Thermoplastic composite material composition, thermoplastic composite material as well as preparation method and application of thermoplastic composite material

Abstract

The invention relates to the technical field of thermoplastic elastomer material production, and discloses a thermoplastic composite material composition, a thermoplastic composite material, and a preparation method and application thereof. The thermoplastic composite material composition contains an SBCs thermoplastic elastomer, polypropylene, filling oil, a carbon-based heat-conducting filler, a carbon-based reinforcing material and a dispersant, the SBCs thermoplastic elastomer contains maleic anhydride modified SEBS, relative to 100 parts by weight of the SBCs elastomer, the content of the filling oil is 50-120 parts by weight, and the content of the carbon-based heat-conducting filler is 50-120 parts by weight. The content of the polypropylene is 20-80 parts by weight, the content of the carbon-based heat-conducting filler is 10-60 parts by weight, the content of the carbon-based reinforcing material is 5-35 parts by weight, and the content of the dispersing agent is 1-10 parts by weight. The thermoplastic composite material obtained by using the composition disclosed by the invention has high thermal conductivity and high strength and is excellent in comprehensive performance.

Description

Technical Field

[0001] This invention relates to the field of thermoplastic elastomer material production technology, specifically to a thermoplastic composite material composition, a thermoplastic composite material, its preparation method, and its application. Background Technology

[0002] Tire safety is paramount. Statistics show that 70% of highway accidents are caused by tire blowouts. The main reason for blowouts is that the tire's internal heat cannot dissipate quickly enough during high-speed driving, leading to a decrease in the strength of the tire materials. Frequent accidents have made consumers increasingly aware of tire safety. Meanwhile, approximately 200 million tires are prematurely scrapped globally each year due to blowouts. Achieving inherent tire safety and leading industry development with innovative thinking has become a hot topic for many companies' research and development. In 2004, Michelin pioneered the world's first revolutionary, airless concept wheel, Vision. Compared to traditional tires, Vision has a unique honeycomb structure that does not require compressed air to maintain its shape. It features airless operation, puncture resistance, lightweight design, and easy recyclability, making it particularly suitable for new energy vehicles for future autonomous driving scenarios, all-terrain vehicles, intelligent vehicles operating in harsh environments, industrial robots, and special transport and rescue vehicles.

[0003] Future green cars will be equipped with new low-environmental-impact tires, a sustainable change that will reduce vehicle emissions and pollution from all angles. Obtaining high-performance thermally conductive composite materials suitable for pneumatic tires is a current research hotspot for institutions both domestically and internationally. CN113817265A discloses a low-filler, high-thermal-conductivity polypropylene / SEBS composite material and its preparation method. While this method improves the thermal conductivity of the composite material to some extent, increasing it from 0.183 W / mK to 0.285 W / mK, the improvement is not significant and still cannot meet the thermal conductivity requirements of tires. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of thermal conductivity and other properties in the prior art, and to provide a thermoplastic composite material composition, a thermoplastic composite material, a preparation method thereof, and its application. The thermoplastic composite material obtained using the composition of this invention has both high thermal conductivity and high strength, and excellent overall performance.

[0005] The inventors of this invention discovered through research that current methods for improving thermal conductivity mainly involve selecting fillers with strong polarity. These fillers are difficult to disperse uniformly in small sizes within a non-polar rubber-plastic matrix; they can only be dispersed in larger sizes within the matrix. Although this achieves the goal of improving thermal conductivity, the composite material has poor tensile and elongation properties, failing to meet the strength requirements of tires. Therefore, the inventors of this invention further discovered that by using maleic anhydride-modified SEBS in SBCs-type thermoplastic elastomers, combined with carbon-based thermally conductive fillers, carbon-based reinforcing materials, and dispersants, a thermoplastic composite material with excellent comprehensive performance, possessing both high thermal conductivity and high strength, can be obtained. This led to the completion of this invention.

