Amino acid surfactant-based industrial cleaning agent as well as preparation method and application thereof

Abstract

The invention discloses an amino acid surfactant-based industrial cleaning agent as well as a preparation method and application thereof, and belongs to the technical field of industrial cleaning agents. The amino acid surfactant-based industrial cleaning agent comprises the following components: amino acid surfactant mother liquor, a nonionic surfactant, polydimethylsiloxane, tetrasodium glutamate diacetate, sodium hexametaphosphate, benzotriazole, water and the like. Wherein the mass concentration of the amino acid surfactant in the amino acid surfactant mother liquor is 2-6%; the amino acid surfactant comprises at least one of cocoyl glycinate, cocoyl glutamate, lauroyl glutamate and lauroyl glycinate and cocoyl aspartate, and the cleaning agent is endowed with multiple effects of surface cleaning, stabilization, protection and the like through the synergistic effect of the components; the cleaning agent can be widely applied to surface cleaning of materials such as photovoltaic panels or metal.

Description

Technical Field

[0001] This invention relates to an industrial cleaning agent, particularly an amino acid surfactant-based industrial cleaning agent, and also to its preparation method and application in the cleaning of photovoltaic panels or metals, belonging to the field of industrial cleaning agent technology. Background Technology

[0002] Currently, the vast majority of surfactants used in industry are derived from petroleum and its cracking products. Some synthetic surfactants have been identified as non-biodegradable, irritating, and harmful to aquatic life. Their synthesis also carries the risk of residual carcinogens like dioxane, which contradicts the modern pursuit of green, environmentally friendly, and safe products. With increasingly stringent environmental regulations and growing public awareness of environmental protection, amino acid surfactants have attracted increasing attention as alternatives to petroleum-based surfactants.

[0003] Amino acid surfactants are widely used in many industrial applications due to their degradability, mildness, and safety, such as detergents, household cleaning products, cosmetics, and personal care products. They are used as cleaning agents, solubilizers, dispersants, stabilizers, emulsifiers, wetting agents, foaming agents, demulsifiers, and so on. As a new generation of green and natural raw materials for daily chemical products, amino acid surfactants have attracted much market attention. Currently, the amino acid groups in commonly used amino acid surfactants on the market are mainly sodium / potassium salts of sarcosine, glycine, alanine, glutamic acid, methyl taurine, etc., while the fatty acid groups attached to the amino acids are mainly lauroyl, cocoyl, myristoyl, palmitoyl, etc.

[0004] While amino acid surfactants are widely used in cosmetic-grade personal care products, their application in industrial cleaning products is still limited. The main reasons are twofold: firstly, amino acid surfactants have a relatively short history of application and have not yet been effectively developed for use in industrial cleaning products; secondly, amino acid surfactants are more expensive than traditional petroleum-based surfactants, making it difficult to meet the cost requirements of large-scale industrial production. Furthermore, in existing amino acid surfactant production processes, the crude product generally needs purification to meet cosmetic-grade standards. This purification process generates a significant amount of amino acid surfactant mother liquor. While this mother liquor contains a large amount of amino acid surfactant, it has imperfections in color and purity, making it unsuitable for personal care applications. Therefore, most of it is treated as waste, resulting in substantial waste and contradicting the principles of green development. Summary of the Invention

[0005] In view of the technical shortcomings of existing amino acid surfactants being rarely used in industrial cleaning and having high costs, the first objective of this invention is to provide an amino acid surfactant-based industrial cleaning agent that, through the synergistic effect between its components, endows it with multiple functions such as surface cleaning, stabilization, and protection, and can be widely used for surface cleaning of materials such as photovoltaic panels or metals.

[0006] The second objective of this invention is to provide a method for preparing an amino acid surfactant-based industrial cleaning agent. This method ingeniously uses amino acid surfactant mother liquor as raw material, which not only meets the application requirements of amino acid surfactant in industrial cleaning, but also solves the problem of subsequent treatment of amino acid surfactant mother liquor, achieving a dual balance between cost and environmental protection. Moreover, the preparation method is simple, mild, and low-cost, meeting the requirements of industrial production and achieving a win-win situation for upstream and downstream industries.

