Bayer earlier production the soft foam is polyester

 The basic use of the 65/35 toluene diisocyanate, adipic acid side chain part of the series of polyester, amine catalysts, ionic surface active agent as raw materials. At the same time also address continuous mechanical foam production process, so that production technology has a major breakthrough plant. In 1953, Bayer introduced in the U.S. fight the technology. In 1954, Bayer and Monsanto merged with Mobei U.S. companies, so that the original polyester foam manufacturing technology has improved to some extent. It utilizes the relatively cheap price of 80/20 toluene diisocyanate and a series of new polyester, the catalyst also made some improvements. Further promote the development of the foam.

soft polyester foam brush is better in strength, and has antioxidant aging, oil resistance, solvent resistance and other properties, but does not apply when the U.S. needed the cushion material. It compared with latex foam, comfort is poor, mainly because of its low deformation, high modulus, resilience is also poor, and early aging of polyester foam wet performance is not ideal, but has been back not used in furniture cushions and other industries. With the research progress, some improvement of their performance not only improved the aging properties of wet and soft, and cartridges Tanxing also been improved, but they did not like the polyether-based foam cushion as Nenggou widely used in industry . Its excellent mechanical strength and unique oil, anti-solvent properties, in addition to cushioning material for shock, but some also used fabric lining.

20 century,bailey UGG boots, 50's, the U.S. has also developed a series of castor oil as the raw material of soft foam, some of which also has good flexibility and resistance to hydrolysis, but the process is repeated in the hair Huai poor, so when industrialization in the first turn to catch up quickly replaced by polyether-based foam.

1954, the U.S. chemical companies Huaianduote Hayes proposed using propylene oxide and ethylene oxide as raw materials for the preparation of the tomb of ethylenediamine block basis of the total polyether, and published for system Preparation of Polyurethane

, which attracted greater attention, after which the companies were competing for research. Polyether materials used such as propylene oxide, mainly from the petrochemical industry, not only easy to get raw materials, low cost, but also synthesis of various functional groups and different molecular weight as high as ether, in order to make the different chain and different crosslinking density the foam. It polyester compared to more flexible products, good elasticity, compressive deformation, wet aging well, more importantly, its deformation curve is more ideal for the manufacture of cushion products. At the same time foam technology, as well as the progress of mechanical foaming step Sanya ethyl diamine catalyst and organic pot appears to speed up the development of such polyether foam. It can not only simplify the production process, and can be relatively large as needed to adjust its performance, which has been developed quickly.

20 century, during the 60's to 70's, in order to meet the needs of different uses, enhancing the performance, further simplifying production processes and reduce costs, for a lot of technical development. In terms of a rectangular block foam technology foam, hot foam shape molding process and the foam and spray foam and other foam technology. Later, on the basis of the entire skin appeared molded polyurethane foam, not only reduce but do not even have vinyl skin material, which greatly simplified the production process. At the same time also developed a high rebound and cold cure foam, not only to improve the resilience of the bubble,Discount UGG boots, providing a more comfortable cushion material, and reducing manufacturing costs and energy consumption, improving products molding and feel. Foam in the block also has a great breakthrough in technology, in order to reduce the massive bubble production side of the skin loss, in the 20th century 60s Unifoam method developed based on the flat foam technology Foamax law.

the 21st century, to protect the ozone layer, CFC-11 and dichloromethane disabled. Italy Cannon Group and Bayer Group Hennecke GmbH, Germany have developed a liquid CO2 foaming technology, and the corresponding call ; Cannon ViKing developed plant forced cooling foam (Rapidcure) and crafts. In the new varieties, there are fire-retardant foam, super soft foam, low density and high resilience foam, foam lipophilic, hydrophilic foam and foam products, such as mesh, in recent years, they have appeared low fogging, low heat distortion foam, high resilience foam (rebound rate of ≥ 70% or more), low smoke, high flame-retardant high resilience foam, and so on. These new techniques and new varieties of success greatly promoted the development of soft polyurethane foam.

Second,UGG boots cheap, rigid polyurethane foam

Overview

rigid polyurethane foam is under a certain load without obvious deformation, deformation occurs when the load is too large can not be restored to its original state after the foam. It is an excellent insulation and structural materials, various types of polyurethane products, the production after the soft foam.

20 century and the early 40s. Theoretical basis on polyurethane chemistry of rigid polyurethane foam used as a starting small-scale structure of the aircraft sandwich core material. 40 years of the 20th century scribe, with toluene diisocyanate (TDl) of industrial production,UGG shoes, TDI and polyol rigid polyurethane foam as the basic raw materials. One-step production initially, but this is difficult to control the foaming process of heat release staff. So most of the two-step (prepolymer) shape.