Room temperature curing environment-friendly polyurethane foaming sports field material as well as preparation method and application thereof

Abstract

The invention discloses a room-temperature curing environment-friendly polyurethane foaming sports field material as well as a preparation method and application thereof. The material is a double-component polyurethane foaming material, and a component A comprises an anti-settling environment-friendly plasticizer, modified bio-based polyol, bifunctional polyether polyol, an environment-friendly chain extender, a coloring agent, an ultraviolet absorbent, an antioxidant, talcum powder, water, a catalyst, a foam stabilizer and a thixotropic agent; the component B comprises high-functionality polyether polyol, bifunctionality polyether polyol, modified bio-based polyol, an environment-friendly plasticizer, diphenylmethane diisocyanate or a modifier thereof, an ultraviolet absorbent, an antioxidant and a dehydrating agent. The material is free of organic volatile matters and halogen and does not need an external solvent for construction; the elasticity is excellent, the damping effect is good, and aging resistance is achieved.

Description

Technical Field

[0001] This invention belongs to the field of polyurethane sports field elastic materials technology, and specifically relates to a room temperature curing environmentally friendly polyurethane foam sports field material, its preparation method and application. Background Art

[0002] Using foamed materials in synthetic running tracks has several advantages: it reduces material usage, lowers costs, and aligns with energy conservation and emission reduction principles; it provides good shock absorption and cushioning, reducing the impact on athletes and lowering the risk of sports injuries; its softness and elasticity offer a more comfortable running experience, reducing pressure on joints and muscles; it typically has good anti-slip properties, providing better grip and reducing the risk of slipping; and it generally boasts good durability, withstanding prolonged use and frequent wear.

[0003] Currently, the polyurethane foam or non-foamed running track materials used in the market employ chlorine-containing plasticizers and halogen-containing chain extenders as raw materials. Not only is their environmental friendliness questionable, but the high halogen content also has a negative effect on polyurethane by promoting molecular chain scission. Furthermore, they may contain solvents or require the addition of solvents during construction to facilitate construction, further compromising their environmental friendliness. Summary of the Invention

[0004] The primary objective of this invention is to overcome the shortcomings and deficiencies of existing technologies and provide a room-temperature curing, environmentally friendly polyurethane foam sports field material. This material is free of halogenated plasticizers, free of carcinogenic MOCA chain extenders, and requires no external solvents for application.

[0005] Another objective of this invention is to provide a method for preparing the above-mentioned room temperature curing environmentally friendly polyurethane foam sports field material.

[0006] Another object of the present invention is to provide the application of the above-mentioned room temperature curing environmentally friendly polyurethane foam sports field material.

[0007] The objective of this invention is achieved through the following technical solution: a room temperature curing environmentally friendly polyurethane foam sports field material, comprising component A and component B;

[0008] Component A comprises the following components by weight: 10-20 parts of anti-settling environmentally friendly plasticizer, 40-50 parts of modified bio-based polyol, 10-20 parts of difunctional polyether polyol, 2-4 parts of environmentally friendly chain extender, 1-3 parts of colorant, 1-3 parts of UV absorber, 1-3 parts of antioxidant, 10-20 parts of talc, 0.05-0.25 parts of water, 0.05-0.15 parts of catalyst, 0.1-0.5 parts of foam stabilizer, and 0.3-0.8 parts of thixotropic agent; preferably, it comprises the following components by weight: 15 parts of anti-settling environmentally friendly plasticizer, 45 parts of modified bio-based polyol, 15 parts of difunctional polyether polyol, 3 parts of environmentally friendly chain extender, 2 parts of colorant, 2 parts of UV absorber, 2 parts of antioxidant, 15 parts of talc, 0.1 parts of water, 0.1 parts of catalyst, 0.3 parts of foam stabilizer, and 0.5 parts of thixotropic agent;

[0009] Component B comprises the following components by weight: 3-8 parts of high-functionality polyether polyol, 15-25 parts of difunctional polyether polyol, 15-25 parts of modified bio-based polyol, 3-8 parts of environmentally friendly plasticizer, 40-50 parts of diphenylmethane diisocyanate or its modified form, 1-3 parts of UV absorber, 1-3 parts of antioxidant, and 1-2 parts of dehydrating agent; preferably, it comprises the following components by weight: 5 parts of high-functionality polyether polyol, 20 parts of difunctional polyether polyol, 20 parts of modified bio-based polyol, 5 parts of environmentally friendly plasticizer, 45 parts of diphenylmethane diisocyanate or its modified form, 2 parts of UV absorber, 2 parts of antioxidant, and 1 part of dehydrating agent.

