Bacteriostatic washing machine tank cleaning block composition and preparation method thereof

Abstract

The invention relates to a bacteriostatic washing machine tank cleaning block composition and a preparation method thereof, and the bacteriostatic washing machine tank cleaning block composition comprises the following components: peroxide salt, a surfactant, a chelating agent, an acid substance, modified silicon dioxide, an active oxygen activator, a release agent, an adhesive, a filler and water; wherein the modified silicon dioxide is obtained by firstly hydroxylating silicon dioxide, then carrying out esterification reaction with hexadecenoic acid and linolenic acid, and finally polymerizing with sodium acrylate. The modified silicon dioxide can generate mechanical friction with stubborn dirt to promote the dirt to fall off, a high-crosslinking-degree net-shaped organic chain segment formed on the surface of the modified silicon dioxide has amphipathicity, after the modified silicon dioxide is compounded with the surfactant and other components, a synergistic effect is generated to improve the decontamination effect, the compatibility of all the components can be improved, and the cleaning effect is improved. Falling stubborn dirt can be wrapped, and the decontamination effect is further improved; all the components are compounded, so that a good antibacterial effect and the like are achieved, and a good prospect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of washing machine cleaning products, in particular to an antibacterial washing machine tank cleaning block composition and a preparation method thereof. Background Art

[0002] Currently, there are many types of washing machine trough cleaners on the market, but all types of products have obvious limitations. When using liquid detergents, it is difficult for consumers to accurately control the amount used, and it is easy to pour too much or too little. Moreover, the liquid is unevenly distributed in the washing machine trough, making it difficult to fully cover every corner, resulting in poor cleaning effect. Although powdered detergents are relatively accurate in metering, there is a problem of incomplete dissolution. The residual powder will not only affect the normal operation of the washing machine and clog the drainage pipes, but may also leave marks on clothes. Existing block cleaning products, although they have solved the problems of metering and storage to a certain extent, are still unsatisfactory in terms of cleaning effect and antibacterial performance. Some block cleaners cannot effectively remove stubborn dirt, and are even powerless against dirt adhering to the gaps and corners of the washing machine trough.

[0003] From a chemical perspective, some washing machine trough cleaners contain highly corrosive or irritating ingredients, such as the strong acids and alkalis found in some traditional detergents. While cleaning, these ingredients can also corrode the metal and plastic components of the washing machine, shortening its lifespan. Long-term use of these cleaners can cause rust and perforation of metal parts within the washing machine, while plastic parts can become brittle and deform, affecting the machine's sealing performance and overall structural strength. Furthermore, these irritating ingredients pose safety risks during use. If they come into contact with skin or eyes, they can cause severe irritation and burns, posing a health risk to the user.

[0004] In summary, the main problems of washing machine tub cleaners currently on the market include: 1. Uneven distribution, resulting in reduced cleaning effect; 2. Inability to effectively remove stubborn dirt, and stubborn dirt easily falls back onto the surface of the washing machine tub after leaving the washing machine tub, resulting in poor cleaning effect.

[0005] In summary, it is necessary to develop a new technical solution to overcome the defects in the existing technology. Summary of the Invention

[0006] The present invention provides an antibacterial washing machine trough cleaning block composition and a preparation method thereof. The antibacterial washing machine trough cleaning block composition of the present invention comprises components such as a peroxide salt, a surfactant, a chelating agent, an acidic substance, and modified silica. The modified silica promotes uniform distribution of the components and improves cleaning effectiveness, thus having promising application prospects.

[0007] The object of the present invention is to provide an antibacterial washing machine tank cleaning block composition, wherein the antibacterial washing machine tank cleaning block composition comprises the following components in mass fractions:

[0008]

[0009] The modified silicon dioxide is obtained by first hydroxylating silicon dioxide, then undergoing esterification reaction with hexadecenoic acid and linolenic acid, and finally undergoing polymerization with sodium acrylate.

