Environment-friendly acidic foam cleaning agent for food industrial equipment and preparation method of environment-friendly acidic foam cleaning agent

Abstract

The invention discloses an environment-friendly acidic foam cleaning agent for food industrial equipment and a preparation method of the environment-friendly acidic foam cleaning agent, and relates to the technical field of development of cleaning agents for food industries, the environment-friendly acidic foam cleaning agent is prepared from the following raw materials in parts by weight: 20-30 parts of nitric acid, 0.5-3 parts of nitrate, 3-7 parts of a foaming agent, 4-12 parts of a foam adhesive composition, 0.1-1 part of a corrosion inhibitor and 50-70 parts of deionized water; the foam adhesive composition is prepared by mixing and heating an emulsifier and an organic solvent. By compounding the dilute nitric acid, the nitrate and the corrosion inhibitor, the detergency and passivation capability of the stainless steel cleaning agent are improved, corrosion of pickling to 304 and 316 food-grade stainless steel equipment is avoided while the detergency is guaranteed, corrosion to 2-series stainless steel such as 201 stainless steel and 4-series stainless steel such as 440 stainless steel is reduced, the foaming agent compatible with nitric acid and screened for a long time is added, and the corrosion resistance of the stainless steel cleaning agent is improved. The covering force of the cleaning agent on the surface of the food industrial equipment is increased, so that the cleaning agent is more uniformly attached, cleaning dead angles are avoided, and the acid foam cleaning agent is good in stability and safety.

Description

Technical Field

[0001] The present invention relates to the technical field of development of cleaning agents for the food industry, and in particular to an environmentally friendly acidic foam cleaning agent for food industry equipment and a preparation method thereof. Background Art

[0002] With the development of the food processing industry and the animal husbandry industry, the market demand for cleaning agents has also increased. In order to meet the current market demand, an acidic foam cleaning agent is proposed here. This acidic foam cleaning agent can effectively remove rust, dirt, scale, milk stains, and beer stones remaining on various equipment.

[0003] Currently, most acidic foam cleaners on the market use phosphoric acid or citric acid as their primary cleaning ingredients. Phosphoric acid is a medium-strength inorganic acid. Because orthophosphates and monohydrogen phosphates are generally insoluble in water, phosphoric acid has a low etching ability. However, the outstanding advantage of phosphoric acid etching is that the small amount of solution remaining on the workpiece surface after etching can be transformed into an insoluble phosphate protective film, making it suitable for rust removal on welded steel parts before painting. For example, 2% phosphoric acid at 80°C can be used to remove rust from steel parts. Although phosphoric acid can reduce corrosion in food equipment, it is not very effective in cleaning various inorganic salt deposits. Low concentrations of phosphoric acid are less effective against inorganic scale, such as calcium carbonate, magnesium carbonate, and calcium sulfate, which are common in scale. High concentrations can also place a significant burden on wastewater treatment.

[0004] Citric acid is used to purify and remove iron and copper oxides in the cleaning of boilers, heaters, superheater pipes and heating stainless steel equipment, especially in places where chlorides are not allowed. However, the cleaning reaction temperature of the citric acid solution must be higher than 37.8°C. When it is lower than 37.8°C, the cleaning time will be greatly extended. At room temperature, it has poor detergency against common inorganic scales such as calcium carbonate, magnesium carbonate and calcium sulfate. Although the reaction rate will increase under high temperature conditions, it cannot completely remove the scale.

[0005] The dirt composition in the food industry is relatively complex, and inorganic scale is difficult to handle. The phosphoric acid and citric acid foam cleaners on the market cannot cope well with complex usage scenarios. In addition, the cost of using phosphoric acid and citric acid is high and the cleaning ability is limited. Therefore, in actual use, in view of the development of the food industry, there is a need for a more efficient, low-cost, environmentally friendly, foam-rich, wall-hanging, easy to rinse, low corrosion to equipment, and simple and safe to use acidic foam cleaner.

