Stain composition for rapid deoiling cleaning power evaluation of liquid detergent and preparation method of stain composition

Abstract

The invention provides a stain composition for evaluating the rapid deoiling cleaning power of a liquid detergent, and the stain composition for evaluating the rapid deoiling cleaning power of the liquid detergent comprises the following components: animal and plant mixed grease, modified starch, protein minced meat, fiber vegetable chippings, an auxiliary agent and deionized water, wherein the modified starch is obtained by firstly gelatinizing starch, then reacting with allyl glycidyl ether, and finally polymerizing with unsaturated fatty acid and acrylic acid. Unsaturated fatty acid and acrylic acid are introduced into the modified starch in the stain composition for rapidly evaluating the deoiling cleaning power of the liquid detergent, so that the compatibility, the adhesion and the stability of all the components are improved, and the deoiling cleaning power of the detergent can be better evaluated; moreover, the stain composition highly simulates real oil stain characteristics, the preparation method is simple and convenient, the repeatability is good, and the stain composition has a good application prospect.

Description

Technical Field

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

[0002] In modern life, dishwashing detergent has become an indispensable cleaning product in the family kitchen, and its main function is to quickly and effectively remove the oil stains on the surface of tableware. With the continuous improvement of consumers' requirements for cleaning effects and quality of life, a large number of liquid dishwashing detergent products of different brands and types have emerged on the market. These products often emphasize their excellent oil-removing cleaning capabilities in publicity, but there are significant differences in actual effects.

[0003] To accurately evaluate the oil-removing ability of dishwashing detergent and help consumers make purchases, reasonable evaluation must be carried out. However, currently, the evaluation of the quick oil-removing cleaning power of liquid dishwashing detergent faces many challenges.

[0004] From the perspective of industry standards, there is a lack of unified, authoritative and accurate evaluation standards that can reflect the actual use effects of products. Some existing test methods use overly simple stain components and cannot truly simulate the complex and diverse oil stain conditions on daily tableware. For example, some tests only use a single oil as the stain, ignoring the composite dirt formed by the interweaving of various components such as protein, starch, and fiber in food residues with the oil, and these components will significantly affect the cleaning difficulty and effect of dishwashing detergent.

[0005] From the perspective of actual application, when consumers purchase dishwashing detergent, due to the lack of reliable evaluation basis, it is difficult to judge the true performance of the product. This not only causes consumers to possibly buy products with poor cleaning effects and affects the use experience, but also makes it difficult for production enterprises to accurately evaluate the advantages and disadvantages of their own products, hindering the improvement of the overall product quality. For production enterprises, if they cannot accurately evaluate the oil-removing cleaning power of products, it is difficult to optimize the formula and improve the production process targeted, and thus they are at a disadvantage in the market competition.

[0006] In summary, it is necessary to develop a new technical solution to solve the defects and deficiencies existing in the prior art. Summary of the Invention

[0007] The present invention provides a stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent and a preparation method thereof. The stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent contains components such as a mixture of animal and vegetable oils and modified starch. The modified starch is introduced with unsaturated fatty acids and acrylic acid, which is beneficial to improving the compatibility, adhesiveness, and stability of each component, and can better evaluate the oil-removing cleaning power of dishwashing detergent. Moreover, the stain composition highly simulates the characteristics of real oil stains, the preparation method is simple and has good repeatability, and it has good application prospects.

[0008] An object of the present invention is to provide a stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent. The stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent includes the following components in mass fractions:

[0009]

[0010] Among them, the modified starch is obtained by first gelatinizing the starch, then reacting it with allyl glycidyl ether, and finally polymerizing it with unsaturated fatty acids and acrylic acid.

[0011] Furthermore, the acid value of the mixture of animal and vegetable oils is ≤ 3 mg KOH / g.

[0012] The mixture of animal and vegetable oils in the present invention is refined oil, which is liquid at room temperature to ensure the stable quality of the oil and better simulate real oil stains.

