture of the site should be verified, and construction is prohibited when the moisture is too high; the pH value should meet the requirements. Then roll on the waterproof primer coat with a thickness of 0.5mm; (2) After the waterproof primer coat is cured, scrape on the silicon PU material layer on the surface of the waterproof primer coat with a scraping thickness of 5mm and cure for 24h; (3) After the silicon PU material layer is cured, mix Component A and Component B of the aspartic polyurea strengthening layer evenly and scrape on the aspartic polyurea strengthening layer on the surface of the silicon PU material layer. 1.1kg is used for every 1mm thickness per square meter, with a thickness of 3mm and cure for 24h; (4) After the aspartic polyurea strengthening layer is cured, mix the water-based polyurethane emulsion and HDI curing agent of the water-based topcoat layer evenly and roll on the water-based topcoat layer on the surface of the aspartic polyurea strengthening layer with a thickness of 400μm.

[0046] Comparative Example 1 A highly wear-resistant composite silicon PU court surface layer, from bottom to top, is successively a 0.2mm waterproof primer coat, a 6mm silicon PU material layer, a 2mm polyurethane self-leveling layer, and a 200μm water-based topcoat layer.

[0047] The silicon PU material layer consists of raw materials with the following mass percentages plus 0.01% of dibutyltin dilaurate: DL-2000: 22.5% DL-1000: 1% EP-330N: 4.8% Chlorinated palm oil: 7.5% DOTP: 7.5% Diphenylmethane diisocyanate: 10% Magnesium oxide: 5% 400-mesh talcum powder: 40% Organic bentonite: 0.5% UV-326: 0.5% 1010: 0.5% Organic silicone oil: 0.2%.

[0048] 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 raw materials with the following mass percentages plus 0.03% of organic silicone oil, and the curing crosslinking agent is a compound of organic zinc and organic bismuth in a mass ratio of 3:1: MN-3050: 10% EP-330N: 65% MOCA: 19.5% DOTP: 5% Curing crosslinking agent: 0.5%.

[0049] Component B consists of raw materials with the following mass percentages plus 0.03% of organic silicone oil: DL-2000: 58.4% Diphenylmethane diisocyanate 35% DOTP: 6.6%.

[0050] The waterproof primer layer consists of raw materials with the following mass percentages plus 0.03% of organic silicone oil: DL-1000: 12.2% Trimethylolpropane: 2% Diphenylmethane diisocyanate: 22.8% Dimethyl carbonate: 49% Butyl acetate: 14%.

[0051] The water-based topcoat layer is composed of 1601 and 655 in a mass ratio of 15:1.

[0052] The construction method is as follows: (1) First, tidy up the site foundation to ensure that the hardness, humidity, strength, and pH value of the site foundation meet the requirements. Then, roll on the waterproof primer coat with a thickness of 0.2 mm. (2) After the waterproof primer coat cures, apply a layer of silicon PU material on the surface of the waterproof primer coat by scraping, with a scraping thickness of 6 mm and curing for 24 h. (3) After the silicon PU material layer cures, mix components A and B of the polyurethane self-leveling layer evenly, and apply the polyurethane self-leveling layer on the surface of the silicon PU material layer. For every 1 mm thickness per square meter, 1.35 kg is used, with a thickness of 2 mm and curing for 24 h. (4) After the polyurethane self-leveling layer cures, mix the waterborne polyurethane emulsion and HDI curing agent of the waterborne topcoat layer evenly, and roll on the waterborne topcoat layer on the surface of the silicon PU material layer with a thickness of 200 μm.

[0053] Comparative Example 2 A high-elastic composite silicon PU court surface layer, from bottom to top, is successively a 0.2-mm waterproof primer coat, a 6-mm foamed plastic material layer, a 2-mm silicon PU material layer, and a 200-μm waterborne topcoat layer.

[0054] The foamed plastic material layer is composed of component A and component B with a mass ratio of 5:1 and 0.5% of the total mass of component A and component B of the curing agent. The curing agent is a compound of organic zinc and organic bismuth with a mass ratio of 4:1. Component A is composed of the following raw materials in mass percentages: MN-3050: 11% 45# paraffin wax: 20% Chlorinated palm oil: 11.5% MOCA: 2.1% Iron oxide green: 0.3% 400-mesh talcum powder: 54% Organic bentonite: 0.5% UV-326: 0.3% 1010: 0.3%.

[0055] Component B is composed of the following raw materials in mass percentages: MN-3050: 13.6% DL-2000: 54.2% MDI-50: 32.2%.

