Washing machine groove cleaning tablet containing active oxygen as well as preparation method and application of washing machine groove cleaning tablet

Abstract

The invention relates to the technical field of daily chemical cleaning products, and particularly provides an active oxygen-containing washing machine tank cleaning tablet and a preparation method and application thereof, the active oxygen-containing washing machine tank cleaning tablet comprises a cleaning tablet main body and a coating layer at least coating the surface of the cleaning tablet main body, the coating layer comprises hydroxypropyl methyl cellulose, an antibacterial agent and an antioxidant; the cleaning sheet main body comprises a main body cleaning layer, a transition layer at least covering the upper surface of the main body cleaning layer, and a rapid disintegration layer at least covering the upper surface of the transition layer. Through the layered structural design, the cleaning tablet is stable in structure, the cleaning, sterilizing and peculiar smell removing effects are improved, the use stability and antibacterial continuity of the product are prolonged, the cleaning tablet body is structurally arranged through the quick disintegration layer, the transition layer and the body cleaning layer from top to bottom, ingredients can be released from outside to inside in a quick-to-slow mode, and the cleaning effect is good. Instant consumption of active substances is avoided, and cleaning efficiency and lasting time are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of daily chemical cleaning products, in particular, the present application provides a laundry machine tank cleaning tablet containing active oxygen and a preparation method and application thereof. BACKGROUND

[0002] With the wide popularity of washing machines, the internal hygiene problem has been increasingly concerned by users. During the long-term use of washing machines, due to frequent contact with moisture, detergent residues and clothing fibers, the inside of the washing machine, especially the inner drum, impeller gap, rubber sealing ring, drain pipe and other parts are prone to breed various microorganisms, such as mold, bacteria, etc. Among them, common pathogenic bacteria include Escherichia coli, Staphylococcus aureus, Candida albicans, etc. Not only can they cause washing machine odor, but also can cause skin allergy or cross infection after wearing clothes. In addition, a large amount of soap scum, clothing fibers, sebum stains and inorganic ion deposits will be left in the washing machine during operation. These substances, combined with the humid environment, provide a good breeding ground for microorganisms. If not cleaned regularly, dirt will continue to accumulate, affecting washing efficiency and machine life, and even causing corrosion of parts and increased energy consumption.

[0003] At present, the commonly used washing machine cleaning products on the market are mainly liquid or powder type cleaners. Although they have certain decontamination and sterilization effects, they still have many shortcomings in actual application. On the one hand, liquid cleaners are limited by storage conditions such as temperature and humidity, and their effective components (such as oxidizing agents and enzymes) are prone to degradation reactions, resulting in short product shelf life and unstable cleaning power. On the other hand, powder cleaners need to be manually measured when used, which is inconvenient and easy to absorb moisture and form lumps. At the same time, their solubility in water is limited, and the cleaning effect is easily affected by factors such as the location of the cleaning agent, water temperature and water volume, making it difficult to achieve uniform distribution and deep cleaning.

[0004] Therefore, it is urgent to develop a washing machine special cleaning product that is convenient to carry, dissolves quickly, has high stability, and has strong cleaning and broad-spectrum sterilization ability, in order to solve the limitations of the prior art and meet the comprehensive needs of users for household appliance hygiene, safety and convenience. SUMMARY

[0005] The present application aims to solve at least one of the above technical problems.

[0006] The application provides a laundry machine tank cleaning tablet containing active oxygen, which comprises a cleaning tablet body and a coating layer covering at least part of the surface of the cleaning tablet body, wherein the coating layer comprises hydroxypropyl methyl cellulose, an antibacterial agent and an antioxidant; the cleaning tablet body comprises a main cleaning layer, a transition layer covering at least part of the upper surface of the main cleaning layer and a rapid disintegration layer covering at least part of the upper surface of the transition layer; the main cleaning layer comprises sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose and polyethylene glycol; the transition layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine, an enzyme preparation, microcrystalline cellulose and polyethylene glycol; and the rapid disintegration layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine and an enzyme preparation.

[0007] In the technical solution, the thickness of the rapid disintegration layer is 2.0-3.0 mm; the thickness of the transition layer is 0.1-0.5 mm; the thickness of the main cleaning layer is 4.5-5.0 mm; and the thickness of the coating layer is 60-100 μm.

[0008] In any of the above technical solutions, the content of anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine and the enzyme preparation in the transition layer gradually decreases from the rapid disintegration layer to the main cleaning layer.

[0009] In any of the above technical solutions, the laundry machine tank cleaning tablet comprises, by mass fraction, 35-45 parts of sodium percarbonate, 15-20 parts of anhydrous citric acid, 10-20 parts of sodium carbonate, 15-20 parts of sodium bicarbonate, 3-10 parts of sodium citrate, 2-5 parts of polyethylene glycol, 0.5-2 parts of a surfactant, 3-14 parts of microcrystalline cellulose, 4-12 parts of tetraacetylethylenediamine, 1-6 parts of an enzyme preparation, 0.5-2.5 parts of hydroxypropyl methyl cellulose, 0.01-1 part of an antibacterial agent and 0.1-0.3 part of an antioxidant.

[0010] The application further provides a preparation method of the laundry machine tank cleaning tablet containing active oxygen.

[0011] S100, a first tabletting treatment is performed on the main cleaning layer mixed powder to obtain the main cleaning layer, the transition layer mixed powder is covered on at least part of the upper surface of the main cleaning layer, a second tabletting treatment is performed on the transition layer mixed powder using the rapid disintegration layer mixed powder, and finally drying treatment is performed to obtain the cleaning tablet body;

[0012] S200, the antioxidant and the antibacterial agent are added into the hydroxypropyl methyl cellulose aqueous solution, stirred uniformly and sprayed on the surface of the cleaning tablet body, and then dried to obtain the laundry machine tank cleaning tablet containing active oxygen;

[0013] The main body cleaning layer mixed powder comprises sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose and polyethylene glycol; the transition layer mixed powder comprises microcrystalline cellulose, polyethylene glycol, tetraacetylethylenediamine and an enzyme preparation; and the rapid disintegration layer mixed powder comprises anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine and an enzyme preparation.

[0014] In any of the technical solutions above, the preparation method of the main body cleaning layer mixed powder comprises:

[0015] S101, drying and uniformly mixing sodium carbonate, sodium citrate, microcrystalline cellulose and a surfactant to obtain a mixed powder;

[0016] S102, adding polyethylene glycol heated to a liquid state to the mixed powder and sequentially performing first stirring treatment and cooling treatment to obtain a mixed material;

[0017] S103, adding dried sodium percarbonate to the mixed material and performing second stirring treatment to obtain the main body cleaning layer mixed powder.

