JPH09111053A - Rubber containing antimicrobial agent and rubber-made glove and rubber-made finger sac containing antimicrobial agent and their production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rubber latex or a raw rubber which contains a specific inorganic antimicrobial agent and is useful as a raw material for producing rubber gloves and rubber finger sacs preventing microbial infections. SOLUTION: A zeolite antimicrobial agent containing at least one of silver, copper and zinc and/or a silica gel antimicrobial agent are contained preferably in an amount of 0.1-3wt.% based on the rubber components of a rubber latex or a raw rubber. In order to prepare the objective antimicrobial agent-containing rubber latex, preferably, a neutral antimicrobial agent is added together with a dispersant and stabilizer to water, the mixture is crushed and mixed in a ball mill, then the resultant antimicrobial dispersion is mixed under stirring with a rubber latex liquid prepared in a known manner in the art. The objective antimicrobial agent-containing raw rubber is prepared by admixing an antimicrobial agent to raw rubber, as they are kneaded on rolls. The dispersant is preferably dodecylbenzenesulfonate and casein is used as the stabilizer.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rubber containing an inorganic antibacterial agent, a rubber glove or a rubber finger sack containing an inorganic antibacterial agent, and a method for producing them.

[0002]

2. Description of the Related Art Rubber gloves or rubber finger cots are used for medical purposes or when handling hazardous materials, dirt or filth, or to protect a damaged part when a hand or finger is injured. In particular, when fine work is required, it is preferably used. In order to protect hands and fingers, gloves and finger cots containing an antibacterial agent are strongly demanded. Even in food processing, gloves or finger cots containing an antibacterial agent without side effects are required to prevent food poisoning.

However, gloves and finger cots containing an antibacterial agent are not widely marketed because the antibacterial agent is difficult to mix with rubber. There are two types of antibacterial agents: organic antibacterial agents and inorganic antibacterial agents. Organic antibacterial agents are easy to mix with rubber, but easily ooze out and need to be heated at the time of vulcanization when manufacturing gloves and finger cots. However, at this time, the antibacterial agent is decomposed or volatilized, which is not preferable.
From this viewpoint, it is recommended to use an inorganic antibacterial agent, but the technology of mixing the inorganic antibacterial agent into rubber is insufficient, and gloves containing antibacterial agents or finger cots containing antibacterial agents are not suitable for industrial use. It is the fact that it is not manufactured in Japan.

Japanese Patent Application Laid-Open No. 4-361601 discloses a sanitary glove manufactured from a plastic sheet mixed with a silver ion-containing glass that gradually elutes silver ions. The gloves disclosed here are made of plastic,
It is not made from rubber. From the description of the patent publication, it can be seen that glass has a small particle size, is difficult to mix with glass, and difficult to manufacture gloves.

[0005]

SUMMARY OF THE INVENTION The present invention provides a technique for efficiently mixing an inorganic antibacterial agent into rubber, and a rubber glove or a finger sack containing an antibacterial agent based on the technique. It is intended to provide manufacturing technology.

[0006] In the present invention, natural rubber and synthetic rubber are used. Synthetic rubber is a type of synthetic polymer mainly composed of butadiene, chloroprene, isoprene, or the like.
On the other hand, natural rubber is obtained from an emulsion collected from a rubber tree. In the production of rubber, it is used as a so-called latex in which a rubber component is dispersed in an emulsion or as a sheet-like raw rubber obtained by adding an acid or the like to the latex and coagulating it. Latex is mainly used for thin products, and raw rubber is mainly used for thick products. Products such as gloves and finger cots often use natural rubber as a raw material due to their properties. Also in the present invention, natural rubber is preferably used.

[0007]

The present invention provides a technique for efficiently mixing an inorganic antibacterial agent with rubber latex or raw rubber, and based on the technique, a rubber glove or a rubber finger containing an inorganic antibacterial agent. It is intended to provide sacks and their manufacturing technology.

That is, the present invention comprises a rubber latex or raw rubber containing a zeolite antibacterial agent and / or a silica gel antibacterial agent containing at least one of silver, copper and zinc, and at least one of silver, copper and zinc. Contains a zeolite antibacterial agent and / or a silica gel antibacterial agent,
A rubber finger sack or rubber gloves. The content of the antibacterial agent to be used is 0. 0 with respect to the rubber component of rubber latex, raw rubber, rubber gloves or rubber finger cots.
It is 1 to 3.0% by weight.

The rubber latex containing the antibacterial agent can be obtained by mixing and stirring the antibacterial agent dispersion liquid containing the antibacterial agent, the dispersant and water and the rubber latex.
Then, the raw rubber containing the antibacterial agent can be obtained by kneading the raw rubber with the antibacterial agent on the roll.

