Optimization of Exothermic, Foaming, and Mechanical Properties of Modified Polyurethane as Filling Material for Goaf Sealing Wall

Table 3

Proportioning schemes of component B.

Group of specimens	Number of specimens	Mass ratio of raw materials in component B
		Polyether polyols a : b	Catalysts	Surfactants	Chain extenders	Plasticizers
Group I	1	9 : 11	0.5	0.5
	2	9 : 11	0.8	0.6
	3	9 : 11	1.0	0.7
	4	9 : 11	1.2	0.8
Group II	5	10 : 10	0.5	0.6	1.2	6
	6	10 : 10	0.8	0.5
	7	10 : 10	1.0	0.8
	8	10 : 10	1.2	0.7
Group III	9	11 : 9	0.5	0.7
	10	11 : 9	0.8	0.8
	11	11 : 9	1.0	0.5
	12	11 : 9	1.2	0.6
Group IV	13	8 : 12	0.5	0.8
	14	8 : 12	0.8	0.7
	15	8 : 12	1.0	0.6
	16	8 : 12	1.2	0.5