With the growing emphasis on the development of social security, and Environmental protection , New Phenolic resin New varieties and phenolic resin molding technology has been developed. According to experts, industry associations epoxy, phenolic resin, synthetic resin, the first industrialization have been 100 years of history, because it easy to get raw materials, synthetic resin after convenience and performance to meet many application requirements, so die Plastic , Insulation materials, Paint , Wood adhesive and so widely used. In recent years, as people increased security requirements, with the flame retardant, low smoke, low toxicity and other characteristics of phenolic resin attracted renewed attention, particularly in airports, train stations, schools, hospitals and other public buildings, facilities and aircraft interior decorative materials, the application is increasing. And unsaturated Polyester Resin compared to the low reactivity of phenolic resin, curing the condensation of water release, so curing must be carried out under high temperature and pressure conditions, a long time before the general can only enhance the materials impregnated prepreg (cloth). This method can only be used
molding process or the winding process, severely limited its application in the field of composite materials. In order to overcome the shortcomings inherent in phenolic resin, to further improve the performance of phenolic resin to meet the needs of high-tech development, people phenolic resins a lot of research to improve the toughness of phenolic Resin, improve mechanical properties and heat resistance, improved process performance become a focus of the study. In recent years, China has successively developed a series of new phenolic resin, such as the modified phenolic resin, vinyl acetylene-modified phenolic resin, cyanate ester ring-opening polymerization of phenolic resin and phenolic resin. Can be used for SMC / BMC, RTM, pultrusion, spray and hand lay composite molding technology. Modification of phenolic resin present mainly in the field to 12. First, Polyethylene Alcohol acetal modified phenolic resin, industrial application was most of the phenolic resin modified with polyvinyl acetal, which can increase the resin bond strength of glass fibers to improve the brittleness of phenolic resin to increase the mechanical strength of composite materials reduce the curing rate and thus help reduce the molding pressure, use of hydroxymethyl acetal and phenolic resin reaction is an excellent special ink carrier resin.
Second, polyamide modified phenolic resin, phenolic resin modified by polyamide resin improved the impact toughness and adhesion, as modified polyamide is a polyamide type hydroxymethylation use hydroxymethyl or active hydrogen in the process of synthetic resin or the resin curing reaction during the formation of chemical bonds to achieve the purpose of modification, with the fishing rod made of resin such as thin-walled tube has excellent mechanical properties. Epoxy resin is very common. China Epoxy Resin Industry Association, said experts with thermosetting phenolic resin and bisphenol A epoxy resin mixture can be made of composite material advantages of both the two kinds of resin, to improve their own shortcomings so as to achieve the purpose of modification. This mixture has excellent adhesion of epoxy resin to improve the brittleness of phenolic resin, phenolic resin also has excellent heat resistance, poor heat resistance of epoxy resin to improve the shortcomings. This modified by methylol phenolic resin and epoxy resin in the hydroxyl and epoxy group in chemical reactions, and the hydroxyl group of phenolic resin and epoxy resin in a chemical reaction, the final pay linked to form a complex body structure to achieve the objective, is the most widely used method of phenolic toughening.
The first four areas that silicone modified phenolic resin, silicone resin has excellent heat resistance and resistant to moisture resistance, using different organic silicon monomer or mixed monomer and phenolic resin with different properties available The modified phenolic resin, with a wide range of selectivity, as a transient high temperature materials for rocket, missile and other ablative materials; boron can also be modified phenolic resin, phenolic resin, due to the introduction of the molecular structure of inorganic boron elements, making modified phenolic resin heat resistance, instantaneous heat resistance, erosion resistance and mechanical properties better than conventional phenolic resins are used for rockets, missiles and space vehicles and other space technology as a good resistance to burning erosion material; rubber modified phenolic resin by blending mode to add the phenolic resin, acrylonitrile-butadiene rubber is an effective way of toughening, rubber, resin quality and the quantity is usually 2 to 10%, impact toughness can increase by 100% or more, The resin can be widely used in aerospace and other fields.