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Silica technology of silicone tube
As the main reinforcing filler, silica plays a very important role in the production of silicone tube. The main varieties of white carbon black has precipitated white carbon black, gas phase white carbon black, fumed silica and, in the high temperature vulcanized silicone rubber, RTV silicone rubber or plus liquid silicone rubber, the all white carbon black are not the same, sometimes need to add structure control agent, sometimes need to preprocess.
Different types of silicone tube to join the white carbon black, pretreatment of processing methods and results have different requirements. White carbon
Black after treatment as a reinforcing filler to join the silicone rubber, the main play a role in enhancing the mechanical strength. But it will bring other
Unfavorable factors. A sharp increase in the viscosity of the glue is not conducive to the operation; the other impurities into the composition of the silicone rubber
Can wait. Therefore a good treatment of white carbon black should not be brought into the other impurities and the viscosity increased slightly, can add greater than
Cases of white carbon black in the rubber.
To compound, generally do not have to deal with, as long as the join structure control agent on the line; single group divided into moisture curing silicone rubber often
Taking into account the fluidity, extrusion and thixotropy; liquid silicone rubber is mainly on account of liquidity. For liquid silicone rubber, it can be
By adding silicone resin to improve its mechanical properties, and thus to obtain high strength of the transparent silicone rubber. Addition and condensation type
The biggest difference is that the different crosslinking agent, crosslinking mechanism, in the treatment of white carbon black is the same!
One is about HMDS treatment of yellow, I think this is the problem of treatment process, such as adding an excess of treatment agent or over high temperature
This method has no problem, I do not deal with T40, the product is also very transparent, but also with the time or place
There is no relationship after heating.
Two is MQ, MQ or VMQ is the key to adjust the proportion of M and Q, there is no fixed form, can be a solid, can also be a viscosity
Low liquid. Only from the reinforcing effect, certainly not as good as the white carbon black, but to improve the fluidity and adhesion is ideal
, but also can control the composition to improve the tear resistance and other properties.
Three is the amount of white carbon black: general as a reinforcing 15 - 50 is more appropriate.
This paper is from Shenzhen,, id=508?
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