JPH05201817A - Antimicrobial resin - Google Patents

Abstract

PURPOSE:To obtain an antimicrobial resin having antimicrobial performances and slight change of color of resin caused by coloring of an antimicrobial agent resulting from browning of an antimicrobial material by heating during molding, browning of the antimicrobial material by exposure to ultraviolet rays and browning of the antimicrobial material by a chlorine-based chemical such as chlorine-detergent. CONSTITUTION:A thermoplastic resin is blended with an antimicrobial agent obtained by supporting a thiosulfato silver complex on silica get and coating part of the surface of the silica gel with an alkoxysilane hydrolyzate and at least one or more selected from an aliphatic acid selected from stearic acid and lauric acid, a metallic soup such as calcium salt, zinc salt or aluminum salt of stearic acid or lauric acid, a fatty acid amide derivative and a glycidyl methacrylate-based polymer.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an antibacterial resin, and more particularly to an antibacterial resin containing a silver antibacterial agent.

[0002]

2. Description of the Related Art In recent years, when synthetic resin products have been heavily used, and when they are used in fields in which hygiene needs to be paid attention, such as kitchen appliances, contamination of the surface of the synthetic resin by bacteria is a problem. Is becoming. As a countermeasure against this, a method is used in which an antibacterial composition is mixed in a synthetic resin and the composition is eluted on the surface of the synthetic resin to sterilize the resin surface.

[0003]

However, when an antibacterial agent is kneaded in a synthetic resin, particularly in the case of an antibacterial agent in which an antibacterial material is supported on an inorganic carrier, the secondary particles are decomposed into the resin. The important issues are the homogeneous dispersion of the above and the method of controlling the amount of the antibacterial material diffused in the resin or the amount eluted from the resin surface.

Further, when the antibacterial material is a silver-based material, the antibacterial material is colored brown by heating during molding, the antibacterial material is colored brown by exposure to ultraviolet rays, and the antibacterial material is colored brown by chlorine-based chemicals such as chlorine detergent. The discoloration of the resin due to the coloration of the antibacterial agent caused by the problem has become a problem.

In view of the above problems, it is an object of the present invention to provide an antibacterial resin which exhibits a stable antibacterial effect on the surface of the resin and does not impair the appearance characteristics of the resin.

[0006]

The present invention is directed to an antibacterial agent obtained by supporting a thiosulfato silver complex salt on a silica gel on a thermoplastic resin and coating a part of the surface thereof with a hydrolyzate of an alkoxysilane, a fatty acid, An antibacterial resin characterized by kneading at least one additive aid selected from fatty acid amide derivatives, metal soaps, and glycidyl methacrylate-based polymers. Further, the fatty acid is characterized by being at least one fatty acid selected from stearic acid and lauric acid. further,
The metal soap is characterized in that it is at least one metal soap selected from salt compounds of calcium salt, zinc salt, and aluminum salt of stearic acid or lauric acid.

[0007]

As described above, according to the present invention, an antibacterial resin having a stable antibacterial effect can be obtained. Also, by uniformly dispersing the antibacterial agent in the resin and controlling the amount of the antibacterial material diffusing into the resin or elution from the resin surface, the antibacterial resin's discoloration resistance is improved by heating during molding, exposure to ultraviolet rays, and chlorine-based chemicals. To do.

That is, since the additive aid acts as a surfactant in the resin, it has the function of uniformly dispersing the antibacterial agent containing the silver thiosulfato complex salt in the resin, and the antibacterial agent component adsorbed around the antibacterial agent causes It has the function of controlling the rate of leaching in and elution from the resin surface. Therefore, a stable antibacterial property and discoloration resistance can be obtained by uniformly dispersing the antibacterial agent in the resin or on the surface of the resin and controlling the elution amount by the combination of the antibacterial agent and the additive aid.

[0009]

EXAMPLES The present invention will be described in detail below with reference to examples.
First, a method for producing the antibacterial agent used in the present invention will be described. 100 parts by weight of a water-soluble silver salt such as silver acetate, 450 parts by weight of a mixture of sodium sulfite and sodium bisulfite, and 300 parts by weight of a water-soluble salt of sodium thiosulfate were added to chlorine-free water to dissolve and sufficiently stirred. While mixing, an aqueous silver complex salt solution was obtained.

The carrier for antibacterial agents used in this example is "JI
B described in "S Z 0701 Silica gel desiccant for packaging"
Type silica gel powder. This B-type silica gel powder is a silica gel powder having a low moisture absorption rate at low humidity, a high moisture absorption rate at high humidity, and a high total moisture absorption amount at high humidity, and its average particle size is about 8 μm.

