Method for detecting and removing air tightness defect of epoxy resin mould

An epoxy resin and air-tight technology, which is applied in the direction of measuring devices, suspension and porous material analysis, scientific instruments, etc., can solve the problems that the release of micro-pores cannot be thoroughly discovered, and the defects of micro-pores cannot be fundamentally eliminated. To achieve the effect of improving surface quality and service life, ensuring air tightness and good permeability

Inactive Publication Date: 2010-07-14
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods cannot fundamentally eliminate these micro-pore defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0012] Example 1

[0013] The fluoropolyurethane matt enamel paint can be diluted according to the following components and proportions: 100 parts of TS96-71 fluoropolyurethane emulsion, 10 parts of paint curing agent, 30 parts of diluent, and mixed evenly. When in use, you can use a paint spray gun to put the diluted fluoropolyurethane matte enamel into the paint spray gun, and spray the fluoropolyurethane matte enamel evenly on the surface of the epoxy resin mold, and evenly spray a coating with a thickness of about 0.1mm. After standing for 12 hours, observe the surface of the epoxy resin mold in a place with good light. Use an air drill to drill a pit with a diameter of Φ6mm and a depth of about 5mm at the micro-pore defect, and then fill it with epoxy resin. After the epoxy resin is cured, the sand For the smooth surface, spray the fluoropolyurethane matt enamel diluted according to the above ratio and check whether the micro-pore defects have been eliminated. If there are ...

Example Embodiment

[0014] Example 2

[0015] Use 90 parts of TS96-71 fluoropolyurethane emulsion, 10 parts of curing agent, 30 parts of thinner, and stir evenly to form a fluoropolyurethane matte enamel; then put the diluted fluoropolyurethane matte enamel into the paint spray gun and spray evenly on the epoxy resin On the surface of the mold; the thickness is about 0.2mm. After placing it for 10-12 hours, observe the surface of the epoxy resin mold in a place with good light. Use an air drill to drill a pit with a diameter of Φ5mm and a depth of about 4mm at the micro-pore defect. The epoxy resin is filled and the surface is sanded after the epoxy resin is cured, and then sprayed with a fluoropolyurethane matte enamel diluted according to the above ratio, and check whether the micro-pore defects have been completely eliminated. If there are still micro-porous defects, repeat the above method until all the defects are eliminated, and finally spray twice to improve reliability.

[0016] The curing ag...

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PUM

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Abstract

The invention discloses a method for detecting and removing the air tightness defect of an epoxy resin mould. The method comprises the following steps of: uniformly stirring 80 to 100 parts of fluorinated polyurethane emulsion, 8 to 10 parts of curing agent and 20 to 30 parts of diluent into a fluorinated polyurethane aphotic enamel paint; putting the diluted fluorinated polyurethane aphotic enamel paint in a paint spray gun, and uniformly spraying the paint on the surface of the epoxy resin mould; standing for 12 hours, observing the micropore defect on the surface of the epoxy resin mould under good light; and drilling a pit with the diameter no more than phi 6mm in a micropore defect part, filling up the pit by epoxy resin, sanding the surface, and spraying the diluted fluorinated polyurethane aphotic enamel paint. The method is simple, convenient and rapid, and has low cost; and the micropore defect on the surface of the epoxy resin mould can be rapidly found and removed, the surface hardness of the mould can be improved, and the service life of the mould can be prolonged.

Description

technical field [0001] The invention relates to a method for detecting and eliminating microporous defects affecting airtightness of epoxy resin molds. Background technique [0002] At present, the body and front skin of the maglev train made of composite materials are all vacuum-molded on a large mold with a minimum size of 2 meters and a maximum size of 12 meters. The typical structure of the mold is steel skeleton base + glass fiber reinforced plastic body + epoxy resin surface. In order to ensure the forming quality of composite parts, the vacuum airtightness of the mold is generally required to be very high. However, the adhesive between the epoxy resin surfaces of the FRP body has air that cannot be completely eliminated and the gas generated by the curing of the epoxy resin, resulting in a micro-reticular air path in the mold and microporous defects on the surface. Due to the existence of micropores, it is difficult to ensure the airtightness of the mold. If microp...

Claims

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Application Information

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IPC IPC(8): B29C33/70G01N15/08
Inventor 张勇兵谢安彬肖慧儒
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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