A kind of high wear-resistant composite material for plastic track and its preparation method

Abstract

The application relates to the technical field of high polymer materials, and discloses a kind of high wear-resistant plastic track composite material and preparation method thereof, a kind of high wear-resistant plastic track composite material includes the following weight parts of components: thermoplastic polyurethane 35~45 parts, styrene-butadiene rubber 10~15 parts, filler 20~30 parts, plasticizer 5~8 parts, antioxidant 3~5 parts, vulcanizing agent 2~3 parts, accelerator 1~1.5 parts;Filler is kaolin, graphite and modified chromium carbide;Modified chromium carbide is zinc oxide coated chromium carbide.Through the above technical scheme, the problem of low strength and poor wear resistance of the composite material for the plastic track in the related art is solved.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a high wear-resistant plastic running track composite material and its preparation method. Background Technology

[0002] Due to their excellent elasticity, slip resistance, and all-weather usability, synthetic running tracks are widely used in stadiums, school playgrounds, fitness trails, and other venues. However, with the increasing demand for fitness among the general public and the rising performance requirements of professional sporting events, the strength and wear resistance of synthetic running tracks have become key performance indicators. Under the influence of frequent human activity, equipment pressure, and natural environmental factors (such as ultraviolet radiation and rain), traditional synthetic running tracks often experience surface wear, cracking, and loss of elasticity. This not only affects the user experience but also necessitates frequent repairs and replacements, increasing maintenance costs and resource consumption.

[0003] To improve the mechanical strength and wear resistance of composite materials used in synthetic running tracks, existing technologies generally rely on adding fillers for performance enhancement. Commonly used fillers include calcium carbonate, talc, metal oxides, and ceramic particles. However, the hardness and reinforcing effect of fillers are limited, making it difficult to meet the demands of high wear resistance applications. Furthermore, while ceramic fillers such as chromium carbide possess high hardness and excellent wear resistance, their surface polarity differs significantly from that of the polymer matrix (such as rubber and thermoplastic polyurethane), leading to agglomeration within the matrix. This uneven dispersion not only fails to fully realize their wear-resistant reinforcing effect but may also create stress concentration points due to localized agglomeration, ultimately reducing the overall mechanical properties and service life of the composite material. Therefore, a high-wear-resistant composite material for synthetic running tracks is urgently needed. Summary of the Invention

[0004] This invention proposes a high wear-resistant composite material for plastic running tracks and its preparation method, which solves the problems of low strength and poor wear resistance of composite materials for plastic running tracks in related technologies.

[0005] The technical solution of the present invention is as follows:

[0006] This invention proposes a composite material for high wear-resistant plastic running tracks, comprising the following components in parts by weight: 35-45 parts of thermoplastic polyurethane, 10-15 parts of styrene-butadiene rubber, 20-30 parts of filler, 5-8 parts of plasticizer, 3-5 parts of antioxidant, 2-3 parts of vulcanizing agent, and 1-1.5 parts of accelerator.

[0007] The filler is kaolin, graphite and modified chromium carbide;

[0008] The modified chromium carbide is zinc oxide-coated chromium carbide.

[0009] As a further technical solution, the mass ratio of kaolin, graphite and modified chromium carbide is 2:1:2~3.4.

[0010] In the high wear-resistant plastic running track composite material of the present invention, by further adjusting the mass ratio of kaolin, graphite and modified chromium carbide (zinc oxide coated chromium carbide) in the filler to 2:1:2~3.4, the strength and wear resistance of the prepared plastic running track composite material can be further improved.

[0011] As a further technical solution, the method for preparing zinc oxide-coated chromium carbide includes the following steps: dissolving zinc acetate dihydrate in anhydrous ethanol to obtain solution A, dissolving oxalic acid in anhydrous ethanol to obtain solution B, dispersing chromium carbide in solution A, adding solution B, stirring, aging, drying, and calcining to obtain zinc oxide-coated chromium carbide.

