Solid detergent, washing block and preparation method and application thereof

Abstract

The invention provides a solid detergent, a washing block and a preparation method and application thereof. The solid detergent comprises a component A and a component B, wherein the mass ratio of the component A to the component B is (0.2-5): 1; the component A comprises a surfactant A and an effervescing agent A; the mass percentage X of the surfactant A in the component A is 0-6 wt% but not 0 wt%; the component B comprises a surfactant B and an effervescing agent B; the mass percentage Y of the surfactant B in the component B is at least 3wt%; wherein the content of Y-X is at least 3wt%; the sum of the mass of the surfactant A and the surfactant B accounts for 4.5 wt% or above of the mass of the solid detergent. A washing block formed by the solid detergent has high hardness, is not easy to break in the transportation process, is short in disintegration time, and can effectively remove various stains.

Description

Technical Field

[0001] This invention relates to a solid detergent, a detergent block, its preparation method, and its application. Background Technology

[0002] The laundry cleaning market is rapidly developing across various product forms, with traditional products such as laundry detergent, laundry powder, and soap dominating the market. Meanwhile, laundry pods, as single-use products, are increasingly popular due to their convenience and strong cleaning power. Among these products, soap has relatively weak stain removal capabilities, while laundry powder dissolves slowly and has poor solubility, especially during low-temperature washing. While liquid products like laundry detergent and laundry pods are convenient to use, many ingredients in their formulas, such as peroxides, are unstable in water and easily become inactive and oxidize during storage, potentially decomposing other ingredients. Furthermore, liquid products have a high water content, requiring significant energy consumption during transportation and necessitating insulation in low-temperature environments, resulting in high production and transportation costs and a high carbon footprint.

[0003] Single-use effervescent laundry detergent products can contain higher and more diverse active ingredients and are convenient to use. They are produced by mixing and pressing at room temperature, a simple process. The product contains almost no water, maximizing energy savings, packaging material costs, and transportation costs, and has recently gained increasing attention. Effervescent laundry tablets refer to a type of product containing effervescent disintegrants, typically containing small-molecule acids and carbonates / bicarbonates. During washing, the acidic substances react with the carbonates / bicarbonates, releasing gas and rapidly disintegrating the detergent tablet, accelerating the product's dissolution rate. Laundry tablets are a solid dosage form, usually made by mixing powdered or granular substances evenly and then pressing them under pressure to create a specific weight and shape of detergent, which can be spherical, square, or various irregular shapes.

[0004] CN108018142A discloses an effervescent laundry detergent sheet, comprising a surfactant, a detergent builder, and a solubilizer. The detergent builder is composed of organic acid, sodium carboxymethyl starch, and light silica powder; the solubilizer is composed of sodium bicarbonate, polyethylene glycol, potassium silicate, and salt. The ratio of the surfactant, detergent builder, and solubilizer is 10-60:20-50:20-50. CN105238604A discloses a highly stable effervescent laundry detergent sheet, comprising 5-10 parts of nonionic surfactant, 15-25 parts of anionic surfactant, 25-35 parts of detergent builder, 5-20 parts of sodium chloride, 1-5 parts of binder, 25-35 parts of effervescent agent, 1.5-5 parts of coating agent, 0.1-0.5 parts of tetrasodium ethylenediaminetetraacetate, and 1-3 parts of lubricant. After the product is molded and compressed, the coating agent is dissolved in anhydrous alcohol or acetone, and a coating is sprayed on to improve the product's moisture resistance and absorbency.

[0005] Both of the above methods involve uniformly mixing surfactants and other solid raw materials before tableting. Commonly used detergent surfactants, such as sodium dodecylbenzene sulfonate, result in poor product flowability after mixing, easily causing them to stick to the mold during tableting and reducing production efficiency. If a secondary coating process is applied to the laundry sheets, it requires the use of volatile organic solvents, leading to waste and environmental pollution. Importantly, the tableting process typically requires high pressure to ensure the tablets are firm and do not easily break or shed powder. Tablets produced under high pressure conditions are difficult to disintegrate quickly during use, resulting in a longer dissolution and release time for the active ingredients, thus affecting washing efficiency and cleaning power.

[0006] CN1284125 describes a compact yet rapidly disintegrating multiphase compressed laundry product, comprising surfactants and builders. The absolute content (percentage concentration of surfactant in each phase) of the individual surfactants in the detergent tablets varies by no more than 3%. This invention attempts to resolve the contradiction between disintegration and compact compression by ensuring a relatively uniform surfactant content across all phases. However, with the surfactants evenly distributed across the phases, due to their properties, they are highly compressed during extrusion. Surfactants are highly hydrophilic materials; upon contact with water after compaction, a hydration layer forms on the particle surface, similar to a 'fish-eye' phenomenon. This hydration layer prevents water from rapidly penetrating the interior, hindering and slowing the disintegration rate of the laundry tablet. Although this patent demonstrates an extremely short disintegration time, this is partly due to the tablet's low hardness, and partly because the disintegration test was likely conducted in easily disintegrating hot water with a large amount of water added. The applicant in patent CN1216976C tested the disintegration time at 30°C, adding 40g of laundry tablets to 600mL of water. Furthermore, the tablet hardness is only around 50N, making it impossible to guarantee integrity during transportation.

[0007] CN1935971A discloses a component that causes a detergent tablet to rapidly disintegrate upon contact with water. This component includes an acid source and an alkali source, respectively encapsulated by other highly soluble and highly wettable surfactants or respectively adhered to other particles. The detergent tablet body or capsule wall comprises 30-90% particles, with the remainder being 10-70% powder. The effervescent component in the disintegrant is entirely distributed within the particles or adhered to the outside of the particles. Forming such a structure requires high-temperature spraying, a complex process requiring sophisticated production equipment.

[0008] Patrizio Ricci et al., in EP1327676, described a multiphase detergent briquette product in which a first phase of a specific shape and specification contains a mold, and a second phase contains a binder that effectively adheres to the first phase, with a weight ratio of at least 6:1 between the first and second phases. Patrizio Ricci et al., in USP6551982, further described another method for pressing multiphase detergent briquettes. By controlling the pressure of the first phase to be higher and the pressure of the second phase to be lower, and by including a binder in the second phase, the briquette product can be effectively dissolved, rapidly releasing the active ingredients.

[0009] Laundry detergents typically require the addition of surfactants to remove stains. However, the addition of surfactants can create high viscosity, and crucially, during product disintegration, they can form a hydration layer that prevents further water penetration. While not strictly explained by this hydration phenomenon, high surfactant content significantly slows down and hinders the dissolution and release of active ingredients in compressed products.

