Two-component hydrophobic micro-foamed self-skinning polyurethane court material and method of making same

Abstract

The application belongs to the technical field of polyurethane paving materials, and particularly relates to a two-component hydrophobic micro-foaming self-skin polyurethane court material and a preparation method thereof. The polyurethane court material is prepared by mixing two components A and B in a mass ratio of (2.5-3):1, wherein the component A comprises polyether polyol A, polyether polyol B, a chain extender, a plasticizer, a filler, a pigment, a foam stabilizer, an anti-settling additive, a complex catalyst, water and a defoaming agent; and the component B comprises polyether polyol A, polyether polyol C, isocyanate, an antioxidant and an ultraviolet absorber. The micro-foaming self-skin material is prepared by introducing the complex catalyst through precise formula design, and the defoaming agent is added to increase the surface skin thickness; the modified components such as the hydrophobic polyether polyol are selected to optimize the micro-pore water absorption resistance and endow the material with excellent hydrophobicity. The final material has high mechanical properties, excellent wear resistance and outstanding hydrophobicity, and has excellent comprehensive performance.

Description

Technical Field

[0001] This invention belongs to the technical field of polyurethane paving materials, specifically relating to a two-component hydrophobic microfoamed self-skinning polyurethane sports court material and its preparation method. Background Technology

[0002] Polyurethane paving materials are a type of polyurethane elastomer material used for flooring in various locations. They are widely used in sports fields, highways, ground surfaces, parks, and other venues, characterized by good elasticity, comfort, and vibrant colors. Sports venues include synthetic running tracks, synthetic basketball courts, and synthetic badminton courts. Synthetic basketball courts are already used in primary and secondary schools, universities, stadiums, and public sports venues. With the widespread application of synthetic basketball courts and the continuous improvement of mandatory standards, increasing attention is being paid to the physical performance and comfort of basketball courts. Conventional 8mm court materials absorb 18-24% of the impact, but their vertical deformation is below 0.5mm, far below the 0.6mm limit set in GB 36246-2018. This leads to decreased comfort during exercise and increases the risk of injury to athletes.

[0003] To improve vertical deformation performance, many manufacturers apply a two-layer elastic layer to basketball courts, typically a 6mm micro-foamed layer. However, this micro-foamed elastic layer suffers from fatal flaws, including high water absorption, poor mechanical properties, and poor abrasion resistance. Therefore, a 2mm reinforcing layer is needed on top of the foamed elastic layer to improve surface mechanical properties and abrasion resistance. This increases the number of construction steps and extends the construction period. Considering the core performance requirements of basketball courts in terms of impact absorption and vertical deformation, and to simplify construction procedures, shorten the construction period, and reduce construction risks, it is necessary to develop a two-component hydrophobic micro-foamed self-skinning polyurethane court material.

[0004] Chinese patent CN107129566A discloses a polyurethane sports court material and its preparation method, comprising the following components in parts by weight: 60-100 parts of polyether polyol, 8-15 parts of diphenylmethane diisocyanate, 15-30 parts of reinforcing filler, 10-20 parts of dearomatic solvent oil, 0.05-0.1 parts of composite catalyst, and 0.5-3 parts of additives. In the environment of the dearomatic solvent oil, it helps to remove moisture from the polyether polyol and other fillers; the steric hindrance of the dearomatic solvent oil is reduced, and the polarity difference between the dearomatic solvent oil and other components is reduced, preventing the formation of hydrogen bonds with the hydroxyl groups of the alcohol and thus affecting the reaction rate, which is beneficial to improving dehydration efficiency and enhancing the thoroughness of the reaction. However, three key defects still exist: First, the surface mechanical properties are insufficient. The one-time molding of single-component polyurethane materials, due to their high foaming rate, uniform density, and microporous structure, results in low surface strength and a short service life. Second, the stability of the compounded catalyst in the single-component system is poor. Zinc isooctanoate and bismuth isooctanoate easily promote the self-polymerization reaction of -NCO groups in the system, thereby causing the material to gel and deteriorate. Third, the dearomatic solvent oil used does not meet environmental protection requirements, and its chemical testing indicators do not meet the relevant provisions of "Synthetic Material Surface Layer Sites for Primary and Secondary Schools" (GB 36246-2018). Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a two-component hydrophobic microfoamed self-skinning polyurethane sports court material with a scientifically and rationally formulated composition, exhibiting high mechanical properties, wear resistance, and excellent hydrophobicity. The present invention also provides a simple and easy-to-implement preparation method suitable for large-scale production.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is prepared from two components, A and B, in a mass ratio of (2.5-3):1.