[0012] As a further technical solution, in solution A, the mass-to-volume ratio of zinc acetate dihydrate and anhydrous ethanol is 30g:100~120mL;

[0013] Preferably, in solution A, the mass-to-volume ratio of zinc acetate dihydrate to anhydrous ethanol is 30 g: 100 mL.

[0014] As a further technical solution, the mass ratio of zinc acetate dihydrate to oxalic acid is 30:15~16;

[0015] The mass ratio of chromium carbide to zinc acetate dihydrate is 1:2~3.

[0016] As a further technical solution, the dissolution temperatures of solutions A and B during preparation are each independently 65~70℃;

[0017] The stirring temperature is 70~75℃;

[0018] The calcination temperature is 450~500℃.

[0019] As a further technical solution, the kaolin is polymethyl methacrylate modified kaolin;

[0020] The preparation method of the polymethyl methacrylate modified kaolin includes the following steps: melting and mixing kaolin and polymethyl methacrylate, cooling, to obtain polymethyl methacrylate modified kaolin.

[0021] In the filler of the high wear-resistant plastic running track composite material of this invention, kaolin is modified by polymethyl methacrylate (PMMA). PMMA binds to the surface of kaolin through hydrogen bonding, making the kaolin more uniformly dispersed in the polymer matrix. When the plastic running track composite material is subjected to external force, the uniformly dispersed modified kaolin can absorb the energy of the external force. Furthermore, it can improve the interfacial bonding force between kaolin and the polymer matrix, ultimately improving the strength and wear resistance of the plastic running track composite material.

[0022] As a further technical solution, the mass ratio of kaolin to polymethyl methacrylate is 100:6~8.

[0023] In the filler of the high wear-resistant plastic running track composite material of the present invention, when preparing polymethyl methacrylate modified kaolin, the strength and wear resistance of the composite material can be further improved by further adjusting the mass ratio of kaolin and polymethyl methacrylate to 100:6~8.

[0024] As a further technical solution, the melting and mixing temperature is 180~190℃.

[0025] As a further technical solution, the plasticizer includes one or both of paraffin oil and dioctyl phthalate.

[0026] In this invention, a high-wear-resistant plastic running track composite material is prepared by adding paraffin oil and / or dioctyl phthalate as plasticizers. Paraffin oil and dioctyl phthalate can weaken intermolecular forces and increase the flexibility and mobility of the molecular chains. This allows the molecular chains to better adapt to external forces when the composite material is subjected to friction, reducing material wear caused by localized stress concentration and improving the wear resistance of the composite material. Furthermore, the addition of plasticizers can also improve the dispersibility of fillers in the polymer matrix.

[0027] As a further technical solution, the antioxidant includes one or both of antioxidant 4010NA and antioxidant RD.

[0028] In this invention, the addition of antioxidant 4010NA and / or antioxidant RD to the high wear-resistant plastic running track composite material can improve the weather resistance of the composite material. Antioxidant 4010NA can interrupt the oxidation chain reaction and effectively inhibit the oxidation of the material, while antioxidant RD can form a protective film on the surface of the composite material, isolating the material from direct contact with ultraviolet rays and oxygen, thereby preventing the aging of the material.

[0029] As a further technical solution, the vulcanizing agent includes sulfur;

[0030] The accelerator includes accelerator DM.

[0031] In the high wear-resistant plastic running track composite material of this invention, sulfur, as a vulcanizing agent, decomposes into sulfur free radicals when heated. The sulfur free radicals can undergo a free radical chain reaction with the double bonds in the rubber molecular chain, forming sulfur bridges between the molecular chains, thereby constructing a three-dimensional network structure and improving the strength and elasticity of the composite material. The accelerator DM can promote the chain reaction of sulfur free radicals, shorten the vulcanization time, and improve the vulcanization efficiency.

