Process for coating titanium dioxide on solid materials
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF COATING BASED ON TITANIUM DIOXIDE, WHICH PROCESS COMPRISES FEEDING TWO SOLUTIONS CONCURRENTLY TO AN AQUEOUS SUSPENSION OF MATERIAL TO TO COATED HAVING A TEMPERATURE OF ABOUT 50-100*C. AND A PH BETWEEN 0.5 AND 3.5, SAID TWO SOLUTIONS BEING (A) AN AQUEOUS 0.001 TO 0.2 MOLAR SOLUTION OF A TITANIUM SALT HAVING A CONTENT IN FREE ACID CORRESPONDING TO A NORMALITY OF 0.002 TO 1.5; AND (B) AN AQUEOUS 0.025 TO 8 NORMAL ALKALI METAL BASE WITH THE PROVISION THAT THE FEEDING OF THE ALKALI METAL BASE IS MAINTAINED SO THAT IT IS JUST CAPABLE OF NEUTRALIZING THE ACID CONTAINED IN THE TITANIUM SALT SOLUTION AS WELL AS THE ACID PRODUCED DURING THE REACTION, AND THAT THE QUANTITY OF TITANIUM SALT ADDED PER MINUTE IS KEPT WITHIN THE ORDER OF MAGNITUDE OF ABOUT 0.01 TO 20X10**-5 MOLES PER SQUARE METER OF SURFACE TO BE COATED.
Inventors
- 👤 Hanswolfgang Kohlschutter
- 👤 Helmut Getrost
- 👤 Walter Reich
- 👤 Hubert Rossler
- 👤 Walter Horl
Bibliographic Details
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