Preparation method of low-temperature-resistant radioactive decontamination barreled wet tissue

Abstract

The invention provides a preparation method of a low-temperature-resistant radioactive decontamination barreled wet tissue, and relates to the technical field of radioactive surface decontamination. The preparation method of the low-temperature-resistant radioactive decontamination barreled wet tissue comprises the following steps: firstly, preparing an anti-freezing radioactive decontamination agent, then soaking the anti-freezing radioactive decontamination agent on cloth, and then putting the cloth into a barrel in a roll, so as to obtain the low-temperature-resistant radioactive decontamination barreled wet tissue, the anti-freezing radioactive detergent is prepared from the following raw materials in parts by mass: 5 to 10 parts of organic acid, 2 to 8 parts of phosphonic acid compound, 0.2 to 0.8 part of polyethylene glycol, 10 to 20 parts of anti-freezing agent, 5 to 10 parts of chelating agent, 3 to 5 parts of octylphenol polyoxyethylene ether potassium phosphate and 100 parts of water. The decontamination wet tissue has the advantages of being small in size, light in weight, basically free of corrosion to metal and the like, the use method is simple, only the wet tissue needs to be taken out to wipe the contaminated surface, complex training and extra equipment support are not needed, the decontamination wet tissue is suitable for efficient radioactive decontamination operation in the low-temperature, narrow or limited-condition environment, and the decontamination effect is good. The method can also cope with emergency nuclear pollution events, and has a good industrial production prospect.

Description

Technical Field

[0001] The invention relates to the technical field of radioactive surface decontamination, and in particular to a method for preparing low-temperature resistant radioactive decontamination barreled wet wipes. Background Art

[0002] As the global demand for clean energy increases, nuclear energy, as a low-carbon and efficient energy source, is increasingly being used. The construction and operation of nuclear power plants, as well as the production and processing of nuclear fuels, are all subject to the risk of radioactive material leakage. Once a leak occurs, timely and efficient decontamination is required to ensure personnel safety and environmental protection. During the research and experimentation of radioactive materials, laboratory equipment, instruments, and work areas may be contaminated by radioactivity. In order to ensure the health of the experimenters and the safety of the experimental environment, these surfaces need to be decontaminated regularly. When nuclear facilities reach the end of their service life or need to be decommissioned for other reasons, they also need to be fully decontaminated and dismantled. This is a complex and lengthy process involving a large amount of radioactive surface decontamination work.

[0003] Existing radioactive surface decontamination technologies include laser decontamination technology, high-pressure water jet decontamination, chemical decontamination, ultrasonic decontamination, dry ice decontamination technology, etc. However, these methods generally have problems such as poor portability, complex operation, dependence on external conditions and equipment, and unsuitability for narrow or complex surfaces. Summary of the invention

[0004] In view of this, the present invention provides a method for preparing low-temperature resistant radioactive decontamination barreled wet wipes. Compared with traditional large-scale decontamination equipment and complex chemical decontamination solutions, the decontamination wet wipes of the present invention have the characteristics of small size, light weight, and basically no corrosion to metals. The method of use is simple, and only the wet wipes need to be taken out and the contaminated surface can be wiped. No complex training and additional equipment support are required. The method is suitable for carrying out efficient radioactive decontamination operations in low-temperature, narrow or restricted environments, and can also respond to emergency nuclear contamination incidents.

[0005] The preparation method of the low-temperature resistant radioactive decontamination barrel wet wipes of the present invention comprises the following steps:

[0006] Firstly, an antifreeze radioactive decontaminant is prepared, and then the antifreeze radioactive decontaminant is impregnated onto the cloth, and then the cloth is rolled and loaded into a drum;

[0007] The antifreeze radioactive detergent comprises the following raw materials in parts by mass: 5-10 parts of organic acid, 2-8 parts of phosphonic acid compounds, 0.2-0.8 parts of polyethylene glycol, 10-20 parts of antifreeze, 5-10 parts of chelating agent, 3-5 parts of octylphenol polyoxyethylene ether potassium phosphate, and 100 parts of water. More preferably, the antifreeze radioactive detergent comprises the following raw materials in parts by mass: 10 parts of organic acid, 5 parts of phosphonic acid compounds, 0.5 parts of polyethylene glycol, 15 parts of antifreeze, 10 parts of chelating agent, 4 parts of octylphenol polyoxyethylene ether potassium phosphate, and 100 parts of water.

