An antibacterial TPV material for automobiles and its preparation method

Abstract

The present invention discloses an antibacterial TPV material for automobiles and a preparation method thereof. The raw materials for preparing the antibacterial TPV material include: ethylene propylene diene monomer rubber: 100 parts; polypropylene: 50 - 70 parts; filler: 40 - 60 parts; filling oil: 60 - 80 parts; antibacterial agent: 1 - 3 parts; vulcanizing agent: 2 - 4 parts; vulcanization accelerator: 1 - 2 parts; antioxidant: 0.5 - 1 part; ultraviolet absorber: 0.5 - 1 part. The present invention prepares a chitosan / nano zinc oxide / porous silicon dioxide composite material as an antibacterial agent, making ZnO evenly loaded on the skeleton of porous SiO2, effectively avoiding the agglomeration between nano ZnO particles, improving its dispersibility in the material, and using CS / ZnO / SiO2 as an antibacterial agent to prepare an automobile TPV material with good antibacterial performance. This material has good mechanical properties and antibacterial performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and particularly relates to an antibacterial TPV material for automobiles and a preparation method thereof. Background Art

[0002] With the development of technology and the gradual improvement of the quality of life, people pay more and more attention to their own health and safety, and they attach great importance to their own health protection work. Therefore, with the rapid development of the automotive industry and the increasing health requirements of consumers, the development of automotive materials with high antibacterial performance has become an industry trend.

[0003] Antibacterial agents are mainly divided into three categories. The first category is natural antibacterial agents such as chitosan, polypeptides, and essential oils extracted from animals and plants; the second category is organic antibacterial agents such as quaternary ammonium salts, guanidines, and halogenated phenols; the third category is inorganic antibacterial agents such as metals like Ag, Cu, and Hg, as well as non-metals and metal oxides like TiO2, ZnO, and CeO2. Among them, natural antibacterial agents have good biocompatibility, fast degradation, and almost no pollution, but their heat resistance and stability are poor; organic antibacterial agents have strong bactericidal power and a wide variety of types, but they have disadvantages such as high toxicity, the generation of microbial drug resistance, and poor heat resistance; while inorganic antibacterial agents have advantages such as broad-spectrum antibacterial, high temperature resistance, and strong persistence.

[0004] In patent CN107245187A, a mixture of polyhexamethylene monoguanidine hydrochloride and nano-silver is used as an antibacterial agent to prepare an antibacterial TPV composite material, which has a high cost, and silver ions can cause certain harm to the environment and the human body; in patent CN115536948A, nano-ZnO is used as an antibacterial agent to prepare an antibacterial TPV material. Nano-ZnO has a small size, poor dispersibility, and is prone to agglomeration. Agglomeration may occur during the preparation process of the TPV material, resulting in uneven distribution in the material and an insignificant antibacterial effect.

[0005] Therefore, in the preparation of automotive TPV materials, there is an urgent need for an antibacterial agent with excellent antibacterial performance, good heat resistance, low cost, safe and pollution-free, and good dispersibility, which will not agglomerate during the material processing. Summary of the Invention

[0006] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title. However, such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In view of the above and / or problems existing in the prior art, the present invention is proposed.

[0008] Therefore, the object of the present invention is to overcome the deficiencies in the prior art and provide an antibacterial TPV material for automobiles.

[0009] To solve the above technical problems, the present invention provides the following technical solutions: An antibacterial TPV material for automobiles, comprising the following components in parts by mass:

[0010] Ethylene propylene diene monomer rubber: 100 parts;

[0011] Polypropylene: 50 - 70 parts;

[0012] Filler: 40 - 60 parts;

[0013] Filling oil: 60 - 80 parts;

[0014] Antibacterial agent: 1 - 3 parts;

[0015] Vulcanizing agent: 2 - 4 parts;

[0016] Co - vulcanizing agent: 1 - 2 parts;

[0017] Antioxidant: 0.5 - 1 part;

[0018] Ultraviolet absorber: 0.5 - 1 part;

[0019] Among them, the antibacterial agent is a chitosan / nano - zinc oxide / porous silica composite material;

[0020] The filler is a composition of carbon black and wollastonite.