[0006] Regarding acidic foam cleaning agents, patent CN202110514459.3, a low-temperature foam cleaning agent for meat processing places and its preparation method, the method is as follows: The invention discloses a low-temperature foam cleaning agent, which is suitable for meat processing places. By using mild and safe citric acid as the main cleaning agent, the corrosion of stainless steel equipment by pickling is avoided; a small amount of nitric acid and acetic acid is added to increase the detergency, especially rust removal; a small amount of mild high-foaming surfactant and chelating agent are added, and the surfactant is a non-ionic surfactant and / or a cationic surfactant to increase the contact area between the cleaning agent and the dirt, prolong the residence time of the cleaning agent, and thus improve the cleaning efficiency, and finally prepare a high-foaming, mild, and good cleaning effect acidic foam cleaning agent.

[0007] Disadvantages: Experiments have shown that citric acid has poor detergency at room temperature, nitric acid has a low reaction rate with inorganic scale and rust at low content and has poor detergency, the combination of multiple weak acids and strong acids has little effect on the detergency of weak acids, and it is difficult to effectively remove dirt using weak acids as the main acid within the foam hanging time generated by surfactants, and cationic surfactants will combine with the reaction product sodium citrate to form high-molecular sticky scale that is difficult to clean.

[0008] The main components of popular acidic foam cleaners on the market are phosphoric acid, which has only moderate cleaning effects at low concentrations and significant environmental pollution at high concentrations. Citric acid, however, has poor detergency at room temperature and is primarily used for COP cleaning, leaving many blind spots. Incomplete cleaning can have a significant impact on food production. The shortcomings of existing technologies include high production and use costs, numerous restrictions on use, moderate cleaning effects, and high environmental pollution. Nitric acid is oxidizing and has poor compatibility with surfactants. Therefore, we propose an environmentally friendly acidic foam cleaner for food industry equipment and its preparation method. Summary of the Invention

[0009] In order to solve the above technical problems, an environmentally friendly acidic foam cleaning agent for food industry equipment is provided. This technical solution solves the problem that the above-mentioned dirt composition is relatively complex and inorganic scale is difficult to handle.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: an environmentally friendly acidic foam cleaning agent for food industry equipment, comprising the following raw materials in parts by weight: 20-30 parts of nitric acid, 0.5-3 parts of nitrate, 3-7 parts of foaming agent, 4-12 parts of foam adhesive composition, 0.1-1 part of corrosion inhibitor, and 50-70 parts of deionized water; the foam adhesive composition is produced by mixing and heating an emulsifier and an organic solvent.

[0011] Preferably, the foam adhesive composition is composed of the following raw materials in parts by weight: 1-3 parts of emulsifier and 3-9 parts of organic solvent.

[0012] Preferably, the preparation method of the foam adhesive composition is: adding the emulsifier into an organic solvent at 50°C-70°C in a ratio of 1:3, and stirring for 5 minutes.

[0013] Preferably, the emulsifier is either dodecanoic acid or tetradecanoic acid, or a mixture of any two of them in a ratio of 3:1 to 5:1.

[0014] Preferably, the organic solvent is any one of diethylene glycol monobutyl ether and diethylene glycol ethyl ether, or a mixture of the two in any proportion.

[0015] Preferably, the foaming agent is sodium α-olefin sulfonate or a mixture of sodium α-olefin sulfonate and sodium dodecyl diphenyl ether disulfonate in a ratio of 3:1 to 5:1.

[0016] Preferably, the corrosion inhibitor is hydroxyethylidene diphosphonic acid.

[0017] Preferably, the nitrate is any one of sodium nitrate and potassium nitrate or a mixture of the two.

[0018] A method for preparing an environmentally friendly acidic foam cleaning agent for food industry equipment comprises the following steps: adding a corrosion inhibitor and a nitrate into deionized water, stirring to dissolve them, then sequentially adding nitric acid, a foaming agent, and a foam adhesive composition, stirring for 20-40 minutes, and standing for 1 hour to obtain the environmentally friendly acidic foam cleaning agent for food industry equipment.

