Antiskid dirt-resistant thermoplastic elastomer material and preparation method thereof

Abstract

The invention discloses an anti-skid and dirt-resistant thermoplastic elastomer and a preparation method thereof.The anti-skid and dirt-resistant thermoplastic elastomer comprises an elastomer A and an elastomer B, the weight ratio of the elastomer A to the elastomer B is (1-3): (1-3), and the anti-skid and dirt-resistant thermoplastic elastomer is obtained by mixing, extruding and molding all the components; the elastomer A is an organic silicon-polyurea thermoplastic elastomer and is prepared from the following raw materials in parts by weight: 30 to 50 parts of aminopropyl-terminated polydimethylsiloxane, 20 to 40 parts of polyether diamine and 10 to 20 parts of p-phenylene diisocyanate; the elastomer B is an organic silicon-polyurethane thermoplastic elastomer and is prepared from the following raw materials in parts by weight: 30 to 50 parts of hydroxyl-terminated polydimethylsiloxane, 20 to 40 parts of polypropylene glycol and 10 to 20 parts of isophorone diisocyanate. The thermoplastic elastomer provided by the invention has the advantages of better mechanical property, higher friction coefficient and surface water contact angle, skid resistance, dirt resistance and excellent comprehensive performance.

Description

Technical Field

[0001] The invention relates to the technical field of thermoplastic elastomers, and in particular to an anti-slip and dirt-resistant thermoplastic elastomer material and a preparation method thereof. Background Art

[0002] Thermoplastic elastomer TPE / TPR, also known as artificial rubber or synthetic rubber, has the characteristics of high strength, high resilience, injection molding, environmental protection, non-toxicity and safety, and a wide range of applications.

[0003] Polyurethane thermoplastic elastomer is a block polymer generated by the reaction of isocyanate compounds and hydroxyl compounds. It consists of two parts, a hard segment and a soft segment. The performance of the elastomer can be controlled by adjusting the molecular structure and ratio of the soft segment and the hard segment. Polyurea elastomer (SPUA), as a new branch of polyurethane materials, is prepared from isocyanate and polyamine as raw materials and has very excellent mechanical properties. Since the urea bond (—NH—CO—NH—) is a strong polar group, there are a large number of hydrogen bonds between polyurea molecules, forming a microphase separation structure similar to polyurethane, and the hard segment is dispersed in the soft segment matrix as a reinforcing phase. This special microstructure produces excellent macroscopic properties, such as impact resistance, high strength and adhesion, and is suitable for multifunctional materials in a variety of engineering application scenarios.

[0004] Polysiloxane is a typical flexible segment and can be used as a soft segment component of polyurethane elastomer to improve certain properties of traditional polyurethane, such as hydrophobicity, weather resistance, low temperature resistance and other properties. CN113004682 discloses a high resilience polyurethane / organic silicon thermoplastic elastomer and a preparation method thereof, wherein thermoplastic polyurethane, vinyl silicone rubber, compatibilizer, and reinforcing filler are blended and placed in an internal mixer for premixing, and a crosslinking agent is added to continue mixing to obtain a rubber-plastic blend; the rubber-plastic blend is added to a twin-screw extruder, a prepolymerization catalyst is added for prevulcanization, and a shear dispersion treatment is performed to obtain a polyurethane / organic silicon thermoplastic elastomer. Silicone rubber and polyurethane are easily mixed with compatibility and dispersibility problems, and the stability of material properties cannot be guaranteed. CN108285519A discloses an organosilicon-modified polyurethane elastomer and a preparation method thereof, wherein hydroxyalkyl polysiloxane is used as a soft segment, isocyanate and dihydroxy compound are used as hard segments, and polysiloxane-polyurethane is prepared, and the tensile strength of the elastomer can reach 18MPa. However, due to the high hard segment content of 40%, the elongation at break of polysiloxane-polyurethane is only 197%, which is much lower than that of conventional polyurethane with polyether as the soft segment.

