JP3127552B2 - Antibacterial resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an antibacterial resin.

[0002]

2. Description of the Related Art In recent years, most household products are made of resin, but most resins are habitats of microorganisms, and there is a demand for improved cleanliness.

[0003]

Accordingly, many antibacterial agents have been proposed, and their safety to the human body and the environment has been discussed.

[0004] Microbial contamination on the resin surface starts when the microorganisms come into contact with water containing nutrients on the resin, and further adheres dust and the like, eventually leading to the generation of slime and the growth of fungi. Therefore, there is a demand for an antibacterial resin that prevents the above-described series of microbial contamination, is highly safe for the human body, and hardly leads to environmental pollution.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an antibacterial resin having antibacterial means which is less polluting the environment and is safe for the human body.

[0006]

According to the present invention, in order to achieve the above object, an antibacterial agent and a water repellent are added to a resin.

As an antibacterial agent, a thiosulfatosilver complex salt supported on silica gel and at least a part of its surface is coated with a hydrolyzate of tetraalkoxysilane is used.

Further, the water repellent is a tetrafluorinated resin or a compound having a trifluorinated carbon structure at least at either a side chain or a main chain terminal.

The water repellent has a melting point equal to or lower than the molding temperature of the resin to be added.

[0010]

According to the present invention, when the antibacterial resin is immersed in water or a large amount of water is dropped on the surface, the antibacterial component exudes from the resin and exerts a sterilizing effect. Microorganisms in the water come into contact with silver compounds, which are antibacterial components on the antibacterial resin surface, and exhibit a bactericidal effect.

However, when a small amount of water is dropped on the surface of the resin or when the surface of the resin is wet, the water repellent acts to reduce the contact area of the surface of the resin with water. Generally, when comparing the state of floating microorganisms in water and the state of adhesion to vessel walls, the latter is said to have a higher growth rate. Thus, when water droplets adhere to the resin surface, the area of contact with the resin surface is reduced, and the water droplets are also less likely to adhere, thereby suppressing the growth of microorganisms on the resin surface. According to the present invention, an antibacterial agent having an antibacterial effect by contacting microorganisms on the resin surface based on the above principle and a water repellent having an effect of increasing the contact angle of the resin surface and suppressing the growth of microorganisms are added and mixed. By doing so, the resin is given antibacterial properties.

The function of the water repellent agent, which originally makes it difficult to adhere the contaminants to the resin surface, is exerted as it is, and the adhesion of organic substances, which are nutrient sources of microorganisms, is suppressed.

Further, even if the resin surface is polished during continuous use, if a new resin surface comes to the surface, a new water repellent and an antibacterial agent are also present there, so that the antibacterial performance is hardly reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

(Example 1) FIG. 1 is a sectional view of the antibacterial resin. 1 is a polypropylene main resin, 2 is a silver silica gel antibacterial agent particle, 3 is a water repellent made of tetrafluorinated resin powder having an average particle diameter of about 15 μm, which is kneaded and added at the time of molding the resin 1.

Next, the silver silica gel-based antibacterial agent particles 2 will be described together with the production method. 100 parts by weight of a water-soluble silver salt such as silver acetate is added to and dissolved in water containing no chlorine, and a mixture of sodium sulfite and sodium hydrogen sulfite 4
50 parts by weight, and a water-soluble salt of sodium thiosulfate 30
0 parts by weight were sequentially mixed and dissolved with sufficient stirring to obtain an aqueous solution of a silver complex salt. The weight of sodium thiosulfate is indicated as the weight of the hydrate _{Na 2 S 2 O 3 · 5H} 2 O.

The carrier used in the silver silica gel antibacterial agent particles of this embodiment is a B-type silica gel powder described in "JIS Z 0701 Silica gel desiccant for packaging". The B-type silica gel powder has a low moisture absorption rate at low humidity, a high moisture absorption rate at high humidity, and a high total moisture absorption at high humidity, and has an average particle size of about 8 μm.

