High-strength and high-toughness polypropylene product prepared from nucleating agent self-formed fibers

Abstract

The invention discloses a high-strength and high-toughness polypropylene product prepared from nucleating agent self-formed fibers, and relates to the technical field of polypropylene product processing. The product is prepared from the following components in parts by weight through melt blending and conventional injection molding: 100 parts of polypropylene, 0.01-3 part of beta nucleating agentand 0.1-3 part of polar additive. A fiber-forming beta nucleating agent is adopted, in the adopted injection molding process under the induction of shearing and speed, nucleating agent fibers which are arranged in the axial direction and have different length-diameter ratios can be regulated and controlled to be formed by adjusting the use amount and variety of polar additives, oriented crystallization of polymers along the surfaces of the fibers is promoted, and oriented beta-type crystal structures with different length-diameter ratios are formed. The beta-type polypropylene has good toughness, so that the obtained polypropylene product not only has remarkable axial tensile strength, but also has good toughness.

Description

Technical field: [0001] The invention relates to the technical field of polypropylene parts processing, in particular to a high-strength and high-toughness polypropylene part prepared by self-fiber formation of a nucleating agent. Background technique: [0002] Polypropylene material has excellent comprehensive properties, such as low thermal conductivity, high temperature resistance, corrosion resistance, easy processing, etc., and is widely used in various fields. However, there is still a certain gap between the performance of domestic polypropylene resin and imported resin. Most domestic polypropylene device manufacturers use imported resin for production. In 2010, my country imported more than 4 million tons of polypropylene. In addition, polypropylene devices processed by conventional techniques still have the defect of poor impact strength. The reason is that the prepared polypropylene device mainly produces coarse radial α-spherulites, and the connection between the...

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Problems solved by technology

For this reason, domestic and foreign academia and industry have conducted a lot of research on improving the mechanical properties of polypropylene, and also disclosed many new processing methods for polymer devices, such as chemically modifying polypropylene for the low-temperature toughness of polypropylene tubes. The elastic phase is introduced into the polypropylene matrix, thereby improving the low-temperature toughness of polypropylene devices (Tan, H.Li, L.Chen, Z.Song, Y.Zheng, Q., Polymer, 2005, 46,: 3522); adding carbon nanotubes in the polypropylene body, thereby improving the tensile strength of polypropylene parts (Shanju Zhang, Wei Lin, Ching-Ping Wong, Zhang, etal.Acs Applied Materials & Interfaces, 2010, 2 (6) :1642-1647.); adding β-nucleating agent induces the formation of a large number of β-crystals with excellent impact resistance in polypropylene parts, which can effectively improve the toughness of polypropylene materials (Ruihua, L., L.Zhujun, et al .Journal of Applied Polymer Science, 2012,125(4):2764-2770). However, the above method can only improve the tensile strength or toughness of polypropylene parts alone, and it is difficult to improve the strength and toughness of polypropylene materials at the same time

More importantly, in order to improve the nucleation efficiency of the nucleating agent, the processing temperature often needs to exceed 230°C, and the extreme condition needs to reach 270°C, which not only greatly increases energy consumption, but also may cause degradation, and the application potential is limited

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