Preparation method for polypropylene-toughened impact-resistant tubular product

Abstract

The invention relates to a preparation method for a polypropylene-toughened impact-resistant tubular product. The preparation method comprises the following steps: A, weighing raw materials in parts by mass: 100 parts of polypropylene, 5-30 parts of a polyolefin toughening agent, 5-10 parts of inorganic filler, 0.01-1.0 part of an antioxidant and 0.01-1.0 part of an ultraviolet adsorbent; B, drying: drying the raw materials at 60-80 DEG C; C, preparing a premix: after mixing the polypropylene, the polyolefin toughening agent and the inorganic filler in a certain proportion, stirring the raw materials in a low-speed stirrer to be stirred for 10-12 minutes, then adding the antioxidant and the ultraviolet adsorbent, and continuously stirring the mixture for 2-5 minutes; and D, extruding the tubular product: feeding the prepared premix into a single screw extruder, controlling the processing temperature at 160-210 DEG C, controlling the rotating speed of the screw at 60-90 rpm, and extruding the toughened and modified polypropylene tubular product.

Description

technical field [0001] The invention relates to a preparation method of a polypropylene toughened anti-impact pipe. Background technique [0002] Polypropylene has the advantages of low density, odorless and non-toxic, hygienic, good heat resistance and corrosion resistance, etc. It is widely used in cold and hot water plastic piping systems, but due to poor toughness and low impact strength of polypropylene, especially at low temperatures High brittleness greatly limits the development of polypropylene piping systems in cold regions. Therefore, improving the toughness of polypropylene pipes has important theoretical support and economic benefits. [0003] The method of polypropylene toughening is mainly divided into two categories, one is chemical toughening, that is, some atoms or groups that are beneficial to improve the toughness of polypropylene are copolymerized to the polypropylene chain; the other is physical modification, by adding toughening to modify To improve ...

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Problems solved by technology

[0004] Chinese invention patent ZL201210523848.3 introduces a method of using initiators and toughening agents to toughen modified polypropylene and prepare polypropylene products. However, the introduction of initiators will make the effects of dispersion and action during processing difficult to control. Very easy to cause problems such as uneven dispersion, excessive cross-linking or polypropylene degradation

In addition, the Chinese invention patent ZL201110308569.0 introduces a preparation method for toughening and modifying high-impact polypropylene materials using a toughening agent ethylene-vinyl acetate copolymer, a vulcanizing agent and a vulcanizing agent, but this method introduces a vulcanizing agent , will bring a greater odor to the product, which is not conducive to the hygienic performance of the pipe

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