阅读说明：本技术 汽车内饰用抗菌软触感聚烯烃复合材料及其制备方法 (Antibacterial soft touch polyolefin composite material for automotive interior and preparation method thereof ) 是由 李志海 刘双仕 韦绍珍 黄国华 武海刚 陈龙 莫兰 韦家德 韦天龙 莫柳亮 于 2021-01-20 设计创作，主要内容包括：本发明公开一种汽车内饰用抗菌软触感聚烯烃复合材料及其制备方法。其采用的原料有：再生TPO蒙皮材料、玻璃纤维、高结晶均聚聚丙烯、线型低密度聚乙烯、滑石粉、耐候剂、纳米银离子抗菌剂、相容剂、抗氧剂、着色剂；其包括将再生TPO蒙皮材料及高结晶均聚聚丙烯、线型低密度聚乙烯混合搅拌,接着加入滑石粉、耐候剂、纳米银离子抗菌剂、相容剂、抗氧剂、着色剂继续混合搅拌,然后放入双螺杆挤出机中,并在挤出过程加入玻璃纤维、冷却、干燥、切粒。本发明通过对再生TPO蒙皮材料进行改性,使其满足汽车内饰用抗菌软触感聚烯烃复合材料生产用原料的要求,不仅可以缓解上述资源浪费和环境污染等问题,还可以有效降低原材料成本,提高企业的经济效益。(The invention discloses an antibacterial soft touch polyolefin composite material for automotive interior and a preparation method thereof. The raw materials adopted by the method are as follows: regenerated TPO skin material, glass fiber, high-crystalline homo-polypropylene, linear low-density polyethylene, talcum powder, weather-resistant agent, nano silver ion antibacterial agent, compatilizer, antioxidant and colorant; mixing and stirring a regenerated TPO skin material, high-crystallization homo-polypropylene and linear low-density polyethylene, adding talcum powder, a weather-resistant agent, a nano silver ion antibacterial agent, a compatilizer, an antioxidant and a coloring agent, continuously mixing and stirring, then putting into a double-screw extruder, adding glass fiber in the extrusion process, cooling, drying and granulating. According to the invention, the regenerated TPO skin material is modified, so that the requirements of the raw material for producing the antibacterial soft touch polyolefin composite material for automobile interior decoration are met, the problems of resource waste, environmental pollution and the like can be relieved, the raw material cost can be effectively reduced, and the economic benefit of enterprises is improved.)

1. An antibacterial soft touch polyolefin composite material for automotive interiors is characterized by being prepared from the following raw materials in percentage by weight:

35 to 60.5 percent of regenerated TPO skin material;

16.5 to 25 percent of glass fiber;

10 to 20 percent of high-crystallization homo-polypropylene;

5 to 8 percent of linear low-density polyethylene;

5 to 10 percent of talcum powder;

0.2 to 0.5 percent of weather resistant agent;

1-2% of nano silver ion antibacterial agent;

1 to 3 percent of compatilizer;

0.3 to 1.5 percent of antioxidant;

0.2 to 2 percent of colorant.

2. The antibacterial soft-touch polyolefin composite material for automotive interiors according to claim 1, characterized by comprising the following raw materials in percentage by weight:

50.2% of regenerated TPO skin material; 20% of glass fiber; 15.9 percent of high-crystalline homo-polypropylene; 5% of linear low-density polyethylene; 5% of talcum powder; 0.3 percent of weather resistant agent; 1% of nano silver ion antibacterial agent; 2% of a compatilizer; 0.3 percent of antioxidant; 0.3 percent of colorant.

3. The antibacterial soft-touch polyolefin composite for automotive interior according to claim 1 or 2, characterized in that:

the regenerated TPO skin material is prepared by sorting, crushing, separating, cleaning, defoaming, reacting, extruding and granulating the automotive interior foaming TPO skin material.

