水性旋光UV固化聚氨酯乳液的合成及性能研究

Synthesis and Properties of Waterborne Rotatory UV Curable Polyurethane Emulsion

以4,4’-二环己基甲烷二异氰酸酯(HMDI)、季戊四醇三丙烯酸酯(PETA)、聚四氢呋喃(PTMEG-1000)、2,2-二羟甲基丙酸(DMPA)、左手性试剂S-联萘酚(S-BINOL)为主要原料合成了新型含联萘基团的水性旋光光固化聚氨酯(BPU)。采用傅立叶变换红外光谱仪(FT-IR)、核磁共振波谱仪(NMR)和凝胶渗透色谱仪(GPC)对BPU进行了表征。以BPU为主要成膜物制备了水性光固化涂料,探究了联萘酚基团的引入对高分子聚合物的透明性能、隔热性能、热稳定性、应用性能等的影响。结果表明:将联萘基团引入到水性聚氨酯乳液体系中,可以有效地改善乳液成膜后的隔热性能,所制备的涂膜拥有良好的透明性和力学性能。随着BPU中S-BINOL含量的增加,含有联萘基团的BPU红外发射率明显低于WPU,红外发射率随联萘基团含量的增加由0.892降低到0.672,刚性基团的引入对透明性影响不大,其在550 nm处的透光率均超过90%。

In 4,4'-dicyclohexylmethane diisocyanate(HMDI),pentaerythritol triacrylate(PETA),polytetrahydrofuran(PTMEG-1000),A new type of water-based polarimetric photocurable polyurethane(BPU)containing binaphthalene groups was synthesized by 2-dimethylol propionic acid(DMPA)and S-BINOL as the main raw materials.The BPU was characterized by Fourier transform infrared spectroscopy(FT-IR),nuclear magnetic resonance spectroscopy(NMR)and gel permeation chromatograph(GPC).The water-based photocurable coatings were prepared by using BPU as the main film forming material,adding deionized water,film forming additives,coating additives and photoinitiators.The influence of the introduction of binaphthol groups on the transparency,heat insulation,thermal stability and application performance of the polymer was investigated.The results showed that the introduction of binaphthyl group into aqueous polyurethane lotion system could effectively improve the thermal insulation performance of lotion after film formation,and the prepared film had good transparency and mechanical properties.With the increase of BINOL content in BPU,the infrared emittance of BPU containing binaphthalene groups was significantly lower than that of WPU,and the infrared emittance of BPU containing binaphthalene groups decreased from 0.892 to 0.672 with the increase of binol content.The introduction of rigid groups had little effect on the transparency,and the transmittance of BPU at 550 nm exceeds 90%.