[0008] Component A comprises the following raw materials in parts by weight:

[0009] Polyether polyol A: 10.5–13.5 parts;

[0010] Polyether polyol B: 24.5–31.5 parts;

[0011] Chain extender: 5-9 parts;

[0012] Plasticizer: 15-20 parts;

[0013] Filler: 20-30 parts;

[0014] Pigment: 5-7 parts;

[0015] Foam stabilizer: 0.5–1 part;

[0016] Anti-settling agent: 1-5 parts;

[0017] Compound catalyst: 0.5–1 part;

[0018] Water: 0.2–0.3 parts;

[0019] Defoamer: 0.1–0.2 parts;

[0020] Component B comprises the following parts by mass of raw materials:

[0021] Polyether polyol A: 22-26 parts;

[0022] Polyether polyol C: 33-39 parts;

[0023] Isocyanate: 30-40 parts;

[0024] Antioxidant: 1-3 parts;

[0025] UV absorber: 1-3 parts;

[0026] The polyether polyol A is an EO / PO copolymer polyether triol; the polyether polyol B is a hydrophobic polyether polyol; the polyether polyol C is polytetramethylene ether glycol; the composite catalyst is a mixture of bismuth isooctanoate, zirconium isooctanoate, and an amine foaming catalyst, with a mass ratio of 2:1:(2.5-3). Zirconium isooctanoate can reduce the selectivity of reaction with water, increase the reaction rate of -NCO with -OH in the polyether polyol, promote rapid gelation, and when combined with an amine foaming catalyst, it can achieve a balance between gelation and foaming, avoiding the blistering problem of thick coatings; the anti-settling agent is polyamide wax powder, preferably ULTRA produced by Arkema.

[0027] Preferably, the polyether polyol A is SEP-560S produced by Wudi Dexin Chemical Co., Ltd., with a functionality of 3, EO / PO copolymerized polyether triol, and a number average molecular weight of 3000.

[0028] The polyether polyol B mentioned is Dow Chemical's VORAPEL D3201, which has a functionality of 2, is a hydrophobic polyether polyol, and has a number average molecular weight of 2000.

[0029] The polyether polyol C mentioned is PTMG 2000 produced by Shandong Lanxing Dongda Chemical Co., Ltd., with a functionality of 2, and is a polytetramethylene ether diol with a number average molecular weight of 2000.

[0030] The preferred amine foaming catalyst is MAYCAT RA1, produced by Jiangsu Meiside Chemical Co., Ltd.

[0031] The chain extender is 4,4'-methylenebis(2-chloroaniline), preferably MOCA produced by Suzhou Xiangyuan Chemical Co., Ltd.

[0032] The plasticizer is chloropalmitoyl palmitate.

[0033] The filler is silane-modified 400-mesh talc powder, preferably a product of Shanghai Huijing Asia Nanomaterials Co., Ltd.

[0034] The pigment in question is iron oxide green.

[0035] The foam stabilizer mentioned is M6686LVE produced by Jiangsu Meiside Chemical Co., Ltd.

[0036] The defoamer mentioned is oil-based non-silicone defoamer B-455 produced by Guangdong Zhongke Hongtai New Materials Co., Ltd.

[0037] The isocyanate is diphenylmethane diisocyanate, preferably MDI-50 produced by Wanhua Chemical Group Co., Ltd.

[0038] The antioxidant mentioned is antioxidant 1010 manufactured by Great Lakes Chemical Corporation.

[0039] The ultraviolet absorber mentioned is UV-320 produced by Yongguang Chemical Industry Co., Ltd. in Taiwan, China.

[0040] The preparation method of the two-component hydrophobic microfoamed self-skinning polyurethane sports court material of the present invention includes the following steps:

[0041] (1) Preparation of component A: Polyether polyol A, polyether polyol B and plasticizer are put into the reactor and stirred. Chain extender, filler, pigment and anti-settling agent are added at 60-70℃. The temperature is raised to 95-100℃ and vacuum dehydrated (to water content ≤0.03%). Then, compound catalyst, foam stabilizer, water and defoamer are added and stirred evenly to obtain component A.

[0042] (2) Component B preparation: Isocyanate is added to the reactor, stirring is started, polyether polyol A and polyether polyol C are added at 40-50℃, the temperature is raised to 72-78℃, the temperature is maintained, ultraviolet absorber and antioxidant are added, the temperature is maintained at 72-78℃ for reaction, and the -NCO mass content is measured to be 7.3-11.2% to obtain component B;

[0043] (3) Mix component A and component B evenly, spread the mixture to a thickness of 8 mm, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports field material.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] (1) This invention utilizes a catalyst blend of a strong gel catalyst and a delayed amine foaming catalyst to ensure sufficient operating time and fluidity during paving. By introducing PTMG and the proportion of the blended catalyst through formulation design, the surface skinning rate is faster than the foaming rate. Simultaneously, an antifoaming agent is added to eliminate surface bubbles, resulting in a dense surface that significantly improves mechanical properties and wear resistance. After the skin forms, the interior slowly foams, forming a microporous structure. This provides excellent impact absorption and vertical deformation performance, while the dense surface structure provides excellent wear resistance.

[0046] (2) The present invention introduces hydrophobic polyether polyol, whose macromolecular structure can effectively improve the hydrophobicity of microporous structure; at the same time, an anti-settling agent polyamide wax powder is added. This agent not only has anti-settling function, but also has certain hydrophobicity and migration characteristics. When it migrates to the material surface, it can give the product excellent hydrophobic properties, thereby significantly enhancing the product's durability.

[0047] (3) The preparation method of the present invention is scientific, reasonable, simple and easy to implement, and suitable for industrial production. Detailed Implementation

[0048] The present invention will be further described below with reference to the embodiments and comparative examples. Unless otherwise specified, the raw materials used in the embodiments and comparative examples are all conventional commercial raw materials, and the process methods used are all conventional methods in the art unless otherwise specified.

[0049] Example 1

[0050] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0051] Component A:

[0052] SEP-560S: 10.5 copies;

[0053] VORAPEL D3201: 24.5 copies;

[0054] MOCA: 9 copies;

[0055] Chlorinated palm oil methyl ester: 20 parts;

[0056] Silane-modified 400-mesh talc: 25.5 parts;

[0057] Synthetic iron oxide green: 7 parts;

[0058] M6686LVE: 1 serving;

[0059] ULTRA: 1 serving;

[0060] Compound catalyst: 1 part;

[0061] Water: 0.3 parts;

[0062] B-455: 0.2 copies;

[0063] Component B:

[0064] SEP-560S: 22 copies;

[0065] PTMG 2000: 33 copies;

[0066] MDI-50: 40 servings;

[0067] Antioxidant 1010: 3 parts;

[0068] UV-320: 2 portions;

[0069] The composite catalyst used is a mixture of bismuth isooctanoate, zirconium isooctanoate and amine foaming catalyst (MAYCAT RA1), with a mass ratio of 2:1:3.

[0070] Group A Allocation Process:

[0071] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA were added at 60°C. The temperature was raised to 95°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), the compound catalyst, M6686LVE, water, and B-455 were added and stirred until homogeneous to obtain component A.

[0072] Group B allocation process:

[0073] Add MDI-50 to the reactor, start stirring, add SEP-560S and PTMG 2000 at 40℃, raise the temperature to 72℃ and keep it at that temperature for 2.5h, then add UV-320 and antioxidant 1010, keep the temperature at 72℃ and react. Take a sample to test the -NCO content. The -NCO is qualified. The qualified standard for -NCO is 11.1%, which is the result of component B.

[0074] Mix component A and component B evenly at a mass ratio of 3:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0075] Example 2

[0076] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0077] Component A:

[0078] SEP-560S: 12 copies;

[0079] VORAPEL D3201: 28 copies;

[0080] MOCA: 7 copies;

[0081] Chlorinated palm oil methyl ester: 15 parts;

[0082] Silane-modified 400-mesh talc: 26.8 parts;

[0083] Synthetic iron oxide green: 5 parts;

[0084] M6686LVE: 0.9 parts;

[0085] ULTRA: 4 servings;

[0086] Compound catalyst: 0.8 parts;

[0087] Water: 0.2 parts;

[0088] B-455: 0.2 copies;

[0089] Component B:

[0090] SEP-560S: 24 copies;

[0091] PTMG 2000: 36 copies;

[0092] MDI-50: 34 servings;

[0093] Antioxidant 1010: 3 parts;

[0094] UV-320: 3 copies;

[0095] The composite catalyst used is a mixture of bismuth isooctanoate, zirconium isooctanoate and amine foaming catalyst (MAYCAT RA1), with a mass ratio of 2:1:3.

