Laundry sheet free of SLS surfactant, and preparation method therefor

Abstract

The present application relates to a laundry sheet free of an SLS surfactant, and a preparation method therefor. The laundry sheet free of an SLS surfactant comprises a film-forming agent, an anionic surfactant, a nonionic surfactant, a chelating agent, an enzyme preparation, an auxiliary agent and an essence, wherein the film-forming agent comprises polyvinyl alcohol and one or more of cellulose and starch sodium dodecenyl succinate; the anionic surfactant comprises at least two of sodium α-olefin sulfonate, sodium fatty acid methyl ester sulfonate and sodium isethionate; and the nonionic surfactant comprises at least two of fatty alcohol polyoxyethylene ether, a fatty acid methyl ester ethoxylate, an oil ethoxylate, etc. In the present application, SLS is omitted, thereby reducing irritation to the skin; moreover, specific choices are made to compensate for the influence of the omission of SLS on the preparation of a laundry sheet, thereby obtaining a laundry sheet having a good decontamination effect, a fast dissolution speed, good moisture resistance and dryness resistance, and high stability.

Description

A laundry tablet without SLS surfactant and a preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the field of tablet-shaped washing products, and more particularly to a laundry tablet without SLS surfactant and a preparation method thereof. BACKGROUND

[0002] With the increasing demand for a better life and growing concern for environmental protection, people not only pay attention to the performance of products, but also pay more attention to product safety.

[0003] Sodium alkyl sulfate, also known as "sodium fatty alcohol sulfate", represented by sodium dodecyl sulfate (SLS), is the most widely used surfactant in liquid and solid cleaning products. As an anionic surfactant, SLS has strong penetration and dispersion properties, making it have strong cleaning power. At the same time, SLS has good emulsifying, foaming and foaming properties, and is the most commonly used and large amount of anionic surfactant in cleaning products, and is also an important component that determines the forming and moisture and dry stability of the washing tablet.

[0004] However, SLS is a typical skin chemical irritant with strong penetration and irritation, and has strong degreasing power, which may cause skin irritation damage, cause skin rash, skin itching and redness, and other allergic reactions. In addition, excessive inhalation of SLS may cause irritation to the respiratory tract. Long-term contact with products containing SLS can pose certain hazards to consumers and production workers. In addition, although SLS has good biodegradability, the newly discharged and undegraded SLS entering the aquatic ecosystem can cause acute damage to bacteria, microalgae, crustaceans and fish.

[0005] In the skin irritation test (OECD TG439), 5% SLS is used as a positive control to judge whether the test substance has irritation. At present, the addition amount of SLS in the washing tablet is much more than 5%. For example, in the prior art, the SLS addition amount of the laundry tablet in patent CN112041418A is 20-36%; the SLS addition amount of the anti-staining laundry tablet in patent CN110042004A is 35%; the SLS addition amount of the fragrance type laundry tablet in patent CN115651778A is 13-20%; and the SLS addition amount of the laundry tablet in patent CN106867710A is 20-30%.

[0006] It can be seen that SLS is used in a large amount in the washing tablet, and has a great influence on the forming and moisture and dry stability of the washing tablet, but long-term contact has certain irritation to the skin, respiratory tract, etc.

[0007] In addition, since the solid detergent product such as the washing tablet / block does not need to be dosed by a measuring device when used, and is directly put into use in the form of a single tablet / block, the product has certain requirements for the gram weight and the detergency, especially the tablet-shaped detergent. The tablet-shaped detergent is convenient to use, and has a light weight. In order to have better detergency, an enzyme preparation composition is usually added to achieve strong cleaning. The enzyme preparation can effectively decompose stubborn macromolecular stains such as milk stains, sweat stains and meal stains into small molecule water-soluble substances, and has the advantages of mildness, safety and specific decomposition of stains, and can enhance the detergency of the washing product.

[0008] However, SLS has a great influence on the enzyme activity. In the production process, the enzyme activity is destroyed by SLS. In addition, the shelf life of the washing product is long, and with the increase of the storage time, the surfactant in the washing product will gradually destroy the spatial conformation of the enzyme, causing the enzyme activity to decrease, and further affecting the detergency of the washing product.

[0009] SUMMARY

[0010] Omitting SLS has a great influence on the forming and wet and dry stability of the washing tablet, and using SLS will make the enzyme unable to fully exert the cleaning effect.

[0011] In order to solve the above problems, the present application provides a washing tablet without SLS surfactant and a preparation method thereof.

[0012] In a first aspect, the present application provides a washing tablet without SLS surfactant, which adopts the following technical solution:

[0013] A washing tablet without SLS surfactant is prepared by drying a slurry; according to the weight percentage, the slurry comprises the following raw materials: 10%-40% film-forming agent, 15%-40% anionic surfactant, 2%-12% nonionic surfactant, 0.5%-5% chelating agent, 0.4%-4% enzyme preparation, 0.5%-5% auxiliary agent, 0.1%-1% essence, and water;

[0014] The film-forming agent comprises film-forming agent A and film-forming agent B, the film-forming agent A is polyvinyl alcohol, and the film-forming agent B comprises at least one of cellulose and dodecenyl succinate starch; the weight ratio of the film-forming agent A to the film-forming agent B is (2-15): 1;

[0015] The anionic surfactant comprises at least two of sodium alpha-alkenyl sulfonate, sodium fatty acid methyl ester sulfonate and sodium hydroxyethyl sulfonate;

[0016] The nonionic surfactant comprises at least two of fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate, oil ethoxylate, EO / PO block polyether, plant saponin, alkyl glycoside and alcohol ether glycoside;

[0017] The chelating agent includes at least one of gluconic acid and its salt, glutamic acid diacetic acid and its salt, methyl glycine diacetic acid and its salt, aspartic acid diacetic acid and its salt.