[0010] The aforementioned anti-settling environmentally friendly plasticizer is preferably prepared through the following steps:

[0011] ① After the environmentally friendly plasticizer is vacuum dehydrated at 100-110℃, the dehydrating agent and fumed silica are added under inert gas protection at 50-70℃ with stirring, and the mixture is stirred for 30-120 minutes.

[0012] ② Next, add the crosslinking agent at 35-45℃ while stirring, and stir and react for 1-3 hours under inert gas protection and sealing. Then, raise the temperature to 60-80℃ and evacuate for 2-4 hours. After the reaction is completed, cool down to obtain the anti-settling environmentally friendly plasticizer. The environmentally friendly plasticizer, dehydrating agent, fumed silica and crosslinking agent are mixed in a mass ratio of 90:1-3:6-8:0.5-1.5.

[0013] The environmentally friendly plasticizer mentioned in step ① is preferably at least one of epoxidized soybean oil, tributyl citrate, acetylated tributyl citrate, diacetylated epoxidized vegetable oleate glyceryl ester, and trioctyl citrate.

[0014] The preferred temperature for dehydration in step ① is 105℃.

[0015] The dehydration time in step ① is preferably 2 to 4 hours; more preferably 3 hours.

[0016] The inert gas mentioned in step ① is preferably nitrogen.

[0017] The dehydrating agent mentioned in step ① is preferably dehydrating agent BF-5.

[0018] The stirring reaction time in step ① is preferably 30 to 90 minutes; more preferably 60 minutes.

[0019] The crosslinking agent mentioned in step ② is preferably dichlorodimethylsilane.

[0020] The preferred reaction conditions in step ② are as follows: stirring reaction for 2 hours under inert gas protection and sealing, heating to 70°C, and vacuuming for 3 hours.

[0021] The preferred degree of cooling in step ② is cooling to room temperature.

[0022] The modified bio-based polyol is preferably a modified bio-based polyol with an average hydroxyl value of 100-200 KOH / G and a viscosity of 1000-2000 CPS at 25°C; more preferably, it is at least one of cashew nut shell oil phenolic resin polyol and cashew oil polyol, with an average hydroxyl value of 100-175 KOH / G and a viscosity of 1000-2000 CPS at 25°C.

[0023] The bifunctional polyether polyol is preferably a polyoxypropylene ether diol; more preferably a polyoxypropylene ether diol with a molecular weight of 400 to 4000.

[0024] The environmentally friendly chain extender refers to a halogen-free chain extender; preferably, it is at least one of 1,4-butanediol, glycerol, polyetheramine T403, trimethylolpropane, and ethyleneimine.

[0025] The preferred colorant is iron oxide red.

[0026] The ultraviolet absorber is preferably UV531 ultraviolet absorber.

[0027] The antioxidant is preferably at least one of antioxidant 1010 and antioxidant 168.

[0028] The talc powder is preferably 600-1000 mesh talc powder; more preferably 800 mesh talc powder.

[0029] The water is preferably deionized water, distilled water, or purified water.

[0030] The catalyst is preferably a catalyst obtained by combining at least one of N,N-dimethylcyclohexylamine, 1,8-diazabicycloundec-7-ene, N,N,N'-trimethyl-N'-hydroxyethylethylenediamine and 1,5-diazabicyclo[4.3.0]non-5-ene with a bismuth catalyst.

[0031] The bismuth catalyst is preferably at least one of bismuth isooctanoate, bismuth neodecanoate, and bismuth naphthenate.

[0032] The foam leveling agent is preferably a silicone foam leveling agent; more preferably a non-hydrolyzable silicone soft foam leveling agent.

[0033] The thixotropic agent is preferably a rheology modifier with anti-sagging and anti-settling properties; more preferably, it is BYK-410 or ASA 410DM-50.

[0034] The high-functional polyether polyol is a trifunctional polyether polyol; more preferably, it is a polyether polyol with a functionality of 3 and a molecular weight of 4000-6000.

[0035] The diphenylmethane diisocyanate or its modified form is preferably MDI-50 or carbodiimide-modified MDI.

[0036] The environmentally friendly plasticizers mentioned are epoxidized soybean oil, tributyl citrate, acetylated tributyl citrate, diacetylepoxidized vegetable oil glyceryl ester, and trioctyl citrate.

[0037] The preparation method of the above-mentioned room temperature curing environmentally friendly polyurethane foam sports field material includes the following steps:

[0038] (1) Preparation of component A:

[0039] A. Stir the modified bio-based polyol, difunctional polyether polyol and environmentally friendly chain extender at 60-80℃ until homogeneous; then add the colorant, UV absorber, antioxidant and talc and stir until homogeneous.