[0096] Group A Allocation Process:

[0097] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA were added at 65°C. The temperature was raised to 100°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), the compound catalyst, M6686LVE, water, and B-455 were added and stirred until homogeneous to obtain component A.

[0098] Group B allocation process:

[0099] Add MDI-50 to the reactor, start stirring, add SEP-560S and PTMG 2000 at 45℃, raise the temperature to 75℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 75℃ for the reaction. Take a sample to test the -NCO content. The -NCO is qualified, and the qualified standard for -NCO is 9.5%, thus obtaining component B.

[0100] Mix component A and component B evenly at a mass ratio of 3:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0101] Example 3

[0102] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0103] Component A:

[0104] SEP-560S: 13.5 copies;

[0105] VORAPEL D3201: 31.5 copies;

[0106] MOCA: 5 copies;

[0107] Chlorinated palm oil methyl ester: 15 parts;

[0108] Silane-modified 400-mesh talc: 23.7 parts;

[0109] Synthetic iron oxide green: 5 parts;

[0110] M6686LVE: 0.5 parts;

[0111] ULTRA: 5 servings;

[0112] Compound catalyst: 0.5 parts;

[0113] Water: 0.2 parts;

[0114] B-455: 0.1 copies;

[0115] Component B:

[0116] SEP-560S: 26 copies;

[0117] PTMG 2000: 39 copies;

[0118] MDI-50: 30 servings;

[0119] Antioxidant 1010: 2 parts;

[0120] UV-320: 3 copies;

[0121] The composite catalyst used is a mixture of bismuth isooctanoate, zirconium isooctanoate and amine foaming catalyst (MAYCAT RA1), with a mass ratio of 2:1:2.5.

[0122] Group A Allocation Process:

[0123] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA were added at 70°C. The temperature was raised to 95°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), the compound catalyst, M6686LVE, water, and B-455 were added and stirred until homogeneous to obtain component A.

[0124] Group B allocation process:

[0125] Add MDI-50 to the reactor, start stirring, add SEP-560S and PTMG 2000 at 50℃, raise the temperature to 78℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 78℃ for the reaction. Take a sample to test the -NCO content. The -NCO is qualified, and the qualified standard for -NCO is 7.35%, thus obtaining component B.

[0126] Mix component A and component B evenly at a mass ratio of 2.5:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0127] Comparative Example 1

[0128] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0129] Component A:

[0130] MN-3050: 10.5 servings;

[0131] DL-2000: 24.5 copies;

[0132] MOCA: 9 copies;

[0133] Chlorinated palm oil methyl ester: 20 parts;

[0134] Silane-modified 400-mesh talc: 25.5 parts;

[0135] Synthetic iron oxide green: 7 parts;

[0136] M6686LVE: 1 serving;

[0137] ULTRA: 1 serving;

[0138] Compound catalyst: 1 part;

[0139] Water: 0.3 parts;

[0140] B-455: 0.2 copies;

[0141] Component B:

[0142] MN-3050: 22 doses;

[0143] PTMG 2000: 33 copies;

[0144] MDI-50: 40 servings;

[0145] Antioxidant 1010: 3 parts;

[0146] UV-320: 2 portions;

[0147] The composite catalyst used is a mixture of bismuth isooctanoate, zirconium isooctanoate and amine foaming catalyst (MAYCAT RA1), with a mass ratio of 2:1:3.

[0148] Group A Allocation Process:

[0149] Add MN-3050, DL-2000, and methyl chloropalmitate to a reactor and start stirring. At 60°C, add MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA. Raise the temperature to 95°C and dehydrate under vacuum. After the moisture content is tested and found to be within acceptable limits (≤0.03%), add the compound catalyst, M6686LVE, water, and B-455. Stir until homogeneous to obtain component A.

[0150] Group B allocation process:

[0151] Add MDI-50 to the reactor, start stirring, add MN-3050 and PTMG 2000 at 40℃, raise the temperature to 72℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 72℃ for the reaction. Take a sample to test the -NCO content. The -NCO content is qualified. The qualified standard for -NCO is 11.1%, which yields component B.