[0013] Furthermore, the starch is selected from one or more of corn starch, potato starch, wheat starch, and oat starch, and the particle size is ≤ 100 μm.

[0014] The starch in the present invention can simulate the starch component in food residues.

[0015] Furthermore, the minced protein meat is selected from one or more of fresh chicken, fresh pork, and fresh beef, and the side length is ≤ 3 mm.

[0016] The minced protein meat in the present invention removes visible fat and fascia and simulates protein-based dirt remaining on tableware.

[0017] Furthermore, the fiber vegetable debris is selected from one or more of fresh broccoli, fresh spinach, and fresh lettuce, and the side length is ≤ 3 mm.

[0018] The fiber vegetable debris in the present invention is used to simulate fiber impurities attached to the surface of tableware.

[0019] Furthermore, the auxiliary agent is selected from one or more of sodium dodecylbenzenesulfonate and sodium citrate.

[0020] The auxiliary agent of the present invention has the functions of enhancing the emulsification effect, adjusting the pH value, promoting dispersion and suspension, and enhancing the adhesion force. Among them, sodium dodecylbenzenesulfonate reduces the surface tension between the mixed animal and vegetable oils and water, and promotes the emulsification of the mixed animal and vegetable oils; sodium citrate can adjust the pH value of the stain composition and maintain the stability of each component; the two work together to promote the dispersion and suspension of solid particles and prevent agglomeration; at the same time, they jointly enhance the adhesion force of the stain composition on the test carrier.

[0021] Another object of the present invention is to provide a preparation method of the above-mentioned stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent. The preparation method of the stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent includes the following steps:

[0022] S1. Blend starch and distilled water, heat and stir to obtain gelatinized starch;

[0023] S2. Blend the gelatinized starch, allyl glycidyl ether, and catalyst, heat and stir to react to obtain an intermediate product;

[0024] S3. Blend the intermediate product, unsaturated fatty acid, acrylic acid, and initiator, heat and stir to react to obtain modified starch;

[0025] S4. Add the modified starch, mixed animal and vegetable oils, and deionized water to a container, blend and stir evenly;

[0026] S5. Add minced protein and fiber vegetable debris to a container, blend and stir evenly;

[0027] S6. Add the auxiliary agent to a container, blend and stir evenly to obtain a stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent.

[0028] Further, in step S1, the temperature of the heating and stirring is 60 - 80°C.

[0029] Further, in step S2, the mass ratio of the gelatinized starch to allyl glycidyl ether is (4 - 6):1, and the temperature of the heating and stirring reaction is 90 - 100°C.

[0030] Further, in step S3, the mass ratio of the intermediate product, unsaturated fatty acid, and acrylic acid is (4 - 6):(1 - 2):(1 - 2), and the temperature of the heating and stirring reaction is 70 - 90°C.

[0031] Through a specific preparation process, the components of the present invention are fully mixed and interact with each other, enhancing the adhesion and stability of the stain composition. During the emulsification process, the mixed animal and vegetable oils are evenly dispersed in the colloidal system formed by the modified starch. The minced protein meat and fiber vegetable debris are intertwined with the colloid. The addition of the auxiliary agent further adjusts the surface properties of the stain composition, making it easier to adhere to the test carrier and not easily fall off during the evaluation process, ensuring the accuracy and reliability of the evaluation results.

[0032] The detailed preparation steps and parameter control of the present invention make the preparation process more standardized and controllable. The performance of the stain compositions prepared in different batches is stable, and the differentiating effect on the cleaning power of different liquid dishwashing detergents is good, which helps production enterprises and testing institutions accurately evaluate the rapid degreasing cleaning power of dishwashing detergents and promote the improvement of product quality.

[0033] After the stain composition of the present invention is prepared, it is sealed and stored at a temperature of 0 - 5 °C, and the shelf life is 3 - 5 days.

