JPH057329B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention uses metal ions having bactericidal action, especially silver,
The present invention relates to a bactericidal zeolite composition comprising solid zeolite particles supporting copper or zinc ions, and a method for producing the same. [Prior Art] It has been known for a long time that silver ions, copper ions, zinc ions, etc. have antibacterial properties. For example, silver ions have been widely used as disinfectants and disinfectants in the form of silver nitrate solutions. However, the solution form is inconvenient in handling and has the drawback of being limited in terms of use. Therefore, if metal ions are retained in a polymer, such drawbacks will be minimized and it can be expected to be used in a wide range of fields. Conventionally, various methods have been proposed for holding metal ions in polymers, such as methods of adhering or adding thin metal wires or powder to polymers, and methods of incorporating metal compounds into polymers. There is. However, the method of using the metal itself has the disadvantage that the specific gravity and Young's modulus of the metal are significantly higher than those of ordinary polymers, so it is poorly compatible with the polymer, and it also requires a relatively large amount, which increases the weight and The cost will be high. On the other hand, methods using metal compounds either have a large effect on the polymer and severely limit the scope of their use, or even if this is not the case, the metal ions are simply contained or attached to the polymer. Because of this, they often fall off during use, causing problems with the sustainability of the sterilizing effect. As a method with fewer such drawbacks, a method has been proposed in which a polymer contains an organic functional group having ion exchange ability or a complex forming ability, and a metal ion is bonded to the organic functional group. However, even in this method, the interaction between the organic functional group and the polymer cannot be ignored, and whether the organic functional group is introduced into the polymer chain or an organic functional group-containing compound is added to the polymer, the interaction between the organic functional group and the polymer cannot be ignored. In order to avoid drastic changes in physical properties, the type of polymer and the type and amount of organic functional groups must be within extremely narrow ranges. 20 zeolites saturated with copper, zinc, silver etc.
Marine paints containing ~30% by weight are known (French Patent No. 1061158). However, although this paint is suitable for exterminating shellfish and algae, it was found that its bactericidal properties were not satisfactory.
This will be explained in detail in Example 4 later. [Problems to be Solved by the Invention] An object of the present invention is to provide a means to maximize the bactericidal properties of bactericidal metal ions and to expand the field of use thereof. In other words, we are developing a method for sterilization that uses a small amount of sterilizing metal ions to stably exhibit excellent sterilizing properties over a long period of time, and that reduces the physical properties of other substances, such as polymers, when mixed with them. The invention provides. [Means for Solving the Problems] The present invention provides zeolite solid particles having a specific surface area of 150 m ² /g or more and a SiO ₂ /Al ₂ O ₃ molar ratio of 14 or less, and an ion exchange capacity of the zeolite solid particles. A germicidal zeolite composition consisting primarily of germicidal metal ions supported by ion exchange on zeolite solid particles in an amount up to about 90%. The present invention also provides a method for producing the above-mentioned bactericidal zeolite composition, which comprises impregnating zeolite solid particles with a bactericidal metal salt in an aqueous solution under conditions that do not precipitate metal compounds. Provided is a method characterized in that zeolite is supported by ion exchange with sterilizing metal ions in an amount of about 90% or less of the ion exchange capacity. In the present invention, the zeolite solid particles supporting bactericidal metal ions (hereinafter sometimes referred to as bactericidal zeolite solid particles for simplicity) are:
