An antibacterial running track material and its preparation method

Abstract

This invention relates to the field of rubber materials and discloses an antibacterial running track material, comprising the following raw materials in parts by weight: 30-40 parts acrylic resin, 20-40 parts EPDM rubber substrate, 1-5 parts antibacterial composition, 5-15 parts weathering agent, 3-8 parts pigment, 1-8 parts dispersant, 3-10 parts crosslinking agent, and 10-30 parts reinforcing agent; the reinforcing agent comprises the following raw materials in parts by weight: 5-20 parts polyester polyol, 4-9 parts diatomaceous earth, 3-10 parts glass fiber, and 2-8 parts chlorinated paraffin; the antibacterial composition consists of 3 parts crosslinkable guanidine antibacterial agent and 5 parts nano silver; the weathering agent comprises the following components in parts by weight: 7-9 parts light stabilizer and 1-3 parts antioxidant. This antibacterial running track material, through the combination of crosslinkable guanidine antibacterial agent and nano silver, can achieve a super bactericidal effect and can effectively remove odors and harmful substances, achieving sterility requirements. Furthermore, the addition of a specially formulated weathering agent enhances the practical strength of the running track material.

Description

Technical Field

[0001] This invention relates to the field of rubber materials, specifically to an antibacterial running track material and its preparation method. Background Technology

[0002] Plastic running tracks, also known as all-weather athletic tracks, are composed of polyurethane prepolymer, mixed polyethers, waste tire rubber, EPDM rubber granules or PU particles, pigments, additives, and fillers. Plastic running tracks possess characteristics such as good flatness, high compressive strength, appropriate hardness and elasticity, and stable physical properties, which are beneficial to athletes' speed and technique, effectively improving athletic performance and reducing the rate of falls and injuries. While plastic running tracks are composed of materials such as polyurethane rubber and have a certain degree of elasticity and color, prolonged use and weathering in natural environments can easily cause wear and tear. Therefore, the strength requirements of plastic running track materials are crucial, and the antibacterial and bacteriostatic capabilities of the materials themselves need to be guaranteed under natural conditions. Prolonged use can easily lead to bacterial growth, affecting not only the appearance of the plastic running track but also its service life. To address this, we propose an antibacterial running track material and its preparation method. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides an antibacterial running track material and its preparation method, thus solving the aforementioned problems.

[0005] (II) Technical Solution

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: an antibacterial running track material, comprising the following raw materials in parts by weight: 30-40 parts acrylic resin, 20-40 parts EPDM rubber substrate, 1-5 parts antibacterial composition, 5-15 parts weathering agent, 3-8 parts pigment, 1-8 parts dispersant, 3-10 parts crosslinking agent and 10-30 parts reinforcing agent;

[0007] The reinforcing agent comprises the following raw materials in parts by weight: 5-20 parts polyester polyol, 4-9 parts diatomaceous earth, 3-10 parts glass fiber, and 2-8 parts chlorinated paraffin;

[0008] The antibacterial composition consists of 3 parts crosslinkable guanidine antibacterial agent and 5 parts nano silver;

[0009] The weathering agent comprises the following components by weight: 7-9 parts of light stabilizer and 1-3 parts of antioxidant.

[0010] Preferably, the crosslinkable guanidine antibacterial agent is crosslinkable guanidine antibacterial agent I or crosslinkable guanidine antibacterial agent II;

[0011] Crosslinkable guanidine antibacterial agent I is composed of 1 part terminally functionalized organosilicon polymer, 2 parts guanidine oligomer and 3 parts vinyl-containing reactive / crosslinking functional compound VL;

[0012] Crosslinkable guanidine antibacterial agent II is composed of 1 part of terminal functionalized organosilicon polymer, 2 parts of guanidine oligomer and 3 parts of reactive / crosslinking functional compound AO containing alkoxysilane;

[0013] The end-functionalized organosilicon polymer is Silmer OH Di-50, and the guanidine oligomer is polyhexamethylene guanidine.

[0014] Preferably, the vinyl-containing reactive / crosslinking functional compound VL is selected from one or a mixture of several of glycidyl methacrylate, allyl glycidyl ether, allylamine, maleic anhydride, acrylic acid or acryloyl chloride, preferably glycidyl methacrylate and allyl glycidyl ether;

[0015] The alkoxysilane-containing reactive / crosslinking functional compound AO is selected from one or a mixture of several of the following: 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane, 3-glycidyl etheroxypropyltrimethoxysilane, 3-glycidyl etheroxypropyltriethoxysilane, 3-glycidyl etheroxypropylmethyldiethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-isocyanate-propyltrimethoxysilane, or 3-isocyanate-propyltriethoxysilane.

