A kind of high gloss and low linear expansion coefficient polypropylene composite material and its preparation method

Abstract

The invention relates to the technical field of polymer materials, in particular to a high-gloss and low linear expansion coefficient polypropylene composite material and a preparation method thereof, wherein the composite material is composed of the following raw materials in parts by mass: 70-80 parts of polypropylene; 0-0.5 part of nucleating agent; 1-1.5 part of brightener; 15-20 part of filler; 0.1-0.3 part of antioxidant; 0.1-0.3 part of lubricant; 0-1 part of antibacterial agent; Whiskers, mica, and nano-montmorillonite; the whiskers are composed of calcium carbonate whiskers, magnesium sulfate whiskers, and basalt whiskers. The invention provides a polypropylene composite material with high gloss and low linear expansion coefficient, which has high gloss and can effectively reduce the linear expansion coefficient of polypropylene material, and the material has both antibacterial properties and can solve the problem of polypropylene in daily life. The severe shrinkage of the material due to post-crystallization has important practical benefits.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polypropylene composite material with high gloss and low linear expansion coefficient and a preparation method thereof. Background technique [0002] Polypropylene resin raw materials are widely used in automobile parts, household items, electronics, etc. Electrical and other fields. However, due to its low gloss (about 80), the linear expansion coefficient is high (9.05×10 -5 / K) and its own lack of antibacterial effect, resulting in its application in some fields has received a limit, low gloss makes it unable to cover some household appliances with high color requirements, such as washing machines, smart toilet covers, etc., linear The high expansion coefficient leads to different degrees of shrinkage of the parts due to changes in external temperature when producing some large automotive parts (such as car bumpers, door panels, etc.), resulting in shortcomings i...

AI Technical Summary

Problems solved by technology

However, due to its low gloss (about 80), the linear expansion coefficient is high (9.05×10 -5 / K) and its own lack of antibacterial effect, resulting in its application in some fields has received a limit, low gloss makes it unable to cover some household appliances with high color requirements, such as washing machines, smart toilet covers, etc., linear The expansion coefficient is high, which leads to different degrees of shrinkage of the parts due to changes in external temperature when producing some large automotive parts (such as car bumpers, door panels, etc.), resulting in shortcomings in its application.

In addition, with the improvement of human health requirements, the enhancement of antibacterial awareness will become more and more obvious, and the non-antibacterial properties of polypropylene materials will also be worried by consumers, resulting in the limitation of its application

[0003] Regarding the preparation method of high-gloss polypropylene, relevant patents have proposed some solutions. Patent CN104693602A provides a method for preparing a high-flow, high-gloss color metal pearlescent effect spray-free polypropylene automotive material, but its metal powder, pearlescent powder Too much addition will seriously affect the mechanical properties of the material, and at the same time, it will cause defects such as weld marks due to powder accumulation. Regarding the preparation method of polypropylene with low linear expansion coefficient, the patent CN106317607A provides an ultra-low linear expansion coefficient polypropylene composite material and its The preparation method, but the inorganic filler Sc used in it 2 W 3 o 12 It has the characteristics of high price, which leads to its limited application

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