Effects of Foaming and Drainage Behavior on Structure and Properties of Polyurethane/Water Glass (PU/WG) Grouting Materials for Coal Mines

Table 1

Compositions of the PU/WG grouting materials.

	Composition	Amount (g)	Main property
Component A	WG	100	Modulus: 2.6 Baume degree (20°C): 49.5 ± 0.5
	Glycerin	1.5	—
	Catalyst	0–1	—
Component B	PM200	90	NCO content (%): 30.5–32.0
	DL-2000D	10	Hydroxyl value (mg KOH/g): 54.5–57.5
	DOP	21	—