[0056] The silicon PU material layer is composed of the following raw materials by adding 0.01% of dibutyltin dilaurate: DL-2000: 24% DL-1000: 0.8% EP-330N: 4.7% Chlorinated palm oil: 7.5% DOTP: 7.5% Diphenylmethane diisocyanate: 10% Magnesium oxide: 4.7% 400-mesh talcum powder: 40% Organobentonite: 0.3% UV-326: 0.2% 1010: 0.2% Organosilicone oil: 0.1%.

[0057] The waterproof primer coat is composed of raw materials in the following mass percentages plus 0.03% of organosilicone oil: DL-1000: 12% Trimethylolpropane: 2% Diphenylmethane diisocyanate: 23% Dimethyl carbonate: 49% Butyl acetate: 14%.

[0058] The water-based topcoat layer is composed of 1601 and 655 in a mass ratio of 15:1.

[0059] The construction method is as follows: (1) First, tidy up the site foundation to ensure that the hardness, humidity, strength, and pH value of the site foundation meet the requirements, and then roll-coat the waterproof primer coat with a thickness of 0.2 mm; (2) After the waterproof primer coat is cured, mix the A and B components of the foamed plastic material layer evenly, add the curing agent and stir well, and scrape-coat the foamed plastic material layer on the surface of the waterproof primer coat. The scraping amount is 1.2 kg per square meter with a thickness of 1 mm, and the scraping thickness is 6 mm, forming in one time, with a surface drying time of 12 h and a curing time of 24 h; (3) After the foamed plastic material layer is cured, scrape-coat the silicon PU material layer on its surface with a scraping thickness of 2 mm and a curing time of 24 h; (4) After the silicon PU material layer is 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 silicon PU material layer with a thickness of 200 μm.

[0060] Comparative Example 3 A highly weather-resistant composite silicon PU stadium surface layer, which from bottom to top is a 0.15-mm waterproof primer coat, a 3-mm silicon PU material layer, a 5-mm aspartic polyurea strengthening layer, and a 400-μm water-based topcoat layer.

[0061] The silicon PU material layer is composed of raw materials in the following mass percentages plus 3% of dibutyltin dilaurate: DDL-1000D: 6% C2020: 8% DEP-330N: 6% 52# Long-chain chlorinated paraffin: 5% DOTP: 5% Diphenylmethane diisocyanate: 10% Magnesium oxide: 2% Filler: 35% Kaolin: 5% Light stabilizer: 0.2% Antioxidant: 0.2% Defoamer: 0.1%; Dispersant: 0.1% Catalyst: 0.01% Dimethyl carbonate: 7.4%.

[0062] The aspartic polyurea reinforcement layer is a two-component product with a mass ratio of 1:2. Component A consists of raw materials in the following mass percentages: F420: 40% Defoamer: 0.1% Dispersant: 0.3% Anti-settling agent: 0.3% Barium sulfate: 45% Molecular sieve: 5% Light stabilizer: 0.2% Antioxidant: 0.2% Color paste: 8.9%.

[0063] Component B consists of raw materials in the following mass percentages: DDL-1000D: 25% DEP-330N: 45% DOTP: 10% Toluene diisocyanate: 15% Dimethyl carbonate: 4.7% Defoamer: 0.3%.

[0064] The waterproof bottom coating consists of raw materials in the following mass percentages plus 0.03% of organosilicon oil and 0.1% of dibutyltin dilaurate: Polyether polyol A: 20% Trimethylolpropane: 2% Diphenylmethane diisocyanate: 30% Dimethyl carbonate: 35% Propylene carbonate: 13%.

[0065] The waterborne topcoat layer consists of 1602 and 72-100 in a mass ratio of 15:1.

[0066] The construction method is as follows: (1)The site foundation shall be sorted out first. The foundation shall be firm and flat (flatness requirement: the error of a 3m straightedge shall not be greater than 3mm), with a certain drainage slope, and the strength shall reach the building concrete standard C25. After pouring, water conservation shall be carried out for not less than 7 days, and the overall curing period shall be not less than 28 days. Before construction, the moisture of the site shall be verified. When the moisture is too high, construction is prohibited; the pH value shall meet the requirements. Then, a waterproof primer coat shall be roller-coated with a thickness of 0.15mm; (2)After the waterproof primer coat is cured, a silicon PU material layer shall be scraped on the surface of the waterproof primer coat with a scraping thickness of 3mm and cured in 24h; (3)After the silicon PU material layer is cured, components A and B of the aspartic polyurea strengthening layer shall be mixed evenly, and the aspartic polyurea strengthening layer shall be scraped on the surface of the silicon PU material layer. 1.1kg is used per square meter with a thickness of 1mm and a thickness of 5mm, and cured in 24h; (4)After the aspartic polyurea strengthening layer is cured, the waterborne polyurethane emulsion and HDI curing agent of the waterborne topcoat layer shall be mixed evenly, and the waterborne topcoat layer shall be roller-coated on the surface of the aspartic polyurea strengthening layer with a thickness of 400μm.

