Laundry sheet without SLS surfactant and preparation method thereof

Abstract

The invention relates to a laundry sheet without an SLS surfactant and a preparation method of the laundry sheet. The invention relates to a laundry sheet without an SLS surfactant. The laundry sheet comprises a film-forming agent, an anionic surfactant, a nonionic surfactant, a chelating agent, an enzyme preparation, an auxiliary agent and essence, the film-forming agent comprises one or more of polyvinyl alcohol, cellulose and dodecenyl succinic anhydride modified starch; the anionic surfactant comprises at least two of sodium alpha-olefin sulfonate, sodium fatty acid methyl ester sulfonate and sodium isethionate; the nonionic surfactant comprises at least two of fatty alcohol-polyoxyethylene ether, a fatty acid methyl ester ethyoxyl compound, a grease ethyoxyl compound and the like. According to the preparation method, SLS is omitted, irritation to skin is reduced, the influence of the omitted SLS on preparation of the laundry sheet is made up through specific selection, and the laundry sheet which is good in decontamination effect, high in dissolution speed, good in moisture resistance and dry resistance and high in stability is obtained.

Description

Technical Field

[0001] The present invention relates to the field of sheet-shaped washing products, and more particularly, to a laundry tablet free of SLS surfactant and a preparation method thereof. Background Art

[0002] As people's demands for a better life become higher and higher and they pay more attention to environmental protection, people not only pay attention to product performance, 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 detergents. As an anionic surfactant, SLS has strong penetration and dispersion properties, which makes it have strong cleaning power. At the same time, SLS has good emulsification, foaming and foaming properties. It is the most commonly used and widely used anionic surfactant in cleaning products. It is also an important component that determines the molding and moisture and dry resistance stability of detergent tablets.

[0004] However, SLS is a typical chemical skin irritant with strong permeability and irritation, and has strong degreasing ability. Long-term contact may cause skin irritation and damage, and cause allergic reactions such as rashes, itching and redness. In addition, excessive inhalation of SLS may cause irritation to the respiratory tract. Long-term contact with products containing SLS is harmful to both consumers and production workers. In addition, although SLS has good biodegradability, newly discharged and undegraded SLS entering aquatic ecosystems will 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 is irritating. At present, the amount of SLS added in detergent tablets is far more than 5%. For example, in the prior art, the amount of SLS added to the laundry tablets of patent CN112041418A is 20-36%; the amount of SLS added to the anti-staining laundry tablets of patent CN110042004A is 35%; the amount of SLS added to the fragrance-retaining laundry tablets of patent CN115651778A is 13-20%; the amount of SLS added to the laundry tablets of patent CN106867710A is 20-30%.

[0006] It can be seen that SLS is used in large quantities in detergent tablets and has a great impact on the tablet's molding and moisture and dryness stability, but long-term contact will cause certain irritation to the skin, respiratory tract, etc.

[0007] In addition, since solid detergent products such as detergent tablets / blocks often do not require a measuring tool for dosage when used, and are directly put into use as a single tablet / block, there are certain requirements for the weight and detergency of the product, especially for tablet detergents. Tablet detergents are easy to use and light in weight. In order to have better detergency performance, enzyme preparation compositions are usually added to achieve a stronger cleaning purpose. Enzyme preparations can effectively decompose stubborn macromolecular stains such as milk stains, sweat stains, and rice stains into small molecular water-soluble substances, and they are mild, safe, and specifically decompose stains, which can enhance the detergency of detergents.

[0008] However, SLS has a greater impact on enzyme activity. During the production process, enzyme activity will be destroyed by SLS. In addition, detergent products have a long shelf life. As the storage time increases, the surfactants in detergent products will gradually destroy the spatial conformation of the enzyme, causing the enzyme activity to decrease, thereby affecting the decontamination effect of the detergent product. Summary of the invention

[0009] Omitting SLS has a significant impact on tablet formation and wet and dry stability, while using SLS will prevent the enzyme from fully exerting its cleaning effect.

[0010] In order to solve the above problems, the present application provides a laundry tablet without SLS surfactant and a preparation method thereof.

[0011] In the first aspect, the present application provides a laundry tablet free of SLS surfactant, using the following technical solution:

[0012] A laundry tablet without SLS surfactant, prepared by drying slurry; the slurry comprises the following raw materials in terms of weight percentage: 10%-40% film former, 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% flavor, and water;

[0013] The film-forming agent comprises a film-forming agent A and a film-forming agent B, wherein the film-forming agent A is polyvinyl alcohol, and the film-forming agent B comprises at least one of cellulose and dodecenyl succinate starch ester; the weight ratio of the film-forming agent A to the film-forming agent B is (2-15):1;

[0014] The anionic surfactant includes at least two of sodium α-olefin sulfonate, sodium fatty acid methyl ester sulfonate, and sodium isethionate;

[0015] 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;

[0016] The chelating agent includes at least one of gluconic acid and its salts, glutamic acid diacetic acid and its salts, methylglycine diacetic acid and its salts, aspartic acid diacetic acid and its salts.