[0018] In S102 above, the polyethylene glycol is heated to 48-52 DEG C; in S102, the cooling treatment is cooled to below 25 DEG C; in S102, the particle size of the mixed material is 0.2-0.5 mm; and in S103, the temperature of the second stirring treatment is below 30 DEG C.

[0019] In any of the technical solutions above, the enzyme preparation comprises at least one of lipase and protease or a combination thereof; and the polyethylene glycol comprises polyethylene glycol 8000.

[0020] In S100 above, the pressure of the first tabletting treatment is 5-8 kN; and the pressure of the second tabletting treatment is 15-20 kN.

[0021] The application further provides a use of the active oxygen-containing washing machine tank cleaning tablet, such as the use of the active oxygen-containing washing machine tank cleaning tablet in any of the technical solutions above in cleaning a washing machine tank.

[0022] The technical effects achieved by the technical solutions of the application are as follows:

[0023] 1. The application realizes time sequence release, functional partition, structural stability, synergistic effect and other advantages of the cleaning tablet in use by virtue of the layered structure design and the selection of various functional components in each layer, greatly improves the cleaning, sterilization and odor removal effects, and prolongs the use stability and antibacterial persistence of the product, and is significantly superior to traditional single-layer structure cleaning tablets or liquid cleaning agents.

[0024] 2. The cleaning tablet body is arranged from top to bottom through the structure of the quick disintegration layer, the transition layer and the main cleaning layer, which can realize the release of components from fast to slow, from surface to inside, avoid the instantaneous consumption of active substances, and improve the cleaning efficiency and the holding time;

[0025] 3. A coating layer is further arranged outside the main cleaning tablet, and the HPMC in the coating layer forms a slow-release protective film, which can gradually dissolve in water, prolong the release time of the antibacterial agent, and realize the continuous inhibition of bacteria in the later cleaning or after cleaning;

[0026] 4. The preparation method of the present application separates the functional components by layering and surface coating process, avoids adverse reactions, and improves the release control and action efficiency of each layer component; two-step tabletting can realize the cooperation of quick disintegration and persistent cleaning, ensure the close combination between layers, and improve the stability of tablet structure. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The figure is a schematic diagram of a washing machine tank cleaning tablet containing active oxygen according to an embodiment of the present application;

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 1-coating layer, 2-cleaning tablet body, 21-quick disintegration layer, 22-transition layer, 23-main cleaning layer. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below in combination with specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below.

[0033] In the related art, during long-term use of a washing machine, microorganisms such as Escherichia coli and Staphylococcus aureus are likely to breed in parts such as an inner drum, a gap of a pulsator, and a rubber ring of the washing machine due to water residue, soap scum, and accumulation of fibers of clothes, and odor is generated and skin allergy or cross infection is likely to be caused. Meanwhile, dirt deposition also affects washing effect, shortens the service life of the machine, and increases energy consumption. Although the commonly used liquid or powder cleaning agent has a certain decontamination and sterilization effect, the liquid is prone to degradation and has limited preservation, and the powder has problems such as moisture absorption and caking, inconvenience in use, and insufficient dissolution in water, and it is difficult to achieve deep and long-acting cleaning requirements.

[0034] Therefore, the present application provides a washing machine tank cleaning tablet containing active oxygen and a preparation method and application thereof, by reasonably selecting the components and structure of the cleaning tablet and the preparation process matched with the structure, the stability of the active components is ensured and they are released layer by layer, thereby overcoming the problems of poor stability and inconvenience in use of the existing liquid or powder cleaning agent, having good cleaning, sterilization, decontamination, and long-term bacteriostatic effect, and being suitable for efficient deep cleaning of the washing machine tank.

[0035] Specifically, the present application provides a washing machine tank cleaning tablet containing active oxygen, comprising: a cleaning tablet main body and a coating layer at least coated on part of the surface of the cleaning tablet main body, the coating layer comprising: hydroxypropyl methyl cellulose, an antibacterial agent, and an antioxidant; the cleaning tablet main body comprising: a main cleaning layer, a transition layer at least covering part of the upper surface of the main cleaning layer, and a rapid disintegration layer at least covering part of the upper surface of the transition layer; the main cleaning layer comprising: sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose, and polyethylene glycol; the transition layer comprising: anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine, an enzyme preparation, microcrystalline cellulose, and polyethylene glycol; and the rapid disintegration layer comprising: anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine, and an enzyme preparation.

[0036] Preferably, the present application realizes the advantages of time release, functional partition, structural stability, and synergistic effect during the use of the cleaning tablet by designing a layered structure and selecting various functional ingredients in each layer. The present application not only greatly improves the cleaning, sterilization, and odor removal effects of the washing machine tank, but also prolongs the use stability and antibacterial persistence of the product, which is significantly better than the traditional single-layer structure cleaning tablet or liquid cleaner. In the main body of the cleaning tablet, sodium percarbonate and enzyme preparations and other components are prone to degradation if they coexist directly, so they are physically isolated by using a layered structure, which significantly improves the storage stability. From top to bottom, the structure arrangement of the rapid disintegration layer, the transition layer, and the main cleaning layer can realize the release of the components from fast to slow and from the surface to the inside, avoid the instantaneous consumption of active substances, improve the cleaning efficiency and the holding time, the rapid disintegration layer is composed of anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine, and enzyme preparations, which can quickly foam, enhance the water diffusion, achieve initial dirt removal and diffusion penetration, and provide preliminary acid-base reaction conditions, which helps to activate the enzyme activity; the addition of TAED can synergistically activate the subsequent release of sodium percarbonate, improving the utilization efficiency of cleaning oxygen; and the enzyme preparation is released again to pretreat grease pollution.

[0037] Further, the transition layer includes anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine, enzyme preparations, microcrystalline cellulose, and polyethylene glycol, which are mainly used to control the release and structure of the rapid disintegration layer and the main cleaning layer. The microcrystalline cellulose improves the stability of the tablet structure, and the PEG helps to disintegrate and wet, which can balance the reaction speed and protect the complete release of the main layer components.

