Refining method of epoxy resin

A technology of epoxy resin and refining method, applied in the field of chemical refining, can solve the problems of increasing the production cost of epoxy resin, generating epoxy pressure, etc., to reduce production processing cost and raw material consumption, reduce organic content, and avoid excessive condensation. Effect

Active Publication Date: 2021-08-13
JIANGSU KUMHO YANGNONG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, in the process of refining and purifying crude epoxy resin, the method of dehydrochlorination of NaOH with high volume and low concentration under normal pressure is generally adopted, but this method will inevitably produce a certain amount of aged resin. 1 ton of epoxy resin produces about 3-5Kg of aging resin
As a high molecular polymer, aging resin is insoluble in general solvents and water. Manufacturers need to treat it as solid waste, which increases the production cost of epoxy resin while generating epoxy pressure.

Method used

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  • Refining method of epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Take 1000g of crude resin after removing epichlorohydrin, and measure its hydrolyzable chlorine content by GB / T4618.2-2008 saponifiable chlorine content detection method to be 16250ppm, wherein: the quality of the NaCl contained is 360g, the epoxy contained The quality of resin is 640g;

[0062] According to the ratio of the total amount of substance of sodium hydroxide and the amount of substance of the chloride ion in the hydrolyzable chlorine in the described thick epoxy resin, be 1.2:1, calculate the consumption 14.3g of required sodium hydroxide, therefore, get 14.3 g sodium hydroxide is made into mass concentration and is 28.6g of 50% sodium hydroxide solution;

[0063] (1) 1000g thick resin and 430g toluene are mixed and heated up to 90°C, then add 1.2g benzyltriethylammonium chloride (mass fraction 50%) to obtain a mixed solution; the mass of the thick resin in the mixed solution The content is 60%;

[0064] (2) Mix the mixed solution obtained in the step (1) ...

Embodiment 2

[0074] Take 1000g of the crude resin after removal of epichlorohydrin, and measure its hydrolyzable chlorine content by GB / T4618.2-2008 saponifiable chlorine content detection method to be 184670ppm, wherein: the quality of the NaCl contained is 360g, and the epoxy The mass of resin is 634g;

[0075] According to the ratio of the total substance amount of sodium hydroxide and the amount of substance of the chloride ion in the hydrolyzable chlorine in the described thick epoxy resin, be 1.15:1, calculate the consumption 15.6g of required sodium hydroxide, therefore, get 15.6 gNaOH is made into mass concentration and is 31.2g of 50% sodium hydroxide solution;

[0076] (1) After mixing 1000g of crude resin and 640g of toluene, heat up to 90°C, then add 10g of polyethylene glycol 200 (50% by mass fraction) to obtain a mixed solution; the mass content of the crude resin in the mixed solution is 60% ;

[0077] (2) Mix the mixed solution obtained in the step (1) with 12.4 g of 50% ...

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Abstract

The invention provides a refining method of epoxy resin, and belongs to the field of chemical refining. In the staged refining process, the content of water in a system is reduced by pumping negative pressure to a certain vacuum degree and removing water and an organic solvent in the system, so that the reaction is promoted to proceed towards a crude epoxy resin dehydrochlorination ring-closure reaction, the content of hydrolyzable chlorine in the crude epoxy resin is remarkably reduced, by using a phase transfer catalyst and controlling the vacuum degree and temperature of each refining stage, the utilization rate of sodium hydroxide participating in ring-closure reaction is increased, and the use amount of sodium hydroxide is reduced, so that excessive condensation side reaction is avoided, the generation of aged resin is reduced, the content of organic matters in the generated high-salinity wastewater is reduced, and the production treatment cost and raw material consumption are reduced; and the TOC value in the generated high-salinity wastewater is as low as 3434ppm, the aged resin accounts for 0.8% o of the total amount of the resin, and the content of hydrolyzable chlorine in the epoxy resin product is as low as 142 ppm.

Description

technical field [0001] The invention relates to the field of chemical refining, in particular to a method for refining epoxy resin. Background technique [0002] Epoxy resin is a general term for a class of polymers containing more than two epoxy groups in the molecule, and is a polycondensation product of epichlorohydrin and polyols. Compared with other thermosetting plastics, epoxy resin has excellent physical, mechanical and electrical insulation properties, can be bonded to various materials, and its use process is flexible. Therefore, it can be made into coatings, composite materials, casting materials, adhesives, molding materials and injection molding materials, and is widely used in various fields of the national economy. Moreover, the hydrolyzable chlorine content is a very important characteristic index of the epoxy resin, and the level of the hydrolyzable chlorine content directly affects the curing behavior of the epoxy resin and the performance of the cured pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/02
CPCC08G59/025Y02W30/62
Inventor 孙祥俞孝伟马良杨堃杨健陈铭铸杨颖
Owner JIANGSU KUMHO YANGNONG CHEM CO LTD
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