dcsimg Fiber Sizing

Beneficial binders

Strong polyurethane solutions for the reinforcement of plastics

Glass-fiber reinforced plastics (GRPs) and carbon-fiber reinforced plastics (CFRPs) are found in cars, household appliances, sports equipment and a number of other everyday items. But before such fibers can reinforce plastics, they are usually pretreated by sizing.

fiber sizing

Baybond® polyurethane dispersions from Covestro are used for the formulation of sizes for glass and carbon fibers, which are used to reinforce thermoplastics and thermosetting composites.

Glass fiber sizing and carbon  fiber sizing based on Baybond® binders have superior film-forming properties and solid adhesion while maintaining outstanding colorfastness even at high temperatures. Some Baybond® products contain blocked isocyanates with butanone oxime or caprolactam, which improve the mechanical properties of thermoplastics (higher tensile strength and modulus of elasticity) as a result of thermal post-curing in the compound.

When used in the manufacture of glass fiber sizings, Baybond® polyurethane dispersions have good compatibility with additives like adhesion promoters, lubricant agents, antistatic agents and flexibilizers.

Unlike many competing offerings, Baybond® products feature an ionic/non-ionic hydrophilic modification, a combination that ensures solid compatibility with other sizing components, pH stability, reliable thermal stability and high shear stability.

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