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Explain the related problems of the silicone tube curing temperature and time
Not long ago, a colleague asked them what they needed to produce a silicone tube, which was asked about the curing temperature and time of silicone tube. Need not need
Two stage? What is the cure temperature and time of the two? In addition, the shrinkage rate of silicone tube is how much?
First, the curing temperature and time of the silicone tube is determined according to the formula, the temperature and the time is to look at the size of the product.
The shape, thickness, silicone tube then you can try the temperature to 175, then the first time control in 60 to 80 seconds
Bar, need not need to look at the two part of the sulfide to look at your product itself, to see if the product has no taste, spray and other phenomena!
Secondly, silicone tube curing temperature and time, we must first find out what is the coordination of silicone, and then check the
The half life of this kind of crosslinking agent can then be calculated by determining the curing temperature and time. Silica gel, peroxide as crosslinking agent, must be
Must be done in the two section, to make the silicone tube to achieve the best performance!
Then vulcanization temperature time is determined by the rheometer, usually silicon rubber vulcanizing temperature general around 170 degrees Celsius in the temperature
The degree of under the rubber vulcanization time determine rheometer. Silicone tubes are usually required for the two time, curing temperature and time you can
Ask the supplier of raw materials or check their information on the Internet. The shrinkage rate of silica gel is not specific, personal feeling with silica gel
Varieties, mold structure has a relationship bar.
Finally, need not need to two section of the vulcanized I have said, look at the product in the curing of the mold cooling down, see if there is a spray cream
Elephant, or products have a great smell, etc., so that the need for the two time, as for the temperature and time of the curing temperature and time control, do not need
Rheometer to measure, when measured rheometer is a standard, such as thickness, shape and size, this depends on the specific!
In short, I tried to do a few experiments to know. Temperature at 170 - 200; time 10 - 100 seconds;
Compare to see what kind of effect is good. If you want to be very accurate time and temperature, need to see the use of plastic material
Curve. The general situation of a sulfur temperature at about 180 degrees Celsius, curing time in about 2 minutes. Wall thin silicone tube in general
Do not have to two sulfur, only to do a relatively thick and big things to need two sulfur. There are two aspects of the role of sulfur in two aspects: 1, so that the product molding
Better (this is determined by the curing curve, the general one to complete the finished product can only reach 90% to 95% of the degree of vulcanization. Two sulfur
In order to fully cured); 2, the remaining solvent evaporating completely inside the wip. Little experience.
Personal point of view, the first to do 170, 175, 180 of the contrast, or there is a trade-off problem: if the request is not too high
As far as possible, the temperature can be raised a little, because of the high efficiency; if the requirements are particularly high, then it is clear that the low temperature long time
The change rate will be reduced. There is no rule. If the product is used in industry, it can be considered without the two time,
If used for food, it must be two sulfur, the general two sulfur temperature is recommended in the 170-200 degrees, the time 2-4 hours, when let also look at
Whether the product has a yellow change
This paper is from Shenzhen,, id=549?
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