Special silane paste protective agent for concrete and preparation method thereof

The invention discloses a special silane paste protective agent for concrete and a preparation method thereof. The silane paste protective agent is prepared by taking long-chain-alkyl silane coupling agent with the length of the carbon chain between 4-16, siloxane oligomer with the viscosity between 10 and 2, 000mm2/S, organic solvent, emulsifier and deionized water as raw materials, the preparation temperature is 1-40 DEG C, the mixing speed is 1, 500rpm-2, 000rpm, the deionized water and 2%-80% of the emulsifier are uniformly mixed to obtain aqueous phase, then the silane coupling agent, the residual emulsifier, the siloxane oligomer and the organic solvent are uniformly mixed to obtain oil phase, and finally the oil phase is dropped in the aqueous phase while mixing for continuous mixing under 2, 500rpm after completion of the oil phase dropping till the material in a reactor turns to viscous paste. The product of the invention has advanced technology, economy and reasonableness, safety and durability, reliable quality and convenient construction, can obviously improve the durability of the concrete structure and can be widely applied in protecting various concrete structures.