以可再生资源松节油衍生物——甲基丙烯酸异冰片酯(IBOMA)为原料,采用共聚改性的方法制备了IBOMA改性水性聚氨酯复合乳液。研究了配方中的R值(n(—NCO)/n(—OH),异氰酸根指数)、DMPA(2,2-二羟甲基丙酸)含量、DEG(一缩二乙二醇)含量、中和度(以三乙胺与DMPA的摩尔比计算),以及反应时间对复合乳液的黏度、稳定性以及胶膜的吸水率、拉伸强度的影响,确定了适宜的改性工艺条件:IBOMA添加量为30%,R值为1.70,DMPA质量分数为4.0%,DEG质量分数为0.5%,中和度为100%,反应时间为6 h。在此条件下所制得的IBOMA改性水性聚氨酯乳液的综合性能较好,其耐水性、耐热性、拉伸强度等性能指标均有提高,吸水率由改性前的11.53%降至3.91%,拉伸强度由改性前的23.42 MPa升至55.18 MPa,玻璃化转变温度Tg由改性前的-7.23 ℃上升至25.31 ℃,并采用傅里叶红外光谱、差示扫描量热仪等分析手段,对IBOMA改性水性聚氨酯的性能进行了表征。
Abstract
The composite emulsion of modified waterborne polyurethane(WPU)was prepared by copolymerization using the isobornyl methacrylate(IBOMA)which was the derivative of the renewable resource turpentine as the modifying reagent. Influence of R value, the contents of 2,2-dimethylolpropionic acid(DMPA)and diethylene glycol(DEG), the neutralization degree of the composite, and the reaction time of the emulsion on the viscosity, stability of the composite emulsion, water absorption and the tensile strength of the modified WPU film was studied. The suitable modification conditions were determined as follows: the amount of IBOMA 30%, R value was 1.70, DMPA 4.0%, DEG 0.5%, neutralization degree 100%, and reaction time 6 h. The comprehensive properties of WPU before and after modification were enhanced, the water absorption was reduced from 11.53% to 3.91%, the glass transition temperature Tg was increased from -7.23 to 25.31℃, and the tensile strength was increased from 23.42 to 55.18 MPa, respectively. Furthermore, the modified WPU composite was analyzed by FT-IR and DSC.
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基金
收稿日期:2015-01-26 修回日期:2015-09-08
基金项目:国家林业局引进国际先进林业科学技术项目(2013-4-05); 江苏省生物质绿色燃料与化学品重点实验室开放基金项目(JSBGFC13005,JSBEM2014010)
第一作者:徐徐(xuxu200121@1636.com),副教授。*通信作者:王石发(wangshifa65@163.com),教授。
引文格式:徐徐,曹晓琴,邢蓥滢,等. IBOMA共聚改性水性聚氨酯的合成及其性能研究[J]. 南京林业大学学报(自然科学版),2016,40(1):104-110.
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