Softening, antistatic, and stain-removing washing sheet and preparation method therefor

Abstract

A softening, antistatic, and stain-removing washing sheet and a preparation method therefor. The softening, antistatic, and stain-removing washing sheet comprises: a film-forming agent, an anionic surfactant, a nonionic surfactant, a softener, a conditioner, a filler, a chelating agent, an essence, and water. Said washing sheet has softening, antistatic, and stain-removing characteristics, is less corrosive to equipment, and is suitable for large-scale mass production.

Description

A softening, antistatic, stain-removing detergent sheet and its preparation method Technical Field

[0001] This application relates to the field of detergent products, and more specifically, it relates to a softening, antistatic, and stain-removing detergent sheet and a method for preparing the same. Background Technology

[0002] During repeated washing of fabrics, the alkaline components in detergents and the cleaning effect often damage the inherent smoothness, extensibility, and elasticity of the fibers, causing the fabric to appear wrinkled, feel stiff, and easily generate static electricity in dry climates. To solve these problems, fabric softeners are widely used in fabric care.

[0003] Quaternary ammonium cationic surfactants and silicone-based fabric softeners are common fabric softeners. However, silicone softeners, such as polydimethylsiloxane, are not easily degraded in the natural environment and may have adverse effects on the ecosystem. Modified silicone softeners, such as amino silicone oil, are easily decomposed at high temperatures, which not only affects the product's performance but may also exacerbate environmental pollution. Furthermore, to achieve better softening results, excessive amounts of fabric softener are often added to laundry products, and excessive residual fabric softener may cause irritation or allergic reactions to human skin.

[0004] Patent CN114517413A discloses a fully soluble fabric softener sheet, which solves the problem of insufficient material loading in non-woven fabric softener sheets, but it does not have a stain removal function.

[0005] Based on the above, some laundry products on the market have emerged that combine softening and stain removal, such as the softening laundry detergents and laundry compositions disclosed in patents CN108624417A and CN117363432A. While these achieve the dual purpose of softening and stain removal, the use of a large amount of strong cationic surfactants as softeners results in a rough surface on fabrics after washing. Furthermore, during the production process, strong cationic surfactants may damage the oxide film on the surface of production equipment, affecting its corrosion resistance.

[0006] Therefore, there is a need to develop a laundry product that not only softens and removes stains, but is also environmentally friendly, healthy, and easy to use. Summary of the Invention

[0007] To address the aforementioned problems, this application provides a softening, antistatic, and stain-removing detergent sheet and its preparation method. The softening, antistatic, and stain-removing detergent sheet provided by this application possesses softening, antistatic, and stain-removing properties, exhibits low corrosiveness to equipment, and is suitable for large-scale mass production.

[0008] In a first aspect, this application provides a softening and antistatic detergent sheet, employing the following technical solution: A softening and antistatic detergent sheet, wherein the raw materials for preparing the softening and antistatic detergent sheet comprise the following components by weight percentage: 6-35% film-forming agent, 5-20% anionic surfactant, 1-10% nonionic surfactant, 1-15% softener, 0-10% conditioning agent, 3-20% filler, 0.2-5% chelating agent, 0.5-2% fragrance, and water; the film-forming agent is polyvinyl alcohol or a combination of polyvinyl alcohol and polyvinylpyrrolidone; the anionic surfactant... The agent includes at least one of sodium alkyl hydroxyethyl sulfonate, sodium oleoyl ethoxysulfonate, and sodium fatty alcohol polyoxyethylene ether sulfate; the nonionic surfactant includes at least two of fatty amine polyglycerol ether, oleoyl ethoxy compound, fatty acid glyceride, sucrose fatty acid ester, methyl glucotrioleate, glyceryl laurate, and fatty acid methyl ester ethoxy compound; the softener includes at least one of sodium methyl lauroyl taurate, sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, sodium cocoyl sarcosinate, sodium lauroyl alanine, sodium cocoyl alanine, sodium lauroyl glycinate, and sodium cocoyl glycinate.

