水性聚氨酯涂料的防污自洁特性及其施工。

Anti-smudge and self-cleaning characteristics of waterborne polyurethane coating and its construction.

机构信息

Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, PR China.

Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, PR China; State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, China.

出版信息

J Colloid Interface Sci. 2022 Dec 15;628(Pt B):1070-1081. doi: 10.1016/j.jcis.2022.08.017. Epub 2022 Aug 4.

DOI:10.1016/j.jcis.2022.08.017

PMID:36055086

Abstract

A novel anti-smudge coating, based on waterborne polyurethane (WPU), Polydimethylsiloxane (PDMS) and Hexamethoxymethylmelamine (HMMM) was constructed. Specifically, hydroxyl capped WPU emulsions grafted with PDMS (WPU-g-PDMS) were prepared firstly, then the Hexamethoxymethylmelamine (HMMM) was used as the crosslinking agent to block the polar hydrophilic hydroxyl groups and the carboxyl groups in WPU-g-PDMS and increase the cross-linking density of the coating. Oily markers, water, hexadecane, fingerprint liquid, and common liquids in life (milk, coffee, ink and cooking oil) were utilized to demonstrate the anti-graffiti and self-cleaning characteristics of coatings. Aside from having great transparency and exceptional resistance to liquid corrosion, the coating still retains its anti-smudge capabilities even when bent or impacted, and they also exhibit 5B adhesion and 5H pencil hardness. This work provides novel idea and strategy for the preparation of WPU anti-smudge coatings.

摘要

一种新型的防污涂层，基于水性聚氨酯（WPU）、聚二甲基硅氧烷（PDMS）和六羟甲基三聚氰胺（HMMM）构建而成。具体来说，首先制备了接枝有 PDMS 的端羟基封端的 WPU 乳液（WPU-g-PDMS），然后将 HMMM 用作交联剂来封闭 WPU-g-PDMS 中的极性亲水性羟基和羧基，并增加涂层的交联密度。利用油性标记物、水、十六烷、指纹液和生活中的常见液体（牛奶、咖啡、墨水和食用油）来演示涂层的抗涂鸦和自清洁特性。除了具有高透明度和优异的耐液体腐蚀性外，即使弯曲或受到冲击，涂层仍能保持防污性能，并且还具有 5B 附着力和 5H 铅笔硬度。这项工作为制备 WPU 防污涂层提供了新的思路和策略。