Epoxy resin curing agent capable of improving anti-ultraviolet performance of epoxy resin and preparation method for epoxy resin curing agent

An epoxy resin curing and anti-ultraviolet technology, which is applied in the field of materials, can solve the problems that the anti-ultraviolet performance of epoxy resin cannot achieve good results, reduce the anti-ultraviolet performance of materials, and poor anti-ultraviolet performance, so as to improve the anti-ultraviolet performance, Improve the anti-ultraviolet performance and reduce the effect of external migration

Active Publication Date: 2016-10-12
CHINA ENERGY CONSTR GRP SHAANXI ELECTRIC POWER DESIGN INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these types of small molecule UV absorbers are easy to vaporize, volatilize, and be extracted by solvents so that they migrate to the surface of the material for loss, thereby reducing the UV resistance of the material and reducing the service life of the material
However, ordinary epoxy resin has the characteristics of being easily destroyed by absorbing ultraviolet rays becaus

Method used

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  • Epoxy resin curing agent capable of improving anti-ultraviolet performance of epoxy resin and preparation method for epoxy resin curing agent
  • Epoxy resin curing agent capable of improving anti-ultraviolet performance of epoxy resin and preparation method for epoxy resin curing agent
  • Epoxy resin curing agent capable of improving anti-ultraviolet performance of epoxy resin and preparation method for epoxy resin curing agent

Examples

Experimental program
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Example Embodiment

[0021] Example 1

[0022] 1) Synthesis of 2-hydroxy-4-(2,3-oxirane glycidyl ether)-benzophenone (HEPBP) as a UV absorber molecule

[0023] Add 21.49 grams (0.1mol) of 2,4-dihydroxybenzophenone (UV-0) and 46.25 grams (0.5mol) of epichlorohydrin to a 250mL three-necked flask with a stirring motor, thermometer and reflux condenser , Heat to 88℃, add 9.6 grams of 50% sodium hydroxide aqueous solution (the content of sodium hydroxide is 0.12mol) into the three-necked flask, stir vigorously, and then continue to stir and react for 2h at a constant temperature of 88℃ After the reaction, the product was repeatedly washed with hot water at 60°C, and dried with anhydrous sodium sulfate for half an hour, then the excess epichlorohydrin in the product was evaporated under reduced pressure, and finally recrystallized with ethanol to obtain light yellow needle-like crystals. It is the ultraviolet absorber molecule 2-hydroxy-4-(2,3-oxirane glycidyl ether)-benzophenone (HEPBP), the yield is 58.4%...

Example Embodiment

[0033] Example 2

[0034] 1) Synthesis of 2-hydroxy-4-(2,3-oxirane glycidyl ether)-benzophenone (HEPBP) as a UV absorber molecule

[0035] Add 2,4-dihydroxybenzophenone and epichlorohydrin to a three-necked flask with a stirring motor, thermometer and reflux condenser according to a molar ratio of 0.5:1. Heat to 85°C, and drop into the three-necked flask. Add 40% sodium hydroxide aqueous solution (wherein the molar ratio of sodium hydroxide to 2,4-dihydroxybenzophenone is 1:1), stir vigorously, and then continue to stir and react for 3 hours at a constant temperature of 85°C. After the reaction, the product was repeatedly washed with hot water at 65°C, and dried with anhydrous sodium sulfate for half an hour, then the excess epichlorohydrin in the product was evaporated under reduced pressure, and finally recrystallized with ethanol to obtain light yellow needle-like crystals, namely It is the ultraviolet absorber molecule 2-hydroxy-4-(2,3-oxirane glycidyl ether)-benzophenone (HEP...

Example Embodiment

[0038] Example 3

[0039] 1) Synthesis of 2-hydroxy-4-(2,3-oxirane glycidyl ether)-benzophenone (HEPBP) as a UV absorber molecule

[0040] Add 2,4-dihydroxybenzophenone and epichlorohydrin to a three-necked flask with a stirring motor, a thermometer and a reflux condenser according to a molar ratio of 0.1:1. Heat to 90℃ and drop into the three-necked flask. Add 20% mass fraction of sodium hydroxide aqueous solution (the molar ratio of sodium hydroxide to 2,4-dihydroxybenzophenone is 0.5:1), stir vigorously, and then continue to stir and react for 0.5h at a constant temperature of 90°C After the reaction, the product was repeatedly washed with hot water at 70°C, and then dried with anhydrous sodium sulfate for half an hour, then the excess epichlorohydrin in the product was evaporated under reduced pressure, and finally recrystallized with ethanol to obtain light yellow needle-like crystals. It is the ultraviolet absorber molecule 2-hydroxy-4-(2,3-oxirane glycidyl ether)-benzopheno...

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Abstract

The invention provides an epoxy resin curing agent capable of improving the anti-ultraviolet performance of epoxy resin and a preparation method for the epoxy resin curing agent. The epoxy resin curing agent is obtained by reacting ultraviolet adsorbent molecules 2-hydroxy-4-(2,3-ethylene oxide glycidyl ether)-diphenyl ketone with diethylenetriamine, and the molecular structure of the epoxy resin curing agent is formed by connecting at least one ultraviolet adsorbent molecule 2-hydroxy-4-(2,3-ethylene oxide glycidyl ether)-diphenyl ketone to each diethylenetriamine molecule. After the epoxy resin is cured by the prepared epoxy resin curing agent, the anti-ultraviolet performance of the cured epoxy resin can be improved, and the weather resistance of the epoxy resin is improved.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to an epoxy resin curing agent with improved anti-ultraviolet performance of epoxy resin and a preparation method thereof. Background technique [0002] Ultraviolet absorbers (UVA) are a class of organic compounds that can selectively and strongly absorb solar ultraviolet rays that are harmful to polymers and have high light resistance. There are many types of compounds with this property, including o-hydroxybenzophenone Ketones, o-hydroxybenzotriazoles, o-hydroxybenzotriazines, salicylates, benzoates, cinnamates, oxalanilides, etc. Since practical light stabilizers need to meet other performance requirements in many aspects at the same time, the main o-hydroxy aromatic compounds such as benzophenone and benzotriazole are currently used in industry. However, these types of small molecule UV absorbers are easy to vaporize, volatilize, and be extracted by solvents so that they mi...

Claims

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Application Information

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IPC IPC(8): C08G59/64C07D301/28C07D303/26
CPCC07D301/28C07D303/26C08G59/64
Inventor 刘俊峰谭蓉胡清廷许子智马钦国曾健周海宏
Owner CHINA ENERGY CONSTR GRP SHAANXI ELECTRIC POWER DESIGN INST CO LTD
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