[0006] Therefore, the first aspect of the present invention provides a thermoplastic composite material composition, wherein the composition contains an SBC-type thermoplastic elastomer, polypropylene, a filler oil, a carbon-based thermally conductive filler, a carbon-based reinforcing material, and a dispersant, wherein the SBC-type thermoplastic elastomer contains maleic anhydride-modified SEBS, and relative to 100 parts by weight of the SBC-type elastomer, the filler oil content is 50-120 parts by weight, the polypropylene content is 20-80 parts by weight, the carbon-based thermally conductive filler content is 10-60 parts by weight, the carbon-based reinforcing material content is 5-35 parts by weight, and the dispersant content is 1-10 parts.

[0007] Preferably, relative to 100 parts by weight of SBCs elastomer, the content of the filler oil is 80-100 parts by weight, the content of the polypropylene is 30-60 parts by weight, the content of the carbon-based thermally conductive filler is 20-40 parts by weight, the content of the carbon-based reinforcing material is 10-25 parts by weight, and the content of the dispersant is 2-5 parts.

[0008] Preferably, the SBCs elastomer is maleic anhydride modified SEBS or maleic anhydride modified SEBS and SEBS.

[0009] Preferably, the SBCs elastomer contains more than 70% by weight of maleic anhydride-modified SEBS, and more preferably contains 80-100% by weight of maleic anhydride-modified SEBS.

[0010] Preferably, the carbon-based thermally conductive filler is one or more of carbon fiber, carbon nanotubes, thermally conductive carbon black, graphite and carbonyl iron powder, and more preferably carbon fiber or carbon fiber and carbon nanotubes.

[0011] Preferably, the filler oil is paraffin oil and / or naphthenic oil.

[0012] Preferably, the carbon-based reinforcing material is carbon black.

[0013] Preferably, the propylene is one or more of homopolymer polypropylene, copolymer polypropylene, and modified polypropylene.

[0014] Preferably, the dispersant is polyethylene glycol.

[0015] Preferably, the composition further contains an antioxidant, wherein the antioxidant content is 1-10 parts by weight, preferably 3-6 parts by weight, relative to 100 parts by weight of SBCs elastomer.

[0016] According to a second aspect of the present invention, a thermoplastic composite material is provided, wherein the thermoplastic composite material is prepared using the thermoplastic composite material composition described in the first aspect of the present invention.

[0017] According to a third aspect of the present invention, a method for preparing a thermoplastic composite material is provided, wherein the method uses the thermoplastic composite material composition described in the first aspect of the present invention as a raw material.

[0018] Preferably, the method for preparing the thermoplastic composite material includes:

[0019] 1) The step of mixing SBCs type thermoplastic elastomer and filler oil to obtain masterbatch;

[0020] 2) The step of first mixing the masterbatch, polypropylene, carbon-based reinforcing material and optional antioxidant, and then second mixing with carbon-based thermally conductive filler and dispersant to obtain masterbatch.

[0021] 3) The step of extruding and granulating the masterbatch.

[0022] Preferably, the conditions for the first mixing include: a temperature of 160-190°C and a time of 1-3 minutes.

[0023] Preferably, the conditions for the second mixing include: a temperature of 160-190°C and a time of 2-5 minutes.

[0024] According to a fourth aspect of the present invention, the application of a thermoplastic composite material prepared by the method of preparing the thermoplastic composite material according to the second aspect of the present invention or the thermoplastic composite material according to the third aspect of the present invention in the preparation of pneumatic tires is provided.

[0025] The thermoplastic composite material obtained by using the composition of the present invention has both high thermal conductivity and high strength, and excellent overall performance. Detailed Implementation

[0026] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0027] In a first aspect, the present invention provides a thermoplastic composite material composition, wherein the composition comprises a SBC-type thermoplastic elastomer, polypropylene, a filler oil, a carbon-based thermally conductive filler, a carbon-based reinforcing material, and a dispersant, wherein the SBC-type thermoplastic elastomer comprises maleic anhydride-modified SEBS, and relative to 100 parts by weight of the SBC-type elastomer, the filler oil content is 50-120 parts by weight, the polypropylene content is 20-80 parts by weight, the carbon-based thermally conductive filler content is 10-60 parts by weight, the carbon-based reinforcing material content is 5-35 parts by weight, and the dispersant content is 1-10 parts.