A natural or synthetic zeolite made of aluminosilicate supports one or more bactericidal metal ions through ion exchange. Suitable examples of germicidal metal ions include silver, copper and zinc ions. Zeolite is generally an aluminosilicate with a three-dimensionally developed skeleton structure, and is generally xM _2/o O・Al ₂ O ₃・ySiO ₂・based on Al ₂ O ₃
It is expressed as zH ₂ O. M represents an ion-exchangeable metal ion, usually a monovalent to divalent metal, and n corresponds to this valence. On the other hand, x and y represent the coefficients of metal oxide and silica, respectively, and z represents the number of crystal water. Many types of zeolites are known, differing in their composition ratio, pore diameter, specific surface area, etc. However, the specific surface area of the zeolite solid particles used in the present invention is 150 m ² /g or more (based on anhydrous zeolite), and the zeolite constituent SiO ₂ /Al ₂ O ₃
The molar ratio should be 14 or less, preferably 11 or less. A solution of water-soluble salts of silver, copper, and zinc easily undergoes ion exchange with the zeolite defined in the present invention, so utilizing this phenomenon, the necessary metal ions can be added to the zeolite, either singly or in combination. Zeolite particles supporting metal ions can be supported on a stationary phase, but the specific surface area of zeolite particles supporting metal ions is
Two conditions must be met: 150 m ² /g or more and a SiO ₂ /Al ₂ O ₃ molar ratio of 14 or less. It has been found that if this is not the case, the object of achieving effective bactericidal action cannot be obtained. this is,
This is thought to be due to the fact that the absolute amount of metal ions fixed on the zeolite is insufficient to be effective. In other words, this is thought to be due to the physicochemical properties of the zeolite, such as the amount of exchange groups, exchange rate, and accessibility. Therefore, zeolites with a high SiO ₂ /Al ₂ O ₃ molar ratio, known as molecular sieves, are completely unsuitable for the present invention. Furthermore, in zeolite with a SiO ₂ /Al ₂ O ₃ molar ratio of 14 or less, it is possible to uniformly support metal ions that have a bactericidal effect, and for this reason, it is only by using such zeolite that a sufficient bactericidal effect can be achieved. I found out that I can get it. In addition, the acid resistance and alkali resistance of zeolite with a high silica ratio, where the SiO ₂ /Al ₂ O ₃ molar ratio of zeolite exceeds 14, is
The silica content increases as SiO ₂ increases, but its synthesis also takes a long time, and from an economic standpoint, it is not a good idea to use a zeolite with such a high silica ratio. The above-mentioned natural or synthetic zeolite with SiO ₂ /Al ₂ O ₃ ≦14 can be used satisfactorily from the viewpoint of acid resistance and alkali resistance in the fields in which the present composition is usually considered, and is also economically acceptable. It is also cheap and a good idea. From this point of view as well, the SiO ₂ /Al ₂ O ₃ molar ratio must be 14 or less. As the zeolite material having a SiO ₂ /Al ₂ O ₃ molar ratio of 14 or less used in the present invention, either natural or synthetic zeolite can be used. For example, natural zeolite is analcime (Analcime).
_SiO2 / _Al2O3 =3.6 _{~ 5.6} ), Chabazite: _SiO2 / _Al2O3 =3.2~6.0 and 6.4~
7.6), Clinoptilolite:
SiO ₂ /Al ₂ O ₃ = 8.5 to 10.5), Erionite (Erionite: SiO ₂ / Al ₂ O ₃ = 5.8 to 7.4), Faujasite (Faujasite: SiO ₂ / Al ₂ O ₃ = 4.2 to 4.6),
mordenite: SiO ₂ /Al ₂ O ₃ = 8.34
~10.0), Philipsite:
SiO ₂ /Al ₂ O ₃ =2.6 to 4.4), and the like. These typical natural zeolites are suitable for the present invention. On the other hand, typical synthetic zeolites include A-type zeolite (SiO ₂ /Al ₂ O ₃ = 1.4-2.4),
-type zeolite (SiO ₂ /Al ₂ O ₃ = 2-3), Y-
_These synthetic _zeolites are suitable as _{the zeolite} material of the _present invention _. . Particularly preferred are
Synthetic A-type zeolite, X-type zeolite, Y