4. The antibacterial soft touch polyolefin composite for automotive interior according to claim 3, characterized in that:

the particle size of the nano silver ion antibacterial agent is 10 nm-30 nm;

the glass fiber is E alkali untwisted direct roving with the diameter of 14 microns processed by a coupling agent;

the high-crystallization homopolymerized polypropylene is polypropylene with a melt index of 10g/10 min-30 g/10min (230 ℃, 2.16 kg), a flexural modulus of 1500 MPa-1800 MPa and an isotacticity of more than or equal to 98 percent;

the linear low density polyethylene has a melt index of 16 g/10min (230 ℃, 2.16 kg);

the particle size of the talcum powder is 2-5 mu m, and the content of silicon dioxide is more than or equal to 57 percent;

the weather-resistant agent is prepared by compounding hindered amine hindered benzoate or compounding low molecular hindered amine and high molecular hindered amine;

the compatilizer is one or more of polyethylene grafted maleic anhydride, polypropylene grafted maleic anhydride and polypropylene grafted glycidyl methacrylate;

the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 in proportion;

the colorant is one of titanium dioxide, carbon black, phthalocyanine blue, ultramarine, iron red, permanent yellow and phthalocyanine green.

5. A preparation method of an antibacterial soft touch polyolefin composite material for automotive interiors is characterized by comprising the following steps:

the raw materials with the following weight percentages are adopted:

35 to 60.5 percent of regenerated TPO skin material;

16.5 to 25 percent of glass fiber;

10 to 20 percent of high-crystallization homo-polypropylene;

5 to 8 percent of linear low-density polyethylene;

5 to 10 percent of talcum powder;

0.2 to 0.5 percent of weather resistant agent;

1-2% of nano silver ion antibacterial agent;

1 to 3 percent of compatilizer;

0.3 to 1.5 percent of antioxidant;

0.2 to 2 percent of colorant;

the preparation method comprises the following steps:

A. pouring the regenerated TPO skin material, the high-crystalline homo-polypropylene and the linear low-density polyethylene into a heatable high-speed mixer according to the proportion, and mixing and stirring at high speed at the temperature of 50-60 ℃;

B. then pouring the talcum powder, the weather resisting agent, the nano silver ion antibacterial agent, the compatilizer, the antioxidant and the colorant into the high-speed mixer according to the mixture ratio, and continuously mixing and stirring at high speed to obtain a mixture;

C. and then, putting the mixture into a double-screw extruder for extrusion, adding glass fiber in the extrusion process, cooling, drying and granulating.

6. The preparation method of the antibacterial soft-touch polyolefin composite material for automotive interiors according to claim 5, wherein the weight percentages of the raw materials are as follows:

50.2% of regenerated TPO skin material; 20% of glass fiber; 15.9 percent of high-crystalline homo-polypropylene; 5% of linear low-density polyethylene; 5% of talcum powder; 0.3 percent of weather resistant agent; 1% of nano silver ion antibacterial agent; 2% of a compatilizer; 0.3 percent of antioxidant; 0.3 percent of colorant.

7. The method for preparing the antibacterial soft touch polyolefin composite for automotive interiors according to claim 5 or 6, characterized in that:

the regenerated TPO skin material is prepared by sorting, crushing, separating, cleaning, defoaming, reacting, extruding and granulating the automotive interior foaming TPO skin material.

8. The method for preparing an antibacterial soft touch polyolefin composite material for automotive interiors according to claim 7, characterized by:

the particle size of the nano silver ion antibacterial agent is 10 nm-30 nm;

the glass fiber is E alkali untwisted direct roving with the diameter of 14 microns processed by a coupling agent;

the high-crystallization homopolymerized polypropylene is polypropylene with a melt index of 10g/10 min-30 g/10min (230 ℃, 2.16 kg), a flexural modulus of 1500 MPa-1800 MPa and an isotacticity of more than or equal to 98 percent;

the linear low density polyethylene has a melt index of 16 g/10min (230 ℃, 2.16 kg);

