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Silicone tube in curing time is too short, the reasons for the phenomenon of burning
There is a customer inquiry, their silicone tube in order to quickly ship to shorten the time of curing, shorten the curing time must be improved
Curing temperature. But there is a problem, then the stability of the upgrade to 140 degrees Celsius, it will appear coke burning
Like. The reasons may be the following:
First, check the pH value of white carbon black, have a look of white carbon black is acidic or alkaline, pH adjustment according to the formula, the best
Or pH 6.8-7.2 silica. No pH value is close to neutral, there is no such a small range of,
General what 4-6, etc.. On the market of white carbon black pH value in general there are between 3.8-10.5, is the use of 6.8-7.2
. Is not necessarily the cause of silica acid, may be compound door, too high.
Secondly, improve the curing system, and prolong the burning time. Mainly silica surface treatment, high tear resistance silicon made
Rubber in 120 degrees from the sulfur is also very fast, while some of the high resistance to tear off the same temperature of the silicone rubber has a long time to play a good time.
White carbon black scorch as easy to say, one is acidic, partly because silica dispersion is not good. Can add some
Active agent can, in addition to some of the silica dispersing agent, curing environment must be under alkaline conditions can, silica
The plastic material of the coke burning time is very long, it is estimated that your surface active agent added too much.
In conclusion, some silica surfactant scorch time in vulcanized silicone rubber hose production significantly improved, good safety can try
Test.
This paper is from Shenzhen,, id=564?
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