[0009] In complex mixtures of anionic and cationic surfactants, the strong electrostatic attraction between positive and negative ions in molecules easily leads to the formation of rod-shaped micelles after compounding. When the concentration exceeds the critical micelle concentration, aggregation occurs, resulting in turbidity and phase separation, which adversely affects the performance of detergent sheets. This application uses specific types of anionic surfactants, nonionic surfactants, and fabric softeners in synergistic combinations to form a special system to avoid the above problems.

[0010] The selected fabric softener is a weak cationic surfactant, such as sodium alkyl hydroxyethyl sulfonate, sodium ethoxysulfonate of oils and fats, and sodium polyoxyethylene ether sulfate of fatty alcohols. These contain hydrophilic ethoxy groups, which can interact with the hydrophilic part of the cationic surfactant molecule to form a stable mixture in water, avoiding precipitation in the solution. They have excellent compatibility and synergistic washing effect with cationic surfactants, thus achieving both high-efficiency softening and stain removal.

[0011] The nonionic surfactant selected in this application has a different structure from polyoxyethylene ether type nonionic surfactants, which are mainly composed of ether bonds. For example, the hydrophilic group of fatty amine polyglycerol ether is composed of hydroxyl groups and ether bonds. The hydroxyl groups and ether bonds appear alternately, and its hydrophilicity is significantly stronger than that of polyoxyethylene ether type surfactants. It has certain softening and antistatic properties for fabrics.

[0012] Furthermore, the selected fabric softener has excellent emulsifying, wetting, solubilizing, dispersing, and foaming properties. It is relatively stable to acids, heat, and alkalis, and can maintain its performance under different environmental conditions. It is also mild, low-irritant, and environmentally friendly.

[0013] Preferably, the raw materials for preparing the softening, antistatic, and stain-removing detergent sheet include the following components by weight percentage: 12.5-20% film-forming agent, 15-20% anionic surfactant, 4-7% nonionic surfactant, 5-10% softener, 1-3% conditioning agent, 3-10% filler, 1.5-3% chelating agent, 0.5-2% fragrance, and water.

[0014] Preferably, the film-forming agent is a mixture of polyvinyl alcohol and polyvinylpyrrolidone, and the mass ratio of polyvinyl alcohol to polyvinylpyrrolidone is 3-25:1.

[0015] Preferably, the film-forming agent is a mixture of polyvinyl alcohol and polyvinylpyrrolidone, and the mass ratio of polyvinyl alcohol to polyvinylpyrrolidone is 3-15:1.

[0016] By adopting the above technical solution and selecting specific film-forming agents, and applying them to a special system composed of specific types of anionic surfactants, nonionic surfactants, and softeners, the quality of the detergent sheets is improved, the moisture resistance and high temperature resistance of the detergent sheets are enhanced, and the softening, antistatic, and detergency functions of the detergent sheets can be more fully utilized.

[0017] Preferably, the anionic surfactant is sodium alkyl hydroxyethyl sulfonate, the nonionic surfactant is a mixture of fatty amine polyglycerol ether and fatty acid methyl ester ethoxylate, and the softener is sodium methyl lauroyl taurate.

[0018] Preferably, in the raw materials for preparing the softening, antistatic, and stain-removing detergent sheet, the weight percentage of sodium alkyl hydroxyethyl sulfonate is 12-18%, the weight percentage of fatty amine polyglycerol ether is 3-8%, the weight percentage of fatty acid methyl ester ethoxylate compound is 1-3%, and the weight percentage of sodium methyl lauroyl taurate is 5-8%.

[0019] By adopting the above technical solution, the types of anionic surfactants, nonionic surfactants, and fabric softeners are further limited, so that the special system can achieve a better synergistic state and give full play to the softening, antistatic, and detergency effects of the detergent sheets.

[0020] Preferably, the conditioning agent includes at least one of alkyl dimethyl polyoxyethylene ammonium chloride, monoalkyl dimethyl hydroxyethyl ammonium chloride, and chloro-2-hydroxy-3-(trimethylamino)propyl polyoxyethylene cellulose ether.

[0021] Preferably, the filler is plant starch.

[0022] Preferably, the plant starch includes at least one of corn starch, pea starch, and tapioca starch.

