Abstract: The present disclosure relates to a glass fiber sizing agent for a daylighting panel. The sizing agent includes effective components and water. The sizing agent has a solid content of 2-8%. Percentage of solid mass of each of the effective components in a solid mass of the sizing agent is as follows: a silane coupling agent: 3-15%; a film-forming agent: 68-93%; a lubricant: 0.5-10%; an antistatic agent: 1-12%; and a pH regulator: 0-5%. The present disclosure further relates to a preparation method of the glass fiber sizing agent for a daylighting panel and use of the sizing agent in fields of glass fibers and composite materials. Compared with the prior art, glass fiber products produced from the sizing agent of the present disclosure have a suitable stiffness and wet-out speed, and the sizing agent has an excellent refractive index, which is similar to that of matrix resin.

Abstract: A sizing composition for glass fiber direct roving for producing multiaxial fabrics is provided. The sizing composition includes, based on the total solids mass of the composition, 0.1 to 5.0% by solid mass of a first silane coupling agent, 2.5 to 11.0% by solid mass of a second silane coupling agent, 3.0 to 20.0% by solid mass of a first film former, 45.0 to 75.0% by solid mass of a second film former, 0 to 5.0% by solid mass of a plasticizer, 0.2 to 4.0% by solid mass of a first lubricant, 5.0 to 20.0% by solid mass of a second lubricant, and 0.01 to 3.0% by solid mass of a pH regulator. The first film former is a multifunctional epoxy emulsion, and the second film former is a low-molecular-weight liquid epoxy emulsion.