Preparation and properties of biobased acrylate and silicon-modified waterborne polyurethane
[Introduction]The problems of low transmittance and poor mechanical properties of ultraviolet(UV)curable waterborne polyurethane(WPU)need to be solved.[Method]Isobornyl methacrylate(IBOMA)was reacted with 3-amino-1,2-propanediol(APDO)and 3-isocyanatopropyl triethoxysilane(IPTS)to synthesize a diol coded as IBOMA-Si-2OH containing isobornyl methacrylate and organosiloxane functional groups.A UV curable waterborne polyurethane(coded as IBOMA-Si-WPU)modified by IBOMA and organosiloxane was then prepared by using IBOMA-Si-2OH with other raw materials such as isophorone diisocyanate(IPDI),polycarbonate diol(PCDL),dimethylolpropionic acid(DMPA),pentaerythritol triacrylate(PETA),and trimethylolpropane(TMP).The effect of IBOMA-Si-2OH content on the properties of IBOMA-Si-WPU emulsion and its film was studied.[Result]The film prepared with IBOMA-Si-2OH 8%(molar fraction with respect to the total amount of IBOMA-Si-2OH and PCDL)had a transmittance as high as 93%in the visible light waveband,a water contact angle of 84.9°,a water absorption rate of 4.7%,a tensile strength of 7.1 MPa,and an elongation at break of 183%.[Conclusion]The introduction of IBOMA-Si-2OH improves the transmittance and mechanical properties of WPU coatings.
NETL
NSTL
万方数据