[0018] In the technical solution provided in the application, SLS is omitted, and a specific type of anionic surfactant, nonionic surfactant and film forming agent are selected to cooperate together to make up for the influence on the sheet-shaped detergent due to the omission of SLS. Not only can the sheet-shaped detergent be obtained, but also good moisture resistance and dry resistance can be given to the sheet-shaped detergent, and the laundry tablet has a fast dissolution speed in water.

[0019] After SLS is omitted, the decontamination ability of the enzyme preparation is no longer suppressed, and the special system of the specific type of anionic surfactant, nonionic surfactant and film forming agent also provides a good foundation for the decontamination of the enzyme preparation. Moreover, the enzyme preparation can still play a significant decontamination role under long-term storage of the laundry tablet.

[0020] Specifically, under the special system, the sodium alpha-alkyl sulfonate, sodium fatty acid methyl ester sulfonate and sodium hydroxyethyl sulfonate can be adsorbed on the surface of the enzyme molecules to form a protective film, so as to prevent the enzyme molecules from being attacked by harmful substances in the external environment, thereby protecting the integrity and activity of the enzyme molecules, improving the catalytic efficiency of the enzyme, and further improving the decontamination ability of the washing product. The specially selected nonionic surfactant has a weak effect on the central charge of the enzyme site and a small effect on the enzyme activity in the special system, so as to further ensure the activity and integrity of the enzyme preparation.

[0021] Especially, the plant saponin, alkyl glycoside and alcohol ether glycoside as a new type of green surfactant can significantly reduce the surface tension of the detergent and improve the decontamination effect, and have good foam stability and permeability.

[0022] The application further limits the type of chelating agent used in the special system. The organic acid / salt structure contains hydroxyl, carboxyl and carboxyl, and has good chelating ability for various metal ions, which helps to remove metal ions in water, prevent deposition and the like. In addition, the metal has a certain corrosion inhibition effect, which protects the production equipment, washing machine and metal water pipe during production and use.

[0023] Preferably, the film forming agent is film forming agent A and film forming agent B, the film forming agent A is polyvinyl alcohol, and the film forming agent B is cellulose.

[0024] Preferably, the cellulose is at least one of modified hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose.

[0025] By adopting the technical scheme, the hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose and dodecenyl succinate starch have the advantages of acid-base stability, biodegradability and salt precipitation resistance, and the viscosity of the slurry can be improved by blending with polyvinyl alcohol, and the moisture resistance during storage can be enhanced.

[0026] The anionic surfactant is sodium alpha-alkenyl sulfonate and sodium fatty acid methyl ester sulfonate.

[0027] Preferably, according to the weight percentage of the slurry, the polyvinyl alcohol is 10-26%, the cellulose is 1-5%, the sodium alpha-alkenyl sulfonate is 15-25%, and the sodium fatty acid methyl ester sulfonate is 5-15%.

[0028] Preferably, the non-ionic surfactant is at least two of fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate and oil ethoxylate.

[0029] Preferably, according to the weight percentage of the slurry, the fatty alcohol polyoxyethylene ether is 1-5%.

[0030] Preferably, according to the weight percentage of the slurry, the oil ethoxylate is 1-5%.

[0031] Preferably, according to the weight percentage of the slurry, the fatty acid methyl ester ethoxylate is 1-5%.

[0032] Preferably, the non-ionic surfactant is oil ethoxylate and alkyl glycoside.

[0033] Preferably, according to the weight percentage of the slurry, the oil ethoxylate is 1-5% and the alkyl glycoside is 0.1-2%.

[0034] Preferably, the non-ionic surfactant is fatty acid methyl ester ethoxylate and plant saponin.

[0035] Preferably, according to the weight percentage of the slurry, the fatty acid methyl ester ethoxylate is 3-7% and the plant saponin is 0.1-3%.

[0036] By adopting the technical scheme, the selection and dosage of the anionic surfactant are further limited, the combination and dosage of the non-ionic surfactant are further limited, the non-ionic surfactant, the anionic surfactant, the film-forming agent and the enzyme preparation have better matching effect, the influence caused by omitting SLS can be compensated, and the stain removal, moisture resistance and dry resistance of the laundry tablet can be enhanced.

[0037] It is worth mentioning that the sodium alpha-olefin sulfonate, sodium fatty acid methyl ester sulfonate is a kind of high foam, hydrolysis stability, strong anti-hard water ability of anionic surfactant, under the further limitation of the application, can more fully improve the pH value and ionic strength of the washing environment, create a more suitable environment for enzyme preparation.