[0023] Preferably, the chelating agent includes at least one of sodium polyaspartate, citric acid and its salts, and gluconic acid and its salts.

[0024] Secondly, this application provides a method for preparing a soft, antistatic, and stain-removing detergent sheet, employing the following technical solution: A method for preparing a soft, antistatic, and stain-removing detergent sheet includes the following steps: Step 1: Dispersing a chelating agent with water to obtain a chelating agent dispersion; dispersing a filler with water to obtain a filler dispersion; Step 2: Mixing a film-forming agent with water at 80-90°C until the material swells and dissolves completely; Step 3: Adding an anionic surfactant to the material from Step 2, and waiting until it is completely dissolved without any lumps. Add nonionic surfactant and dissolve completely; Step 4: Mix the filler dispersion with the material from Step 3; Step 5: Mix the chelating agent dispersion with the material from Step 4; Step 6: Add fabric softener to the material from Step 5 and stir continuously until completely dissolved and free of lumps; Step 7: After the material from Step 6 has cooled to 45-55℃, add the remaining raw materials and stir evenly to obtain a slurry; Step 8: Dry the slurry from Step 7 at 80-120℃, shape it into sheets, and obtain a soft, antistatic, stain-removing detergent sheet.

[0025] By adopting the above technical solution, various raw materials are mixed in a specific order at corresponding temperatures, so that the various raw materials react more fully and the performance of the detergent tablets is better utilized.

[0026] In summary, this application has the following beneficial effects: 1. This application uses specific anionic surfactants, nonionic surfactants, and softeners to form a new and special system, which avoids the problems of complex mixed systems of anionic and cationic surfactants. It can effectively form tablets, and the active ingredients will not decompose at high temperatures during the tableting process, ensuring efficient detergency and softening effects, and adding antistatic effect.

[0027] 2. The special system of this application does not use strong cationic surfactants, thus avoiding damage to the dense oxide film on the surface of the production equipment, not affecting the corrosion resistance of the production equipment, and making the equipment have a longer service life.

[0028] 3. The special system of this application replaces the traditional technical solution of using quaternary ammonium salt cationic surfactants and organosilicon softeners, which is more beneficial to the ecosystem and environmental protection, and is less likely to cause irritation or allergic reactions to human skin. Attached Figure Description

[0029] Figure 1 shows the state of the washing sheets of Example 1, Comparative Example 4, Comparative Example 5, and Comparative Example 7 after a 24-hour high-temperature resistance test.

[0030] Figure 2 shows the corrosion of the metal surface of the tablet-making equipment by the washing tablets in Comparative Example 1. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] The raw materials used in the following examples and comparative examples are all commercially available products. Examples

[0033] Example 1: A softening, antistatic, and stain-removing detergent sheet, prepared from the following raw materials in weight percentages: 15% polyvinyl alcohol, 5% polyvinylpyrrolidone, 10% corn starch, 16% sodium lauryl hydroxyethyl sulfonate, 5% fatty acid methyl ester ethoxylate, 2% fatty amine polyglycerol ether, 6% sodium methyl lauroyl taurate, 1.2% chloro-2-hydroxy-3-(trimethylamino)propyl polyoxyethylene cellulose ether, 0.5% alkyl dimethyl polyoxyethylene ammonium chloride, 0.3% citric acid, 1.5% sodium citrate, 0.5% fragrance, and the balance being deionized water.

[0034] The alkyl dimethyl polyoxyethylene ammonium chloride was purchased from Guangzhou Yingnuo Chemical Technology Co., Ltd., model HEX25.

[0035] Fatty amine polyglycerol ether was prepared as follows: Solid fatty amine (tetradecylamine, purchased from Wuhan Huaxiang Kejie Biotechnology Co., Ltd., 96%) was added to a dry multi-necked flask and melted at 100°C until it reached a liquid state. Then, glycidyl ether (purchased from Guangdong Yuanfeng Chemical Co., Ltd.) was added dropwise at a rate of 1 mL / min with stirring. The molar ratio of tetradecylamine to glycidyl ether was 1:6. After maintaining the reaction temperature for 12 hours, a solid base catalyst (molar ratio of tetradecylamine to solid base was 10:1) was slowly added. The reaction temperature was then adjusted to 120°C, and the reaction was carried out for 2 hours. After cooling to room temperature, fatty amine polyglycerol ether was obtained.

