Toughened and modified small scale bulk powder polypropylene and preparation method thereof

Abstract

The invention belongs to the field of high molecular materials, and in particular relates to toughened and modified small scale bulk powder polypropylene and a preparation method thereof. The toughened and modified small scale bulk powder polypropylene is prepared from the following components in parts by mass: a base stock containing 50 to 80 parts of small scale bulk powder polypropylene, 3 to 20 parts of polypropylene copolymer and 5 to 30 parts of toughening agent, 5 to 30 parts of filler, 0.1 to 4 parts of stabilizing agent, 0.5 to 3 parts of lubricating agent, 0.5 to 4 parts of dispersing agent and 1 part of coupling agent. The filler and the coupling agent are processed, and then are centrifugally separated and oven-dried, so as to obtain a raw material A; other components are oven-dried at a temperature of 60 DEG C to 80 DEG C and are mixed with the raw material A, so as to obtain a raw material B; the raw material B is extruded and granulated to obtain a granular material C; the raw material C is uniformly mixed with the polypropylene copolymer and the toughening agent according to a proportion, and an obtained mixture is granulated to obtain a toughened and modified polypropylene granular material. A cantilever beam made from the toughened and modified small scale bulk powder polypropylene has the impact strength which can be increased by 20 times at most, and has a heat distortion temperature which can be increased by 10 DEG C.

Description

(1) Technical field [0001] The invention belongs to the field of polymer materials, in particular to a toughened and modified small-body powder polypropylene and a preparation method thereof. (2) Background technology [0002] Polypropylene (PP) is one of the five general-purpose plastics. Because of its abundant raw material sources, cheap price, easy molding and processing, and excellent product comprehensive performance, it has a wide range of uses and has been widely promoted and applied. However, PP also has some shortcomings. Its biggest disadvantage is poor cold resistance, low temperature brittleness, followed by large shrinkage, poor creep resistance, and poor aging resistance, especially for homopolypropylene with a small body. [0003] Copolymerized polypropylene (PPR) is a new generation of polypropylene material formed by randomly and uniformly polymerizing 3-5 parts of ethylene monomer in the molecular chain of PP by gas phase copolymerization process in the la...

AI Technical Summary

Problems solved by technology

[0006] Although rubber or elastomer can significantly increase the toughness of PP, but at the same time reduce the modulus, strength and heat distortion temperature of the blend, while rigid particles toughen PP, although the toughening effect is limited, it can slightly improve the material resistance. While improving the impact properties, the tensile strength and rigidity are not reduced, and the processing fluidity and heat resistance will be correspondingly improved with the addition of rigid particles.

Images