In the foaming process, if the hardness of the rigid foam is not enough, how to improve the hardness? In this regard, I have collected some solutions for your reference. 1. Low cost preferred, adding calcium carbonate Add 20% calcium carbonate, more than 500 mesh. This method will not have a great impact on the performance index, mainly because of its low cost. 2. Increase index Increase the TDI index properly, increase the water volume, and reduce the MC consumption accordingly, so as to improve the hardness properly. 3. Increase the amount of catalyst or other kinds of catalyst or modified reagent There are some catalysts: 4. Increase the density of raw materials That is to say, when foaming, adjust the foaming ratio properly, reduce the foaming ratio and increase the density.
② Add some modified MDI appropriately;
③ Adding polyester to polyether;
④ Adding some rigid foam polyether, the polyether with higher functionality may be more effective;
⑤ Increase the proportion of 405, 403, etc;
⑥ Add trimerization catalyst and increase the proportion of black and white materials.
6, increase the capacity of foam.
7. Adding powder can also increase hardness
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