Descaling type dish washing detergent for dish washing machine and preparation method thereof

Abstract

The invention relates to the technical field of detergents, in particular to a dishwashing detergent for a descaling dishwasher and a preparation method of the dishwashing detergent, and the dishwashing detergent comprises non-fibrous components such as ethylene diamine tetraacetic acid, sodium hydroxide, sodium citrate, sodium polyacrylate, fatty alcohol-polyoxyethylene ether AEO-3 and the like. By optimizing the formula design, the problems of alkali scale and water scale residues are solved, phosphate is not contained, the efficient descaling capacity is achieved, and meanwhile the environmental protection performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of detergent technology, specifically a scale-removing type of dishware detergent for dishwashers and a preparation method thereof. BACKGROUND

[0002] Dishware detergent for dishwashers is a chemical preparation used to remove stains from the surface of dishware and improve cleaning effectiveness. With the popularization of dishwashers, there is an increasing demand for high-efficiency, environmentally friendly, and scale-removing detergents. Existing dishware detergents for dishwashers have certain limitations in softening water quality, removing stubborn stains, and preventing scale deposition, and consumers' demand for long-term maintenance of dishware cleanliness has not been fully met.

[0003] A manufacturing method of an automatic dishwashing detergent product with publication number CN106661508B and publication date February 7, 2020. This patent forms a polymer builder through free radical polymerization, and combines non-ionic surfactants and acrylic monomers to prepare a non-aqueous gel phase detergent product. However, this technical solution does not fully consider the problem of alkaline scale and scale residue that may occur during long-term use of the detergent, especially under hard water conditions. In addition, the non-aqueous gel phase preparation process in this solution is complex, which may lead to an increase in production costs and high requirements for equipment, which is not conducive to large-scale promotion.

[0004] A liquid detergent with publication number CN116096848B and publication date June 13, 2025. This patent adds inorganic alkali agents and specific structuring agents (such as bacterial cellulose and compounds represented by general formula (1)) to make the detergent have good stability under low water content. However, this technical solution mainly optimizes the structuring performance of the liquid detergent and pays less attention to the scale removal ability, especially in hard water environments, which may not effectively prevent scale deposition. In addition, some structuring agents used in this solution may have potential environmental impact after long-term use, which does not meet the requirements of green and environmentally friendly.

[0005] The above problems show that there is still room for improvement in existing dishware detergents for dishwashers in terms of preventing alkaline scale and scale residue, improving scale removal ability, etc. Therefore, the present application provides a scale-removing type of dishware detergent for dishwashers and a preparation method thereof, aiming to optimize the formula design and improve the scale removal effect of the detergent to reduce alkaline scale and scale residue. SUMMARY

[0006] The present application aims to provide a scale-removing type of dishware detergent for dishwashers and a preparation method thereof to solve the problems raised in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a descaling dishwasher dishwashing detergent, characterized in that it comprises the following components: disodium ethylenediaminetetraacetate as a chelating agent, with a content of 1%; 99% sodium hydroxide as an alkalinity regulator, with a content of 3%; sodium citrate as a softener, with a content of 15%; 40% sodium polyacrylate as a dispersant, with a content of 2%; fatty alcohol polyoxyethylene ether AEO-3 as a surfactant, with a content of 10%; ethanol as a solvent, with a content of 3%; and triethanolamine as a pH regulator, with a content of 2%, wherein each component is a non-fibrous structure and forms a uniform and stable system through intermolecular forces.

[0008] Preferably, the detergent is transparent or semi-transparent.

[0009] Preferably, it also contains colorants or fragrances to improve appearance or smell.

[0010] Preferably, the surfactant is selected from fatty alcohol polyoxyethylene ether AEO-3 or sodium lauryl sulfate.

[0011] Preferably, the carrier layer is composed of a material selected from the group consisting of polyethylene terephthalate, plasticized vinyl acetate-vinyl chloride copolymer, nylon, ethylene-vinyl acetate copolymer, plasticized polyvinyl chloride, polyurethane, polyvinylidene chloride, polypropylene, polyethylene, or polyamide.

