JPH0415355Y2 - - Google Patents

Description

[Detailed explanation of the idea]

"Purpose of the invention" The present invention relates to the invention of an aeration mechanism, and aims to provide an aeration means capable of dispersing air in the form of fine bubbles into water. Industrial applications: Diffusion mechanisms in wastewater treatment equipment, fish and shellfish or microorganism breeding equipment. Conventional technology In order to supply oxygen and other gaseous components to the liquid in wastewater treatment and breeding facilities for microorganisms, fish and shellfish, etc., oxygen and other gaseous components are added and dissolved in the liquid as air bubbles using an aeration means with fine holes such as an aeration pipe. This has been commonly done for a long time. That is, a mechanism is adopted in which air is diffused through holes drilled in a metal pipe or through holes in a sintered metal structure, or through a porous resin structure. Problems that the invention aims to solve: A metal pipe with perforations requires a lot of man-hours to manufacture, and the bubbles in the liquid cannot be made sufficiently fine by aeration, so contact between the liquid and the gas is difficult. I can't get enough. In the case of a sintered metal structure, a certain layer thickness is required, and the pressure for ejecting gas from the structure is high. Therefore, it is necessary to further refine these materials by applying ultrasonic waves or the like, which increases equipment costs and operating costs. In addition, metal ions elute into the liquid and cannot be used as equipment for breeding microorganisms, and they lack corrosion resistance, so they cannot be used favorably from this point of view. ``Structure of the invention'' Means for solving the problems An air diffusion mechanism characterized by forming a perfluoro ion exchange resin coating on a porous material made of polytetrafluoroethylene. Effect Hydrophilicity is imparted to the hydrophobic polytetrafluoroethylene porous material by forming the perfluorinated ion exchange resin coating. For the polytetrafluoroethylene porous tissue material that has obtained hydrophilic properties as described above, liquids such as water can appropriately enter and adhere to the tissue material, and be ventilated in this state. The gas bubbles dispersed in the tissue are effectively miniaturized. The perfluorinated ion exchange resin coating becomes semi-permanent by heating and fixing, and maintains the above-mentioned fineness effect for a long period of time. In addition, as mentioned above, products made of polytetrafluoroethylene and perfluoro ion exchange resins do not generate eluted ions, and have excellent ozone resistance when bubbling ozone to achieve sterilization and bleaching effects. Even when gas is bubbled into an etching solution (concentrated sulfuric acid) in a semiconductor manufacturing process, the strong acid resistance and heat resistance are sufficient, and the corrosion resistance is also sufficiently high. Examples Specific embodiments of the present invention as described above are explained as shown in the attached drawings.
In the present invention, a polytetrafluoroethylene porous structure material 1 is generally used as a tubular body 5 as shown in FIG. 1, but in some cases, an air supply mechanism 6 as shown in FIG. It may also be a sheet-like body 7 whose open surface is covered. However, as shown in FIGS. 3 and 4, one example of the microscopic structure of the porous tissue described above is that a large number of micro nodules 11 are connected by countless fine fibers 12, that is, the micro nodules 11 are The fine fibers 12 are formed in a spider web shape between the fine fibers 1.
In the present invention, a perfluorinated ion exchange resin coating 4 is applied to the surfaces of the micro nodules 11 and the fine fibers 12, as shown in FIG. be. To form the perfluorinated exchange resin coating 4 described above, the polytetrafluoroethylene porous structure material 1 described above is impregnated with a perfluorinated ion exchange resin solution, and the coating 4 is heat-set by heating to about 200 to 280°C. . The porous structure material 1 described above is obtained by subjecting a polytetrafluoroethylene membrane material to rolling or stretching, or a combination of both, and its pores 13 have a maximum pore diameter of 0.02 to 10 μm. That's about it. To explain a specific manufacturing example of the product according to the present invention as described above, the thickness is 0.5 mm and the hole diameter is 1.
A pipe-shaped polytetrafluoroethylene porous material 1 with a diameter of ~3 μm and a porosity of 80%, an outer diameter of 10 mm, and a length of 10 cm, was soaked in a 5% perfluoro ion exchange resin solution for 1 minute. 250 after soaking
The product was heat-treated at ℃. For comparison, we separately prepared a material that was not treated with the ion exchange resin solution, and performed aeration of air bubbles in water for the present material and the comparative material.The results are shown in the table below. can be,
The air supply pressure for the aeration is 0.3Kg/cm ² G.
It is.

[Table] In other words, it was confirmed that the number of bubbles in the device according to the present invention is more than 100 times the amount of airflow, making the bubbles extremely fine and achieving efficient gas-liquid contact. "Effects of the invention" As explained above, the invention makes it possible to make the bubbles caused by aeration extremely fine, to achieve efficient gas-liquid contact, to dissolve oxygen and other substances in the liquid, and to prevent the elution of metal ions. Since it does not cause corrosion, it is a highly effective idea in practical terms.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Figures 1 and 2 are external views showing the overall configuration of the aeration mechanism according to the present invention, and Figures 3 and 4 are microscopic views of the fiber structure of the polytetrafluoroethylene porous material. FIG. 5 is an enlarged diagram showing an example of the formation of a perfluorinated ion exchange resin coating on the micronodules and fine fibers. In these drawings, 1 is a polytetrafluoroethylene porous tissue material, 4 is a perfluorinated ion exchange resin coating, 5 is a tubular body, 6 is an air supply mechanism, 7 is a sheet-like body, 11 is a micro nodule, 12 13 indicates fine fibers, and 13 indicates pores.

Claims (1)

[Scope of utility model registration request] An air diffusion mechanism characterized by forming a perfluorinated ion exchange resin coating on a porous material made of polytetrafluoroethylene by thermal fixation.