[0016] Preferably, the crosslinkable guanidine antibacterial agent I is used to add to the high-temperature antibacterial running track material;

[0017] The crosslinkable guanidine antimicrobial agent II is used to add to room temperature antimicrobial running track materials.

[0018] Preferably, the light stabilizer in the weathering agent is one or more of the following: salicylates, benzophenones, benzotriazoles, triazines, substituted acrylonitriles, oxalamides, organonickel compounds, and hindered amines.

[0019] The antioxidant in the weathering agent is one or more of antioxidant 1010, antioxidant 1076 and antioxidant 626.

[0020] Preferably, in addition to the light stabilizer and antioxidant, the weathering agent further includes 3 parts mercaptobenzimidazole and 2 parts silica, and the preparation steps of the weathering agent are as follows:

[0021] a. Add a certain amount of antioxidant and mercaptobenzimidazole to a mixing tank and mix evenly for 5-10 minutes at a speed of 1000-1500 r / min. After uniform mixing, add light stabilizer and continue mixing for 3-5 minutes to obtain a mixture.

[0022] b. After the mixture is completely mixed, add silica and continue mixing at 1200-1600 r / min for 10-15 min to obtain the weathering agent.

[0023] Preferably, the dispersant is one or more of alcohol hydroxyl-modified silicone oil, mercapto-modified silicone oil, and hydrophobic-modified polycarboxylic acid dispersant.

[0024] Preferably, the crosslinking agent is a mixture comprising dicumyl peroxide and trimethylolpropane trimethacrylate in a mass ratio of 2:1.

[0025] Preferably, the preparation method of the antibacterial running track material includes the following steps:

[0026] S1. The EPDM rubber substrate is crushed into rubber granules using a pulverizer, and then screened by a screening machine to obtain EPDM rubber granules for later use.

[0027] S2. Then, add polyester polyol, diatomaceous earth, glass fiber, and chlorinated paraffin into the reactor and stir and disperse them at a stirring speed of 1000-1200 r / min for 30-60 min to obtain the reinforcing agent. Then, mix the obtained reinforcing agent and weathering agent evenly, add the antibacterial composition and half of the crosslinking agent and mix evenly to obtain mixture A.

[0028] S3. Mix the acrylic resin, the EPDM rubber particles obtained in step S1, and the dispersant evenly, then add the remaining half of the crosslinking agent and mix evenly to obtain mixture B; finally, add mixture A and the pigment to mixture B and mix evenly to obtain the mixture material.

[0029] S4. Place the mixture obtained in step S3 into a grinder for grinding until it reaches 0.1mm-0.3mm. After grinding, dry it using a vacuum dryer at a temperature of 150-220℃ for 50-100 minutes. After drying, the antibacterial running track material can be obtained.

[0030] Preferably, the S4 drying process is a segmented drying process, with the first segment at 150-180℃, the second segment at 160-190℃, the third segment at 160-200℃, the fourth segment at 160-210℃, and the fifth segment at 170-220℃.

[0031] (III) Beneficial Effects

[0032] Compared with the prior art, the present invention provides an antibacterial running track material with the following beneficial effects:

[0033] 1. This antibacterial running track material uses crosslinkable guanidine antibacterial agent I and crosslinkable guanidine antibacterial agent II, which will be used in high-temperature antibacterial running track rubber and room-temperature antibacterial running track rubber, respectively. During the vulcanization or curing of the running track rubber, the guanidine antibacterial agent participates in the chemical crosslinking system to achieve the goal of safe, non-leaching, and long-lasting antibacterial and antifungal properties. In addition to being safe, long-lasting, and broad-spectrum, the resulting antibacterial and antifungal running track rubber material has a small amount of crosslinkable guanidine antibacterial agent added, which has good dispersibility in the rubber and does not affect the original performance of the running track rubber material. At the same time, when combined with nano-silver, it can achieve a super bactericidal effect and effectively remove odors and harmful substances to meet the requirements of sterility.

[0034] 2. The antibacterial running track material, by adding a weather-resistant agent containing mercaptobenzimidazole, can absorb ultraviolet rays and has long-lasting antioxidant and anti-yellowing properties.