[0017] In the technical solution provided in the present application, SLS is omitted. By selecting specific types of anionic surfactants, nonionic surfactants and film-forming agents for combination, the effect of omitting SLS on the flake formation of detergent tablets is compensated. Not only can detergent tablets be obtained, but also good moisture resistance and dryness resistance are given to them, and the laundry tablets dissolve quickly in water.

[0018] After omitting SLS, the decontamination ability of enzyme preparations is no longer suppressed, and the special system of anionic surfactants, nonionic surfactants and film-forming agents of this specific type also provides a good foundation for the decontamination of enzyme preparations. Moreover, when the laundry tablets are stored for a long time, the enzyme preparations can still play a significant decontamination role.

[0019] Specifically, under this special system, sodium α-olefin sulfonate, sodium fatty acid methyl ester sulfonate, and sodium isethionate can be promoted to adsorb on the surface of enzyme molecules to form a protective film to prevent the enzyme molecules from being attacked by external harmful substances, thereby protecting the integrity and activity of the enzyme molecules, improving the catalytic efficiency of the enzyme, and further improving the detergency of detergents. The specially selected non-ionic surfactant has a weaker effect on the central charge of the enzyme site in the special system, and has less impact on the enzyme activity, which can further ensure the activity and integrity of the enzyme preparation.

[0020] In particular, plant saponins, alkyl glycosides, alcohol ether glycosides, etc., as new green surfactants, can significantly reduce the surface tension of detergents, improve the cleaning effect, and at the same time have good foam stability and permeability.

[0021] The present application further limits the types of chelating agents used in special systems. The organic acid / salt structure contains hydroxyl, carboxyl and carboxyl groups, which have good chelating ability for various metal ions, help to remove metal ions in water, prevent their deposition, etc. In addition, it has a certain corrosion inhibition effect on metals, and plays a certain protective role on production equipment, washing machines and metal water pipes during production and use.

[0022] 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;

[0023] Preferably, the cellulose is at least one of modified hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose.

[0024] By adopting the above technical scheme, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose and dodecenyl succinate starch have the advantages of being stable to acid and alkali, biodegradable and not prone to salting out. Blending with polyvinyl alcohol can increase the viscosity of the slurry and enhance the storage moisture resistance.

[0025] The anionic surfactant is sodium α-olefin sulfonate and sodium fatty acid methyl ester sulfonate.

[0026] Preferably, according to the weight percentage of the slurry, the polyvinyl alcohol is 10-26%, the cellulose is 1-5%, the sodium α-olefin sulfonate is 15-25%, and the sodium fatty acid methyl ester sulfonate is 5-15%.

[0027] Preferably, the nonionic surfactant is at least two of fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate, and oil ethoxylate.

[0028] Preferably, according to the weight percentage of the slurry, the fatty alcohol polyoxyethylene ether is 1-5%.

[0029] Preferably, the oil ethoxylate is 1-5% by weight of the slurry.

[0030] Preferably, the fatty acid methyl ester ethoxylate is 1-5% by weight of the slurry.

[0031] Preferably, the nonionic surfactant is an oil ethoxylate or an alkyl glycoside.

[0032] Preferably, according to the weight percentage of the slurry, the oil ethoxylate is 1-5%, and the alkyl glycoside is 0.1-2%.

[0033] Preferably, the nonionic surfactant is fatty acid methyl ester ethoxylate or plant saponin.

[0034] 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%.

[0035] By adopting the above technical scheme, the selection and dosage of anionic surfactants are further limited, and the combination and dosage of nonionic surfactants are further limited, so that the nonionic surfactants, anionic surfactants, film-forming agents and enzyme preparations have a better coordination effect, which can compensate for the impact of omitting SLS and enhance the decontamination, moisture resistance, dryness resistance and other properties of the laundry tablets.

[0036] It is worth mentioning that sodium α-olefin sulfonate and sodium fatty acid methyl ester sulfonate are a type of anionic surfactants with high foaming, good hydrolysis stability and strong resistance to hard water. Under the further definition of this application, they can more fully improve the pH value and ionic strength of the washing environment and create a more suitable environment for enzyme preparations.

[0037] Preferably, the slurry further comprises 0-25% of a filler.

[0038] Preferably, the filler includes at least one of corn starch, pea starch, tapioca starch, zeolite, bentonite, kaolin, sodium sulfate, sodium carbonate, and sodium bicarbonate.

[0039] When the amount of surfactant added is low, fillers can be used to assist in molding; and fillers also have a washing function. Among them, zeolite, bentonite, and kaolin are natural "chelating agents" with layered or porous structures. They capture and fix metal ions such as calcium and magnesium in water through electrostatic adsorption or ion exchange. In addition, they have a large specific surface area and can absorb stains such as oil stains to prevent stains from being deposited on fabrics.