[0019] The invention discloses an application of an environmentally friendly acidic foam cleaning agent for food industry equipment. The acidic foam cleaning agent for food industry equipment is diluted to a mass concentration of 0.2%-0.5%, and the foam is evenly sprayed on the surface of food tools and industrial equipment using a foaming machine or a car washing machine.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the present invention increases the detergency and passivation capabilities by compounding dilute nitric acid, nitrates and corrosion inhibitors, thereby avoiding the corrosion of 304 and 316 food-grade stainless steel equipment caused by pickling while ensuring the detergency, and reducing the corrosion of 2 series stainless steels such as 201 stainless steel and 4 series stainless steels such as 440 stainless steel.

[0021] The addition of a nitric acid-compatible foaming agent, which has been screened over a long period of time, increases the coverage of the cleaning agent on the surface of food industry equipment, making it adhere more evenly and avoiding cleaning dead corners. The acidic foam cleaning agent also has good stability and safety.

[0022] The addition of a special foam adhesive composition formula greatly increases the residence time of the foam cleaning agent on the surface of food industry equipment, preventing the effective ingredients of the cleaning agent from flowing away and causing a decrease in the decontamination effect.

[0023] Using nitric acid as the main cleaning ingredient can greatly reduce the cost of production raw materials while ensuring that the detergency meets the standards, thereby reducing the cost of use for food factories.

[0024] The use of organic phosphine corrosion inhibitors is environmentally friendly and can prevent corrosion of production equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a diagram showing the initial foam wall adhesion phenomenon in Example 2 of the present invention; Figure 2 This is a diagram showing the foam clinging to the wall after 5 minutes in Example 2 of the present invention; Figure 3 This is a diagram of the initial foam wall adhesion phenomenon in Comparative Example 1 of the present invention; Figure 4 This is a diagram of the foam wall adhesion phenomenon after 5 minutes in comparative example 1 of the present invention. DETAILED DESCRIPTION

[0026] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0027] Example 1: An environmentally friendly acidic foam cleaning agent for food industry equipment is composed of the following raw materials in parts by weight: 20 parts nitric acid, 0.5 parts nitrate, 3 parts foaming agent, 4 parts foam adhesive composition, 0.1 parts corrosion inhibitor, and 70 parts deionized water; the foam adhesive composition is composed of the following raw materials in parts by weight: 1 part emulsifier, 3 parts organic solvent; the preparation method is to add the emulsifier to the organic solvent heated to 50°C-70°C and stir for 5 minutes.

[0028] The invention discloses a method for preparing an environmentally friendly acidic foam cleaning agent for food industry equipment, comprising the following steps: adding the corrosion inhibitor and the nitrate to deionized water, stirring to dissolve the deionized water, and then sequentially adding nitric acid, the foaming agent, and the foam adhesive composition, stirring for 20-40 minutes, and allowing the mixture to stand for 1 hour to obtain the environmentally friendly acidic foam cleaning agent for food industry equipment. The method further comprises the following steps: adding the corrosion inhibitor and the nitrate to deionized water, stirring to dissolve the deionized water, and then sequentially adding nitric acid, the foaming agent, and the foam adhesive composition, stirring for 20-40 minutes, and allowing the mixture to stand for 1 hour to obtain the environmentally friendly acidic foam cleaning agent for food industry equipment.

[0029] The invention discloses an application of an environmentally friendly acidic foam cleaning agent for food industry equipment. The acidic foam cleaning agent for food industry equipment is diluted to a mass concentration of 0.2%-0.5%, and the foam is evenly sprayed on the surface of food tools and industrial equipment using a foaming machine or a car washing machine.

[0030] Example 2: An environmentally friendly acidic foam cleaning agent for food industry equipment is composed of the following raw materials in parts by weight: 30 parts nitric acid, 3 parts nitrate, 7 parts foaming agent, 12 parts foam adhesive composition, 1 part corrosion inhibitor, and 50 parts deionized water; the foam adhesive composition is composed of the following raw materials in parts by weight: 3 parts emulsifier and 9 parts organic solvent; the preparation method is to add the emulsifier to the organic solvent heated to 50°C-70°C and stir for 5 minutes.

