| abstract |
A composite blowing agent comprising: 1) hexafluorobutene; and 2) an alkanolamine salt mixture (MAA) comprising an organic amine salt having the following general formula (I) Compound: An- [B m+ ] p (I); wherein An- is one or two or three selected from the following anions: (b) carbonate: CO 3 2- ; (c) formic acid Root: HCOO‑ ; (d) bicarbonate: HO ‑ COO‑. The composite foaming agent is suitable as a polyurethane foaming agent, and the obtained polyurethane foam material has good thermal insulation properties and cryogenic thermal insulation properties, as well as good dimensional stability. |