Long-lasting fragrance-retaining flexible porous water-type detergent tablet and preparation method thereof

Abstract

This application discloses a long-lasting fragrance-retaining flexible porous water-based detergent sheet and its preparation method, relating to the field of detergent products. A long-lasting fragrance-retaining flexible porous water-based detergent sheet comprises the following raw materials in parts by weight: anionic surfactant: 40-70 parts; modified cellulose: 16-33 parts; microbial polysaccharide: 0.2-5 parts; nonionic surfactant: 1-17 parts; enzyme preparation: 0.1-5 parts; water softener: 0.5-7 parts; fragrance: 0.5-8 parts; antibacterial and anti-mite agent: 0.01-2 parts; antioxidant: 0.01-1 parts; water-soluble inorganic salt: 0.05-2 parts. This application provides a detergent sheet that achieves rapid dissolution without residue, stable storage, long-lasting fragrance, and is more environmentally friendly, without the risk of vinyl acetate residue, and possesses excellent mechanical properties and flexibility.

Description

Technical Field

[0001] This invention relates to the field of washing products, and in particular to a long-lasting fragrance flexible porous water-based washing sheet and its preparation method. Background Technology

[0002] Film-forming agents are essential and widely used raw materials in detergent sheets, with polyvinyl alcohol (PVA) being the most common. However, vinyl acetate is used in the industrial synthesis of PVA, and vinyl acetate is carcinogenic, with the risk primarily existing in the production process (such as monomer residues from the polymerization reaction). Therefore, detergent sheets made with PVA carry the potential risk of residual vinyl acetate, necessitating the search for alternatives to PVA.

[0003] Modified cellulose is a biodegradable, water-soluble polymer. By introducing negative charges and hydrophilic groups through modifications such as hydroxyethyl and hydroxypropyl groups, it is a viable alternative to polyvinyl alcohol. However, modified cellulose presents several problems when used in detergent tablets: First, modified cellulose exhibits shear thinning, and its viscosity is affected when mixed with large amounts of surfactants. Specifically, anionic surfactants introduce negative charges, which shield or weaken the repulsive forces between charges in the modified cellulose, causing the molecular chains to coil and resulting in decreased viscosity. Nonionic surfactant molecules alter the solvation layer structure around the modified cellulose molecular chains, affecting both solubility and viscosity. Secondly, the hydroxyl and methoxy groups in modified cellulose will accelerate oxidation at high temperatures, leading to a decrease in film-forming properties. In production, polyols are generally added to improve the film-forming properties of modified cellulose at high temperatures, while also improving the mechanical properties and flexibility of the finished product. However, polyols and modified cellulose are highly hydrophilic and easily form gel clusters with water molecules that remain on the fabric. Furthermore, as the water evaporates, the hygroscopicity further increases, which can easily lead to moisture absorption and oil seepage. Fillers and adsorbents are needed to improve this phenomenon, but fillers and adsorbents will negatively affect the flexibility and mechanical properties of the detergent sheets.

[0004] Because the manufacturing process of detergent tablets requires high-temperature drying, the fragrance retention rate is low. To achieve a fragrance retention effect, an excessive amount of fragrance needs to be added. However, as fragrance is an oily substance, adsorbents and fillers need to be added to the detergent tablets in advance to achieve the addition of an excessive amount of fragrance. However, adsorbents and fillers have the defect that they cannot completely release the fragrance.

[0005] Therefore, in order to solve the above problems, it is necessary to develop a detergent sheet that can achieve rapid dissolution without residue, stable storage, long-lasting fragrance, and is more environmentally friendly, without the risk of vinyl acetate residue, and with excellent mechanical properties and flexibility. Summary of the Invention

[0006] To achieve the above effects, this application provides a long-lasting fragrance-retaining flexible porous water-based detergent sheet and its preparation method.

[0007] This application provides a long-lasting, fragrance-retaining, flexible, porous, water-based detergent sheet and its preparation method, using the following technical solution:

[0008] In a first aspect, this application provides a long-lasting, fragrance-retaining, flexible, porous, water-based detergent sheet, comprising the following raw materials in parts by weight:

[0009] Anionic surfactants: 40-70 parts; modified cellulose: 16-33 parts; microbial polysaccharides: 0.2-5 parts; nonionic surfactants: 1-17 parts; enzyme preparations: 0.1-5 parts; water softeners: 0.5-7 parts; fragrances: 0.5-8 parts; antibacterial and anti-mite agents: 0.01-2 parts; antioxidants: 0.01-1 parts; water-soluble inorganic salts: 0.05-2 parts;

[0010] The anionic surfactant is selected from at least two of C8-C22 fatty alcohol sulfate, sodium α-alkenyl sulfonate, aminosulfonate, and sodium xylene sulfonate.