[0010] Although both EP1327676 and USP6551982 mention surfactants and their potential application in laundry products, neither actually addresses the proportion of surfactants or how to control their distribution to address the viscosity issues of the different phases during the pressing process and their impact on the final product's disintegration and release rate. This inherent drawback of adding surfactants to laundry products remains to be addressed. Summary of the Invention

[0011] In view of the above-mentioned deficiencies of the prior art, the present invention provides a solid detergent, a detergent block, a method for preparing the same, and its application. The detergent block of the present invention balances the hardness and disintegration rate of the detergent block, is not easily broken during transportation, and can effectively remove various stains when applied in a washing machine.

[0012] The present invention solves the above-mentioned technical problems through the following technical solutions.

[0013] One aspect of the present invention provides a solid detergent, characterized in that it comprises component A and component B, wherein the mass ratio of component A to component B is (0.2-5):1;

[0014] Component A includes surfactant A and effervescent agent A; based on a total mass of 100 wt% of component A, the mass percentage X of surfactant A in component A is 0-6 wt%, but not 0 wt%.

[0015] Component B includes surfactant B and effervescent agent B; based on a total mass of 100 wt% of component B, the surfactant B accounts for at least 3 wt% of the mass percentage Y of component B.

[0016] Wherein, X and Y satisfy the following condition: YX is at least 3wt%;

[0017] Based on a total mass of 100 wt% for the solid detergent, the sum of the masses of surfactant A and surfactant B accounts for more than 4.5 wt% of the total mass of the solid detergent.

[0018] This invention unexpectedly discovered that by adjusting the mass ratio between two or more phases and the proportion of surfactants in each phase, without controlling the pressure of different phases, it is possible to effectively achieve good product compactness while selectively and rapidly releasing a certain phase, thereby promoting the dissolution and breakdown of the overall product. This not only simplifies the processing technology but, more importantly, ensures the rapid disintegration of high-activity-content briquettes and the rapid release of active ingredients, thus guaranteeing improved washing efficiency and effectiveness. In this invention, the surfactants are unevenly and asymmetrically distributed, with one phase having a lower surfactant content. By controlling and optimizing the overall surfactant content and the ratio between the two phases, one phase rapidly disintegrates and breaks down, making the overall solid detergent thinner and lighter. The other phase has an increased contact area with water, allowing water to penetrate and dissolve more effectively. This phenomenon becomes more pronounced under mechanical stirring conditions, such as machine washing. The relatively slower-releasing phase becomes thinner and easier to pulverize, thus facilitating the release of active ingredients.

[0019] In a preferred embodiment of the present invention, the mass ratio of component A to component B is (0.3-4):1, for example 1:3, 2:3, 1:1, 2:1, 3:1 or 4:1.

[0020] In a preferred embodiment of the present invention, X is 0-5 wt% but not 0 wt%, more preferably 3-5 wt%, for example 3.4 wt%, 3.5 wt%, 3.8 wt%, 4 wt%, 4.2 wt%, 4.25 wt%, 4.45 wt%, or 4.5 wt%.

[0021] In a preferred embodiment of the present invention, the Y is 4 wt% or more, more preferably 7-15 wt%, for example 7.5 wt%, 7.9 wt%, 8 wt%, 8.5 wt%, 8.875 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, or 14.8 wt%.

[0022] In a preferred embodiment of the present invention, X and Y satisfy: YX = 3.5-12wt%, for example 3.7wt%, 4.1wt%, 5.1wt%, 5.5wt%, 6.6wt%, 7wt%, 8wt%, 8.2wt%, 9wt%, 10.35wt%, or 11wt%.

[0023] In a preferred embodiment of the present invention, based on a total mass of 100 wt% of the solid detergent, the sum of the masses of surfactant A and surfactant B accounts for 5-13 wt% of the mass of the solid detergent, for example, 5.1 wt%, 5.3 wt%, 5.5 wt%, 5.60 wt%, 5.85 wt%, 6 wt%, 7 wt%, 8 wt%, 8.72 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 12.21 wt%, or 12.4 wt%.

[0024] In specific embodiments of the present invention, the types of surfactant A and / or surfactant B can be conventional in the art, typically including one or more of anionic surfactants, cationic surfactants and nonionic surfactants, preferably anionic surfactants.

[0025] The anionic surfactant preferably comprises one or more of sulfates, sulfonates, and fatty acid salts, such as one or more of alkyl sulfates, alkylbenzene sulfonates, and alkyl fatty acid salts. The alkyl group typically has 8-22 carbon atoms, such as 12, 14, 16, or 18. The salt can be a sodium salt and / or a potassium salt. The fatty acid salt surfactant is commonly referred to as soap powder, including but not limited to one or a mixture of two or more of lauryl soap powder, palm kernel oil-based soap powder, palm oil-based soap powder, coconut oil-based soap powder, and tallow-based soap powder. In specific embodiments of the present invention, lauryl soap powder and palm-based soap powder are used, also referred to as sodium lauryl fatty acid and sodium palm-based fatty acid.

[0026] The nonionic surfactant may be alkoxylated, including but not limited to lauryl alcohol polyoxyethylene ether. Those skilled in the art will know that the lauryl alcohol polyoxyethylene ether is typically a liquid. To prepare the solid detergent, solid particulate surfactants are usually selected as raw materials, such as powdered particles and / or flake particles. Therefore, the content of the liquid component in the composition needs to be controlled. Based on 100 wt% of component A or component B, the content of lauryl alcohol polyoxyethylene ether is generally below 4 wt%.

[0027] In a specific embodiment of the present invention, the surfactant A includes one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium lauryl hydroxyethyl sulfonate, sodium cocoyl hydroxyethyl sulfonate, sodium lauryl fatty acid, sodium cocoyl fatty acid, sodium palm kernel oil fatty acid, sodium palm-based fatty acid, sodium tallow-based fatty acid, and lauryl alcohol polyoxyethylene ether AEO9.

[0028] In a specific embodiment of the present invention, the surfactant B includes one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium lauryl hydroxyethyl sulfonate, sodium cocoyl hydroxyethyl sulfonate, sodium lauryl fatty acid, sodium cocoyl fatty acid, sodium palm kernel oil, sodium palmitate, and sodium tallow.

[0029] In this invention, the selection of effervescent agent A and / or effervescent agent B can be conventional in the art, generally referring to an effervescent system that generates gas, typically releasing the gas upon contact with water. The effervescent system usually contains at least two components that react together to generate gas. Given that many systems, such as those releasing nitrogen, oxygen, hydrogen, or preferably carbon dioxide, can be used for this purpose, the effervescent system used in the solid detergent according to the invention is preferably selected according to economic and ecological criteria. It is preferably composed of alkali metal carbonates and / or bicarbonates and an acidifying agent suitable for releasing carbon dioxide from an aqueous solution of the alkali metal salt.

[0030] The alkali metal carbonates and / or bicarbonates include one or more of sodium carbonate, sodium bicarbonate, potassium carbonate, and potassium bicarbonate.

[0031] The acidifying agent includes boric acid and alkali metal hydrogen sulfates, alkali metal dihydrogen phosphates, and other inorganic salts, preferably organic acidifying agents. The organic acidifying agent has a carbon chain number of C2 to C20, specifically, one or more of citric acid, tartaric acid, succinic acid, malonic acid, glutaric acid, adipic acid, maleic acid, fumaric acid, oxalic acid, and polyacrylic acid. The acidifying agent may also be an organic sulfonic acid, such as aminosulfonic acid.

[0032] In this invention, based on a total mass of 100 wt% of component A, the effervescent agent A accounts for a mass percentage of 40-85 wt% of component A, for example, 46.1 wt%, 50 wt%, 56 wt%, 60 wt%, 68.1 wt%, 70 wt%, 70.5 wt%, 70.7 wt%, 80 wt%, 81.6 wt%, or 83.8 wt%.

[0033] In this invention, based on a total mass of 100 wt% of component B, the effervescent agent B accounts for a mass percentage of 30-85 wt% of component B, for example, 34 wt%, 40 wt%, 46.1 wt%, 50 wt%, 56 wt%, 60 wt%, 65 wt%, 68.1 wt%, 70 wt%, 70.5 wt%, 70.7 wt%, 75 wt%, 80 wt%, 81.6 wt%, or 83.8 wt%.

[0034] In this invention, based on a total solid detergent mass of 100 wt%, the total mass percentage of effervescent agent A and effervescent agent B is preferably 50-85 wt%, specifically, for example, 51 wt%, 51.05 wt%, 55 wt%, 60 wt%, 64.07 wt%, 65 wt%, 65.68 wt%, 70 wt%, 73.28 wt%, 75 wt%, 75.94 wt%, 80 wt%, or 80.53 wt%.

[0035] In a specific embodiment of the present invention, component A further contains bleaching agent A; component B further contains bleaching agent B. To ensure better cleaning performance when component A dissolves first, the mass percentage of bleaching agent A in component A is greater than or equal to the mass percentage of bleaching agent B in component B, and the difference between the two values ​​can be 1-25 wt%, for example 2 wt%, 3 wt%, 5 wt%, 7 wt%, 9 wt%, 10 wt%, 20 wt%, or 21 wt%.

[0036] In this invention, based on a total mass of 100 wt% of component A, the mass percentage of bleaching agent A in component A can be conventional in the art, preferably 3-30 wt%, for example 5 wt%, 6 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%, or 27 wt%.

[0037] In this invention, based on a total mass of 100 wt% of component B, the mass percentage of bleaching agent B in component B is conventional in the art, preferably 2-10 wt%, for example 3 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, or 9 wt%.

[0038] In this invention, based on 100% of the total mass of the solid detergent, the total mass of bleach A and bleach B can be, in the art, preferably 3-20 wt%, for example 4 wt%, 4.2 wt%, 5 wt%, 5.25 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13.2 wt%, 14 wt%, 15 wt%, 16 wt%, or 16.5 wt%.

[0039] In this invention, the types of bleaching agent A and / or bleaching agent B can be conventional in the art and need not be particularly limited, including but not limited to one or more of sodium percarbonate, sodium perborate and superphosphate.

[0040] In this invention, component A may further include detergent auxiliaries A and / or component B may further include detergent auxiliaries B. The term detergent auxiliaries refers to auxiliary materials, other than surfactants, effervescent agents, and bleach, added as needed depending on the specific circumstances, including, optionally, one or more of the following: bleach activators, chelating agents, fillers, fragrances, and proteases. In one specific embodiment, detergent auxiliaries A include fillers, bleach activators, and fragrances. In one specific embodiment, detergent auxiliaries B include fillers, proteases, chelating agents, bleach activators, and fragrances.

[0041] The content of the detergent additive A can be added according to actual needs. Based on the total mass of component A being 100 wt%, the total content of detergent additive A can be less than 50 wt%, less than 40 wt%, less than 30 wt%, less than 20 wt%, or less than 10 wt%, for example, 6.2 wt%, 9.7 wt%, 12.4 wt%, 12.9 wt%, 13.5 wt%, or 22.9 wt%.

[0042] Wherein, based on a total mass of component B of 100 wt%, the total content of detergent auxiliaries B is greater than the total content of detergent auxiliaries A in component A. Wherein, based on a total mass of component B of 100 wt%, the total content of detergent auxiliaries B may be less than 50 wt%, less than 40 wt%, less than 30 wt%, less than 20 wt%, or less than 15 wt%, for example, 9.5 wt%, 13.3 wt%, 28 wt%, or 29.5 wt%.

[0043] The bleaching activator generally refers to a compound that improves the bleaching effect of the bleaching agent. The bleaching activator can be a compound that generates an aliphatic percarboxylic acid and / or a substituted perbenzoic acid under hydrolytic conditions. Preferred is a polyacylated alkyl diamine, such as tetraacetylethylenediamine. The content of the bleaching activator is conventional in the art; based on 100 wt% of the total mass of component A or component B, the content of the bleaching activator is preferably 0-3 wt%, for example, 0.5 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, 2 wt%, or 2.5 wt%.

[0044] The chelating agent is conventional in the art, and its main function is to chelate trace metal ions, such as iron and copper, in water. These metal elements can cause stains; when the solid detergent contains a chelating agent, the non-ferrous metals are removed, thus achieving the effect of stain removal. The chelating agent can be added to the solid detergent as needed, without special limitation. The type of chelating agent can be conventional in the art, including but not limited to disodium ethylenediaminetetraacetate. The content of the chelating agent can be conventional in the art, based on 100 wt% of the total mass of component A or component B, and preferably is less than 0.5 wt%, for example, 0.1 wt%.

[0045] The filler can be conventional in the art, including but not limited to one or more of anhydrous sodium sulfate, sodium metasilicate, and starch. The anhydrous sodium sulfate can absorb water, preventing the effervescent agent from reacting under hygroscopic conditions, thus providing a certain protective effect. In a specific embodiment of the invention, based on 100 wt% of the total mass of component A or component B, the content of anhydrous sodium sulfate can be 5-20 wt%, for example, 8 wt%, 10 wt%, 10.5 wt%, 11.1 wt%, or 12 wt%. The sodium metasilicate can increase the alkalinity of the solid detergent, thereby enhancing the washing effect. In a specific embodiment of the invention, based on 100 wt% of the total mass of component A or component B, the content of sodium metasilicate can be 5-30 wt%, for example, 8 wt%, 10 wt%, 15 wt%, 20 wt%, 24.6 wt%, or 25 wt%. The starch in the pressed washing block increases the volume, reduces the block density, and enhances the consumer's sensory experience. In a specific embodiment of the present invention, based on 100wt% of the total mass of component A or component B, the starch content can be less than 5wt%, for example, 1wt%, 1.5wt%, 2wt%, or 3wt%.

