Washing machine drum cleaner, preparation method therefor and use thereof

Abstract

A washing machine drum cleaner, a preparation method therefor, and a use thereof. The washing machine drum cleaner comprises the following components by mass percentage: peroxide, 30%-50%; inorganic base, 3%-10%; buffering base, 15%-20%; sodium lauryl sulfate, 1%-5%; protease, 1%-5%; and the remainder being anhydrous sodium sulfate. The inorganic base is potassium hydroxide and / or sodium hydroxide, the buffering base is sodium carbonate and / or sodium bicarbonate, and the peroxide is sodium percarbonate and / or sodium perborate.

Description

A washing machine tank cleaner and its preparation method and application TECHNICAL FIELD

[0001] The present application belongs to the technical field of synthetic detergent. More particularly, it relates to a washing machine tank cleaner and its preparation method and application. BACKGROUND

[0002] With the increasing improvement of people's living standards, washing machines, as the main appliance for cleaning fabrics, have become quite popular in modern families. However, after using a washing machine for a period of time, the fungi and bacteria in the washing machine tank may spread to the environment, causing harm to human health, and a large amount of dirt (such as scale, fungi, bacteria, etc.) and hair may adhere to the inner tank. If these dirt and hair are not cleaned in time, they will adhere to the surface of the cleaned fabric along with the water flow when the washing machine is used to clean the fabric, causing secondary pollution of the fabric.

[0003] Currently, there are two common ways to clean the washing machine tank. One is to disassemble the washing machine tank and clean it by a professional maintenance worker, but this way is relatively high in cost and troublesome. The other is to use a washing machine tank cleaner for cleaning, which is relatively low in cost and simple and convenient to operate. However, the existing washing machine tank cleaners mainly have the function of inhibiting bacteria, and it is difficult to effectively remove dirt, especially hair, that is, the cleaning effect of the washing machine tank is still limited.

[0004] Therefore, it is urgent to find a washing machine cleaner that can not only inhibit bacteria but also effectively remove hair and dirt. SUMMARY

[0005] The present application aims to provide a washing machine tank cleaner that not only effectively inhibits bacteria but also effectively removes dirt, and even for the most difficult hair to remove, it can achieve a dissolution rate of more than 99%, having excellent cleaning effect.

[0006] The first object of the present application is to provide a washing machine tank cleaner.

[0007] The second object of the present application is to provide the application of the above-mentioned washing machine tank cleaner in cleaning the washing machine tank.

[0008] The third object of the present application is to provide a preparation method of the above-mentioned washing machine tank cleaner.

[0009] The fourth object of the present application is to provide a method for cleaning the washing machine tank.

[0010] The above objects of the present application are achieved by the following technical solutions:

[0011] The application provides a washing machine tank cleaner, which comprises the following components in mass percentage: 30-50% of peroxide, 3-10% of inorganic alkali, 15-20% of buffer alkali, 1-5% of sodium dodecyl sulfate (K12), 1-5% of protease, and the rest of anhydrous sodium sulfate.

[0012] The inorganic alkali is potassium hydroxide and / or sodium hydroxide, the buffer alkali is sodium carbonate and / or sodium bicarbonate, and the peroxide is sodium percarbonate and / or sodium perborate.

[0013] The washing machine tank cleaner has synergistic effects in terms of dirt removal, hair dissolution and bacterium inhibition in the system of specific peroxide, specific inorganic alkali and specific buffer alkali, and the dirt removal, hair dissolution and bacterium inhibition effects of the washing machine tank cleaner are obviously more excellent than those of washing machine tank cleaners using other inorganic alkalis or other buffer alkalis.

[0014] Preferably, the washing machine tank cleaner comprises the following components in mass percentage: 45-50% of peroxide, 5-9% of inorganic alkali, 15-20% of buffer alkali, 4-5% of sodium dodecyl sulfate and 4-5% of protease, and the rest of anhydrous sodium sulfate.

