Moistureproof precoated sand and preparation method thereof

The invention provides damp-proof precoated sand and a preparation method thereof, and belongs to the technical field of precoated sand preparation. The damp-proof precoated sand is composed of silica sand, phenolic resin accounting for 1%-3% of the mass of the silica sand, a curing agent accounting for 12%-15% of the mass of the phenolic resin, a lubricating agent accounting for 0.1%-0.2% of the mass of the silica sand and a damp-proof agent accounting for 0.2%-0.3% of the mass of the silica sand. The moisture-proof agent is prepared from dry alkyd resin, isobutyl triethoxy silane, a flame retardant and hexadecyl trimethoxy silane. The moisture-proof precoated sand not only can prevent the precoated sand from absorbing water and caking, but also can improve the strength and melting point of the precoated sand. 本发明提供一种防潮覆膜砂及其制备方法，属于覆膜砂制备技术领域。该防潮覆膜砂由以下组分组成：硅砂，占所述硅砂质量1％～3％的酚醛树脂，占所述酚醛树脂质量12％～15％的固化剂，占所述硅砂质量0.1％～0.2％的润滑剂，占所述硅砂质量0.2％～0.3％的防潮剂；所述防潮剂由干性醇酸树脂、异丁基三乙氧基硅烷、阻燃剂、十六烷基三甲氧基硅烷组成。该防潮覆膜砂不仅能够防止覆膜砂吸水和结块，还能提高覆膜砂的强度和