Laundry sheet with cleaning, stain-removing, color-protecting and color-absorbing functions and preparation method thereof

Abstract

The invention discloses a laundry sheet with cleaning, stain-removing, color-protecting and color-absorbing functions and a preparation method thereof. The laundry sheet is prepared by dipping a cation modified non-woven fabric in a functional material body and then drying the cation modified non-woven fabric, the functional material body is prepared from the following raw material components in parts by total mass of the functional material body: 20 to 45 parts of a surfactant, 0.05 to 2 parts of an odor neutralizer, 0.05 to 2 parts of organic acid, 0.05 to 1 part of a pH regulator, 0.05 to 2 parts of a cationic polymer, 0.05 to 8 parts of an additive and 50 to 85 parts of water. The laundry sheet provided by the invention has the functions of cleaning, stain removal, color protection and color absorption, and can effectively eliminate peculiar smell released by the cation modified non-woven fabric color absorption sheet on the inner layer.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of washing products, and relates to a color absorption sheet and a detergent, in particular to a novel laundry sheet with cleaning and color protection functions, which is a combination of a detergent and a cation-modified non-woven fabric color absorption sheet. BACKGROUND

[0002] Laundry sheets are innovative products that differ from conventional solid powder and liquid detergents. The solid sheet form has the advantages of portability and high active content. The mainstream laundry sheet products on the market are still made of starch or polyvinyl alcohol film agent, combined with surfactants, silicon dioxide, polyols and other raw materials to form the core structure of the laundry sheet. However, such laundry sheets have a complicated processing process involving granulation and film formation. Moreover, due to the limitations of the processing conditions, the functions of the laundry sheet products are relatively single.

[0003] With the increasing demand of consumers for washing products, the mainstream detergent products on the market have evolved various special functions, such as color protection and anti-color bleeding, enzyme cleaning, sterilization and antibacterial, long-lasting fragrance, etc. However, as can be seen from the composition of laundry liquid, the highest proportion in the product is water, which leads to high transportation cost and poor portability of laundry liquid products.

[0004] With the development of the concentration trend of liquid detergents, combining the diversified special functions of laundry liquid products with the concentrated and convenient laundry sheet products is an innovative trend in the future. For example, patent CN 107312645B proposes a laundry sheet containing active oxygen, which has multiple functions such as stain removal, sterilization and odor removal; patent CN 106811329B proposes an antibacterial and anti-mite laundry sheet; and patent CN 106916659B proposes a multi-layer laundry sheet with multiple washing functions. However, the main composition of these laundry sheets still needs to use starch or polyvinyl alcohol film agent to ensure the formation of the laundry sheet. More innovative laundry sheet products, such as utility model patent CN 208454915U, propose a multifunctional laundry color absorption sheet, which presses the laundry sheet film layer, plant anti-mite element and color absorption cloth base together; and patent CN 117821173A proposes a laundry sheet with color absorption function by adhering and extruding two laundry sheets with laundry functions and a color protection microcapsule layer. The above laundry sheets all use color absorption cloth layers or cationic color protection microcapsules as the support for the color protection function of the laundry sheet. However, the present application found that the cationic modifier used in the color absorption cloth layer and the color protection microcapsule has the disadvantage of slowly releasing free trimethylamine. This has been found in commercially available products of the same type of anti-color bleeding color absorption sheet and laundry color absorption sheet, and many consumers have also feedback that they can smell a certain degree of unpleasant odor when the product is opened, which greatly reduces the use experience of consumers. SUMMARY

[0005] The technical problem solved by the present application is to provide a laundry tablet with clean stain removal and color protection functions and a preparation method thereof, which can effectively improve the stain removal performance and color protection effect of the laundry tablet product, effectively eliminate the problem of trimethylamine odor released by cationic modified non-woven fabric, and significantly improve the daily use experience of consumers.

[0006] To solve the above problems, the present application provides the following technical solutions: In a first aspect, the present application provides a laundry tablet with clean stain removal and color protection functions, which is prepared by impregnating a functional material body with cationic modified non-woven fabric and then drying. Surfactant 20-45 parts; Odor neutralizer 0.05-2 parts; Organic acid 0.05-2 parts; pH adjuster 0.05-1 parts; Cationic polymer 0.05-2 parts; Additive 0.05-8 parts; Water 50-85 parts.

[0007] As a preferred embodiment of the present application, the surfactant is selected from one or more of anionic surfactants, nonionic surfactants and amphoteric surfactants.

[0008] Preferably, when the surfactant includes anionic surfactants and nonionic surfactants, the mass ratio of the anionic surfactants to the nonionic surfactants is (2-4):1.

[0009] Preferably, when the surfactant includes nonionic surfactants and amphoteric surfactants, the mass ratio of the nonionic surfactants to the amphoteric surfactants is (3-8):1.

[0010] Preferably, when the surfactant includes anionic surfactants, nonionic surfactants and amphoteric surfactants, the mass ratio of the anionic surfactants, nonionic surfactants and amphoteric surfactants is (12-18):(4-6):1.

[0011] The anionic surfactant is selected from one or more of alkyl benzene sulfonate, lauryl alcohol sulfate, fatty alcohol polyoxyethylene ether sulfate, fatty acid methyl ester sulfonate, and fatty acid salt.

[0012] The nonionic surfactant is selected from one or more of fatty alcohol alkoxylates, alkyl polyglycosides, fatty acid alkoxylates, fatty acid ethoxylates, fatty acid alkylol amides, ethoxylated sorbitan esters.

[0013] The amphoteric surfactant is selected from one or more of lauryl amidopropyl betaine, cocamidopropyl betaine, lauryl dimethyl amine oxide, disodium cocoamphodiacetate.

[0014] The cationic modified non-woven fabric is prepared by modifying the non-woven fabric with a cationic modifier selected from one or more of quaternary ammonium salts, amine salts, and cationic starches; and the non-woven fabric is made of one or more of cellulose fibers, cotton fibers, polyester fibers, polypropylene fibers, viscose fibers, and polyolefin fibers (ES fibers). The modification treatment is to immerse the non-woven fabric in the cationic modifier under alkaline conditions for 3-5 hours and then dry. Preferably, the immersion time is 4 hours.

[0015] Preferably, the cationic modified non-woven fabric is prepared by mixing viscose fibers modified by the cationic modifier under alkaline conditions with polyolefin fibers and then processing the mixture into a non-woven fabric by a hydroentangling process.

[0016] The odor neutralizer is selected from one or more of zinc ricinoleate, zinc lactate, zinc acetate, zinc citrate, and cyclodextrin.