[0040] B. After cooling the product obtained in step A to 45-55°C, add water, catalyst, foaming agent and thixotropic agent while stirring, and stir to react.

[0041] C. Add an anti-settling environmentally friendly plasticizer to the product obtained in step B, stir and react, then let stand to obtain component A;

[0042] (2) Preparation of component B:

[0043] A. Stir the high-functionality polyether polyol, the difunctional polyether polyol, the modified bio-based polyol and the environmentally friendly plasticizer evenly, and dehydrate them under vacuum at 100-110℃ for 2-4 hours.

[0044] (2) Cool the product obtained in step A to 65-75°C, add diphenylmethane diisocyanate or its modified form, and react at 55-65°C for 50-70 min under an inert atmosphere; then raise the temperature twice, each time by 8-12°C, for 50-70 min; after the reaction is complete, cool to 55-65°C and add UV absorber, antioxidant and dehydrating agent, continue to mix evenly under an inert gas atmosphere, and let stand to obtain component B.

[0045] The application of the above-mentioned room temperature curing environmentally friendly polyurethane foam sports field material in the preparation of environmentally friendly polyurethane foam sports fields preferably includes the following steps: after mixing component A and component B evenly at a mass ratio of 1:1, construction can proceed.

[0046] The present invention has the following advantages and effects compared with the prior art:

[0047] This invention utilizes low-viscosity, environmentally friendly, halogen-free plasticizers, halogen-free chain extenders, delayed amine catalysts, and thermosensitive catalysts to achieve room-temperature curing, environmentally friendly polyurethane foam sports field materials. These materials exhibit excellent elasticity, good shock absorption, and aging resistance. The product contains no volatile organic compounds, is halogen-free, and requires no external solvents for application, exceeding the requirements of the national standard GB36246-2018. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to embodiments, but the embodiments of the present invention are not limited thereto. All parts referred to below are parts by weight.

[0049] Reagents involved:

[0050] Fumed silica, model AEROSIL R816, Degussa;

[0051] Cashew nut shell oil phenolic resin polyol, model LITE 9001, Cardley Chemical (Zhuhai) Co., Ltd., average hydroxyl value 175KOH / G, viscosity at 25℃ 2000CPS;

[0052] Cashew nut shell oil phenolic resin polyol, model NX-9001, Cardley Chemical (Zhuhai) Co., Ltd., average hydroxyl value 175KOH / G, viscosity at 25℃ 2000CPS;

[0053] Cashew nut shell oil phenolic resin polyol, model NX-9001LV, Cardley Chemical (Zhuhai) Co., Ltd., average hydroxyl value 175KOH / G, viscosity at 25℃ 1000CPS;

[0054] Cashew nut shell oil polyester diol, model NX-9203LP, Cardley Chemical (Zhuhai) Co., Ltd., average hydroxyl value 100KOH / G, viscosity at 25℃ 2000CPS;

[0055] Polyoxypropylene ether diol, model DL-2000D, Shandong Lanxing Dongda Co., Ltd., molecular weight 400-4000;

[0056] Polyether polyol, model EP-330NG, Shandong Lanxing Dongda Co., Ltd.; functionality 3, molecular weight 5000;

[0057] Silicone foam stabilizer, model G-595, Dongguan Guangsiyuan Polyurethane Materials Co., Ltd.;

[0058] Thixotropic agent, model BYK410, BYK Chemicals;

[0059] MDI50 is a mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate, model number MI, BASF (China) Co., Ltd.

[0060] Carbodiimide-urea ketimide modified 4,4'-diphenylmethane diisocyanate, model MDI-100LL, Yantai Wanhua Group.

[0061] Example 1

[0062] 1. Preparation of component A:

[0063] (1) 90 parts of tributyl citrate were added to the reactor. The material was heated to 105°C and dehydrated under vacuum for 3 hours. Under nitrogen protection, the temperature was lowered to 60°C. Under stirring, 2 parts of dehydrating agent BF-5 were added dropwise, followed by 7 parts of fumed silica (model AEROSIL R816). The mixture was stirred for 1 hour and then cooled to 40°C. Under nitrogen protection, 1 part of dichlorodimethylsilane was added dropwise. The mixture was stirred and reacted under nitrogen protection and sealed for 2 hours. The temperature was raised to 70°C and evacuated for 3 hours. The temperature was then lowered to 30°C to obtain an anti-settling environmentally friendly plasticizer for later use.