[0036] The solid base catalyst can be potassium carbonate or sodium carbonate; in this embodiment, potassium carbonate is used.

[0037] This embodiment also provides a method for preparing a soft, antistatic, and stain-removing detergent sheet, including the following steps: Step 1: The filler and deionized water are mixed in an equal mass ratio to obtain a filler dispersion, which is then set aside.

[0038] The chelating agent and deionized water were mixed at a mass ratio of 1:3 to obtain a chelating agent dispersion, which was then set aside.

[0039] Step 2: Mix the film-forming agent with deionized water (the mass ratio of film-forming agent to deionized water is 1:8), heat to 85°C, and stir at a constant temperature for 45 minutes until the material swells and dissolves completely.

[0040] Step 3: Add anionic surfactant to the material from Step 2 while stirring. Once it is completely dissolved and free of lumps, add nonionic surfactant while stirring and dissolve fully.

[0041] Step 4: Add the filler dispersion to the material from Step 3 while stirring.

[0042] Step 5: Add the chelating agent dispersion to the material from Step 4 while stirring.

[0043] Step 6: Add fabric softener to the material from Step 5 while stirring. Continue stirring until it is completely dissolved and there are no lumps.

[0044] Step 7: Cool down to 50°C, add conditioning agent, flavoring and the remaining water to the material from Step 6 and continue to stir until evenly mixed to obtain a slurry.

[0045] Step 8: Dry the slurry at 100℃, shape it into sheets, slice it into different sizes, and pack it into boxes to obtain the finished product.

[0046] Example 2 is a softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that the composition and dosage of the raw materials are different. Specifically, it includes: 10% polyvinyl alcohol, 2.5% polyvinylpyrrolidone, 8% pea starch, 18% sodium ethoxysulfonate, 5% sodium lauroyl sarcosinate, 4% methyl glucotrioleate, 1% fatty amine polyglycerol ether, 1.2% chlorinated 2-hydroxy-3-(trimethylamino)propyl polyethylene oxide cellulose ether, 0.3% gluconic acid, 2% sodium gluconate, 0.5% fragrance, and the balance being deionized water.

[0047] Sodium ethoxysulfonate for oils was purchased from the China Daily Chemical Research Institute, model SNS-80.

[0048] A method for preparing a soft, antistatic, and stain-removing detergent sheet differs from Example 1 in that, in step 2, the film-forming agent is mixed with deionized water (the mass ratio of film-forming agent to deionized water is 1:5), heated to 80°C, and stirred at a constant temperature for 45 minutes until the material swells and dissolves completely.

[0049] In step 7, the temperature is cooled down to 45°C.

[0050] In step 8, the slurry is dried at 80°C.

[0051] Example 3 is a softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that the composition and dosage of the raw materials are different. Specifically, it includes: 15% polyvinyl alcohol, 5% polyvinylpyrrolidone, 10% tapioca starch, 16% sodium cocoyl hydroxyethyl sulfonate, 3% glyceryl laurate, 3% sodium methyl cocoyl taurate, 3% sodium lauroyl alanine, 1% fatty amine polyglycerol ether, 1.2% chlorinated 2-hydroxy-3-(trimethylamino)propyl polyethylene oxide cellulose ether, 0.3% citric acid, 2.5% sodium polyaspartate, 0.5% fragrance, and the balance being deionized water.

[0052] A method for preparing a soft, antistatic, and stain-removing detergent sheet differs from Example 1 in that, in step 2, the film-forming agent is mixed with deionized water (the mass ratio of film-forming agent to deionized water is 1:10), heated to 90°C, and stirred at a constant temperature for 45 minutes until the material swells and dissolves completely.

[0053] In step 7, the temperature is cooled down to 55°C.

[0054] In step 8, the slurry is dried at 120°C.

