JPH09291243A - Antibacterial ink for printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject ink capable of imparting an antibacterial property capable of preventing the growth of bacteria by a printing treatment of articles such as the paper of papered sliding doors by kneading a main ink with a specific particulate material. SOLUTION: This antibacterial ink is obtained by kneading a main ink with the particles of water-soluble glass containing a monovalent silver compound in the composition. The ink is printed on a substrate comprising a synthetic resin, etc., and subsequently brought into contact with water or steam. Thereby, the water-soluble glass is dissolved to release silver cations. The water-soluble glass is produced e.g. by homogeneously mixing 100 pts.wt of a mixture comprising 40.0mol% of SiO2 , 50.0mol% of B2 O3 and 10.0mol% of Na2 O with a monovalent silver compound in an amount of 2.0 pts.wt. (converted into Ag2 O), melting the mixture at 1100-1300 deg.C for 60min, quenching the mixture and subsequently selecting 200 mesh particles from the crushed product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial ink for printing which, after being printed, is contacted with water or water vapor to elute positive Ag ions to generate antibacterial properties.

[0002]

2. Description of the Related Art Conventionally, wallpaper, bran paper, and tatami backing paper, when placed in a humid place, cause bacteria to odor, corrode,
There was a deterioration in aesthetics.

[0003]

The problem to be solved by the present invention is to provide an antibacterial ink for printing which imparts antibacterial properties to these articles so that bacteria do not grow by printing.

[0004]

Means for Solving the Problems, Actions and Effects The antibacterial ink for printing of the present invention is mainly composed of a water-soluble glass powder or granule containing monovalent Ag in its composition as a means for solving the above problems. It is made by kneading into ink, and after being printed on a substrate such as paper, cloth, synthetic resin, etc., it is made to elute positive Ag ions while dissolving the water-soluble glass by contact with water or steam. Therefore, the water-soluble glass containing monovalent Ag used in the present invention is disclosed in JP-B-5-5.
SiO ₂ 55-80, which is the same as that used for the “water-soluble glass water treatment agent” disclosed in Japanese Patent No. 3733.
% (Weight: the same below), Na ₂ O 19.5 to 42%
And Ag ₂ O (calculated) of 0.5 to 3%, or 0.5 to 30% of Al ₂ O ₃ is further contained in this composition.

[0005] SiO ₂ is a network-forming oxide, produce bactericidal action eluted positive Ag ions from the water adheres with its network structure unit Ag ₂ O, Na ₂ O
It is intended to guarantee the water-soluble role and glass incorporating Ag ₂ O at a network modifying oxide in the glass, also, Al ₂
O ₃ has a function of incorporating a large amount of Ag ₂ O into the glass network structure and serves to mitigate the deliquescent property of the glass.

When water or water vapor adheres to the ink in which the water-soluble glass is kneaded, positive Ag ions effective for antibacterial properties are gradually eluted from the water-soluble glass to exert antibacterial properties.

[0007]

Embodiments of the present invention will be described below.

First, the water-soluble glass containing monovalent Ag used in this example was SiO ₂ 40.0 mol%, B ₂ O.
_{3 To} 100 parts by weight of a mixture of 50.0 mol% and Na ₂ O 10.0 mol%, 2.0 parts by weight of monovalent Ag in terms of Ag ₂ O was added, and the mixture was uniformly mixed to obtain a glass. It is a powder of 200-mesh passage obtained by crushing a product prepared by melting in a melting furnace at a temperature in the range of 1100 to 1300 ° C. for 60 minutes and then rapidly cooling.

This is, for example, manufactured by Kinki Pipe Giken Co., Ltd.
Product name, biosure SG equivalent product.

The above water-soluble glass powder is mixed in commercially available water-based and solvent-type printing inks at different ratios, and the water-based main ink is mixed in paper and solvent-based main ink. Those mixed in the above were subjected to the antifungal test as follows using vinyl as silk screen-printed test pieces.

1 test piece

[Table 1] 2 Antifungal test (1) Test fungus Aspergillus sp. (2) Preparation of mold spore suspension A fungal strain of the above (1) sufficiently formed in PDA medium was added to a sterilized 0.005% sodium dioctyl sulfosuccinate solution and suspended to obtain a spore count. About 10 ⁶
The spore suspension was prepared by adding the inorganic salt medium (Table 2) so that the number of the spores was 1 / ml.

[Table 2] (3) Test operation The test piece was placed on an inorganic salt agar medium (the medium in Table 2 was added with 1.5% agar and solidified to form a plate), and the above (2) was used.
The spore suspension prepared in 1. was evenly sprayed onto the test piece and the medium and cultured at 28 ° C. and 90% RH or higher for 7 days.

[Table 3] 3 Mold growth on the surface of test pieces

[Table 4] 4 Summary Regarding the test pieces 1-B, 1-C, and 1-D, mold growth was not observed on the test pieces, and halo formation was recognized. In the test piece 1-A, mold grew on the entire surface of the test piece.
(-> No mold proof) Specimens 2-C and 2-D showed good mold proof.
(Especially, the test piece D is not recognized for mold growth) The test piece 2-B is inferior to the test pieces 2-C and 2-D in antifungal performance. In the test piece 2-A, mold grew on the entire surface of the test piece.
(→ No antifungal property) From the above test results, the antibacterial property of the antibacterial ink for printing of the present invention was confirmed. The present invention can also be applied to other printing inks such as gravure printing inks and offset printing inks. When food packaging paper is printed with the ink of the present invention, food corrosion can be suppressed.

Claims (1)

[Claims] 1. A paper, a cloth, which is obtained by kneading a powdery granular material of water-soluble glass containing monovalent Ag in its composition into a main ink.
An antibacterial ink for printing, which is printed on a base material such as a synthetic resin and then dissolved in the water-soluble glass by contact with water or steam to elute positive Ag ions.