- type zeolites and synthetic or natural mordenites. The shape of the zeolite is preferably in the form of powder particles, and the particle size may be appropriately selected depending on the application. When the sterilizing zeolite of the present invention is mixed into thick molded bodies, such as various containers, pipes, granules, or thick denier fibers, the particle size should be from several microns to several tens of microns or several hundred microns or more. On the other hand, when forming fine denier fibers or films, it is preferable that the particle size is smaller; for example, in the case of textiles for clothing, it is preferably 5 microns or less, particularly 2 microns or less. Metal ions must be supported on zeolite solid particles by an ion exchange reaction. The ion exchange capacity of zeolite solid particles is less than approximately 90
% or less of metal ions. If metal compounds are simply adsorbed or adhered without ion exchange, or if ions are exchanged beyond saturation, the bactericidal effect and its sustainability will be insufficient. As a method for retaining metal ions, various zeolites defined in the present invention can be used as Ag
- The case of conversion to zeolite will be explained as an example. Normally, a solution of water-soluble silver salt such as silver nitrate is used in Ag-zeolite conversion, but care must be taken not to increase the concentration thereof. For example, when converting A-type _or Through ion exchange, silver ions replace sodium ions in the solid phase and at the same time are precipitated as silver oxides in the zeolite solid phase. This has the disadvantage that the porosity of the zeolite is reduced and the specific surface area is significantly reduced. Furthermore, even if the specific surface area does not decrease significantly, the bactericidal activity decreases due to the presence of silver oxide itself. In order to prevent such excessive silver precipitation into the zeolite phase, it is necessary to maintain the concentration of the silver solution in a more dilute state, for example, below 0.3M AgNO ₃ .
The safest concentration of AgNO ₃ is 0.1M or less. When an AgNO ₃ solution with such a concentration was used, the specific surface area of the Ag-zeolite obtained was almost the same as that of the original zeolite, and the bactericidal effect could be exhibited under optimal conditions. Next, when the zeolite defined in the present invention is converted to Cu-zeolite, a phenomenon similar to that of the above-mentioned Ag-zeolite occurs depending on the concentration of the copper salt used for ion exchange. For example, when converting A-type or X-type zeolite (sodium-type) to Cu-zeolite by ion exchange reaction, 1M
When CuSO ₄ is used, Cu ²⁺ replaces Na ⁺ in the solid phase, but at the same time Cu ₃ (SO ₄ ) is added to the zeolite solid phase.
The porosity of zeolite decreases due to the precipitation of basic precipitates such as (OH ₄ ), which has the disadvantage that the specific surface area decreases significantly. In order to prevent such excessive copper precipitation into the zeolite phase, it is preferable to maintain the concentration of the water-soluble copper solution used in a more dilute state, for example, at 0.05M or less. It has been found that the specific surface area of the Cu-zeolite obtained when using a CuSO ₄ solution of such a concentration is almost the same as that of the original zeolite, which has the advantage that the bactericidal effect can be exhibited in an optimal state. As mentioned above, when converting to Ag-zeolite and Cu-zeolite, solids may precipitate on the zeolite solid phase depending on the concentration of salts used for ion exchange.However, when converting to Zn-zeolite, the salts used This phenomenon is not observed when the distance is around 2 to 3M. Zn usually used in the present invention
- Zeolite can be easily obtained by using salts at concentrations near the above. The above-mentioned Ag-zeolite, Cu-zeolite and
When carrying out the ion exchange reaction for conversion to Zn-zeolite by the batch method, the zeolite material may be immersed in a salt solution having the above-mentioned concentration. In order to increase the metal content in the zeolite material, the number of batch treatments can be increased. On the other hand, when treating a zeolite material by a column method using a salt solution having the above-mentioned concentration, the desired metal-zeolite material can be easily obtained by filling an adsorption tower with the zeolite material and passing the salt solution through it. is obtained. The amount of metal in the above metal-zeolite (based on anhydrous zeolite) is 30% by weight or less for silver, and the preferred range is 0.001 to 5% by weight.