[0035] 3. The dispersant used in this antibacterial running track material is alcohol hydroxyl-modified silicone oil, mercapto-modified silicone oil, or hydrophobic modified polycarboxylic acid dispersant. This not only ensures good dispersibility of the material but also serves as an environmentally friendly plasticizer for the matrix composite material, improving the plasticity of the composite material. It is green, healthy, environmentally friendly, and suitable for use in floor running track products. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the preparation method of the antibacterial running track material of the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1 An antibacterial running track material comprises the following raw materials in parts by weight: 30-40 parts acrylic resin, 20-40 parts EPDM rubber substrate, 1-5 parts antibacterial composition, 5-15 parts weathering agent, 3-8 parts pigment, 1-8 parts dispersant, 3-10 parts crosslinking agent and 10-30 parts reinforcing agent;

[0039] The reinforcing agent comprises the following raw materials in parts by weight: 5-20 parts polyester polyol, 4-9 parts diatomaceous earth, 3-10 parts glass fiber, and 2-8 parts chlorinated paraffin;

[0040] The antibacterial composition consists of 3 parts crosslinkable guanidine antibacterial agent and 5 parts nano silver;

[0041] The weathering agent comprises the following components by weight: 7-9 parts light stabilizer and 1-3 parts antioxidant.

[0042] Crosslinkable guanidine antibacterial agents are either crosslinkable guanidine antibacterial agent I or crosslinkable guanidine antibacterial agent II;

[0043] Crosslinkable guanidine antibacterial agent I is composed of 1 part terminally functionalized organosilicon polymer, 2 parts guanidine oligomer and 3 parts vinyl-containing reactive / crosslinking functional compound VL;

[0044] Crosslinkable guanidine antibacterial agent II is composed of 1 part of terminal functionalized organosilicon polymer, 2 parts of guanidine oligomer and 3 parts of reactive / crosslinking functional compound AO containing alkoxysilane;

[0045] The end-functionalized organosilicon polymer is Silmer OH Di-50, and the guanidine oligomer is polyhexamethylene guanidine.

[0046] The vinyl-containing reactive / crosslinking functional compound VL is selected from one or a mixture of several of glycidyl methacrylate, allyl glycidyl ether, allylamine, maleic anhydride, acrylic acid or acryloyl chloride, preferably glycidyl methacrylate and allyl glycidyl ether;

[0047] The reactive / crosslinking functional compound AO containing alkoxysilane is selected from one or a mixture of several of the following: 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane, 3-glycidyl etheroxypropyltrimethoxysilane, 3-glycidyl etheroxypropyltriethoxysilane, 3-glycidyl etheroxypropylmethyldiethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-isocyanate-propyltrimethoxysilane, or 3-isocyanate-propyltriethoxysilane.

[0048] Crosslinkable guanidine antibacterial agent I is used as an additive in high-temperature antibacterial running track materials;

[0049] Crosslinkable guanidine antimicrobial agent II is used to add to room temperature antimicrobial running track materials.

[0050] Because crosslinkable guanidine antibacterial agents participate in the crosslinking reaction during rubber vulcanization and thus bond to the rubber system, they have the characteristics of non-leakage, non-loss, and long-lasting antibacterial and antifungal effects. Guanidine oligomers have broad-spectrum and highly efficient antibacterial properties and do not destroy the structure of the antibacterial agent when crosslinking into the rubber system, thus giving the rubber excellent antifungal and antibacterial effects. Crosslinkable guanidine antibacterial agents contain some organosilicon segments, so they can be uniformly dispersed in the rubber. In addition, the amount of antibacterial agent added is small, so it does not affect the original properties of the rubber.

[0051] This antibacterial running track material utilizes broad-spectrum, highly efficient antibacterial and antifungal properties. Guanidine oligomers and end-functionalized polymers are chemically reacted with vinyl-containing reactive / crosslinking functional compounds (VL) and alkoxysilane-containing reactive / crosslinking functional compounds (AO), respectively, to obtain crosslinkable guanidine antibacterial agent I and crosslinkable guanidine antibacterial agent II. These will be used in high-temperature antibacterial running track rubber and room-temperature antibacterial running track rubber, respectively. During the vulcanization or curing of the running track rubber, the guanidine antibacterial agent participates in the chemical crosslinking system, achieving a safe, non-leaching, and long-lasting antibacterial and antifungal effect. In addition to being safe, long-lasting, and broad-spectrum, the resulting antibacterial and antifungal running track rubber material requires a small amount of crosslinkable guanidine antibacterial agent, exhibiting good dispersibility in the rubber without affecting the original properties of the running track rubber material. Furthermore, when combined with nano-silver, it achieves a powerful bactericidal effect and effectively removes odors and harmful substances, meeting sterility requirements.

[0052] The light stabilizer in the weathering agent is one or more of the following: salicylates, benzophenones, benzotriazoles, triazines, substituted acrylonitriles, oxalamides, organonickel compounds, and hindered amines;

[0053] The antioxidant in the weathering agent is one or more of antioxidant 1010, antioxidant 1076 and antioxidant 626.

[0054] In addition to light stabilizers and antioxidants, the weathering agent also includes 3 parts mercaptobenzimidazole and 2 parts silica. The preparation steps of the weathering agent are as follows:

[0055] a. Add a certain amount of antioxidant and mercaptobenzimidazole to a mixing tank and mix evenly for 5-10 minutes at a speed of 1000-1500 r / min. After uniform mixing, add light stabilizer and continue mixing for 3-5 minutes to obtain a mixture.

