JPH0134087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an integrated structure of a gasket and a mesh for use in a dialysis device or a filtration device, and is particularly suitable for using a gasket made of plastic such as vinyl chloride resin. The present invention provides a method for manufacturing a chemical structure.

In general, fixing and integrating a gasket used in a dialysis device or a filtration device with a mesh spacer placed in the central notch of the gasket allows the position of the spacer to be stably maintained and the liquid to be treated in dialysis or filtration to be It maintains a good flow state, prevents the dialysis membrane or filtration membrane from falling into the gap between the spacer and gasket caused by misalignment of the spacer, and improves the efficiency of the assembly work of the dialysis device or filtration device. There are advantages.

Conventionally, as a method for fixing and integrating a gasket and a mesh spacer, it is common to use an adhesive such as an epoxy adhesive, a rubber adhesive, or a hot melt adhesive. However, with conventional methods using adhesives, the curing time of the adhesive part is long, the curing of the adhesive part is large, the elasticity of the adhesive part is insufficient, and it is difficult to make the thickness of the adhesive part almost the same as the thickness of the gasket. There is no solution to all of the drawbacks such as difficulty in adjusting the thickness, weak adhesive strength, and shortened lifespan of the bonded portion. Therefore, when an integrated structure of a gasket and a mesh spacer is alternately arranged and pressure-contacted with a dialysis membrane or a filtration membrane to form a dialysis device or a filtration device, the dialysis membrane or filtration membrane as well as the gasket may be lost. There were drawbacks such as poor work efficiency. In particular, recently, plastic gaskets such as vinyl chloride have been used instead of conventional soft rubber gaskets because they can be manufactured into thin shapes and have excellent dimensional stability and strength. In some cases, the above-mentioned drawbacks become more noticeable. Therefore, the need to solve the above problems is increasing.

The present invention provides a method for manufacturing an integrated structure of a plastic gasket and a mesh which eliminates these drawbacks. That is, in the present invention, a mesh is placed in the notch of a gasket made of vinyl chloride resin having a notch in the center, a vinyl chloride resin mixed with 70 to 150 phr of plasticizer is interposed between the two, and the resin is This is a method for manufacturing an integrated structure of a gasket and a net-like material, which is characterized by fixing the gasket and the net-like material by heat-pressing.

The most important feature of the present invention is that when integrating them, a vinyl chloride resin containing an excess amount of plasticizer is interposed between the two, and the vinyl chloride resin is heat-pressed to fix the gasket and the net.

FIG. 1 shows one embodiment of an integrated structure in which a net-like material and a gasket are fixed by the method of the present invention. A mesh material 2 is placed in the central notch of the gasket 1, and a mesh material 8
Vinyl chloride resin containing an excessive amount of plasticizer is interposed at certain points, and this is heat-pressed to form an integrated structure. Reference numeral 3 is a fixed location. Of course, the entire peripheral portion of the mesh 2 may be fixed to the gasket. Further, on both sides of the gasket 1, communication holes 4 for supplying and discharging the liquid to be treated are provided as necessary.

In the present invention, the mesh is made of plastic, which is conventionally used in electrodialysis devices, diffusion dialysis devices, filtration devices, and the like. For example, those made of vinyl chloride such as soft vinyl chloride and hard vinyl chloride; polyethylene, polypropylene,
Examples include ethylene-vinyl acetate copolymer, but polyethylene is preferred. Gasket is 0.5
A sheet-like material with a thickness of ~2.0 mm is generally used. or,
In this specification, the net-like material is a general term for those conventionally used as spacers disposed in the central notch of a gasket, and is generally of a shape such as plain weave, honeycomb weave, mikoshiro weave, or diagonal hole. .

The vinyl chloride resin used in the present invention contains an excessive amount of plasticizer. In general, the amount of plasticizer used to improve the physical properties of plastic products, such as hardness and tensile properties, is, for example, in the case of vinyl chloride, 50 parts by weight per 100 parts by weight of resin.
Although it is about parts by weight, in the present invention, it is not to the extent that it is blended in such general products,
"Excess" means an amount greater than that amount. For example, 70 to 150 phr for resin, especially 90 to
110 phr is preferably blended. If the amount of plasticizer blended is small, the hardness of the bonded area is high and the elasticity is insufficient, making it difficult to adjust the thickness so that the thickness of the bonded area and the gasket are the same. Further, if the hardness is high, it is difficult to cut the material into an appropriate size when performing the integration work, resulting in a decrease in work efficiency. On the other hand, if it is blended in too much, it becomes too soft and not only the desired effects as described below cannot be obtained, but also the workability decreases.

As the plasticizer used in the present invention, any known plasticizer used for plastic resins can be used without particular limitation. For example, for vinyl chloride resins that are preferably used, phthalate esters such as dibutyl phthalate, di-2-ethylhexyl phthalate, and butyl lauryl phthalate; linear dibasic acid esters such as dioctyl adipate and dioctyl azelate; phosphoric acid Esters etc. are used. Further, these plasticizers may be used in combination with a solvent such as tetrahydrofuran, if necessary.