[0012] A method for preparing a detergent includes the following steps:

[0013] S001: A carrier layer that is impermeable to active substances is combined with a non-fibrous dispersion layer;

[0014] S002: A separately formulated, free-flowing formulation containing active substances is coated onto a dispersion layer by a dispersion method.

[0015] S003: In a further step, a non-fibrous carrier layer impermeable to the active substance is coated onto a dispersion layer containing the active substance.

[0016] Preferably, the dispersion method transfers the formulation containing the active substance onto a non-fibrous carrier layer via a distribution plate of a coating device. The viscosity of the formulation containing the active substance is in the range of 10 to 100 dPa·s. Before or after coating the formulation containing the active substance, the detergent can be made into a single dose by cutting or punching from the composite laminate that has already been formed.

[0017] Preferably, the active substance is selected from the group consisting of sodium percarbonate, sodium perborate, sodium hypochlorite, citric acid, lactic acid, malic acid, tartaric acid, sodium gluconate, sodium silicate, sodium carbonate, potassium carbonate, sodium sulfate, and potassium sulfate.

[0018] Preferably, the dispersion method is carried out at room temperature, and the viscosity of the mixture is controlled by adjusting the ratio of the active substance to the dispersant. The dispersion medium comprises a chelating agent based on disodium ethylenediaminetetraacetate and sodium citrate, and a dispersant based on sodium polyacrylate and fatty alcohol polyoxyethylene ether AEO-3.

[0019] Preferably, the active substance is a liquid or solid at room temperature, and its viscosity is adjusted by adding a solvent to achieve uniform dispersion.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the descaling dishwasher detergent and its preparation method:

[0021] The detergent provided by this invention exhibits excellent descaling effect and stability. Its phosphate-free design meets environmental protection requirements, and through optimized formulation and preparation processes, it effectively solves the problems of alkaline scale and limescale residue present in existing technologies. In practical applications, this detergent can adapt to washing needs under different water quality conditions and significantly improves the cleaning efficiency and lifespan of dishwashers. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention have been clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention provides a descaling dishwasher detergent and its preparation method. The following will describe in detail the specific implementation process of this detergent, in conjunction with the formulation design and preparation process described in the invention. During the implementation process, the selection criteria, proportioning principles, and specific preparation steps of each component will be explained one by one, and its operating principle and practical application scenarios will be further elaborated.

[0024] Firstly, the core of this invention lies in achieving highly efficient descaling capabilities and reducing the deposition of alkaline and limescale through optimized formulation design. To achieve this, the detergent contains disodium ethylenediaminetetraacetate (EDTA) as a chelating agent, at a content of 1%. Disodium EDTA exists in crystalline form and, upon dissolving in water, forms stable complexes with calcium and magnesium ions, thereby effectively inhibiting limescale formation. Furthermore, 99% sodium hydroxide, at a content of 3%, acts as an alkalinity regulator to adjust the pH value of the detergent system, enabling it to better remove grease and oil stains. Sodium hydroxide maintains a uniform distribution with other components in the system through intermolecular forces, ensuring the overall stability of the detergent's performance.

[0025] Sodium citrate, as a water softener, is present at a concentration of 15%. Added in powder form, its main function is to reduce water hardness and scale formation by reacting with calcium and magnesium ions in hard water to form soluble salts. Sodium polyacrylate, at a concentration of 2%, is added in liquid form and thoroughly mixed with the other components in the system. Sodium polyacrylate exhibits good dispersing properties, preventing particle aggregation and improving detergent stability. Fatty alcohol polyoxyethylene ether (AEO-3), at a concentration of 10%, is added in liquid form to reduce surface tension and enhance detergency. AEO-3 exhibits a non-fibrous structure in the system and forms a homogeneous system through physical mixing with other components.

[0026] Ethanol, at a concentration of 3%, is added in liquid form to adjust the viscosity of the system and promote homogeneous mixing of the components. Triethanolamine, at a concentration of 2%, is added in liquid form to further fine-tune the pH of the system, keeping it within a suitable range. These components are all non-fibrous structures at the microscopic scale, including granular, flake-like, or liquid compounds, which are combined through physical mixing or chemical reactions to form a homogeneous and stable detergent system.