[0046] In order to enhance the fragrance of the solid detergent, a fragrance is usually added. The fragrance content is generally less than 1 wt%, for example less than 0.5 wt%, based on 100 wt% of the total mass of component A or component B.

[0047] The protease may be conventional in the art. Based on a total mass of 100 wt% of component A or component B, the content of the protease may be less than 1 wt%, for example, 0.5 wt%.

[0048] In this invention, the terms A and B in surfactant A and surfactant B, effervescent agent A and effervescent agent B, bleach A and bleach B, and detergent additive A and detergent additive B have no special meaning; they are merely used to distinguish between components A and components B, respectively. The components represented by A and B may be the same or different.

[0049] Another aspect of the present invention provides a method for preparing a washing block, wherein at least one or two of the components A and / or the components B are independently pre-pressed and then pressed together to form a block, and the resulting block is the washing block.

[0050] In this invention, components A and B are pre-pressed separately and then pressed together, or one component is pre-pressed first and then pressed together with the other component, forming an interconnected yet independent two-phase structure. This achieves uneven distribution of surfactants, which, combined with the formulation of this invention, results in one phase rapidly disintegrating and thinning, while the other phase has increased contact area with water, thus accelerating disintegration. In a preferred embodiment, component A is pre-pressed before component B is added and pressed. Component B can be in dispersed powder form and then pressed with the pre-pressed component A in a second pressing process. Alternatively, component B can be pre-pressed and then mixed with the pre-pressed component A in a second pressing process. In this preferred embodiment, component A contains a smaller absolute value of surfactant and a larger amount of effervescent agent than component B. Therefore, under the pressure of the second pressing, component A has a smaller impact on the dissolution rate of the effervescent agent. Conversely, if component B is pre-pressed before being pressed with component A a second time, component B contains more surfactant and less effervescent agent. The density of component B after two pressings will increase compared to component A after only one pressing, which will reduce the release rate of surfactant and ultimately lead to a decrease in washing efficiency.

[0051] In a specific embodiment of the present invention, the total pressure applied to component A during molding is greater than the total pressure applied to component B during molding. This total pressure refers to the sum of pressure applied during one or more molding processes.

[0052] In a specific embodiment of the present invention, the pressing pressure is at least twice, for example, three times, four times or five times, the pre-pressing pressure.

[0053] In a specific embodiment of the present invention, the pre-pressing pressure is 5 kN / cm² or higher, for example, 8 kN / cm² or 10 kN / cm².

[0054] In a specific embodiment of the present invention, the pressing pressure is 10 kN / cm² or higher, for example, 20 kN / cm², 30 kN / cm², 40 kN / cm² or 50 kN / cm².

[0055] In this invention, the shape of the washing block can be produced according to actual needs regarding shape and weight. The required 3D form refers to any usable shape, including regular and irregular shapes. Regular shapes include, for example, rods, cuboids, cubes, cylinders, ellipses, triangles, or other polygonal shapes. Irregular shapes include, for example, cartoon shapes, leaves, petals, and other irregular shapes.

[0056] Another aspect of the present invention provides a washing block, which is prepared by the above-described preparation method.

[0057] Another aspect of the present invention provides a washing block comprising an A phase and a B phase, wherein the mass ratio of the A phase to the B phase is (0.2-5):1; one side of the A phase is bonded to one side of the B phase.

[0058] Phase A includes surfactant A and effervescent agent A; based on a total mass of 100 wt% of phase A, the mass percentage of surfactant A in phase A is 0-6 wt%, but not 0 wt%.

[0059] Phase B includes surfactant B and effervescent agent B; based on a total mass of 100 wt% of phase B, the surfactant B accounts for at least 3 wt% of phase B by mass Y.

[0060] Wherein, X and Y satisfy the following condition: YX is at least 3wt%;

[0061] Based on a total mass of 100 wt% for the washing block, the mass of surfactant A and surfactant B together constitute more than 4.5 wt% of the mass of the washing block.

[0062] In this invention, the washing block can also form a three-phase or more-phase structure, which can be achieved by repeating the first phase and the second phase in sequence, or by adding phase components of conventional detergents.

[0063] As those skilled in the art will know, the adhesive connection in this invention is achieved through pressure compression.

[0064] In a preferred embodiment of the present invention, the hardness of phase A in the washing block is greater than the hardness of phase B.

[0065] In a specific embodiment of the present invention, the hardness of the washing block is 80-200KN, for example 100N, 105N, 110N, 120KN, 130N or 150KN.

[0066] In a preferred embodiment of the present invention, the mass ratio of phase A to phase B is (0.3-4):1, for example 1:3, 2:3, 1:1, 2:1, 3:1 or 4:1.

[0067] In a preferred embodiment of the present invention, X is 0-5 wt% but not 0 wt%, more preferably 3-5 wt%, for example 3.4 wt%, 3.5 wt%, 3.8 wt%, 4 wt%, 4.2 wt%, 4.25 wt%, 4.45 wt%, or 4.5 wt%.

[0068] In a preferred embodiment of the present invention, the Y is 4 wt% or more, more preferably 7-15 wt%, for example 7.5 wt%, 7.9 wt%, 8 wt%, 8.5 wt%, 8.875 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, or 14.8 wt%.

[0069] In a preferred embodiment of the present invention, X and Y satisfy: YX = 3.5-12wt%, for example 3.7wt%, 4.1wt%, 5.1wt%, 5.5wt%, 6.6wt%, 7wt%, 8wt%, 8.2wt%, 9wt%, 10.35wt%, or 11wt%.

[0070] In a preferred embodiment of the present invention, based on a total solid detergent mass of 100 wt%, the mass and percentage of surfactant A and surfactant B in the solid detergent mass are between 5-13 wt%, for example 5.1 wt%, 5.3 wt%, 5.5 wt%, 5.60 wt%, 5.85 wt%, 6 wt%, 7 wt%, 8 wt%, 8.72 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 12.21 wt%, or 12.4 wt%.

[0071] In specific embodiments of the present invention, the types of surfactant A and / or surfactant B can be conventional in the art, typically including one or more of anionic surfactants, cationic surfactants and nonionic surfactants, preferably anionic surfactants.

