Foamed type TPU (thermoplastic polyurethane elastomer) material and preparation method thereof

Abstract

The invention relates to a foamed type TPU (thermoplastic polyurethane elastomer) material and a preparation method thereof. The preparation method comprises the following steps: polymer polyol, diisocyanate and a chain extender are taken and poured into a casting machine to be mixed uniformly, then a mixture I is added to a first reactive extrusion machine for a polymerization reaction, and a TPU polymer melt is obtained; a physical foaming agent is injected into the tail end of a screw of the first reactive extrusion machine, the TPU polymer melt is mixed preliminarily with the physical foaming agent, and a mixture II is obtained; the mixture II is added to a second reactive extrusion machine, and the physical foaming agent and the TPU polymer melt are mixed uniformly to form a homogeneous system; the homogeneous system passes through a neck ring mold of the second reactive extrusion machine and then is subjected to underwater palletizing, and foamed thermoplastic polyurethane particles are obtained; the foamed thermoplastic polyurethane particles are dehydrated and dried, and the foamed type TPU material is obtained. The foamed type TPU material has stable foaming density, the batch-to-batch product quality is stable, central control monitoring is performed at any time, and the yield is increased.

Description

technical field [0001] The invention relates to a foaming thermoplastic polyurethane elastomer material and a preparation method thereof, belonging to the field of foaming materials. Background technique [0002] Using plastic as a matrix, a large number of air bubbles are filled inside the plastic by physical or chemical methods to obtain a polymer foam material. Foam materials have a series of advantages such as low density, heat and sound insulation, high specific strength, and cushioning, so they are widely used in packaging, industry, agriculture, transportation, military industry, aerospace industry, and daily necessities. Commonly used types of foam are polyurethane (PU) soft and rigid foam, polystyrene (PS) foam, polyethylene (PE) foam, polypropylene (PP) foam, etc. However, isocyanate is likely to remain in the foaming process of polyurethane foam, which is harmful to the human body, and the foamed material cannot be recycled. Polystyrene foam products are difficu...

AI Technical Summary

Problems solved by technology

For the intermittent kettle pressure foaming process, the product quality inspection needs to be carried out after the production of each kettle is completed, and the central control monitoring and adjustment of product quality cannot be achieved, which will easily cause a large number of unqualified products; this process requires a very large volume. Large reactors and receiving tanks are used to meet the production capacity and receive expanded particles, and subsequent large-scale transportation, dehydration, and drying equipment are also required for post-processing, which leads to expensive equipment costs; the production time of each batch of materials is usually In 6-8 hours, there are problems such as low production efficiency; because kettle pressure foaming is a batch production process, it is difficult to ensure the stability of the quality of the final product batches, and the TPU material is soaked in high pressure for a long time during the production process. , High temperature water will lead to hydrolysis of TPU material, affecting the physical properties of subsequent foaming materials

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