Room temperature curing polyurethane encapsulants and preparation method

The present invention discloses a room temperature curing polyurethane encapsulants and its preparation method, the hydroxyl-containing component of the present invention partitioned between the two components, and by preparing the chain extender complex terminal hydroxyl polybutadiene-based polyurethane potting material, the chain extender is ethylene glycol, diethylene glycol, 1,2-propanediol, 1,4-butanediol, 1,6-hexanediol, trimethylol propane, 3,5-bis two kinds methylthio toluene diamine, N, N'- bis (2-hydroxypropyl) aniline, 2,4-diamino-3,5-dimethyl-chlorophenyl group and the like or a mixture of more , a tensile strength of at least 14MPa, and salt spray and humid environments, to maintain high mechanical properties. The method of the present invention adopts semi-prepolymer process, so that the two components are similar viscosity, easier mixing, the preparation process is simple, rapid prototyping, flow, and less product surface pores.