[0005] Therefore, it is of great significance to develop a new thermoplastic elastomer containing silicone-polyurea and silicone-polyurethane, and to regulate and improve the performance of the elastomer so that it has better comprehensive performance. Summary of the invention

[0006] The object of the present invention is to provide a non-slip and dirt-resistant thermoplastic elastomer material and a preparation method thereof. The thermoplastic elastomer material has excellent mechanical properties, non-slip properties and dirt resistance, and has excellent applicability and broad application prospects.

[0007] To achieve the purpose of the present invention, the following technical scheme is adopted:

[0008] In one aspect, the present invention provides a non-slip and dirt-resistant thermoplastic elastomer, comprising an elastomer A and an elastomer B, wherein the weight ratio of the elastomer A to the elastomer B is (1-3):(1-3), and the components are mixed and extruded to obtain the obtained product;

[0009] The elastomer A is a silicone-polyurea thermoplastic elastomer, comprising the following raw materials in parts by weight: 30-50 parts of aminopropyl-terminated polydimethylsiloxane, 20-40 parts of polyether diamine and 10-20 parts of p-phenylene diisocyanate;

[0010] The elastomer B is a silicone-polyurethane thermoplastic elastomer, which comprises the following raw materials in parts by weight: 30-50 parts of terminal hydroxyl polydimethylsiloxane, 20-40 parts of polypropylene glycol and 10-20 parts of isophorone diisocyanate.

[0011] Furthermore, the preparation method of the elastomer A comprises the following steps:

[0012] S1, respectively putting the aminopropyl-terminated polydimethylsiloxane and the polyether diamine into a vacuum drying oven, dehydrating and drying them at 80-90° C. for 3-4 hours, and setting aside;

[0013] S2, adding the aminopropyl-terminated polydimethylsiloxane, polyether diamine, p-phenylene diisocyanate and dry tetrahydrofuran pretreated in step S1 into a reaction container, stirring and reacting at 2-8° C. for 0.5-1.5 h under a nitrogen atmosphere to obtain a prepolymer;

[0014] S3, after stirring the prepolymer obtained in S2 at room temperature for 5-12 hours, pour it into a polytetrafluoroethylene mold, place it in a fume hood to evaporate the residual solvent, and vacuum dry the product at 50-60°C for 24-36 hours to obtain a polyurea elastomer.

[0015] Furthermore, the preparation method of the elastomer B comprises the following steps:

[0016] S1, adding pre-dried hydroxy-terminated polydimethylsiloxane, polypropylene glycol and isophorone diisocyanate into a reaction kettle, and reacting at 70-85° C. for 30-60 minutes under a nitrogen atmosphere to obtain a prepolymer;

[0017] S2, adding a catalyst to the prepolymer obtained in step S1, stirring the reaction at 60-80°C for 3-6 hours, pouring it into a polytetrafluoroethylene mold, placing it in a fume hood to evaporate the residual solvent, and vacuum drying the product at 50-60°C for 24-36 hours to obtain a silicone-polyurethane thermoplastic elastomer.

[0018] As a preferred technical solution, the molecular weight of the aminopropyl-terminated polydimethylsiloxane is 1000-4000.

[0019] As a preferred technical solution, the molecular weight of the terminal hydroxyl polydimethylsiloxane is 1000-4000.

[0020] Furthermore, the catalyst is stannous octoate and / or dibutyltin dilaurate.

[0021] Furthermore, the catalyst is added in an amount of 0.1-2 parts.

[0022] Furthermore, the anti-slip and dirt-resistant thermoplastic elastomer also contains a processing aid.

[0023] Preferably, the processing aid comprises one or more of an antioxidant and a coupling agent.

[0024] In another aspect, the present invention also provides a method for preparing a non-slip and dirt-resistant thermoplastic elastomer, comprising the following steps: uniformly mixing the components and extruding at 200-310° C. to obtain the non-slip and dirt-resistant thermoplastic elastomer.