[0010] Furthermore, the surfactant is selected from one or more of anionic surfactants, nonionic surfactants, and zwitterionic surfactants.

[0011] The surfactants of the present invention play an important role in the cleaning block composition. Anionic surfactants have good detergency and foaming properties, can effectively reduce surface tension, and make it easier for dirt to detach from the surface of the washing machine tank; nonionic surfactants can enhance the emulsification and dispersion ability of oil stains, and have relatively less foam, which is more suitable for the operating environment of the washing machine; zwitterionic surfactants can maintain good surface activity under different pH conditions, and have the characteristics of mildness and low irritation. When combined with other surfactants, they can synergistically improve the cleaning effect and reduce irritation to the washing machine material and the human body. By rationally adjusting the ratio of different types of surfactants, it is possible to achieve efficient emulsification, dispersion and removal of various dirt in the washing machine tank, such as grease, protein, dust, etc.

[0012] Furthermore, the anionic surfactant is selected from one or more of sodium dodecylbenzene sulfonate, sodium α-olefin sulfonate, sodium alkyl sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate (AES), sodium secondary alkyl sulfonate (SAS), sodium fatty acid methyl ester sulfonate (MES), and sodium succinate sulfonate.

[0013] Furthermore, the nonionic surfactant is selected from one or more of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester, alkylphenol polyoxyethylene ether, polyoxyethylene sorbitan fatty acid ester (Tween series), and polyoxyethylene fatty acid amide.

[0014] Furthermore, the zwitterionic surfactant is selected from one or more of cocamidopropyl betaine, sodium lauryl amphoacetate, imidazoline type amphoteric surfactant, and potassium cocoampholyl glycinate.

[0015] Furthermore, the chelating agent is selected from one or more of disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, pentasodium diethylenetriaminepentaacetate, and sodium citrate.

[0016] The main function of the chelating agent in the cleaning block composition of the present invention is to complex with metal ions such as calcium and magnesium in water to prevent the formation of scale and the redeposition of dirt, effectively remove existing scale in the washing machine tub, and at the same time prevent the metal ions from combining with dirt during the washing process, thereby preventing the dirt from adhering to the surface of the washing machine tub again and keeping the washing machine tub clean.

[0017] Furthermore, the peroxide salt is selected from one or both of sodium percarbonate and sodium perborate.

[0018] The peroxide salt of the present invention is coated sodium percarbonate with a mass fraction greater than 85%. The coated sodium percarbonate is a new type of high-efficiency bleaching bactericidal agent with the characteristics of being odorless, non-toxic and non-polluting. The active oxygen generated by its decomposition in water enables it to exhibit strong decontamination and bactericidal capabilities.

[0019] Furthermore, the acid substance is selected from one or more of citric acid, malic acid, and tartaric acid.

[0020] The main function of the acidic substance in the cleaning block composition of the present invention is to adjust the pH value of the system, optimize the cleaning and antibacterial environment, and can also undergo complexation reactions with metal ions to assist the chelating agent in removing scale, further improving the cleaning effect. In addition, the appropriate acidic environment can enhance the activity of peroxide salts, promote the release of active oxygen, and improve the overall performance of the cleaning block.

[0021] Furthermore, the oxygen activator is selected from one or both of tetraacetylethylenediamine and sodium nonanoyloxybenzenesulfonate.

[0022] The active oxygen activator of the present invention can significantly enhance the active oxygen release efficiency of the peroxide salt, thereby improving the cleaning and antibacterial capabilities of the cleaning block composition. It can also react with the peroxide salt to prompt the peroxide salt to release active oxygen faster and more effectively, thereby more thoroughly decomposing organic dirt and more efficiently killing bacteria and mold. The synergistic effect of the active oxygen activator and the peroxide salt is an important guarantee for the excellent cleaning and antibacterial properties of the cleaning block composition of the present invention.

[0023] Furthermore, the release agent is selected from one or more of stearic acid, sodium stearate, calcium stearate, titanium dioxide, white carbon black, talc, magnesium stearate, mica powder, clay, and white clay.

