Tilt Mixers and Dump Temperatures...

[Pete51]

We work with a company in China that is using a internal/tilt mixer. We will be mixing a mineral (silica) filled NR compound and will be adding silane to it. We believe we will need to mix a masterbatch first and bring the mixing temperature up to and dump at 150C.

Our supplier feels his machine is capable of only to 130C max. First, is this true of tilt mixers? Can they only reach a max of 130C? Second, is 130C high enough to get the silane to react with the silica?

Thanks,

Pete

 

[GrahamBennett]

To answer your questions: Yes to the first; no to the second. I have never liked this type of mixer for this simple reason. They cannot got the mix hot enough for the silica/silane reaction to take place in a reasonable time frame - it has to be around 135-145°C for it to be economical. Another pointer, the temperature needs to be held there for about 3 - 5 mins to complete the reaction and to ensure all of the ethanol produced as a by-product is gassed off from the mix before it's dumped.

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