Mixed urushiol and laccol compositions in natural lacquers: Convenient evaluation method and its effect on the physicochemical properties of lacquer coatings

Title
Mixed urushiol and laccol compositions in natural lacquers: Convenient evaluation method and its effect on the physicochemical properties of lacquer coatings
Authors
이연희이상수임정아이보라이한나한혜미김동영조정호
Keywords
Natural lacquers; Urushiol; Laccol; Catechol lipids; Mixing compositions; Physicochemical properties
Issue Date
2021-05
Publisher
Progress in organic coatings
Citation
VOL 154, 106195
Abstract
An evaluation of the catechol lipid compositions of natural lacquer materials and their correlation with the physicochemical properties of lacquer films have become important issues for the advancement of natural lacquer technologies. Here, a convenient method for evaluating the relative composition of urushiol and laccol catechol lipids in natural lacquers using Fourier transform infrared (FT-IR) analysis is proposed. Urushiol and laccol exhibited different characteristic peaks in the FT-IR spectrum owing to the different stereoisomer structures of the conjugated dienes, and the peak positions linearly shifted according to the relative content of the urushiol and laccol components in the natural lacquers. This evaluation method was applicable for estimating the mixing compositions of laccol and urushiol in commercially available natural lacquer products. A quantitative analysis of the physicochemical properties of various lacquer films with urushiol, laccol, and their mixtures confirmed that the hardening speed, mechanical hardness, adhesion, and corrosion resistance deteriorated, whereas the transparency and haze properties improved as the laccol content increased. This study suggests that the estimation and optimization of laccol and urushiol compositions in natural lacquers are an important strategy for improving the physicochemical properties of natural lacquer films and extending their applications in various functional coatings.
URI
http://pubs.kist.re.kr/handle/201004/73078
ISSN
0300-9440
Appears in Collections:
KIST Publication > Article
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