A kind of polypropylene composition and preparation method thereof

Abstract

The invention discloses a polypropylene composition, which comprises the following components by weight percentage: 52-92wt% polypropylene, 5-15wt% elastomer, 0.5-2wt% ethoxylate, 0-30wt% talcum powder , 0.5~1wt% processing aid; the preparation method of the polypropylene composition is as follows: a) Weigh each component according to the weight ratio, add it to a high mixer and mix it for 1~3 minutes at a speed of 1000~2000 rpm / min to obtain a premix; b) the premix is ​​melted and extruded by a twin-screw extruder, the temperature of each zone of the screw is 190~230°C, and the anti-sticking polypropylene composition is obtained by vacuum granulation; the ethoxylate of the present invention In addition to the role of conventional dispersing powder, the base compound also plays an anti-sticking effect on the surface of polypropylene materials, thereby increasing the variety of anti-sticking agents used in polypropylene compositions; the preparation method is simple and easy, With low equipment requirements and high product yield, it can be widely used in the production of automotive interior parts such as dashboards, sub-dashboards, pillars, 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