[0017] The organic acid is selected from one or more of linear alkylbenzenesulfonic acid, citric acid, succinic acid, gallic acid, lactic acid, stearic acid, oleic acid, and lauric acid.

[0018] The cationic polymer is at least one of polyvinylpyrrolidone polymers, copolymers of N-vinylpyrrolidone and N-vinylimidazole, polyvinylpyrrolidone-vinyl acetate copolymers, and sodium carboxymethylcellulose.

[0019] The additive is selected from one or more of enzyme preparations, bacteriostatic agents, softening agents, preservatives, fragrances, suspension aids, microcapsule fragrances, and washing aids.

[0020] In a second aspect, the present application also provides a method for preparing the laundry tablet having both cleaning and color protection functions, which comprises the following steps: S1, preparing a functional material: mix 50-70 parts of water and 20-45 parts of surfactant, and stir until the surfactant is completely dissolved; add a pH adjuster to adjust the pH to 7.5-9, and then add an odor neutralizer, a cationic polymer, and an additive, and stir until they are completely dispersed; add an organic acid to control the pH to 6-8, and then add the remaining water and stir until the appearance is uniform, to obtain a functional material; S2, immerse the cationic modified non-woven fabric in the functional material body for 0.1-10 minutes, and then take it out, squeeze and dry, to obtain the laundry tablet with the functions of cleaning, stain removal, color protection and color absorption.

[0021] Preferably, the drying is drying at 85-130℃ for 1-30 minutes.

[0022] Preferably, the step S2 further comprises the steps of cutting and packaging the dried laundry tablet.

[0023] Compared with the prior art, the present application can achieve the following technical effects: 1. The present application can improve the capture efficiency of the product on the dye components falling off in the fabric washing process through the joint action of the cationic polymer and the cationic modified non-woven fabric, and significantly improve the color protection and anti-color bleeding functions of the product. 2. The present application can effectively eliminate the slow-release trimethylamine odor of the cationic modified non-woven fabric color absorption sheet of the product, and improve the fragrance performance of the product itself. 3. The laundry tablet of the present application has high concentration and low water content, which significantly improves the transportation convenience. DETAILED DESCRIPTION

[0024] The present application is further described below through specific embodiments, and any appropriate improvement and function replacement of the present application within the scope of the present application are considered to be included in the scope of the present application.

[0025] Unless otherwise specified, all percentages, fractions and ratios are calculated based on the total weight of the composition of the present application. Unless otherwise indicated, all weights of the listed ingredients are calculated based on the active content, so they do not include the solvent or by-products that may be contained in the commercially available materials. The term "weight content" in this paper can be represented by the symbol "%".

[0026] Unless otherwise indicated, all formulations and tests herein occur in an environment of 25℃.

[0027] In this paper, "including", "containing", "comprising", "having", or other variants are intended to cover non-closed inclusion, and there is no distinction between these terms. The term "comprising" means that other steps and ingredients can be added without affecting the final result. The term "comprising" also includes the terms "consisting of" and "consisting essentially of". The composition and method / process of the present application can comprise, consist of and consist essentially of the essential elements and limiting terms described herein and any additional or optional ingredients, components, steps or limiting terms described herein.

[0028] The commercial products mentioned in this paper are only illustrative and do not constitute a limitation on the source of raw materials of the present application.

[0029] The laundry tablet with the functions of cleaning and removing stains and protecting color and absorbing color is prepared by using the cationic modified non-woven fabric as the carrier, dipping and rolling the carrier in the specific functional material, and then drying the carrier at high temperature.

[0030] In the form of the laundry tablet, the laundry tablet product obtained by the present application comprises the following components: 45-75 parts of surfactant; 15-30 parts of cationic modified non-woven fabric 0.01-3 parts of odor neutralizer; 0.01-3 parts of organic acid; 0.01-2 parts of pH regulator; 0.01-3 parts of cationic polymer; 0.01-10 parts of additive.

[0031] In the specific functional material, the raw materials of the functional material comprise the following components 20-45 parts of surfactant; 0.05-2 parts of odor neutralizer; 0.05-2 parts of organic acid; 0.05-1 part of pH regulator 0.05-2 parts of cationic polymer; 0.05-8 parts of additive; 50-85 parts of water Surfactants The suitable surfactant is selected from one or more of anionic surfactant, nonionic surfactant and amphoteric surfactant. Preferably, the surfactant system comprises anionic surfactant and non-anionic surfactant, preferably compounded in a weight ratio of 2-4:1. In some cases, a weight ratio of at least 3:1 of anionic surfactant to nonionic surfactant is preferred. Further preferred surfactant system comprises anionic surfactant, nonionic surfactant and amphoteric surfactant in a weight ratio of 12-18:4-6:1.

[0032] Anionic surfactants The anionic surfactant is selected from a mixture of one or more of sulfonate surfactant, carboxylate surfactant and sulfate surfactant; preferably selected from a mixture of one or more of alkyl benzene sulfonate, C8 to C18 alkyl sulfate, C8 to C18 ethoxylated fatty alcohol sulfate, alpha-olefin sulfonate, fatty acid alkyl sulfonate, ethoxylated fatty alcohol ether carboxylate.

[0033] In some embodiments, the mixture of anionic surfactants preferably contains an alkyl benzene sulfonate and derivatives thereof. The alkyl benzene sulfonate satisfies the following general formula: where R1is an alkyl group having a carbon number of 6 to 24, and M+is a cation such as a sodium ion, a potassium ion, an ammonium ion, and the like. R1may be a linear alkyl group or a branched alkyl group; it can be a saturated alkyl group or an alkyl group containing one or more unsaturated double bonds. Further preferably, R1is a linear alkyl group having a carbon number of 8 to 18. A preferred alkyl benzene sulfonate is sodium dodecyl benzene sulfonate.

[0034] In some embodiments, the mixture of anionic surfactants contains an ethoxylated fatty alcohol sulfate. The ethoxylated fatty alcohol sulfate is a derivative of an ethoxylate fatty alcohol, having the following general formula: where R1is an alkyl group having a carbon number of 6 to 24, and x is 0.5 to 30, and where M+is a cation such as a sodium ion, a potassium ion, an ammonium ion, and the like. R1may be a linear alkyl group or a branched alkyl group; it can be a saturated alkyl group or an alkyl group containing one or more unsaturated double bonds. Preferably, R1is a linear alkyl group having a carbon number of 8 to 18. x represents the average degree of ethoxylation, which is 0.5 to 30, preferably 0.5 to 10, and more preferably 0.5 to 3.

