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Heat treatment after silicon dioxide surface moisture absorption quantity is low, and the filling products moisture absorption quantity also declined significantly, the reason may be due to the high temperature heating under the condition of hydrogen bond association of adjacent hydroxyl dehydrated to form a stable key units, resulting in reduced under the water absorbing capacity, this method is simple and economic. Only through heat treatment, however, cannot very good improve when filling interface adhesive effect, so in practice, often with fine silica particles using zinc compounds, and the heat treatment under the condition of 200 ~ 400 ℃, or the use of silane and transition metal ions with fine silica particles processing, and then after heat treatment, or use the poly dimethyl siloxane modified two silicon dioxide, then heat treatment.

Chemical modification:

Use of alcohols, amines, fatty acids, or polymer surface of modified silicon dioxide.  

Because the modifier modification effect is different, which USES the same kind of modifier, the modified effects may also be due to different vulcanization system or due to silica, the surface would decline, polarity composition reduce after cooperate with ethylene propylene rubber, decline of the interfacial tension of fillers and polymer compatibility increased, but contrary to expectations, after filling rubber vulcanization, physical performance and dynamic performance did not improve, this is due to the packing surface structure of alcohol group electronegativity hindered the filler in rubber forming network structure. White carbon black particle surface silanol groups with methanol and cetyl alcohol esterification to improve its surface properties. Zero after a gas-solid chromatography surface coverage tests show that the initial performance of white carbon black surface varies according to its preparation methods, graft copolymerization stage significantly reduces the dispersion and the specific components of the solid surface free energy, changed the surface of the enthalpy, entropy change. This change size is dependent on the preparation methods of silicon dioxide (gas phase method change significantly, but also rely on the 28-volume branch chain length (cetyl alcohol produce big change).



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