[0064] (2) Add 45 parts of modified bio-based polyol (model LITE 9001), 15 parts of polyether polyol (model DL-2000D), 2 parts of 1,4-butanediol and 1 part of trimethylolpropane into the reactor, heat to 70°C and stir evenly.

[0065] (3) Add 2 parts of iron oxide red, 2 parts of UV531 ultraviolet absorber, 2 parts of 1010 antioxidant and 15 parts of 800 mesh talc powder to the reaction vessel of step (2), stir for 30 minutes and cool down to 50°C.

[0066] (4) Add 0.1 parts deionized water, 0.05 parts bismuth neodecanoate, 0.05 parts N,N-dimethylcyclohexylamine, and foaming agent (model) 0.3 parts of G-595 and 0.5 parts of thixotropic agent (BYK410, BYK Chemical) were added to the reactor in step (3) in sequence under stirring and stirred for 30 minutes.

[0067] (5) Add 15 parts of the anti-settling environmentally friendly plasticizer prepared in step (1) into the reaction vessel in step (4) and stir for 30 minutes; after stopping stirring, let stand for 30 minutes to obtain component A for later use.

[0068] 2. Preparation method of component B:

[0069] (1) Add 5 parts of polyether polyol (model EP-330NG), 20 parts of polyether polyol (model DL-2000D), 20 parts of modified bio-based polyol (model LITE 9001) and 5 parts of epoxidized soybean oil into the reactor, stir evenly, heat the obtained material to 105℃, dehydrate under vacuum for 3 hours, and then cool down to 70℃.

[0070] (2) Add 45 parts of MDI-50 (model MI), and stir at 60°C for 1 hour under nitrogen protection;

[0071] (3) Heat the material to 70°C and stir for 1 hour under nitrogen protection.

[0072] (4) Heat the material to 80°C and stir for 1 hour under nitrogen protection.

[0073] (5) Cool the material down to below 60°C, add 2 parts of UV531 ultraviolet absorber, 2 parts of 1010 antioxidant and 1 part of BF-5 dehydrating agent, stir for 30 minutes under nitrogen protection, stop stirring and let stand for 30 minutes to obtain component B for later use.

[0074] 3. Mix components A and B at a mass ratio of 1:1, apply the mixture to a clean, dry glass plate, cure at room temperature, and leave for 7 days. The test results are shown in Table 1.

[0075] Example 2

[0076] 1. Preparation of component A:

[0077] (1) 90 parts of acetylacetic acid tributyl ester were added to the reactor. The material was heated to 105°C and dehydrated under vacuum for 3 hours. Under nitrogen protection, the temperature was lowered to 60°C. Under stirring, 2 parts of dehydrating agent BF-5 were added dropwise, followed by 7 parts of fumed silica (model AEROSIL R816). The mixture was stirred for 1 hour and then cooled to 40°C. Under nitrogen protection, 1 part of dichlorodimethylsilane was added dropwise. The mixture was stirred and reacted under nitrogen protection and sealed for 2 hours. The temperature was raised to 70°C and evacuated for 3 hours. The temperature was then lowered to 30°C to obtain an anti-settling environmentally friendly plasticizer for later use.

[0078] (2) Add 45 parts of modified bio-based polyol (model NX-9001), 15 parts of polyether polyol (model DL-2000D), 1 part of 1,4-butanediol and 2 parts of glycerol into the reaction vessel, heat to 70°C and stir evenly.

[0079] (3) Add 2 parts of iron oxide red, 2 parts of UV531 ultraviolet absorber, 2 parts of 1010 antioxidant and 15 parts of 800 mesh talc powder to the reaction vessel of step (2), stir for 30 minutes and cool down to 50°C.

[0080] (4) Add 0.1 parts deionized water, 0.05 parts bismuth naphthenate, 0.05 parts 1,8-diazabicycloundec-7-ene, and foaming agent (model) 0.3 parts of G-595 and 0.5 parts of thixotropic agent (BYK410) were added to the reactor in step (3) in sequence under stirring, and stirred for 30 minutes.

[0081] (5) Add 15 parts of the anti-settling environmentally friendly plasticizer prepared in step (1) into the reaction vessel in step (4) and stir for 30 minutes; after stopping stirring, let stand for 30 minutes to obtain component A for later use.

[0082] 2. Preparation method of component B:

[0083] (1) Add 5 parts of polyether polyol (model EP-330NG), 20 parts of polyether polyol (model DL-2000D), 20 parts of modified bio-based polyol (model NX-9001) and 5 parts of epoxidized soybean oil into the reactor, stir evenly, heat the obtained material to 105℃, vacuum dehydrate for 3 hours, and then cool down to 70℃.