The silica gel powder was dried at 180 ° C. for 2 hours or more. The thiosulfato silver complex salt aqueous solution was mixed with 100 parts by weight of the silica gel so that the silver component was 2 parts by weight. Then, the water absorbed in the solvent and the carrier was promptly removed. Then, this was pulverized to a predetermined particle size to obtain silica gel carrying an antibacterial material. After 100 parts by weight of the silica gel was dispersed in a solution prepared by diluting 100 parts by weight of tetraethoxysilane as a reactive organosilicon compound in ethyl alcohol, pure water was added to this to hydrolyze the tetraethoxysilane. At least part of the surface of the silica gel was coated. Then, this was dried to obtain a silver silica gel antibacterial agent.

Example 1 Toned ABS resin 100
3 parts by weight of the silver-silica gel type antibacterial agent, 3 parts by weight of calcium stearate and 1 part by weight of stearic acid are mixed with parts by weight, kneaded and then pelletized to prepare antibacterial resin pellets.

The above antibacterial resin pellet is molded at about 240 ° C. to obtain an antibacterial resin. An antibacterial test was conducted on this antibacterial resin by the following method. The results are shown in Table 1.

Antibacterial test: Escherichia coli, Staphyloco
The halo test method was applied using ccus aureus and Bacillus subtillis. The evaluation was carried out after 7 days.

As for the antibacterial resin, a resin to which an antibacterial agent was not added and a conventional silver antibacterial agent were compared with an antibacterial resin produced by a method not according to the method of the present invention, and the result of a discoloration test by heating during molding was conducted. Table 2 shows the results of the discoloration test by exposure to ultraviolet rays and the results of the discoloration test by immersion in a chlorine-based detergent.

Regarding the heat discoloration during molding, 24
Change of resin surface color after molding at 0 ° C, change of resin surface color after exposure to sunshine weatherometer 2000 hours for UV exposure test, 100 hours of sodium hypochlorite 5% aqueous solution for chlorine detergent immersion test The results of the color change of the resin surface after immersion are shown in Table 2. It can be seen from Table 1 that the antibacterial resin of this example has a practical antibacterial performance. From Table 2, it can be seen that the antibacterial resin of this example has practical discoloration resistance.

[0017]

[Table 1]

[0018]

[Table 2]

(Example 2) ABS resin 100 toned
3 parts by weight of the above-mentioned silver silica gel type antibacterial agent, 3 parts by weight of calcium stearate, and fatty acid amide derivative (manufactured by Harima Kasei Co., Ltd., trade name "Vanlube N-18F").
1 part by weight and 1 part by weight of a glycidyl methacrylate polymer (manufactured by NOF CORPORATION, trade name "Blenmer CP") are mixed, kneaded and then pelletized to prepare an antibacterial resin pellet.

The above antibacterial resin pellet is molded at about 240 ° C. to obtain an antibacterial resin. An antibacterial test was conducted on this antibacterial resin in the same manner as in Example 1. The results show that it has a practical antibacterial performance as in Example 1.

In addition, the antibacterial resin was compared with a resin to which no antibacterial agent was added and a conventional antibacterial resin to which a silver antibacterial agent was added, and as a result of a discoloration test by heating during molding, a discoloration test by exposure to ultraviolet rays. As a result, the discoloration test result by immersion in a chlorine-based detergent was also tested in the same manner as in Example 1. As a result, it can be seen that, as in Example 1, it has a practical anti-discoloration property.

[0022]

As described above, the present invention can provide an antibacterial resin exhibiting a stable antibacterial effect on the surface of the resin. In addition, the antibacterial property is improved by disperse the antibacterial agent into the resin and control the amount of the antibacterial material diffused into the resin or the elution amount from the resin surface to improve heat resistance during molding, exposure to ultraviolet rays, and discoloration resistance to chlorine chemicals. A resin can be provided.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C08L 101/00 LSZ 7167-4J

Claims (3)

[Claims] 1. A thermoplastic resin, an antibacterial agent and an additive aid are kneaded, and the antibacterial agent comprises a thiosulfato silver complex salt supported on silica gel and a part of the surface thereof is coated with a hydrolyzate of an alkoxysilane. The antibacterial resin is characterized in that the addition aid is at least one selected from fatty acids, fatty acid amide derivatives, metal soaps and glycidyl methacrylate polymers. 2. The antibacterial resin according to claim 1, wherein the fatty acid is at least one fatty acid selected from stearic acid and lauric acid. 3. The metal soap is at least one metal soap selected from salt compounds of calcium salt, zinc salt, and aluminum salt of stearic acid or lauric acid, respectively. The described antibacterial resin.