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Method for producing porous silicone sheet, frozen body, and porous silicone sheet rolled-body

Inactive Publication Date: 2018-03-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a method for producing a porous silicone sheet by freezing a wet gel and forming it into a sheet. The resulting sheet is thin and can effectively remove impurities through cleaning. The method prevents fracture and damage during the freezing process and maintains the shape of the wet gel. These technical effects contribute to the production of a high-quality porous silicone sheet.

Problems solved by technology

However, in those porous bodies, elastic modulus of a gel is extremely low, and brittleness is high as a whole.
Therefore, it was difficult to impart flexibility withstanding large deformation to the porous bodies.

Method used

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  • Method for producing porous silicone sheet, frozen body, and porous silicone sheet rolled-body
  • Method for producing porous silicone sheet, frozen body, and porous silicone sheet rolled-body
  • Method for producing porous silicone sheet, frozen body, and porous silicone sheet rolled-body

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069]n-Hexadecyltrimethylammonium chloride (10 g) as a surfactant and urea (50 g) were added to 5 mM acetic acid aqueous solution (150 mL), followed by mixing those in a glass vessel under stirring.

[0070]Methyl trimethoxysilane (30 mL) and dimethyl dimethoxysilane (20 mL) as precursors were added to the glass vessel, followed by stirring with a stirrer for 60 minutes. After stirring, the resulting solution was transferred to a cylindrical closed vessel, and heated at 80° C. for 24 hours, thereby hydrolyzing urea to form basic conditions. The precursors hydrolyzed were polycondensed by a sol-gel reaction under the basic conditions.

[0071]The wet gel (swallen gel) obtained was allowed to stand in a freezer of −10° C. for 5 hours in the state of placing the wet gel in the vessel, and formed into a frozen state. The cylindrical wet gel in a frozen state was taken out of the vessel, a mandrel was driven into the cylindrical wet gel along a center axis thereof, and the cylindrical wet gel...

example 2

[0072]A porous silicone body formed into a sheet in a roll form (rolled-body of a porous silicone sheet) was obtained under the same conditions as in Example 1, except that cleaning by FV cleaning method (a method in which a chrysanthemum type rotor rotates in punching metal roll to generate water flow in an opening part of the punching metal roll, and an object to be cleaned is brought into contact with the water flow to perform cleaning, number of revolution of chrysanthemum type rotor: 450 rpm, cleaning liquid: water, water temperature: 25° C., path length: 10 m) was conducted as the cleaning step. Similar to Example 1, as a result of measuring an apparent specific density of the porous silicone body prepared, it was a normal numerical value of 0.09 g / cc, and it was confirmed that impurities could be appropriately removed.

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Abstract

The present invention provides a method for producing a porous silicone sheet comprising a freezing step of freezing a wet gel of a porous silicone body having communicating pores and a three-dimensional network silicone skeleton which forms the pores and which is formed by a copolymerization of a bifunctional alkoxysilane and a trifunctional alkoxysilane, to obtain a frozen body, a sheet forming step of forming the frozen body into a sheet to obtain a porous silicone sheet, and a cleaning step of cleaning the porous silicone sheet. According to the method of the present invention, a porous silicone body from which impurities have been sufficiently removed can be produced. In the course of the production, occurrence of fracture of a wet gel can be effectively prevented.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for producing a porous silicone sheet, frozen body, and a porous silicone sheet rolled-body.BACKGROUND ART[0002]A sol-gel reaction involving phase separation has conventionally been known as a method for obtaining a monolithic porous material having continuous though-holes with controlled sizes in an organic-inorganic hybrid system using an oxide such as silica or titania, and a trifunctional alkoxysilane as starting materials (see Patent Documents 1 and 2). However, in those porous bodies, elastic modulus of a gel is extremely low, and brittleness is high as a whole. Therefore, it was difficult to impart flexibility withstanding large deformation to the porous bodies.[0003]In view of the conventional problems, studies on a monolithic porous material further having high flexibility are proceeding. Patent Document 3 describes the preparation of a silicone monolithic body of an aerogel or xerogel having continuously penetr...

Claims

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Application Information

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IPC IPC(8): B32B27/28B29D7/01C08G77/06C08G77/14C08J5/18
CPCB32B27/283B29D7/01C08G77/06C08G77/14C08J5/18C08J9/286C08J9/36C08J2201/0504C08J2201/0546C08J2205/028C08J2205/05C08J2383/04C08J9/24
Inventor MATSUO, NAOYUKI
Owner NITTO DENKO CORP
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