[0035] In some embodiments, the mixture of anionic surfactants contains an alkyl sulfate, which can be a linear or branched alkyl group; it can be a saturated alkyl group or an alkyl group containing one or more unsaturated double bonds. Preferably, the alkyl sulfate has a carbon number of 6 to 24, and further preferably, the alkyl sulfate has a carbon number of 8 to 18. A preferred alkyl sulfate is sodium dodecyl sulfate.

[0036] In some embodiments, the mixture of anionic surfactants contains an alpha-olefin sulfonate, having the following general formula: where a is 0 to 2, R1is an alkyl group having a carbon number of 6 to 24, preferably R1is an alkyl group having a carbon number of 8 to 18, and M+is a cation such as a sodium ion, a potassium ion, an ammonium ion, and the like.

[0037] In some embodiments, the mixture of anionic surfactants contains a fatty acid salt, preferably a fatty acid salt having a carbon number of 8 to 18. The alkyl segment of the fatty acid can be straight chain or branched, saturated alkyl or alkyl containing one or more unsaturated double bonds. The fatty acid salt can be a single component or a mixture of components of various fatty acids. Suitable examples are sodium oleate, sodium laurate. The fatty acid salt also includes ethoxylated fatty alcohol ether carboxylate, the fatty alcohol preferably having a carbon number of 8 to 18 and the average degree of ethoxylation preferably being 2 to 10.

[0038] In some embodiments, the mixture of anionic surfactants can also contain one or more of sodium alkyl disulfonate or derivatives thereof, preferably sodium alkyl diphenyl ether disulfonate, and preferably the sodium alkyl diphenyl ether disulfonate is sodium dodecyl diphenyl ether disulfonate.

[0039] In some embodiments, the mixture of anionic surfactants can also contain a fatty acid alkyl ester sulfate, preferably a fatty acid methyl ester sulfate (MES), the fatty acid preferably having a carbon number of 8 to 18.

[0040] In some embodiments, the mixture of anionic surfactants can also contain a sulfosuccinate, preferably a fatty alcohol polyoxyethylene ether sulfosuccinate disodium salt, the fatty alcohol preferably having a carbon number of 8 to 18 and the average degree of ethoxylation preferably being 2.0.

[0041] Nonionic surfactants The nonionic surfactant is selected from a mixture of one or more of fatty alcohol alkoxylate, alkyl polyglycoside, fatty acid alkoxylate, fatty acid ethoxylate, fatty acid alkylol amide, ethoxylated sorbitan ester.

[0042] In some embodiments, the mixture of nonionic surfactants preferably contains a fatty alcohol alkoxylate having the general formula: wherein n is 6 to 24; x is 0.5 to 30, and y is 0 to 10.

[0043] The fatty alcohol alkoxylate is a product of the ring opening polymerization of a fatty alcohol and an alkylene oxide in the presence of a basic catalyst and is essentially a mixture. The fatty alcohol includes a straight chain alcohol or a branched isomeric alcohol. The alkoxyl group includes an ethoxyl group and a propoxyl group. The fatty alcohol is preferably a fatty alcohol having a carbon number of 8 to 18, and preferred alcohols include, but are not limited to, one or a mixture of more than one of hexanol, octanol, decanol, 2-ethylhexanol, 3-propylheptanol, lauryl alcohol, isotridecanol, tridecanol, tetradecanol, hexadecanol, palm oil alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, linoleyl alcohol, and linolenyl alcohol. The average degree of ethoxylation x is preferably 2 to 12. Preferred fatty alcohol alkoxylates are the NEODOL series of straight chain fatty alcohol ethoxylate products of SHELL, the ECOSURF EH series of ethoxylated and propoxylated 2-ethylhexanol products of DOW, the Lutensol XL series of ethoxylated and propoxylated 3-propylheptanol products of BASF, the Lutensol TO series of ethoxylated isomeric tridecanol products of BASF, and the Lutensol XP series of ethoxylated 3-propylheptanol products of BASF.

[0044] In some embodiments, the nonionic surfactant mixture preferably contains an alkyl polyglycoside having the following general formula: wherein n is 6 to 24 and p is 1.1 to 3, preferably n is 8 to 16. Preferred alkyl polyglycosides are the Glucopon series of alkyl glycoside products of BASF.

[0045] In some embodiments, the nonionic surfactant mixture can contain a fatty acid alkoxylate, preferably an ethoxylated C8 to C18 fatty acid ester having an average degree of ethoxylation of 2 to 10.

[0046] In some embodiments, the nonionic surfactant mixture can contain an ethoxylated sorbitan alkyl ester having an alkyl carbon number of 6 to 18 and an average degree of ethoxylation of 4 to 20; preferred ethoxylated sorbitan alkyl esters are the Tween series of products of Corda.

[0047] In some embodiments, the nonionic surfactant mixture can contain a fatty acid alkylolamide, the fatty acid having a carbon number of 6 to 24, which can be a straight chain fatty acid or a branched fatty acid, which can be a saturated fatty acid or an unsaturated fatty acid; the alkylol number is 0 to 2. Preferred is a mono-, di- or isopropanolamide of a fatty acid having a carbon number of 8 to 18, and a preferred fatty acid alkylolamide is coconut oil acid diethanolamide.

[0048] In some embodiments, the nonionic surfactant mixture can contain fatty acid methyl ester ethoxylate, having the general formula: wherein n is from 6 to 24; x is from 2 to 20, preferably n is from 8 to 18, x is from 0.5 to 30. Preferably x is from 4 to 10. A preferred fatty acid methyl ester ethoxylate is MEE product by LION (trade mark OA-100M-95).

[0049] In some embodiments, the nonionic surfactant mixture can contain polyether surfactant. Polyether surfactant is a polymer, nonionic surfactant containing repeating units of ethylene oxide and / or propylene oxide, preferred polyether surfactant is Pluronic series product by BASF.

[0050] Amphoteric surfactants The zwitterionic surfactant is selected from at least one of betaine surfactant, imidazoline surfactant, amino acid surfactant, amine oxide surfactant; including but not limited to: alkyl betaine, fatty amido betaine, fatty amido propyl betaine, fatty amido propyl hydroxypropyl sulfobetaine, sodium alkyl acetate imidazoline, fatty acid imidazoline, sulfonic acid imidazoline, amino propionic acid derivative, glycine derivative, alkyl dimethyl amine oxide, fatty amido propyl dimethyl amine oxide, etc.

