Diluting use type concentrated laundry detergent with viscosity maintenance function and preparation process of diluting use type concentrated laundry detergent

Abstract

The invention relates to the technical field of detergents, and particularly discloses a dilution use type concentrated laundry detergent with viscosity maintenance and a preparation process thereof. The invention discloses a dilution use type concentrated laundry detergent with viscosity maintenance. Comprising the following raw materials in parts by weight: 15-50 parts of a nonionic surfactant, 1-15 parts of an ampholytic surfactant, 1-15 parts of a cationic surfactant, 5-25 parts of a thickening and leveling modifier, 1-20 parts of a solvent, 0.1-5 parts of a chelating agent, 0.01-0.5 part of a whitening agent, 0.1-2.0 parts of an enzyme preparation, 0.01-0.5 part of a preservative, 0.1-1.0 part of essence, 0.1-0.5 part of a pigment and the balance of deionized water. The cationic surface active agent is alkyl hydroxyethyl dimethyl ammonium chloride; the thickening and leveling modifier is obtained by mixing and reacting acrylic acid and an alcohol ether type nonionic surfactant. The composition disclosed by the invention can be used in the fields of high-end clothes cleaning, baby clothes cleaning and the like, and has the advantages of mildness, no irritation and good dirt-removing power.

Description

Technical Field

[0001] The present application relates to the technical field of detergents, and more specifically, to a concentrated laundry detergent for dilution with viscosity retention and a preparation process thereof. Background Art

[0002] As an important product for daily household cleaning, the performance of laundry detergent directly affects consumers' experience and the washing effect of clothes. In the traditional laundry detergent formula, the main cleaning ingredients are usually compounded by anionic surfactants, nonionic surfactants and amphoteric surfactants. While these ingredients provide strong decontamination ability, they may also bring certain irritation, causing adverse effects on sensitive skin or delicate clothes. In addition, due to the incompatibility with anionic surfactants, the application of cationic surfactants in laundry detergent is limited, which limits the improvement of the performance of laundry detergent in sterilization, antistatic and other aspects.

[0003] With the increase of environmental awareness and the improvement of consumers' requirements for product quality, liquidization and concentration have become important development directions in the detergent industry. Concentrated laundry detergent has gradually become the focus of market attention due to its advantages such as high active matter content, low transportation cost, and reduced packaging waste. However, the washing products on the Chinese market are still mainly ordinary types. Compared with developed countries in Europe and the United States, there is still a large gap in the popularity and market acceptance of concentrated laundry detergent. One of the important reasons is that concentrated laundry detergent is prone to viscosity reduction during dilution and use, which causes consumers to have doubts about its performance and affects the market promotion of the product.

[0004] In the prior art, in order to increase the viscosity of concentrated laundry detergent after dilution, the method of adding thickeners such as inorganic salts, polymers, polyethylene glycol distearate, etc. is often used. However, the addition of these thickeners not only increases the production cost, but also may have an adverse effect on the environmental protection and biodegradability of the detergent. At the same time, these thickeners cannot fundamentally solve the problem of viscosity reduction of concentrated laundry detergent during dilution, especially when the dilution multiple is high, the viscosity reduction is more obvious.

[0005] In addition, existing concentrated laundry detergent formulas generally contain anionic surfactants, which, although having strong decontamination ability, may also cause irritation and environmental pollution problems. Therefore, it is particularly important to research and develop a concentrated laundry detergent that does not contain anionic surfactants, is environmentally friendly and mild, and can still maintain a certain viscosity after dilution. Summary of the invention

[0006] In order to improve the viscosity retention and decontamination ability of laundry detergent during the re-dilution process, the present application provides a concentrated laundry detergent for dilution with viscosity retention and a preparation process thereof.