[0040] Preferably, the enzyme preparation comprises at least two of cellulase, protease, amylase, lipase, pectinase, mannanase and phosphodiesterase.

[0041] Preferably, the auxiliary agent includes at least one of glycerol, propylene glycol and glucitol.

[0042] In a second aspect, the present application provides a method for preparing a laundry tablet free of SLS surfactant, using the following technical solution:

[0043] A method for preparing a laundry tablet free of SLS surfactant comprises the following steps:

[0044] Step 1: Mix film former A with water at 75-85°C until the material swells and dissolves completely;

[0045] Step 2: Add film-forming agent B and continue stirring until fully dissolved;

[0046] Step 3: Add chelating agent, anionic surfactant and nonionic surfactant and dissolve for 15-60 minutes;

[0047] Step 4: adding the remaining raw materials at 40-45° C. to obtain a slurry;

[0048] Step 5: Dry the slurry, shape it into tablets, and obtain laundry tablets without SLS surfactant.

[0049] In summary, this application has the following beneficial effects:

[0050] 1. The present application omits SLS to prepare laundry tablets, and selects specific mild nonionic and anionic surfactants to avoid the irritation of SLS to the skin and the irritation of SLS to the respiratory tract; during production, the harm to workers and consumers is small.

[0051] 2. The specific types of anionic surfactants and nonionic surfactants in the present application are combined with film-forming agents to compensate for the effect of omitting SLS on the flake formation of the detergent flakes, and not only can the detergent flakes be obtained, but also good moisture resistance and dryness resistance can be given to the detergent flakes, and the laundry flakes dissolve quickly in water.

[0052] 3. After omitting SLS, the decontamination ability of the enzyme preparation is no longer suppressed. The special system of the present application can protect the integrity and activity of the enzyme molecules, improve the catalytic efficiency of the enzyme, and provide a good foundation for the decontamination of the enzyme preparation. When the laundry tablet is stored for a long time, the enzyme preparation can still play a significant decontamination role. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 1 is a diagram showing the test results of the laundry tablets of Examples 1-3 in Test 2.

[0054] Figure 2 It is a test condition diagram of the laundry tablets of comparative examples 8, 9, 12 and 14 in test 2. DETAILED DESCRIPTION

[0055] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0056] The raw materials used in the following examples and comparative examples are all commercially available products.

[0057] The following is a description of the sources of some of the raw materials used in this application:

[0058] The modified hydroxyethyl cellulose can be selected from QP-100MH of Guangzhou Huazhiwang Chemical Co., Ltd., with a viscosity of 4400-6000.

[0059] The modified hydroxypropyl cellulose may be selected from H-HPC of Changsha Gumeng Chemical Technology Co., Ltd.

[0060] The modified hydroxypropyl methylcellulose can be selected from Hebei Yida Cellulose Co., Ltd. XWS-69, with a viscosity of 60,000.

[0061] The oil ethoxylate can be selected from SOE-N-60 of Wanhua Chemical Group Co., Ltd.

[0062] The EO / PO block polyether can be selected from Liaoning Kelong Fine Chemical Co., Ltd.

[0063] Plant saponins can be selected from Guangdong Jingcui Biotechnology Co., Ltd.

[0064] Example 1

[0065] A laundry tablet free of SLS surfactant is prepared by drying slurry.

[0066] The slurry includes the following raw materials: film-forming agent, anionic surfactant, nonionic surfactant, chelating agent, enzyme preparation, additive, flavor and water.

[0067] The film-forming agent includes 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.

[0068] The anionic surfactant is sodium α-olefin sulfonate and sodium fatty acid methyl ester sulfonate.

[0069] The nonionic surfactants are fatty alcohol polyoxyethylene ethers and oil ethoxylates.

[0070] The chelating agents are gluconic acid and sodium gluconate.

[0071] Enzyme preparations (liquid) include protease and amylase.

[0072] The auxiliary agent is glycerol.

[0073] Specifically, the slurry includes: 26kg of polyvinyl alcohol, 5kg of hydroxyethyl cellulose, 20kg of sodium α-olefin sulfonate, 10kg of sodium fatty acid methyl ester sulfonate, 2kg of fatty alcohol polyoxyethylene ether, 1kg of oil ethoxylate, 0.15kg of gluconic acid, 1.35kg of sodium gluconate, 0.5kg of protease, 0.5kg of amylase, 1.0kg of glycerol, 0.2kg of flavor, and 32.3kg of water.

[0074] This embodiment also provides a method for preparing a laundry tablet without SLS surfactant, comprising the following steps:

[0075] Step 1: Mix film former A with water at 80°C and stir at a constant temperature until the material swells and dissolves completely.

[0076] Step 2: Add film-forming agent B to the material in step 1 and continue stirring until fully dissolved.

[0077] Step 3: Add chelating agent, anionic surfactant and nonionic surfactant to the material in step 2, and stir to dissolve for 30 minutes.