[0025] Beneficial effects of the present invention:

[0026] The anti-skid and dirt-resistant thermoplastic elastomer provided by the present invention is prepared by mixed extrusion of an organosilicon-polyurethane thermoplastic elastomer and an organosilicon-polyurethane thermoplastic elastomer, has good tensile strength and elongation at break, high friction coefficient and surface water contact angle, and can be anti-skid and dirt-resistant. The elastomer provided by the present invention combines the performance advantages of the two elastomers, and the soft and hard monomers are reasonably matched to give the material better comprehensive performance, and has good application prospects in the fields of anti-skid materials and dirt-resistant materials. DETAILED DESCRIPTION

[0027] The specific implementation methods of the technical solution of this specification are further described below through specific examples. These examples are for the purpose of describing the technical solution in detail, rather than for limiting the technical solution. Based on the examples in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0028] The reagents used in the present invention can be purchased from commercial sources, or the raw materials for further explanation are shown to be prepared by existing technologies.

[0029] The number average molecular weight of the raw material terminal aminopropyl polydimethylsiloxane in the following embodiments of the present invention is 2000 g / mol, and the structural formula is:

[0030]

[0031] The number average molecular weight of the raw material terminal hydroxyl polydimethylsiloxane in the following examples of the present invention is 2000 g / mol, and the structural formula is:

[0032]

[0033] Example 1

[0034] This embodiment provides a non-slip and dirt-resistant thermoplastic elastomer, comprising an elastomer A and an elastomer B, wherein the weight ratio of the elastomer A to the elastomer B is 3:2;

[0035] The elastomer A is a polyurea elastomer, comprising the following raw materials in parts by weight: 40 parts of aminopropyl-terminated polydimethylsiloxane, 30 parts of polyether diamine and 15 parts of p-phenylene diisocyanate;

[0036] The elastomer B is a silicone-polyurethane thermoplastic elastomer, which comprises the following raw materials in parts by weight: 40 parts of terminal hydroxyl polydimethylsiloxane, 25 parts of polypropylene glycol and 15 parts of isophorone diisocyanate.

[0037] The method for preparing the above-mentioned anti-slip and anti-fouling thermoplastic elastomer comprises the following steps:

[0038] (1) preparing elastomer A, comprising the following steps:

[0039] S1, respectively put the aminopropyl-terminated polydimethylsiloxane and the polyether diamine into a vacuum drying oven, dehydrate and dry them at 80-90° C. for 4 hours, and set them aside;

[0040] S2, adding the aminopropyl-terminated polydimethylsiloxane, polyether diamine, p-phenylene diisocyanate and dry tetrahydrofuran pretreated in step S1 into a reaction container, stirring and reacting at 5° C. for 0.5 h under a nitrogen atmosphere to obtain a prepolymer;

[0041] S3, after continuing to stir the prepolymer at room temperature for 12 hours, pour it into a polytetrafluoroethylene mold, place it in a fume hood to evaporate the residual solvent, and vacuum dry the product at 60°C for 24 hours to obtain a polyurea elastomer.

[0042] (2) preparing elastomer B, comprising the following steps:

[0043] S1, adding pre-dried hydroxy-terminated polydimethylsiloxane, polypropylene glycol and isophorone diisocyanate into a reaction kettle, and reacting at 85° C. for 30 minutes under a nitrogen atmosphere to obtain a prepolymer;

[0044] S2, adding stannous octoate to the prepolymer obtained in step S1, stirring and reacting at 80° C. for 4 hours, pouring into a polytetrafluoroethylene mold, placing in a fume hood to evaporate the residual solvent, and vacuum drying the product at 60° C. for 24 hours to obtain a silicone-polyurethane thermoplastic elastomer.

[0045] (3) Elastomer A and elastomer B are mixed evenly according to a certain proportion, and extruded at 220° C. to obtain the anti-slip and anti-fouling thermoplastic elastomer.

