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China's epoxy resin glue purification technology made new progress

As a polymer with excellent performance, epoxy resin is widely used. But the epoxy resin in the synthesis process of inorganic chlorine and other impurities will seriously affect the electrical insulation properties, so the need for synthetic epoxy resin glue for purification. Recently, China's epoxy resin industry scientific and technological personnel in this area has made new progress in research, is expected to change the current purification more expensive equipment using the status of foreign equipment. In the case of
The development of the use of domestic equipment to purify the epoxy resin glue process is necessary. Experts believe that the centrifugal extractor relies on centrifugal force to complete the mixing and phase separation of the two phases, which greatly enhances the mixing of the two phases and promotes the mass transfer , Which is conducive to the purification of epoxy resin glue. To this end, Tsinghua University Institute of Nuclear Energy Technology Research Institute and other units of the first use of self-developed centrifugal extractor to join the benzene solvent E-44 epoxy resin glue purification process of experimental study, and achieved satisfactory results. According to experts, the use of inert solvents to reduce the viscosity and density of epoxy resin glue, is conducive to high viscosity epoxy resin glue purification, but inevitably consume a lot of inert solvents, emissions of sewage will cause serious environmental Pollution. In this paper, based on the study on the purification process of E-44 epoxy resin with benzene solvent, the centrifugal extractor was used to study the purification process of E-44 epoxy resin without benzene solvent. In the case of
The split-type centrifugal extractor is mainly composed of shaft, drum and shell. Wherein the drum comprises a weir section and a clarification section, the weir section has a heavy phase weir and a light phase weir that control the width of the two-phase overflow, and the clear section is provided with radial blades; the upper part of the shell has two phases of the collecting chamber and the outlet pipe, The lower part of the shell has two-phase feed port, the bottom is equipped with a fixed blade. The space between the inner wall of the housing and the outer wall of the drum is called an annulus, and the mixing and mass transfer process of the two-phase fluid is carried out in the annulus. When the density of different, immiscible two-phase liquid from the two inlet into the annulus, relying on high-speed rotating drum drive and the friction between the layers, in the gap to achieve a sharp and uniform mixing, extraction Mass transfer process is accelerated. The principle is: when the high-speed rotation of the mixture flow down after the fixed blade, from the bottom of the drum at the bottom of the mixed phase into the drum. The mixed liquid is separated by centrifugal force, and the heavy phase is thrown to the outer edge of the drum and gathered outside the drum wall. The countercurrent weir flows into the heavy phase collecting chamber through the vertical channel near the drum wall and flows out from the heavy phase outlet. The light phase is squeezed into the inside of the drum, flows through the light phase weir and the horizontal channel into the light collection chamber, and flows out from the light phase outlet. In the case of
Centrifugal extractor can be used to purify high viscosity glue, if it has a large separation factor. Speed, total flow and flow ratio and other operating conditions have an impact on the purification effect. Improve the speed, in a certain range can strengthen the two-phase liquid in the gap in the mixing, which can improve the purification effect; but the speed is too high, the two-phase liquid is easy to emulsify, increase the separation difficult, will cause the phase is not conducive to purification , And therefore need to find the best speed. For different sizes of centrifugal extractor, the best speed is not the same, to be determined by experiment. The greater the flow rate than the QaPQo, the smaller the total flow, the better the purification effect. In the case of
Purification of epoxy resin glue on the basis of diameter 50mm centrifugal extractor test, select the best test conditions. The researchers used 6-batch liquid with a diameter of 230mm centrifugal extractor for industrial scale test, the use of potential electrode method to analyze the E-44 epoxy resin - benzene liquid inorganic chlorine content. The results showed that the content of inorganic chlorine in E-44 epoxy resin-benzene liquid was less than 5mgPL after washing, which reached the quality standard of electrician grade. And the benzene-free E-44 epoxy resin glue purification, the use of diameter 230mm centrifugal extractor for industrial scale test, after washing the water E-44 epoxy resin in the inorganic chlorine content of less than 100mgPL, to the best Quality standards. And the use of the production technology to reduce the toxic organic solvents on the environment caused by pollution, and because no need to add organic solvents to wash, improve the economic benefits. In the case of
Experts believe that the use of centrifugal extractor for epoxy resin cleaning is feasible. When the benzene solvent is added for purification, the content of inorganic chlorine in the epoxy resin after purification is less than 5mgPL under the appropriate operating conditions, and the quality standard of the electrical grade is reached. When the benzene solvent is used for purification, after washing at 80 ℃ Epoxy resin in the inorganic chlorine content of less than 100mgPL, to the Department of excellent quality standards, but also greatly reduce the environmental pollution. The entire production process is simple, continuous operation, and compact equipment, occupies a small area of ??the plant, easy to achieve automatic control.