[0067] Comparative Example 4 A highly weather-resistant composite silicon PU court surface layer, from bottom to top, is a 0.15mm waterproof primer coat, a 7mm silicon PU material layer, a 1mm aspartic polyurea strengthening layer, and a 400μm waterborne topcoat layer.

[0068] The silicon PU material layer consists of the following raw materials by mass percentage plus 3% of dibutyltin dilaurate: DDL-1000D: 6% C2020: 8% DEP-330N: 6% 52# long-chain chlorinated paraffin: 5% DOTP: 5% Diphenylmethane diisocyanate: 10% Magnesium oxide: 2% Filler: 35% Kaolin: 5% Light stabilizer: 0.2% Antioxidant: 0.2% Defoamer: 0.1%; Dispersant: 0.1% Catalyst: 0.01% Dimethyl carbonate: 7.4%.

[0069] The aspartic polyurea strengthening layer is a two-component product with a mass ratio of 1:2. Component A consists of the following raw materials by mass percentage: F420: 40% Defoamer: 0.1% Dispersant: 0.3% Anti-settling agent: 0.3% Barium sulfate: 45% Molecular sieve: 5% Light stabilizer: 0.2% Antioxidant: 0.2% Color paste: 8.9%.

[0070] Component B is composed of raw materials in the following mass percentages: DDL-1000D: 25% DEP-330N: 45% DOTP: 10% Toluene diisocyanate: 15% Dimethyl carbonate: 4.7% Defoaming agent: 0.3%.

[0071] The waterproof bottom coating is composed of raw materials in the following mass percentages plus 0.05% of organic silicone oil and 0.1% of dibutyltin dilaurate: Polyether polyol A: 20% Trimethylolpropane: 2% Diphenylmethane diisocyanate: 30% Dimethyl carbonate: 35% Propylene carbonate: 13%.

[0072] The waterborne topcoat layer is composed of 1602 and 72-100 in a mass ratio of 15:1.

[0073] The construction method is as follows: (1) First, the site foundation should be sorted out. The foundation should be solid and flat (the flatness requirement: the error of a 3m straightedge is not more than 3mm), with a certain drainage slope, and the strength reaches the building concrete standard C25 strength. After pouring, water conservation and curing should be carried out for no less than 7 days, and the overall curing period should be no less than 28 days; before construction, the moisture of the site should be verified, and construction is prohibited when the moisture is too high; the pH value should meet the requirements. Then roll-coat the waterproof bottom coating with a thickness of 0.15mm; (2) After the waterproof bottom coating is cured, scrape-coat the silicon PU material layer on the surface of the waterproof bottom coating with a scraping thickness of 7mm and cure for 24h; (3) After the silicon PU material layer is cured, mix the A and B components of the aspartic polyurea strengthening layer evenly, and scrape-coat the aspartic polyurea strengthening layer on the surface of the silicon PU material layer. 1.1kg is used per square meter with a thickness of 1mm and cure for 24h; (4) After the aspartic polyurea strengthening layer is cured, mix the waterborne polyurethane emulsion and HDI curing agent of the waterborne topcoat layer evenly, and spray the waterborne topcoat layer on the surface of the aspartic polyurea strengthening layer with a thickness of 400μm.

[0074] The performance of the stadium surface layers constructed in Examples 1-3 was tested in accordance with GB36246-2018, and the test results are shown in Table 1.

[0075] The performance test results of the stadium surface layers constructed in Examples 1-3 after 1500h of artificial accelerated weathering are shown in Table 2.

[0076] The performance test results of the stadium surface layers constructed in Example 1 and Comparative Examples 1-4 are shown in Table 3.

[0077] The performance test results of the stadium surface layers constructed in Example 1 and Comparative Examples 1-4 after 1500h of artificial accelerated weathering are shown in Table 4.

[0078] Table 1 Performance test results of the stadium surface layers constructed in Examples 1-3

[0079] Table 2 Performance test results of the stadium surface layers constructed in Examples 1-3 after 1500h of artificial accelerated weathering

[0080] Table 3 Performance test results of the stadium surface layers constructed in Example 1 and Comparative Examples 1-4

[0081] Table 4 Performance test results of the stadium surface layers constructed in Example 1 and Comparative Examples 1-4 after 1500h of artificial accelerated weathering

[0082] According to the above table, Example 1 and Comparative Examples 1-2 show the differences in weather resistance between the present invention and other stadium surface layers. The data in Comparative Examples 1-2 indicate that during the process of artificial accelerated aging, the physical properties and the like are severely affected, while the stadium surface layer described in the present invention is less affected, greatly extending the service life of the stadium surface layer.

