Bactericide for industrial cooling water

A cooling water and bactericide technology, applied in biocide, sterilization/microdynamic water/sewage treatment, application, etc., can solve problems such as poor solubility, reduce precipitation and scaling, improve stability, overcome pro- Poor water effect

Active Publication Date: 2022-03-11
湖南省希润弗高分子新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some of these organic fungicides have poor solubility in water and usually exist in the form of oil emulsion

Method used

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  • Bactericide for industrial cooling water
  • Bactericide for industrial cooling water
  • Bactericide for industrial cooling water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the preparation of N-alkyl benzimidazole

[0037] This quaternary ammonium salt surfactant is made by following equation:

[0038] 1)

[0039] 2)

[0040] 3)

[0041] 4)

[0042] Prepared by the following steps respectively:

[0043] With 1mol (118g) benzimidazole, 1.04mol (259g) n-dodecyl bromide and 15mmol (5g) phase transfer catalyst Bu 4 NBr and toluene were placed in the reactor, stirred and heated to 65°C, and 300mL of 40wt% sodium hydroxide was slowly added dropwise. After the dropwise addition, the temperature was raised to 85°C for 4 hours of reaction; the organic phase was separated, and the water phase was washed with toluene for 3 Once, the organic phases were combined, dried with anhydrous calcium chloride, and distilled under reduced pressure to obtain 0.981mol (281g) of N-n-dodecylbenzimidazole.

[0044] With 1mol (118g) benzimidazole, 1.05mol (217g) brominated n-decane and 15mmol (5g) phase transfer catalyst Bu 4 NBr and tolu...

Embodiment 2

[0047] Embodiment 2: the preparation of benzimidazole quaternary ammonium salt surfactant

[0048] Compound 1 is prepared by the following reaction equation:

[0049]

[0050] Prepared by the following steps:

[0051] Dissolve 0.1mol (28.7g) of N-dodecylbenzimidazole in 120mL of acetonitrile and place it in a reactor connected to a reflux condenser;

[0052] 0.05mol (10.1g) Br(CH 2 ) 3 Br was placed in a constant pressure dropping funnel, protected by a nitrogen flow, stirred and heated in the reactor until the temperature of the liquid rose to 55°C;

[0053] Open the constant pressure dropping funnel, and drop Br(CH 2 ) 3 Br; after the dropwise addition, heat up to reflux reaction, TLC monitors until the reaction is complete; the developing solution is a mixture of water and methanol in a ratio of 1:3;

[0054] After cooling, acetonitrile was distilled off under reduced pressure to obtain light yellow compound 1.

[0055] Compound 2 is prepared by the following reac...

Embodiment 3

[0083] Embodiment 3: Bactericide for industrial cooling water

[0084] A kind of bactericide for industrial cooling water is made up of 1 part of quaternary ammonium salt surfactant shown in the following table and 1000 parts of polyethylene glycol shown in the following table:

[0085] Table 1 Bactericides for industrial cooling water

[0086] Example 3a Example 3b Example 3c Example 3d Example 3e Example 3f Compound 1 Compound 2 Compound 3 Compound 4 Compound 5 Compound 6 PEG-6 PEG-6 PEG-6 PEG-6 PEG-6 PEG-6 Example 3g Example 3h Example 3i Example 3j Example 3k Example 3l Compound 2 Compound 2 Compound 2 Compound 3 Compound 3 Compound 3 PEG-4 PEG-8 PEG-10 PEG-4 PEG-8 PEG-10

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PUM

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Abstract

The invention discloses a bactericide for industrial cooling water, which comprises a quaternary ammonium salt surfactant as shown in formula I and polyethylene glycol, and the polyethylene glycol is liquid at 25 DEG C; in the formula I, n is equal to 3-6; m is equal to 9-14, the bactericide for the industrial cooling water not only can effectively kill bacteria in industrial cooling water wastewater, but also can effectively inhibit generation of the bacteria, and the content of the bacteria can still be kept at a low level after the bactericide is used for more than one week; the bactericide for the industrial cooling water has corrosion inhibition on metal containers, and can also improve the weather resistance of the cooling water.

Description

technical field [0001] The invention relates to the technical field of fine organic chemicals, in particular to a fungicide for industrial cooling water. Background technique [0002] In the field of plastic production technology, in the production process of masterbatches with polyethylene or polypropylene as the carrier, additives such as carrier and toner are extruded by a screw extruder, pulled out, cooled by cooling water, and then cut. grain. During this period, a large amount of cooling water is required, and this type of cooling water is usually in the form of an open type. Because it is not completely closed, usually the air, dust, flocs, etc. are easy to enter the cooling water system, causing the growth of microorganisms. Bacteria in cooling water mainly include heterotrophic bacteria, autotrophic bacteria, mold, yeast and so on. Bacteria that use organic matter as a carbon source are called heterotrophs. The main hazard of molds is that they produce slime depo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N43/52A01N33/12A01N25/02A01P1/00C07D235/06C02F1/50
CPCA01N43/52A01N33/12A01N25/02C07D235/06C02F1/50
Inventor 匡佩燕郭振威
Owner 湖南省希润弗高分子新材料有限公司
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