[0007] In the first aspect, the present application provides a concentrated laundry detergent for dilution with viscosity retention, which adopts the following technical solution: A concentrated laundry detergent for dilution with viscosity retention, comprising the following raw materials in parts by weight: 15-50 parts of nonionic surfactant, 1-15 parts of amphoteric surfactant, 1-15 parts of cationic surfactant, 5-25 parts of thickening and leveling modifier, 1-20 parts of solvent, 0.1-5 parts of chelating agent, 0.01-0.5 parts of brightener, 0.1-2.0 parts of enzyme preparation, 0.01-0.5 parts of preservative, 0.1-1.0 parts of flavor, 0.1-0.5 parts of pigment, and the balance is water; The cationic surfactant is alkyl hydroxyethyl dimethyl ammonium chloride; The thickening and leveling modifier is obtained by mixing acrylic acid and alcohol ether type nonionic surfactant.

[0008] By adopting the above technical solution, nonionic, amphoteric and cationic surfactants work synergistically in the washing process, and the stains are separated from the clothes and suspended in the water by reducing the surface tension of water, penetrating the inside of the fiber, emulsifying the stains, etc., and then the stains are taken away by the rinsing process. In the washing process, nonionic, amphoteric and cationic surfactants respectively exert their unique washing properties. The lipophilic groups in the nonionic surfactants bind to the stains, and the hydrophilic groups bind to water, thereby stripping the stains from the surface of the clothes; the amphoteric surfactants interact with water and stains at the same time through their unique molecular structure to enhance the washing effect; the cationic surfactants use their positive charge to interact with the negative charge of bacteria and other microorganisms to destroy their cell walls to achieve a bactericidal effect. The specific selection of alkyl hydroxyethyl dimethyl ammonium chloride effectively enhances the adsorption of fibers, helps other surfactants better penetrate into the fibers, and improves the cleaning efficiency. At the same time, the thickening and leveling modifier increases the viscosity and fluidity of the detergent through the entanglement and adsorption of its polymer chain. It is obtained by mixing acrylic acid with alcohol ether type nonionic surfactant. This modifier can not only increase the viscosity of the laundry detergent, making it easier to control the dosage when using it, but also maintain the stability of the laundry detergent during the dilution process to prevent stratification or precipitation; the chelating agent combines with the metal ions in the water to form a stable complex to prevent it from having an adverse effect on the performance of the detergent. Other additives play their roles in whitening, stain removal, antiseptic, fragrance and coloring to jointly improve the comprehensive performance of the detergent.

[0009] The pH adjusters are citric acid and sodium hydroxide; the solvent is propylene glycol; the chelating agent is tetrasodium glutamate diacetate; the whitening agent can be conventional detergent whitening agents such as CBW series and CBS series; the enzyme preparation can be protease or cellulase; the preservative is any one of kason, phenoxyethanol and potassium sorbate.

[0010] Optionally, the weight ratio of the alkyl hydroxyethyl dimethyl ammonium chloride to the thickener and leveling modifier is 1-2:1-5.

[0011] By adopting the above technical solution, when the weight ratio of the cationic surfactant to the thickener and leveling modifier is 1-2:1-5, the formula has good re-dilution viscosity stability and can maintain good re-dilution viscosity stability without the need for inorganic salt auxiliary thickening.

[0012] As a cationic surfactant, alkyl hydroxyethyl dimethyl ammonium chloride forms snake-like rod-shaped micelles in water. These micelles are intertwined and interwoven to build a preliminary network structure, providing a preliminary viscosity and stability basis for the laundry detergent system. The molecular chain of the thickening and leveling modifier forms a complex three-dimensional hydration network by forming a long chain of hydration and expansion with water molecules, which enhances the physical stability of the system, and also increases the viscosity of the system through intermolecular interactions, and builds a complex three-dimensional hydration network and network structure.

[0013] Furthermore, the networks of the two components, alkyl hydroxyethyl dimethyl ammonium chloride and thickening modifier, are intertwined, which effectively improves the viscosity retention ability of the laundry detergent during the re-dilution process. The diluted laundry detergent still has good viscosity, so that the laundry detergent can better adhere to the surface of clothes and prolong the contact time with stains, thereby improving the cleaning effect of the laundry detergent.