[0021] As a preferred embodiment of the antibacterial TPV material for automobiles of the present invention, wherein: The preparation method of the chitosan / nano - zinc oxide / porous silica composite material includes,

[0022] Weigh chitosan, add it to acetic acid aqueous solution to dissolve, then add zinc acetate dihydrate, after dissolution, stir at 70 °C for reaction, gradually add NaOH solution to adjust the pH of the reaction solution to 9 - 10 to promote the precipitation of ZnO, continue to stir the reaction solution to ensure the full formation of nano - ZnO particles;

[0023] Let it stand for precipitation, filter, wash the precipitate repeatedly with ethanol and deionized water until there is no residual liquid, and dry to obtain the chitosan - modified nano - zinc oxide CS / ZnO composite material;

[0024] Weigh porous SiO2, and prepare a 5% SiO2 suspension with deionized water;

[0025] Add the CS / ZnO composite material to the prepared SiO2 suspension, stir, then let it stand for precipitation, filter, wash, dry at 70 °C for 12 h, and then dry at 150 °C for 2 h to obtain the chitosan / nano - zinc oxide / porous silica composite material.

[0026] As a preferred embodiment of the antibacterial TPV material for automobiles of the present invention, wherein: the mass ratio of chitosan to zinc acetate dihydrate is 1:1, and the mass concentration of the acetic acid aqueous solution is 1%.

[0027] As a preferred embodiment of the antibacterial TPV material for automobiles of the present invention, wherein: the mass ratio of chitosan to porous SiO2 is 44:6, and the pore size of the porous SiO2 is 30 - 50 nm.

[0028] As a preferred embodiment of the antibacterial TPV material for automobiles of the present invention, wherein: the mass ratio of carbon black to wollastonite is 1:2.

[0029] As a preferred embodiment of the antibacterial TPV material for automobiles of the present invention, wherein: the third monomer in the ethylene - propylene - diene rubber is ethylidene norbornene, the proportion of the third monomer is 4.0 - 6.0%, and the Mooney viscosity is 60 - 70; the polypropylene is homopolypropylene, and the melt flow rate is 2.5 - 3.5 g / 10 min.

[0030] As a preferred embodiment of the antibacterial TPV material for automobiles of the present invention, wherein: the vulcanizing agent is a peroxide vulcanizing agent, including dicumyl peroxide DCP;

[0031] The co - vulcanizing agent is triallyl cyanurate TAC, triallyl isocyanurate TAIC, or a combination of one or both of them;

[0032] The filling oil is paraffin oil.

[0033] As a preferred embodiment of the antibacterial TPV material for automobiles of the present invention, wherein: the antioxidant is a hindered phenol antioxidant, including one or a combination of antioxidant 1076, antioxidant 264, and antioxidant 1010;

[0034] The ultraviolet absorber is a dihydroxybenzophenone type, including 2 - hydroxy - 4 - methoxy - benzophenone.

[0035] Another object of the present invention is to overcome the deficiencies in the prior art and provide a preparation method of an antibacterial TPV material for automobiles, including,

[0036] Adding ethylene - propylene - diene rubber, polypropylene, filler, filling oil, antibacterial agent, antioxidant, and ultraviolet absorber into a mixer and mixing evenly, then feeding it into a twin - screw extruder for extrusion granulation to obtain semi - finished product particles;

[0037] Mixing the obtained semi - finished product particles evenly with a vulcanizing agent and a co - vulcanizing agent, feeding them into a twin - screw extruder for mixing and vulcanizing, and extruding, cooling, and shaping to obtain the antibacterial TPV material for automobiles.

[0038] As a preferred embodiment of the preparation method of the antibacterial TPV material for automobiles according to the present invention, wherein: the operating temperature of the twin-screw extruder for preparing the semi-finished product particles is 150-180 °C, and the screw speed is 250-300 rpm;

[0039] It is fed into the twin-screw extruder for mixing and vulcanization. Among them, the operating temperature of the twin-screw extruder is 160-190 °C, and the screw speed is 200-250 rpm.

