Summary of various methods to improve the hardness of polyurethane rigid foam

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

1, the 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.

2、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.

3、Increase the amount of catalyst or add other kinds of catalyst or modified reagent There are some such catalysts.

① Increase the content of POP, within 80% are available.

② Try to add some modified MDI appropriately.

③ Add some polyester to the 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 triple catalyst, and increase the proportion of black and white material.

4、Increase the density of raw materials

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

5、Appropriately use a little hole-opening agent

6、Increase the volume of foam

7、Adding powder can also increase the hardness