[0014] Optionally, the nonionic surfactant includes linear or branched fatty alcohol polyoxyethylene ether, ethoxylates of oils and fats and their derivatives; wherein the carbon chain length of the linear or branched fatty alcohol polyoxyethylene ether is 8-15, and the degree of ethylene oxide polymerization is 7-9.

[0015] Optionally, the fatty alcohol polyoxyethylene ether is selected from AEO7 / 9 with a linear 12-14 carbon ethylene oxide degree of polymerization of 7 and 9 produced by Dow Chemical Company, TO7 / 8 with an isomeric 13 carbon ethylene oxide degree of polymerization of 7 and 8 produced by BASF, and XP70 / 90 with an isomeric 10 carbon ethylene oxide degree of polymerization of 7 and 9; linear fatty alcohol polyalkoxy ether, with a carbon chain length of 12-15 and a sum of the degrees of polymerization of ethylene oxide and propylene oxide of 9-12, such as EP2445 / 2454 with a linear 12-14 carbon alkoxy degree of polymerization of 9 and EP2584 with a linear 12-15 carbon alkoxy degree of polymerization of 12 produced by Clariant.

[0016] Optionally, the ethoxylates of oils and fats and their derivatives are selected from modified oil ethoxylates SOE and fatty acid methyl ester ethoxylates FMEE produced by China Daily Chemical Research Institute Co., Ltd.

[0017] Optionally, the weight ratio of the linear or branched fatty alcohol polyoxyethylene ether to the ethoxylate of oils and fats and their derivatives is 6-9:1-3.

[0018] Optionally, the amphoteric surfactant is any one of lauramidopropyl betaine, cocoamidopropyl betaine, lauramidopropyl amine oxide, and cocoamidopropyl amine oxide.

[0019] By adopting the above technical scheme, the laundry detergent of the present application does not add anionic surfactants, but still maintains good cleaning ability. The linear or branched fatty alcohol polyoxyethylene ether is selected to have excellent wetting and emulsifying ability, can quickly penetrate into the fiber, and separate the stains from the surface of the clothing or the gap between the fibers. The carbon chain length is specifically limited to 8-15, and the ethoxylate of oil and its derivatives with good water solubility and stability is used to effectively emulsify and disperse stains such as oil and grease, forming a powerful decontamination system and improving the cleaning ability of the laundry detergent. At the same time, the two are less sensitive to water quality, can maintain a stable washing effect under different water quality conditions, and the mixed use improves the physical stability of the laundry detergent.

[0020] At the same time, the hydrophilic chain segments of the selected non-ionic surfactant participate in the construction of a three-dimensional hydration network, further enhancing the hydration effect, making the network structure more compact and stable, and cooperating with the thickening and leveling modifier to further improve the viscosity retention ability of the laundry detergent during the re-dilution process.

[0021] Optionally, the preparation of the thickening and leveling modifier comprises the following steps: Acrylic acid and alcohol ether type nonionic surfactant are added into water and stirred evenly, a catalyst is added, heated to 60-90° C., stirred and reacted for 5-6 hours, filtered and dried to obtain the thickening and leveling modifier.

[0022] By adopting the above technical solution, the acrylic polymer molecular chain contains a large number of hydrophilic groups, which can form hydrogen bonds with water molecules, thereby attracting and fixing a large number of water molecules. At the same time, the hydrophilic chain segments of the alcohol ether type nonionic surfactant also participate in this process, further enhancing the hydration effect. As the water molecules are adsorbed and fixed, the acrylic polymer and the alcohol ether type nonionic surfactant jointly construct a complex three-dimensional hydration network. This network structure can effectively limit the free movement of water molecules in the system, thereby increasing the physical stability of the system.

[0023] The formation of a three-dimensional hydration network also enhances the interaction between molecules in the system, increases the entanglement and friction between molecular chains, and increases the viscosity of the system. At the same time, the interaction between acrylic acid polymers and alcohol ether type nonionic surfactants further increases the viscosity of the system and improves the dilution viscosity stability of the laundry detergent. This allows the laundry detergent to spread quickly and evenly on the surface of the clothing, helping to improve the cleaning effect of the laundry detergent.

