| 摘要 |
Moulded polyurethane elastomers are prepared by reacting in solution an isocyanate modified polyhydroxy compound of MW 1000-6000 and containing terminal -NCO groups with a chain lengthening agent of Formula (I) <FORM:1102352/C3/1> in which R, R1 and R2 can each be a hydrogen atom or an alkyl, cycloalkyl, aryl or aralkyl radical having up to 8C, R3 is a divalent linear or branched aliphatic, aromatic or araliphatic hydrocarbon radical having up to 10C in a continuous chain which may be interrupted by hetero atoms; R4 is the radical <FORM:1102352/C3/2> where A is a hydrogen atom, an alkyl, cycloalkyl, aryl or aralkyl radical and B is an organic radical containing at least one sulphone group and which may be connected with A, and n is 0 or 1; and shaping whilst removing the solvent e.g. by casting on to a plate. The polyhydroxy compound may be a polyether, polythioether, polyesteramide or polyacetal. The isocyanate may be aliphatic, cycloaliphatic or aromatic. The solvent may be a polar organic solvent e.g. dimethyformamide, dimethyl acetamide, tetramethyl urea or tetramethylene sulphone.ALSO:In Example (1) 2,4-dihydrazino-6-[N-ethyl-N-thiacyclopentyl - 1,1 - dioxide - amino - s - triazine] is prepared by reacting cyanuryl chloride with ethylene thiacyclopentane 1,1-dioxide amine and adding hydrazine hydrate. The product is recrystallized from a 1:1 mixture of dimethyl formamide and water. In Example (2) 2,4 - dihydrazino - 6 - [tetrahydro - 1,4 - thiazino-1,1 - dioxide] - s - triazine is prepared by reacting cyanuryl chloride with tetrahydro-1,4-thiazine -1,1-dioxide and adding hydrazine, followed by recrystallization from dimethyl formamide/water mixture. |