[0008] Preferably, the organic acid is at least one of acetic acid, citric acid, lactic acid, oxalic acid, formic acid, succinic acid, malic acid, and aminosulfonic acid; the phosphonic acid compound is at least one of hydroxyethylidene diphosphonic acid, aminotrimethylene fork phosphonic acid, and hydroxyethylphosphonic acid; the antifreeze is an alcohol antifreeze; the chelating agent is at least one of diethylenetriamine pentaacetic acid pentasodium, ethylenediaminetetraacetic acid disodium, aminotriacetic acid, ethylenediaminetetraacetic acid trisodium, and tetrasodium succinate. More preferably, the organic acid is composed of aminosulfonic acid and citric acid in a mass ratio of 1:1, the phosphonic acid compound is hydroxyethylidene diphosphonic acid and / or aminotrimethylene fork phosphonic acid, the antifreeze is ethylene glycol and / or propylene glycol, and the chelating agent is at least one of diethylenetriamine pentaacetic acid pentasodium, ethylenediaminetetraacetic acid tetrasodium, and tetrasodium succinate.

[0009] Preferably, the antifreeze radioactive detergent further comprises 0.15 parts by mass of essence.

[0010] Preferably, the preparation method of the antifreeze radioactive detergent is as follows: organic acid, phosphonic acid compound, polyethylene glycol, antifreeze agent, chelating agent, octylphenol polyoxyethylene ether potassium phosphate are added into water one by one and mixed evenly.

[0011] Preferably, organic acid, phosphonic acid compound, polyethylene glycol, antifreeze agent, chelating agent, potassium octylphenol polyoxyethylene ether phosphate, and flavor are added to water one by one and mixed evenly.

[0012] Preferably, each raw material is stirred at room temperature for 15 to 60 minutes after being added, and the stirring speed is 260 to 420 r / min.

[0013] Preferably, the drum consists of a barrel body and a barrel cover, and the barrel cover is provided with a cross opening.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are:

[0015] The wet wipes of the present invention are small and light, simple to use, and low in preparation cost. They are easy to carry to various areas of nuclear facilities and are particularly suitable for decontamination operations in complex environments such as narrow passages inside reactors and gaps between laboratory instruments. At the same time, the wet wipes do not require complex training or additional equipment support when used. It is only necessary to take out the wet wipes and wipe the contaminated surface, which greatly improves the efficiency and convenience of decontamination work. The use of antifreeze in the wet wipes of the present invention ensures that the wet wipes remain liquid without freezing in a low-temperature environment, and can effectively perform a decontamination effect in cold areas or under low-temperature storage conditions. In addition, the reasonable ratio of the raw materials of the antifreeze radioactive decontaminant of the present invention not only ensures the excellent decontamination effect of the wet wipes, but also avoids waste of resources and the adverse effects that chemical components may have on the human body or equipment, ensuring that the wet wipes exhibit stable performance in various temperatures and complex environments.

[0016] The wet wipes of the present invention are packaged in a round barrel, and the cross opening of the barrel cover is convenient for taking out one by one, while effectively reducing the contact between the wet wipes and the outside air, reducing the risk of drying failure or contamination, and preventing waste caused by accidental removal of multiple wet wipes.

