PVA-free laundry sheet and preparation method therefor

Abstract

A PVA-free laundry sheet and a preparation method therefor. Raw materials of the laundry sheet comprise by parts by weight: 5-15 parts of cellulose, 10-30 parts of sodium dodecyl sulfate, 5-20 parts of sodium α-olefin sulfonate, 5-20 parts of sodium dioctyl sulfosuccinate, 5-10 parts of cocamidopropyl betaine, 2-10 parts of glycerol, and 0.1-2 parts of a chelating agent. The viscosity of the cellulose is 100-1000 mpa•s. The cellulose having a specific viscosity is used as a binder, and is mixed with a surfactant having specific components to prepare the laundry sheet.

Description

A PVA-free laundry detergent sheet and its preparation method Technical Field

[0001] This invention belongs to the field of detergent technology, specifically relating to a PVA-free laundry sheet and its preparation method. Background Technology

[0002] Laundry detergent sheets are washing products made using ultra-concentrated technology. They are small, lightweight, and easy to carry. Upon contact with water, they quickly decompose and dissolve, releasing small cleaning molecules that can deeply clean stubborn stains on clothes. Currently, commercially available laundry detergent sheets primarily use polyvinyl alcohol as a film-forming agent, mixing anionic surfactants, nonionic surfactants, and amphoteric surfactants, along with ingredients such as starch, silica, and fragrances. While these sheets have strong detergency, their film-forming effect is poor. Chinese invention patent CN106590986A discloses a mild laundry detergent sheet with a fabric-softening effect. This is achieved by adding amino silicone oil, polymeric dimethylsiloxane, ester-based quaternary ammonium salts, amide-based quaternary ammonium salts, or dialkyldimethyl quaternary ammonium salts to the detergent sheet, achieving a two-in-one effect of washing and softening. However, ester-based quaternary ammonium salts, amide-based quaternary ammonium salts, and dialkyldimethyl quaternary ammonium salts have strong cationic properties. They can react chemically with the anionic surfactants in the detergent sheet, leading to a decrease in detergency.

[0003] Chinese invention patent CN107022425A discloses an antibacterial, preservative-preservative, and formaldehyde-removing laundry detergent sheet and its preparation method. The laundry detergent sheet comprises the following components by weight: 5-12 parts of binder, 2-15 parts of tea saponin, 8-13 parts of sodium α-olefin sulfonate, 0.1-0.3 parts of preservative, 12-20 parts of filler, 0.2-0.3 parts of lubricant, 2-3 parts of fabric softener, 5-8 parts of surfactant, 3-8 parts of detergent additive, 0.6-1 part of plant aroma extract, 0.2-0.5 parts of chelating agent, 0.01-1.0 parts of sodium hydroxide, 5-8 parts of propylene glycol methyl ether acetate, and 30-35 parts of deionized water. The binder is one or more of sodium carboxymethyl cellulose, guar gum, cellulose, maltodextrin, sugars, polyethylene glycol, and polyvinyl alcohol in any proportion.

[0004] Chinese invention patent CN117363432A discloses a softening and stain-removing laundry composition, its preparation method, and laundry sheets. The laundry composition comprises the following components by weight percentage: 10%-30% polyvinyl alcohol polymer, 20%-50% anionic surfactant, 3%-10% nonionic surfactant, 5%-10% amphoteric surfactant, 1%-10% fabric softener, 0.2%-1% enzyme, 10%-20% additives, 1%-2% pH adjuster, and the balance being deionized water.

[0005] Although the laundry detergent sheets mentioned above all have excellent cleaning effects, the film-forming agent PVA (polyvinyl alcohol) in the laundry detergent sheets can produce microplastics and nanoplastics during the washing process. These tiny plastics have adverse effects on clothing and skin, and also pollute the environment.

