A kind of preparation method of ultra-high density polyurethane flexible foam

Abstract

The invention relates to a method for preparing ultra-high-density flexible polyurethane foam, which is characterized in that it is prepared by mixing and reacting the following components in parts by mass: 100-115 parts of polyether polyol, 13-15 parts of TDI-90, water 0.5-0.6 parts, 1.2-1.3 parts of silicone oil, 0.2-0.25 parts of stannous octoate, 0.3-0.35 parts of amine catalyst A-33; the specific steps are as follows: add the above materials except TDI to the mixing tank in turn, mix and stir evenly, Set aside for 3min to 5min, then pour TDI‑90 into the mixing barrel, control the temperature at 25°C to 30°C, stir rapidly for 5s to 8s, then pour into the foaming box for foaming, ripen and then cut. The preparation method is simple, the materials are easy to obtain, ordinary silicone oil and TDI-90 can achieve ultra-high density, no special additives are needed, it is easy for industrial promotion, and the production cost is reduced.

Description

A kind of preparation method of ultra-high density polyurethane flexible foam technical field The invention belongs to chemical technology field, be specifically related to a kind of preparation method of ultra-high density polyurethane soft foam. Background technique Polyurethane soft foam, refers to soft polyurethane foam, is a kind of flexible polyurethane with certain elasticity. Foamed plastic, which is the most used polyurethane product in polyurethane products. According to the degree of softness and hardness, that is, the difference in load resistance performance At the same time, polyurethane soft foam can be divided into ordinary soft foam, super soft foam, high load-bearing soft foam, ultra light soft foam, etc. according to the production process At the same time, polyurethane soft foam can be divided into block soft foam and molded soft foam. Block soft foam is produced by continuous process. The foam is then cut into foam products of the desired shape...

AI Technical Summary

Problems solved by technology

[0003] Ultra-high-density polyurethane soft foam is widely used in shoe materials and other fields due to its high density. However, due to the high foam opening rate, it is greatly affected by local air pressure and raw materials. It generally requires special silicone oil and catalysts to realize production. high cost

Images