A dishwasher detergent having a directional release function and a method of preparing the same

Abstract

The application discloses a dish-washing machine cleaning agent with directional release function and a preparation method thereof, and belongs to the technical field of daily chemical products, which comprises the following components: amphoteric surfactant 0.5-8.0%, non-ionic surfactant 1.0-10.0%, corrosion inhibitor 0.1-8.5%, scale inhibitor 0.1-5.0%, organic acid 5.0-20.0%, modified urea solution 0.7-8.0%, xanthan gum 0.3-2.0%, and deionized water in remainder. Component A in colloidal state is prepared by mixing the modified urea solution and the xanthan gum with water, then the remaining components are uniformly stirred to mix with the organic acid to obtain component B, and component A is heated to above 50 DEG C and then added into component B to mix uniformly, thereby obtaining the dish-washing machine cleaning agent. The modified urea solution and the xanthan gum are compounded to make the cleaning agent in paste form at normal temperature and not easy to dissolve in normal temperature water, the viscosity is reduced under the action of water temperature in the main washing stage, and the cleaning agent is quickly soluble in water, thereby realizing directional release.

Description

Technical Field

[0001] This invention relates to the field of daily chemical products technology, specifically to a dishwasher cleaner with directional release function and its preparation method. Background Technology

[0002] With the innovation and advancement of technology, household dishwashers are becoming increasingly popular, becoming a major household appliance and a necessity for more and more families. Dishwashers also require cleaning and maintenance during daily use to extend their lifespan and ensure effective cleaning. As dishwashers are used over time, more and more limescale and other grime accumulate inside the appliance, hindering its cleaning performance. Limescale buildup on the spray arms, in particular, affects water flow rate and directly impacts cleaning results.

[0003] Currently, most household dishwashers typically have four washing stages: pre-wash, main wash, rinse, and dry. Each stage has different washing times and water temperatures: the pre-wash uses room temperature water and typically lasts less than 15 minutes; the main wash uses water temperatures above 50°C and typically lasts more than 30 minutes. If detergent is added before washing, it can only be used briefly at a low temperature during the pre-wash and is then flushed out with the pre-wash water, significantly reducing cleaning effectiveness. Therefore, adding detergent during the main wash provides the best cleaning effect for the dishwasher tub. Patent CN209789796U uses a wax-sealed bottle to automatically release detergent during the main wash. When the washing water temperature exceeds 50°C, the wax at the bottle's opening melts, releasing the detergent to participate in the main wash. However, this wax-sealed bottle is disposable, resulting in significant plastic waste and failing to meet economic and environmental requirements.

[0004] Therefore, it is essential to develop a dishwasher detergent that can be released in a targeted manner during the main wash stage to improve the washing effect, as well as its preparation method. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a dishwasher cleaner with a directional release function. This cleaner is formulated with modified urea solution and xanthan gum to achieve a suitable viscosity. It is paste-like at room temperature and not easily soluble in room temperature water. During the main wash stage, the viscosity decreases under the influence of water temperature and it quickly becomes miscible with water, thereby achieving the directional release of the cleaner.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0007] A dishwasher cleaner with directional release function comprises the following components by weight percentage: 0.5-8.0% amphoteric surfactant, 1.0-10.0% nonionic surfactant, 0.1-8.5% corrosion inhibitor, 0.1-5.0% scale inhibitor, 5.0-20.0% organic acid, 0.7-8.0% modified urea solution, 0.3-2.0% xanthan gum, and the balance being deionized water.

[0008] In a preferred embodiment of the present invention, the amphoteric surfactant is at least one of the following: GENAMINOX® MY surfactant manufactured by Clariant, MIRANOL®C2M CONC NP surfactant manufactured by Solvay, and TEGOTENS DO surfactant manufactured by Evonik.

[0009] In a preferred embodiment of the present invention, the nonionic surfactant is at least one of the following: BEROL® 611 (manufactured by Nouryon), BEROL® 226 (manufactured by Nouryon), and CC9NS (manufactured by Evonik).