[0034] The present invention has the following beneficial effects:

[0035] The stain composition of the present invention uses mixed animal and vegetable oils to simulate various oil stains on tableware, modified starch to simulate carbohydrates in food residues, minced protein meat to simulate protein-based dirt, and fiber vegetable debris to simulate fiber impurities, which can highly restore the true oil stain condition on the tableware surface and make the evaluation results more practically valuable.

[0036] The stain composition for evaluating the rapid degreasing cleaning power of liquid dishwashing detergents provided by the present invention contains components such as mixed animal and vegetable oils, modified starch, minced protein meat, fiber vegetable debris, and auxiliary agents. In the present invention, the starch is first gelatinized to expose more hydroxyl groups, and then the hydroxyl groups react with the epoxy groups on allyl glycidyl ether to introduce double bonds. Finally, the double bonds polymerize with unsaturated fatty acids and acrylic acid to obtain the modified starch. Unsaturated fatty acids and acrylic acid are introduced into the modified starch. Among them, the unsaturated fatty acids significantly enhance the compatibility between the modified starch and the main component, mixed animal and vegetable oils, which is beneficial to uniform dispersion and improves various properties such as the adhesion and stability of the product. Acrylic acid contains active groups such as carboxyl groups, which can generate intermolecular forces with mixed animal and vegetable oils and intertwine with each other, further improving the adhesion and stability. Specific Embodiments

[0037] In order to more clearly illustrate the technical solutions of the present invention, the following examples are listed. The raw materials, reactions, and post-treatment means appearing in the examples are all common raw materials on the market and technical means well-known to those skilled in the art, unless otherwise specified.

[0038] The terms "preferred", "preferably", "more preferred", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain circumstances. However, in the same circumstances or other circumstances, other embodiments may also be preferred. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not available, nor is it intended to exclude other embodiments from the scope of the present invention.

[0039] It should be understood that, except in any operating examples or otherwise indicated, all numbers representing the amounts of ingredients used in the specification and claims, for example, should be understood to be modified in all cases by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that vary depending upon the desired properties sought to be obtained by the present invention.

[0040] The following raw materials are used in the embodiments of the present invention:

[0041] Animal and plant mixed oil and fat, soybean oil and beef tallow are mixed in a mass ratio of 3:2, meeting the food-grade standard;

[0042] The starch is corn starch with a particle size ≤ 100 μm, meeting the food-grade standard;

[0043] The protein minced meat is fresh chicken;

[0044] The fiber vegetable debris is fresh broccoli debris;

[0045] The unsaturated fatty acid is oleic acid;

[0046] Sodium dodecylbenzenesulfonate, analytical pure, an auxiliary agent;

[0047] Sodium citrate, analytical pure, an auxiliary agent;

[0048] Sodium hydroxide is used as a catalyst, analytical pure;

[0049] Benzoyl peroxide (BPO) is used as an initiator, analytical pure.

[0050] According to the components and mass fractions in Table 1, the stain compositions of Examples 1-3 and Comparative Examples 1-3 are prepared respectively.

[0051] Table 1 Mass fractions of each component of the stain compositions of Examples 1-3 and Comparative Examples 1-3

[0052]

[0053] The preparation method of the stain compositions of the above Examples 1-3 includes the following steps:

[0054] S1. Blend corn starch and distilled water at a mass ratio of 5:95, heat to 70 °C and stir at 250 r / min for 20 min to obtain gelatinized starch;

[0055] S2. Blend the gelatinized starch, allyl glycidyl ether, and sodium hydroxide at a mass ratio of 5:1:0.5, heat to 95 °C and stir and react at 250 r / min for 10 h, cool to room temperature, and adjust the pH to neutral with 10 wt% acetic acid to obtain an intermediate product;