[0015] Further preferably, the washing machine tank cleaner comprises the following components in mass percentage: 50% of peroxide, 5% of inorganic alkali, 20% of buffer alkali, 5% of sodium dodecyl sulfate and 5% of protease, and the rest of anhydrous sodium sulfate.

[0016] Preferably, the peroxide is sodium percarbonate.

[0017] Preferably, the inorganic alkali is potassium hydroxide.

[0018] Preferably, the buffer alkali is sodium carbonate.

[0019] Preferably, the protease is alkaline protease, such as Savinase ultra 16XL, Progress Uno 100L and the like, and most preferably, the protease is Savinase ultra 16XL.

[0020] The washing machine tank cleaner can not only effectively inhibit bacteria, but also effectively remove dirt, and even for the hair with the highest removal difficulty, the dissolution rate can reach more than 99%, and the washing machine tank has excellent cleaning effect. Therefore, the application of the washing machine tank cleaner in cleaning the washing machine tank should be within the protection scope of the application.

[0021] The application further provides a preparation method of the washing machine tank cleaner, which comprises the following steps:

[0022] S1. mixing peroxide, inorganic alkali, buffer alkali and anhydrous sodium sulfate;

[0023] S2. Add sodium dodecyl sulfate and protease into the mixture of S1, mix well to obtain the laundry tub cleaner.

[0024] Based on the above, the application further provides a method for cleaning the tub of a washing machine, which comprises pouring the laundry tub cleaner into the drum of the washing machine and starting the washing machine.

[0025] The application has the following beneficial effects:

[0026] 1. The laundry tub cleaner of the application plays a synergistic effect in the system of specific peroxide, the specific inorganic alkali and the specific buffer alkali in terms of dirt removal, hair dissolution and bacteriostasis, and the dirt removal, hair dissolution and bacteriostasis effect of the laundry tub cleaner of the application is obviously more excellent compared with the laundry tub cleaners using other inorganic alkalis or other buffer alkalis.

[0027] 2. The laundry tub cleaner of the application has low cost, is convenient to use, consumes less time, does not need professional personnel, can be used in large quantities for cleaning private washing machines or public washing machines, and meets the efficient cleaning demand of people for the commonly used washing machine. DETAILED DESCRIPTION

[0028] The application will be further described below in combination with specific examples, but the examples do not limit the application in any form. Unless otherwise specified, the reagents, methods and equipment used in the application are conventional reagents, methods and equipment in the technical field.

[0029] Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0030] Example 1: Preparation of a laundry tub cleaner

[0031] I. Components of the laundry tub cleaner

[0032] As shown in Table 1, the laundry tub cleaner of the present embodiment comprises the following components in the following mass percentages: sodium percarbonate 50%, potassium hydroxide 5%, sodium carbonate 20%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 5%, and the balance is anhydrous sodium sulfate.

[0033] II. Preparation method of the laundry tub cleaner

[0034] S1. Mix sodium percarbonate, potassium hydroxide, sodium carbonate and anhydrous sodium sulfate well;

[0035] S2. Add sodium dodecyl sulfate and protease Savinase ultra 16XL into the mixture of S1, mix well to obtain the laundry tub cleaner.

[0036] Example 2: Preparation of a laundry tub cleaner

[0037] I. Components of the washing machine tank cleaner

[0038] As shown in Table 1, the washing machine tank cleaner of the present embodiment comprises the following components in mass percentage: sodium percarbonate 45%, potassium hydroxide 9%, sodium carbonate 20%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 4%, and the balance is anhydrous sodium sulfate.

[0039] II. Preparation method of the washing machine tank cleaner

[0040] S1. Mix sodium percarbonate, potassium hydroxide, sodium carbonate, and anhydrous sodium sulfate uniformly;

[0041] S2. Add sodium dodecyl sulfate and protease Savinase ultra 16XL to the mixture of S1, mix uniformly to obtain.

[0042] Preparation of a washing machine tank cleaner

[0043] I. Components of the washing machine tank cleaner

[0044] As shown in Table 1, the washing machine tank cleaner of the present embodiment comprises the following components in mass percentage: sodium percarbonate 45%, potassium hydroxide 9%, sodium carbonate 20%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 4%, and the balance is anhydrous sodium sulfate.