[0038] Further, the main cleaning layer mainly includes sodium percarbonate, sodium carbonate, surfactant, sodium citrate, microcrystalline cellulose, and polyethylene glycol, which are rich in active oxygen and alkaline builders such as sodium carbonate, which can be used for deep oxidation and dirt removal, sterilization, and deodorization; the surfactant reduces the interfacial tension and assists in oil emulsification; sodium citrate can adjust the pH of the system, gently neutralize the acid-base reaction byproducts, and improve the cleaning feeling; MCC and PEG improve the tablet strength and disintegration in water.

[0039] Preferably, a coating layer is further provided outside the main cleaning tablet, which is composed of hydroxypropyl methyl cellulose, antibacterial agent and antioxidant. HPMC forms a slow-release protective film, which can gradually dissolve in water, prolong the release time of the antibacterial agent, and achieve sustained inhibition of bacteria in the later cleaning or after cleaning. The HPMC is preferably high-viscosity HPMC, with a viscosity of 3000-5600 mPa·s. When it comes into contact with water, it quickly swells to form a gel film but does not dissolve. The gel film can limit the penetration of water, so that the rapid disintegration layer and the main cleaning layer are released faster. With the passage of time, the coating gradually thins, and the antibacterial ingredients are slowly released, thereby achieving long-term antibacterial effect. The antibacterial agent can inhibit the regrowth of residual microorganisms. Preferably, it is a mixture of natural antibacterial agents such as chitosan, plant essential oil and grapefruit seed extract, which can not only exist stably in an alkaline environment and adhere to the inner surface of the washing machine to achieve long-term and stable antibacterial effect, but also can give the cleaning tablet a certain aroma to enhance the user experience. The antioxidant protects the active ingredients from being oxidized prematurely, prolongs the shelf life and use efficiency, and is preferably L-ascorbic acid sodium and / or vitamin E, which is safe, non-irritating and has good antioxidant properties.

[0040] Preferably, the thickness of the rapid disintegration layer is 2.0-3.0 mm; the thickness of the transition layer is 0.1-0.5 mm; the thickness of the main cleaning layer is 4.5-5.0 mm; and the thickness of the coating layer is 60-100 μm.

[0041] Preferably, when in use, the washing machine tank cleaning tablet containing active oxygen is put into the washing machine tank. The coating layer absorbs water and swells to form a gel state, but does not dissolve immediately, but forms a temporary physical barrier to control the rate of water penetration into the inner layer, and at the same time protects the antibacterial agent and antioxidant in it from being released immediately or damaged by active oxygen in water. After the water penetrates the coating layer, it enters the rapid disintegration layer, which contains a high proportion of anhydrous citric acid and sodium bicarbonate. When it comes into contact with water, it immediately reacts to produce gas, which can quickly generate a large number of bubbles and achieve rapid cracking and disintegration, while releasing part of the enzyme and TAED to initiate the initial cleaning reaction. The transition layer contains a small amount of foaming agent, PEG and enzyme preparation, which starts to contact water after the rapid disintegration layer is broken, and releases slower than the rapid disintegration layer, playing a role in adjusting the overall tablet decomposition rate. The main cleaning layer disintegrates last to release peroxycarbonate sodium, alkaline salt, surfactant and other main cleaning ingredients, achieving deep cleaning, sterilization and deodorization, and relying on a long-lasting release to maintain the intensity and time efficiency of the cleaning process. After the main cleaning layer has basically disintegrated, the cleaning reaction enters the sustained phase, at which time the coating layer begins to dissolve, and the antibacterial agent and antioxidant are gradually released, avoiding the antibacterial agent and antioxidant from being damaged by active oxygen in the main cleaning stage and failing to achieve antibacterial effect. Before the washing machine is drained, the coating layer residue further spreads on the surface of the tank wall to form a bacteriostatic protective film, thereby achieving a long-term antibacterial effect.

[0042] Further, the active oxygen-containing washing machine tank cleaning tablet comprises, by mass fraction, sodium percarbonate 35-45 parts, anhydrous citric acid 15-20 parts, sodium carbonate 10-20 parts, sodium bicarbonate 15-20 parts, sodium citrate 3-10 parts, polyethylene glycol 2-5 parts, a surfactant 0.5-2 parts, microcrystalline cellulose 3-14 parts, tetraacetylethylenediamine 4-12 parts, an enzyme preparation 1-6 parts, hydroxypropyl methyl cellulose 0.5-2.5 parts, an antibacterial agent 0.01-1 part, and an antioxidant 0.1-0.3 part.

[0043] Preferably, the active oxygen-containing washing machine tank cleaning tablet of the present application builds a multi-level and synergistic cleaning system through the types and proportions of the components. The sodium percarbonate and the tetraacetylethylenediamine synergistically release active oxygen, improving the oxidative stain removal and bacteria removal effects. The sodium bicarbonate and the anhydrous citric acid form a slow-release foaming system, which, in combination with the sodium citrate, adjusts the reaction intensity, achieving gentle cleaning and stable components. The enzyme preparation and the surfactant synergistically act to deeply decompose organic stains and biological residues. The polyethylene glycol and the microcrystalline cellulose optimize the molding and dissolution performance, ensuring the disintegration speed and stability. The natural antibacterial agent and the antioxidant are embedded in the hydroxypropyl methyl cellulose, achieving slow-release antibacterial and long-term protection. The overall formula structure is reasonable and synergistically efficient, taking into account immediate cleaning and persistent antibacterial, solving the problems of unstable components, inconvenience of use, and single action of traditional cleaning agents.

