摘要
采用二乙醇胺（DEOA）开环环氧树脂E-44制得端羟基环氧树脂（E-OH）,用E-OH合成一系列羟基环氧改性水性聚氨酯（EWPU）乳液,并研究了E-OH添加量对EWPU乳液的粒径及涂膜性能的影响.核磁氢谱（1H NMR）测定了E-OH的结构和开环率,傅里叶红外光谱（FT-IR）确定了水性聚氨酯（EWPU）的结构,激光粒度仪测定了EWPU乳液粒径,热重（TG）测定了EWPU的耐热性能.结果表明：随着E-OH添加量增大,EWPU预聚体黏度增大,乳液粒径增大,乳液稳定性下降.另外,随着E-OH添加量增大,EWPU胶膜吸水率、溶胀度、拉伸强度和断裂伸长率均出现先增加后降低的特点.EWPU胶膜力学强度最高可以达到26.69 MPa,断裂伸长率最高可以达到428.35％.综合分析实验数据得到E-OH在EWPU体系的最佳加入量为2.5％～3.5％.
This paper has described the synthesis of hydroxyl group terminated epoxy resin （E-OH） by ring-open reaction of epoxy resin （E-44） wilh diethanolanfine （DEOA）, which was then used to prepare a series of E-OH modified waterborne polyurethane （ EWPU ）. The effect of amount of E-OH on EWPU emulsion particle size and film properties was studied. The E-OH＇s structure and ring-opening ratio were determined by 1 H-NMR. The EWPU＇s slructures were investigated hy fourier transform infrared spectroscopy （FT-IR）. The EWPU emulsion partMe sizes were determined by laser particle size analyzer. Besides, the EWPUs＇ heat resistance was measured by lhermogravimetry （TG）. The study found thai the viscosity and particle size of EWPU prepolymers increased, but the slabilily of enmlsion decreased along with the increase of amount of E-OH. In addition, the water absorption rate of EWPUs＇ films, degree of swelling, lensile strength and elongation at break were increased and then de- creased with the. increase of amount of E-OH. EWPU fihns＇ mechanical slrenglh could reach26. 69 MPa, and elongation could reach 428.35%. The optimal amount of E-OH was found between 2. 5%- 3.5%.
出处
《涂料工业》
CAS
CSCD
北大核心
2014年第2期32-38,共7页
Paint & Coatings Industry
关键词
二乙醇胺
环氧树脂
改性
水性聚氨酯
diethanolamine
epoxy resin
modification
waterborne polyurethane
