A catalyst for curing epoxy resins comprises a tetraalkylphosphonium tetrafluoroborate represented by Formula (1):
1
wherein R
1
, R
2
, R
3
, and R
4
are each C1-C5 linear or branched alkyl and may be the same or different, and the halogen ion content in the tetraalkylphosphonium tetrafluoroborate is 20 ppm or less. An epoxy resin powder coating composition containing this catalyst exhibits a prolonged pot life and can be baked at decreased temperatures.
一种用于固化环氧
树脂的催化剂,包括公式(1)所表示的四烷基
氟硼酸盐,其中R1、R2、R3和R4均为C1-C5的线性或支链烷基,可以相同也可以不同,四烷基
氟硼酸盐中的卤素离子含量为20 ppm或更低。含有该催化剂的环氧
树脂粉末涂料组合物具有较长的搅拌寿命,并且可以在较低温度下烘烤。