Non-fluoro hydrophobic aqueous-based polyurethane resin dispersion

Abstract

The present invention provides a cross-linking non-fluoro hydrophobic aqueous polyurethane dispersion, which is produced by selecting a compound comprising alcohols, amines, acids, saturated or unsaturated (double-bonded or epoxidized) aliphatic long chain carbon-carbon groups or polydimethylsiloxane comprising alcohol groups, amines, oxosilane to be reacted with IPDI to obtain a PU prepolymer; adding a compound having tertiary amines to neutralize the carboxylic acid of PU prepolymer and adding water to disperse the PU prepolymer; and adding a ambient temperature cross-linking agent to obtain a cross-linking hydrophobic aqueous PU dispersion of the present invention. The hydrophobic aqueous-based PU resin has no fluorine which is friendly to the environment, and may further self cross-links on its applications on fabric, paper, wood, glass and metal surfaces, respectively on drying at ambient temperature which is energy saving process. Its cross-linking reaction of this hydrophobic PU system that will achieve a long-lasting water repellent surface treatment.

1 . A non-fluoro hydrophobic aqueous polyurethane dispersion, which is produced by a method comprises the following steps:
 selecting a compound comprising alcohols, amines, carboxylic acids, saturated or double-bonded or epoxidized aliphatic groups or polydimethylsiloxane comprising alcohol groups, amino groups, oxosilane to be reacted with polyisocyante to obtain a polyurethane prepolymer having isocynate (NCO) terminal group;   adding a compound having hydrophilic functional groups into the polyurethane prepolymer having isocyanate terminal groups, after neutralizing, adding water to disperse the polyurethane prepolymer to form an aqueous polyurethane dispersion; and   adding a room-temperature cross-linking agent into the aqueous polyurethane dispersion to obtain a self-crosslinked aqueous polyurethane dispersion.   
     
     
         2 . The aqueous polyurethane dispersion according to  claim 1 , wherein the polyurethane-dispersion can be made into single-liquid form.