Deoiling and decontaminating low-foam cleaning agent for automatic pot washing machine and preparation method of cleaning agent

Abstract

The invention provides a deoiling and decontaminating low-foam cleaning agent for an automatic pot washing machine and a preparation method of the deoiling and decontaminating low-foam cleaning agent. The cleaning agent for the automatic pot washing machine comprises the following components in parts by mass: 4-10 parts of a low-foaming surfactant, 2-4 parts of a dispersing agent, 4-7 parts of a chelating agent, 3-10 parts of a buffering agent and the balance of deionized water, the low-foam surfactant has a hydrophobic part with relatively high rigidity and contains a siloxane skeleton, so that the formation of foam can be inhibited, and the stability of the foam can be inhibited; meanwhile, the cleaning agent has a claw-shaped long chain structure, so that small and unstable foam micelles can be formed, grease can be dissolved or emulsified into small oil drops easy to wash, the decontamination capability is improved, additional high-dosage addition of strong alkali is avoided, it is guaranteed that materials of the automatic pot washing machine are not strongly corroded during decontamination, and the development requirements for environmental protection, safety and mildness are met.

Description

Technical Field

[0001] This invention relates to the field of daily chemical cleaning technology, and in particular to a low-foaming automatic pot washing machine cleaner for removing oil and dirt, and its preparation method. Background Technology

[0002] With the continuous improvement of people's living standards and the popularization of health and environmental awareness, consumers have put forward higher requirements for daily cleaning products, especially in the field of tableware cleaning, which is closely related to food safety and family health. An ideal cleaning agent for automatic dishwashing machines should not only have highly efficient stain and grease removal capabilities, but also be low-foaming, easy to rinse, safe and friendly to skin and the machine, and environmentally friendly. However, existing cleaning agents for automatic dishwashing machines still have many shortcomings.

[0003] Most commercially available cleaning agents for automatic pot washers rely on highly alkaline components to achieve strong cleaning and degreasing effects. While these high-alkaline formulas can quickly break down grease, their alkalinity is usually too high, making them highly corrosive. This can easily damage the surface of the pot washer, especially stainless steel, aluminum, or coated surfaces, and may even irritate or burn the skin during the cleaning process, posing a safety hazard. Furthermore, if high-alkaline cleaning agents are not thoroughly rinsed after use, residues may remain on the surface of the pot washer, potentially posing a health risk if ingested, which does not meet current consumer demand for green and safe products.

[0004] On the other hand, while some low-alkaline or neutral-formulated detergents improve safety and gentleness, they often lack sufficient cleaning power, especially when dealing with heavily oiled dishwashing machines. This necessitates repeated use or more frequent washing, increasing both operating costs and user experience. Furthermore, many existing detergents for automatic dishwashing machines suffer from excessive foaming. Excessive foam not only prolongs rinsing time and increases water consumption but also hinders ease of use. For modern consumers seeking high efficiency and energy conservation, these products fall short of fully meeting their needs.

[0005] Therefore, developing a new type of cleaning agent for automatic pot washing machines that is low in alkalinity, low in foam, easy to rinse, and safe and environmentally friendly, while ensuring efficient stain and oil removal, has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] Purpose of the invention: The purpose of this invention is to develop a new type of cleaning agent for automatic pot washing machines that is low in alkalinity, low in foam, easy to rinse, safe and environmentally friendly, while achieving efficient stain removal and oil removal, thereby solving the above-mentioned technical problems.

[0007] The technical solution of the present invention: In a first aspect, the present invention provides a low-foaming cleaning agent for automatic pot washing machines that removes oil and dirt; based on 100 parts by weight, the cleaning agent for automatic pot washing machines includes 4-10 parts of low-foaming surfactant, 2-4 parts of dispersant, 4-7 parts of chelating agent, 3-10 parts of buffer, and the balance being deionized water.

