Polypropylene composition and preparation method thereof

Abstract

The invention discloses polypropylene composition which comprises the following compositions by weight percent: 52-92 wt% of polypropylene, 5-15 wt% of elastomers, 0.5-2 wt% of oxethyl compounds, 0-30 wt% of talcum powder, and 0.5-1 wt% of a processing agent. The preparation method of the polypropylene composition comprises the following steps: (a), weighing the compositions as per the weight matching ratio, and adding the compositions into a highly mixing machine to mix for 1-3 minutes, so as to obtain pre-mixing materials, wherein the rotating speed is 1000-2000 rpm; (b), smelting and extruding the pre-mixing materials by a double-screw extruder, and carrying out vacuum granulation, so as to obtain the pastiness resistant polypropylene composition, wherein the temperature of various areas of screw rods is 190-230 DEG C. According to the invention, the oxethyl compounds have the conventional powder dispersing function, and have the pastiness resistant effect on the surface of a polypropylene material, so that the types of pastiness resistant agents used in the polypropylene composition are increased; the preparation method is simple and feasible, the equipment requirement is low, the product yield is high, and the polypropylene composition can be widely applied to the production of automobile used interior trimming parts such as fascia boards, auxiliary fascia boards, uprights, glove boxes, door panels and thresholds.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polypropylene composition and a preparation method thereof. Background technique [0002] Polypropylene has been widely used in automobiles recently due to its advantages of low cost, light weight, high strength, good chemical resistance, good processing technology, and easy recycling. However, when the modified polypropylene is used as a car interior at a higher temperature, the surface of the material will be sticky. This is because some small molecular additives are often added to polypropylene modified materials during the production process, such as antioxidants, lubricants, light stabilizers, etc., to meet the requirements of thermal and oxygen degradation resistance, processing performance and product quality during material processing. Long-term anti-photooxidative aging performance and other requirements. These small molecule additives generally have a low melting po...

AI Technical Summary

Problems solved by technology

Patent US4146586 uses polyester and polypropylene to prepare anti-adhesive polypropylene materials, but the melting temperature difference between the two is large, and processing is difficult

Patent CN102140202 uses SEBS to absorb excess organic small molecules, oligomers and other oily substances produced in the preparation of polypropylene composite materials, preventing these oily substances from migrating to the surface of the material, thereby improving the anti-sticking performance of the material, but commercialized SEBS It is often an oil-filled product, and the oil contained in it may cause problems to the VOC of the product