摘要:
The invention concerns a method for the preparation of aerogels by the sub-critical drying of inorganic or organic hydrogels or lyogels, the invention using dielectric drying techniques.
摘要:
This invention provides an improved process for producing a superabsorbent polymer with reduced residual monomer content which comprises partially drying a crosslinked, partially neutralized polymer gel, then raising the temperature of the gel using microwave radiation in the absence of circulating air and thereafter completing the drying.
摘要:
A simplified method of manufacturing a silicone elastomeric foam comprises mechanically generating a stable froth of an aqueous emulsion while adding surfactant and thickener, then exposing the stable froth to microwave energy to remove the water. The emulsion consists essentially of anionically stabilized hydroxyl endblocked polydiorganosiloxane, colloidal siiica, an organic tin compound, and water, having a pH in the range of 9 to 11.5 inclusive. The dried froth is an elastomeric, cellular structure possessing typical silicone elastomer heat stability and long-term aging stability.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von Dichtungsringen aus Blähgraphit, bei dem ein poröser Dichtungsring vorbestimmter Anfangsdichte hergestellt, mit einer PTFE-Dispersion getränkt, danach getrocknet und anschließend zur gewünschten Enddichte komprimiert wird, wobei während des Tränkens mit der PTFE-Dispersion deren PTFE-Teilchen mittels eines elektrisches Feldes zum Dichtungsring bewegt werden.