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Liquid composition for forming porous silica film and porous silica film formed from the liquid composition

A technology of liquid composition and silicon dioxide, applied in the direction of silicon dioxide, silicon oxide, silicon compounds, etc., can solve problems such as bad, uncontrollable substrate adhesion, easy to cause cracks, etc., to achieve crack resistance and adhesion Not easy to resist, good adhesion effect

Active Publication Date: 2018-01-12
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with films formed by vapor phase methods such as vacuum evaporation methods, films formed by the sol-gel method cannot be controlled to a desired pore size, have poor adhesion to the substrate, and easily cause cracks. The problem
[0008] In addition, the porous silica membrane disclosed in Patent Document 2 is intended to separate and filter nanoparticles from liquid substances such as water and organic solvents, and may not be suitable for separating particles with an average particle diameter in the range of 10 to 200 nm.

Method used

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  • Liquid composition for forming porous silica film and porous silica film formed from the liquid composition
  • Liquid composition for forming porous silica film and porous silica film formed from the liquid composition
  • Liquid composition for forming porous silica film and porous silica film formed from the liquid composition

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preparation example Construction

[0022] [Preparation of hydrolyzate (binder) of silicon alkoxide]

[0023] The hydrolyzate of the silicon alkoxide constituting the liquid composition of the present invention, that is, the binder is obtained by adding 0.5 to 5.0 parts by mass of water, 0.005 to 0.5 parts by mass of an organic acid or an inorganic acid relative to 1 part by mass of the above silicon alkoxide It is obtained by mixing parts by mass, alcohol, glycol ether, or organic solvent of glycol ether acetate in a ratio of 1.0 to 5.0 parts by mass to carry out the hydrolysis reaction of the above-mentioned silicon alkoxide. SiO of the hydrolyzate 2 Concentration (SiO 2 amount) is 1 to 20% by mass, particularly preferably 5 to 15% by mass. If hydrolyzed SiO 2 When the concentration is less than the lower limit, the adhesion of the film is lowered and cracks are likely to occur. If the concentration exceeds the upper limit, the reaction liquid may gel and cannot be mixed with the silica sol. Here, the rati...

Embodiment

[0036] Next, examples and comparative examples of the present invention will be described in detail.

[0037] [Preparation of hydrolyzates of 11 kinds of silicon alkoxides]

[0038] As shown in Table 1, tetramethoxysilane (TMOS) and tetraethoxysilane (TEOS) were prepared as silicon alkoxides, formic acid and nitric acid were prepared as inorganic acids or organic acids, and Propylene glycol monomethyl ether acetate (PGMEA). These were mixed in parts by mass shown in Table 1 to prepare hydrolyzates of 11 types (No. 1 to No. 11) of silicon alkoxides.

[0039] For example, the hydrolyzate of No. 1 silicon alkoxide was prepared as follows. First, tetramethoxysilane (TMOS) was prepared as a silicon alkoxide, and 1.5 parts by mass of propylene glycol monomethyl ether acetate (PGMEA) was added as an organic solvent to 1 part by mass of the silicon alkoxide. , the first solution was prepared by stirring at a temperature of 30° C. for 15 minutes. In addition, as the silicon alkoxid...

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Abstract

The purpose and subject of the present invention are to provide a liquid composition for forming a porous silica membrane that can be easily controlled to a desired pore diameter and a porous silica membrane formed from the liquid composition. A silica porous membrane with good adhesion and less likely to cause cracks. The liquid composition for forming a silica porous film of the present invention is prepared by mixing a hydrolyzate of tetramethoxysilane or tetraethoxysilane as a silicon alkoxide and a silica sol in a liquid It is formed by dispersing fumed silica particles having primary particles with an average particle diameter of 40 nm or less and secondary particles with an average particle diameter larger than the primary particle of 20 to 400 nm in the medium, and the amount of SiO2 in the hydrolyzate (A) The mass ratio (A / B) relative to the amount of SiO2 (B) of the silica sol is in the range of 1 / 99 to 60 / 40. The liquid composition of the present invention can be used to form porous silica membranes suitable for catalyst supports, gas filters, filter bodies and the like.

Description

technical field [0001] The present invention relates to a liquid composition for forming a porous silica membrane having a porous structure that can be easily controlled to a desired pore diameter, and a porous silica membrane formed from the liquid composition. More specifically, it relates to a liquid composition for forming a porous silica membrane suitable for a catalyst carrier, a gas filter, a filter body, and the like, and a porous silica membrane formed from the liquid composition. [0002] This application claims priority based on Patent Application No. 2014-047439 filed in Japan on March 11, 2014 and Patent Application No. 2014-258617 filed in Japan on December 22, 2014, and uses the contents thereof here. Background technique [0003] Conventionally, as a method for producing an open-pore type porous body utilized in a catalyst carrier, a gas filter, a filter body, etc., it has been disclosed that the surface of an open-pore type porous laminate whose pore diamete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12B01D71/02C01B33/14
CPCB01D53/228B01D67/0048B01D71/027C01B33/126C09D183/04B01D2325/02B01J21/08B01J35/0013B01J37/0215B01J37/0236C09D1/00
Inventor 增山弘太郎日向野怜子山崎和彦
Owner MITSUBISHI MATERIALS CORP
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