CN108130215B

CN108130215B - Low-viscosity liquid detergent composition with yield stress and preparation method thereof

Info

Publication number: CN108130215B
Application number: CN201711465843.9A
Authority: CN
Inventors: 高南; 李东华; 马玉杰; 邱振明; 王松营
Original assignee: Guangzhou Liby Enterprise Group Co Ltd
Current assignee: Guangzhou Liby Enterprise Group Co Ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2020-03-24
Anticipated expiration: 2037-12-28
Also published as: CN108130215A

Abstract

The invention discloses a low-viscosity liquid detergent composition with yield stress and a preparation method thereof. The total content of the surfactant in the composition is 3.0-40.0% by weight, and the composition comprises the following components: (1)3.0 to 15.0 percent of electrolyte; (2) 1.0-35.0% of anionic surfactant, wherein the anionic surfactant comprises 1.0-20.0% of aromatic anionic surfactant and 0.1-10.0% of fatty acid salt; (3)1.0 to 30.0% of a critical arrangement parameter P of 0.5 to 1.0 and A^b━ B; (4) 1.0-20.0% of a second nonionic surfactant with an HLB of 8-14 linear chain structure; (5)0.1 to 30.0 percent of auxiliary agent. The compositions disclosed herein have a relatively low viscosity, 20s^‑1A viscosity at shear rate of less than 1000 mpa-s; the yield stress of 0.05-2.0 Pa is within the temperature range of 25-45 ℃, and the suspension has excellent suspension effect on microcapsule particles, grease microemulsion and particle-size solid suspended matters; while maintaining excellent detergency.

Description

Low-viscosity liquid detergent composition with yield stress and preparation method thereof

Technical Field

The invention relates to a liquid detergent composition and a preparation method thereof, belongs to the technical field of daily chemical washing products, and particularly relates to a low-viscosity liquid detergent composition with yield stress and a preparation method thereof.

Background

With the progress of times and the improvement of living standard, daily chemicals become an indispensable part of the lives of consumers, and the consumers increasingly demand daily chemical products, so that the rapid development of the daily chemical industry is achieved. The liquid detergent is a detergent variety which is developed faster in the fabric care market at home and abroad in recent years, and in order to meet the requirement of market diversification, the liquid detergent no longer only meets the basic decontamination effect, and is also required to have the functional effects of softening, lasting fragrance, bacteriostasis, mite removal and the like.

At present, the effects of softening, lasting fragrance and bacteriostasis and mite removal of the liquid detergent are achieved by respectively introducing a softening agent, a microcapsule essence and a microcapsule antibacterial mite removal agent into a system. Because the softening agent, the microcapsule essence and the microcapsule antibacterial mite-killing agent have certain density difference with the matrix of the detergent, the problems of layering, sedimentation or floating up often occur in the system. Therefore, in order to solve the problem that the functional objects are layered, settled or floated in the liquid detergent, the identified patent CN103361197A proposes a laundry detergent for stably dispersing the microcapsule essence by using gel and a preparation process thereof, the patent mainly uses xanthan gum, gellan gum or hydroxymethyl cellulose CMC and other natural polymer gel suspending agents to suspend the microcapsule essence, and due to the action of polymer gel, on one hand, the amount of the suspending agent in the system is large, and on the other hand, the viscosity of the formed washing system is also very large, so that the cost of the product is high, and meanwhile, the product has poor pourability and water solubility, and cannot be generally accepted by consumers. Patent WO 2008/076693a2 uses a suspension stabilizer as a starting point, proposes that different Carbopol series of suspension agents have suspension stability to system suspension, such as Carbopol Aqua SF-1, Carbopol EZ-4 and Ultrez 10, and experiments prove that part of Carbopol systems have certain suspension stability at normal temperature, but suspension property of the system disappears at high temperature, and for high polymer with excellent suspension effect, the cost of the used polymer is higher, almost reaching the cost of the total surfactant in the system, and the viscosity of the system can also be increased sharply.

At present, the technical problems that the cost of a suspension effect liquid detergent is high and certain yield stress is formed mainly by adding a suspension aid and high viscosity exist in the daily chemical industry, and on one hand, the price of the suspension aid is generally high, the consumption of the aid is large, and the system price is high; on the other hand, the addition of the suspension aid can cause the viscosity and stability of the system to change, and cause incompatibility of the system.

Disclosure of Invention

In order to overcome the disadvantages of the prior art, the invention aims to provide a low-viscosity liquid detergent composition with yield stress, which is a low-viscosity liquid detergent with soft and smooth functionality and can stably suspend system suspended matters.

It is another object of the present invention to provide a method for preparing the above low viscosity liquid detergent composition having yield stress, which stably suspends the efficacy suspension of the liquid detergent by a simple and effective method to achieve higher yield stress of the system under the condition of relatively low viscosity; solves the phenomenon that the effective suspended matters in the system float or settle in the system, and finally endows the liquid detergent composition with the characteristics of relatively low viscosity, excellent suspension stability and specific functional action of the suspended matters.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a low-viscosity liquid detergent composition with yield stress, which comprises the following components in percentage by weight, wherein the total content of surfactants in the composition is 3.0-40.0 percent:

(1)3.0 to 15.0 percent of electrolyte;

(2) 1.0% to 35.0% of an anionic surfactant comprising: 1.0 to 20.0 percent of aromatic anionic surfactant; 0.1-10.0% of fatty acid salt, wherein the mass ratio of the saturated fatty acid salt to the unsaturated fatty acid salt is 1: 10-10: 1;

(3)1.0 to 30.0% of a critical arrangement parameter P (25 to 45 ℃) of 0.5 to 1.0 and A^b━ B structureA sex agent; a. the^bThe hydrophobic chain segment part containing 8-18 carbon atoms is divided into a longest chain and at least one short chain, wherein the longest chain contains 7-17 carbon atoms, and the longest chain is provided with one or more C1-C8 branched alkyl parts; b is a hydrophilic moiety of (EO/PO)_mR, EO/PO are alkoxy moieties selected from ethoxy, propoxy or their mixtures, m is 1-30, R is H or CH₃；

(4) 1.0-20.0% of a second nonionic surfactant with an HLB of 8-14 linear chain structure; the compounding mass ratio of the first nonionic surfactant to the second nonionic surfactant is 1: 4-4: 1; the mass ratio of the total amount of the first and second nonionic surfactants to the aromatic anionic surfactant is 1: 3-3: 1;

(5)0.1 to 30.0 percent of auxiliary agent; and 35.0 to 85.0 percent of deionized water.

