基于聚二甲基硅氧烷改性超支化聚硫氨酯 制备紫外光固化易清洁涂层

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中图分类号：TB34 文献标志码：A

Preparation of UV-Curable Easy-Cleaning Coatings Based on Polydimethylsiloxane-Modified Hyperbranched Polythiourethane

LEI Xiaotian，WEI Mengjie，WUJing， ZHUYe，LI Xiaojie （KeyLaboratoryofSyntheticandBiological Colloids，MinistryofEducation，SchoolofChemicalandMaterialEngiering， Jiangnan University， Wuxi ， Jiangsu， China）

Abstract： Polydimethylsiloxane （PDMS）-containing hyperbranched polythiourea （PDMS-HBPTU） was synthesized using monohydroxyl-teminatedpolyimethylsioxane （DMS-OH），isophoronedsocyanate （ID），andtrimethylolpropanetris（- mercaptopropionate）（TMPMP）as raw materials. The PDMS-HBPTU was then added to polycaprolactone-based polyurethane acrylate （LPUA）coatings to prepare a series of easy-cleaning coatings with diferent mass fractions of PDMS-HBPTU.The efectsof the mass fraction ofPDMS-HBPTUon the wettability，lighttransmitance，anti-pollution properties，and wear resistance of the coatings were systematically investigated using the optical contact angle meter，UV-Vis spectrophotometer， oil-based marker ink，and the tribometer.The results indicate that when the mass fraction of PDMS-HBPTU is 2.0% the contactangles of water and hexadecane on thecoating surface are significantly increased，whilethe sliding anglesof water andthesurfaceenergyof the coating arereduced. Additionall，thecoating maintains high light transmitanceand exhibits decreased surface roughness XPS data indicates thatthe PDMS segments are enriched on the coating surface，forming a lowsurface-energy interface.Thecoating demonstrates excelent anti-staining andeasy-cleaning properties againstoil-based marker nk as wellascommonliquids such as milk，cooking oil，and beverages.After 5O rubbing cycles withcottncloth， the water contact angle of the coating decreases by only 6.02% ，retaining good anti-graffiti performance，which highlights its excellent wear resistance.The hyperbranched structure efectively improves the compatibility between PDMSand the matrix resin. When the mass fraction of PDMS-HBPTU is 2.0% ， the coating not only maintains high transmittance but also possesses excellent surface hydrophobicity/oleophobicity，easy-cleaning properties，and wear resistance，showing good prospects for practical applications.

Key words： UV-curing; hyperbranched structure;low surface energy； easy-cleaning coating; wear resistance

易清洁涂层凭借其低表面能及微纳结构，赋予表面优异的疏水性、疏油性与抗污性能，可有效防止污染物黏附与渗透[，从而简化清洁维护过程，有利于保持表面功能与美观]。（剩余19985字）