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Preparation method of waterborne epoxy resin emulsion

A technology of water-based epoxy resin and epoxy resin, which is applied in the direction of epoxy resin coatings and coatings, can solve problems such as inability to form, large emulsion particle size, and influence on paint film mechanical properties, and achieves easy implementation, simple method, considerable economic benefits

Inactive Publication Date: 2012-06-20
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reactive emulsifiers prepared by these two methods are polymeric emulsifiers with multiple surface active centers, and can only form horizontal adsorption when dispersing and emulsifying epoxy resins, but cannot form traditional micellar latex particles. The larger the diameter, the mechanical properties of the paint film will be affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method for reactive epoxy resin emulsion, it comprises the steps:

[0032] 1) Synthesis of Polyethylene Glycol Monomethyl Ether Epoxy Resin Emulsifier

[0033] In a four-necked flask with a water separator and a reflux condenser, add 20g of E-44 type epoxy resin, 54g of polyethylene glycol monomethyl ether (relative molecular mass 1200), and 57.85g of toluene, and heat up under magnetic stirring. Azeotropic dehydration was carried out at a temperature of 130-150°C for 3 hours to obtain a mixed liquid, and the temperature was lowered to 85°C, then a solution of 56.25 mg of boron trifluoride complex dissolved in 8.66 g of toluene was added to the above 131.85 g of the mixed liquid, nitrogen Reaction under protection, the epoxy retention rate of the analysis system is sampled every 0.5h during the reaction, when the epoxy retention rate reaches 50%, add water to destroy the catalyst to stop the reaction, decompression distillation to remove the solvent to obt...

Embodiment 2

[0046] A preparation method for reactive epoxy resin emulsion, it comprises the steps:

[0047] 1) Synthesis of Polyethylene Glycol Monomethyl Ether Epoxy Resin Emulsifier

[0048] In a four-necked flask with a water separator and a reflux condenser, add 20g of E-51 type epoxy resin, 64g of polyethylene glycol monomethyl ether (relative molecular mass: 1200), and 47.63g of toluene. Raise the temperature under magnetic stirring, azeotropic dehydration at a temperature of 130-150°C for three hours to obtain a mixed liquid, lower the temperature to 85°C, add a solution of 56.25 mg triphenylphosphine dissolved in 8.66 g toluene to the above mixed liquid, and protect it under nitrogen The next reaction. During the reaction, take samples every 0.5h to analyze the epoxy retention rate of the system. When the epoxy retention rate reaches 50%, add water to destroy the catalyst to stop the reaction, and distill the solvent under reduced pressure to obtain a colorless transparent viscou...

Embodiment 3

[0061] A preparation method for reactive epoxy resin emulsion, it comprises the steps:

[0062] 1) Synthesis of Polyethylene Glycol Monomethyl Ether Epoxy Resin Emulsifier

[0063] In a four-necked flask with a water separator and a reflux condenser, add 10g of E-44 epoxy resin, 45.3g of polyethylene glycol monomethyl ether (relative molecular mass about 2000) and 61.14g of toluene. Raise the temperature under magnetic stirring, azeotropic dehydration at a temperature of 130-150°C for three hours to obtain a mixed liquid, cool down to 90°C, and add a solution of 56.25mg of boron trifluoride complex in 8.66g of toluene to the above mixed liquid , reacted under nitrogen protection. During the reaction period, take samples every 0.5h to analyze the epoxy retention rate of the system. When the epoxy retention rate reaches about 50%, add water to destroy the catalyst to stop the reaction, and distill the solvent under reduced pressure to obtain a white solid, which is polyethylene...

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Abstract

The invention relates to a preparation method of a waterborne epoxy resin emulsion. The preparation method comprises the following steps: mixing bisphenol A epoxy resin, polyethylene glycol monomethyl ether and toluene, stirring, and performing azeotropic dehydration to get a mixed liquid; dissolving a catalyst in the toluene, then raising the temperature of the mixed liquid under magnetic stirring, reacting under the protection of nitrogen, and removing a solvent by reduced pressure evaporation when the retention rate of epoxy in the bisphenol A epoxy resin is reduced to 50%, thus getting a reactive non-ionic epoxy emulsifying agent; and dropwise adding distilled water while intensely stirring the liquid-state epoxy resin, a cosolvent and the reactive non-ionic epoxy emulsifying agent, thus getting the waterborne epoxy resin emulsion. The preparation method disclosed by the invention has the beneficial effects that the epoxy resin emulsion emulsified by the non-ionic waterborne epoxy resin emulsifying agent is good in stability, has no toxicity and zero content of organic volatile matters, is safe and environmentally-friendly, and can be used for maintaining the excellent chemical-resistant performance of the epoxy resin and simultaneously increasing the flexibility of a paint film.

Description

technical field [0001] The invention relates to the field of water-based paint, in particular to a preparation method of water-based epoxy resin emulsion. Background technique [0002] Epoxy resin is a thermosetting resin with good electrical insulation, chemical stability, adhesiveness, processability, etc. It is widely used in construction, machinery, electronics, aerospace and other fields. However, traditional epoxy resins can only be dissolved in organic solvents, and must be diluted with organic solvents during use. Such prepared epoxy coatings will inevitably cause harm to operators and the environment during use. In recent years, people have paid more and more attention to environmental protection. Many countries have successively promulgated laws and regulations to control volatile organic compounds (VOC), and the implementation standards have become more stringent. The development of environmentally friendly coatings with little or no organic volatile matter has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08G81/00C08G65/48C08G59/14C09D163/00
Inventor 官仕龙吴畏董桂芳胡登华匡启荣
Owner WUHAN INSTITUTE OF TECHNOLOGY
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