[0031] The foaming agent is a mixture of sodium α-olefin sulfonate and sodium dodecyl diphenyl ether disulfonate in a ratio of 3:1; the emulsifier is a mixture of dodecanoic acid and tetradecanoic acid in a ratio of 3:1; the organic solvent is diethylene glycol ethyl ether; the nitrate is sodium nitrate; the corrosion inhibitor is hydroxyethylidene diphosphonic acid; and the rest is the same as in Example 1.

[0032] Example 3: An environmentally friendly acidic foam cleaning agent for food industry equipment is composed of the following raw materials in parts by weight: 25 parts of nitric acid, 1.5 parts of nitrate, 5 parts of foaming agent, 8 parts of foam adhesive composition, 0.7 parts of corrosion inhibitor, and 60 parts of deionized water; the foam adhesive composition is composed of the following raw materials in parts by weight: 2 parts of emulsifier and 6 parts of organic solvent; the preparation method is to add the emulsifier to the organic solvent heated to 50°C-70°C and stir for 5 minutes.

[0033] The foaming agent is sodium α-olefin sulfonate; the emulsifier is dodecanoic acid; the organic solvent is a mixture of diethylene glycol monobutyl ether and diethylene glycol ethyl ether in a ratio of 1:1; the nitrate is potassium nitrate; the corrosion inhibitor is hydroxyethylidene diphosphonic acid; and the rest are the same as in Example 1.

[0034] Example 4: An environmentally friendly acidic foam cleaning agent for food industry equipment is composed of the following raw materials in parts by weight: 23 parts of nitric acid, 1 part of nitrate, 5 parts of foaming agent, 6 parts of foam adhesive composition, 0.5 part of corrosion inhibitor, and 50 parts of deionized water; the foam adhesive composition is composed of the following raw materials in parts by weight: 1.5 parts of emulsifier and 4.5 parts of organic solvent. The preparation method is to add the emulsifier to the organic solvent heated to 50°C-70°C and stir for 5 minutes.

[0035] The foaming agent is a mixture of sodium α-olefin sulfonate and sodium dodecyl diphenyl ether disulfonate in a ratio of 4:1; the emulsifier is tetradecanoic acid; the organic solvent is diethylene glycol ethyl ether; the nitrate is a mixture of sodium nitrate and potassium nitrate in a ratio of 1:1; the corrosion inhibitor is hydroxyethylidene diphosphonic acid; and the rest is the same as in Example 1.

[0036] Example 5: An environmentally friendly acidic foam cleaning agent for food industry equipment is composed of the following raw materials in parts by weight: 27 parts nitric acid, 2 parts nitrate, 6 parts foaming agent, 4 parts foam adhesive composition, 1 part corrosion inhibitor, and 60 parts deionized water; the foam adhesive composition is composed of the following raw materials in parts by weight: 1 part emulsifier, 3 parts organic solvent; the preparation method is to add the emulsifier to the organic solvent heated to 50°C-70°C and stir for 5 minutes.

[0037] The foaming agent is a mixture of sodium α-olefin sulfonate and sodium dodecyl diphenyl ether disulfonate in a ratio of 3:1; the emulsifier is dodecanoic acid; the organic solvent is diethylene glycol monobutyl ether; the nitrate is sodium nitrate; the corrosion inhibitor is hydroxyethylidene diphosphonic acid; and the rest is the same as in Example 1.

[0038] Comparative Example 1, an acidic foam cleaning agent, specifically: an acidic foam cleaning agent, composed of the following raw materials in parts by weight: 25 parts of citric acid, 5 parts of nitric acid, 5 parts of foaming agent, 0.5 parts of chelating agent, and 70 parts of deionized water; the foaming agent is nonylphenol polyoxyethylene ether; the chelating agent is sodium polyacrylate; a preparation method of the acidic foam cleaning agent, comprising adding citric acid, nitric acid, foaming agent, and chelating agent to deionized water in sequence, stirring to completely dissolve them, stirring for 30 minutes, and letting stand for 1 hour to obtain an acidic foam cleaning agent.