[0055] Example 4 is a softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that the composition and dosage of the raw materials are different. Specifically, it includes: 15% polyvinyl alcohol, 1% polyvinylpyrrolidone, 3% corn starch, 9% sodium ethoxysulfonate, 9% sodium cocoyl hydroxyethyl sulfonate, 2% fatty acid methyl ester ethoxylate, 1% sucrose fatty acid ester, 10% sodium lauroyl glycinate, 1% fatty amine polyglycerol ether, 1.2% chloro-2-hydroxy-3-(trimethylamino)propyl polyoxyethylene cellulose ether, 0.5% monoalkyl dimethyl hydroxyethyl ammonium chloride, 0.3% citric acid, 2% sodium gluconate, 0.5% fragrance, and the balance being deionized water.

[0056] Example 5 is a softening and antistatic stain-removing detergent sheet, which differs from Example 1 in that the amount of chlorinated 2-hydroxy-3-(trimethylamino)propyl polyethylene oxide cellulose ether and alkyl dimethyl polyoxyethylene ammonium chloride added is 0; deionized water is used to replenish the original amount.

[0057] Example 6 is a softening and antistatic stain-removing detergent sheet, which differs from Example 5 in that the amount of sodium methyl lauroyl taurate added is 10%, and the amount of deionized water is adjusted accordingly to make the total amount added 100%.

[0058] Example 7: A softening, antistatic, and stain-removing detergent sheet, differing from Example 1 in that the raw materials used in its preparation are as follows: 15% polyvinyl alcohol, 5% corn starch, 16% sodium lauryl hydroxyethyl sulfonate, 5% fatty acid methyl ester ethoxylate, 1% fatty amine polyglycerol ether, 6% sodium methyl lauroyl taurate, 1.2% chloro-2-hydroxy-3-(trimethylamino)propyl polyoxyethylene cellulose ether, 0.5% alkyl dimethyl polyoxyethylene ammonium chloride, 0.3% citric acid, 1.5% sodium citrate, 0.5% fragrance, and the balance being deionized water.

[0059] Table 1 Comparative Example 1: A softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that it uses an equal amount of di-fatty alkyl ethyl hydroxyethyl methyl sulfate ammonium in place of sodium methyl lauroyl taurate.

[0060] Comparative Example 2 is a softening and antistatic stain-removing detergent sheet, which differs from Example 1 in that an equal amount of aminopolydimethylsiloxane is used to replace sodium methyl lauroyl taurate.

[0061] Comparative Example 3 is a softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that it uses polyvinyl alcohol in an equal amount instead of sodium methyl lauroyl taurate.

[0062] Comparative Example 4 is a softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that it uses an equal amount of fatty alcohol polyoxyethylene ether to replace the fatty acid methyl ester ethoxy compound.

[0063] Comparative Example 5 is a softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that it uses an equal amount of alkyl glycoside instead of fatty acid methyl ester ethoxylate.

[0064] Comparative Example 6 is a softening and antistatic stain-removing detergent sheet, which differs from Example 1 in that sodium dodecyl sulfate is used in an equal amount to replace sodium lauryl hydroxyethyl sulfonate.

[0065] Comparative Example 7 is a softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that the raw materials used in its preparation are as follows: 20% polyvinyl alcohol (film-forming agent), 15% sodium α-olefin sulfonate (anionic surfactant), 29% sodium dodecyl sulfate (anionic surfactant), 5% fatty alcohol polyoxyethylene ether (nonionic surfactant), 4% alkyl glycoside (nonionic surfactant), 10% cocamidopropyl betaine (amphotericidal surfactant), 10% alkyl dihydroxyethyl methyl ammonium chloride (softener), 0.1% sodium citrate (chelating agent), 1% fragrance, and the remainder deionized water.

[0066] A method for preparing a soft, antistatic, and stain-removing detergent sheet includes the following steps: Step 1: A chelating agent and deionized water are mixed at a mass ratio of 1:3 to obtain a chelating agent dispersion for later use.

[0067] Step 2: Mix the film-forming agent with deionized water (the mass ratio of film-forming agent to deionized water is 1:8), heat to 85°C, and stir at a constant temperature for 45 minutes until the material swells and dissolves completely.