It is in. On the other hand, regarding copper and zinc, the amount of copper or zinc in the metal-zeolite (based on anhydrous zeolite) is 35% by weight or less, and the preferable range is
It lies between 0.01 and 15% by weight. It is also possible to use silver, copper, and zinc ions in combination; in this case, the total amount of metal ions may be 35% by weight or less based on the metal-zeolite (based on anhydrous zeolite), and the preferred range is the amount of metal ions. Although it depends on the composition ratio, it is approximately 0.001 to 15% by weight. Furthermore, even if metal ions other than silver, copper, and zinc, such as sodium, potassium, calcium, or other metal ions, coexist, the bactericidal effect is not hindered, so the residual or coexistence of these ions is not a problem. The bactericidal zeolite composition of the present invention is subjected to a drying treatment, if necessary, before use. The drying conditions may be appropriately selected from the range of 100 to 500°C under normal pressure or reduced pressure. Preferred drying conditions are 100-350°C under reduced pressure. The bonding force between the zeolite defined in the present invention and silver, copper, and zinc ions is extremely large, unlike a method in which the zeolite is held by an adsorbent such as activated carbon or alumina simply by physical adsorption. The strong germicidal ability of articles containing such metal-zeolites, such as polymer moldings, and their long-term persistence are therefore to be noted as particular advantages of the present invention. The zeolite limited as in the present invention has bactericidal properties such as Ag,
It has the advantage of high reactivity with Cu and Zn. For example ^, ion ^- exchangeable metal ions ⁽ Na ⁺ ) in A-type zeolite,
The metal ions are supported in the zeolite matrix by ion exchange with the zeolite. Furthermore, the zeolite defined as in the present invention has the advantage of high selective adsorption for Ag ⁺ , Cu ²⁺ and Zn ²⁺ . This fact shows that even when the polymer composition containing sterilizing zeolite particles of the present invention is used for sterilizing purposes in liquids or water containing various other metal ions, Ag ⁺ , Cu ²⁺ ,
This means that Zn ²⁺ is stably supported in the zeolite matrix for a long period of time and does not elute, which means that the bactericidal activity is maintained for a long period of time. In addition, the zeolite limited as in the present invention is
Ag and Cu have a large exchange capacity and sterilizing power.
It also has the advantage of increasing the amount of Zn ions supported. Also, depending on the purpose of use of the bactericidal zeolite composition of the present invention, it may be supported on zeolite solid particles.
It has the advantage that the amounts of Ag, Cu, and Zn ions can be easily adjusted by ion exchange. Furthermore, when the sterilizing zeolite defined in the present invention is mixed into a polymer, it hardly deteriorates the physical properties of the polymer, and can be mixed into various polymers. Furthermore, the bactericidal zeolite composition of the present invention can be widely applied to antibacterial paints, coating agents, tile joints, and the like. Furthermore, since the bactericidal zeolite composition of the present invention also has the functions inherent to zeolite, it is possible to utilize both antibacterial properties and the functions inherent to zeolite. For example, it is possible to utilize the combined effect of moisture absorption, adsorption and antibacterial effects, which are the main functions of zeolite. Furthermore, it is also possible to coexist with other functional substances to exhibit a combined function of the above effects and other functions. Other functional substances include activated carbon and silica gel. In the case of activated carbon, the deodorizing and adsorption effects are enhanced, and in the case of silica gel, the moisture absorption effect is enhanced. Next, examples of the present invention will be described, but the present invention is not limited to these examples unless the gist thereof is exceeded. In the Examples, the bactericidal effect was evaluated by the following test method. (1) Test method for evaluating bactericidal activity Antibacterial activity was tested using the disk method. That is, the sterilizing zeolite composition was mixed into a polymer to form a molded body, which was cut into disks with a diameter of 20 m/m to provide test disks. Bacteria to be tested include Escherichia coli and Pseudomonas.
aeruginosa, Staphylococcus aureus,
For fungi, Candida albicans was used. For bacteria, use Mueller Hinton medium.
For fungi, Sabouraud medium was used.
The test bacteria were suspended at 10 ⁸ cells/ml in physiological saline and dispersed in the medium using a 0.1 ml Conlage stick. Next, the test disk was pasted onto it. When determining antibacterial activity, in the case of bacteria, the temperature is 37℃.