Further, the total content of the surfactant in the composition is 5.0-40.0% by weight; the composition comprises the following components:

(1)5.0 to 15.0 percent of electrolyte;

(2) 5.0% to 25.0% of an anionic surfactant comprising: 3.0 to 15.0 percent of aromatic anionic surfactant; 0.5-5.0% of fatty acid salt, wherein the mass ratio of the saturated fatty acid salt to the unsaturated fatty acid salt is 1: 5-5: 1;

(3)2.0 to 20.0% of a critical arrangement parameter P (25 to 45 ℃) of 0.5 to 1.0 and A^b━ B; a. the^bThe hydrophobic chain segment part containing 8-18 carbon atoms is divided into a longest chain and at least one short chain, wherein the longest chain contains 7-17 carbon atoms, and the longest chain is provided with one or more C1-C8 branched alkyl parts; b is a hydrophilic moiety of (EO/PO)_mR, EO/PO are alkoxy moieties selected from ethoxy, propoxy and mixtures thereof, m is 1-30, R is H or CH₃；

(4) 2.0-15.0% of a second nonionic surfactant with an HLB of 9-12 linear chain structure; the compounding mass ratio of the first nonionic surfactant to the second nonionic surfactant is 1: 3-3: 1; the mass ratio of the total amount of the first and second nonionic surfactants to the aromatic anionic surfactant is 1: 2-2: 1;

(5)0.1 to 30.0 percent of auxiliary agent and 40.0 to 80.0 percent of deionized water.

The liquid detergent composition has a yield stress of 0.05-2.0 Pa at a temperature of 25-45 deg.C for 20s^-1The viscosity of the system at shear rate of (a) is less than 1000 mpa-s;

furthermore, the yield stress is preferably 0.1-1.0 Pa in the temperature range of 25-45 ℃.

Further, the liquid detergent composition can have a suspension density of 0.5 to 1.5g/cm³Capsule particles with the particle size of 10 nm-5 mm, oil microemulsion and particle size solid suspended matters.

Further, the relative molecular mass of the electrolyte in the component (1) is less than 1000, and the electrolyte is selected from any one or more of sodium carbonate, sodium silicate, sodium chloride, barium chloride, calcium chloride, magnesium sulfate, aluminum chloride, sodium citrate, sodium formate and sodium acetate.

Preferably, the electrolyte is a composition compounded by inorganic salt and organic salt, and the mass ratio of the inorganic salt to the organic salt is 1: 3-3: 1; more preferably 1:2 to 2: 1.

Further, the aromatic anionic surfactant in the component (2) is selected from any one or more of alkyl benzene sulfonate or its derivatives, alkyl disulfonate or its derivatives, fatty amide benzene sulfonate or its derivatives, alkylphenol polyoxyethylene ether sulfate, and alkylphenol polyoxyethylene ether carboxylate.

Preferably, the aromatic anionic surfactant is any one or more of dodecylbenzene sulfonate, cumene sulfonate, xylene sulfonate, benzene sulfonate, toluene sulfonate, 1, 3-benzene disulfonic acid disodium salt and 1, 2-benzene disulfonic acid disodium salt.

Further, the anionic surfactant in the component (2) may further comprise any one or a combination of more of a sulfonate surfactant, a carboxylate surfactant and a sulfate surfactant.

Further, the critical arrangement parameter P in the component (3) is 0.5 to 1.0 at a temperature of 25 ℃ to 45 ℃ and has A^b━ B is selected from fatty alcohol polyoxyethylene ether, fatty alcohol polyoxypropylene ether, fatty alcohol polyoxyethylene polyoxypropylene ether, fatty acid polyoxyethylene ester, fatty acid polyoxypropylene ester, fatty acid polyoxyethylene polyoxypropylene ester, alkylphenol polyoxyethylene, alkylphenol polyoxypropylene ether, alkylphenol polyoxyethylene polyoxypropylene ether and alkylphenol polyoxyethylene polyoxypropylene ether.

Preferably, the first nonionic surfactant is isomeric octanol (C8) polyoxyethylene ether, isomeric octanol (C8) polyoxypropylene ether, isomeric octanol (C8) polyoxyethylene polyoxypropylene ether, isomeric octanoic acid (C8) polyoxyethylene ester, isomeric octanoic acid (C8) polyoxypropylene ester, isomeric octanoic acid (C8) polyoxyethylene polyoxypropylene ester, isomeric decanol (C10) polyoxyethylene ether, isomeric decanol (C10) polyoxypropylene ether, isomeric decanol (C10) polyoxyethylene polyoxypropylene ether, isomeric decanoic acid (C10) polyoxyethylene ester, isomeric decanoic acid (C10) polyoxypropylene ether, isomeric decanoic acid (C10) polyoxyethylene polyoxypropylene ester, isomeric dodecanoic acid (C12) polyoxyethylene ester, isomeric dodecanoic acid (C12) polyoxypropylene ester, isomeric dodecanoic acid (C12) polyoxyethylene polyoxypropylene ester, isomeric tridecanol (C13) polyoxyethylene ether, isomeric tridecanol (C13) polyoxypropylene ether, Any one or more of isomeric tridecanol (C13) polyoxyethylene polyoxypropylene ether, isomeric stearyl alcohol (C16-18) polyoxyethylene ether, isomeric stearyl alcohol (C16-18) polyoxypropylene ether and isomeric stearyl alcohol (C16-18) polyoxyethylene polyoxypropylene ether.

Further, the second nonionic surfactant in the component (4) is selected from any one or more of linear fatty alcohol-polyoxyethylene ether, linear fatty acid-polyoxyethylene ester, linear fatty acid methyl ester ethoxylate, linear alkylphenol polyoxyethylene ether and linear amine oxide.

Preferably, the second nonionic surfactant is any one or combination of more of fatty alcohol (C12-14) polyoxyethylene ether, lauric acid (C12) polyoxyethylene ester, stearic acid (C18) polyoxyethylene ester, lauric acid (C12) methyl ester ethoxylate, stearic acid (C18) methyl ester ethoxylate, nonylphenol polyoxyethylene ether, dodecyl amine oxide and the like.

Further, the auxiliary agent in the component (5) is any one or combination of more of an alkaline agent (0.1-10%), a softening agent, an enzyme preparation, a pH stabilizer, a viscosity regulator, a preservative, a colorant, an essence, a fluorescent whitening agent and a color stabilizer.

In addition, the invention also provides a preparation method of the low-viscosity liquid detergent composition with yield stress, which is prepared by the following process steps:

(1) adding part of deionized water and alkali into a preparation tank;

(2) starting stirring, heating to 60 ℃, heating and saponifying fatty acid into fatty acid salt under an alkaline condition, and stirring until the fatty acid salt is completely dissolved;

(3) sequentially adding an anionic surfactant and a nonionic surfactant, and stirring until the anionic surfactant and the nonionic surfactant are completely dissolved;

(4) stopping heating, adding the rest deionized water into the preparation tank, and cooling to 40-45 ℃;

(5) adding a softening agent, an electrolyte and a pH regulator to regulate the pH value of the system, uniformly stirring, and cooling to 20-30 ℃;

(6) finally, adding essence, enzyme preparation, preservative and other additives, and stirring until the system is a uniform system.

