A vulcanizable and crosslinkable foamed polyurethane compound rubber particle and its preparation method and molding process

Abstract

The invention discloses foaming polyurethane rubber compound particles capable of being sulfurized and crossly linked as well as a preparation method and a molding technology of the foaming polyurethane rubber compound particles. The foaming polyurethane rubber compound particles capable of being sulfurized and crossly linked are prepared from an unsaturated polyurethane rubber compound, a foamingnucleating agent, a foam pore size stabilizer and a melt viscosity regulator; all the components are melted, blended and granulated to prepare blended particles; then supercritical fluid is used as afoaming agent to carry out foaming; finally, the foaming particles with stable quality, uniform foam pore distribution, high foaming rate, low size shrinkage rate and beautiful surface can be obtained; meanwhile, the obtained foaming particles also can be further sulfurized to form an interpenetrating or semi-interpenetrating network structure; the cross linking degree of the foaming particles isregulated and controlled; the obtained foaming polyurethane rubber compound particles can be widely applied to fields including vibration absorption materials, packaging materials, child toys, sportsgoods, model airplanes, heat-preservation and heat-insulation materials, automobile interior materials and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of polyurethane foam materials, in particular to a vulcanizable and crosslinkable foamed polyurethane compound rubber particle and its preparation method and molding process. Background technique [0002] Foamed plastics, also known as porous plastics, refer to materials with resin as the main body and countless tiny cells inside. Since the foam plastic is composed of a large number of cells, and the cells are filled with gas, it is also called a composite material with gas as a filler. Since World War II, foam plastics have become a very important part of the polymer industry, affecting almost every aspect of our daily lives. The rapid development of the foam plastic industry is due to its performance advantages, such as low density, light weight, heat and sound insulation, high specific strength, cushioning, etc., which can be widely used in protective packaging materials, thermal insulatio...

AI Technical Summary

Problems solved by technology

In addition, the use of a large amount of aliphatic hydrocarbons as blowing agents is also prone to explosion, and there are potential safety hazards

[0006] Another example, Chinese invention patent application CN 103709726 A uses supercritical fluid to foam thermoplastic polyurethane, and adds foaming nucleating agent and antioxidant to blend with thermoplastic polyurethane particles, and obtains foam by extrusion granulation. Foaming thermoplastic polyurethane elastomer beads; the quality of the prepared foaming material is stable and the expansion ratio is high, but it cannot realize the regulation of the melt viscosity, crosslinking degree and dimensional stability of polyurethane particles, and the prepared foaming material The strength problem during use is also open to question