[0008] In some embodiments, the method for preparing the low-foaming surfactant includes the following steps: Step 1: Add 3-chloropropyl-tris(trimethylsiloxy)silane and aniline to the reactor, heat the reaction, add alkali to neutralize the pH after the reaction is complete, and obtain product 1 through post-treatment; Step 2: Add trimethylolpropane triglycidyl ether and product 1 to the reactor, add catalyst, heat to carry out reaction, and after the reaction is completed, purify by silica gel column chromatography to obtain product 2; Step 3: Add product 2 to the reactor, along with succinic anhydride, catalyst, triethylamine and solvent. Stir the reaction at room temperature. After the reaction is complete, add a small amount of ethanol to quench the reaction. Post-process to obtain product 3. Step 4: Add deionized water to the mixing tank and adjust the pH to alkaline; dissolve product 3, add complexing agent, homogenize and mix, and spray dry to obtain low-foaming surfactant.

[0009] In some embodiments, the molar ratio of 3-chloropropyl-tris(trimethylsiloxy)silane and aniline in step 1 is 1:1.2; the heating reaction is carried out at 110-120°C for 24-48 hours; and the base is sodium methoxide.

[0010] In some embodiments, the molar ratio of trimethylolpropane triglycidyl ether to product 1 in step 2 is 1:3.1-3.3; the catalyst is LiBr; the reaction temperature of the heating reaction is 20-30°C, and the reaction time is 24-48h.

[0011] In some embodiments, the molar ratio of product 2 and succinic anhydride added in step 3 is 1:3.5-3.6; the catalyst is 4-dimethylaminopyridine; the solvent is a mixture of anhydrous DMF (N,N-dimethylformamide) and / or DCM (dichloromethane); the reaction temperature of the stirred reaction at room temperature is 20-25°C, and the reaction time is 4-12 h.

[0012] In some embodiments, the complexing agent in step 4 is one or more combinations of methylglycine diacetic acid, nitric acid triacetic acid, or disodium ethylenediaminetetraacetate; the weight ratio of the complexing agent to product 3 is 0.1-1:10-30.

[0013] In some embodiments, the alkalinity in step 4, adjusting the pH to alkalinity, is 9.5-10.5.

[0014] The resulting low-foaming surfactant also has a highly rigid hydrophobic portion (benzene ring) and a siloxane skeleton, which can inhibit foam formation and foam stability; at the same time, it has a claw-shaped long chain structure to form small and unstable foam micelles, which can dissolve grease or emulsify grease into easily rinsed small oil droplets, decompose oil stains, and make them easy to clean.

[0015] In some embodiments, the dispersant is selected from one or more combinations of low molecular weight sodium polyacrylate, acrylic acid / maleic acid copolymer, polyepigallic acid, and polyaspartic acid.

[0016] In some embodiments, the chelating agent is selected from one or more combinations of trisodium methylglycine diacetate, tetrasodium glutamate diacetate, and sodium gluconate.

[0017] In some embodiments, the buffer is selected from one or more combinations of sodium silicate, sodium metasilicate, potassium silicate, sodium citrate, tartrate, malate, potassium carbonate, and sodium bicarbonate.

[0018] In some embodiments, the pH of the cleaning agent for the low-foaming automatic pot washer is 9.2-10.3; further, the pH of the cleaning agent for the low-foaming automatic pot washer is 9.6-10.1.

[0019] In a second aspect, the present invention also provides a method for preparing the above-mentioned low-foaming automatic pot washing machine cleaner, which removes oil and dirt, specifically including the following steps: mixing the formulated amounts of low-foaming surfactant, dispersant, chelating agent, buffer, and deionized water evenly to obtain the automatic pot washing machine cleaner.

[0020] In some embodiments, the preparation method includes: The chelating agent and dispersant are stirred evenly in deionized water, a low-foaming surfactant is added, and then a buffer is added to adjust the pH. After standing and defoaming, the cleaning agent for the automatic pot washing machine is obtained.

[0021] Beneficial effects: 1. By using dual-function cleaning molecules, it avoids the need for additional high doses of strong alkalis or harmful additives, reducing environmental pollution and ensuring that cleaning will not severely corrode the materials of the automatic pot washing machine, which meets the requirements of green, environmentally friendly, safe and gentle development.

