A stain composition for evaluating the cleaning power of liquid washing machine tank cleaner and a preparation method thereof

Abstract

The present invention provides a stain composition for evaluating the cleaning power of a liquid washing machine tank detergent, including the following components by mass fraction: 40-45% red clay, 0.1-1% magnesium stearate, 0.1-1% dirty cloth scraps, 0.1-1% paper towel scraps, 0.1-0.5% auxiliary agent, and deionized water. The present invention also provides a method for preparing the stain composition, including the following steps: S1, adding red clay and deionized water to a container for blending, and stirring evenly; S2, adding magnesium stearate to a container, stirring evenly; S3, adding dirty cloth scraps to a container, stirring evenly; S4, adding paper towel scraps to a container, stirring evenly; S5, adding an auxiliary agent to a container, stirring evenly, and obtaining a product. The present invention enhances the adhesion and compactness of the stain composition by entanglement of the components with each other, can more realistically simulate the actual situation of the stains in the inner tank of the washing machine, and is used for the evaluation test of the cleaning power of the detergent, and has good application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of daily chemical washing, and mainly relates to a stain composition for evaluating the cleaning power of a liquid washing machine tank detergent and a preparation method thereof. Background Art

[0002] The world's first electric washing machine was invented in 1910. After nearly a century of development, as a daily household appliance, the market penetration rate of washing machines has exceeded 76% nationwide, of which the urban market has exceeded 96% and the rural market has exceeded 53%.

[0003] In recent years, topics such as hygiene and health have become increasingly hot, and people have become more and more aware of the hygiene and cleaning of washing machine troughs. Therefore, washing machine trough cleaners have come into being, and major manufacturers have launched washing machine trough cleaners one after another.

[0004] However, there is no testing standard for the cleaning power of liquid washing machine trough cleaners in China. Although the products launched by domestic manufacturers claim to have strong penetration and descaling functions, there are no specific experimental tests and experimental data. In the test standard for the cleaning power of general water-based detergents for cleaning metal materials and metal parts in QBT2117-1995 "Universal Water-Based Metal Cleaner", the method is mainly to contaminate a certain size of iron sheet with specified grease, wash it after aging under certain conditions, and finally calculate the cleaning power based on the removal of the grease; but the main components of the stains in the washing machine trough are (1) dust, dirt and other substances brought in by clothes; (2) scale formed by calcium and magnesium ions in tap water; (3) clothing fibers; (4) organic matter from the human body. The above stains are entangled together and firmly attached to the interlayer of the washing machine. Therefore, the type of stains on the iron sheet in the test method for the cleaning power of metal detergents in QBT2117-1995 "Universal Water-Based Metal Cleaner" is not suitable for evaluating the cleaning power of washing machine trough cleaners.

[0005] Therefore, it is necessary to develop a stain composition for evaluating the cleaning power of liquid washing machine tank cleaners. Summary of the invention

[0006] The present invention provides a stain composition for evaluating the cleaning power of a liquid washing machine tank detergent. The stain composition for evaluating the cleaning power of a liquid washing machine tank detergent has relatively high adhesion, density, and uniformity, is closer to the actual situation of stains in the inner tank of a metal washing machine, and the preparation method is simple and easy to operate, and has good application prospects.

[0007] One object of the present invention is to provide a stain composition for evaluating the cleaning power of a liquid washing machine tank detergent, wherein the stain composition for evaluating the cleaning power of a liquid washing machine tank detergent comprises the following components in mass fractions:

[0008]

[0009]

[0010] Furthermore, the particle size of the red clay is ≤5 mm.

[0011] Red clay is a type of soil developed under tropical and subtropical rainforests, monsoon forests or evergreen broad-leaved forests. It is formed by the weathering of carbonates or other rocks containing iron-aluminum oxides under hot and humid climate conditions. Red clay is usually brown-red, has high water content, low density, high strength, low compressibility, loose texture, strong air permeability and water permeability; red clay particles have a large mesh size, and after being mixed with a certain proportion of water, it can form a relatively fine and uniform mud, and has good compatibility with other additives. In contrast, alkaline soil is mostly white, yellow and other light colors, with a hard texture, easy to compact into blocks, and poor air permeability and water permeability; alkaline soil particles have a small mesh size, and after being mixed with water, it is difficult to form a fine and uniform mud, and it is difficult to evenly coat it on the iron sheet. Therefore, red clay can be used as the main component, and other components can be added to simulate the stains in the washing machine trough to develop a stain composition for evaluating the cleaning power of the washing machine trough cleaner, so that it is more in line with the actual situation of the washing machine trough, and the stain should have relatively high adhesion (reducing the chance of the stain falling randomly), density, and uniformity (reducing the tendency of the stain to solidify into large pieces, strips, and clumps) to ensure that the cleaning power of the washing machine trough cleaner can be effectively tested, and the difference in contaminated iron sheets during the experiment is small, the experimental repeatability is good, and it has the advantages of simple and convenient operation.