After culturing for 18 hours, the presence or absence of an inhibition zone was observed.For fungi, the cells were kept at 30°C for one week and the presence or absence of an inhibition zone was observed after culturing. (2) Method for measuring fungal mortality rate Aspergillus flavus spore suspension (10 ⁴ spores/
ml), and the polymer molded body containing the bactericidal zeolite composition was immersed in it and allowed to act at 30°C for 24 hours. Next, it was sampled, diluted, dispersed on Sabouraud agar medium, and kept at 30°C for 24 hours. Next, the number of surviving specimens was measured and the mortality rate was calculated. Example 1 Table 1 shows the natural and synthetic zeolite particles used in the examples of the present invention. Each zeolite was made by crushing and classifying crude raw materials to obtain the desired particle size.
The A-type zeolite in Table 1 is abbreviated as Z ₁ , the X-type zeolite as Z ₂ , the Y-type zeolite as Z ₃ , natural mordenite 1 as Z ₄ , natural mordenite 2 as Z ₅ , and natural chabasite as Z ₆ . The particle diameter, water content, and specific surface area of these zeolites were as shown in Table 1. Next, 250 g of dried fine powder of each type of zeolite listed in Table 1 was collected, and 500 g of a 1/10M silver nitrate aqueous solution was added to each.
ml was added and kept under stirring at room temperature for 3 hours to perform ion exchange. After filtering the silver-zeolite obtained by such ion exchange, it was washed with water to remove excess silver ions. Next, the washed silver-zeolite is dried at 100 to 105℃ and then crushed to produce silver-zeolite.
A fine powder of zeolite was obtained. The silver content, specific surface area, and ratio (%) of the amount of ion-exchanged silver to the ion-exchange capacity of the zeolite (hereinafter referred to as ion-exchange saturation %) of the obtained dried silver-zeolite product are shown in Table 2. show. Below, among the silver-zeolite conversion products, silver-A
Type zeolite is _Z7 , silver-X type zeolite is _Z8 , silver-Y type zeolite is _Z9 , silver-natural mordenite 1
is abbreviated as Z ₁₀ , silver-natural mordenite 2 is abbreviated as Z ₁₁ , and silver-natural chabasite is abbreviated as Z ₁₂ .

【table】

[Table] Example 2 250 g each of dried fine powders of four types of synthetic or natural zeolites, Z ₁ , Z ₃ , Z ₄ and Z ₆ , were collected from the various zeolites shown in Table 1, and 1/20 M of each was collected. 1 of copper sulfate aqueous solution was added. The resulting mixture was kept under stirring at room temperature for 5 hours. The copper-zeolite obtained by such ion exchange was suction filtered and then washed with water until sulfate ions were removed. Next, the washed copper
The zeolite was dried at 100-105°C and then ground to obtain a fine powder of copper-zeolite conversion. The copper content, specific surface area, and ion exchange saturation % of the copper-zeolite conversion product obtained by the above method are shown in Table 2. Among copper-zeolite conversion products, copper-A type zeolite Z ₁₃ and copper-Y type zeolite are
_Z14 , copper-natural mordenite 1 is abbreviated as _Z15 , and copper-natural chabasite is abbreviated as _Z16 . Example 3 Dry powder of A-type zeolite (Z ₁ ) shown in Table 1
250 g was collected, and 2M zinc chloride solution 1 was added thereto, and the resulting mixture was kept at around 60° C. for 3 hours and 20 minutes while stirring. The zinc-zeolite obtained by such ion exchange was separated by centrifugation.
Here, the batch process was repeated four times. The finally obtained converted product was washed with water to remove excess zinc ions. Next, after drying at around 100℃,
It was pulverized to obtain a fine powder of zinc-A type zeolite. In addition, 250 g of dried fine powders of X-type zeolite (Z ₂ ) and natural mordenite 2 (Z ₅ ) shown in Table 1 were collected, and 1/20 M zinc sulfate solution was added to each of them, and the resulting mixture was heated to room temperature. The mixture was kept under stirring for 5 hours to carry out ion exchange. The obtained zinc-zeolite was filtered with suction and then washed with water until sulfate ions disappeared. Next, add water-washed zinc-zeolite to 100-105
It was dried at ℃ and then ground to obtain a fine powder of zinc-zeolite. Table 2 shows the zinc content, specific surface area, and ion exchange saturation % of the three types of zinc-zeolite conversion products obtained by the above method. Among the zinc-zeolite conversion products, zinc-A type zeolite is abbreviated as _Z17 , zinc-X type zeolite as _Z18 , and zinc-natural mordenite 2 as _Z19 .