[0010] In a preferred embodiment of the present invention, the corrosion inhibitor is at least one of benzotriazole, 2-butane-1,2,4-tricarboxylic acid phosphate, and trisodium methylglycine diacetate.

[0011] In a preferred embodiment of the present invention, the scale inhibitor is at least one of hydroxyethylidene diphosphonic acid, polyacrylic acid, and aminotrimethylene phosphonic acid.

[0012] In a preferred embodiment of the present invention, the organic acid is at least one of methanesulfonic acid, aminosulfonic acid, citric acid, lactic acid, and glycolic acid.

[0013] A second objective of this invention is to provide a method for preparing the dishwasher cleaning agent as described above, comprising the following steps:

[0014] S1. Preparation of component A: After mixing and dispersing the modified urea solution with xanthan gum evenly, add some deionized water and stir rapidly to obtain component A in a colloidal state.

[0015] S2. Preparation of component B: Mix the amphoteric surfactant, nonionic surfactant, corrosion inhibitor, scale inhibitor and remaining deionized water evenly, add organic acid, mix and stir until evenly mixed to obtain component B.

[0016] S3. Preparation of cleaning agent: Heat component A to above 50°C, add component B, stir quickly and evenly, and then cool to obtain the dishwasher cleaning agent.

[0017] In a preferred embodiment of the present invention, the stirring speed in step S1 is ≥1000 r / min and the stirring time is 10~30 min.

[0018] In a preferred embodiment of the present invention, the stirring speed in step S2 is 500~1000 r / min and the stirring time is 10~20 min.

[0019] In a preferred embodiment of the present invention, the stirring speed in step S3 is 500~1000 r / min and the stirring time is 20~40 min.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention combines a modified urea solution with xanthan gum to form component A. Component A imparts a suitable viscosity to component B, making it a paste-like substance at room temperature that is not easily soluble in water. During the main wash cycle, at a water temperature above 50°C, the viscosity of the cleaning agent decreases, allowing it to flow directionally into the dishwasher tub and quickly dissolve in water. This enables the cleaning agent to fully exert its cleaning effect during the main wash cycle, thereby achieving the goal of cleaning scale and grease from the dishwasher tub. Attached Figure Description

[0022] Figure 1 This is a graph showing the relationship between water temperature and detergent retention for the cleaning agents prepared in Examples 1-5 and Comparative Examples 1-4 of the present invention. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] A dishwasher cleaner with directional release function comprises the following components by weight percentage: 0.5-8.0% amphoteric surfactant, 1.0-10.0% nonionic surfactant, 0.1-8.5% corrosion inhibitor, 0.1-5.0% scale inhibitor, 5.0-20.0% organic acid, 0.7-8.0% modified urea solution, 0.3-2.0% xanthan gum, and the balance being deionized water.

[0025] In the above formulation, modified urea solution and xanthan gum are rheology modifiers. The combination of modified urea solution and xanthan gum results in a paste-like state of the cleaning agent at room temperature. During the main wash cycle, the viscosity decreases under the influence of water temperature, and the agent rapidly dissolves in water, thus achieving targeted release of the cleaning agent. Nonionic surfactants play a primary cleaning role, removing residual grease and grime from the dishwasher. The preferred nonionic surfactants are at least one of the following: BEROL® 611 (Noryon), BEROL® 226 (Noryon), and CC9NS (Evonik). Amphoteric surfactants not only synergize with nonionic surfactants in terms of detergency but also stabilize the rheology-modified state. The preferred amphoteric surfactants are at least one of the following: GENAMINOX® MY (Clariant), MIRANOL® C2M CONC NP (Solvay), and TEGOTENS DO (Evonik). Corrosion inhibitors are used to reduce the surface corrosion of metal parts in the dishwasher's inner tub by acidic systems, thus protecting the surface of the metal parts and leaving it looking brand new after cleaning. The preferred corrosion inhibitor is at least one of benzotriazole, butane-1,2,4-tricarboxylic acid 2-phosphate, or trisodium methylglycine diacetate. Scale inhibitors act as scale inhibitors and prevent redeposition. The preferred scale inhibitor is at least one of hydroxyethylidene diphosphonic acid, polyacrylic acid, or aminotrimethylene phosphonic acid. Organic acids are used to remove various calcium deposits or solid scale that accumulate on the heating coil and affect heating efficiency. The organic acid is at least one of methanesulfonic acid, aminosulfonic acid, citric acid, lactic acid, or glycolic acid.