Compared with the prior art, the invention has the technical effects that on one hand, the characteristic that the liquid detergent can stably suspend suspended matters such as microcapsule essence and the like under low viscosity is realized; another aspect is to achieve excellent storage stability of the liquid detergent composition system; the last aspect is to achieve the excellent washing performance and low cost characteristics of the liquid detergent with the suspension efficacy. The method has the following beneficial effects:

1) the problem that the system is high in cost and high in viscosity due to the fact that a suspending aid is adopted in a common detergent is solved, the system forms a layered liquid crystal structure through effective compounding of a surfactant, certain yield stress, excellent suspension stability and decontamination effect of the system are achieved, the detergent has the advantages of being simple, effective, low in viscosity, low in cost and the like, a certain suspending function is provided for a liquid washing product, suspended matters such as essence, protease, bleaching agent of microcapsules or emulsified oil and fat can be stably suspended through the suspending function, and therefore the liquid washing product is endowed with a certain specific functional characteristic;

2) meanwhile, the excellent washing performance of the composition is realized through the selection of the second nonionic surfactant;

3) the liquid detergent obtained by the method has relatively low viscosity, and overcomes the disadvantage of high viscosity carried by yield stress in the conventional technology.

Drawings

FIG. 1 shows liquid crystal structures corresponding to different alignment coefficients in surfactant molecules.

FIG. 2 is a rheological profile at 25 ℃ for composition E of example 4 and composition F of comparative example 2.

FIGS. 3(a), (b) are microstructures under a polarization microscope of the composition E of example 4 and the composition F of comparative example 2, respectively.

FIG. 4 is a graph showing the effect of composition E (a) of example 4 and composition F (b) of comparative example 2 on the suspension stability of colored decorative spheres at 45 ℃.

The invention will now be further described with reference to the accompanying drawings and specific embodiments.

Detailed Description

The features, benefits and advantages of the present invention will become apparent to those skilled in the art from a reading of the present disclosure.

All percentages, parts and ratios are based on the total weight of the composition of the present invention, unless otherwise specified. All weights as they pertain to listed ingredients are assigned to levels of active material and, therefore, do not include solvents or by-products that may be included in commercially available materials, unless otherwise specified. The term "weight content" herein may be expressed in accordance with "%".

All formulations and tests herein occur at 25 ℃ environment, unless otherwise indicated.

As used herein, "comprising," "including," "containing," "having," or other variations thereof, is intended to encompass non-inclusive inclusions such that no distinction is made between terms, and the term "comprising" means that other steps or ingredients can be added that do not affect the end result. The term "comprising" also includes the terms "consisting of …" and "consisting essentially of …". The compositions and methods/processes of the present invention can comprise, consist of, and consist essentially of the essential elements and limitations described herein, as well as any of the additional or optional ingredients, compositions, steps, or limitations described herein.

The invention relates to the field of daily chemical products, and particularly discloses a low-viscosity liquid detergent composition with yield stress. The method is mainly technically characterized in that a simple and effective method is adopted to enable the system to form yield stress within a certain range, so that the system can stably suspend suspended matters of different types, and the characteristics of relatively low viscosity, low cost and excellent washing performance of the system are maintained.

The main technical method is that a first nonionic surfactant with a vesicle structure and a critical arrangement parameter P (25-45 ℃) of 0.5-1.0 is screened out to be effectively compounded with an aromatic hydrophobic-end-containing anionic surfactant, so that the critical arrangement parameter P of surfactant molecules in a system can be as close to 1 as possible, a double electric layer formed by the composite surfactant is compressed with the aid of electrolyte, the critical arrangement parameter of the system can be closer to 1, the surfactant molecules can form lamellar micelles, a compact lamellar liquid crystal configuration is formed under a microscopic polarizing microscope, and the macroscopic shows shear thinning rheological property and relatively low viscosity; under the condition of high electrolyte content, a layered liquid crystal structure is microscopically formed by the system, so that the system macroscopically shows certain rheological yield stress, different suspended matters are stably suspended under the action of the yield stress, a certain suspension function is provided for a liquid washing product, the function can stably suspend the suspended matters such as essence, protease and bleaching agent of microcapsules or emulsified oil and fat, and further a certain specific functional characteristic such as lasting fragrance, excellent suspension stability of the system and the like is given to the liquid washing product.

Meanwhile, the invention realizes excellent washing performance of the composition by selecting the second nonionic surfactant, and keeps relatively low viscosity of the system in the presence of a lamellar liquid crystal structure. In addition, the liquid detergent obtained by the method has relatively low viscosity, and overcomes the disadvantage of high viscosity carried by yield stress in the conventional technology.

The experimental parameter definitions and reagents are as follows:

permutation parameter P factor

The morphology of the ordered combination of surfactant molecules depends on the geometry of the surfactant. Isrealachvili states that the state of surfactant aggregates is governed by the molecular equilibrium size. Geometric manipulation of surfactant aggregates correlates the total free energy with three key molecular geometric properties: (1) minimum area a occupied by polar group of surfactant₀(ii) a (2) Volume v of the hydrophobic tail of the surfactant; (3) length of surfactant hydrophobic tail chain when fully extended l_c. Isrealachvili comprehensively considers the three parameters and defines the three parameters as a critical arrangement parameter P:

for a nonionic surfactant, the critical arrangement parameter P of the surfactant can be calculated by an experimental method at a certain external physicochemical factor, such as the minimum area α occupied by polar groups of the surfactant in a linear nonionic surfactant₀The saturated adsorption amount Г can be experimentally measured_∞Test of (2) passes α₀＝1/N₀﹡Г_∞Is calculated to obtain N₀Is the Avogastron constant.

Volume v and length l at full extension of the corresponding hydrophobic tail chain_cThe calculation can also be made by the following equation:

ν＝(27.4+26.9n)×10^-3nm³

l_c＝(0.15+0.1265n)nm

wherein n is the number of C atoms in a hydrophobic chain.

In addition, the state of the micelle can be directly observed by an optical electron microscope, and the range of the critical arrangement parameter P of the nonionic surfactant can be determined. This patent generally employs the latter experimental observations to screen for the first nonionic surfactant.

The critical arrangement parameter P corresponds to the structure of the system in which surfactant molecules are aggregated as shown in fig. 1. When P in the system is close to 1, the surfactant of the system is arranged according to a flat double layer, and a lamellar liquid crystal structure can appear.

Layered liquid crystal structure

The liquid crystal structure is a structure of an ordered state between liquid and crystal, and has three kinds of lamellar liquid crystal phase, hexagonal liquid crystal phase and cubic liquid crystal phase. The micro-aggregate refers to a nano-scale or micro-scale structure formed by gathering molecules or atoms together through physical or chemical action, and a micelle formed by self-assembly of amphiphilic molecules is a typical micro-aggregate. Through selecting proper surfactants for compounding, the amphiphilic structure enables surfactant molecules to be self-assembled to form micelles when the concentration of the surfactant molecules in a solution reaches a certain value, and under the action of electrolyte, a double diffusion electrode layer of the micelles is compressed, and the repulsion of polar groups of the surfactant is weakened, so that the surfactant molecules can be arranged in a double layer to form a layered liquid crystal structure. In the layered liquid crystal structure, slippage easily occurs between layers, so that the layered liquid crystal structure has a relatively low viscosity.

Yield stress

It is meant that the composition exhibits a solid-like relative quiescent behavior when the external force is less than a threshold value, and a liquid-like flow behavior when the external force is greater than a threshold value, which is the yield stress of the composition. The yield stress of the composition is obtained by fitting and calculating through a Herschel-Bulkley method by using a rheometer, the yield stress range is 0.05-2.0 Pa within the temperature range of 25-45 ℃, preferably 0.1-1.0 Pa, the composition with the yield stress can have the shear thinning behavior in the aspect of viscosity, the composition with a certain yield stress can stably suspend suspended matters in a system, and the phenomena of layering, suspended matter sedimentation or floating of the system can be avoided.

