Method for preparing hydrophobic silicon dioxide

A silicon dioxide and hydrophobic technology, applied in the direction of inorganic compound addition, dyeing organosilicon compound treatment, dyeing physical treatment, etc., can solve the problem of unsatisfactory high hydrophobicity, and achieve the goal of preventing self-condensation and self-condensation reaction Effect

Inactive Publication Date: 2007-11-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a satisfactory high hydrophobicity has not yet been obtained

Method used

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  • Method for preparing hydrophobic silicon dioxide

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preparation example Construction

[0071] In the preparation of the hydrophobized silica of the present invention, it is sometimes necessary to store the hydrophobic silica fine particles for a long time until they are actually used, and during this storage, hydrophobic silica particles may be generated. Agglomeration of powder. Hydrophobic silica with good dispersibility can be obtained by adding a fluorine-based surfactant when hydrophobizing reaction with hydrophilic silica. As the fluorine-based surfactant, there are fluorine-based compounds represented by the general formulas (3) to (5). In general formula (3), R 7 It is a perfluoroalkyl group with 5 to 8 carbon atoms, A is COOM, SO 3 M base, M is Na, K, Li. In general formula (4), R 8 It is a perfluoroalkyl group with 5 to 18 carbon atoms, and Y is H (hydrogen atom), -OPO(OH) 2 (phosphate residue), and p is an integer of 1-15. In general formula (5), R 9 is a perfluoroalkyl group having 5 to 18 carbon atoms, Z is a chlorine atom, a bromine atom, an...

Embodiment 1

[0106] Hydrophobic silica 1 of Example 1 was prepared as follows.

[0107] Add 70 parts by weight of higher alcohol emulsion (B-1), 70 parts by weight of water, and 10 parts by weight of alkylsilane compound (A-1) and stir for 40 minutes to prepare a higher alcohol emulsion with hydrolyzate of alkylsilane compound adsorbed on the surface. Add 100 parts by weight of hydrophilic silicon dioxide (C-1) to a reactor with a stirrer, a thermometer and a condenser, and slowly add a higher alcohol emulsion with a hydrolyzate of an alkylsilane compound adsorbed on the surface under stirring, and evenly coated on hydrophilic silica. The reactor was heated to 110° C. to 130° C. while stirring, and the temperature was maintained for 60 minutes, after which water was removed to obtain hydrophobic silica 1 .

Embodiment 2

[0109] Hydrophobic silica 2 of Example 2 was prepared as follows.

[0110] In Example 1, 100 parts by weight of the hydrophilic silica (C-1) was sprayed with a higher alcohol emulsion with alkylsilane compound hydrolyzate adsorbed on the surface under stirring, and evenly coated on the hydrophilic silica superior. The reactor was heated to 110°C to 130°C, and water was evaporated while maintaining the temperature to obtain hydrophobic silica 2.

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Abstract

The invention relates to one kind of preparation methods of the hydrophobic silicon dioxide using coating, rubber, resin, agricultural chemicals or paper and so on., the characteristic of this method includes the following steps: 1)Select raw materials: according to the principle that the weight of the silicon hydride resin acceptor is 2 -20% of the water affinity silicon dioxide to select the silicon hydride resin acceptor and the water affinity silicon dioxide; 2)Mixing the silicon hydride resin acceptor and the O / W emulsion sparse hydration medicinal preparation below 0 degree C to 40 degree C, making the O / W emulsion sparse hydration medicinal preparation whose surface absorbs hydrolyze substance of the silicon hydride resin acceptor; 3)Contacting the O / W emulsion sparse hydration medicinal preparation made by the second step, with the surface absorbing hydrolyze substance with the water affinity silicon dioxide, and carrying on heat treatment for the mixture of the water affinity silicon dioxide and the O / W emulsion sparse hydration medicinal preparation, the process's temperature is 100 degree C to 130 degree C, the process's time is 20 to 100 minutes, gain the hydrophobic silicon dioxide. The hydrophobic silicon dioxide made by this invention has the high hydrophobic characteristic.

Description

technical field [0001] The invention relates to a method for preparing hydrophobic silicon dioxide used in paint, rubber, resin, pesticide or paper. Background technique [0002] For a long time, due to its own hydrophobicity, hydrophobic silica has been used in matting agents, anti-aging agents, water-resistant agents, oil-resistant agents, chemical-resistant agents and fillers, and anti-fouling ( Shell) adhesion additives, surface smoothness improvers for rubber and resin, abrasion resistance improvers, and mechanical strength enhancers, fluidizers for fine powders such as toners for electrostatic copiers, carriers for hydrophobic ingredients in pesticides, disinfectants Foaming agent components, paper water repellent, oil repellant, anti-blocking agent, etc. have been used. [0003] So far, in the production of hydrophobic silica, various methods of mainly treating hydrophilic silica with a hydrophobizing agent to produce hydrophobic silica have been proposed. For examp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/12C09C3/04C09C1/28C09D7/12C08K3/36D21H17/69
Inventor 王重辉冀运东许婷杨小军
Owner WUHAN UNIV OF TECH
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