[0006] Therefore, it is necessary to replace the PVA component with the traditional laundry detergent sheet ingredients and develop a product in which the components work together to achieve good forming effect and excellent stain removal and washing effect without using polyvinyl alcohol. Summary of the Invention

[0007] This invention addresses the problems existing in the prior art by providing a PVA-free laundry sheet and its preparation method. It uses cellulose with a viscosity of 100-1000 mPa·s as a binder and mixes it with a surfactant of a specific composition. The resulting laundry sheet has good molding effect, is easy to demold and dry, has high burst strength, and excellent washing effect.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] On one hand, the present invention provides a PVA-free laundry sheet, the raw materials comprising, by weight: 5-15 parts cellulose, 10-30 parts sodium dodecyl sulfate, 5-20 parts sodium α-alkenyl sulfonate, 5-20 parts sodium dioctyl sulfosuccinate, 5-10 parts cocamidopropyl betaine, 2-10 parts glycerin and 0.1-2 parts chelating agent;

[0010] The viscosity of the cellulose is 100-1000 mPa·s.

[0011] Preferably, the viscosity of the cellulose is 200-1000 mPa·s.

[0012] More preferably, the viscosity of the cellulose is 200-600 mPa·s.

[0013] More preferably, the viscosity of the cellulose is 400 mPa·s.

[0014] Preferably, the laundry detergent sheet comprises, by weight, the following raw materials: 8-12 parts cellulose, 15-25 parts sodium dodecyl sulfate, 8-15 parts sodium α-alkenyl sulfonate, 10-18 parts sodium dioctyl sulfosuccinate, 6-9 parts cocamidopropyl betaine, 4-8 parts glycerin, and 0.5-1.5 parts chelating agent.

[0015] More preferably, the laundry detergent sheet comprises, by weight, the following raw materials: 10 parts cellulose, 20 parts sodium dodecyl sulfate, 12 parts sodium α-alkenyl sulfonate, 15 parts sodium dioctyl sulfosuccinate, 8 parts cocamidopropyl betaine, 6 parts glycerin, and 1 part chelating agent.

[0016] Preferably, the chelating agent is tetrasodium glutamate diacetate (GLDA).

[0017] Preferably, the weight ratio of sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium dioctyl sulfosuccinate, and cocamidopropyl betaine is 10-30:5-20:5-20:5-10.

[0018] More preferably, the weight ratio of sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium dioctyl sulfosuccinate, and cocamidopropyl betaine is 15-25:8-15:10-18:6-9.

[0019] More preferably, the weight ratio of sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium dioctyl sulfosuccinate, and cocamidopropyl betaine is 20:12:15:8.

[0020] Preferably, the raw materials of the laundry sheet also include water, with the water content being 50-70 parts by weight; the purpose of including water in the raw materials is to ensure that the various components of the laundry sheet are fully and evenly mixed.

[0021] More preferably, the water is in the form of 55-65 parts by weight.

[0022] More preferably, the water is in the form of 60 parts by weight.

[0023] Preferably, the laundry detergent sheet may further include a fragrance. The fragrance has no effect on the viscosity, molding properties, tensile strength, breaking strength, or detergency of the laundry detergent sheet of the present invention. The fragrance of the present invention can be any fragrance ingredient in this technical field, and the amount of fragrance used is 0.1-2 parts.

[0024] On the other hand, the present invention also provides a method for preparing the above-mentioned laundry sheets, comprising the steps of:

[0025] (1) Sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium dioctyl sulfosuccinate, cocamidopropyl betaine and water are mixed and stirred to homogenize, resulting in a homogeneous mixture;

[0026] (2) Mix the homogenized mixture with cellulose, glycerol and chelating agent, and stir until homogeneous;

[0027] (3) Coating and drying to obtain laundry sheets.

[0028] Preferably, in step (1), the temperature of the stirring and homogenizing is 25-60℃; the temperature of the stirring and homogenizing is further preferably 50-60℃.

[0029] Preferably, in step (1), the time for stirring and homogenizing is 30-60 min.

[0030] More preferably, in step (1), the stirring and homogenization time is 50 min.

[0031] Preferably, in step (2), the stirring time is 10-20 minutes until the mixture is homogeneous.

[0032] More preferably, in step (2), the stirring time is 15 minutes.

[0033] Preferably, in step (3), the coating thickness is 1.5-2 mm.

[0034] More preferably, in step (3), the coating thickness is 1.8 mm.

[0035] Preferably, in step (3), the drying is performed by drying at 100-120°C or freeze-drying until the moisture content is 3%-9%.