Suspension stability

The suspension stability refers to that after the composition is stored for a certain time under certain conditions, suspended matters keep a suspended state in a matrix, the phenomenon of sinking or floating does not occur, and the phenomenon of obvious layering, sedimentation or flocculation does not occur in the appearance of the composition. The suspension stability referred to in the present invention can be evaluated by high temperature, low temperature, normal temperature and freeze-thaw cycling storage suspension stability tests.

Liquid detergent composition

The liquid detergent composition is a fabric detergent composition, and the composition is contacted with fabric in water to remove stains on the surface of the fabric, so that the aim of cleaning the surface of the fabric is fulfilled. The liquid detergent compositions typically also include a surfactant system and other conventional detergency builders such as pH adjusters, viscosity modifiers, enzyme preparations and the like.

Surfactant system

The present invention relates to surfactant systems for liquid detergent compositions including, but not limited to: one of anionic surfactant, nonionic surfactant, zwitterionic surfactant and their mixture. Preferred surfactant systems comprise a mixture of anionic and nonionic surfactants.

Anionic surfactants

The content of the anionic surfactant is 1.0-35.0% of the composition by the total weight of the composition.

The anionic surfactant contains 1.0-20.0% of anionic surfactant whose hydrophobic chain segment contains aromatic group and 0.1-10.0% of saturated fatty acid salt and unsaturated fatty acid salt composition, and also can contain one or several combinations of sulfonate surfactant, carboxylate surfactant and sulfate surfactant.

The anionic surfactant with hydrophobic segment containing aromatic functional group is preferably one or more of alkyl benzene sulfonate and its derivative, alkyl disulfonate and its derivative. The alkylbenzene sulfonate satisfies the following general formula:

wherein R is₁Is an alkyl group having 6 to 24 carbon atoms, M⁺Is a cation. R₁Is a linear or branched, saturated or alkyl group containing one or more unsaturated double bonds, preferably a linear alkyl group having a carbon number of 8 to 18.

Fatty acid refers to an organic substance having a carboxyl group and an aliphatic hydrocarbon chain. Fatty acid salts are formed by alkaline saponification of fatty acids, and the commonly used alkaline agents are sodium hydroxide and potassium hydroxide.

The fatty acid salt is a combination of a saturated fatty acid salt and an unsaturated fatty acid salt. The saturated fatty acid salt is fatty acid salt without carbon-carbon double bond, such as caprylate, caprate, laurate, myristate, palmitate, stearate, arachinate, etc.; the unsaturated fatty acid salt is fatty acid salt containing one or more carbon-carbon double bonds, wherein the unsaturated fatty acid salt containing one carbon-carbon double bond is oleate, and the unsaturated fatty acid salts containing a plurality of carbon-carbon double bonds are linoleate, linolenate, arachidonic acid salt and the like.

In addition, the anionic surfactant may comprise one or more of sulfonate surfactants, carboxylate surfactants, and sulfate surfactants, preferably one or more of C8-C18 alkyl sulfates, C8-C18 ethoxylated fatty alcohol sulfates, α -olefin sulfonates, fatty acid alkyl ester sulfonates, and ethoxylated fatty alcohol ether carboxylates.

In some embodiments, the mixture of anionic surfactants contains ethoxylated fatty alcohol sulfates. Ethoxylated fatty alcohol sulfates are derivatives of ethoxylated fatty alcohols having the general formula:

wherein R is₂Is an alkyl group having 6 to 24 carbon atoms; x is 1 to 30; wherein M is⁺Is a cation. R₂Is a linear or branched, saturated or alkyl group containing one or more unsaturated double bonds, preferably a linear alkyl group having a carbon number of 8 to 18. X represents an average degree of ethoxylation of from 1 to 30, preferably from 1 to 10, more preferably from 1 to 3.

In some embodiments, α -olefin sulfonate is present, having the formula:

wherein y is 0 to 2, R₃Is an alkyl group having 6 to 24 carbon atoms, preferably an alkyl group having 8 to 18 carbon atoms.

The anionic surfactant may further comprise fatty acid alkyl ester sulfate, preferably fatty acid Methyl Ester Sulfate (MES), and the carbon number of the fatty acid is preferably 8 to 18. Sulfosuccinates, preferably fatty alcohol polyoxyethylene ether-based succinic acid monoester disodium salt, preferably having a fatty alcohol carbon number of from 8 to 18, and an average degree of ethoxylation of preferably 2.0, may also be included.

Nonionic surfactant

The nonionic surfactant is selected from one or more of fatty alcohol alkoxylate, fatty acid methyl ester ethoxylate, alkyl polyglycoside, fatty acid alkylolamide, and ethoxylated sorbitan ester.

In some embodiments, the nonionic surfactant mixture preferably contains a fatty alcohol alkoxylate having the general formula:

wherein n is 6 to 24; x is 1 to 30 and y is 0 to 10.

The fatty alcohol alkoxylate is a product of ring opening polymerization of fatty alcohol and alkylene oxide under the action of an alkaline catalyst, and is basically a mixture. The aliphatic alcohols include straight chain alcohols or isomeric alcohols containing a branched chain. Alkoxy groups include ethoxy and propoxy groups. 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 more mixtures of hexanol, octanol, decanol, 2-ethylhexanol, 3-propylheptanol, lauryl alcohol, isotridecyl alcohol, tridecyl alcohol, tetradecyl alcohol, cetyl alcohol, palmitoleyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, linoleyl alcohol, linolenyl alcohol. The average degree of ethoxylation x is preferably from 2 to 12. Preferred examples are the NEODOL series of linear fatty alcohol ethoxylates products from SHELL, the ECOSURF EH series of ethoxylated and propoxylated 2-ethylhexanols products from DOW, the Lutensol XL series of ethoxylated and propoxylated 3-propylheptanols products from BASF and the Lutensol XP series of ethoxylated 3-propylheptanols products from BASF.

Other surfactants

The surfactant system to which the present invention relates may contain other surfactants: 0.01-30.0% of zwitterionic surfactant, 0.01-30.0% of cationic surfactant and 0.01-30.0% of gemini surfactant.

The zwitterionic surfactant comprises a betaine surfactant, an imidazoline surfactant, an amino acid surfactant and an amine oxide surfactant; including but not limited to: alkyl betaines, fatty amidobetaines, fatty amidopropyl betaines, fatty amidopropyl hydroxypropyl sulfobetaines, sodium alkyl acetate type imidazolines, fatty acid type imidazolines, sulfonic acid type imidazolines, aminopropionic acid derivatives, glycine derivatives, alkyl dimethyl amine oxides, fatty amidopropyl dimethyl amine oxides, and the like.