[0051] Cationic modified nonwoven The cationic modified nonwoven fabric relates to the processing and preparation links of cationic modifier and nonwoven fabric. Commercialized cationic modified nonwoven fabric is very common, that is, commercialized color absorption sheet product. For the cationic modifier, quaternary ammonium salt, amine salt, cationic starch can be selected, and the preferred cationic modifier includes one or more of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, 2,3-epoxypropyl trimethyl ammonium chloride, and polyepoxy chloropropane amine. For the nonwoven fabric, the fiber material is preferably one or more of cellulose fiber, cotton fiber, polyester fiber, polypropylene fiber, viscose fiber, and polyolefin fiber. In the following examples, the cationic modified nonwoven fabric is prepared by impregnating viscose fiber in the cationic modifier under alkaline conditions for 4 hours, drying, and then mixing with polyolefin fiber, and using a water jet process.

[0052] Cationic polymers The cationic polymer includes one or more of polyvinylpyrrolidone, polyvinylpyridine oxide, polyvinylpyrrolidone / vinyl acetate copolymer, and optionally includes imidazoline type cation, cationic cellulose, polyvinylpyrrolidone and vinyl imidazole copolymer HP66K, quaternary ammonium salt type, and cationic homopolymer and copolymer formed by polymerization of cationic monomer.

[0053] The laundry tablet according to the present application comprises 0.1-3 parts of a cationic polymer; the cationic polymer has a general structure of and wherein is a cationic structural unit, wherein a, b are both positive integers; the structural unit in the cationic polymer is selected from at least one of ,

[0054] the cationic structural unit in the cationic polymer is selected from a compound conforming to the following general formula: wherein R1 is selected from at least one of C n H 2n+1 , C m H 2m-1 , (CH2CH2O) v H, phenyl or naphthyl, n is 0-4, m is 5-8, and v is 1-3; R2 is selected from at least one of C n H 2n+1 , C m H 2m-1 , (CH2CH2O) v H, phenyl or naphthyl, n is 0-4, m is 5-8, and v is 1-3; X is selected from at least one of OH, Cl, Br or CH3OSO3.

[0055] Malodor neutralizers ​The laundry tablet product of the present invention contains a second layer of cationic modified nonwoven fabric color absorbing sheet. The cationic modifier may cause a trimethylamine odor release problem. In the specific embodiments of the present invention, 0.01-3 parts of an odor neutralizer is used to inhibit the trimethylamine odor. The odor neutralizer is selected from one or more of zinc ricinoleate, zinc lactate, cyclodextrin and its derivatives, probiotic derivatives. The proportion of the odor neutralizer in the functional material body is 0.05%-2%, preferably 0.1%-1%; the proportion in the laundry tablet is 0.01%-3%, preferably 0.1%-2%.

[0056] Organic acids The laundry tablet of the present invention contains an organic acid to neutralize the free trimethylamine odor component of the cationic modifier release inhibition. The organic acid is selected from one or more of linear alkyl benzene sulfonic acid, citric acid, succinic acid, gallic acid, lactic acid, stearic acid, oleic acid, lauric acid. The proportion of the organic acid in the functional material body is 0.05%-2%, preferably 0.1%-1%; the proportion in the laundry tablet is 0.01%-3%, preferably 0.1%-2%.

[0057] pH adjusters The laundry tablet of the present invention contains a pH regulator to neutralize the basic component in the system with the acid group of the organic acid or inorganic acid, or to neutralize the acidic component in the system with the basic group of the organic base or inorganic base, to control the pH of the system to a suitable range. The pH regulator includes one or more of citric acid, lactic acid, hydrochloric acid, malic acid, triethanolamine, sodium hydroxide, arginine, sodium bicarbonate. The proportion of the pH regulator in the functional material body is 0.05%-1%; the proportion in the laundry tablet is 0.01%-2%.

[0058] Perfumes The laundry tablet of the present invention can contain a fragrance, which contains all suitable fragrance components for washing products. The fragrance used in the present invention can be of natural origin, or can be a chemical synthetic product, or a mixture of the two. Preferred fragrances are lemon, rose, jasmine, lavender, citrus, green, woody, etc. The proportion of the fragrance in the functional material body is 0.1%-5%, preferably 0.1%-3%.

[0059] Microencapsulated perfumes The laundry tablet of the present application can contain microcapsule perfume, which contains all the microcapsule perfume ingredients suitable for washing products. The microcapsule wall material can be a water-soluble polymer material, including but not limited to one or more of sodium alginate, modified chitosan, modified cellulose, polyurethane, polyurea, melamine resin, urea-formaldehyde resin, and the core material can be an oil-soluble raw material, including but not limited to synthetic perfume, plant essential oil. The proportion of the microcapsule perfume in the functional material body is 0.1%-5%, preferably 0.2%-3%.

[0060] Additives The laundry tablet of the present application can contain various additives, including enzyme preparation, bacteriostatic agent, softener, preservative, perfume, suspension aid, microcapsule perfume, and washing aid.

[0061] Enzyme formulations The laundry tablet of the present application can contain one or more enzyme preparations to improve the stain removal effect during fabric washing and the care effect on fabric. The enzyme preparation contains one or more of protease, cellulase, amylase, lipase, phospholipase, and mannanase. Preferably, the enzyme preparation is protease, lipase, and amylase. The proportion of the enzyme preparation in the functional material body is 0.1%-5%, preferably 0.1%-3%.

[0062] Bacteriostats The laundry tablet of the present application can contain a bacteriostatic agent to inhibit and eliminate residual bacteria on the fabric. The bacteriostatic agent includes one or more of chemical synthesis bacteriostatic agent and natural source bacteriostatic agent, such as p-chloro-m-dimethylphenol, dichlorophen, triclosan, polyhexamethylene biguanide, tea tree oil, eucalyptus oil, and inorganic metal silver ion bacteriostatic agent. Preferably, the bacteriostatic agent is p-chloro-m-dimethylphenol, dichlorophen, triclosan, and tea tree oil. The proportion of the bacteriostatic agent in the functional material body is 0.01%-3%, preferably 0.01%-2%.

[0063] Softeners The laundry tablet of the present application can contain a softener to improve the soft and smooth touch of the fabric after washing. The softener includes one or more of amino silicone oil, polyether silicone oil, fatty acid ester, polyol ester, glycerol ester, and fatty acid glucose amide. Preferably, the softener is polyether silicone oil, fatty acid ester, and glycerol ester. The proportion of the softener in the functional material body is 0.01%-5%, preferably 0.1%-3%.

[0064] Preservatives The laundry tablet product provided by the present application has extremely low water content, and is free of microbial proliferation and antiseptic risk in the form of a laundry tablet product. However, considering that the functional material body still contains a large amount of water as a solvent in the product processing process, the addition of an antiseptic greatly guarantees the microbial safety in the production process. Suitable and optional antiseptics include at least one of phenoxyethanol, sodium benzoate, isothiazolinone and derivatives thereof, such as methylisothiazolinone, methylchloroisothiazolinone, benzisothiazolinone, or a mixture thereof. The proportion of the antiseptic in the functional material body is 0.01%-2%, preferably 0.01%-1%.