【table】

[Table] Usage Example 1 Silver-A type zeolite (Z ₇ ), silver-X type zeolite (Z ₈ ), silver-Y type zeolite (Z ₉ ), or silver-natural mordenite 1 ( Z ₁₀ ) was dried at 200° C. for 7 hours under reduced pressure. Then add this to 95%
They were added and mixed to 6 nylon dry chips with a relative viscosity (η _rel ) of 2.3 measured with sulfuric acid to a concentration of 2% by weight, and then melt-spun and stretched according to a conventional method to obtain four types of stretching of 120 denier/4 filaments. Got the thread. Next, the drawn yarn was tube-knitted and refined, and then the bactericidal effect of each yarn was evaluated. Furthermore, in order to examine the durability of the antibacterial activity, the tubular knitted fabric was washed according to JIS L-0217 (method 105), and this was repeated 50 times, after which the antibacterial activity was evaluated. However, for this test, Candida
albicans was used as the test bacterium. Table 3 shows the evaluation results of the antibacterial activity, Table 4 shows the fungal kill rate, and Table 5 shows the evaluation results of the sustainability of the antibacterial activity.

【table】

【table】

[Table] As is clear from Table 3, the bactericidal polymer composition of the present invention has a bactericidal effect against three or more types of test bacteria. Also, as shown in Table 4,
The bactericidal activity against Aspergillus flavus is over 90%. Furthermore, as shown in Table 5, it was confirmed that the antibacterial activity was maintained even after repeated washing 50 times. Comparative Example 1 Dried fine powders of zeolite Z ₁ , Z ₂ , Z ₃ or Z ₄ that do not support silver ions shown in Table 1 were added to nylon in the same manner as in Example 1, mixed and spun to obtain 120%
Four types of drawn yarns each having a denier of 4 filaments were obtained. Next, the antibacterial activity of the drawn yarn tube knitted fabric was evaluated and the fungal killing rate was tested using the same method as in Use Example 1 and using the test bacteria. In both cases, no inhibition zone was formed, and the killing rate was It was 0% and no effect was observed. Use Example 2 Copper-A type zeolite (Z ₁₃ ), copper-Y type zeolite (Z ₁₄ ) or copper-natural mordenite 1 (Z ₁₅ ) shown in Table 2 were dried at 200°C under reduced pressure for 7 hours.
This was then mixed with phenol/tetrachloroethane (6:
4) Intrinsic viscosity measured in mixed solvent [η] 0.640
of polyethylene terephthalate dry chips each
The mixture was added to a concentration of 10% by weight, melted and mixed at 270°C, extruded into guts, cooled and cut to obtain three types of master chips. Next, the master chips and polyethylene terephthalate chips to which no zeolite was added were dried to a moisture content of 0.01%, and then mixed in a ratio of 1:2.
Three types of composite yarns of 50 denier/5 filaments with cross-sectional shapes as shown in FIG. In FIG. 1, A is a polyester component to which sterilizing zeolite has been added, and B is a polyester component to which no sterilizing zeolite has been added. Next, two of the composite yarn and a 50 denier/36 filament drawn yarn of ordinary polyethylene terephthalate containing no bactericidal zeolite were combined, tube-knitted, and refined, and then an evaluation test for antibacterial activity against Esuherichia coli was conducted. As a result, an inhibition zone was formed in all cases, and the bactericidal effect was confirmed. Comparative Example 2 Fine powder dry products of zeolites Z ₁ , Z ₃ and Z ₄ that do not carry copper ions shown in Table 1 were added and mixed to polyethylene terephthalate in the same manner as in Example 2, and then composite spun to obtain 50 denier/ A composite yarn of 5 filaments was obtained. When the antibacterial activity of the composite yarn tube knitted fabric was evaluated in the same manner as in Use Example 2, no inhibition zone was formed and no effect was observed. Comparative Example 3 A-type zeolite (Z ₁ ) fine powder dried product shown in Table 1
250g was taken and 1M aqueous copper sulfate solution was added.
