Abstract:

Organosilixane prepolymer derived from methyltriethoxylsilane was synthesized, and characterized by IR and 1H NMR. The hydrolysis and condensation of the methyltriethoxylsilane were carried out in the presence of a catalytic amount of hydrochloric acid. Using 0.60% NaOH.CH3OH solution as curing agent, the curing performance of the prepolymer at various temperature was investigated. The curing time was 9 min at 30 ℃, and 4 min at 50 ℃, when 0.05 mL 0.60%NaOH-CH3OH was added to prepolymer-industrial ethanol solution with the volume ratio of the prepolymer to industrial ethanol at 1∶1. The mixture of organosilixane prepolymer and polyvinyl alcohol(PVA) was used as chemical sand-fixing material for the first time. The crust, which was formed by using this material, had good water resistance, ageing resistance(under 16 h ultraviolet irradiation), and shear strength value. The cohesion value was 483.7 kPa, and the angle of internal friction was 68.39°, when the mass ratio of polyvinyl ethanol to organosilixane prepolymer was 1∶4.

Key words: methyl triethoxysilane, organosilixane prepolymer, polyvinyl alcohol, room-temperature curing, chemical sand-fixing agent