[0065] Suspending aids The laundry tablet provided by the present application can contain a suspension aid, which is used to stabilize the microcapsule perfume in the functional material body in the form of a link, so as to avoid the aggregation of the microcapsule perfume and cause uneven dispersion. The optional suspension aid includes one or more of bacterial fibers, microcrystalline cellulose, hydrogenated castor oil and derivatives thereof, polyacrylic acid, and acrylic acid and acrylic acid alkyl ester copolymer. The preferred suspension aid is Carbopol series products of Lubrizol.

[0066] Detergency builders The laundry tablet provided by the present application can contain a washing aid, which includes a hard water softener, an anti-redeposition agent, and a fluorescent whitening agent.

[0067] Hard water softeners Considering the difference in water quality in different regions, the content of metal ions in tap water is different, and the addition of a hard water softener is very necessary, which can effectively reduce the content of free calcium and magnesium ions in tap water and improve the cleaning effect of enzyme preparations and surfactants. The components used as the hard water softener can be selected from ethylenediaminetetraacetate, alanine diacetate, glutamic acid diacetate, sodium citrate, and mixtures thereof. The proportion of the hard water softener in the functional material body is 0.1%-5%, preferably 0.1-3%.

[0068] Anti-redeposition agents In order to improve the cleaning effect of laundry washing by the laundry tablet, an anti-redeposition agent can be contained in the laundry tablet provided by the present application. The anti-redeposition agent includes but is not limited to the following compounds: cellulose derivatives such as carboxymethyl cellulose, ethyl hydroxyethyl cellulose, and methyl cellulose; polycarboxylates such as polyacrylate, polyacrylic acid polymaleic acid copolymer, and acrylic acid-acrylate-sulfonate copolymer. The proportion of the anti-redeposition agent in the functional material body is 0.1%-3%, preferably 0.5% to 2%.

[0069] Optical brighteners The use of optical brighteners in detergent products is well known in the art. Optical brighteners are present in the form of their alkali metal salts, most commonly sodium salts. Preferred optical brighteners include, but are not limited to, stilbene-based biphenyl compounds. A suitable example is 4,4'-bis(2-sulfonat sodium styryl) biphenyl, such as the product of BASF under the trade name of CBS-X. The optical brightener is present in the functional body at a level of 0-1%, preferably 0-0.3%.

[0070] Detergency testing method The stain removal ability in the present application refers to the removal ability of fabric detergent composition to different stains. The test is carried out according to the method of national standard GB / T 13174. Three kinds of stained cloths, carbon black, protein and sebum, are used, and the whiteness W1 of the three kinds of stained cloths before washing is measured by WSD-3U fluorescence whiteness meter. According to the standard of GB / T 13174, hard water with a hardness of 250 ppm is prepared, and RHLQ type vertical stain removal machine is used to complete one washing. The detergent addition amount is 2 g / L for ordinary type and 1 g / L for concentrated type. The washing time is 20 min, the washing temperature is 30℃, and the stirring speed is 120 r / min. The stained cloth after washing is rinsed, dried, and the whiteness W2 of the cloth after washing is tested by whiteness meter. The whiteness difference AW is calculated as follows: AW = W2-W1; wherein W2 is the whiteness after washing, and W1 is the whiteness before washing.

[0071] The stain removal ability of the sample detergent is compared with the stain removal ability of the national standard detergent, and the P value is calculated, P = AW sample / AW standard; AW sample is the whiteness difference of the stained cloth before and after washing with the sample detergent, and AW standard is the whiteness difference of the stained cloth before and after washing with the national standard detergent.

[0072] Stain removal ability evaluation standard The higher the P value is, the better the stain removal ability is. If P≥1, it is qualified, and if P<1, it is unqualified.

[0073] Color care and color pickup performance testing method The vertical stain removal machine and the national standard white cotton cloth are used to test the color protection and color absorption performance. The mixed dye diluent is used as the dye component falling off from the colored clothes, and the color difference between the white cotton cloth and the non-woven fabric of the inner layer of the laundry tablet before and after washing is tested by the color difference meter, so as to characterize the color protection performance of the laundry tablet and the color absorption performance of the color absorption sheet.

[0074] Mixed dye dilutions The preparation process of the mixed dye dilution solution is as follows: 1. Three dyes of Reactive Red 3BSN, Reactive Metanil Yellow B and Reactive Black WNN are mixed in a proportion of 1:1:1 to prepare a mixed solution of reactive dyes with a concentration of 100 mg / L using pure water, and the pH is adjusted to 12.0±0.1 using a 4 mol / L sodium hydroxide solution, and the solution is placed in a 70°C water bath for 6 hours; 2. Two dyes of Direct Spun Red Ruby D-BLL and Direct Spun Blue D-3GL are mixed in a proportion of 1:1 to prepare a mixed solution of direct dyes with a concentration of 100 mg / L using pure water; 3. The mixed solution of reactive dyes and the mixed solution of direct dyes are mixed in a proportion of 1:1, and the pH is adjusted to 8.0±0.1 using a 2 mol / L hydrochloric acid solution.

[0075] Color care performance test swatches The national standard white cotton cloth is boiled in water containing detergent for 30 minutes, washed with tap water, and then boiled in deionized water for 10 minutes. After drying and ironing, it is cut into a circular cloth piece with a diameter of 6 cm for standby use.

[0076] The same group of cloth pieces are overlapped, and the L, a, and b values before and after washing are read one by one using a color difference meter. Two points on each of the front and back surfaces are measured before and after washing, and the average of four measurements is taken as the L, a, and b values of the test piece before and after washing.

[0077] Color pickup performance test swatches The laundry tablet sample is first subjected to washing and multiple rinsing to remove the surface-loaded detergent components, obtaining the non-woven fabric color absorption sheet in the laundry tablet sample. After drying, it is cut into small pieces of 2 cm × 2 cm, and the L, a, and b values of the non-woven fabric color absorption sheet before washing are obtained by color difference meter testing.

[0078] Color care and color pickup performance wash test It is carried out in a vertical decontamination machine. The instrument is preheated to 30°C and stabilized for a period of time. The laundry tablet test sample (cut into small pieces of 2 cm × 2 cm for testing) and the standard detergent are respectively prepared into a certain concentration (unless otherwise specified, the standard detergent concentration is 0.2%, the ordinary type sample concentration is 0.2%, and the concentrated type sample is 0.1%) of test solution 1L, which is poured into the corresponding decontamination cylinder. The cylinder is placed in the corresponding position and the stirring impeller is installed. After starting stirring for 5 minutes, stop to make the detergent components on the surface of the laundry tablet sample completely dissolved.