[0007] The third objective of this invention is to provide an application of an amino acid surfactant-based industrial cleaning agent, which, when used for cleaning surfaces such as photovoltaic panels or metals, not only exhibits a strong ability to clean stains, but also leaves no residue, has good stability, and provides protective effects, making it widely applicable.

[0008] To achieve the above-mentioned technical objectives, the present invention provides an amino acid surfactant-based industrial cleaning agent, comprising the following components by mass percentage: 1.0-15.0% amino acid surfactant stock solution; 0.5-3.0% nonionic surfactant; 0.05-0.4% polydimethylsiloxane; 0.05-0.3% tetrasodium diacetate of glutamic acid; 0.1-1.0% sodium hexametaphosphate; 0.1%-0.6% benzotriazole; and water, balance.

[0009] The mass concentration of the amino acid surfactant in the mother liquor is 2-6%;

[0010] The amino acid surfactant comprises at least one of cocoyl glycinate, cocoyl glutamate, lauroyl glutamate, lauroyl glycinate, and cocoyl aspartate.

[0011] The amino acid surfactant mother liquor of the present invention is the mother liquor generated during the crystallization, separation or centrifugation process of amino acid surfactant production. The composition of the mother liquor is relatively complex. The main component is amino acid surfactant, and it also contains salts (such as sodium chloride, potassium chloride, etc.), fatty acids (such as sodium laurate, sodium cocoate, etc.), amino acids, etc.

[0012] The key to the amino acid surfactant-based industrial cleaning agent of the present invention lies in the use of cocoyl aspartate salt in combination with other amino acid surfactants. The amino acid surfactant molecules mainly play a cleaning role. They disperse in water using their hydrophilic ends, while adsorbing onto oil and dirt on the substrate surface using their hydrophobic ends. This allows them to encapsulate oil and dirt to form micelles. When these micelles encapsulate oil and dirt, they detach from the substrate surface under external force (water rinsing, mechanical friction, etc.), thus achieving the peeling and removal of oil and dirt from the substrate surface without damaging the protective layer of the object surface. Introducing a small amount of cocoyl aspartate into amino acid surfactants, with its unique dicarboxylic hydrophilic ends, not only enhances the cleaning of oil and dirt but also exhibits stronger hydrophilicity compared to other amino acid surfactants. The dicarboxylic groups exposed on the outside of the micelles can adsorb onto the cleaned substrate surface through chelation bonds, while the tightly arranged, outward-facing hydrophobic ends form a micro-nano structure film on the surface, similar to the surface of a lotus leaf. This film is non-sticky, reducing the direct adhesion of subsequent water and oil, exhibiting a "hydrophobic and non-stick" lotus leaf effect. Therefore, the synergistic effect between sodium cocoyl aspartate and other amino acid surfactants can achieve highly efficient cleaning of oil and dirt from substrate surfaces while also providing surface protection.

[0013] The amino acid surfactant-based cleaning agent of this invention uses tetrasodium glutamate diacetate as a highly efficient chelating agent, combined with corrosion inhibitors sodium hexametaphosphate and benzotriazole. Its main function is to destroy the interference of metal ions on the cleaning system, improve cleaning efficiency and stability. Compared with disodium ethylenediaminetetraacetate commonly used in industry, it has better biodegradability and no bioaccumulation, and will not affect the ecology during use. At the same time, the chelating scale inhibition effect of sodium hexametaphosphate and the targeted corrosion inhibition effect of benzotriazole can form a synergy, avoiding damage to the metal matrix during cleaning, which is in line with the concept of green development.

[0014] The amino acid surfactant-based cleaning agent of the present invention utilizes nonionic surfactants and polydimethylsiloxane as auxiliary surfactants for amino acid surfactants. Its low-foaming and easy-rinse properties make it easy to rinse, save water and leave no residue.