[0022] 2. The low-foaming surfactant developed has a larger spatial structure than ordinary small-molecule surfactants, which reduces its accumulation efficiency at the gas-liquid interface, thus naturally suppressing foam. The low-foaming surfactant also has a highly rigid hydrophobic part (benzene ring) and contains a siloxane skeleton, which can inhibit foam formation and foam stability. At the same time, it has a claw-shaped long chain structure to form small and unstable foam micelles, which can dissolve grease or emulsify grease into small oil droplets that are easy to rinse, decompose oil stains, and make them easy to clean. Detailed Implementation

[0023] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0024] Unless otherwise specified, all chemical reagents used in this invention are commercially available analytical grade. Trimethylolpropane triglycidyl ether was purchased from Aladdin Reagent Co., Ltd. (Aladdin) and was of analytical grade. Acrylic acid / maleic acid copolymer was purchased from Shandong Taihe Water Treatment Technology Co., Ltd.

[0025] Example of preparation of low-foaming surfactant 1 Step 1: Add 3 mol of 3-chloropropyl-tris(trimethylsiloxy)silane and 3.2 mol of aniline to the reactor, stir magnetically and heat to 120°C and reflux for 48 h. After the reaction is complete, add 2 mol of sodium methoxide to neutralize pH=7, and obtain product 1 by vacuum distillation. Step 2: Add 1 mol of trimethylolpropane triglycidyl ether and 3 mol of product 1 to the reactor, add 5 g of catalyst LiBr, heat at 30°C for 30 h under nitrogen protection, and purify by silica gel column chromatography after the reaction is completed, and remove the solvent by rotary evaporation to obtain product 2. Step 3: Add 1 mol of product 2 to the reactor, along with 3.6 mol of succinic anhydride, 0.2 mol of 4-dimethylaminopyridine, 3.2 mol of triethylamine and 50 ml of anhydrous DMF. Stir the reaction at room temperature (25°C) for 10 h. After the reaction is complete, add 1.5 mol of anhydrous methanol to quench the reaction. Obtain product 3 by rotary evaporation extraction. Step 4: Add 50ml of deionized water to the mixing tank and adjust the pH to 10 with NaOH solution; dissolve 30g of product 3, add 5g of methylglycine diacetic acid, mix homogenously, and spray dry to obtain low-foaming surfactant 1.

[0026] By compressing products 1 and 2 into tablets with KBr and performing infrared spectral analysis, the following results can be obtained: Product 1: 1100 cm -1Si-O-Si asymmetric stretching vibrations occur; 1270 cm⁻¹ -1 Si-CH3 vibration occurs; 1600 cm -1 Aromatic ring C-ring stretching vibrations occur; 3300cm -1 NH stretching was observed; it was confirmed that product 1 has a siloxane skeleton, NH is not completely substituted, it is still a secondary amine, and a benzene ring is grafted onto it.

[0027] Product 2: 3200cm -1 A broad and strong hydroxyl (OH) absorption is observed, significantly higher than that of product 1; 915 cm⁻¹ -1 The characteristic peak of epoxy disappears at 1100 cm⁻¹. -1 The Si-O-Si asymmetric stretching vibration is retained; alkyl CH (2950 cm⁻¹) -1 ) and aromatic rings (1600 cm) -1 It still exists; 3300cm -1 The NH stretching vibration disappeared. This confirmed that the main change in product 2 came from the ring-opening of the epoxy to form hydroxyl groups, and the siloxane groups were not destroyed.

[0028] Preparation Example of Low-Foaming Surfactant 2 The preparation method is basically the same as that of low-foaming surfactant 1, except that ethylamine is used instead of aniline in step 1.