[0044] Preferably, sodium percarbonate is the main cleaning ingredient, which generates hydrogen peroxide and sodium carbonate after dissolving in water, and is the main source of active oxygen. A large amount of sodium percarbonate can provide sufficient active oxygen, which can oxidize and decompose mold, bacteria, organic dirt and biofilm, play a role in sterilization and odor removal, and is especially suitable for the inner environment of washing machines with obvious mold odor. Anhydrous citric acid can react with sodium bicarbonate to produce gas, mechanically strip dirt, thereby reducing scale formation, dissolving inorganic deposits such as calcium and magnesium salts, and an appropriate amount of anhydrous citric acid can provide an acid-base buffer environment, stabilize peroxide decomposition, and make the reaction rate appropriate. Sodium carbonate can increase the alkalinity of the aqueous solution, enhance the emulsification and dissolution capacity of dirt, thereby stabilizing hydrogen peroxide and improving the cleaning effect of sodium peroxide, and also can coordinate enzyme stability and bleaching system. Sodium bicarbonate is the main component to promote the dissolution, dispersion and diffusion of the cleaning tablet, which makes the cleaning tablet gently effervesce and avoids tablet cracking. Sodium citrate can bind calcium and magnesium ions in water to prevent scale deposition, thereby improving surfactant performance and enhancing the wettability of the cleaning solution. When the amount of sodium citrate and sodium bicarbonate is close, the foaming intensity can be controlled, the risk of instantaneous foam burst can be reduced, and the tablet structure can be prevented from being damaged prematurely due to intense effervescent reaction. Polyethylene glycol (PEG) can promote tablet forming and enhance ingredient adhesion, thereby improving the disintegration speed of the tablet in water, stabilizing heat- or water-sensitive ingredients such as enzymes and essential oils, and building a uniform internal structure with microcrystalline cellulose. PEG is preferably polyethylene glycol 8000, which has better stability than low molecular weight PEG, is not prone to migration, is not prone to degradation during storage and use, helps to prolong the shelf life of the product, and has a certain protective effect on enzymes, can form a stable microenvironment at the initial stage of hydration, and prevent enzyme inactivation or premature release. Surfactants can emulsify oil, disperse particulate dirt, and enhance the spreading of the cleaning solution on the inner wall surface. The amount of surfactant is small, the comprehensive decontamination capacity of the reinforced formula can be enhanced, and the cleaning power can be enhanced by cooperating with the foam generated by effervescence. Microcrystalline cellulose (MCC) can control the mechanical strength of the tablet, facilitate tabletting, assist in the disintegration of the cleaning tablet and the diffusion of reactants, and can form a porous structure for the cleaning tablet, which is conducive to ingredient release. Tetraacetylethylenediamine (TAED) is an active oxygen synergist that reacts with hydrogen peroxide to form peracetic acid, significantly improving the sterilization capacity, and still efficiently reacts under low temperature conditions, especially suitable for winter or cold water cleaning scenarios. Enzyme preparations can improve the decontamination range and extend the antibacterial effect. Although the amount of enzyme preparation is small, it has a significant decomposition effect on complex stains, can complement the oxygen system without causing antagonism, and the enzyme of the enzyme preparation is preferably at least one of lipase and protease or a combination thereof. Lipase can hydrolyze lipid stains such as sebum, oil, fatty acids, etc. on clothes and washing machine tank walls, effectively remove oil stains and sebum residues, and protease is used to decompose protein stains formed by skin metabolites, sweat, mold metabolites, etc., which helps to remove stubborn stains and odor sources.Hydroxypropyl methyl cellulose (HPMC) as the outer layer of the cleaning tablet can control the dissolution rate of the cleaning tablet, carry the antibacterial agent and the antioxidant, form a protective layer to block moisture, and stabilize the structure of the tablet; the antibacterial agent can inhibit the growth of mold and bacteria in the washing machine tank, keep the inner wall of the washing machine clean, and prevent cross infection; the antioxidant can inhibit the degradation of enzymes, active oxygen and other components, and prolong the storage period of the product.

[0045] In some embodiments of the present application, a preparation method of a washing machine tank cleaning tablet containing active oxygen comprises the following steps:

[0046] S100, a main cleaning layer mixed powder is used for first tabletting treatment to obtain a main cleaning layer, a transition layer mixed powder is covered on at least part of the upper surface of the main cleaning layer, and then a rapid disintegration layer mixed powder is used for second tabletting treatment on the transition layer mixed powder, and finally drying treatment is performed to obtain a cleaning tablet main body;

[0047] S200, an antioxidant and an antibacterial agent are added to a hydroxypropyl methyl cellulose aqueous solution, stirred uniformly, and then sprayed on the surface of the cleaning tablet main body, and after drying, a washing machine tank cleaning tablet containing active oxygen is obtained.

[0048] Preferably, the preparation method of the present application separates the functional components by the process of layered tabletting and surface coating, avoids adverse reactions, and improves the release control and action efficiency of each layer component; the two-step tabletting can realize the synergy of rapid disintegration and persistent cleaning, ensure the close combination between layers, and improve the stability of tablet structure. In step S100, first, the main cleaning layer mixed powder is subjected to first tabletting treatment to obtain the main cleaning layer, and the main cleaning layer mixed powder comprises: sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose and polyethylene glycol, and the pressure of the first tabletting treatment is 5-8 kN. This pressure range is conducive to maintaining the physical form of active components such as sodium percarbonate, preventing thermal degradation, moisture aggregation or caking, etc. due to excessive compaction under excessive pressure, and can also ensure that the main layer has a certain structural strength, which is beneficial to the tabletting of the upper layer and prevents the tablet from breaking; then a layer of transition layer mixed powder is covered on the upper surface of the main cleaning layer, and the transition layer mixed powder comprises: microcrystalline cellulose, polyethylene glycol, tetraacetyl ethylenediamine and enzyme preparation, which are uniformly mixed in a dry state to obtain the transition layer mixed powder, which can be uniformly sprinkled, and after sprinkling, it does not need to be compacted, and the rapid disintegration layer mixed powder is directly covered thereon for second tabletting treatment, so that the rapid disintegration layer and the transition layer are formed on the main cleaning layer by the second tabletting treatment. The rapid disintegration layer mixed powder comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine and enzyme preparation, which are uniformly mixed in a dry state to obtain the rapid disintegration layer mixed powder; since the transition layer mixed powder is not compacted after sprinkling, the transition layer mixed powder remains in a loose state, and a small amount of rapid disintegration layer mixed powder will be pressed into the loose transition layer mixed powder during the second tabletting treatment. Even though the transition layer mixed powder does not contain anhydrous citric acid and sodium bicarbonate, a small amount of anhydrous citric acid and sodium bicarbonate is pressed into the transition layer during the second tabletting treatment due to the presence of anhydrous citric acid and sodium bicarbonate in the rapid disintegration layer mixed powder; the second tabletting treatment not only enhances the bonding force between the prepared rapid disintegration layer and the transition layer, but also allows a certain gradient structure to appear in the transition layer, i.e. the content of anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine and enzyme preparation in the transition layer gradually decreases from the rapid disintegration layer to the main cleaning layer; and the pressure of the second tabletting treatment is 15-20 kN, which can make the rapid disintegration layer, the transition layer and the main cleaning layer fully compacted, form a dense contact interface, improve the mechanical bonding force between the layers, and prevent the cleaning tablet from falling off, breaking or delaminating between layers during transportation, storage and use.