[0039] Comparative Example 2, an acidic foam cleaning agent, specifically: an acidic foam cleaning agent, composed of the following raw materials in parts by weight: 32 parts of phosphoric acid, 5 parts of foaming agent, 0.5 parts of chelating agent, 10 parts of solvent, and 70 parts of deionized water; the foaming agent is a mixture of dodecyl betaine surfactant and dodecyl amine oxide surfactant in a ratio of 1:1; the chelating agent is aminotrimethylene phosphonic acid; and the solvent is diethylene glycol butyl ether; a method for preparing the acidic foam cleaning agent, comprising adding dephosphoric acid, a foaming agent, a chelating agent, and a solvent to deionized water in sequence, stirring to completely dissolve them, stirring for 30 minutes, and letting them stand for 1 hour to obtain an acidic foam cleaning agent.

[0040] Performance Test Examples 1-5 Comparative Examples 1-2 The detergency is determined according to the method in Appendix A of "Acidic Cleaners for Food Tools and Industrial Equipment" (QB / T4313-2023). 40 g of the product is diluted 50 times and measured at 25°C.

[0041] The experimental results are shown in Table 1 Table 1 It can be seen from the data in Table 1 that under the same conditions, the detergency of the acidic foam cleaning agent with nitric acid as the main cleaning component is better than that of the acidic foam cleaning agent with citric acid and phosphoric acid as the main cleaning components.

[0042] The corrosion rate is determined according to the method in Appendix B of "Acidic Cleaners for Food Tools and Industrial Equipment" (QB / T4313-2023). 40 g of the product is diluted 50 times and measured at 25°C.

[0043] The experimental results are shown in Table 2 Table 2 As can be seen from the data in Table 2, under the same conditions, the corrosion rates of the acidic foam cleaning agents Examples 1-5 of the present invention using nitric acid as the main cleaning component and the acidic foam cleaning agents Comparative Examples 1 and 2 using citric acid and phosphoric acid as the main cleaning components on stainless steel all meet the standards.

[0044] Determination of foaming power and foam stability Experimental instruments: Roche foam meter, beaker, stopwatch, dropper and other necessary reagents; Experimental Method: At room temperature, place 20g of sample in a beaker, dilute to 1000g, and perform a foaming experiment using a Roche foam analyzer. After standing for observation, record the initial foam volume and the foam half-life using a stopwatch. The initial foam height indicates the foaming performance of the foaming agent, while the foam half-life measures the foam stability.

[0045] The experimental results are shown in Table 3 Table 3 As can be seen from the data in Table 3, the foaming power of the acidic foam cleaning agents prepared in Comparative Examples 1-5 increases with the increase of the foaming agent mass, and the foam stability increases with the increase of the foam adhesive composition. The test data of Comparative Examples 3, 4, Comparative Example 1 and Comparative Example 2 show that when the foaming amount is similar, the foam stabilization effect of the acidic foam cleaning agent will increase by about 1 / 3 after adding the foam adhesive composition.

[0046] Determination of foam wall adhesion ability: The cleaning agents prepared in Example 2, Comparative Example 1 and Comparative Example 2 were used as experimental objects. Samples were taken to prepare dilutions with a mass percentage concentration of 2%. The dilutions were foamed on the surface of a stainless steel plate under the same conditions using a special foaming device. The sliding state of the foam over time was observed. The sliding state of the foam on the stainless steel plate surface within 5 minutes was used to measure the strength of the cleaning agent foam wall adhesion. The experimental results are shown in the attached figure. At the beginning of the experiment, the foams of Example 2 and Comparative Example 1 evenly covered the surface of the steel plate. The foam of Example 2 was as follows: Figure 1 There is no sign of looseness and slippage, and the foam of Comparative Example 1 is as follows Figure 3 There were signs of foam loosening and sliding. When the experiment was carried out for 5 minutes, Example 2 was as follows. Figure 2 Still has strong wall hanging ability, the foam has no obvious downward trend, as shown in Example 1. Figure 4The foam drops significantly, which shows that the foam cleaning agent of the present invention has a strong wall-hanging ability, and the foam does not drop significantly within 1-5 minutes.

