A kind of preparation method of preform, fiber fabric intermediate

Abstract

The invention provides a preparation method of a preform and a fiber fabric intermediate. The method uses RTM bulk resin as a setting agent, and under the premise of not affecting the filling flow of the RTM resin, the dosage of the traditional setting agent is reduced from 3 ~5% to 10~20%, and use the hot-melt prepreg process to infiltrate the dry fabric with RTM resin, so that the obtained dry fabric intermediate has the cutting and laying manufacturability of prepreg, The deformation amount of the fiber during the preparation of the preform is reduced, the preparation quality of the fiber preform is improved, the preparation requirements of the complex structure preform are met, and the forming quality of the RTM product is finally ensured.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a preparation method of a preform and a fiber fabric intermediate, in particular to a preparation method of a preform and a fiber fabric intermediate in a composite material liquid forming process. Background technique [0002] The low-cost liquid molding process of composite materials (such as RTM, VARI, etc.) has been widely used in various technical fields of composite materials, and has gradually developed from the production of secondary load-bearing structural parts to the main load-bearing structural parts. One of the key technologies in the composite material liquid molding process is the preparation technology of the product fiber preform. Fiber preforms require a large amount of dry carbon fiber fabrics or glass fiber fabrics. Since the fiber fabrics are not impregnated like prepregs, they are prone to deformation, resulting in fiber buckling, ply angle deflec...

AI Technical Summary

Problems solved by technology

[0003] The traditional sizing agent often uses a solvent-based sizing agent, which uses the solvent to volatilize the fiber to harden the shape. The pre-setting treatment method is to brush the solvent-based fiber sizing agent on the fiber, and the fiber will harden after the solvent is evaporated. The amount of fiber deformation will be smaller than that of unshaped, but the viscosity of the fixed fabric is very small at room temperature. It is possible to lay a simple flat plate, but it is difficult to prepare fiber preforms for complex structural composite products, which limits the RTM. The application of technology on complex composite structural parts; and the general RTM resin is easy to penetrate into the fiber because of its low viscosity. Styling agent material report

In addition, the content of the sizing agent in the fabric after the traditional sizing method is generally (3-5)%, and the prepreg equipment cannot be used for automatic production. It can only be painted by hand, which requires a lot of manpower, resulting in very high production efficiency. Low, and in the case of a small amount, it will also lead to poor setting effect. In addition, if the content of setting agent is increased, it will not only affect the flow of RTM resin, but also appear to be incompatible with RTM resin, which will affect to a certain extent. Mechanical Properties of Composite Materials

Images