[0024] The release agent of the present invention plays an important role in the preparation process of the cleaning block composition. During the compacting process of the cleaning block composition, the release agent can reduce the friction between the cleaning block composition and the mold, allowing the cleaning block composition to be smoothly released from the mold, ensuring the shape integrity and surface quality of the cleaning block composition. At the same time, the release agent has no adverse effects on other properties of the cleaning block composition, such as solubility and stability.

[0025] Furthermore, the binder is selected from one or more of PEG-4000, PEG-6000, PEG-8000, corn starch, potato starch, pregelatinized starch, hydroxypropyl cellulose (HPC), methyl cellulose (MC), ethyl cellulose (EC), sucrose, glucose, maltose, povidone (PVP), and sodium polyacrylate.

[0026] The binder of the present invention securely bonds the various components of the cleaning block composition, ensuring the integrity of the composition during storage and use. Different binders have varying bonding properties and characteristics, and can be selected based on actual needs. For example, powdered PEG-based binders offer excellent water solubility and stability, starch-based binders are widely available and relatively low-cost, cellulose-based binders offer good film-forming properties and bonding strength, carbohydrate-based binders offer some moisture retention, and polyvidone and sodium polyacrylate offer strong bonding capabilities. By rationally selecting and using a binder, the cleaning block composition can maintain excellent physical properties under various environmental conditions.

[0027] Furthermore, the filler is selected from one or more of sodium sulfate, sodium chloride, and sodium bicarbonate.

[0028] The fillers in the present invention primarily regulate density, hardness, and cost in cleaning blocks. Sodium sulfate and sodium chloride increase the density and hardness of the cleaning block composition, making it less prone to breakage during storage and use. Sodium bicarbonate not only regulates density and hardness but also participates in the cleaning reaction to a certain extent, producing carbon dioxide gas, which helps loosen and remove dirt. Furthermore, the fillers can reduce the production cost of the cleaning block, improving the product's market competitiveness.

[0029] Another object of the present invention is to provide a method for preparing the above-mentioned antibacterial washing machine tank cleaning block composition, the method for preparing the antibacterial washing machine tank cleaning block composition comprising the following steps:

[0030] S1, hydroxylating silicon dioxide to obtain hydroxylated silicon dioxide;

[0031] S2. Under an inert atmosphere, mixing the hydroxylated silica, hexadecenoic acid, linolenic acid, a catalyst, and a polymerization inhibitor, heating and stirring to react, to obtain an intermediate product;

[0032] S3, blending the intermediate product, sodium acrylate, and an initiator, heating and stirring to react, to obtain modified silica;

[0033] S4. Add filler and surfactant to the mixing equipment and stir evenly;

[0034] S5. Add the modified silica and the remaining components into a mixing device, blend them, stir them evenly, and press them into blocks to obtain the antibacterial washing machine tank cleaning block composition.

[0035] Furthermore, in step S2, the mass ratio of the hydroxylated silica, hexadecenoic acid, and linolenic acid is (1-2):(8-12):(1-2), and the temperature of the heating and stirring reaction is 70-90°C.

[0036] Furthermore, in step S3, the mass ratio of the intermediate product to sodium acrylate is (1-2):(3-5), and the temperature of the heating and stirring reaction is 60-80°C.

[0037] The present invention has the following beneficial effects:

