Preparation and performance of biobased polyurethane anti⁃graffiti and self⁃cleaning coating

doi:10.19491/j.issn.1001-9278.2023.02.003

Abstract

Abstract:

In this work， a vegetable oil⁃based （ESOD） polyol with a high hydroxyl value was obtained through a ring⁃opening reaction between epoxidized soybean oil and 2，2⁃bis（hydroxymethyl）propionic acid using a solvent⁃free method. To fabricate an anti⁃graffiti and self⁃cleaning coating， the ESOD polyol， mono⁃hydroxy⁃terminated polydimethylsiloxane （PDMS⁃OH）， and hexamethylene diisocyanate trimer were employed as a polyol component， a low surface energy component， and a curing agent， respectively. The as⁃prepared biobased coatings look very smooth and transparent. With incorporating only 1 % of PDMS⁃OH， the resulting coatings exhibited outstanding anti⁃graffiti and self⁃cleaning performance. The droplets of water， coffee， rice vinegar， hexadecane， or peanut oil could slide off from the surface of the coa⁃tings without leaving any wetting footprints. Graphite powders， clay powders， and orange pigment powders could be efficiently removed by dripping water. Impressively， the coatings presented good wear resistance. Even after subjected to 1，200 cycles of writing and erasing with an oil⁃based marker pen， the coatings still exhibited a good ink shrinkage ability due to easy easing of ink traces.

Key words: polyurethane coating, anti?graffiti, self?cleaning, biobased polyol, epoxidized soybean oil

CLC Number:

TQ323.8

WEI Daidong, LI Huizhi, ZENG Juanjuan, ZHAO Chuanguo, LI Shiqiang. Preparation and performance of biobased polyurethane anti⁃graffiti and self⁃cleaning coating[J]. China Plastics, 2023, 37(2): 15-21.

Figures/Tables 8

Fig.1. Synthesis of biobased polyol and preparation mechanism of the coating

反应时间/h	0	2	4	6	8
环氧值/%	6.391	1.117	0.130	0.066	0.058

Tab.1. Epoxy value of reaction product versus reaction time

Fig.2. Structural analysis of the reaction products

样品	物料/g						铅笔硬度/H	附着力/等级
样品	ESOD	HDIT	PDMS⁃OH	DMF	MIBK	DBTDL	铅笔硬度/H	附着力/等级
ERD⁃0	5.0	10.08	0	9.0	9.0	0.02	3	5B
ERD⁃1	5.0	10.08	0.15	9.0	9.0	0.02	3	5B
ERD⁃2	5.0	10.08	0.30	9.0	9.0	0.02	3	5B
ERD⁃3	5.0	10.08	0.45	9.0	9.0	0.02	3	5B

Tab.2. Formulation and properties of the coatings

Fig.3. Effect of PDMS⁃OH addition on coating performance

Fig.4. XPS spectrum and elemental mapping images of EPU⁃1 coating surface

Fig.5. Self⁃cleaning performance of EPU⁃1 coatings （The inclination angles were 30°）

Fig.6. Anti⁃graffiti performance of the coatings

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