Modification of phenolic resin and its status
With the growing emphasis on the development of social security and environmental protection, new varieties of phenolic resin and phenolic resin molding technology has been a new development. According to experts, 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 a lot of use requirements, so molding, insulation materials, paint, wood bonding 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 in such applications is increasing. Compared with unsaturated polyester resin, phenolic resin, the reactivity is low, the curing reaction condensation water release makes curing must be carried out under high temperature and pressure conditions, a long time before the general can only enhance the materials impregnated prepreg.
In recent years, China has successively developed a series of new type of phenolic resin, such as the modified phenolic resin, vinyl acetylene-modified phenolic resin, cyanate ester ring-opening polymerization of phenolic resins and phenolic resins. Can be used for SMC / BMC, RTM, pultrusion, spray and hand lay composite molding technology. Modification of phenolic resin is present mainly in several areas. First, polyvinyl acetal modified phenolic resins, 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 composite mechanical strength, lower 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 using 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. According to experts, with a thermosetting phenolic resin and bisphenol A epoxy resin mixture made of two resin composite materials can be both advantages and 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 their goals, is the most widely used method of phenolic toughening.
Silicone modified phenolic resin is also one of the important areas of application, 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 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 the inorganic boron so that modified phenolic resin heat resistance, instantaneous heat resistance, erosion resistance and mechanical properties much better than ordinary phenolic resin are used for rockets, missiles and space vehicles in the field of space technology such as excellent resistance to erosion as material; rubber modified phenolic resin by way of the nitrile rubber blend added to phenolic resin is an effective way of toughening, rubber, resin quality and the quantity is usually 2 to 10%, impact toughness is 100%, and the resin can be widely used in aerospace and other fields.
Applications In addition, there alkynyl or allyl modified phenolic resin, phenol novolac as matrix generally, in the phenol-O-or the introduction of phenylethynyl benzene, acetylene-based, propargyl, etc..
Curing mainly through the aggregation of different functional groups to achieve, to change the traditional way of curing phenolic condensation, through the addition of phenolic resin cured thermosetting resin, compared with the traditional better thermal stability and a higher rate of residual carbon; phenolic cyanate ester resins generally refers to the linear phenolic resin as matrix, phenolic hydroxyl ester functional group was replaced by the formation of phenolic resin derivatives, in the heat and the catalyst reaction occurs ring, generated with the triazine ring high-density network structure crosslinked macromolecules, is prepared to use high-speed digital and high frequency printed circuit boards and high-power electrical insulation parts of the excellent material, but also manufacturers of high-performance structural materials through the waves and aerospace structures with high-performance composite materials the ideal substrate material.
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