[0078] Step 4: Cool down to 42°C, add the remaining raw materials to the material in step 3, continue stirring until uniform, and obtain slurry.

[0079] Step 5: Dry the slurry, shape and slice it to obtain laundry tablets without SLS surfactant.

[0080] Example 2

[0081] A laundry tablet without SLS surfactant, which is different from Example 1 in that:

[0082] Film-forming agent A is polyvinyl alcohol, and film-forming agent B is modified hydroxypropyl cellulose.

[0083] The anionic surfactant is sodium α-olefin sulfonate and sodium fatty acid methyl ester sulfonate.

[0084] The nonionic surfactants are fatty acid methyl ester ethoxylates and plant saponins.

[0085] The chelating agents are gluconic acid and sodium gluconate.

[0086] Enzyme preparations (liquid) include mannanase, protease, amylase, and lipase.

[0087] The auxiliary agent is propylene glycol.

[0088] Specifically, the slurry includes: 15kg of polyvinyl alcohol, 3kg of hydroxypropyl cellulose, 20kg of sodium α-olefin sulfonate, 10kg of sodium fatty acid methyl ester sulfonate, 4kg of fatty acid methyl ester ethoxylate, 1kg of plant saponin, 0.15kg of gluconic acid, 1.3kg of sodium gluconate, 0.2kg of mannanase, 0.5kg of protease, 0.5kg of amylase, 0.5kg of lipase, 2.0kg of propylene glycol, 0.2kg of flavor, and 41.65kg of water.

[0089] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0090] Example 3

[0091] A laundry tablet without SLS surfactant, which is different from Example 1 in that:

[0092] The slurry includes the following raw materials: film-forming agent, anionic surfactant, nonionic surfactant, chelating agent, enzyme preparation, additive, flavor, water and filler.

[0093] Film-forming agent A is polyvinyl alcohol, and film-forming agent B is modified hydroxypropyl methylcellulose.

[0094] The anionic surfactant is sodium α-olefin sulfonate and sodium fatty acid methyl ester sulfonate.

[0095] Nonionic surfactants include oil ethoxylates and alkyl glycosides.

[0096] The chelating agent is sodium gluconate.

[0097] The enzyme preparation (liquid) is pectinase, protease, amylase, and lipase.

[0098] The auxiliary agent is glycerol.

[0099] The filler is kaolin.

[0100] Specifically, the slurry includes: 12kg of polyvinyl alcohol, 4kg of hydroxypropyl methylcellulose, 15kg of sodium α-olefin sulfonate, 5kg of sodium fatty acid methyl ester sulfonate, 3kg of oil ethoxylate, 1kg of alkyl glycoside, 5kg of kaolin, 1.3kg of sodium gluconate, 0.2kg of pectinase, 0.5kg of protease, 0.5kg of amylase, 0.5kg of lipase, 2.5kg of glycerin, 0.2kg of flavor, and 49.3kg of water.

[0101] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0102] Example 4

[0103] A laundry tablet without SLS surfactant, which is different from Example 3 in that:

[0104] The slurry includes the following raw materials: film-forming agent, anionic surfactant, nonionic surfactant, chelating agent, enzyme preparation, additive, flavor, water and filler.

[0105] The film-forming agent A is polyvinyl alcohol, and the film-forming agent B is hydroxyethyl cellulose and hydroxypropyl methyl cellulose.

[0106] The anionic surfactant is sodium α-olefin sulfonate and sodium fatty acid methyl ester sulfonate.

[0107] The nonionic surfactants are EO / PO block polyether and alcohol ether glycoside.

[0108] The chelating agent is trisodium aspartate diacetate.

[0109] The enzyme preparation (liquid) is protease and lipase.

[0110] The auxiliary agent is glycerol.

[0111] The filler is corn starch.

[0112] Specifically, the slurry includes: 10kg of polyvinyl alcohol, 1kg of hydroxyethyl cellulose, 1kg of hydroxypropyl methylcellulose, 10kg of sodium α-olefin sulfonate, 5kg of sodium fatty acid methyl ester sulfonate, 10kg of corn starch, 10kg of EO / PO block polyether, 2kg of alcohol ether glycoside, 1.3kg of trisodium aspartic acid diacetate, 0.5kg of protease, 0.5kg of lipase, 2.5kg of glycerol, 0.25kg of flavor, and 45.95kg of water.

[0113] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0114] Example 5

[0115] A laundry tablet without SLS surfactant, which is different from Example 1 in that the slurry includes: 26 kg of polyvinyl alcohol, 5 kg of hydroxyethyl cellulose, 25 kg of sodium α-olefin sulfonate, 15 kg of sodium fatty acid methyl ester sulfonate, 2 kg of fatty alcohol polyoxyethylene ether, 1 kg of fatty acid methyl ester ethoxylate, 0.15 kg of gluconic acid, 1.35 kg of sodium gluconate, 0.5 kg of protease, 0.5 kg of amylase, 1.0 kg of glycerol, 0.2 kg of flavor, and 22.3 kg of water.

