What is the epoxy resin-modified cyanate process?

Cyanate (CE) resin usually refers to a binary phenol derivative containing 2 or more cyanate hydromeric groups, which, under the action of heat or catalyst, occurs a cyclic trijuminal reaction to form a large molecule containing a highly cross-linked network structure of the triglyceride ring. CE resin curing after low shrinkage, low moisture absorption, good electrical performance, with excellent bondability, good flame retardant, low smoke and ablation properties, glass transformation temperature is higher. CE resin also has excellent mechanical properties, its bending strength is higher than the double-phenolic group epoxy resin (EP), bending module between the double Malayamide (BMI) resin and multi-official group EP. CE resin at room temperature is mostly solid or semi-solid state, soluble in common solvents, and with reinforced fibers have good immersion, showing excellent bonding, coating and fluidizing characteristics, not only can be molded with traditional injection molding, molding and other processes, but also suitable for advanced aerospace composite molding processes, such as: winding, thermodythic tank, vacuum bag and resin transfer molding (RTM) and so on. Although CE resin has many excellent properties, but because of its high temperature of thermoset reaction, long curing time, high manufacturing costs, its monomer polymerization cross-link density is too large, coupled with the polymeric structure of the triglyceride ring is highly symmetrical, high crystallization, resulting in CE resin curing after more brittle, in addition to its poor hydrolysis, easy to crystallize from the composite material pre-immersion material. Therefore, in order to reduce the application cost of CE resin and further improve its performance, more and more attention has been paid to the research on the modified CE resin. Among them, thermoosteroid resins mainly have EP and BMI resins.
China Coatings Online

Experts
recently introduced the epoxy resin modified cyanate process.
First of all, the expert introduced the mechanism of co-polygene reaction: CE/EP co-polymer has a very complex reaction, in addition to generating their own ermeretic products, but also through isocyanate, oxycodone and other co-polystruct structure units to form co-polymer. It is generally believed that there are 3 stages of co-occurrence: CE is gathered into a triamcinolone interlinking structure, CE official energy group and epoxy hydrogenic group react to produce structures such as umazine ketone, and polyetherization reaction occurs in epoxy. It also first forms a triglyceride ring, including uncatalytic system: CE impurities are mainly phenols and metal ions remaining in water and resin synthesis, under heating conditions, impurities containing lively hydrogen react with monobodies, resulting in intermediates and products that act as catalysts for CE curing; Cobalt cyclaneate, copper acetylate (II.), copper acetyl acetone (II.), acetyl acetone chromium, methamphetamine, acetyl acetone system transition metal compounds, titaniumate, zinc acetate, N, N-dimethylamine and N, N-dimethylphenidate, etc., in early studies also used transitional metal salts, pyridophenol system as a catalyst for EP modified CE resin, but the effect is not very good. Regarding the co-polyjuxual reaction between EP and CE, the mechanism of EP/CE resin co-polymer reaction is widely recognized as: CE tri-polycyclic ring, shrinking glyceride ether inserted into cyanate ring, alkyl cyanate isomerized into alkyl isocyanate, alkyl isocyanate and shrinking glycerides produce abhorrentone, alkyl elimination to produce phenols, shrink glyceline ether and phenol.
with regard to the above shrinking glycelyceride ether and phenol additive, ep and CE co-fusion reaction also has a mutual catalytic effect, a small amount of EP can promote CE curing reaction, and a small amount of CE can also promote EP curing reaction. A small amount of hydroxyl energy present in epoxy resin can catalycify the tripolyceride reaction of cyanate; In the process of curing reaction, it is thought that first CE self-amerses to form a tricycline cross-linking network, and then EP occurs ermeretic or EP reacts with residual CE. It is also thought that the CE/EP reaction system is umazole ketone is produced by ep and triamcinolone ring reaction, and then umazole is heterogeneous. The CE/EP system was catalyticly cured using traditional CE curing catalysts (e.g. transition metal salt and pyrethrol systems) and it was found that these catalysts only acted on CE's trijudant ring reaction and were not active on EPs. M.D. Martin et al. have studied the mixture of CE resin and four-function energy EP, and the main reaction of the curing process is the tri-polypulation of CE and the generation of alkyl isocyanate, which is formed only when the isochemical ratio and contain excessive EP. The use of EP modified CE resin is a good way to reduce the application cost of CE tree moon and further improve its performance. The co-fusion reaction between CE and EP is very complex, and most of the current research and future work is still focused on the in-depth study of its curing reaction structure. EP modified CE resin will also be one of the hot spots in the research of advanced resin-based composite materials in recent time.
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