JPS5822082B2 - Microbial control agent - Google Patents

Description

[Detailed description of the invention] The present invention relates to a microbial control agent.

More specifically, the present invention relates to a starch-containing microbial control agent characterized by containing 2,3,3-triiodoallyl alcohol and diethylene glycol monoalkyl ether in which the alkyl group has 1 to 4 carbon atoms.

2.3.3-4'J iothoallyl alcohol is known as a low-toxicity bactericide, and is used as a slime control agent for the paper industry, a fungicide, and a fungicide for wood products, bamboo products, plastic products, etc. It is useful as a microbial control agent such as a paint preservative and a fungicide.

This 2,3,3-4 lyodoallyl alcohol is generally used as a liquid product, but it is used by dissolving it in an organic solvent, which is poorly water-soluble, and then dispersing it in water.

However, this alcohol is poorly soluble depending on the type of organic solvent; for example, aliphatic polyhydric alcohols such as ethylene glycol and tetraethylene glycol, and cellosolve solvents such as ethylene glycol monomethyl ether and ethylene glycol monobutyl ether have a 2.゜3.3-
It takes several hours to dissolve 10% of 4-lyodoallyl alcohol.

Also, dimethylformamide (hereinafter abbreviated as DMF), N-
Although methylpyrrolidone (hereinafter abbreviated as NMP) has excellent solubility, it releases iodine from 2,3,3-4 lyodoallyl alcohol, and in some cases, starch is used in paper pulp white water systems. Because of the large amount of free iodine, the free iodine reacts with starch, turning the white water blue and coloring the water.As a result, even the paper becomes colored and contaminated, and the microbial control effect is also reduced, which can lead to serious problems.

The object of the present invention is to provide a microbial control agent that overcomes the drawbacks of the prior art. As a result of intensive research on 2,3.3-
The present inventors have discovered that a microbial control agent containing 4-lyodoallyl alcohol and diethylene glycol monoalkyl ether having an alkyl group of 1 to 4 carbon atoms achieves the above object, and has completed the present invention.

According to the present invention, the microbial control agent can be prepared by dissolving 2,3,3-triodoallyl alcohol in ethylene glycol monoalkyl ether.

As the 2,3.3-4 lyodoallyl alcohol, one obtained by a conventional method may be used.

The carpitol-based diethylene glycol monoalkyl ether used here has an alkyl group having 1 to 4 carbon atoms, and includes, for example, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monofi-7"ropylether, and diethylene glycol monomethyl ether. -1so-7”
Lopylether, diethylene glycol mono-11-7
"Tyl ether, diethylene glycol mono-1so-
Examples include butyl ether, diethylene glycol mono-t-butyl ether, and the like.

These solvents are 2.3.3% higher than aliphatic polyhydric alcohols such as ethylene glycol and tetraethylene glycol, and cellosolve solvents such as ethylene glycol monomethyl ether and ethylene glycol monoethyl ether.
- It has a fairly high dissolving power for triiodoallylic alcohol, and unlike DMF or NMP, it does not liberate iodine, so there are no problems caused by it, such as coloring of paper products, wood products, bamboo products, etc. Does not occur.

The blending ratio of 2,3.3 hydriodoallyl alcohol and diethylene glycol monoalkyl ether is 1 to 20:
99-80, preferably 5-10:95-90.

When using this mixture, it is common to use it by dispersing it in water, and if the pesticide is not uniformly dispersed in the water, the amount of pesticide that comes into contact with the bacteria will be lower than the amount added, resulting in poor efficiency. Therefore, it is preferable to further add a surfactant to the above mixture.

The effectiveness as a microbial control agent is closely related to the particle size of the microbial control agent dispersed in water, and it is known that the effect decreases when the particle size is 5μ or more, but the microbial control agent of the present invention When dispersed in water, the particle size is about 0.5 to 2μ, showing a good pesticidal effect.

Examples of the surfactant include anionic surfactants such as carboxylate type, sulfonate type such as sodium alkylsulfonate and sodium alkylbenzenesulfonate, sulfuric acid ester type, and phosphoric acid ester type, and cationic surfactants such as surfactant. Quaternary ammonium salt type, amine salt type, etc., amphoteric surfactants, such as carboxylate type, sulfonate type, sulfuric acid ester type, etc., and nonionic surfactants, such as polyethylene glycol type (ether type, ester type), Examples include alkylphenol type and polyhydric alcohol fatty acid (partial) ester type.