[0026] The preparation method of the above dishwasher cleaner includes the following steps:

[0027] S1. Preparation of Component A: After mixing and dispersing the modified urea solution with xanthan gum evenly, add a portion of deionized water and stir rapidly at a speed ≥1000 r / min for 10~30 min to obtain component A in a colloidal state. Xanthan gum powder tends to agglomerate upon contact with water, making it difficult to disperse at low stirring speeds, resulting in a particulate aqueous solution. Therefore, pre-mixing the modified urea solution and xanthan gum evenly before adding them to room temperature water and increasing the stirring speed allows the xanthan gum to disperse well, swell rapidly, and form a colloidal state.

[0028] S2. Preparation of component B: Mix the amphoteric surfactant, nonionic surfactant, corrosion inhibitor, scale inhibitor and remaining deionized water evenly, add organic acid, mix and stir at a speed of 500~1000 r / min for 10~20 min to make it evenly mixed, and obtain component B.

[0029] S3. Preparation of cleaning agent: Heat component A to above 50°C, its colloidal state becomes thinner, and it can be quickly and evenly mixed with component B; add component B, stir quickly at a stirring speed of 500~1000 r / min for 20~40 min, and after it is evenly mixed, cool to room temperature to obtain a high-viscosity uniform paste, which is the dishwasher cleaning agent. Example

[0030] A dishwasher cleaner with directional release function comprises the following components by weight percentage: 3.0% amphoteric surfactant (GENAMINOX® MY), 5.0% nonionic surfactant (BEROL® 611), 2.5% benzotriazole, 3.0% hydroxyethylidene diphosphonic acid, 15.0% methanesulfonic acid, 1.0% modified urea solution (RHEOBYK 7420 ES), 0.8% xanthan gum, and 69.7% deionized water.

[0031] The preparation method of the above-mentioned dishwasher cleaner includes the following steps:

[0032] S1. Preparation of component A: After mixing and dispersing the modified urea solution with xanthan gum evenly, add 48.2% by weight of deionized water and stir rapidly at a speed of 1300 r / min for 20 min to obtain component A in a colloidal state.

[0033] S2. Preparation of component B: Amphoteric surfactant, nonionic surfactant, benzotriazole, hydroxyethylidene diphosphonic acid and 21.5% by weight of deionized water are added and stirred evenly. Methylsulfonic acid is added and mixed and stirred at a speed of 500 r / min for 20 min to make it evenly mixed to obtain component B.

[0034] S3. Preparation of cleaning agent: Heat component A to above 50°C, its colloidal state becomes thinner, and it can be quickly and evenly mixed with component B; add component B, stir quickly at a stirring speed of 700 r / min for 40 min, and after it is evenly mixed, cool to room temperature to obtain a high-viscosity uniform paste, which is the dishwasher cleaning agent. Example

[0035] A dishwasher cleaner with directional release function comprises the following components by weight percentage: 8.0% amphoteric surfactant (GENAMINOX® MY), 1.0% nonionic surfactant (BEROL® 611), 1.0% benzotriazole, 0.1% hydroxyethylidene diphosphonic acid, 5.0% methanesulfonic acid, 0.7% modified urea solution (RHEOBYK 7420 ES), 0.3% xanthan gum, and 83.9% deionized water.

[0036] The preparation method of the above-mentioned dishwasher cleaner includes the following steps:

[0037] S1. Preparation of component A: After mixing and dispersing the modified urea solution with xanthan gum evenly, add 49% by weight of deionized water and stir rapidly at a stirring speed of 1300 r / min for 20 min to obtain component A in a colloidal state.

