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

Table 5

Results of expansion ratio.

No.	Factors				Index
		Mass ratio of polyether polyols a : b	Catalyst A33	Surfactant BL-8468	Expansion ratio
1		9 : 11	0.5	0.5	2.9
2		9 : 11	0.8	0.6	3.5
3		9 : 11	1.0	0.7	1.5
4		9 : 11	1.2	0.8	1.3
5		10 : 10	0.5	0.6	2.0
6		10 : 10	0.8	0.5	2.2
7		10 : 10	1.0	0.8	1.3
8		10 : 10	1.2	0.7	1.4
9		11 : 9	0.5	0.7	2.1
10		11 : 9	0.8	0.8	1.9
11		11 : 9	1.0	0.5	2.6
12		11 : 9	1.2	0.6	2.6
13		8 : 12	0.5	0.8	1.5
14		8 : 12	0.8	0.7	2.1
15		8 : 12	1.0	0.6	2.2
16		8 : 12	1.2	0.5	3.3
Expansion ration		2.300	2.275	2.750
		1.725	2.400	2.300
		2.025	1.900	1.750
		2.400	1.875	1.650
		0.675	0.525	1.100