Polypropylene composite material with low linear expansion coefficient and high surface hardness and preparation method thereof

Abstract

The invention relates to a polypropylene composite material with low linear expansion coefficient and high surface hardness, which comprises the following components by weight: 100 parts of PP resin, 5 to 15 parts of functional fused silica powder, 10 to 20 parts of functional wollastonite powder, 8 to 15 parts of POE, and 0.3 to 0.5 part of an antioxidant. The functional wollastonite powder is a product obtained after wollastonite is subjected to surface treatment by an ultra-dispersion coupling agent, and the weight part ratio of the wollastonite to the ultra-dispersion coupling agent is (20: 1)-(25: 1); the functional fused silica powder is a product obtained after surface treatment is carried out on fused silica through an ultra-dispersion coupling agent, and the weight part ratio of the fused silica to the ultra-dispersion coupling agent is 25: 1-30: 1; the linear expansion coefficient of the fused silica is 0.5 * 10<-6> mm / mm / DEG C; the ultra-dispersion coupling agent is a coupling agent SP-1013 produced in Huchhua of Shanghai. The polypropylene composite material disclosed by the invention has the advantages of lower linear expansion coefficient, high surface hardness, no glass fiber addition and no floating fiber risk, and can be widely applied to the fields of automobiles, household appliances and home furnishing.

Description

technical field [0001] The invention belongs to the technical field of polypropylene composite materials, and relates to a polypropylene composite material with low linear expansion coefficient and high surface hardness and a preparation method thereof. Background technique [0002] Due to its low density, excellent chemical resistance, good molding processability, and certain price advantages, polypropylene has become a common material in the fields of automobiles, home appliances, and LEDs. However, due to its own structure, the surface hardness of polypropylene Relatively low, poor dimensional stability, relatively large linear expansion coefficient, it is difficult to meet the requirements of relatively high dimensional stability due to temperature changes. [0003] Research on polypropylene composite materials with low linear expansion coefficient and high surface hardness has been reported. Publication No. PCT / CN2020 / 110659 discloses ultra-low linear expansion coeffici...

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Problems solved by technology

The publication number is CN113024953 A, which discloses a low shrinkage rate and low linear expansion coefficient modified polypropylene material and its preparation method. The invention uses furfuryl-amino monomers and carboxylated multi-walled carbon nanotubes to prepare under the action of a catalyst. Modified carboxylated multi-walled carbon nanotubes, and then added modified carboxylated multi-walled carbon nanotubes to polypropylene to obtain a modified polypropylene material with low shrinkage and low linear expansion coefficient, but the steps of the invention are relatively complicated, And it can only be made in black, not suitable for occasions of other colors

The publication number is CN 112759832A, which discloses a continuous glass fiber reinforced flame-retardant polypropylene composite material with isotropic low linear expansion coefficient and its preparation. Polypropylene, continuous glass fiber, antioxidant, flame retardant, inorganic whisker , compatibilizer, and silsesquioxane. Although the material has isotropy and low linear expansion coefficient, the material has a certain risk of floating fibers, which limits its use.

[0004] The minerals used for the existing mineral-filled polypropylene materials are mainly talcum powder and calcium carbonate. Such modified materials can meet the customer's use requirements in conventional occasions, but their use is restricted in occasions with high size requirements.

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