[0017] The invention ensures the stability of wet wipes performance by optimizing the detergent raw materials and the wet wipes production process, and meets the requirements of industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 Fabrics with different amounts of liquid;

[0020] Figure 2 Drums for wet wipes;

[0021] Figure 3 This is a diagram of the mechanism of action of wet wipes. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The present invention provides a method for preparing low-temperature resistant radioactive decontamination barrel wet wipes. Compared with traditional large-scale decontamination equipment and complex chemical decontamination solutions, the decontamination wet wipes of the present invention have the characteristics of small size and light weight. This allows them to be conveniently carried by staff to various areas of nuclear facilities, and even to some narrow spaces (such as narrow passages inside reactors, instrument gaps in laboratories, etc.) for decontamination operations. In addition, the low-temperature resistant radioactive decontamination barrel wet wipes of the present invention are simple to use. You only need to take out the wet wipes and wipe the contaminated surface, without the need for complex training and additional equipment support.

[0024] The preparation method of the low-temperature resistant radioactive decontamination barrel wet wipes of the present invention comprises the following steps:

[0025] Firstly, an antifreeze radioactive decontaminant is prepared, and then the antifreeze radioactive decontaminant is impregnated onto cloth, and then the cloth is rolled and packed into a drum.

[0026] The antifreeze radioactive detergent of the present invention comprises the following raw materials in parts by mass: 5-10 parts of organic acid, 2-8 parts of phosphonic acid compounds, 0.2-0.8 parts of polyethylene glycol, 10-20 parts of antifreeze agent, 5-10 parts of chelating agent, 3-5 parts of potassium octylphenol polyoxyethylene ether phosphate and 100 parts of water.

[0027] In some preferred embodiments of the present invention, the antifreeze radioactive detergent comprises the following raw materials, measured by mass: 10 parts of organic acid, 5 parts of phosphonic acid compound, 0.5 parts of polyethylene glycol, 15 parts of antifreeze agent, 10 parts of chelating agent, 4 parts of potassium octylphenol polyoxyethylene ether phosphate, and 100 parts of water.

[0028] The present invention limits the raw material composition and ratio of the detergent to ensure that the detergent can stably and efficiently react with the radioactive metal ions. When the wet wipes are used to wipe the radioactive contaminated surface, multiple coordinated atoms in the detergent will quickly form a stable ring-structured complex with the metal ions, so that the radioactive metal ions are separated from the surface of the contaminated object, and because the complex is relatively stable in the solution system of the wet wipes, it is fixed in the liquid environment inside the wet wipes, thereby achieving the purpose of removing radioactive contamination.

[0029] In some specific embodiments of the present invention, the organic acid is at least one of acetic acid, citric acid, lactic acid, oxalic acid, formic acid, succinic acid, malic acid, and aminosulfonic acid; the phosphonic acid compound is at least one of hydroxyethylidene diphosphonic acid, aminotrimethylene fork phosphonic acid, and hydroxyethylphosphonic acid; the antifreeze is an alcohol antifreeze; the chelating agent is at least one of diethylenetriamine pentaacetic acid pentasodium, ethylenediaminetetraacetic acid disodium, aminotriacetic acid, ethylenediaminetetraacetic acid trisodium, and tetrasodium succinate. In some more preferred embodiments of the present invention, the organic acid is composed of aminosulfonic acid and citric acid in a mass ratio of 1:1, the phosphonic acid compound is hydroxyethylidene diphosphonic acid and / or aminotrimethylene fork phosphonic acid, the antifreeze is ethylene glycol and / or propylene glycol, and the chelating agent is at least one of diethylenetriamine pentaacetic acid pentasodium, ethylenediaminetetraacetic acid tetrasodium, and tetrasodium succinate.

[0030] In some specific embodiments of the present invention, the antifreeze radioactive detergent further comprises 0.15 parts by weight of essence. In some preferred embodiments of the present invention, the essence is concentrated lemon essence.

[0031] The preparation method of the antifreeze radioactive detergent of the present invention is as follows: organic acid, phosphonic acid compound, polyethylene glycol, antifreeze agent, chelating agent and octylphenol polyoxyethylene ether potassium phosphate are added into water one by one and mixed evenly.

[0032] Another method for preparing the antifreeze radioactive detergent of the present invention is as follows: organic acid, phosphonic acid compound, polyethylene glycol, antifreeze agent, chelating agent, potassium octylphenol polyoxyethylene ether phosphate and essence are added to water one by one and mixed evenly.

[0033] In some preferred embodiments of the present invention, each raw material is stirred at room temperature for 15 to 60 minutes after being added, and the stirring speed is 260 to 420 r / min.

[0034] In the preparation of the antifreeze radioactive detergent of the present invention, each raw material preferably needs to be stirred at a certain speed for a period of time at room temperature after being added, mainly for the solubility of the raw materials, the stability of the product and the requirements of industrial operation, so as to better ensure that the detergent has good uniformity, performance stability and production efficiency.

[0035] First, different raw materials have different solubility and mixing uniformity in water. Full stirring helps to ensure the uniform distribution of each component in the solution and avoid the phenomenon of local concentration being too high or too low. Stirring time that is too short or rotation speed that is too low may cause some components to not be completely dissolved or dispersed, affecting the effect of the final detergent. Stirring time that is too long or rotation speed that is too high may increase energy consumption and even have an adverse effect on the stability of some components. In addition, some raw materials may undergo dissociation, chelation or other chemical reactions in water. Full stirring can provide sufficient time and dynamic conditions for these reactions to ensure that the system reaches chemical equilibrium. Stirring can also prevent the deposition of insoluble particles or the stratification of incompatible components, thereby ensuring the uniformity and stability of the detergent. Finally, the stirring conditions at room temperature are simple and easy to control, with a moderate rotation speed and time range, which is easy to implement in industrial production. This not only ensures the full mixing of the raw materials, but also avoids the increase in process costs and operability due to complex equipment or strict conditions.

[0036] In some specific embodiments of the present invention, the fabric is a spunlace nonwoven fabric, and the fabric is cut into specific specifications before use and then impregnated, and the amount of impregnation is 18 g / sheet.

[0037] The round barrel of the present invention is composed of a barrel body and a barrel cover, and the barrel cover is provided with a cross opening.

[0038] The wet wipes of the present invention are packaged in a drum, and the cross-opening design on the drum cover can form appropriate opening elasticity, so that the wet wipes can be extracted one by one, and at the same time, appropriate resistance is provided to the subsequent wet wipes to prevent too many wet wipes from being pulled out at the same time, which can avoid the waste caused by accidental removal of multiple wet wipes and the user does not need to open the entire drum cover, and can conveniently take them directly through the opening, thereby improving the use efficiency. In addition, compared with other larger opening designs (such as circular or rectangular direct openings), the cross-opening can more effectively reduce the contact between the wet wipes in the barrel and the outside air, reduce the possibility of the wet wipes drying, and prevent the dust of pollutants from entering the barrel, preventing the wet wipes from drying and failing, especially in low temperature or dry environments. Finally, the present invention provides a low-temperature resistant radioactive decontamination barrel wet wipes, and generally in low temperature and radiation environments, the staff needs to wear gloves for operation, and the cross-opening design provides elastic support, and the extraction can be completed without delicate operation, which reduces the risk of failure in production and use, reduces the complexity of operation, is convenient and quick to take, simplifies the difficulty of operation for the staff, and improves work efficiency.

[0039] The present invention does not strictly limit the specifications of the cross opening, so as to adapt to the specifications of the wet wipes and the barrel, and ensure that the wet wipes will not be too loose when passing through the opening, causing the wet wipes to slip out too much, nor will they be too tight, causing the wet wipes to be difficult to extract or damaged.

[0040] In order to further illustrate the present invention, the following examples are provided for detailed description. The raw materials used in the following examples of the present invention are all commercially available.