[0024] Optionally, the alcohol ether type nonionic surfactant in the thickening and leveling modifier is a branched alcohol ether nonionic surfactant.

[0025] By adopting the above technical solution, a branched alcohol ether nonionic surfactant is selected, which has stronger wettability and permeability, which helps the laundry detergent to penetrate better and remove stains. The branched alcohol ether nonionic surfactant makes the interaction between molecules more complex, which helps to enhance the thickening stability of the laundry detergent.

[0026] In a second aspect, the present application provides a concentrated laundry detergent for dilution with viscosity retention, which adopts the following technical solution: A method for preparing a concentrated laundry detergent for dilution with viscosity retention comprises the following steps: (1) fully stirring and mixing the nonionic surfactant and the thickening and leveling modifier, and adjusting the pH value to 8-9 with a pH adjuster to prepare phase A for use; (2) Stirring the amphoteric surfactant and the cationic surfactant for 5-10 minutes to mix evenly to prepare phase B for later use; (3) Mix deionized water, solvent, and chelating agent and stir for 3-5 minutes to fully dissolve them to prepare phase C for later use; (4) While stirring, phase A and phase B are slowly added to phase C in sequence, and stirred at 40-50° C. for 10-20 minutes; (5) the temperature is lowered to below 30° C., and whitening agent, enzyme preparation, preservative, flavor, and pigment are added, and stirred evenly to obtain the laundry detergent.

[0027] By adopting the above technical scheme and selecting a suitable pH value, the penetration of the laundry detergent into dirt can be improved, so that the surfactant can exert its maximum decontamination function without damaging clothing fibers and hand skin. By using a step-by-step dissolution and mixing method, the raw materials are helped to fully contact and react to obtain a concentrated laundry detergent with good dilution viscosity stability and decontamination ability.

[0028] In summary, this application has the following beneficial effects: 1. This application uses a carefully proportioned formula of nonionic, amphoteric and cationic surfactants to synergistically form a powerful decontamination system. Nonionic surfactants effectively remove stains, amphoteric surfactants enhance the washing effect, and cationic surfactants interact with the negative charges of bacteria and other microorganisms through their positive charges to achieve a bactericidal effect and enhance the adsorption of fibers, helping other surfactants to better penetrate into the fibers, significantly improving cleaning efficiency.

[0029] 2. In this application, a thickening and leveling modifier obtained by mixing acrylic acid and alcohol ether type nonionic surfactant is preferably used in combination with alkyl hydroxyethyl dimethyl ammonium chloride to construct a complex three-dimensional hydration network and mesh structure, which effectively improves the viscosity and dilution viscosity stability of the laundry detergent. Even during dilution, the laundry detergent can still maintain good viscosity, allowing it to better adhere to the surface of clothing, prolonging the contact time with stains, thereby improving the cleaning effect.

[0030] 3. The concentrated laundry detergent prepared in the present application adopts environmentally friendly and safe formula raw materials, and still has good decontamination and cleaning effects without adding anionic surfactants, ensuring the safety of the product to the human body and the environment. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with embodiments.

[0032] If the specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be purchased from the market.

[0033] Alkyl hydroxyethyl dimethyl ammonium chloride was purchased from Clariant, model: HY; flavor was purchased from Dongying Huaxuan Biotechnology Co., Ltd.; isomeric decanol polyoxyethylene ether was purchased from Taizhou Jiayin Chemical Co., Ltd., model 1003; acrylic acid was purchased from Shandong Luying Chemical Co., Ltd., CAS No. 79-10-7, transparent liquid density 1.051G / ML; pigment was purchased from Shandong Baiqianhui Biotechnology Co., Ltd., the main ingredient was brilliant blue.