[0049] Further, in the transition layer, microcrystalline cellulose mainly plays a supporting role, and the content of microcrystalline cellulose in the entire transition layer hardly changes, so the mass ratio of microcrystalline cellulose, tetraacetylethylenediamine, enzyme preparation, anhydrous citric acid, sodium bicarbonate and polyethylene glycol near the rapid disintegration layer of the transition layer is 1:1:1:(0.05-0.1):(0.05-0.1):(0.05-0.2); the mass ratio of microcrystalline cellulose, tetraacetylethylenediamine, enzyme preparation and polyethylene glycol near the main cleaning layer of the transition layer is 1:(0.08-0.01):(0.08-0.15):(0.2-0.25), because a small amount of rapid disintegration layer mixed powder is pressed into the loose transition layer during the second tabletting process, but not too deep, thereby forming a gradient structure in the transition layer, that is, the content of tetraacetylethylenediamine, enzyme preparation, anhydrous citric acid and sodium bicarbonate is higher near the rapid disintegration layer of the transition layer, and lower near the main cleaning layer; anhydrous citric acid and sodium bicarbonate will not be pressed too much into the transition layer, so anhydrous citric acid and sodium bicarbonate only exist near the rapid disintegration layer of the transition layer and gradually decrease, and there is no anhydrous citric acid and sodium bicarbonate near the main cleaning layer of the transition layer; and during tabletting, because PEG itself has certain softness and plasticity, when high pressure is applied, PEG may penetrate downward along the pressure gradient or void space, showing slight migration from the upper layer to the middle and lower layers, and PEG is preferably PEG 8000, which is easy to deposit downward due to its large molecular weight, so the content of PEG is higher near the main cleaning layer of the transition layer than near the rapid disintegration layer.

[0050] Preferably, in step S200, the antioxidant and antibacterial agent are added to the hydroxypropyl methylcellulose aqueous solution and stirred uniformly, and then a coating layer is formed on the surface of the main cleaning layer by spraying, which can accurately control the spraying thickness and the uniformity of the coating layer, and the antibacterial agent and antioxidant, which are sensitive to temperature or tabletting pressure, are added by spraying, which can avoid inactivation during tabletting and improve the activity retention rate.

[0051] Preferably, the preparation method of the main cleaning layer mixed powder comprises:

[0052] S101, dry and uniformly mix sodium carbonate, sodium citrate, microcrystalline cellulose and a surfactant to obtain a mixed powder;

[0053] S102, heat polyethylene glycol to a liquid state, then add the mixed powder and sequentially perform first stirring treatment and cooling treatment to obtain a mixture;

[0054] S103, add dry sodium percarbonate to the mixture and perform second stirring treatment to obtain the main cleaning layer mixed powder.

[0055] Preferably, the main cleaning layer mixed powder is prepared by a step-by-step method rather than directly mixing all components at one time, because sodium carbonate peroxide as a strong oxidizing agent is sensitive to heat and humidity, and if it is added when the mixture temperature is high or the polyethylene glycol is still in a liquid state, it is easy to decompose and lose effectiveness. Moreover, if PEG and other powders are directly mixed, it will cause uneven stirring, unstable particle structure, easy stratification, and poor flowability. Therefore, the main cleaning layer mixed powder needs to be prepared in steps. First, sodium carbonate, sodium citrate, microcrystalline cellulose, and surfactant are mixed uniformly after drying to ensure uniform distribution of microcrystalline cellulose and sodium carbonate, providing a foundation for subsequent PEG wrapping or penetration, avoiding moisture clumping when liquid PEG is added later, and being conducive to maintaining the flowability and stability of the powder; then the PEG is heated to a liquid state, preferably to 48-52℃, which is a mild interval for PEG near melting without causing thermal degradation, enabling PEG to have good wetting, coating, and dispersion ability. Adding the powder and stirring in this state can make PEG uniformly coat the powder particle surface, which is conducive to enhancing the binding property and tablet forming property of the powder; cooling to below 25℃ can make PEG re-solidify, which is conducive to forming a stable particle structure with a particle size of 0.2-0.5mm, facilitating the subsequent addition of dry powder and tabletting; finally, dry sodium carbonate peroxide is added and stirred at a temperature below 30℃ to avoid decomposition at high temperature or in a humid heat state, which releases oxygen and affects the stability of the formula, ensuring mixing at a safe temperature to prevent sodium carbonate peroxide from degrading and reducing the impact on other easily decomposed components.

[0056] Example 1

[0057] The present embodiment provides a laundry machine tank cleaning tablet containing active oxygen, which comprises, by mass fraction: sodium carbonate peroxide: 35 parts, anhydrous citric acid: 15 parts, sodium carbonate: 10 parts, sodium bicarbonate: 15 parts, sodium citrate: 3 parts, polyethylene glycol 8000: 2 parts, surfactant: 0.5 parts, microcrystalline cellulose: 3 parts, tetraacetyl ethylenediamine: 4 parts, enzyme preparation: 1 part, hydroxypropyl methyl cellulose: 0.5 parts, antibacterial agent: 0.01 parts, and antioxidant: 0.1 parts.

[0058] The laundry machine tank cleaning tablet containing active oxygen comprises a cleaning tablet body and a coating layer covering at least part of the surface of the cleaning tablet body. The coating layer comprises hydroxypropyl methyl cellulose, an antibacterial agent, and an antioxidant. The cleaning tablet body comprises a main cleaning layer, a transition layer covering at least part of the upper surface of the main cleaning layer, and a rapid disintegration layer covering at least part of the upper surface of the transition layer. The main cleaning layer comprises sodium carbonate peroxide, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose, and polyethylene glycol. The transition layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine, enzyme preparation, microcrystalline cellulose, and polyethylene glycol. The rapid disintegration layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine, and enzyme preparation.

[0059] The thickness of the fast disintegration layer is 2.0 mm; the thickness of the transition layer is 0.1 mm; the thickness of the main cleaning layer is 4.5 mm; and the thickness of the coating layer is 60 μm;

[0060] The enzyme preparation is protease, the antibacterial agent is a mixture of chitosan, plant essential oil and grapefruit seed extract, and the antioxidant is L-sodium ascorbate.