[0028] According to the present invention, from the viewpoint of further improving thermal conductivity and mechanical strength, preferably, relative to 100 parts by weight of SBCs elastomer, the content of the filler oil is 80-100 parts by weight, the content of the polypropylene is 30-60 parts by weight, the content of the carbon-based thermally conductive filler is 20-40 parts by weight, the content of the carbon-based reinforcing material is 10-25 parts by weight, and the content of the dispersant is 2-5 parts.

[0029] Specific examples of the content of the filler oil relative to 100 parts by weight of SBCs elastomer include, for example: 50 parts by weight, 52 parts by weight, 55 parts by weight, 57 parts by weight, 60 parts by weight, 62 parts by weight, 65 parts by weight, 67 parts by weight, 70 parts by weight, 72 parts by weight, 75 parts by weight, 77 parts by weight, 80 parts by weight, 82 parts by weight, 85 parts by weight, 87 parts by weight, 90 parts by weight, 92 parts by weight, 95 parts by weight, 97 parts by weight, 100 parts by weight, 105 parts by weight, 110 parts by weight, 115 parts by weight, 120 parts by weight, etc., as well as any range of any two of the above values.

[0030] Specific examples of the polypropylene content relative to 100 parts by weight of SBCs elastomers include, for example, 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, 36 parts by weight, 38 parts by weight, 40 parts by weight, 42 parts by weight, 44 parts by weight, 46 parts by weight, 48 parts by weight, 50 parts by weight, 52 parts by weight, 54 parts by weight, 56 parts by weight, 58 parts by weight, 60 parts by weight, 62 parts by weight, 64 parts by weight, 66 parts by weight, 68 parts by weight, 70 parts by weight, 72 parts by weight, 74 parts by weight, 76 parts by weight, 78 parts by weight, 80 parts by weight, etc., as well as any range formed by any two of the above values.

[0031] Specific examples of the content of the carbon-based thermally conductive filler relative to 100 parts by weight of SBCs elastomer include, for example, 10 parts by weight, 12 parts by weight, 14 parts by weight, 16 parts by weight, 18 parts by weight, 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, 36 parts by weight, 38 parts by weight, 40 parts by weight, 42 parts by weight, 44 parts by weight, 46 parts by weight, 48 parts by weight, 50 parts by weight, 52 parts by weight, 54 parts by weight, 56 parts by weight, 58 parts by weight, 60 parts by weight, etc., as well as any range formed by any two of the above values.

[0032] Specific examples of the content of the carbon-based reinforcing material relative to 100 parts by weight of SBCs-type elastomers include, for example, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, etc., as well as any range formed by any two of the above values.

[0033] Specific examples of the content of the dispersant relative to 100 parts by weight of SBCs elastomers include, for example, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, and any range of any two of the above values.

[0034] According to the present invention, from the viewpoint of further improving thermal conductivity and mechanical strength, the SBCs type elastomer is preferably maleic anhydride modified SEBS or maleic anhydride modified SEBS and SEBS.

[0035] According to the present invention, from the viewpoint of further improving thermal conductivity and mechanical strength, preferably, the SBCs-type elastomer contains more than 70% by weight of maleic anhydride-modified SEBS; more preferably, the SBCs-type elastomer contains 80-100% by weight of maleic anhydride-modified SEBS. For example, the content of maleic anhydride-modified SEBS in the SBCs-type elastomer can be: 70% by weight, 72% by weight, 74% by weight, 76% by weight, 78% by weight, 80% by weight, 82% by weight, 84% by weight, 86% by weight, 88% by weight, 90% by weight, 92% by weight, 94% by weight, 96% by weight, 98% by weight, 100% by weight, etc.

[0036] In a preferred embodiment of the present invention, the SBCs elastomer is maleic anhydride modified SEBS.

[0037] In another preferred embodiment of the present invention, the SBCs elastomer is maleic anhydride modified SEBS and SEBS, and the SBCs elastomer contains more than 80% by weight of maleic anhydride modified SEBS.

