Other

Valentin Anatolievich Tertykh

Nikolai Vasilievich Khaber

Alexei Alexeevich Chuiko

Anatoly Borisovich Kondratenko

Mikhail Ivanovich Khoma

Alexei Dmitrievich Chugai

Jury Davydovich Shaposhnikov

Malvina Leontievna Galashina

Valery Mikhailovich Maschenko

Vyacheslav Valentinovich Pavlov

Alexandr Nikolaevich Kutin

Elena Alexandrovna Chuiko

Vilyam Alexandrovich Sobolev

Vasily Ivanovich Vatamanjuk

A method of producing aminated silica compounds, characterized in that starting silica is heated at a temperature of 200.degree.-500.degree. C for several hours in the absence of oxygen and moisture, then cooled down to a temperature of 100.degree.-250.degree. C and treated at this temperature with an amino alcohol. The resulting product is characterized in containing grafted amino groups, their concentration being much higher than that of free hydroxyl groups on the surface of the starting silicas. This feature enables to improve the properties of aminated silica compounds and, particularly, to increase adsorption capacity and activity thereof when said compounds are used as polymer fillers.

Method of producing aminated silica compounds

A method of producing fine-disperse alkylated silica compounds, characterized in that starting fine-disperse silica is subjected to treatment with water vapors at a temperature of 110.degree.-120.degree. C to attain the humidification degree of from 2 to 40 micromoles H.sub.2 O/m.sup.2 SiO.sub.2, the thus humidified silica being then treated with vapors of alkylchlorosilane at a temperature of 250.degree. to 310.degree. C. The method of the invention allows controlling the concentration of grafted alkyl groups in the resultant product within the range of from 4.7 to 8.0 micromoles of grafted alkyl groups per m.sup.2 of the surface of SiO.sub.2. Starting silica can be modified with oxides of metals, such as aluminium, titanium, iron or zirconium oxides, the resultant products exhibiting good hydrophobic properties when used as thickeners for lubrication materials.

Method of producing fine disperse alkylated silica compounds

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Kyiv, Ukraine

Valentin Anatolievich Tertykh