Process for producing silica-based particle, coating composition for coating film formation, and base material with coating film
By growing and removing inorganic oxides in the presence of electrolyte salts, silica-based particles with internal cavities are prepared, which solves the problems of poor low refractive index and complicated preparation in the existing technology, and achieves high stability and The formation of strong coating film improves the performance and production efficiency of the coating film.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
preparation example Construction
[0043] 〔Method for producing silica-based microparticles〕
[0044]The method for producing silica-based microparticles of the present invention includes the following steps (a) and (b), which are essential steps. Moreover, the following process (c), (d) or (e) is included besides the said process. That is, the preparation method of the silica-based microparticles involved in the present invention includes (a)+(b), (a)+(b)+(c), (a)+(b)+(d), (a)+ (b)+(c)+(d), (a)+(b)+(d)+(e), and (a)+(b)+(c)+(d)+(e) A combination of processes. Next, each step will be described.
[0045] Step (a) is to add silicate aqueous solution and / or acidic silicic acid solution and alkali-soluble inorganic compound aqueous solution at the same time in alkaline aqueous solution, or in alkaline aqueous solution in which seed particles are dispersed as required, to prepare the molar ratio MO X / SiO 2 Composite oxide particle dispersion in the range of 0.3 to 1.0, wherein SiO 2 Indicates silica, MO X In...
Embodiment 1
[0126] Preparation of silica-based microparticles (P-1)
[0127] Heating 100g of SiO with an average particle size of 5nm at 80°C 2 A mixture of silica sol at a concentration of 20% by weight and 1900 g of pure water. The pH of this reaction mother liquor is 10.5, adds 9000g with SiO 2 The concentration is 1.17% by weight of sodium silicate aqueous solution and 9000g of Al 2 o 3 A sodium aluminate aqueous solution having a concentration of 0.83% by weight. At this time, the temperature of the reaction solution was kept at 80°C. Immediately after the addition of the above-mentioned substances, the pH of the reaction liquid rose to 12.5, and remained almost unchanged thereafter. After the addition, the reaction solution was cooled to room temperature, washed with an ultrafiltration membrane, and prepared with a solid content concentration of 20% by weight of SiO 2 ·Al 2 o 3 Primary particle dispersion.
[0128] Add 1,700 g of pure water to 500 g of the primary particl...
Embodiment 2
[0150] Preparation of silica-based microparticles (P-2)
[0151] 1,500 g of an aqueous dispersion of silica-based microparticles (P-1-1) having a solid content concentration of 20% by weight, 500 g of pure water, 1,750 g of ethanol, and 626 g of 28% ammonia water were prepared in the same manner as in Example 1 by heating at 35°C. The mixed solution, then add 104g ethyl silicate (SiO 2 Concentration of 28% by weight) to form a silica coating film, wash with an ultrafiltration membrane while adding 5L of pure water, and obtain silica-based microparticles (P-2-1) water with a solid content concentration of 20% by weight Dispersions.
[0152] Next, after maturing the silica-based fine particle (P-2-1) dispersion at 200°C for 1 hour, it was washed with an ultrafiltration membrane while adding 5 L of pure water to obtain a silica-based fine particle (P-2-1) with a solid content concentration of 20% by weight. Silicon microparticles (P-2-2) aqueous dispersion. At this time, the...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
| particle diameter | aaaaa | aaaaa |
| particle diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More