Liquid laundry soap and preparation method thereof

Abstract

The invention relates to the technical field of preparation of daily chemical detergents, and particularly discloses a liquid washing soap and a preparation method thereof. The liquid laundry soap is prepared from the following raw materials in percentage by mass: 10%-30% of isooctadecanoic acid, 5%-15% of oleic acid, 5%-25% of a neutralizing agent, 0.1%-1% of tea saponin, 0.1%-1% of iso-tridecanol polyoxyethylene ether, 0.1%-1% of cocoanut fatty acid diethanolamide, 1%-10% of a calcium soap dispersing agent, 1%-20% of a solvent, 0.1%-5% of a chelating agent, 0.01%-1% of a whitening agent, 0.1%-2% of an enzyme preparation, 0.01%-1% of a preservative, 0.01%-1.5% of an antioxidant and the balance of water. The content of fatty acid soap in the liquid washing soap can reach 30% or above, and the liquid washing soap is liquid soap with the fatty acid soap as a main decontamination component and has good stability, naturalness and decontamination capacity.

Description

Technical Field

[0001] The invention relates to the technical field of daily chemical detergent preparation, in particular to a liquid laundry soap and a preparation method thereof. Background Art

[0002] As the earliest recorded detergent in human history, soap can be traced back to 2500 BC, when people cleverly mixed and heated grease and wood ash to produce a mixture with strong cleaning ability to wash wool and clothes. With its natural, mild and low-foaming properties, soap has occupied an important position in the washing field for centuries. However, with the rapid development of petrochemicals and surfactant industries in the 20th century, synthetic detergents gradually replaced soap's dominant position in household washing with their advantages in performance optimization and cost control.

[0003] Entering the 21st century, with the increasingly severe global environmental problems and the intensification of the energy crisis, all sectors of society have begun to re-examine and pay attention to the value of natural raw materials. In this context, soap has regained the favor of consumers due to its natural ingredients and biodegradability. However, although traditional soap has many advantages, it also has defects that cannot be ignored, such as poor hard water resistance, hard feel of clothes after washing, and the easy generation of residual "soap feet" during use, resulting in low utilization rate and waste of resources.

[0004] In order to make up for these deficiencies, the scientific research community actively explored new ways to incorporate fatty acid soaps into modern detergent formulas and introduced the so-called "soap liquid". However, the "soap liquid" products currently on the market generally have the problem of low fatty acid soap content (maximum no more than 15%, most below 5%). This is because after the fatty acid soap content increases, the stability of the "soap liquid" will be affected and may lose its practical value. Therefore, the "soap liquid" products currently on the market still mainly rely on synthetic surfactants as the main decontamination component, which to a certain extent weakens the advantages of fatty acid soaps as natural detergents, making the natural properties of its products far lower than traditional solid soaps. For example, the disclosed patent CN103525602B describes a soap liquid formula, in which the addition amount of fatty acid soap (such as potassium coconut oleate soap) only accounts for 0.5%-1.5% of the total formula, while a large amount of synthetic surfactants such as sodium dodecylbenzene sulfonate, sodium dodecyl alcohol polyoxyethylene ether sulfate, and a variety of additives are used. Similarly, N101921679B also studied a liquid soap containing fatty acid ethyl ester sulfonate. Although it contained fatty acid soap ingredients such as potassium laurate, its main body was still a complex system composed of multiple synthetic surfactants.

[0005] In view of the above situation, the present invention aims to break through the limitations of the prior art and develop a liquid laundry soap with fatty acid soap as the main decontamination component. Summary of the invention

[0006] In order to overcome the technical obstacle of low fatty acid soap content in liquid detergents in the prior art, the present application provides a liquid laundry soap and a preparation method thereof. Through a series of studies, the present application successfully achieves a significant increase in the fatty acid soap content in the liquid laundry soap, so that the fatty acid soap content in the liquid laundry soap can exceed 30%, forming a detergent formula with fatty acid soap as the main decontamination ingredient. This liquid laundry soap has excellent stability, perfectly combines the natural advantages of traditional soaps with the high efficiency of modern washing technology, and achieves more outstanding decontamination ability.