[0015] As a preferred embodiment, the amino acid surfactant is composed of at least one of cocoyl glycinate, cocoyl glutamate, lauroyl glutamate, and lauroyl glycinate, and cocoyl aspartate in a mass ratio of 10-150:1-5. When the proportion of cocoyl aspartate is too low, it is difficult to form a uniform protective film on the surface of the cleaned object, thus failing to provide post-cleaning protection; conversely, when the proportion of cocoyl aspartate is too high, it reduces the stability of the cleaning agent system, thereby affecting its cleaning effect.

[0016] As a preferred embodiment, the amino acid surfactant is composed of at least one of cocoyl glycinate, cocoyl glutamate, lauroyl glutamate, and lauroyl glycinate, and cocoyl aspartate in a mass ratio of 50 to 150:3.

[0017] The amino acid surfactants involved in this invention are cocoyl glycinate, cocoyl glutamate, lauroyl glutamate, or lauroyl glycinate. These salts are common types of amino acid surfactants, such as sodium salts, potassium salts, and triethanolamine salts.

[0018] As a preferred embodiment, the nonionic surfactant includes at least one of AEO-9, AEO-7, and AEO-15. The most preferred nonionic surfactant is AEO-9.

[0019] As a preferred embodiment, the industrial cleaning agent includes a pH adjuster; the pH adjuster adjusts the system's pH to 10-12. Within this pH range, amino acid surfactants exhibit good foaming properties, strong cleaning effect, and good water solubility, eliminating the risk of precipitation. After cleaning, the surfactants can be quickly removed by rinsing with clean water, achieving water conservation. Examples of pH adjusters include sodium hydroxide and potassium hydroxide.

[0020] As a preferred embodiment, the industrial cleaning agent comprises the following components by mass percentage: 5.0-15.0% amino acid surfactant stock solution; 1.0-3.0% nonionic surfactant; 0.1-0.4% polydimethylsiloxane; 0.1-0.3% tetrasodium diacetate of glutamic acid; 0.5-1.0% sodium hexametaphosphate; 0.3%-0.6% benzotriazole; water, balance; the mass concentration of the amino acid surfactant in the amino acid surfactant stock solution is 2-6%; the amino acid surfactant is composed of at least one of cocoyl glycinate, cocoyl glutamate, lauroyl glutamate, and lauroyl glycinate and cocoyl aspartate in a mass ratio of 50-150:3.

[0021] This invention also provides a method for preparing an amino acid surfactant-based industrial cleaning agent. The method involves adding tetrasodium diacetate of glutamic acid to water, heating to 70-80°C and stirring to dissolve, then adding an amino acid surfactant mother liquor and a nonionic surfactant, maintaining the temperature, continuing to stir and dissolve, cooling to 40-45°C, then adding polydimethylsiloxane, sodium hexametaphosphate, and benzotriazole, continuing to stir and dissolve, then adding a pH adjuster to adjust the pH of the system to 10-12, cooling to below 40°C, and filtering to obtain the final product.

[0022] This invention also provides an application of an amino acid surfactant-based industrial cleaning agent for cleaning photovoltaic panels or metals.

[0023] Compared with existing technologies, the beneficial technical effects of the present invention are as follows:

[0024] 1) The amino acid surfactant-based industrial cleaning agent of the present invention has multiple functions such as high cleaning efficiency, good stability and protective properties.

[0025] 2) The amino acid surfactant-based industrial cleaning agent of the present invention uses amino acid surfactant mother liquor as raw material, realizing the resource utilization of industrial waste and reducing the cost of industrial cleaning agent.

[0026] 3) The amino acid surfactant-based industrial cleaning agent of the present invention has low preparation cost, high practicality, and is conducive to industrial production. Attached Figure Description

[0027] Figure 1 This is a comparison chart of the cleaning power of the amino acid surfactant-based industrial cleaning agents in Examples 1-3 and competing products.

[0028] Figure 2 This is a comparison chart of the cleaning power test results of the amino acid surfactant-based industrial cleaning agent in Example 1 and its competitors.

