Ultralow-linear expansion coefficient polypropylene composite material and preparation method thereof

Abstract

The invention relates to an ultralow-linear expansion coefficient polypropylene material and a preparation method thereof. The material is prepared from 90-98 parts of polypropylene, 2-10 parts of Sc2W3O12, 0.1-0.5 parts of a coupling agent, 0.1-1 part of a heat stabilizer, 0-1 part of a lubricant and 0-0.5 parts of white oil, wherein the weight part sum of the polypropylene and Sc2W3O12 is 100. One-dimensional Sc2W3O12 is added to the polypropylene material in order to reduce the linear expansion coefficient of the composite material, so the prepared polypropylene composite material has a low linear thermal expansion coefficient, and can be applied to the aerospace field, the optical field, the communication field and other fields with high material dimension change requirements.

Description

technical field [0001] The invention relates to the technical field of polypropylene, in particular to an ultra-low linear expansion coefficient polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene material is widely used in automobiles, electronic products and other fields due to its advantages of low price and light weight. However, the polypropylene material itself has a large linear expansion coefficient, which makes it difficult to meet the dimensional requirements of precision parts and the dimensional stability requirements in the use environment with large temperature changes. [0003] In order to solve this problem, traditional inorganic fillers such as talcum powder with aspect ratio are usually added to polypropylene materials to reduce the linear expansion coefficient of the material. However, this method can reduce the linear expansion coefficient to a limited extent, usually the linear expansion coeffic...

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Problems solved by technology

However, this method can reduce the linear expansion coefficient to a limited extent, usually the linear expansion coefficient of pure polypropylene raw materials is about 12*10 -5 / °C, when the filling amount of talcum powder reaches 20%, the linear expansion coefficient of the material can be reduced to 8*10 -5 / °C, but the filling amount is large, there will be disadvantages such as shrinkage change, loss of material properties, increase in density, etc.

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