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Bisphenol A liquid epoxy resin refining method

A technology of liquid epoxy resin and refining method, which is applied in the field of fine chemical production, can solve the problems of unfavorable clean production, epoxy pollution, increase of production cost, etc., and achieve good condition of water washing and liquid separation, reduction of total waste water, and reduction of consumption Effect

Active Publication Date: 2012-12-12
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain high-purity epoxy resin with low organic chlorine, the above improved technology needs to add a large amount of alkali in the post-treatment refining process, and the excessive alkali needs a large amount of pure water to wash to neutrality, resulting in a large amount of waste water, causing epoxy pollution, not Conducive to clean production, while increasing production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 200g of CYD-128 crude resin and 260g of toluene into a four-neck flask, add 12.6g of NaOH solution, react at 60-89°C for 2h, then add 1g of glycerol, 20g of NaOH solution, react at 60-89°C for 3h, and react at 75°C Add 60g of analytical water and 120g of pure water to wash and separate the liquid, then add 60g of analytical water to wash, add 100g of pure water to wash after the liquid separation, and remove the organic solvent in the resin after the liquid separation to obtain the epoxy resin. The product indicators are as follows: epoxy equivalent: 185.4g / ep, organochlorine: 0.026%, viscosity (25°C): 11600mpa.s.

Embodiment 2

[0016] Add 200g CYD-127 crude resin and 300g benzene into a four-neck flask, add 10.6g NaOH solution, react at 60-90°C for 1.5h, add 1.2g sodium stearate, 17.6g NaOH solution, React for 3.5 hours, add 80g of deionized water and 100g of pure water to wash at 70-80°C, add 75g of deionized water for washing after liquid separation, add 120g of pure water for washing after liquid separation, and remove the organic solvent in the resin after liquid separation. epoxy resin. The product indicators are as follows: epoxy equivalent: 181.4g / ep, organochlorine: 0.030%, viscosity (25°C): 9100mpa.s.

Embodiment 3

[0018] Add 250g of E-44 crude resin and 350g of methyl isobutyl ketone into a four-necked flask, add 15.6g of NaOH solution, react at 60-88°C for 1 hour, add 1.5 g of propylene glycol methyl ether, and add 12.6g of NaOH solution at 60-88°C React at 88°C for 3.5 hours, add 75g of deionized water and 100g of pure water at 75~85°C for washing, add 90g of deionized water for washing, add 150g of pure water for washing after liquid separation, and remove the organic solvent in the resin after liquid separation. Get epoxy resin. The product indicators are as follows: epoxy equivalent 210.4g / ep, organochlorine: 0.032%, softening point: 14.5.

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Abstract

The invention relates to a bisphenol A liquid epoxy resin refining process. The bisphenol A liquid epoxy resin refining process is characterized by including steps: feeding coarse epoxy resin, NaOH solution and solvent into a reaction kettle, stirring, heating to 60-100 DEG C, reacting for 1-4h, adding NaOH solution and promoter, reacting at 60-100 DEG C for 1-4h, washing with water for three times at 60-100 DEG C after reaction is completed, and subjecting filtrate to reduction vaporization for removing the solvent to obtain high-purity, low-chlorine and low-viscosity bisphenol A liquid epoxy resin. The bisphenol A liquid epoxy resin refining process has the advantages that reaction degree of hydrolysable chlorine on NaOH and coarse resin can be increased by adding the promoter under the low refining alkali condition, adding resolving water during water washing for neutralizing excess alkali can improve the skimming condition and reduce consumption of pure water, little 'three wastes' (waste water, waste gas and waste residues) are generated, production cost is low, products are high in transparency and purity and low in viscosity, and the bisphenol A liquid epoxy resin refining process has high application value.

Description

technical field [0001] The invention relates to a method for refining bisphenol A liquid epoxy resin, belonging to the technical field of fine chemical production. Background technique [0002] Bisphenol A liquid epoxy resin is the most common representative variety of epoxy resin. Its cured product has many excellent characteristics, such as high bonding strength, low shrinkage, good chemical resistance and electrical insulation. It is used in coatings. , Adhesives, composite materials, textiles and construction materials, etc. have a wide range of applications in various fields of the national economy. With the gradual expansion of the application of epoxy resin in high technology, the requirements for the performance of epoxy resin, such as heat resistance, weather resistance, high adhesion, corrosion resistance, etc., are constantly increasing, and the purity requirements of epoxy resin are also increasing. Higher and higher. [0003] Due to the complexity of the react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/06
Inventor 唐光斌任六波郝新兵
Owner CHINA PETROCHEMICAL CORP
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