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Analysis on the reason of the air bubble in the silica gel tube
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Curing is an important process in the production of silicone tube. The quality of the silicone tube is closely related to this. We all know that if the silicone tube produced less sulfur will more or less some bubbles, it is good to affect the quality of the product. The following is an analysis of the causes of the bubbles in the silicone tube.
First of all, there are bubbles in the silicone tube, which mainly has the following:
1, long time curing at low temperature, glue heating for a long time, a slow start sulfide, gas enough time to discharge the mold. At this time fewer defects within the rubber, vulcanized physical performance was higher.
2, low temperature and short curing time, sizing partially cross-linked, gas can not be completely discharged bubbles produced. At this time the bubble WIP surface.
3, the high temperature for a short time, especially on thick products, the surface has complete vulcanization, internal has just begun, discharge pressure within the gas expansion, at this time of the bubble more WIP center.
4, high temperature, long time, the gas is suppressed, the table is not defective, but the micro gas has been present in the rubber, easy to produce more defects, physical properties are not high.
5, the gas is mixed in the process of processing in the rubber, and there is the adsorption of water, filling the inner hole with the air, will expand after heating
6, if the gas after the overflow if the rubber does not start to cross, the gas will be along the plastic expansion of the mold
7, if the rubber crosslinking is completed, the flow of gas is limited, not the formation of bubbles can be seen, but the gas is still
8, if the external curing of rubber products, Chibe Naomi reached a positive cure, after the release of pressure in the mold, the internal flow of gas to form a micro hole
In short, personal feeling in addition to the factors caused by sulfur and other factors, there are other factors. For example, the air of the workshop will have some impact, and hope that you can help.
This paper is from Shenzhen,, id=462?
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