The cationic surfactant comprises quaternary ammonium salt surfactant, heterocyclic surfactant and polymer cationic surfactant. The cationic surfactant may include: mono-long linear quaternary ammonium salt, bi-long linear quaternary ammonium salt, benzyl quaternary ammonium salt, hydroxyalkyl quaternary ammonium salt, fatty amidopropyl hydroxyalkyl quaternary ammonium salt and polyquaternary ammonium salt obtained by copolymerization of vinyl pyrrolidone and unsaturated amide or unsaturated quaternary ammonium salt.

The gemini surfactant refers to a surfactant formed by linking two or more identical or nearly identical surfactant monomers together through chemical bonds, and the amphiphilic segments are linked together by a linking group at or near the hydrophilic head group. The Gemini surfactant comprises anionic Gemini surfactants such as sulfate type surfactant, sulfonate type surfactant, phosphate type surfactant and carboxylate type surfactant, and also comprises cationic Gemini surfactant and nonionic Gemini surfactant.

Washing assistant

The detergent composition according to the present invention may comprise a washing aid selected from the group consisting of an enzyme preparation, a bleaching system, an anti-redeposition agent and a colour stabilizer.

Anti-redeposition agent

The detergent composition of the present invention may contain an antiredeposition agent from the viewpoint of effectively improving the washing effect. The anti-redeposition agent includes, but is not limited to, the group consisting of: cellulose derivatives such as carboxymethyl cellulose, ethyl hydroxyethyl cellulose, methyl cellulose; homopolymers and copolymers of vinylpyrrolidone, for example linear polyvinylpyrrolidone, copolymers of vinylpyrrolidone and vinyl acetate, copolymers of vinylpyrrolidone and vinylimidazole. The antiredeposition agent is present in the detergent composition at a level of from 0.01% to 5%, preferably from 0.01% to 2%.

Fluorescent whitening agent

The use of optical brighteners in liquid detergent compositions is well known in the art and commercially available optical brighteners are abundant. Optical brighteners are present in the form of their alkali metal salts (mostly sodium salts). Preferred optical brighteners include, but are not limited to: distyrylbiphenyl compounds. A suitable example is 4, 4' -bis (2-sodium sulfonate styryl) biphenyl, such as the product of the BASF company under the CBS-X brand. The fluorescent whitening agents are used in amounts of 0.01% to 1.0%, preferably 0.05% to 0.1% of the total composition.

In the liquid detergent composition, the fluorescent whitening agent is 0.01-2.00 wt%, preferably 0.05-1.00 wt%, and more preferably 0.05-0.5 wt% of the liquid detergent composition.

Enzyme preparation

The detergent compositions to which the present invention relates may comprise one or more enzyme preparations selected from the group consisting of protease, α -amylase, cellulase, hemicellulase, phospholipase, esterase, lipase, peroxidase/oxidase, pectinase, lyase, mannanase, cutinase, reductase, xylanase, pullulanase, tannase, pentosanase, maltosan, arabinase, β -glucanase the detergent compositions are typically enzyme preparations of protease, amylase, lipase, cutinase and/or cellulase at levels of from 0.001% to 5%, preferably from 0.01% to 2% of the composition.

The detergent composition of the present invention may comprise: an enzyme stabilizing system in an amount of 0.001% to 10% by weight of the composition. The enzyme stabilizing system is compatible with detergent compositions and may comprise one or a mixture of more of calcium ions, boric acid, borax, propylene glycol, glycerol, polyols. The weight and amount of the enzyme stabilizing system is adjusted according to the form and composition of the detergent composition and the type of enzyme preparation.

Bleaching system

The detergent compositions to which the present invention relates may comprise a bleach system. The bleaching system comprises hypohalite bleaching agent, peroxide bleaching agent. Peroxide bleaches typically comprise a source of hydrogen peroxide and a bleach activation system. Sources of hydrogen peroxide include, but are not limited to, perborates, percarbonates, persulfates, and mixtures thereof. In some embodiments, the preferred hydrogen peroxide source is sodium percarbonate. The bleaching system may comprise a bleach activator for promoting rapid decomposition of peroxide at lower temperatures to generate oxygen selected from the group consisting of: tetraacetylethylenediamine, benzoyl caprolactam, 4-nitrobenzoyl caprolactam, 3-chlorobenzoyl caprolactam, benzoyloxybenzene sulfonate, nonanoyloxybenzene sulfonate, phenyl benzoate, decanoyloxybenzene sulfonate, benzoyl valerolactam, octanoyloxybenzene sulfonate and transition metal bleaching catalysts.

The detergent composition of the present invention may further contain a reactive oxygen species stabilizer for adjusting the rate of hydrogen peroxide generation by peroxide decomposition so as not to excessively increase the local concentration of hydrogen peroxide, and examples thereof include polyfunctional organic phosphoric acids such as hydroxyethylidene diphosphate and ethylenediaminetermethylene phosphate. In some embodiments, the bleaching system is present at a level of from 0.01% to 30%, preferably from 0.01% to 20%, more preferably from 0.01% to 10% by weight of the total detergent composition.

Optional ingredients

The detergent compositions to which the present invention relates comprise the following optional additives: one or more of alkaline agent, viscosity regulator, antiseptic, colorant and color stabilizer.

The detergent composition according to the present invention may comprise one or more alkaline agents selected from the group consisting of sodium hydroxide, potassium hydroxide, alkali metal carbonates, alkali metal silicates.

The detergent compositions to which the present invention relates may comprise one or more viscosity modifiers to provide suitable viscosity. Suitable viscosity modifiers are, for example, polysaccharides, gums, short-chain fatty alcohols, short-chain fatty alcohol alkyl ethers. Including but not limited to ethanol, propylene glycol, alkyl hydroxyalkyl cellulose ethers, carrageenan, xanthan gum, polyacrylamide derivatives, and the like.

In some embodiments, the detergent compositions to which the present invention relates preferably comprise preservatives, such as phenoxyl, sodium benzoate, isothiazolinones and their derivatives, including but not limited to one or a mixture of methylisothiazolinone, methylchloroisothiazolinone, benzisothiazolinone. The amount of the preservative is 0.001% to 5%, preferably 0.01% to 2%.

In some embodiments, the detergent compositions of the present invention comprise a colorant comprising a dye and a pigment. The colorant comprises all colorants used in washing products, such as acid bright red G, basic fuchsin, acid golden yellow G, acid bright yellow G, basic egg yolk, direct fast blue BIRL, indigo, and the like.

In some embodiments, the detergent compositions of the present invention comprise a color stabilizer. Color stabilizers include all color stabilizers that can be used in laundry products.

In addition to the optional ingredients described above, the detergent compositions of the present invention may also comprise: water, organic solvents, cosolvents, solubilizers, foam boosters, foam inhibitors, fabric softeners, anti-wrinkle agents, and the like. These additives and the associated methods of use are well known to those skilled in the art, and the particular type and amount of such additives can be selected and adjusted to the particular needs.

The experimental method is as follows:

methods of formulation and use

The detergent compositions of the present invention are prepared by various methods well known to those skilled in the art. The formulation of the composition may be carried out by conventional means, and the appropriate processing temperature and processing time will be selected with reference to the state and effect of the components in solution, and the stability of the components.