[0038] According to the present invention, the maleic anhydride modified SEBS is preferably maleic anhydride-grafted SEBS with a grafting rate of 1.2-2, and more preferably maleic anhydride-grafted SEBS with a grafting rate of 1.5-1.7.

[0039] In a particularly preferred embodiment of the present invention, the maleic anhydride modified SEBS is maleic anhydride-grafted SEBS with a grafting rate of 1.6.

[0040] In this invention, the maleic anhydride-modified SEBS can be prepared according to conventional methods in the art or can be obtained commercially, for example, maleic anhydride-grafted SEBS purchased from Lee Chang Yung Chemical Co., Ltd. in Taiwan, China.

[0041] In this invention, by using maleic anhydride-modified SEBS in SBCs-type thermoplastic elastomers, combined with carbon-based thermally conductive fillers, carbon-based reinforcing materials, and dispersants, a thermoplastic composite material with excellent comprehensive performance, combining high thermal conductivity and high strength, can be obtained.

[0042] Preferably, the carbon-based thermally conductive filler is one or more of carbon fiber, carbon nanotubes, thermally conductive carbon black, graphite, and carbonyl iron powder; more preferably, the carbon-based thermally conductive filler is carbon fiber or carbon fiber and carbon nanotubes.

[0043] In a preferred embodiment of the present invention, the particle size of the carbon fiber is 100-1600 mesh.

[0044] According to the present invention, preferably, the carbon-based reinforcing material is carbon black; more preferably, the reinforcing material is carbon black with a particle size of 5-25 nm.

[0045] According to the present invention, there are no particular limitations on the filler oil, and various filler oils commonly used in the art can be used. Preferably, the filler oil is paraffin oil and / or naphthenic oil.

[0046] According to the present invention, preferably, the polypropylene is one or more of homopolymer polypropylene, copolymer polypropylene and modified polypropylene; more preferably, the propylene is homopolymer polypropylene and / or copolymer polypropylene.

[0047] According to the present invention, preferably, the melt index of the polypropylene at 230°C and under a load of 2.16 kg is 1-20 g / 10 min, more preferably 3-15 g / 10 min. To further improve the mechanical properties of the vulcanized rubber, preferably, the comonomer of the random copolymer polypropylene is ethylene.

[0048] As a specific example of the homopolymer polypropylene, Formosa Plastics product F401, etc., can be used.

[0049] As a specific example of the copolymer polypropylene, Formosa Plastics product 5090T, etc., can be used.

[0050] According to the present invention, preferably, the dispersant is polyethylene glycol; more preferably, the molecular weight of the polyethylene glycol is 1000-10000 g / mol, and even more preferably 2000-5000 g / mol.

[0051] As a specific example of the aforementioned polyethylene glycol, PEG4000 from Nanjing Runbang Chemical Co., Ltd., etc., can be used.

[0052] According to the present invention, in order to further improve the antioxidant properties, preferably, the composition further contains an antioxidant, wherein the antioxidant content is 1-10 parts by weight relative to 100 parts by weight of SBCs elastomer; more preferably, the antioxidant content is 3-6 parts by weight relative to 100 parts by weight of SBCs elastomer.

[0053] There is no particular limitation on the type of antioxidant, and various antioxidants commonly used in the art can be used, such as antioxidant 1076, antioxidant 1010, etc.

[0054] According to a second aspect of the present invention, a thermoplastic composite material is provided, wherein the thermoplastic composite material is prepared using the thermoplastic composite material composition described in the first aspect of the present invention.

[0055] According to a third aspect of the present invention, a method for preparing a thermoplastic composite material is provided, wherein the method uses the thermoplastic composite material composition described in the first aspect of the present invention as a raw material.

[0056] According to the present invention, preferably, the method for preparing the thermoplastic composite material includes:

[0057] 1) The step of mixing SBCs type thermoplastic elastomer and filler oil to obtain masterbatch;

[0058] 2) The step of first mixing the masterbatch, polypropylene, carbon-based reinforcing material and optional antioxidant, and then second mixing with carbon-based thermally conductive filler and dispersant to obtain masterbatch.

