Preparation of Silicone Modified Waterborne UV-Curing Polyurethane Emulsion with Sulfonate
A silicone-modified sulfonated waterborne polyurethane acrylate(SWPUA)emulsion with different sulfonate groups,silicone and R values(mole ratio of isocyanate to hydroxyl)was prepared by the three sulfonate polyester diols(i.e.BY-3303,BY-3305 and BY-3306)as sulfonated soft segment,hydroxysilicone oil PMX0156 as silicone soft segment,isoferone diisocyanate(IPDI)as hard segment,and 1,4-butanediol(BDO)as chain extender.The influence of value R,sulfonate and silicone on the appearance,particle size,storage stability and thermal storage stability of SWPUA emulsion were explored,as well as the hardness,adhesion,water absorption,water contact angle and mechanical strength of the UV-cured SWPUA film were also studied.It was confirmed by FIIR and 1 H NMR that SWPUA was successfully synthesized by amine esterification.When BY-3303 was selected as sulfonate polyester diol,and the mole ratio of BY-3303,PMX0156 and BDO was 1.5∶0.3∶1.0,value R was 1.3,the prepared SWPUA was a milky pan-blue emulsion,with solid content of 40wt%,low viscosity and particle size,i.e.,viscosity(No.4 Cup)of 96 s,a particle size of 312 nm,and good storage stability and thermal storage stability.Under this condition,SWPUA coating film has good comprehensive performance,with a hardness of 1H,adhesion of grade 4B,water con-tact angle of 93.2°,water absorption of 2.43%,tensile strength of 8.14 MPa,and elongation at break of 327.47%.SWPUA can also be quickly crosslinked in 30 s,and the silicone chain segments can overcome the oxygen inhibition and improve the double bond conversion rate up to 93%.
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