Fracture Characteristics of Polyurethane Grouting Materials Based on Acoustic Emission Monitoring

Table 2

Type of raw materials.

Raw materials	Type	Dosage range (g)	Specification
PAPI	PM-100	18.0 –25.0	Chemically pure
MDI (MDI)	PMM-20	3.0 –6.0	Chemically pure
Polyether triols	GP-306	15.0 –25.0	Chemically pure
Polyether tetraols	HK-4110 G	15.0 –25.0	Chemically pure
Catalysts	A33	0.5 –1.2	Chemically pure
Surfactants	BL-8468	0.5 –0.8	Chemically pure
Chain extenders	DEG	1.2	Analytically reagent
Plasticizers	DOP	6.0	Analytically reagent