The blending ratio of this surfactant and the mixture is 0.5 to 10:9.
9.5-90, preferably 1-5:99-95.

Among these surfactants, nonionic surfactants have particularly excellent dispersibility, and among them, alkylphenol type surfactants are preferred, and there is no problem in terms of foamability.

The microbial control agent of the present invention is useful for slime control in starch-containing systems, such as the paper industry, wood products and bamboo products.
It is used for purposes such as mildew prevention and antiseptic purposes, but in this case, the standard addition amount of the microbial control agent of the present invention is 5 to 5 for the paper manufacturing industry.
0 ppm and about 10 to 11000 ppm in other cases.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example I Predetermined amount of triiodoallyl alcohol and Table 1 in a test tube
After adding the indicated solvent and stirring, the mixture was allowed to stand in a dark place at 40°C or lower for 20 days.

After 20 days, the test tube was taken out and the amount of free iodine was measured by iodine starch reaction.

The results are shown in Table-1. Note: * indicates a comparative example.

As is clear from Table 1 above, the fungicide of the present invention has a
It does not release iodine even if left for days, making it a stable disinfectant over a long period of time.

On the other hand, conventional solvents DMF and NMP liberate iodine of 3.7 and 1.1, respectively, and 2,3
．． Not only is the 3-4'J iodoallyl alcohol wasted, but the free iodine may have serious adverse effects such as coloring the white water.

Example 2 A microbial suppression test was conducted on the microbial control agent of the present invention used in Example 1 immediately after production and after being left standing for 20 days.

A 1/10 concentration bouillon medium (pH 7) was inoculated with E and Co11-k-12 strains as test bacteria, and the microbial maximum/JS inhibitory concentration (MIC24) was determined 24 hours later.

As a result, the MIC24 of the non-inventive organism control agent was constant at 30 ppm immediately after production and after standing for 20 days, indicating that diethylene glycol monomethyl ether had no adverse effect on the microbial control property.

Example 3 Six beakers were prepared with 10 parts by weight of triiodoallyl alcohol, 88 parts by weight of diethylene glycol monomethyl ether, Nirasan Nonion NS-208 (manufactured by NOF Corporation) as an alkylphenol type nonionic surfactant, and Nilasan as an ester type. Nonion 0-6 (same as above), ether type and Nirasan nonion -215 (
PJ), Rapizol B-8 as anionic surfactant
0 (same as above), Nirasan Cation M-2 (same as above) as a cationic surfactant, and Nirasan Anone BF (same as above) as an amphoteric surfactant were added in an amount of 2 weight each and stirred vigorously to produce a microbial control agent.

Then, 11,000 pp of this microbial control agent was added to a beaker filled with water and stirred.

After leaving it for 15 minutes, the dispersion state was observed with the naked eye.

As a result, the dispersibility of the sample with nonionic surfactant added was better than that of the sample with other surfactant added,
Although a slight amount of precipitate was observed in the ether type and the ethyl phenol type, no precipitate was formed at all in the alkylphenol type, which was uniformly dispersed.

On the other hand, in the samples containing anionic, cationic, and amphoteric surfactants, slightly more precipitate was observed than in the ether type nonionic surfactants.

Example 4 Liquid sulfuric acid pan ± (A12
1 (containing 038%) (for pulp) and 3 (for pulp) starch were added.

After storing the microbial control agent prepared as shown in Table 2 at 40℃ for 20 days, 30p of the slurry was added to the slurry.
pm was added to prepare handmade paper according to JISP8209.

The whiteness of this handmade paper was measured according to JISP8123.

The results are shown in Table-2.

From Table 2 above, there is a difference of 1.9 to 2.8 factors in whiteness between the case where the microorganism control agent of the present invention is used and the case where the conventional microorganism control agent containing DMF or NMP is used. can be,
It can be seen that the microbial control agent of the present invention clearly increases the product value of starch-containing systems.

Claims (1)

[Claims] 1 2,3.3-) IJ A starch-containing microbial control agent characterized by containing iodoallyl alcohol and ethylene glycol monoalkyl ether in which the alkyl group has 1 to 4 carbon atoms.