JPH0554871B2 - - Google Patents

Description

[Detailed description of the invention]

(Field of industrial application) This invention relates to super absorbent resins that have been used in disposable diapers, sanitary napkins, etc. in recent years. In contrast to the above-mentioned super absorbent resins that have high water absorption and water retention abilities and are used in various fields,
Furthermore, the present invention relates to a super absorbent resin composition that has added antibacterial and deodorizing properties. (Prior Art and its Problems) Disposable diapers and sanitary napkins that have strong water absorption ability, little return, small volume, and good water retention performance are welcome. On the other hand, in recent years products using super absorbent resins have appeared and are popular with users. However, in the case of disposable diapers, for example, they have a water-retaining ability that can withstand use for 7 to 8 hours with one change. Bacterial growth and odor from excrement and other materials retained for a long period of time become a problem, reducing the advantages of resin from a hygienic point of view. Also 3
When garbage is stored for up to four days, odor is generated along with garbage juice, and the situation can be called a pollution during the summer. Therefore, the present invention aims to impart antibacterial and deodorizing properties at a low cost to such highly water-absorbent resins which have water absorption and water retention abilities but are poor in antibacterial and deodorizing properties. (Means for Solving the Problems) The present invention provides a combination of powder, granules, and lumps of water-soluble glass containing monovalent Ag in its composition, and a superabsorbent resin carrier. and moisture absorbed by the carrier, and the glass solid is brought into contact with and dissolved in the moisture, while Ag ⁺ ions are eluted and impregnated and carried within the carrier. The present invention relates to a super absorbent resin composition comprising: The superabsorbent resin used as a carrier in the present invention is generally a polymer compound that can absorb water tens to thousands of times its own weight, and absorbs water and gels to become gelatinous. These resins are classified into starch-based, cellulose-based, and synthetic polymer-based resins based on their constituent components, and are divided into powder, film, and fibrous forms in terms of product form. One example is a sodium polyacrylate crosslinked product made from acrylic acid produced by gas phase oxidation of propylene. On the other hand, water-soluble glass solids containing monovalent Ag are
One or more network forming oxides of SiO ₂ , B ₂ O ₃ , P ₂ O ₅ and Na ₂ O, K ₂ O, CaO, MgO,
It consists of a glass composition containing one or more network modifying oxides of BaO and ZnO and one or more network intermediate oxides of Al ₂ O ₃ and TiO ₂ , and 100 parts by weight of this solid matter. It contains, for example, 0.1 to 2.5 parts by weight of Ag ₂ O as monovalent Ag. The above-mentioned water-soluble glass allows the dissolution rate of the solid substance in water to be controlled by the composition ratio of the above-mentioned intermediate oxide through a gelation phenomenon in water,
As a result, Ag ⁺ ions are retained in the gel-like material at a constant rate over time, and are gradually eluted into the water. Water-soluble glass (hereinafter referred to as silver glass) containing these super-absorbent resin carriers and monovalent Ag becomes a super-absorbent resin composition in which water eluted from the silver glass is held in the resin. Because it is silver glass, the moisture absorbed by the resin has the ability to kill bacteria ^.
This makes it possible for ions to gradually elute in a constant amount over time. (Action) The monovalent silver ions Ag ⁺ in the glass are mixed and supported in a super absorbent resin carrier, and the liquid absorbed by the carrier melts the glass, which acts directly on the cells of organisms present in the liquid insect. It kills bacteria, and along with this high bactericidal power, it also exhibits deodorizing power by inhibiting the growth of fungi that produce bad odors.In this case, the silver glass supported on the resin carrier is dissolved. When the liquid temperature is higher than when it is low, the PH
However, the solubility is higher in alkaline conditions than in acidic conditions, and the antibacterial effect is greater. The elution time and duration of the silver ion Ag ⁺ differ depending on the shape of the water-soluble glass used, such as powder, granule, or block. Powdered materials that have a large contact area with aqueous solutions are suitable for applications that retain water in a certain place, such as disposable diapers and napkins, while lumpy materials that can gradually elute Ag ⁺ ions and maintain antibacterial activity for a long time are suitable for garbage. Suitable for storage etc. [Antibacterial and deodorizing power test] (1) Sample (A) Water-soluble silver glass SiO ₂ 40.0 mol%, B ₂ O ₃ 50.0 mol%,
2 parts by weight of monovalent Ag (calculated as Ag ₂ O) was added to 100 parts by weight of a mixture of 10.0 mol% Na ₂ O, mixed uniformly, and melted in a glass melting furnace.
After melting at a temperature in the range of 1100-1300℃ for 60 minutes, the resulting powder is quenched and pulverized to pass 200 meshes. For example, a product manufactured by Kinki Pipe Giken Co., Ltd. with a product name equivalent to Biosure SG. (B) Super absorbent resin support A crosslinked sodium polyacrylate made from acrylic acid produced by gas-phase oxidation of propylene. Powder with particle size 150-300 microns. For example, manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd., product name,
Aquaric CA equivalent product. (2-1) Antibacterial activity test After adding sample (A) to sample (B) in the amount shown in Table-1, it was swollen by absorbing physiological saline and used as a sample. AATCC Test Method
90-1982 (halo test). ◎ Bacteria used in the test and their culture (a) Test strain Staphylococcus aureus IFO 12732 (Staphylococcus aureus) Escherichia coli IFO 3301 (E. coli)
Pseudomonas aeruginosa IFO 13275 (Aeruginosa) (a) Preparation of agar plate culture Each of the above bacterial strains was grown in AATCC broth medium ^*1 at 37%
Cultured at ℃ for 24 hours. AATCC this culture solution
0.5% (V/V) was added to agar medium ^*2 , and 10 ml was dispensed into a shear dish (φ90 mm) and solidified. *1 AATCC bouillon medium peptone 1%, meat extract 0.5%, salt 0.5
%, mm ² 6.8 *2 AATCC agar medium AATCC bouillon medium + agar 1.5% (c) Test procedure Add silver glass powder (sample A) to 100 parts by weight of super absorbent resin carrier (sample B). 1.5
Alternatively, after adding 10 parts by weight, 100 ml of sterile physiological saline was absorbed into 2.5 g of resin to form a gel, and a sample was prepared. A certain amount of these samples was placed on the previously prepared agar plate medium by pressing lightly, and after culturing at 37°C for 24 hours, the presence or absence of a growth inhibition zone around the samples was observed. In addition, a similar test was conducted using only the superabsorbent resin (without the addition of sample A), which was used as a control. (2-2) Antibacterial activity test results The results are shown in Table 1 (see attached Figures 1 to 12) In Table 1, the growth inhibition zone is:
After culturing the sample under certain conditions, its antibacterial properties prevent the growth of bacteria in the culture medium.
A sterile ring forms on the medium. This is called the growth inhibition zone. As shown in Table 1, it was found that the superabsorbent resin-supported material to which 1 part by weight or more of silver glass powder was added had considerable antibacterial activity against three types of bacteria.

