Synthesis method of high-biomass multi-arm photosensitive prepolymer
A synthesis method and prepolymer technology, applied in polyurea/polyurethane adhesives, adhesive types, polyurea/polyurethane coatings, etc., can solve the problem that photosensitive prepolymers cannot achieve performance alone and limit a wide range of applications, etc. problems, to achieve good stability, controllable number of arms, and high bio-based content
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Embodiment 1
[0017] Add 22.23g of isophordione diisocyanate into a four-necked flask equipped with a magnetic stirrer, a thermometer and a condenser, keep the reaction temperature at 35°C, and drop in 33.00g of cardanol and 0.01g of catalyst with a dropping funnel The mixture of dibutyltin dilaurate is reacted until the NCO content reaches the theoretical value (measured by di-n-butylamine back titration), which is the cardanol semi-blocked prepolymer.
[0018] Add the semi-blocked prepolymer dropwise to a reactor containing 5.99g of sucrose and 40g of N,N-dimethylformamide, keep the reaction temperature at 55°C, and stir the reaction until no NCO is detected in the infrared spectrum. The characteristic absorption peak of the group can obtain the multi-arm prepolymer with high biological content.
[0019] Add 30.37g of m-chloroperoxybenzoic acid and 100ml of dichloromethane to the multi-armed prepolymer, use an ice bath to stir and react at 0°C for 3h, then wash the reaction solution with ...
Embodiment 2
[0022] Add 17.42g of 2,4-toluene diisocyanate into a four-necked flask equipped with a magnetic stirrer, a thermometer and a condenser, keep the reaction temperature at 55°C, and drop in 39.00g of cardanol and 0.06g of catalyst with a dropping funnel The mixture of dibutyltin dilaurate is reacted until the NCO content reaches a theoretical value (measured by di-n-butylamine back titration), and the reaction is stopped to obtain a cardanol semi-capped prepolymer.
[0023] The semi-capped prepolymer was dropped dropwise into a four-necked round-bottomed flask reactor equipped with 4.80g of triglycerol and 57.44g of butyl acetate, and the reaction temperature was kept at 80°C, and the reaction was stirred until the infrared spectrum detected no When the NCO group characteristic absorption peak is reached, a multi-arm prepolymer with high biological content can be obtained.
[0024] Add 67.30g of m-chloroperoxybenzoic acid and 200ml of dichloromethane to the multi-armed prepolymer...
Embodiment 3
[0027] Add 16.81g of hexamethylene diisocyanate into a four-neck flask equipped with a magnetic stirrer, a thermometer and a condenser tube, keep the reaction temperature at 45°C, and drop in 33.00g of cardanol and 0.03g of triethylamine as a catalyst with a dropping funnel The mixture is reacted until the NCO content reaches the theoretical value (measured by di-n-butylamine back titration method), and the reaction is stopped to obtain the cardanol semi-capped prepolymer.
[0028] Put the semi-capped prepolymer dropwise into a four-necked round-bottomed flask reactor equipped with 1.66g of glycerin and 80g of ethyl acetate / butyl acetate mixed solvent, keep the reaction temperature at 65°C, and stir until the infrared No characteristic absorption peak of the NCO group can be detected in the spectrum, that is, a multi-armed prepolymer with high biological content is obtained.
[0029] Add 4.05g of formic acid to the multi-armed prepolymer, after heating to 50°C, add 20.95g of 5...
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