[0007] In the first aspect, the present application provides a liquid laundry soap adopting the following technical solution: A liquid laundry soap comprises the following raw materials in percentage by mass: 10%-30% of isooctadecanoic acid, 5%-15% of oleic acid, 5%-25% of a neutralizer, 0.1%-1% of tea saponin, 0.1%-1% of isotridecyl alcohol polyoxyethylene ether, 0.1%-1% of coconut oil fatty acid diethanolamide, 1%-10% of a calcium soap dispersant, 1%-20% of a solvent, 0.1%-5% of a chelating agent, 0.01%-1% of a whitening agent, 0.1%-2% of an enzyme preparation, 0.01%-1% of a preservative, 0.01%-1.5% of an antioxidant, and the balance is water.

[0008] In the above technical scheme, the present application adopts the reaction of isomeric octadecanoic acid, oleic acid and a neutralizing agent to generate fatty acid soap, so that the content of fatty acid soap in the liquid laundry soap exceeds 30%. By adopting the compound of isomeric octadecanoic acid and oleic acid to replace the traditional straight-chain C8-18 saturated and unsaturated fatty acids, the influence of the excessive content of fatty acid soap in the liquid laundry soap on the stability of the system is successfully solved, and the stability of the liquid laundry soap is ensured. At the same time, the compound of oleic acid and isomeric octadecanoic acid achieves a synergistic effect, improves the cleaning ability of the liquid laundry soap, and effectively removes stains and grease on clothes.

[0009] At the same time, the present application further improves the cleaning ability and stability of liquid laundry soap by introducing three auxiliary surfactants, namely tea saponin, isomeric tridecanol polyoxyethylene ether and coconut oil fatty acid diethanolamide. The three interact synergistically, not only enhancing the decontamination effect of liquid laundry soap, but also enhancing the stability of liquid laundry soap, bringing a better user experience to liquid laundry soap.

[0010] In addition, the addition of calcium soap dispersants helps prevent calcium soap precipitation and improves the use of detergents in hard water; the addition of solvents helps dissolve and disperse water-insoluble raw materials in liquid laundry soap to ensure the uniformity and stability of liquid laundry soap; chelating agents can combine with metal ions in water to prevent the negative impact of metal ions on the washing effect during the washing process; brighteners and enzyme preparations are used to improve the whiteness of clothes and remove stubborn stains respectively. Antioxidants are used to solve the problem of poor oxidation stability of fatty acid soaps, while preservatives are used to extend the shelf life of liquid laundry soap. Antioxidants and preservatives interact with each other to ensure the stability of liquid laundry soap during storage and use.

[0011] Preferably, the calcium soap dispersant is one or more of sodium fatty alcohol polyoxyethylene ether sulfate AES, N-methyl taurine fatty amide, sodium α-fatty acid methyl ester sulfonate, sulfobetaine, and alkyl glycoside.

[0012] Preferably, the calcium soap dispersant is composed of sulfobetaine and alkyl glycoside, and comprises 0.5%-7% sulfobetaine and 0.5%-3% alkyl glycoside in terms of mass percentage of the liquid laundry soap.

[0013] Preferably, the sultaine is cocamidopropyl hydroxysultaine.

[0014] Preferably, the alkyl glycoside is alkyl glycoside APG08.

[0015] Preferably, the liquid laundry soap comprises 7% cocamidopropyl hydroxysulfobetaine and 3% alkyl glucoside APG08.

[0016] In the above technical solution, the present application effectively improves the washing effect of liquid laundry soap in hard water by limiting the type and amount of calcium soap dispersant, especially by using a combination of sulfobetaine and alkyl polyglycoside. The synergistic effect of sulfobetaine and alkyl polyglycoside can not only prevent calcium soap precipitation, but also enhance the decontamination ability of the detergent, ensuring good product stability and decontamination effect.

