Preparation and performance of a soybean oil⁃based polyurethane coating for ships

doi:10.19491/j.issn.1001-9278.2025.12.007

Abstract

Abstract:

A soybean oil⁃based polyurethane prepolymer was synthesized by first reacting epoxidized soybean oil with methanol catalyzed by tetrafluoroboric acid， followed by reaction with 2，4⁃toluene diisocyanate. The chemical structure of the prepolymer was confirmed by Fourier⁃transform infrared spectroscopy. Coatings were prepared by applying the prepolymer onto tinplate substrates and curing at room temperature for seven days. The effects of the —NCO to —OH molar ratio （R value） and reaction conditions on the coating properties， including contact angle， physical properties， and corrosion resistance， were investigated. Results indicated that the coating prepared with an R value of 2∶1， a reaction temperature of 70~75 ℃， and a reaction time of 2 h exhibited the optimal comprehensive performance.

Key words: soybean oil polyol, polyurethane, coating, performance

CLC Number:

TQ323.8

LIU Yunxue, SHI Xifan, FAN Zhaorong, GU Yaxin, LI Xiangyu, WANG Xiaodan. Preparation and performance of a soybean oil⁃based polyurethane coating for ships[J]. China Plastics, 2025, 39(12): 39-45.

Figures/Tables 18

Fig.1. Synthetic route of soybean oil polyurethane

ISO等级	测试结果
0	无脱落，为最佳
1	细小的部分脱落或明显脱落，脱落面积不超过涂层总面积的5 %
2	切口和相交处边缘被剥落面积在5 %~15 %之间
3	沿切口边缘大面积或部分脱落，脱落面积在15 %~35 %之间
4	比3级稍微好一点，脱落面积在35 %~65 %之间
5	剥落面积大于65 %

Tab.1. Adhesion test criteria

Fig.2. Infrared spectra of epoxy soybean oil， soybean oil polyol and soybean oil polyurethane prepolymer

Fig.3. Surface morphology of soybean oil polyurethane coating with different R values

Fig.4. Contact angle of soybean oil polyurethane coating with different R values

R值	1∶1	1.5∶1	2∶1	2.5∶1	3∶1
附着力/等级	0	1	5	4	4
铅笔硬度	3B	2B	4H	6H	5H
冲击强度/cm	50	50	50	10	8

Tab.2. Physical properties of soybean oil polyurethane coating with different R values

R值	1∶1	1.5∶1	2∶1	2.5∶1	3∶1
吸水率/%	0.223	0.092	0.067	0.082	0.088

Tab.3. Water absorption of soybean oil polyurethane coating with different R values

R值	1∶1	1.5∶1	2∶1	2.5∶1	3∶1
浸泡7天
浸泡21天

Tab.4. Salinity resistance of soybean oil polyurethane coatings with different R values

Fig.5. Alkali resistance of soybean oil polyurethane coatings with different R values

Fig.6. Contact angle of soybean oil polyurethane coating under different reaction conditions

Fig.7. Water absorption of soybean oil polyurethane coating under different reaction conditions

Fig.8. Pencil hardness of soybean oil polyurethane coating under different reaction conditions

Fig.9. Adhesion of soybean oil polyurethane coating under different reaction conditions

Fig.10. Impact strength of soybean oil polyurethane coating under different reaction conditions

Fig.11. Alkali resistance of soybean oil polyurethane coating under different reaction conditions

	时间/h			温度/℃			催化剂用量/mL
	1.5	2	2.5	70	75	80	0	0.1	0.2
浸泡7天
浸泡21天

Tab.5. Salt water resistance of soybean oil polyurethane coating under different reaction conditions

Fig.12. TG plot of soybean oil polyurethane coating at R=2∶1

Fig.13. SEM of R=2∶1 and R=3∶1

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