[0034] Preparation examples of raw materials and / or intermediates Preparation Example 1 A thickening and leveling modifier, the preparation of which comprises the following steps: 30 kg of acrylic acid and 10 kg of lauryl alcohol polyoxyethylene ether AEO-9 (alcohol ether type nonionic surfactant) were added into water and stirred evenly to form a uniform emulsion, 2 kg of ammonium persulfate was added and stirred evenly to disperse, and then heated to 60° C. and stirred for reaction for 6 hours, cooled to room temperature, filtered and dried to obtain the thickening and leveling modifier.

[0035] Preparation Example 2 A thickening and leveling modifier, the preparation of which comprises the following steps: 50 kg of acrylic acid and 10 kg of lauryl alcohol polyoxyethylene ether AEO-9 (alcohol ether type nonionic surfactant) were added into water and stirred evenly to form a uniform emulsion, 4 kg of ammonium persulfate was added and stirred evenly to disperse, and then heated to 90° C. and stirred for reaction for 5 hours, cooled to room temperature, filtered and dried to obtain the thickening and leveling modifier.

[0036] Preparation Example 3 A thickening and leveling modifier, the preparation of which comprises the following steps: 30 kg of acrylic acid and 10 kg of lauryl alcohol polyoxyethylene ether AEO-9 (alcohol ether type nonionic surfactant) were added into water and stirred evenly to form a uniform emulsion, 2 kg of ammonium persulfate was added and stirred evenly to disperse, and then heated to 60° C. and stirred for reaction for 6 hours, cooled to room temperature, filtered and dried to obtain the thickening and leveling modifier.

[0037] Preparation Example 4 A thickening and leveling modifier is provided, which is different from Preparation Example 1 in that the alcohol ether type nonionic surfactant in this Preparation Example is isomeric decanol polyoxyethylene ether.

[0038] Comparative Preparation Example 1 A thickening and leveling modifier, the preparation of which comprises the following steps: 30 kg of acrylic acid was added into water and stirred evenly to form a uniform emulsion, 2 kg of ammonium persulfate was added and stirred evenly to disperse, and then heated to 60° C. and stirred to react for 6 hours, cooled to room temperature, filtered and dried to obtain the thickening and leveling modifier. Example

[0039] Example 1 A concentrated laundry detergent for dilution with viscosity retention, the preparation of which comprises the following steps: (1) 32 kg of nonionic surfactant and 8 kg of thickening and leveling modifier were fully stirred and mixed, and the pH value was adjusted to 9 with citric acid to prepare phase A for use; (2) stirring 1 kg of lauramide propyl betaine and 15 kg of alkyl hydroxyethyl dimethyl ammonium chloride for 8 minutes to mix evenly to prepare phase B for later use; (3) Add 10 kg of propylene glycol (solvent) and 3 kg of tetrasodium glutamate diacetate (chelating agent) into water and stir for 3 minutes to fully dissolve to prepare phase C for use; (4) While stirring, slowly add phase A and phase B to phase C in sequence and stir at 45°C for 15 minutes; (5) Cooling to below 30°C, adding 0.15kg whitening agent, 1.5kg protease (enzyme preparation), 0.05kg phenoxyethanol (preservative), 0.5kg essence, 0.5kg pigment in sequence, and adding deionized water to make up the raw materials to 100kg, stirring evenly, to prepare the laundry detergent. The nonionic surfactant is a mixture of a fatty alcohol polyoxyethylene ether with a linear chain of 12-14 and an ethylene oxide polymerization degree of 7 and a fatty acid methyl ester ethoxylate in a weight ratio of 7:2, and the thickening and leveling modifier is prepared in Preparation Example 1.

