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A kind of epoxy resin curing agent with improved anti-ultraviolet performance of epoxy resin and preparation method thereof

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 reduce the service life of materials, so as to improve the anti-ultraviolet light performance, improved UV resistance, improved weather resistance

Active Publication Date: 2018-09-04
CHINA ENERGY CONSTR GRP SHAANXI ELECTRIC POWER DESIGN INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 because of its molecular chain, so its UV resistance is poor and it is easy to pulverize, which leads to many restrictions on the use of epoxy resin as a coating.
And using the existing epoxy resin curing agent to cure the epoxy resin, the improvement of the anti-ultraviolet performance of the cured epoxy resin cannot achieve a good effect, which affects the application range of the epoxy resin

Method used

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  • A kind of epoxy resin curing agent with improved anti-ultraviolet performance of epoxy resin and preparation method thereof
  • A kind of epoxy resin curing agent with improved anti-ultraviolet performance of epoxy resin and preparation method thereof
  • A kind of epoxy resin curing agent with improved anti-ultraviolet performance of epoxy resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0023] Add 21.49 grams (0.1mol) of 2,4-dihydroxybenzophenone (UV-0) and 46.25 grams (0.5mol) of epichlorohydrin into a 250mL three-necked flask equipped with a stirring motor, a thermometer and a reflux condenser , heated to 88°C, 9.6 grams of 50% sodium hydroxide aqueous solution (the content of sodium hydroxide in which is 0.12mol) was added dropwise to the three-necked flask, stirred vigorously, and then kept stirring at a constant temperature of 88°C for 2h After the reaction, the product was repeatedly washed with hot water at 60°C, dried with anhydrous sodium sulfate for half an hour, and then 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-hydroxyl-4-(2,3-ethylene oxide glycidyl ether)-benzophenone (HEPB...

Embodiment 2

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

[0035] Add 2,4-dihydroxybenzophenone and epichlorohydrin at a molar ratio of 0.5:1 into a three-necked flask equipped with a stirring motor, a thermometer and a reflux condenser, heat to 85°C, and drop into the three-necked flask Add a 40% aqueous solution of sodium hydroxide (the molar ratio of sodium hydroxide to 2,4-dihydroxybenzophenone is 1:1), stir vigorously, and then continue to stir and react at a constant temperature of 85°C for 3h, After the reaction, the product was repeatedly washed with hot water at 65°C, dried with anhydrous sodium sulfate for half an hour, and then 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-hydroxyl-4-(2,3-ethylene oxide glycidyl ether)-benzophenone (HEPBP).

[0036] ...

Embodiment 3

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

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

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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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Patent Type & Authority Patents(China)
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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