The detergent compositions of the present invention are useful in a manner well known to those skilled in the art, and typically are used by contacting the particular detergent composition embodiment with the surface of the item to be laundered, either undiluted or diluted in water, and then rinsing the surface of the item to be laundered.

Without further elaboration, it is believed that one skilled in the art can, using the preceding description, utilize the present invention to its fullest extent. The following examples are intended to further describe and demonstrate embodiments within the scope of the present invention. The examples are therefore to be understood as merely illustrative of the invention in more detail and not as limiting the content of the invention in any way.

In the following examples, all amounts are by weight unless otherwise indicated, and the amounts of the listed ingredients are converted to active material amounts.

In the examples, the reagents used will use the following abbreviations and have the indicated functions.

Liquid caustic soda: sodium hydroxide aqueous solution containing 32% of sodium hydroxide by mass, neutralizing fatty acid and saponifying to prepare fatty acid salt and/or neutralizing LAS, and alkaline agent;

and (3) LAS: linear alkyl benzene sulfonic acid, wherein the carbon atom number of linear alkyl is 10-13, and an anionic surfactant;

AES: ethoxylated fatty alcohol sulfate, wherein the number of carbon atoms of a fatty alcohol chain is 12-14, the average ethoxylation degree is 2, and an anionic surfactant;

EH-6: isomeric octanol polyoxyethylene ether, branched non-ionic surface active agent with vesicle structure (P is more than 0.5 and less than 1);

TO 8: isomeric 13C fatty alcohol ether, branched non-ionic surfactant with vesicle structure (P is more than 0.5 and less than 1);

XL-90: isomeric 10C fatty alcohol ether, branched non-ionic surfactant with vesicle structure (P is more than 0.5 and less than 1);

AEO-7: ethoxylated fatty alcohol, average degree of ethoxylation 7, straight chain nonionic surfactant;

AEO-9: ethoxylated fatty alcohol, average degree of ethoxylation 9, straight chain nonionic surfactant;

sodium chloride/potassium chloride/sodium sulfate/sodium citrate/sodium acetate: an electrolyte;

LAB: lauramidopropyl betaine, zwitterionic surfactant;

fragrance CAPS: the microcapsule essence is a micro container made of natural or synthetic high molecular materials, the liquid drop essence is completely encapsulated in the micro container to form the microcapsule essence, and the density is generally 0.8-1.2 g/cm³The size is 1-1000 μm; holdingAn efficacy substance for lasting fragrance of the fabric;

and SE: silicone Emulsion, Silicone oil Emulsion, density 0.95-1.05 g/cm³The size is 1 mu m-1 mm; the flexibility of the fabric can be effectively improved in the washing process;

CSP: colored Solid Particles with a density of 1.2-1.5 g/cm³The size is 0.5-5 mm, and the detergent can play a decorative effect in washing products;

glass microspheres: a hollow closed spherical and powdery ultra-light filling material with the density of 0.5-0.6 g/cm³The particle size is 1-5 mm; the fabric can have a frosting effect in the washing process.

The present invention relates to a low viscosity liquid detergent composition having a yield stress which satisfies the following conditions:

a) contains an electrolyte having a molecular weight of less than 1000; b) anionic surfactants including aromatic anionic surfactants and fatty acid salts; c) a nonionic surfactant including a first and a second nonionic surfactant; d) other surfactants and auxiliaries.

The low viscosity liquid detergent composition with yield stress of the present invention is prepared as follows:

(1) adding part of deionized water and alkali into a preparation tank;

(3) sequentially adding an anionic surfactant, a nonionic surfactant and the like, and stirring until the mixture is completely dissolved;

(6) and finally adding the additives such as essence, enzyme preparation, preservative and the like, and stirring until the system is a uniform system.

Layered liquid crystal structure testing

A polarizing microscope is a microscope that identifies the optical properties of a liquid crystal structure of a substance. When the substance contains a lamellar liquid crystal structure, a distinct cross weave, i.e., maltese cross, can be observed by a polarizing microscope. And judging the formation of the lamellar liquid crystal structure according to the structural characteristic shape of the polarization microscope fabric.

Rheological yield stress test

The rheological property of the detergent composition is tested by an Antopa MCR302 type rheometer, the testing temperature is 25-45 ℃, and the shear rate range is 0.1-100 s^-1By Herschel-Bulkley, y ═ a + b.x^pThe equation is fitted to calculate the yield stress of the composition, and the correction Ratio (R2) is required to be more than 0.99 when the equation is fitted.

Viscosity measurement

The rheological properties of the detergent composition were measured by an Antopa MCR302 rheometer at 25 deg.C for 20s^-1The corresponding system viscosity under the condition of shear rate.

Composition storage suspension stability test

High-temperature suspension stability: after the detergent composition is bottled and sealed, the detergent composition is placed in an environment of 45 +/-1 ℃, is placed at a constant temperature for 1 month, and is recovered to the environment of 25 +/-5 ℃ at room temperature, the composition is not layered or precipitated, suspended matters do not obviously float or settle, the high-temperature stability is qualified, and otherwise, the detergent composition is unqualified.

Low-temperature suspension stability: after the detergent composition is bottled and sealed, the detergent composition is placed in an environment of 0 +/-2 ℃, is placed at a constant temperature for 1 month, is taken out and is immediately observed, the composition is not layered or precipitated, suspended matters do not obviously float or settle, the low-temperature stability is qualified, and otherwise, the detergent composition is unqualified.

Suspension stability at normal temperature: after the detergent composition is bottled and sealed, the detergent composition is placed in an environment with the temperature of 25 +/-5 ℃, and after the detergent composition is placed at a constant temperature for 1 month, the detergent composition does not delaminate or precipitate, suspended matters do not obviously float or settle, the detergent composition is qualified in normal-temperature stability, and the detergent composition is unqualified otherwise.

Freeze-thaw cycle suspension stability: the detergent composition is bottled and sealed, then placed in an environment with the temperature of-15 to-20 ℃, placed at a constant temperature for 24 hours, taken out, placed in an environment with the room temperature of 25 +/-5 ℃ for 24 hours, circulated once and continuously circulated for four times, and the state of the composition is observed each time. The composition is not layered or precipitated, and suspended matters are not obviously floated or settled, so that the freeze-thaw cycle stability is qualified, otherwise, the composition is unqualified.

Detergency

Detergency in the present invention refers to the ability of a liquid detergent composition to remove various stains. The test is carried out according to the method of the national standard GB/T13174-2008. The whiteness W of the three dirty cloths before washing is measured by a fluorescence whiteness meter by adopting three dirty cloths of carbon black, protein and sebum₁. Preparing washing water with the hardness of 250ppm according to GB/T13174-₂The difference in whiteness △ W was calculated as follows:

△W＝W₂-W₁，W₂: whiteness of soiled Fabric after washing, W₁: whiteness of the stained cloth before washing.

The smaller the △ W value, the smaller the difference in whiteness after washing before washing of stained cloth, and the poorer the cleaning effect of the composition.

The following are specific examples and comparative examples:

examples 1 to 3 and comparative example 1

Compositions A to D of examples 1 to 3 and comparative example 1 were prepared as shown in Table 1. The rheological yield stress and viscosity of each system were measured and the results are shown in table 1.