[0032] The present invention also proposes a method for preparing a high wear-resistant plastic running track composite material, which includes the following steps: stirring and mixing the components of the high wear-resistant plastic running track composite material, kneading, and vulcanizing to obtain the high wear-resistant plastic running track composite material.

[0033] The working principle and beneficial effects of this invention are as follows:

[0034] In this invention, the strength and wear resistance of the composite material for plastic running tracks are improved by adding zinc oxide-coated chromium carbide, kaolin, and graphite as fillers. Specifically, to address the agglomeration problem of chromium carbide, zinc oxide is coated onto the surface of the chromium carbide, improving its agglomeration and allowing for more uniform dispersion within the polymer matrix. Simultaneously, the zinc oxide-coated chromium carbide is used in combination with graphite and kaolin, which act as reinforcing agents. Graphite enhances the self-lubricating function of the composite material and reduces the coefficient of friction, while kaolin reduces the wear rate. These three elements synergistically improve the strength and wear resistance of the resulting composite material for plastic running tracks. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] In the following examples and comparative examples, the styrene-butadiene rubber is model SBR 1502; the thermoplastic polyurethane is model T3185, manufactured by Dongguan Bailing New Materials Co., Ltd.; the polymethyl methacrylate is model CM-207; the average particle size of chromium carbide is 3 μm; the average particle size of kaolin is 0.5 μm; and the graphite is graphite powder with an average particle size of 20 μm.

[0037] Example 1

[0038] A composite material for high wear-resistant plastic running tracks comprises the following components in parts by weight: 35 parts thermoplastic polyurethane, 10 parts styrene-butadiene rubber, 20 parts filler, 5 parts paraffin oil, 3 parts antioxidant 4010NA, 2 parts sulfur, and 1 part accelerator DM.

[0039] The filler consists of 5 parts zinc oxide-coated chromium carbide, 10 parts kaolin, and 5 parts graphite.

[0040] The preparation method of zinc oxide coated chromium carbide includes the following steps: dissolving 30g of zinc acetate dihydrate in 100mL of anhydrous ethanol at 65℃ to obtain solution A; dissolving 15g of oxalic acid in 100mL of anhydrous ethanol at 65℃ to obtain solution B; dispersing 10g of chromium carbide in solution A; adding solution B; stirring at 70℃; aging; drying; and calcining at 450℃ to obtain zinc oxide coated chromium carbide.

[0041] A method for preparing a high wear-resistant plastic running track composite material includes the following steps: stirring and mixing the components of the high wear-resistant plastic running track composite material, kneading, and vulcanizing to obtain the high wear-resistant plastic running track composite material.

[0042] Example 2

[0043] A composite material for high wear-resistant plastic running tracks comprises the following components in parts by weight: 45 parts thermoplastic polyurethane, 15 parts styrene-butadiene rubber, 30 parts filler, 4 parts paraffin oil, 4 parts dioctyl phthalate, 2.5 parts antioxidant 4010NA, 2.5 parts antioxidant RD, 3 parts sulfur, and 1.5 parts accelerator DM.

[0044] The filler consists of 7.5 parts zinc oxide-coated chromium carbide, 15 parts kaolin, and 7.5 parts graphite.

[0045] The preparation method of zinc oxide coated chromium carbide includes the following steps: dissolving 30g of zinc acetate dihydrate in 100mL of anhydrous ethanol at 70℃ to obtain solution A; dissolving 16g of oxalic acid in 100mL of anhydrous ethanol at 70℃ to obtain solution B; dispersing 15g of chromium carbide in solution A; adding solution B; stirring at 75℃; aging; drying; and calcining at 500℃ to obtain zinc oxide coated chromium carbide.

[0046] A method for preparing a high wear-resistant plastic running track composite material includes the following steps: stirring and mixing the components of the high wear-resistant plastic running track composite material, kneading, and vulcanizing to obtain the high wear-resistant plastic running track composite material.