[0116] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0117] Comparative Example

[0118] Comparative Example 1

[0119] A laundry tablet, which is different from Example 1 in that only sodium lauryl sulfate is used as an anionic surfactant.

[0120] That is, the slurry includes: 26kg of polyvinyl alcohol, 5kg of hydroxyethyl cellulose, 30kg of sodium lauryl sulfate, 2kg of fatty alcohol polyoxyethylene ether, 1kg of alkyl glycoside, 0.15kg of gluconic acid, 1.35kg of sodium gluconate, 0.5kg of protease, 0.5kg of amylase, 1.0kg of glycerol, 0.2kg of flavor, and 32.3kg of water.

[0121] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0122] Comparative Example 2

[0123] A laundry tablet, which is different from Example 1 in that the slurry includes: 26kg of polyvinyl alcohol, 5kg of hydroxyethyl cellulose, 10kg of sodium dodecyl sulfate, 10kg of sodium α-olefin sulfonate, 10kg of sodium fatty acid methyl ester sulfonate, 2kg of fatty alcohol polyoxyethylene ether, 1kg of alkyl glycoside, 0.15kg of gluconic acid, 1.35kg of sodium gluconate, 0.5kg of protease, 0.5kg of amylase, 1.0kg of glycerol, 0.2kg of flavor, and 32.3kg of water.

[0124] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0125] Comparative Example 3

[0126] A laundry tablet without SLS surfactant, which is different from Example 1 in that an equal amount of citric acid is used to replace gluconic acid, and an equal amount of sodium citrate is used to replace an equal amount of sodium gluconate.

[0127] The slurry includes: 26kg of polyvinyl alcohol, 5kg of hydroxyethyl cellulose, 20kg of sodium α-olefin sulfonate, 10kg of sodium fatty acid methyl ester sulfonate, 2kg of fatty alcohol polyoxyethylene ether, 1kg of alkyl glycoside, 0.15kg of citric acid, 1.35kg of sodium citrate, 0.5kg of protease, 0.5kg of amylase, 1.0kg of glycerol, 0.2kg of flavor, and 32.3kg of water.

[0128] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0129] Comparative Example 4

[0130] A laundry tablet without SLS surfactant, which is different from Example 1 in that the enzyme preparation is omitted and the amount of the original enzyme preparation is supplemented with water.

[0131] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0132] Comparative Example 5

[0133] A laundry tablet without SLS surfactant, which is different from Comparative Example 1 in that the enzyme preparation is omitted and the amount of the original enzyme preparation is supplemented with water.

[0134] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0135] Comparative Example 6

[0136] A laundry tablet without SLS surfactant, which is different from Comparative Example 2 in that the enzyme preparation is omitted and the amount of the original enzyme preparation is supplemented with water.

[0137] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0138] Comparative Example 7

[0139] A laundry tablet without SLS surfactant, which is different from Comparative Example 3 in that the enzyme preparation is omitted and the amount of the original enzyme preparation is supplemented with water.

[0140] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0141] Comparative Example 8

[0142] A laundry tablet without SLS surfactant, which is different from Example 2 in that polyvinyl pyrrolidone is used to replace an equal amount of hydroxypropyl cellulose.

[0143] The slurry includes: 15kg of polyvinyl alcohol, 3kg of polyvinyl pyrrolidone, 20kg of sodium α-olefin sulfonate, 10kg of sodium fatty acid methyl ester sulfonate, 4kg of fatty acid methyl ester ethoxylate, 1kg of plant saponin, 0.15kg of gluconic acid, 1.3kg of sodium gluconate, 0.2kg of mannanase, 0.5kg of protease, 0.5kg of amylase, 0.5kg of lipase, 2.0kg of propylene glycol, 0.2kg of flavor, and 41.65kg of water.

[0144] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0145] Comparative Example 9

[0146] A laundry tablet without SLS surfactant, which is different from Example 2 in that hydroxypropyl cellulose is omitted and the amount of the original hydroxypropyl cellulose is supplemented with water.

[0147] The slurry includes: 15kg of polyvinyl alcohol, 20kg of sodium α-olefin sulfonate, 10kg of sodium fatty acid methyl ester sulfonate, 4kg of fatty acid methyl ester ethoxylate, 1kg of plant saponin, 0.15kg of gluconic acid, 1.3kg of sodium gluconate, 0.2kg of mannanase, 0.5kg of protease, 0.5kg of amylase, 0.5kg of lipase, 2.0kg of propylene glycol, 0.2kg of flavor, and 44.65kg of water.

[0148] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0149] Comparative Example 10

[0150] 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.