[0045] II. Preparation method of the washing machine tank cleaner

[0046] S1. Mix sodium percarbonate, potassium hydroxide, sodium carbonate, and anhydrous sodium sulfate uniformly;

[0047] S2. Add sodium dodecyl sulfate and protease Savinase ultra 16XL to the mixture of S1, mix uniformly to obtain.

[0048] Preparation of a washing machine tank cleaner

[0049] I. Components of the washing machine tank cleaner

[0050] As shown in Table 1, the washing machine tank cleaner of the present embodiment comprises the following components in mass percentage: sodium percarbonate 45%, potassium hydroxide 9%, sodium carbonate 20%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 4%, and the balance is anhydrous sodium sulfate.

[0051] II. Preparation method of the washing machine tank cleaner

[0052] S1. Mix sodium percarbonate, potassium hydroxide, sodium carbonate, and anhydrous sodium sulfate uniformly;

[0053] S2. Add sodium dodecyl sulfate, protease Savinase ultra 16XL into S1 mixture, mix well to obtain.

[0054] Example 5 Preparation of a washing machine tank cleaner

[0055] I. Components of the washing machine tank cleaner

[0056] As shown in Table 1, the washing machine tank cleaner of the present example comprises the following components in mass percentage: sodium percarbonate 50%, potassium hydroxide 3%, sodium carbonate 15%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 5%, and the balance is anhydrous sodium sulfate.

[0057] II. Preparation method of the washing machine tank cleaner

[0058] S1. Mix sodium percarbonate, potassium hydroxide, sodium carbonate, and anhydrous sodium sulfate well;

[0059] S2. Add sodium dodecyl sulfate, protease Savinase ultra 16XL into S1 mixture, mix well to obtain.

[0060] Example 6 Preparation of a washing machine tank cleaner

[0061] I. Components of the washing machine tank cleaner

[0062] As shown in Table 1, the washing machine tank cleaner of the present example comprises the following components in mass percentage: sodium percarbonate 50%, sodium hydroxide 5%, sodium bicarbonate 20%, sodium dodecyl sulfate 5%, protease Progress Uno 100L 5%, and the balance is anhydrous sodium sulfate.

[0063] II. Preparation method of the washing machine tank cleaner

[0064] S1. Mix sodium percarbonate, sodium hydroxide, sodium bicarbonate, and anhydrous sodium sulfate well;

[0065] S2. Add sodium dodecyl sulfate, protease Progress Uno 100L into S1 mixture, mix well to obtain.

[0066] Example 7 Preparation of a washing machine tank cleaner

[0067] I. Components of the washing machine tank cleaner

[0068] As shown in Table 1, the washing machine tank cleaner of the present example comprises the following components in mass percentage: sodium percarbonate 50%, sodium hydroxide 5%, sodium bicarbonate 20%, sodium dodecyl sulfate 5%, protease Progress Uno 100L 5%, and the balance is anhydrous sodium sulfate.

[0069] II. Method for preparing a washing machine tub cleaner

[0070] S1. Mix sodium percarbonate, potassium hydroxide, sodium carbonate, anhydrous sodium sulfate uniformly;

[0071] S2. Add sodium dodecyl sulfate, protease Savinase ultra 16XL into the mixture of S1, mix uniformly to obtain.

[0072] Preparation of a washing machine tub cleaner

[0073] I. Components of a washing machine tub cleaner

[0074] The same as Example 1, except that potassium hydroxide is replaced by monoethanolamine, i.e. the washing machine tub cleaner of the present comparative example contains the following components in mass percentage: sodium percarbonate 50%, monoethanolamine 5%, sodium carbonate 20%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 5%, and the rest is anhydrous sodium sulfate, as shown in Table 1.