[0011] The nonionic surfactant is selected from at least one of the following: glycoside citrate, alkyl glucoside, maltodextrin, alkyl xyloside, natural saponins, and tea saponin.

[0012] By adopting the above technical solution, modified cellulose and microbial polysaccharides are used to replace polyvinyl alcohol in the raw materials of detergent tablets. At the same time, ethoxylated surfactants are not used, eliminating the risk of vinyl acetate and dioxane residues, making it more environmentally friendly, safe, and with a long-lasting fragrance. Microbial polysaccharides have good film-forming and oxygen-barrier properties, and can replace polyols, ensuring the film-forming and viscosity properties of modified cellulose at high temperatures. No fillers or adsorbents are added to the raw materials, resulting in excellent flexibility and mechanical properties of the detergent tablets.

[0013] When modified cellulose is mixed with specific anionic surfactants, it forms mixed micelles, transforming the intrachain association of modified cellulose into interchain association. This results in a gradual increase in the apparent viscosity of the slurry system, which remains unchanged regardless of shear force. The carboxymethyl and hydroxyl groups of modified cellulose combine with glycoside nonionic surfactants rich in hydrogen bond acceptors or donors, altering the molecular structure of modified cellulose, reducing the exposure of hydrophilic groups, and improving the high hygroscopicity of modified cellulose. During storage, its moisture resistance can be significantly improved. At the same time, the specific nonionic surfactants do not affect the stability of the formed mixed micelles within the specified addition range. Therefore, the detergent tablets are stable in formation and have good storage stability.

[0014] Fragrance molecules are hydrophobic and can be attracted and encapsulated by the hydrophobic core of mixed micelles. This physical encapsulation reduces the direct contact between the fragrance and the external environment, lowers the evaporation rate, reduces its volatilization at high temperatures, and improves the fragrance retention rate. It can also isolate oxygen, slow down the oxidation and decomposition of the fragrance during storage, and achieve a long-lasting fragrance effect.

[0015] Preferably, the modified cellulose is selected from at least one of hydroxyethyl methyl cellulose, carboxylated nanocellulose, and hydroxypropyl methyl cellulose.

[0016] By adopting the above technical solution, hydrophilic groups such as hydroxyethyl, hydroxypropyl, and carboxyl are introduced into cellulose through modification, enabling the modified cellulose to dissolve rapidly in water while maintaining high viscosity, thus serving as a film-forming agent for detergent sheets.

[0017] Preferably, the microbial polysaccharide is selected from at least one of pullulan, xanthan gum, and kerogen.

[0018] By adopting the above technical solution, microbial polysaccharides have good film-forming and oxygen barrier properties. Active ingredients such as enzymes and fragrances are easily degraded and ineffective due to oxygen. The oxygen barrier properties of microbial polysaccharides can form a dense film layer, effectively blocking oxygen penetration, slowing down the oxidative decomposition rate of active ingredients, and thus extending the shelf life of the product.

[0019] Preferably, the enzyme preparation is selected from at least one of protease, cellulase, amylase, phosphodiesterase, pectinase, mannanase, and lipase.

[0020] Preferably, the cellulase, pectinase, and mannanase are in solid form.

[0021] By adopting the above technical solution, the enzyme preparation promotes the decomposition of organic matter in the stains under catalysis. Through the cooperation of different types of enzyme preparations, the stains of various types can be accurately removed, thereby improving the detergency of the washing composition.

[0022] Preferably, the water-soluble inorganic salt is selected from at least one of sodium carbonate, sodium bicarbonate, sodium sulfate, and sodium bisulfate, and has a particle size of 500-1000 μm.

[0023] By adopting the above technical solution, the addition of water-soluble inorganic salts can improve the detergency of the detergent sheets and achieve better washing results.

[0024] Preferably, the fragrance is selected from at least one of plant essential oils, liquid fragrances, nano fragrance emulsions, and microcapsule fragrances.

[0025] By adopting the above technical solution, the addition of fragrance can give the detergent tablets a scent, and through the encapsulation and protection of mixed micelles, volatilization and decomposition during the preparation and storage processes are reduced, resulting in a longer-lasting fragrance.