[0079] Six pieces of tracer national standard white cotton cloth pieces with a diameter of 6 cm are placed in each cylinder, and the stirring is started for 2 minutes and then stopped to make the tracer cloth pieces fully contact with the detergent solution.

[0080] Add 20 mL of the prepared mixed dye solution to each cylinder, start stirring and keep the stirring speed at 120 r / min, and stop the washing process after 20 min.

[0081] The cotton and non-woven fabric samples are taken out from each cylinder respectively and placed in the inner barrel of the rinsing device, and manually spun for 15 s (the inner barrel rotates at about 1800 r / min). Then 1500 mL of tap water is added to the rinsing device for 30 s, and the rinsing is performed at a uniform speed in an alternating manner of 5 clockwise circles and 5 counterclockwise circles, and after the rinsing water is discharged, the sample is manually spun for 15 s. The above steps are repeated for a total of two times. After the rinsing is completed, the test sample is taken out and hung to dry at room temperature.

[0082] The color difference meter is used to measure the L, a and b values of the cotton and non-woven fabric samples after washing. The color difference values of each sample before and after washing are calculated in a one-to-one correspondence according to the color difference formula.

[0083] The average color difference values of the cotton and non-woven fabric samples before and after washing are denoted as ΔE 标 , and the average color difference values of the test sample group are denoted as ΔE 测 , and the average color difference values of the non-woven fabric samples before and after washing are denoted as ΔE 吸 .

[0084] Color protection and color absorption performance evaluation standard ∆E 标 The larger the value, the more serious the dyeing of the cotton sample after washing, and the standard detergent does not have color protection performance. The smaller the value, the less serious the dyeing of the cotton sample after washing, and the test sample has color protection performance. 测 The larger the value, the stronger the dye capturing performance of the non-woven fabric sample, and the non-woven fabric sample has color absorption performance. 吸 The larger the value, the stronger the dye capturing performance of the non-woven fabric sample, and the non-woven fabric sample has color absorption performance.

[0085] The specific evaluation standard is shown in Table 1.

[0086] Table 1 Evaluation standard of color protection and color absorption performance Product fragrance evaluation method The transparent PE self-sealing bag is used to evaluate the fragrance performance of the laundry tablet product under sealed conditions, to determine whether the laundry tablet product has a slow-release trimethylamine odor, and to judge the fragrance stability of the product.

[0087] The transparent PE self-sealing bag selects 12 silk 8.1 (17 cm x 25 cm) size, and the single laundry tablet sample is placed in the self-sealing bag. Half of the air in the self-sealing bag is squeezed out, the self-sealing bag is pinched tightly along the sealing strip to completely seal, and is placed in a room temperature environment for 48 h. Then the self-sealing bag is opened by the fragrance evaluation personnel, and whether the self-sealing bag has a trimethylamine odor is evaluated.

[0088] Stability testing method and evaluation criteria High temperature stability: the single laundry tablet is placed in a transparent sample bottle after sealing, taken out after being placed in a 45±2℃ environment for one month, restored to a room temperature 25±5℃ environment, the sample bottle is opened, the laundry tablet fragrance remains unchanged, has obvious fragrance, and no irritating odor is released. The surface of the laundry tablet has no discoloration and no precipitate, and is high temperature stability qualified. Otherwise, it is unqualified.

[0089] Normal temperature stability: the single laundry tablet is placed in a transparent sample bottle after sealing, taken out after being placed in a 25±5℃ environment for one month, the sample bottle is opened, the laundry tablet fragrance remains unchanged, has obvious fragrance, and no irritating odor is released. The normal temperature stability is qualified, otherwise it is unqualified.

[0090] Aging performance stability: the single laundry tablet is placed in a transparent sample bottle after sealing, taken out after being placed in a 37±2℃ environment for two months, restored to a room temperature 25±5℃ environment, the sample bottle is opened, the surface of the laundry tablet has no discoloration and no precipitate, and the stain removal performance and color protection performance evaluation can be qualified. The aging stability is qualified, otherwise it is unqualified.

[0091] Performance testing experiments The laundry tablet with cleaning and stain removal and color protection and color absorption functions disclosed in the application is prepared by various methods known to those skilled in the art. The preparation of the composition can be carried out by conventional means, and the appropriate processing temperature and processing time should be selected according to the state and effect of the components in the solution, and the stability of the components.

[0092] Without further elaboration, it is believed that one skilled in the art can, using the preceding description, utilize the present application to its fullest extent. The following examples are included to further illustrate and teach the present application. However, the examples are not intended to limit the content of the present application in any manner.

[0093] In the following examples, all amounts are weight percent amounts, and the amounts listed for the ingredients are the amounts of active material, as converted.

[0094] Example 1 The laundry tablet with cleaning and stain removal and color protection and color absorption functions is prepared by impregnating a cationic modified non-woven fabric with a functional material body and then drying.

[0095] The raw materials of the functional material body include the following components in mass fraction: Surfactant: Fatty acid sodium salt 1 part; Fatty alcohol polyoxyethylene ether sodium sulfate 10 parts; Fatty alcohol polyoxyethylene ether (AEO9) 7 parts; Linear alkyl benzene sulfonic acid sodium 4 parts; Odor neutralizer: Zinc ricinoleate 0.5 parts; Organic acid: Linear alkyl benzene sulfonic acid 0.6 parts; pH regulator: 1 part; Cationic polymer: Polyvinylpyrrolidone 0.2 parts; Additive: Protease 0.1 part; Cellulase 0.1 part; Essence and microcapsule essence 0.8 parts, the mass ratio of essence and microcapsule essence is 5:3; Preservative: 0.01 parts; Suspension aid: 0.2 parts; Water: 74.49 parts.

[0096] The embodiment also provides a preparation method of the laundry tablet with the functions of cleaning, removing stains, protecting color and absorbing color, comprising the following steps: S1, preparing a functional material body: mixing 65 parts of water and all surfactants (fatty acid sodium salt, fatty alcohol polyoxyethylene ether sodium sulfate, fatty alcohol polyoxyethylene ether (AEO9), linear alkyl benzene sulfonic acid sodium) and stirring at a speed of 300 rpm until the surfactants are completely dissolved; adding a pH regulator to adjust the pH of the system to 8.5; then sequentially adding an odor neutralizer (zinc ricinoleate), a cationic polymer (polyvinylpyrrolidone), a protease, a cellulase, essence, microcapsule essence, a preservative and a suspension aid, and continuously stirring until all components are completely dispersed and uniform; finally, adding an organic acid (linear alkyl benzene sulfonic acid), accurately adjusting the pH of the system to 7.0, and adding the remaining water, and fully stirring until the appearance of the material body is uniform, to obtain the functional material body.