[0029] Preparation Example of Low-Foaming Surfactant 3 Step 1: Add 1 mol of trimethylolpropane triglycidyl ether and 3 mol of aniline to the reactor, add 5 g of catalyst LiBr, heat at 30°C for 30 h under nitrogen protection, and purify by silica gel column chromatography after the reaction is completed, and remove the solvent by rotary evaporation to obtain product 1. Step 2: Add 1 mol of product 1 to the reactor, along with 3.6 mol of succinic anhydride, 0.2 mol of DMAP, 3.2 mol of triethylamine and 50 ml of anhydrous DMF. Stir the reaction at room temperature (25°C) for 10 h. After the reaction is complete, add 1.5 mol of anhydrous methanol to quench the reaction. Obtain product 2 by rotary evaporation extraction. Step 3: Add 50ml of deionized water to the mixing tank and adjust the pH to 10 with NaOH solution; dissolve 30g of product 3, add 5g of methylglycine diacetic acid, mix homogenously, and spray dry to obtain low-foaming surfactant 1.

[0030] Examples 1-3 Based on a total mass of 100 parts, according to the formula in Table 1, the chelating agent and dispersant are stirred evenly in deionized water, a low-foaming surfactant is added, and then a buffer is added to adjust the pH to 9.5. After standing and defoaming, the cleaning agent for the automatic pot washing machine is obtained.

[0031] Table 1. Formulations of Examples (parts by weight) Comparative Examples 1-3 Based on a total mass of 100 parts, according to the formula in Table 2, the chelating agent and dispersant are stirred evenly in deionized water, a low-foaming surfactant is added, and then a buffer is added to adjust the pH to 9.5. After standing and defoaming, the cleaning agent for the automatic pot washing machine is obtained.

[0032] Table 2 Comparative formulations (parts by mass) Comparative Example 4 Commercially available detergent: Lemon descaling gel C purchased from a supermarket.

[0033] The above-mentioned cleaning agents were tested as follows, and the test results are shown in Table 3: 1. Cleaning Ability Test: Weigh 200g of sample into a glass beaker according to QB / T 4348 and preheat in a water bath to (35±2)℃. Weigh the prepared steel sheet (304 stainless steel purchased from Foshan Tianyi Stainless Steel Co., Ltd., model: TY-113), clamp it on the washing rack of the washing machine, keeping it vertical. Six beakers are needed for each sample, with one sample suspended in each beaker. Use a stopwatch to time the time, allowing the oily part to be completely immersed for 10 minutes, followed by 5 minutes of washing. Then, rinse the sample beaker, pour 210mL of water at (35±2)℃ into each, and wash for 30 seconds. Remove the sample and place it on a tray, dry in a 120℃ oven for 45 minutes, then cool in a desiccator for 30 minutes before weighing. Calculate the weight of the steel sheet before coating (kitchen grease), the weight of the steel sheet after coating, and the weight of the steel sheet after cleaning. Calculate the weight difference of the grease before and after to obtain the degreasing rate.

[0034] 2. Corrosion test: The corrosion test was conducted according to section 5.6 of QB / T 2117-95 "General Water-based Metal Detergent". For each example, 150 mL of the stock solution was taken and placed in steel and hard aluminum test pieces. The solution temperature was heated in a water bath to 25±2℃ and soaked for 30 min. The corrosion amount of the test pieces was recorded. (The steel sheet was purchased from Foshan Tianyi Stainless Steel Co., Ltd., model: TY-113, and the hard aluminum sheet was purchased from Dongguan Shangye Metal Materials Co., Ltd., item number 58786259).

[0035] 3. Low-foaming test: According to GB / T 35759, pre-fill a dry graduated cylinder with 50 mL of cleaning agent, measure 200 mL of cleaning agent, and drop it freely from a fixed height of 90 cm through a dropper / faller tube to impact the surface of the test solution in the graduated cylinder, forming foam. Immediately after the drop ends, read the foam column height H0. Time 5 minutes from the end of the drop and read the foam height H5. Perform the experiment in triplicate and calculate the average value.

[0036] Table 3 Test Results The experimental data above show that the low-foaming automatic pot washer cleaner provided by this invention has excellent cleaning effect, with an oil removal rate of over 99%. The cleaner provided by this invention does not contain strong alkali; under the synergistic effect of its components, it not only has strong cleaning power, effectively removing various types of dirt from the surface of the automatic pot washer, but also has a much lower corrosiveness than the comparative example.

