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
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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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