Further, a mold of a glove or a finger sack is dipped in a mixed solution containing the above-mentioned rubber latex and an antibacterial agent, and then the mold having the rubber component attached thereto is pulled out from the mixed solution and dried, and then heat treated after drying. By carrying out, it is possible to manufacture thin rubber gloves or rubber finger cots containing an antibacterial agent. Then, the above-mentioned raw rubber containing the antibacterial agent is put into a glove or finger sack mold, and pressed and heat-treated to produce a thick rubber glove or rubber finger sack containing the antibacterial agent.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, rubber is used in the form of rubber latex or raw rubber, and rubber latex is mainly used for thin materials and raw rubber is mainly used for thick materials. When rubber latex is used, various additives such as a vulcanizing agent, a vulcanization accelerator, an antioxidant, a filler, and a dispersant are added to the rubber latex, and the rubber latex is appropriately processed into a product.

On the other hand, when raw rubber is used, a weak acid is added to the rubber latex to coagulate the rubber component, and the coagulated rubber component is taken out into a sheet while squeezing with a roll, pickled well and dried. Smoked as necessary to obtain raw rubber. Then, rubber additives such as a vulcanizing agent, a vulcanization accelerator, an antioxidant, a filler, and a dispersing agent are added to the sheet-like raw rubber, and the resulting raw rubber is put into an appropriate mold, pressed, heated and subjected to a heat treatment. Have gained.

The antibacterial agent used in the present invention is a zeolite antibacterial agent and / or a silica gel antibacterial agent containing at least one metal selected from silver, copper and zinc as described above. The content of these metals in the zeolite-based antibacterial agent can be changed as required. Specifically, an antibacterial agent “Bakutekira” (trade name) manufactured by Kanebo Kasei Co., Ltd. can be suitably used. "Bactekiller" includes those containing only silver, those containing silver and copper, and those containing silver and zinc. 10% by weight, 30 to 40% by weight of zinc
contains.

In the case of "Bactekiller", this antibacterial agent is added to rubber components in rubber, gloves or finger cots in an amount of 0.
It is used in the range of 1 to 3.0% by weight. When the content is 0.1% by weight or less, the effect as an antibacterial agent is small, and when the content is more than 3.0% by weight, the antibacterial effect is not so large.

As the antibacterial agent, a silica gel antibacterial agent such as "Silwell" (trade name) manufactured by Fuji Silysia Chemical Ltd.
Can also be suitably used. This is an inorganic antibacterial agent in which a silver thiosulfato complex salt is supported on silica gel, and its use amount is 0.1 to 3.0% by weight based on the rubber component in rubber, gloves or finger cots.

In order to mix the antibacterial agent with the rubber latex, it is first necessary to disperse the antibacterial agent in water. For this purpose, various methods are used. It is preferable to add an antibacterial agent together with a dispersant and a stabilizer to water, and pulverize and mix in a ball mill. The dispersion of the antimicrobial agent needs to have the antimicrobial agent dispersed well. To this end, the use of dispersants is essential.
So-called surfactants are preferably used. Although a cationic surfactant, an anionic surfactant and a nonionic surfactant are used, the effect of an anionic surfactant can be expected.
Specifically, naphthalenesulfonate, dodecylbenzenesulfonate, toluenesulfonate and the like are preferably used. As the stabilizer, an alkaline substance such as aqueous ammonia and casein are used. These are used to prevent coagulation of the rubber latex and stabilize the viscosity.

Next, various additives for rubber such as a vulcanizing agent, a vulcanization accelerator, an antioxidant, a filler, a dispersant, a thickener and a stabilizer are added to the rubber latex according to a standard method to prepare a latex liquid. To prepare. The latex preparation liquid and the antibacterial agent dispersion liquid are appropriately mixed and stirred to prepare a rubber latex mixed liquid containing the antibacterial agent. At this time, the rubber latex liquid
First, the antibacterial agent dispersion is added, and then other additives such as vulcanizing agents, vulcanization accelerators, antioxidants, fillers, dispersants, thickeners, stabilizers, etc. may be added. Good, first add various additives such as vulcanizing agent, vulcanization accelerator, antioxidant, filler, dispersant, thickener, stabilizer to latex, and then disperse antibacterial agent in the latex preparation liquid. Liquid may be added.

When an antibacterial agent is added to raw rubber, there is no particular problem, but when an antibacterial agent is added to rubber latex,
There are points to note. Rubber latex generally has the property of coagulating when the pH of the liquid changes. For this reason, rubber latex is usually used after being made slightly alkaline. From this viewpoint, it is not preferable that the antibacterial agent added to the rubber latex changes the PH of the latex. Preferably, a neutral antimicrobial agent is selected.

