High-whiteness, non-heat-treated hydrophobic precipitated silica
A technology of precipitated silica and hydrophobicity, which is applied in the direction of thin material treatment, dyed organic silicon compound treatment, silicon oxide, etc., can solve the problems of high price and high cost of silica, and achieve low thickening performance, good mechanical and optical properties, and good additive effect
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[0293]The base silica is dried via a spin-flash dryer and coated with a silicone oil (eg DOW CORNING(R) 200 FLUID 50 CS, carbon content about 33%, viscosity 50 mPas). The silica was then aged (at least 48 hours at room temperature) until the methanol wettability was at least 20%. The analytical data for the aged silica are presented in Table 1.1.
[0294] Analytical data for aged silica
water
%
5.2
pH value
6.1
μS
41
N 2 surface area
m 2 / g
84
CTAB surface area
m 2 / g
132
Tamping density
g / L
317
Alpine SR>180 microns
%
63
%
95.9
C content
%
4.12
Methanol wettability
%
>20
[0295] The base silica was coated with silicone oil (dimethylpolysiloxane, 50 mPas, eg DOW CORNING(R) 200 FLUID 50 CS, carbon content about 33%) in a 1:1 mass ratio in a Gericke mixer. The powder thus obtained w...
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