[0097] S2, forming a laundry tablet: cutting a cationic modified non-woven fabric (the material is cellulose fiber, which is treated by a quaternary ammonium salt cationic modifier) into a predetermined size, completely immersing it in the above-mentioned functional material body, and the immersion time is 2 minutes; after taking it out, extruding it through a roller device to control the liquid rate; finally, drying the immersed and rolled non-woven fabric tablet in a hot air circulating oven at 85°C to a constant weight, to obtain the laundry tablet with the functions of cleaning, removing stains, protecting color and absorbing color.

[0098] In the following examples, the specific proportions of each raw material in the functional material body are shown in Table 2.

[0099] Table 2 Raw material composition of the functional material body of the examples In order to facilitate the comparison of the influence of the proportion of each component in the functional material body, the performance of the laundry tablets is changed, the comparative examples are set as shown in the following Table 3 based on Example 1.

[0100] Table 3 Raw material composition of the functional material body of the comparative examples The raw materials in Table 2 and Table 3 are used to prepare laundry tablets according to the preparation method in Example 1 to obtain laundry tablets S1-S4 and laundry tablets D1-D9. As can be seen from the above table, Comparative Example 1 is a non-woven fabric without cation modification and does not contain a cationic polymer; Comparative Example 2 uses a cation-modified non-woven fabric but does not add a cationic polymer; Comparative Example 3 contains both a cation-modified non-woven fabric and a cationic polymer; Comparative Example 4 contains only a cationic polymer and uses a non-woven fabric without cation modification; and Comparative Example 5 further increases the proportion of the cationic polymer based on Comparative Example 3. Comparative Examples 1-5 mainly compare the influence of cation-modified non-woven fabric and cationic polymer on the color protection and color absorption performance of the laundry tablets, so no odor neutralizer, organic acid, fragrance, and microcapsule fragrance are added.

[0101] In order to illustrate the technical effects of the present application, the laundry tablets S1-S4 and laundry tablets D1-D9 prepared in the above examples and comparative examples are subjected to the following performance tests: (1) Color protection and color absorption performance test The laundry tablets prepared in Comparative Examples 1-5 and Example 1 are tested according to the color protection and color absorption performance test method, and the color change of the white cotton cloth and the color absorption sheet non-woven fabric in Table 1 is used to evaluate the color protection and color absorption performance of each comparative example, and the results are shown in Table 4.

[0102] Table 4 Results of color protection and color absorption performance test of laundry tablets As can be seen from Table 4, Comparative Example 1 has no color protection and color prevention effect and only has weak color absorption function; Comparative Example 4 increases the cationic polymer, and the color protection and color prevention effect is significantly improved; Comparative Examples 2 / 3 / 5 modify the non-woven fabric with cations, and the color absorption effect of the non-woven fabric is significantly improved; Example 1, Comparative Example 3, and Comparative Example 5 show that the cationic polymer and the cation-modified non-woven fabric have a synergistic effect, and the prepared laundry tablets have strong color protection and color absorption functions.

[0103] (2) Fragrance test The laundry tablets S1-S4 and laundry tablets D1-D9 were evaluated for release of laundry tablet unpleasant odor (trimethylamine off-note) according to the product fragrance evaluation test protocol, and the test results are shown in Table 5.

[0104] Table 5 Test results of laundry tablet fragrance at product stage As can be seen from Table 5, Comparative Example 1 does not contain fragrance, and the non-woven fabric color absorption sheet is not cation-modified, and the sample does not produce trimethylamine off-note; Comparative Example 2 uses a non-woven fabric color absorption sheet that is cation-modified, and the sample produces obvious off-note. It can be seen that cation-modified non-woven fabric color absorption sheets cause off-note. The fragrance evaluation results of Comparative Examples 3 and 4 further confirm that the off-note comes from the cation-modified non-woven fabric color absorption sheet. Comparative Example 5 adds fragrance, but the masking effect of the fragrance cannot solve the situation that the trimethylamine off-note is easily smelled at a low threshold. Comparative Examples 6, 7 and Examples 1-4 can effectively weaken the intensity of the trimethylamine off-note by using off-note neutralizing agents and organic acids alone to eliminate trimethylamine components, but the effect of the combination of the two is the best. Comparative Examples 8 and 9 further illustrate that the use of a large amount of off-note neutralizing agents or organic acids is not conducive to the performance of the fragrance aroma, and is easy to produce the sour taste of the off-note neutralizing agent raw material itself and the sour taste of the sample caused by excessive organic acid.

[0105] (3) Stain removal test The laundry tablets of Examples 1-4, Comparative Examples 1-6 and Comparative Example 9 were tested and evaluated according to the above stain removal test method, and the test results are shown in Table 6.

[0106] Table 6 Test results of national standard stain removal The laundry tablet product provided by the present application has a high active content. According to the test requirements of concentrated laundry liquid, the national standard stain removal test is carried out at a test concentration of 1 g / L. As can be seen from Table 6, Comparative Examples 1-3 all add protease and cellulase, and the national standard stain removal test results are qualified. The higher the test data, the better the stain removal performance. Comparative Example 5 does not add protease and cellulase, and the carbon black stain removal and protein stain removal values are significantly reduced, but still meet the minimum requirements for qualified stain removal. Comparative Examples 6 and Examples 1-4 increase the organic acid and the off-note neutralizing agent, which has no effect on the stain removal of the national standard stain, but the high proportion of organic acid added in Comparative Example 9 causes the pH of the sample aqueous solution to decrease significantly, which in turn causes the precipitation of fatty acid salts in the aqueous solution, which is not conducive to the stain removal efficiency of the sample.

[0107] (4) High temperature stability test According to the stability test protocol, the stability of the laundry tablet samples corresponding to Comparative Examples 5-9 was investigated, and the fragrance was evaluated, and the evaluation results are shown in Table 7.

