Preparation of Acrylate Oligomer and Its Application in the Modification of Waterborne Polyurethane
The modified waterborne polyurethane (WPU) emulsion was prepared from polyether and isophorone diisocyanate with acrylate oligomer (DJW-330) as modifier through self-emulsion method. The product was characterized by means of GPC, FTIR, DSC and Fluorescence microscope. The results showed that DJW-330 with required viscosity and relative molecular mass could be obtained by stepwisely adding 0.4% -0.6% azodiisobutyronitrile (based on the total acrylate monomer mass) and mixed acetone/ethyl acetate solvent with volume ratio of 3 : 4. When the dosage of DJW-330 was 1.4% (based on the total solid mass), integrative properties of the modified WPU was good, for example, the initial tack could reach 14#(ball number), the persistent adhesivity could maintain longer than 100 minutes and stability of the emulsion was high. The characterization results showed that DJW-330 was combined with the polyurethane by chemical bonding, the modified WPU had obvious bigger particle size and its thermal stability was greatly increased compared to unmodified WPU.
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