[0026] Preferably, the water softener is selected from at least one of sodium citrate, tetrasodium iminodisuccinate, tetrasodium glutamate diacetate, sodium gluconate, and sodium methylglycine diacetate.

[0027] By adopting the above technical solution, the addition of water softener can soften the water, thereby enabling surfactants to penetrate fabrics more effectively to disperse stains, improve cleaning power, and prevent fabrics from becoming stiff.

[0028] Preferably, the antioxidant is selected from at least one of butylated hydroxytoluene, ascorbate palmitate, and tert-butylhydroquinone.

[0029] By adopting the above technical solution, the addition of antioxidants can reduce the negative impact of active ingredients being degraded and rendered ineffective by oxygen oxidation on the detergent sheets.

[0030] Preferably, the antibacterial and anti-mite agent includes at least one of dichlorobenzyl alcohol, cymene, Sichuan pepper extract, phenoxyethanol, 1,2-benzisothiazolin-3-one, diclofenac, silver citrate, and 2,4-dichlorobenzyl alcohol.

[0031] By adopting the above technical solution, the antibacterial and anti-mite agent enables the detergent sheets to have a good antibacterial and anti-mite effect on fabrics.

[0032] Secondly, this application provides a method for preparing a long-lasting fragrance-retaining flexible porous water-based detergent sheet as described in the first aspect, comprising the following steps:

[0033] S1, heat the solvent water and mix it with modified cellulose, nonionic surfactant, water softener and anionic surfactant, stir and dissolve until homogeneous to obtain a mixture; add microbial polysaccharide, antibacterial and anti-mite agent, antioxidant and fragrance to the mixture, and add or not add liquid enzyme preparation as needed, stir to obtain slurry;

[0034] S2, the obtained slurry is dried and made into tablets, and water-soluble inorganic salts are sprayed on at this stage. Solid enzyme preparations may or may not be added as needed to obtain the long-lasting fragrance flexible porous water-based detergent tablets.

[0035] In this application, the added enzyme preparation can be a liquid enzyme preparation or a solid enzyme preparation. When the enzyme preparation is a liquid enzyme preparation, it is added during the slurry preparation process in step S1; when the enzyme preparation is a solid enzyme preparation, it is added in step S2. The liquid enzyme preparation and the solid enzyme preparation can be added simultaneously or separately.

[0036] By adopting the above technical solution, adding solid enzyme preparations and water-soluble inorganic salts in the post-drying stage avoids the problem of solid crystal precipitation caused by water evaporation during the drying process, thus improving the detergency of the detergent sheets.

[0037] Preferably, the temperature of the solvent water is 50-60°C.

[0038] Preferably, the thickness of the washing sheet is 0.1-2 mm.

[0039] In summary, this application has at least one of the following beneficial effects:

[0040] 1. When modified cellulose is mixed with specific anionic surfactants, it forms mixed micelles, transforming the modified cellulose from intrachain association to interchain association. This results in a gradual increase in the apparent viscosity of the slurry system, which remains unchanged regardless of shear force. The carboxymethyl and hydroxyl groups of the modified cellulose combine with glycoside nonionic surfactants rich in hydrogen bond acceptors or donors, altering the molecular structure of the modified cellulose, reducing the exposure of hydrophilic groups, and improving the high hygroscopicity of the modified cellulose. During storage, its moisture resistance can be significantly improved. At the same time, the specific nonionic surfactants do not affect the stability of the formed mixed micelles within the specified addition range. Therefore, the detergent sheets are stable in formation and have good storage stability.

[0041] 2. Fragrance molecules are hydrophobic and can be attracted and encapsulated by the hydrophobic core of the mixed micelles. Through physical encapsulation, the direct contact between the fragrance and the external environment is reduced, the evaporation rate is lowered, the evaporation at high temperatures is reduced, and the fragrance retention rate is improved. It can also isolate oxygen, slow down the oxidation and decomposition of the fragrance during storage, and achieve a long-lasting fragrance effect. Attached Figure Description

[0042] Figure 1 An image of the washing tablet prepared in Example 1 of this application;

[0043] Figure 2 An image of the washing tablet prepared in Example 2 of this application;

[0044] Figure 3 An image of the washing tablet prepared in Comparative Example 5 of this application;