[0037] As can be seen from the comparison of Examples and Comparative Examples 4, 5, and 6, the spatial structure of low-foaming surfactants is larger than that of ordinary small-molecule surfactants, which reduces the stacking efficiency and thus naturally suppresses foam; the benzene ring and siloxane skeleton can inhibit foam formation and foam stability, and the long-chain structure can break down large-diameter foam into fine foam micelles, which is convenient for cleaning and defoaming.

[0038] This invention provides a cleaning agent for automatic pot washing machines that is low-foaming, easy to clean, has strong stain removal ability, and does not corrode tableware. It is green and environmentally friendly and represents a technological advancement.

[0039] This invention can also be implemented in various other ways. Without departing from the spirit and essence of this invention, those skilled in the art can make various corresponding changes and modifications according to this invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A low-foaming cleaning agent for automatic pot washing machines that removes oil and dirt, characterized in that, Based on a mass fraction of 100 parts, the cleaning agent for the automatic pot washing machine includes 4-10 parts of low-foaming surfactant, 2-4 parts of dispersant, 4-7 parts of chelating agent, 3-10 parts of buffer, and the remainder of deionized water.

2. The cleaning agent for the automatic pot washing machine according to claim 1, characterized in that, The preparation method of the low-foaming surfactant includes the following steps: Step 1: Add 3-chloropropyl-tris(trimethylsiloxy)silane and aniline to the reactor, heat the reaction, add alkali to neutralize the pH after the reaction is complete, and obtain product 1 through post-treatment; Step 2: Add trimethylolpropane triglycidyl ether and product 1 to the reactor, add catalyst, heat to carry out reaction, and after the reaction is completed, purify by silica gel column chromatography to obtain product 2; Step 3: Add product 2 to the reactor, along with succinic anhydride, catalyst, triethylamine and solvent. Stir the reaction at room temperature. After the reaction is complete, add a small amount of ethanol to quench the reaction. Post-process to obtain product 3. Step 4: Add deionized water to the mixing tank and adjust the pH to alkaline; dissolve product 3, add complexing agent, homogenize and mix, and spray dry to obtain low-foaming surfactant.

3. The cleaning agent for the automatic pot washing machine according to claim 2, characterized in that, In step 1, the molar ratio of 3-chloropropyl-tris(trimethylsiloxy)silane to aniline is 1:1.2; the heating reaction is carried out at 110-120°C for 24-48 hours; and the alkali is sodium methoxide.

4. The cleaning agent for an automatic pot washing machine according to claim 2, characterized in that, In step 2, the molar ratio of trimethylolpropane triglycidyl ether to product 1 is 1:3.1-3.3; the catalyst is LiBr; the reaction temperature of the heating reaction is 20-30℃, and the reaction time is 24-48h.

5. The cleaning agent for an automatic pot washing machine according to claim 2, characterized in that, In step 3, the molar ratio of product 2 to succinic anhydride is 1:3.5-3.6; the catalyst is 4-dimethylaminopyridine; the solvent is a mixture of anhydrous N,N-dimethylformamide and / or dichloromethane; the reaction temperature is 20-25℃ and the reaction time is 4-12h.

6. The cleaning agent for an automatic pot washing machine according to claim 2, characterized in that, The complexing agent mentioned in step 4 is one or more combinations of methylglycine diacetic acid, nitric acid triacetic acid, or disodium ethylenediaminetetraacetate; the weight ratio of the complexing agent to product 3 is 0.1-1:10-30.

7. The cleaning agent for an automatic pot washing machine according to claim 2, characterized in that, In step 4, the pH is adjusted to the alkalinity of 9.5-10.

5.

8. The cleaning agent for an automatic pot washing machine according to claim 1, characterized in that, The pH of the cleaning agent for the low-foaming automatic pot washer is 9.2-10.3; further, the pH of the cleaning agent for the low-foaming automatic pot washer is 9.6-10.

1.

9. The method for preparing the cleaning agent for the automatic pot washing machine according to any one of claims 1-8, characterized in that, The process involves uniformly mixing low-foaming surfactant, dispersant, chelating agent, buffer, and deionized water to obtain the cleaning agent for the automatic pot washing machine.

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