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High purity low molecule biphenol A epoxy resin synthetic process

A technology for epoxy resin and low molecular weight, applied in the field of synthesizing high-purity low-molecular-weight epoxy resin, can solve the problems of complex production process, difficulty in desalination, large amount of waste water, etc., and achieve simple production process, high product purity and low viscosity. Effect

Inactive Publication Date: 2004-11-17
QINGDAO DIC FINECHEM
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AI Technical Summary

Problems solved by technology

The above-mentioned production process is complicated, the reaction system has water participation and is very easy to emulsify (PTC effect), it is difficult to remove salt, the amount of waste water produced is large, the price of phase transfer catalyst is expensive, the process is long, the loss of materials is large, and the cost is high

Method used

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  • High purity low molecule biphenol A epoxy resin synthetic process

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Embodiment Construction

[0008] Bisphenol A 0.1mol, epichlorohydrin 1.0mol and K 2 CO 3 0.2 mol was put into the reaction kettle, stirred, and the temperature was raised to 110° C., and the reaction progress was monitored by gas chromatography for 3 hours, and the reaction was completed. The reaction was filtered and the filter cake was washed with a small amount of epichlorohydrin. The filter cake is KCl and KHCO 3 Mixtures that can be processed for reuse or other uses. Combine the filtrate and washing liquid, and distill under reduced pressure to remove excess epichlorohydrin (which can be recycled). When steaming until no more distilled out, add 50ml of toluene and continue vacuum distillation to remove residual epichlorohydrin, and the distillation substrate is the product. The Ep340 content of the epoxy resin obtained in this way is greater than 90%, which is higher than the products (the Ep340 content is about 80%) made by the existing technology.

[0009] The reaction schedule described i...

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Abstract

The invention discloses a high purity low molecule biphenol an epoxy resin synthetic process which comprises, throwing bisphenol A, epichlorohydrin, carbonate or anion exchange resin into autoclave, agitating, elevating the temperature to 60-110 deg. C for 3-10 hours till the end of reaction, filtering, scouring filter cake 1-2 times with epichlorohydrin, and proceeding vacuum distillation to the filter liquor. The molar range of proportionality of the raw material bisphenol A, epichlorohydrin and carbonate or anion exchange resin is 1:4-20:2-10.

Description

technical field [0001] The invention relates to an epoxy resin, in particular to a process for synthesizing high-purity low-molecular-weight epoxy resin. Background technique [0002] Bisphenol A type epoxy resin is also called E type epoxy resin, its chemical structural formula is: [0003] [0004] When n=0 in the structural formula, it is called: Ep340, which is an idealized product. The existing preparation process is to first put bisphenol A into the dissolution kettle, then pass through epichlorohydrin, heat up to above 70°C to dissolve, then pump the solution into the reaction kettle with agitator, and add a phase transfer catalyst (PTC, such as quaternary ammonium salt), add lye dropwise, control the reaction temperature at 50-55°C, maintain it for a certain period of time until the end of the reaction, reduce the pressure to 94.66kPa at 100°C, and recover excess epichlorohydrin for recycling , add solvent (toluene, methyl ethyl ketone, etc.) until the water dr...

Claims

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Application Information

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IPC IPC(8): C08G59/04
Inventor 于静何宏伟
Owner QINGDAO DIC FINECHEM
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