Synthesis and properties of transparent fluorinated polyurethane coatings

被引：2

作者：

Zhang, Jun-Rui ^{[1
]}

Tu, Wei-Ping ^{[1
]}

Dai, Zi-Lin ^{[2
]}

机构：

[1] School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong

[2] Institute of Chemical Engineering, Guangdong General Research Institute for Industrial Technology, Guangzhou 510651, Guangdong

来源：

Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | 2014年 / 42卷 / 02期

关键词：

Fluorinated isocyanate prepolymer; Fluorinated polyurethane; Mechanical property; Polyester ployol; Polyurethane; Transpa-rency; Water resistance;

D O I：

10.3969/j.issn.1000-565X.2014.02.006

中图分类号：

学科分类号：

摘要：

Polyisocyanate and dihydric alcohols with different fluorocarbon chain lengths were used as raw materials to synthesize a series of fluorinated isocyanate prepolymers, and the prepolymers were then reacted with self-made random copolymerized polyester polyol to prepare transparent fluorinated polyurethane coatings. Afterwards, a variety of analytical methods were used to characterize the structure and properties of the coatings, and the effect of fluorocarbon chains on the coating properties was finally discussed. The results indicate that (1) the introduction of fluorocarbon chains increases the internal short-range ordered structure in polyurethanes, with an increase degree being inversely proportional to the length of fluorocarbon chains, which leads to a decline of coating transparency; (2) the mechanical properties of polyurethanes degrade with the introduction of fluorocarbon chains, and the degradation slows down in the presence of moderate micro-phase separation in fluorinated polyurethanes; (3) the introduction of fluorine improves the thermal resistance of polyurethanes, especially under the condition of shorter fluorocarbon chains; (4) the fluorine in fluorinated polyurethanes may migrate to the surface and reduces the surface energy, and the migration degree is related to the crystallization degree of fluorinated isocyanate; and (5) moderate crosslinking and the migration of fluorine may lead to excellent water resistance of fluorinated polyurethanes.

引用

页码：33 / 38

页数：5

共 13 条

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