[0108] Table 7 Test results of fragrance evaluation of laundry tablet samples The laundry tablet samples corresponding to Examples 1-4 and Comparative Examples 5-7 were subjected to high-temperature stability test at 45°C for one month, and the appearance of the samples was very stable, without discoloration or precipitates on the surface of the laundry tablets. The evaluation results for the fragrance showed that the laundry tablet of Comparative Example 5 was difficult to mask the free trimethylamine odor at room temperature, and after high-temperature storage, the laundry tablet continuously released free trimethylamine and gradually accumulated, and the odor became significantly stronger. In comparison, Comparative Example 6 added an odor neutralizer, and Comparative Example 7 added an organic acid, and the odor intensity was weakened; Examples 1-4 simultaneously added an odor neutralizer and an organic acid, and the odor disappeared, and the evaluators could hardly smell the odor, indicating that the combination of the two had a very significant effect on neutralizing and inhibiting free trimethylamine. Further tests on Comparative Example 8 and Comparative Example 9 found that when the odor neutralizer and the organic acid were used alone, the inhibitory effect on the odor of free trimethylamine was good, but there was an acid taste problem when the amount was increased, and especially when the organic acid was used in large amounts, it also had an adverse effect on the stability of the functional material body.

[0109] (5) Aging stability testing According to the stability test method and evaluation standard, the laundry tablet samples of each example and comparative example were subjected to aging stability test. After the aging test of the samples, the test data were as shown in Table 8.

[0110] Table 8 Test results after aging stability test Further aging performance stability test found that due to the decrease in enzyme activity stability, the decontamination power values of the aging samples on the national standard carbon black and protein stained cloth were reduced to a certain extent, but the decontamination power was still within the qualified level. As can be seen from Comparative Example 3 and Comparative Example 5, compared with the test results before aging, the aging samples had no obvious change in color protection and color transfer prevention performance on the national standard white cotton cloth, but the color absorption performance of the cationic modified non-woven fabric color absorption sheet was slightly decreased. As can be seen from the fragrance evaluation results of Comparative Examples 5-7, the intensity of the free trimethylamine odor in Comparative Example 2 and Comparative Example 3 was significantly increased relative to the laundry tablet at room temperature, and the odor intensity of Comparative Example 6 and Comparative Example 7 was not significantly increased, while Examples 1-4 could stably inhibit the generation of trimethylamine odor.

[0111] In summary, the laundry tablets of the embodiments of the present application have excellent performance in terms of detergency, stability, color protection and absorption, and trimethylamine odor inhibition. The comparative examples, due to the change of the technical scheme of the present application, have different degrees of decline in various performances. In particular, the odor intensity of some comparative examples significantly increases after aging, which affects the overall use experience of the product. In contrast, through scientific and reasonable formula design, the embodiments of the present application effectively stabilize the various performances of the laundry tablets. Even under aging conditions, the laundry tablets still maintain good detergency, color protection and absorption, and odor inhibition ability, thereby ensuring the long-term use effect of the product and the satisfaction of consumers.

[0112] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0113] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be construed as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A laundry tablet having both cleaning stain removal and color protection and color absorption functions, characterized in that, The laundry tablet is prepared by impregnating a cationic modified non-woven fabric with a functional material body and then drying; the raw materials of the functional material body, based on the total mass of the functional material body, include the following components: Surfactant 20-45 parts; Odor neutralizer 0.05-2 parts; Organic acid 0.05-2 parts; pH regulator 0.05-1 part; Cationic polymer 0.05-2 parts; Additive 0.05-8 parts; Water 50-85 parts.

2. The laundry tablet with the functions of clean stain removal and color protection and color absorption according to claim 1, characterized in that, The surfactant is selected from one or more of anionic surfactants, non-ionic surfactants and amphoteric surfactants; when the surfactant includes anionic surfactants and non-ionic surfactants, the mass ratio of the anionic surfactants to non-ionic surfactants is (2-4):1; when the surfactant includes non-ionic surfactants and amphoteric surfactants, the mass ratio of the non-ionic surfactants to amphoteric surfactants is (3-8):

1.

3. The laundry tablet with the functions of clean stain removal and color protection and color absorption according to claim 2, characterized in that, The anionic surfactants are selected from one or more of sulfonate surfactants, carboxylate surfactants and sulfate surfactants; the non-ionic surfactants are selected from one or more of fatty alcohol alkoxylates, alkyl polyglycosides, fatty acid alkoxylates, fatty acid ethoxylates, fatty acid alkylol amides and ethoxylated sorbitan esters; the amphoteric surfactants are selected from one or more of betaine surfactants, imidazoline surfactants, amino acid surfactants and amine oxide surfactants.

4. The laundry tablet with the functions of clean stain removal and color protection and color absorption according to claim 1, characterized in that, The cationic modified non-woven fabric is prepared by modifying the non-woven fabric with a cationic modifier, and the type of the cationic modifier is selected from one or more of quaternary ammonium salts, amine salts and cationic starches.

5. The laundry tablet with the functions of clean stain removal and color protection and color absorption according to claim 4, characterized in that, The material of the non-woven fabric is selected from one or more of cellulose fibers, cotton fibers, polyester fibers, polypropylene fibers, viscose fibers and polyolefin fibers.

6. The laundry tablet with the functions of clean stain removal and color protection and color absorption according to claim 1, characterized in that, The cationic polymer is selected from one or more of polyvinylpyrrolidone, polyvinylpyridine nitroxide, polyvinylpyrrolidone and vinyl acetate copolymer.

7. The laundry tablet with the functions of clean stain removal and color protection and color absorption according to claim 1, characterized in that, The odor neutralizer is selected from one or more of zinc ricinoleate, zinc lactate, cyclodextrin and its derivatives, and probiotic derivatives.

8. The laundry tablet with the functions of clean stain removal and color protection and color absorption according to claim 1, characterized in that, The organic acid is selected from one or more of linear alkylbenzenesulfonic acid, citric acid, succinic acid, gallic acid, lactic acid, stearic acid, oleic acid and lauric acid.

9. The laundry tablet with both cleaning and stain removal and color protection and color absorption functions according to claim 1, wherein the additive is selected from one or more of enzyme preparations, bacteriostatic agents, softening agents, preservatives, fragrances, suspension aids, microcapsule fragrances and washing aids.

10. A method for preparing the laundry tablet with the functions of clean stain removal and color protection according to any one of claims 1-9, characterized in that, The method comprises the following steps: S1, preparing a functional material body: mixing 50-70 parts of water and 20-45 parts of surfactant, and stirring until the surfactant is completely dissolved; adding a pH regulator to adjust the pH to 7.5-9, and then adding an odor neutralizer, a cationic polymer and an additive, and stirring until they are completely dispersed; adding an organic acid to control the pH to 6-8, and then adding the remaining water and stirring until the appearance is uniform to obtain the functional material body; S2, the cationic modified non-woven fabric is immersed in the functional material for 0.1-10 minutes, and then is squeezed and dried to obtain the laundry sheet with the functions of cleaning, stain removal, color protection and color absorption.

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