JPH0615444B2 - Industrial antibacterial agent - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an industrial antibacterial agent, more specifically, an industrial antibacterial agent which is effective against a wide range of harmful microorganisms and is particularly suitable as an antibacterial agent in an industrial water system for producing pulp and paper. The present invention relates to an antibacterial agent.

BACKGROUND ART In the raw water used when manufacturing wastewater from the papermaking process in the pulp and paper industry, water systems such as circulating cooling water in various industrial fields, water-based paints, paper coating solutions, latex, printing paste, leather, etc. Hazardous microorganisms easily propagate, which is an important cause of reduced productivity and quality deterioration.

Especially in water systems in the pulp and paper mill field, slime is generated due to the proliferation of bacteria, filamentous fungi and yeasts, and the waterway where the pulp slurry flows, especially where the wall surface where the slurry is in contact, a chast, a flow box, a transport pipe, and other pulp At locations where the flow velocity of the slurry becomes low and the slurry stagnates, slime adheres significantly. This slime often separates, causing paper scraps and paper pipe product contamination, as well as causing various disorders due to the growth of microorganisms.

The occurrence of such a failure becomes a particularly serious problem when using a high-speed machine, resulting in a significant decrease in productivity and economic loss.

Further, even in a circulating water system for cooling metalworking oil agents, microorganisms multiply and hinder the cooling performance and emulsifying properties of the oilworking agents, and a bad odor is generated, which worsens the working environment and is a phenomenon unfavorable to public health. Is caused.

Other obstacles due to the growth of harmful microorganisms are also found in industrial products such as water-based paints, paper coating solutions, polymer latex, paper pulp, glue, leather and metalworking oils.

By the way, as an agent for suppressing or controlling the generation of harmful microorganisms in the water system or the industrial product, for example, organometallic compounds, organochlorine compounds, organosulfur compounds, and quaternary ammonium salts have hitherto been used. Compounds and the like have been used, but these compounds are toxic to the human body, give off a bad odor or an offensive odor, and cause undesirable phenomena such as foaming. In addition, these pesticide-containing water systems, when they are thrown into general rivers or the sea, have an adverse effect on fish and shellfish and cause environmental conservation problems.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention overcomes the disadvantages of the conventional industrial antibacterial agents, is harmless to the human body and other living organisms, is not accompanied by a foul odor or a strange odor, and has a wide range. The purpose of the present invention is to provide a novel industrial antibacterial agent effective against harmful microorganisms.

Means for Solving the Problems The inventors of the present invention have conducted diligent research to develop an effective industrial antibacterial agent in which conventional drawbacks have been improved. As a result, 2-bromo-2-bromomethylglutaronitrile has been obtained. By including a combination of (hereinafter abbreviated as BGN) and 4,5-dichloro-1,2-diotyl-3-one (hereinafter abbreviated as DCDT) as an active ingredient, it is possible to achieve the object. The present invention has been completed based on the findings of this finding.

That is, the present invention provides an industrial antibacterial agent characterized by containing (A) BGN and (B) DCDT as active ingredients.

In the present invention, BGN used as the component (A) is represented by the formula Which is already used as an active ingredient of a slime control agent.
(U.S. Pat. No. 3,833,731).

The DCDT used as the component (B) is The compound represented by the formula (1) has already been used alone as an active ingredient of an industrial antibacterial agent (Japanese Patent Publication No. 52-14294).

However, when these compounds are used alone,
The effect is limited to a small number of microorganisms, a sufficient antibacterial effect cannot be obtained, and the effect is also lacking in sustainability, so that it is not always satisfactory in practice.

On the other hand, the industrial antibacterial agent of the present invention in which the component (A) and the component (B) are used in combination exhibits an extremely excellent antibacterial action which cannot be expected from these components alone.
It is effective against a wide range of harmful microorganisms such as filamentous fungi, bacteria and yeasts, regardless of their type.

In the present invention, the weight ratio of the component (A) and the component (B) is 10:
It is preferably used in a ratio in the range of 1 to 1:10.