[0027] In the preparation process, disodium ethylenediaminetetraacetate and sodium citrate are first mixed at a mass ratio of 1:15. The mixing process is carried out at room temperature, using a stirrer at low speed for 5 minutes to ensure sufficient contact between the two components and the initial formation of a homogeneous mixture. Then, 99% sodium hydroxide is slowly added to the mixture while maintaining a constant stirring speed for 10 minutes, until the sodium hydroxide is completely dissolved and forms a stable system with the other components. During this process, the rate of addition of sodium hydroxide must be strictly controlled to avoid localized overheating that could lead to system instability.

[0028] Next, add 40% sodium polyacrylate to the system in small, multiple additions, stirring for 3 minutes after each addition until all sodium polyacrylate is completely dispersed. Then, slowly add fatty alcohol polyoxyethylene ether AEO-3 to the system while increasing the stirring speed to medium and stirring continuously for 15 minutes to ensure that the surfactant is fully mixed with the other components and forms a homogeneous liquid phase. During this process, it is important to control the stirring speed and time to avoid system stratification due to excessive shear force.

[0029] Subsequently, ethanol and triethanolamine were pre-mixed at a mass ratio of 3:2 to form a solvent mixture. This solvent mixture was slowly added to the above system while maintaining medium-speed stirring for 10 minutes until the system was completely transparent and showed no obvious layering. The final detergent was transparent or translucent, and the components formed a homogeneous and stable system through intermolecular forces.

[0030] Furthermore, sodium citrate reacts with calcium and magnesium ions in hard water to form soluble salts, further reducing water hardness and scale formation. Sodium polyacrylate, through its dispersing properties, prevents particle aggregation, ensuring the detergent maintains uniform and stable performance throughout the washing process. Sodium hydroxide and triethanolamine work together to adjust the pH of the system, keeping it within a suitable range, thereby enhancing the removal of grease stains. Ethanol, as a solvent, not only promotes uniform mixing between the components but also improves the detergent's fluidity, making it easier to disperse in the dishwasher.

[0031] Furthermore, to meet consumers' personalized needs, appropriate amounts of colorants or fragrances can be added to detergents. For example, adding blue or green colorants can make the detergent transparent or semi-transparent, thereby enhancing the product's aesthetics and appeal. At the same time, adding lemon or mint fragrances can improve the detergent's scent, making it more in line with consumer preferences.

[0032] During the production process, a dispersion method is used to uniformly distribute the active ingredient onto a non-fibrous carrier layer. Specifically, the formulation containing the active ingredient is transferred to the non-fibrous carrier layer through a distribution plate of a coating device, ensuring that the active ingredient forms a uniform dispersion layer on the carrier layer. Subsequently, a non-fibrous carrier layer impermeable to the active ingredient is applied over the dispersion layer, thereby completely encapsulating the active ingredient within the composite laminate tablet. During the coating process, the coating speed and temperature must be strictly controlled to ensure the uniform distribution of the active ingredient and the stability of the system.

[0033] During the cutting and stamping process, the composite laminate is cut into single-dose detergent tablets, each weighing approximately 20 grams to meet the needs of a single wash. The cut detergent tablets undergo quality inspection, including visual inspection, component analysis, and performance testing, to ensure they meet relevant standards. For packaging, transparent polyethylene terephthalate (PET) material is used to enhance the product's visual appeal and increase consumer trust.

[0034] Through the above preparation method and practical application tests, it can be demonstrated that the detergent provided by this invention has excellent descaling effect and stability. Its phosphate-free design meets environmental protection requirements, and through optimized formulation design and preparation process, it effectively solves the problems of alkaline scale and limescale residue existing in existing technologies. In practical applications, this detergent can adapt to washing needs under different water quality conditions and significantly improves the cleaning efficiency and service life of dishwashers.

