In order to develop a new type of superhydrophobic finishing agent, silicon sol was prepared by sol-gel method using methyltrimethoxysilane (MTMS) as raw material. It was then modified by synthetic polymers prepared from lauryl acrylate (LA), acrylonitrile (AN) and 3-methacryloxypropyltrimethoxysilane (KH 570). Finally polyacrylate modified silicon sol (PLAKS) was successfully obtained, and was applied to super hydrophobic finishing of polyester fabrics. The structure of the PLAKS and application performance were investigated by Fourier transform infrared spectrum( FT-IR) , atomic force microscope(AFM) and contact angle meter, respectively. The results show that PLAKS is obtained when mass ratio of LA to AN to KH570 is 20：10：0.6, the amount of MTMS is 20 % (in terms of the whole mass of LA, AN and KH570), ammonia (with the mass content of 25%) is 12 %(in terms of the whole mass of LA, AN and KH570, and the treated fabric surface achieveds superhydrophobicity. The water contact angle of the treated fabric is 151.3° , the hydrophobic rating is 100, and the hydrostatic pressure resistance rating is 5.After washing for 15cycles, the water contact angle of the fabric is 134.4°, the hydrophobic rating is 90, and the hydrostatic pressure resistance rating is 4. It is indicated that the hydrophobicity of PLAKS treated fabric is washable.
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