Preparation method for high-impact-strength anti-photooxidation-aging polypropylene

Abstract

The invention discloses a preparation method for high-impact-strength anti-photooxidation-aging polypropylene. The method comprises the following steps: firstly adding a nano inorganic anti-ultraviolet additive into a calcium acetate aqueous solution, performing mixing under stirring, performing filtration, performing drying at the temperature of 160-200 DEG C, and performing mixing melt extrusionon the treated nano inorganic anti-ultraviolet additive, polypropylene and a beta-crystal nucleating agent according to a certain ratio, wherein the extrusion temperature is 190-220 DEG C, and the screw rod rotation speed is 30-60rpm. The method provided by the invention adopts the beta-crystal nucleating agent to induce crystallization to make the polypropylene form a beta-crystal with better photo-oxidation stability and higher impact strength, the nano-scale inorganic anti-ultraviolet additive is supplemented, so that the photooxidation aging resistance of the polypropylene is further increased; and meanwhile because the nanoparticles have a better reinforcing effect on the polypropylene, through the synergistic effect of the nano inorganic anti-ultraviolet additive and the beta-crystal form, the impact strength and photooxidation aging resistance of the polypropylene are greatly enhanced, the prepared polypropylene has excellent comprehensive mechanical properties, and the methodfacilitates expansion of an application of a polypropylene material.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a preparation method of high-impact-strength photo-oxidation-resistant polypropylene. Background technique [0002] Polypropylene material is odorless, non-toxic, and has the advantages of easy processing, impact resistance, flex resistance and good electrical insulation. It has a wide range of applications in the automotive industry, household appliances, electronics, packaging and building materials and furniture. However, it is mainly α-crystalline polypropylene (α-PP), which has poor photo-oxygen stability and is prone to UV aging during use, resulting in reduced mechanical properties, discoloration and other adverse changes, significantly reducing the service life and causing Serious waste of resources and environmental problems. In order to prolong the service life of polypropylene products, the existing modification method is to add ultrav...

AI Technical Summary

Problems solved by technology

However, inorganic nano anti-ultraviolet additives do not have a β-nucleation effect, but usually have a strong α-nucleation effect on polypropylene crystals. Direct addition affects the nucleation effect of the β-nucleating agent, resulting in the failure of polypropylene to form β-crystal

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