JPS63246236A - Conductive porous body and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductive porous body having good thermal conductivity and electrical conductivity, and a method for manufacturing the same.

(Technical background and problems to be solved) Porous bodies, especially polyvinyl acetal (hereinafter referred to as Pv8) based porous bodies, are made of water-soluble polyvinyl alcohol (hereinafter referred to as Pv8), a pore forming agent, and an aldehyde. By reacting with an acid catalyst, the PV
The At-based porous material has excellent chemical resistance, and is characterized by high mechanical strength because it has a three-dimensional network structure with continuous pores with an average pore size of 8 to 1000 μm using the Inanai manufacturing method. The soft material, which is a t'VAL porous material with a low degree of acetalization, is lightweight due to its three-dimensional network structure.
It is used for filter media, water-absorbing materials, cleaning materials, etc. because it has excellent rebound properties, is wood-friendly, and has excellent chemical resistance. Furthermore, PVA with increased degree of acetalization
J-based porous material or PVA combined with thermosetting resin
Hard 7τ material, which is a J-based porous material, is used as an abrasive material because of its high mechanical strength.

- If even better thermal conductivity and electrical conductivity are added to the above-mentioned porous body, its use will be expanded to electric industry fields such as charged filters and electromagnetic wave absorbers.

As an example of conventional manufacturing of a conductive porous body, pores 71
There is a method of adding conductive microparticle powder to the body solution.

However, in the above method, the fine particle powder may be chemically changed by the action of reaction raw materials, solvents, catalysts, etc. contained in the raw solution of the porous body, or decomposed by being exposed to the atmosphere of heating reactions, etc. However, there was a problem in that the functions and characteristics of the fine particle powder were impaired. Furthermore, it is difficult to uniformly disperse fine-particle powder in a porous material, and the porous material covers the fine-particle powder, making it impossible for the fine-particle powder to efficiently demonstrate its characteristics. was there.

Therefore, as an example of a manufacturing method that solves the above-mentioned problems and drawbacks, there is a method of adhering or fusing fine particle powder having an electric property to the outer surface of a porous body.

However, the above-mentioned method has a problem in that the fine particles easily fall off due to friction on the outer surface of the porous body.

(Object of the invention) This invention was made under the above circumstances,
An object of the present invention is to provide a conductive porous body having excellent thermal conductivity and electrical conductivity, and a method for producing the same.

(Means for Solving the Problems) The present invention provides L';I having good thermal and electrical conductivity.
The present invention relates to an electrically conductive porous body, and the object of the present invention is to:
This is achieved by comprising a porous body and a porous body layer to which conductive fine particle powder is attached, and the conductive porous body is made of a thermosetting resin made of conductive fine particle powder. It is added to an aqueous solution to form a dispersion mixture, this dispersion mixture is impregnated into a porous body, the moisture contained in the dispersion mixture is removed by drying treatment, the thermosetting resin is hardened by heat treatment, and the porous body is It can be obtained by attaching the fine particle powder to a body.

(Function of the Invention) In the present invention, conductive fine particles are dispersed and mixed in advance in an aqueous solution of a thermosetting resin, so that they penetrate well into a porous body and are strongly adhered to the porous body.

(Example of the invention) A conductive porous body 50 according to the present invention is shown in FIG.

As shown in the cross-sectional views of FIGS. 2 and 3, the porous 1τ body 5
1 and a porous layer 53 to which conductive fine particles 52 are attached.

Examples of the above-mentioned porous body 51 include I'VAt and ceramic, and are not particularly limited. Further, as the above-mentioned fine particle powder 52, there are, for example, metal powder (silver, copper, gold, aluminum, tin, iron, etc.), metal oxide powder (tin oxide, indium tin oxide, etc.), carbon powder, etc. Further, it may be a mixture of these or a mixture of these and a fine particle powder having no conductivity, and is not particularly limited.

Next, a method for manufacturing the above-mentioned conductive porous body 50 will be explained with reference to FIG. 4.

FIG. 4 is a schematic configuration diagram showing an example of an apparatus for manufacturing the conductive porous material 50, and shows a porous material sheet! The roller 2 has a roller 2 around which the porous sheet 1 is wound, an impregnation tank 3 in which the porous sheet 1 discharged from the roller 2 is buried in the impregnation IA, and a roller 4 which discharges the impregnated porous sheet 1. are doing. Furthermore, a device 5 for drying the porous sheet 1 carried out from the rollers 4, a device 6 for heat-treating the porous sheet 1, and a roller ruff for winding the porous sheet 1 after the above-mentioned treatments are provided.

To explain the operation of the above-mentioned manufacturing apparatus, first, conductive fine particle powder 52 is dispersed and mixed in an aqueous solution of a thermosetting resin, and this dispersion mixture 10 is placed in the impregnating tank 3. Then, the porous sheet 1 is rolled from the roller 2 to the I2 position.
is immersed in the dispersion mixture 10 in the impregnating tank 3, and the inside of the porous sheet 1 is impregnated with the dispersion mixture 10. The impregnated porous sheet is dried by roller 4.
It is carried out to the burial device 5, and the water contained in the impregnated dispersion mixture lO is removed. Furthermore, it is carried out to a heat treatment apparatus 6, and the thermosetting resin impregnated in the porous 71 sheet 1 is cured. At this time, the fine particle powder adheres to the porous material sheet 1 together with the thermosetting resin, so that a conductive porous material 50 as shown in FIG. 1 can be obtained.

FIG. 5 is a schematic diagram showing another example of the manufacturing apparatus for the conductive porous body 50, including ff14f! 3, spray nozzles 20 are provided for each tree on the front and back sides of the porous material sheet 1-1. From these spray nozzles 20, the mixed liquid 10 is sprayed on the front and back surfaces of the porous sheet 1 in the above-mentioned portion 11, and the treatment explained in FIG. A porous body 50 is obtained.