[0084] (2) Add 45 parts of MDI-50 (model MI), and stir at 60°C for 1 hour under nitrogen protection;

[0085] (3) Heat the material to 70°C and stir for 1 hour under nitrogen protection.

[0086] (4) Heat the material to 80°C and stir for 1 hour under nitrogen protection.

[0087] (5) Cool the material down to below 60°C, add 2 parts of UV531 ultraviolet absorber, 2 parts of 1010 antioxidant and 1 part of BF-5 dehydrating agent, stir for 30 minutes under nitrogen protection, stop stirring and let stand for 30 minutes to obtain component B for later use.

[0088] 3. Mix components A and B at a mass ratio of 1:1, apply the mixture to a clean, dry glass plate, cure at room temperature, and leave for 7 days. The test results are shown in Table 1.

[0089] Example 3

[0090] 1. Preparation of component A:

[0091] (1) 90 parts of diacetylepoxy glyceryl vegetable oil (model HM-828, Guangzhou Haierma Vegetable Oil Co., Ltd.) were added to the reactor. The material was heated to 105°C and dehydrated under vacuum for 3 hours. Under nitrogen protection, the temperature was lowered to 60°C. Under stirring, 2 parts of dehydrating agent BF-5 were added dropwise, followed by 7 parts of fumed silica (model AEROSIL R816). The mixture was stirred for 1 hour and then cooled to 40°C. Under nitrogen protection, 1 part of dichlorodimethylsilane was added dropwise. The mixture was stirred and reacted under nitrogen protection and sealed for 2 hours. The temperature was raised to 70°C and vacuumed for 3 hours. The temperature was then lowered to 30°C to obtain an anti-settling environmentally friendly plasticizer for later use.

[0092] (2) Add 45 parts of modified bio-based polyol (model NX-9001LV), 15 parts of polyether polyol (model DL-2000D), 2 parts of glycerol and 1 part of trimethylolpropane into the reaction vessel, heat to 70°C and stir evenly.

[0093] (3) Add 2 parts of iron oxide red, 2 parts of UV531 ultraviolet absorber, 2 parts of 1010 antioxidant and 15 parts of 800 mesh talc powder to the reaction vessel of step (2), stir for 30 minutes and cool down to 50°C.

[0094] (4) Add 0.1 parts deionized water, 0.05 parts bismuth isooctanoate, 0.05 parts 1,8-diazabicycloundec-7-ene, and foaming agent (model) 0.3 parts of G-595 and 0.5 parts of thixotropic agent (BYK410, BYK Chemical) were added to the reactor in step (3) in sequence under stirring and stirred for 30 minutes.

[0095] (5) Add 15 parts of the anti-settling environmentally friendly plasticizer prepared in step (1) into the reaction vessel in step (4) and stir for 30 minutes; after stopping stirring, let stand for 30 minutes to obtain component A for later use.

[0096] 2. Preparation method of component B:

[0097] (1) Add 5 parts of polyether polyol (model EP-330NG), 20 parts of polyether polyol (model DL-2000D), 20 parts of modified bio-based polyol (model NX-9001LV) and 5 parts of epoxidized soybean oil into the reactor, stir evenly, heat the obtained material to 105℃, dehydrate under vacuum for 3 hours, and then cool down to 70℃.

[0098] (2) Add 45 parts of MDI (model MDI-100LL), and stir at 60°C for 1 hour under nitrogen protection;

[0099] (3) Heat the material to 70°C and stir for 1 hour under nitrogen protection.

[0100] (4) Heat the material to 80°C and stir for 1 hour under nitrogen protection.

[0101] (5) Cool the material down to below 60°C, add 2 parts of UV531 ultraviolet absorber, 2 parts of 1010 antioxidant and 1 part of BF-5 dehydrating agent, stir for 30 minutes under nitrogen protection, stop stirring and let stand for 30 minutes to obtain component B for later use.

[0102] 3. Mix components A and B at a mass ratio of 1:1, apply the mixture to a clean, dry glass plate, cure at room temperature, and leave for 7 days. The test results are shown in Table 1.

[0103] Example 4

[0104] 1. Preparation of component A:

[0105] (1) 90 parts of trioctyl citrate were added to the reactor. The material was heated to 105°C and dehydrated under vacuum for 3 hours. Under nitrogen protection, the temperature was lowered to 60°C. Under stirring, 2 parts of dehydrating agent BF-5 were added dropwise, followed by 7 parts of fumed silica (model AEROSIL R816, Degussa). The mixture was stirred for 1 hour and then cooled to 40°C. Under nitrogen protection, 1 part of dichlorodimethylsilane was added dropwise. The mixture was stirred and reacted under nitrogen protection and sealed for 2 hours. The temperature was raised to 70°C and evacuated for 3 hours. The temperature was then lowered to 30°C to obtain an anti-settling environmentally friendly plasticizer for later use.

