A comparative study on water resistance of polyurethane and epoxy resin coatings

doi:10.19491/j.issn.1001-9278.2024.02.007

Abstract

Abstract:

In this study， the hydrolysis behavior of four types of polymer coatings， including three polyurethanes and one epoxy resin were evaluated with the assistance of Fourier⁃transform infrared spectroscopy， solid⁃state nuclear magnetic resonance， thermogravimetric analysis， and dynamic mechanical analysis. The results demonstrated that the polyether⁃based polyurethane coating exhibited superior water resistance and minimal impact on its chemical structure due to hydrolysis. However， the incorporation of ceramic particles can significantly accelerate the hydrolysis， resulting in an increase in water absorption and a decrease in coating performance. Both polyester⁃based polyurethane and epoxy resin coatings exhibited poor water resistance under the same conditions， and a chemical degradation might occur， resulting in an increase in storage modulus.

Key words: hydrolysis, coating, polyurethane, epoxy resin

CLC Number:

TQ323

LIU Gang, JIANG Xiong, LANG Tao, WANG Yi, ZHANG Lu, HU Songchao, CHANG Yijun, ZHANG Qilu. A comparative study on water resistance of polyurethane and epoxy resin coatings[J]. China Plastics, 2024, 38(2): 39-44.

Figures/Tables 6

Fig.1. FTIR spectra of coating of the samples before and after hydrolysis

样品	参照样品	水解样品	F_IR/%
PTMG⁃PU	1 888	2 920	55
PEA⁃PU	2 264	5 815	157
PTMG⁃PU/陶瓷	1 500	4 993	233
EP	10 079	22 553	124

Tab.1. FIR of the samples

Fig.2. Solid state nuclear magnetic resonance carbon spectra of coating of the samples before and after hydrolysis

Fig.3. Hydrolysis reaction equation of PU⁃PEA

Fig.4. TG and DTG curves of the samples

Fig.5. Change of E′，E″ and tanθ with temperature

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