[0152] Mix component A and component B evenly at a mass ratio of 3:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0153] Comparative Example 2

[0154] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0155] Component A:

[0156] SEP-560S: 12 copies;

[0157] VORAPEL D3201: 28 copies;

[0158] MOCA: 7 copies;

[0159] Chlorinated palm oil methyl ester: 15 parts;

[0160] Silane-modified 400-mesh talc: 26.8 parts;

[0161] Synthetic iron oxide green: 5 parts;

[0162] M6686LVE: 0.9 parts;

[0163] ULTRA: 4 servings;

[0164] Bismuth isooctanoate: 0.8 parts;

[0165] Water: 0.2 parts;

[0166] B-455: 0.3 copies;

[0167] Component B:

[0168] SEP-560S: 24 copies;

[0169] PTMG 2000: 36 copies;

[0170] MDI-50: 34 servings;

[0171] Antioxidant 1010: 3 parts;

[0172] UV-320: 3 copies;

[0173] Group A Allocation Process:

[0174] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA were added at 65°C. The temperature was raised to 100°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), bismuth isooctanoate, M6686LVE, water, and B-455 were added and stirred until homogeneous to obtain component A.

[0175] Group B allocation process:

[0176] Add MDI-50 to the reactor, start stirring, add SEP-560S and PTMG 2000 at 45℃, raise the temperature to 75℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 75℃ for the reaction. Take a sample to test the -NCO content. The -NCO content is qualified. The qualified standard for -NCO is 8.9%, which yields component B.

[0177] Mix component A and component B evenly at a mass ratio of 3:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0178] Comparative Example 3

[0179] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0180] Component A:

[0181] SEP-560S: 12 copies;

[0182] VORAPEL D3201: 28 copies;

[0183] MOCA: 7 copies;

[0184] Chlorinated palm oil methyl ester: 15 parts;

[0185] Silane-modified 400-mesh talc: 26.8 parts;

[0186] Synthetic iron oxide green: 5 parts;

[0187] M6686LVE: 0.9 parts;

[0188] ULTRA: 4 servings;

[0189] MAYCAT RA1: 0.8 parts;

[0190] Water: 0.2 parts;

[0191] B-455: 0.3 copies;

[0192] Component B:

[0193] SEP-560S: 24 copies;

[0194] PTMG 2000: 36 copies;

[0195] MDI-50: 34 servings;

[0196] Antioxidant 1010: 3 parts;

[0197] UV-320: 3 copies;

[0198] Group A Allocation Process:

[0199] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA were added at 65°C. The temperature was raised to 100°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), MAYCAT RA1, M6686LVE, water, and B-455 were added and stirred until homogeneous to obtain component A.

[0200] Group B allocation process:

[0201] Add MDI-50 to the reactor, start stirring, add SEP-560S and PTMG 2000 at 45℃, raise the temperature to 75℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 75℃ for the reaction. Take a sample to test the -NCO content. The -NCO content is qualified. The qualified standard for -NCO is 8.9%, which yields component B.

[0202] Mix component A and component B evenly at a mass ratio of 3:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0203] Comparative Example 4

[0204] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0205] Component A:

[0206] SEP-560S: 13.5 copies;

[0207] VORAPEL D3201: 31.5 copies;

[0208] MOCA: 5 copies;

[0209] Chlorinated palm oil methyl ester: 15 parts;

[0210] Silane-modified 400-mesh talc: 23.7 parts;

[0211] Synthetic iron oxide green: 5 parts;

[0212] M6686LVE: 0.5 parts;

[0213] ULTRA: 5 servings;

[0214] Compound catalyst: 0.5 parts;

[0215] Water: 0.2 parts;

[0216] B-455: 0.1 copies;

[0217] Component B:

[0218] SEP-560S: 26 copies;

[0219] DL-2000: 39 copies;

[0220] MDI-50: 30 servings;

[0221] Antioxidant 1010: 2 parts;

[0222] UV-320: 3 copies;

[0223] The composite catalyst used is a mixture of bismuth isooctanoate, zirconium isooctanoate and amine foaming catalyst (MAYCAT RA1), with a mass ratio of 2:1:2.5.

[0224] Group A Allocation Process:

[0225] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA were added at 70°C. The temperature was raised to 95°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), the compound catalyst, M6686LVE, water, and B-455 were added and stirred until homogeneous to obtain component A.