[0151] The slurry includes: 15kg of polyvinyl alcohol, 15kg of hydroxypropyl cellulose, 20kg of sodium α-olefin sulfonate, 10kg of sodium fatty acid methyl ester sulfonate, 4kg of fatty acid methyl ester ethoxylate, 1kg of plant saponin, 0.15kg of gluconic acid, 1.3kg of sodium gluconate, 0.2kg of mannanase, 0.5kg of protease, 0.5kg of amylase, 0.5kg of lipase, 2.0kg of propylene glycol, 0.2kg of flavor, and 29.65kg of water.

[0152] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0153] Comparative Example 11

[0154] 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.

[0155] The slurry includes: 16kg of polyvinyl alcohol, 1kg of hydroxypropyl cellulose, 20kg of sodium α-olefin sulfonate, 10kg of sodium fatty acid methyl ester sulfonate, 4kg of fatty acid methyl ester ethoxylate, 1kg of plant saponin, 0.15kg of gluconic acid, 1.3kg of sodium gluconate, 0.2kg of mannanase, 0.5kg of protease, 0.5kg of amylase, 0.5kg of lipase, 2.0kg of propylene glycol, 0.2kg of flavor, and 42.65kg of water.

[0156] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0157] Comparative Example 12

[0158] A laundry tablet, which is different from Example 1 in that the slurry includes: 8kg of polyvinyl alcohol, 20kg of sodium lauryl sulfate, 8kg of sodium lauryl sulfonate, 0.88kg of citric acid, 5kg of glycerol, 5kg of lauryl amide propyl betaine, 1.5kg of fatty alcohol polyoxyethylene ether, 3kg of tea tree essential oil, 3kg of potassium cocoate, 3kg of rhamnolipid and 0.5kg of pectinase, 0.5kg of protease, and 41.62kg of water.

[0159] A method for preparing a laundry tablet comprises the following steps:

[0160] Step 1: Mix polyvinyl alcohol and water at 80°C and stir at a constant temperature until the material swells and dissolves completely.

[0161] Step 2: Add citric acid, sodium lauryl sulfate, sodium lauryl sulfonate, lauryl amide propyl betaine, fatty alcohol polyoxyethylene ether, tea tree essential oil, plant surfactants, and rhamnolipid to the materials in step 1, and stir to dissolve for 30 minutes.

[0162] Step 3: Cool down to 42°C, add the remaining raw materials to the material in step 2, continue stirring until uniform, and obtain slurry.

[0163] Step 4: Dry the slurry, shape and slice it to obtain laundry tablets.

[0164] Comparative Example 13

[0165] 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.

[0166] The slurry includes: 8kg of polyvinyl alcohol, 28kg of sodium dodecyl sulfate, 0.88kg of citric acid, 5kg of glycerol, 5kg of lauryl amide propyl betaine, 1.5kg of fatty alcohol polyoxyethylene ether, 3kg of tea tree essential oil, 3kg of potassium cocoate, 3kg of rhamnolipid, 0.5kg of pectinase, 0.5kg of protease, and 41.62kg of water.

[0167] The preparation method of a laundry tablet is the same as that of Comparative Example 12 and will not be repeated here.

[0168] Comparative Example 14

[0169] A laundry tablet, which is different from Comparative Example 12 in that:

[0170] The slurry includes: 8kg of polyvinyl alcohol, 10kg of sodium lauryl sulfate, 18kg of sodium lauryl sulfonate, 0.88kg of citric acid, 5kg of glycerol, 5kg of lauryl amidopropyl betaine, 1.5kg of fatty alcohol polyoxyethylene ether, 3kg of tea tree essential oil, 3kg of potassium cocoate, 3kg of rhamnolipid and 0.5kg of pectinase, 0.5kg of protease, and 41.62kg of water.

[0171] The preparation method of a laundry tablet is the same as that of Comparative Example 12 and will not be repeated here.

[0172] Comparative Example 15

[0173] A laundry tablet without SLS surfactant, which is different from Example 1 in that the nonionic surfactant is lauroamidopropyl betaine.

[0174] The slurry includes: 26kg of polyvinyl alcohol, 5kg of hydroxyethyl cellulose, 20kg of sodium α-olefin sulfonate, 10kg of sodium fatty acid methyl ester sulfonate, 3kg of lauryl amide propyl betaine, 0.15kg of gluconic acid, 1.35kg of sodium gluconate, 0.5kg of protease, 0.5kg of amylase, 1.0kg of glycerol, 0.2kg of flavor, and 32.3kg of water.

[0175] The preparation method of a laundry tablet is the same as that in Example 1 and will not be described in detail here.

[0176] Performance testing

[0177] Test 1: Detergency

[0178] According to GB / T 13174-2021 "Determination of Detergency and Cycle Washing Performance of Detergents for Clothing", the washing water is 250mg / kg CaCl2 hard water, and the test cloth pieces are national standard carbon black JB-01 dirty cloth, national standard protein JB-02 dirty cloth, and national standard sebum JB-03 dirty cloth. Using 0.2% standard laundry detergent as a control, the decontamination ratio Pi is obtained. The test results are shown in Tables 1-1, 1-2, 1-3 and 1-4 respectively.

