摘要
采用端羟丙基聚硅氧烷(DHPDMS)为改性剂,以异佛尔酮二异氰酸酯(IPDI)、聚丙二醇(PPG)、二羟甲基丙酸(DMPA)以及三羟甲基丙烷(TMP)为主要原料,通过预聚体法制备了聚氨酯多元醇水分散体系(SiHPUA),并与亲水改性多异氰酸酯固化剂配制成有机硅改性双组分水性聚氨酯(Si-2KWPU)。利用FTIR、1HNMR、XRD与TGA分别对聚合物结构与性能进行表征,研究了有机硅含量对多元醇水分散体和2KWPU涂膜性能的影响。结果表明,随着有机硅含量的增加,聚氨酯多元醇水分散体的粒径增大,黏度降低,涂膜的吸水率和拉伸强度下降,接触角和断裂伸长率升高。当体系中有机硅质量分数为5%时,涂膜的综合性能最佳,吸水率和接触角分别为6.2%、94.96°;热分解温度为272℃时,质量损失为5%。
Siloxane-modified two-component waterborne polyurethane（Si-2KWPU） was synthesized by the reaction between siloxane-modified hydroxyl-functional polyurethane aqueous dispersion（SiHPUA）,which were prepared by prepolymer process,with isophorone diisocyanate（IPDI）,polypropylene glycol（PPG）,dimethylol propionic acid（DMPA） and trimethylolpropane（TMP） as main raw materials,dihydroxypropyl terminated polydimethylsiloxane（DHPDMS） as modifier,and the hydrophilic-modified polyisocyanate.The polymer structure and properties was characterized respectively by FTIR,1HNMR,XRD,TGA,and studied the effect of silicone content on the performance of hydroxyl-functional polyurethane aqueous dispersion and the 2K-WPU film.The results showed that the particle size of the dispersion increased,the viscosity decreased,the water absorption rate and tensile strength of membrane decreased,the water contact angle and elongation at break increased,with the increase of conent of silicone.When the mass fraction of silicone was 5%,the membrane had the best comprehensive performance.Water absorption rate and the contact angle were respectively 6.2%,94.96°;The decomposition temperature of 5% mass loss was 272 ℃.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2016年第4期377-382,412,共7页
Fine Chemicals
关键词
有机硅
双组分
水性聚氨酯
功能材料
silicone
two-component
waterborne polyurethane
functional materials