[0036] In this invention, the purpose of the stirring and homogenization process in the preparation method is to ensure that the components are mixed evenly.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The laundry sheets of this invention use cellulose with a viscosity of 100-1000 mPa·s as a binder, which has a moderate viscosity. As a carrier of surfactant, cellulose can improve foaming effect. The use of cellulose with suitable viscosity in the preparation of laundry sheets allows the components to work together, making the laundry sheets easy to form and demold without the use of polyvinyl alcohol. The laundry sheets have a high surfactant content, uniform coating, simple drying process, good forming effect, and convenient demolding. The laundry sheets have high burst strength, are not easy to break during demolding, have high tensile strength, and good toughness.

[0039] 2. This invention uses surfactants with specific components to prepare laundry sheets, which can mix the components evenly under normal temperature conditions. This facilitates coating and drying while maintaining the excellent washing effect of the laundry sheets. The surfactant components interact with each other and work synergistically to achieve a strong detergency under gentle washing conditions. Attached Figure Description

[0040] Figure 1 shows the laundry sheet prepared in Example 1 of the present invention.

[0041] Figure 2 shows the laundry sheet prepared in Comparative Example 1 of this invention.

[0042] Figure 3 shows the product prepared in Comparative Example 2 of this invention. Detailed Implementation

[0043] The following non-limiting embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of the present invention, but do not limit the invention in any way. The following content is merely an exemplary description of the scope of protection claimed by the present invention, and those skilled in the art can make various changes and modifications to the present invention based on the disclosed content, and such changes should also fall within the scope of protection claimed by the present invention.

[0044] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0045] The present invention will be further described below by way of specific embodiments. Unless otherwise specified, all chemical reagents used in the embodiments of the present invention are obtained through conventional commercial means.

[0046] In the following examples, the cellulose was purchased from Hebei Qingjun Building Materials Co., Ltd.; the sodium dodecyl sulfate was purchased from Guangzhou Churen Chemical Co., Ltd., branded as Hunan Lichen; the sodium α-alkenyl sulfonate was purchased from Jinan Daorong Chemical Co., Ltd.; the sodium dioctyl sulfosuccinate was purchased from Jiangsu Haian Petrochemical Plant; and the cocamidopropyl betaine was purchased from Guangzhou Xingye Technology Co., Ltd. For the above components, products from different manufacturers did not significantly affect the efficacy.

[0047] Example 1

[0048] A PVA-free laundry sheet contains the following raw materials by weight: 10 parts cellulose, 20 parts sodium lauryl sulfate, 12 parts sodium α-alkenyl sulfonate, 15 parts sodium dioctyl sulfosuccinate, 8 parts cocamidopropyl betaine, 6 parts glycerin, 1 part chelating agent GLDA, and 60 parts water.

[0049] The viscosity of the cellulose is 400 mPa·s.

[0050] The preparation method of this PVA-free laundry detergent sheet is as follows:

[0051] (1) Sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium dioctyl sulfosuccinate, cocamidopropyl betaine and water were mixed and stirred at 50°C for 50 min to obtain a homogeneous mixture.

[0052] (2) Mix the homogenized mixture with cellulose, glycerol and chelating agent, and stir for 15 minutes until homogeneous;

[0053] (3) Coat to a thickness of 1.8 mm, dry at 110±10℃ until the moisture content is 6% to obtain laundry sheets.

[0054] Example 2

[0055] A PVA-free laundry detergent sheet contains the following raw materials by weight: 8 parts cellulose, 15 parts sodium lauryl sulfate, 8 parts sodium α-alkenyl sulfonate, 10 parts sodium dioctyl sulfosuccinate, 6 parts cocamidopropyl betaine, 4 parts glycerin, 0.5 parts chelating agent GLDA, and 55 parts water.

[0056] The viscosity of the cellulose is 400 mPa·s.

[0057] The preparation method of this PVA-free laundry sheet is the same as in Example 1.

[0058] Example 3

[0059] A PVA-free laundry detergent sheet contains the following raw materials by weight: 12 parts cellulose, 25 parts sodium dodecyl sulfate, 15 parts sodium α-alkenyl sulfonate, 18 parts sodium dioctyl sulfosuccinate, 9 parts cocamidopropyl betaine, 8 parts glycerin, 4.5 parts chelating agent GLDA, and 65 parts water.

[0060] The viscosity of the cellulose is 400 mPa·s.

