What are the classifications of foam raw materials?

1. Epoxy resin whose raw material value of bisphenol A epoxy foam is 0.51～0.22mol/100g is mainly used as epoxy resin. The viscosity is 20Pa·s at 25°C; the viscosity is 1Pa·s at 130°C.

2. Curing agent Foam raw materials can choose various curing agents of epoxy resin. 3. Foaming agent Epoxy resin foaming agent includes physical foaming agent and chemical foaming agent. Physical blowing agents are mainly low-boiling liquids, such as trichlorofluoromethane (F11), trichlorotrifluoroethane (F112), dichlorodifluoromethane (F12), etc. The heat of curing the epoxy resin is used to vaporize the low-boiling liquid, releasing gas and foam, resulting in a product of low density and low thermal conductivity. However, fluorocarbons have damaging effects on the atmosphere and are commonly used in spray foaming processes. According to experts from the China Epoxy Resin Industry Association, toluene can be used as an auxiliary blowing agent. In addition to foaming, it acts as a heat absorber and diluent for the curing reaction. Chemical foaming agents are mainly azo organic compounds, such as azodicarbonamide (ADCA or AC), 2,2′-azobisisonitrile (AIBN), diazoaminobenzene (DAB), etc. This blowing agent is cheap, and the decomposition products are odorless and colorless. In addition, there are sulfonyl hydrazides such as 4,4′-oxobisulphonyl hydrazide (OBSH). Pay attention to the decomposition temperature when choosing. The properties of commonly used chemical blowing agents azodicarbonamide (AC, ADCA) are introduced. Orange yellow crystalline powder. Decomposition above 120°C produces a large amount of gas (N2, CO and a small amount of CO2). The amount of gas produced under standard conditions is 200~300mL/g, and it is a high-efficiency blowing agent.