[0029] Figure 3 The graph shows a comparison of the metal corrosion resistance of the amino acid surfactant-based industrial cleaning agents in Examples 1-3 and competing products.

[0030] Figure 4 This is a comparison chart of the metal corrosion test results of the amino acid surfactant-based industrial cleaning agent in Example 1 and its competitors. Detailed Implementation

[0031] The following specific embodiments are intended to further illustrate the content of the present invention, rather than to limit the scope of protection of the claims.

[0032] The amino acid surfactant mother liquor in the following examples uses the crystallization mother liquor from the production process of sodium cocoyl glycinate, sodium cocoyl glutamate, sodium lauroyl glutamate, sodium lauroyl glycinate, and sodium cocoyl aspartate. The various crystallization mother liquors are mixed and used according to the required metering ratio of various amino acid surfactants. Taking sodium cocoyl glycinate mother liquor as an example, its main component is sodium cocoyl glycinate, accounting for 4% by mass, and it also contains a small amount of sodium chloride inorganic salt, sodium cocoate, glycine, etc.

[0033] Example 1

[0034] By weight (1 kg = 1 part), in 80 parts of water, first add 0.2 parts of tetrasodium diacetate of glutamic acid and heat to 75°C, stirring until dissolved. Then, add 8 parts of amino acid surfactant mother liquor (total concentration of amino acid surfactant is 4%, of which sodium cocoyl glycinate accounts for 60 wt%, sodium cocoyl aspartate accounts for 5 wt%, and sodium lauroyl glutamate accounts for 35 wt%) and stir until dissolved. Then, add 3 parts of fatty alcohol polyoxyethylene ether AEO-9 and stir until dissolved. Maintain the temperature and continue stirring until dissolved. Cool to 45°C, then add 0.3 parts of polydimethylsiloxane (raw material supplier: Linyi Lusen), 1 part of sodium hexametaphosphate, and 0.5 parts of benzotriazole and continue stirring until dissolved. Add 0.8 parts of potassium hydroxide, stir until dissolved, adjust the pH to 11, add the remaining water to make a total weight of 100 parts, cool to below 40°C, and filter out the material.

[0035] Example 2

[0036] By weight (1 kg = 1 part), in 80 parts of water, first add 0.2 parts of tetrasodium diacetate of glutamic acid and heat to 75°C, stirring until dissolved. Then, add 5 parts of amino acid surfactant stock solution (total concentration of amino acid surfactant is 4%, of which sodium lauroyl glycinate accounts for 65 wt%, sodium cocoyl glycinate accounts for 15%, sodium cocoyl glutamate accounts for 17 wt%, and sodium cocoyl aspartate accounts for 3 wt%) and stir until dissolved. Then, add 2 parts of fatty alcohol polyoxyethylene ether AEO-9 and stir until dissolved. Maintain the temperature and continue stirring until dissolved. Cool to 45°C, then add 0.3 parts of polydimethylsiloxane (raw material supplier: Linyi Lusen), 1 part of sodium hexametaphosphate, and 0.5 parts of benzotriazole and continue stirring until dissolved. Add 0.8 parts of potassium hydroxide, stir until dissolved, adjust the pH to 11, add the remaining water to make a total weight of 100 parts, cool to below 40°C, and filter out the material.

[0037] Example 3

[0038] By weight (1 kg = 1 part), in 80 parts of water, first add 0.2 parts of tetrasodium diacetate of glutamic acid and heat to 75°C, stirring until dissolved. Then, add 15 parts of amino acid surfactant stock solution (total concentration of amino acid surfactant is 5%, of which potassium cocoyl glycinate accounts for 77 wt%, sodium cocoyl glutamate accounts for 13 wt%, potassium lauroyl glycinate accounts for 6 wt%, and sodium cocoyl aspartate accounts for 4 wt%) and stir until dissolved. Then, add 1 part of fatty alcohol polyoxyethylene ether AEO-9 and stir until dissolved. Maintain the temperature and continue stirring until dissolved. Cool to 45°C, then add 0.3 parts of polydimethylsiloxane (raw material supplier: Linyi Lusen), 1 part of sodium hexametaphosphate, and 0.5 parts of benzotriazole and continue stirring until dissolved. Add 0.8 parts of potassium hydroxide, stir until dissolved, adjust the pH to 11, add the remaining water to make a total weight of 100 parts, cool to below 40°C, and filter out the material.