[0017] Preferably, the neutralizing agent is one or more of potassium hydroxide, sodium hydroxide, monoethanolamine, and triethanolamine.

[0018] Preferably, the neutralizing agent is triethanolamine.

[0019] In the above technical scheme, the present application selects triethanolamine as a neutralizing agent. Triethanolamine has good water solubility and neutralizing ability, and can effectively react with fatty acids to generate fatty acid soaps, while maintaining the pH value of the liquid laundry soap within a mild range, thereby further improving the mildness of the liquid laundry soap.

[0020] Preferably, the antioxidant is one or more of citric acid, 6-ethoxy-1,2-dioxy-2,2,4-trimethylquinolone, butylated hydroxytoluene, and sodium sulfite.

[0021] Preferably, the antioxidant is sodium sulfite.

[0022] In the above technical solution, by selecting sodium sulfite as the antioxidant, the antioxidant performance of the liquid laundry soap is further improved, and the shelf life of the product is effectively extended. Sodium sulfite, as a commonly used antioxidant, can effectively inhibit the deterioration of fatty acid soap due to oxidation during storage and use, thereby ensuring that the liquid laundry soap maintains its cleaning effect and stability for a long time.

[0023] Preferably, the chelating agent is one of disodium ethylenediaminetetraacetate and tetrasodium glutamate diacetate, or a mixture thereof.

[0024] Preferably, the chelating agent is tetrasodium glutamate diacetate.

[0025] Preferably, the solvent is one or more of ethanol, propylene glycol, butylene glycol, and glycerol.

[0026] Preferably, the solvent is propylene glycol.

[0027] Preferably, the whitening agent may be selected from CBW series and CBS series.

[0028] Preferably, the enzyme preparation may include protease and cellulase.

[0029] Preferably, the preservatives include kasone, phenoxyethanol, potassium sorbate and the like.

[0030] Preferably, the liquid laundry soap further comprises 0.1%-2% fragrance.

[0031] Preferably, the liquid laundry soap further comprises an appropriate amount of pigment.

[0032] In a second aspect, the present application provides a method for preparing a liquid laundry soap using the following technical solution: A method for preparing liquid laundry soap comprises the following steps: Step 1: Take deionized water, add chelating agent and antioxidant under stirring, and stir evenly; Step 2: Add solvent, neutralizer, isomeric octadecanoic acid and oleic acid and stir evenly; Step 3: Add calcium soap dispersant and stir evenly; Step 4: Add the remaining ingredients and stir well to get liquid laundry soap.

[0033] In the above technical solution, the liquid laundry soap of the present application can be prepared at room temperature without the need for an additional heat source, which achieves the control of the preparation cost of the liquid laundry soap and reduces resource waste. At the same time, the present application also ensures the uniformity and stability of the liquid laundry soap by optimizing the preparation process. Such liquid laundry soap is suitable for various washing environments, can effectively prevent the negative effects of metal ions and oxidation on the washing effect, and keeps the clothes soft after washing.

[0034] Preferably, the stirring rate of step 1, step 2, step 3 and step 4 is 10-20 Hz.

[0035] In the above technical solution, the present application ensures that the raw materials are fully mixed in the liquid laundry soap by controlling the stirring rate within the range of 10-20 Hz. The stirring rate of 10-20 Hz helps to form a stable emulsified system, thereby improving the stability and decontamination effect of the product.

[0036] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application overcomes the technical difficulty of the prior art that it is difficult to maintain the stability of liquid laundry soap after the fatty acid soap content in liquid laundry soap is increased to more than 15% by using isomeric octadecanoic acid and oleic acid, and achieves the technical effect of maintaining the stability of the fatty acid soap content in liquid laundry soap when it is increased to more than 30%, further improving the naturalness, cleaning power and decontamination effect of liquid laundry soap. The liquid laundry soap of the present application is suitable for washing various clothes, and is suitable for hand washing and machine washing.