[0059] 3) The step of extruding and granulating the masterbatch.

[0060] In step 1), the mixing can be carried out in a mixing apparatus commonly used in the art, for example, a high-speed mixer.

[0061] The preferred temperature for mixing is 5-45°C (room temperature), that is, the mixing is preferably carried out at room temperature.

[0062] There is no particular limitation on the mixing time, as long as the mixture is homogeneous. For example, when using a high-speed mixer, the mixing time can be 5-10 minutes.

[0063] Preferably, in step 1), after mixing, the mixture is left to stand for 3-10 hours, and the standing temperature can be, for example, 5-45°C (room temperature).

[0064] In step 2), the first mixing and the second mixing can be carried out in mixing apparatus commonly used in the art, such as internal mixers.

[0065] Preferably, in step 2), the conditions for the first mixing include: a temperature of 160-190°C and a time of 1-3 minutes.

[0066] Preferably, in step 2), the conditions for the second mixing include: a temperature of 160-190°C and a time of 2-5 minutes.

[0067] In step 3), the extrusion granulation can be carried out in an extrusion apparatus commonly used in the art, such as a single-screw extruder.

[0068] Preferably, in step 3), the extrusion temperature is 160-190°C.

[0069] In a particularly preferred embodiment of the present invention, the method for preparing the thermoplastic composite material includes:

[0070] (1) Mix SBCs type thermoplastic elastomer and filler oil in a high-speed mixer for 5-10 minutes, and then let it stand for 3-10 hours to obtain masterbatch;

[0071] (2) Add the masterbatch, polypropylene, carbon-based reinforcing material and antioxidant to the internal mixer and mix for the first time at 160-190℃ for 1-3 minutes;

[0072] (3) Add carbon-based thermally conductive filler and dispersant, and mix for a second time at 160-190℃ for 2-5 minutes to obtain masterbatch;

[0073] (4) The masterbatch is extruded and granulated in a single screw extruder at an extrusion temperature of 160-190℃ to obtain composite material masterbatch.

[0074] According to a fourth aspect of the present invention, the application of a thermoplastic composite material prepared by the method of preparing the thermoplastic composite material according to the second aspect of the present invention or the thermoplastic composite material according to the third aspect of the present invention in the preparation of pneumatic tires is provided.

[0075] The present invention will be described in detail below through embodiments, but the present invention is not limited to the following embodiments.

[0076] The materials, equipment, and testing methods used are described below:

[0077] Homopolymer polypropylene F401 and copolymer polypropylene 5090T are Formosa Plastics products, with melt flow indices of 3 g / 10 min and 15 g / 10 min, respectively.

[0078] SEBS9901 is maleic anhydride-grafted SEBS, purchased from Lee Chang Yung Chemical Co., Ltd. in Taiwan, with a grafting rate of 1.6%.

[0079] SEBS6151 is a product purchased from TSRC Corporation.

[0080] The 200-mesh and 1500-mesh CNF (carbon nanofibers) were purchased from Toray Industries, Inc., Japan.

[0081] CNTs are industrial-grade carboxyl multiwalled carbon nanotubes, purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd.

[0082] White Oil 320 is a product purchased from PetroChina's Karamay Oilfield;

[0083] Carbon black N347 is a high-structure carbon black, purchased from Continental Carbon Company in the United States.

[0084] Antioxidant 1076 was purchased from Gaoyi County Lihe Chemical Co., Ltd.

[0085] PEG4000 (polyethylene glycol) was purchased from Nanjing Runbang Chemical Co., Ltd., and its molecular weight is 4000.

[0086] The internal mixer and single screw combination equipment is Kunshan Jiudelong JDL-10T model, with a mold cavity volume of 10L, and the heating system is electric heating with cooling function;

[0087] The injection molding machine is a vertical plastic injection molding machine from Dongguan Taiwang Machinery Co., Ltd.