the particle size of the talcum powder is 2-5 mu m, and the content of silicon dioxide is more than or equal to 57 percent;

the weather-resistant agent is prepared by compounding hindered amine hindered benzoate or compounding low molecular hindered amine and high molecular hindered amine;

the compatilizer is one or more of polyethylene grafted maleic anhydride, polypropylene grafted maleic anhydride and polypropylene grafted glycidyl methacrylate;

the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 in proportion;

the colorant is one of titanium dioxide, carbon black, phthalocyanine blue, ultramarine, iron red, permanent yellow and phthalocyanine green.

Technical Field

The invention relates to the technical field of automobile part manufacturing, in particular to an automobile interior material and a preparation method thereof.

Background

With the increasing demand of people on the comfort of the automotive interior, the application of soft touch materials in the door panels and instrument panels of the automotive interior is gradually increased, the conventional soft touch is usually realized by coating soft skins, and the soft touch composite material which can be directly injection molded becomes the development direction of the automotive interior. Meanwhile, people are healthy and environment-friendly, the interior parts are most frequently contacted by drivers, and the antibacterial property of the interior material meets the aim of blocking bacteria from staying and spreading.

TPO skin material is used for that cladding piece material utilization ratio is lower, leftover bits are more, and this material is worth highly just compliance and elasticity are good, if directly abandon will cause the very big waste and the environmental pollution of resource. However, these TPO skin materials (i.e., TPO polyolefin thermoplastic elastomers) have properties such as soft touch and elasticity, but have disadvantages such as large molding shrinkage, low flexural modulus of elasticity, poor flowability, relatively difficult injection molding, insufficient weather resistance, and poor strength, rigidity, and heat resistance, and therefore, they are only used for interior coating skin, and the scrap produced therefrom cannot be directly used for automotive interior structural members such as door panels and instrument panels, which severely limits the application of the regenerated TPO skin materials in automotive interiors.

Disclosure of Invention

The invention provides an antibacterial soft touch polyolefin composite material for automotive interiors and a preparation method thereof.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the material is prepared from the following raw materials in percentage by weight:

35 to 60.5 percent of regenerated TPO skin material;

16.5 to 25 percent of glass fiber;

10 to 20 percent of high-crystallization homo-polypropylene;

5 to 8 percent of linear low-density polyethylene;

5 to 10 percent of talcum powder;

0.2 to 0.5 percent of weather resistant agent;

1-2% of nano silver ion antibacterial agent;

1 to 3 percent of compatilizer;

0.3 to 1.5 percent of antioxidant;

0.2 to 2 percent of colorant;

the preparation method comprises the following steps:

A. pouring the regenerated TPO skin material, the high-crystalline homo-polypropylene and the linear low-density polyethylene into a heatable high-speed mixer according to the proportion, and mixing and stirring at high speed at the temperature of 50-60 ℃;

B. then pouring the talcum powder, the weather resisting agent, the nano silver ion antibacterial agent, the compatilizer, the antioxidant and the colorant into the high-speed mixer according to the mixture ratio, and continuously mixing and stirring at high speed to obtain a mixture;

C. and then, putting the mixture into a double-screw extruder for extrusion, adding glass fiber in the extrusion process, cooling, drying and granulating.

In the above technical solution, a more specific technical solution may also be: the weight percentage of each raw material is as follows:

50.2% of regenerated TPO skin material; 20% of glass fiber; 15.9 percent of high-crystalline homo-polypropylene; 5% of linear low-density polyethylene; 5% of talcum powder; 0.3 percent of weather resistant agent; 1% of nano silver ion antibacterial agent; 2% of a compatilizer; 0.3 percent of antioxidant; 0.3 percent of colorant.

Furthermore, the regenerated TPO skin material is prepared by sorting, crushing, separating, cleaning, defoaming, reacting, extruding and granulating the automotive interior foaming TPO skin material.