[0047] The above experimental results show that the environmentally friendly acidic foam cleaning agent for food industry equipment described in the present invention has high detergency, rich and stable foam, long half-life, strong wall adhesion ability, low production and use costs, and is environmentally safe. The cleaning agent is compounded with nitric acid, nitrate, foaming agent, foam adhesive composition, corrosion inhibitor, and deionized water in a certain proportion. The components work synergistically to enhance the cleaning ability of the acidic foam cleaning agent.

[0048] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly acidic foam cleaning agent for food industry equipment, characterized in that: The invention is composed of the following raw materials in parts by weight: 20-30 parts of nitric acid, 0.5-3 parts of nitrate, 3-7 parts of foaming agent, 4-12 parts of foam adhesive composition, 0.1-1 part of corrosion inhibitor and 50-70 parts of deionized water; the foam adhesive composition is produced by mixing and heating an emulsifier and an organic solvent.

2. The environmentally friendly acidic foam cleaning agent for food industry equipment according to claim 1, characterized in that: The foam adhesive composition is composed of the following raw materials in parts by weight: 1-3 parts of emulsifier and 3-9 parts of organic solvent.

3. The environmentally friendly acidic foam cleaning agent for food industry equipment according to claim 2, characterized in that: The preparation method of the foam adhesive composition is as follows: adding an emulsifier in a ratio of 1:3 to an organic solvent heated to 50° C.-70° C., and stirring for 5 minutes.

4. The environmentally friendly acidic foam cleaning agent for food industry equipment according to claim 2, characterized in that: The emulsifier is either dodecanoic acid or tetradecanoic acid, or any two of them are mixed in a ratio of 3:1 to 5:

1.

5. The environmentally friendly acidic foam cleaning agent for food industry equipment according to claim 2, characterized in that: The organic solvent is any one of diethylene glycol monobutyl ether and diethylene glycol ethyl ether, or a mixture of any two of them in any proportion.

6. The environmentally friendly acidic foam cleaning agent for food industry equipment according to claim 1, characterized in that: The foaming agent is sodium α-olefin sulfonate or a mixture of sodium α-olefin sulfonate and sodium dodecyl diphenyl ether disulfonate in a ratio of 3:1 to 5:

1.

7. The environmentally friendly acidic foam cleaning agent for food industry equipment according to claim 1, characterized in that: The corrosion inhibitor is hydroxyethylidene diphosphonic acid.

8. The environmentally friendly acidic foam cleaning agent for food industry equipment according to claim 1, characterized in that: The nitrate is any one of sodium nitrate and potassium nitrate or a mixture of the two.

9. A method for preparing an environmentally friendly acidic foam cleaning agent for food industry equipment, which is applied to the environmentally friendly acidic foam cleaning agent for food industry equipment according to any one of claims 1 to 8 above, characterized in that: The preparation steps are: A corrosion inhibitor and nitrate are added into deionized water and stirred to dissolve, and then nitric acid, a foaming agent and a foam adhesive composition are added in sequence, stirred for 20-40 minutes and allowed to stand for 1 hour to obtain an environmentally friendly acidic foam cleaning agent for food industry equipment.

10. An application of an environmentally friendly acidic foam cleaning agent for food industry equipment, characterized by: An environmentally friendly acidic foam cleaning agent for food industry equipment is diluted to a mass concentration of 0.2%-0.5%, and the foam is evenly sprayed on the surface of food tools and industrial equipment using a foaming machine or a car washing machine; the environmentally friendly acidic foam cleaning agent for food industry equipment is an environmentally friendly acidic foam cleaning agent for food industry equipment described in claim 1.

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