聚氨酯发泡剂（Polyurethane foaming agent）.docVIP

聚氨酯发泡剂（Polyurethane foaming agent） Polyurethane foam agent.Txt there are three kinds of people in the world: one is conscience eaten by dogs, two is conscience not eaten by dogs, and three is conscience, even dogs do not eat people. ), love is a dream, but I have overslept this contributed by sylei668. DOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Used as a foaming agent of microcellular foam plastics production, general physical and chemical type can be divided into two types, this is according to the gas production is the physical process (i.e. evaporation or sublimation), or chemical process (i.e. chemical damage or other chemical reaction to the division). (1) the physical foaming agent is a low boiling liquid or gas that can be dissolved in the polymer matrix. When the temperature of the system is increased and (or) the pressure of the system is lowered, the physical foaming agent is boiled so as to exert their foaming action. The chemical properties and deformation properties of the polymer system determine the type of hair holding agent that can be used. (2) chemical foaming agents in chemical materials, such as polyurethane, phenolic plastics and amino plastics, are often formed by chain growth and cross-linking reactions in thermal materials. On the contrary, for thermoplastics, chemical hair with compatible or have very fine dispersion of chemical substances in higher polymer ingredients temperature, but the processing temperature range is very narrow temperature range, according to the requirements of the decomposition rate of completion. The most important chemical foaming agent used in industry is the compound that releases nitrogen as the main gas phase. In addition, the decomposition reaction can sometimes be catalyzed or inhibited, so that in a prescribed formulation, the rate of foaming can be adjusted to suit the particular processing condition