[0047] Example 3

[0048] A composite material for high wear-resistant plastic running tracks comprises the following components in parts by weight: 40 parts thermoplastic polyurethane, 12 parts styrene-butadiene rubber, 24 parts filler, 6 parts dioctyl phthalate, 4 parts antioxidant RD, 2.5 parts sulfur, and 1 part accelerator DM.

[0049] The filler consists of 6 parts zinc oxide-coated chromium carbide, 12 parts kaolin, and 6 parts graphite.

[0050] The preparation method of zinc oxide coated chromium carbide includes the following steps: dissolving 30g of zinc acetate dihydrate in 100mL of anhydrous ethanol at 68℃ to obtain solution A; dissolving 15.5g of oxalic acid in 100mL of anhydrous ethanol at 68℃ to obtain solution B; dispersing 12g of chromium carbide in solution A; adding solution B; stirring at 73℃; aging; drying; and calcining at 480℃ to obtain zinc oxide coated chromium carbide.

[0051] A method for preparing a high wear-resistant plastic running track composite material includes the following steps: stirring and mixing the components of the high wear-resistant plastic running track composite material, kneading, and vulcanizing to obtain the high wear-resistant plastic running track composite material.

[0052] Example 4

[0053] The only difference between this embodiment and Embodiment 3 is that the filler is 9.6 parts zinc oxide coated chromium carbide, 9.6 parts kaolin, and 4.8 parts graphite.

[0054] Example 5

[0055] The only difference between this embodiment and Embodiment 3 is that the filler is 12 parts zinc oxide coated chromium carbide, 8 parts kaolin, and 4 parts graphite.

[0056] Example 6

[0057] The only difference between this embodiment and Embodiment 3 is that the filler is 12.75 parts zinc oxide coated chromium carbide, 7.5 parts kaolin, and 3.75 parts graphite.

[0058] Example 7

[0059] The only difference between this embodiment and Embodiment 3 is that the filler is 14.4 parts zinc oxide coated chromium carbide, 6.4 parts kaolin, and 3.2 parts graphite.

[0060] Example 8

[0061] The only difference between this embodiment and Example 5 is that kaolin is replaced with polymethyl methacrylate modified kaolin. The preparation method of polymethyl methacrylate modified kaolin includes the following steps: 100 parts by weight of kaolin and 6 parts by weight of polymethyl methacrylate are melt-mixed at 180°C and cooled to obtain polymethyl methacrylate modified kaolin.

[0062] Example 9

[0063] The only difference between this embodiment and Example 5 is that kaolin is replaced with polymethyl methacrylate modified kaolin. The preparation method of polymethyl methacrylate modified kaolin includes the following steps: 100 parts by weight of kaolin and 8 parts by weight of polymethyl methacrylate are melt-mixed at 190°C and cooled to obtain polymethyl methacrylate modified kaolin.

[0064] Comparative Example 1

[0065] The only difference between this comparative example and Example 3 is that the filler is 8 parts zinc oxide coated chromium carbide and 16 parts kaolin.

[0066] Comparative Example 2

[0067] The only difference between this comparative example and Example 3 is that the filler is 12 parts zinc oxide coated chromium carbide and 12 parts graphite.

[0068] Comparative Example 3

[0069] The only difference between this comparative example and Example 3 is that the filler is 16 parts kaolin and 8 parts graphite.

[0070] Comparative Example 4

[0071] The only difference between this comparative example and Example 3 is that zinc oxide coated chromium carbide is replaced with chromium carbide.

[0072] The performance of the high abrasion-resistant plastic running track composite materials prepared in Examples 1-9 and Comparative Examples 1-4 were tested respectively:

[0073] Tensile strength: The test was conducted according to the test method in standard GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", and the specimen was a type 1 dumbbell shape.

[0074] Abrasion resistance: The abrasion amount was tested according to the test method in standard GB / T 1689-2014 "Determination of abrasion resistance of vulcanized rubber (using Akron abrasion tester)";

[0075] The results are shown in Table 1 below.

