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Sponge application

07 . Jun . 2024

Clear formation mechanism of slow rebound sponge, can be based on customer needs, design a reasonable formula. For example, the customer requires the sponge rebound speed to be fast, appropriate to reduce the amount of slow rebound polyether, increase the amount of ordinary polyether; The customer requires that the sponge hardness should be high. It can be satisfied by increasing the amount of slow rebound polyether, replacing part of ordinary polyether with white oil, and improving the TDI index.

 

 

The problem that slow rebound sponge is easy to obturator can also be solved according to the formation mechanism of slow rebound sponge. Generally, the higher the sponge density, the easier to obturator; The higher the TDI index, the easier it is to obturate foramen.

 

 

In the production of high-density slow rebound sponges, polyether with molecular weight of 550 and hydroxyl value of 306 is mostly used. At this time, the crosslinking density increases, chain segment winding and packing are tight, the degree of phase separation is light, and hard segment is the dominant factor. Similarly, at a high TDI index, the cross-linking density increases, the hard segment becomes more concentrated, and the obturator tendency increases. The problem can be solved by increasing the amount of opening agent.

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