[0035] To enable those skilled in the art to fully understand and implement this invention, the specific implementation principle of this invention is further explained below in conjunction with a specific application scenario.

[0036] In actual operation, disodium ethylenediaminetetraacetate (EDTA) and sodium citrate are first mixed at a mass ratio of 1:15. In this step, the EDTA exists in crystalline form and is stirred at low speed for 5 minutes to ensure sufficient contact with the sodium citrate and the initial formation of a homogeneous mixture. The core of this process lies in utilizing the chelating properties of EDTA, allowing it to rapidly form stable complexes with calcium and magnesium ions in hard water upon subsequent dissolution, thereby effectively inhibiting scale formation. Simultaneously, sodium citrate, as a water softener, is in powder form, facilitating thorough mixing with EDTA and laying the foundation for subsequent water hardness reduction.

[0037] Subsequently, 99% sodium hydroxide was slowly added to the mixture while maintaining a constant stirring speed, and stirred for 10 minutes until completely dissolved. During this process, the addition of sodium hydroxide not only adjusted the pH of the system but also created a uniform distribution through intermolecular forces with other components. This uniform distribution ensured the overall stability of the detergent's performance and provided the necessary alkaline environment for subsequent removal of grease stains.

[0038] Next, 40% sodium polyacrylate was added to the system in small, multiple additions, stirring for 3 minutes after each addition to ensure complete dispersion. The addition of sodium polyacrylate aims to utilize its excellent dispersing properties, prevent particle aggregation, and improve detergent stability. In this stage, fatty alcohol polyoxyethylene ether (AEO-3) was slowly added to the system while the stirring speed was increased to medium and continued for 15 minutes to ensure thorough mixing of the surfactant with other components and the formation of a homogeneous liquid phase. The introduction of fatty alcohol polyoxyethylene ether (AEO-3) significantly reduced the surface tension of the liquid, allowing the detergent to quickly penetrate stains on the surface of tableware, achieving highly efficient stain removal combined with mechanical rinsing.

[0039] Subsequently, ethanol and triethanolamine were pre-mixed at a mass ratio of 3:2 to form a solvent mixture. This solvent mixture was slowly added to the above system while maintaining medium-speed stirring for 10 minutes until the system was completely transparent and showed no obvious layering. The addition of ethanol not only adjusted the viscosity of the system but also promoted the uniform mixing of the components, while triethanolamine further fine-tuned the pH value of the system, keeping it within a suitable range. The final detergent was transparent or translucent, and the components formed a homogeneous and stable system through intermolecular forces.

[0040] Furthermore, sodium citrate reacts with calcium and magnesium ions in hard water to form soluble salts, further reducing water hardness and scale formation. Sodium polyacrylate, through its dispersing properties, prevents particle aggregation, ensuring the detergent maintains uniform and stable performance throughout the washing process. Sodium hydroxide and triethanolamine work together to adjust the pH of the system, keeping it within a suitable range, thereby enhancing the removal of grease stains. Ethanol, as a solvent, not only promotes uniform mixing between the components but also improves the detergent's fluidity, making it easier to disperse in the dishwasher.

[0041] In practical applications, this detergent is suitable for various types of dishwashers, including household countertop dishwashers, built-in dishwashers, and large commercial dishwashers. It typically uses high-temperature, high-pressure water in combination with the detergent to rinse the dishes. For washing needs under different water quality conditions, this detergent demonstrates excellent descaling effect and stability. Especially under hard water conditions, the synergistic effect of its chelating agents and softeners significantly reduces the rate of scale formation, thereby extending the dishwasher's lifespan and reducing maintenance costs.

[0042] To meet consumers' personalized needs, appropriate amounts of colorants or fragrances can be added to detergents. For example, adding blue or green colorants can make the detergent transparent or semi-transparent, thereby enhancing the product's appearance and appeal. Meanwhile, adding lemon or mint fragrances can improve the detergent's scent, making it more in line with consumer preferences.

