A kind of low temperature production liquid epoxy resin method
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A technology of liquid epoxy resin and low temperature, applied in the field of production of liquid epoxy resin, can solve the problems of increased degree of polymerization of epoxy resin resin, severe local reaction, increase of aging resin, etc., to achieve less generation of aging resin, low total chlorine, The effect of less side effects
Active Publication Date: 2022-07-01
JIANGSU KUMHO YANGNONG CHEM CO LTD
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[0010] In order to solve the problem that the existing epoxy resin processing method will cause severe local reaction and uneven reaction, increase the degree of polymerization of epoxy resin resin, and increase the aging resin in the process, the present invention provides a method that does not need artificial heating, the same environment Method for preparing epoxy resin with low oxygen equivalent viscosity, low total chlorine, and less generation of aged resin
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Embodiment 1
[0028]
[0029] Table 1
[0030] Feeding: feed according to the raw materials shown in Table 1 and the feeding amount, drop into ECH, BPA, IPA and be warmed to a temperature of 30°C,
[0031] Reaction: 49% NaOH is added with water to make 24% NaOH, and it is dropped into the reaction kettle at 30°C for 90 minutes. The whole process is exothermic. When 24% NaOH is added dropwise, the temperature of the system gradually rises. When the alkali is added, the temperature of the system rises to about 60-70°C. After standing for 30 minutes, the system is layered, and the upper layer is the crude resin, ECH, IPA. ; The lower layer is water, salt, and a small amount of IPA. The brine is separated and removed, and the ECH / IPA in the upper oil phase enters the desolvation recovery unit,
[0032] Precipitation, purification and purification: the material containing ECH / solvent crude resin is subjected to negative pressure removal after ECH / solvent precipitation is completed, the crud...
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Abstract
The invention discloses a method for producing a liquid epoxy resin at a low temperature, comprising the following steps: 1) dissolving BPA, ECH, ECH in a molar ratio of BPA:ECH=1:6-12, ECH:dissolving agent=1:0.5-0.7 2) at 25-35 ℃, dropwise NaOH with a mass fraction of 18-30% in the above mixed solution to react, and wait for the reaction Separating and removing brine after finishing, desolubilizing and reclaiming ECH and dissolving agent in the upper oil phase; 3) carrying out negative pressure treatment on the material containing ECH / solvent crude resin to remove ECH / solvent, thereby purifying and purifying the crude resin The epoxy resin is obtained; in the present invention, by introducing a dissolving agent that can be miscible with ECH and water, the reaction becomes mild, the temperature required for the reaction is low, the side reaction generated by the reaction is less, and the phenomenon of local reaction is less, and the overall performance is as follows: No heating is required in the reaction process, the same epoxy equivalent viscosity is low, total chlorine is low, and the generation of aging resin is less.
Description
technical field [0001] The invention relates to the technical field of epoxy resin processing, in particular to a method for producing liquid epoxy resin. Background technique [0002] Epoxy resin curing volume shrinkage rate is small, high hardness, strong viscosity, good dielectric properties, most of the solvent is stable, so it is widely used in national defense, national economy departments, for casting, impregnation, lamination, adhesive , coatings, etc. [0003] Epoxy resins are usually composed of bisphenol-based compounds or multifunctional phenols, such as bisphenol A, bisphenol F, bisphenol S, low molecular weight phenolic resin, o-cresol resin, bisphenol A novolac, etc. and epichlorohydrin. It is formed by condensation under the action of a catalyst. The catalyst can be quaternary ammonium salt, alkali metal hydroxide, triphenylphosphine and its derivatives, quaternary phosphonium salt, and Lewis acid. [0004] At present, the production technology status of li...
Claims
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