JP2583151B2 - Method for producing deodorant composite material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a deodorizable composite material.

(Prior Art) Conventionally, an adsorbent material in which an adsorbent is fixed to various porous substrates has been used to remove odors and other trace components in a gas or liquid.

Various proposals have been made for such adsorption materials.
As a typical example, there is an adsorbent material in which an adsorbent is dispersed in various binder components such as a polymer emulsion or a water-soluble polymer and impregnated or applied to a porous base material. Also, in this adsorbent material, since the binder may cover the surface of the adsorbent considerably and the adsorbing performance may not be exhibited, it is necessary to apply the binder to the porous substrate in advance and fix the adsorbent. Improvements have been proposed.

(Problems to be Solved by the Invention) However, in the improved adsorbent material, the porous substrate and the adsorbent are only partially adhered to each other, so that the adsorbent is inevitably dropped. In order to prevent this, it is recommended to further apply a binder to the surface layer of the adsorbent. As a result, the adsorbent on the surface layer can be prevented from falling off to some extent, but the adsorbent inside the porous substrate cannot be dropped off, and the adsorbing ability is reduced.

JP-A-59-48242 discloses a method for producing an adsorptive sheet from a slurry containing cationic inorganic fibers, activated carbon and an anionic binder by a wet papermaking method. However, this method has a hygienic problem because it uses asbestos fiber and the like.

The present inventors have worked diligently to obtain an adsorbent material free from the above-mentioned drawbacks. As a result, the porous substrate and the adsorbent are bonded and fixed with a binder, and the surface is treated with a specific compound. The present inventors have found that the agent can be prevented from falling off, and that the deodorizing performance is also improved, and further studies based on this finding have led to the completion of the present invention.

(Means for Solving the Problems) Thus, according to the present invention, an adsorbent is fixedly adhered to a porous substrate with a binder, and then aluminum sulfate and a sulfate of a transition metal are contained. A method of manufacturing a material is provided.

The porous substrate used in the present invention has a porosity of 0.3%
The above is a porous substance. Specific examples thereof include foamed resin, non-woven fabric, paper, cloth and the like, and among them, polyurethane foam and non-woven fabric are preferable. There is no limitation on the diameter, shape, etc. of the pores of these porous substances.

The adsorbent used in the present invention has a specific surface area of 50 m ² / g or more, preferably 100 m ² / g or more, and specific examples thereof include activated carbon, silica gel, alumina, zeolite, clay, bentonite, and diatomaceous earth. Soil, acid clay, and the like. Among them, activated carbon is preferred. The shape of the activated carbon may be any of powdered charcoal and granular charcoal, and the raw material may be any of plant-based wood, coconut shell, mineral-based coal, petroleum residue, and the like.

In the method for producing a deodorizable composite material of the present invention, the weight ratio between the porous substrate and the adsorbent is usually from 1:10 to 100: 1. When the amount of the adsorbent is small outside this range, the deodorizing performance is inferior. On the other hand, when the amount is outside this range, there are portions where the adhesive fixation to the porous substrate is insufficient.

The binder used in the present invention is not particularly limited. Specific examples include a synthetic resin emulsion adhesive, a rubber latex adhesive, a solvent-type adhesive obtained by dissolving various rubbers and resins in a solvent, and the like. Further, an inorganic compound adhesive such as water glass, enamel and glaze may be used.

The amount of the binder used varies depending on the types and amounts of the adsorbent and the porous base material, but is usually in a range where the weight ratio between the adsorbent and the binder is 1: 5 to 20: 1. If the amount of the binder is too large, the deodorizing performance is reduced, and if the amount is too small, the adsorbent is insufficiently adhered and fixed to the porous substrate.

The method of bonding and fixing the porous substrate and the adsorbent may be a conventionally known method. For example, a method of impregnating or applying a binder to a porous base material in advance, and then scattering and adsorbing an adsorbent on the surface is used. Alternatively, the porous substrate may be impregnated or coated with a synthetic resin emulsion or the like in which an adsorbent is dispersed.

In the method of the present invention, after the adsorbent is bonded and fixed to the porous substrate with a binder, aluminum sulfate and a sulfate of a transition metal are further contained.

Aluminum sulfate used in the present invention may be anhydrous or hydrated.

The sulfate of the transition metal used in the present invention is IB, IIB, IIIB, IVB, VB, VIB, VIIB of the periodic table of the short period type.
And VIII-group metal sulfates, among which sulfates of the first transition series elements, particularly sulfates of copper, zinc, iron, cobalt and nickel, are preferred. These transition metal sulfates may be used alone or in a combination of two or more.

The mixing ratio of aluminum sulfate and transition metal sulfate can be appropriately selected, but usually, the weight ratio of aluminum sulfate and transition metal sulfate is 100: 1 to 1: 2 in terms of anhydrous salt, preferably 10: 1 to
The range is 1: 1. If the ratio is extremely outside the above range, the adsorbent may fall off, or the adhesion of aluminum sulfate and sulfate of transition metal to the porous substrate may be weakened.

In the method for producing a deodorizable composite material of the present invention, the aluminum sulfate and the sulfate of the transition metal have a total weight (in terms of anhydrous salt) and a weight ratio of the adsorbent of 1: 100 to 1: 2, preferably 1: 1: Use so that it becomes 100-1: 5.