[0106] (2) Add 45 parts of modified bio-based polyol (model NX-9203LP), 15 parts of polyether polyol (model DL-2000D), 1 part of 1,4-butanediol, 1 part of ethyleneimine and 1 part of polyetheramine T403 to the reactor, heat to 70°C and stir evenly.

[0107] (3) Add 2 parts of iron oxide red, 2 parts of UV531 ultraviolet absorber, 2 parts of 1010 antioxidant and 15 parts of 800 mesh talc powder to the reaction vessel of step (2), stir for 30 minutes and cool down to 50°C.

[0108] (4) Add 0.1 parts deionized water, 0.05 parts bismuth naphthenate, 0.05 parts N,N,N'-trimethyl-N'-hydroxyethyl ethylenediamine, and foaming agent (model) 0.3 parts of G-595 and 0.5 parts of thixotropic agent (BYK410, BYK Chemical) were added to the reaction vessel in step (3) in sequence under stirring, and stirred for 30 minutes.

[0109] (5) Add 15 parts of the anti-settling environmentally friendly plasticizer prepared in step (1) into the reaction vessel in step (4) and stir for 30 minutes; after stopping stirring, let stand for 30 minutes to obtain component A for later use.

[0110] 2. Preparation method of component B:

[0111] (1) Add 5 parts of polyether polyol (model EP-330NG), 20 parts of polyether polyol (model DL-2000D), 20 parts of modified bio-based polyol (model NX-9203LP) and 5 parts of epoxidized soybean oil into the reactor, stir evenly, heat the obtained material to 105℃, dehydrate under vacuum for 3 hours, and then cool down to 70℃.

[0112] (2) Add 45 parts of MDI (model MDI-100LL), and stir at 60°C for 1 hour under nitrogen protection;

[0113] (3) Heat the material to 70°C and stir for 1 hour under nitrogen protection.

[0114] (4) Heat the material to 80°C and stir for 1 hour under nitrogen protection.

[0115] (5) Cool the material down to below 60°C, add 2 parts of UV531 ultraviolet absorber, 2 parts of 1010 antioxidant and 1 part of BF-5 dehydrating agent, stir for 30 minutes under nitrogen protection, stop stirring and let stand for 30 minutes to obtain component B for later use.

[0116] 3. Mix components A and B at a mass ratio of 1:1, apply the mixture to a clean, dry glass plate, cure at room temperature, and leave for 7 days. The test results are shown in Table 1.

[0117] Comparative Example 1

[0118] The basic formula is the same as in Example 1, except that: 2 parts of 1,4-butanediol and 1 part of trimethylolpropane in step (2) of “Preparation of Component A” in Example 1 are replaced with 3 parts of MOCA chain extender; and the anti-settling environmentally friendly plasticizer in step (5) is replaced with an equal amount of tributyl citrate.

[0119] Comparative Example 2

[0120] The process is basically the same as in Example 1, except that the anti-settling environmentally friendly plasticizer in step (5) of “Preparation of Component A” in Example 1 is replaced with an equal amount of tributyl citrate.

[0121] Comparative Example 3

[0122] The basic formula is the same as in Example 1, except that: 2 parts of 1,4-butanediol and 1 part of trimethylolpropane in step (2) of “Preparation of Component A” in Example 1 are replaced with 3 parts of MOCA chain extender; and 15 parts of anti-settling environmentally friendly plasticizer in step (5) are replaced with 13.95 parts of tributyl citrate and 1.05 parts of fumed silica (model AEROSIL R816, Degussa).

[0123] All post-gel testing methods were conducted in accordance with the national standard GB36246-2018. After the composition cured at room temperature for 7 days, the results are shown in Table 1:

[0124] Table 1

[0125]

[0126] Note: The operating time is the time from the start of mixing the rubber compound until it can no longer flow freely; the AB mixed viscosity is the product obtained after mixing components A and B under the conditions of 23±2℃, #3 rotor, and 60r / min.