[0088] Tensile strength test: AG-20KNG tensile testing machine, tested according to national standard GB / T528-2009, tensile rate 500 mm / min, test temperature approximately 23℃. The effective part length of the specimen is 25 mm, and the width is 6 mm.

[0089] Thermal conductivity testing: The sample size was 60mm*60mm*1mm. Thermal conductivity was tested using a Swedish Hot Disk TPS2500s probe with a 5465 polyimide F1 thermal conductivity probe. Smooth surfaces of the sample were preferred for testing.

[0090] Example 1

[0091] (1) Add 2668g SEBS9901 and 2134g white oil 320 to a high-speed mixer, mix for 7 minutes, and then let stand for 4 hours. After the white oil is completely absorbed by the material, material A is prepared and set aside.

[0092] (2) In a 10L internal mixer, based on the basic formula in Table 1, the filling coefficient of the internal mixer is 0.65, and the material density is calculated as 1.1g / ml. When the internal mixer temperature reaches 185℃, the prepared material A and 800.5g polypropylene F401 are added and plasticized for 0.5min. Then, 533.6g carbon black N347, 80g PEG4000, and 133.4g antioxidant 1076 are added. After premixing for 3 minutes, 800.4g CNF (200 mesh) is added to the internal mixer and mixed for another 4.5min to obtain masterbatch B. Masterbatch B is poured into the single-screw granulation hopper. The temperature of the single screw is set to 185℃. The single screw and pelletizer are started to complete the preparation of masterbatch C.

[0093] (3) Set the temperature of the vertical injection molding machine to 225℃. After the temperature stabilizes, use the prepared masterbatch C to complete the injection molding of the test sample. After the injection-molded sample is left to stand for 16 hours, the performance is characterized. The characterization results are shown in Table 1.

[0094] Example 2

[0095] The basic formula and process in Table 1 were followed, and the characterization results are shown in Table 1.

[0096] Example 3

[0097] The basic formula and process in Table 1 were followed, and the characterization results are shown in Table 1.

[0098] Example 4

[0099] The basic formula and process in Table 1 were followed, and the characterization results are shown in Table 1.

[0100] Example 5

[0101] The basic formula and process in Table 1 were followed, and the characterization results are shown in Table 1.

[0102] Comparative Example 1

[0103] The method of Example 1 was followed, except that Comparative Example 1 used unmodified SEBS. The characterization results are shown in Table 1.

[0104] Comparative Example 2

[0105] The method of Example 2 was followed, except that Comparative Example 2 did not introduce carbon black N347. The characterization results are shown in Table 1.

[0106] Table 1

[0107] S1 S2 S3 S4 S5 DS1 DS2 SEBS9901 100 100 90 80 85 --- 100 SEBS6151 --- --- 10 20 15 100 --- F401 30 --- 20 35 --- 30 --- 5090T --- 60 20 --- 45 --- 60 White oil 320 80 90 110 85 100 80 90 CNF(200 mesh) 30 30 22 20 10 30 42 CNF(1500 mesh) --- --- --- 15 20 --- --- CNT --- 8 3 5 6 --- 8 N347 20 12 25 10 14 20 --- PEG4000 3 5 2 5 4 3 5 Anti-aging agent 1076 5 4 6 3 4 5 4 Mixing temperature / °C 185 175 180 180 175 185 175 Mixing speed / rpm 80 80 80 80 80 80 80 First mixing time / min 3 3 1 1 2 3 3 Second mixing time / min 4.5 5 2.5 5 4.0 4.5 5 Single screw temperature / ℃ 185 175 180 180 175 185 175 Injection temperature / °C 225 215 210 220 210 225 215 Thermal conductivity (W / m·K) 0.786 0.882 0.728 0.927 0.770 0.383 0.715 Tensile strength / MPa 18.3 18.5 18.3 17.6 18.1 11.2 11.4

[0108] Based on the data in Table 1, it is evident that the thermoplastic composite material prepared using maleic anhydride-grafted SEBS, polypropylene, and white oil as the base materials exhibits high strength and good thermal conductivity. Comparative Examples 1-2 show that although carbon fiber is a carbon-based non-polar thermally conductive filler, its surface easily adsorbs polar molecules such as water. Therefore, when unmodified SEBS is used as the matrix, the filler's dispersion in the rubber-plastic matrix is ​​poor, resulting in unsatisfactory thermal conductivity and strength. Furthermore, since the thermally conductive filler is micron-sized, its reinforcing effect is poor. By introducing carbon-based reinforcing materials, the strength deficiency is compensated for. This invention cleverly designs the composite material composition, obtaining a thermoplastic composite material that combines high strength and high thermal conductivity, which can be applied to the preparation of pneumatic tire carcasses.

