UV固化单体及低聚物在塑胶基材上的附着力与化学结构之间关系的研究

Study of Relationship between Adhesion and Chemical Structure of UV-Curable Monomers and Oligomers

测试了不同的单体和低聚物在ABS上的附着力;并从化学结构角度分析了造成附着力差异的原因。指出化学结构是决定附着力的首要因素,而不是体积收缩;酯键和醚键分别起到增加附着力和降低附着力的作用。提出了衡量附着力的3个概念:酯键密度(C_(es))、醚键密度(C_(et))和酯键醚键密度比(C_(es)/C_(et))。对于不含醚键的单体和低聚物,如果C_(es)≥0.6%,则可在ABS上获得良好的附着力。对于含有醚键的单体和低聚物,需要C_(es)和C_(es)/C_(et)同时满足条件:只有C_(es)≥0.6%,并且C_(es)/C_(et)≥4,才能获得良好的附着力。

The adhesion of different monomers and oligomers on ABS substrate are tested and the testing results are analyzed from the view of chemical structure. It is revealed that chemical structure rather than volume shrinkage is the most important influential factor on adhesion, and ester bonds can improve adhesion of monomers ＆ oligomers on ABS substrate while ether bonds reduce adhesion. Three concepts are provided to estimate adhesion： concentration of ester bond （ Ces ）, concentration of ether bond （Cet） and their ratio （Ces/Cet）. For monomers and oligomers without ether bonds, they will show good adhesion on ABS if Ces is not less than 0.6%. For monomers and oligomers with ether bonds, they will show good adhesion on ABS if Ces is not less than 0. 6% and Ces/Cet is not less than 4 simultaneously.