[0045] Figure 4 An image of the washing tablet prepared in Comparative Example 6 of this application;

[0046] Figure 5 An image of the washing tablet prepared in Comparative Example 7 of this application;

[0047] Figure 6 An image of the washing tablet prepared in Comparative Example 8 of this application;

[0048] Figure 7 An image of the washing tablet prepared for Comparative Example 10 of this application;

[0049] Figure 8 Microscopic image of the washing sheet prepared in Example 1 of this application;

[0050] Figure 9 This is a microscope image of the washing slide prepared in Comparative Example 5 of this application. Detailed Implementation

[0051] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail. Example

[0052] Example 1

[0053] A long-lasting, fragrance-retaining, flexible, porous, water-based detergent sheet, comprising the following raw materials in parts by weight:

[0054] The ingredients include 60 parts anionic surfactant, 16 parts modified cellulose, 3 parts microbial polysaccharide, 10 parts nonionic surfactant, 1 part enzyme preparation, 3 parts water softener, 1.5 parts fragrance, 0.05 parts antibacterial and anti-mite agent, 0.02 parts antioxidant, and 1 part water-soluble inorganic salt.

[0055] The anionic surfactant is a compound of C8-C22 fatty alcohol sulfate and sodium xylene sulfonate, specifically 50 parts of C18 fatty alcohol sulfate and 10 parts of sodium xylene sulfonate.

[0056] The modified cellulose specifically selected is carboxylated cellulose.

[0057] Pullulan was specifically selected as the microbial polysaccharide.

[0058] The specific nonionic surfactant selected is alkyl glucoside.

[0059] The specific enzyme preparation used is liquid protease.

[0060] Sodium citrate is the specific water softener to be used.

[0061] The fragrance is specifically selected as a liquid fragrance.

[0062] Dichlorobenzyl alcohol is the specific antibacterial and anti-mite agent to be selected.

[0063] The specific antioxidant selected is butylated hydroxytoluene.

[0064] Sodium carbonate is the specific water-soluble inorganic salt to be selected.

[0065] A method for preparing a long-lasting fragrance-retaining flexible porous water-based detergent sheet includes the following steps:

[0066] S1, Modified cellulose, nonionic surfactant, water softener and anionic surfactant are added sequentially to solvent water at 60℃; after stirring and dissolving until homogeneous, microbial polysaccharide, antibacterial and anti-mite agent, antioxidant, fragrance and liquid enzyme preparation are added sequentially, and stirred for 5 minutes to obtain slurry;

[0067] S2, the obtained slurry is dried by a drum-type or cast coating dryer. In this embodiment, the slurry is dried at 70°C by a drum-type dryer to form a sheet, and water-soluble inorganic salt is sprayed on during this stage. The weight ratio of solvent water and all other raw materials is 8:1.

[0068] After testing, the thickness of the long-lasting fragrance flexible porous water-based washing sheet prepared in this embodiment is 0.7 mm.

[0069] Examples 2-6

[0070] The difference between Examples 2-6 and Example 1 is that the raw materials of the detergent tablets are different, as shown in Table 1.

[0071] In Example 2, the method for preparing the detergent tablets includes the following steps:

[0072] S1, Modified cellulose, nonionic surfactant, water softener and anionic surfactant are added sequentially to solvent water at 50℃; after stirring and dissolving until homogeneous, microbial polysaccharide, antibacterial and anti-mite agent, antioxidant, fragrance and liquid enzyme preparation are added sequentially, and stirred for 5 minutes to obtain slurry;

[0073] S2, the obtained slurry is dried by a roller or cast coating dryer. In this embodiment, the slurry is dried at 70°C by a cast coating dryer to form a sheet. During this stage, solid enzyme preparation and water-soluble inorganic salt are sprayed on. The weight ratio of solvent water and all other raw materials is 10:1.

[0074] The preparation methods of the detergent tablets in Examples 3-6 are the same as those in Example 1.

[0075] Table 1

[0076]

[0077]

[0078] In Example 3, C8-C22 fatty alcohol sulfate was specifically selected from C12 fatty alcohol sodium sulfate; in Example 4, C8-C22 fatty alcohol sulfate was specifically selected from C12 fatty alcohol sodium sulfate; and in Example 6, C8-C22 fatty alcohol sulfate was specifically selected from C18 fatty alcohol potassium sulfate.

