Nano-silicon dioxide particle modified polypropylene and preparation thereof

Abstract

The invention provides nano silicon dioxide particle modified polypropylene and a method for preparing the same. The method uses high-concentration silica sol to replace nano silicon dioxides as filler; polypropylene, the high-concentration silica sol and auxiliary agent are uniformly mixed; and the modified polypropylene is obtained through extrusion, granulation and drying in a double-screw extruder according to the machine-shaping method of polymers. The method for adding the liquid silica sol into the polypropylene provided by the invention changes the prior single method by which nano particles can be only added into the polymers in the form of powder, and opens up a novel method for introducing the nano particles into the polymers; and the preparation method is simple in technical process and convenient in operation. By utilization of the high-concentration silica sol as the novel filler to modify the polypropylene, the prepared polypropylene composite materials have low cost, superior mechanical property and very good market application prospect.

Description

technical field [0001] The invention relates to the technical field of modified polypropylene, in particular to a nano-silica particle modified polypropylene and a preparation method thereof. Background technique [0002] The use of nanoparticles to modify polymer materials can make composite modified materials have high strength and high toughness at the same time. There are three main methods for preparing inorganic nanoparticles / polymer composites: sol-gel method; embedding method; direct dispersion method or melt blending method. Although the first two methods can obtain nanostructured composite materials, the process conditions are complicated. The third method is the most practical and convenient, but in the process of melt blending, it is difficult to break up the nanoparticle aggregates due to the limited shear force. Therefore, it is usually necessary to modify the surface of nanoparticles with grafted polymers to enhance the bonding between particles and polymers...

AI Technical Summary

Problems solved by technology

Although the first two methods can obtain nanostructured composite materials, the process conditions are complicated

The third method is the most practical and convenient, but in the process of melt blending, it is difficult to break up the nanoparticle aggregates due to the limited shear force

The existing methods for preparing inorganic nanoparticle-modified polypropylene all require surface treatment, which requires harsh conditions, complex processes, and high costs.