Syntheses and Characteristics of Urushiol-Based Waterborne UV-Cured Wood Coatings

The manufacture and properties of waterborne UV-cured coatings (WUV coatings) by acetone process based on urushiol for wood finishing were investigated. Firstly, epoxide urushiol (EU) was prepared by reacting urushiol with epichlorohydrin. Secondly, the EU was reacted with acrylic acid to obtain acr...

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Autores principales:	Chia-Wei Chang, Jyun-Ya Liao, Kun-Tsung Lu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	oriental lacquer urushiol epoxide urushiol acrylic epoxide urushiol WUV wood coatings Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/69381427ef48406e9970e040a57a4836
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spelling	oai:doaj.org-article:69381427ef48406e9970e040a57a48362021-11-25T18:49:17ZSyntheses and Characteristics of Urushiol-Based Waterborne UV-Cured Wood Coatings10.3390/polym132240052073-4360https://doaj.org/article/69381427ef48406e9970e040a57a48362021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/22/4005https://doaj.org/toc/2073-4360The manufacture and properties of waterborne UV-cured coatings (WUV coatings) by acetone process based on urushiol for wood finishing were investigated. Firstly, epoxide urushiol (EU) was prepared by reacting urushiol with epichlorohydrin. Secondly, the EU was reacted with acrylic acid to obtain acrylic epoxide urushiol (AEU). Next, the prepolymers were synthesized by the reaction of AEU, 2,2-Bis(hydroxymethyl)propionic acid (DMPA), and isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI), respectively, using acetone as a solvent. The prepolymers were further neutralized by triethylamine (TEA) to obtain ionomers and dispersed in the water. After removing the acetone by vacuum distillation, the polyurethane dispersions (PUDs) were obtained. Finally, the WUV coatings were performed by adding a photoinitiator (Irgacure 2959). The products in the synthesized processes and the properties of the WUV coatings were examined. The results showed that the EU, AEU, prepolymers, and ionomers could be synthesized stably. The PUDs synthesized by the IPDI and HDI had a similar solid content of 25.2% and 26.2%, and similar pH values of 7.8 and 7.6. However, the IPDI-containing PUD displayed lower viscosity, smaller particle size, and a more even polydispersity index. The IPDI-containing WUV film displayed a higher hardness, gloss, and lightfastness. The HDI-containing WUV film possessed superior impact resistance. Both IPDI-containing and HDI-containing WUV films showed excellent adhesion, bending resistance, and mass retention, and demonstrated a potential for wood finishing.Chia-Wei ChangJyun-Ya LiaoKun-Tsung LuMDPI AGarticleoriental lacquerurushiolepoxide urushiolacrylic epoxide urushiolWUV wood coatingsOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 4005, p 4005 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	oriental lacquer urushiol epoxide urushiol acrylic epoxide urushiol WUV wood coatings Organic chemistry QD241-441
spellingShingle	oriental lacquer urushiol epoxide urushiol acrylic epoxide urushiol WUV wood coatings Organic chemistry QD241-441 Chia-Wei Chang Jyun-Ya Liao Kun-Tsung Lu Syntheses and Characteristics of Urushiol-Based Waterborne UV-Cured Wood Coatings
description	The manufacture and properties of waterborne UV-cured coatings (WUV coatings) by acetone process based on urushiol for wood finishing were investigated. Firstly, epoxide urushiol (EU) was prepared by reacting urushiol with epichlorohydrin. Secondly, the EU was reacted with acrylic acid to obtain acrylic epoxide urushiol (AEU). Next, the prepolymers were synthesized by the reaction of AEU, 2,2-Bis(hydroxymethyl)propionic acid (DMPA), and isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI), respectively, using acetone as a solvent. The prepolymers were further neutralized by triethylamine (TEA) to obtain ionomers and dispersed in the water. After removing the acetone by vacuum distillation, the polyurethane dispersions (PUDs) were obtained. Finally, the WUV coatings were performed by adding a photoinitiator (Irgacure 2959). The products in the synthesized processes and the properties of the WUV coatings were examined. The results showed that the EU, AEU, prepolymers, and ionomers could be synthesized stably. The PUDs synthesized by the IPDI and HDI had a similar solid content of 25.2% and 26.2%, and similar pH values of 7.8 and 7.6. However, the IPDI-containing PUD displayed lower viscosity, smaller particle size, and a more even polydispersity index. The IPDI-containing WUV film displayed a higher hardness, gloss, and lightfastness. The HDI-containing WUV film possessed superior impact resistance. Both IPDI-containing and HDI-containing WUV films showed excellent adhesion, bending resistance, and mass retention, and demonstrated a potential for wood finishing.
format	article
author	Chia-Wei Chang Jyun-Ya Liao Kun-Tsung Lu
author_facet	Chia-Wei Chang Jyun-Ya Liao Kun-Tsung Lu
author_sort	Chia-Wei Chang
title	Syntheses and Characteristics of Urushiol-Based Waterborne UV-Cured Wood Coatings
title_short	Syntheses and Characteristics of Urushiol-Based Waterborne UV-Cured Wood Coatings
title_full	Syntheses and Characteristics of Urushiol-Based Waterborne UV-Cured Wood Coatings
title_fullStr	Syntheses and Characteristics of Urushiol-Based Waterborne UV-Cured Wood Coatings
title_full_unstemmed	Syntheses and Characteristics of Urushiol-Based Waterborne UV-Cured Wood Coatings
title_sort	syntheses and characteristics of urushiol-based waterborne uv-cured wood coatings
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/69381427ef48406e9970e040a57a4836
work_keys_str_mv	AT chiaweichang synthesesandcharacteristicsofurushiolbasedwaterborneuvcuredwoodcoatings AT jyunyaliao synthesesandcharacteristicsofurushiolbasedwaterborneuvcuredwoodcoatings AT kuntsunglu synthesesandcharacteristicsofurushiolbasedwaterborneuvcuredwoodcoatings
_version_	1718410650154172416

Syntheses and Characteristics of Urushiol-Based Waterborne UV-Cured Wood Coatings

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