[Table] (3-1) Deodorizing power test Each sample was tested using 50g of human urine, which was mixed with 2g of sample (B) and deodorant in the amounts shown in the table.

〔Test results〕

The above antibacterial activity and deodorization tests revealed that 100 parts by weight of a superabsorbent resin carrier mixed with about 1.0 parts by weight or more of silver glass had sufficient antibacterial activity against Escherichia coli, Aeruginosa, and Staphylococcus aureus. It was found to have deodorizing properties. In order to further strengthen the deodorizing power, it is desirable to use activated carbon in combination. (Example) An example will be described of a paper diaper that is currently most widely used and uses the antibacterial, deodorizing, and super absorbent resin of the present invention, which was found in the above antibacterial and deodorizing power tests. 1 part by weight of the silver glass powder (200 mesh) used as sample A was mixed and supported on polyacrylic diameter super absorbent resin used as sample B as the inner material of disposable diapers, and formed into a film by a normal manufacturing method. It was made into a water-absorbing sheet. This water-absorbing sheet was used as the main material to form a commonly used three-layered diaper with a large number of chicks attached, and the outer layer was further covered with a polyethylene film in consideration of waterproof properties to make a paper diaper. When this product was placed on a person who had traditionally used disposable diapers, and the results after 8 hours were examined, the odor was reduced compared to the conventional product, and there was no occurrence of ``diaper rash.'' As a result, antibacterial and deodorizing effects were confirmed, although not quantitatively. (Effects of the Invention) As described above, the super-absorbent resin composition of the present invention supports a mixture of water-soluble glass containing monovalent Ag in the resin body, so that the absorbed water of the super-absorbent carrier is Monovalent silver ions in silver glass depending on the liquid content
Ag ⁺ is eluted, and this silver ion Ag ⁺ can kill bacteria and prevent the growth of putrefactive fungi that produce bad odors, so it has a bactericidal and deodorizing effect, increasing the suitability of super absorbent resin. It is also useful for expanding its uses. Furthermore, since monovalent silver ions are supported on the resin by mixing water-soluble glass powder, granules, and aggregates, it is easy to handle and store, and it is safe and inexpensive to manufacture. It is possible.

[Brief explanation of drawings]

Figures 1 to 12 show the test results of the antibacterial activity test of the super absorbent resin composition of the present invention. Add the following amount of product A) and use it as a sample,
These samples were placed on an agar plate medium in which the following bacterial strains were cultured, and the presence or absence of an inhibition zone around the samples was observed. Of these, Figures 1 to 4 are planes showing the conditions of the growth inhibition zone when the amount of sample A added was 0, 1, 5, and 10% by weight, respectively, when targeting Staphylococcus aureus. It is a diagram. FIGS. 5 to 8 are plan views respectively showing cases in which the amount of sample A added is the same as described above for E. coli. FIG. 9 to FIG. 12 are plan views respectively showing cases of similar test products targeting Pseudomonas aeruginosa. (Explanation of symbols, 1... Sample, 2... Plate medium,
3... Growth inhibition zone, 4... 90mmΦ shear.

Claims (1)

[Claims] 1 Consists of any one or a mixture of water-soluble glass powder, granules, and lumps containing monovalent Ag in the composition, a superabsorbent resin carrier, and water absorbed by this carrier, A super absorbent resin composition having antibacterial and deodorizing functions, characterized in that Ag ⁺ ions are eluted while contacting and dissolving the glass solid in the water, and are impregnated and carried in the support.