[0056] b. After the mixture is completely mixed, add silica and continue mixing at 1200-1600 r / min for 10-15 min to obtain the weathering agent.

[0057] The antibacterial running track material, by adding weather-resistant agents, can absorb ultraviolet rays and has long-lasting antioxidant and anti-yellowing properties.

[0058] The dispersant is one or more of the following: hydroxyl-modified silicone oil, mercapto-modified silicone oil, and hydrophobic-modified polycarboxylate dispersant. Hydroxyl-modified silicone oil dispersant can be purchased from Shanghai Koraman Reagent Co., Ltd., mercapto-modified silicone oil dispersant from Shanghai Pengshuo Biotechnology Co., Ltd., and hydrophobic-modified polycarboxylate dispersant from Shanghai Huiyan New Materials Co., Ltd. This dispersant not only ensures good dispersibility of the material but also acts as an environmentally friendly plasticizer in the matrix composite material, improving the plasticity of the composite material. It is green, healthy, and environmentally friendly, making it suitable for use in flooring and running track products.

[0059] The crosslinking agent is a mixture of dicumyl peroxide and trimethylolpropane trimethacrylate in a mass ratio of 2:1.

[0060] The preparation method of the antibacterial running track material includes the following steps:

[0061] S1. The EPDM rubber substrate is crushed into rubber granules using a pulverizer, and then screened by a screening machine to obtain EPDM rubber granules for later use.

[0062] S2. Then, add polyester polyol, diatomaceous earth, glass fiber, and chlorinated paraffin into the reactor and stir and disperse them at a stirring speed of 1000-1200 r / min for 30-60 min to obtain the reinforcing agent. Then, mix the obtained reinforcing agent and weathering agent evenly, add the antibacterial composition and half of the crosslinking agent and mix evenly to obtain mixture A.

[0063] S3. Mix the acrylic resin, the EPDM rubber particles obtained in step S1, and the dispersant evenly, then add the remaining half of the crosslinking agent and mix evenly to obtain mixture B; finally, add mixture A and the pigment to mixture B and mix evenly to obtain the mixture material.

[0064] S4. Place the mixture obtained in step S3 into a grinder for grinding until it reaches 0.1mm-0.3mm. After grinding, dry it using a vacuum dryer at a temperature of 150-220℃ for 50-100 minutes. After drying, the antibacterial running track material can be obtained.

[0065] The S4 drying process is a segmented drying process: the first segment is 150-180℃, the second segment is 160-190℃, the third segment is 160-200℃, the fourth segment is 160-210℃, and the fifth segment is 170-220℃.

[0066] Example 1

[0067] An antibacterial running track material comprises the following raw materials in parts by weight: 30 parts acrylic resin, 20 parts EPDM rubber substrate, 1 part antibacterial composition, 5 parts weathering agent, 3 parts pigment, 1 part dispersant, 3 parts crosslinking agent and 10 parts reinforcing agent;

[0068] The reinforcing agent comprises the following raw materials in parts by weight: 5 parts polyester polyol, 4 parts diatomaceous earth, 3 parts glass fiber, and 2 parts chlorinated paraffin;

[0069] The antibacterial composition consists of 3 parts crosslinkable guanidine antibacterial agent and 5 parts nano silver;

[0070] The weather-resistant agent comprises the following components by weight: 7 parts light stabilizer and 1 part antioxidant;

[0071] In addition to light stabilizers and antioxidants, the weathering agent also includes 3 parts mercaptobenzimidazole and 2 parts silica. The preparation steps of the weathering agent are as follows:

[0072] a. Add a certain amount of antioxidant and mercaptobenzimidazole to a mixing tank and mix evenly for 10 minutes at a speed of 1500 r / min. After uniform mixing, add light stabilizer and continue mixing for 5 minutes to obtain a mixture.

[0073] b. After the mixture is completely mixed, add silica and continue mixing at 1600 r / min for 15 min to obtain the weathering agent.

[0074] Crosslinkable guanidine antibacterial agents are either crosslinkable guanidine antibacterial agent I or crosslinkable guanidine antibacterial agent II;

[0075] Crosslinkable guanidine antibacterial agent I is composed of 1 part terminally functionalized organosilicon polymer, 2 parts guanidine oligomer and 3 parts vinyl-containing reactive / crosslinking functional compound VL;

[0076] Crosslinkable guanidine antibacterial agent II is composed of 1 part of terminal functionalized organosilicon polymer, 2 parts of guanidine oligomer and 3 parts of reactive / crosslinking functional compound AO containing alkoxysilane;

[0077] The end-functionalized organosilicon polymer is Silmer OH Di-50, and the guanidine oligomer is polyhexamethylene guanidine.