Next, a mold of gloves or finger cots is dipped in the latex mixed solution containing the antibacterial agent to adhere the rubber component to the mold. The mold is lifted from the mixture and dried while rotating. At this time, immersion and drying are repeated a plurality of times, if necessary, until the desired thickness is reached. When the desired thickness is reached, after drying, heat treatment is performed at a temperature of 100 to 120 ° C., so-called vulcanization is performed and chlorination is performed to obtain a product.
The rubber gloves referred to here include not only those manufactured only from rubber but also rubber gloves with cloth. Gloves with cloth can be similarly manufactured by fitting cloth gloves into a mold and dipping the gloves in rubber latex.

The raw rubber containing the antibacterial agent can be obtained by kneading an ordinary sheet raw rubber with an antibacterial agent, a vulcanizing agent and other additives on a roll. Gloves and finger cots can be manufactured by placing the raw rubber in a mold and performing a heat treatment. The heat treatment at this time is performed at a higher temperature and in a shorter time than in the case of rubber latex.

When kneading the antibacterial agent with the raw rubber, the antibacterial agent may be first added to the raw rubber and kneaded, and then various additives for rubber may be added and further kneaded, or the various additives for rubber may be added with the raw rubber. May be added and kneaded, and then an antibacterial agent may be added and kneaded.

[0022]

EXAMPLES In the following examples, "parts" and "%" all indicate "parts by weight" and "% by weight".

1. Preparation of Antimicrobial Agent Dispersion (A) In a ball mill, 20 parts of an antimicrobial agent of Baktekiller BM-102 (trade name, manufactured by Kanebo Kasei Co., Ltd.), 5 parts of dodecylbenzenesulfonic acid, and a stabilizer 10 containing ammonia and casein 10
Parts were added together with 108 parts of water, and pulverized and mixed at room temperature for 5 hours to obtain a dispersion (A) of an antibacterial agent.

2. Preparation of Latex Preparation Solution (B) A 60% natural rubber latex 16 was added to a ball mill.
6.6 parts, vulcanizing agent 0.8 part, vulcanizing aid 0.4 part, vulcanizing accelerator 0.5 part, antioxidant 0.5 part, dispersant 0.01
Parts, thickener 0.6 parts, filler 0.2 parts, stabilizer 0.3 parts and water 2 parts, and pulverized and mixed at room temperature for 3 days,
After aging for 2 days, a natural rubber latex preparation solution (B) was obtained.

3. Preparation of latex mixed liquid containing antibacterial agent (C) 10.75 parts of antibacterial agent dispersion liquid (A) was added to the natural rubber latex preparation liquid (B) prepared above, and the mixture was stirred well and the antibacterial agent was a rubber component. A natural rubber latex mixed solution (C) containing an antibacterial agent was prepared to be 1%. This liquid is
Stirring was continued to maintain good mixing.

4. Manufacture of gloves (1) Rubber gloves were manufactured using the natural rubber latex mixed solution containing an antibacterial agent prepared in 3 (C). Mixed liquid (C)
A glove mold was immersed in the mold, and rubber was adhered to the mold. Thereafter, the mold was pulled up and rotated, and dried while sending warm air. This operation was repeated twice to obtain a rubber having a thickness of about 0.3 mm. The rubber-attached glove was placed in a vulcanizer and heated at 115 ° C. for about 10 minutes. The heat-treated product was chlorinated to obtain a rubber glove product.

5. Manufacture of finger sack (1) In the same manner as in 4, by changing the amount of the antibacterial agent dispersion liquid (A) added to the natural rubber latex preparation liquid (B), those having different antibacterial agent contents, that is, antibacterial agents 0.2%, 0.
A finger sack product containing 3%, 0.5% and 2% was obtained.

6. Manufacture of gloves (2) A sheet of natural raw rubber is rolled on the roll and the natural raw rubber 10
To 0 parts, 1 part of "Sillwell" B03 (trade name, manufactured by Fuji Silysia Chemical Ltd.) was added as an antibacterial agent and kneaded. Thereafter, 3 parts of a vulcanizing agent, 1.5 parts by weight of a vulcanization accelerator, 0.5 part of an antioxidant, and 3.5 parts of a filler were added and kneaded to obtain a rubber sheet for processing. The antibacterial agent-containing rubber sheet thus obtained was put into a glove mold, pressed, and heated at a temperature of 150 ° C. for about 5 minutes to obtain a glove product.

7. Manufacture of finger cot (2) 40% NBR rubber latex 25 in ball mill
0 parts and a vulcanizing agent 0.5 parts, a vulcanization aid 5.0 parts, a vulcanization accelerator 1.0 part, a dispersant 0.015 parts, a filler 1.0, a stabilizer 7.0 parts and water 13 parts were added, and the mixture was pulverized and mixed at room temperature for 3 days, and then aged for 2 days to obtain an NBR rubber latex preparation liquid (D). This NBR rubber latex preparation liquid (D) is added to the antibacterial agent dispersion liquid (A)
0.75 parts was added and mixed well by stirring to prepare an NBR rubber latex mixed solution containing an antibacterial agent, which makes the antibacterial agent 1% with respect to the rubber component. A finger-sack mold was dipped in the mixed solution containing the antibacterial agent, and rubber was adhered to the mold. Thereafter, the mold was pulled up and rotated, and dried while sending hot air. This operation was repeated twice to obtain a rubber having a thickness of about 0.3 mm. Put the rubber-attached finger sack in a vulcanization can,
And heat-treated for about 10 minutes. The heat-treated product was chlorinated to obtain a finger sack product.

