What are the main raw materials included in the sponge?

In life we will come into contact with a lot of packaging lining, cellulose sponge manufacturerI believe that we are no strangers to the sponge, the use of sponge has been applied to people's lives in the field, people for the sponge some of the raw materials are listed to know some of them, but people for the sponge's main raw materials are not very clear,  then for this problem next for everyone to explain the sponge's main raw materials is what?

Sponge is a kind of polyurethane foam, wholesale Konjac spongebut also a kind of flexible polyurethane foam. Because of its porous cellular structure, sponge has excellent flexibility, water absorption, elasticity and water resistance. natural luffa spongeIt is because of these characteristics that it can be widely used in sofas, garments, mattresses, soft packaging and other industries.

The main raw materials of sponge are as follows.

1. organic isocyanate: commonly used toluene diisocyanate (TDI), there are two isomers, namely, 4-TDI and 6-TDI. 4-TDI sponge production accounted for 80%, 6-TDI accounted for 20%.

2, polyether polyol: sponge is mostly used through the polyether propylene glycol, polyether propylene glycol, its functionality is less (2-3), low hydroxyl value, molecular workload. Molecular formula: CH3-CHO (C3H6O) m (C2H4O) nH CH2O (C3H6O) m (C2H4O) nH.

Catalyst: It can promote polyether polyol and isocyanate reaction chain growth catalyst is tin (II) 2-ethyl hexanoate, dibutyltin. Catalysts that promote the reaction cross-linking of isocyanate with water and release of CO2 gas include triethanolamine, triethylenediamine, triethylamine and so on.

4. Foam stabilizer (foam homogenizer): commonly used silicone foam stabilizer, mainly silicon-carbon bond Si-C copolymer, the dosage of about 0.5%-5%.

Topical foaming agent: Commonly used are fluorocarbons with low boiling point, such as fluorotrichloromethane (F-11). Because it is not environmentally friendly, F-11, or methylene chloride, is often replaced by cyclopentane, which works well.

6. Water:Water is essential in the production of sponges. Water reacts with TDI to release CO2 gas, while acting as a chain grower.

sponge excellent flexibility water absorption

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