[0038] The present invention provides an antibacterial washing machine tank cleaning block composition and a preparation method thereof. The components of the antibacterial washing machine tank cleaning block composition include peroxide salts, surfactants, chelating agents, acidic substances, modified silica, etc. The modified silica is obtained by first hydroxylating silica, then reacting with hexadecenoic acid and linolenic acid for esterification, and finally polymerizing with sodium acrylate. The modified silica can generate mechanical friction with stubborn dirt in the washing machine tank, reduce the adhesion of stubborn dirt to the washing machine tank, and promote the falling of stubborn dirt. In addition, hexadecenoic acid and linolenic acid are lipophilic, and sodium acrylate is lipophilic. It has hydrophilicity, and the three are grafted onto silica to make the modified silica amphiphilic. After being compounded with surfactants and other ingredients, it can produce a synergistic effect to improve the decontamination effect. Finally, after sodium acrylate is polymerized with hexadecenoic acid and linolenic acid, a highly cross-linked network of organic chain segments is formed on the surface of the modified silica. The network of organic chain segments not only improves the compatibility of the modified silica with the remaining components and promotes the uniform dispersion of the components, but also can wrap up the stubborn dirt that has fallen off, so that the stubborn dirt can be easily separated from the washing machine with the water flow, avoiding the stubborn dirt that has fallen off from being re-deposited on the surface of the washing machine tank, and further improving the decontamination effect.

[0039] This invention achieves synergistic benefits through the innovative combination of surfactants, chelating agents, and modified silica. The surfactants work together to rapidly remove dirt, while the chelating agent removes scale and prevents deposits. The peroxide salt, combined with the oxygen activator, powerfully decomposes dirt and inhibits bacteria. The modified silica further enhances this synergistic effect. The mild, non-corrosive formula protects washing machine components and extends their service life. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the technical solutions of the present invention, the following examples are given. Unless otherwise stated, the raw materials, reactions and post-processing methods mentioned in the examples are common raw materials on the market and technical methods well known to those skilled in the art.

[0041] The terms "preferred," "preferably," "more preferred," and the like, used herein, refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

[0042] It should be understood that, except in any operating examples, or where otherwise indicated, all numbers expressing, for example, quantities of ingredients used in the specification and claims are to be understood as being modified in all instances by the term "about." Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and appended claims are approximations that may vary depending upon the desired properties to be obtained by the present invention.

[0043] The examples of the present invention use the following raw materials:

[0044] Sodium dodecylbenzenesulfonate was purchased from Jiangsu Saike Chemical Co., Ltd.

[0045] C 12 -C 14 Secondary alcohol polyoxyethylene ether was a surfactant with the brand name SECOL-1209, purchased from Jiangsu Secco Chemical Co., Ltd.

[0046] Tetrasodium ethylenediaminetetraacetate (EDTA-4Na) was purchased from Nouryon Ltd. as a chelating agent.

[0047] Citric acid was purchased from Tengxiang Chemical Co., Ltd.

[0048] Silicon dioxide, with a particle size of 20–100 nm, was purchased from Wanhua Tianhe New Materials Co., Ltd.

[0049] Tetraacetylethylenediamine is an oxygen activator with the brand name TAED, which was purchased from Jinke Daily Chemical Company.

[0050] Sodium percarbonate is a peroxide salt with the brand name SPCC, purchased from Jinke Daily Chemical Company.

[0051] Talc powder was used as a release agent, 2000 mesh, purchased from Haiyang Powder Technology Co., Ltd.

[0052] PEG-6000 is an adhesive purchased from Liaoning Aoke Chemical Co., Ltd.

[0053] Sodium sulfate was used as a filler and was purchased from Qiming Chemical Technology Co., Ltd.

[0054] Sodium chloride was used as a filler and was purchased from Pengcai Fine Chemical Co., Ltd.

[0055] Sodium bicarbonate was used as a filler and was purchased from Qiming Chemical Technology Co., Ltd.

[0056] The catalyst was p-toluenesulfonic acid, purchased from Pengcai Fine Chemical Co., Ltd.

[0057] The polymerization inhibitor was p-methoxyphenol, which was purchased from Huaxi Chemical Co., Ltd.

[0058] The initiator was potassium persulfate, purchased from Sansong Technology Co., Ltd.

