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Water-borne phenolic epoxy resin emulsion and preparation method thereof

A novolac epoxy resin, water-based technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve the problems of full water-based novolac epoxy resin, many functional groups, large molecular hindrance, etc., to achieve excellent adhesion, color and luster Shallow, stable and good effect

Inactive Publication Date: 2010-12-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The problem in the prior art to be solved by the present invention is that, for novolac epoxy resin, which has many functional groups and large molecular hindrance, it is difficult to make novolac epoxy resin fully water-based by adding emulsifier or chemical modification alone. Provide a water-based epoxy novolac resin emulsion that has been fully water-based

Method used

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  • Water-borne phenolic epoxy resin emulsion and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038] A kind of raw material formula of water-based novolac epoxy resin emulsion is:

[0039] Bisphenol A Novolak Epoxy Resin 30g

[0040] Dioxane 10g

[0041] p-aminobenzoic acid 4g

[0042] Sodium Lauryl Sulfate SDS 5g

[0043] Ethanolamine 2g

[0044] Distilled water 30g

[0045]During preparation, the bisphenol A type novolak epoxy resin (epoxy equivalent is 220g / eq) and dioxane in the material formula are added to the 500mL reaction kettle equipped with stirring device, condensation device, thermometer and dry nitrogen system In the process, heat until the bisphenol A novolak epoxy resin is completely dissolved, raise the temperature to 85°C, add p-aminobenzoic acid, react for 60h, add the surfactant sodium dodecyl sulfate SDS for auxiliary emulsification, cool down to 40°C, Add neutralizing agent ethanolamine, under high-speed stirring (2000rpm) condition, slowly add distilled water and carry out phase inversion in 2min, make aqueous novolac epoxy resin emulsion, i...

Embodiment 2

[0051] A kind of raw material formula of water-based novolac epoxy resin emulsion is:

[0052] O-methyl novolac epoxy resin 35g

[0053] Dioxane 15g

[0054] Thioglycolic acid 3g

[0055] Octylphenol Ethoxylate X-405 3g

[0056] 2-Dimethylamino-2-methyl-1-propanol 4g

[0057] Distilled water 30g

[0058] During preparation, the o-methyl novolac epoxy resin (epoxy equivalent is 210g / eq) and dioxane in the material formula are added to the 500mL reactor equipped with stirring device, condensation device, thermometer and dry nitrogen system , heat until it is completely dissolved, raise the temperature to 100°C, add thioglycolic acid to react for 4 hours, add surfactant octylphenol polyoxyethylene ether X-405 for auxiliary emulsification, cool down to 60°C, add neutralizing agent 2-dimethyl Amino-2-methyl-1-propanol, under the condition of high-speed stirring (2000rpm), slowly add distilled water and carry out phase inversion in 2min, make aqueous novolak epoxy resin emulsio...

Embodiment 3

[0060] A kind of raw material formula of water-based novolac epoxy resin emulsion is:

[0061] Bisphenol A Novolak Epoxy Resin 40g

[0062] Dioxane 18g

[0063] p-aminobenzoic acid 5g

[0064] Nonylphenol polyoxyethylene ether NP-10 3g

[0065] N,N-Dimethylethanolamine 3g

[0066] Distilled water 50g

[0067] During preparation, the bisphenol A type novolak epoxy resin (epoxy equivalent is 220g / eq) and dioxane in the material formula are added to the 500mL reaction kettle equipped with stirring device, condensation device, thermometer and dry nitrogen system In the medium, heat until it is completely dissolved, then raise the temperature to 95°C, add p-aminobenzoic acid to react for 10 hours, add surfactant nonylphenol polyoxyethylene ether NP-10 for auxiliary emulsification, cool down to 60°C, add neutralizing agent N , N-dimethylethanolamine, under high-speed stirring (2000rpm) condition, slowly distilled water carries out phase inversion in 2min, makes aqueous novolak ...

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Abstract

The invention discloses a water-borne phenolic epoxy resin emulsion and a preparation method thereof. The raw material formula of the water-borne phenolic epoxy resin emulsion is as follows in percentage by weight: 20-50% of phenolic epoxy resin, 2-12% of modifier, 3-50% of organic solvent, 20-50% of distilled water, 2-5% of neutralizer and 1-5% of surfactant. The preparation method is implemented as follows: adding the phenolic epoxy resin in an organic cosolvent, heating and dissolving, dropwise adding the modifier, reacting for 2-60h to obtain a modified phenolic epoxy resin, cooling to 30-60 DEG C, adding the surfactant for assisting emulsification, adopting the neutralizer to neutralize the obtained modified phenolic epoxy resin to have the pH value of 6-7, and adding the distilled water for realizing phase reversal under the stirring condition to obtain the water-borne phenolic epoxy resin emulsion. By the above technical scheme, the invention can provide the water-borne phenolic epoxy resin emulsion with good paint film property and low production cost, which can be used as a basic raw material of an environment-friendly material.

Description

technical field [0001] The present invention relates to novolak epoxy resin emulsion, particularly relate to a kind of water-based novolak epoxy resin emulsion and preparation method thereof; Specifically relate to a kind of self-emulsification and add emulsifier method to combine so as to obtain the method of water-based novolak epoxy resin emulsion, the Emulsions can be used as basic raw materials for the preparation of water-based paints and other environmentally friendly materials. Background technique [0002] Epoxy resin is widely used in chemical industry, electronic power, machinery, aerospace, coating, bonding and other fields due to its good mechanical properties, excellent insulation properties, high adhesion, small shrinkage, good stability and easy processing. . However, traditional epoxy resins have the disadvantages of poor fatigue resistance, heat resistance, impact resistance, crack resistance, and heat and humidity resistance, making it difficult to meet t...

Claims

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Application Information

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IPC IPC(8): C08L63/04C08G59/16C08J3/03C09D163/04
Inventor 文秀芳林炜创皮丕辉蔡智奇程江杨卓如
Owner SOUTH CHINA UNIV OF TECH
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