[0075] II. Method for preparing a washing machine tub cleaner

[0076] S1. Mix sodium percarbonate, monoethanolamine, sodium carbonate, anhydrous sodium sulfate uniformly;

[0077] S2. Add sodium dodecyl sulfate, protease Savinase ultra 16XL into the mixture of S1, mix uniformly to obtain.

[0078] Preparation of a washing machine tub cleaner

[0079] I. Components of a washing machine tub cleaner

[0080] The same as Example 1, except that potassium hydroxide is replaced by monoethanolamine, i.e. the washing machine tub cleaner of the present comparative example contains the following components in mass percentage: sodium percarbonate 50%, monoethanolamine 5%, sodium carbonate 20%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 5%, and the rest is anhydrous sodium sulfate, as shown in Table 1.

[0081] II. Method for preparing a washing machine tub cleaner

[0082] S1. Mix sodium percarbonate, monoethanolamine, sodium carbonate, anhydrous sodium sulfate uniformly;

[0083] S2. Add sodium dodecyl sulfate, protease Savinase ultra 16XL into the mixture of S1, mix uniformly to obtain.

[0084] Preparation of a washing machine tub cleaner

[0085] I. Components of the washing machine tank cleaner

[0086] The same as example 1, except that sodium carbonate is replaced by dipotassium hydrogen phosphate, i.e. the washing machine tank cleaner of the present comparative example comprises the following components in mass percentage: sodium percarbonate 50%, potassium hydroxide 5%, dipotassium hydrogen phosphate 20%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 5%, and the balance is anhydrous sodium sulfate.

[0087] II. Preparation method of the washing machine tank cleaner

[0088] S1. Mix sodium percarbonate, potassium hydroxide, dipotassium hydrogen phosphate, and anhydrous sodium sulfate uniformly;

[0089] S2. Add sodium dodecyl sulfate and protease Savinase ultra 16XL to the mixture of S1, mix uniformly to obtain.

[0090] Preparation of a washing machine tank cleaner

[0091] I. Components of the washing machine tank cleaner

[0092] The same as example 1, except that sodium carbonate is replaced by sodium tripolyphosphate, i.e. the washing machine tank cleaner of the present comparative example comprises the following components in mass percentage: sodium percarbonate 50%, potassium hydroxide 5%, sodium tripolyphosphate 20%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 5%, and the balance is anhydrous sodium sulfate.

[0093] II. Preparation method of the washing machine tank cleaner

[0094] S1. Mix sodium percarbonate, potassium hydroxide, dipotassium hydrogen phosphate, and anhydrous sodium sulfate uniformly;

[0095] S2. Add sodium dodecyl sulfate and protease Savinase ultra 16XL to the mixture of S1, mix uniformly to obtain.

[0096] Preparation of a washing machine tank cleaner

[0097] I. Components of the washing machine tank cleaner

[0098] The same as example 1, except that sodium carbonate is replaced by potassium hydroxide, i.e. the washing machine tank cleaner of the present comparative example comprises the following components in mass percentage: sodium percarbonate 50%, potassium hydroxide 25%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 5%, and the balance is anhydrous sodium sulfate.

[0099] II. Preparation method of the washing machine tank cleaner

[0100] S1. Mix sodium percarbonate, potassium hydroxide, anhydrous sodium sulfate uniformly;

[0101] S2. Add sodium dodecyl sulfate, protease Savinase ultra 16XL into the mixture of S1, mix uniformly to obtain.

[0102] Preparation of a washing machine tank cleaner

[0103] I. Components of the washing machine tank cleaner

[0104] The same as Example 1, except that potassium hydroxide is replaced by sodium carbonate, i.e. the washing machine tank cleaner of the present comparative example contains the following components in mass percentage: sodium percarbonate 50%, sodium carbonate 25%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 5%, and the rest is anhydrous sodium sulfate, as shown in Table 1.

[0105] II. Preparation method of the washing machine tank cleaner

[0106] S1. Mix sodium percarbonate, potassium hydroxide, anhydrous sodium sulfate uniformly;

[0107] S2. Add sodium dodecyl sulfate, protease Savinase ultra 16XL into the mixture of S1, mix uniformly to obtain.

