Self-monitoring polyurethane as well as preparation method and application thereof
A self-monitoring, polyurethane technology, applied in polyurea/polyurethane coatings, coatings, luminescent coatings, etc., can solve problems such as crack growth and coating damage, and achieve low preparation costs, ensure safety, and facilitate identification.
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Embodiment 1
[0024] This embodiment provides a preparation method of self-monitoring acrylate, the preparation method is as follows:
[0025] ①Add excess dihydroxylated tetraphenylethylene in 1,6-dibromohexane at a constant temperature of 120°C and K 2 CO 3 React under catalysis for 10-15 hours. After the reaction is completed, use silica gel column chromatography to separate and purify to obtain a self-monitoring diol. The general structural formula of the self-monitoring diol is as follows: figure 1 .
[0026] ② Weigh 80 parts of self-detecting diol and 20 parts of glycerol according to the mass fraction, and mix and prepare monomer mixture A.
[0027] ③Stir at 70°C, add the catalyst N,N-dimethylcyclohexylamine into the mixture A, stir evenly, and obtain the mixture B, in which, the addition amount of N,N-dimethylcyclohexylamine is 0.1 part.
[0028] ④Put the mixture B in an oil bath, heat up to 110°C, then add isophorone diisocyanate into the mixture B, and stir evenly, keep the oil...
Embodiment 2
[0030] This embodiment provides a preparation method of self-monitoring acrylate, the preparation method is as follows:
[0031] ①Add excess dihydroxylated tetraphenylethylene to 1,10 dibromodecane at a constant temperature of 115°C and K 2 CO 3 React under catalysis for 10-15 hours. After the reaction is completed, use silica gel column chromatography to separate and purify to obtain self-monitoring diol.
[0032] ② Weigh 80 parts of self-detecting diol and 20 parts of glycerol according to the mass fraction, and mix and prepare monomer mixture A.
[0033] ③Stir at 70°C, add catalyst triethanolamine into mixture A, stir evenly to obtain mixture B, wherein the amount of triethanolamine added is 0.3 parts.
[0034] ④Put the mixture B in an oil bath, heat up to 112°C, then add hexamethylene diisocyanate into the mixture B, and stir evenly, keep the oil bath temperature at 112°C for 25 minutes, then transfer it to the mold, place it at 170 ℃ curing in an oven for 4.5 hours to ...
Embodiment 3
[0036] This embodiment provides a preparation method of self-monitoring acrylate, the preparation method is as follows:
[0037] ①Add excess dihydroxylated tetraphenylethylene to 1,12-dibromododecane at a constant temperature of 110°C and K 2 CO 3 React under catalysis for 10-15 hours. After the reaction is completed, use silica gel column chromatography to separate and purify to obtain self-monitoring diol.
[0038] ② Weigh 80 parts of self-detecting diol and 20 parts of glycerol according to the mass fraction, and mix and prepare monomer mixture A.
[0039] ③Stir at 65°C, add the catalyst dibutyltin dilaurate into the mixture A, and stir evenly to obtain the mixture B, wherein the added amount of dibutyltin dilaurate is 0.5 parts.
[0040] ④Put mixture B in an oil bath, heat up to 113°C, then add 2,4-toluene diisocyanate into mixture B, and stir evenly, keep the oil bath temperature at 113°C for 20 minutes, then transfer to the mold, place in Cured in an oven at 160°C for...
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