[0039] Example 4

[0040] By weight (1 kg = 1 part), in 80 parts of water, first add 0.2 parts of tetrasodium diacetate of glutamic acid and heat to 75°C, stirring until dissolved. Then, add 8 parts of amino acid surfactant stock solution (total concentration of amino acid surfactant is 4%, of which sodium cocoyl glycinate accounts for 62.5 wt%, sodium cocoyl aspartate accounts for 1 wt%, and sodium lauroyl glutamate accounts for 36.5 wt%) and stir until dissolved. Then, add 3 parts of fatty alcohol polyoxyethylene ether AEO-9 and stir until dissolved. Maintain the temperature and continue stirring until dissolved. Cool to 45°C, then add 0.3 parts of polydimethylsiloxane (raw material supplier: Linyi Lusen), 1 part of sodium hexametaphosphate, and 0.5 parts of benzotriazole and continue stirring until dissolved. Add 0.8 parts of potassium hydroxide, stir until dissolved, adjust the pH to 11, add the remaining water to make a total weight of 100 parts, cool to below 40°C, and filter out the material.

[0041] Example 5

[0042] By weight (1 kg = 1 part), in 80 parts of water, first add 0.2 parts of tetrasodium diacetate of glutamic acid and heat to 75°C, stirring until dissolved. Then, add 8 parts of amino acid surfactant mother liquor (total concentration of amino acid surfactant is 4%, of which sodium cocoyl glycinate accounts for 56.8 wt%, sodium cocoyl aspartate accounts for 10 wt%, and sodium lauroyl glutamate accounts for 33.2 wt%) and stir until dissolved. Then, add 3 parts of fatty alcohol polyoxyethylene ether AEO-9 and stir until dissolved. Maintain the temperature and continue stirring until dissolved. Cool to 45°C, then add 0.3 parts of polydimethylsiloxane (raw material supplier: Linyi Lusen), 1 part of sodium hexametaphosphate, and 0.5 parts of benzotriazole and continue stirring until dissolved. Add 0.8 parts of potassium hydroxide, stir until dissolved, adjust the pH to 11, add the remaining water to make a total weight of 100 parts, cool to below 40°C, and filter out the material.

[0043] The control group consisted of three commercially available glass curtain wall cleaning agents: Competitor A was JX-465 optical glass cleaner produced by Chaoqiangshi; Competitor B was photovoltaic glass curtain wall cleaner produced by BCL; and Competitor C was glass curtain wall cleaner produced by Tingxuan.

[0044] Physical performance testing:

[0045] Appearance and stability tests: Observe the changes in appearance and stability of the test sample and its 3% aqueous solution, and record the pH value of the 10% aqueous solution of the sample. The test results are shown in the table below.

[0046]

[0047] Note: pH test conditions are 10% aqueous solution, 25℃.

[0048] Cleaning power test:

[0049] Artificial oil stains were prepared and their cleaning power was tested according to the test methods in the national standard GB / T35759—2017 for metal cleaning agents. The results are as follows: Figure 1 .

[0050] Evaluation test of corrosion amount and appearance change of metal specimens:

[0051] Prepare four 50×25mm Z30I grade cast iron test pieces and four LY12 hard aluminum test pieces, respectively, and polish them to a bright shine with 240# sandpaper. First, wipe them clean with degreased gauze or degreased cotton, then immerse them in anhydrous ethanol, and use tweezers to hold the degreased gauze or degreased cotton for cleaning. Then, transfer the test pieces to acetone or petroleum ether for rinsing, blow them dry with hot water, cool them to room temperature in a desiccator, and weigh them. Prepare a 3% aqueous solution of the sample, take 300ml of the solution and put it into a 300ml beaker, then place the beaker in a water bath at (80±2)℃ to maintain the temperature of the cleaning solution at (80±2)℃. Vertically and completely immerse the weighed test pieces in the test solution, soak for 2 hours, and then remove the test pieces. Rinse with distilled water for 30 seconds, dehydrate in acetone or anhydrous ethanol, and blow them dry with hot air. Check the appearance.

