摘要:
Rigid polyurethane foams are prepared from an isocyanate composition containing diphenylmethane diisocyanate, three ring oligomers of polyphenylene polymethylene polyisocyanate and higher homologues of polyphenylene polymethylene polyisocyanate.
摘要:
Polyisocyanate-prepolymer based adhesives for the preparation of adhesive bonded lignocellulosic composite articles are provided. The adhesives comprise the reaction products of a polyisocyanate composition, an amine initiated polyahl, and a hydrocarbon backbone polyahl, wherein the adhesive composition contains free organically bound isocyanate groups. Further provided is a process for using the adhesives and lignocellulosic composite articles produced therewith.
摘要:
This invention concerns a process for the manufacture of a press molded material, comprising applying diisocyanate, polyol, and catalyst to a wood material, wherein the catalyst is a tertiary amine-carboxylic acid salt that is blocked at room temperature and becomes unblocked at an elevated temperature, and heating the resulting mixture to a temperature effective to unblock the salt to produce unblocked tertiary amine. The press molded material can be an orientated strand board (OSB).
摘要:
Rigid polyurethane foams are prepared from an isocyanate composition containing diphenylmethane diisocyanate, three ring oligomers of polyphenylene polymethylene polyisocyanate and higher homologues of polyphenylene polymethylene polyisocyanate.
摘要:
Rigid polyurethane foams are prepared from an isocyanate composition containing diphenylmethane diisocyanate, three ring oligomers of polyphenylene polymethylene polyisocyanate and higher homologues of polyphenylene polymethylene polyisocyanate.