Preparation method of polypropylene composite material with high strength and high toughness

Abstract

A preparation method of a polypropylene composite material with high strength and high toughness belongs to the fields of chemical engineering and fine chemical industry. The preparation method comprises the following steps: weighing components according to the following mass percents: 10-45% of homopolymerized polypropylene, 10-25% of copolymerized polypropylene, 15-40% of copolymerized polypropylene, 9-16% of POE, 5-35% of polypropylene reinforcing toughening modifiers, 0.15-0.4% of nucleating agents, 0.25-0.55% of anti-oxidants, and 0.2-0.5% of lubricants; adding the weighed materials into a high-speed mixer, fully mixing at a speed of 1000 r / min for two minutes, releasing the materials; adding the mixed materials into a hopper of a double screw extruder, extruding the materials according to technological parameters to obtain the composite material particles. According to the polypropylene composite material of the invention, the crystallization state of polypropylene is changed by components of the polypropylene reinforcing toughening modifier, the ethane-octylene copolymer, the nucleating agent and the like, and thus mechanical properties such as strength and toughness of the composite material are changed.

Description

technical field [0001] The invention belongs to the fields of chemical engineering and fine chemical industry, and in particular relates to a processing and preparation method of a composite material with high strength and high toughness produced by high polymer compound. Background technique [0002] In the prior art, polypropylene has always been highly valued by practitioners in the plastic processing industry due to its excellent mechanical properties, so that more and more plastic products with polypropylene as the main body appear in daily life. The main advantages of polypropylene are low density, high strength, good toughness, and high heat distortion temperature. But it also has certain defects, such as poor low temperature resistance, low notched impact strength, poor aging resistance, and large shrinkage rate. These shortcomings restrict its application in life and production. With the continuous advancement of science and technology in recent years, people have ...

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Problems solved by technology

The current method of toughening polypropylene is mainly to add copolymers, such as copolymers of ethylene and propylene, and toughening agents, such as ethylene-propylene-diene rubber (EPDM), ethylene-octene copolymer (POE), ethylene-propylene rubber ( EPR), styrene-butadiene-styrene block copolymer (SBS) and other elastomers, but the addition of these elastomers significantly improves the toughness of the product while losing its strength, which greatly reduces its strength. At the same time, because the price of elastomers is relatively expensive, the cost increases, which brings pressure to the production enterprises. Therefore, in recent years, people have considered using inorganic fillers to improve the strength and toughness of polypropylene, but through a large number of reports. Generally, the inorganic fillers used are either talcum powder or calcium carbonate with coarse particles, or nano-inorganic fillers with very fine particles. These two addition methods have their corresponding disadvantages. Its strengthening and toughening effects are not beneficial to the performance of the product; the second type, because its particles are too fine, often agglomerates, so it cannot exert the effect of its nanomaterials, and it is often necessary to find a suitable dispersant to make nanocarbonic acid Calcium can be evenly dispersed in the polymer

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