[0012] Furthermore, the particle size of the magnesium stearate is ≤270 μm.

[0013] Furthermore, the dirty cloth scraps are selected from one or more of protein dirty cloth, sebum dirty cloth, and carbon black dirty cloth.

[0014] Furthermore, the paper towel scraps are selected from wood pulp paper towels.

[0015] Furthermore, the auxiliary agent is selected from one or both of artificial sebum and artificial sweat.

[0016] Furthermore, the length and width of the dirty cloth scraps are both ≤2 mm.

[0017] Furthermore, the length and width of the paper towel scraps are both ≤2 mm.

[0018] Another object of the present invention is to provide a method for preparing the above-mentioned stain composition for evaluating the cleaning power of a liquid washing machine tank detergent, the method for preparing the stain composition for evaluating the cleaning power of a liquid washing machine tank detergent comprising the following steps:

[0019] S1. Add red clay and deionized water into a container and mix well;

[0020] S2, adding magnesium stearate into the container and stirring evenly;

[0021] S3, add the dirty cloth scraps into the container and stir evenly;

[0022] S4. Add paper towel crumbs into the container and stir evenly;

[0023] S5. Add the auxiliary agent into the container and stir evenly to obtain a stain composition for evaluating the cleaning power of the liquid washing machine tank cleaner.

[0024] Furthermore, in step S2, magnesium stearate is added to the container in multiple batches.

[0025] Furthermore, in step S3, the dirty cloth scraps are added into the container in multiple batches.

[0026] Furthermore, in step S4, paper towel scraps are added into the container in multiple batches.

[0027] The present invention has the following beneficial effects:

[0028] The stain composition for cleaning power evaluation of a liquid washing machine tank cleaner provided by the present invention uses red clay to simulate dust and soil in the stains in the inner tank of a washing machine, uses magnesium stearate to simulate scale formed by calcium and magnesium ions in tap water, and uses dirty cloth scraps and paper towel scraps to simulate clothing fibers and human organic matter, which can more realistically simulate the actual situation of stains in the inner tank of a washing machine.

[0029] The red clay particles are relatively large, and after being mixed with a certain proportion of water, they can form a relatively fine and uniform mud, which improves the compatibility with other additives and avoids agglomeration. Magnesium stearate can increase adhesion and has anionic properties. It can adsorb and combine with iron, aluminum oxides and salts containing positive charges, thereby fully filling the loose red clay and forming a denser structure for the originally loose red clay. On this basis, continue to add scraps of dirty cloth and paper towels to entangle the stains together, further enhancing the adhesion between the stains, making it easier to adhere to the iron sheet, and making the stains coated on the iron sheet denser, forming a denser layer of stains after aging.

[0030] The invention provides a method for preparing a stain composition for evaluating the cleaning power of a liquid washing machine tank detergent. The stain composition prepared by the method has strong repeatability and good effect on distinguishing the cleaning power of detergents. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solution of the present invention, the following examples are listed. Unless otherwise stated, the raw materials, reactions and post-treatment methods shown in the examples are common raw materials on the market and technical methods well known to those skilled in the art.

[0032] The words "preferred", "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0033] It should be understood that, except in any operating examples, or where otherwise indicated, all numbers indicating, for example, the amounts of ingredients used in the specification and claims should be understood to be modified in all cases by the term "about". Therefore, unless indicated to the contrary, the numerical parameters set forth in the following specification and the appended claims are approximate values ​​that vary depending on the desired properties to be obtained by the present invention.

[0034] The following raw materials are used in the embodiments of the present invention:

[0035] Red clay, particle size ≤5 mm, purchased from Anhui Huainan Huizhuang Horticulture Company;

[0036] Magnesium stearate, chemical formula C 36 H 70 MgO4, particle size ≤ 270 μm;

[0037] The dirty cloth scraps were JB-03 sebum-stained cloth, with length and width both ≤ 2 mm, purchased from Guangzhou Institute of Microbiology;

[0038] The paper towel scraps were 100% virgin wood pulp paper towels, with length and width both ≤ 2 mm, purchased from Vinda Company.

[0039] Artificial sweat was used as the auxiliary agent and was purchased from Guangzhou Deli Technology Company.

[0040] According to the components and mass fractions in Table 1, the stain compositions of Examples 1-2 and Comparative Examples 1-3 were prepared respectively.

