A method for one-time production of colored TPU foamed particles using twin-screw equipment

Abstract

The invention discloses a method for producing colored TPU foamed particles at one time by using twin-screw equipment, which includes the following steps: (1) Proportioning raw materials: 100 parts by weight of TPU resin, 2-5 parts by weight of POE-g-MAH and 1‑3 parts by weight of organic pigments; (2) stirring and mixing: (3) heating and melting; (4) injecting gas: setting a reverse spiral thread in the sixth zone of the twin-screw, and injecting nitrogen or carbon dioxide gas here; (5 ) The gas is mixed evenly with the melted material: the meshing block is set in the seventh to ninth zones of the twin-screw to fully mix the injected gas, organic pigment, TPU resin, POE‑g‑MAH; (6) cooling extrusion; ( 7) Cooling and shaping. By adopting the method of the present invention, colored TPU foamed particles can be prepared in one step, which simplifies the foaming process, reduces the cost, and reduces the physical property changes caused by the repeated thermal processing of TPU resin in the past. It is suitable for large-scale production, and the color and cell The density can be adjusted arbitrarily, which has 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...

AI Technical Summary

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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