This was kept under stirring at room temperature for 5 hours. The thus obtained copper-A type zeolite was filtered with suction, washed with water until sulfate ions disappeared, and dried at 100 to 105°C.
It was pulverized to obtain finely powdered copper-A type zeolite. The obtained copper-A type zeolite conversion product contains Cu ₃ (SO ₄ )
(OH) ₄ was precipitated and mixed. This copper-A type zeolite conversion product was added to polyester and mixed and composite spun in the same manner as in Example 2 to obtain a composite yarn of 50 denier/5 filaments.
When the antibacterial activity of the composite yarn was evaluated in the same manner as in Use Example 2, no inhibition zone was formed and no effect was observed. Use Example 3 Zinc-A zeolite (Z ₁₇ ) shown in Table 2
Or zinc-X type zeolite (Z ₁₈ ) at 200℃ under reduced pressure.
It was dried for 7 hours. Next, the first component is acrylonitrile, the second component is 10% by weight of methyl acrylate, and the third component is 1% by weight of sodium allylsulfonate.
The bactericidal zeolite was added to a 25 wt% DMF solution of an arylic polymer consisting of 25% by weight of the polymer so that the concentration of each zeolite was 5% by weight relative to the polymer, and the mixture was wet-spun according to a conventional method, stretched, and then cut to form a 3 denier x 51
Two types of acrylic staples of mm were obtained. Next, the staples were spun into a No. 30 single yarn using a conventional method, and then each yarn was knitted in a tube and the bactericidal effect was evaluated by measuring the fungal killing rate. The results are shown in Table 6.

[Table] As is clear from Table 6, the acrylic fiber to which the zinc-zeolite of the present invention was added was found to have a considerable bactericidal effect. Comparative Example 4 A dried fine powder of zeolite Z ₁ or Z ₂ that does not carry zinc ions shown in Table 1 was added to the acrylic polymer and mixed in the same manner as in Example 3, and then spun to form a staple of 3 denier x 51 mm. This was further spun into No. 30 single yarn. When the antibacterial properties of the spun yarn tube knitted fabrics were evaluated in the same manner as in Use Example 3, the killing rate against fungi was 0% in all cases, and no effect was observed. Usage Example 4 Silver-A type zeolite (Z ₇ ), silver-natural mordenite 2 (Z ₁₁ ), silver-natural chabasite (Z ₁₂ ), copper-natural chabasite (Z ₁₆ ), or zinc- Natural mordenite 2 (Z ₁₉ ) at 200℃ under reduced pressure
It was dried for 7 hours. Next, polybutylene terephthalate (hereinafter referred to as
Each metal-zeolite was added and mixed at various concentrations to the dry powder (abbreviated as PBT) and melt-injected at 240°C to form a circular disc with a diameter of 20 mm and a thickness of 3 mm. When the amount added exceeds 50% by weight, the fluidity during melting was poor and the molded product had an uneven appearance. If the amount added is 50% by weight or less, this problem will be less likely.
Furthermore, when the amount added was 40% by weight or less, especially 10% by weight or less, stable physical properties with little variation were obtained. Next, Table 7 shows the results of evaluating the bactericidal effect of the obtained disks based on the fungal killing rate.

[Table] It can be seen that a metal ion concentration of a certain amount or more is required depending on both the metal content of the zeolite and the amount of metal zeolite added. The germicidal zeolite particle-containing polymer composition of the present invention that satisfies the required amounts described in this article has good antibacterial activity. Example 4 This example shows that, contrary to the present invention, when a saturated amount of metal is added to the zeolite that reaches the ion exchange capacity of the zeolite, the bactericidal effect is significantly reduced. Here is a comparative example
(3) was carried out according to Example 1 of French Patent No. 1061158. The zeolite used in the experiment was commercially available mordenite fine powder (SiO ₂ /Al ₂ O ₃ molar ratio = approximately 10).
