Preparation and degradation method of thermosetting epoxy resin capable of being degraded by gamma-ray irradiation
An epoxy resin and γ-ray technology, applied in the preparation of sulfide, organic chemistry, plastic recycling, etc., can solve the problems of difficulty in taking into account excellent performance and degradation performance, and harsh conditions for degradation methods, and achieve super penetrating, Low cost and zero energy consumption
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Embodiment 1
[0026] Embodiment 1: the preparation of curing agent 1
[0027]
[0028] Curing agent Ι
[0029] In 500mLTHF, add 12.51g of p-aminothiophenol, 13.21g of 4-vinylbenzaldehyde and 1mol% of 2,2-dimethoxy-2-phenylacetophenone (DMPA), after the dissolution is complete, the The mixed solution was irradiated under a 365 nm ultraviolet lamp, stirred at room temperature for 60 min, and then the solvent was removed in vacuo to obtain a crude product. 32.13g of the crude product and 19.14g of isophthalic acid dihydrazide were dissolved in methanol, and after reacting at 50°C for 5h, a white precipitate precipitated out. The precipitate was washed three times successively with water, methanol and water, and dried in vacuum to obtain pure curing agent 1 with a yield of 70%.
[0030] 1 H-NMR(d-DMSO):11.58(s,2H),8.50(s,1H),7.75(m,4H),7.31(m,6H),6.67(d,2H),5.50(s,4H) ,3.12(m,4H),2.95(m,4H)
Embodiment 2
[0031] Embodiment 2: the preparation of curing agent II
[0032]
[0033] Curing agent Ⅱ
[0034] In 500mLTHF, add 12.51g of p-aminothiophenol, 13.21g of 4-vinylbenzaldehyde and 1mol% of 2,2-dimethoxy-2-phenylacetophenone (DMPA), after the dissolution is complete, the The mixed solution was irradiated under a 365 nm ultraviolet lamp, stirred at room temperature for 60 min, and then the solvent was removed in vacuo to obtain a crude product. Take 32.13g of the crude product and 17.42g of adipic acid dihydrazide and dissolve them in water. After reacting at 50°C for 5h, a white precipitate precipitates out. The precipitate was washed three times successively with water, methanol and water, and the pure curing agent II was obtained after vacuum drying with a yield of 72%.
[0035] 1 H-NMR(d-DMSO):11.07(s,2H),8.47(s,2H),7.82(d,4H),7.35(m,8H),6.67(m,4H),5.49(s,4H) ,3.12(m,4H),2.95(m,4H),2.34(m,4H),1.53(m,4H)
Embodiment 3
[0036] Embodiment 3: the preparation of curing agent III
[0037]
[0038] Curing agent Ⅲ
[0039] In 500mLTHF, add 12.51g of p-aminothiophenol, 13.21g of 4-vinylbenzaldehyde and 1mol% of 2,2-dimethoxy-2-phenylacetophenone (DMPA), after the dissolution is complete, the The mixed solution was irradiated under a 365 nm ultraviolet lamp, stirred at room temperature for 60 min, and then the solvent was removed in vacuo to obtain a crude product. Take 32.13g of the crude product and 18.46g of O,O'-1,3-propanediylbishydroxylamine dihydrochloride and dissolve them in water. After reacting at 50°C for 5h, a white precipitate precipitates out. The precipitate was washed three times successively with water, ethanol and water, and dried in vacuum to obtain pure curing agent III with a yield of 72%.
[0040] 1 H-NMR(d-DMSO):8.44(s,2H),7.82(d,4H),7.38(m,4H),6.67(m,4H),5.20(s,4H),3.51(m,4H) ,3.12(m,4H),2.95(m,4H),1.79(m,4H)
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