[0038] Preferably, the slurry further comprises 0-25% of a filler.

[0039] Preferably, the filler comprises at least one of corn starch, pea starch, tapioca starch, zeolite, bentonite, kaolin, sodium sulfate, sodium carbonate, sodium bicarbonate.

[0040] When the amount of surfactant is low, the filler can be used to assist the molding; and the filler also has the function of assisting washing. Among them, zeolite, bentonite, kaolin are natural "chelating agents", which have layered or porous structure, and can capture and fix metal ions such as calcium and magnesium in water through electrostatic adsorption or ion exchange. In addition, they have large specific surface area, which can adsorb oil stains and other stains, and can prevent stains from redepositing on the fabric.

[0041] Preferably, the enzyme preparation comprises at least two of cellulase, protease, amylase, lipase, pectinase, mannanase, phosphodiesterase.

[0042] Preferably, the auxiliary agent comprises at least one of glycerol, propylene glycol, glucose alcohol.

[0043] In the second aspect, the application provides a preparation method of laundry tablets without SLS surfactant, which adopts the following technical scheme:

[0044] A preparation method of laundry tablets without SLS surfactant, comprising the following steps:

[0045] Step 1: mix the film-forming agent A with water at 75-85℃ until the material is fully swelled and dissolved;

[0046] Step 2: add film-forming agent B and continue stirring until fully dissolved;

[0047] Step 3: add chelating agent, anionic surfactant, non-ionic surfactant, and dissolve for 15-60min;

[0048] Step 4: add the remaining raw materials at 40-45℃ to obtain a slurry;

[0049] Step 5: dry the slurry, shape and make tablets to obtain laundry tablets without SLS surfactant.

[0050] In summary, the application has the following beneficial effects:

[0051] 1. The present application omits SLS to prepare laundry tablets, selects specific mild nonionic and anionic surfactants, avoids the irritation of SLS to the skin and other phenomena, and also avoids the irritation of SLS to the respiratory tract; during production, the harm to workers and consumers is small.

[0052] 2. The specific types of anionic surfactants, nonionic surfactants and film formers in the present application cooperate together, making up for the influence of omitting SLS on the tabletting of the tablet detergent, not only can the tablet detergent be obtained, but also good moisture resistance and dry resistance can be given, and the laundry tablet has a fast dissolution speed in water.

[0053] 3. After omitting SLS, the enzyme preparation's decontamination ability is no longer suppressed, the special system of the present application can protect the integrity and activity of enzyme molecules, improve the catalytic efficiency of enzymes, and provide a good foundation for the decontamination of enzyme preparations. The enzyme preparation can still play a significant decontamination role under long-term storage of the laundry tablet. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a test situation diagram of laundry tablets of Examples 1-3 in Test Two.

[0055] Figure 2 is a test situation diagram of laundry tablets of Comparative Examples 8, 9, 12 and 14 in Test Two. DETAILED DESCRIPTION

[0056] The present application will be further described in detail below in combination with the drawings and examples.

[0057] The raw materials used in the following examples and comparative examples are all commercially available products.

[0058] The following is a source description of some of the raw materials used in the present application:

[0059] The modified hydroxyethyl cellulose can be selected from QP-100MH of Guangzhou Huanyi Wang Chemical Co., Ltd., with a viscosity of 4400-6000.

[0060] The modified hydroxypropyl cellulose can be selected from H-HPC of Changsha Gumeng Chemical Technology Co., Ltd.

[0061] The modified hydroxypropyl methyl cellulose can be selected from XWS-69 of Hebei Yida Cellulose Co., Ltd., with a viscosity of 60000.

[0062] The oil ethoxylate compound can be selected from SOE-N-60 of Wanhua Chemical Group Co., Ltd.

[0063] The EO / PO block polyether can be selected from Liaoning Kelong Fine Chemical Co., Ltd.

[0064] The plant saponin can be selected from Guangdong Jingqu Biological Technology Co., Ltd.

[0065] Example 1

[0066] A laundry tablet without SLS surfactant is prepared by drying the slurry.

[0067] The slurry comprises the following raw materials: film-forming agent, anionic surfactant, non-ionic surfactant, chelating agent, enzyme preparation, auxiliary agent, essence, water.

[0068] The film-forming agent comprises film-forming agent A and film-forming agent B, film-forming agent A is polyvinyl alcohol, and film-forming agent B is modified hydroxyethyl cellulose.

[0069] The anionic surfactant is sodium α-alkenyl sulfonate and sodium fatty acid methyl ester sulfonate.

[0070] The non-ionic surfactant is fatty alcohol polyoxyethylene ether and oil ethoxy compound.

[0071] The chelating agent is gluconic acid and sodium gluconate.

[0072] The enzyme preparation (liquid) is protease and amylase.

[0073] The auxiliary agent is glycerol.

[0074] Specifically, the slurry comprises: polyvinyl alcohol 26 kg, hydroxyethyl cellulose 5 kg, sodium α-alkenyl sulfonate 20 kg, sodium fatty acid methyl ester sulfonate 10 kg, fatty alcohol polyoxyethylene ether 2 kg, oil ethoxy compound 1 kg, gluconic acid 0.15 kg, sodium gluconate 1.35 kg, protease 0.5 kg, amylase 0.5 kg, glycerol 1.0 kg, essence 0.2 kg, and water 32.3 kg.

