Polyurethane foam – various methods to improve the hardness of hard foam

In the process of foaming, if the hardness of the hard foam is not enough, how to improve the hardness? In this regard, I have collected some solutions that

01 lower cost preferred, add calcium carbonate

Add 20% of calcium carbonate, 500 mesh or more. Such a method will not have much impact on the performance index, mainly because of the low cost.

02 Increase the index

Properly increase the TDI index, increase the amount of water, while correspondingly reducing the amount of MC, which can also properly improve the hardness.

03 Increase the amount of catalyst

Or add other kinds of catalysts or modification reagents

There are some such catalysts.

① Increase the content of POP, anything within 80% is fine.

② Try to add some modified MDI appropriately.

③ Add some polyester to polyether.

④ Add some hard foam polyether, choosing a polyether with large functionalities may work a little better.

⑤ Increase the proportion of hard foam expanding and cross-linking agents such as 405 and 403.

⑥ Add trimer catalyst and increase the ratio of black and white material.

04 Increase the density of raw materials

That is, when foaming, appropriate debugging foaming ratio, reduce the foaming multiplier, improve the density.

05 Appropriate use of a bit of opening agent

06 Increase the volume of foam

07 Adding powder can also increase the hardness