[0068] Step 3: Add anionic surfactant to the material from Step 2 while stirring. Once it is completely dissolved and free of lumps, add nonionic surfactant and amphoteric surfactant while stirring, and dissolve them completely.

[0069] Step 4: Add the chelating agent dispersion to the material from Step 3 while stirring.

[0070] Step 5: Add fabric softener to the material from Step 4 while stirring. Continue stirring until it is completely dissolved and there are no lumps.

[0071] Step 6: Cool down to 50°C, add flavoring and the remaining water to the material from Step 6 and continue stirring until a slurry is obtained.

[0072] Step 7: Dry the slurry at 100℃, shape it into sheets, slice it into different sizes, and pack it into boxes to obtain the finished product.

[0073] Comparative Example 8 is a softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that the raw materials used in its preparation are as follows: 16% polyvinyl alcohol (film-forming agent), 18% sodium dodecyl sulfate (anionic surfactant), 8% fatty alcohol polyoxyethylene ether (nonionic surfactant), 5% di-fatty alkyl ethyl hydroxyethyl methyl sulfate ammonium (softener), 5% amino polydimethylsiloxane (softener), 10% corn starch (filler), 8% zeolite (filler), 18% bentonite (filler), 2% sodium citrate, 0.2% fragrance, and the remainder being deionized water.

[0074] Comparative Example 9 is a softening, antistatic, and stain-removing detergent sheet, which differs from Example 1 in that the raw materials used in its preparation are as follows: 6% polyvinylpyrrolidone (film-forming agent), 5% sodium lauryl hydroxyethyl sulfonate (anionic surfactant), 6% sodium lauroyl sarcosinate (softener), 2% fatty acid methyl ester ethoxylate (nonionic surfactant), 15% corn starch, 1% amino polydimethylsiloxane (softener), 0.3% citric acid, 1.5% sodium citrate, 0.5% fragrance, and the remainder being deionized water.

[0075] Comparative Example 10 is a softening, antistatic, and stain-removing detergent sheet, which differs from Comparative Example 7 in that it uses sodium lauroyl alanine in an equal amount to replace alkyl dihydroxyethyl methyl ammonium chloride.

[0076] Comparative Example 11 is a softening and antistatic stain-removing detergent sheet, which differs from Comparative Example 8 in that it uses sodium lauroyl alanine in an equal amount to replace di-fatty alkyl ethyl hydroxyethyl methyl sulfate ammonium and amino polydimethylsiloxane.

[0077] Performance testing test 1. Viscosity test: According to GB / T 5561—2012 "Method for rotational viscosity and flow properties of surfactants", the viscosity of the slurry was measured at 60±0.5℃, 4# needle, and 6 rotation speed. The results are recorded in Table 2.

[0078] Table 2 The detergent sheets in Examples 1-7 use a specific combination system and are less affected by amino acid surfactants (fabricants).

[0079] Comparative Example 1 and Comparative Example 2 are washing tablets prepared by replacing the softener in Example 1 with a common softener in equal amounts. According to the results shown in Table 1, the specific combination system of the present application can also tolerate strong cationic softeners, but strong cationic softeners will increase the viscosity of the slurry. Comparative Example 3 is without any softener component, and there is little difference in the slurry viscosity compared with that of Example 1, indicating that the specific combination system of the present application is compatible with amino acid-based surfactants (softeners). For other combination systems of Comparative Example 10 and Comparative Example 11, the addition of amino acid surfactants will reduce the viscosity of the slurry, and if the viscosity is too low, it will be impossible to dry and make tablets. Replacing the corresponding components in Example 1 with other anionic and non-ionic surfactants in equal amounts gives Comparative Examples 4-6. It can be found that Comparative Examples 4-5 have relatively high viscosities and can be successfully made into tablets, but the quality of the washing tablets is poor, the tablets are brittle, and it is easy to produce debris and fragments during the slicing process.

[0080] 2. Wet stability test: According to QB / T5779-2023 "Laundry Tablets", a box of washing tablets (the washing tablets are stacked on top of each other inside) is placed in a test environment with a temperature of (25±2)°C and a relative humidity of (85±5)%, with 4 groups repeated. After 24 hours, one group is taken out respectively, and then the two washing tablets are separated to observe whether there is adhesion between the tablets, and the results are recorded in Table 3.