In the method for producing a deodorizable composite material of the present invention, an adsorbent is adhered and fixed to a porous substrate with a binder, and further contains aluminum sulfate and a sulfate of a transition metal. In the method of the present invention, the method of including a sulfate in the porous substrate to which the adsorbent is fixed or in the adsorbent fixed to the porous substrate is not particularly limited, but usually, aluminum sulfate and transition metal A method of impregnating with a sulfate solution, spraying with a spray, or applying an aqueous solution can be employed. In these methods, it is not always necessary to simultaneously contain aluminum sulfate and a sulfate of a transition metal. If necessary, after the sulfate is contained in the porous substrate or the adsorbent, the solvent used for the impregnation or the like can be removed by heating.

According to the above method, it is possible to obtain a deodorizable composite material in which the adsorbent is less likely to fall off.

In the method for producing a deodorizable composite material of the present invention, existing deodorants, deodorants, germicides, and fungicides can be used in combination as long as the effects of the present invention are not impaired.

(Effect of the Invention) According to the method for producing a deodorizing composite material of the present invention, a deodorizing composite material can be obtained in which the adsorbent is less likely to fall off and the deodorizing performance is more excellent than in the prior art. .

The adsorptive composite material obtained by the method of the present invention can be used alone or in combination with another porous substrate or adsorbent, or in combination with an electret nonwoven fabric or the like, and can be used as a deodorizing filter such as an air purifier, It can be widely used as a material for deodorization and adsorption.

(Example) Hereinafter, the present invention will be described more specifically with reference to examples. Parts and% in Examples and Comparative Examples are based on weight unless otherwise specified. The weight of the latex is in terms of solid content.

Example 1 Polyurethane foam having a three-dimensional skeleton as a porous substrate (Everlight Scott HR-08, size thickness 10 mm)
× length 100mm × width 100mm, weight 2.8g, Bridgestone)
2 g of acrylate latex (Nipol LX825, manufactured by Zeon Corporation) was applied. As an adsorbent, 6 g of coconut shell activated carbon (Diasorb-W, 30-60 mesh, manufactured by Mitsubishi Kasei Kogyo Co., Ltd.) was uniformly dispersed and adhered, and then dried at 120 ° C. for 30 minutes. Next, 18 parts of aluminum sulfate (13-14 hydrate, manufactured by Kishida Chemical Co., Ltd., first grade) and 2 parts of copper sulfate pentahydrate are dissolved in 80 parts of water, and impregnated with a 20% aqueous solution. 3 in ℃
After drying for 0 minutes, a deodorizable composite material 1 containing 1.0 g of sulfate (in terms of anhydrous salt) was obtained.

Examples 2 to 7 Deodorizing composite materials 2 to 7 were obtained in the same manner as in Example 1 except that the amount of aluminum sulfate and the type or amount of the sulfate of the transition metal were changed as shown in Table 1.

Example 8 In place of polyurethane foam, a nonwoven fabric (a nylon nonwoven fabric having a fiber diameter of 15 denier, thickness 10 mm × length 100 mm × width 100 mm,
A deodorant composite material 8 was obtained in the same manner as in Example 1 except that the weight was 2.0 g).

Example 9 Silica gel (microbead silica gel, 30-200 mesh, Fuji Devison Chemical Co., Ltd.) as an adsorbent
Deodorizing composite material 9 was obtained in the same manner as in Example 1 except for using

Example 10 Coconut shell activated carbon (Diasorb-F, 100
A deodorizable composite material 10 was obtained in the same manner as in Example 2, except that 1 g of a mesh or less (manufactured by Mitsubishi Kasei Kogyo Co., Ltd.) was used and the amount of sulfate carried was 0.2 g.

Example 11 A deodorizable composite material 11 was obtained in the same manner as in Example 10, except that the amount of activated carbon was 0.5 g, the amount of LX825 was 2 g, and the amount of sulfate carried was 0.1 g.

Comparative Examples 1 to 5 Deodorizing composite materials 12 to 16 were prepared in the same manner as in Example 1 except that the porous substrates shown in Table 1 were used and aluminum sulfate and / or a sulfate of a transition metal were not used. Obtained.

Example 12 A test piece prepared by cutting each deodorizing composite material obtained in each of the above Examples (thickness: 10 mm × length: 10 mm × width: 25 mm; for Experiment Nos. 10 and 11, respectively, the thickness was 10 mm × Length 60mm ×
Those having a width of 25 mm, a thickness of 10 mm, a length of 100 mm and a width of 50 mm were used. ) Was placed in a 150 ml glass container, the inside was replaced with air containing 5% ammonia gas, and the container was immediately sealed.
After standing for 2 hours, the amount of ammonia in the gas phase was measured by gas chromatography to evaluate the ammonia deodorizing performance.

In the same manner, hydrogen sulfide deodorizing performance was evaluated using air containing 5% hydrogen sulfide. Table 1 shows the results.

In addition, test specimens (thickness 10
(mm x 50 mm x 100 mm) were rubbed and rubbed 10 times, and the amount of adsorbent dropped off was examined. Based on the results,
It is shown in the table.

From the results in Table 1, it can be seen that the deodorizing composite material obtained by the method of the present invention has excellent deodorizing performance and has a small amount of adsorbent, while using aluminum sulfate and / or a sulfate of a transition metal. If no, the deodorizing performance is inferior and the adsorbent often drops off.

Claims (1)

(57) [Claims] 1. A method for producing a deodorizable composite material, comprising adhering and fixing an adsorbent to a porous substrate with a binder, and then adding aluminum sulfate and a sulfate of a transition metal.