2020-01-10
The role of the film-forming resin is to form a thick and tough continuous protective film on the surface of the fiber to prevent the fiber from being damaged by friction. At the same time, the continuous protective film formed must have good elasticity to suit the high-speed drawing process.Among the sizing agents, film-forming substances that have been used include polyvinyl acetate emulsions, water-based polyurethanes, and water-based epoxy resins.Because water-based polyurethane has excellent abrasion resistance, elasticity and good adhesion properties, water-based polyurethane is a film-forming resin for glass fibers that has always been effective.Because the surface of glass fiber has anionic properties, cationic waterborne polyurethane resin is generally used to obtain good adhesion, and in the sizing process, a dense waterborne polyurethane film can be formed on each fiber, which is suitable for high speed of glass fiber The drawing causes shear forces on the sizing slurry.Mixtures or copolymers of waterborne polyurethane and other waterborne resins can also be used as sizing resin!
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