Nano inner core sandwich type structural silica dioxide delustring agent and preparation method thereof

A silica and matting agent technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of low porosity, poor transparency, high porosity, etc., achieve good matting performance, not easy to settle, unbreakable effect

Active Publication Date: 2009-12-23
GUANGZHOU HUMAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] For the silica produced by the liquid phase method, the product properties obtained by different process routes are different: the silica prepared by the gel method has a firm structure, narrow pore size distribution, good transparency, but low porosity ; The silica prepared by the precipitation method has a high porosity, but the structure is loose, and the structure is easily destroyed under high shear, and the transparency is also poor
[0008] So far, the silicon dioxide produced by the liquid phase method cannot meet the requirements of both firm structure and high porosity at the same time

Method used

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  • Nano inner core sandwich type structural silica dioxide delustring agent and preparation method thereof

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Embodiment 1

[0036] Pass 1L of 10% silicate solution through ion exchange resin for ion exchange, then adjust the pH of the reaction solution to 2.5, age at 60°C for 2h, and then add it to the reactor containing 15% silicate solution under stirring conditions Adjust the pH to 9 and keep it for 1 hour after the addition is complete to prepare the nano silica core; while stirring, the temperature is raised to 80°C, and 15% sodium silicate solution and 7% hydrochloric acid solution are added dropwise at the same time, by controlling the acid The pH of the reaction system was adjusted to 8.5 by the dropping amount, and the temperature was kept for 1 hour after the dropping. Filter, wash, surface treatment with polymer. Spray drying equipment is used to remove the moisture contained in silica, and a supersonic jet mill is used to crush the silica to 3 microns.

Embodiment 2

[0038]The silica matting agent was prepared basically according to the same method as described in Example 1, but the difference from Example 1 was that the temperature was raised to 70° C. under stirring, and then 10% sodium silicate solution and hydrochloric acid solution were added.

Embodiment 3

[0040] The silica matting agent was prepared basically in the same manner as described in Example 1, but the difference from Example 1 was that 10% sodium silicate solution and 7% nitric acid solution were added dropwise at the same time.

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Abstract

The invention discloses a silicon dioxide matting agent with a sandwich structure and a preparation method thereof. The particle size of the silica matting agent of the present invention is between 2-30 μm, and the silica matting agent includes a nano core made of silica and a flocculent coating layer composed of silica, wherein the nano The diameter of the inner core is between 10-50nm; relative to the nano inner core, the flocculent covering layer has a relatively bulky structure. The matting agent of the invention not only has the advantages of high oil absorption value and high porosity of the silica matting agent produced by the precipitation method, but also has the firm structure and transparency of the silica matting agent produced by the gel method.

Description

Technical field [0001] The present invention relates to a silica matting agent and a preparation method thereof. More specifically, the present invention relates to a new silica material with a sandwich structure of nano-core and flocculent coating, a preparation method and its preparation method. Application of matting agent. Background technique [0002] In the coating industry, amorphous silica has a refractive index similar to that of most resins used in the industry, and has good optical properties when used in varnishes. Therefore, amorphous silica has become a high-end coating matting agent. Preferred. The main characteristic parameters that affect the silica matting agent are pore volume (porosity), average particle size and particle size distribution, surface treatment and so on. The earlier used matting agent is the amorphous silica produced by the gas phase method. For example, Chinese patent application CN02822370.5 discloses a silica matting agent comprising amorphou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/06C09C1/28C09D7/12
Inventor 张晴
Owner GUANGZHOU HUMAN CHEM
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