Efficient sterilizing and killing agent for circulating water system and preparation method of efficient sterilizing and killing agent

Abstract

The invention discloses an efficient sterilizing and killing agent for a circulating water system and a preparation method of the efficient sterilizing and killing agent, and belongs to the technical field of self-cleaning coating agents. The invention relates to a flame retardant, which is prepared from the following components in percentage by mass: 10 to 20 percent of DBNPA, 50 to 56 percent of polypropylene glycol, 25 to 28 percent of water, 4 to 5 percent of potassium bromide and 0.1 to 0.5 percent of hydrogen bromide. According to the prepared efficient sterilizing and killing agent for the circulating water system, the use amount of an organic solvent is not increased, the water consumption is further controlled within 30%, polypropylene glycol and water in a specific proportion and an inorganic active bromine source are matched, the sterilizing and killing performance can be improved, the storage loss of DBNPA is further reduced, and the storage service life is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of self-cleaning coating agent technology, specifically relating to a highly efficient bactericide and disinfectant for circulating water systems and its preparation method. Background Technology

[0002] Dibromocyanoacetamide (DBNPA), also known as 2,2-dibromo-2-cyanoacetamide, 2,2-dibromo-3-nitrilopropionamide, 2,2-dibromo-2-cyanoacetamide, or simply DBNPA, is a relatively safe sterilizing agent. Due to the multiple degradation pathways of DBNPA and its intermediates, proper use in industrial water systems results in only trace amounts of these compounds remaining in the effluent. Chemical and biological decomposition, along with dilution of the wastewater, rapidly eliminates these traces. Therefore, when used correctly, DBNPA does not pose a serious toxicity hazard to fish, making it a relatively safe sterilizing agent with a significant market share in routine sterilization.

[0003] Patent application publication number CN 104957137A discloses a disinfectant composition containing DBNPA, comprising: 10-20 wt% DBNPA, 24-39 wt% organic solvent, 39-63 wt% water, 1-3 wt% stabilizer, and 0.04-0.08 wt% regulator; the stabilizer is selected from at least one of cyanoacetic acid, sodium bromide, and 2,2-dibromomalonamide; the regulator is selected from at least one of hydrochloric acid, aminosulfonic acid, citric acid, and phosphoric acid; and the organic solvent is 1,3-butanediol and tetraethylene glycol. Compared with existing products, the DBNPA-containing disinfectant composition prepared by this method uses a lower amount of organic solvent, reducing the high COD problem caused by organic solvents in the system. Secondly, the addition of a suitable stabilizer reduces the degradation rate of DBNPA in aqueous solutions, increases its storage temperature, and extends the shelf life of solution products to more than 18 months. Third, solvents with stronger solubilizing ability and better antifreeze properties are used, ensuring that the product does not freeze or precipitate at -5 degrees Celsius; at even lower temperatures, if freezing occurs, it can recover its original state above 0 degrees Celsius without any impact on performance. However, after 18 months, the DBNPA content retention rate of the formulation composition was only 91.84% at most, with a DBNPA loss of about 10%. Summary of the Invention

[0004] The purpose of this invention is to provide a highly efficient bactericide and disinfectant for circulating water systems, further reducing the storage loss of DBNPA and increasing its storage life.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] The highly efficient bactericide and disinfectant for circulating water systems comprises the following components by mass percentage: 10–20% DBNPA, 50–56% polypropylene glycol, 25–28% water, 4–5% potassium bromide, and 0.1–0.5% hydrogen bromide.

[0007] More preferably, the mass ratio of polypropylene glycol to water is 2:1.

[0008] The preparation method of the highly efficient bactericide and disinfectant for circulating water systems is as follows: Polypropylene glycol is added to a reaction vessel, DBNPA is added under ice bath conditions, and after stirring evenly, half of the deionized water is added, potassium bromide is added, and the mixture is stirred for more than 5 minutes until completely dissolved. Hydrogen bromide is added to ensure that the pH value of the solution is in the range of 3 to 4. Finally, the remaining half of the water is added, and the mixture is stirred evenly to obtain the highly efficient bactericide and disinfectant for circulating water systems.

[0009] Ideally, the temperature of the solution should be controlled below 35°C throughout the entire preparation process.