[0072] The anionic surfactant preferably comprises one or more of sulfates, sulfonates, and fatty acid salts, such as one or more of alkyl sulfates, alkylbenzene sulfonates, and alkyl fatty acid salts. The alkyl group typically has 8-22 carbon atoms, such as 12, 14, 16, or 18. The salt can be a sodium salt and / or a potassium salt. The fatty acid salt surfactant is commonly referred to as soap powder, including but not limited to one or a mixture of two or more of lauryl soap powder, palm kernel oil-based soap powder, palm oil-based soap powder, coconut oil-based soap powder, and tallow-based soap powder. In specific embodiments of the present invention, lauryl soap powder and palm-based soap powder are used, also referred to as sodium lauryl fatty acid and sodium palm-based fatty acid.

[0073] The nonionic surfactant may be alkoxylated, including but not limited to lauryl alcohol polyoxyethylene ether. Those skilled in the art will know that the lauryl alcohol polyoxyethylene ether is typically a liquid. To prepare the solid detergent, solid particulate surfactants are usually selected as raw materials, such as powdered particles and / or flake particles. Therefore, the content of the liquid component in the composition needs to be controlled. Based on 100 wt% of phase A or phase B, the content of lauryl alcohol polyoxyethylene ether is generally below 4 wt%.

[0074] In a specific embodiment of the present invention, the surfactant A includes one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium lauryl hydroxyethyl sulfonate, sodium cocoyl hydroxyethyl sulfonate, sodium lauryl fatty acid, sodium cocoyl fatty acid, sodium palm kernel oil fatty acid, sodium palm-based fatty acid, sodium tallow-based fatty acid, and lauryl alcohol polyoxyethylene ether AEO9.

[0075] In a specific embodiment of the present invention, the surfactant B includes one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium lauryl hydroxyethyl sulfonate, sodium cocoyl hydroxyethyl sulfonate, sodium lauryl fatty acid, sodium cocoyl fatty acid, sodium palm kernel oil, sodium palmitate, and sodium tallow.

[0076] In this invention, the selection of effervescent agent A and / or effervescent agent B can be conventional in the art, generally referring to an effervescent system that generates gas, typically releasing the gas upon contact with water. The effervescent system usually contains at least two components that react together to generate gas. Given that many systems, such as those releasing nitrogen, oxygen, hydrogen, or preferably carbon dioxide, can be used for this purpose, the effervescent system used in the solid detergent according to the invention is preferably selected according to economic and ecological criteria. It is preferably composed of alkali metal carbonates and / or bicarbonates and an acidifying agent suitable for releasing carbon dioxide from an aqueous solution of the alkali metal salt.

[0077] The alkali metal carbonates and / or bicarbonates include one or more of sodium carbonate, sodium bicarbonate, potassium carbonate, and potassium bicarbonate.

[0078] The acidifying agent includes boric acid and alkali metal hydrogen sulfates, alkali metal dihydrogen phosphates, and other inorganic salts, preferably organic acidifying agents. The organic acidifying agent has a carbon chain number of C2 to C20, specifically, one or more of citric acid, tartaric acid, succinic acid, malonic acid, glutaric acid, adipic acid, maleic acid, fumaric acid, oxalic acid, and polyacrylic acid. The acidifying agent may also be an organic sulfonic acid, such as aminosulfonic acid.

[0079] In this invention, based on the total mass of phase A of 100 wt%, the effervescent agent A accounts for 40-85 wt% of the mass of phase A, for example, 46.1 wt%, 50 wt%, 56 wt%, 60 wt%, 68.1 wt%, 70 wt%, 70.5 wt%, 70.7 wt%, 80 wt%, 81.6 wt%, or 83.8 wt%.

[0080] In this invention, based on the total mass of phase B of 100 wt%, the effervescent agent B accounts for 30-85 wt% of the mass of phase B, for example, 34 wt%, 40 wt%, 46.1 wt%, 50 wt%, 56 wt%, 60 wt%, 65 wt%, 68.1 wt%, 70 wt%, 70.5 wt%, 70.7 wt%, 75 wt%, 80 wt%, 81.6 wt%, or 83.8 wt%.

[0081] In this invention, based on the total mass of the washing block being 100 wt%, the total mass percentage of the effervescent agent A and the effervescent agent B is preferably 50-85 wt%, specifically, for example, 51 wt%, 51.05 wt%, 55 wt%, 60 wt%, 64.07 wt%, 65 wt%, 65.68 wt%, 70 wt%, 73.28 wt%, 75 wt%, 75.94 wt%, 80 wt%, or 80.53 wt%.

[0082] In a specific embodiment of the present invention, phase A further contains bleaching agent A; phase B further contains bleaching agent B. To ensure better cleaning performance of phase A upon initial dissolution, the mass percentage of bleaching agent A in phase A is greater than or equal to the mass percentage of bleaching agent B in phase B, with the difference between the two values ​​ranging from 1 to 25 wt%, for example, 2 wt%, 3 wt%, 5 wt%, 7 wt%, 9 wt%, 10 wt%, 20 wt%, or 21 wt%.

[0083] In this invention, based on the total mass of phase A of 100 wt%, the mass percentage of bleaching agent A in phase A can be conventional in the art, preferably 3-30 wt%, for example 5 wt%, 6 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%, or 27 wt%.

[0084] In this invention, based on the total mass of phase B of 100 wt%, the mass percentage of bleaching agent B in phase B is conventional in the art, preferably 2-10 wt%, for example 3 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, or 9 wt%.

[0085] In this invention, based on 100% of the total mass of the washing block, the total mass of bleach A and bleach B can be, in the art, preferably 3-20 wt%, for example 4 wt%, 4.2 wt%, 5 wt%, 5.25 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13.2 wt%, 14 wt%, 15 wt%, 16 wt%, or 16.5 wt%.

[0086] In this invention, the types of bleaching agent A and / or bleaching agent B can be conventional in the art and need not be particularly limited, including but not limited to one or more of sodium percarbonate, sodium perborate and superphosphate.

[0087] In this invention, phase A may further include detergent auxiliaries A and / or phase B may further include detergent auxiliaries B. The term detergent auxiliaries refers to auxiliary materials, other than surfactants, effervescent agents, and bleach, added as needed depending on the specific circumstances, including, optionally, one or more of the following: bleach activators, chelating agents, fillers, fragrances, and proteases. In one specific embodiment, detergent auxiliaries A include fillers, bleach activators, and fragrances. In one specific embodiment, detergent auxiliaries B include fillers, proteases, chelating agents, bleach activators, and fragrances.

