Ultraviolet-cured biomass methacrylate and/or acrylate prepolymer and preparation method thereof
A technology of methacrylate and hydroxymethacrylate, applied in the field of ultraviolet light curing biomass methacrylate and/or acrylate prepolymer and its preparation, can solve the problem of reducing the mechanical properties and optical properties of the consolidated body , increase cost, poor flexibility and other problems, to achieve the effect of simple and controllable synthesis method, reducing use, increasing flexibility and rigidity
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Embodiment 1
[0032] 1. Mix 18.8g of m-xylylene diisocyanate and 0.16g of dibutyltin dilaurate, blow in nitrogen, keep the temperature at 5°C, and slowly add it dropwise to 13.0ml containing 30ml of DMF under magnetic stirring. g of hydroxybutyl methacrylate solution, the dropwise addition time is 1.5h, the dropwise addition is completed and reacted for 4h, and then the temperature is raised to 25° C., and reacted for 3h to obtain a prepolymer (I) of one-end-blocked diisocyanate.
[0033] 2. Mix 13.5g of cardanol, 10.9g of 4-chloro-1,3-butanediol and 30ml of absolute ethanol, and maintain the temperature at 70°C under magnetic stirring, and add dropwise 19g of 20% hydroxide by mass fraction Add sodium for 1 hour, react for 18 hours; cool, filter the precipitated salt, wash with distilled water, and distill ethanol and water under reduced pressure at 65°C to synthesize cardanol etherified diol (II).
[0034] 3. above-mentioned prepolymer (I) is mixed with 0.16g drop dibutyltin dilaurate, und...
Embodiment 2
[0036] 1. Mix 25.0g of diphenylmethylene diisocyanate and 0.16g of stannous octoate drops, pass nitrogen gas, keep the temperature at 0°C, and slowly add dropwise to 12.4g of 27ml of DMF under the condition of magnetic stirring The hydroxypropyl acrylate solution was added dropwise for 1 hour. After the dropwise addition, the reaction was carried out for 3 hours, and then the temperature was raised to 20° C., and the reaction was carried out for 4 hours to obtain a prepolymer (I) of diisocyanate blocked at one end.
[0037] 2. Mix 13.2g of cardanol, 10.2g of 4-chloro-1,3-butanediol and 32.1ml of absolute ethanol, under magnetic stirring, keep the temperature at 65°C, add dropwise 23.5g of 15 % sodium hydroxide, dropwise time is 0.5h, react for 20h; cool, filter the precipitated salt, wash with distilled water, distill ethanol and water under reduced pressure at 60°C to synthesize cardanol etherified diol (II).
[0038] 3. Mix the above-mentioned prepolymer (I) with 0.16g drops...
Embodiment 3
[0040] 1. Mix 26.2g of dicyclohexylmethane diisocyanate and 0.16g of bis(dodecylsulfide) dibutyltin, feed nitrogen, maintain the temperature at 10°C, and slowly Add dropwise to 11.7g of hydroxyethyl methacrylate solution containing 31ml of DMF for 2 hours. After the dropwise addition, react for 5 hours, then raise the temperature to 30°C and react for 2 hours to obtain a prepolymerized diisocyanate with one end blocked. Object (I).
[0041] 2. Mix 15.6g of cardanol, 13.3g of 4-chloro-1,3-butanediol and 31.9ml of absolute ethanol, under magnetic stirring, keep the temperature at 75°C, add dropwise 19.7g of 25% mass fraction Add sodium hydroxide for 1.5 hours, react for 15 hours; cool, filter the precipitated salt, wash with distilled water, and distill ethanol and water under reduced pressure at 70°C to synthesize cardanol etherified diol (II).
[0042] 3. Mix the above-mentioned prepolymer (I) with 0.16 drops of dibutyltin di(dodecylsulfide), under the state of magnetic stirr...
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