[0040] Example 2 A concentrated laundry detergent for dilution with viscosity retention, the preparation of which comprises the following steps: (1) 50 kg of nonionic surfactant and 25 kg of thickening and leveling modifier were fully stirred and mixed, and the pH value was adjusted to 9 with citric acid to prepare phase A for use; (2) Stir 8 kg of lauramide propyl betaine and 1 kg of alkyl hydroxyethyl dimethyl ammonium chloride for 5 minutes to mix well to prepare phase B for later use; (3) Add 5 kg of propylene glycol (solvent) and 0.1 kg of tetrasodium glutamate diacetate (chelating agent) into water and stir for 5 minutes to fully dissolve them to prepare phase C for use; (4) While stirring, slowly add phase A and phase B to phase C in sequence and stir at 50°C for 10 minutes; (5) Cooling to below 30°C, adding 0.5kg whitening agent, 0.1kg protease (enzyme preparation), 0.5kg phenoxyethanol (preservative), 1kg essence, 0.1kg pigment, and adding deionized water to make up the raw materials to 100kg, stirring evenly, and preparing the laundry detergent. The nonionic surfactant is a mixture of a fatty alcohol polyoxyethylene ether with a linear chain of 12-14 and an ethylene oxide polymerization degree of 7 and a fatty acid methyl ester ethoxylate in a weight ratio of 2:1, and the thickening and leveling modifier is prepared in Preparation Example 2.

[0041] Example 3 A concentrated laundry detergent for dilution with viscosity retention, the preparation of which comprises the following steps: (1) 15 kg of nonionic surfactant and 15 kg of thickening and leveling modifier were fully stirred and mixed, and the pH value was adjusted to 8 with citric acid to prepare phase A for use; (2) stirring 15 kg of lauramide propyl betaine and 10 kg of alkyl hydroxyethyl dimethyl ammonium chloride for 8 minutes to mix evenly to prepare phase B for later use; (3) Add 20 kg of propylene glycol (solvent) and 5 kg of tetrasodium glutamate diacetate (chelating agent) into water and stir for 3 minutes to fully dissolve to prepare phase C for use; (4) While stirring, slowly add phase A and phase B to phase C in sequence and stir at 45°C for 15 minutes; (5) Cooling to below 30°C, adding 0.01kg whitening agent, 2kg protease (enzyme preparation), 0.01kg phenoxyethanol (preservative), 0.1kg essence, 0.2kg pigment in sequence, and adding deionized water to make up the raw materials to 100kg, stirring evenly, to prepare the laundry detergent. The nonionic surfactant is a mixture of a fatty alcohol polyoxyethylene ether with a linear chain of 12-14 and an ethylene oxide polymerization degree of 7 and a fatty acid methyl ester ethoxylate in a weight ratio of 9:1, and the thickening and leveling modifier is prepared in Preparation Example 3.

[0042] Example 4 A concentrated laundry detergent for dilution with viscosity retention, which is different from Example 1 in that 11.5 kg of alkyl hydroxyethyl dimethyl ammonium chloride and 11.5 kg of thickening Liu Ping modifier are added in this embodiment.

[0043] Example 5 A concentrated laundry detergent for dilution with viscosity retention, which is different from Example 1 in that 4 kg of alkyl hydroxyethyl dimethyl ammonium chloride and 19 kg of thickening Liu Ping modifier are added in this embodiment.

[0044] Example 6 A concentrated laundry detergent for dilution with viscosity retention, which is different from Example 1 in that the nonionic surfactant in this example is a fatty alcohol polyoxyethylene ether with a linear chain of 12-14 and an ethylene oxide polymerization degree of 7.

[0045] Example 7 A concentrated laundry detergent for dilution with viscosity retention, which is different from Example 1 in that the nonionic surfactant in this example is fatty acid methyl ester ethoxylate.

[0046] Example 8 A concentrated laundry detergent for dilution with viscosity retention, which is different from Example 1 in that the thickening and leveling modifier used in this example is a carboxymethyl cellulose aqueous solution purchased from Shandong Lijian Chemical Co., Ltd.

[0047] Example 9 A concentrated laundry detergent for dilution with viscosity retention is provided. The difference from Example 1 is that the thickening and leveling modifier used in this example is prepared in Preparation Example 4.

[0048] Comparative Example Comparative Example 1 A concentrated laundry detergent for dilution with viscosity retention, which is different from Example 1 in that no cationic surfactant is added in the present application.

[0049] Comparative Example 2 A concentrated laundry detergent for dilution with viscosity retention, which is different from Example 1 in that the cationic surfactant added in the present application is benzalkonium chloride.

