Patent ID: 9688879
Date: 2017-06-27
CPC Classifications: C08G,C08K,C09D,D06M

Claim:
1. A production method of non-fluoro hydrophobic aqueous polyurethane dispersion, which comprises the following steps: mixing and reacting a first compound comprising polydimethylsiloxane and higher alcohol or diols having carbon numbers from 10 to 30 and a second compound having hydrophilic functional groups with a polyisocyanate to obtain a polyurethane prepolymer having at least two isocyanate (NCO) terminal groups, so that hydrophobicity of final polyurethane resins is adjustable by regulating a ratio of the polydimethylsiloxane and the higher alcohol or diols to form a hybridized polyurethane resin; neutralizing the polyurethane prepolymer, then adding water to disperse the polyurethane prepolymer to form an aqueous polyurethane dispersion which are compatible in any ratios; and adding a latent cross-linking agent into a mixture of aqueous polyurethane dispersion to make the aqueous polyurethane dispersion self-crosslinkable.