A preparation method of expanded particles and the prepared expanded particles and application thereof

Abstract

The invention relates to a preparation method of foam particles. The preparation method of the foam particles comprises the following steps: S1, a microwave sensitizer is embedded into an expandable base material in a mass ratio of the microwave sensitizer to expandable base material being 0.01-2:92.5-98, and preprocessed particles are obtained; S2, the preprocessed particles obtained in the step 1 are mixed with a foaming agent and a foaming penetration enhancer, the mixture is placed in a closed container and left to stand to enable the foaming agent to penetrate the preprocessed particles sufficiently, and a foamed pre-expanded body is obtained; S3, the foamed pre-expanded body obtained in the step 2 is subjected to microwave heating and subjected to surface cooling anti-sticking processing, foaming is performed, and the foam particles are obtained. The method can be applied to foaming of various polymer elastomers, the process is simple, and requirements for conditions are low. Various thermoplastic polyurethane foam particles prepared with the method have excellent performance.

Description

Technical field [0001] The present invention relates to the field of polymer material preparation, and more specifically, to a method for preparing expanded particles, expanded particles prepared therefrom, and applications of the expanded particles. Background technique [0002] Polymer expanded particles are a gas / solid two-phase composite material composed of an expandable matrix material and gas molecules. In this two-phase composite material, the bubbles can be the dispersed phase and the polymer is the continuous phase; or the bubbles and the polymer are both continuous phases. The bubbles dispersed in the expandable matrix material can significantly change the shape, structure and properties of the polymer, so that the polymer foamed particles have certain unique properties. They are widely used in household daily necessities, transportation, insulation materials, packaging materials, electrical appliances, sports facilities, electronic products and chemical and textile i...

AI Technical Summary

Problems solved by technology

[0009] Among the above three methods, although the first method is currently the only method that has entered mature industrial production, it needs to be combined with several other materials in the production. The process is complicated, the cost is high, and it is exclusively owned. It is easy to form a monopoly situation in the market, which is not conducive to the production, application and promotion of this material

[0010] The second method is theoretically feasible, but in actual production, the final product has extremely strict process requirements, and it is difficult to control the production of foamed particles with stable quality. So far, it only stays on paper and has no actual industrial application;

[0011] Although the third method is better than the second method, it involves high temperature and high pressure in production, which buys hidden dangers for production safety in actual production. Moreover, it is intermittent production, and the output is affected, so it needs to be improved.