JPH046898Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on fibrous activated carbon (hereinafter sometimes simply referred to as ACF) or powdered activated carbon (hereinafter referred to simply as ACF).
(sometimes simply written as AC) is the original adsorption property,
The present invention relates to a two-dimensional adsorbent material that maintains surface area and has good mechanical properties and conductivity.

ACF and AC have a high degree of adsorption, extremely large surface area, and good electrical conductivity. Taking advantage of these properties, they are widely used as adsorbent materials and other applications such as electrostatics, hazardous substance removal, and gas separation. ing. In order to expand their applicability to these uses, it is necessary to make ACF and AC into structures such as two-dimensional surfaces and films, and various attempts have been made and implemented in the past.

Current two-dimensional structures include ACF, which spins, knits, and weaves organic fibers such as polynosic rayon and phenolic fibers, then carbonizes and activates them to create AGF cross-shaped two-dimensional structures. A commonly practiced method is to produce ACF and then use it to make a nonwoven fabric to obtain a similar structure. On the other hand, in AC, AC is added to a resin liquid such as urethane or acrylic, and if necessary, a two-dimensional structure is obtained by molding with foaming treatment, or it is applied to a base material such as fabric or non-woven fabric. A structure in which a resin liquid is applied has been proposed.

However, these two-dimensional structures have many defects, and in practical terms, their use may require restrictions, or may involve sacrificing basic performance such as adsorption performance, making it unavoidable to put them into practical use. The current situation is that In other words, the aforementioned ACF cloth and nonwoven fabric are preferable in that they do not impair the basic performance of ACF, but since ACF itself is extremely fragile, the resulting structure is naturally fragile and its structure can be destroyed by stress such as slight bending. This results in significant practical limitations. On the other hand, AC
However, since the resin liquid adheres to the surface, there is a problem in that the adsorption performance, especially the adsorption speed, is significantly reduced, and the conductivity is also reduced.

The inventors of the present invention tried to change their way of thinking in order to solve this problem, and as a result of their earnest efforts, they applied ACF short fibers or AC particles to a conductive base material layer having sufficient strength for practical use through a conductive adhesive layer. By fixing and integrating only a small portion of each of these surfaces with this adhesive layer, it does not have the above problems, maintains the high adsorption, large surface area, and good conductivity of activated carbon, and also eliminates these drawbacks. The present invention was completed by discovering the structure of an adsorbent material with improved mechanical properties.

In other words, the present invention provides a base material layer made of conductive knitted fabric, non-woven fabric, felt, paper, etc., with a tensile strength per unit cross-sectional area of 1 kg/cm ² or more, which is conductive on one or both sides. Through the adhesive layer,
It is an adsorption material that has a structure with an ACF or AC layer. Here, the volume specific electrical resistance of the base material layer and the adhesive layer is preferably 10 ⁵ cm・Ω or less, and the
The fiber length of ACF is in the range of 0.1 mm to 20 mm, and
Its surface area per unit weight is 500m ² /g or
4500m ² /g is preferred. On the other hand, the average particle size (diameter) of AC is preferably in the range of 1 μm to 500 μm. Further, it is more preferable that the ACF disposed via the adhesive layer be substantially perpendicular to the base material layer.

The conductivity and mechanical properties of the base material used here must be taken into consideration, and the air permeability and liquid permeability may be appropriately selected depending on the requirements of the application. From these points, materials that can be used include, for example, metal-plated fibers, metal fibers, carbon fibers, conductive fine powder mixed yarn-proof fibers, conductive resin-coated organic fibers, metal-coated cloth, non-woven fabrics, felt, paper, etc. It is possible. The reason why the tensile strength of the base material was limited to 1 Kg/cm ² or ^more is that the mechanical properties of the base material affect the mechanical properties of the adsorbent material of the present invention. This is because it is a hindrance and impairs the usefulness of the present invention.

The volume specific electrical resistance of the base material layer and adhesive layer is set to 10 ⁵ Ω・
The reason why the thickness is set to be less than cm is that if it is more than this, sufficient conductivity cannot be obtained and the electrostatic removal property and other electrical properties are deteriorated.

As mentioned above, in the adsorbent of the present invention, both the base layer and the adhesive layer must have conductivity, which makes the adsorbent of the present invention suitable for use as an air filter or as an adsorbent for flammable drug gases. When used, it becomes possible to provide antistatic, antistatic, and static neutralizing properties, and as a result, dust explosions, flammable explosions, clogging, etc. can be avoided.

The reason why the average fiber length of ACF is set to 0.1 mm to 20 mm is that if it is less than 0.1 mm, there will be problems with productivity, the price will be high, and the rate of being buried in the adhesive layer will be high.
This is because the adsorption property decreases, and if the diameter is 20 mm or more, even the present invention cannot suppress the fragile nature of the ACF, increasing the risk of the ACF breaking or falling off when mechanical force is applied. Also, the surface area per unit weight is between 500m ² /g and 4500m ² /g.
The reason why this range is preferable is that the adsorption performance is too low if it is less than 500 m ² /g, and conversely, if it is more than 4500 m ² /g, the ACF is too fragile and cannot be handled by the present invention. On the other hand, the reason why the average diameter of AC is set to 1 μm to 500 μm is that if it is less than 1 μm, the packing density will be low, and the areal density (fabric weight) of AC
This is because the AC becomes too low, and in the case of the present invention, only a small portion of the AC is retained by the adhesive layer, increasing the risk of it falling off when mechanical stress is applied.

