Multifunctional vegetable oil-based hyperbranched photocurable prepolymer and its preparation method and application
A light-curing prepolymer, vegetable oil-based technology, used in applications, inks, household appliances, etc., can solve problems such as performance gaps, improve pencil hardness, enhance acid and alkali resistance, boiling water resistance and other properties, and the effect of large output
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Embodiment 1
[0033] A preparation method of a multifunctional castor oil-based hyperbranched photocurable prepolymer, comprising the steps:
[0034] (1) 9.33g of castor oil, 3.41g of thioglycerol and 0.40g of 2-hydroxy-2-methylpropiophenone were added to the reaction kettle, diluted with 15g of dichloromethane, and the reaction was stirred at room temperature for 5h under 360nm ultraviolet light irradiation , after the reaction is completed, the reaction solution is rotary evaporated to remove dichloromethane, and the castor oil-based polyol can be obtained, and its infrared spectrum is shown in figure 2 , see NMR spectrum image 3 ; The molar ratio between the double bond in the vegetable oil and the thiol group in the thioglycerol is 1:1.05.
[0035] (2) 12.6 g of castor oil-based polyol prepared in step (1), 12.8 g of isocyanoethyl methacrylate and 0.02 g of polymerization inhibitor hydroquinone were added to the reaction kettle, and the reaction was stirred at 45 °C After half an ho...
Embodiment 2
[0038] A method for preparing a multifunctional tung oil-based hyperbranched photocurable prepolymer, comprising the steps of:
[0039] (1) 8.73g of tung oil, 8.52g of thioglycerol and 0.52g of 2-hydroxy-2-methylpropiophenone were added to the reaction kettle, diluted with 15g of dichloromethane, and stirred at room temperature for 5h under 360nm ultraviolet light irradiation. After the reaction is completed, the dichloromethane is removed by rotary evaporation of the reaction solution to obtain a tung oil-based polyol; the molar ratio between the double bonds in the tung oil and the mercapto groups in the thioglycerol is 1:1.05.
[0040] (2) 16.8 g of tung oil-based polyol prepared in step (1), 22.1 g of isocyanoethyl methacrylate and 0.02 g of polymerization inhibitor hydroquinone were added to the reaction kettle, and the reaction was stirred at 45 °C for half a time. After one hour, 0.04 g of catalyst dibutyltin dilaurate was added, and the temperature was raised to 60° C....
Embodiment 3
[0043] A preparation method of a multifunctional linseed oil-based hyperbranched photocurable prepolymer, comprising the following steps:
[0044] (1) 9.24g of linseed oil, 6.47g of thioglycerol and 0.47g of 2-hydroxy-2-methylpropiophenone were added to the reaction kettle, diluted with 15g of dichloromethane, and the reaction was stirred at room temperature for 5h under 360nm ultraviolet light irradiation , after the reaction is completed, the reaction solution is rotary evaporated to remove dichloromethane to obtain a linseed oil-based polyol; the molar ratio between the double bond in the vegetable oil and the thiol group in the thioglycerol is 1:1.05.
[0045] (2) 15.4 g of linseed oil-based polyol prepared in step (1), 16.8 g of isocyanoethyl methacrylate and 0.02 g of polymerization inhibitor hydroquinone were added to the reaction kettle, and the reaction was stirred at 45 °C After half an hour, 0.03 g of catalyst dibutyltin dilaurate was added, and the temperature was ra...
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