[0108] Preparation of a washing machine tank cleaner

[0109] I. Components of the washing machine tank cleaner

[0110] The same as Example 1, except that sodium percarbonate is replaced by percarbonamide, i.e. the washing machine tank cleaner of the present comparative example contains the following components in mass percentage: percarbonamide 50%, potassium hydroxide 5%, sodium carbonate 20%, sodium dodecyl sulfate 5%, protease Savinase ultra 16XL 5%, and the rest is anhydrous sodium sulfate, as shown in Table 1.

[0111] II. Preparation method of the washing machine tank cleaner

[0112] S1. Mix sodium percarbonate, potassium hydroxide, anhydrous sodium sulfate uniformly;

[0113] S2. Add sodium dodecyl sulfate, protease Savinase ultra 16XL into the mixture of S1, mix uniformly to obtain.

[0114] Table 1 Components and amounts of each component of the washing machine tank cleaner

[0115] Test Example 1

[0116] I. Bacteriostasis ability test

[0117] 10 g of the washing machine sump cleaner obtained in Examples 1-7 and Comparative Examples 1-7 was dissolved in 1 L of water, and the bacteriostasis rates thereof on S. aureus ATCC 6538, E. coli ATCC 25922 and C. albicans ATCC 10231 within 20 min were tested according to the method of WS / T650-2019, and the results are shown in Table 2.

[0118] Table 2. Results of bacteriostasis ability test

[0119] From Table 2, it can be seen that:

[0120] (1) The bacteriostasis rates of Examples 1-7 all reached more than 99.9%, which were significantly better than Comparative Examples 1-4 and 6-7, indicating that the bacteriostasis ability of the washing machine sump cleaner of the present application was better.

[0121] (2) The bacteriostasis rate of Example 1 reached more than 99.95%, while the highest of Comparative Examples 1-4 and 7 which replaced inorganic alkali or buffer alkali or peroxide species could only reach 92.80%, i.e. the bacteriostasis ability of the washing machine sump cleaner of Comparative Examples 1-4 and 7 was significantly worse than Example 1, indicating that in the specific peroxide system of the present application, specific inorganic alkali and specific buffer alkali need to be used to achieve such excellent bacteriostasis ability.

[0122] II. Hair solubility ability test

[0123] 100 g of the washing machine sump cleaner obtained in Examples 1-7 and Comparative Examples 1-7 was dissolved in 20 L of water, and then 10.0000 g of hair (M0) was added, mixed, and after standing for 30 min, the residual hair was filtered and dried and weighed (M). The solubility rate of the washing machine sump cleaner on hair was calculated according to the formula "Hair solubility rate (%) = (M0-M) / M0 x 100%", and the results are shown in Table 3.

[0124] Table 3. Results of hair solubility ability test

[0125] From Table 3, it can be seen that:

[0126] (1) The solubility rates of Examples 1-7 on hair all reached more than 96%, which were significantly better than Comparative Examples 1-7, indicating that the hair solubility ability of the washing machine sump cleaner of the present application was better.

[0127] (2) Example 1 achieved a hair dissolution rate of over 99%, while Comparative Examples 1-4 and 7, which replaced the inorganic alkali, buffer alkali, or peroxide, could only reach a maximum of 89.3%. That is, the hair dissolution ability of the washing machine tub cleaners in Comparative Examples 1-4 and 7 was significantly worse than that in Example 1. This indicates that in the specific peroxide system of the present invention, specific inorganic alkali and specific buffer alkali are required to achieve such excellent hair dissolution ability.

[0128] (3) Example 1 achieved a hair dissolution rate of over 99%, while Comparative Examples 5-6, which only added inorganic alkali or only added buffer alkali, could only reach a maximum of 90.5%. That is, the hair dissolution ability of the washing machine tub cleaners of Comparative Examples 5-6 was significantly worse than that of Example 1, indicating that in the washing machine tub cleaner of the present invention, inorganic alkali and buffer alkali played a synergistic role in dissolving hair.

