JPH0534981B2 - - Google Patents

Description

[Detailed description of the invention]

(Field of Industrial Application) The present invention relates to a deodorizing material, and more particularly to a deodorizing material suitable for filters, masks, diapers, bedding sheets, etc. for the purpose of deodorizing. (Prior Art) Conventionally, deodorizing materials have often been used as indoor deodorizers by spraying or scattering them in a liquid or powder state, but they have also been used by impregnating or supporting various substrates. It is also used in combination with other materials such as Among various base materials, nonwoven fabrics are porous fiber aggregates made of various fibers and binders, and are used in filters and various sanitary materials because of their good breathability and absorbency. It is a material that can be expected to have a variety of uses when combined with deodorizers. For this reason, combinations of nonwoven fabrics and various deodorizing agents have been studied. For example, Japanese Patent Application Laid-Open No. 62-33854 discloses a deodorizing nonwoven fabric using fibers carrying metal phthalocyanine. However, in the case of this nonwoven fabric, it takes a long time to introduce the compound with deodorizing performance into the fibers, which causes problems in productivity. also up to 20
%, and there is a limit to the magnitude of the deodorizing effect. (Problems to be Solved by the Invention) As a result of intensive research by the present inventors to solve the above-mentioned problems, the present inventors found that by supporting a deodorizing component consisting of acidic phosphate and a copper compound on a nonwoven fabric,
It was discovered that a deodorizing material with excellent deodorizing efficiency and durability can be easily produced, and based on this knowledge, the present invention was completed. (Means for Improving the Problems) Thus, according to the present invention, there is provided a deodorizing material comprising a nonwoven fabric supporting a deodorizing component consisting of (A) an acidic phosphate and (B) a copper compound. provided. The acidic phosphate as component (A) used in the present invention refers to a phosphate having acidity, and specific examples thereof include dihydrogen phosphate, monohydrogen phosphate, acid pyrophosphate, and acidic metal phosphate. Examples include acid salts. Examples of such salts include sodium, potassium, calcium, aluminum, zinc, and ammonium salts, and among these, water-soluble salts are preferred. These acidic phosphates can be used alone or in combination of two or more. The copper compound as component (B) used in the present invention may be any of inorganic acid salts, organic acid salts, hydroxides, sulfides, complexes, and oxides, and specific examples include copper sulfate, copper nitrate, etc. , cuprous chloride, cupric chloride,
Cuprous bromide, cupric bromide, cuprous iodide, copper carbonate,
Cupric hydroxide, cupric sulfide, copper cyanide, copper acetate, cupric citrate, copper gluconate, copper malate, copper glyoxylate, copper 2-ketoglutarate,
Copper pyruvate, copper oxaloacetate, copper acid phosphate,
Examples include copper pyrophosphate, copper chlorophyll, sodium copper chlorophyllin, potassium copper chlorophyllin, copper phthalocyanine, copper porphyrin, cuprous oxide, cupric oxide, copper oleate, and copper naphthenate. Among these copper compounds, inorganic acid salts are preferred from the viewpoint of cost and availability, and complexes are preferred from the viewpoint of safety. In addition, in the present invention, when the copper compound is acidic copper phosphate, it should be understood that the copper compound and component (A) are included even if component (A) is not separately added. The ratio of component (A) to component (B) in the present invention can be appropriately selected depending on the required performance of the target product, but usually (A)
Component (B) is 0.01 to 200 parts by weight per 100 parts by weight,
Preferably 0.02 to 50 parts by weight, more preferably
It ranges from 0.05 to 20 parts by weight. If the amount of component (B) is too small, the deodorizing performance may be poor, whereas if it is too large, it may be unfavorable in terms of toxicity. In addition, as long as it does not impair the effects of the present invention,
It can be used in combination with other deodorizers, deodorants, bactericides, fungicides, adsorbents, etc., and various additives such as pigments, colorants, stabilizers, antioxidants, etc. can be added as necessary. The type of fibers constituting the nonwoven fabric used in the present invention is not particularly limited, and includes natural fibers,
Any of recycled fibers, synthetic fibers, and semi-synthetic fibers may be used. Specific examples include cellulose fibers such as cotton, hemp, rayon, and pulp, protein fibers such as wool and silk, polyester fibers, polyamide fibers, polyacrylic fibers, poval fibers, polyolefin fibers, Examples include polyurethane fibers and polyvinyl chloride fibers. Inorganic fibers such as glass fibers, metal fibers, carbon fibers, fibrous activated carbon, and asbestos fibers may also be used. Furthermore, the fiber length and fiber diameter of these fibers are not limited. These fibers may be used alone or in combination of two or more types. The nonwoven fabric used in the present invention may be produced by any of dry, wet, or other methods, and is appropriately selected depending on the purpose. The basis weight of the fibers is also not particularly limited. The amount of the deodorizing component supported on the nonwoven fabric in the present invention can be appropriately selected depending on the required performance of the object, but is usually in the range of 0.5 to 500 parts by weight based on 100 parts by weight of the fibers constituting the nonwoven fabric. If the supported amount is too small, the deodorizing performance may be poor, and if the supported amount is too large, the texture of the nonwoven fabric may be impaired and it is not economical. The method of supporting the deodorizing component on the nonwoven fabric is not particularly limited, and includes a method of producing a nonwoven fabric using fibers that have previously supported the deodorizing component as at least some of the fibers constituting the nonwoven fabric; A method of supporting a deodorizing component on the finished nonwoven fabric by spraying or dipping, or