[0061] The preparation method of this PVA-free laundry sheet is the same as in Example 1.

[0062] Example 4

[0063] A PVA-free laundry detergent sheet contains the following raw materials by weight: 5 parts cellulose, 10 parts sodium lauryl sulfate, 5 parts sodium α-alkenyl sulfonate, 5 parts sodium dioctyl sulfosuccinate, 5 parts cocamidopropyl betaine, 2 parts glycerin, 0.1 parts chelating agent GLDA, and 70 parts water.

[0064] The viscosity of the cellulose is 1000 mPa·s.

[0065] The preparation method of this PVA-free laundry sheet is the same as in Example 1.

[0066] Example 5

[0067] A PVA-free laundry sheet contains the following raw materials by weight: 15 parts cellulose, 30 parts sodium dodecyl sulfate, 20 parts sodium α-alkenyl sulfonate, 20 parts sodium dioctyl sulfosuccinate, 10 parts cocamidopropyl betaine, 10 parts glycerin, 2 parts chelating agent GLDA, and 70 parts water.

[0068] The viscosity of the cellulose is 200 mPa·s.

[0069] The preparation method of this PVA-free laundry sheet is the same as in Example 1.

[0070] Example 6

[0071] A PVA-free laundry sheet contains the following raw materials by weight: 10 parts cellulose, 20 parts sodium lauryl sulfate, 12 parts sodium α-alkenyl sulfonate, 15 parts sodium dioctyl sulfosuccinate, 8 parts cocamidopropyl betaine, 6 parts glycerin, 1 part chelating agent GLDA, and 55 parts water.

[0072] The viscosity of the cellulose is 600 mPa·s.

[0073] Everything else is the same as in Example 1.

[0074] Comparative Example 1

[0075] Unlike Example 1, the viscosity of the cellulose is 20,000 mPa·s. Everything else is the same as in Example 1.

[0076] Comparative Example 2

[0077] The difference from Example 1 is that cellulose is replaced with PVA (polyvinyl alcohol). Everything else is the same as in Example 1.

[0078] Comparative Example 3

[0079] The difference from Example 1 is that cellulose was replaced with water-soluble starch (purchased from Shijiazhuang Tangtian Starch Co., Ltd., food-grade water-soluble starch type III). Everything else is the same as in Example 1.

[0080] Comparative Example 4

[0081] The difference from Example 1 is that cellulose was replaced with guar gum (purchased from Guangzhou Dongxiong Chemical Co., Ltd.). Everything else is the same as in Example 1.

[0082] Comparative Example 5

[0083] Unlike Example 1, the weight proportions of each component in the laundry sheet are different, specifically:

[0084] A PVA-free laundry sheet contains the following raw materials by weight: 3 parts cellulose, 20 parts sodium lauryl sulfate, 12 parts sodium α-alkenyl sulfonate, 15 parts sodium dioctyl sulfosuccinate, 8 parts cocamidopropyl betaine, 13 parts glycerin, 1 part chelating agent GLDA, and 42 parts water.

[0085] The viscosity of the cellulose is 400 mPa·s.

[0086] Everything else is the same as in Example 1.

[0087] Comparative Example 6

[0088] Unlike Example 1, the surfactant consists of only two components: sodium dodecyl sulfate and sodium α-alkenyl sulfonate.

[0089] A PVA-free laundry sheet contains the following raw materials by weight: 10 parts cellulose, 20 parts sodium lauryl sulfate, 12 parts sodium α-alkenyl sulfonate, 6 parts glycerin, 1 part chelating agent GLDA, and 42 parts water.

[0090] The viscosity of the cellulose is 400 mPa·s.

[0091] Everything else is the same as in Example 1.

[0092] Comparative Example 7

[0093] Unlike Example 1, the surfactant consists of only two components: sodium dioctyl sulfosuccinate and cocamidopropyl betaine.

[0094] A PVA-free laundry detergent sheet contains the following raw materials by weight: 10 parts cellulose, 15 parts sodium dioctyl sulfosuccinate, 8 parts cocamidopropyl betaine, 6 parts glycerin, 1 part chelating agent GLDA, and 42 parts water.

[0095] The viscosity of the cellulose is 400 mPa·s.

[0096] Everything else is the same as in Example 1.

[0097] Comparative Example 8

[0098] Unlike Example 1, sodium dioctyl sulfosuccinate was replaced with sodium dodecylbenzenesulfonate.

[0099] Everything else is the same as in Example 1.

[0100] Test 1

[0101] 1. Evaluation of molding and demolding effects:

[0102] After drying, the molding ability and demolding ease of the laundry sheets were evaluated. Figure 1 shows the laundry sheet prepared in Example 1, which exhibited good molding performance, easy demolding, and no breakage. The laundry sheets prepared in Examples 2-6 of this invention all demonstrated good molding performance, easy demolding, and no breakage.

[0103] The laundry sheet of Comparative Example 1 is shown in Figure 2; Comparative Example 2 uses high-viscosity cellulose. Due to the excessive viscosity of the mixture system, it is not easy to demold. During the demolding process, the laundry sheet and the mold stick together and cannot be formed into a complete sheet. Therefore, the laundry sheet cannot be successfully prepared, and the tensile strength and solubility cannot be tested.

[0104] The product of Comparative Example 2 could not be formed and could not be called a laundry sheet. The product of Comparative Example 2 is shown in Figure 3. Comparative Example 2 uses PVA. PVA cannot be mixed evenly with other components under room temperature conditions, and therefore cannot act as an adhesive. After coating and drying, it cannot be used to prepare a complete laundry sheet, so it cannot be tested for tensile strength and solubility.

[0105] As can be seen from Figures 1-3, the laundry sheets prepared in the embodiments of the present invention have a uniform coating, are easy to form, and are easy to demold after drying, with no damage to the laundry sheets. The products prepared in Comparative Examples 1 and 2, however, could not be formed into complete sheets, and laundry sheet products could not be successfully obtained.

[0106] In Comparative Examples 3 and 4, after cellulose was replaced with conventionally used adhesive components, the laundry sheets were uneven in shape, difficult to demold, and had weaker toughness and tensile strength.

[0107] Comparative Example 5: Changing the amount of cellulose and glycerin resulted in a decrease in the viscosity of the laundry sheets, making them difficult to shape and demold; the tensile strength of the resulting laundry sheets was significantly reduced.

[0108] 2. Fracture strength test:

[0109] The test was conducted according to the method of GB / T 3923.1-1997, and the technical effects were compared based on the breaking strength. Laundry sheets were cut into strips 5cm wide and 11cm long, clamped with the two jaws of a tensile testing machine, and pulled at a constant speed until they broke. The maximum tensile force at break was recorded in N. The test was repeated three times, and the results of the breaking strength (N) are shown in Table 1.

[0110] 3. Solubility test:

[0111] Cut the prepared laundry detergent sheets into 5cm x 5cm squares, then place them in 300mL of pure water at 15℃ and stir at a constant speed. Measure the time (s, seconds) it takes for the laundry detergent sheets to completely decompose and dissolve. Repeat the test 3 times, and the results of the dissolution time are shown in Table 1.

[0112] Table 1

[0113] In Table 1, *P<0.05 and **P<0.01 indicate that the comparative group and the example group showed statistically significant differences.

[0114] As can be seen from Table 1, the laundry sheets of the present invention have high tensile strength, strong toughness and strong bonding strength, are easy to mold, are easy to demold after molding, and have a good appearance; they also have high solubility and can be completely dissolved within a few seconds.

[0115] Test 2: Stain Removal and Washing Effect Test

[0116] Test method: The test was conducted in accordance with GB / T 13174-2021 Determination of detergency and recycle performance of detergents for clothing, and the standard detergent detergency ratio (p) was used for evaluation.

[0117] JB-01 Carbon Black Oil Stain Cloth, JB-02 Protein Stain Cloth, JB-03 Sebum Stain Cloth.

[0118] The detergency ratio (p) results of the laundry sheets in each embodiment and comparative example, and the same type of standard detergent are shown in Table 2. To compare the detergency of the laundry sheet samples and the standard detergent, the washing solutions of the standard detergent and the sample laundry sheets should be placed under the same conditions, and the same number of the same type of test sheets should be used as a group to conduct the detergency washing test.

[0119] Table 2

[0120] In Table 2, *P<0.05 and **P<0.01 indicate that the comparative group and the example group showed statistically significant differences.

[0121] In Table 2, when the stain removal ratio (p) > 1.0, it indicates that the stain removal ability of the laundry sheet is equal to or better than that of the standard detergent, referred to as "satisfactory stain removal ability for soiled cloth"; when the stain removal ratio (p) < 1.0, it indicates that the stain removal ability of the laundry sheet is inferior to that of the standard detergent, referred to as "unsatisfactory stain removal ability for soiled cloth".

[0122] As can be seen from Table 2, the laundry detergent sheet of the present invention has a significantly better cleaning ability than standard detergents, and the cleaning ability result is "satisfactory". Comparative Example 1 uses cellulose with a viscosity of 20,000 to prepare the laundry detergent sheet. Due to the high viscosity of cellulose, a large amount of water is required, which reduces the concentration of surfactant components and worsens the washing effect. Comparative Example 4 replaces cellulose with guar gum, which reduces the solubility and prevents the surfactant from fully exerting its effect, resulting in a poorer washing effect. Comparative Examples 6 and 7 use only two surfactants, which significantly worsen the washing effect. Even if the cleaning abilities of the two laundry detergent sheets are added together, they still cannot reach the cleaning ability of the present invention. The surfactants of the present invention have a synergistic effect, resulting in a significant improvement in cleaning ability. Comparative Example 8 changes the composition of the surfactants. This laundry detergent sheet does not exert the synergistic effect of the four specific surfactants, and the cleaning ability decreases.

[0123] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A PVA-free laundry sheet, characterized in that, The raw materials, by weight, include: 5-15 parts cellulose, 10-30 parts sodium dodecyl sulfate, 5-20 parts sodium α-alkenyl sulfonate, 5-20 parts sodium dioctyl sulfosuccinate, 5-10 parts cocamidopropyl betaine, 2-10 parts glycerol, and 0.1-2 parts chelating agent. The viscosity of the cellulose is 100-1000 mPa·s.

2. The laundry sheet according to claim 1, characterized in that, The viscosity of the cellulose is 200-1000 mPa·s.

3. The laundry sheet according to claim 2, characterized in that, The viscosity of the cellulose is 200-600 mPa·s.

4. The laundry sheet according to claim 3, characterized in that, The viscosity of the cellulose is 400 mPa·s.

5. The laundry sheet according to any one of claims 1-4, characterized in that, The raw materials, by weight, include: 8-12 parts cellulose, 15-25 parts sodium dodecyl sulfate, 8-15 parts sodium α-alkenyl sulfonate, 10-18 parts sodium dioctyl sulfosuccinate, 6-9 parts cocamidopropyl betaine, 4-8 parts glycerol, and 0.5-1.5 parts chelating agent.

6. The laundry sheet according to claim 5, characterized in that, The raw materials, by weight, include: 10 parts cellulose, 20 parts sodium dodecyl sulfate, 12 parts sodium α-alkenyl sulfonate, 15 parts sodium dioctyl sulfosuccinate, 8 parts cocamidopropyl betaine, 6 parts glycerol, and 1 part chelating agent.

7. The laundry sheet according to any one of claims 1-4, characterized in that, The chelating agent is tetrasodium glutamate diacetate.

8. The laundry sheet according to claim 1, characterized in that, The weight ratio of sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium dioctyl sulfosuccinate, and cocamidopropyl betaine is 15-25:8-15:10-18:6-9. The raw materials of the laundry sheets also include water, with the water content being 50-70 parts by weight.

9. The method for preparing the laundry detergent sheet according to any one of claims 1-8, characterized in that, Including the following steps: (1) Sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium dioctyl sulfosuccinate, cocamidopropyl betaine and water are mixed and stirred to homogenize, resulting in a homogeneous mixture; (2) Mix the homogenized mixture with cellulose, glycerol and chelating agent, and stir until homogeneous; (3) Coating and drying to obtain laundry sheets.

10. The preparation method according to claim 9, characterized in that, In step (1), the temperature for stirring and homogenizing is 25-60℃, and the time for stirring and homogenizing is 30-60 min; In step (2), the stirring time is 10-20 minutes, until the mixture is homogeneous; In step (3), the coating thickness is 1.5-2 mm; the drying is: drying at 100-120℃ or freeze drying.

Images