[0040] Advantages of the present invention:

[0041] (1) The present invention prepares a chitosan / nano-zinc oxide / porous silica (CS / ZnO / SiO2) composite material as an antibacterial agent, enabling the uniform compounding of nano-ZnO on the skeleton of porous SiO2, effectively avoiding the problem of the decline in antibacterial performance caused by the aggregation of nano-ZnO particles; in addition, the antibacterial performance of nano-ZnO is mainly based on the strongly oxidizing free radicals generated by photocatalysis, which can destroy important biomolecules in bacterial cells. The antibacterial performance of nano-ZnO weakens under dark conditions. After compounding with CS, it can make up for the decline in the antibacterial performance of the TPV material in the dark environment. After the compounding of nano-ZnO and CS, it can also play a synergistic role, increasing the antibacterial performance of the antibacterial material as a whole.

[0042] (2) Using CS / ZnO / SiO2 as an antibacterial agent, the prepared TPV material has good properties such as wear resistance, compression set resistance, and anti-aging performance, and can be widely used in various parts of automobiles where TPV materials are used, and has good antibacterial effects. Specific embodiments

[0043] To make the above objects, features, and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below in conjunction with the embodiments of the specification.

[0044] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0045] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation manner of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0046] In the embodiments of the present invention:

[0047] The ethylene-propylene-diene monomer rubber comes from Shanghai Sinopec Mitsui Elastomers Co., Ltd., with an ethylene content > 60%, the third monomer being ethylidene norbornene, the proportion of the third monomer being 4.0 - 6.0%, and the Mooney viscosity being 60 - 70;

[0048] The polypropylene comes from Changzhou Haihong Plastic Technology Co., Ltd., with a melt flow rate of 2.5 - 3.5 g / 10 min;

[0049] The filling oil comes from Shandong Jinli Chemical Co., Ltd.;

[0050] The chitosan comes from Jiangsu Dongju Biotechnology Co., Ltd.;

[0051] The porous SiO2 comes from Hangzhou Jikang New Materials Co., Ltd., with a particle size of 30 - 40 nm.

[0052] Example 1

[0053] This example is a preparation method of a chitosan / nano-zinc oxide / porous silica (CS / ZnO / SiO2) composite material. The main steps are as follows:

[0054] (1) Weigh 44 kg of chitosan, add it to 1000 kg of 1% acetic acid aqueous solution to dissolve, then add 44 kg of zinc acetate dihydrate. After dissolution, stir and react at 70°C, gradually add 1 moL / L NaOH solution to adjust the pH of the reaction solution to 10 to promote the precipitation of ZnO, and continue to stir the reaction solution for 4 h to ensure the full formation of ZnO particles;

[0055] Let it stand and precipitate for 24 h, filter, and repeatedly wash the precipitate with ethanol and deionized water until there is no residual liquid, and dry it at 70°C for 12 h to obtain the chitosan-modified nano-zinc oxide (CS / ZnO) composite material.

[0056] (2) Weigh 6 kg of porous SiO2 material with a pore size of 30 - 50 nm, and prepare a 5% SiO2 suspension with deionized water;

[0057] (3) Add the CS / ZnO composite material to the SiO2 suspension prepared in (2), stir for 12 h, then let it stand and precipitate for 24 h, filter, wash, dry at 70°C for 12 h, and then dry at 150°C for 2 h to obtain the chitosan / nano-zinc oxide / porous silica (CS / ZnO / SiO2) composite material.

[0058] Example 2

[0059] This example provides a preparation method of an antibacterial TPV material for automobiles, including the following components in parts by mass:

[0060] Ethylene-propylene-diene monomer rubber: 100 parts;

[0061] Polypropylene: 60 parts;

[0062] Filler: A composition of carbon black: wollastonite = 1:2, 50 parts;

[0063] Filling oil: Paraffin oil, 70 parts;

[0064] Antibacterial agent: 2 parts;

[0065] Vulcanizing agent: Dicumyl peroxide DCP, 3 parts;

[0066] Vulcanization accelerator: 1.5 parts;

[0067] Antioxidant: 0.8 part;

[0068] UV absorber: 2 - hydroxy - 4 - methoxy - benzophenone, 0.8 part.

