Heat-resistant impact-resistant polypropylene composition and preparation method thereof

Abstract

The invention discloses a heat-resistant impact-resistant polypropylene composition and a preparation method thereof, and belongs to the technical field of polypropylene materials. The polypropylene composite is characterized by comprising the following components in parts by weight: 100 parts of a polypropylene resin powder, 0.03-0.3 part of a hyper-branched polymer powder, 0.02-0.1 part of an inorganic nucleating agent, 0.05-0.3 part of an antioxidant, 0.02-0.1 part of an acid absorbent, and 0.03-1.0 part of an antistatic agent, wherein the polypropylene resin is a homo-polymerized polypropylene resin powder, a melt mass flow rate of the homo-polymerized polypropylene resin under the conditions of 2.16 kg and 230 DEG C is 20-60 g / 10 min, the isotacticity of polypropylene is 95% or more,and Mw / Mn is 4-12. Through the synergistic effect of a small amount of hyper-branched polyethylene and a small amount of nano-scale white carbon black added in the composition, the rigidity and toughness balance of a product is achieved, the crystallization speed is increased, and the crystallization behavior of polypropylene is improved, so that the size of resin crystals is finer and denser, thescattering and refraction of an incident light are reduced, and the glossiness of the product is increased.

Description

technical field [0001] A heat-resistant and impact-resistant polypropylene composition and a preparation method thereof belong to the technical field of polypropylene materials. Background technique [0002] Polypropylene (PP), as one of the five general-purpose plastics, has abundant sources of raw materials and low prices. Compared with other general-purpose plastics, it has better comprehensive performance and a wide range of uses, so it is favored by people. In 2016, the domestic PP demand was 22.35 million tons, but the national PP output in 2016 was around 17.3 million tons, with a market gap of nearly 5 million tons. In the next few years, the domestic high-end PP market gap will still rely on overseas imports. However, through scientific and technological modification technology, the high performance of PP can be realized to meet the needs of the market. PP post-modification methods are very rich, which can be divided into chemical modification and physical modifica...

AI Technical Summary

Problems solved by technology

At present, in most cases, modified polypropylene materials are still used to produce injection molded parts on existing low shrinkage molds suitable for engineering plastics. If the molding shrinkage of modified polypropylene materials is large, the use of modified polypropylene materials will occur. The injection molded parts made of polypropylene materials do not meet the assembly requirements; if adding a large amount of inorganic substances such as talcum powder, glass fiber, etc. has a certain effect, but it will lead to a decrease in the toughness of the material, which will greatly increase the density and color of the resin. The use of auxiliaries has adverse effects and increases the difficulty of processing; if the performance of polypropylene resin is improved by adding a large amount of organic nucleating agent and gloss agent, not only the cost is high, but also the appearance color of the product will be biased when using these auxiliaries. Yellow affects gloss

[0004] In the prior art, a highly transparent, heat-resistant and impact-resistant modified polypropylene composite material and its preparation method are obtained by adding poly 4-methylpentene-1, LLDPE, compatibilizer and other additives A heat-impact polypropylene composition, but the compatibilizer used is toxic and odorous, and the poly-4-methylpentene-1 used has poor environmental resistance and is easy to oxidize.