The silica gel powder was dried at 180 ° C. for 2 hours or more. The silver thiosulfato solution was mixed with 100 parts by weight of the above silica gel so that the silver component was 2 parts by weight. Next, the water absorbed in the solvent and the carrier was promptly removed. Next, this was pulverized to a predetermined particle size to obtain silica gel carrying an antibacterial material.

As a coating material, 100 parts by weight of the above silica gel is dispersed in a solution obtained by diluting 100 parts by weight of tetraethoxysilane with 100 parts by weight of ethyl alcohol, and 20 parts by weight of pure water is added thereto. Was hydrolyzed to coat at least a part of the surface of the silica gel. Next, this was dried to obtain silver silica gel-based antibacterial agent particles 5.

3% of the silver silica gel antibacterial agent particles 5
A mixture of 1% calcium stearate, 3% titanium oxide, and 1% colored cut rayon in a polypropylene resin was mixed and processed into a resin molded product at a molding temperature of about 210 ° C.

The number of bacteria on the surface of the resin molded product is shown in Table 1 for this example and the conventional product. From these results, the antibacterial resin of the present invention exhibits antibacterial properties on the surface and maintains cleanliness.

[0022]

[Table 1]

(Example 2) FIG. 2 is a sectional view of the antibacterial resin. Reference numeral 4 denotes an ABS main resin, 5 denotes silver silica gel antibacterial particles, and 9 denotes a water repellent comprising an oil having a trifluoride structure at a main chain terminal, which is kneaded and added at the time of molding the resin 4.

A mixture of 3% silver silica gel antibacterial agent particles 5, 0.5% water repellent 6, and 3% titanium oxide is called AB
It is added to the S resin 4 and kneaded. When this is molded at 240 ° C., the water repellent has a high melting point lower than the resin molding temperature and therefore has a high fluidity during resin molding, and has a lower polarity than the resin. Improves the water repellency of the molded product surface.

The antibacterial performance of the antibacterial resin of this example manufactured in such a configuration was evaluated in the same manner as in Example 1. As a result, the antibacterial property was exhibited on the resin surface and the effect of maintaining cleanliness was obtained. Obtained.

[0026]

As is apparent from the above description, according to the present invention, the contact angle between the antibacterial agent having an antibacterial effect and the resin surface is increased by contacting the resin surface with the microorganism to suppress the adhesion and proliferation of the microorganism. By using an effective water repellent in combination, the antibacterial effect that is safer for the human body and has less environmental pollution is obtained by utilizing the characteristics at the time of microbial growth.

Further, even if the resin surface is polished during continuous use, if a new resin surface comes to the surface, a new water repellent and an antibacterial agent are also present there, so that the antibacterial performance is hardly reduced. It can provide an antibacterial resin having the same.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an antibacterial resin according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an antimicrobial resin according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body resin 2 Silver silica gel antibacterial agent particle 3 Tetrafluorinated resin powder water repellent 4 Body resin 5 Silver silica gel antibacterial particle 6 Water repellent

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Atsushi Nishino 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-2-292201 (JP, A) JP-A-1- 287172 (JP, A) JP-A-5-201817 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08L 1/00-101/16 C08K 3/00-13/08 A01N 59/16

Claims (5)

(57) [Claims] 1. An antimicrobial resin composition comprising an antimicrobial agent and a water repellent added to a resin. 2. The antibacterial resin composition according to claim 1, wherein the antibacterial agent is a silica gel on which a silver thiosulfato complex salt is supported and at least a part of the surface of which is coated with a hydrolyzate of tetraalkoxysilane. Thing . 3. The antibacterial resin composition according to claim 1, wherein the water repellent is a tetrafluorinated resin. 4. The antibacterial resin composition according to claim 1, wherein the water repellent is a compound having a trifluorinated carbon structure at least in either a side chain or a main chain terminal. 5. The antimicrobial resin composition according to claim 1, wherein the water repellent has a melting point equal to or lower than the molding temperature of the resin to be added .