[0069] Among them, the antibacterial agent is the CS / ZnO / SiO2 composite material prepared in Example 1, the vulcanization accelerator is triallyl cyanurate (TAC), and the antioxidant is antioxidant 1010.

[0070] Its preparation process is as follows:

[0071] S1: Add ethylene - propylene - diene monomer rubber, polypropylene, filler, filling oil, antibacterial agent, antioxidant, and UV absorber into a mixer and mix evenly, then send it into a twin - screw extruder for extrusion granulation to obtain semi - finished particles;

[0072] S2: Then mix the obtained semi - finished particles evenly with the vulcanizing agent and vulcanization accelerator, and then send them into a twin - screw extruder for mixing and vulcanization, and extrude and cool for shaping to obtain the antibacterial TPV material for automobiles.

[0073] Among them, the temperatures of each zone of the twin - screw extruder in step S1 are respectively: 150 °C, 160 °C, 170 °C, 175 °C, 180 °C, 180 °C, 170 °C, and the screw speed is 280 rpm;

[0074] The temperatures of each zone of the twin - screw extruder in step S2 are respectively: 160 °C, 170 °C, 180 °C, 185 °C, 190 °C, 190 °C, 180 °C, and the screw speed is 220 rpm.

[0075] Example 3

[0076] An antibacterial TPV material for automobiles and its preparation method, including the following components in parts by mass:

[0077] Ethylene - propylene - diene monomer rubber: 100 parts;

[0078] Polypropylene: 70 parts;

[0079] Filler: A composition of carbon black: wollastonite = 1:2, 60 parts;

[0080] Filling oil: paraffin oil, 80 parts;

[0081] Antibacterial agent: 3 parts;

[0082] Vulcanizing agent: dicumyl peroxide DCP, 4 parts;

[0083] Vulcanization aid: 2 parts;

[0084] Antioxidant: 1 part;

[0085] UV absorber: 2-hydroxy-4-methoxy-benzophenone, 1 part.

[0086] The antibacterial agent is the CS / ZnO / SiO2 composite material prepared in Example 1, the vulcanization aid is triallyl cyanurate (TAC), and the antioxidant is antioxidant 1010.

[0087] Its preparation process is as follows:

[0088] S1: Add ethylene propylene diene monomer rubber, polypropylene, filler, filling oil, antibacterial agent, antioxidant, and UV absorber into a mixer and mix evenly, then send it into a twin-screw extruder for extrusion granulation to obtain semi-finished particles;

[0089] S2: Then mix the obtained semi-finished particles with the vulcanizing agent and vulcanization aid evenly, and then send them into a twin-screw extruder for mixing and vulcanization, and extrude and cool and shape to obtain the antibacterial TPV material for automobiles.

[0090] Among them, the temperatures of each zone of the twin-screw extruder in step S1 are: 150 °C, 160 °C, 170 °C, 175 °C, 180 °C, 180 °C, 170 °C, and the screw speed is 300 rpm;

[0091] The temperatures of each zone of the twin-screw extruder in step S2 are: 160 °C, 170 °C, 180 °C, 185 °C, 190 °C, 190 °C, 180 °C, and the screw speed is 250 rpm.

[0092] Example 4

[0093] An antibacterial TPV material for automobiles and its preparation method, including the following components in parts by mass:

[0094] Ethylene propylene diene monomer rubber: 100 parts;

[0095] Polypropylene: 50 parts;

[0096] Filler: a composition of carbon black: wollastonite = 1:2, 40 parts;

[0097] Filling oil: paraffin oil, 60 parts;

[0098] Antibacterial agent: 1 part;

[0099] Vulcanizing agent: dicumyl peroxide (DCP), 2 parts;

[0100] Co-vulcanizing agent: 1 part;

[0101] Antioxidant: 0.5 part;

[0102] UV absorber: 2-hydroxy-4-methoxy-benzophenone, 0.5 part.