[0059] The components and their mass fractions of Examples 1-3 and Comparative Examples 1-2 of the present invention are shown in Table 1:

[0060] Table 1 Components and their mass fractions of Examples 1-3 and Comparative Examples 1-2

[0061]

[0062]

[0063] The preparation method of the antibacterial washing machine tank cleaning block composition of Examples 1-3 above comprises the following steps:

[0064] S1, immersing silica in a 30 wt% hydrogen peroxide solution, reacting at 105° C. for 6 h, filtering, washing, and drying to obtain hydroxylated silica;

[0065] S2. Under a nitrogen atmosphere, using toluene as a solvent, the hydroxylated silica, hexadecenoic acid, linolenic acid, a catalyst, and a polymerization inhibitor are blended in a mass ratio of 1:10:1:0.2:0.05, heated to 80° C., stirred for reaction for 10 h, filtered, washed, and dried to obtain an intermediate product;

[0066] S3, using 50 wt % ethanol as a solvent, blending the intermediate product, sodium acrylate, and an initiator in a mass ratio of 1:4:0.05, heating to 70° C. and stirring for reaction for 3 h, filtering, washing, and drying to obtain modified silica;

[0067] S4, according to the above mass fraction, add sodium sulfate, sodium chloride, sodium bicarbonate into the mixing equipment, and then add sodium dodecylbenzene sulfonate, C 12 -C 14 The secondary alcohol polyoxyethylene ether was atomized (atomization pressure 0.3 MPa) and sprayed into the mixing equipment, and stirred uniformly at 200 r / min;

[0068] S5. According to the above mass fractions, the modified silica and the remaining components are added to a mixing device for blending, stirred evenly at 400 r / min, and then formed into blocks using a briquetting machine to obtain the antibacterial washing machine tank cleaning block composition.

[0069] Comparative Example 1

[0070] The difference between Comparative Example 1 and Example 1 is that step S3 is deleted, the modified silica is replaced by the intermediate product, and the remaining components and preparation method are the same as those in Example 1.

[0071] Comparative Example 2

[0072] The difference between Comparative Example 2 and Example 1 is that steps S2 and S3 are deleted, and modified silica is replaced by hydroxylated silica. The remaining components and preparation method are the same as those in Example 1.

[0073] Test Example 1

[0074] The stability test was performed on the antibacterial washing machine tank cleaning block compositions of Examples 1-3 and Comparative Examples 1-2.

[0075] Test method:

[0076] Under laboratory conditions, the antibacterial washing machine tank cleaning block compositions of Examples 1-3 and Comparative Examples 1-2 were subjected to a series of tests, including 8 weeks of high temperature (45±1°C), 8 weeks of room temperature (25±2°C), 8 weeks of low temperature (0±2°C), and 8 weeks of high temperature and high humidity (37±1°C / 75% RH). The stability of the products was evaluated by changes in appearance, fluffiness, and moisture absorption and precipitation. If there was no significant change in appearance, no obvious fluffiness or brittleness, and no obvious moisture absorption and precipitation, the product was considered to have acceptable stability.

[0077] The test results are shown in Table 2.

[0078] Table 2 Stability test results

[0079]

[0080] As can be seen from Table 2, the stability of Examples 1-3 and Comparative Example 1 are all qualified, and only Comparative Example 2 is unqualified. This is because Comparative Example 2 replaces the modified silica with hydroxylated silica, and does not introduce hexadecenoic acid, linolenic acid, and sodium acrylate, so that the hydroxylated silica does not have amphiphilicity and a network of organic chains, resulting in a decrease in the compatibility of the hydroxylated silica with the remaining components and an inability to be evenly dispersed, resulting in reduced product stability.

[0081] Test Example 2

[0082] The cleaning power test was performed on the antibacterial washing machine tank cleaning block compositions of Examples 1-3 and Comparative Examples 1-2.