[0043] During the production process, a dispersion method is used to uniformly distribute the active ingredient onto a non-fibrous carrier layer. Specifically, the formulation containing the active ingredient is transferred to the non-fibrous carrier layer through a distribution plate of a coating device, ensuring that the active ingredient forms a uniform dispersion layer on the carrier layer. Subsequently, a non-fibrous carrier layer impermeable to the active ingredient is applied over the dispersion layer, thereby completely encapsulating the active ingredient within the composite laminate tablet. During the coating process, the coating speed and temperature must be strictly controlled to ensure the uniform distribution of the active ingredient and the stability of the system.

[0044] During the cutting and stamping process, the composite laminate is cut into single-dose detergents, with each detergent weighing approximately 20 grams to meet the needs of a single wash.

[0045] The detergent provided by this invention exhibits excellent descaling effect and stability. Its phosphate-free design meets environmental protection requirements, and through optimized formulation and preparation processes, it effectively solves the problems of alkaline scale and limescale residue present in existing technologies. In practical applications, this detergent can adapt to washing needs under different water quality conditions and significantly improves the cleaning efficiency and lifespan of dishwashers.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A descaling dishwasher detergent, characterized in that, It contains the following components: disodium ethylenediaminetetraacetate as a chelating agent, with a content of 1%; 99% sodium hydroxide as an alkalinity regulator, with a content of 3%; sodium citrate as a softener, with a content of 15%; 40% sodium polyacrylate as a dispersant, with a content of 2%; fatty alcohol polyoxyethylene ether AEO-3 as a surfactant, with a content of 10%; ethanol as a solvent, with a content of 3%; and triethanolamine as a pH regulator, with a content of 2%. All components are non-fibrous structures and form a homogeneous and stable system through intermolecular forces.

2. The detergent according to claim 1, characterized in that, The detergent is transparent or semi-transparent.

3. The detergent according to claim 1, characterized in that, It also contains colorants or fragrances to improve its appearance or smell.

4. The detergent according to claim 1, characterized in that, The surfactant is selected from fatty alcohol polyoxyethylene ether AEO-3 or sodium lauryl sulfate.

5. The detergent according to claim 1, characterized in that, The carrier layer is composed of a material selected from the group consisting of polyethylene terephthalate, plasticized vinyl acetate-vinyl chloride copolymer, nylon, ethylene-vinyl acetate copolymer, plasticized polyvinyl chloride, polyurethane, polyvinylidene chloride, polypropylene, polyethylene, or polyamide.

6. A method for preparing the detergent according to any one of claims 1 to 5, characterized in that, Includes the following steps: S001: A carrier layer that is impermeable to active substances is combined with a non-fibrous dispersion layer; S002: A separately prepared, free-flowing formulation containing active substances is coated onto a dispersion layer by a dispersion method. S003: In a further step, a non-fibrous carrier layer impermeable to the active substance is coated onto a dispersion layer containing the active substance.

7. The method according to claim 6, characterized in that, The dispersion method transfers a formulation containing active substances onto a non-fibrous carrier layer via a distribution plate of a coating device. The viscosity of the formulation containing active substances ranges from 10 to 100 dPa·s. Before or after coating the formulation containing active substances, the detergent can be dispensed in single doses by cutting or punching from the composite laminate that has already been formed.

8. The method according to claim 6, characterized in that, The active substance is selected from the group consisting of sodium percarbonate, sodium perborate, sodium hypochlorite, citric acid, lactic acid, malic acid, tartaric acid, sodium gluconate, sodium silicate, sodium carbonate, potassium carbonate, sodium sulfate, and potassium sulfate.

9. The method according to claim 6, characterized in that, The dispersion method is carried out at room temperature, and the viscosity of the mixture is controlled by adjusting the ratio of active substance to dispersant. The dispersion medium contains a chelating agent based on disodium ethylenediaminetetraacetate and sodium citrate, and a dispersant based on sodium polyacrylate and fatty alcohol polyoxyethylene ether AEO-3.

10. The method according to claim 6, characterized in that, The active substance is liquid or solid at room temperature, and its viscosity is adjusted by adding solvent to achieve uniform dispersion.