Further, the particle size of the nano silver ion antibacterial agent is 10 nm-30 nm;

the glass fiber is E alkali untwisted direct roving with the diameter of 14 microns processed by a coupling agent;

the high-crystallization homopolymerized polypropylene is polypropylene with a melt index of 10g/10 min-30 g/10min (230 ℃, 2.16 kg), a flexural modulus of 1500 MPa-1800 MPa and an isotacticity of more than or equal to 98 percent;

the linear low density polyethylene has a melt index of 16 g/10min (230 ℃, 2.16 kg);

the particle size of the talcum powder is 2-5 mu m, and the content of silicon dioxide is more than or equal to 57 percent;

the weather-resistant agent is prepared by compounding hindered amine hindered benzoate or compounding low molecular hindered amine and high molecular hindered amine;

the compatilizer is one or more of polyethylene grafted maleic anhydride, polypropylene grafted maleic anhydride and polypropylene grafted glycidyl methacrylate;

the antioxidant is prepared from a hindered phenol antioxidant and a phosphite ester antioxidant in a mass ratio of 3: 1 in proportion;

the colorant is one of titanium dioxide, carbon black, phthalocyanine blue, ultramarine, iron red, permanent yellow and phthalocyanine green.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, by using the softness and elasticity of the regenerated TPO skin material, the rigidity of the material is improved through the reinforcement of the glass fiber, and the molding shrinkage rate is reduced; the material flow property is improved by the composite modification of high-crystallization homopolymerized polypropylene and linear low-density polyethylene; the antibacterial performance of the material is realized through the silver ion antibacterial agent, and the antibacterial rate of staphylococcus aureus and escherichia coli reaches 99%, so that the regenerated TPO skin material meets the requirements of raw materials for producing the antibacterial soft-touch polyolefin composite material for automotive interiors, the problems of resource waste, environmental pollution and the like can be relieved, the raw material cost can be effectively reduced, and the economic benefit of enterprises is improved.

2. Compared with other copolymerized PP, the invention selects high-crystallization homopolymerized polypropylene, particularly limits the polypropylene with the melt index of 10g/10 min-30 g/10min (230 ℃, 2.16 kg), the bending modulus of 1500 MPa-1800 MPa and the isotacticity of more than or equal to 98 percent, and has the advantages of strong rigidity, high heat deformation temperature, excellent scratch resistance, high fluidity and good processing performance.

3. Compared with other compatilizers, the polyethylene grafted maleic anhydride, the polypropylene grafted maleic anhydride and the polypropylene grafted glycidyl methacrylate selected by the invention can greatly improve the comprehensive performance of the whole formula system, reduce the resistance of contact interfaces of different polymers, reduce the particle size of a disperse phase, increase the surface area of the disperse phase, improve the binding force of the disperse phase and a continuous phase and form a stable whole between all phases in the system.

4. Compared with other antioxidants, the mass ratio of the hindered phenol antioxidant to the phosphite antioxidant is 3: 1, the two components have a synergistic effect, so that the thermal-oxidative aging resistance of the material is improved, and the cost is properly reduced; the low molecular hindered amine and the high molecular hindered amine are selected for compounding, and the high-temperature-resistant and thermal-oxidative-aging-resistant heat-oxidative-aging-.

5. Compared with other fillers, the invention selects the talcum powder with the grain diameter of 2-5 mu m and the silicon dioxide content of more than or equal to 57 percent, and has the advantages of good dispersion performance, material strength improvement and material impact performance guarantee.

Detailed Description

The present invention is further described in detail below with reference to examples;

the following table 1 shows compositions of examples 1 to 3, table 3 shows compositions of comparative examples 1 to 3 in terms of weight percentage of raw materials, table 2 shows data of performance tests of products obtained in examples 1 to 3, and table 4 shows data of performance tests of products obtained in comparative examples 1 to 3.