[0037] 2. The present application further enhances the detergency of liquid laundry soap and improves the stability of liquid laundry soap by adding a co-surfactant composed of tea saponin, isomeric tridecanol polyoxyethylene ether and coconut oil fatty acid diethanolamide into the liquid laundry soap.

[0038] 3. The present application effectively prevents the precipitation of calcium soap in hard water by using a specific calcium soap dispersant, especially a combination of sulfobetaine and alkyl glycoside, so that the liquid laundry soap can maintain a good washing effect under hard water conditions. DETAILED DESCRIPTION

[0039] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0040] Example 1 A liquid laundry soap comprises the following raw materials: isomeric octadecanoic acid, oleic acid, triethanolamine, alkyl glycoside APG08, tea saponin, isomeric tridecanol polyoxyethylene ether, coconut oil fatty acid diethanolamide, propylene glycol, tetrasodium glutamate diacetate, brightener, cellulase, phenoxyethanol, sodium sulfite, essence, pigment and water.

[0041] The isooctadecanoic acid is the isooctadecanoic acid Prisorine 3501 produced by CRODA.

[0042] Among them, the molecular formula of oleic acid is CH3(CH2)7CH=CH(CH2)7COOH, and the iodine value is 90-100gI2 / 100g.

[0043] Among them, tea saponin is produced by Shandong Kunbo Biotechnology Co., Ltd., CAS number: 8047-15-2.

[0044] Among them, the isotridecyl alcohol polyoxyethylene ether is the isotridecyl alcohol polyoxyethylene ether 1310 produced by Guangzhou Jinglong Technology Co., Ltd.

[0045] Among them, coconut oil fatty acid diethanolamide is coconut oil fatty acid diethanolamide 6501 produced by Guangzhou Huazhiwang Chemical Co., Ltd.

[0046] Among them, the whitening agent is BASF's fluorescent whitening agent CBS-X.

[0047] The cellulase is Novozymes' cellulase Fibercare D.

[0048] Wherein, the preparation method of liquid laundry soap comprises the following steps: Step 1: Take deionized water, add tetrasodium glutamate diacetate and sodium sulfite while stirring, and stir evenly at 18 Hz.

[0049] Step 2: Add propylene glycol, triethanolamine, isooctadecanoic acid, and oleic acid, and stir evenly at 10 Hz.

[0050] Step 3: Add alkyl polyglycoside APG08 and stir evenly at 15 Hz.

[0051] Step 4: Add the remaining raw materials and stir evenly at 13Hz to obtain liquid laundry soap.

[0052] Example 2 A liquid laundry soap, which is different from Example 1 in that it comprises the following raw materials: isomeric octadecanoic acid, oleic acid, triethanolamine, cocamidopropyl hydroxysulfobetaine, tea saponin, isomeric tridecyl alcohol polyoxyethylene ether, coconut oil fatty acid diethanolamide, propylene glycol, tetrasodium glutamate diacetate, a brightener, cellulase, phenoxyethanol, sodium sulfite, essence, pigment, and water.

[0053] Wherein, the preparation method of liquid laundry soap comprises the following steps: Step 1: Take deionized water, add tetrasodium glutamate diacetate and sodium sulfite while stirring, and stir evenly at 15 Hz.

[0054] Step 2: Add propylene glycol, triethanolamine, isooctadecanoic acid and oleic acid and stir evenly at 12 Hz.

[0055] Step 3: Add cocamidopropyl hydroxysultaine and stir at 18 Hz.

[0056] Step 4: Add the remaining raw materials and stir evenly at 14Hz to obtain liquid laundry soap.