[0103] Among them, the antibacterial agent is the CS / ZnO / SiO2 composite material prepared in Example 1, the co-vulcanizing agent is triallyl isocyanurate (TAIC), and the antioxidant is antioxidant 1010.

[0104] The preparation process is as follows:

[0105] S1: Add ethylene propylene diene monomer rubber, polypropylene, filler, filling oil, antibacterial agent, antioxidant, and UV absorber into a mixer and mix evenly, then send it to a twin-screw extruder for extrusion granulation to obtain semi-finished particles;

[0106] S2: Then mix the obtained semi-finished particles with the vulcanizing agent and co-vulcanizing agent evenly, and then send them to a twin-screw extruder for mixing and vulcanization, and extrude and cool and shape to obtain antibacterial TPV material for automobiles.

[0107] Among them, the temperatures of each zone of the twin-screw extruder in step S1 are: 150 °C, 160 °C, 170 °C, 175 °C, 180 °C, 180 °C, 170 °C, and the screw speed is 250 rpm;

[0108] The temperatures of each zone of the twin-screw extruder in step S2 are: 160 °C, 170 °C, 180 °C, 185 °C, 190 °C, 190 °C, 180 °C, and the screw speed is 200 rpm.

[0109] Example 5

[0110] An antibacterial TPV material for automobiles and its preparation method, including the following components in parts by mass:

[0111] Ethylene propylene diene monomer rubber: 100 parts;

[0112] Polypropylene: 60 parts;

[0113] Filler: a composition of carbon black: wollastonite = 1:2, 40 parts;

[0114] Filling oil: paraffin oil, 80 parts;

[0115] Antibacterial agent: 2 parts;

[0116] Vulcanizing agent: dicumyl peroxide (DCP), 2 parts;

[0117] Co-vulcanizing agent: 1 part;

[0118] Antioxidant: 1 part;

[0119] Ultraviolet absorber: 2 - hydroxy - 4 - methoxy - benzophenone, 1 part.

[0120] Among them, the antibacterial agent is the CS / ZnO / SiO2 composite material prepared in Example 1, the co - vulcanizing agent is triallyl cyanurate (TAC), and the antioxidant is antioxidant 1076.

[0121] Its preparation process is as follows:

[0122] S1: Add ethylene - propylene - diene monomer rubber, polypropylene, filler, filling oil, antibacterial agent, antioxidant, and ultraviolet absorber into a mixer and mix evenly, then send it into a twin - screw extruder for extrusion granulation to obtain semi - finished product particles;

[0123] S2: Then mix the obtained semi - finished product particles with vulcanizing agent and co - vulcanizing agent evenly, and then send them into a twin - screw extruder for mixing and vulcanization, and extrude and cool for shaping to obtain antibacterial TPV material for automobiles.

[0124] Among them, the temperatures of each zone of the twin - screw extruder in step S1 are respectively: 150 °C, 160 °C, 170 °C, 175 °C, 180 °C, 180 °C, 170 °C, and the screw speed is 280 rpm;

[0125] The temperatures of each zone of the twin - screw extruder in step S2 are respectively: 160 °C, 170 °C, 180 °C, 185 °C, 190 °C, 190 °C, 180 °C, and the screw speed is 220 rpm.

[0126] Example 6

[0127] An antibacterial TPV material for automobiles and its preparation method, including the following components in parts by mass:

[0128] Ethylene - propylene - diene monomer rubber: 100 parts;

[0129] Polypropylene: 60 parts;

[0130] Filler: A composition of carbon black: wollastonite = 1:2, 60 parts;

[0131] Filling oil: Paraffin oil, 60 parts;

[0132] Antibacterial agent: 3 parts;

[0133] Vulcanizing agent: Dicumyl peroxide (DCP), 3 parts;

[0134] Co - vulcanizing agent: 2 parts;

[0135] Antioxidant: 0.5 part;

[0136] UV absorber: 2-hydroxy-4-methoxybenzophenone, 0.5 part.

