Reinforced and toughened anti-ageing polypropylene composite material and preparation method thereof

Abstract

The invention belongs to the technical field of polypropylene modification, and in particular relates to a reinforced and toughened anti-ageing polypropylene composite material and a preparation method thereof. The composite material is prepared from polypropylene, high-density polyethylene, ternary ethylene propylene rubber, a reinforcing filler and an inorganic anti-aging agent. The preparation method comprises the following steps: treatment on the reinforcing fillers with a carbon silicon coupling agent, mixing, melt extrusion, cooling, drying and pelletizing, so as to obtain the reinforced and toughened anti-aging polypropylene composite material. The invention has advantages of reasonable formula, simple process and convenient operation; and the prepared polypropylene composite material has tensile strength retention rate increased by 4%-10% and impact strength retention rate increased by 10%-30% compared with pure polypropylene.

Description

technical field [0001] The invention belongs to the technical field of polypropylene modification, and in particular relates to a reinforced, toughened and anti-aging polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene (PP) is one of the resins with the largest output in the world. It is a crystalline polymer with regular structure. It has low density, non-toxicity, easy processing, low hygroscopicity, high impact strength, chemical corrosion resistance, and electrical insulation properties. Good quality and high cost performance, widely used in construction, automobile, packaging, machinery and other fields. However, there are a large number of tertiary carbon atoms in PP, which are easy to dehydrogenate to generate free radicals under ultraviolet light irradiation and trigger subsequent oxidative degradation reactions, thereby causing chain reaction damage to polypropylene molecules, resulting in poor weather resis...

AI Technical Summary

Problems solved by technology

However, there are a large number of tertiary carbon atoms in PP, which are easy to dehydrogenate to generate free radicals under ultraviolet light irradiation and trigger subsequent oxidative degradation reactions, thereby causing chain reaction damage to polypropylene molecules, resulting in poor weather resistance of polypropylene products, and under the action of ultraviolet light The lower performance is extremely easy to deteriorate, mainly manifested in discoloration, chalking, surface cracking, loss of gloss and decline in mechanical properties, which greatly limits its use in structural materials and engineering plastics

However, organic UV absorbers in traditional light stabilizers have small molecular weight, high mobility, poor stability, and are easily disturbed by other environmental factors; quenchers are generally toxic and cannot meet the requirements for preparing non-toxic and environmentally friendly materials; hindered amines are light stable The agent has a strong alkalinity, which affects its use effect, and the low-alkalinization treatment process is complicated

Moreover, there are many types of existing polypropylene composite materials, but most of them are unsatisfactory in performance parameters such as strength, toughness and aging resistance.