[0057] Example 3 A liquid laundry soap, which is different from Example 1 in that it comprises the following raw materials: isomeric octadecanoic acid, oleic acid, triethanolamine, cocamidopropyl hydroxysulfobetaine, tea saponin, isomeric tridecyl alcohol polyoxyethylene ether, coconut oil fatty acid diethanolamide, propylene glycol, tetrasodium glutamate diacetate, a brightener, cellulase, phenoxyethanol, sodium sulfite, essence, pigment, and water.

[0058] Wherein, the preparation method of liquid laundry soap comprises the following steps: Step 1: Take deionized water, add tetrasodium glutamate diacetate and sodium sulfite while stirring, and stir evenly at 14 Hz.

[0059] Step 2: Add propylene glycol, triethanolamine, isooctadecanoic acid, and oleic acid, and stir evenly at 10 Hz.

[0060] Step 3: Add cocamidopropyl hydroxysultaine and stir at 15 Hz.

[0061] Step 4: Add the remaining raw materials and stir evenly at 12Hz to obtain liquid laundry soap.

[0062] Example 4 A liquid laundry soap, which is different from Example 1 in that it comprises the following raw materials: isomeric octadecanoic acid, oleic acid, triethanolamine, cocamidopropyl hydroxysulfobetaine, tea saponin, isomeric tridecyl alcohol polyoxyethylene ether, coconut oil fatty acid diethanolamide, propylene glycol, tetrasodium glutamate diacetate, a brightener, cellulase, phenoxyethanol, sodium sulfite, essence, pigment, and water.

[0063] Wherein, the preparation method of liquid laundry soap comprises the following steps: Step 1: Take deionized water, add tetrasodium glutamate diacetate and sodium sulfite under stirring, and stir evenly at 16 Hz; Step 2: Add propylene glycol, neutralizer, isomeric octadecanoic acid, and oleic acid, and stir evenly at 11 Hz; Step 3: Add cocamidopropyl hydroxysulfobetaine and stir evenly at 13Hz; Step 4: Add the remaining raw materials and stir evenly at 15Hz to obtain liquid laundry soap.

[0064] Example 5 A liquid laundry soap, which is different from Example 1 in that it comprises the following raw materials: isomeric octadecanoic acid, oleic acid, triethanolamine, alkyl glycoside APG08, tea saponin, isomeric tridecanol polyoxyethylene ether, coconut oil fatty acid diethanolamide, propylene glycol, tetrasodium glutamate diacetate, whitening agent, cellulase, phenoxyethanol, sodium sulfite, essence, pigment, and water.

[0065] Wherein, the preparation method of liquid laundry soap comprises the following steps: Step 1: Take deionized water, add tetrasodium glutamate diacetate and sodium sulfite under stirring, and stir evenly at 20Hz; Step 2: Add propylene glycol, neutralizer, isomeric octadecanoic acid, and oleic acid, and stir evenly at 14 Hz; Step 3: Add alkyl polyglycoside APG08 and stir evenly at 10 Hz; Step 4: Add the remaining raw materials and stir evenly at 16Hz to obtain liquid laundry soap.

[0066] Example 6 A liquid laundry soap, which is different from Example 1 in that it comprises the following raw materials: isomeric octadecanoic acid, oleic acid, triethanolamine, cocamidopropyl hydroxysulfobetaine, alkyl glycoside APG08, tea saponin, isomeric tridecyl alcohol polyoxyethylene ether, coconut oil fatty acid diethanolamide, propylene glycol, tetrasodium glutamate diacetate, whitening agent, cellulase, phenoxyethanol, sodium sulfite, essence, pigment, and water.

[0067] Wherein, the preparation method of liquid laundry soap comprises the following steps: Step 1: Take deionized water, add tetrasodium glutamate diacetate and sodium sulfite under stirring, and stir evenly at 17 Hz; Step 2: Add propylene glycol, neutralizer, isomeric octadecanoic acid, and oleic acid, and stir evenly at 10 Hz; Step 3: Add cocamidopropyl hydroxysulfobetaine and alkyl glucoside APG08, and stir evenly at 18 Hz; Step 4: Add the remaining raw materials and stir evenly at 20Hz to obtain liquid laundry soap.

