Modified filler with high β-nucleation effect on polypropylene and preparation method of high β-crystalline polypropylene or its copolymer

Abstract

The invention discloses a preparation method of a modified filling material with a high beta-nucleation effect on polypropylene and a preparation method of beta-crystal polypropylene or a copolymer of the beta-crystal polypropylene. The preparation method of the modified filling material comprises the following steps of dissolving calcium acetate in water, mixing the calcium acetate solution and an unmodified filling material, filtering, drying at a temperature of 30 to 200 DEG C to obtain a desired calcified filling material, dissolving an aliphatic dicarboxylic acid in acetone, mixing the aliphatic dicarboxylic acid solution and the calcified filling material, and drying to obtain the modified filling material. The preparation method of the beta-crystal polypropylene or the copolymer of the beta-crystal polypropylene comprises mixing polypropylene or a polypropylene copolymer and the modified filling material at room temperature and carrying out melt extrusion and mixing granulation at a temperature of 180 to 230 DEG C to obtain desired products. Compared with the prior art, the preparation method can prepare a filling material which has a high beta-nucleation effect on polypropylene and can be prepared into polypropylene products maintained original tensile strength and bending strength of polypropylene, and solve the problems that beta-crystal polypropylene has low yield strength and modulus.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a method for preparing a modified filler with high β-nucleation effect on polypropylene and a high β-crystal polypropylene or a copolymer thereof. Background technique [0002] Polypropylene (PP) has various crystal forms, such as α-crystalline polypropylene and β-crystalline polypropylene, and the commonly used polypropylene is usually α-crystalline polypropylene. In order to improve and improve the physical and mechanical properties of polypropylene, a variety of inorganic particles are commonly used as fillers to compound with polypropylene to prepare filled polypropylene materials. However, the addition of these fillers to polypropylene does not change the crystal form of polypropylene, and filled polypropylene mainly forms α-crystalline polypropylene; although some fillers can induce polypropylene to form β-crystalline polypropylene, the cont...

AI Technical Summary

Problems solved by technology

Most fillers play an α-nucleation effect on the crystallization of polypropylene and its copolymers. The α-nucleation effect of the filler interacts with the β-nucleation effect of the β-crystal nucleating agent, resulting in the β-crystal nucleating agent The β-nucleation efficiency is significantly reduced, and it is difficult to obtain high β-crystal content polypropylene, even adding high-cost β-crystal nucleating agents without β-PP formation

Second, fillers with α-nucleation usually lead to a decrease in the impact properties of polypropylene and its copolymers

Although a large number of filler-filled polypropylene has been reported at home and abroad, there have been no reports of modified fillers with high-efficiency β-nucleation and filled polypropylene and its copolymers with high β-crystal content.

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