Experimental Study on Reducing the Heat of Curing Reaction of Polyurethane Polymer Grouting Material

Table 6

Proportions of low exothermic polymer grouting material (%).

White material	Component	Pre 1	Pre 2	Pre 3	Flame retardant	High-boiling point solvent	Surface active agent	Tertiary amine catalyst	Organotin catalysts	H2O	HCFC-141b
	Weight proportion (%)	10.16	43.96	5.28	18	15	1	0.2	0.3	0.1	6
Black material	Component	Prepolymer 3 (NOC of 16.6%)		Polyphenyl polymethylene isocyanate					High-boiling point solvent
	Weight proportion (%)	45		50					5