[0083] Test method:

[0084] (1) Preparation

[0085] Preparation of test pieces simulating contamination of washing machine troughs: Stainless steel sheets with a material similar to that of washing machine troughs were selected as test pieces with specifications of 50mm×25mm×3mm. According to the specific formula of the stain composition, stains simulating the washing machine trough were prepared. The ingredients of the stain composition include 40% red clay (particle size ≤5mm), 0.5% magnesium stearate (particle size ≤270μm), 0.3% dirty cloth scraps (JB-03 sebum-stained cloth, length and width are both ≤2mm), 0.3% paper towel scraps (100% virgin wood pulp paper towel, length and width are both ≤2mm), 0.1% artificial sweat, and the balance is deionized water. The stain was evenly applied to the surface of the test piece, with the application amount controlled at 2-2.3g, and then placed in a 45°C oven for aging for 2 hours to simulate the state of dirt adhesion and solidification in the washing machine trough after long-term use.

[0086] Test Equipment and Cleaning Solution Preparation: A small agitated cleaning device was used to simulate a washing machine wash cycle. The cleaning solution was prepared by adding 3% by weight of the corresponding antibacterial washing machine tumble cleaner block composition to 250 ppm hard water (containing 0.165 g / L anhydrous calcium chloride and 0.247 g / L magnesium sulfate).

[0087] (2) Testing

[0088] The prepared simulated contaminated washing machine tank test pieces were divided into groups, with 3 test pieces in each group, corresponding to Examples 1-3 and Comparative Examples 1-2, respectively.

[0089] Place the test piece in the cleaning tank of a small agitated cleaning device and pour in the prepared cleaning test solution, ensuring that the test piece is completely immersed. Set the cleaning temperature to 40°C, the agitation speed to 150 rpm, and the cleaning time to 20 minutes.

[0090] After cleaning, take out the test piece and soak it in distilled water for 30 seconds to remove the residual cleaning liquid on the surface. Then put the test piece into a constant temperature drying oven at 45°C and dry it for 1 hour. After cooling to room temperature, use an electronic balance with an accuracy of 0.001g to weigh the mass of the test piece.

[0091] Calculate cleaning power (dirt removal rate) using the formula: Cleaning power = (m1 - m2) / (m1 - m0) × 100%, where m0 is the initial mass of the test piece, m1 is the mass of the test piece after staining and aging, and m2 is the mass of the test piece after cleaning and drying. The cleaning power of each test piece is the average of the test results of three test pieces.

[0092] The test results are shown in Table 3.

[0093] Table 3 Cleaning power test results

[0094]

[0095]

[0096] As can be seen from Table 3, the results of Example 1-3 are significantly better than those of Comparative Example 1-2. In Example 1-3, sodium dodecylbenzenesulfonate and C 12 -C 14 Surfactants such as secondary alcohol polyoxyethylene ethers work synergistically with tetrasodium ethylenediaminetetraacetic acid to remove scale, while sodium percarbonate, under the action of citric acid and tetraacetylethylenediamine, strongly decomposes organic dirt, resulting in excellent cleaning results. The silica in Comparative Example 1 lacks sodium acrylate, making it lack amphiphilicity and containing no reticular organic segments. This results in the silica being unable to synergize with the surfactants and reducing its ability to encapsulate dirt, leading to a reduction in cleaning effectiveness. The silica in Comparative Example 2 lacks hexadecenoic acid, linolenic acid, and sodium acrylate, making it lack amphiphilicity and reticular organic segments. This not only prevents it from synergizing with the surfactants and encapsulating dirt, but also reduces its compatibility with the other components, further reducing its cleaning effectiveness.

[0097] Test Example 3

[0098] The antibacterial effect test was performed on the antibacterial washing machine tank cleaning block compositions of Examples 1-3 and Comparative Examples 1-2.

[0099] Test method:

[0100] The antibacterial effect of the antibacterial washing machine tank cleaning block composition was tested according to QB / T 2738-2012 "Evaluation method for the antibacterial and antimicrobial effects of daily chemical products".

[0101] The test results are shown in Table 4.