[0010] Ideally, the system should be placed in an ice bath before adding DBNPA.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The highly efficient bactericide and algae-killing agent for circulating water systems prepared by this invention does not increase the use of organic solvents. Instead, it further controls the water consumption to within 30%, and is formulated with a specific ratio of polypropylene glycol and water, as well as an inorganic active bromine source. This can increase the bactericidal and algae-killing performance, further reduce the storage loss of DBNPA, and improve its storage life. Detailed Implementation

[0013] The present invention will be further described below with reference to various embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0014] Example 1

[0015] The highly efficient bactericide and disinfectant for circulating water systems provided in this embodiment comprises the following components by mass percentage: 20% DBNPA, 50% polypropylene glycol, 25% water, and 5% potassium bromide. The preparation process is as follows: Polypropylene glycol is added to a reaction vessel, followed by DBNPA under ice bath conditions. After stirring until homogeneous, half the volume of deionized water is added, then potassium bromide is added and stirred for at least 5 minutes until completely dissolved. Hydrogen bromide is added to ensure the pH of the solution is within the range of 3-4. Finally, the remaining half of the water is added, and the mixture is stirred until homogeneous to obtain the highly efficient bactericide and disinfectant for circulating water systems 1.

[0016] Example 2

[0017] The highly efficient bactericide and disinfectant for circulating water systems provided in this embodiment comprises the following components by mass percentage: 11% DBNPA, 56% polypropylene glycol, 28% water, and 5% potassium bromide. The preparation process is as follows: Polypropylene glycol is added to a reaction vessel, followed by DBNPA under ice bath conditions. After stirring until homogeneous, half the volume of deionized water is added, then potassium bromide is added and stirred for at least 5 minutes until completely dissolved. Hydrogen bromide is added to ensure the pH of the solution is within the range of 3-4. Finally, the remaining half of the water is added, and the mixture is stirred until homogeneous to obtain the highly efficient bactericide and disinfectant for circulating water systems, 2.

[0018] Example 3

[0019] The highly efficient bactericide and disinfectant for circulating water systems provided in this embodiment comprises the following components by mass percentage: 12% DBNPA, 56% polypropylene glycol, 28% water, and 4% potassium bromide. The preparation process is as follows: Polypropylene glycol is added to a reaction vessel, followed by DBNPA under ice bath conditions. After stirring until homogeneous, half the volume of deionized water is added, then potassium bromide is added and stirred for at least 5 minutes until completely dissolved. Hydrogen bromide is added to ensure the pH of the solution is within the range of 3-4. Finally, the remaining half of the water is added, and the mixture is stirred until homogeneous to obtain the highly efficient bactericide and disinfectant for circulating water systems 3.

[0020] Example 4

[0021] The highly efficient bactericide and disinfectant for circulating water systems provided in this embodiment comprises the following components by mass percentage: 5% DBNPA, 60% polypropylene glycol, 30% water, and 5% potassium bromide. The preparation process is as follows: Polypropylene glycol is added to a reaction vessel, followed by DBNPA under ice bath conditions. After stirring until homogeneous, half the volume of deionized water is added, then potassium bromide is added and stirred for at least 5 minutes until completely dissolved. Hydrogen bromide is added to ensure the pH of the solution is within the range of 3-4. Finally, the remaining half of the water is added, and the mixture is stirred until homogeneous to obtain the highly efficient bactericide and disinfectant for circulating water systems 4.

[0022] Example 5

[0023] The highly efficient bactericide and disinfectant for circulating water systems provided in this embodiment comprises the following components by mass percentage: 15% DBNPA, 55% polypropylene glycol, 25% water, and 5% potassium bromide. The preparation process is as follows: Polypropylene glycol is added to a reaction vessel, followed by DBNPA under ice bath conditions. After stirring until homogeneous, half the volume of deionized water is added, then potassium bromide is added and stirred for at least 5 minutes until completely dissolved. Hydrogen bromide is added to ensure the pH of the solution is within the range of 3-4. Finally, the remaining half of the water is added, and the mixture is stirred until homogeneous to obtain the highly efficient bactericide and disinfectant for circulating water systems.