8. Measurement of antibacterial effect (1) The rubber glove product obtained in 4 was cut into a piece of about 5 cm square, and an antibacterial effect was measured based on this small piece to measure the antibacterial effect. As shown in Table 1, after 24 hours, almost no Escherichia coli or staphylococci were recognized, and the antibacterial effect of the rubber glove containing the antibacterial agent was recognized. The test method is as follows.

[0031]

[Table 1]

Test method: Each bacterial cell was put on a regular agar medium to 37
After culturing at 18 ° C. for 18 to 24 hours, the cells were suspended in a normal broth medium having a concentration of one hundredth to prepare about 100,000 CFU / ml. After dropping 0.5 ml of the test bacterial solution on the sample,
Store under humidified conditions at 37 ° C for 4 hours and 24 hours. After storage, the dropped bacterial solution was sucked up with a dropper, and the viable cell count in this solution was determined by the pour plate culture method using ordinary agar medium (37
(° C, 1 day) and shown as CUF value per ml. Here, the CFU value is a colony formation unit. Also, E. coli is
erichia coli IFO 3301, Staphylococcus aureus, Staphylococcu
saureus ATCC 6538P.

9. Measurement of antibacterial effect (2) A 3 cm square test piece was cut out from the finger cot containing the antibacterial agent produced in 5, and an antibacterial test based on this small piece was performed. As shown in Table 2, after 24 hours, almost no Escherichia coli or Staphylococcus was observed, and the antibacterial effect of the finger sack containing the antibacterial agent was recognized. The test method is as follows.

[0034]

[Table 2]

Test method: About 15 ml of agar medium for bacteria is poured into a sterile petri dish. After the agar is solidified, about 5 ml of an agar medium containing the bacterial solution of the test bacteria is overlaid. The specimen was attached to the center of the medium, covered, and cultured at 37 ° C. for 24 hours to observe the state of the bacteria. The bacteria used were Escherichia coli I
FO 3301 and Staphylococcus aureus ATCC 6538
P.

[0036]

The rubber having antibacterial properties of the present invention is a raw material for products used in fields where antibacterial properties are required. In addition, the rubber glove or rubber finger cot of the present invention has an action of sterilizing bacteria and the like adhering to the glove or finger cot, reduces the risk of food poisoning in food processing, and is useful in the medical field. In addition, it can prevent bacterial infection, prevent contamination by bacteria even when handling unclean materials, and prevent bacterial contamination caused by wounds even when a hand or finger has a wound. The effect can be expected.

Claims (8)

[Claims] 1. A rubber latex or a raw rubber containing a zeolite antibacterial agent and / or a silica gel antibacterial agent containing at least one of silver, copper and zinc. 2. A rubber finger sack or rubber glove containing a zeolite antibacterial agent and / or a silica gel antibacterial agent containing at least one of silver, copper and zinc. 3. The content of the antibacterial agent with respect to the rubber component,
The rubber latex or raw rubber according to claim 1, which is 0.1 to 3.0% by weight. 4. The rubber glove or rubber finger sack according to claim 2, wherein the content of the antibacterial agent is 0.1 to 3.0% by weight based on the rubber component. 5. A rubber latex containing an antibacterial agent, characterized in that an antibacterial agent dispersion containing a mixture of an antibacterial agent, a dispersant and water is mixed with the rubber latex and stirred when the rubber latex containing the antibacterial agent is produced. Production method 6. When producing raw rubber containing an antibacterial agent,
A method for producing a raw rubber containing an antibacterial agent, which comprises kneading the antibacterial agent with the raw rubber on a roll 7. When manufacturing a rubber glove or a rubber finger sack containing an antibacterial agent, a glove or finger sack mold is dipped in the antibacterial agent-containing rubber latex mixed solution prepared by the method of claim 5, Then, a mold to which a rubber component is attached is pulled out from the mixed liquid and dried, and a heat treatment is performed after drying, and a method for producing a rubber glove or a rubber finger sack containing an antibacterial agent. 8. When producing rubber gloves or rubber finger cots containing an antibacterial agent, the antibacterial agent-containing raw rubber produced by the method according to claim 6 is put into a glove or finger sack mold,
Method for producing rubber gloves or rubber finger cots containing an antibacterial agent, characterized by pressing and heat treatment