One-time manufacturing method of colorful TPU foamed particles through double-screw equipment

Abstract

The invention discloses a one-time manufacturing method of colorful TPU foamed particles through double-screw equipment. The method comprises the following steps of (1) proportioning raw materials comprising, by weight, 100 parts of TPU resin, 2-5 parts of POE-g-MAH and 1-3 parts of organic pigments; (2) conducting stirring and mixing; (3) conducting heating and melting; (4) injecting gas, specifically, arranging left-handed threads in a sixth area of a double-screw and injecting nitrogen or carbon dioxide gas to the sixth area; (5) evenly mixing the gas and the molted materials, specifically,arranging engagement blocks from a sixth area to a ninth area of the double-screw to enable the injected gas, the organic pigments, the TPU resin and the POE-g-MAH The invention be mixed evenly; (6)conducting cooling extrusion; and (7) conducting cooling and shaping. Through the method, the colorful TPU foamed particles are manufactured at a time, the forming process is simplified, and the costis reduced. Physical property changes, caused by repeated heating and processing, to the TPU resin originally are reduced. The method is suitable for mass production. Moreover, the color and forming density of the colorful TPU foamed particles can be adjusted at random. The method has the good promotion and utilization value.

Description

technical field [0001] The invention relates to the technology in the field of foam material preparation, in particular to a method for preparing colored TPU foam particles at one time by using twin-screw equipment. Background technique [0002] TPU foam material is actually a new type of polymer material composed of numerous elastic and light weight TPU foam balls. After foaming, the volume of this particle material expands 5-8 times, and the cells The diameter is only about 30 microns to 300 microns, the size and shape are the same as popcorn, and the density of 0.15-0.25 grams per cubic centimeter makes people hardly feel its weight. Therefore, it is called "popcorn" by the industry. It overcomes the shortcomings of TPU raw materials such as heavy weight, high hardness, and poor shock absorption performance. At the same time, it is lighter in weight, more breathable, environmentally friendly, wear-resistant, high-elastic, and yellowing-resistant. It is the insole material...

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Problems solved by technology

[0004] In view of this, the present invention aims at the deficiencies existing in the prior art, and its main purpose is to provide a method for making colored TPU foamed particles at one time by using twin-screw equipment, which can effectively solve the problem of foaming of existing TPU foamed particles. The process is complicated, the cost is high, and the physical properties of the TPU resin are changed due to repeated thermal processing during the preparation process

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