[0075] The embodiment also provides a preparation method of the laundry tablet without SLS surfactant, comprising the following steps:

[0076] Step 1: mix film-forming agent A with water at 80°C, and stir constantly until the material is fully swelled and dissolved.

[0077] Step 2: add film-forming agent B to the material of step 1, and continue to stir until fully dissolved.

[0078] Step 3: add chelating agent, anionic surfactant, and non-ionic surfactant to the material of step 2, and stir and dissolve for 30 min.

[0079] Step 4: reduce the temperature to 42°C, add the remaining raw materials to the material of step 3, and continue to stir until uniform, to obtain a slurry.

[0080] Step 5: dry the slurry, shape and slice to obtain the laundry tablet without SLS surfactant.

[0081] Example 2

[0082] A laundry tablet without SLS surfactant, which is different from example 1 in that,

[0083] The film forming agent A is polyvinyl alcohol, and the film forming agent B is modified hydroxypropyl methyl cellulose.

[0084] The anionic surfactant is sodium α-alkenyl sulfonate and sodium fatty acid methyl ester sulfonate.

[0085] The nonionic surfactant is fatty acid methyl ester ethoxylate and plant saponin.

[0086] The chelating agent is gluconic acid and sodium gluconate.

[0087] The enzyme preparation (liquid) is mannanase, protease, amylase, and lipase.

[0088] The auxiliary agent is propylene glycol.

[0089] Specifically, the slurry includes: polyvinyl alcohol 15 kg, hydroxypropyl cellulose 3 kg, sodium α-alkenyl sulfonate 20 kg, sodium fatty acid methyl ester sulfonate 10 kg, fatty acid methyl ester ethoxylate 4 kg, plant saponin 1 kg, gluconic acid 0.15 kg, sodium gluconate 1.3 kg, mannanase 0.2 kg, protease 0.5 kg, amylase 0.5 kg, lipase 0.5 kg, propylene glycol 2.0 kg, essence 0.2 kg, and water 41.65 kg.

[0090] A method for preparing a laundry tablet is the same as example 1, which is not described here.

[0091] Example 3

[0092] A laundry tablet without SLS surfactant, which is different from example 1 in that,

[0093] The slurry includes the following raw materials: film forming agent, anionic surfactant, nonionic surfactant, chelating agent, enzyme preparation, auxiliary agent, essence, water, and filler.

[0094] The film forming agent A is polyvinyl alcohol, and the film forming agent B is modified hydroxypropyl methyl cellulose.

[0095] The anionic surfactant is sodium α-alkenyl sulfonate and sodium fatty acid methyl ester sulfonate.

[0096] The nonionic surfactant is oil ethoxylate and alkyl glycoside.

[0097] The chelating agent is sodium gluconate.

[0098] The enzyme preparation (liquid) is pectinase, protease, amylase, and lipase.

[0099] The auxiliary agent is glycerol.

[0100] The filler is kaolin.

[0101] Specifically, the slurry comprises: polyvinyl alcohol 12 kg, hydroxypropyl methyl cellulose 4 kg, sodium alpha-olefin sulfonate 15 kg, sodium fatty acid methyl ester sulfonate 5 kg, oil and fat ethoxylated compound 3 kg, alkyl glycoside 1 kg, kaolin 5 kg, sodium gluconate 1.3 kg, pectinase 0.2 kg, protease 0.5 kg, amylase 0.5 kg, lipase 0.5 kg, glycerol 2.5 kg, essence 0.2 kg, and water 49.3 kg.

[0102] A method for preparing a laundry tablet is the same as that of Example 1, which is not described herein.

[0103] Example 4

[0104] A laundry tablet without SLS surfactant, which is different from Example 3 in that,

[0105] The slurry comprises the following raw materials: film-forming agent, anionic surfactant, non-ionic surfactant, chelating agent, enzyme preparation, auxiliary agent, essence, water, and filler.

[0106] The film-forming agent A is polyvinyl alcohol, and the film-forming agent B is hydroxyethyl cellulose and hydroxypropyl methyl cellulose.

[0107] The anionic surfactant is sodium alpha-olefin sulfonate and sodium fatty acid methyl ester sulfonate.

[0108] The non-ionic surfactant is EO / PO block polyether and alcohol ether glycoside.

[0109] The chelating agent is trisodium aspartic acid diacetate.

[0110] The enzyme preparation (liquid) is protease and lipase.

[0111] The auxiliary agent is glycerol.

[0112] The filler is corn starch.

[0113] Specifically, the slurry comprises: polyvinyl alcohol 10 kg, hydroxyethyl cellulose 1 kg, hydroxypropyl methyl cellulose 1 kg, sodium alpha-olefin sulfonate 10 kg, sodium fatty acid methyl ester sulfonate 5 kg, corn starch 10 kg, EO / PO block polyether 10 kg, alcohol ether glycoside 2 kg, trisodium aspartic acid diacetate 1.3 kg, protease 0.5 kg, lipase 0.5 kg, glycerol 2.5 kg, essence 0.25 kg, and water 45.95 kg.

[0114] A method for preparing a laundry tablet is the same as that of Example 1, which is not described herein.

[0115] Example 5

[0116] A laundry tablet without SLS surfactant, which differs from Example 1 in that the slurry comprises: polyvinyl alcohol 26 kg, hydroxyethyl cellulose 5 kg, sodium alpha-olefin sulfonate 25 kg, sodium fatty acid methyl ester sulfonate 15 kg, fatty alcohol polyoxyethylene ether 2 kg, fatty acid methyl ester ethoxylate 1 kg, gluconic acid 0.15 kg, sodium gluconate 1.35 kg, protease 0.5 kg, amylase 0.5 kg, glycerol 1.0 kg, fragrance 0.2 kg, water 22.3 kg.

[0117] A method for preparing a laundry tablet is the same as Example 1, which is not described here.

[0118] Comparative Example

[0119] Comparative Example 1

[0120] A laundry tablet, which differs from Example 1 in that the anionic surfactant is only sodium dodecyl sulfate.

[0121] That is, the slurry comprises: polyvinyl alcohol 26 kg, hydroxyethyl cellulose 5 kg, sodium dodecyl sulfate 30 kg, fatty alcohol polyoxyethylene ether 2 kg, alkyl glycoside 1 kg, gluconic acid 0.15 kg, sodium gluconate 1.35 kg, protease 0.5 kg, amylase 0.5 kg, glycerol 1.0 kg, fragrance 0.2 kg, water 32.3 kg.

[0122] A method for preparing a laundry tablet is the same as Example 1, which is not described here.

[0123] Comparative Example 2

[0124] A laundry tablet, which differs from Example 1 in that the slurry comprises: polyvinyl alcohol 26 kg, hydroxyethyl cellulose 5 kg, sodium dodecyl sulfate 10 kg, sodium alpha-olefin sulfonate 10 kg, sodium fatty acid methyl ester sulfonate 10 kg, fatty alcohol polyoxyethylene ether 2 kg, alkyl glycoside 1 kg, gluconic acid 0.15 kg, sodium gluconate 1.35 kg, protease 0.5 kg, amylase 0.5 kg, glycerol 1.0 kg, fragrance 0.2 kg, water 32.3 kg.

[0125] A method for preparing a laundry tablet is the same as Example 1, which is not described here.

[0126] Comparative Example 3

[0127] A laundry tablet without SLS surfactant, which differs from Example 1 in that an equal amount of citric acid is used instead of gluconic acid, and an equal amount of sodium citrate is used instead of an equal amount of sodium gluconate.

[0128] The slurry comprises: polyvinyl alcohol 26 kg, hydroxyethyl cellulose 5 kg, sodium alpha-alkenyl sulfonate 20 kg, sodium fatty acid methyl ester sulfonate 10 kg, fatty alcohol polyoxyethylene ether 2 kg, alkyl glycoside 1 kg, citric acid 0.15 kg, sodium citrate 1.35 kg, protease 0.5 kg, amylase 0.5 kg, glycerol 1.0 kg, essence 0.2 kg, and water 32.3 kg.

[0129] A laundry tablet is prepared according to the same method as in Example 1, and the preparation method is not described here.

[0130] Comparative Example 4

[0131] A laundry tablet without SLS surfactant is prepared according to the same method as in Example 1, except that the enzyme preparation is omitted, and the amount of the enzyme preparation is made up with water.

[0132] A laundry tablet is prepared according to the same method as in Example 1, and the preparation method is not described here.

[0133] Comparative Example 5

[0134] A laundry tablet without SLS surfactant is prepared according to the same method as in Example 1, except that the enzyme preparation is omitted, and the amount of the enzyme preparation is made up with water.

[0135] A laundry tablet is prepared according to the same method as in Example 1, and the preparation method is not described here.

[0136] Comparative Example 6

[0137] A laundry tablet without SLS surfactant is prepared according to the same method as in Example 1, except that the enzyme preparation is omitted, and the amount of the enzyme preparation is made up with water.

[0138] A laundry tablet is prepared according to the same method as in Example 1, and the preparation method is not described here.

[0139] Comparative Example 7

[0140] A laundry tablet without SLS surfactant is prepared according to the same method as in Example 1, except that the enzyme preparation is omitted, and the amount of the enzyme preparation is made up with water.

[0141] A laundry tablet is prepared according to the same method as in Example 1, and the preparation method is not described here.

[0142] Comparative Example 8

[0143] A laundry tablet without SLS surfactant is prepared according to the same method as in Example 1, except that polyvinylpyrrolidone is used instead of an equal amount of hydroxypropyl cellulose.

[0144] The slurry comprises: polyvinyl alcohol 15 kg, polyvinylpyrrolidone 3 kg, sodium alpha-alkenyl sulfonate 20 kg, sodium fatty acid methyl ester sulfonate 10 kg, fatty acid methyl ester ethoxylate 4 kg, plant saponin 1 kg, gluconic acid 0.15 kg, sodium gluconate 1.3 kg, mannanase 0.2 kg, protease 0.5 kg, amylase 0.5 kg, lipase 0.5 kg, propylene glycol 2.0 kg, essence 0.2 kg, and water 41.65 kg.