[0079] In Examples 2 and 5, sodium aminosulfonate was specifically used as the aminosulfonate, while in Example 3, potassium aminosulfonate was specifically used as the aminosulfonate. Comparative Example

[0080] Comparative Example 1

[0081] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0082] In this comparative example, an equal amount of water was used to replace the water-soluble inorganic salt, i.e., the amount of sodium carbonate used was 0.

[0083] Comparative Example 2

[0084] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0085] In this comparative example, an equal amount of starch was used to replace microbial polysaccharides, that is, pullulan was used in a 0-part form and starch was used in a 3-part form.

[0086] Comparative Example 3

[0087] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0088] In this comparative example, an equal amount of glycerol was used to replace the nonionic surfactant, i.e., the amount of alkyl glucoside was 0 parts and the amount of glycerol was 10 parts.

[0089] Comparative Example 4

[0090] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0091] In this comparative example, the anionic surfactant was 50 parts by weight, specifically 45 parts of C18 fatty alcohol sodium sulfate and 5 parts of sodium xylenesulfonate; the nonionic surfactant was 20 parts by weight, specifically alkyl glucoside.

[0092] Comparative Example 5

[0093] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0094] In this comparative example, the anionic surfactant was 72 parts by weight, specifically 62 parts of C18 fatty alcohol sodium sulfate and 10 parts of sodium xylenesulfonate; the nonionic surfactant was 1 part, specifically alkyl glucoside.

[0095] Comparative Example 6

[0096] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0097] In this comparative example, the modified cellulose was 14 parts by weight, specifically carboxylated nanocellulose; and the microbial polysaccharide was 5 parts by weight, specifically pullulan.

[0098] Comparative Example 7

[0099] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0100] In this comparative example, equal amounts of polyvinyl alcohol were used to replace modified cellulose and microbial polysaccharides, namely carboxylated nanocellulose, pullulan polysaccharide was used at 0 parts, and polyvinyl alcohol was used at 19 parts.

[0101] Comparative Example 8

[0102] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0103] In this comparative example, an equal amount of sodium dodecylbenzenesulfonate was used to replace the anionic surfactant, i.e., the amount of C18 fatty alcohol sodium sulfate and sodium xylenesulfonate was 0, and the amount of sodium dodecylbenzenesulfonate was 60 parts.

[0104] Comparative Example 9

[0105] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0106] In this comparative example, an equal amount of rhamnolipin was used to replace the nonionic surfactant, i.e., the amount of alkyl glucoside was 0 and the amount of rhamnolipin was 10 parts.

[0107] Comparative Example 10

[0108] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0109] In this comparative example, the modified cellulose was 40 parts by weight, specifically carboxylated nanocellulose, and the anionic surfactant was 38 parts by weight, specifically 30 parts of C18 fatty alcohol sulfate and 8 parts of sodium xylenesulfonate.

[0110] Comparative Example 11

[0111] The difference between this comparative example and Example 1 is that the raw materials used to prepare the detergent tablets are different.

[0112] In this comparative example, the modified cellulose was 19 parts by weight, specifically carboxylated nanocellulose, and the microbial polysaccharide was 0 parts by weight.

[0113] Figures 1-7 The molding conditions of the detergent tablet samples prepared in Examples 1-2, Comparative Examples 5-8, and Comparative Example 10 are shown respectively. Figure 8Microscopic images of the washing slides prepared in Example 1 are provided. Figure 9 Microscopic images of the washing slide prepared in Comparative Example 5 are provided.

[0114] Combination Figures 1-9 It can be seen that the detergent tablets prepared in Examples 1-2 have uniform pores and dissolve quickly; the detergent tablets prepared in Comparative Example 5 have crystals precipitated on the surface, and the pores are uneven and incomplete, making dissolution difficult; the detergent tablets prepared in Comparative Example 6 also have crystals precipitated on the surface, and the detergent tablets have poor toughness and are easily broken; the detergent tablets prepared in Comparative Example 7 have poor cleaning ability; the detergent tablets prepared in Comparative Example 8 have poor toughness and are easily broken; the detergent tablets prepared in Comparative Example 10 have unstable forming, poor tablet formation, and are difficult to dissolve.

[0115] Performance testing:

[0116] 1. Stain removal performance test: According to GB / T 13174-2021 "Determination of stain removal power and recycle performance of detergents for clothing", the detergent sheets were prepared into a 0.05% solution, and a 0.2% standard laundry detergent was used as a control to obtain the stain removal ratio Pi. The washing conditions are shown in Table 2, and the results are recorded in Table 3.

