JPS61132308A - Manufacture of reinforced gel sheet - Google Patents

Abstract

PURPOSE:To provide a reinforced gel sheet that has a smooth beautiful surface, and is free from bubbles in the gel, by placing approximately horizontally a bottom body for a casting cell, putting thereon a gel support the circumference of which is sandwiched between a pair of gaskets thereby forming a casting cell whose upper part is open, and injecting a polymerizable monomer composition followed by polymerization. CONSTITUTION:A bottom body for a casting cell is placed horizontally, a gel support whose circumference is sandwiched between a pair of gaskets is placed thereon to constitute a casting cell whose upper part is open, and a polymerizable monomer composition is injected thereinto followed by polymerization. For example, a film of a polyester is spread on a glass sheet, and a polyester mesh that is sandwiched between a pair of packings of silicone rubber is placed thereon and is secured by clamping to form a casting cell measuring 70X310 whose upper part is open. Then a monomer composition prepared by dissolving triethylene glycol bismethacrylate, and a photopolymerization initiator in acrylic acid is poured, followed by photopolymerization to give a sheet of a gel.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for producing sheets of reinforced gel.

(Prior Art) Conventionally, fabric,
A method of applying a material constituting a gel to a support made of non-woven fabric, a mesh, a perforated film, etc.; this method is limited to materials that are within the applicable range or exhibit good density with the support: Xfff. In addition, the finish on the coated surface or surrounding areas is still not satisfactory.

(Problems to be Solved by the Invention) The purpose of the present invention is to provide a method for manufacturing a reinforced gel sheet that has a smooth and beautiful surface and does not contain air bubbles in the gel. It is an object of the present invention to provide a method for producing a sheet of reinforced gel having exposed support ends that facilitate handling of the sheet-like gel body.

(Means for Solving the Problems) According to the present invention 1, the bottom body of the casting cell is placed almost horizontally, and a pair of sketches 6 sandwich the gel around the bottom body of the casting cell. A method for producing a reinforced gel sheet, characterized in that a support is placed to form a casting cell with an open top, and a polymerizable monomer composition is injected into the casting cell and polymerized. ! ) to be violated. Materials used for the bottom body of the casting cell used in this invention include glass plates, metal plates, U (oil plates), and synthetic resin films. It is suitable because it can be used subsequently as a protective film, and particularly preferred films include vinyl chloride,
It is a film of polyethylene or polyethylene terephthalate. The film can be pretreated, such as applying a release agent, if necessary. Materials that can be used for the gasket in this invention include soft vinyl chloride, silicone rubber, etc. Among these, silicone rubber is preferred.

Cloth, nonwoven fabric, mesh (hereinafter simply referred to as mesh), and perforated film can be used as the support for the gel, but among these, it is preferable to use one that retains its own shape. The gel support is preferably placed at the bottom of a casting cell surrounded by a pair of upper and lower gaskets, which is preferred because the support does not sag downwardly and is exposed to the surface of the gel sheet even if the support is not stretched in a uniform manner. The casting cell is placed on the body and fixed by a known method such as a clamp to form a casting cell with an open top, and a pair of gaskets form the side walls of the casting cell.

The polymerizable 777-composition used in this invention is not particularly limited as long as it polymerizes to form a gel, but preferred examples include 2-hydroxyethyl methacrylate, 777-setone acrylamide, dimethyl 777-composition, and Examples include aqueous solutions of tree-philic 7/mers such as 7-ethyl methacrylate, alkoxysilylalkyl (meth)acrylate, and polyethylene glyph-rubis-methacrylate. These 7-mers may be used alone or in combination of two types. These aqueous solutions may be used as a mixture of the above, and may contain glycerin and inorganic salts as necessary. Although there are no particular restrictions on the means for polymerizing these monomer compositions, photoinitiators and radical initiators are generally used, and among these, photoinitiators are advantageous in terms of shortening the polymerization time.

(Function) The casting cell used in this invention contains a polymerizable moiety.
When injecting the merMLIfL product, the polymerizable 7mer composition still has a low viscosity, so it easily passes through the support without entraining air bubbles, and it is then dipped to create a free surface on the top of the casting cell. Form. Moreover, since the seven-mer composition does not reach the peripheral part of the support sandwiched between the gaskets, the peripheral part of the support remains exposed even after polymerization. If polymerization is started at this point, a gel sheet with a beautiful, bubble-free surface and a reinforced gel can be easily obtained. Furthermore, in the method of the present invention, the position of the support within the reinforced gel sheet can be adjusted by appropriately selecting the thickness of the upper and lower gaskets.

(Example) Triethylene glycol-bis-methacrylate) (0,
1 g) and 0.1 g of photopolymerization initiator were dissolved in 25 g of acrylic acid. This solution was added to 50 g of glycerin. Stir this mixture and add 7 g of potassium hydroxide to 10 c of water.
A more 7-composition was obtained by adding the solution contained in c.

On the other hand, a 100#m thick ester film was spread on a glass plate, and a polyester mesh (ester mesh $7,575) sandwiched between a pair of silicone rubber gaskets with a diameter of 2I was placed on top of it. A casting cell measuring 70 x 310 x 2 m with an open top was made by fixing with clamps.

The above-mentioned monomer composition was injected into this casting cell, and the gel was polymerized by irradiating it with U light for about 3 minutes. It maintained its shape and did not peel off.

(Effects) According to the method of this invention, it is possible to easily obtain a reinforced gel sheet with a beautiful surface that does not contain bubbles, and the reinforced gel sheet obtained by the method of this invention has mlK.
Since a part of the support is exposed, it is not only convenient for use, but also has the advantage of not needlessly contaminating the gel surface of the reinforced gel sheet. It is also useful as a clinical bioelectrode.

Claims (1)

[Claims] 1) Place the bottom of the casting cell almost horizontally, place a gel support whose periphery is sandwiched between a pair of gaskets to form a casting cell with an open top; A method for producing a reinforced gel sheet, which comprises injecting a polymerizable monomer composition into a gel and polymerizing it.