[0076] Table 1 Performance Test Results

[0077]

[0078] Comparing the data from Examples 3 and 1-4, the composite material prepared by using zinc oxide-coated chromium carbide, kaolin, and graphite in Example 3 exhibits higher tensile strength and lower wear, indicating that the combination of zinc oxide-coated chromium carbide, kaolin, and graphite can improve the strength and wear resistance of the prepared composite material. Comparing the data from Examples 3-7, the composite materials prepared by Examples 4-6 exhibit higher tensile strength and lower wear, indicating that further adjusting the mass ratio of zinc oxide-coated chromium carbide, kaolin, and graphite, and further improving the strength and wear resistance of the prepared composite material when the mass ratio is 2-3.4:2:1, can further enhance its strength and wear resistance.

[0079] By comparing the data from Examples 5 and 8-9, the composite materials prepared by using polymethyl methacrylate-modified kaolin in Examples 8-9 showed higher tensile strength and less wear, indicating that the strength and wear resistance of the prepared composite materials can be improved by using polymethyl methacrylate-modified kaolin.

[0080] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite material for high wear-resistant plastic running tracks, characterized in that, The product comprises the following components in parts by weight: 35-45 parts thermoplastic polyurethane, 10-15 parts styrene-butadiene rubber, 20-30 parts filler, 5-8 parts plasticizer, 3-5 parts antioxidant, 2-3 parts vulcanizing agent, and 1-1.5 parts accelerator. The filler is kaolin, graphite and modified chromium carbide; The modified chromium carbide is zinc oxide-coated chromium carbide; The mass ratio of kaolin, graphite and modified chromium carbide is 2:1:2~3.

4.

2. The composite material for high wear-resistant plastic running tracks according to claim 1, characterized in that, The method for preparing zinc oxide-coated chromium carbide includes the following steps: dissolving zinc acetate dihydrate in anhydrous ethanol to obtain solution A, dissolving oxalic acid in anhydrous ethanol to obtain solution B, dispersing chromium carbide in solution A, adding solution B, stirring, aging, drying, and calcining to obtain zinc oxide-coated chromium carbide.

3. The composite material for high wear-resistant plastic running tracks according to claim 2, characterized in that, The mass ratio of zinc acetate dihydrate to oxalic acid is 30:15~16; The mass ratio of chromium carbide to zinc acetate dihydrate is 1:2~3.

4. The composite material for high wear-resistant plastic running tracks according to claim 2, characterized in that, The dissolution temperatures of solutions A and B during preparation are each independently 65~70℃; The stirring temperature is 70~75℃; The calcination temperature is 450~500℃.

5. The composite material for high wear-resistant plastic running tracks according to claim 1, characterized in that, The kaolin is polymethyl methacrylate modified kaolin; The preparation method of the polymethyl methacrylate modified kaolin includes the following steps: melting and mixing kaolin and polymethyl methacrylate, cooling, to obtain polymethyl methacrylate modified kaolin.

6. The composite material for high wear-resistant plastic running tracks according to claim 5, characterized in that, The mass ratio of kaolin to polymethyl methacrylate is 100:6~8; The melting and mixing temperature is 180~190℃.

7. The composite material for high wear-resistant plastic running tracks according to claim 1, characterized in that, The plasticizer includes one or both of paraffin oil and dioctyl phthalate; The antioxidant includes one or both of antioxidant 4010NA and antioxidant RD.

8. The composite material for high wear-resistant plastic running tracks according to claim 1, characterized in that, The vulcanizing agent includes sulfur; The accelerator includes accelerator DM.

9. A method for preparing a high wear-resistant composite material for plastic running tracks, used to prepare the high wear-resistant composite material for plastic running tracks as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The components of the high wear-resistant plastic running track composite material are stirred, mixed, kneaded, and vulcanized to obtain the high wear-resistant plastic running track composite material.

Images