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Method of detecting multilayer vacuum bag film leakage point by means of oxygen-sensitive substance

An oxygen-sensitive, vacuum bag technology, applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, etc. The length of the process and the difficulty of process control are moderate, saving manpower and material resources, and ensuring the effect of forming pressure

Active Publication Date: 2017-08-04
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art that the air leakage point of the vacuum bag film cannot be accurately found, and to provide a method for detecting the air leakage point of the multilayer vacuum bag film by using an oxygen-sensitive substance. Once the vacuum bag film leaks, the oxygen in the air entering the vacuum bag film layer will react with the sensitive substance, and the sensitive substance will undergo a color change that can be observed by the naked eye, realizing the vacuum bag Membrane air leak self-test

Method used

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  • Method of detecting multilayer vacuum bag film leakage point by means of oxygen-sensitive substance
  • Method of detecting multilayer vacuum bag film leakage point by means of oxygen-sensitive substance

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Embodiment 1

[0026] A method for detecting the air leakage point of a three-layer vacuum bag film by using an oxygen-sensitive substance. Under the protection of inert gas nitrogen, the catechol compound is first melted and blended with the pellets of the vacuum bag film to obtain pellets. Then, the pellets of the vacuum bag film and the pellets obtained by melt blending are three-layer co-extrusion compounding, so that the catechol compounds that will change color after encountering air are evenly dispersed in the three-layer vacuum bag film. The second layer, then the three-layer vacuum bag film is placed in the air, and the vacuum bag film is observed. The point where the observed color changes is the air leakage point. The color change is within the range visible to the naked eye, from colorless to pink. It finally turned black, and the second layer of the vacuum bag film was an interlayer with a thickness of 10 μm, and the content of the catechol compound in the interlayer was 0.1 wt%....

Embodiment 2

[0030] A method for detecting the gas leakage point of five-layer vacuum bag film by using oxygen-sensitive substance. The pellets, and then the pellets of the vacuum bag film and the pellets obtained by melt blending are co-extruded and compounded in five layers, so that the catechol compounds that will change color after encountering air are evenly dispersed in the five-layer vacuum bag film. Then place the five-layer vacuum bag film in the air and observe the vacuum bag film. The point where the observed color changes is the air leakage point, and the color change is within the visible range from colorless to pink. , and finally turned black, wherein the third layer of the vacuum bag film is an interlayer with a thickness of 30 μm, and the content of catechol compounds in the interlayer is 10wt%. The adhesion of catechols is polydopamine, and the structural formula of polydopamine is as follows:

[0031]

[0032] In the formula, n represents the degree of polymerization...

Embodiment 3

[0034] A method for detecting the leak point of a four-layer vacuum bag film by using an oxygen-sensitive substance. Under the protection of inert gas helium, the catechol compound is first melted and blended with the pellets of the vacuum bag film to obtain The pellets, and then the pellets of the vacuum bag film and the pellets obtained by melt blending are co-extruded and compounded in four layers, so that the catechol compounds that will change color after encountering air are evenly dispersed in the four-layer vacuum bag film. Then put the four layers of vacuum bag film in the air, observe the vacuum bag film, the point where the observed color changes is the air leakage point, the color change is within the visible range of the naked eye, from no The color changes to pink, and finally to black. The second and third layers of the vacuum bag film are interlayers with a thickness of 20 μm, and the content of catechol compounds in the interlayer is 5wt%. The compound has goo...

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Abstract

The invention relates to a method of detecting the multilayer vacuum bag film leakage point by means of an oxygen-sensitive substance. The oxygen-sensitive substance is added to the intermediate layer of a multilayer vacuum bag film and the oxygen-sensitive substance is maintained in an non-oxidative state, and then the multilayer vacuum bag film is placed in the air, the point with color change under the observation is the leakage point, the oxygen-sensitive substance changes color as meeting the air, the color change is visible to naked eye, the layers of the multilayer vacuum bag film are equal to and greater than 3, and the intermediate layer is any one or more interlayers between the inner surface layer and the outer surface layer of the vacuum bag film. The method can automatically detect its own air tightness based on the external oxygen concentration change of the vacuum bag film, accurately and quickly find out the place of leakage, and timely take remedial measures, and guarantees the moulding pressure of a composite material member, thereby saving the production cost, improving the production efficiency, and having the advantage of industrialized popularization.

Description

technical field [0001] The invention belongs to the field of air tightness detection of vacuum bag films, and relates to a method for detecting gas leakage points of multilayer vacuum bag films by using oxygen-sensitive substances. Background technique [0002] With the increasing demand of composite components in aerospace, ships, trains and other fields, the performance requirements of auxiliary materials used in the molding process are also higher. Vacuum bag film is a vacuum auxiliary material used to prepare composite components by autoclave molding or vacuum-assisted molding. It provides a vacuum-tight environment for composite materials together with sealing tape. pressure. However, in the production process of vacuum bag film, trachoma is easy to appear, and trachoma cannot be observed with the naked eye. Therefore, in the manufacturing process of composite material components, vacuum bag film is prone to air leakage, bag burst and other phenomena, resulting in cure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/20
CPCG01M3/20
Inventor 胡秀凤胡仲杰胡潇潘利剑刘卫平
Owner DONGHUA UNIV
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