[0068] The specific amounts of the raw materials used in Examples 1-6 (unit: kg) are shown in Table 1.

[0069] Table 1: Comparative Example 1 A liquid laundry soap, which is different from Example 1 in that isomeric octadecanoic acid is replaced by stearic acid (straight-chain octadecanoic acid) in equal amounts.

[0070] Comparative Example 2 A liquid laundry soap, which is different from Example 1 in that oleic acid is replaced by stearic acid (straight-chain octadecanoic acid) in equal amounts.

[0071] Comparative Example 3 A liquid laundry soap, which is different from Example 4 in that oleic acid is replaced by isomeric octadecanoic acid in equal amounts.

[0072] Comparative Example 4 A liquid laundry soap, which is different from Example 4 in that isomeric octadecanoic acid is replaced by oleic acid in equal amounts.

[0073] The specific amount of each raw material used in Comparative Examples 1-4 (unit: kg) is shown in Table 2.

[0074] Table 2: Comparative Example 5 A liquid laundry soap, which is different from Example 4 in that it does not contain tea saponin, isomeric tridecanol polyoxyethylene ether, and coconut oil fatty acid diethanolamide.

[0075] Comparative Example 6 A liquid laundry soap, which is different from Example 4 in that isomeric tridecanol polyoxyethylene ether and coconut oil fatty acid diethanolamide are replaced by tea saponin in equal amounts.

[0076] Comparative Example 7 A liquid laundry soap, which is different from Example 4 in that tea saponin and coconut oil fatty acid diethanolamide are replaced by isomeric tridecanol polyoxyethylene ether in equal amounts.

[0077] Comparative Example 8 A liquid laundry soap, which is different from Example 4 in that tea saponin and isomeric tridecanol polyoxyethylene ether are replaced by coconut oil fatty acid diethanolamide in equal amounts.

[0078] Comparative Example 9 A liquid laundry soap, which is different from Example 4 in that tea saponin is replaced by soapberry extract in equal amounts.

[0079] Comparative Example 10 A liquid laundry soap, which is different from Example 4 in that isomeric tridecanol polyoxyethylene ether is replaced by isomeric decanol polyoxyethylene ether in equal amounts.

[0080] Comparative Example 11 A liquid laundry soap, which is different from Example 4 in that an equal amount of coconut oil fatty acid diethanolamide is replaced by fatty alcohol polyoxyethylene ether.

[0081] Performance Verification 1. High and low temperature stability test: Sample: liquid laundry soap of Examples 1-6 and Comparative Examples 1-11.

[0082] Testing method: Tested according to QB / T1224 "Liquid Detergents for Clothes".

[0083] 2. Viscosity detection: Samples: liquid laundry soaps of Examples 1-6 and Comparative Examples 3-11. Since the stability of the liquid laundry soaps of Comparative Examples 1-2 is not of practical value, viscosity testing was not performed.

[0084] Testing method: Tested according to GB / T15357 "Surfactants and detergents - Determination of viscosity and flow properties of liquid products by rotational viscometer".

[0085] 3. Decontamination performance test: Samples: liquid laundry soaps of Examples 1-6 and Comparative Examples 3-11. Since the stability of the liquid laundry soaps of Comparative Examples 1-2 is not of practical value, the decontamination performance test was not performed.

[0086] Testing method: GB / T13174-2021 "Determination of detergency and washing cycle performance of detergents for clothing" test.

[0087] The above test results are shown in Table 3-5: Table 3: Table 4: Table 5: Specifically combined with Examples 1-6, Comparative Examples 1-11, and Tables 3-5, it can be seen that the liquid laundry soaps of Examples 1-6 all perform well in terms of high and low temperature stability, viscosity, and detergency. Examples 4-6 of the present application still have good high and low temperature stability when the fatty acid soap content is as high as 51%.

