桐油基水性光固化树脂的合成及性能

Preparation and Properties of Tung Oil-based Waterborne UV-curable Resin

以生物质资源桐油(TO)、马来酸酐(MA)为原料,通过Diels-Alder反应合成了桐油酸酐(TM),再与丙烯酸羟乙酯(HEA)反应,经三乙胺(TEA)中和水化制备了桐油基水性光固化树脂。采用傅里叶红外光谱、核磁共振氢谱对产物的结构进行了表征。考察了TO、MA、HEA以及TEA的比例对桐油基水性光固化树脂的乳液性质、固化性质以及固化膜性能的影响。结果表明,当n(TO)∶n(MA)∶n(HEA)∶n(TEA)=1∶2.5∶2.5∶2.5时,合成的桐油基水性光固化树脂的综合性能最优异,其乳液贮存稳定性大于180 d,固化膜的铅笔硬度达到5 B,附着力达到3级,耐冲击性可达50 kg·cm,柔韧性可达0.5 mm,耐水性达到48 h。

Tung oil anhydride（ TM） was synthesized via a Diels-Alder reaction with tung oil（ TO） and maleic anhydride（ MA） as raw materials. Then,TM reacted with 2-hydroxylethyl acrylate（ HEA）.Finally,treatment of the above reaction product with triethylamine（ TEM） afforded tung oil-based waterborne UV-curable resin. The structures of synthetic products were characterized by Fourier transform infrared spectroscopy（ FTIR） and hydrogen nuclear magnetic resonance spectroscopy（1HNMR）. The different mole ratio of TO,MA,HEA and TEA was selected to investigate the influence on emulsion properties,curing properties and curing film performances of tung oil-based waterborne UV-curable resin. The results showed that when the mole ratio of TO,MA,HEA and TEA was 1∶2. 5∶2. 5∶ 2. 5,the synthesized resin had the best comprehensive performance. The storage stability of the emulsion was more than 180 days. The pencil hardness,adhesion,resistance to impact,flexibility and resistance to water of the curing film reached 5B,level 3,50 kg·cm,0. 5 mm and 48 h,respectively.