[0038] S2. Preparation of component B: Amphoteric surfactant, nonionic surfactant, benzotriazole, hydroxyethylidene diphosphonic acid and deionized water at a weight percentage of 34.9% were added and stirred evenly. Methylsulfonic acid was added and the mixture was stirred at a speed of 500 r / min for 20 min to make it evenly mixed to obtain component B.

[0039] S3. Preparation of cleaning agent: Heat component A to above 50°C, its colloidal state becomes thinner, and it can be quickly and evenly mixed with component B; add component B, stir quickly at a stirring speed of 700 r / min for 40 min, and after it is evenly mixed, cool to room temperature to obtain a high-viscosity uniform paste, which is the dishwasher cleaning agent. Example

[0040] A dishwasher cleaner with directional release function comprises the following components by weight percentage: 3.0% amphoteric surfactant (GENAMINOX® MY), 5.0% nonionic surfactant (BEROL® 611), 2.5% benzotriazole, 5.0% hydroxyethylidene diphosphonic acid, 20.0% methanesulfonic acid, 8.0% modified urea solution (RHEOBYK 7420 ES), 2.0% xanthan gum, and 54.5% deionized water.

[0041] The preparation method of the above-mentioned dishwasher cleaner includes the following steps:

[0042] S1. Preparation of component A: After mixing and dispersing the modified urea solution with xanthan gum evenly, add 40.0% by weight of deionized water and stir rapidly at a speed of 1300 r / min for 20 min to obtain component A in a colloidal state.

[0043] S2. Preparation of component B: Amphoteric surfactant, nonionic surfactant, benzotriazole, hydroxyethylidene diphosphonic acid and 14.5% by weight of deionized water are added and stirred evenly. Methylsulfonic acid is added and mixed and stirred at a speed of 500 r / min for 20 min to make it evenly mixed to obtain component B.

[0044] S3. Preparation of cleaning agent: Heat component A to above 50°C, its colloidal state becomes thinner, and it can be quickly and evenly mixed with component B; add component B, stir quickly at a stirring speed of 700 r / min for 40 min, and after it is evenly mixed, cool to room temperature to obtain a high-viscosity uniform paste, which is the dishwasher cleaning agent. Example

[0045] A dishwasher cleaner with directional release function comprises the following components by weight percentage: 3.0% amphoteric surfactant (GENAMINOX® MY), 5.0% nonionic surfactant (BEROL® 611), 2.5% benzotriazole, 3.0% hydroxyethylidene diphosphonic acid, 10.0% aminosulfonic acid, 1.0% modified urea solution (RHEOBYK 7420 ES), 0.8% xanthan gum, and 74.7% deionized water.

[0046] The preparation method of the above-mentioned dishwasher cleaner includes the following steps:

[0047] S1. Preparation of component A: After mixing and dispersing the modified urea solution with xanthan gum evenly, add 48.2% by weight of deionized water and stir rapidly at a speed of 1300 r / min for 20 min to obtain component A in a colloidal state.

[0048] S2. Preparation of component B: Amphoteric surfactant, nonionic surfactant, benzotriazole, hydroxyethylidene diphosphonic acid and 16.5% by weight of deionized water are added and stirred evenly. Aminosulfonic acid is added and mixed and stirred at a speed of 500 r / min for 20 min to make it evenly mixed to obtain component B.

[0049] S3. Preparation of cleaning agent: Heat component A to above 50°C, its colloidal state becomes thinner, and it can be quickly and evenly mixed with component B; add component B, stir quickly at a stirring speed of 700 r / min for 40 min, and after it is evenly mixed, cool to room temperature to obtain a high-viscosity uniform paste, which is the dishwasher cleaning agent. Example

[0050] A dishwasher cleaner with directional release function comprises the following components by weight percentage: 3.0% amphoteric surfactant (GENAMINOX® MY), 5.0% nonionic surfactant (BEROL® 611), 2.5% benzotriazole, 3.0% hydroxyethylidene diphosphonic acid, 20.0% citric acid, 1.0% modified urea solution (RHEOBYK 7420 ES), 0.8% xanthan gum, and 64.7% deionized water.