[0061] Embodiment 2

[0062] The embodiment provides a laundry tub cleaning tablet containing active oxygen, which comprises, in parts by mass: sodium percarbonate 45 parts, anhydrous citric acid 20 parts, sodium carbonate 20 parts, sodium bicarbonate 20 parts, sodium citrate 10 parts, polyethylene glycol 5 parts, a surfactant 2 parts, microcrystalline cellulose 14 parts, tetraacetylethylenediamine 12 parts, an enzyme preparation 6 parts, hydroxypropyl methyl cellulose 2.5 parts, an antibacterial agent 1 part, and an antioxidant 0.3 part.

[0063] The laundry tub cleaning tablet containing active oxygen comprises a cleaning tablet body and a coating layer covering at least part of the surface of the cleaning tablet body. The coating layer comprises hydroxypropyl methyl cellulose, an antibacterial agent and an antioxidant. The cleaning tablet body comprises a main cleaning layer, a transition layer covering at least part of the upper surface of the main cleaning layer, and a fast disintegration layer covering at least part of the upper surface of the transition layer. The main cleaning layer comprises sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose and polyethylene glycol. The transition layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine, an enzyme preparation, microcrystalline cellulose and polyethylene glycol. The fast disintegration layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine and an enzyme preparation.

[0064] The thickness of the fast disintegration layer is 3.0 mm; the thickness of the transition layer is 0.5 mm; the thickness of the main cleaning layer is 5.0 mm; and the thickness of the coating layer is 100 μm.

[0065] The enzyme preparation is protease, the antibacterial agent is a mixture of chitosan, plant essential oil and grapefruit seed extract, and the antioxidant is L-sodium ascorbate.

[0066] Embodiment 3

[0067] The embodiment provides a laundry tub cleaning tablet containing active oxygen, which comprises, in parts by mass: sodium percarbonate 40 parts, anhydrous citric acid 18 parts, sodium carbonate 15 parts, sodium bicarbonate 17 parts, sodium citrate 5 parts, polyethylene glycol 3 parts, a surfactant 1 part, microcrystalline cellulose 10 parts, tetraacetylethylenediamine 10 parts, an enzyme preparation 5 parts, hydroxypropyl methyl cellulose 1 part, an antibacterial agent 0.1 part, and an antioxidant 0.2 part.

[0068] The active oxygen-containing washing machine tank cleaning tablet comprises a cleaning tablet main body and a coating layer covering at least part of the surface of the cleaning tablet main body, the coating layer comprising hydroxypropyl methyl cellulose, an antibacterial agent and an antioxidant; the cleaning tablet main body comprises a main body cleaning layer, a transition layer covering at least part of the upper surface of the main body cleaning layer, and a rapid disintegration layer covering at least part of the upper surface of the transition layer; the main body cleaning layer comprises sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose and polyethylene glycol; the transition layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine, an enzyme preparation, microcrystalline cellulose and polyethylene glycol; and the rapid disintegration layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine and an enzyme preparation.

[0069] The thickness of the rapid disintegration layer is 2.5 mm; the thickness of the transition layer is 0.3 mm; the thickness of the main body cleaning layer is 4.8 mm; and the thickness of the coating layer is 80 μm.

[0070] The enzyme preparation is lipase and protease, the antibacterial agent is a mixture of chitosan, plant essential oil and grapefruit seed extract, and the antioxidant is vitamin E and L-ascorbic acid sodium.

[0071] Embodiment 4

[0072] The active oxygen-containing washing machine tank cleaning tablet comprises a cleaning tablet main body and a coating layer covering at least part of the surface of the cleaning tablet main body, the coating layer comprising hydroxypropyl methyl cellulose, an antibacterial agent and an antioxidant; the cleaning tablet main body comprises a main body cleaning layer, a transition layer covering at least part of the upper surface of the main body cleaning layer, and a rapid disintegration layer covering at least part of the upper surface of the transition layer; the main body cleaning layer comprises sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose and polyethylene glycol; the transition layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine, an enzyme preparation, microcrystalline cellulose and polyethylene glycol; and the rapid disintegration layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine and an enzyme preparation.

[0073] The active oxygen-containing washing machine tank cleaning tablet comprises a cleaning tablet main body and a coating layer covering at least part of the surface of the cleaning tablet main body, the coating layer comprising hydroxypropyl methyl cellulose, an antibacterial agent and an antioxidant; the cleaning tablet main body comprises a main body cleaning layer, a transition layer covering at least part of the upper surface of the main body cleaning layer, and a rapid disintegration layer covering at least part of the upper surface of the transition layer; the main body cleaning layer comprises sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose and polyethylene glycol; the transition layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine, an enzyme preparation, microcrystalline cellulose and polyethylene glycol; and the rapid disintegration layer comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine and an enzyme preparation.

[0074] The thickness of the rapid disintegration layer is 2.8 mm; the thickness of the transition layer is 0.4 mm; the thickness of the main body cleaning layer is 4.7 mm; and the thickness of the coating layer is 75 μm.

[0075] The enzyme preparation is a mixture of lipase and protease, the antibacterial agent is a mixture of chitosan, plant essential oil and grapefruit seed extract, and the antioxidant is a mixture of vitamin E and sodium L-ascorbate.

[0076] Example 5

[0077] The embodiment provides a preparation method of a washing machine tank cleaning tablet containing active oxygen, and the method comprises the following steps:

[0078] S100, a main cleaning layer mixed powder is used to perform first tabletting treatment under a pressure of 5kN to obtain a main cleaning layer, a transition layer mixed powder is used to cover at least part of the upper surface of the main cleaning layer, and then a rapid disintegration layer mixed powder is used to perform second tabletting treatment on the transition layer mixed powder under a pressure of 15kN, and finally drying treatment is performed to obtain a cleaning tablet main body;

[0079] S200, vitamin E and a mixture of chitosan, plant essential oil and grapefruit seed extract are added into a hydroxypropyl methylcellulose aqueous solution and stirred uniformly, and then spraying treatment is performed on the surface of the cleaning tablet main body, and finally drying is performed to obtain the washing machine tank cleaning tablet containing active oxygen;

[0080] The main cleaning layer mixed powder comprises sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose and polyethylene glycol 8000; the transition layer mixed powder comprises microcrystalline cellulose, polyethylene glycol 8000, tetraacetylethylenediamine and protease, and the transition layer mixed powder is obtained by uniformly mixing the above components in a dry state; and the rapid disintegration layer mixed powder comprises anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine and protease, and the rapid disintegration layer mixed powder is obtained by uniformly mixing the above components in a dry state.