[0102] Table 4 Antibacterial effect test results

[0103] Test subjects Escherichia coli inhibition rate (%) Staphylococcus aureus inhibition rate (%) Example 1 99.5 99.2 Example 2 99.0 98.7 Example 3 98.5 98.0 Comparative Example 1 96.3 96.0 Comparative Example 2 87.0 85.0

[0104] As can be seen from Table 4, Examples 1-3 have a higher antibacterial rate. This is because the peroxide salt releases a large amount of active oxygen under the action of the active oxygen activator, which can effectively kill bacteria. The surfactant may destroy the bacterial cell membrane, enhancing the antibacterial effect, and the modified silica and the surfactant produce a synergistic effect, further enhancing the antibacterial effect. Components such as chelating agents may also synergistically inhibit bacterial growth. The antibacterial effect of Comparative Example 1 is close to that of Examples 1-3. This is because the silica in Comparative Example 1 introduces hexadecenoic acid and linolenic acid, which enhances the compatibility of silica with the remaining components, facilitates the uniform dispersion of the components, and avoids a decrease in the antibacterial effect. The effect of Comparative Example 2 is significantly worse. This is because the silica in Comparative Example 2 does not introduce hexadecenoic acid, linolenic acid, or sodium acrylate, which reduces the compatibility of silica with the remaining components, making the components easily aggregated, thereby reducing the antibacterial effect.

[0105] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0106] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An antibacterial washing machine tank cleaning block composition, characterized in that: The antibacterial washing machine tank cleaning block composition comprises the following components by mass fraction: The modified silicon dioxide is obtained by first hydroxylating silicon dioxide, then undergoing esterification reaction with hexadecenoic acid and linolenic acid, and finally undergoing polymerization with sodium acrylate.

2. The antibacterial washing machine tank cleaning block composition according to claim 1, characterized in that: The surfactant is selected from one or more of anionic surfactants, nonionic surfactants and zwitterionic surfactants.

3. The antibacterial washing machine tank cleaning block composition according to claim 1, characterized in that: The chelating agent is selected from one or more of disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, pentasodium diethylenetriaminepentaacetate, and sodium citrate.

4. The antibacterial washing machine tank cleaning block composition according to claim 1, characterized in that: The peroxide salt is selected from one or both of sodium percarbonate and sodium perborate.

5. The antibacterial washing machine tank cleaning block composition according to claim 1, characterized in that: The acid substance is selected from one or more of citric acid, malic acid and tartaric acid.

6. The antibacterial washing machine tank cleaning block composition according to claim 1, characterized in that: The active oxygen activator is selected from one or two of tetraacetylethylenediamine and sodium nonanoyloxybenzenesulfonate.

7. The method for preparing the antibacterial washing machine tank cleaning block composition according to any one of claims 1 to 6, characterized in that: The preparation method of the antibacterial washing machine tank cleaning block composition comprises the following steps: S1, hydroxylating silicon dioxide to obtain hydroxylated silicon dioxide; S2. Under an inert atmosphere, mixing the hydroxylated silica, hexadecenoic acid, linolenic acid, a catalyst, and a polymerization inhibitor, heating and stirring to react, to obtain an intermediate product; S3, blending the intermediate product, sodium acrylate, and an initiator, heating and stirring to react, to obtain modified silica; S4. Add filler and surfactant to the mixing equipment and stir evenly; S5. Add the modified silica and the remaining components into a mixing device, blend them, stir them evenly, and press them into blocks to obtain the antibacterial washing machine tank cleaning block composition.

8. The method for preparing the antibacterial washing machine tank cleaning block composition according to claim 7, characterized in that: In step S2, the mass ratio of the hydroxylated silica, hexadecenoic acid, and linolenic acid is (1-2):(8-12):(1-2), and the temperature of the heating and stirring reaction is 70-90°C.

9. The method for preparing the antibacterial washing machine tank cleaning block composition according to claim 7, characterized in that: In step S3, the mass ratio of the intermediate product to sodium acrylate is (1-2):(3-5), and the temperature for heating and stirring the reaction is 60-80°C.

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