[0226] Group B allocation process:

[0227] Add MDI-50 to the reactor, start stirring, add SEP-560S and DL-2000 at 50℃, raise the temperature to 78℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 78℃ for the reaction. Take a sample to test the -NCO content. The -NCO is qualified, and the qualified standard for -NCO is 7.35%, thus obtaining component B.

[0228] Mix component A and component B evenly at a mass ratio of 2.5:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0229] Comparative Example 5

[0230] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0231] Component A:

[0232] SEP-560S: 13.5 copies;

[0233] VORAPEL D3201: 31.5 copies;

[0234] MOCA: 5 copies;

[0235] Chlorinated palm oil methyl ester: 15 parts;

[0236] Silane-modified 400-mesh talc: 23.7 parts;

[0237] Synthetic iron oxide green: 5 parts;

[0238] M6686LVE: 0.5 parts;

[0239] Fumed silica: 5 parts;

[0240] Compound catalyst: 0.5 parts;

[0241] Water: 0.2 parts;

[0242] B-455: 0.1 copies;

[0243] Component B:

[0244] SEP-560S: 26 copies;

[0245] PTMG 2000: 39 copies;

[0246] MDI-50: 30 servings;

[0247] Antioxidant 1010: 2 parts;

[0248] UV-320: 3 copies;

[0249] The composite catalyst used is a mixture of bismuth isooctanoate, zirconium isooctanoate and amine foaming catalyst (MAYCAT RA1), with a mass ratio of 2:1:2.5.

[0250] Group A Allocation Process:

[0251] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and fumed silica were added at 70°C. The temperature was raised to 95°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), the compound catalyst, M6686LVE, water, and B-455 were added and stirred until homogeneous to obtain component A.

[0252] Group B allocation process:

[0253] Add MDI-50 to the reactor, start stirring, add SEP-560S and PTMG 2000 at 50℃, raise the temperature to 78℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 78℃ for the reaction. Take a sample to test the -NCO content. The -NCO is qualified, and the qualified standard for -NCO is 7.35%, thus obtaining component B.

[0254] Mix component A and component B evenly at a mass ratio of 2.5:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0255] Comparative Example 6

[0256] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0257] Component A:

[0258] SEP-560S: 12 copies;

[0259] VORAPEL D3201: 28 copies;

[0260] MOCA: 7 copies;

[0261] Chlorinated palm oil methyl ester: 15 parts;

[0262] Silane-modified 400-mesh talc: 27 parts;

[0263] Synthetic iron oxide green: 5 parts;

[0264] M6686LVE: 0.9 parts;

[0265] ULTRA: 4 servings;

[0266] Compound catalyst: 0.8 parts;

[0267] Water: 0.2 parts;

[0268] Component B:

[0269] SEP-560S: 24 copies;

[0270] PTMG 2000: 36 copies;

[0271] MDI-50: 34 servings;

[0272] Antioxidant 1010: 3 parts;

[0273] UV-320: 3 copies;

[0274] The composite catalyst used is a mixture of bismuth isooctanoate, zirconium isooctanoate and amine foaming catalyst (MAYCAT RA1), with a mass ratio of 2:1:3.

[0275] Group A Allocation Process:

[0276] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA were added at 65°C. The temperature was raised to 100°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), the compound catalyst, M6686LVE, and water were added and stirred until homogeneous to obtain component A.

[0277] Group B allocation process:

[0278] Add MDI-50 to the reactor, start stirring, add SEP-560S and PTMG 2000 at 45℃, raise the temperature to 75℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 75℃ for the reaction. Take a sample to test the -NCO content. The -NCO is qualified, and the qualified standard for -NCO is 9.5%, thus obtaining component B.

[0279] Mix component A and component B evenly at a mass ratio of 3:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0280] Comparative Example 7

[0281] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0282] Component A:

[0283] SEP-560S: 12 copies;

[0284] VORAPEL D3201: 28 copies;

[0285] MOCA: 7 copies;

[0286] Chlorinated palm oil methyl ester: 15 parts;

[0287] Silane-modified 400-mesh talc: 26.8 parts;

[0288] Synthetic iron oxide green: 5 parts;

[0289] M6686LVE: 0.9 parts;

[0290] ULTRA: 4 servings;

[0291] Bismuth isooctanoate: 0.4 parts;

[0292] MAYCAT RA1: 0.4 parts;

[0293] Water: 0.2 parts;

[0294] B-455: 0.2 copies;

[0295] Component B:

[0296] SEP-560S: 24 copies;

[0297] PTMG 2000: 36 copies;

[0298] MDI-50: 34 servings;

[0299] Antioxidant 1010: 3 parts;

[0300] UV-320: 3 copies;

[0301] Group A Allocation Process:

[0302] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA were added at 65°C. The temperature was raised to 100°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), bismuth isooctanoate, MAYCAT RA1, M6686LVE, water, and B-455 were added and stirred until homogeneous to obtain component A.

