How to make foam sponge

Sponge is a kind of polyurethane foam which belongs to flexible polyurethane foam. Because of the porous honeycomb structure, it has the characteristics of excellent softness, elasticity, water absorption and water resistance and is widely used in sofas, mattresses, clothing, flexible packaging and other industries.

Sponge foaming has the following five steps:

1. Nucleation reaction: Simply put, it is a kind of nucleus formed by silicone oil evenly dissolving the components together, which plays an intermediary role in it.

2. Milky white reaction: It is a process of increasing the thickness under the catalysis of various small materials.

3. Foaming reaction: The heat and gas generated by the reaction of TD and water after the material consistency increases continuously, so that the material opens and foams and the volume increases.

4. Gel reaction: when the temperature of the foam reaches a certain level, the two main ingredients will gradually open to gel under the action of T9. true post-aging reaction stage