[0179] When Pi≥1.0, it is qualified, and when Pi<1.0, it is unqualified.

[0180]

[0181] ΔA is the whiteness difference before and after washing the test piece with the laundry tablet

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

[0183] Table 1-1 Difference in decontamination ratio with laundry tablets without enzymes (laundry tablet concentration is 0.2%)

[0184]

[0185] Comparative Example 1-2 uses an enzyme preparation and sodium dodecyl sulfate at the same time. According to the test results in Table 1-1, compared with Example 1, the decontamination ability of the enzyme preparation cannot be fully exerted, and Comparative Example 1-2 destroys the coordination of anionic surfactants, nonionic surfactants, and film-forming agents, and the decontamination ability is significantly reduced. The chelating agent used in Example 1 is gluconic acid and sodium gluconate, and the decontamination ability of this combination is better than that of Comparative Example 3 using citric acid and sodium citrate. It is speculated that it may be because the chelating ability of gluconic acid and its salts is stronger than that of citric acid and its salts, which enhances the decontamination ability of the laundry tablet in hard water.

[0186] Table 1-2 Decontamination effect on the first day of storage at room temperature

[0187]

[0188] The laundry tablets of Comparative Examples 1 and 2 are added with SLS, so theoretically, their decontamination ability should be stronger than that of mild surfactants. However, due to the influence of SLS on the enzyme preparation, the decontamination ability of the enzyme preparation cannot be fully exerted, so the decontamination effect of Comparative Examples 1-2 is far inferior to that of Examples 1-3.

[0189] Table 1-3 Decontamination effect on the third day of storage at room temperature

[0190]

[0191] Table 1-4 Decontamination effect on the 7th day of storage at room temperature

[0192]

[0193] According to the test data in Table 1, the laundry tablets of Examples 1-3 all showed strong decontamination ability in the tests of storage for 1, 3, and 7 days.

[0194] Test 2: Moisture resistance

[0195] Place a box of detergent tablets (with detergent tablets stacked up and down) in a test environment with a temperature of (25±2)°C and a relative humidity of (85±5)%. Repeat 4 groups. Take out one group at 24, 48, 72, and 96 hours respectively. Then separate the two detergent tablets and observe whether there is adhesion between the tablets. Record the results in Table 2.

[0196] Adhesion phenomena are divided into no adhesion (the pieces can be separated directly), slight adhesion (they can be separated by force and the adhesion surface is not damaged), obvious adhesion (some areas are directly stuck together and cannot be separated) and severe adhesion (they stick to each other and cannot be separated).

[0197] Table 2

[0198] Group Forming stability 24h 48h 72h 96h Example 1 Forming without breaking No adhesion No adhesion No adhesion No adhesion Example 2 Forming without breaking No adhesion No adhesion No adhesion No adhesion Example 3 Forming without breaking No adhesion No adhesion No adhesion No adhesion Example 4 Forming without breaking No adhesion No adhesion No adhesion No adhesion Example 5 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 1 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 2 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 3 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 4 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 5 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 6 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 7 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 8 Forming without breaking No adhesion No adhesion Slight adhesion Obvious adhesion Comparative Example 9 Forming without breaking No adhesion Slight adhesion Obvious adhesion Severe adhesion Comparative Example 10 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 11 Forming without breaking No adhesion No adhesion No adhesion No adhesion Comparative Example 12 Forming without breaking No adhesion No adhesion Slight adhesion Obvious adhesion Comparative Example 13 No shape - - - - Comparative Example 14 forming Slight adhesion Obvious adhesion Severe adhesion Severe adhesion Comparative Example 15 Forming without breaking No adhesion No adhesion Slight adhesion Obvious adhesion

[0199] According to the test data in Table 2, the laundry tablets of Examples 1-5 were formed without breaking, and showed excellent moisture resistance and high stability in 24, 48, 72 and 96 hours.

[0200] The adhesion phenomenon of the laundry tablets of Examples 1-3 at 24, 48, 72, and 96 hours is shown in Table 1. Figure 1 .

[0201] The adhesion phenomenon of the laundry tablets of comparative examples 8, 9, 12 and 14 at 24, 48, 72 and 96 hours is shown in Table 1. Figure 2 .

[0202] Test 3: Dryness resistance

[0203] According to QB / T5779-2023 "Laundry Tablets", place the detergent tablets in a test environment at a temperature of (55±2)°C, use an analytical balance to weigh the weight of the detergent tablets before and after the test, calculate the weight loss rate, and record the weight loss rate in Table 3.

[0204] A weight loss rate greater than 15.0% is unqualified, and a weight loss rate less than or equal to 15% is qualified.

[0205] At the same time, the morphology of the taken-out laundry tablets was observed and recorded in Table 3 as the molding stability.