The industrial antibacterial agent of the present invention is prepared by uniformly mixing the component (A) and the component (B), but in the form of a solution dissolved in water or another solvent, or an emulsion dispersion. It is advantageous to use.

Examples of the solvent that can be used here include alcohol solvents, ketone solvents, ether solvents, hydrocarbon solvents and the like. In addition, the antibacterial agent of the present invention may be used by supporting it on any carrier, and the use mode is not particularly limited, and various methods can be adopted.

The amount of the antibacterial agent to be added varies depending on the microorganism concentration, but is generally 0.01 to 100 ppm in the case of a water system in the field of the pulp and paper industry, etc., and a good bactericidal effect can be obtained at this level. .

Further, in the present invention, dibromocyanoacetamide (hereinafter abbreviated as DBCA) may be blended, and the amount used in this case is preferably 10 parts by weight or less relative to 1 part by weight of BGN.

If desired, a stabilizer, a surfactant and the like can be added to the antibacterial agent of the present invention within a range that does not impair the object of the present invention.

EXAMPLES Next, the present invention will be described in more detail with reference to examples.

Example 1 An industrial antibacterial agent was prepared by mixing the components according to the following formulation.

Formulation 1 component content BGN 10 parts by weight DCDT 10 parts by weight Diethylene glycol monobutyl ether 77 parts by weight Sonopol 900A (emulsifier, manufactured by Toho Chemical Co., Ltd.) 3 parts by weight Formulation 2 components content BGN 20 parts by weight Diethylene glycol monobutyl ether 77 parts by weight Sonopol 900A (supra) 3 parts by weight Formulation 3 component content DCDT 20 parts by weight Diethylene glycol monobutyl ether 77 parts by weight Sonopol 900A (supra) 3 parts by weight Industrial fungicides prepared according to the above Formulations 1 to 3 By the test method, the slime generation preventing effect and the antiseptic effect were examined.

(1) Bacterial growth prevention and slime generation prevention test in wastewater after paper making process In a paper making process of a certain paper mill, antibacterial agents prepared according to the above formulations 1 to 3 were applied to white water bits for 2 hours and 3 times a day. It was added for 7 days so that the concentration in water was 20 ppm, and the number of microorganisms in white water was measured.

As a test method, a white water sample was diluted with sterilized water, a certain amount of this was collected in a petri dish, poured into a dissolved Waxman agar medium, mixed, and solidified into a flat plate. Microbial colonies generated after culturing in an incubator (32 ° C) for 2 days were measured with a colony counter. The number of paper breaks during papermaking was also measured to confirm the sterilization effect. The results are shown in Table 1. For comparison, the case where no industrial antibacterial agent was added was shown as a control.

From Table 1 above, it can be seen that the industrial antibacterial agent (formulation 1) of the present invention has an excellent antibacterial effect. (2) Bacterial growth prevention test in papermaking coating liquid Add broth liquid medium and coating liquid that has been spoiled in advance to a starch-based coating liquid of pH 100, and stir to adjust the concentration to 300 ppm A germicidal agent was added.

After storing this in a thermostat at 32 ° C. for 5 days, the number of viable bacteria in each coating solution was measured. The results are shown in Table 2. For comparison, the result when no industrial antibacterial agent was used is shown as a control.

Example 2 An industrial antibacterial agent was prepared according to the following formulation.

Component content BGN 10 parts by weight DCDT 5 parts by weight DBCA 5 parts by weight Diethylene glycol monobutyl ether 77 parts by weight Sonopol 900A 3 parts by weight In the same manner as in Example 1, a test for preventing bacterial growth in wastewater after the papermaking process and When a slime generation prevention test was conducted, the number of bacteria in white water was 10 ² / ml or less, and the number of paper breaks was 0.

The result of the bacterial growth prevention test in the papermaking coating solution was 10 ² viable cells / ml or less.

Therefore, when using DBCA with BGN and DCDT,
It can be seen that an excellent antibacterial effect can be obtained.

Claims (1)

[Claims] 1. (A) 2-Bromo-2-bromomethylglutaronitrile and (B) 4,5-dichloro-1,2-dithiol-3.
-On, as an active ingredient, an industrial antibacterial agent characterized by the above-mentioned.