[0051] The preparation method of the above-mentioned dishwasher cleaner includes the following steps:

[0052] S1. Preparation of component A: After mixing and dispersing the modified urea solution with xanthan gum evenly, add 48.2% by weight of deionized water and stir rapidly at a speed of 1300 r / min for 20 min to obtain component A in a colloidal state.

[0053] S2. Preparation of component B: Amphoteric surfactant, nonionic surfactant, benzotriazole, hydroxyethylidene diphosphonic acid and 16.5% by weight of deionized water are added and stirred evenly. Citric acid is added and the mixture is stirred at a speed of 500 r / min for 20 min to make it evenly mixed to obtain component B.

[0054] S3. Preparation of cleaning agent: Heat component A to above 50°C, its colloidal state becomes thinner, and it can be quickly and evenly mixed with component B; add component B, stir quickly at a stirring speed of 700 r / min for 40 min, and after it is evenly mixed, cool to room temperature to obtain a high-viscosity uniform paste, which is the dishwasher cleaning agent.

[0055] Comparative Example 1:

[0056] A dishwasher cleaner comprising the following components by weight percentage: 3.0% amphoteric surfactant (GENAMINOX® MY), 5.0% nonionic surfactant (BEROL® 611), 2.5% benzotriazole, 3.0% hydroxyethylidene diphosphonic acid, 15.0% methanesulfonic acid, and 71.5% deionized water.

[0057] The preparation method of the above-mentioned dishwasher cleaner includes the following steps:

[0058] Amphoteric surfactant, nonionic surfactant, benzotriazole, hydroxyethylidene diphosphonic acid, and 21.5% by weight of deionized water were mixed evenly. Methylsulfonic acid was then added, and the mixture was stirred at a speed of 500 r / min for 20 min to ensure uniform mixing, thus obtaining the dishwasher cleaning agent.

[0059] Comparative Example 2:

[0060] A dishwasher cleaner comprising the following components by weight percentage: 3.0% amphoteric surfactant (GENAMINOX® MY), 5.0% nonionic surfactant (BEROL® 611), 2.5% benzotriazole, 3.0% hydroxyethylidene diphosphonic acid, 15.0% methanesulfonic acid, 1.0% modified urea solution (RHEOBYK 7420 ES), and 70.5% deionized water.

[0061] The preparation method of the above-mentioned dishwasher cleaner includes the following steps:

[0062] S1. Preparation of component A: The modified urea solution was added to 49% (w / w) of deionized water and stirred rapidly at a speed of 1300 r / min for 20 min to obtain component A.

[0063] S2. Preparation of component B: Amphoteric surfactant, nonionic surfactant, benzotriazole, hydroxyethylidene diphosphonic acid and 21.5% by weight of deionized water are added and stirred evenly. Methylsulfonic acid is added and mixed and stirred at a speed of 500 r / min for 20 min to make it evenly mixed to obtain component B.

[0064] S3. Preparation of cleaning agent: Heat component A to above 50°C, its colloidal state becomes thinner, and it can be quickly and evenly mixed with component B; add component B, stir quickly at a stirring speed of 700 r / min for 40 min, and after it is evenly mixed, cool to room temperature to obtain dishwasher cleaning agent.

[0065] Comparative Example 3:

[0066] A dishwasher cleaner comprising the following components by weight percentage: 3.0% amphoteric surfactant (GENAMINOX® MY), 5.0% nonionic surfactant (BEROL® 611), 2.5% benzotriazole, 3.0% hydroxyethylidene diphosphonic acid, 15.0% methanesulfonic acid, 0.8% xanthan gum, and 70.7% deionized water.