[0145] A method for preparing a laundry tablet is the same as that of Example 1, and is not described herein again.

[0146] Comparative Example 9

[0147] A laundry tablet without SLS surfactant, which is different from Example 2 in that the amount of hydroxypropyl cellulose is omitted, and the amount of original hydroxypropyl cellulose is supplemented with water.

[0148] The slurry comprises: polyvinyl alcohol 15 kg, sodium alpha-alkenyl sulfonate 20 kg, sodium fatty acid methyl ester sulfonate 10 kg, fatty acid methyl ester ethoxylate 4 kg, plant saponin 1 kg, gluconic acid 0.15 kg, sodium gluconate 1.3 kg, mannanase 0.2 kg, protease 0.5 kg, amylase 0.5 kg, lipase 0.5 kg, propylene glycol 2.0 kg, essence 0.2 kg, and water 44.65 kg.

[0149] A method for preparing a laundry tablet is the same as that of Example 1, and is not described herein again.

[0150] Comparative Example 10

[0151] A laundry tablet without SLS surfactant, which is different from Example 2 in that the mass ratio of polyvinyl alcohol to hydroxypropyl cellulose is 1:1.

[0152] The slurry comprises: polyvinyl alcohol 15 kg, hydroxypropyl cellulose 15 kg, sodium alpha-alkenyl sulfonate 20 kg, sodium fatty acid methyl ester sulfonate 10 kg, fatty acid methyl ester ethoxylate 4 kg, plant saponin 1 kg, gluconic acid 0.15 kg, sodium gluconate 1.3 kg, mannanase 0.2 kg, protease 0.5 kg, amylase 0.5 kg, lipase 0.5 kg, propylene glycol 2.0 kg, essence 0.2 kg, and water 29.65 kg.

[0153] A method for preparing a laundry tablet is the same as that of Example 1, and is not described herein again.

[0154] Comparative Example 11

[0155] A laundry tablet without SLS surfactant, which is different from Example 2 in that the mass ratio of polyvinyl alcohol to hydroxypropyl cellulose is 16:1.

[0156] The slurry comprises: polyvinyl alcohol 16 kg, hydroxypropyl cellulose 1 kg, sodium a-alkenyl sulfonate 20 kg, sodium fatty acid methyl ester sulfonate 10 kg, fatty acid methyl ester ethoxylate 4 kg, plant saponin 1 kg, gluconic acid 0.15 kg, sodium gluconate 1.3 kg, mannanase 0.2 kg, protease 0.5 kg, amylase 0.5 kg, lipase 0.5 kg, propylene glycol 2.0 kg, essence 0.2 kg, and water 42.65 kg.

[0157] A method for preparing a laundry tablet is the same as that of Example 1, which is not described here.

[0158] Comparative Example 12

[0159] A laundry tablet, which is different from Example 1 in that the slurry comprises: polyvinyl alcohol 8 kg, sodium dodecyl sulfate 20 kg, sodium dodecyl sulfonate 8 kg, citric acid 0.88 kg, glycerol 5 kg, lauryl amidopropyl betaine 5 kg, fatty alcohol polyoxyethylene ether 1.5 kg, tea tree essential oil 3 kg, potassium cocoate 3 kg, rhamnolipid 3 kg, and pectinase 0.5 kg, protease 0.5 kg, and water 41.62 kg.

[0160] A method for preparing a laundry tablet, comprising the following steps:

[0161] Step 1: Mix polyvinyl alcohol with water at 80°C, and stir constantly until the material is fully swelled and dissolved.

[0162] Step 2: Add citric acid, sodium dodecyl sulfate, sodium dodecyl sulfonate, lauryl amidopropyl betaine, fatty alcohol polyoxyethylene ether, tea tree essential oil, plant surfactant, and rhamnolipid to the material of Step 1, and stir for 30 min until dissolved.

[0163] Step 3: Cool to 42°C, and add the remaining raw materials to the material of Step 2, and continue stirring until uniform to obtain a slurry.

[0164] Step 4: Dry the slurry, shape into tablets, slice, and obtain laundry tablets.

[0165] Comparative Example 13

[0166] A laundry tablet, which is different from Comparative Example 12 in that an equal amount of sodium dodecyl sulfonate is used to replace sodium dodecyl sulfate.

[0167] The slurry comprises: polyvinyl alcohol 8 kg, sodium dodecyl sulfate 28 kg, citric acid 0.88 kg, glycerol 5 kg, lauryl amidopropyl betaine 5 kg, fatty alcohol polyoxyethylene ether 1.5 kg, tea tree essential oil 3 kg, potassium cocoate 3 kg, rhamnolipid 3 kg, pectinase 0.5 kg, protease 0.5 kg, and water 41.62 kg.

[0168] A method for preparing a laundry tablet is the same as Comparative Example 12, and is not described here.

[0169] Comparative Example 14

[0170] A laundry tablet, which is different from Comparative Example 12 in that,

[0171] The slurry comprises: polyvinyl alcohol 8 kg, sodium dodecyl sulfate 28 kg, citric acid 0.88 kg, glycerol 5 kg, lauryl amidopropyl betaine 5 kg, fatty alcohol polyoxyethylene ether 1.5 kg, tea tree essential oil 3 kg, potassium cocoate 3 kg, rhamnolipid 3 kg, pectinase 0.5 kg, protease 0.5 kg, and water 41.62 kg.

