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Synthesis method of low-molecular weight epoxy resin

A synthesis method and low molecular weight technology, applied in organic chemistry and other directions, can solve the problems of low epoxy value of liquid epoxy resin, large amount of waste water, large viscosity, etc., and achieve fast reaction speed, prolong life cycle, and long reaction steps. Effect

Inactive Publication Date: 2013-05-08
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a method for synthesizing low-molecular-weight epoxy resin. In the method, industrial potassium carbonate and sodium hydroxide are replaced by potassium carbonate with a particle size of 100-300 nm, so as to solve the problem of the epoxy value of liquid epoxy resin produced by the existing synthesis process. Problems of low, high viscosity and large amount of wastewater in the synthesis process

Method used

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  • Synthesis method of low-molecular weight epoxy resin
  • Synthesis method of low-molecular weight epoxy resin
  • Synthesis method of low-molecular weight epoxy resin

Examples

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Effect test

Embodiment 1

[0034] Add 1 mole of bisphenol A, 4 moles of epichlorohydrin, 2.5 moles of potassium carbonate with a particle size of 100-300 nm and 70 ml of absolute ethanol prepared by the above method into the reactor, raise the temperature to 60°C, and finish the reaction after 10 minutes. Liquid first normal pressure distillation reclaims ethanol, then underpressure distillation reclaims excessive epichlorohydrin, finally obtains bisphenol A type colorless low molecular weight liquid epoxy resin (342 grams), and the product content of n=0 is greater than 90%, and ring The oxygen value is 0.581.

Embodiment 2

[0036] Add 1 mole of bisphenol A, 10 moles of epichlorohydrin, 4 moles of potassium carbonate with a particle size of 100-300 nm and 70 ml of anhydrous methanol prepared by the above method into the reactor, and react at 20 ° C for 60 minutes, and the reaction liquid is distilled at atmospheric pressure first. Reclaim methanol, reclaim a small amount of epichlorohydrin by distillation under reduced pressure again, finally obtain bisphenol A type colorless low molecular weight liquid epoxy resin (340 grams), the product content of n=0 is greater than 90%, and epoxy value is 0.580.

Embodiment 3

[0038] Add 1 mole of bisphenol F, 10 moles of epichlorohydrin, 4 moles of potassium carbonate with a particle size of 100-300 nm and 100 ml of anhydrous methanol prepared by the above method into the reactor, and react at 20 ° C for 40 minutes, and the reaction liquid is distilled at atmospheric pressure first. Reclaim methanol, reclaim a small amount of epichlorohydrin by distillation under reduced pressure again, finally obtain bisphenol F type colorless low-molecular-weight epoxy resin (320 grams), the product content of n=0 is greater than 90%, and the epoxy value is 0.630.

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Abstract

The invention provides a preparation method of low-molecular weight epoxy resin. The method comprises the following steps: adding bisphenol A, epoxy chloropropane, potassium carbonate having grain size of 100-300 nanometer and solvent into a reactor for reaction; and distilling or rectifying the reaction liquid, and recycling the solvent to obtain the low-molecular weight colorless liquid bisphenol A type epoxy resin. The same effect is obtained by replacing bisphenol A with bisphenol S, bisphenol F or bisphenol fluorene to synthesize corresponding bisphenol S, bisphenol F or bisphenol fluorene type low-molecular weight epoxyresin. The method for synthesizing the low-molecular weight epoxy resin has the advantages of low reaction temperature, short reaction time, simple operation, high epoxy value of product, no production of industrial wastewater and good industrial prospect.

Description

technical field [0001] The invention relates to a synthesis method of epoxy resin, in particular to a synthesis method of low molecular weight epoxy resin. Background technique [0002] Low molecular weight epoxy resin has the smallest molecular weight among epoxy resins. It has direct application in many aspects and is also the raw material for synthetic epoxy resin. Its quality not only affects its own performance, but also affects high molecular weight epoxy resin. quality. [0003] At present, low molecular weight epoxy resins generally adopt the synthesis process of NaOH as the base: first, bisphenol A and epichlorohydrin are added to the reactor, heated to about 70°C to dissolve; then phase transfer catalysts such as quaternary ammonium salts are added, and NaOH aqueous solution is slowly added Reaction, during this process, the addition rate is strictly controlled to prevent side reactions such as the hydrolysis of epichlorohydrin. After the reaction is complete, ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/27C07D301/28C08G59/06
Inventor 刘守信李军章张燕南谷中芳
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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