[0078] VL, a vinyl-containing reactive / crosslinking functional compound, is glycidyl methacrylate.

[0079] The reactive / crosslinking functional compound AO containing alkoxysilane is selected from N-(2-aminoethyl)-3-aminopropyltriethoxysilane.

[0080] Crosslinkable guanidine antibacterial agent I is used as an additive in high-temperature antibacterial running track materials;

[0081] Crosslinkable guanidine antimicrobial agent II is used for addition to room temperature antimicrobial running track materials.

[0082] The light stabilizer in the weathering agent is a salicylic acid ester, and the antioxidant is antioxidant 1010;

[0083] The dispersant is hydroxyl-modified silicone oil;

[0084] The crosslinking agent is a mixture of dicumyl peroxide and trimethylolpropane trimethacrylate in a mass ratio of 2:1.

[0085] Its preparation method includes the following steps:

[0086] S1. The EPDM rubber substrate is crushed into rubber granules using a pulverizer, and then screened by a screening machine to obtain EPDM rubber granules for later use.

[0087] S2. Then, polyester polyol, diatomaceous earth, glass fiber, and chlorinated paraffin are added to the reaction vessel and stirred and dispersed at a stirring speed of 1200 r / min for 50 min to obtain a reinforcing agent. The obtained reinforcing agent is then mixed evenly with the weathering agent, and then the antibacterial composition and half of the crosslinking agent are added and mixed evenly to obtain mixture A.

[0088] S3. Mix the acrylic resin, the EPDM rubber particles obtained in step S1, and the dispersant evenly, then add the remaining half of the crosslinking agent and mix evenly to obtain mixture B; finally, add mixture A and the pigment to mixture B and mix evenly to obtain the mixture material.

[0089] S4. Place the mixture obtained in step S3 into a grinding mill for grinding until it reaches 0.2 mm. After grinding, use a vacuum dryer to dry it. The material is dried in stages: stage 1 at 160°C, stage 2 at 180°C, stage 3 at 190°C, stage 4 at 200°C, and stage 5 at 200°C. The total drying time is 80 minutes. After drying, the antibacterial running track material can be obtained.

[0090] Example 2

[0091] An antibacterial running track material comprises the following raw materials in parts by weight: 35 parts acrylic resin, 30 parts EPDM rubber substrate, 2.5 parts antibacterial composition, 10 parts weather resistant agent, 6 parts pigment, 5 parts dispersant, 6 parts crosslinking agent and 20 parts reinforcing agent;

[0092] The reinforcing agent comprises the following raw materials in parts by weight: 15 parts polyester polyol, 7 parts diatomaceous earth, 6 parts glass fiber, and 5 parts chlorinated paraffin.

[0093] The antibacterial composition consists of 3 parts crosslinkable guanidine antibacterial agent and 5 parts nano silver;

[0094] The weather-resistant agent comprises the following components by weight: 8 parts light stabilizer and 2 parts antioxidant;

[0095] In addition to light stabilizers and antioxidants, the weathering agent also includes 3 parts mercaptobenzimidazole and 2 parts silica. The preparation steps of the weathering agent are as follows:

[0096] a. Add a certain amount of antioxidant and mercaptobenzimidazole to a mixing tank and mix evenly for 10 minutes at a speed of 1500 r / min. After uniform mixing, add light stabilizer and continue mixing for 5 minutes to obtain a mixture.

[0097] b. After the mixture is completely mixed, add silica and continue mixing at 1600 r / min for 15 min to obtain the weathering agent.

[0098] Crosslinkable guanidine antibacterial agents are either crosslinkable guanidine antibacterial agent I or crosslinkable guanidine antibacterial agent II;

[0099] Crosslinkable guanidine antibacterial agent I is composed of 1 part terminally functionalized organosilicon polymer, 2 parts guanidine oligomer and 3 parts vinyl-containing reactive / crosslinking functional compound VL;

[0100] Crosslinkable guanidine antibacterial agent II is composed of 1 part of terminal functionalized organosilicon polymer, 2 parts of guanidine oligomer and 3 parts of reactive / crosslinking functional compound AO containing alkoxysilane;

[0101] The end-functionalized organosilicon polymer is Silmer OH Di-50, and the guanidine oligomer is polyhexamethylene guanidine.

[0102] VL, a vinyl-containing reactive / crosslinking functional compound, is glycidyl methacrylate.

[0103] The reactive / crosslinking functional compound AO containing alkoxysilane is selected from N-(2-aminoethyl)-3-aminopropyltriethoxysilane.