[0046] Example 2

[0047] This embodiment provides a non-slip and dirt-resistant thermoplastic elastomer, comprising an elastomer A and an elastomer B, wherein the weight ratio of the elastomer A to the elastomer B is 2:1;

[0048] The elastomer A is a polyurea elastomer, comprising the following raw materials in parts by weight: 50 parts of aminopropyl-terminated polydimethylsiloxane, 25 parts of polyether diamine and 18 parts of p-phenylene diisocyanate;

[0049] The elastomer B is a silicone-polyurethane thermoplastic elastomer, which comprises the following raw materials in parts by weight: 50 parts of terminal hydroxyl polydimethylsiloxane, 20 parts of polypropylene glycol and 18 parts of isophorone diisocyanate.

[0050] The method for preparing the above-mentioned anti-slip and anti-fouling thermoplastic elastomer comprises the following steps:

[0051] (1) preparing elastomer A, comprising the following steps:

[0052] S1, respectively putting the aminopropyl-terminated polydimethylsiloxane and the polyether diamine into a vacuum drying oven, dehydrating and drying at 80° C. for 4 h for later use;

[0053] S2, adding the aminopropyl-terminated polydimethylsiloxane, polyether diamine, p-phenylene diisocyanate and dry tetrahydrofuran pretreated in step S1 into a reaction container, stirring and reacting at 5° C. for 1 hour under a nitrogen atmosphere to obtain a prepolymer;

[0054] S3, after continuing to stir the prepolymer at room temperature for 10 hours, pour it into a polytetrafluoroethylene mold, place it in a fume hood to evaporate the residual solvent, and vacuum dry the product at 60°C for 24 hours to obtain a polyurea elastomer.

[0055] (2) preparing elastomer B, comprising the following steps:

[0056] S1, adding pre-dried hydroxy-terminated polydimethylsiloxane, polypropylene glycol and isophorone diisocyanate into a reaction kettle, and reacting at 75° C. for 40 minutes under a nitrogen atmosphere to obtain a prepolymer;

[0057] S2, adding stannous octoate to the prepolymer obtained in step S1, stirring and reacting at 80° C. for 5 hours, pouring into a polytetrafluoroethylene mold, placing in a fume hood to evaporate the residual solvent, and vacuum drying the product at 60° C. for 24 hours to obtain a silicone-polyurethane thermoplastic elastomer.

[0058] (3) Elastomer A and elastomer B are mixed evenly according to a certain proportion, and extruded at 225° C. to obtain the anti-slip and anti-fouling thermoplastic elastomer.

[0059] Example 3

[0060] This embodiment provides a non-slip and dirt-resistant thermoplastic elastomer, comprising an elastomer A and an elastomer B, wherein the weight ratio of the elastomer A to the elastomer B is 1:1;

[0061] The elastomer A is a polyurea elastomer, comprising the following raw materials in parts by weight: 40 parts of aminopropyl-terminated polydimethylsiloxane, 20 parts of polyether diamine and 15 parts of p-phenylene diisocyanate;

[0062] The elastomer B is a silicone-polyurethane thermoplastic elastomer, which comprises the following raw materials in parts by weight: 40 parts of terminal hydroxyl polydimethylsiloxane, 20 parts of polypropylene glycol and 15 parts of isophorone diisocyanate.

[0063] The method for preparing the above-mentioned anti-slip and anti-fouling thermoplastic elastomer comprises the following steps:

[0064] (1) preparing elastomer A, comprising the following steps:

[0065] S1, respectively putting the aminopropyl-terminated polydimethylsiloxane and the polyether diamine into a vacuum drying oven, dehydrating and drying at 80° C. for 4 h for later use;

[0066] S2, adding the aminopropyl-terminated polydimethylsiloxane, polyether diamine, p-phenylene diisocyanate and dry tetrahydrofuran pretreated in step S1 into a reaction container, stirring and reacting at 5° C. for 0.5 h under a nitrogen atmosphere to obtain a prepolymer;

[0067] S3, after continuing to stir the prepolymer at room temperature for 10 hours, pour it into a polytetrafluoroethylene mold, place it in a fume hood to evaporate the residual solvent, and vacuum dry the product at 60°C for 24 hours to obtain a polyurea elastomer.