[0050] Comparative Example 3 A concentrated laundry detergent for dilution with viscosity retention, which is different from Example 1 in that the thickening and leveling modifier used in the present application is prepared by Comparative Preparation Example 1.

[0051] Performance testing Detection method / test method At 25°C, the dilution water is 250mg / kg hard water prepared according to GB / T 13174. Viscosity test: Use NDJ-1 type viscometer to test the viscosity, test the initial viscosity of the laundry detergent prepared in the above embodiment and comparative example and the viscosity value after five times dilution with water, and record; Stability: The stability of the laundry detergent was tested according to the method specified in QB / T 1224-2012 "Liquid Detergents for Clothes". The laundry detergent was kept at (40±2)℃ for 24 hours and then returned to room temperature and at (-5±2)℃ for 24 hours. If the state of the laundry detergent after returning to room temperature did not change significantly compared with that before the experiment, its stability was recorded as good. If there was slight stratification or discoloration, or a small amount of precipitation, it was recorded as poor.

[0052] Table 1 Stability test results Table 2 Test results Combining Examples 1-3 and Comparative Example 1 and Tables 1-2, it can be seen that the experimental data of Examples 1-3 are better than those of Comparative Example 1, indicating that the addition of cationic surfactants can cooperate with the thickening and leveling modifiers to form a network structure, effectively improving the viscosity retention ability of the laundry detergent during the re-dilution process, while extending its contact time with the stains, so that it can better penetrate into the fibers to emulsify the stains, separate the stains from the clothes, and improve the cleaning ability of the laundry detergent.

[0053] Combining Examples 1-3 and Comparative Example 2 and Tables 1-2, it can be seen that the experimental data of Examples 1-3 are better than those of Comparative Example 2, indicating that the selection of cationic surfactants affects the performance of the final laundry detergent. The selection of alkyl hydroxyethyl dimethyl ammonium chloride can help improve the cleaning efficiency of the laundry detergent due to its good adsorption and penetration capabilities. At the same time, it can be intertwined with the hydration network formed by acrylic acid and alcohol ether type nonionic surfactants, thereby improving the viscosity retention ability of the laundry detergent during the re-dilution process.

[0054] Combining Examples 1-3, Example 8 and Comparative Example 3 and Tables 1-2, it can be seen that the experimental data of Examples 1-3 are better than those of Comparative Example 3, indicating that the thickening and leveling modifier prepared by the reaction of acrylic acid and alcohol ether type nonionic surfactant can have a better synergistic effect with other raw materials in the raw material formula, especially alkyl hydroxyethyl dimethyl ammonium chloride, and interact with each other to improve the various properties of the laundry detergent.

[0055] Combining Examples 1-5 and the data in Table 1-2, it can be seen that when the added weight ratio of alkyl hydroxyethyl dimethyl ammonium chloride and thickener leveling modifier is in the range of 1-2:1-5, the two can better interweave and entangle with each other to form a three-dimensional hydration network and a mesh structure, forming a stable system. The two cooperate with each other to jointly adjust the viscosity of the system. Alkyl hydroxyethyl dimethyl ammonium chloride effectively reduces the cleaning tension between stains and water, enhances the emulsification effect, and cooperates with the thickening modifier to further improve the permeability and detergency of the washing liquid. The appropriate ratio can maximize the synergistic effect of these properties, improve the cleaning effect of the laundry detergent and the stability of the diluted viscosity.

[0056] Combining Example 1 with Examples 6-7 and Table 1-2, it can be seen that the experimental data of Example 1 are better than those of Examples 6-7, indicating that the selection of linear or branched fatty alcohol polyoxyethylene ether in combination with ethoxylates of oils and their derivatives as non-ionic surfactants gives the laundry detergent good cleaning performance, can effectively emulsify and disperse stains such as oils and greases, and form a powerful decontamination system, thereby improving the cleaning ability of the laundry detergent and improving the stability of the laundry detergent.