[0088] Specifically combined with the analysis of Example 1 and Comparative Examples 1-2, it is not difficult to see that after replacing isooctadecanoic acid and oleic acid with stearic acid, the low-temperature stability of the liquid laundry soap is affected. Combined with the analysis of Example 4 and Comparative Examples 3-4, it is not difficult to see that only by adding isooctadecanoic acid or oleic acid alone to the liquid laundry soap, the viscosity and detergency of the liquid laundry soap will fluctuate to a certain extent. It can be seen that the present application overcomes the technical difficulty of maintaining the stability of the liquid laundry soap after the fatty acid soap content in the liquid laundry soap is increased to more than 15% in the prior art through the combination of isooctadecanoic acid and oleic acid, and achieves the technical effect of increasing the fatty acid soap content in the liquid laundry soap to more than 30% and maintaining stability, thereby improving the naturalness, cleaning power and detergency effect of the liquid laundry soap.

[0089] Specifically combined with Example 4 and Comparative Examples 3-11, it is not difficult to see that the co-surfactant composed of tea saponin, isomeric tridecanol polyoxyethylene ether, and coconut oil fatty acid diethanolamide has a certain improvement effect on the detergency and low-temperature stability of liquid laundry soap. It can be seen that tea saponin, isomeric tridecanol polyoxyethylene ether, and coconut oil fatty acid diethanolamide have a certain synergistic effect in liquid laundry soap, which can further enhance the detergency of liquid laundry soap and further improve the low-temperature stability of liquid laundry soap.

[0090] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A liquid laundry soap, characterized in that The invention comprises the following raw materials in percentage by weight: 10%-30% isooctadecanoic acid, 5%-15% oleic acid, 5%-25% neutralizer, 0.1%-1% tea saponin, 0.1%-1% isotridecyl alcohol polyoxyethylene ether, 0.1%-1% coconut oil fatty acid diethanolamide, 1%-10% calcium soap dispersant, 1%-20% solvent, 0.1%-5% chelating agent, 0.01%-1% whitening agent, 0.1%-2% enzyme preparation, 0.01%-1% preservative, 0.01%-1.5% antioxidant, and the balance is water.

2. A liquid laundry soap according to claim 1, characterized in that: The calcium soap dispersant is one or more of sodium fatty alcohol polyoxyethylene ether sulfate AES, N-methyl taurine fatty amide, sodium α-fatty acid methyl ester sulfonate, sulfobetaine, and alkyl glycoside.

3. A liquid laundry soap according to claim 2, characterized in that: The calcium soap dispersant is composed of sulfobetaine and alkyl glycoside, and in terms of the mass percentage of the liquid laundry soap, comprises 0.5%-7% of sulfobetaine and 0.5%-3% of alkyl glycoside.

4. A liquid laundry soap according to claim 1, characterized in that: The neutralizing agent is one or more of potassium hydroxide, sodium hydroxide, monoethanolamine and triethanolamine.

5. A liquid laundry soap according to claim 1, characterized in that: The antioxidant is one or more of citric acid, 6-ethoxy-1,2-dioxy-2,2,4-trimethylquinol, butylated hydroxytoluene and sodium sulfite.

6. A liquid laundry soap according to claim 1, characterized in that: The solvent is one or more of ethanol, propylene glycol, butylene glycol and glycerol.

7. A method for preparing a liquid laundry soap according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Take deionized water, add chelating agent and antioxidant under stirring, and stir evenly; Step 2: Add solvent, neutralizer, isomeric octadecanoic acid and oleic acid and stir evenly; Step 3: Add calcium soap dispersant and stir evenly; Step 4: Add the remaining ingredients and stir well to get liquid laundry soap.

8. The method for preparing liquid laundry soap according to claim 7, characterized in that: The stirring rates of step 1, step 2, step 3 and step 4 are 10-20 Hz.

Images