[0088] The content of the detergent additive A can be added according to actual needs. Based on the total mass of phase A being 100 wt%, the total content of detergent additive A can be less than 50 wt%, less than 40 wt%, less than 30 wt%, less than 20 wt%, or less than 10 wt%, for example, 6.2 wt%, 9.7 wt%, 12.4 wt%, 12.9 wt%, 13.5 wt%, or 22.9 wt%.

[0089] Wherein, based on the total mass of phase B as 100 wt%, the total content of detergent auxiliaries B is greater than the total content of detergent auxiliaries A in phase A. Wherein, based on the total mass of phase B as 100 wt%, the total content of detergent auxiliaries B can be less than 50 wt%, less than 40 wt%, less than 30 wt%, less than 20 wt%, or less than 15 wt%, for example 9.5 wt%, 13.3 wt%, 28 wt%, or 29.5 wt%.

[0090] The bleaching activator generally refers to a compound that improves the bleaching effect of the bleaching agent. The bleaching activator can be a compound that generates an aliphatic percarboxylic acid and / or a substituted perbenzoic acid under hydrolytic conditions. Preferably, it is a polyacylated alkyl diamine, such as tetraacetylethylenediamine. The content of the bleaching activator is conventional in the art; based on 100 wt% of the total mass of phase A or phase B, the content of the bleaching activator is preferably 0-3 wt%, for example, 0.5 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, 2 wt%, or 2.5 wt%.

[0091] The chelating agent is conventional in the art, and its main function is to chelate trace metal ions, such as iron and copper, in water. These metal elements can cause discoloration; when the solid detergent contains a chelating agent, the non-ferrous metals are removed, thus achieving the effect of removing discoloration. The chelating agent can be added to the solid detergent as needed, without special limitation. The type of chelating agent can be conventional in the art, including but not limited to disodium ethylenediaminetetraacetate. The content of the chelating agent can be conventional in the art; based on 100 wt% of the total mass of phase A or phase B, the content of the chelating agent is preferably less than 0.5 wt%, for example, 0.1 wt%.

[0092] The filler can be conventional in the art, including but not limited to one or more of anhydrous sodium sulfate, sodium metasilicate, and starch. The anhydrous sodium sulfate can absorb water, preventing the effervescent agent from reacting under hygroscopic conditions, thus providing a certain protective effect. In a specific embodiment of the invention, based on 100wt% of the total mass of phase A or phase B, the content of anhydrous sodium sulfate can be 5-20wt%, for example, 8wt%, 10wt%, 10.5wt%, 11.1wt%, or 12wt%. The sodium metasilicate can increase the alkalinity of the solid detergent, thereby enhancing the washing effect. In a specific embodiment of the invention, based on 100wt% of the total mass of phase A or phase B, the content of sodium metasilicate can be 5-30wt%, for example, 8wt%, 10wt%, 15wt%, 20wt%, 24.6wt%, or 25wt%. The starch in the pressed washing block increases the volume, reduces the block density, and enhances the consumer's sensory experience. In a specific embodiment of the present invention, based on 100wt% of the total mass of phase A or phase B, the starch content can be less than 5wt%, for example, 1wt%, 1.5wt%, 2wt%, or 3wt%.

[0093] In order to enhance the fragrance of the solid detergent, fragrance is usually added. The content of the fragrance is generally less than 1 wt%, for example less than 0.5 wt%, based on 100 wt% of the total mass of phase A or phase B.

[0094] The protease can be conventional in the art. Based on a total mass of 100 wt% of phase A or phase B, the content of the protease can be less than 1 wt%, for example, 0.5 wt%.

[0095] Another aspect of the present invention provides a fabric washing block, which is the washing block described above.

[0096] Another aspect of the invention provides the application of the washing block or the laundry block in a washing machine for cleaning fabrics.

[0097] When the washing block of the present invention is added to water, the A phase rapidly dissolves, providing early cleaning and detergency with the surfactant, and preferably also providing bleach for better cleaning results. The remaining B phase, compared to the uniformly distributed pressed washing blocks in the prior art, rapidly decreases in volume and increases in specific surface area due to the rapid dissolution and release of the A phase, thus improving dissolution efficiency and extending the action time of the washing active ingredients (including surfactants).

[0098] Positive progress results:

[0099] (1) The solid detergent of the present invention forms two-phase or multi-phase detergent blocks or laundry sheets. By controlling the asymmetric distribution of surfactants and the total content of surfactants, the one phase with a lower surfactant content is rapidly dissolved and broken down. The remaining detergent blocks become thinner, the volume of the compressed blocks decreases rapidly, and the specific surface area increases. Water can penetrate and dissolve more effectively, shortening the dissolution time of the detergent blocks while maintaining high-efficiency detergency.

[0100] (2) The composition of the washing block of the present invention is combined with the high hardness of the washing block, which makes it less likely to break during transportation. Detailed Implementation

[0101] To make the technical means, inventive features, objectives, and effects of the invention readily understandable, the invention is further described below with reference to specific embodiments. However, the invention is not limited to the embodiments described below.

[0102] Unless otherwise specified, all percentages described in this article are expressed as mass percentages. When a content is above or below x%, unless otherwise specified, it indicates that the content is that mass percentage.

[0103] The compression instrument used in the following examples and comparative examples is: Shanghai Tianfan Pharmaceutical Machinery Manufacturing Plant, GZPK660 fully automatic double-discharge tablet press.

[0104] The laundry sheets prepared in the following examples and comparative examples were tested as follows, and the test results are recorded in Tables 1-4.

[0105] (1) Hardness test of compressed laundry detergent blocks: Six identical compressed laundry detergent blocks prepared in each example or comparative example were placed in an Erweka TBH 310 tablet hardness tester and radial pressure was applied. The crushing force of the compressed blocks was recorded as the hardness value of the laundry detergent blocks. (2) Dissolution time test: 500.0g of room temperature (about 20℃) DI water was weighed into a 1L beaker. A stirrer was placed in the beaker, with the stir bar about 3cm from the bottom of the beaker. The stirring speed was 100rpm. The laundry detergent blocks were added, and the dissolution time of the laundry detergent blocks was observed. The time when there was basically no residue in the solution was recorded as the dissolution time.

[0106] (3) Drop test: 20 laundry sheets prepared in the same embodiment were placed in the test. Place the laundry sheets (approximately 20cm x 14.9cm x 4.7cm) in a sealed bag, remove the air, and seal the bag. Drop the bag vertically from a height of 1.0 meter above the tiled floor. Repeat this process 3 times and record the number of damaged or broken sheets. The same drop test was also performed on laundry sheets prepared under different pressure conditions, as in Example 1.

