A kind of nano-gas-conducting film for improving the appearance of fiber composite materials and its preparation method

Abstract

The invention relates to a nano air leading membrane for improving the appearance of a fibrous composite material and a preparation method thereof. A mixed material obtained by uniformly mixing epoxy resin, phenolic resin, a latent curing agent, an accelerant, an amine curing agent, a nano filling material and a solvent according to parts by weight is coated on a release base material, so as to form a structure in which the mixed material is used as an intermediate layer and the release base material as upper and lower surface layers; the nano air leading membrane is obtained through rolling or cutting the structure to be a sheet material in a proper size. By using the preparation method of the nano air leading membrane for improving the appearance of the fibrous composite material, which is provided by the invention, the nano air leading membrane is successfully made, and is applied to the molding process of a composite material; an inherent air bubble of a material and an air bubble generated in the molding process can be effectively led out or thinned; the appearance of a product is enabled to be smooth and full; the rubber shortage does not exist; a pinhole does not exist; the yield of the product is improved.

Description

technical field [0001] The invention relates to the field of composite material molding, in particular to a nano gas-conducting film for improving the appearance of fiber composite materials and a preparation method thereof. Background technique [0002] At present, all products made of fiber composite materials, such as rackets, bicycles, drones, bats, etc., are affected by changes in molds, materials, release agents, air pressure and weather during the production process. There will be unevenness, lack of material, and pinholes, especially when some products require the texture of special materials on the surface. Once the product has the above-mentioned poor appearance, the product will become a substandard product. Even if it does not cause scrapping, the appearance needs to be repaired. Currently Each production factory adopts the follow-up cumbersome soil filling process to make up for it, so as to meet the requirements of repairing the appearance. The usual method is ...

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Problems solved by technology

[0002] At present, all products made of fiber composite materials, such as rackets, bicycles, drones, bats, etc., are affected by changes in molds, materials, release agents, air pressure and weather during the production process. There will be unevenness, lack of material, and pinholes, especially when some products require the texture of special materials on the surface. Once the product has the above-mentioned poor appearance, the product will become a substandard product. Even if it does not cause scrapping, the appearance needs to be repaired. Currently Each production factory adopts the follow-up cumbersome soil filling process to make up for it, so as to meet the requirements of repairing the appearance. The usual method is to use multiple fillings, multiple sprays, and multiple grindings of epoxy resin primers to fill in the thick and thin repairing sections. This method greatly increases the material cost of the production plant and the labor intensity of the employees. At the same time, this repeated multi-fill, multi-spray, and multi-grinding method will also cause overgrinding of the product, affect the strength, and elongate the process. Low efficiency will also cause some technical indicators of the product to fail to meet standards, such as: W / B (weight and balance), MOI (dynamic balance), SI (hardness), RA (rigidity), VIBRATION FREQUENCY (vibration frequency), etc., final sluggish product

In addition, the traditional soil filling workshop has large grinding dust and harsh working environment, which poses safety hazards to operators and indirectly increases labor costs. This problem has become a bottleneck restricting the development of the industry, and it is urgent to revolutionize the processing technology.

[0003] Patent application CN 104647636 A discloses a preparation method of a gradient prepreg with intralayer air guide passages. By adjusting the composite process parameters in the prepreg preparation process, the impregnation degree of the resin to the dry fiber is controlled, so that the resin There is a symmetrical distribution gradient of the middle layer in the thickness direction of the prepreg. While infiltrating the fibers, a gas discharge channel is reserved in the prepreg layer, thereby completing the preparation of a gradient prepreg with an intralayer gas conduction channel. However, the size of the gas guide channel is non-nano-scale, which is easy to cause gas accumulation, large pores, and eventually lead to lack of glue in the product, which is not suitable for fiber composite materials

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