[0117] Table 2 Washing Conditions

[0118] [Table 1_sm_0001] Hardness of washing water 250mg / kg Washing water temperature 30℃ Washing time 20min Washing speed 120rpm Simulated washing equipment models RHLQ-IV Multifunctional Vertical Decontamination Testing Machine

[0119] Table 3. Decontamination performance results

[0120] [Table 1_sm_0002] National Standard Carbon Black Soiled Cloth National Standard Protein Soil-Contaminated Cloth National Standard Sebum-Staining Cloth determination Example 1 1.24 2.01 1.33 qualified Example 2 1.41 2.23 1.21 qualified Example 3 1.18 3.16 1.45 qualified Example 4 1.30 3.97 1.39 qualified Example 5 1.28 3.35 1.28 qualified Example 6 1.34 3.68 1.41 qualified Comparative Example 1 1.20 1.92 1.21 qualified Comparative Example 3 0.98 1.67 0.81 Unqualified Comparative Example 7 0.98 1.79 1.13 Unqualified Comparative Example 8 0.99 1.81 1.16 Unqualified Comparative Example 9 1.12 1.90 0.99 Unqualified Comparative Example 10 1.09 1.50 1.01 qualified

[0121] According to the detergency results in Table 3, the detergent sheets prepared in this application have strong detergency and their detergency performance is qualified.

[0122] Compared to Example 1, Comparative Example 1 did not add water-soluble inorganic salts to the raw materials of the detergent tablets, resulting in a decrease in detergency; Comparative Example 3 used glycerol instead of nonionic surfactants, resulting in a decrease in detergency; Comparative Examples 7-9 changed the modified cellulose and microbial polysaccharides, anionic surfactants and nonionic surfactants in the raw materials of the detergent tablets, respectively, which made it impossible to form stable micelles after mixing the modified cellulose and specific anionic surfactants and specific nonionic surfactants as described in this application, resulting in unstable molding of the detergent tablets, affecting the viscosity of the system, and failing to meet the detergency requirements; the proportion of modified cellulose and anionic surfactants in Comparative Example 10 was not within the range of this application, resulting in poor solubility of the detergent tablets and a decrease in detergency.

[0123] 2. High humidity test

[0124] A box of detergent tablets (cardboard box with detergent tablets stacked inside) was placed in a test environment with a temperature of (40±2)℃ and a relative humidity of (75±5)%. The test was repeated for 4 sets. After 24 hours, one set was taken out and the two detergent tablets were separated. The results were recorded in Table 4.

[0125] Table 4. Results of High Humidity Test

[0126] [Table 1_sm_0003] Adhesion Oil seepage Example 1 none none Example 2 none none Example 3 none none Example 4 none none Example 5 none none Example 6 none none Comparative Example 2 slight adhesion Severe oil seepage Comparative Example 3 Severe adhesion Severe oil seepage Comparative Example 4 slight adhesion Slight oil seepage Comparative Example 9 Adhesion Severe oil seepage Comparative Example 11 slight adhesion Slight oil seepage

[0127] According to the high humidity test results in Table 4, the detergent tablets prepared in this application improve their moisture resistance by using specific glycoside nonionic surfactants combined with modified cellulose, which reduces the exposure of hydrophilic groups in the modified cellulose. Using microbial polysaccharides instead of polyols allows the polysaccharides to form a dense film layer, blocking oxygen penetration and reducing the oxidative decomposition of active ingredients such as modified cellulose, thus ensuring the storage stability of the detergent tablets. Therefore, by adding nonionic surfactants and microbial polysaccharides, the detergent tablets will not stick or leak oil even in high humidity environments.

[0128] In Comparative Examples 2 and 11, no microbial polysaccharides were added to the raw materials; in Comparative Example 9, no specific glycoside nonionic surfactants were added. Both of these resulted in the detergent sheets sticking together and leaking oil under high humidity conditions.

[0129] In Comparative Example 3, glycerol was used instead of nonionic surfactant. Glycerol is highly hygroscopic. In the high humidity test, both glycerol and modified cellulose are not moisture-resistant, which led to severe adhesion and oil seepage, affecting the storage and use of the detergent tablets.

[0130] In Comparative Example 4, the content of nonionic surfactant exceeded the range of Weight 1, resulting in surfactant precipitation on the surface of the detergent sheet, causing adhesion and oil seepage.

