After continuous research and development and improvement, YQXPOLYMER successfully launched 9821A/B high-toughness epoxy resin for winding molding. This product is a two-component epoxy resin system with the characteristics of moderate viscosity, long pot life and good operability. Its cast body has excellent mechanical properties, high elongation at break and good impact resistance.

9821A/B epoxy resin has excellent wettability to both carbon fiber and glass fiber, and is suitable for the production of high-toughness composite products wound with various types of fibers, such as carbon fiber high-pressure gas cylinders.

Carbon fiber composite high-pressure gas cylinders are made of carbon fiber materials and epoxy resin bodies through winding and high-temperature curing processes. Compared with metal gas cylinders, the carbon fiber material itself has better performance.

What are the advantages of high-pressure gas cylinders made of carbon fiber compared with metal gas cylinders?

Carbon fiber itself is lighter than aluminum, only about 1/4 of steel. Therefore, carbon fiber high-pressure gas cylinders weigh about 50% less than metal gas cylinders of the same volume, making them lighter to use.
The carbon fiber material itself has high strength and the compressive strength can reach more than 3000mpa, which can fully ensure the pressure stability of the carbon fiber high-pressure gas cylinder, making it safer and more reliable.
Carbon fiber high-pressure gas cylinders have excellent corrosion resistance and are resistant to acid, alkali, salt and atmospheric corrosion, making them safer to use.

During the processing of carbon fiber high-pressure gas cylinders, the carbon fiber winding process is mostly used. Under the action of tension, the carbon fiber bundles are impregnated with epoxy resin and continuously wrapped around the rotating mandrel, gradually forming a cylindrical structure. Most of the winding processes used are wet winding, in which the carbon fiber bundles are first processed in a specific dipping device, then directly wound onto the mandrel under tension control, and finally formed through curing and other processes.

The most commonly used wet winding method in the carbon fiber winding molding process has lower cost and good craftsmanship. Wet winding equipment mainly includes fiber frame, tension control equipment, dipping tank, spinning nozzle and rotating mandrel structure. The most advanced six-dimensional winding technology in the world can well control the fiber direction and realize the combination of hoop winding, spiral winding and plane winding. In actual production, a combination of helical winding and circumferential winding is often used. Circular winding can eliminate the hoop stress caused by the internal pressure of the gas cylinder, and helical winding can provide longitudinal stress and improve the overall performance of the gas cylinder.

The resin matrix of carbon fiber high-pressure gas cylinders not only needs to meet the mechanical strength and toughness requirements of the cylinder, but also because the matrix is prone to fatigue damage in a long-term inflation and deflation environment, a high-strength, fatigue-resistant resin system is needed to protect the cylinder service life. In addition to meeting the corresponding properties, the resin matrix used in wet winding molding is also required to have a lower initial viscosity at the operating temperature and a longer pot life at this temperature. Epoxy resin has the advantages of high bonding strength, small curing shrinkage, no small molecule volatiles, good process formability, heat resistance, good chemical stability, and low cost. It also has a large space for modification, is widely available in sources, is reasonably priced, and is suitable for wet winding process systems.

The resin in the composite material layer of high-pressure gas cylinders mainly uses epoxy resin. Epoxy resin is one of the commonly used thermosetting resin matrices in resin-based composite materials. It has the advantages of high bonding strength, small curing shrinkage, no small molecule volatiles, good process formability, heat resistance, good chemical stability, and low cost, and is widely used in fiber winding processes.

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