[0107] (4) Stain Removal Power Test: The stain removal power test was conducted using an RHLQ vertical stain remover, referring to the relevant standard GB / T13174-2003 "Standards for Surfactants and Detergents 2005" for testing the stain removal value of detergents for clothing. Standard national standard soiled cloths were selected: JB01 (carbon black oil soiled cloth), JB02 (protein soiled cloth), and JB03 (sebum soiled cloth) as test soiled cloths. Three of each type were used, for a total of nine cloths / set. The laundry pads were added directly to the stain remover drum. Temperature: 30±0.5℃, rotation speed: 120rpm, time: 30min, hard water concentration: 250ppm, hard water volume: 1L / drum, rinsing time: 30s, drying method: natural flat drying.

[0108] For soiled fabrics of different national standards, the whiteness values ​​before and after rinsing are measured, and the difference is determined as the detergency value of the test product for that fabric. For the selected soiled fabric, its detergency value is compared with the corresponding standard detergent, and the ratio is calculated as the detergency of the test product for that fabric. The higher the ratio, the better the washing effect.

[0109] Stain removal power = Stain removal value of test product / Stain removal value of standard detergent = (Whiteness value of soiled cloth before washing - Whiteness value after washing) test product / (Whiteness value of soiled cloth before washing - Whiteness value after washing) standard detergent.

[0110] Example 1

[0111] Preparation of laundry detergent sheets: Weigh each material in phase A as shown in Table 1 and mix thoroughly. The actual total mass of the surfactants (sodium dodecyl sulfate 2 wt% and sodium dodecylbenzene sulfonate 2 * 0.9 wt%) in phase A accounts for 3.8 wt% of the total mass of phase A (100 wt%). Weigh each material in phase B as shown in Table 1 and mix thoroughly. The actual total mass of the surfactants (sodium dodecyl sulfate 2.5 wt% and sodium dodecylbenzene sulfonate 6 * 90 wt%) in phase B accounts for 7.9 wt% of the total mass of phase B. Add phases A and B to the mold of the tablet press in a 1:1 weight ratio. After adding phase A, perform the first pressing at a pressure of 8 kN / cm² for 1 second. Add phase B and perform a second pressing to obtain the laundry detergent sheets at a pressure of 20 kN / cm² for 1 second.

[0112] Comparative Example 1

[0113] Preparation of laundry blocks: After pre-weighing the materials of phase A and phase B as shown in Table 1, the two phases A and B are mixed evenly, and the materials are pressed in one go at a ratio of 1:1 of phase A to phase B to obtain laundry blocks without pre-pressing. The pressure is 20KN / cm².

[0114] Table 1

[0115]

[0116]

[0117] Drop test results :

[0118] Following the formulation and preparation method of Example 1, but differing from Example 1 in that the pressure of the first pre-compression was 30 N / cm², and the pressure of the second compression was 100 N / cm², resulting in laundry panel sample a. This sample, along with the laundry panel obtained in Example 1, underwent a drop test. Sample a was divided into three groups of 20 identical panels each. After the first, second, and third drops, the average number of panels damaged in each group was 15, 18, and 20, respectively. In contrast, the laundry panel of Example 1 was divided into three groups of 20 identical panels each. After the first, second, and third drops, the average number of panels damaged in each group was 0, 1, and 2, respectively.

[0119] Example 2

[0120] Preparation of laundry detergent blocks: Weigh each material of phase A as described in Table 2 and mix them evenly; weigh each material of phase B as described in Table 2 and mix them evenly. Weigh each phase according to its weight ratio. Phase A is first pre-pressed at a pressure of 10 kN / cm². Then, phase B is filled and pressed at a pressure of 40 kN / cm² to obtain laundry detergent blocks.

[0121] Comparative Examples 2-3

[0122] The materials in Comparative Examples 2 and 3 were weighed according to Table 2, and the preparation method was the same as in Example 2.

[0123] Table 2

[0124]

[0125]

[0126] Note: Soap powder (laurate / palmitate 20% / 80%) means that the soap powder contains 20% sodium laurate and 80% sodium palmitate.

[0127] Examples 3-5

[0128] Phase A and Phase B are prepared according to the materials in Table 3. The preparation method of the laundry detergent is the same as in Example 1.

[0129] Table 3

[0130]

[0131]

[0132] Examples 6-9

[0133] Preparation of laundry detergent sheets: Prepare phase A and phase B according to the materials in Table 4. The preparation method of laundry detergent sheets is the same as in Example 1.

[0134] Table 4

[0135]

[0136]

[0137] The comparison results of Example 1 and Comparative Example 1 show that if the materials of phase A and phase B are mixed evenly and then pressed, although the hardness of the laundry detergent block is similar, the lack of a clear two-phase structure prevents the phase with less surfactant from dissolving first, resulting in a longer overall dissolution time. Meanwhile, the drop test shows that the laundry detergent block produced by this invention has a hardness of over 100N, enabling it to maintain its integrity during transportation.

[0138] In Comparative Example 2, the mass proportion of phase A in the laundry detergent sheet is too large compared to phase B. Although phase A, due to its lower surfactant content, results in a shorter dissolution time, the relatively small amount of phase B with its high surfactant content leads to a significant decrease in detergency. In Comparative Example 3, the proportion of phase A is small, and the dissolution time is significantly increased. Even though phase B with its high surfactant content has a higher proportion, the significantly reduced detergency may be due to its poor dissolution ability.

[0139] Based on the test results of Examples 2-9, it can be seen that the laundry sheets prepared using the formula of this invention not only have high hardness and are not easily damaged during transportation, but also maintain strong detergency and a short dissolution time. Among them, Example 4, due to its higher surfactant content, although the complete dissolution time is slightly longer, still meets the requirements for machine washing, and its detergency is improved compared to Example 3 under 30-minute washing conditions.

[0140] Furthermore, the laundry pads produced by this invention are particularly suitable for the quick wash mode of washing machines. Tests were conducted using a 30-minute wash cycle and national standard testing on soiled fabric. For example, under the same pressure and washing conditions, laundry pads with an asymmetrically distributed surfactant content showed superior detergency compared to those with a symmetrically distributed surfactant content when using laundry pads with a surfactant content of 5.5 wt% or higher.

[0141] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A solid detergent, characterized in that, It includes component A and component B, wherein the mass ratio of component A to component B is (0.2-5):1; Component A includes surfactant A and effervescent agent A; based on a total mass of 100 wt% of component A, the mass percentage of surfactant A in component A is 0-6 wt%, but not 0 wt%. The component B includes surfactant B and effervescent agent B; based on a total mass of 100 wt% of the component B, the surfactant B accounts for at least 3 wt% of the mass percentage Y of the component B. Wherein, X and Y satisfy the following condition: YX is at least 3wt%; Based on 100 wt% of the solid detergent, the combined mass of surfactant A and surfactant B accounts for more than 4.5 wt% of the total mass of the solid detergent.

