New additives for retarding setting of cement from methylenephosphonated aminohydrocarbylpiperazine-urea adducts
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0136790A2
公开(公告)日:1985-04-10
Certain methylene phosphonic acid derivatives of aminohydrocarbyl piperazine-urea adducts are good cement retarders. The adducts have the formula
wherein A is
or X; X is -
or H;
R is H, ammonium, an alkali or alkaline earth metal;
m is 0-2;
n is 2 or 3; and
wherein at least one X is:-
氨基氢羰基哌嗪-脲加合物的某些亚甲基膦酸衍生物是良好的水泥缓凝剂。这些加合物的化学式为
其中 A 是
或 X
或 H;
R 是 H、铵、碱金属或碱土金属
m 是 0-2
n 是 2 或 3;以及
其中至少一个 X 是