[0067] The preparation method of the above-mentioned dishwasher cleaner includes the following steps:

[0068] S1. Preparation of component A: Xanthan gum was added to deionized water at a weight percentage of 49.2% and stirred rapidly at a speed of 1300 r / min for 20 min to obtain component A in a colloidal state.

[0069] S2. Preparation of component B: Amphoteric surfactant, nonionic surfactant, benzotriazole, hydroxyethylidene diphosphonic acid and 21.5% by weight of deionized water are added and stirred evenly. Methylsulfonic acid is added and mixed and stirred at a speed of 500 r / min for 20 min to make it evenly mixed to obtain component B.

[0070] S3. Preparation of cleaning agent: Heat component A to above 50°C, its colloidal state becomes thinner, and it can be quickly and evenly mixed with component B; add component B, stir quickly at a stirring speed of 700 r / min for 40 min, and after it is evenly mixed, cool to room temperature to obtain dishwasher cleaning agent.

[0071] Comparative Example 4:

[0072] A dishwasher cleaner comprising the following components by weight percentage: 3.0% amphoteric surfactant (GENAMINOX® MY), 5.0% nonionic surfactant (BEROL® 611), 2.5% benzotriazole, 3.0% hydroxyethylidene diphosphonic acid, 1.0% modified urea solution (RHEOBYK 7420 ES), 0.8% xanthan gum, and 84.7% deionized water.

[0073] The preparation method of the above-mentioned dishwasher cleaner includes the following steps:

[0074] S1. Preparation of component A: After mixing and dispersing the modified urea solution with xanthan gum evenly, add 48.2% by weight of deionized water and stir rapidly at a speed of 1300 r / min for 20 min to obtain component A in a colloidal state.

[0075] S2. Preparation of component B: Amphoteric surfactant, nonionic surfactant, benzotriazole, hydroxyethylidene diphosphonic acid and 36.5% by weight of deionized water are added and stirred evenly. The mixture is stirred at a speed of 500 r / min for 20 min to obtain component B.

[0076] S3. Preparation of cleaning agent: Heat component A to above 50°C, its colloidal state becomes thinner, and it can be quickly and evenly mixed with component B; add component B, stir quickly at a stirring speed of 700 r / min for 40 min, and after it is evenly mixed, cool to room temperature to obtain dishwasher cleaning agent.

[0077] Performance Verification Test 1: Detergent Content Retention Rate at Different Water Temperatures

[0078] The dishwasher detergents prepared in Examples 1-5 and Comparative Examples 1-4 were tested for their content retention rate at different water temperatures. The specific test methods are as follows: Simulating the conditions before a dishwasher pre-wash, 20 grams of detergent were squeezed onto a 6cm*6cm glass slide, weighed (A). The slide was then immersed in water at 20℃, 30℃, 40℃, and 50℃ for 15 minutes. After removal, the slides were allowed to air dry at room temperature overnight and weighed again. The retained detergent content was calculated using the following formula:

[0079] The cleaning agent content X% = B / A * 100%.

[0080] The results are shown in Table 1 and Figure 1 As shown.

[0081] Table 1. Content retention rate of dishwasher detergent at different water temperatures in Examples 1-5 and Comparative Examples 1-4

[0082]

[0083] From Table 1 and Figure 1 The results of Examples 1-5 show that in the presence of modified urea solution and xanthan gum, more than 60% of the detergent can be retained when the temperature reaches 40°C, and when the water temperature reaches 50°C, the detergent is completely released after soaking for 15 minutes. However, Comparative Examples 1-3 show that if either the modified urea solution or xanthan gum is missing, it will be quickly diluted by the aqueous solution and consumed during the pre-wash stage at low or room temperature, ultimately failing to achieve its full cleaning effect during the main wash stage.

[0084] Performance Verification Test 2: Descaling and Degreasing Ability

[0085] The descaling and degreasing abilities of the dishwasher cleaning agents prepared in Examples 1-5 and Comparative Examples 1-4 were determined under the same conditions. The specific test methods are as follows:

[0086] 1. Scale preparation: Take sodium carbonate, magnesium sulfate and calcium chloride and place them in beakers respectively. Place 4 transparent glass plates *15cm*20cm in the dishwasher, turn on the super fast wash mode, and repeat the above wash 10 times. Set aside for use.

