The invention relates to an interface agent for a high-speed railway ballastless track
polyurethane caulking material and a preparation method thereof. The interface agent comprises the following raw materials in parts by weight: 100 parts of
isocyanate prepolymers, 80-120 parts of solvents, 0.1-0.5 part of catalysts, 0.5-2.5 parts of water removal agents and 0.5-2.5 parts of anti-aging agents. The preparation method comprises the following two steps of: (1) slowly dripping polyhydric
alcohol to
isocyanate at the temperature of (85+ / -5) DEG C, then increasing the temperature to (90+ / -5) DEG C for
continuous reaction, when the content of NCO groups is 14%-16%, adding organic
silicon coupling agents, and reacting till the content of the NCO groups is 10%-12% so as to obtain a
prepolymer; (2) adding the solvents, the catalysts, the water removal agents and the anti-aging agents to the
prepolymer, uniformly stirring, and debubbling in vacuum (at vacuum degree less than or equal to -0.09MPa) to obtain the interface agent for the
polyurethane caulking material. The interface agent disclosed by the invention has the characteristics of low
viscosity, good impregnation property, high
toughness, excellent
hydrolysis-resistant property and alkali-resistant property, excellent
adhesive property with concrete and the
polyurethane caulking material, and the like.