4-HBA/E-51/有机氟硅多重改性水性聚氨酯

4-HBA/E-51/organofluorosilicon multi-modified waterborne polyurethane

通过预聚合和原位自由基共聚合两步法合成了一系列丙烯酸酯/环氧树脂/有机氟硅共同改性的水性聚氨酯杂化乳液,以提高水性聚氨酯的综合应用性能.首先,以二异氰酸酯(HDI)和聚酯多元醇(PE-3020)为单体,以2,2-二羟甲基丙酸(DMPA)为亲水扩链剂,以丙烯酸-4-羟基丁酯(4-HEA)、环氧树脂(E-51)和γ-缩水甘油醚氧丙基三甲氧基硅烷(KH-560)为改性剂制得了-NCO封端、含有双键的聚氨酯预聚体;然后,将封端的预聚体与甲基丙烯酸六氟丁酯(HFBMA)原位自由基共聚合,制得了4-HEA/E-51/KH-560/HFB-MA共同改性的水性聚氨酯杂化乳液(HEKHWPU).采用傅里叶红外光谱仪、X射线衍射仪、粒径分析仪、热失重分析仪(TG)、光学视频接触角测量仪等,对聚合物膜进行了表征,并考察了在4-HEA为5%和KH-560为2%时,改性剂E-51和HFBMA的用量对HEKHWPU胶膜的耐水性、力学性能和乳液粒径等的影响.结果表明,当E-51加入量为5%,HFBMA为30%时乳液外观呈现半透明泛蓝光,乳液粒径均匀,拉伸强度达到9.430 MPa,断裂伸长率达317.5%,呈现的水接触角为107°,吸水率从32.8%降低至6.07%.说明经4-HEA/E-51/KH-560/HFBMA多重改性的WPU综合性能得到了显著提高.

In this paper,a series of acrylate/epoxy resin/organofluorosilicon co-modified waterborne polyurethane hybrid emulsions were synthesized by prepolymerization and in situ free radical copolymerization to improve the comprehensive application performance of waterborne polyurethane.Firstly,diisocyanate(HDI)and polyester polyol(PE-3020)were used as monomers,2,2-dimethylpropionic acid(DMPA)was used as a hydrophilic chain extender,and 4-hydroxybutyl acrylate(4-HEA),epoxy resin(E-51)andγ-(2,3-epoxypropoxy)propytrimethoxy-silane(KH-560)were used as modifiers to produce an-NCO terminated and double-bonded polyurethane prepolymer.Then,the capped prepolymer is copolymerized with hexafluorobutyl methacrylate(HFBMA)in situ to obtain 4-HEA/E-51/KH-560/HFBMA co-modified waterborne polyurethane hybrid emulsion(HEKHWPU).The polymer(film)was characterized by Fourier transform infrared spectroscopy,X-ray diffractometry,particle size analyzer,thermogravimetric analyzer(TG),optical video contact angle measuring instrument.When the 4-HEA was 5%and the KH-560 was 2%,the amount of modifier E-51 and HFBMA has an effect on the water resistance,mechanical properties and emulsion particle size of WPU modified film.The results showed that when E-51 was added in 5%and HFBMA was 30%,the appearance of the emulsion showed translucent blue light,the emulsion particle size was uniform,the tensile strength reached 9.430 MPa,the elongation at break was 317.5%,and the angle was 107°.The water absorption decreased from 32.8%to 6.07%.In summary,the comprehensive performance of 4-HEA/E-51/K-H-560/HFBMA multi-modified WPU has been significantly improved.