[0127] As shown in Table 1, using conventional raw materials, the plasticizer was tributyl citrate, and the chain extender was MOCA chain extender, which currently has the best performance (Comparative Example 1). However, the resulting foamed material was not environmentally friendly. Next, the MOCA chain extender was replaced with 1,4-butanediol and trimethylolpropane (Comparative Example 2). The resulting foamed material solved the environmental problem, but its mechanical properties were negatively affected. Further optimization of the plasticizer, using both tributyl citrate and fumed silica (used to adjust viscosity and reinforce), still could not solve the problem of reduced mechanical properties after replacing the MOCA chain extender with the A and B components in the gel. This invention continues to optimize the formulation by preparing an anti-settling environmentally friendly plasticizer, thereby obtaining a foamed material that is both environmentally friendly and has better mechanical properties.

[0128] As can be seen from the table above, in Examples 1-4, the powder of component A did not precipitate during storage. The composition obtained by mixing components A and B, after being coated onto a glass plate and foamed at room temperature, exhibited excellent physicochemical properties after 7 days of storage. This is because the self-made anti-settling environmentally friendly plasticizer has a network cross-linked chemical structure, which not only effectively stabilizes the powder distribution in component A but also effectively enhances the gel strength of the system. The mixture of components A and B exhibits stable foaming, excellent shock absorption performance, is halogen-free, odorless, and meets overall national standards. In terms of environmental protection, it is halogen-free, exceeding national environmental standards. Comparative Examples 1, 2, and 3 did not use the self-made anti-settling environmentally friendly plasticizer. Although component A maintained low viscosity and was solvent-free, the powder easily precipitated during storage. Therefore, the composition of this invention can achieve the preparation of room-temperature curing environmentally friendly polyurethane foam sports field materials.

[0129] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A room temperature curing environmentally friendly polyurethane foam sports field material, characterized by: It includes component A and component B; Component A includes the following components by mass: 10-20 parts of anti-settling environmentally friendly plasticizer, 40-50 parts of modified bio-based polyol, 10-20 parts of difunctional polyether polyol, 2-4 parts of environmentally friendly chain extender, 1-3 parts of colorant, 1-3 parts of ultraviolet absorber, 1-3 parts of antioxidant, 10-20 parts of talc, 0.05-0.25 parts of water, 0.05-0.15 parts of catalyst, 0.1-0.5 parts of foam leveling agent, and 0.3-0.8 parts of thixotropic agent; Component B includes the following components by mass: 3-8 parts of high-functionality polyether polyol, 15-25 parts of difunctionality polyether polyol, 15-25 parts of modified bio-based polyol, 3-8 parts of environmentally friendly plasticizer, 40-50 parts of diphenylmethane diisocyanate or its modified substance, 1-3 parts of ultraviolet absorber, 1-3 parts of antioxidant, and 1-2 parts of dehydrating agent; The anti-settling environmentally friendly plasticizer is prepared by the following steps: ① After vacuum dehydrating the environmentally friendly plasticizer at 100-110°C, add the dehydrating agent and fumed silica under stirring at 50-70°C under the protection of inert gas, and stir for 30-120 minutes; ② Then, add the crosslinking agent at 35-45° C. under stirring, react under stirring for 1-3 hours under inert gas protection and sealing, raise the temperature to 60-80° C. and evacuate for 2-4 hours; after the reaction is completed, cool down to obtain an anti-settling environmentally friendly plasticizer; wherein the environmentally friendly plasticizer, dehydrating agent, fumed silica and crosslinking agent are mixed in a mass ratio of 90:1-3:6-8:0.5-1.

5.

2. The room temperature curing environmentally friendly polyurethane foam sports field material according to claim 1, characterized in that: The component A comprises the following components by mass: 15 parts of anti-settling environmentally friendly plasticizer, 45 parts of modified bio-based polyol, 15 parts of difunctional polyether polyol, 3 parts of environmentally friendly chain extender, 2 parts of colorant, 2 parts of ultraviolet absorber, 2 parts of antioxidant, 15 parts of talc, 0.1 parts of water, 0.1 parts of catalyst, 0.3 parts of foam leveling agent, and 0.5 parts of thixotropic agent; The component B includes the following components in parts by mass: 5 parts of high-functionality polyether polyol, 20 parts of difunctional polyether polyol, 20 parts of modified bio-based polyol, 5 parts of environmentally friendly plasticizer, 45 parts of diphenylmethane diisocyanate or its modified product, 2 parts of ultraviolet absorber, 2 parts of antioxidant, and 1 part of dehydrating agent.