In addition, when disposing ACF on the base material layer via the adhesive layer, the reason why it is preferable to arrange it almost perpendicularly to the base material layer is that the rate of ACF being buried in the adhesive layer is extremely low, and the reason is that This is because it is easier to demonstrate the features of the invention, and specifically, electric flocking is a particularly effective method.

Examples of adhesives that can be used here include epoxy, acrylic, and phenol adhesives.
Conductivity may be imparted to these by any method such as adding conductive carbon or fine metal powder, and the material of the AC does not need to be particularly restricted; commonly used palm Pulverized shell activated carbon etc. are possible.

Although this invention assumes adsorption materials,
There is no need to avoid other uses; for example, by taking advantage of its large surface area and conductive properties, it can be applied to various electrical materials.

The invention will be explained below with reference to the drawings and examples.

Example 1 A fabric made of nickel-plated polyvinyl alcohol fiber with a strength per unit cross-sectional area of 200 kg/cm ² was used as the base material layer, and an acrylic ester adhesive containing carbon and fine nickel powder was applied to one side of the fabric.
After coating with a thickness of 10 μm, phenolic ACF with a fiber length of 0.5 mm and a surface area per unit weight of 1500 m ² /g was processed using the electro-flocking method to obtain an ACF fabric weight of 50.
g/m ² of the adsorbent material of the present invention was obtained. Both the base material layer and the adhesive layer have a volume specific electrical resistance value of 10 ⁵ Ω·cm or less.

On the other hand, as a comparative example, phenolic fiber was spun and
A cloth that had been woven, carbonized, and activated and had an ACF area weight of 50 g/m ² was used.

Both were evaluated for adsorption, antistatic properties, and mechanical properties. The adsorption properties were measured using benzene vapor according to the JISK-1474 method, and both users showed an adsorption amount of 25 g/ ^m2 , and the antistatic properties were measured using nylon cloth according to JISM7102 at 22°C.
When the charge density was measured under the conditions of ×30% RH, both exhibited good performance of 0.1 μc/m ² or less.
On the other hand, when both were lightly touched to evaluate their mechanical properties, the one of the present invention had no damage, but the one of the comparative example suffered extensive damage.
It was impossible to even maintain its shape.

Example 2 Using the same base material layer and adhesive as in Example 1, coconut shell activated carbon (AC) with an average diameter of 260 μm was processed into a product of the present invention with a basis weight of 120 g/m ² by electro-flocking.

As a control example, the same base material and adhesive as in the present invention were used, and the same AC as above was added to the adhesive.
AC basis weight 120 due to knife coating on the base material
A processed fabric of g/m ² was obtained.

When the above two types were placed under benzene saturated vapor pressure at 25°C and the adsorption amount was measured after 30 minutes, the adsorption amount of the present invention was 40 g/m ² , while the comparative example was 15 g/m ² This proves that the present invention is superior.

Example 3 A fabric woven from stainless steel metal fibers (tensile strength of 1 Kg/cm ² or more) was coated with 10 μm of phenolic adhesive containing fine carbon powder on one side, and then the ACF of Example 1 was applied by electro-flocking method. As a result, an adsorbent material with an ACF area weight of 45 g/m ² was obtained. Both the volume specific electrical resistance values of the base material layer and adhesive layer are
10 ⁵ Ω・cm or more.

It was found that this adsorbent material had excellent adsorption properties, antistatic properties, and mechanical properties as in Example 1, and also had a high degree of heat resistance.

[Brief explanation of drawings]

FIG. 1 shows an example in which ACF is arranged on one side of a base material layer via an adhesive layer, where 1 is the base material layer, 2 is the adhesive layer, and 3 is the ACF layer. FIG. 2 shows an example in which ACF is disposed on both sides of the base material layer via an adhesive layer, and the contents of 1 to 3 are the same as in FIG. 1. In FIG. 3, AC is arranged on one side of a base material layer via an adhesive layer, where 1 is the base material layer, 2 is the adhesive layer, and 3 is the AC layer.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A base material layer made of conductive knitted woven fabric, non-woven fabric, felt, paper, etc. and having a tensile strength per unit cross-sectional area of 1 Kg/cm ² or more, on one or both sides thereof. An adsorption material with a fibrous activated carbon layer or powdered activated carbon layer interposed between a conductive adhesive layer. 2 The volume specific electrical resistance of the base material layer and adhesive layer is
The adsorbent material according to claim 1 of the utility model registration claim, which has a resistance of 10 ⁵ Ω·cm or less. 3 The average fiber length of the fibrous activated carbon is 0.1 mm to 20
The adsorbent material according to claim 1, which is registered as a utility model and has a surface area of 500 m ² /g to 4500 m ² /g. 4 The average diameter of powdered activated carbon is 1 μm to 500 μm
The adsorbent material according to claim 1 of the utility model registration claim, which is within the scope of. 5. The adsorption material according to claim 1, wherein the fibrous activated carbon is arranged substantially perpendicularly to the base material layer.