[0081] 3. High-temperature resistance test: The washing tablets are placed in a test environment with a temperature of (55±2)°C for 24 hours, and the washing tablets are bent and folded in half to observe whether there are creases or cracks. The results are recorded in Table 3.

[0082] The states of the washing tablets of Example 1, Comparative Example 4, Comparative Example 5, and Comparative Example 7 after 24 hours of high-temperature resistance test are shown in Figure 1.

[0083] Table 3 Although washing tablets can be made in Comparative Examples 1 and 2, according to the test results in Table 3, the washing tablets prepared in Comparative Examples 1-2 have poor wet and high-temperature resistance, and the quality of the formed tablets is not good.

[0084] [Corrected according to Rule 91 on 23.01.2025] 4. Fabric conditioning and antistatic test: The test is carried out according to GB / T16801-2013 "Determination of Antistatic Performance of Fabric Conditioners". The test concentration of the washing tablets to be tested is 2.5 g / L, and the logarithmic difference of the surface specific resistance △lgρs≥2.5 is qualified. The test polyester cloth is purchased from the National Institute of Daily Chemical Industry. The results are recorded in Table 4.

[0085] Table 4 5. Surface roughness test: The surface roughness of the polyester cloth after washing is tested with a surface roughness tester, and a pointer with a diameter of 10 μm suitable for soft materials is selected. Four samples are selected for each sample for the test. The results are recorded in Table 5.

[0086] 6. Subjective evaluation of fabric handle: According to Appendix A of FZ / T 01171-2023 "Textiles - Testing and Evaluation Methods for Fabric Touch - Three - point Beam Method", the surface roughness of the washed fabric was evaluated and scored on a 100 - point scale. Scores ≤ 59 are very rough, 60 - 69 are rough, 70 - 80 are less smooth, 81 - 90 are smooth, and 91 - 100 are very smooth. The unwashed polyester fabric was used as a control. The results were recorded in Table 5.

[0087] Table 5 7. Detergency test: According to GB / T 13174-2021 "Determination of Detergency and Recycling Washing Performance of Detergents for Clothing Fabrics", the washing water was 250 mg / kg CaCl2 hard water. The test cloth pieces were national standard carbon black JB - 01 soiled cloth, national standard protein JB - 02 soiled cloth, and national standard sebum JB - 03 soiled cloth, and the detergency was determined.

[0088] Taking 0.2% standard laundry detergent as a control, the detergency ratio Pi was obtained. When Pi ≥ 1.0, it was qualified; when Pi < 1.0, it was unqualified. The results were recorded in Table 6.

[0089] Table 6 Compared with Comparative Example 3, the detergency performance of Example 1 changed little, indicating that using an amino acid surfactant - based softener did not result in a mutually exclusive phenomenon between softening and detergency performance. Although the washing sheet of Comparative Example 1 could form sheets, compared with Comparative Example 3, its detergency performance was poor, indicating that some strong cationic softeners electrostatically adsorbed with anionic surfactants, reducing the detergency ability.

[0090] Replacing the non - ionic surfactant in Example 1 gave Comparative Examples 4 and 5, and replacing the anionic surfactant gave Comparative Example 6. According to the above test results, the destruction of the special construction system had a greater impact on the detergency and antistatic performance of the washing sheet.

[0091] The corrosion situation diagram of the metal surface of the sheet - making equipment for the washing sheet of Comparative Example 1 is shown in Figure 2.