3. The room temperature curing environmentally friendly polyurethane foam sports field material according to claim 1 or 2, characterized in that: The environmentally friendly plasticizer is at least one of epoxidized soybean oil, tributyl citrate, acetyl tributyl citrate, diacetyl epoxidized vegetable oil glyceride and trioctyl citrate; The modified bio-based polyol is a modified bio-based polyol having an average hydroxyl value of 100 to 200 KOH / G and a viscosity of 1000 to 2000 CPS at 25°C; The difunctional polyether polyol is polypropylene oxide ether diol; The environmentally friendly chain extender is at least one of 1,4-butanediol, glycerol, polyetheramine T403, trimethylolpropane and ethyleneimine; The catalyst is a catalyst obtained by compounding at least one of N,N-dimethylcyclohexylamine, 1,8-diazabicycloundec-7-ene, N,N,N'-trimethyl-N'-hydroxyethylethylenediamine and 1,5-diazabicyclo[4.3.0]non-5-ene with a bismuth catalyst; The high-functionality polyether polyol is a trifunctional polyether polyol; The diphenylmethane diisocyanate or its modified product is MDI-50 or carbodiimide-modified MDI.

4. The room temperature curing environmentally friendly polyurethane foam sports field material according to claim 3, characterized in that: The modified bio-based polyol is at least one of cashew nut shell oil phenolic resin polyol and cashew nut oil polyol, and has an average hydroxyl value of 100 to 175 KOH / G and a viscosity of 1000 to 2000 CPS at 25°C; The bifunctional polyether polyol is a polypropylene oxide ether diol with a molecular weight of 400 to 4000; The bismuth catalyst is at least one of bismuth isooctanoate, bismuth neodecanoate and bismuth cyclohexaneate; The high-functionality polyether polyol is a polyether polyol with a functionality of 3 and a molecular weight of 4000-6000.

5. The room temperature curing environmentally friendly polyurethane foam sports field material according to claim 1 or 2, characterized in that: The dehydrating agent is dehydrating agent BF-5; The colorant is red iron oxide; The ultraviolet absorber is UV531 ultraviolet absorber; The antioxidant is at least one of antioxidant 1010 and antioxidant 168; The water is deionized water, distilled water or purified water; The foam leveling agent is a silicone foam leveling agent; The thixotropic agent is a rheological additive with anti-sagging and anti-settling properties.

6. The room temperature curing environmentally friendly polyurethane foam sports field material according to claim 1 or 2, characterized in that: The environmentally friendly plasticizer described in step ① is at least one of epoxidized soybean oil, tributyl citrate, acetyl tributyl citrate, diacetyl epoxidized vegetable oil glyceride and trioctyl citrate; The dehydration time described in step ① is 2 to 4 hours; The inert gas described in step ① is nitrogen; The dehydrating agent described in step ① is dehydrating agent BF-5; The stirring reaction time in step ① is 30 to 90 minutes; The cross-linking agent described in step ② is dichlorodimethylsilane; The reaction conditions described in step ② are as follows: stir the reaction for 2 h under inert gas protection and sealing, raise the temperature to 70° C., and evacuate for 3 h.

7. The method for preparing the room temperature curing environmentally friendly polyurethane foam sports field material according to any one of claims 1 to 6, characterized in that The steps include: (1) Preparation of component A: A. Stir the modified bio-based polyol, difunctional polyether polyol and environmentally friendly chain extender at 60-80°C and mix well; then add colorant, UV absorber, antioxidant and talcum powder and stir well; B. Cooling the product obtained in step A to 45-55° C., adding water, a catalyst, a foaming agent and a thixotropic agent under stirring, and stirring for reaction; C. Add an anti-settling environmentally friendly plasticizer to the product obtained in step B, stir the reaction and let stand to obtain component A; (2) Preparation of component B: A. Mix high-functionality polyether polyol, difunctionality polyether polyol, modified bio-based polyol and environmentally friendly plasticizer evenly, and dehydrate under vacuum at 100-110°C for 2-4h; (2) The product obtained in step A is cooled to 65-75°C, diphenylmethane diisocyanate or a modified product thereof is added, and the mixture is reacted at 55-65°C for 50-70 minutes under the protection of an inert atmosphere; the mixture is then heated twice for reaction, each time by 8-12°C and the reaction time is 50-70 minutes; after the reaction is completed, the mixture is cooled to 55-65°C, an ultraviolet absorber, an antioxidant and a dehydrating agent are added, and the mixture is mixed evenly under the protection of an inert gas, and the mixture is allowed to stand to obtain component B.

8. Use of the room temperature curing environmentally friendly polyurethane foam sports field material according to any one of claims 1 to 6 in the preparation of environmentally friendly polyurethane foam sports fields.

9. The use according to claim 8, characterized in that The method comprises the following steps: evenly mixing component A and component B in a mass ratio of 1:1, and then carrying out construction.

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