摘要
将亲水基团引入硝化纤维素分子中是消除硝基涂料VOC含量过高缺陷的重要手段。为获得最佳反应条件,分析了异氰酸酯与硝化纤维素分子反应动力学的特点;通过测定不含催化剂及不同催化剂浓度、不同反应温度下异氰酸酯浓度随时间的变化,配合数学处理,得到了两者反应时的活化能、最佳催化剂浓度、不同条件下的反应速率常数等参数,推导了反应机理。认为异氰酸酯与硝化纤维素反应为二级反应,催化剂的加入可极大提高反应速率,并降低活化能50%。
It＇s an effective way to eliminate the higher volatile organic compounds （VOC） in NC coatings by introducing hydrophilic group into the nitrocellulose molecules. In order to gain the best reaction parameters, the kinetics characteristics of reaction between isocyanate and nitrocellulose was studied in the current paper, With the aid of mathematical treatment, various reaction parameters, such as activation energy, optimum concentration of the catalyst, and the reaction rate constant under different conditions were evaluated by determining the variations of isocyanate concentration against reaction time when varying the concentrations of different catalysts （including zero concentration, i.e. without using any catalysts） and reaction temperatures, and eventually the reaction mechanism were derived. It suggested that the reaction between isocyanate and nitrocellulose is a second order reaction, and use of catalyst can speed up the reaction greatly and reduce the activation energy by 50%.
出处
《涂料工业》
CAS
CSCD
北大核心
2011年第4期44-48,共5页
Paint & Coatings Industry
基金
西京学院校内科研基金(编号:10B02)资助项目