[0068] (2) preparing elastomer B, comprising the following steps:

[0069] S1, adding pre-dried hydroxy-terminated polydimethylsiloxane, polypropylene glycol and isophorone diisocyanate into a reaction kettle, and reacting at 85° C. for 40 minutes under a nitrogen atmosphere to obtain a prepolymer;

[0070] S2, adding stannous octoate to the prepolymer obtained in step S1, stirring and reacting at 80° C. for 6 hours, pouring into a polytetrafluoroethylene mold, placing in a fume hood to evaporate the residual solvent, and vacuum drying the product at 60° C. for 24 hours to obtain a silicone-polyurethane thermoplastic elastomer.

[0071] (3) Elastomer A and elastomer B are mixed evenly according to a certain proportion, and extruded at 225° C. to obtain the anti-slip and anti-fouling thermoplastic elastomer.

[0072] Example 4

[0073] This embodiment provides a non-slip and dirt-resistant thermoplastic elastomer, comprising an elastomer A and an elastomer B, wherein the weight ratio of the elastomer A to the elastomer B is 1:2;

[0074] The elastomer A is a polyurea elastomer, comprising the following raw materials in parts by weight: 50 parts of aminopropyl-terminated polydimethylsiloxane, 40 parts of polyether diamine and 20 parts of p-phenylene diisocyanate;

[0075] The elastomer B is a silicone-polyurethane thermoplastic elastomer, which comprises the following raw materials in parts by weight: 50 parts of terminal hydroxyl polydimethylsiloxane, 40 parts of polypropylene glycol and 20 parts of isophorone diisocyanate.

[0076] The method for preparing the above-mentioned anti-slip and anti-fouling thermoplastic elastomer comprises the following steps:

[0077] (1) preparing elastomer A, comprising the following steps:

[0078] S1, respectively putting the aminopropyl-terminated polydimethylsiloxane and the polyether diamine into a vacuum drying oven, dehydrating and drying at 80° C. for 4 h for later use;

[0079] S2, adding the aminopropyl-terminated polydimethylsiloxane, polyether diamine, p-phenylene diisocyanate and dry tetrahydrofuran pretreated in step S1 into a reaction container, stirring and reacting at 5° C. for 0.5 h under a nitrogen atmosphere to obtain a prepolymer;

[0080] S3, after continuing to stir the prepolymer at room temperature for 10 hours, pour it into a polytetrafluoroethylene mold, place it in a fume hood to evaporate the residual solvent, and vacuum dry the product at 60° C. for 24 hours to obtain a polyurea elastomer.

[0081] (2) preparing elastomer B, comprising the following steps:

[0082] S1, adding pre-dried hydroxy-terminated polydimethylsiloxane, polypropylene glycol and isophorone diisocyanate into a reaction kettle, and reacting at 85° C. for 40 minutes under a nitrogen atmosphere to obtain a prepolymer;

[0083] S2, adding stannous octoate to the prepolymer obtained in step S1, stirring and reacting at 80° C. for 6 hours, pouring into a polytetrafluoroethylene mold, placing in a fume hood to evaporate the residual solvent, and vacuum drying the product at 60° C. for 24 hours to obtain a silicone-polyurethane thermoplastic elastomer.

[0084] (3) Elastomer A and elastomer B are mixed evenly according to a certain proportion, and extruded at 225° C. to obtain the anti-slip and anti-fouling thermoplastic elastomer.