[0137] The antibacterial agent is the CS / ZnO / SiO2 composite material prepared in Example 1, the co-vulcanizing agent is triallyl isocyanurate (TAIC), and the antioxidant is a composition of antioxidant 1010 and antioxidant 1076, and their mass ratio is 1:1.

[0138] The preparation process is as follows:

[0139] S1: Add ethylene propylene diene monomer rubber, polypropylene, filler, filling oil, antibacterial agent, antioxidant, and UV absorber into a mixer and mix evenly, then send it to a twin-screw extruder for extrusion granulation to obtain semi-finished particles;

[0140] S2: Then mix the obtained semi-finished particles with vulcanizing agent and co-vulcanizing agent evenly, and then send them to a twin-screw extruder for mixing and vulcanization, and extrude and cool and shape to obtain antibacterial TPV material for automobiles.

[0141] Among them, the temperatures of each zone of the twin-screw extruder in step S1 are: 150 °C, 160 °C, 170 °C, 175 °C, 180 °C, 180 °C, 170 °C, and the screw speed is 270 rpm;

[0142] The temperatures of each zone of the twin-screw extruder in step S2 are: 160 °C, 170 °C, 180 °C, 185 °C, 190 °C, 190 °C, 180 °C, and the screw speed is 230 rpm.

[0143] Example 7

[0144] An antibacterial TPV material for automobiles and its preparation method, including the following components in parts by mass:

[0145] Ethylene propylene diene monomer rubber: 100 parts;

[0146] Polypropylene: 50 parts;

[0147] Filler: a composition of carbon black: wollastonite = 1:2, 40 parts;

[0148] Filling oil: paraffin oil, 60 parts;

[0149] Antibacterial agent: 1 part;

[0150] Vulcanizing agent: dicumyl peroxide DCP, 4;

[0151] Co-vulcanizing agent: 2 parts;

[0152] Antioxidant: 1 part;

[0153] UV absorber: 2-hydroxy-4-methoxybenzophenone, 0.5 part.

[0154] Among them, the antibacterial agent is the CS / ZnO / SiO2 composite material prepared in Example 1, the co-vulcanizing agent is triallyl cyanurate (TAC), and the antioxidant is antioxidant 264.

[0155] The preparation process is as follows:

[0156] S1: Add ethylene propylene diene monomer rubber, polypropylene, filler, filling oil, antibacterial agent, antioxidant, and ultraviolet light absorber into a mixer and mix evenly, then send it into a twin-screw extruder for extrusion granulation to obtain semi-finished particles;

[0157] S2: Then mix the obtained semi-finished particles evenly with the vulcanizing agent and co-vulcanizing agent, and then send them into a twin-screw extruder for mixing and vulcanization, and extrude and cool and shape to obtain antibacterial TPV material for automobiles.

[0158] Among them, the temperatures of each zone of the twin-screw extruder in step S1 are: 150 °C, 160 °C, 170 °C, 175 °C, 180 °C, 180 °C, 170 °C, and the screw speed is 290 rpm;

[0159] The temperatures of each zone of the twin-screw extruder in step S2 are: 160 °C, 170 °C, 180 °C, 185 °C, 190 °C, 190 °C, 180 °C, and the screw speed is 240 rpm.

[0160] Example 8

[0161] An antibacterial TPV material for automobiles and its preparation method, comprising the following components in parts by mass:

[0162] Ethylene propylene diene monomer rubber: 100 parts;

[0163] Polypropylene: 50 parts;

[0164] Filler: a composition of carbon black: wollastonite = 1:2, 60 parts;

[0165] Filling oil: paraffin oil, 80 parts;

[0166] Antibacterial agent: 3 parts;

[0167] Vulcanizing agent: dicumyl peroxide DCP, 2 parts;

[0168] Co-vulcanizing agent: 1 part;

[0169] Antioxidant: 0.5 part;

[0170] Ultraviolet light absorber: 2-hydroxy-4-methoxy-benzophenone, 1 part.

[0171] Among them, the antibacterial agent is the CS / ZnO / SiO2 composite material prepared in Example 1, the co-vulcanizing agent is a composition of triallyl cyanurate (TAC) and triallyl isocyanurate (TAIC), and their mass ratio is 1:1. The antioxidant is a composition of antioxidant 264 and antioxidant 1010, and their mass ratio is 1:1.