TABLE 1 Low viscosity liquid detergent compositions with yield stress

In examples 1-3 and comparative example 1, the surfactant type and content matrix in each system are consistent, and the difference of the systems is electrolyte content, so that each system has large difference in rheological yield stress, wherein in examples 1-3, sodium chloride and sodium citrate exist, so thatThe obtained system has a certain yield stress, and the comparative example has no yield stress; while the systems of examples 1 to 3 are 20s^-1At a shear rate of less than 1000 mpa-s, the respective system maintains a viscosity of less than 1000 mpa-s. Maintaining a relatively high yield stress at a relatively low viscosity, the system has excellent suspension stability for CSP decorations.

Examples 4 to 7 and comparative examples 2 to 5

Compositions E to L of examples 4 to 7 and comparative examples 2 to 5 were prepared as shown in Table 2. The rheological yield stress and viscosity of each system were measured and the results are shown in table 2.

Table 2 low viscosity liquid detergent compositions with yield stress

The difference between the four sets of comparisons in Table 2 for example 4 composition E and comparative example 2 composition F, example 5 composition G and comparative example 3 composition H, example 6 composition I and comparative example 4 composition J, and example 7 composition K and comparative example 5 composition L is the difference between the electrolyte content of the examples and the electrolyte content of the comparative examples.

Fig. 2, 3 and 4 are a graph showing the rheological curves, microstructures under a polarization microscope, and the effect of suspension stabilization of the colored decorative spheres at 45 ℃ for composition E of example 4 and composition F of comparative example 2, respectively.

From experimental test results, the electrolyte is contained in the example 4, a layered liquid crystal structure is formed in the system as can be seen from fig. 3(a), the yield stress is generated in the rheological test result system, the microcapsule essence can be stably suspended, the problems of floating, precipitation, separation, layering and the like of the microcapsule cannot occur in the processes of high-temperature, low-temperature, normal-temperature and freeze-thaw cyclic storage, and the stability of each system is qualified; in contrast, comparative example 2 does not contain an electrolyte, and it can be seen from fig. 3(b) that the system does not have a lamellar liquid crystal structure, cannot generate a yield stress, cannot stably suspend the decorated color particles, and settles in the system (as shown in fig. 4), resulting in an unstable state of the system at both low temperature and high temperature, normal temperature, or during freeze-thaw cycles.

The rheological curves and microstructures under a polarizing microscope are represented by the composition E of example 4 and the composition F of comparative example 2, and the results are shown in FIGS. 2 and 3, which are completely consistent with the description in Table 1, the rheological curve of the composition E shows the typical shear thinning phenomenon, while the viscosity of the composition F does not change much with the shear rate, and the shear thinning is the typical characteristic of the system having the yield stress.

In addition, in example 5 and comparative example 3, example 6 and comparative example 4, since the systems of comparative examples 3 and 4 only contain a single electrolyte, although the systems can form a compact lamellar liquid crystal structure, on one hand, the yield stress of the systems is relatively large, and is greater than 1.0Pa at 25 ℃, so that a large amount of bubbles existing in the systems cannot be released to affect the appearance of the product; at the same time, the viscosity of the system can be increased rapidly, so that the temperature of the system is 25 ℃ in 20s^-1The viscosity of the system is more than 1000mpa · s under the condition of shear rate. In examples 5 and 6, the electrolyte is compounded, so that the situation is avoided. Meanwhile, in examples 4 to 7, the yield stress of the system generally increases as the electrolyte content in the system increases.

For example 7 and comparative example 5, the difference between the two is again the difference in the electrolyte content in the system. Since the electrolyte content of the comparative example 5 is low (lower than the lowest range of the electrolyte content of the invention), the comparative example 5 can not form an obvious lamellar liquid crystal structure, the system also has no yield stress, the SE silicone oil emulsion can not be stably suspended, and the SE silicone oil emulsion floats during the storage process of the system at high temperature, low temperature, normal temperature and freeze-thaw cycle.

Examples 8 to 10 and comparative example 6

Compositions M to P of examples 8 to 10 and comparative example 6 were prepared as shown in Table 3. The rheological yield stress and viscosity of each system were tested and in addition, the laundry soil release test was also performed on a low viscosity liquid detergent composition having a certain yield stress, and the results are shown in table 3.

TABLE 3 Low viscosity liquid detergent compositions with yield stress

Examples 8-10 differ from comparative example 6 in that example compositions M, N and O contained a certain amount of electrolyte, whereas comparative example 6 composition P contained no electrolyte. As can be seen from the results in table 3, compositions M, N and O, which contained a certain amount of electrolyte, both had superior cleaning performance (including carbon black soiled cloth, protein soiled cloth, and sebum soiled cloth) to composition P. In compositions M, N and O, the detergency performance of each system increased with increasing electrolyte content in the system.

The above examples demonstrate that the present invention employs a low-cost, simple and effective manner, i.e. the electrolyte is used to form a lamellar liquid crystal structure of the system, so as to generate a certain yield stress, which not only can effectively suspend suspended matters stably, but also can effectively maintain or improve the detergent performance of the composition, and effectively realize the characteristics of low cost and high performance of the system.

The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Unless otherwise stated, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as "40 mm" is intended to mean "about 40 mm".

All documents cited in the summary of the invention are incorporated by reference herein in relevant part. The citation of any document is not to be construed as an admission that it is prior art with respect to the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A low viscosity liquid detergent composition having a yield stress characterized by: the total content of the surfactant in the composition is 3.0-40.0% by weight, and the composition comprises the following components:

1)3.0 to 15.0 percent of electrolyte;

2) 1.0% to 35.0% of an anionic surfactant comprising: 1.0 to 20.0 percent of aromatic anionic surfactant; 0.1-10.0% of fatty acid salt, wherein the mass ratio of the saturated fatty acid salt to the unsaturated fatty acid salt is 1: 10-10: 1;

3) at a temperature of 25 to 45 ℃, 1.0 to 30.0 percent of the critical arrangement parameter P is 0.5 to 1.0 and A^b-a first nonionic surfactant of structure B; a. the^bThe hydrophobic chain segment part containing 8-18 carbon atoms is divided into a longest chain and at least one short chain, wherein the longest chain contains 7-17 carbon atoms, and the longest chain is provided with one or more C1-C8 branched alkyl parts; b is a hydrophilic moiety of (EO/PO)_mR, EO/PO are alkoxy moieties selected from ethoxy, propoxy or their mixtures, m is 1-30, R is H or CH₃；

4) 1.0-20.0% of a second nonionic surfactant with an HLB of 8-14 linear chain structure; the compounding mass ratio of the first nonionic surfactant to the second nonionic surfactant is 1: 4-4: 1; the mass ratio of the total amount of the first and second nonionic surfactants to the aromatic anionic surfactant is 1: 3-3: 1;

5)0.1 to 30.0 percent of auxiliary agent; and 35.0 to 85.0 percent of deionized water;

the detergent composition has a yield stress of 0.05-2.0 Pa within a temperature range of 25-45 ℃ within 20s^-1The viscosity of the system is less than 1000 mpa-s at shear rate (c).