[0081] The preparation method of the main cleaning layer mixed powder comprises the following steps:

[0082] S101, sodium carbonate, sodium citrate, microcrystalline cellulose and a surfactant are dried and then uniformly mixed to obtain a mixed powder;

[0083] S102, polyethylene glycol 8000 is heated to 50℃, and then added into the mixed powder to perform first stirring treatment and cooling treatment to below 25℃ in sequence, so that a mixed material with a particle size of 0.2mm is obtained;

[0084] S103, dried sodium percarbonate is added into the mixed material to perform second stirring treatment at below 30℃, so that the main cleaning layer mixed powder is obtained.

[0085] Example 6

[0086] The embodiment provides a preparation method of a washing machine tank cleaning tablet containing active oxygen, and the method comprises the following steps:

[0087] S100, after the main body cleaning layer mixed powder is used to carry out the first tablet processing under the pressure of 8kN to obtain the main body cleaning layer, the transition layer mixed powder is covered on at least part of the upper surface of the main body cleaning layer, and then the fast disintegrating layer mixed powder is used to carry out the second tablet processing on the transition layer mixed powder under the pressure of 20kN, and finally, drying processing is carried out to obtain the cleaning tablet main body;

[0088] S200, the mixture of L-sodium ascorbate and chitosan, plant essential oil and grapefruit seed extract is added into the hydroxypropyl methyl cellulose aqueous solution and stirred uniformly, the surface of the cleaning tablet main body is subjected to the spraying processing, and after drying, the cleaning tablet for washing machine tank containing active oxygen is obtained;

[0089] The main body cleaning layer mixed powder comprises sodium percarbonate, sodium carbonate, a surfactant, sodium citrate, microcrystalline cellulose and polyethylene glycol 8000; the transition layer mixed powder comprises microcrystalline cellulose, polyethylene glycol 8000, tetraacetyl ethylenediamine and lipase, which are mixed uniformly in a dry state to obtain the transition layer mixed powder; the fast disintegrating layer mixed powder comprises anhydrous citric acid, sodium bicarbonate, tetraacetyl ethylenediamine and lipase, which are mixed uniformly in a dry state to obtain the fast disintegrating layer mixed powder;

[0090] The preparation method of the main body cleaning layer mixed powder comprises:

[0091] S101, after the sodium carbonate, sodium citrate, microcrystalline cellulose and surfactant are dried, they are mixed uniformly to obtain a mixed powder;

[0092] S102, after the polyethylene glycol 8000 is heated to 52℃, it is added into the mixed powder, and first stirring processing and cooling processing to below 25℃ are sequentially carried out, so that the mixed material with a particle size of 0.5mm is obtained;

[0093] S103, the dried sodium percarbonate is added into the mixed material, and second stirring processing is carried out at below 30℃ to obtain the main body cleaning layer mixed powder.

[0094] Example 7

[0095] The embodiment provides a preparation method of a cleaning tablet for washing machine tank containing active oxygen, which comprises the following steps:

[0096] S100, after the main body cleaning layer mixed powder is used to carry out the first tablet processing under the pressure of 6kN to obtain the main body cleaning layer, the transition layer mixed powder is covered on at least part of the upper surface of the main body cleaning layer, and then the fast disintegrating layer mixed powder is used to carry out the second tablet processing on the transition layer mixed powder under the pressure of 18kN, and finally, drying processing is carried out to obtain the cleaning tablet main body;

[0097] S200: Add a mixture of vitamin E, sodium L-ascorbate, chitosan, plant essential oil and grapefruit seed extract to an aqueous solution of hydroxypropyl methylcellulose and stir until homogeneous. Spray the mixture onto the surface of the cleaning sheet body and dry to obtain a washing machine tub cleaning sheet containing active oxygen.

[0098] The main cleaning layer mixed powder includes: sodium percarbonate, sodium carbonate, surfactant, sodium citrate, microcrystalline cellulose, and polyethylene glycol 8000; the transition layer mixed powder includes: microcrystalline cellulose, polyethylene glycol 8000, tetraacetylethylenediamine, lipase, and protease, which are mixed evenly in a dry state to obtain the transition layer mixed powder; the rapidly disintegrating layer mixed powder includes anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine, protease, and lipase, which are mixed evenly in a dry state to obtain the rapidly disintegrating layer mixed powder.

[0099] The preparation methods of the main cleaning layer mixed powder include:

[0100] S101. Sodium carbonate, sodium citrate, microcrystalline cellulose and surfactant are dried and then mixed evenly to obtain a mixed powder;

[0101] S102. After heating polyethylene glycol 8000 to 48°C, add it to the mixed powder and perform the first stirring treatment and cooling treatment to below 25°C in sequence to obtain a mixture with a particle size of 0.4 mm.

[0102] S103. Add dry sodium percarbonate to the mixture and perform a second stirring treatment at a temperature below 30°C to obtain the main clean layer mixed powder.

[0103] Performance testing

[0104] Appearance inspection: Observe the appearance of the washing machine tub cleaning sheets containing active oxygen in Examples 1-4, and check whether the washing machine tub cleaning sheets containing active oxygen are sheets with uniform color and no obvious visible mechanical impurities.

[0105] pH test: Dissolve the washing machine tub cleaning tablets containing active oxygen from Examples 1-4 in water to prepare a 1% aqueous solution, and measure its pH value at 25°C.

[0106] Active oxygen content test: The active oxygen-containing washing machine tank cleaning tablets of Examples 1-4 were ground into a uniform powder, 10 g of each was sampled and moved into a 2 L beaker, a single scale volumetric flask was filled with water at 35-40 °C to the scale and added to the sample, a mechanical stirrer was used to stir for 3 min to dissolve the sample to obtain a solution of the active oxygen-containing washing machine tank cleaning tablets, during the dissolution operation, 50 ml of sulfuric acid solution was placed in a conical flask, the potassium permanganate standard titration solution was added dropwise until a light pink color that did not fade appeared, 100 ml of the active oxygen-containing washing machine tank cleaning tablet solution was removed with a pipette into the conical flask, and the potassium permanganate standard titration solution was titrated to a light pink color. No fading for at least 15 s, and the active oxygen content was calculated according to the following formula (active oxygen content in percentage),

[0107]

[0108] wherein V is the volume of the potassium permanganate standard solution used for titration (mL), C is the concentration of the potassium permanganate standard solution used for titration (mol / L), and m is the sample mass (mg);

[0109] The test results are shown in Table 1.