[0129] III. Hair Decomposition Ability Test

[0130] Tyrosine standards were dissolved in water to achieve concentrations of 0, 10, 20, 30, 40, 50, and 60 μg / mL. Then, 5 mL of 0.4 M sodium carbonate solution and 1 mL of Folin-Ciocalteu reagent were added. The solutions were incubated in a 40℃ water bath for 10 min, and the absorbance was measured at 680 nm. A tyrosine standard curve was plotted with the concentration of the tyrosine standard as the x-axis and the absorbance as the y-axis. The equation is Y = 0.011X + 0.0095, R0. 2 =0.9979.

[0131] Dissolve 2g of the washing machine tub cleaners obtained in Examples 1-7 and Comparative Examples 1-7 in 100mL of water, then add 1g of hair to each, soak at 30℃ for 20min, and filter to collect the filtrate. Take 1mL of the filtrate and add it to 5mL of 0.4M g sodium carbonate solution and 1mL of Folin reagent. Place in a 40℃ constant temperature water bath for color development for 10min, and measure the absorbance of the solution at 680nm. Determine the concentration of tyrosine in the solution according to the tyrosine standard curve. The results are shown in Table 4.

[0132] Table 4 Results of Hair Decomposition Ability Test

[0133] As shown in Table 4:

[0134] (1) The tyrosine concentration of the filtrate of Examples 1 to 7 reached 54 μg / mL or more, which was significantly better than that of Comparative Examples 1 to 7, indicating that the hair decomposition ability of the washing machine tub cleaner of the present invention is better.

[0135] (2) The tyrosine concentration of the filtrate of Example 1 reached 55.1 μg / mL, while the highest concentration of Comparative Examples 1-4 and 7, which replaced the inorganic base, buffer base, or peroxide, was only 37.6 μg / mL. That is, the hair decomposition ability of the washing machine tub cleaners of Comparative Examples 1-4 and 7 was significantly worse than that of Example 1. This indicates that in the specific peroxide system of the present invention, specific inorganic bases and specific buffer bases are required to achieve such excellent hair decomposition ability.

[0136] (3) The tyrosine concentration in the filtrate of Example 1 reached 55.1 μg / mL, while the highest concentration in Comparative Examples 5-6, which only added inorganic alkali or only added buffer alkali, was only 38.3%. This means that the hair-decomposing ability of the washing machine tub cleaners in Comparative Examples 5-6 was significantly worse than that in Example 1.

[0137] Example 1 demonstrates that in the washing machine tub cleaner of the present invention, inorganic alkali and buffer alkali play a synergistic role in decomposing hair.

[0138] IV. Dirt Removal Ability Test

[0139] According to the method in Appendix A of QB / T 4314, the detergency of the washing machine tub cleaners obtained in Examples 1-7 and Comparative Examples 1-7 was tested, and the results are shown in Table 5.

[0140] Table 5. Results of detergency test

[0141] As shown in Table 5:

[0142] (1) The cleaning power of Examples 1 to 7 is significantly higher than that of Comparative Examples 1 to 7, indicating that the cleaning agent of the washing machine tub of the present invention has better dirt removal ability.

[0143] (2) The detergency of Example 1 reached 96.2%, while the highest detergency of Comparative Examples 1-4 and 7, which replaced the inorganic alkali, buffer alkali, or peroxide, was only 86.9%. That is, the detergency of the washing machine tub cleaners in Comparative Examples 1-4 and 7 was significantly worse than that of Example 1. This indicates that in the specific peroxide system of the present invention, specific inorganic alkalis and specific buffer alkalis are required to achieve such excellent dirt removal ability.

[0144] (3) The detergency of Example 1 reached 96.2%, while the highest detergency of Comparative Examples 5-6, which only added inorganic alkali or only added buffer alkali, could only reach 91.5%. That is, the detergency of the washing machine tub cleaner of Comparative Examples 5-6 was significantly worse than that of Example 1, indicating that in the washing machine tub cleaner of the present invention, inorganic alkali and buffer alkali played a synergistic role in removing dirt.