First, in order to ensure that the type of metal that can be ion-exchanged in this mordenite is sodium, 2M of
The mordenite was pretreated and regenerated with an aqueous NaCl solution and then washed with water to remove excess NaCl. (1) Approximately 2 liters of 0.7M Cu(NO ₃ ) ₂ aqueous solution was added to 1 kg of mordenite under stirring, and then dilute nitric acid was added little by little under continuous stirring to finally adjust the pH of the mixture to 3.1. The mixture was stirred for an additional 5 hours at room temperature to advance the conversion to copper-mordenite.
The copper-mordenite was separated, washed with water to remove excess copper ions, and then dried. Approximately 890 g of dry copper-mordenite was obtained, which is 2.6
% (dry basis) of copper. 2.6% copper is
This corresponds to 41% of the ion exchange capacity of mordenite. (2) Approximately 2 liters of 0.9M Cu (SO ₄ ) aqueous solution was added to 1 kg of mordenite under stirring, and then dilute sulfuric acid was added little by little under continuous stirring to finally adjust the pH of the mixture to 2.9. The mixture was stirred for an additional 3 hours at room temperature to advance the conversion to copper-mordenite.
The copper-mordenite was separated, an additional 1.5 liters of 0.9M _CuSO4 aqueous solution was added, and the above procedure was repeated. The copper-mordenite obtained from this double treatment was separated, washed with water to remove excess copper ions, and then dried. Approximately 930 g of dry copper-mordenite was obtained, which is 4.5% (dry basis)
Contains copper. 4.5% copper corresponds to 71% of the ion exchange capacity of this mordenite. (3) Comparative example 2M CuSO ₄ aqueous solution approx. 250 g to 100 g of mordenite
ml and stirred for 4 hours. The mordenite was separated, about 250 ml of 2M _CuSO4 aqueous solution was added and the above procedure was repeated. Wash the obtained copper-mordenite with water,
After drying, it contained 6.3% (dry basis) copper. 6.3% copper is approximately equal to the ion exchange capacity of this mordenite. The three types of copper-mordenite and non-copper-supported mordenite obtained above were tested for antibacterial activity according to the disk method described above. However, here, copper-mordenite particles were sprinkled on the medium instead of disks. The results are shown in Table 8.

[Table] + = Formation of inhibition zone - = No formation of inhibition zone From the above, it can be seen that the zeolite composition that carries bactericidal metal ions through ion exchange in an amount less than the ion exchange capacity carries the metal in an ion exchange saturation amount. It is clear that it has significantly superior bactericidal properties compared to the case of supported zeolite.

[Brief explanation of the drawing]

FIG. 1 shows an example of the cross-sectional shape of a spun-drawn polymer composition.

Claims (1)

[Claims] 1 Specific surface area of 150 m ² /g or more and 14 or less
consisting primarily of zeolite solid particles having a molar ratio of SiO ₂ /Al ₂ O ₃ , and bactericidal metal ions supported by ion exchange on the zeolite solid particles in an amount of about 90% or less of the ion exchange capacity of the zeolite solid particles. Germicidal zeolite composition. 2 Zeolite solid particles are A-type zeolite,
2. The fungicidal polymer composition according to claim 1, which is comprised of Y-type zeolite, Y-type zeolite, or mordenite. 3. The germicidal zeolite composition according to claim 1, wherein the germicidal metal ions are selected from the group consisting of silver ions, copper ions, and zinc ions. 4. In the method for producing a bactericidal zeolite composition according to claim 1, the zeolite solid particles are impregnated with an aqueous solution of a bactericidal metal salt under conditions in which metal compounds do not precipitate. A method characterized by causing zeolite to support bactericidal metal ions in an amount of about 90% or less of the ion exchange capacity of zeolite by ion exchange.