[0087] 2. Place 20 grams of grease (prepared according to the method for preparing grease in Appendix GB9985) at the bottom of the dishwasher, then squeeze 20 grams of detergent into the dishwasher detergent dispenser and start the super-fast wash cycle. Afterwards, score the glass slide. Evaluate the residual grease and calcium deposits on the glass slide by visual inspection: 5 points for completely clean grease; 4 points for fewer than 4 grease spots and a total grease area ≤ 4 mm²; 3 points for fewer than 10 grease spots and a total grease area ≤ 4 mm²; 2 points for more than 10 grease spots and a total grease area ≤ 50 mm²; 0 points for a total grease area > 50 mm².

[0088] The results are shown in Table 2.

[0089] Table 2 Comparison of the descaling and stain removal capabilities of dishwasher cleaning agents in Examples 1-5 and Comparative Examples 1-4

[0090]

[0091] As shown in Tables 1 and 2, Examples 1-5 demonstrate that the dishwasher detergent retains 70% of its content at temperatures below 50°C, and its cleaning ability consistently scores above 4, effectively cleaning limescale and grease from the dishwasher. Furthermore, methanesulfonic acid exhibits superior cleaning ability compared to sulfamic acid and citric acid. Although the detergent in Comparative Example 4 retains 80% of its content, its primary cleaning acidic component was not added, resulting in a cleaning ability rating of 0.

[0092] In summary, this invention, by combining modified urea solution and xanthan gum, gives the cleaning agent a suitable viscosity. At room temperature, it is a paste and not easily soluble in room temperature water. During the main wash stage, the viscosity decreases under the influence of water temperature and it quickly becomes miscible with water, thereby achieving the targeted release of the cleaning agent.

[0093] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A dishwasher cleaner with directional release function, characterized in that: It comprises the following components by weight percentage: 0.5-8.0% amphoteric surfactant, 1.0-10.0% nonionic surfactant, 0.1-8.5% corrosion inhibitor, 0.1-5.0% scale inhibitor, 5.0-20.0% organic acid, 0.7-8.0% modified urea solution, 0.3-2.0% xanthan gum, and the balance being deionized water; The amphoteric surfactant is GENAMINOX® MY manufactured by Clariant, the nonionic surfactant is BEROL® 611 manufactured by Nouryon, the corrosion inhibitor is benzotriazole, the scale inhibitor is hydroxyethylidene diphosphonic acid, and the organic acid is methanesulfonic acid, aminosulfonic acid, or citric acid; the modified urea solution is RHEOBYK 7420 ES; the dishwasher cleaner is a paste at room temperature and is not easily soluble in water.

2. A method for preparing a dishwasher cleaning agent as described in claim 1, characterized in that: Includes the following steps: S1. Preparation of component A: After mixing and dispersing the modified urea solution with xanthan gum evenly, add some deionized water and stir rapidly to obtain component A in a colloidal state. S2. Preparation of component B: Mix the amphoteric surfactant, nonionic surfactant, corrosion inhibitor, scale inhibitor and remaining deionized water evenly, add organic acid, mix and stir until evenly mixed to obtain component B. S3. Preparation of cleaning agent: Heat component A to above 50°C, add component B, stir quickly and evenly, and then cool to obtain the dishwasher cleaning agent.

3. The method for preparing the dishwasher cleaning agent according to claim 2, characterized in that: In step S1, the stirring speed is ≥1000 r / min and the stirring time is 10~30 min.

4. The method for preparing the dishwasher cleaning agent according to claim 2, characterized in that: The stirring speed in step S2 is 500~1000 r / min and the stirring time is 10~20 min.

5. The method for preparing the dishwasher cleaning agent according to claim 2, characterized in that: The stirring speed in step S3 is 500~1000 r / min and the stirring time is 20min~40min.

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