[0104] Crosslinkable guanidine antibacterial agent I is used as an additive in high-temperature antibacterial running track materials;

[0105] Crosslinkable guanidine antimicrobial agent II is used for addition to room temperature antimicrobial running track materials.

[0106] The light stabilizer in the weathering agent is a salicylic acid ester, and the antioxidant is antioxidant 1010;

[0107] The dispersant is hydroxyl-modified silicone oil;

[0108] The crosslinking agent is a mixture of dicumyl peroxide and trimethylolpropane trimethacrylate in a mass ratio of 2:1.

[0109] Its preparation method includes the following steps:

[0110] S1. The EPDM rubber substrate is crushed into rubber granules using a pulverizer, and then screened by a screening machine to obtain EPDM rubber granules for later use.

[0111] S2. Then, polyester polyol, diatomaceous earth, glass fiber, and chlorinated paraffin are added to the reaction vessel and stirred and dispersed at a stirring speed of 1200 r / min for 50 min to obtain a reinforcing agent. The obtained reinforcing agent is then mixed evenly with the weathering agent, and then the antibacterial composition and half of the crosslinking agent are added and mixed evenly to obtain mixture A.

[0112] S3. Mix the acrylic resin, the EPDM rubber particles obtained in step S1, and the dispersant evenly, then add the remaining half of the crosslinking agent and mix evenly to obtain mixture B; finally, add mixture A and the pigment to mixture B and mix evenly to obtain the mixture material.

[0113] S4. Place the mixture obtained in step S3 into a grinding mill for grinding until it reaches 0.2 mm. After grinding, use a vacuum dryer to dry it. The material is dried in stages: stage 1 at 165°C, stage 2 at 180°C, stage 3 at 190°C, stage 4 at 190°C, and stage 5 at 200°C. The total drying time is 80 minutes. After drying, the antibacterial running track material can be obtained.

[0114] Example 3

[0115] An antibacterial running track material comprises the following raw materials in parts by weight: 40 parts acrylic resin, 40 parts EPDM rubber substrate, 5 parts antibacterial composition, 15 parts weathering agent, 8 parts pigment, 8 parts dispersant, 10 parts crosslinking agent, and 30 parts reinforcing agent;

[0116] The reinforcing agent comprises the following raw materials in parts by weight: 20 parts polyester polyol, 9 parts diatomaceous earth, 10 parts glass fiber, and 8 parts chlorinated paraffin;

[0117] The antibacterial composition consists of 3 parts crosslinkable guanidine antibacterial agent and 5 parts nano silver;

[0118] In addition to light stabilizers and antioxidants, the weathering agent also includes 3 parts mercaptobenzimidazole and 2 parts silica. The preparation steps of the weathering agent are as follows:

[0119] a. Add a certain amount of antioxidant and mercaptobenzimidazole to a mixing tank and mix evenly for 10 minutes at a speed of 1500 r / min. After uniform mixing, add light stabilizer and continue mixing for 5 minutes to obtain a mixture.

[0120] b. After the mixture is completely mixed, add silica and continue mixing at 1600 r / min for 15 min to obtain the weathering agent.

[0121] The weather-resistant agent comprises the following components by weight: 9 parts light stabilizer and 3 parts antioxidant; the crosslinkable guanidine antibacterial agent is either crosslinkable guanidine antibacterial agent I or crosslinkable guanidine antibacterial agent II;

[0122] Crosslinkable guanidine antibacterial agent I is composed of 1 part terminally functionalized organosilicon polymer, 2 parts guanidine oligomer and 3 parts vinyl-containing reactive / crosslinking functional compound VL;

[0123] Crosslinkable guanidine antibacterial agent II is composed of 1 part of terminal functionalized organosilicon polymer, 2 parts of guanidine oligomer and 3 parts of reactive / crosslinking functional compound AO containing alkoxysilane;

[0124] The end-functionalized organosilicon polymer is Silmer OH Di-50, and the guanidine oligomer is polyhexamethylene guanidine.

[0125] VL, a vinyl-containing reactive / crosslinking functional compound, is glycidyl methacrylate.

[0126] The reactive / crosslinking functional compound AO containing alkoxysilane is selected from N-(2-aminoethyl)-3-aminopropyltriethoxysilane.

[0127] Crosslinkable guanidine antibacterial agent I is used as an additive in high-temperature antibacterial running track materials;

[0128] Crosslinkable guanidine antimicrobial agent II is used for addition to room temperature antimicrobial running track materials.

[0129] The light stabilizer in the weathering agent is a salicylic acid ester, and the antioxidant is antioxidant 1010;

[0130] The dispersant is hydroxyl-modified silicone oil;

[0131] The crosslinking agent is a mixture of dicumyl peroxide and trimethylolpropane trimethacrylate in a mass ratio of 2:1.