FIG. 6 is a schematic configuration diagram showing still another example of the manufacturing apparatus for the conductive porous body 50, in which instead of j: 24ff3,
Two rollers 31 arranged in parallel on the surface of the porous sheet 1.
32, and the roller 31,
A roller 33 facing one of the rollers 32 is provided. The above-mentioned dispersion mixture lO is stored between rollers 11 and 32 which are arranged in parallel, and these glue rollers 11. :11 on the surface of the porous sheet l by adjusting the gap of 12
A mixed liquid lO is applied thereto, and the porous sheet 1 is conveyed out by opposing rollers 33. Then, the process explained in Figure 414 is applied to form conductive pores as shown in Figure 3.
It is a master of 50 ET bodies.

Instead of the aqueous solution of the thermosetting resin described above, an aqueous solution of its prepolymer or precursor may be used, and a curing medium may be added to these aqueous solutions.

In addition, this thermosetting resin includes, for example, PVA, and its saponification degree is preferably 98.5 mol% or more and 1 m ratio of 1700 or more, and if it deviates from the above range, strong adhesion with excellent water resistance may not be obtained. It disappears. And the PV mentioned above
The concentration of the aqueous solution A is preferably 1 to 5 wt zero; if the concentration is too low, strong adhesion cannot be obtained, and if the concentration is too high, the viscosity becomes high and the dispersibility of the fine particle powder 52 deteriorates. Furthermore, the amount of the fine particle powder 52 added to the l'VA aqueous solution is preferably 1 to 10 wt%; if the amount added is too low, the effect will be poor, and if the amount added is too high, it will not adhere uniformly to the porous body. becomes difficult.

In the above description, the shape of the porous body 51 is a sheet, but the shape is not particularly limited and may be a cylinder.

The drying treatment conditions include a porous body 51 and a fine particle powder 5.
It is sufficient as long as the moisture content can be removed without causing any adverse effect on 2. Although there is no particular limitation, for example, when heating is used, the temperature may be 80°C.
It is best to do the following.

The heat treatment conditions are not particularly limited as long as the fine particle powder 52 adheres firmly, but for example, 110 to 150°C.
It is better to do it with

As mentioned above, since the fine particle powder 52 permeates into the pores of the porous body 51 together with the water-soluble R(M) of the thermosetting resin, the thermosetting resin and the fine particle powder 52 remain even after the drying process.

Then, by heat treatment, the thermosetting resin changes into a water-insoluble film on a relatively surface area of the fine particle powder, and the porous body 51
Since the fine particle powder 52 is attached to the surface, the characteristics and functions of the fine particle powder 52 are not impaired. Furthermore, since the smaller the amount of thermosetting resin attached, the less it affects the physical properties of the porous body 51, it is desirable that the amount of attached thermosetting resin be 10w1% or less with respect to the porous body 51.

Next, a specific example will be described.

Starch and a water-soluble polymer were added as pore-forming agents to the completely saponified Pv with a degree of polymerization of 1700 and an aqueous aldehyde solution 1&, and an acetalization reaction was carried out at 55°C for 10 hours under a sulfuric acid catalyst, resulting in an average pore diameter of 300 μm. A soft polyvinyl acetal porous body with a porosity of 93% was obtained. After washing and dehydrating this porous body, it was immersed in a gelling bath containing 15 jfg/l of sulfuric acid, 20 g of formalin, and 150 kg of water.
After standing in a high-temperature humidified reaction chamber at a temperature of 60°C and a humidity of 90% for 100 hours, a porous sheet was washed, dehydrated, and dried to obtain a porous sheet with an average degree of polymerization of 1700.
5 wL% of PVA with saponification degree of 98.5 mol% or more
70 g/β of aluminum metal powder paste was added to the aqueous solution, and the viscosity was adjusted to 100 CPS/25°C. Then, using the manufacturing apparatus shown in FIGS. 1 to 3, this dispersion mixture was applied to the porous sheet at 3 wL% or more (1 wL%), and after drying at 70°C for 2 hours, it was dried at 150°C for 40 The conductive porous sheet thus obtained exhibited good thermal and electrical conductivity.

(Effects of the Invention) As described above, according to the conductive porous body and the manufacturing method thereof of the present invention, it is possible to easily manufacture a conductive porous body having good thermal and electrical conductivity, thereby reducing costs. be able to. In addition, since it is possible to create a charged filter that has both filtration performance and dust collection performance, it is possible to reduce the number of man-hours and to achieve low pressure drop and high It also has a high collection rate and a large dust holding capacity, allowing for reliable filtration.

Nlno, I

[Brief explanation of drawings]

FIGS. 1 to 3 are cross-sectional views of the conductive porous body of the present invention, and FIGS. 4 to 6 are schematic configuration diagrams showing examples of the apparatus for manufacturing the conductive porous body of the present invention, respectively. . 1... Porous sheet, 5... Drying processing device 1q,
6...Heat treatment device, In...Dispersion mixed liquid, 50...
・Electrically conductive porous material. Applicant's agent Yu Yasugata Three prefectures l Medical #2 Figure 3 Figure 4 Figure 6

Claims (2)

[Claims] (1) A conductive porous body comprising a porous body and a porous body layer to which conductive fine particle powder is attached. (2) Add conductive fine particle powder to an aqueous solution of thermosetting resin to form a dispersed mixture, impregnate a porous body with this dispersed mixture, and remove water contained in the dispersion mixture by drying. A method for manufacturing a conductive porous body, characterized in that the thermosetting resin is cured by heat treatment, and the fine particle powder is adhered to the porous body.