| abstract |
BET-Oberfläche 120 - 300 m 2 /g CTAB-Oberfläche 100 - 300 m 2 /g Verhältnis BET/CTAB 0,8 - 1,3 Searszahl (Verbrauch 0,1 n NaOH) 6 - 25 ml DBP-Zahl 150 - 300 g/100 g wk-Koeffizient < 3,4 Partikelgröße der abgebauten Partikel < 1,0 µm Partikelgröße der nicht abbaubaren Partikel 1,0 - 100 µm Precipitated silica characterized by the following physico-chemical parameters: BET surface 120-300 m 2 / g CTAB surface 100-300 m 2 / g BET / CTAB ratio 0.8 - 1.3 Sears number (consumption 0.1 n NaOH) 6 - 25 ml DBP number 150-300 g / 100 g wk coefficient <3.4 Particle size of the degraded particles <1.0 µm Particle size of the non-degradable particles 1.0-100 µm n n n It is made by using alkali silicate (preferablynSoda water glass) with mineral acids (preferably sulfuric acid)nat temperatures of 60 - 95 ° C with a pH ofn7.0 - 11.0 with continuous stirring, thenImplementation up to a solid concentration of 40 g -n110 g continues, the pH to a value between 3 andn5 adjusted, the precipitated silica filtered off,nwashed and then dried if necessarynground or granulated.n n n It is used as a filler in vulcanizable mixtures for tire manufacture. |