[0303] Group B allocation process:

[0304] Add MDI-50 to the reactor, start stirring, add SEP-560S and PTMG 2000 at 45℃, raise the temperature to 75℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 75℃ for the reaction. Take a sample to test the -NCO content. The -NCO is qualified, and the qualified standard for -NCO is 9.5%, thus obtaining component B.

[0305] Mix component A and component B evenly at a mass ratio of 3:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0306] Comparative Example 8

[0307] The aforementioned two-component hydrophobic microfoamed self-skinning polyurethane sports court material is formulated from two components, A and B, wherein...

[0308] Component A:

[0309] SEP-560S: 12 copies;

[0310] VORAPEL D3201: 28 copies;

[0311] MOCA: 7 copies;

[0312] Chlorinated palm oil methyl ester: 15 parts;

[0313] Silane-modified 400-mesh talc: 26.8 parts;

[0314] Synthetic iron oxide green: 5 parts;

[0315] M6686LVE: 0.9 parts;

[0316] ULTRA: 4 servings;

[0317] Bismuth isooctanoate: 0.1 parts;

[0318] Zirconium isooctanoate: 0.05 parts;

[0319] MAYCAT RA1: 0.65 parts;

[0320] Water: 0.2 parts;

[0321] B-455: 0.2 copies;

[0322] Component B:

[0323] SEP-560S: 24 copies;

[0324] PTMG 2000: 36 copies;

[0325] MDI-50: 34 servings;

[0326] Antioxidant 1010: 3 parts;

[0327] UV-320: 3 copies;

[0328] Group A Allocation Process:

[0329] SEP-560S, VORAPEL D3201, and methyl chloropalmitate were added to a reactor and stirred. MOCA, silane-modified 400-mesh talc, synthetic iron oxide green, and ULTRA were added at 65°C. The temperature was raised to 100°C, and the mixture was dehydrated under vacuum. After the moisture content was tested and found to be within acceptable limits (≤0.03%), bismuth isooctanoate, zirconium isooctanoate, MAYCAT RA1, M6686LVE, water, and B-455 were added and stirred until homogeneous to obtain component A.

[0330] Group B allocation process:

[0331] Add MDI-50 to the reactor, start stirring, add SEP-560S and PTMG 2000 at 45℃, raise the temperature to 75℃ and keep it at that temperature for 2.5 hours, then add UV-320 and antioxidant 1010, and keep the temperature at 75℃ for the reaction. Take a sample to test the -NCO content. The -NCO is qualified, and the qualified standard for -NCO is 9.5%, thus obtaining component B.

[0332] Mix component A and component B evenly at a mass ratio of 3:1, spread the mixture to an 8mm thickness, and allow it to mature at room temperature for 2 days to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports court material.

[0333] The physical properties of the finished products obtained in Examples 1-3 and Comparative Examples 1-8 were tested, and the test results are shown in Table 1.

[0334] Test method:

[0335] Density: Tested according to GB / T 6343-2009;

[0336] Tensile strength, elongation at break, impact absorption, and vertical deformation: tested in accordance with GB 36246-2018;

[0337] Water absorption rate: Tested in accordance with GB / T 8810-2005.

[0338] Table 1 Physical performance test results

[0339]

[0340] As shown in Table 1, the finished product obtained by this invention exhibits significant advantages in physical properties. Comparative Example 1 demonstrates that the hydrophobic polyether polyol and EO / PO copolymer polyether triol not only significantly improve the hydrophobicity of the material but also ensure the stability of the foaming agent in the system. Comparative Example 5 shows that the polyamide wax powder alters the wettability of the material's substrate, significantly enhancing its hydrophobic properties. Comparative Examples 2, 3, and 6 demonstrate that through formulation design, combined with a compound catalyst and B-455, a self-skinning material with thick skin, high strength, and good wear resistance is obtained. Its impact absorption and vertical deformation performance are superior to similar products, and its construction is simple and efficient, providing athletes with a more comfortable sports environment. Comparative Examples 7 and 8 show that bismuth isooctanoate, zirconium isooctanoate, and amine foaming catalyst must be compounded in a ternary ratio of 2:1:(2.5-3) to achieve a dynamic balance between gelation and foaming, ultimately obtaining a self-skinning polyurethane court material with excellent comprehensive performance. The absence of any component or deviation in the ratio will lead to problems such as surface skinning defects, decreased mechanical properties, and imbalanced sports performance.

