The preparation of graphene fiberglass typically involves the process of combining graphene with fiberglass or a matrix made of fiberglass. This process can be accomplished in a variety of ways, common ones include:

(1) Coating method: This is a direct method that involves coating graphene in liquid form on the surface of fiberglass. This can be achieved by dipping or spraying. A suspension of graphene can be evenly coated on fiberglass and then dried or cured to fix the graphene.

(2) Chemical vapor deposition (CVD): This method grows graphene directly on the surface of fiberglass by decomposing carbon-containing gases at high temperatures. This method can produce high-quality graphene thin layers.

(3) Dip method: In this method, the fiberglass is immersed in a solution containing graphene so that the graphene is evenly distributed on the fiber. The graphene is then fixed to the fibers using heat or chemical methods.

(4) Composite material mixing: This method involves mixing graphene powder with fiberglass and other resin or matrix materials, and then making composite materials through molding, injection molding or other molding techniques.

The choice of these methods depends on the required graphene coverage, the end use of the composite, and cost-benefit considerations. The addition of graphene can greatly improve the performance of fiberglass, but it also requires a precise preparation process to ensure the uniform distribution and effective combination of graphene. With the development of technology, these preparation methods are constantly improving and optimizing.