[0056] S3. Blend the intermediate product, oleic acid, acrylic acid, and benzoyl peroxide at a mass ratio of 5:1:1:0.5, heat to 80 °C and stir and react at 250 r / min for 3 h, cool to room temperature to obtain modified starch;

[0057] S4. Add the modified starch, animal and vegetable mixed oil, and deionized water to a container according to the above mass fractions and blend, stir at 1200 r / min for 25 min;

[0058] S5. Add fresh chicken and fresh broccoli scraps to the container in multiple batches (one-third of the mass each time) according to the above mass fractions and blend, stir at 180 r / min for 18 min;

[0059] S6. Add sodium dodecylbenzenesulfonate and sodium citrate to the container according to the above mass fractions and blend, stir at 180 r / min for 12 min, filter using a 100-mesh sieve, pack into a sealed bag and seal and refrigerate to obtain a stain composition for evaluating the fast degreasing cleaning power of liquid dishwashing detergent.

[0060] Comparative Example 1

[0061] The difference between Comparative Example 1 and Example 2 is that step S5 is deleted, and the other components and preparation method are the same as those in Example 2.

[0062] Comparative Example 2

[0063] The difference between Comparative Example 2 and Example 3 is that:

[0064] Delete step S6, and modify step S5 to: Add fresh chicken and fresh broccoli scraps to the container in multiple batches (one-third of the mass each time) according to the above mass fractions and blend, stir at 180 r / min for 18 min, filter using a 100-mesh sieve, pack into a sealed bag and seal and refrigerate to obtain a stain composition for evaluating the fast degreasing cleaning power of liquid dishwashing detergent.

[0065] The other components and preparation method are the same as those in Example 3.

[0066] Comparative Example 3

[0067] The difference between Comparative Example 3 and Example 1 is as follows: Step S3 is deleted, and the modified starch is replaced with an intermediate product, and the other components and preparation method are the same as those in Example 1.

[0068] Test Example 1

[0069] Stain evaluation tests were conducted on the stain compositions of Examples 1-3 and Comparative Examples 1-3 to test their adhesion and density.

[0070] Test method:

[0071] A total of 18 stainless steel sheets with specifications of 80 mm × 50 mm × 2 mm were prepared, with 3 stainless steel sheets set in each group, a total of 6 groups, corresponding to Examples 1-3 and Comparative Examples 1-3. The prepared stain composition was evenly applied on the surface of the stainless steel sheet with an application tool, and the application amount was 3-3.5 g. After application, it was left to age at room temperature (25 °C) for 24 h.

[0072] Density test: After aging, it was cooled to room temperature, and 8 trained evaluators were asked to evaluate the density of the stain on the stainless steel sheet. The main thing was to examine whether a dense dirt scale could be formed on the surface of the stain and whether there were obvious cracks on the surface. They were scored from 1 to 5 points respectively. The higher the score, the better the density of the stain composition applied on the stainless steel sheet. The test result of each group was the average value of the total scores of all samples evaluated by 8 evaluators.

[0073] Adhesion test: Each group of the above-obtained stainless steel sheets was hung in a beaker filled with tap water so that the stain could be completely immersed. After soaking for 90 s, it was dried in an oven at 45 ± 5 °C. 8 trained evaluators were asked to evaluate the adhesion of the stain on the stainless steel sheet. The degree of firm adhesion of the stain on the stainless steel sheet was judged by the stain dropping ratio and scored from 1 to 5 points. The higher the score, the better the adhesion. The test result of each group was the average value of the total scores of all samples evaluated by the evaluators. Among them, if the adhesion ≥ 3.5 points (stain dropping ratio ≤ 30%), it was considered qualified.

[0074] Test results:

[0075] Table 2 shows the test results of the adhesion and density of the stain compositions of Examples 1-3 and Comparative Examples 1-3.

