摘要:
A method for making flexible polyurethane foam in which a polyisocyanate is reacted with a polyol in the presence of a urethane catalyst, a blowing agent, optionally a silicone surfactant cell stabilizer, and a cell opening additive. The cell opening additive comprises an active methylene or methine compound which also contains a tertiary amine. Preferred cell opening additives are 2-cyano-N-[3-(dimethylamino)-propyl]acetamide and (NC)CH 2 C(O)OCH 2 CH 2 N(CH 3 )CH 2 CH 2 OCH 2 CH 2 N(CH 3 ) 2 .
摘要:
The present invention is directed to a rigid, lightweight filled resin foam having voids dispersed in a continuous phase which is formed from a polyester hybrid resin having reinforcing particles dispersed therein. The hybrid resin forms a complex cross-linked network (20) which may interact with other polymer networks in the continuous phase either by cross-linking or by forming an interpenetrating polymer network. The present invention is also directed to a process for preparing the above rigid, lightweight resin foam, and to a composition for use in this process. The foam of the present invention is useful in building materials and the like requiring high tensile and compressive strength and corrosion and thermal resistance.
摘要:
A co-polymer composition (28) for coating porous structural material (21) includes a compatible surfactant resulting in a structural inter-bonding between the coating composition (28) and the structural material (21). The co-polymer composition (28) cured in a layer of unsupported foam has sufficient strength to be used as a substitute for comparably or larger sized layers of re-enforced concrete for conducting fluids while resisting compressive loads. A co-polymer foam composition (28) for coating structural material (28) cures to have an atmosphere-facing surface that is substantially impervious to corrosive substance penetration.
摘要:
A method for removing free diisocyanate from a polyurethane foam production line comprising introducing steam into the production line at at least one point where the free toluene diisocyanate is present.