2. The solid detergent as described in claim 1, characterized in that, The solid detergent meets one or more of the following conditions: (1) The mass ratio of component A to component B is (0.3-4):1; (2) X is 0-5 wt% but not 0 wt%; (3) The Y content is 4 wt% or more; (4) X and Y satisfy: YX = 3.5-12.0 wt%; (5) Based on a total mass of 100 wt% of the solid detergent, the sum of the masses of surfactant A and surfactant B accounts for 5.5-20.0 wt% of the mass of the solid detergent.

3. The solid detergent as described in claim 2, characterized in that, The solid detergent meets one or more of the following conditions: (1) The mass ratio of component A to component B is 1:3, 2:3, 1:1, 2:1, 3:1 or 4:1; (2) The X is 3-5 wt%; (3) The Y is 7-15 wt%; (4) X and Y satisfy: YX = 7-11wt%; (5) Based on a total mass of 100 wt% of the solid detergent, the sum of the masses of surfactant A and surfactant B accounts for 5.5-13 wt% of the mass of the solid detergent.

4. The solid detergent as described in claim 3, characterized in that, The X is 3.4wt%, 3.5wt%, 3.8wt%, 4wt%, 4.2wt%, 4.25wt%, 4.45wt%, or 4.5wt%. And / or, the Y is 7.5wt%, 7.9wt%, 8wt%, 8.5wt%, 8.875wt%, 9wt%, 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, or 14.8wt%.

5. The solid detergent according to any one of claims 1-4, characterized in that, The solid detergent meets one or more of the following conditions: (1) The surfactant A includes anionic surfactants; (2) The effervescent agent A is an effervescent system that can generate carbon dioxide; (3) Based on a total mass of 100 wt% of component A, the effervescent agent A accounts for a mass percentage of 40-85 wt% of component A; (4) The surfactant B includes anionic surfactants; (5) The effervescent agent B is an effervescent system that can generate carbon dioxide; (6) Based on a total mass of 100 wt% of component B, the effervescent agent B accounts for a mass percentage of 30-85 wt% of component B; (7) The component A also contains bleaching agent A; based on the total mass of the component A being 100 wt%, the bleaching agent A accounts for 3-30 wt% of the mass of the component A; (8) The component B also contains bleaching agent B; based on a total mass of 100 wt% of the component B, the bleaching agent B accounts for 2-10 wt% of the mass of the component B. (9) Component A further contains detergent auxiliaries A, which include one or more of fillers, bleaching activators and fragrances; and / or, component B further contains detergent auxiliaries B, which include one or more of fillers, proteases, chelating agents, bleaching activators and fragrances.

6. A method for preparing a washing block, characterized in that, At least one or both of the components A and / or B as described in any one of claims 1-5 are independently pre-pressed and then pressed together to form a block, which is the washing block.

7. The method for preparing the washing block as described in claim 6, characterized in that, After the pre-compression molding of component A is performed, component B is added and then the compression molding is performed. And / or, the pressure of the compression molding is at least twice the pressure of the pre-compression molding.

8. A washing block, characterized in that, It is prepared by the method described in claim 6 or 7.

9. A washing block, characterized in that, It includes phase A and phase B, with a mass ratio of phase A to phase B of (0.2-5):1; one side of phase A is bonded to one side of phase B. Phase A includes surfactant A and effervescent agent A; based on a total mass of 100 wt% of phase A, the mass percentage of surfactant A in phase A is 0-6 wt%, but not 0 wt%. Phase B includes surfactant B and effervescent agent B; based on a total mass of 100 wt% of phase B, the surfactant B accounts for at least 3 wt% of phase B by mass Y. Wherein, X and Y satisfy the following condition: YX is at least 3wt%; Based on 100% of the washing block, the combined mass of surfactant A and surfactant B accounts for more than 4.5 wt% of the mass of the washing block.

10. The washing block as described in claim 9, characterized in that, The washing block satisfies one or more of the following conditions: (1) The mass ratio of phase A to phase B is (0.3-4):1; (2) X is 0-5 wt% but not 0 wt%; (3) The Y content is 4 wt% or more; (4) X and Y satisfy: YX = 3.5-12wt%; (5) Based on a total mass of 100wt% for the washing block, the sum of the masses of surfactant A and surfactant B accounts for 5.5-20wt% of the mass of the washing block; (6) The hardness of phase A is greater than that of phase B; (7) The washing block is a fabric washing block.

11. The washing block as described in claim 9, characterized in that, The washing block satisfies one or more of the following conditions: (1) Surfactant A includes anionic surfactants; surfactant B includes anionic surfactants; (2) The effervescent agent A is an effervescent system that can generate carbon dioxide; based on the total mass of phase A being 100wt%, the mass percentage of effervescent agent A in phase A is 40-85wt%. (3) The effervescent agent B is an effervescent system that can generate carbon dioxide; based on the total mass of the B phase being 100wt%, the mass percentage of the effervescent agent B in the B phase is 30wt%-85wt%. (4) Phase A also contains bleaching agent A; based on a total mass of 100wt% of phase A, the mass percentage of bleaching agent A in phase A is 3-30wt%; (5) Phase B also contains bleaching agent B; based on a total mass of 100 wt% of phase B, the bleaching agent B accounts for 2-10 wt% of the mass of phase B. (6) Phase A further contains detergent additive A; and / or, Phase B further contains detergent additive B; (7) The hardness of the washing block is 80N-200N.

12. The washing block as described in any one of claims 9-11, characterized in that, The washing block satisfies one or more of the following conditions: (1) The mass ratio of phase A to phase B is 1:3, 2:3, 1:1, 2:1, 3:1 or 4:1; (2) The X is 3.4wt%, 3.5wt%, 3.8wt%, 4wt%, 4.2wt%, 4.25wt%, 4.45wt%, or 4.5wt%; (3) The Y is 7.5wt%, 7.9wt%, 8wt%, 8.5wt%, 8.875wt%, 9wt%, 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, or 14.8wt%; (4) X and Y satisfy: YX = 7-11wt%; (5) Based on the total mass of the washing block as 100%, the sum of the masses of surfactant A and surfactant B accounts for 5.5-13 wt% of the mass of the washing block; (6) The hardness of the washing block is 100N, 105N, 110N, 120KN, 130N or 150KN.

13. The use of a washing block as described in any one of claims 8-12 for washing fabrics in a washing machine.

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