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Silicone tube after the emergence of a lot of gas hole, how to do?
On the silica gel on the discovery of a problem: silicone tube after the emergence of a lot of cross section pores. The raw material is natural rubber carbon black, what is the cause? There are 3 reasons for guessing:
1 Is it right? Because silica with water?
2 is not the accelerator M moisture to cause the hole?
3 is not the formula of silicone hose is too heavy, the impact of cross-linking will also appear on the air?
First of all, the "root cause" to find a cure, so better cure. White carbon black water, accelerator M, Cadogan point oxidation beggar; in fact, silicone tube with silica do extrusion, the risk is big, is mainly manifested in the following aspects:
1 plastic material production when the temperature is not reached, the dispersion is not good, the rubber material containing high moisture content.
2 extruder temperature is not set, the pressure is not enough, you can mix some of the back, will be better.
3. You and promoting the lack of time, dosing powder is to the powder to eat well, but also to do time parked, interval of 12 hours, there have been the problem has been solved.
In fact, silica after precipitation of water is very much, with no use of calcium oxide. The best way is not to add precipitated silica, using other filler.
In short, the silicone tube of the extrusion of plastic material, but also with the extrusion temperature and pressure. I hope to help novice.
This paper is from Shenzhen,, id=562?
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