[0085] Example 5

[0086] This embodiment provides a non-slip and dirt-resistant thermoplastic elastomer, comprising an elastomer A and an elastomer B, wherein the weight ratio of the elastomer A to the elastomer B is 1:1.5;

[0087] The elastomer A is a polyurea elastomer, comprising the following raw materials in parts by weight: 50 parts of aminopropyl-terminated polydimethylsiloxane, 40 parts of polyether diamine and 25 parts of p-phenylene diisocyanate;

[0088] The elastomer B is a silicone-polyurethane thermoplastic elastomer, which comprises the following raw materials in parts by weight: 50 parts of terminal hydroxyl polydimethylsiloxane, 30 parts of polypropylene glycol and 25 parts of isophorone diisocyanate.

[0089] The method for preparing the above-mentioned anti-slip and anti-fouling thermoplastic elastomer comprises the following steps:

[0090] (1) preparing elastomer A, comprising the following steps:

[0091] S1, respectively putting the aminopropyl-terminated polydimethylsiloxane and the polyether diamine into a vacuum drying oven, dehydrating and drying at 80° C. for 4 h for later use;

[0092] S2, adding the aminopropyl-terminated polydimethylsiloxane, polyether diamine, p-phenylene diisocyanate and dry tetrahydrofuran pretreated in step S1 into a reaction container, stirring and reacting at 5° C. for 0.5 h under a nitrogen atmosphere to obtain a prepolymer;

[0093] S3, after continuing to stir the prepolymer at room temperature for 12 hours, pour it into a polytetrafluoroethylene mold, place it in a fume hood to evaporate the residual solvent, and vacuum dry the product at 60° C. for 24 hours to obtain a polyurea elastomer.

[0094] (2) preparing elastomer B, comprising the following steps:

[0095] S1, adding pre-dried hydroxy-terminated polydimethylsiloxane, polypropylene glycol and isophorone diisocyanate into a reaction kettle, and reacting at 85° C. for 40 minutes under a nitrogen atmosphere to obtain a prepolymer;

[0096] S2, adding stannous octoate to the prepolymer obtained in step S1, stirring and reacting at 80° C. for 6 hours, pouring into a polytetrafluoroethylene mold, placing in a fume hood to evaporate the residual solvent, and vacuum drying the product at 60° C. for 24 hours to obtain a silicone-polyurethane thermoplastic elastomer.

[0097] (3) Elastomer A and elastomer B are mixed evenly according to a certain proportion, and extruded at 225° C. to obtain the anti-slip and anti-fouling thermoplastic elastomer.

[0098] Example 6

[0099] This embodiment provides a non-slip and dirt-resistant thermoplastic elastomer, comprising an elastomer A and an elastomer B, wherein the weight ratio of the elastomer A to the elastomer B is 1:3;

[0100] The elastomer A is a polyurea elastomer, comprising the following raw materials in parts by weight: 30 parts of aminopropyl-terminated polydimethylsiloxane, 40 parts of polyether diamine and 15 parts of p-phenylene diisocyanate;

[0101] The elastomer B is a silicone-polyurethane thermoplastic elastomer, which comprises the following raw materials in parts by weight: 30 parts of terminal hydroxyl polydimethylsiloxane, 40 parts of polypropylene glycol and 15 parts of isophorone diisocyanate.

[0102] The method for preparing the above-mentioned anti-slip and anti-fouling thermoplastic elastomer comprises the following steps:

[0103] (1) preparing elastomer A, comprising the following steps:

[0104] S1, respectively putting the aminopropyl-terminated polydimethylsiloxane and the polyether diamine into a vacuum drying oven, dehydrating and drying at 80° C. for 4 h for later use;

[0105] S2, adding the aminopropyl-terminated polydimethylsiloxane, polyether diamine, p-phenylene diisocyanate and dry tetrahydrofuran pretreated in step S1 into a reaction container, stirring and reacting at 5° C. for 0.5 h under a nitrogen atmosphere to obtain a prepolymer;

[0106] S3, after continuing to stir the prepolymer at room temperature for 8 hours, pour it into a polytetrafluoroethylene mold, place it in a fume hood to evaporate the residual solvent, and vacuum dry the product at 60° C. for 24 hours to obtain a polyurea elastomer.

