Glass fiber is an important reinforcing material for the manufacture of fiber reinforced plastics (FRP), and is also used for weaving high temperature resistant fiber cloth.But the glass fiber that has not been treated is brittle, easy to take static electricity after friction, and the surface is smooth, when making the reinforcing material of the resin is not easy to stick with the resin.In the manufacture of fiberglass, a sizing agent (or a bundling agent) must be used in order to make a continuous filament of fiberglass into a yarn, increasing its surface polarity, toughness, and strength.Sizing agent is generally composed of water-based resin film-forming agent, lubricant, coupling agent and other additives (such as antistatic agent), such as emulsion or aqueous solution.Sizing agent plays an important role in the properties of glass fiber and the FRP materials made from it.

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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