[0024] Example 6

[0025] The highly efficient bactericide and disinfectant for circulating water systems provided in this embodiment comprises the following components by mass percentage: 21% DBNPA, 50% polypropylene glycol, 25% water, and 4% potassium bromide. The preparation process is as follows: Polypropylene glycol is added to a reaction vessel, followed by DBNPA under ice bath conditions. After stirring until homogeneous, half the volume of deionized water is added, then potassium bromide is added and stirred for at least 5 minutes until completely dissolved. Hydrogen bromide is added to ensure the pH of the solution is within the range of 3-4. Finally, the remaining half of the water is added, and the mixture is stirred until homogeneous to obtain the highly efficient bactericide and disinfectant for circulating water systems 6.

[0026] Example 7

[0027] The highly efficient bactericide and disinfectant for circulating water systems provided in this embodiment comprises the following components by mass percentage: 20% DBNPA, 50% polypropylene glycol, 25% water, and 5% sodium bromide. The preparation process is as follows: Polypropylene glycol is added to a reaction vessel, followed by DBNPA under ice bath conditions. After stirring until homogeneous, half the volume of deionized water is added, then potassium bromide is added and stirred for at least 5 minutes until completely dissolved. Hydrogen bromide is added to ensure the pH of the solution is within the range of 3-4. Finally, the remaining half of the water is added, and the mixture is stirred until homogeneous to obtain the highly efficient bactericide and disinfectant for circulating water systems 7.

[0028] Example 8

[0029] The highly efficient bactericide and disinfectant for circulating water systems provided in this embodiment comprises the following components by mass percentage: 20% DBNPA, 50% 1,3-butanediol, 25% water, and 5% potassium bromide. The preparation process is as follows: Polypropylene glycol is added to a reaction vessel, followed by DBNPA under ice bath conditions. After stirring until homogeneous, half the volume of deionized water is added, then potassium bromide is added and stirred for at least 5 minutes until completely dissolved. Hydrogen bromide is added to ensure the pH of the solution is within the range of 3-4. Finally, the remaining half of the water is added, and the mixture is stirred until homogeneous to obtain the highly efficient bactericide and disinfectant for circulating water systems.

[0030] Experimental Example

[0031] The high-efficiency bactericides and disinfectants 1-8 for circulating water systems prepared in the above embodiments were packaged and placed in an open-air environment at room temperature. The content of DBNPA was detected by high-performance liquid chromatography at 0, 3, 6, 9, 12, 15 and 18 months, respectively. The measurement results are shown in Table 1.

[0032] Table 1. Test results of DBNPA content of high-efficiency bactericides 1-8 in circulating water systems.

[0033]

[0034] As shown in Table 1, the DBNPA retention of disinfectant 1 to 3 reached over 95% after 18 months, indicating that the specific ratio of polypropylene glycol to water (2:1) combined with specific bromides and a specific amount of DBNPA can effectively reduce the storage loss of DBNPA and improve its storage life.

[0035] The above embodiments are merely one of the preferred embodiments of the present invention and should not be used to limit the scope of protection of the present invention. Any modifications or refinements made to the main design concept and spirit of the present invention that are not of substantial significance, but solve the same technical problem as the present invention, should be included within the scope of protection of the present invention.

Claims

1. A highly efficient bactericide and disinfectant for circulating water systems, characterized in that, Its composition includes the following components by mass percentage: 10-20% DBNPA, 50-56% polypropylene glycol, 25-28% water, 4-5% potassium bromide, and 0.1-0.5% hydrogen bromide.

2. The highly efficient bactericide and disinfectant for circulating water systems as described in claim 1, characterized in that, The mass ratio of polypropylene glycol to water is 2:

1.

3. The preparation method of the highly efficient bactericide and disinfectant for circulating water systems as described in claim 1 or 2, characterized in that, The preparation process is as follows: Polypropylene glycol is added to the reaction vessel, DBNPA is added under ice bath conditions, and after stirring evenly, half of the deionized water is added, potassium bromide is added, and the mixture is stirred for more than 5 minutes until it is completely dissolved. Hydrogen bromide is added to ensure that the pH value of the solution is in the range of 3 to 4. Finally, the remaining half of the water is added, and the mixture is stirred evenly to obtain a highly efficient bactericide and disinfectant for circulating water systems.

4. The preparation method of the highly efficient bactericide and disinfectant for circulating water systems as described in claim 3, characterized in that, The temperature of the solution was controlled below 35℃ throughout the entire preparation process.

5. The preparation method of the highly efficient bactericide and disinfectant for circulating water systems as described in claim 3, characterized in that, Before adding DBNPA, place the system in an ice bath.

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