[0107] (2) preparing elastomer B, comprising the following steps:

[0108] S1, adding pre-dried hydroxy-terminated polydimethylsiloxane, polypropylene glycol and isophorone diisocyanate into a reaction kettle, and reacting at 85° C. for 30 minutes under a nitrogen atmosphere to obtain a prepolymer;

[0109] S2, add stannous octoate to the prepolymer obtained in step S1, stir and react at 85°C for 6 hours, pour into a polytetrafluoroethylene mold, place in a fume hood to evaporate the residual solvent, and vacuum dry the product at 60°C for 24 hours to obtain a silicone-polyurethane thermoplastic elastomer.

[0110] (3) Elastomer A and elastomer B are mixed evenly according to a certain proportion, and extruded at 225° C. to obtain the anti-slip and anti-fouling thermoplastic elastomer.

[0111] Comparative Example 1

[0112] The difference between this comparative example and Example 1 is that the aminopropyl-terminated polydimethylsiloxane is not included in the preparation process of elastomer A, and the weight proportion of isophorone diisocyanate in elastomer B is 5 parts.

[0113] Comparative Example 2

[0114] The difference between this comparative example and Example 1 is that the hydroxy-terminated polydimethylsiloxane is not included in the preparation process of elastomer B, and the weight proportion of polyether diamine in elastomer A is 10 parts.

[0115] Comparative Example 3

[0116] The difference between this comparative example and Example 1 is that the preparation process of elastomer A does not include terminal aminopropyl polydimethylsiloxane, and the preparation process of elastomer B does not include terminal hydroxyl polydimethylsiloxane.

[0117] Performance Test:

[0118] 1. Tensile performance and anti-slip performance test: The tensile strength of the specimen was tested using a universal material testing machine in accordance with GB / T 528-2009 "Determination of tensile properties of plastics" at a tensile speed of 50 mm / min. The static friction coefficient of the specimen made of the elastomer of the present application was tested with reference to "GB / T 13826-2008 Wet (non-metallic) friction materials". The test results are shown in Table 1.

[0119] Table 1 Tensile properties and anti-slip test results

[0120]

[0121]

[0122] As can be seen from Table 1, the tensile strength, elongation at break and static friction coefficient of the elastomers prepared in Examples 1-6 are better than those prepared in Comparative Examples 1-3. In Comparative Example 1, since elastomer A does not include terminal aminopropyl polydimethylsiloxane, the content of hard monomers in elastomer B is also low, and the proportion of soft monomers in the structure of the synthesized elastomer B is relatively high; while in Comparative Example 2, the content of soft monomers in elastomer A is reduced, and elastomer B does not include terminal hydroxyl polydimethylsiloxane; in Comparative Example 3, elastomer A does not include terminal aminopropyl polydimethylsiloxane, and elastomer B does not include terminal hydroxyl polydimethylsiloxane, and the synthesized elastomer does not contain silicon. Since the different components of Comparative Examples 1-3 lead to changes in the internal structure of the elastomer, the tensile properties and anti-friction properties are not as good as those of the elastomers prepared in Examples 1-6. This shows that the elastomer provided by the present invention has better mechanical properties and anti-slip properties.

[0123] 2. Dirt resistance test

[0124] The static water contact angle test was carried out according to the ASTM D5946 test method, and the oily pen was used to draw the line 1 hour later and then the alcohol was wiped off. The test results are shown in Table 2.

[0125] Table 2 Dirt resistance test results

[0126]

[0127]

[0128] As shown in Table 2, compared with Comparative Examples 1-3, the elastomers prepared in Examples 1-6 of the present invention have higher water contact angles, and can be cleaned with alcohol after being drawn with an oily pen. Therefore, the thermoplastic elastomer provided by the present invention has good surface hydrophobicity and is resistant to dirt, and can be used as a dirt-resistant material.