[0109] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A thermoplastic composite composition, characterized in that, The composition contains SBCs thermoplastic elastomer, polypropylene, filling oil, carbon-based heat-conducting filler, carbon-based reinforcing material and dispersant, wherein the SBCs thermoplastic elastomer contains maleic anhydride modified SEBS, The content of the filling oil is 50-120 parts by weight, the content of the polypropylene is 20-80 parts by weight, the content of the carbon-based heat-conducting filler is 10-60 parts by weight, the content of the carbon-based reinforcing material is 5-35 parts by weight, and the content of the dispersant is 1-10 parts by weight, relative to 100 parts by weight of the SBCs elastomer.

2. The composition of claim 1, wherein, The content of the filling oil is 80-100 parts by weight, the content of the polypropylene is 30-60 parts by weight, the content of the carbon-based heat-conducting filler is 20-40 parts by weight, the content of the carbon-based reinforcing material is 10-25 parts by weight, and the content of the dispersant is 2-5 parts by weight, relative to 100 parts by weight of the SBCs elastomer.

3. The composition of claim 1, wherein, The SBCs elastomer is maleic anhydride modified SEBS or maleic anhydride modified SEBS and SEBS.

4. The composition according to any one of claims 1-3, wherein, The SBCs elastomer contains 70% by weight or more of maleic anhydride modified SEBS, preferably 80-100% by weight of maleic anhydride modified SEBS.

5. The composition according to any one of claims 1-3, wherein, The carbon-based heat-conducting filler is one or more of carbon fiber, carbon nanotube, heat-conducting carbon black, graphite and carbonyl iron powder, preferably carbon fiber or carbon fiber and carbon nanotube.

6. The composition according to any one of claims 1-3, wherein, The filling oil is paraffin oil and / or naphthenic oil.

7. The composition according to any one of claims 1-3, wherein, The carbon-based reinforcing material is carbon black.

8. The composition according to any one of claims 1-3, wherein, The polypropylene is one or more of homopolymer polypropylene, copolymer polypropylene and modified polypropylene.

9. The composition according to any one of claims 1-3, wherein, The dispersant is polyethylene glycol.

10. The composition according to any one of claims 1-3, wherein, The composition further contains antioxidant, and the content of the antioxidant is 1-10 parts by weight, preferably 3-6 parts by weight, relative to 100 parts by weight of the SBCs elastomer.

11. A thermoplastic composite material, characterized by, The thermoplastic composite material is prepared using the thermoplastic composite material composition of any one of claims 1-10.

12. A method of preparing a thermoplastic composite material, characterized in that, The method uses the thermoplastic composite material composition of any one of claims 1-10 as raw material.

13. The method of claim 12, wherein, The preparation method of the thermoplastic composite material comprises: 1) a step of mixing SBCs thermoplastic elastomer and filling oil to obtain a master batch; 2) a step of first mixing the master batch, polypropylene, carbon-based reinforcing material and optional antioxidant, and then second mixing with carbon-based heat-conducting filler and dispersant to obtain a master rubber; 3) a step of extruding and granulating the master rubber.

14. The method of claim 13, wherein, The first mixing condition comprises a temperature of 160-190℃ and a time of 1-3min; Preferably, the second mixing condition comprises a temperature of 160-190℃ and a time of 2-5min.

15. Use of the thermoplastic composite material of claim 11 or the thermoplastic composite material prepared by the preparation method of any one of claims 12-14 in preparing airless tires.