[0172] The preparation process is as follows:

[0173] S1: Add ethylene propylene diene monomer rubber, polypropylene, filler, filling oil, antibacterial agent, antioxidant, and ultraviolet absorber into a mixer and mix evenly, and then send it to a twin-screw extruder for extrusion granulation to obtain semi-finished particles;

[0174] S2: Then mix the obtained semi-finished particles with vulcanizing agent and co-vulcanizing agent evenly, and then send it to a twin-screw extruder for mixing and vulcanization, and extrude and cool and shape to obtain antibacterial TPV material for automobiles.

[0175] Among them, the temperatures of each zone of the twin-screw extruder in step S1 are: 150 °C, 160 °C, 170 °C, 175 °C, 180 °C, 180 °C, 170 °C, and the screw speed is 300 rpm;

[0176] The temperatures of each zone of the twin-screw extruder in step S2 are: 160 °C, 170 °C, 180 °C, 185 °C, 190 °C, 190 °C, 180 °C, and the screw speed is 210 rpm.

[0177] Comparative Example 1

[0178] The component ratios of Comparative Example 1 are the same as those of Example 2, and the difference is that the antibacterial agent used is nano-ZnO. The preparation process of Comparative Example 1 is the same as that of Example 2.

[0179] Comparative Example 2

[0180] The component ratios of Comparative Example 2 are the same as those of Example 2, and the difference is that the antibacterial agent used is chitosan. The preparation process of Comparative Example 2 is the same as that of Example 2.

[0181] Comparative Example 3

[0182] The component ratios of Comparative Example 3 are the same as those of Example 2, and the difference is that no antibacterial agent is added. The preparation process of Comparative Example 3 is the same as that of Example 2.

[0183] Comparative Example 4

[0184] The component ratios of Comparative Example 4 are the same as those of Example 2, and the difference is that the filler used is carbon black. The preparation process of Comparative Example 4 is the same as that of Example 2.

[0185] Comparative Example 5

[0186] The proportion of each component in Comparative Example 5 was the same as that in Example 2, except that the filler used was wollastonite. The preparation process of Comparative Example 5 was the same as that of Example 2.

[0187] Testing method:

[0188] The materials prepared in Examples 2-8 and Comparative Examples 1-5 were subjected to performance testing, and the testing methods for each performance were as follows:

[0189] (1) Shore hardness measurement method: Measured according to GB / T531.1-2008.

[0190] (2) Tensile strength measurement method: Measured according to GB / T528-2009.

[0191] (3) Elongation at break measurement method: Measured according to GB / T528-2009.

[0192] (4) Compression set measurement method: Measured according to GB / T7759.1-2015.

[0193] (5) Antibacterial performance measurement: Measured according to QB / T2591-2003.

[0194] Test results:

[0195] Table 1 Performance test results of examples and comparative examples

[0196]

[0197] As can be seen from Table 1, the TPV materials prepared in Examples 2-8 have excellent antibacterial performance, and the antibacterial rates against Escherichia coli and Staphylococcus aureus are both > 90%.

[0198] In contrast, in Comparative Examples 1-2, when using nano-ZnO or chitosan alone as the antibacterial agent, due to the agglomeration effect or poor heat resistance, the antibacterial effect is poor.

[0199] The TPV material prepared without adding an antibacterial agent in Comparative Example 3 does not have antibacterial effect. As can be seen from Comparative Examples 4-5, when using carbon black-wollastonite composite filler as the filler compared with using a single substance as the filler, the mechanical properties of the prepared TPV material are better, and the carbon black-wollastonite composite has a synergistic effect on providing mechanical properties.

[0200] In summary, the present invention provides an antibacterial TPV material for automobiles and its preparation method, and prepares a TPV material for automobiles with good mechanical properties and antibacterial properties, which can fully meet the use requirements on automobiles.

[0201] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the present invention.