Claims

1. A two-component hydrophobic microfoamed self-skinning polyurethane sports court material, characterized in that: It is prepared from two components, A and B, in a mass ratio of (2.5–3):1, wherein, Component A comprises the following raw materials in parts by weight: Polyether polyol A: 10.5–13.5 parts; Polyether polyol B: 24.5–31.5 parts; Chain extender: 5-9 parts; Plasticizer: 15-20 parts; Filler: 20-30 parts; Pigment: 5-7 parts; Foam stabilizer: 0.5–1 part; Anti-settling agent: 1-5 parts; Compound catalyst: 0.5–1 part; Water: 0.2–0.3 parts; Defoamer: 0.1–0.2 parts; Component B comprises the following parts by mass of raw materials: Polyether polyol A: 22-26 parts; Polyether polyol C: 33-39 parts; Isocyanate: 30-40 parts; Antioxidant: 1-3 parts; UV absorber: 1-3 parts; The polyether polyol A is an EO / PO copolymer polyether triol; the polyether polyol B is a hydrophobic polyether polyol; the polyether polyol C is polytetramethylene ether diol; the compound catalyst is a mixture of bismuth isooctanoate, zirconium isooctanoate and MAYCAT RA1, with a mass ratio of 2:1:(2.5-3); and the anti-settling agent is polyamide wax powder.

2. The two-component hydrophobic microfoamed self-skinning polyurethane sports court material according to claim 1, characterized in that: The polyether polyol A has a functionality of 3 and a number-average molecular weight of 3000; the polyether polyol B has a functionality of 2 and a number-average molecular weight of 2000; and the polyether polyol C has a functionality of 2 and a number-average molecular weight of 2000.

3. The two-component hydrophobic microfoamed self-skinning polyurethane sports court material according to claim 1, characterized in that: The chain extender is 4,4'-methylenebis(2-chloroaniline).

4. The two-component hydrophobic microfoamed self-skinning polyurethane sports court material according to claim 1, characterized in that: The plasticizer is chloropalmitoyl palmitate.

5. The two-component hydrophobic microfoamed self-skinning polyurethane sports court material according to claim 1, characterized in that: The filler is silane-modified 400-mesh talc powder; the pigment is iron oxide green.

6. The two-component hydrophobic microfoamed self-skinning polyurethane sports court material according to claim 1, characterized in that: The foam stabilizer mentioned is M6686LVE.

7. The two-component hydrophobic microfoamed self-skinning polyurethane sports court material according to claim 1, characterized in that: The defoamer mentioned is an oil-based non-silicone defoamer, B-455.

8. The two-component hydrophobic microfoamed self-skinning polyurethane sports court material according to claim 1, characterized in that: The isocyanate mentioned is diphenylmethane diisocyanate.

9. The two-component hydrophobic microfoamed self-skinning polyurethane sports court material according to claim 1, characterized in that: The antioxidant is antioxidant 1010, and the ultraviolet absorber is UV-320.

10. A method for preparing a two-component hydrophobic microfoamed self-skinning polyurethane sports court material according to any one of claims 1-9, characterized in that: Includes the following steps: (1) Preparation of component A: Polyether polyol A, polyether polyol B and plasticizer are put into the reactor and stirred. Chain extender, filler, pigment and anti-settling agent are added at 60-70℃. The temperature is raised to 95-100℃. After vacuum dehydration, compound catalyst, foam stabilizer, water and defoamer are added and stirred evenly to obtain component A. (2) Component B preparation: Isocyanate is added to the reactor, stirring is started, polyether polyol A and polyether polyol C are added at 40-50℃, the temperature is raised to 72-78℃, the temperature is maintained, ultraviolet absorber and antioxidant are added, the temperature is maintained at 72-78℃ for reaction, and the -NCO mass content is measured to be 7.3-11.2% to obtain component B; (3) Mix component A and component B evenly, spread them out, and allow them to mature to obtain a two-component hydrophobic micro-foamed self-skinning polyurethane sports field material.

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