[0076] Table 2 Test results of the adhesion and density of the stain compositions of Examples 1-3 and Comparative Examples 1-3

[0077]

[0078] As can be seen from Table 2, the adhesion and density of the stain compositions in Examples 1-3 are significantly better than those in Comparative Examples 1-3. This is because in Comparative Example 1, fresh chicken and fresh broccoli crumbs were not added, resulting in a decrease in the adhesion and density between stains and between stains and iron sheets, making the stain composition easier to fall off, that is, the adhesion is unqualified and the density is poor; in Comparative Example 2, the additives sodium dodecylbenzenesulfonate and sodium citrate were not added. The non-addition of sodium dodecylbenzenesulfonate reduced the emulsification effect of each component, resulting in a decrease in the uniformity and stability of each component. The non-addition of sodium citrate caused the pH value of the stain composition to deviate from the actual range of the oil stain, unable to simulate the acid-base environment where the actual oil stain is located, and not conducive to maintaining the stability of each component, ultimately leading to a decrease in both density and adhesion; in Comparative Example 3, the modified starch was replaced with an intermediate product, and oleic acid and acrylic acid were not introduced into the starch, resulting in a decrease in the compatibility of each component, easy aggregation and stratification, and a decrease in adhesion and density.

[0079] Test Example 2

[0080] The stain compositions of Examples 1-3 and Comparative Examples 1-3 were evaluated for the cleaning power of detergents.

[0081] Test method:

[0082] The standard swing washing machine used was the RHBX-II type hard surface swing washing machine with a swing frequency of 55 times per minute. Three different brands of liquid dishwashing detergents were prepared and marked as Dishwashing Detergent A (model Liby Fresh Lemon Dishwashing Detergent, purchased from Liby Daily Chemical Co., Ltd.), Dishwashing Detergent B (model Diaopai Lime Dishwashing Detergent, purchased from Nice Group Co., Ltd.), and Dishwashing Detergent C (model Ariel High Efficiency, purchased from Procter & Gamble Co., Ltd.). In addition, a blank group without dishwashing detergent and a standard dishwashing detergent (model National Standard Dishwashing Detergent, purchased from the Research Institute of Daily Chemicals Co., Ltd.) were used for comparison. 18 stainless steel sheets with a specification of 50mm×25mm×3mm were prepared for each dishwashing detergent and the blank group. 15 stainless steel sheets were set for each example and comparative example and tested separately, denoted as 1#, 2#, and 3# respectively. 500 mL of a dishwashing detergent solution with a temperature of 40°C and a concentration of 1% was added to the cleaning device. The stainless steel sheets smeared with stains and aged were placed in the cleaning device, and the device was started to wash for 5 minutes. After the washing was completed, the stainless steel sheets were taken out, rinsed with clean water, hung on an iron sheet rack, placed in a constant temperature drying oven at 45°C, dried for 1 h, cooled to room temperature, weighed and recorded, and the oil stain residue on the surface of the stainless steel sheets was observed and recorded. The cleaning power of the dishwashing detergent was evaluated by calculating the oil stain removal rate. The oil stain removal rate = (the mass of the stain before washing - the mass of the stain after washing) / the mass of the stain before washing × 100%. The higher the removal rate, the better the cleaning power of the detergent.

[0083] Test results:

[0084] Table 3 shows the test results of evaluating the detergency of the stain compositions of Examples 1-3 and Comparative Examples 1-3 with detergents.

[0085] Table 3 Test results of evaluating the detergency of the stain compositions of Examples 1-3 and Comparative Examples 1-3 with detergents (%)

[0086]

[0087]