[0052] After inspecting the appearance, the test piece was placed on a test piece rack, dried in an oven, and then cooled in a desiccator. The corrosion amount was then measured by weighing, and the results are as follows. Figure 2 , Figure 3 , Figure 4 And Table 2.

[0053]

Claims

1. An amino acid surfactant-based industrial cleaning agent, characterized in that: It contains the following components by weight percentage: Amino acid surfactant mother liquor: 1.0~15.0%; Nonionic surfactants: 0.5-3.0%; Polydimethylsiloxane 0.05~0.4%; Tetrasodium glutamate diacetate 0.05~0.3%; Sodium hexametaphosphate 0.1~1.0%; Benzotriazole 0.1%~0.6%; Water, remaining amount; The mass concentration of the amino acid surfactant in the mother liquor is 2-6%; the amino acid surfactant contains at least one of cocoyl glycinate, cocoyl glutamate, lauroyl glutamate, lauroyl glycinate and cocoyl aspartate.

2. The amino acid surfactant-based industrial cleaning agent according to claim 1, characterized in that: The amino acid surfactant is composed of at least one of cocoyl glycinate, cocoyl glutamate, lauroyl glutamate, and lauroyl glycinate, and cocoyl aspartate in a mass ratio of 10-150:1-5.

3. The amino acid surfactant-based industrial cleaning agent according to claim 2, characterized in that: The amino acid surfactant is composed of at least one of cocoyl glycinate, cocoyl glutamate, lauroyl glutamate, and lauroyl glycinate, and cocoyl aspartate in a mass ratio of 50 to 150:

3.

4. The amino acid surfactant-based industrial cleaning agent according to claim 1, characterized in that: The nonionic surfactant includes at least one of AEO-9, AEO-7, and AEO-15.

5. The amino acid surfactant-based industrial cleaning agent according to claim 1, characterized in that: It contains a pH adjuster; the pH adjuster is used to adjust the pH of the system to 10-12.

6. An amino acid surfactant-based industrial cleaning agent according to any one of claims 1 to 5, characterized in that: It contains the following components by weight percentage: Amino acid surfactant mother liquor 5.0~15.0%; Nonionic surfactants: 1.0~3.0%; Polydimethylsiloxane 0.1~0.4%; Tetrasodium glutamate diacetate 0.1-0.3%; Sodium hexametaphosphate 0.5~1.0%; Benzotriazole 0.3%~0.6%; Water, remaining amount; The mass concentration of the amino acid surfactant in the mother liquor is 2-6%; the amino acid surfactant is composed of at least one of cocoyl glycinate, cocoyl glutamate, lauroyl glutamate, and lauroyl glycinate with cocoyl aspartate in a mass ratio of 50-150:

3.

7. A method for preparing an amino acid surfactant-based industrial cleaning agent according to any one of claims 1 to 6, characterized in that: Add tetrasodium diacetate of glutamic acid to water, heat to 70-80℃ and stir to dissolve. Then add the amino acid surfactant stock solution and nonionic surfactant, maintain the temperature, and continue stirring to dissolve. After cooling to 40-45℃, add polydimethylsiloxane, sodium hexametaphosphate and benzotriazole, and continue stirring to dissolve. Then add a pH adjuster to adjust the pH of the system to 10-12, cool to below 40℃, and filter to obtain the final product.

8. The application of the amino acid surfactant-based industrial cleaning agent according to any one of claims 1 to 6, characterized in that: Used for cleaning photovoltaic panels or metals.

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