[0041] Example 1 A method for preparing a low-temperature resistant radioactive decontamination barrel wet wipes, the steps are as follows:

[0042] S1. Put 100g water into a container, add 10g organic acid (aminosulfonic acid: citric acid = 1:1) and stir at room temperature at 260r / min for 40min, add 5g hydroxyethylidene diphosphonic acid and stir at room temperature at 300r / min for 20min, add 0.5g PE g-200 and stirred at room temperature at 300r / min for 20min, 15g ethylene glycol was added and stirred at room temperature at 340r / min for 60min; 5g diethylenetriamine pentaacetic acid pentasodium was added and stirred at room temperature at 380r / min for 15min; 4g octylphenol polyoxyethylene ether phosphate potassium was added and stirred at room temperature at 420r / min for 15min, 2g tetrasodium ethylenediaminetetraacetate (EDTA-4Na) and 3g tetrasodium succinate were added and stirred at room temperature at 510r / min for 30min, 0.15g concentrated lemon essence was added and stirred at room temperature at 510r / min for 30min to obtain an antifreeze radioactive detergent;

[0043] S2, thickness is 0.59mm, weight is 55g / m 2 The fabrics with transverse breaking elongation of 66% and longitudinal breaking elongation of 33.6% were cut into small pieces of 20×30 cm, and then the antifreeze radioactive detergent obtained in S1 was impregnated into the cut fabrics. The impregnation amounts were 15 g / piece, 17 g / piece, 18 g / piece, 19 g / piece, and 20 g / piece, respectively. The impregnated fabrics were as follows: Figure 1 As shown;

[0044] Depend on Figure 1 It can be seen that when the amount of immersion liquid is 18g / piece, the liquid content of the wet wipes is the best, there is no liquid seepage and the immersion liquid is evenly saturated, so 18g / piece is selected as the immersion liquid amount;

[0045] S3. Roll the soaked cloth into a roll and put it into a drum (with a diameter of 220 mm and a height of 195 mm, and a 40 mm×40 mm cross opening on the drum cover), 100 sheets per drum.

[0046] Test Example 1

[0047] The radioactive contamination on the surface of the steel sheet was measured using CoMo170 (a handheld digital surface contamination measuring instrument). The measuring points were the four corners and the middle of the steel sheet, a total of 5 points, and each point was measured 6 times.

[0048] Then, the wet wipes prepared in Example 1 (with an immersion amount of 18 g / piece) were used to wipe the surface of the steel sheet back and forth 20 times with the same force, and then the radioactive contamination on the surface of the steel sheet was measured again using CoMo170 (a handheld digital surface contamination measuring instrument). The measuring points remained unchanged and each point was measured 6 times.

[0049] The decontamination rate was calculated according to formula (1) and the results are shown in Table 1.

[0050]

[0051] Where, DE: Decontamination efficiency of detergent, %; A0: Background before sample contamination, Bq / cm 2 ; A1 is the surface contamination of the contaminated sample without background deduction, Bq / cm 2 ; A2 is the surface contamination of the decontaminated sample without background deduction, Bq / cm 2 .

[0052] Table 1 Decontamination effect test results

[0053]

[0054]

[0055] The antifreeze property of the wet wipes was tested, and the results showed that the wet wipes prepared in this example froze at -20°C.

[0056] Comparative Example 1

[0057] Same as Example 1, except that potassium octylphenol polyoxyethylene ether phosphate was not used and the amount of immersion liquid was 18 g / block.

[0058] The decontamination effect and low temperature resistance of the wet wipes were tested in the same manner as in Test Example 1. After testing, the decontamination rate of the wet wipes prepared in this comparative example was 82.5%, and they froze at 18°C.

[0059] Comparative Example 2

[0060] Same as Example 1, except that the dosage of potassium octylphenol polyoxyethylene ether phosphate is 1 g, and the amount of immersion liquid is 18 g / block.

[0061] The decontamination effect and low temperature resistance of the wet wipes were tested in the same manner as in Test Example 1. After testing, the decontamination rate of the wet wipes prepared in this comparative example was 85.7%, and they froze at 19°C.