[0206] Table 3

[0207] Group Forming stability Weight loss rate / % Qualification Example 1 whole 0.99 qualified Example 2 whole 1.05 qualified Example 3 whole 1.1 qualified Comparative Example 1 whole 1.15 qualified Comparative Example 2 whole 1.18 qualified Comparative Example 8 whole 2.02 qualified Comparative Example 9 Complete but with cracks 12.44 qualified Comparative Example 10 The slices are very brittle and broken into pieces 1.64 Failure Comparative Example 11 whole 1.32 qualified Comparative Example 12 whole 10.82 qualified Comparative Example 14 Fragments 20.29 Failure Comparative Example 15 whole 2.57 qualified

[0208] Although the laundry tablet of Comparative Example 10 has a low weight loss rate and is formed, it is not soft and has a brittle texture. After losing water, it is more likely to crack on the surface and is not resistant to drying and breaks into pieces, so it is judged to be unqualified.

[0209] Test 4: Solubility

[0210] According to QB / T5779-2023 "Laundry Tablets", fill a 1L beaker with 700mL of hard water (250mg / kg calcium chloride), place it in a (23±2)℃ water bath environment, adjust the stirring speed of the magnetic stirrer, cut the laundry tablets into 3cm*3cm square pieces, throw them vertically into the water 10cm parallel to the water surface, and start timing when the laundry tablets touch the water surface. Stop timing when the sample is completely dispersed in the water to obtain the dissolution time. Repeat 3 times in parallel.

[0211] The dissolution times are recorded in Table 4.

[0212] Table 4

[0213]

[0214]

[0215] Although the moisture resistance stability of Comparative Examples 10 and 11 is good, the dissolution time is long in the solubility test and the overall performance is poor.

[0216] Comparative Example 12 is a laundry tablet containing SLS, and Comparative Examples 13 and 14 are laundry tablets obtained by completely or partially replacing SLS with other anionic surfactants. When the SLS component is completely replaced (Comparative Example 13), the laundry tablet cannot be formed; when SLS is partially replaced (Comparative Example 14), although it can be formed, the wet and dry stability is poor. The laundry tablets are slightly adhered in a high humidity environment for 24 hours. In a dry environment at 55°C, the weight loss rate of the laundry tablets is greater than 15%, and they become uneven fragments, which are unqualified laundry tablets, indicating that SLS is a key component for the formation and stability of the laundry tablets. Simply replacing SLS with other surfactants cannot obtain qualified and stable laundry tablets.

[0217] However, after omitting SLS, the present application selects a specific system to prepare the tablets, and the obtained laundry tablets dissolve quickly, have good moisture and dry resistance, and have good decontamination effect, and have good development prospects.

[0218] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such 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, characterized in that: The slurry is prepared by drying; the slurry includes the following raw materials according to weight percentage: 10%-40% film former, 15%-40% anionic surfactant, 2%-12% nonionic surfactant, 0.5%-5% chelating agent, 0.4%-4% enzyme preparation, 0.5%-5% auxiliary agent, and 0.1%-1% flavor; The film-forming agent comprises a film-forming agent A and a film-forming agent B, wherein the film-forming agent A is polyvinyl alcohol, and the film-forming agent B comprises at least one of cellulose and dodecenyl succinate starch ester; the weight ratio of the film-forming agent A to the film-forming agent B is (2-15):1; The anionic surfactant includes at least two of sodium α-olefin sulfonate, sodium fatty acid methyl ester sulfonate, and sodium isethionate; 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; The chelating agent includes at least one of gluconic acid and its salts, glutamic acid diacetic acid and its salts, methylglycine diacetic acid and its salts, aspartic acid diacetic acid and its salts.

2. The laundry tablet according to claim 1, characterized in that: The film-forming agents are film-forming agent A and film-forming agent B, wherein the film-forming agent A is polyvinyl alcohol, and the film-forming agent B is cellulose; The anionic surfactant is sodium α-olefin sulfonate and sodium fatty acid methyl ester sulfonate.

3. The laundry tablet according to claim 2, characterized in that: According to the weight percentage of the slurry, the polyvinyl alcohol accounts for 10-26%, the cellulose accounts for 1-5%, the sodium α-olefin sulfonate accounts for 15-25%, and the sodium fatty acid methyl ester sulfonate accounts for 5-15%.

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

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

6. The laundry tablet according to claim 1, characterized in that: The slurry also includes 0-25% filler.

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

8. The laundry tablet 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 tablet according to claim 1, characterized in that: The auxiliary agent includes at least one of glycerol, propylene glycol and glucitol.

10. A method for preparing a laundry tablet according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Mix film former A with water at 75-85°C until the material swells and dissolves completely; Step 2: Add film-forming agent B and continue stirring until fully dissolved; Step 3: Add chelating agent, anionic surfactant and nonionic surfactant and dissolve for 15-60 minutes; Step 4: adding the remaining raw materials at 40-45° C. to obtain a slurry; Step 5: Dry the slurry, shape it into tablets, and obtain laundry tablets without SLS surfactant.

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