Preparation method of self-supporting semi-impregnated self-adhesive non-buckling pre-shaped fabric

Abstract

The invention belongs to the technical field of low-cost preparing of high-performance composite materials, and relates to a preparing method for self-supporting half-infiltration self-adhesion non-buckling pre-sized fabric. A preparing thought for the self-supporting half-infiltration self-adhesion non-buckling pre-sized fabric is provided, high-alignment arrangement of fiber bundles is achievedthrough a yarn arranging mechanism and a tension control device arranged in a pre-impregnation compound machine, and buckling braided fabric used in the traditional RTM technology is replaced. When the pre-sized fabric is subjected to pre-impregnation, high-porosity ultra-thin non-woven fabric is guided to the surface of fiber bundle yarn, the operation manufacturability of the pre-sized fabric isimproved, and meanwhile the tenacity of the composite material can be effectively improved through the high-porosity ultra-thin non-woven fabric. Through optimization of preparing technology parameters, a high-viscosity resin glue film is distributed on the surface of the pre-sized fabric, and compared with the dry-state fiber pre-sized fabric used in the traditional RTM technology, the pavementmanufacturability of the pre-sized fabric is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of low-cost preparation of high-performance composite materials, and relates to a preparation method of a self-supporting semi-impregnated self-adhesive non-buckling predetermined fabric. Background technique [0002] Advanced resin-based composite materials have the advantages of excellent specific strength, specific stiffness, fatigue resistance, stiffness design and easy realization of structure-function integrated design, etc., and their application in the aerospace field shows incomparable advantages of other materials. [0003] At present, the most important composite material forming process at home and abroad is the autoclave forming process, which is suitable for the manufacture of large-sized, relatively low-complexity skin and wall panels. Prepreg composites can guarantee a high fiber volume fraction and thus have excellent in-plane mechanical properties. Utilizing the good surface viscosity and ...

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Problems solved by technology

However, the RTM process also has some limitations. For example, 1) the in-plane mechanical properties of the composite materials prepared by the RTM process are generally lower than those of the autoclave process (the fiber volume fraction is generally about 60%), because the low viscosity in the RTM process The resin infiltrates the dry preform under the action of hydraulic pressure, and the fiber volume fraction of the RTM process composite material is generally controlled at about 55%, further increasing the fiber volume fraction will not be conducive to the flow infiltration of the liquid resin; 2) The traditional RTM process uses The dry fiber braid is used as a reinforcement material. During the weaving process of the fiber braid, the fiber bundles are worn, and the fiber bundles after weaving have a certain degree of buckling, which will affect the mechanical properties of the composite material, especially the fiber bundles. Dominant mechanical properties (such as longitudinal tension and longitudinal compression); 3) Composite materials, especially aerospace composite materials, generally require high impact damage resistance (composite materials have high toughness). Impregnated composite materials can be toughened by adding a high-viscosity thermoplastic toughening agent to the matrix resin to achieve high toughness of the composite material

However, the RTM molding process requires the resin to have a lower viscosity in order to improve the flow wettability of the resin to the dry fiber preform, so it is impossible to achieve high toughness of RTM composites through in-situ toughening.

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