[0041] Table 1 Mass fraction of each component of the stain composition of Examples 1-2 and Comparative Examples 1-3

[0042]

[0043] The preparation method of the stain composition of the above-mentioned Examples 1-2 and Comparative Examples 1-3 comprises the following steps:

[0044] S1. Add red clay and deionized water into a container according to the above mass fractions and mix well;

[0045] S2. According to the above mass fraction, magnesium stearate is added to the container in multiple batches (one-third of the mass each time) and stirred evenly;

[0046] S3. Add the dirty cloth scraps into the container in multiple batches (one third of the mass each time) according to the above mass fractions and stir evenly;

[0047] S4. Add the paper towel scraps into the container in batches (one third of the mass each time) according to the above mass fractions and stir evenly;

[0048] S5. Add artificial sweat into the container according to the above mass fraction and stir evenly to obtain a stain composition for evaluating the cleaning power of liquid washing machine tank cleaner.

[0049] Test Example 1

[0050] The stain evaluation test was performed on the stain compositions of Examples 1-2 and Comparative Examples 1-3 to test their adhesion and density.

[0051] Test method:

[0052] Prepare 15 iron sheets with specifications of 50mm×25mm×3mm, with 3 iron sheets in each group, for a total of 5 groups, corresponding to Examples 1-2 and Comparative Examples 1-3, respectively. Use a small weighing spoon to evenly apply the configured stain composition on the front, back, left, right and bottom five sides of the iron sheet, leaving the top 10mm unstained. The amount of stain applied is 2-2.3g. After staining, place it in a 45±5℃ oven for 2-3h and dry it for use. After aging, cool it to room temperature and let 10 trained evaluators evaluate the density of the stain on the iron sheet. The main focus is on whether dense mud can be formed on the surface of the stain and whether there are obvious cracks on the surface. Score it on a scale of 1-5 points. The higher the score, the better the density of the iron sheet coated with the stain composition. Each group of test results is the average of the total scores of all samples evaluated by 10 evaluators. In order to test the repeatability of density, the above experimental repeatability test was performed 5 times, recorded as 1#, 2#, 3#, 4#, and 5#. For the adhesion test, each set of iron sheets obtained above was hung in a beaker filled with tap water so that the stains could be completely immersed. After soaking for 90 seconds, they were dried in an oven at 45±5℃, and the proportion of stains falling was calculated. If the proportion of stains falling was ≤5%, it was qualified. The results of the above tests are shown in Table 2.

[0053] Table 2 Stain evaluation test results of the stain compositions of Examples 1-2 and Comparative Examples 1-3

[0054]

[0055] As can be seen from Table 2, through the adhesion and density test results, it can be found that the adhesion of the stain composition of Examples 1-2 is better than that of Comparative Examples 1-3, and the density is much stronger than that of Comparative Examples 1-2. This is because the red clay and deionized water in Comparative Example 3 are in a suitable ratio range, and the stain formed by smearing will not show cracks after aging, that is, the density is almost the same as that of Examples 1-2, but magnesium stearate is not added, resulting in a decrease in the adhesion between the stains and the stains and the iron sheet, resulting in the stains in Comparative Example 3 being easier to fall off, that is, the adhesion is unqualified; since the ratio of red clay to deionized water in Comparative Example 1-2 is different from that in Examples 1-2, the obtained stain compositions are very different. When there is too little red clay and too much deionized water, the stain composition will be too thin and it will be difficult to effectively adhere to the iron sheet. It will easily fall off when smeared and cannot form a dense stain layer. The adhesion and density are very poor; and when there is too much red clay and too little deionized water, the stain composition will be too thick. Although it can effectively adhere to the iron sheet and is not easy to slide when smeared, it is difficult to smear evenly. After aging, multiple cracks are likely to appear due to the thick coating, resulting in a decrease in density and adhesion. The density of the stain compositions of Examples 1-2 and Comparative Examples 1-3 was tested for repeatability, and the repeatability test results showed that the density of the stain compositions of the same components was not significantly different, indicating that the stain compositions had good repeatability. This shows that the stain compositions prepared by the technical solution of the present invention for evaluating the metal washing machine tank cleaner have strong adhesion, relatively good density, and stronger repeatability, and are more suitable for evaluating the cleaning ability of the washing machine tank cleaner.

[0056] Test Example 2

[0057] The cleaning power evaluation test of the stain compositions of Examples 1-2 and Comparative Examples 1-3 was performed.