[0172] A method for preparing a laundry tablet is the same as Comparative Example 12, and is not described here.

[0173] Comparative Example 15

[0174] A laundry tablet containing no SLS surfactant, which is different from Example 1 in that the nonionic surfactant is lauryl amidopropyl betaine.

[0175] The slurry comprises: polyvinyl alcohol 8 kg, sodium dodecyl sulfate 28 kg, citric acid 0.88 kg, glycerol 5 kg, lauryl amidopropyl betaine 5 kg, fatty alcohol polyoxyethylene ether 1.5 kg, tea tree essential oil 3 kg, potassium cocoate 3 kg, rhamnolipid 3 kg, pectinase 0.5 kg, protease 0.5 kg, and water 41.62 kg.

[0176] A method for preparing a laundry tablet is the same as Comparative Example 12, and is not described here.

[0177] Performance test test

[0178] Test 1: Detergency

[0179] According to GB / T 13174-2021 "Detergency and cyclic washing performance of laundry detergents", the washing water is 250 mg / kg CaCl2hard water, and the test cloth is national standard carbon black JB-01 stained cloth, national standard protein JB-02 stained cloth, and national standard sebum JB-03 stained cloth. The standard laundry detergent is 0.2%, and the stain removal ratio Pi is obtained. The test results are shown in Tables 1-1, 1-2, 1-3 and 1-4, respectively.

[0180] Wherein when Pi≥1.0 is qualified, and Pi<1.0 is unqualified.

[0181] ΔA is the difference in whiteness before and after washing the test cloth with laundry tablets

[0182] ΔB is the difference in whiteness before and after washing the test cloth with standard laundry detergent

[0183] Table 1-1 Difference in stain removal ratio of laundry tablets without enzyme (laundry tablet concentration is 0.2%)

[0184] In Comparative Example 1-2, sodium dodecyl sulfate was used simultaneously with the enzyme preparation. According to the test results in Table 1-1, compared with Example 1, the stain removal ability of the enzyme preparation cannot be fully utilized, and Comparative Example 1-2 destroys the cooperation of anionic surfactants, nonionic surfactants, and film formers, and the stain removal ability decreases significantly. The chelating agent used in Example 1 is gluconic acid and sodium gluconate, and the stain removal ability of this combination is better than that of Comparative Example 3 using citric acid and sodium citrate. It is speculated that the chelating ability of gluconic acid and its salt is stronger than that of citric acid and its salt, which enhances the stain removal ability of laundry tablets in hard water.

[0185] Table 1-2 Stain removal effect on the first day of room temperature storage

[0186] Comparative Examples 1 and 2 added SLS to the laundry tablets, so theoretically, their stain removal ability should be stronger than that of the mild type of surfactant. However, due to the influence of SLS on the enzyme preparation, the stain removal ability of the enzyme preparation cannot be fully utilized, so the stain removal effect of Comparative Example 1-2 is far inferior to that of Example 1-3.

[0187] Table 1-3 Stain removal effect on the third day of room temperature storage

[0188] Table 1-4 Stain removal effect on the seventh day of room temperature storage

[0189] According to the test data in Table 1, the laundry tablets of Example 1-3 all show strong stain removal ability in the tests on the 1st, 3rd and 7th days of storage.

[0190] Test two: moisture resistance

[0191] A box of washing tablets (with washing tablets stacked inside up and down) was placed in a test environment with a temperature of (25±2) °C and a relative humidity of (85±5) %, repeated for 4 groups. At 24, 48, 72, and 96 h, one group was taken out, then two washing tablets were separated, and whether there was adhesion between the tablets was observed. The results were recorded in Table 2.

[0192] The adhesion phenomenon was divided into no adhesion (the tablets could be separated directly), slight adhesion (separated forcibly, with no damage to the adhesion surface), obvious adhesion (part of the area was directly adhered together and could not be separated), and severe adhesion (adhered to each other and could not be separated).

[0193] Table 2

[0194] According to the test data in Table 2, the laundry tablets of Examples 1-5 were continuously formed without breaking, and showed excellent moisture resistance and high stability at 24, 48, 72, and 96 h.

[0195] The adhesion phenomenon of the laundry tablets of Examples 1-3 at 24, 48, 72, and 96 h was referred to Figure 1.

[0196] The adhesion phenomenon of the laundry tablets of Comparative Examples 8, 9, 12, and 14 at 24, 48, 72, and 96 h was referred to Figure 2.

[0197] Test three: dry resistance

[0198] According to QB / T5779-2023 "Laundry Tablets", the washing tablets were placed in a test environment with a temperature of (55±2) °C, and the weight of the washing tablets before and after the test was measured using an analytical balance. The weight loss rate was calculated and recorded in Table 3.

[0199] A weight loss rate greater than 15.0% was unqualified, and a weight loss rate less than or equal to 15% was qualified.

[0200] The morphology of the removed laundry tablets was also observed, and the stability of the formation was recorded in Table 3.

