What is the synthesis principle of polyurethane sponge

At present, sponge production mostly adopts one-step box foaming method, mixing all kinds of raw materials at high speed and adding them into the molding box quickly to complete the chain growth of the molding box, foaming, crosslinking and curing to complete the sponge production.Konjac sponge company The process is short, low material viscosity, easy to control, energy saving, low investment in equipment and wide density range. Sponge is a kind of dry and soft polyurethane foam. Due to the structure of porous honeycomb, it has excellent flexibility. Water absorption and waterproof characteristics, widely used in sofas, mattresses, clothing, soft packaging and other industries.

Polyurethane foam

1.Main raw materials

Polyether polyol

Most sponges use low functionality (2-3), low hydroxyl value, high molecular weight polyether propylene glycol and polyether propylene glycol.

2. Water is essential in the production of sponges. The reaction of water with aqueous TDI releases CO2 gas and also acts as a chain growth agent.

3.Catalyst

Stannous octanoate and dibutyltin are catalysts that promote the reaction using polyether poly more alcohol and isocyanate. Promoting the role of crosslinking can be reacted to promote the use of isocyanate and water reaction between CO]2 Triethanolamine is a catalyst for gas .karesponge Triethylene diamine . Triethylamine etc.

5. External foaming agent

Usually used for low boiling point fluorocarbons such as monofluorotrichloromethane (F-11). Cyclopentane is usually used instead of cyclopentane. e-11, or dichloromethane, works well. If you do not produce a very light density sponge,bulk sponges for cheap you can also adjust the ratio of the main raw materials and do not use an exogenous agent.

6. The principle of sponge synthesis

In the synthesis process of sponge, there are mainly chain growth reaction, foaming and cross-linking process, and these reactions are related to the molecular structure, functionality and molecular weight of raw materials.

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