2. The liquid detergent composition according to claim 1, characterized in that: the total content of the surfactant in the composition is 5.0-40.0% by weight; the composition comprises the following components:

1)5.0 to 15.0 percent of electrolyte;

2) 5.0% to 25.0% of an anionic surfactant comprising: 3.0 to 15.0 percent of aromatic anionic surfactant; 0.5-5.0% of fatty acid salt, wherein the mass ratio of the saturated fatty acid salt to the unsaturated fatty acid salt is 1: 5-5: 1;

3) at a temperature of 25 to 45 ℃, 2.0 to 20.0 percent of critical arrangement parameter P is 0.5 to 1.0 and A^b━ B; a. the^bThe hydrophobic chain segment part containing 8-18 carbon atoms is divided into a longest chain and at least one short chain, wherein the longest chain contains 7-17 carbon atoms, and the longest chain is provided with one or more C1-C8 branched alkyl parts; b is a hydrophilic moiety of (EO/PO)_mR, EO/PO are alkoxy moieties selected from ethoxy, propoxy and mixtures thereof, m is 1-30, R is H or CH₃；

4) 2.0-15.0% of a second nonionic surfactant with an HLB of 9-12 linear chain structure; the compounding mass ratio of the first nonionic surfactant to the second nonionic surfactant is 1: 3-3: 1; the mass ratio of the total amount of the first and second nonionic surfactants to the aromatic anionic surfactant is 1: 2-2: 1;

5)0.1 to 30.0 percent of auxiliary agent; and 40.0 to 80.0 percent of deionized water.

3. A liquid detergent composition according to claim 1 or 2, characterized in that: the liquid detergent composition can have a suspension density of 0.5 to 1.5g/cm³Capsule particles with the particle size of 10 nm-5 mm, oil microemulsion and particle size solid suspended matters.

4. A liquid detergent composition according to claim 1 or 2, characterized in that: the relative molecular mass of the electrolyte is less than 1000, and the electrolyte is selected from any one or combination of more of sodium carbonate, sodium silicate, sodium chloride, barium chloride, calcium chloride, magnesium sulfate, aluminum chloride, sodium citrate, sodium formate and sodium acetate.

5. The liquid detergent composition according to claim 4, characterized in that: the electrolyte is selected from a compound of inorganic salt and organic salt, and the mass ratio of the inorganic salt to the organic salt is 1: 3-3: 1.

6. A liquid detergent composition according to claim 1 or 2, characterized in that: the aromatic anionic surfactant is selected from one or more of alkylbenzene sulfonate, fatty amide benzene sulfonate, alkylphenol polyoxyethylene ether sulfate and alkylphenol polyoxyethylene ether carboxylate.

7. The liquid detergent composition according to claim 6, characterized in that: the aromatic anionic surfactant is selected from any one or more of dodecyl benzene sulfonate, cumene sulfonate, xylene sulfonate, benzene sulfonate and toluene sulfonate.

8. A liquid detergent composition according to claim 1 or 2, characterized in that: the anionic surfactant may further comprise any one or more of a sulfonate type surfactant, a carboxylate type surfactant and a sulfate type surfactant in combination.

9. A liquid detergent composition according to claim 1 or 2, characterized in that: at a temperature of 25-45 ℃, the critical arrangement parameter P is 0.5-1.0 and A^bThe first nonionic surfactant with-B structure is selected from fatty alcohol polyoxyethylene ether, fatty alcohol polyoxypropylene ether, fatty alcohol polyoxyethylene polyoxypropylene ether, fatty acid polyoxyethylene ester, fatty acid polyoxypropylene ester, fatty acid polyoxyethylene polyoxypropylene ester, alkylphenol polyoxyethylene ether, alkylphenol polyoxypropylene ether and alkylphenol polyoxyethylene polyoxypropylene etherAny one or more of the combinations.

10. The liquid detergent composition according to claim 9, characterized in that: the first nonionic surfactant is selected from: isomeric octanol polyoxyethylene ether of C8, isomeric octanol polyoxypropylene ether of C8, isomeric octanol polyoxyethylene polyoxypropylene ether of C8, isomeric octanoic acid polyoxyethylene ester of C8, isomeric octanoic acid polyoxypropylene ester of C8, isomeric octanoic acid polyoxyethylene polyoxypropylene ester of C8, isomeric decanoic alcohol polyoxyethylene ether of C10, isomeric decanoic alcohol polyoxypropylene ether of C10, isomeric decanoic alcohol polyoxyethylene polyoxypropylene ether of C10, isomeric decanoic acid polyoxyethylene ester of C10, isomeric decanoic acid polyoxypropylene ether of C10, isomeric decanoic acid polyoxyethylene polyoxypropylene ester of C10, isomeric dodecanoic acid polyoxyethylene ester of C12, isomeric dodecanoic acid polyoxyethylene ester of C12, isomeric dodecanoic acid polyoxyethylene polyoxypropylene ester of C12, isomeric tridecanol polyoxyethylene ether of C13, isomeric tridecanol polyoxypropylene ether of C13, isomeric tridecanol polyoxyethylene propylene ether of C13, isomeric stearyl alcohol polyoxyethylene ether of C16-18, Any one or more of isomeric stearyl alcohol polyoxypropylene ether with C16-18 and isomeric stearyl alcohol polyoxyethylene polyoxypropylene ether with C16-18.

11. A liquid detergent composition according to claim 1 or 2, characterized in that: the second nonionic surfactant is selected from one or more of linear fatty alcohol polyoxyethylene ether, linear fatty acid polyoxyethylene ester, linear fatty acid methyl ester ethoxylate, linear alkylphenol polyoxyethylene ether and linear amine oxide.

12. The liquid detergent composition according to claim 11, characterized in that: the second nonionic surfactant is selected from one or more of C12-14 fatty alcohol polyoxyethylene ether, C12 polyoxyethylene laurate, C18 polyoxyethylene stearate, C12 methyl laurate ethoxylate, C18 methyl stearate ethoxylate, nonylphenol polyoxyethylene ether, dodecyl amine oxide and the like.

13. A liquid detergent composition according to claim 1 or 2, characterized in that: the auxiliary agent is any one or a combination of more than one of 0.1-10% of alkali agent, softening agent, enzyme preparation, pH stabilizer, viscosity regulator, preservative, colorant, essence, fluorescent whitening agent and color stabilizer.

14. A process for preparing a low viscosity liquid detergent composition having a yield stress according to claim 13, characterized in that it is prepared by the process steps of:

1) adding part of deionized water and alkali into a preparation tank;

2) starting stirring, heating to 60 ℃, heating and saponifying fatty acid into fatty acid salt under an alkaline condition, and stirring until the fatty acid salt is completely dissolved;

3) sequentially adding an anionic surfactant and a nonionic surfactant, and stirring until the anionic surfactant and the nonionic surfactant are completely dissolved;

4) stopping heating, adding the rest deionized water into the preparation tank, and cooling to 40-45 ℃;

5) adding a softening agent, an electrolyte and a pH regulator to regulate the pH value of the system, uniformly stirring, and cooling to 20-30 ℃;

6) finally, adding essence, enzyme preparation, preservative and other additives, and stirring until the system is a uniform system.