[0201] Table 3

[0202] Although the laundry tablets of Comparative Example 10 had a low weight loss rate and tablet formation, they were not soft and had a brittle texture. After losing water, they were more likely to crack on the surface and were not resistant to dryness, so they were determined to be unqualified.

[0203] Test four: solubility

[0204] According to QB / T5779-2023 "laundry tablets", 700 mL of hard water (250 mg / kg of calcium chloride) was placed in a 1 L beaker, placed in a (23±2) °C water bath environment, and the stirring speed of the magnetic stirring was adjusted. The laundry tablets were cut into 3 cm*3 cm square pieces, and were thrown vertically into the water 10 cm away from the water surface. The dissolution time was recorded when the sample completely dispersed in the water. The test was repeated three times in parallel.

[0205] The dissolution time was recorded in Table 4.

[0206] Table 4

[0207] Although the moisture stability of Comparative Examples 10 and 11 was good, the dissolution time was long in the dissolution test, and the overall performance was not good.

[0208] Comparative Example 12 was a laundry tablet containing SLS, and Comparative Examples 13 and 14 were laundry tablets prepared by completely or partially replacing SLS with other anionic surfactants. When SLS was completely replaced (Comparative Example 13), the laundry tablet could not be formed. When SLS was partially replaced (Comparative Example 14), although the laundry tablet could be formed, the moisture and dry stability was poor, the laundry tablet slightly adhered in a high-humidity environment for 24 h, the weight loss rate of the laundry tablet was greater than 15% in a dry environment at 55 °C, and the laundry tablet became uneven fragments, which was an unqualified laundry tablet. It was shown that SLS was a key component for the formation and stability of the laundry tablet, and it was impossible to obtain a qualified and stable laundry tablet by simply replacing SLS with other surfactants.

[0209] However, by selecting a specific system to prepare the laundry tablet, the laundry tablet obtained by the present application has fast dissolution, good moisture and dry resistance, and good decontamination effect, and has a good development prospect.

[0210] The specific embodiments are merely an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A laundry tablet free of SLS surfactant, characterised in that, Prepared by drying the slurry; according to the weight percentage, the slurry comprises the following raw materials: 10%-40% film-forming agent, 15%-40% anionic surfactant, 2%-12% non-ionic surfactant, 0.5%-5% chelating agent, 0.4%-4% enzyme preparation, 0.5%-5% auxiliary agent, 0.1%-1% essence; The film-forming agent comprises film-forming agent A and film-forming agent B, the film-forming agent A is polyvinyl alcohol, and the film-forming agent B comprises at least one of cellulose and dodecenyl succinate starch; The anionic surfactant comprises at least two of sodium alpha-alkenyl sulfonate, sodium fatty acid methyl ester sulfonate and sodium hydroxyethyl sulfonate; The non-ionic surfactant comprises at least two of fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate, oil and fat ethoxylate, EO / PO block polyether, plant saponin, alkyl glycoside and alcohol ether glycoside; The chelating agent comprises at least one of gluconic acid and its salt, glutamic acid diacetic acid and its salt, methyl glycine diacetic acid and its salt, aspartic acid diacetic acid and its salt.

2. A laundry tablet according to claim 1 characterised in that: The film-forming agent is film-forming agent A and film-forming agent B, the film-forming agent A is polyvinyl alcohol, and the film-forming agent B is cellulose; The anionic surfactant is sodium alpha-alkenyl sulfonate and sodium fatty acid methyl ester sulfonate.

3. A laundry tablet according to claim 2, characterised in that: According to the weight percentage of the slurry, the polyvinyl alcohol is 10%-26%, the cellulose is 1%-5%, the sodium alpha-alkenyl sulfonate is 15%-25%, and the sodium fatty acid methyl ester sulfonate is 5%-15%.

4. The laundry tablet according to claim 2, characterized in that: The non-ionic surfactant is at least two of fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate and oil and fat ethoxylate.

5. A laundry tablet according to claim 4, characterised in that: According to the weight percentage of the slurry, the fatty alcohol polyoxyethylene ether is 1%-5%, and the oil and fat ethoxylate is 1%-5%.

6. The laundry sheet according to claim 1, characterized in that: The slurry further comprises 0-25% filler.

7. A laundry tablet according to claim 6, characterised in that: The filler comprises at least one of corn starch, pea starch, cassava starch, zeolite, bentonite, kaolin, sodium sulfate, sodium carbonate and sodium bicarbonate.

8. The laundry sheet according to claim 1, characterized in that: The enzyme preparation comprises at least two of cellulase, protease, amylase, lipase, pectinase, mannanase and phosphodiesterase.

9. The laundry sheet according to claim 1, characterized in that: The auxiliary agent comprises at least one of glycerol, propylene glycol and glucose alcohol.

10. A process for the preparation of laundry tablets according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: Step 1: Mix the film-forming agent A with water at 75-85°C until the material is fully swollen and dissolved; Step 2: Add the film-forming agent B and continue stirring until it is fully dissolved; Step 3: Add the chelating agent, anionic surfactant and non-ionic surfactant and dissolve for 15-60 minutes; Step 4: Add the remaining raw materials at 40-45°C to obtain the slurry; Step 5: Dry the slurry, shape and make tablets to obtain laundry tablets without SLS surfactant.

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