[0131] 3. Water solubility test

[0132] 700 mL of hard water (250 mg / kg calcium chloride) was placed in a 1 L beaker and placed in a water bath at (15 ± 2) °C. The stirring speed of the magnetic stirrer was adjusted to 1000 r / min. The detergent tablets were cut into 3 cm * 3 cm square pieces and dropped vertically into the water at a distance of 10 cm parallel to the water surface. The timer started when the detergent tablets touched the water surface and stopped when the sample was completely dispersed in the water. The dissolution time was obtained. This process was repeated 3 times. The results are recorded in Table 5.

[0133] 4. Washing machine detergent residue test

[0134] Prepare four garments made of different materials. Place a 4g sample of detergent tablet into the cuff of each garment or trouser leg and tie them together with a rubber band. Then wrap each garment in a large white cloth (two cloths for each garment). Wash the garments in a washing machine on cycle 39 minutes. After washing, remove the garments and check for any residue. Record the results in Table 5.

[0135] Table 5 Results of water solubility test and washing machine residue test

[0136] [Table 1_sm_0004] Dissolution time Washing residue Example 1 42 seconds none Example 2 57 seconds none Example 3 45 seconds none Example 4 53 seconds none Example 5 46 seconds none Example 6 54 seconds none Comparative Example 5 3 minutes and 11 seconds have Comparative Example 10 2 minutes and 36 seconds have

[0137] The data in Table 5 show that the detergent sheets prepared in this application dissolve quickly, are clear after dissolution, and leave no detergent residue on the fabric.

[0138] When detergent tablets dissolve too slowly, detergent residue can remain. The detergent tablets in Comparative Examples 5 and 10 exhibited poor solubility and prolonged dissolution times, resulting in detergent residue. Specifically, in Comparative Example 5, an excessive amount of anionic surfactant was used, causing surfactant powder crystals to precipitate on the surface of the detergent tablet. This excessive surfactant was incompatible with the modified cellulose and microbial polysaccharides, leading to difficulty in dissolving the detergent tablet. In Comparative Example 10, an excessive amount of modified cellulose and a insufficient amount of anionic surfactant similarly affected the compatibility between the two, impacting the formation of mixed micelles and resulting in poor solubility.

[0139] 5. Flexibility test of detergent sheets

[0140] The detergent sheets were cut into 10cm*10cm squares, and the flexibility of the detergent sheets was tested using a DRK119 softness tester. The greater the force value, the worse the flexibility of the detergent sheet, and vice versa. Flexibility is the key to continuous mass production. The results are recorded in Table 6.

[0141] Table 6 Flexibility Test Results

[0142] Force mN Test the condition of the film Example 1 529.4 No significant changes Example 2 664.9 No significant changes Example 3 498.6 No significant changes Example 4 667.5 No significant changes Comparative Example 1 1562.5 Mid-break Comparative Example 2 1646.8 Mid-break Comparative Example 4 1654.4 Mid-break Comparative Example 6 1971.5 Mid-break

[0143] As can be seen from the data in Table 6, the detergent sheets prepared in this application have excellent flexibility and can be mass-produced.

[0144] In Comparative Example 4, excessive use of nonionic surfactant can affect the stability of the mixed micelles formed between anionic surfactants and modified cellulose, thus affecting the viscosity of the system and reducing the flexibility of the detergent sheets.

[0145] In Comparative Example 2, the microbial polysaccharide was replaced with the filler starch. The use of starch increased the brittleness of the detergent tablets, which affected their flexibility. In Comparative Example 6, the proportion of modified cellulose was too low, which affected the film-forming properties and viscosity of the detergent tablets. Even the use of more microbial polysaccharide could not compensate for the adverse effect on flexibility.

[0146] 6. Fragrance Longevity Test

[0147] ① Scent test of detergent tablets: Seal the sliced ​​detergent tablets and let them stand for 4 hours to reach equilibrium. Then conduct a scent test and rank them. The one with the strongest scent is ranked first. Record the results in Table 6.

[0148] ② Compared with sealed packaging detergent tablets, the opened detergent tablets were placed in an environment of (30±2)℃ and (60±5)% relative humidity to simulate the environment after consumers use the product. One tablet was removed each day, and the last detergent tablet was used for a washing and fragrance retention test. The washing machine was used for 39 minutes, and the fabric for smelling was a pure cotton white garment. The fragrance test was conducted on the 1st and 30th days after natural drying, and the results were divided into strong fragrance, medium fragrance, light fragrance, and no fragrance. The results are recorded in Table 7.