[0145] V. On-site testing of the washing machine tub

[0146] Select 42 washing machines with similar hair and dirt pollution in the tub, divide into 14 groups, 3 washing machines in each group. Dissolve 300g washing machine tub cleaner obtained in Examples 1-7 and Comparative Examples 1-7 in 60L water, then take 20L into the washing machine drum of different groups, start the standard washing mode of the washing machine, and observe the hair and dirt residues in the washing machine tub after washing, the results are shown in Table 6.

[0147] Table 6: Field test results

[0148] Note: The order from less to more in Table 6 is: none < very little < little < less < more < much < very much.

[0149] From Table 6, we can see that:

[0150] (1) The hair and dirt residues of Examples 1-7 are significantly less than those of Comparative Examples 1-7, indicating that the hair dissolution capacity and dirt removal capacity of the washing machine tub cleaner of the present application are both better.

[0151] (2) There is no hair and dirt residue in Example 1, while Comparative Examples 1-4, 7, which replace inorganic alkali or buffer alkali or peroxide species, all have more / much hair or dirt residue, i.e. the hair dissolution capacity and dirt removal capacity of the washing machine tub cleaner of Comparative Examples 1-4, 7 are significantly worse than that of Example 1, indicating that in the specific peroxide system of the present application, a specific inorganic alkali and a specific buffer alkali must be used to achieve such excellent hair dissolution capacity and dirt removal capacity.

[0152] (3) There is still hair and dirt residue in Comparative Examples 5-6, which only add inorganic alkali or only add buffer alkali, i.e. the hair dissolution capacity and dirt removal capacity of the washing machine tub cleaner of Comparative Examples 5-6 are significantly worse than that of Example 1, indicating that inorganic alkali and buffer alkali in the washing machine tub cleaner of the present application play a synergistic role in dissolving hair and removing dirt.

[0153] The above examples are preferred embodiments of the present application, but the embodiments of the present application are not limited by the above examples, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application are equivalent replacement methods, which are all included in the protection scope of the present application.

Claims

1. A laundry machine tub cleaner characterized by, It comprises the following components in mass percentage: peroxide 30-50%, inorganic alkali 3-10%, buffer alkali 15-20%, sodium dodecyl sulfate 1-5%, protease 1-5%, and the rest is anhydrous sodium sulfate; The inorganic alkali is potassium hydroxide and / or sodium hydroxide, the buffer alkali is sodium carbonate and / or sodium bicarbonate, and the peroxide is sodium percarbonate and / or sodium perborate.

2. The cleaning agent of claim 1, wherein, It comprises the following components in mass percentage: peroxide 45-50%, inorganic alkali 5-9%, buffer alkali 15-20%, sodium dodecyl sulfate 4-5%, protease 4-5%, and the rest is anhydrous sodium sulfate.

3. The cleaning agent of claim 1, wherein, The peroxide is sodium percarbonate.

4. The cleaning agent of claim 1, wherein, The inorganic alkali is potassium hydroxide.

5. The cleaning agent of claim 1, wherein, The buffer alkali is sodium carbonate.

6. The cleaning agent of claim 1, wherein, The protease is alkaline protease.

7. The cleaning agent of claim 6, wherein, The alkaline protease is Savinase ultra 16XL and / or Progress Uno 100L.

8. The use of the cleaning agent according to any one of claims 1-7 in cleaning the tank of a washing machine.

9. A method of preparing the cleaning agent according to any one of claims 1 to 7, characterized in that, It comprises the following steps: S1. Mix peroxide, inorganic alkali, buffer alkali, and anhydrous sodium sulfate; S2. Add sodium dodecyl sulfate and protease to the mixture of S1, and mix to obtain the cleaning agent.

10. A method of cleaning a washing machine tub, characterized by, Pour the cleaning agent according to any one of claims 1-7 into the tank of a washing machine, and start the washing machine.

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