[0058] Test method:

[0059] The standard oscillating washing machine used is the RHBX-II hard surface oscillating washing machine with an oscillation frequency of 55 times / min. Fifteen iron sheets with a specification of 50mm×25mm×3mm are prepared for each detergent sample. Three iron sheets are set for each embodiment and comparative example, and tested separately, respectively, and recorded as 1#, 2#, and 3#. The mass of the stained iron sheet is weighed before the test and recorded as m0. After smearing and aging, the mass after smearing is weighed and recorded as m1. At a water temperature of 25°C, the prepared washing machine tank cleaner is formulated according to Table 3, and then 250ppm hard water (containing 0.165g / L anhydrous calcium chloride and 0.247g / L magnesium sulfate) is added according to the mass fraction of the detergent of 3% to prepare the detergent solution. In a 500mL beaker, pour 400mL of the prepared detergent solution, then clamp the iron sheet coated with stains on the swing rack of the swing washer, make the surface of the test piece perpendicular to the swing direction, soak in the detergent solution for 3min, and then immediately start the swing washer to wash for 15min. After the swing washing is completed, take out the iron sheet together with the hook, wash it in 400mL of distilled water for 30s, hang it on the iron sheet rack, put it in a constant temperature drying oven at 45℃, dry it for 1h, cool it to room temperature, weigh and record m2, calculate the cleaning power, and the cleaning power is expressed by the mass fraction of the stain washed away: cleaning power = (m1-m2) / (m1-m0)×100%; the higher the cleaning power, the better the cleaning power of the detergent. The cleaning power evaluation test results of the detergent are shown in Table 4.

[0060] Table 3 Cleaning agent formula ingredients

[0061]

[0062] Table 4 Detergent cleaning power evaluation test results (%)

[0063]

[0064]

[0065] As can be seen from Tables 3 and 4, after testing the cleaning power of different washing machine tank cleaners, their cleaning power is calculated. It can be found that the cleaning power difference of the stain composition of Examples 1-2 in different washing machine tank cleaners is obvious, which is consistent with the cleaning power change trend after the washing machine tank cleaner formula composition changes, and in the repeatability test of the same washing machine tank cleaner, the cleaning power is not significantly different, and the stain reproducibility is good. The cleaning power difference of the stain composition of Comparative Examples 1-3 in different washing machine tank cleaners is smaller than that of Examples 1-2. In the repeatability test, the cleaning power of Comparative Example 2 fluctuates greatly, and the reproducibility of the stain is poor; that is, in the cleaning power evaluation process, the discrimination degree of Comparative Examples 1-3 for detergents is less than that of Examples 1-2, and the cleaning power of washing machine tank cleaner products cannot be evaluated well. Therefore, when the stain composition of Examples 1-2 is applied to the cleaning power evaluation of liquid washing machine tank cleaners, the degree of difference shown is far more ideal than that of Comparative Examples 1-3, and is more suitable for the cleaning power evaluation of liquid washing machine tank cleaner products.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0067] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A stain composition for evaluating the cleaning power of a liquid washing machine tank cleaner, characterized in that: The stain composition for evaluating the cleaning power of a liquid washing machine tank cleaner comprises the following components in mass fractions: The particle size of the red clay is ≤5 mm; The particle size of the magnesium stearate is ≤270 μm.

2. The stain composition for evaluating the cleaning power of a liquid washing machine tank cleaner according to claim 1, characterized in that: The dirty cloth scraps are selected from one or more of protein dirty cloth, sebum dirty cloth, and carbon black dirty cloth.

3. The stain composition for evaluating the cleaning power of a liquid washing machine tank cleaner according to claim 1, characterized in that: The tissue scraps are selected from wood pulp tissues.

4. The stain composition for evaluating the cleaning power of a liquid washing machine tank cleaner according to claim 1, characterized in that: The auxiliary agent is selected from one or both of artificial sebum and artificial sweat.

5. The stain composition for evaluating the cleaning power of liquid washing machine tank cleaner according to claim 1, characterized in that: The length and width of the dirty cloth scraps are both ≤2mm.

6. The stain composition for evaluating the cleaning power of liquid washing machine tank cleaner according to claim 1, characterized in that: The length and width of the paper towel scraps are both ≤2 mm.

7. The method for preparing the stain composition for evaluating the cleaning power of liquid washing machine tank cleaner according to any one of claims 1 to 6, characterized in that: The method for preparing the stain composition for evaluating the cleaning power of a liquid washing machine tank cleaner comprises the following steps: S1. Add red clay and deionized water into a container and mix well; S2, adding magnesium stearate into the container and stirring evenly; S3, add the dirty cloth scraps into the container and stir evenly; S4. Add paper towel crumbs into the container and stir evenly; S5. Add the auxiliary agent into the container and stir evenly to obtain a stain composition for evaluating the cleaning power of the liquid washing machine tank cleaner.

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