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    Home > Coatings News > Paints and Coatings Market > Characteristics of EB cured epoxy resin

    Characteristics of EB cured epoxy resin

    • Last Update: 2020-03-04
    • Source: Internet
    • Author: User
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    As a new curing method of thermosetting resin, EB curing technology has the advantages of high efficiency, low cost and environmental protection The earliest goal of EB curing is high-performance thermosetting resin for aerospace Later, materials scientists turned their eyes to epoxy resin Research shows that EB curing epoxy resin can obtain high-performance structural materials and has been applied in solid engine shell materials The main advantage of EB cured epoxy resin is that it can cure rapidly at room temperature This advantage makes it more and more important and known as the new technology of thermosetting resin production in the 21st century Compared with heat curing, the energy required for electron beam curing is only 1 / 10-1 / 20, but the curing speed is 10 times of that of heat curing At the same time, EB curing at room temperature greatly reduces the stress concentration and residual stress caused by thermal shrinkage, and improves the mechanical properties of the cured resin Janke et al Showed that the glass transition temperature of EB cured epoxy resin can be as high as 390 ℃, and its TG has exceeded that of some polyimides, which can be used to prepare high heat resistant materials Farmer et al Found that EB cured epoxy resin can be formed by lamination, filament winding, resin transfer molding (RTM) and vacuum resin transfer molding (VARTM), and its processing technology is diverse Iverson and others found that the volatile content of EB cured epoxy resin is generally lower than 0.1%, which is much less than the emission during thermal curing, so that the impact of solvent volatilization on the environment and operators is minimized At present, there are still some differences on the use of EB curing epoxy resin in some aspects Zhang Zuoguang et al Found that if some bisphenol A epoxy resins (such as shell EPON 828) were cured only by EB, the curing degree of the resulting resin was low and needed heat treatment The curing degree and high temperature modulus of EB cured epoxy resin can be greatly improved by heat treatment near its glass transition temperature However, janke et al Believe that high-performance composites can be obtained without heat treatment, and the research on this aspect is still in progress EB curing refers to the curing of monomers or oligomers by intermolecular cross-linking reaction under the action of high energy electron beam The reaction mechanism is similar to that of cationic polymerization Because the reaction system produces cation, anion, free radical and other intermediates under the action of EB, the curing mechanism of different systems is different For epoxy resin system, the curing mechanism is mainly cationic polymerization, and the initiator is usually diaryl iodide or triaryl matte Lappin et al Put forward the mechanism of cation curing by free radical reaction to generate anion and then initiate curing reaction: firstly, benzophenone is excited by electron beam, then it reacts with isopropanol to generate free radical, and finally the free radical reacts with iodized salt to produce protonic acid and initiate ring opening polymerization of cation Sui Gang et al Used GS, IR, ESR and other methods to study the reaction process and mechanism of electron beam curing of epoxy resin According to the experimental results, it was deduced that the curing reaction of some epoxy resins (such as 828 epoxy resin) was carried out according to the cation reaction mechanism Firstly, the iodide salt was decomposed under the action of electron beam and hydrogen atom was taken from monomer or hydrogen impurity to produce protonic acid Cationic ring opening polymerization If the reaction system contains more than two functional groups of epoxy resin, it will react according to this mechanism to form a space network structure to realize material curing.
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