[0132] Its preparation method includes the following steps:

[0133] S1. The EPDM rubber substrate is crushed into rubber granules using a pulverizer, and then screened by a screening machine to obtain EPDM rubber granules for later use.

[0134] S2. Then, polyester polyol, diatomaceous earth, glass fiber, and chlorinated paraffin are added to the reaction vessel and stirred and dispersed at a stirring speed of 1200 r / min for 50 min to obtain a reinforcing agent. The obtained reinforcing agent is then mixed evenly with the weathering agent, and then the antibacterial composition and half of the crosslinking agent are added and mixed evenly to obtain mixture A.

[0135] S3. Mix the acrylic resin, the EPDM rubber particles obtained in step S1, and the dispersant evenly, then add the remaining half of the crosslinking agent and mix evenly to obtain mixture B; finally, add mixture A and the pigment to mixture B and mix evenly to obtain the mixture material.

[0136] S4. Place the mixture obtained in step S3 into a grinding mill for grinding until it reaches 0.2 mm. After grinding, use a vacuum dryer to dry it. The material is dried in stages: stage 1 is 180°C, stage 2 is 190°C, stage 3 is 200°C, stage 4 is 210°C, and stage 5 is 220°C. The total drying time is 80 minutes. After drying, the antibacterial running track material can be obtained.

[0137] Comparative Example 1

[0138] The mercaptobenzimidazole component in the raw materials used to form the weather-resistant agent in Example 2 was removed, while the rest remained the same.

[0139] Comparative Example 2

[0140] The cross-linkable guanidine antibacterial agent in the antibacterial composition of Example 2 was removed, while the rest remained the same.

[0141] Experimental Test 1: The antibacterial running track materials prepared in Examples 1 to 3 and Comparative Example 1 were tested. They were exposed to ultraviolet light outdoors for 24 hours, followed by 10 days of continued outdoor exposure. The appearance changes and tensile strength of the antibacterial running track materials after ultraviolet light treatment were tested according to GB / T14833-2020. The specific test results are shown in the table below:

[0142]

[0143] Based on the above results, it can be concluded that the antibacterial running track material, by adding a weather-resistant agent containing mercaptobenzimidazole, can absorb ultraviolet rays and possess long-lasting antioxidant and anti-yellowing properties.

[0144] Experimental Test 2: The antibacterial running track materials prepared in Examples 1 to 3 and Comparative Example 2 were tested. Antibacterial performance was tested according to standard QB / T2591 Antibacterial Plastics - Test Method for Antibacterial Performance and Antibacterial Effect, using Staphylococcus aureus and Escherichia coli as test bacteria. Anti-mold performance was tested according to Appendix B of standard QB / T2591 Antibacterial Plastics Anti-mold Performance Test Method, using Aspergillus niger and Chaetomium globosum as test bacteria. Specific test results are shown in the table below:

[0145]

[0146] Based on the above results, the antibacterial running track material utilizes guanidine oligomers and end-functionalized polymers with broad-spectrum and high-efficiency antibacterial and antifungal functions to chemically react with vinyl-containing reactive / crosslinking functional compounds VL and alkoxysilane-containing reactive / crosslinking functional compounds AO, respectively, to obtain crosslinkable guanidine antibacterial agent I and crosslinkable guanidine antibacterial agent II. These will be used in high-temperature antibacterial running track rubber and room-temperature antibacterial running track rubber, respectively. During the vulcanization or curing of the running track rubber, the guanidine antibacterial agent participates in the chemical crosslinking system, achieving the goal of safe, non-dissolving, and long-lasting antibacterial and antifungal properties. In addition to being safe, long-lasting, and broad-spectrum, the obtained antibacterial and antifungal running track rubber material has a small amount of crosslinkable guanidine antibacterial agent added, good dispersibility in the rubber, and does not affect the original performance of the running track rubber material. At the same time, when combined with nano-silver, it can achieve super bactericidal effect and effectively remove odors and harmful substances, achieving sterility requirements.