There is a method of melting or dispersing it in a binder emulsion or the like used when producing a nonwoven fabric and supporting it simultaneously with the production of the nonwoven fabric. Further, the order of supporting the deodorizing components (A) and (B) of the present invention may be such that either one is supported and then the other is supported, or both components may be supported simultaneously. Further, when supporting the deodorizing component, it is not necessarily necessary to use a binder, but by using a binder, the amount of the deodorizing component supported can be increased. The type of binder is not particularly limited, but a polymer latex containing a carboxyl group or a sulfonic acid group is suitable. (Effects of the Invention) Thus, according to the present invention, it is possible to obtain a deodorizing material that has superior deodorizing properties and durability of deodorizing performance compared to the prior art. This deodorizing material is useful as a nonwoven fabric for use in filters, masks, diapers, bedding sheets, etc. for the purpose of deodorizing. (Example) The present invention will be described in more detail with reference to Examples below. Note that parts and percentages in Reference Examples, Examples, and Comparative Examples are based on weight unless otherwise specified. Reference Example 1 Viscose rayon fibers with a fiber diameter of 4.5 denier were made into a random web with a basis weight of 100 g/m ² using a wet cloth. After spraying an aqueous solution of 10% solid content prepared from 100 parts of sodium acid pyrophosphate, 1 part of copper sulfate, 200 parts of carboxyl-modified styrene-butadiene latex (manufactured by Nippon Zeon Co., Ltd., LX415A, TS 43%) and water on this web, , drying is repeated to obtain a nonwoven fabric () having the amount of deodorizing component supported as shown in Table 1.
I got (). Reference example 2 Spunbond nonwoven fabric made of polyester fibers with a fiber diameter of 2.5 denier (fabric weight: 50 g/m ² )
, 100 parts of sodium acid pyrophosphate, 1 part of copper sulfate
Styrene-maleic anhydride copolymer (manufactured by Arco Chemical Company,
SMA1000A) 50 parts, carboxyl-modified styrene-butadiene latex (manufactured by Nippon Zeon Co., Ltd.,
It was impregnated with an aqueous solution with a solid content of 10% prepared from 300 parts of LX415A, TS43%) and water. After removing the excess aqueous solution with a squeezing roll so as to obtain a desired basis weight, it was dried to obtain a nonwoven fabric containing 50 g/m ² of a deodorizing component. Reference Example 3 Reference Example 2 except that 5 parts of sodium copper chlorophyllin and 10 parts of powdered activated carbon were used instead of 1 part of copper sulfate and 50 parts of styrene-maleic anhydride copolymer.
A nonwoven fabric containing 50 g/m ² of deodorizing components was obtained in the same manner as above. Reference Example 4 According to the method of Example 2 of JP-A No. 62-33854,
A nylon nonwoven fabric (2) was obtained in which approximately 7% by weight of iron phthalocyanine tetracarboxylic acid was supported. Example 1 Nonwoven fabrics () to () obtained in Reference Examples 1 to 4
After putting 1 g into a 100 ml Erlenmeyer flask filled with air containing 0.7 mg of ammonia and sealing it,
After a period of time, the ammonia concentration in the gas phase was measured by gas chromatography, and the deodorization rate was calculated. The results are shown in Table 1 (first column). Example 2 In order to examine the sustainability of ammonia deodorizing performance, the operation of Example 1 was repeated for the nonwoven fabric used in Example 1 (second time). The same operation was repeated for the obtained nonwoven fabric (third time). The results are also shown in Table 1.

[Table] From Table 1, it can be seen that the deodorizing material of the present invention is excellent in ammonia deodorizing ability and sustainability of deodorizing performance. Example 3 Nonwoven fabrics () to () obtained in Reference Examples 1 to 4
After putting 1 g of each into a 100 ml Erlenmeyer flask filled with air containing 0.02 mg of methyl mercaptan and sealing it, the methyl mercaptan concentration in the gas phase was measured by gas chromatography after 1 hour, and the deodorization rate was calculated. did. The results are shown in Table 2 (first column). Example 4 In order to examine the sustainability of methyl mercaptan deodorizing performance, the operation of Example 3 was repeated (second time) using the nonwoven fabric used in Example 3. The same operation was repeated for the obtained nonwoven fabric (third time).
The results are also shown in Table 2.

【table】

Table 2 shows that the deodorizing material of the present invention is excellent in deodorizing properties of methyl mercaptan and in maintaining deodorizing performance.

Claims (1)

[Claims] 1. A deodorizing material comprising a nonwoven fabric carrying a deodorizing component consisting of (A) an acidic phosphate and (B) a copper compound.