Are there any blowing agents for preparation of polymer foams?
Depending on your application, e.g. food due to risk of ethylcarbamate formation, you may look for alternatives.
https://books.google.nl/books?id=qJwX5gqcbf0C&pg=PA288&lpg=PA288&dq=azodicarbonamide+blowing+agent+alternatives&source=bl&ots=vlG8PG2A7M&sig=ioma7M0ulsQqPuw_6KeSj2GO5oI&hl=en&sa=X&ved=0ahUKEwjZ7Migwp_JAhXEYg8KHSx1AXAQ6AEINzAF#v=onepage&q=azodicarbonamide%20blowing%20agent%20alternatives&f=false
Reports on such risks concerning azodicarbonamide you may find on ECHA, any a very interesting site for finding information on HSE/registration aspects et al:
http://www.echa.europa.eu/documents/10162/d9e11c88-481a-47a9-8fff-915b48086ddb
This reports also discusses the alternatives.
Searching on ECHA:
http://www.echa.europa.eu/
I was also looking up aluminum hydroxide, as it is used as a flame retardant in some applications (due to release of water and formation of alumina in the process). I found an interesting article that lists in its Table 1, several potential flame retardants (which also presumably releases water and/or CO2). The two that were in your range were:
Mineral Chemical # Formula # Approx. Decomp. T
Hydromagnesite # Mg5(CO3)4(OH)2·4H2O # 220–240 °C
Dawsonite # NaAl(OH)2CO3 # 240–260 °C
http://www.sciencedirect.com/science/article/pii/S0141391010003526
Hello Mr. Vladimirov
some organic molecules like polyoxazolidinone (processed from BADGE epoxies and MDI isocyanurate in the presence of 2-Phenylimidazol) decarboxylize at 320-380°C, futher commercial products for this application (esp. electrical insulation) would be araliphytic biuret or carbamate. Manufacturer of intumescent coating use often PU-based raw materials. But it is certainly not easy to receive a well-defined porous polymide foam. Best regards, Ralf Recknagel
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