Lanxess Deutschland Gmbh

Ludwig Graeff

Andreas Schroeder

Lars Wawrzinski

Juergen Schilling

The invention relates to a method for checking the silanization of pale-colored fillers, where a mixture comprising at least one silanized pale-colored filler, preferably silanized silica, and comprising at least one rubber is irradiated with ultrasound waves in a frequency range of 4 to 10 MHz, preferably of 5 to 7 MHz, and the signal strength of the ultrasound waves is determined after transmission through the rubber mixture, where the relative attenuation coefficient αof the rubber mixture in the frequency range of the ultrasound waves is determined, the standard deviation σ of the relative attenuation coefficient αis determined, and αand σ are used for detection of incipient crosslinking of the rubber mixture.

In-line ultrasonic check for detecting the partial vulcanization of a rubber mixture in the in situ silanization of bright fillers

The invention relates to a method of testing silanization, which permits inline control of the in situ silanization of light-colored fillers, especially precipitated silicas. This enables continuous in situ silanization in the production of rubber mixtures comprising silanized light-colored fillers, and representative control of the rubber mixture under production conditions. The process is additionally nondestructive and has a high tolerance for carbon black as an additional constituent of the rubber mixture.

Method for testing the in situ silanization of bright fillers

The invention relates to novel processes for determining the quality of an uncrosslinked rubber mixture by means of ultrasound and to an apparatus suitable for this purpose.

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Viernheim, Germany

Ludwig Graeff