[0088] As can be seen from Table 3, after evaluating the detergency of the stain compositions with different detergents and calculating the oil removal rate (detergency), it can be found that the removal rates of the stain composition of Example 1 in dishwashing liquids A, B, and C are approximately 70, 62, and 50 respectively. The results of Examples 2 and 3 are close to those of Example 1. That is to say, the detergency of the stain compositions of Examples 1-3 in different detergents is significantly different. Moreover, in the repeated tests of the same dishwashing liquid, the difference in detergency is small and the stain reproducibility is good. In Comparative Example 1, fresh chicken and fresh broccoli crumbs were not added. In Comparative Example 2, the additives sodium dodecylbenzenesulfonate and sodium citrate were not added. In Comparative Example 3, the modified starch was replaced with an intermediate product and oleic acid and acrylic acid were not introduced into the starch, all of which caused a decrease in the properties such as the adhesiveness of the stain composition, resulting in a smaller difference in the detergency of the stain compositions of Comparative Examples 1-3 in different dishwashing liquids than that of Examples 1-3, and a larger fluctuation in detergency in the repeated tests and a poorer stain reproducibility. That is to say, the discrimination of Examples 1-3 when evaluating the detergency of detergents is greater than that of Comparative Examples 1-3, which can effectively distinguish the detergency of different detergents and has better repeatability, and is suitable for evaluating the detergency of detergents.

[0089] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0090] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stain composition for evaluating the rapid degreasing and cleaning power of liquid dishwashing detergent, characterized in that, The stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent comprises the following components by mass fraction: Among them, the modified starch is obtained by first gelatinizing the starch, then reacting it with allyl glycidyl ether, and finally polymerizing it with unsaturated fatty acid and acrylic acid.

2. The stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent according to claim 1, characterized in that, The acid value of the mixed animal and vegetable oils and fats ≤ 3 mg KOH / g.

3. The stain composition for evaluating the rapid oil removal and cleaning power of liquid dishwashing detergent according to claim 1, wherein The starch is selected from one or more of corn starch, potato starch, wheat starch, and oat starch, with a particle size ≤ 100 μm.

4. The stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent according to claim 1, wherein The minced protein meat is selected from one or more of fresh chicken, fresh pork, and fresh beef, with a side length ≤ 3 mm.

5. The stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent according to claim 1, characterized in that, The fiber vegetable debris is selected from one or more of fresh broccoli, fresh spinach, and fresh lettuce, with a side length ≤ 3 mm.

6. The stain composition for evaluating the rapid oil removal and cleaning power of liquid dishwashing detergent according to claim 1, wherein The auxiliary agent is selected from one or more of sodium dodecylbenzenesulfonate and sodium citrate.

7. A method for preparing a stain composition for evaluating the rapid degreasing and cleaning power of liquid dishwashing detergent according to any one of claims 1-6, characterized in that, The preparation method of the stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent comprises the following steps: S1. Blend the starch and distilled water, heat and stir to obtain gelatinized starch; S2. Blend the gelatinized starch, allyl glycidyl ether, and catalyst, heat and stir to react to obtain an intermediate product; S3. Blend the intermediate product, unsaturated fatty acid, acrylic acid, and initiator, heat and stir to react to obtain modified starch; S4. Add the modified starch, mixed animal and vegetable oils and fats, and deionized water into a container and blend them evenly; S5. Add the minced protein meat and fiber vegetable debris into the container and blend them evenly; S6. Add the auxiliary agent into the container and blend them evenly to obtain the stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent.

8. The preparation method of the stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent according to claim 7, characterized in that, In step S1, the temperature of the heating and stirring is 60 - 80°C.

9. The preparation method of the stain composition for evaluating the fast oil-removing cleaning power of liquid dishwashing detergent according to claim 7, characterized in that, In step S2, the mass ratio of the gelatinized starch to allyl glycidyl ether is (4 - 6):1, and the temperature of the heating and stirring reaction is 90 - 100°C.

10. The preparation method of the stain composition for evaluating the rapid oil-removing cleaning power of liquid dishwashing detergent according to claim 7, characterized in that, In step S3, the mass ratio of the intermediate product, unsaturated fatty acid, and acrylic acid is (4 - 6):(1 - 2):(1 - 2), and the temperature of the heating and stirring reaction is 70 - 90°C.

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