Wherein, in tables 1 and 3, the related regenerated TPO skin materials are prepared by sorting, crushing, separating, cleaning, defoaming, reacting, extruding and granulating the automotive interior foaming TPO skin materials;

the particle size of the related nano silver ion antibacterial agent is 10 nm-30 nm;

the involved glass fibers are E alkali untwisted direct roving with the diameter of 14 microns processed by a coupling agent;

the related high-crystallization homopolymerization polypropylene is polypropylene with a melt index of 10g/10 min-30 g/10min (230 ℃, 2.16 kg), a flexural modulus of 1500 MPa-1800 MPa and an isotacticity of more than or equal to 98 percent;

the related linear low density polyethylene has a melt index of 16 g/10min (230 ℃, 2.16 kg);

the particle size of the related talcum powder is 2-5 mu m, and the content of silicon dioxide is more than or equal to 57 percent;

the weather resisting agent comprises the following components: the preparation method is characterized in that the preparation method is that the preparation method of the preparation method is that the preparation method is used in the embodiment 1 and the comparative example 1 and is prepared by compounding hindered amine hindered benzoate; the working examples 2, 3, 2 and 3 are prepared by compounding low molecular hindered amine and high molecular hindered amine;

the compatilizer involved: example 1 and comparative example 1 maleic anhydride was grafted with polyethylene, example 2 and comparative example 2 maleic anhydride was grafted with polypropylene, and example 3 and comparative example 3 glycidyl methacrylate was grafted with polypropylene;

the antioxidant is prepared from hindered phenol antioxidant and phosphite ester antioxidant according to the mass ratio of 3: 1 in proportion;

the related colorant is as follows: example 1 and comparative example 1 used titanium dioxide, example 2 and comparative example 2 used carbon black, and example 3 and comparative example 3 used iron red.

The test methods of the test items referred to in tables 2 and 4 are as follows:

density: testing according to method A in GB 1033.1-2008;

cantilever beam impact performance: testing according to GB/T1843-2008 standard;

heat distortion temperature: testing according to GB/T1634.1-2004 standard;

tensile property: performing the test according to the GB/T1040.2-2006 standard, wherein the test speed is 5 mm/min;

bending property: the method is carried out according to the GB/T9341-2008 standard, the span is 64mm, and the test speed is 2 mm/min;

melt flow rate: testing according to ISO1133-1 standard under 230 deg.C and 2.16 Kg;

scratch resistance: according to the GB/T24149.3-2017 plastic automobile polypropylene (PP) special material part 3, namely the door inner plate standard;

the smell property: the method is carried out according to the GB/T24149.3-2017 plastic automobile polypropylene (PP) special material part 3: door inner plate standard.

Tables 1 and 3 show that the raw material compositions of examples 1 to 3 and comparative examples 1 to 6 were prepared by the following steps:

A. pouring the regenerated TPO skin material, the high-crystalline homo-polypropylene and the linear low-density polyethylene into a heatable high-speed mixer according to the proportion, and mixing and stirring at high speed at the temperature of 50-60 ℃;

B. then pouring the talcum powder, the weather resisting agent, the nano silver ion antibacterial agent, the compatilizer, the antioxidant and the colorant into the high-speed mixer according to the mixture ratio, and continuously mixing and stirring at high speed to obtain a mixture;

C. and then, putting the mixture into a double-screw extruder for extrusion, adding glass fiber in the extrusion process, cooling, drying and granulating.

TABLE 1

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TABLE 2

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TABLE 3

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TABLE 4

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From the above examples and comparative examples it can be found that:

1. by using a recycled TPO skin material as the primary substrate, a soft touch of the material can be provided;

2. by adding high-crystalline homo-polypropylene and linear low-density polyethylene, the comprehensive performance of the product is improved;

3. the rigidity of the product is improved and the molding shrinkage is reduced by adding the glass fiber for reinforcement;

4. the antibacterial performance of the product is improved by adding the silver ion antibacterial agent.