Allyl esters injection molding material characteristics and processing technology
August 15, 2022
Allyl ester resin
Allyl esters are allyl based esters. Allyl esters based on monobasic or dibasic acids can be used as low tack monomers or thermoplastic prepolymers. They are often used as crosslinkers for unsaturated resins and are also used in the processing of reinforced thermosetting molding materials and high performance transparent materials.
The resin retains its original electrical properties under high temperature and high humidity conditions, and the molded article has the advantages of dimensional stability, chemical resistance, mechanical strength and heat resistance. Allyl ester resin molding compounds with flame retardant are commercially available, and some varieties have been approved by Underwriters Laboratories. Some resins, tested with their thin test pieces, have a flame-retardant UL94 V-0 flammability rating and are resistant to strong arc ignition and arc tracking.
Chemistry and properties
Commercially the most widely used allyl esters are diallyl phthalate and diallyl isophthalate monomers and prepolymers, which are easily converted into thermoset molding compounds as well as glass cloth and paper. Prepreg.
Diethylene glycol bis(allyl carbonate)
Because of its excellent transparency, it is used more and more widely. It is the main material for making plastic lenses due to its light weight, dimensional stability, abrasion resistance and easy coloring. Other applications include dashboard covers, camera filters, and all areas of the fast-growing glass industry.
Recently, a modified bisphenol A bis(allyl carbonate) has emerged, which is a transparent polymer with a high refractive index (1.56) and a diethylene glycol double (carbonic acid propylene). The refractive index of the ester is also high. In addition, there is a modified type used in lens design that changes the design of the lens. Other commercially valuable monomers are diallyl fumarate and diallyl maleate. This is a class of highly reactive trifunctional monomers containing two double bonds that can be polymerized. Allyl methacrylate also has bifunctional properties and can be used as a crosslinking agent and a monomeric intermediate. Diallyl cyanurate can be used as a crosslinking agent for unsaturated polyester resins.