[0110] Table 1

[0111]

[0112] Disintegration time test: The active oxygen-containing washing machine tank cleaning tablets of Examples 1-4 were tested for disintegration rate by being placed in water at 40 °C;

[0113] Active oxygen retention rate: The active oxygen-containing washing machine tank cleaning tablets of Examples 1-4 were placed in a sealed air-permeable package and stored in a constant temperature and humidity chamber (40 °C / 75% RH) for 30 days, and compared with the active oxygen-containing washing machine tank cleaning tablets that had not undergone storage treatment, and the active oxygen retention rate was calculated;

[0114] Bactericidal rate: The active oxygen-containing washing machine tank cleaning tablets of Examples 1-4 were dissolved in water to prepare a cleaning tablet solution, the cleaning tablet solution was added dropwise to Escherichia coli and Staphylococcus aureus colonies, respectively, and after incubation in a constant temperature incubator at 35 ± 2 °C for 24-48 h, the number of colonies was counted and the bactericidal rate was calculated;

[0115] The results are shown in Table 2.

[0116] Table 2

[0117]

[0118]

[0119] As can be seen from Tables 1 and 2, the laundry machine tank cleaning tablet of the active oxygen of the embodiment of the application has a complete appearance, is mild and non-irritating, has a high active oxygen content, can quickly disintegrate in a short time, and has high active oxygen retention rate and sterilization rate, can clean dirt in the laundry machine tank and kill Escherichia coli, Staphylococcus aureus and the like in the laundry machine tank, has good cleaning effect, and can effectively sterilize.

[0120] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0121] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art, without departing from the spirit and scope of the present application, can make various changes and modifications, and therefore the protection scope of the present application should be defined by the scope defined by the claims.

Claims

1. A washing machine tub cleaning sheet containing active oxygen, characterized in that, include: The cleaning tablet body and at least a coating layer covering the surface of the cleaning tablet body portion. The coating layer comprises: hydroxypropyl methylcellulose, an antibacterial agent, and an antioxidant; The cleaning pad body includes: a main cleaning layer, a transition layer that covers at least a portion of the upper surface of the main cleaning layer, and a rapid disintegration layer that covers at least a portion of the upper surface of the transition layer; The main cleaning layer comprises: sodium percarbonate, sodium carbonate, surfactant, sodium citrate, microcrystalline cellulose, and polyethylene glycol; The transition layer comprises: anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine, enzyme preparation, the microcrystalline cellulose, and polyethylene glycol; The rapidly disintegrating layer comprises: anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine, and the enzyme preparation.

2. The washing machine tub cleaning sheet containing active oxygen according to claim 1, characterized in that, The thickness of the rapidly disintegrating layer is 2.0-3.0 mm; The thickness of the transition layer is 0.1-0.5 mm; The thickness of the main cleaning layer is 4.5-5.0 mm; The thickness of the coating layer is 60-100 μm.

3. The washing machine tub cleaning sheet containing active oxygen according to claim 1, characterized in that, In the transition layer, The contents of the anhydrous citric acid, the sodium bicarbonate, the tetraacetylethylenediamine, and the enzyme preparation gradually decrease from the rapid disintegration layer to the main cleaning layer.

4. The washing machine tub cleaning sheet containing active oxygen according to claim 1, characterized in that, The washing machine tub cleaning sheet comprises, by weight, the following components: sodium percarbonate: 35-45 parts, anhydrous citric acid: 15-20 parts, sodium carbonate: 10-20 parts, sodium bicarbonate: 15-20 parts, sodium citrate: 3-10 parts, polyethylene glycol: 2-5 parts, surfactant: 0.5-2 parts, microcrystalline cellulose: 3-14 parts, tetraacetylethylenediamine: 4-12 parts, enzyme preparation: 1-6 parts, hydroxypropyl methylcellulose: 0.5-2.5 parts, antibacterial agent: 0.01-1 part, and antioxidant: 0.1-0.3 parts.

5. A method for preparing a washing machine tub cleaning sheet containing active oxygen, used to prepare the washing machine tub cleaning sheet containing active oxygen as described in any one of claims 1-4, characterized in that, The preparation method includes the following steps: S100. After obtaining the main cleaning layer by first compression treatment using the main cleaning layer mixed powder, the transition layer mixed powder is covered on at least part of the upper surface of the main cleaning layer. Then, the rapid disintegration layer mixed powder is used to perform a second compression treatment on the transition layer mixed powder. Finally, the cleaning tablet body is obtained by drying. S200. Add antioxidants and antibacterial agents to an aqueous solution of hydroxypropyl methylcellulose and stir until uniform. Spray the solution onto the surface of the main body of the cleaning sheet and dry it to obtain the washing machine tub cleaning sheet containing active oxygen. The main cleaning layer mixed powder comprises: sodium percarbonate, sodium carbonate, surfactant, sodium citrate, microcrystalline cellulose, and polyethylene glycol; The transition layer mixed powder comprises: the microcrystalline cellulose, the polyethylene glycol, the tetraacetylethylenediamine, and the enzyme preparation; The rapidly disintegrating layer mixed powder includes anhydrous citric acid, sodium bicarbonate, tetraacetylethylenediamine, and the enzyme preparation.

6. The preparation method according to claim 5, characterized in that, The preparation method of the main cleaning layer mixed powder includes: S101. The sodium carbonate, sodium citrate, microcrystalline cellulose and surfactant are dried and then mixed evenly to obtain a mixed powder; S102. After heating the polyethylene glycol to a liquid state, add it to the mixed powder and perform a first stirring treatment and a cooling treatment in sequence to obtain a mixture; S103. Add the dried sodium percarbonate to the mixture and perform a second stirring process to obtain the main cleaning layer mixed powder.

7. The preparation method according to claim 6, characterized in that, In step S102, the polyethylene glycol is heated to 48-52°C; In step S102, the cooling process cools the temperature to below 25°C. In step S102, the particle size of the mixture is 0.2-0.5 mm; In step S103, the temperature of the second stirring process is below 30°C.

8. The preparation method according to claim 6, characterized in that, The enzyme preparation includes at least one or a combination of lipase and protease. The polyethylene glycol includes polyethylene glycol 8000.

9. The preparation method according to claim 5, characterized in that, In S100, The pressure for the first tableting process is 5-8 kN; The pressure for the second tableting process is 15-20 kN.

10. The application of a washing machine tub cleaning sheet containing active oxygen, characterized in that, The application of the washing machine tub cleaning tablet containing active oxygen as described in any one of claims 1-4 in cleaning the washing machine tub.

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