[0149] Table 7. Fragrance retention test results

[0150]

[0151] As shown in Table 7, this application achieves a longer-lasting fragrance by using modified cellulose and microbial polysaccharides instead of polyvinyl alcohol. The modified cellulose, when mixed with a specific anionic surfactant, generates micelles. These micelles encapsulate fragrance molecules, slowing down their volatilization and oxidative decomposition, thus extending the fragrance duration. The addition of microbial polysaccharides slows down the rate at which fragrance molecules decompose due to oxygen oxidation, further contributing to the longer-lasting fragrance.

[0152] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A long-lasting, fragrance-retaining, flexible, porous, water-based detergent sheet, characterized in that: Including the following parts by weight of raw materials: Anionic surfactant: 40-70 parts; Modified cellulose: 16-33 parts; Microbial polysaccharides: 0.2-5 parts; Nonionic surfactant: 1-17 parts; Enzyme preparation: 0.1-5 parts; Water softener: 0.5-7 parts; Fragrance: 0.5-8 parts; Antibacterial and anti-mite agent: 0.01-2 parts; Antioxidant: 0.01-1 part; Water-soluble inorganic salts: 0.05-2 parts; The anionic surfactant is selected from C8-C22 fatty alcohol sulfates and sodium α-olefin sulfonate. At least two of aminosulfonates and sodium xylenesulfonate; The nonionic surfactant is selected from at least one of the following: glycoside citrate, alkyl glucoside, maltodextrin, alkyl xyloside, natural saponins, and tea saponin.

2. The long-lasting fragrance flexible porous water-based detergent sheet according to claim 1, characterized in that: The modified cellulose is selected from hydroxyethyl methyl cellulose and carboxylated nanocellulose. At least one of hydroxypropyl methylcellulose.

3. The long-lasting fragrance flexible porous water-based detergent sheet according to claim 1, characterized in that: The microbial polysaccharide is selected from at least one of pullulan, xanthan gum, and kerogen.

4. The long-lasting fragrance flexible porous water-based detergent sheet according to claim 1, characterized in that: The enzyme preparation is selected from at least one of protease, cellulase, amylase, phosphodiesterase, pectinase, mannanase, and lipase.

5. The long-lasting fragrance flexible porous water-based detergent sheet according to claim 1, characterized in that: The water-soluble inorganic salt is selected from at least one of sodium carbonate, sodium bicarbonate, sodium sulfate, and sodium bisulfate.

6. The long-lasting fragrance flexible porous water-based detergent sheet according to claim 1, characterized in that: The fragrance is selected from at least one of the following: plant essential oils, liquid fragrances, nano fragrance emulsions, and microcapsule fragrances.

7. The long-lasting fragrance flexible porous water-based detergent sheet according to claim 1, characterized in that: The water softener is selected from at least one of sodium citrate, tetrasodium iminodisuccinate, tetrasodium glutamate diacetate, sodium gluconate, and sodium methylglycine diacetate.

8. The long-lasting fragrance flexible porous water-based detergent sheet according to claim 1, characterized in that: The antibacterial and anti-mite agent includes dichlorobenzyl alcohol, cymene, Sichuan pepper extract, phenoxyethanol, 1,2-benzisothiazolin-3-one, diclofenac, silver citrate, and 2,4-dichlorobenzyl alcohol. At least one of benzyl alcohol.

9. A method for preparing a long-lasting fragrance-retaining flexible porous water-based detergent sheet as described in any one of claims 1-8, characterized in that: Includes the following steps: S1, heat the solvent water and mix it with modified cellulose, nonionic surfactant, water softener and anionic surfactant, stir and dissolve until homogeneous to obtain a mixture; add microbial polysaccharide, antibacterial and anti-mite agent, antioxidant and fragrance to the mixture, and add or not add liquid enzyme preparation as needed, stir to obtain slurry; S2, the obtained slurry is dried and made into tablets, and water-soluble inorganic salts are sprayed on at this stage. Solid enzyme preparations may or may not be added as needed to obtain the long-lasting fragrance flexible porous water-based detergent tablets.

10. The method for preparing a long-lasting fragrance-retaining flexible porous water-based detergent sheet according to claim 9, characterized in that: The temperature of the solvent water is 50-60℃.

Images