A kind of polyurethane containing naphthalene ring structure and its preparation method
A polyurethane and naphthalene ring technology, applied in the field of polyurethane, can solve the problems of insufficient hydrogen bonding in rigid segments and the decline in mechanical properties of polyurethane, and achieve the effect of improved mechanical properties and simple preparation methods
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Embodiment 1
[0037] Add 10g of 1,5-naphthalene diisocyanate and 5.81g of ethanolamine into 100ml of N,N-dimethylformamide, continue to stir and react at room temperature for 0.5h, filter with suction and dry to obtain a hydroxyl-terminated naphthalene ring chain extender.
[0038] Characterized by H NMR spectrum, the NMR data are as follows:
[0039] δ / ppm=3.16-3.25(m,2H),3.45-3.58(m,2H),4.76-4.84(m,2H),6.71-6.79(m,2H),7.39-7.48(m,2H),7.71 -7.77(d,J=8.55Hz,2H),7.99-8.05(d,J=7.77Hz,2H),8.55(s,2H).
[0040] The product obtained is of formula I:
[0041]
[0042] 4g polytetrahydrofuran ether glycol (molecular weight is 650), 2.07g hexamethylene diisocyanate is added in 30g N, N-dimethylformamide, and drop 3-5 dibutyltin dilaurate catalyst, at 65 Reaction at ℃ for 4h.
[0043] Measure the content of -NCO in the above system, add a hydroxyl-terminated naphthalene ring chain extender whose amount of -NCO is 1 / 2, raise the temperature to 80°C, and continue the reaction for 2 hours.
[0044...
Embodiment 2
[0047] Add 10g of 1,5-naphthalene diisocyanate and 7.14g of ethanolamine into 100ml of N,N-dimethylacetamide, continue to stir and react at room temperature for 0.5h, filter with suction and dry to obtain a hydroxyl-terminated naphthalene ring chain extender.
[0048] The obtained product is as formula II
[0049]
[0050] Add 6.2g of polytetrahydrofuran ether glycol (molecular weight is 1000), 2.07g of hexamethylene diisocyanate into 30g of N,N-dimethylformamide, and drop 3-5 drops of dibutyltin dilaurate catalyst, at 65 Reaction at ℃ for 4h.
[0051] Measure the content of -NCO in the above system, add a hydroxyl-terminated naphthalene ring chain extender whose amount of -NCO is 1 / 2, raise the temperature to 80°C, and continue the reaction for 2 hours.
[0052]Add the above reactants into methanol to precipitate the product, filter the product, dissolve it in an appropriate amount of N.N-dimethylformamide, pour the solution into a mold, dry and form it to obtain a polyur...
Embodiment 3
[0055] Add 10g of 1,5-naphthalene diisocyanate and 5.81g of ethanolamine into 100ml of dimethyl sulfoxide, continue to stir and react at room temperature for 0.5h, filter with suction and dry to obtain a hydroxyl-terminated naphthalene ring chain extender, as shown in formula III:
[0056]
[0057] Add 12.3g of polytetrahydrofuran ether diol (molecular weight: 2000), 2.73g of isophorone diisocyanate into 30g of dimethyl sulfoxide, and drop 3-5 drops of dibutyltin dilaurate catalyst, react at 65°C for 4h .
[0058] Measure the content of -NCO in the above system, add a hydroxyl-terminated naphthalene ring chain extender whose amount of -NCO is 1 / 2, raise the temperature to 80°C, and continue the reaction for 2 hours.
[0059] Add the above-mentioned reactants into methanol to precipitate the product, filter the product, dissolve it in an appropriate amount of N,N-dimethylformamide, pour the solution into a mold, dry and form it to obtain a polyurethane polymer film containin...
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