[0129] Although the embodiments of the present description have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present description, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-slip and dirt-resistant thermoplastic elastomer, characterized in that: The invention comprises an elastomer A and an elastomer B, wherein the weight ratio of the elastomer A to the elastomer B is (1-3):(1-3), and each component is mixed and extruded to obtain the obtained product; The elastomer A is a silicone-polyurea thermoplastic elastomer, comprising the following raw materials in parts by weight: 30-50 parts of aminopropyl-terminated polydimethylsiloxane, 20-40 parts of polyether diamine and 10-20 parts of p-phenylene diisocyanate; The elastomer B is a silicone-polyurethane thermoplastic elastomer, which comprises the following raw materials in parts by weight: 30-50 parts of terminal hydroxyl polydimethylsiloxane, 20-40 parts of polypropylene glycol and 10-20 parts of isophorone diisocyanate.

2. The anti-slip and anti-fouling thermoplastic elastomer according to claim 1, characterized in that: The preparation method of the elastomer A comprises the following steps: S1, respectively put the aminopropyl-terminated polydimethylsiloxane and polyether diamine into a vacuum drying oven, dehydrate and dry them at 80-90°C for 3-4 hours, and set them aside; S2, adding the aminopropyl-terminated polydimethylsiloxane, polyether diamine, p-phenylene diisocyanate and dry tetrahydrofuran pretreated in step S1 into a reaction container, stirring and reacting at 2-8° C. for 0.5-1.5 h under a nitrogen atmosphere to obtain a prepolymer; S3, after stirring the prepolymer obtained in S2 at room temperature for 5-12 h, pour it into a polytetrafluoroethylene mold, place it in a fume hood to evaporate the residual solvent, and vacuum dry the product at 50-60 ° C for 24-36 h to obtain a polyurea elastomer.

3. The anti-slip and anti-fouling thermoplastic elastomer according to claim 1, characterized in that: The preparation method of the elastomer B, The steps include: S1, adding pre-dried hydroxy-terminated polydimethylsiloxane, polypropylene glycol and isophorone diisocyanate into a reaction kettle, and reacting at 70-85° C. for 30-60 min under a nitrogen atmosphere to obtain a prepolymer; S2, adding a catalyst to the prepolymer obtained in step S1, stirring the reaction at 60-80°C for 3-6 hours, pouring it into a polytetrafluoroethylene mold, placing it in a fume hood to evaporate the residual solvent, and vacuum drying the product at 50-60°C for 24-36 hours to obtain a silicone-polyurethane thermoplastic elastomer.

4. The anti-slip and anti-fouling thermoplastic elastomer according to claim 2, characterized in that: The molecular weight of the aminopropyl-terminated polydimethylsiloxane is 1000-4000.

5. The anti-slip and anti-fouling thermoplastic elastomer according to claim 3, characterized in that: The molecular weight of the terminal hydroxyl polydimethylsiloxane is 1000-4000.

6. The anti-slip and anti-fouling thermoplastic elastomer according to claim 3, characterized in that: The catalyst is stannous octoate and / or dibutyltin dilaurate.

7. The anti-slip and anti-fouling thermoplastic elastomer according to claim 3, characterized in that: The added amount of the catalyst is 0.1-2 parts.

8. The anti-slip and anti-fouling thermoplastic elastomer according to claim 1, characterized in that: Also contains processing aids.

9. The anti-slip and anti-fouling thermoplastic elastomer according to claim 1, characterized in that: The processing aid comprises one or more of an antioxidant and a coupling agent.

10. The method for preparing the anti-skid and anti-fouling thermoplastic elastomer according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing the components uniformly, and extruding at 200-310° C. to obtain the anti-slip and anti-fouling thermoplastic elastomer.

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