[0062] Comparative Example 3

[0063] Same as Example 1, except that the dosage of potassium octylphenol polyoxyethylene ether phosphate is 7 g, and the amount of immersion liquid is 18 g / block.

[0064] The decontamination effect and low temperature resistance of the wet wipes were tested in the same manner as in Test Example 1. After testing, the decontamination rate of the wet wipes prepared in this comparative example was 98.2%, and ice formed at 20°C. Studies have shown that with the increase in the amount of octylphenol polyoxyethylene ether potassium phosphate, the decontamination rate of the wet wipes began to show a downward trend (p>0.05), so whether from the cost aspect or the effect aspect, the amount of octylphenol polyoxyethylene ether potassium phosphate should not be too high.

[0065] Comparative Example 4

[0066] Same as Example 1, except that the organic acid is 10 g of aminosulfonic acid.

[0067] The decontamination effect and low temperature resistance of the wet wipes were tested in the same manner as in Test Example 1. After testing, the decontamination rate of the wet wipes prepared in this comparative example was 90.5%, and they froze at 18°C.

[0068] Comparative Example 5

[0069] Same as Example 1, except that the organic acid is 10 g of citric acid.

[0070] The decontamination effect and low temperature resistance of the wet wipes were tested in the same manner as in Test Example 1. After testing, the decontamination rate of the wet wipes prepared in this comparative example was 87.4%, and they froze at 20°C.

[0071] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing low-temperature resistant radioactive decontamination barrel wet wipes, characterized in that: The following steps are involved: Firstly, an antifreeze radioactive decontaminant is prepared, and then the antifreeze radioactive decontaminant is impregnated onto the cloth, and then the cloth is rolled and loaded into a drum; The antifreeze radioactive detergent comprises the following raw materials in parts by mass: 5-10 parts of organic acid, 2-8 parts of phosphonic acid compounds, 0.2-0.8 parts of polyethylene glycol, 10-20 parts of antifreeze agent, 5-10 parts of chelating agent, 3-5 parts of potassium octylphenol polyoxyethylene ether phosphate, and 100 parts of water.

2. The preparation method according to claim 1, characterized in that: The antifreeze radioactive detergent comprises the following raw materials in parts by mass: 10 parts of organic acid, 5 parts of phosphonic acid compound, 0.5 parts of polyethylene glycol, 15 parts of antifreeze agent, 10 parts of chelating agent, 4 parts of potassium octylphenol polyoxyethylene ether phosphate, and 100 parts of water.

3. The preparation method according to claim 1, characterized in that: The organic acid is at least one of acetic acid, citric acid, lactic acid, oxalic acid, formic acid, succinic acid, malic acid, and aminosulfonic acid.

4. The preparation method according to claim 3, characterized in that: The organic acid is composed of aminosulfonic acid and citric acid in a mass ratio of 1:

1.

5. The preparation method according to claim 1, characterized in that: The phosphonic acid compound is at least one of hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid and hydroxyethyl phosphonic acid.

6. The preparation method according to claim 1, characterized in that: The antifreeze is an alcohol antifreeze.

7. The chelating agent is at least one of pentasodium diethylenetriaminepentaacetate, disodium ethylenediaminetetraacetate, aminotriacetic acid, trisodium ethylenediaminetetraacetate, and tetrasodium succinate.

8. The preparation method according to claim 1, characterized in that: The preparation method of the antifreeze radioactive detergent is as follows: organic acid, phosphonic acid compound, polyethylene glycol, antifreeze agent, chelating agent and octylphenol polyoxyethylene ether potassium phosphate are added into water one by one and mixed evenly.

9. The preparation method according to claim 8, characterized in that: After each raw material is added, it is stirred at room temperature for 15 to 60 minutes, and the stirring speed is 260 to 420 r / min.

10. The preparation method according to claim 1, characterized in that: The round barrel is composed of a barrel body and a barrel cover, and the barrel cover is provided with a cross opening.

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