JPS6145962B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a novel slime control agent that utilizes two types of synergistic effects. Slime is often generated in industrial water that is generally used for circulation, such as circulating cooling water for pulp slurry during the paper manufacturing process or circulating cooling water for cooling towers, and slime is often generated in circulation equipment, especially in areas where industrial water stagnates, such as on the inner walls of conduits, flow paths, etc. slime tends to adhere to it, causing slime problems. On the other hand, in the circulation path of textile oils in textile factories, slime can adhere to the oiling rollers and get on the threads, causing problems in the next process, or the generation of slime can destroy the oil emulsion, causing the oil circulation. It is often seen that entire processes have to be shut down. Bactericides are mainly used to control slime, but since a wide variety of organisms such as bacteria, fungi, and algae are involved in the generation of slime, fungicides are not very effective. It's hard to get. The present inventors investigated the slime control effects of various fungicides and found that the general formula (In the formula, R ¹ and R ² are hydrogen atoms, halogen atoms, alkyl groups, hydroxyalkyl groups, or the following formula , where R ³ is a hydrogen atom, a halogen atom, a nitro group, an alkyl group, an alkoxy group, n
means an integer from 0 to 4, X represents a halogen atom, except when R ¹ is a hydrogen atom, R ² is a hydroxymethyl group, and X is a bromine atom). Derivative 5-95% by weight, preferably 10-90% by weight
and the following formula By using a mixture consisting of 95 to 5% by weight, preferably 90 to 10% by weight, of 4,5-dichloro-1,2-dithiol-3-one represented by It was discovered that an excellent synergistic effect could be obtained. Furthermore, since the compound of the formula is unstable in an aqueous solution, long-term efficacy could not be expected; however, by adding the compound of the formula, an aqueous solution of the compound of the formula can be stabilized, resulting in a long-term slime control effect. can be kept. Examples of compounds of the formula include 2-chloro-2-
Nitroethanol, 1-chloro-1-nitropropanol-2, 3-chloro-3-nitrobutanol-2, 2-chloro-2-nitrobutanediol 1, 3, 1-chloro-1-nitrobutanol 2,
2-chloro-2-nitrobutanol-1, 2-chloro-2-bromo-2-nitroethanol, 2-
Bromo-2-nitroethanol, 2-bromo-2
-nitropropanol-1,1-(m-nitrophenyl)-2-bromo-2-nitroethanol,
1-(p-methoxyphenyl)-2-bromo-2-
Nitroethanol, 1-(o-chlorophenyl)-
2-bromo-2-nitroethanol, 1-(p-
Examples include methylphenyl)-2-bromo-2-nitroethanol and 1-phenyl-2-bromo-2-nitroethanol. The slime control agent of the present invention is usually used after being dissolved in a solvent, and if desired, a surfactant, a stabilizer,
Auxiliary agents such as anticorrosive agents may also be added. In addition to water, solvents include alcohols such as methanol, ethanol, propanol, butanol, ethylene glycol, glycerin, ketones such as acetone, methyl ethyl ketone, and ethers such as methyl ether, ethyl ether, dioxane, dimethyl sulfoxide, polyethylene glycol, and ethylene glycol monomethyl. Ethers, diethylene glycol monomethyl ether, etc. may be used alone or in mixtures. The amount of the slime control agent of the present invention added is, for example, 0.01 to 100 ppm relative to the amount of water used in the paper manufacturing industry.
Preferably 0.1 to 10 ppm, 1 to 500 ppm preferably 10 to 500 ppm for emulsions such as textile oils, etc.
100 ppm, 50 to 5000 ppm, preferably 100 to 2000 ppm for emulsion such as latex. Examples 1 to 8 The amount of slime generated was measured by the following test method. Vertical 20 with temperature regulator, stirrer and thermometer
Two pieces of lauan material with a length of 20 cm, a width of 5 cm, and a thickness of 1.5 cm were vertically attached as slime amount measuring plates in a water tank measuring 30 cm in width and 20 cm in depth. Fill this tank with white water 10 with a pulp concentration of 0.1% obtained from a paper mill, and add the test chemicals at a ratio of 1 ppm to the white water.
The liquid temperature was set at 28 to 32°C, and stirring was continued for 7 days. After 7 days, the weight of the slime attached to the two plates was measured, and the average value was calculated. The results were as shown in Table 1.

【table】

[Table] Comparative Examples 1 to 9 Tests were conducted in the same manner as Examples 1 to 8 using the comparative drugs shown in the following table. The results were as shown in Table 2.

【table】

[Table] Example 9 4,5-dichloro-1,2-dithiol-3-
A slime control agent consisting of 20 parts of 3-bromo-3-nitropentanediol-2.4 and 80 parts of 3-bromo-3-nitropentanediol-2.4 was added to a machine chest of a certain paper mill at a concentration of 1 ppm based on the input amount of raw paper stock. Conventionally, when organic rhodan compounds were used, paper breaks due to slime occurred frequently on the 6th day of operation, but by using the slime control agent of the present invention, paper breaks due to slime did not occur even after 30 days of continuous operation. It didn't happen. Example 10 22 parts of 4,5-dichloro-1,2-dithiol-3-one and 2,4 parts of 3-bromo-3-nitrobutanediol were added to the condenser of the cooling water system of a chemical factory.
A slime control agent consisting of 78 parts of was added at 5 ppm. If no additives are used, slime will occur and will occur once a month.
However, when the slime control agent of the present invention was added, the removal work could be reduced to once every three months. For comparison, a mixture consisting of 3 parts of 4,5-dichloro-1,2-dithiol-3-one and 97 parts of 3-chloro-3-nitropentanediol-2,4 was similarly used in the condenser of the cooling water system. When the slime was added at a rate of 8 ppm, it was necessary to remove the slime once every one and a half to two months. Example 11 25 parts of 4,5-dichloro-1,2-dithiol-3-one and 3-bromo-3-nitropentanediol-2.
A slime control agent consisting of 75 parts of No. 4 was added at 300 ppm. In the case of no additives, it was necessary to remove slime once every 7 to 10 days, but when the slime control agent of the present invention was used, slime removal work was required once every 3 to 3 and a half months. It was possible to reduce the number of times.

Claims (1)

[Claims] 1. General formula (In the formula, R ¹ and R ² are hydrogen atoms, halogen atoms, alkyl groups, hydroxyalkyl groups, or the following formula , where R ³ is a hydrogen atom, a halogen atom, a nitro group, an alkyl group, an alkoxy group, n
means an integer from 0 to 4, X represents a halogen atom, except when R ¹ is a hydrogen atom, R ² is a hydroxymethyl group, and X is a bromine atom)
5 to 95% by weight of a halogenated aliphatic nitroalcohol derivative represented by and the following formula A slime control agent containing as an active ingredient a mixture consisting of 95 to 5% by weight of 4,5-dichloro-1,2-dithiol-3-one represented by: