PVA-free laundry sheet and preparation method thereof

Abstract

The invention provides a PVA-free laundry sheet and a preparation method thereof, and relates to the technical field of detergents. The laundry sheet disclosed by the invention is prepared from the following raw materials in parts by weight: 5 to 15 parts of cellulose, 10 to 30 parts of sodium dodecyl sulfate, 5 to 20 parts of sodium alpha-olefin sulfonate, 5 to 20 parts of sodium dioctyl sulfosuccinate, 5 to 10 parts of cocamidopropyl betaine, 2 to 10 parts of glycerol and 0.1 to 2 parts of chelating agent, the viscosity of the cellulose ranges from 100 mpa * s to 1000 mpa * s. Cellulose with specific viscosity is used as an adhesive and is mixed with a surfactant with specific components, and the prepared laundry sheet is good in forming effect, easy to demould and dry, high in breaking strength and excellent in washing effect.

Description

Technical Field

[0001] The invention belongs to the technical field of detergents, and in particular relates to a PVA-free laundry tablet and a preparation method thereof. Background Art

[0002] Laundry tablets are a washing product prepared by super-concentration technology. The size of the laundry tablets is small, the weight is light, and it is easy to carry. The laundry tablets can be quickly decomposed and dissolved after contacting water, releasing clean small molecules, and can deeply clean stubborn stains deposited on clothes. Currently, commercially available laundry tablets are basically based on polyvinyl alcohol as a film-forming agent, anionic surfactants, nonionic surfactants, and amphoteric surfactants are mixed, and ingredients such as starch, silicon dioxide, and flavors are added. Although these laundry tablets have strong detergency, the molding effect is poor. Chinese invention patent CN106590986A discloses a mild laundry tablet with a clothing softening effect, which achieves a two-in-one effect of laundry softening by adding amino silicone oil, polymerized dimethyl siloxane, ester quaternary ammonium salt, amide quaternary ammonium salt or dialkyl dimethyl quaternary ammonium salt to the laundry tablet. However, ester quaternary ammonium salt, amide quaternary ammonium salt, and dialkyl dimethyl quaternary ammonium salt have strong cationic properties, and they will react chemically with the anionic surfactant in the laundry tablet, resulting in a decrease in detergency.

[0003] Chinese invention patent CN107022425A discloses an antibacterial, antiseptic and formaldehyde-removing laundry tablet and a preparation method thereof. The laundry tablet comprises the following components by weight: 5-12 parts of adhesive, 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 aid, 0.6-1 parts of plant aromatherapy 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 adhesive is a mixture of one or more of sodium carboxymethyl cellulose, guar gum, cellulose, maltodextrin, sugar, polyethylene glycol and polyvinyl alcohol in any proportion.

[0004] Chinese invention patent CN117363432A discloses a soft and decontamination-type laundry composition, a preparation method and a laundry tablet, wherein the laundry composition comprises the following components in weight percentage: 10%-30% of polyvinyl alcohol polymer, 20%-50% of anionic surfactant, 3%-10% of nonionic surfactant, 5%-10% of amphoteric surfactant, 1%-10% of softener, 0.2%-1% of enzyme, 10%-20% of auxiliary agent, 1%-2% of pH regulator, and the balance is deionized water.

[0005] Although the above-mentioned laundry tablets all have good cleaning effects, the film-forming agent PVA (polyvinyl alcohol) in the laundry tablets will produce microplastics and nanoplastics during the washing process. These tiny plastics have adverse effects on clothes and skin, and pollute the environment.

[0006] In view of this, it is necessary to replace the PVA component on the basis of the ingredients of traditional laundry tablets, and develop a method in which the ingredients cooperate with each other, so that the laundry tablets have good molding effect, excellent decontamination and washing effect without using polyvinyl alcohol. Summary of the invention

[0007] The present invention aims at solving the problems in the prior art and provides a PVA-free laundry tablet and a preparation method thereof. Cellulose with a viscosity of 100-1000 mPa·s is used as a binder and mixed with a surfactant of a specific component. The prepared laundry tablet has good molding effect, is easy to demould and dry, has high rupture strength and excellent washing effect.

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

[0009] In one aspect, the present invention provides a PVA-free laundry tablet, wherein the raw materials include, by weight: 5-15 parts of cellulose, 10-30 parts of sodium lauryl 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;

[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 tablet comprises, by weight, 8-12 parts of cellulose, 15-25 parts of sodium lauryl sulfate, 8-15 parts of sodium α-olefin sulfonate, 10-18 parts of sodium dioctyl sulfosuccinate, 6-9 parts of cocamidopropyl betaine, 4-8 parts of glycerol and 0.5-1.5 parts of chelating agent.

[0015] Further preferably, the laundry tablet comprises, by weight, 10 parts of cellulose, 20 parts of sodium lauryl sulfate, 12 parts of sodium α-olefin sulfonate, 15 parts of sodium dioctyl sulfosuccinate, 8 parts of cocamidopropyl betaine, 6 parts of glycerol and 1 part of chelating agent.

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

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

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

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

[0020] Preferably, the raw material of the laundry tablet also includes water, and the weight portion of water is 50-70 parts; the purpose of including water in the raw material is to fully mix the various components of the laundry tablet.

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

[0022] More preferably, the weight portion of water is 60 parts.

[0023] Preferably, the components of the laundry tablet may also include fragrance, which has no effect on the viscosity, molding performance, tensile strength, breaking strength, decontamination and washing ability of the laundry tablet of the present invention. The fragrance of the present invention may be any fragrance component in the 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 tablet, comprising the steps of:

[0025] (1) mixing sodium lauryl sulfate, sodium α-olefin sulfonate, sodium dioctyl sulfosuccinate, cocamidopropyl betaine and water, stirring and homogenizing to obtain a homogeneous mixture;

[0026] (2) mixing the homogenous mixture with cellulose, glycerin, and chelating agent and stirring evenly;

[0027] (3) Apply and dry to obtain a laundry sheet.

[0028] Preferably, in step (1), the stirring and homogenizing temperature is 25-60°C; and the stirring and homogenizing temperature is more preferably 50-60°C.

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

[0030] Further preferably, in step (1), the stirring and homogenizing time is 50 minutes.

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

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

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

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

[0035] Preferably, in step (3), the drying is: drying at 100-120° C., or freeze drying; drying to a moisture content of 3%-9%.

[0036] In the present invention, the purpose of the stirring and homogenizing treatment in the preparation method is to mix the components uniformly.

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

[0038] 1. The laundry tablet of the present invention uses cellulose with a viscosity of 100-1000 mPa·s as a binder, and has a moderate viscosity. Cellulose can be used as a carrier of a surfactant to improve the foaming effect. The cellulose with a suitable viscosity is used to prepare the laundry tablet, and the various components cooperate with each other, so that the laundry tablet is easy to form and demold without using polyvinyl alcohol. The laundry tablet has a high surfactant content, uniform coating, simple drying process, good molding effect, and convenient demolding. The laundry tablet has high rupture strength, is not easy to break during demolding, has high tensile strength, and good toughness.

[0039] 2. The present invention uses surfactants of specific ingredients to prepare laundry tablets, which can make the ingredients evenly mixed under normal temperature conditions, which is beneficial to coating and drying while maintaining the excellent washing effect of the laundry tablets; the surfactant ingredients interact with each other and synergistically enhance the effect, and have a strong decontamination ability under mild washing conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is the laundry tablet prepared in Example 1 of the present invention.

[0041] Figure 2 This is the laundry tablet prepared in Comparative Example 1 of the present invention.

[0042] Figure 3 This is the product prepared in Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0043] The following non-limiting examples can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. The following content is merely an exemplary description of the scope of the present invention, and those skilled in the art can make various changes and modifications to the present invention based on the disclosed content, which should also fall within the scope of the present invention.

[0044] When the embodiments give numerical ranges, it should be understood that, unless otherwise specified in the present invention, both endpoints of each numerical range and any numerical value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those generally understood by those of ordinary skill in the art to which the present invention belongs.

[0045] The present invention is further described below by way of specific examples. Unless otherwise specified, the various chemical reagents used in the examples of the present invention are obtained through conventional commercial channels.

[0046] In the following examples, the cellulose was purchased from Hebei Qingjun Building Materials Co., Ltd.; the sodium lauryl sulfate was purchased from Guangzhou Churen Chemical Co., Ltd., with the brand Hunan Lichen; the sodium α-olefin sulfonate was purchased from Jinan Daorong Chemical Co., Ltd.; the sodium salt of dioctyl sulfonated succinate was purchased from Jiangsu Hai'an Petrochemical Plant; and the cocamidopropyl betaine was purchased from Guangzhou Xingye Technology Co., Ltd. The above components, products from different manufacturers have no significant effect on the effect.

[0047] Example 1

[0048] A PVA-free laundry tablet, comprising the following raw materials by weight: 10 parts of cellulose, 20 parts of sodium lauryl sulfate, 12 parts of sodium α-olefin sulfonate, 15 parts of sodium dioctyl sulfosuccinate, 8 parts of cocamidopropyl betaine, 6 parts of glycerol, 1 part of chelating agent GLDA and 60 parts of water;

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

[0050] The preparation method of the PVA-free laundry tablet is as follows:

[0051] (1) sodium lauryl sulfate, sodium α-olefin sulfonate, sodium dioctyl sulfosuccinate, cocamidopropyl betaine and water are mixed and stirred at 50° C. for 50 minutes to obtain a homogeneous mixture;

[0052] (2) mixing the homogenous mixture with cellulose, glycerol, and chelating agent, and stirring for 15 minutes until uniform;

[0053] (3) Apply the coating to a thickness of 1.8 mm, and dry at 110±10° C. to a moisture content of 6% to obtain a laundry tablet.

[0054] Example 2

[0055] A PVA-free laundry tablet, comprising the following raw materials by weight: 8 parts of cellulose, 15 parts of sodium lauryl sulfate, 8 parts of sodium α-olefin sulfonate, 10 parts of sodium dioctyl sulfosuccinate, 6 parts of cocamidopropyl betaine, 4 parts of glycerol, 0.5 parts of chelating agent GLDA and 55 parts of water;

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

[0057] The preparation method of the PVA-free laundry tablet is the same as that of Example 1.

[0058] Example 3

[0059] A PVA-free laundry tablet, comprising the following raw materials by weight: 12 parts of cellulose, 25 parts of sodium lauryl sulfate, 15 parts of sodium α-olefin sulfonate, 18 parts of sodium dioctyl sulfosuccinate, 9 parts of cocamidopropyl betaine, 8 parts of glycerol, 4.5 parts of chelating agent GLDA and 65 parts of water;

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

[0061] The preparation method of the PVA-free laundry tablet is the same as that of Example 1.

[0062] Example 4

[0063] A PVA-free laundry tablet, comprising the following raw materials by weight: 5 parts of cellulose, 10 parts of sodium lauryl sulfate, 5 parts of sodium α-olefin sulfonate, 5 parts of sodium dioctyl sulfosuccinate, 5 parts of cocamidopropyl betaine, 2 parts of glycerol, 0.1 parts of chelating agent GLDA and 70 parts of water;

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

[0065] The preparation method of the PVA-free laundry tablet is the same as that of Example 1.

[0066] Example 5

[0067] A PVA-free laundry tablet, comprising the following raw materials by weight: 15 parts of cellulose, 30 parts of sodium lauryl sulfate, 20 parts of sodium α-olefin sulfonate, 20 parts of sodium dioctyl sulfosuccinate, 10 parts of cocamidopropyl betaine, 10 parts of glycerol, 2 parts of chelating agent GLDA and 70 parts of water;

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

[0069] The preparation method of the PVA-free laundry tablet is the same as that of Example 1.

[0070] Example 6

[0071] A PVA-free laundry tablet, comprising the following raw materials by weight: 10 parts of cellulose, 20 parts of sodium lauryl sulfate, 12 parts of sodium α-olefin sulfonate, 15 parts of sodium dioctyl sulfosuccinate, 8 parts of cocamidopropyl betaine, 6 parts of glycerol, 1 part of chelating agent GLDA and 55 parts of water;

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

[0073] The rest are the same as in Example 1.

[0074] Comparative Example 1

[0075] The difference from Example 1 is that the viscosity of cellulose is 20000 mPa·s. The rest is the same as Example 1.

[0076] Comparative Example 2

[0077] The difference from Example 1 is that cellulose is replaced by PVA (polyvinyl alcohol). The rest is the same as Example 1.

[0078] Comparative Example 3

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

[0080] Comparative Example 4

[0081] The difference from Example 1 is that cellulose is replaced by guar gum (purchased from Guangzhou Dongxiong Chemical Co., Ltd.). The rest is the same as Example 1.

[0082] Comparative Example 5

[0083] The difference from Example 1 is that the weight percentages of the components in the laundry tablet are different, specifically:

[0084] A PVA-free laundry tablet, comprising the following raw materials by weight: 3 parts of cellulose, 20 parts of sodium lauryl sulfate, 12 parts of sodium α-olefin sulfonate, 15 parts of sodium dioctyl sulfosuccinate, 8 parts of cocamidopropyl betaine, 13 parts of glycerol, 1 part of chelating agent GLDA and 42 parts of water;

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

[0086] The rest are the same as in Example 1.

[0087] Comparative Example 6

[0088] The difference from Example 1 is that the surfactant is only composed of two components: sodium lauryl sulfate and sodium α-olefin sulfonate.

[0089] A PVA-free laundry tablet, comprising the following raw materials by weight: 10 parts of cellulose, 20 parts of sodium lauryl sulfate, 12 parts of sodium α-olefin sulfonate, 6 parts of glycerol, 1 part of chelating agent GLDA and 42 parts of water;

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

[0091] The rest are the same as in Example 1.

[0092] Comparative Example 7

[0093] The difference from Example 1 is that the surfactant is only two components: sodium salt of dioctyl sulfonate succinate and cocamidopropyl betaine.

[0094] A PVA-free laundry tablet, comprising the following raw materials by weight: 10 parts of cellulose, 15 parts of sodium dioctyl sulfosuccinate, 8 parts of cocamidopropyl betaine, 6 parts of glycerol, 1 part of chelating agent GLDA and 42 parts of water;

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

[0096] The rest are the same as in Example 1.

[0097] Comparative Example 8

[0098] The difference from Example 1 is that the sodium salt of dioctyl sulfosuccinate is replaced by sodium dodecylbenzenesulfonate.

[0099] The rest are the same as in Example 1.

[0100] Detection test 1

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

[0102] After drying, the tablets were evaluated for molding ability and demoulding difficulty. Figure 1 The laundry tablet prepared in Example 1 has good molding effect, is easy to demould, and has no damage. The laundry tablets prepared in Examples 2 to 6 of the present invention all have good molding effect, are easy to demould, and have no damage.

[0103] The laundry tablet of comparative example 1 is shown in Figure 2 Comparative Example 2 uses high-viscosity cellulose. Since the mixture system is too viscous and difficult to demold, the laundry tablet and the mold are adhered during the demolding process and cannot be fully formed into a sheet. The laundry tablet cannot be successfully prepared, and thus the breaking strength and solubility tests cannot be performed.

[0104] The product of Comparative Example 2 cannot be formed and cannot be called a laundry tablet. Figure 3Comparative Example 2 uses PVA, which cannot be evenly mixed with other ingredients at room temperature and thus cannot function as an adhesive. After coating and drying, a complete laundry sheet cannot be prepared, and thus the breaking strength and solubility tests cannot be performed.

[0105] from Figure 1-Figure 3 It can be seen that the laundry tablet prepared in the embodiment of the present invention is evenly coated, easy to shape, easy to demould after drying, and the laundry tablet is not damaged. The products prepared in Comparative Examples 1 and 2 cannot be completely formed into tablets, and laundry tablet products cannot be successfully obtained.

[0106] After the cellulose was replaced with the conventional adhesive components in Comparative Examples 3 and 4, the laundry tablets had uneven shapes, were difficult to demould, and had weak toughness and breaking strength.

[0107] In Comparative Example 5, the dosage of cellulose and glycerol components was changed, resulting in a decrease in viscosity of the laundry tablet, making it difficult to form and demould; and the breaking strength of the obtained laundry tablet was significantly reduced.

[0108] 2. Breaking strength test:

[0109] The test was conducted according to the method of GB / T 3923.1-1997, and the technical effects were compared by breaking strength. The laundry tablets were cut into strips of 5 cm wide and 11 cm long, and clamped with two clamps of the stretching machine. The laundry tablets were pulled at a constant speed until they broke, and the maximum tensile force of the laundry tablets when they were broken was recorded in N. The test was repeated 3 times, and the test results of breaking strength (N) are shown in Table 1.

[0110] 3. Solubility performance test:

[0111] The prepared laundry tablets were cut into 5 cm × 5 cm square pieces, and then placed in 300 mL of 15°C pure water and stirred at a constant speed. The time (s, seconds) taken for the laundry tablets to completely decompose and dissolve was measured. The test was repeated 3 times, and the test results of the dissolution time are shown in Table 1.

[0112] Table 1

[0113] Breaking strength(N) Dissolution time(s) Example 1 12.52±1.08 10.5±1.98 Example 2 12.49±1.15 10.8±2.05 Example 3 12.41±0.97 10.0±2.13 Example 4 13.34±1.21 12.1±1.85 Example 5 11.97±1.30 9.9±2.54 Example 6 12.88±0.84 11.6±2.36 Comparative Example 3 5.10±0.36* 17.9±2.68 Comparative Example 4 4.38±0.37* 60.5±4.52** Comparative Example 5 3.92±0.61* 9.4±1.59

[0114] In Table 1, *P<0.05, **P<0.01, there is a statistically significant difference between the comparative example group and the example group.

[0115] As can be seen from Table 1, the laundry tablet of the present invention has high breaking strength, strong toughness and strong bonding strength, is easy to shape, easy to demould after shaping, and has a good appearance; it has high solubility and can be completely dissolved within a dozen seconds.

[0116] Test 2: Decontamination and washing effect test

[0117] Testing method: The test is carried out in accordance with GB / T 13174-2021 Detergents for Clothing - Detergent Power and Washing Cycle Performance Detergents for Clothing, and the standard detergent detergency ratio (p) is used for evaluation.

[0118] JB-01 carbon black oil stain cloth, JB-02 protein stain cloth, JB-03 sebum stain cloth.

[0119] The results of the decontamination ratio (p) of the laundry tablets of various embodiments and comparative examples and similar standard detergents are shown in Table 2. To compare the decontamination power of the laundry tablet samples and the standard detergent, the washing solutions of the standard detergent and the sample laundry tablet samples should be placed under the same conditions, and the same number of the same test pieces should be used as a group for decontamination washing tests.

[0120] Table 2

[0121] JB-01 JB-02 JB-03 Example 1 1.35±0.12 1.56±0.10 1.42±0.15 Example 2 1.31±0.17 1.50±0.25 1.38±0.18 Example 3 1.33±0.20 1.52±0.24 1.39±0.23 Example 4 1.22±0.15 1.40±0.18 1.30±0.17 Example 5 1.32±0.16 1.49±0.19 1.35±0.10 Example 6 1.25±0.11 1.45±0.11 1.36±0.07 Comparative Example 1 0.83±0.19* 0.95±0.12* 0.90±0.05* Comparative Example 4 1.03±0.25* 1.22±0.13* 1.12±0.15* Comparative Example 6 0.62±0.14** 0.74±0.09** 0.66±0.04** Comparative Example 7 0.45±0.10** 0.55±0.08** 0.48±0.03** Comparative Example 8 1.02±0.09* 1.16±0.07* 1.09±0.13* Standard detergent 1.00 1.00 1.00

[0122] In Table 2, *P<0.05, **P<0.01, there is a statistically significant difference between the comparative example group and the example group.

[0123] In Table 2, when the stain removal ratio (p)>1.0, it indicates that the stain removal ability of the laundry tablet is equivalent to or better than that of the standard detergent, which is referred to as "satisfactory stain removal ability for dirty cloth"; when the stain removal ratio (p)<1.0, it indicates that the stain removal ability of the laundry tablet is worse than that of the standard detergent, which is referred to as "unsatisfactory stain removal ability for dirty cloth".

[0124] As can be seen from Table 2, the laundry tablets of the present invention have significantly better decontamination and washing ability than standard detergents, and the decontamination ability result is "satisfactory". Comparative Example 1 uses cellulose with a viscosity of 20,000 to prepare laundry tablets. Due to the high viscosity of cellulose, a large amount of water is required, which reduces the concentration of surfactant components and deteriorates the washing effect; Comparative Example 4 replaces cellulose with guar gum, and the solubility is poor, and the surfactant cannot fully play its role, resulting in poor washing effect; Comparative Examples 6 and 7 only use two surfactants, and the washing effect brought about by them is significantly worse. Even if the decontamination ability of the two laundry tablets is added together, it still cannot reach the decontamination ability of the present invention. The surfactants of the present invention synergize with each other, which brings about a significant improvement in decontamination ability; Comparative Example 8 changes the components of the surfactants, and the laundry tablet does not play the synergistic effect of the four specific surfactants, and the decontamination ability decreases.

[0125] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A PVA-free laundry tablet, characterized in that: The raw materials include, by weight: 5-15 parts of cellulose, 10-30 parts of sodium lauryl 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 chelating agent; The viscosity of the cellulose is 100-1000 mpa·s.

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

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

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

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

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

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

8. The laundry tablet according to claim 1, characterized in that: The weight ratio of the sodium lauryl sulfate, sodium α-olefin sulfonate, sodium dioctyl sulfosuccinate and cocamidopropyl betaine is 15-25:8-15:10-18:6-9; The raw materials of the laundry tablet also include water, and the weight proportion of the water is 50-70 parts.

9. The method for preparing the laundry tablet according to any one of claims 1 to 8, characterized in that: Includes steps: (1) mixing sodium lauryl sulfate, sodium α-olefin sulfonate, sodium dioctyl sulfosuccinate, cocamidopropyl betaine and water, stirring and homogenizing to obtain a homogeneous mixture; (2) mixing the homogenous mixture with cellulose, glycerin, and chelating agent and stirring evenly; (3) Apply and dry to obtain a laundry sheet.

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

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