Polyacrylonitrile (PAN-based) × Vinyl sizing agent

The vinyl sizing agent is an interfacial modification system specifically developed for carbon fiber–reinforced vinyl ester resin composites. By optimizing the interfacial bonding strength between the fiber and the resin matrix, it serves as a key technological support for high-performance composite materials.

Conventional epoxy-based sizing agents often lead to interfacial performance degradation due to incompatibility with the curing mechanism of vinyl ester resins (epoxy ring-opening polymerization vs. free-radical polymerization). In contrast, vinyl sizing agents effectively overcome this limitation through the synergistic effects of chemical bonding and physical interaction, significantly improving interfacial compatibility and overall composite performance.

The vinyl sizing agent enables strong interfacial bonding between the fiber and the resin through molecular-level synergistic interaction, including covalent bonding, hydrogen-bond adsorption, and topological interlocking. This significantly enhances the mechanical performance and long-term durability of the composite material.

Carbon fiber composites using vinyl sizing agents offer excellent environmental resistance, including resistance to strong acids, salt spray, and hygrothermal aging. They are therefore an ideal choice for demanding applications such as marine vessels, chemical storage tanks, and
high-end sporting equipment, while also providing the advantage of rapid processing and molding.

Vinyl carbon fiber fabric is a composite material combining carbon fiber and vinyl ester resin, offering excellent strength, corrosion resistance, and lightweight characteristics. To further enhance its performance, the fabric is typically treated with a vinyl sizing agent.

The vinyl sizing agent improves the surface wettability and adhesion of carbon fibers, thereby strengthening the bonding between the fibers and the resin matrix and enhancing the overall mechanical performance. At the same time, it improves the strength, wear resistance, and aging resistance of the fabric.

In the shipbuilding and water sports equipment sectors, high-performance vinyl carbon fiber composites are driving innovations in lightweighting and corrosion-resistant technologies.

Thanks to the excellent compatibility between vinyl ester resin and carbon fiber, this material not only achieves extreme lightweight performance—about one-fifth the weight of steel, but also significantly improves interlaminar shear strength through thioether crosslinking technology. As a result, it maintains long-term resistance to salt spray corrosion even in harsh marine environments, effectively reducing maintenance costs.

Whether used in full ship structures or in the lightweight hulls of competitive racing boats, vinyl carbon fiber can significantly reduce weight while maintaining structural strength, thereby improving navigation efficiency and handling performance.

In addition, the use of an environmentally friendly water-based formulation and vacuum-assisted molding processes further optimizes material performance, making it an ideal choice for marine vessels and water sports equipment.

Vinyl Carbon Fiber
Unmanned Surface Vessel

This carbon fiber unmanned survey vessel features high structural strength and low weight, making it easy to transport and suitable for a wide range of applications.

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