[0083] Example 1 and Comparative Examples 3-4 show the comparison of the thicknesses of each structural layer. In Comparative Example 3, the thickness of the silicon PU material layer is 3mm, and the thickness of the polyaspartic polyurea strengthening layer is 5mm. Due to the relatively thin thickness of the silicon PU material layer and the relatively thick thickness of the polyaspartic polyurea strengthening layer, the overall rebound rate of the stadium surface layer is poor, the shock absorption is low, and during use, the protection of athletes is poor. In Comparative Example 4, the thickness of the silicon PU material layer is 7mm, and the thickness of the polyaspartic polyurea strengthening layer is 1mm. Due to the relatively thick thickness of the silicon PU material layer and the relatively thin thickness of the polyaspartic polyurea strengthening layer, the weather resistance of the stadium surface layer is insufficient, the strength is poor, and the performance is greatly affected during the process of artificial accelerated aging, affecting the service life of the stadium surface layer.

Claims

1. A high weather-resistant composite silicon PU court surface layer, characterized in that, It includes a waterproof bottom coating, a silicon PU material layer, an aspartic polyurea strengthening layer, and an aqueous topcoat layer, which are arranged in sequence from bottom to top; The silicon PU material layer is composed of raw materials in the following mass percentages plus 3% of a 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 raw materials in the following mass percentages: Polyether polyol D: 25 - 30% Polyether polyol E: 30 - 35% Chain extender: 40 - 45%; The aspartic polyurea strengthening layer is a two-component product composed of component A and component B, with a mass ratio of 1:

2. Component A is composed of raw materials in the following mass percentages: Aspartic 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% Color paste: 5 - 10%.

2. The high weather-resistant composite silicone PU court surface layer according to claim 1, wherein Component B is composed of raw materials in the following mass percentages: 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%.

3. The high weather-resistant composite silicone PU court surface layer according to claim 1, characterized in that The waterproof bottom coating is composed of raw materials in the following mass percentages plus 0.03 - 0.05% of defoamer and 0.1% of catalyst: Polyether polyol A: 15 - 20% Trimethylolpropane: 2 - 3% Diphenylmethane diisocyanate: 25 - 30% Dimethyl carbonate: 35 - 40% Propylene carbonate: 10 - 15%.

4. The high weather-resistant composite silicone PU court surface layer according to claim 1, characterized in that, The aqueous topcoat layer is composed of an aqueous polyurethane emulsion and an HDI curing agent in a mass ratio of 13.5 - 15:

1.

5. The high weather-resistant composite silicone PU court surface layer according to claim 1, characterized in that The functionality of polyether polyol A is 2, and its hydroxyl value is 109 - 115mgKOH / g; the functionality of polyether polyol B is 2, and its hydroxyl value is 54.5 - 57.5mgKOH / g; the functionality of polyether polyol C is 3, and its hydroxyl value is 32.5 - 35.5mgKOH / g; the functionality of polyether polyol D is 4, and its hydroxyl value is 747.5 - 748.5mgKOH / g; the functionality of polyether polyol E is 3, and its hydroxyl value is 336 - 337mgKOH / g; the chain extender is WANALINK6200.

6. The high-weather-resistant composite silicon PU court surface layer according to claim 1, characterized in that, The functionality of aspartic resin A is 2, and its amine value is 190.

7. The high weather-resistant composite silicone PU court surface layer according to claim 1, wherein 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 silicone oil; the catalyst is dibutyltin dilaurate.

8. A construction method of the high-weather-resistant composite silicone PU stadium floor surface according to any one of claims 1-7, characterized in that, It includes the following steps: (1)Scrape and apply a waterproof primer on the site foundation for sealing, with a thickness of 0.2 - 0.5 mm; (2)After the waterproof primer cures, scrape and apply a silicon PU material layer on the surface of the waterproof primer, with a scraping thickness of 4 - 6 mm and curing for 20 - 24 h; (3)After the silicon PU material layer cures, mix the A and B components of the aspartic polyurea strengthening layer evenly, and scrape and apply the aspartic polyurea strengthening layer on the surface of the silicon PU material layer, with a thickness of 2 - 4 mm and curing for 20 - 24 h; (4)After the aspartic polyurea strengthening layer cures, mix the waterborne polyurethane emulsion and HDI curing agent of the waterborne topcoat layer evenly, and spray or roll - coat the waterborne topcoat layer on the surface of the aspartic polyurea strengthening layer, with a thickness of 400 - 600 μm; When scraping and applying the aspartic polyurea strengthening layer, the dosage of the aspartic polyurea strengthening layer material is: 1.1 - 1.5 kg per square meter with a thickness of 1 mm.

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