In order to interpose the vinyl chloride resin containing an excessive amount of plasticizer between the gasket and the net-like material and heat and press them to fix and integrate them, for example, the vinyl chloride resin containing an excessive amount of plasticizer is formed into a sheet. All you need to do is cut it to an appropriate size, place it between the gasket and the net-like fixing point, and heat it under light pressure for 5 to 30 seconds using a trowel heated above the melting point of the resin. In addition, in order to improve fixing workability and fixing strength and eliminate flow obstruction in the dialysis chamber or filtration chamber during use, a part of the gasket surface is cut out (the part marked 3 is cut out) as shown in Figure 1. A particularly preferred embodiment is a method in which both the gasket 1 and the net-like material 2 are heat-pressed at the relevant location via a vinyl chloride resin containing an excessive amount of plasticizer.

In the present invention, the vinyl chloride resin containing an excessive amount of plasticizer is bonded under heat and pressure to fix the net and the gasket. However, this means that the vinyl chloride resin and the gasket or the net are not necessarily bonded to each other at the fixing location. It is not necessary to do so. Of course, in general, if the gasket is bonded, there will be no misalignment between the fixed gasket and the mesh, and the fixation will be more complete. However, in the present invention, in addition to being fixed by adhesion, the vinyl chloride resin mixed with an excessive amount of plasticizer that has been bonded under heat and pressure is embedded in the mesh of the net-like material, so that the vinyl chloride resin and the net-like material are bonded together. Even if so-called adhesion is not performed between the two, there is a mode in which they are fixed. In addition, when placing and fixing a net-like material in the central notch of the gasket, the vinyl chloride resin is heat-pressed so that the cross section becomes, for example, H-shaped, and the peripheral parts of the gasket and the net-like material are placed in the upper and lower recesses of the H-shape. An example of this is a mode in which they are inserted and fixed.
Because they are fixed in this manner, the present invention can satisfactorily fix a soft mesh material and a hard gasket, which are generally difficult to heat-seal. In addition, since the fixing (adhesion) part is made of vinyl chloride resin, it is elastic and prevents damage to the dialysis membrane, filtration membrane, gasket, etc., which was a problem when using conventional epoxy adhesives or hot melt adhesives. But not at all. Furthermore, the fixing work can be done extremely easily and efficiently. Furthermore, the fixing strength and the thickness accuracy of the fixed portion are also good.

Hereinafter, the present invention will be explained in detail based on examples.

Example 1 A mixture of 100 parts of vinyl chloride resin, 100 parts of dioctyl phthalate, and 500 parts of tetrahydrofuran was mixed and stirred, the resulting paste-like material was spread in a vat, and the solvent was evaporated to form a soft, elastic material.
A 0.4 mm plastic sheet was obtained. From this sheet, a 4 mm square piece of vinyl chloride sheet for adhesion was cut out. Using this small piece, we fixed and integrated a 1 mm thick soft PVC gasket with a dialysis area of 10 dm ² as shown in Figure 1 and a polyethylene mesh spacer placed in its center notch. .

The working conditions were a fixing time of about 10 seconds at each location and a fixing temperature of 80°C. Average production time is 14 pieces/1
It was hot for 1 hour.

In addition, the finished state was such that the thickness of the bonded portion was almost the same as the thickness of the gasket, the bonding strength was sufficient, and the lamination work of the gasket and the fusing film was efficient.

In addition, in the past, this type of lamination work required two people about 5 hours to laminate 200 pairs if the mesh and gasket were not fixed and integrated, but the integrated structure of the mesh spacer and gasket of the present invention Using this, two people could do it in two hours.

Next, the diafiltration device constructed using this integrated structure of the mesh spacer and gasket was used for 6 months, and during this period it was stacked and disassembled three times, but the fixed part of the gasket and the mesh spacer was Excellent results were shown even in use, with no separation of any parts, and no damage to any of the ion exchange membranes as fused membranes.

Comparative Example 1 The same gasket and spacer as in Example 1 were used, and the blending ratio of the adhesive vinyl chloride sheet was 100 parts of vinyl chloride resin, 30 parts of dioctyl phthalate, and 500 parts of tetrahydrofuran, and the same as in Example 1. After mixing, stirring, and volatilizing, an elastic sheet-like integrated structure was manufactured.

In this case, the manufacturing time of the integrated structure is approximately 8
It took 1 person/1 hour. This integrated structure
We stacked 30 pairs and observed how they were used, but found that there were two external fluid leaks due to the lack of flexibility in the bonded parts, and when we disassembled the dialysis machine, we found that the bonded parts had come off in five places due to ion exchange. It was discovered that the membrane was broken in 10 places, making it impossible to put it into practical use.

[Brief explanation of drawings]

FIG. 1 shows one embodiment of an integrated structure in which a mesh and a gasket are fixed by the method of the present invention. In the figure, 1 is a gasket, 2 is a mesh, and 3 is a gasket.
Reference numeral 4 indicates a fixed location, and 4 indicates a communication hole for supply/discharge.

Claims (1)

[Claims] 1 A mesh material is placed in the notch of a gasket made of vinyl chloride resin having a notch in the center, a vinyl chloride resin containing 70 to 150 phr of plasticizer is interposed between the two, and the resin is heat-pressed to form a gasket. A method for manufacturing an integrated structure of a gasket and a net-like material, characterized by fixing the net-like material.