[0147] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A material for antibacterial running tracks, characterized in that, It includes the following raw materials in parts by weight: 30-40 parts acrylic resin, 20-40 parts EPDM rubber base material, 1-5 parts antibacterial composition, 5-15 parts weathering agent, 3-8 parts pigment, 1-8 parts dispersant, 3-10 parts crosslinking agent and 10-30 parts reinforcing agent; The reinforcing agent comprises the following raw materials in parts by weight: 5-20 parts polyester polyol, 4-9 parts diatomaceous earth, 3-10 parts glass fiber, and 2-8 parts chlorinated paraffin; The antibacterial composition consists of 3 parts crosslinkable guanidine antibacterial agent and 5 parts nano silver; The weathering agent comprises the following components in parts by weight: 7-9 parts of light stabilizer and 1-3 parts of antioxidant. In addition to the light stabilizer and antioxidant, the weathering agent also includes 3 parts of mercaptobenzimidazole and 2 parts of silica. The crosslinkable guanidine antibacterial agent is either crosslinkable guanidine antibacterial agent I or crosslinkable guanidine antibacterial agent II; Crosslinkable guanidine antibacterial agent I is composed of 1 part terminally functionalized organosilicon polymer, 2 parts guanidine oligomer and 3 parts vinyl-containing reactive / crosslinking functional compound VL; Crosslinkable guanidine antibacterial agent II is composed of 1 part of terminal functionalized organosilicon polymer, 2 parts of guanidine oligomer and 3 parts of reactive / crosslinking functional compound AO containing alkoxysilane; The end-functionalized organosilicon polymer is Silmer OH Di-50, and the guanidine oligomer is polyhexamethylene guanidine.

2. The antibacterial running track material according to claim 1, characterized in that, The vinyl-containing reactive / crosslinking functional compound VL is selected from one or a mixture of several of glycidyl methacrylate, allyl glycidyl ether, allylamine, maleic anhydride, acrylic acid, or acryloyl chloride. The alkoxysilane-containing reactive / crosslinking functional compound AO is selected from one or a mixture of several of the following: 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane, 3-glycidyl etheroxypropyltrimethoxysilane, 3-glycidyl etheroxypropyltriethoxysilane, 3-glycidyl etheroxypropylmethyldiethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-isocyanate-propyltrimethoxysilane, or 3-isocyanate-propyltriethoxysilane.

3. The antibacterial running track material according to claim 1, characterized in that, The crosslinkable guanidine antibacterial agent I is used to be added to high-temperature antibacterial running track materials; The crosslinkable guanidine antimicrobial agent II is used to add to room temperature antimicrobial running track materials.

4. The antibacterial running track material according to claim 1, characterized in that, The light stabilizer in the weathering agent is one or more of the following: salicylates, benzophenones, benzotriazoles, triazines, substituted acrylonitriles, oxalamides, organonickel compounds, and hindered amines; The antioxidant in the weathering agent is one or more of antioxidant 1010, antioxidant 1076 and antioxidant 626.

5. The antibacterial running track material according to claim 4, characterized in that, The preparation steps of the weather-resistant agent are as follows: a. Add a certain amount of antioxidant and mercaptobenzimidazole to a mixing tank and mix evenly for 5-10 minutes at a speed of 1000-1500 r / min. After uniform mixing, add light stabilizer and continue mixing for 3-5 minutes to obtain a mixture. b. After the mixture is completely mixed, add silica and continue mixing at 1200-1600 r / min for 10-15 min to obtain the weathering agent.

6. The antibacterial running track material according to claim 1, characterized in that, The dispersant is one or more of the following: alcohol hydroxyl-modified silicone oil, mercapto-modified silicone oil, and hydrophobic modified polycarboxylic acid dispersant.

7. The antibacterial running track material according to claim 1, characterized in that, The crosslinking agent is a mixture comprising dicumyl peroxide and trimethylolpropane trimethacrylate in a mass ratio of 2:

1.

8. A method for preparing an antibacterial running track material according to any one of claims 1-7, characterized in that, Includes the following steps: S1. The EPDM rubber substrate is crushed into rubber granules using a pulverizer, and then screened by a screening machine to obtain EPDM rubber granules for later use. S2. Then, add polyester polyol, diatomaceous earth, glass fiber, and chlorinated paraffin into the reactor and stir and disperse them at a stirring speed of 1000-1200 r / min for 30-60 min to obtain the reinforcing agent. Then, mix the obtained reinforcing agent and weathering agent evenly, add the antibacterial composition and half of the crosslinking agent and mix evenly to obtain mixture A. S3. Mix the acrylic resin, the EPDM rubber particles obtained in step S1, and the dispersant evenly, then add the remaining half of the crosslinking agent and mix evenly to obtain mixture B; finally, add mixture A and the pigment to mixture B and mix evenly to obtain the mixture material. S4. Place the mixture obtained in step S3 into a grinder for grinding until it reaches 0.1mm-0.3mm. After grinding, dry it using a vacuum dryer at a temperature of 150-220℃ for 50-100 minutes. After drying, the antibacterial running track material can be obtained.

9. The method for preparing an antibacterial running track material according to claim 8, characterized in that, The S4 drying process is a segmented drying process, with the first segment at 150-180℃, the second segment at 160-190℃, the third segment at 160-200℃, the fourth segment at 160-210℃, and the fifth segment at 170-220℃.

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