Explanation

resin made by condensation of furfuryl alcohol with acid catalyst. The unassimilated resin is a red viscous liquid that is not easy to flow, and can be soluble in acetone, alcohol, ether, etc., but insoluble in benzene. Inorganic acid or organic acid is used as curing agent. Strong acids (such as sulfuric acid or p-toluenesulfonic acid) can make resin curing at room temperature. Weak acids (such as phthalic anhydride, maleic anhydride, phosphoric acid) basically do not increase the viscosity of resin at room temperature, and can be curing after several hours at 95-200 ° C, which is suitable for low-pressure molding. After curing, it is acid resistant (not resistant to oxidizing acids such as nitric acid, chromic acid, etc.), alkali resistant, organic solvent resistant, water resistant, heat resistant (glass fiber can be used at 120 ° C after reinforcement), high hardness, good adhesion with carbon, graphite, asbestos, glass fiber, etc. The tensile strength of pure resin after curing is lO.9MPa. The bonding strength to wood is 6.7MPa, and to steel is 1.1MPa. The disadvantages are high brittleness, poor adhesion to the surface of non porous materials, and large curing shrinkage. It can be used to manufacture corrosion resistant FRP pipes, valves, pump bodies and molded products, as well as anti-corrosion linings, acid resistant mastic, corrosion resistant coatings and various adhesive. resin is cheap, especially as foundry sand core binder, which can improve casting quality and labor productivity. It is especially suitable for mass machinery manufacturing, such as automobile, military industry, internal combustion engine, diesel engine, sewing machine, etc.

Classification