Claims

1. An antibacterial TPV material for automobiles, characterized in that: Comprising the following components in parts by mass: Ethylene propylene diene monomer (EPDM): 100 parts; Polypropylene: 50 - 70 parts; Filler: 40 - 60 parts; Filling oil: 60 - 80 parts; Antibacterial agent: 1 - 3 parts; Vulcanizing agent: 2 - 4 parts; Vulcanization accelerator: 1 - 2 parts; Antioxidant: 0.5 - 1 part; UV absorber: 0.5 - 1 part; Wherein, the antibacterial agent is a chitosan / nano-zinc oxide / porous silica composite material, and the preparation method of the chitosan / nano-zinc oxide / porous silica composite material includes, Weigh chitosan, add it to acetic acid aqueous solution to dissolve, then add zinc acetate dihydrate, after dissolution, stir at 70 °C for reaction, gradually add NaOH solution to adjust the pH of the reaction solution to 9 - 10 to promote ZnO precipitation, continue to stir the reaction solution to ensure the full formation of nano-ZnO particles; Let it stand for precipitation, filter, wash the precipitate repeatedly with ethanol and deionized water until there is no residual liquid, and dry to obtain chitosan-modified nano-zinc oxide CS / ZnO composite material; Weigh porous SiO2, and prepare a 5% SiO2 suspension with deionized water; Add the CS / ZnO composite material to the prepared SiO2 suspension, stir, then let it stand for precipitation, filter, wash, dry at 70 °C for 12 h, and then dry at 150 °C for 2 h to obtain chitosan / nano-zinc oxide / porous silica composite material; The filler is a composition of carbon black and wollastonite, and the mass ratio of carbon black to wollastonite is 1:

2.

2. The antibacterial TPV material for automobiles according to claim 1, characterized in that: The mass ratio of chitosan to zinc acetate dihydrate is 1:1, and the mass concentration of acetic acid aqueous solution is 1%.

3. The antibacterial TPV material for automobiles according to claim 1 or 2, characterized in that: The mass ratio of chitosan to porous SiO2 is 44:6, and the pore size of the porous SiO2 is 30 - 50 nm.

4. The antibacterial TPV material for automobiles according to claim 1, characterized in that: The third monomer in the ethylene propylene diene monomer (EPDM) is ethylidene norbornene, the proportion of the third monomer is 4.0 - 6.0%, and the Mooney viscosity is 60 - 70; the polypropylene is homopolypropylene, and the melt flow rate is 2.5 - 3.5 g / 10 min.

5. The antibacterial TPV material for automobiles according to claim 4, characterized in that: The vulcanizing agent is a peroxide vulcanizing agent, including dicumyl peroxide (DCP); The vulcanization accelerator is a composition of triallyl cyanurate (TAC), triallyl isocyanurate (TAIC) or both; The filling oil is paraffin oil.

6. The antibacterial TPV material for automobiles according to claim 5, wherein: The antioxidant is a hindered phenol antioxidant, including one or more compositions of antioxidant 1076, antioxidant 264, antioxidant 1010; The UV absorber is a dihydroxybenzophenone type, including 2-hydroxy-4-methoxy-benzophenone.

7. The preparation method of the antibacterial TPV material for automobiles according to any one of claims 1 to 6, characterized in that: Including, Add ethylene propylene diene monomer (EPDM), polypropylene, filler, filling oil, antibacterial agent, antioxidant, and UV absorber into a mixer and mix evenly, then send it into a twin-screw extruder for extrusion granulation to obtain semi-finished particles; Mix the obtained semi-finished particles evenly with the vulcanizing agent and vulcanization accelerator, send them into a twin-screw extruder for mixing and vulcanization, extrude and cool for shaping to obtain antibacterial TPV material for automobiles.

8. The preparation method according to claim 7, characterized in that: The operating temperature of the twin-screw extruder for preparing semi-finished particles is 150 - 180 °C, and the screw speed is 250 - 300 rpm; Send it into the twin-screw extruder for mixing and vulcanization, wherein, the operating temperature of the twin-screw extruder is 160 - 190 °C, and the screw speed is 200 - 250 rpm.

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