[0092] This specific embodiment is only an interpretation of the present application, and it is not a limitation of the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A softening, antistatic, stain-removing detergent sheet, characterized in that, The raw materials for preparing the softening, antistatic, and stain-removing detergent sheets include the following components by weight percentage: 6-35% film-forming agent, 5-20% anionic surfactant, 1-10% nonionic surfactant, 1-15% softener, 0-10% conditioning agent, 3-20% filler, 0.2-5% chelating agent, 0.5-2% fragrance, and water; The film-forming agent is polyvinyl alcohol or a combination of polyvinyl alcohol and polyvinylpyrrolidone; Anionic surfactants include at least one of sodium alkyl hydroxyethyl sulfonate, sodium oleoethoxy sulfonate, and sodium fatty alcohol polyoxyethylene ether sulfate. Nonionic surfactants include at least two of the following: fatty amine polyglycerol ethers, oleic acid ethoxylates, fatty acid glycerides, sucrose fatty acid esters, methyl glucotrioleate, glyceryl laurate, and fatty acid methyl ester ethoxylates. Fabric softeners include at least one of sodium methyl lauroyl taurate, sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, sodium cocoyl sarcosinate, sodium lauroyl alanine, sodium cocoyl alanine, sodium lauroyl glycinate, and sodium cocoyl glycinate.

2. The softening, antistatic, and stain-removing detergent sheet according to claim 1, characterized in that: The raw materials for preparing the softening and antistatic detergent sheets include the following components by weight percentage: 12.5-20% film-forming agent, 15-20% anionic surfactant, 4-7% nonionic surfactant, 5-10% softener, 1-3% conditioning agent, 3-10% filler, 1.5-3% chelating agent, 0.5-2% fragrance, and water.

3. The softening, antistatic, and stain-removing detergent sheet according to claim 1, characterized in that: The film-forming agent is a mixture of polyvinyl alcohol and polyvinylpyrrolidone, and the mass ratio of polyvinyl alcohol to polyvinylpyrrolidone is 3-25:

1.

4. The softening, antistatic, and stain-removing detergent sheet according to claim 1, characterized in that: The anionic surfactant is sodium alkyl hydroxyethyl sulfonate, the nonionic surfactant is a mixture of fatty amine polyglycerol ether and fatty acid methyl ester ethoxylate, and the softener is sodium methyl lauroyl taurate.

5. The softening, antistatic, and stain-removing detergent sheet according to claim 4, characterized in that: In the raw materials for preparing the softening and antistatic detergent sheet, the weight percentage of sodium alkyl hydroxyethyl sulfonate is 12-18%, the weight percentage of fatty amine polyglycerol ether is 3-8%, the weight percentage of fatty acid methyl ester ethoxylate compound is 1-3%, and the weight percentage of sodium methyl lauroyl taurate is 5-8%.

6. The softening, antistatic, and stain-removing detergent sheet according to claim 1, characterized in that: The conditioning agent includes at least one of alkyl dimethyl polyoxyethylene ammonium chloride, monoalkyl dimethyl hydroxyethyl ammonium chloride, and chloro-2-hydroxy-3-(trimethylamino)propyl polyoxyethylene cellulose ether.

7. The softening, antistatic, and stain-removing detergent sheet according to claim 1, characterized in that: The filler is plant starch.

8. The softening, antistatic, and stain-removing detergent sheet according to claim 7, characterized in that: The plant starch includes at least one of corn starch, pea starch, and tapioca starch.

9. The softening, antistatic, and stain-removing detergent sheet according to claim 1, characterized in that: The chelating agent includes at least one of sodium polyaspartate, citric acid and its salts, and gluconic acid and its salts.

10. A method for preparing a softening, antistatic, and stain-removing detergent sheet according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Disperse the chelating agent with water to obtain a chelating agent dispersion; disperse the filler with water to obtain a filler dispersion; Step 2: Mix the film-forming agent with water at 80-90℃ until the material swells and dissolves completely; Step 3: Add anionic surfactant to the material from Step 2 and wait until it is completely dissolved without any lumps. Then add nonionic surfactant and dissolve it completely. Step 4: Mix the filler dispersion with the material from Step 3; Step 5: Mix the chelating agent dispersion with the material from Step 4; Step 6: Add fabric softener to the material from Step 5 and continue stirring until it is completely dissolved and free of lumps. Step 7: After the material from Step 6 has cooled down to 45-55℃, add the remaining raw materials and stir evenly to obtain a slurry; Step 8: Dry the slurry from Step 7 at 80-120℃, shape it into sheets, and obtain a soft, antistatic, stain-removing detergent sheet.

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