With the gradual maturation of the foam production and the continuous expansion of the market supply, although polyester-based flexible foams perform well, due to their high cost and high price, they are not suitable for the requirements of certain commodities. Therefore, Ester resin to replace it.
After many studies, the United States DuPont first polyether with polytetramethylene ether glycol instead of manufacturing flexible foam, the foam soft, good resilience, hydrolysis resistance, its price close to the poly Ester prices.
Later switched to inexpensive alkylene oxide, castor oil and other raw materials for the preparation of polyether resin for the production of flexible polyurethane foam products made with this polyether, better performance, lower prices, the polyurethane There was another major breakthrough in industry.
With the ongoing research work in various countries, new varieties and new processes are being developed continuously, and new equipment is continually created to make polyurethane foam fully developed. It can be said that polyurethane foam is made from polyester type, Developed