[0057] Combining Example 1 with Example 9 and Table 1-2, it can be seen that the experimental data of Example 9 are better than those of Example 1, indicating that the branched alcohol ether nonionic surfactant selected in the thickening modifier has better wettability and permeability, and the interaction with the acrylic acid molecular chain is more complex, forming an interactive network structure, thereby further improving the dilution viscosity stability and cleaning ability of the laundry detergent.

[0058] 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 concentrated laundry detergent for dilution with viscosity retention, characterized in that: The composition comprises the following raw materials in parts by weight: 15-50 parts of nonionic surfactant, 1-15 parts of amphoteric surfactant, 1-15 parts of cationic surfactant, 5-25 parts of thickening and leveling modifier, 1-20 parts of solvent, 0.1-5 parts of chelating agent, 0.01-0.5 parts of brightener, 0.1-2.0 parts of enzyme preparation, 0.01-0.5 parts of preservative, 0.1-1.0 parts of flavor, 0.1-0.5 parts of pigment, and the balance is deionized water; The cationic surfactant is alkyl hydroxyethyl dimethyl ammonium chloride; The thickening and leveling modifier is obtained by mixing acrylic acid and alcohol ether type nonionic surfactant.

2. The concentrated laundry detergent for dilution with viscosity retention according to claim 1, characterized in that: The weight ratio of the alkyl hydroxyethyl dimethyl ammonium chloride to the thickener and leveling modifier is 1-2:1-5.

3. The concentrated laundry detergent for dilution with viscosity retention according to claim 1, characterized in that: The nonionic surfactant includes linear or branched fatty alcohol polyoxyethylene ether, ethoxylates of oils and fats and their derivatives; wherein the carbon chain length of the linear or branched fatty alcohol polyoxyethylene ether is 8-15, and the degree of ethylene oxide polymerization is 7-9.

4. The concentrated laundry detergent for dilution with viscosity retention according to claim 3, characterized in that: The weight ratio of the linear or branched fatty alcohol polyoxyethylene ether to the ethoxylate of oil and fat and its derivatives is 6-9:1-3.

5. The concentrated laundry detergent for dilution with viscosity retention according to claim 1, characterized in that: The amphoteric surfactant is any one of lauramidopropyl betaine, cocoamidopropyl betaine, lauramidopropyl amine oxide and cocoamidopropyl amine oxide.

6. The concentrated laundry detergent for dilution with viscosity retention according to claim 1, characterized in that: The preparation of the thickening and leveling modifier comprises the following steps: Acrylic acid and alcohol ether type nonionic surfactant are added into water and stirred evenly, a catalyst is added, heated to 60-90° C., stirred and reacted for 5-6 hours, filtered and dried to obtain the thickening and leveling modifier.

7. The concentrated laundry detergent for dilution with viscosity retention according to claim 1, characterized in that: The mixing weight ratio of the acrylic acid to the alcohol ether type nonionic surfactant is 3-5:

1.

8. The concentrated laundry detergent for dilution with viscosity retention according to claim 1, characterized in that: The alcohol ether type nonionic surfactant in the thickening and leveling modifier is a branched alcohol ether nonionic surfactant.

9. A process for preparing the concentrated laundry detergent for dilution with viscosity retention according to any one of claims 1 to 8, comprising the following steps: (1) Fully stir and mix the nonionic surfactant and the thickening and leveling modifier, and adjust the pH value to 8-9 with a pH adjuster to prepare phase A for use; (2) Stir the amphoteric surfactant and the cationic surfactant for 5-10 minutes to mix them evenly to prepare phase B for later use; (3) Mix deionized water, solvent, and chelating agent and stir for 3-5 minutes to fully dissolve them to prepare phase C for use; (4) While stirring, slowly add phase A and phase B to phase C in sequence and stir at 40-50°C for 10-20 minutes; (5) Cooling the mixture to below 30° C., adding a whitening agent, an enzyme preparation, a preservative, a flavor, and a pigment, and stirring the mixture evenly to obtain the laundry detergent.

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