Water-based cleaning agent composition and preparation method thereof

Abstract

The invention discloses a water-based cleaning agent composition and a preparation method thereof, belongs to the technical field of cleaning agent processing, and is used for solving the technical problem that the degreasing performance, the corrosion resistance, the environmental protection property and the anti-rust property of a water-based cleaning agent composition in the prior art need to be further improved. The preparation method comprises the following steps: by taking a modified surfactant I and a modified surfactant II as basic substrates, deionized water as a solvent and a modified dispersant and an auxiliary agent as auxiliary additives, compounding according to a weight ratio to obtain the water-based cleaning agent composition. A nonionic modified surfactant I, an anionic modified surfactant II, a modified dispersant and an auxiliary agent are compounded to synergistically improve the degreasing performance, the corrosion resistance, the environmental protection property and the rust resistance of the water-based cleaning agent composition.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning agent processing, and in particular to a water-based cleaning agent composition and a preparation method thereof. Background Art

[0002] Aluminum has the advantages of low density, good corrosion resistance and good plasticity. It is widely used in major high-tech industries such as national defense industry, aerospace, and automobile manufacturing. It is an important basic material for contemporary science and technology industries. However, aluminum is relatively soft and has poor wear resistance compared to metals such as iron and copper. It is prone to problems such as strain and breakage during processing. In order to avoid damage to aluminum products during the production process, it is often necessary to use stamping and stretching oil with good lubrication properties. This results in the surface of aluminum products being stained with many oil pollutants containing oil and dust particles after stamping, stretching and other processes. Traditional industrial cleaning agents are difficult to clean and may also cause corrosion on the surface of aluminum products. Therefore, water-based cleaning agents are a good choice for cleaning aluminum metal oil stains.

[0003] Water-based metal cleaners are made of water as solvent, surfactants as main body and a variety of additives. The main working principle is to remove dirt from the aluminum metal surface through wetting, emulsification, penetration, separation, dispersion and solubilization. When water-based cleaners are used to clean oil stains on the aluminum metal surface, the emulsification and dispersion performance of the cleaner is poor. It is difficult for oil droplets to form a stable emulsified state in the cleaner, which makes it easy for oil stains to settle again. The cleaning effect of the metal surface needs to be further improved. In addition, when water-based cleaners are used to clean metal objects, they also cause certain corrosion to the metal.

[0004] In view of the technical defects in this aspect, a solution is now proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a water-based cleaning agent composition and a preparation method thereof, which are used to solve the technical problem that the water-based cleaning agent composition in the prior art needs to be further improved in terms of degreasing performance, corrosion resistance, environmental protection and rust prevention performance.

[0006] The purpose of the present invention can be achieved by the following technical scheme: a water-based cleaning agent composition, comprising the following components in parts by weight: 20-30 parts of modified surfactant I, 20-30 parts of modified surfactant II, 5-7 parts of modified dispersant, 15-20 parts of auxiliary agent and 40-65 parts of deionized water.

[0007] Furthermore, the preparation method of the modified surfactant I comprises the following steps: A1. In a nitrogen atmosphere, isostearyl succinic anhydride, L-norvaline, 4-dimethylaminopyridine and acetone were placed in a three-necked flask, heated to 40-55°C, kept warm for 2-3 hours, and post-treated to obtain a modified surfactant I precursor; A2. Place the modified surfactant I precursor, 2-[2-(2-butoxyethoxy)ethoxy]ethanol, HATU, DIPEA and dichloromethane in a three-necked flask, react at room temperature for 5-6 hours, and post-treat to obtain the modified surfactant I.

[0008] The synthetic reaction equation of modified surfactant I is:

[0009] The synthetic reaction principle of modified surfactant I is: During the reaction, 4-dimethylaminopyridine was used as a catalyst to catalyze the nucleophilic addition reaction of isostearyl succinic anhydride and L-norvaline to generate a modified surfactant I precursor. HATU formed a strong coordination effect with the oxygen atom in the carboxylic acid, thereby enhancing the reactivity of the carboxyl group of the modified surfactant I precursor. The activated carboxyl group reacted with the hydroxyl group of 2-[2-(2-butoxyethoxy)ethoxy]ethanol to generate modified surfactant I.

[0010] Furthermore, the dosage ratio of the isostearyl succinic anhydride, L-norvaline, 4-dimethylaminopyridine and acetone is 3.2-5g:1.3-2g:0.14-0.2g:50-80mL, and the post-treatment step comprises: after the reaction is completed, 300-400mL of ethyl acetate and 300-400mL of deionized water are added to the three-necked flask, the organic phase is washed 1-2 times with deionized water, the organic phase is transferred to a rotary evaporator with a water bath temperature of 40-45°C, and the reduced pressure rotary evaporation is performed until there is no liquid. Extract to obtain a modified surfactant I precursor; in step A2, the amount ratio of the modified surfactant I precursor, 2-[2-(2-butoxyethoxy)ethoxy]ethanol, HATU, DIPEA and dichloromethane is 2-5g:2.2-5.1g:4.1-9.5g:2.8-3.2g:50-100mL, and the post-treatment step includes: after the reaction is completed, the three-necked flask is heated to 50-60°C, and the reduced pressure distillation is performed until no liquid is extracted to obtain the modified surfactant I.

[0011] Furthermore, the preparation method of the modified surfactant II comprises the following steps: B1. Vinyltrimethoxysilane, trimethylchlorosilane and isopropanol are placed in a three-necked flask, heated to 45-55°C, kept warm for 0.5-1h, deionized water is added, kept warm for 2-3h, and post-treated to obtain intermediate I; The synthetic reaction equation of intermediate I is:

[0012] The synthetic reaction principle of intermediate Ⅰ is: During the reaction, the hydroxyl group of isopropanol attacks the chlorine atom in trimethylchlorosilane, generating SN2 nucleophilic substitution to generate trimethylsiloxyisopropanol and HCl. Under the catalysis of HCl, vinyltrimethoxysilane is hydrolyzed to generate vinyltrisilanol. The hydroxyl group of vinyltrisilanol attacks the silicon-oxygen bond of trimethylsiloxyisopropanol, breaking the silicon-oxygen bond to obtain intermediate Ⅰ. The mass spectrometry analysis data of intermediate I are: 322.10 (100.0%), 323.10 (32.7%), 324.09 (13.4%), 324.10 (5.3%), 325.10 (2.2%), 325.09 (2.0%).

[0013] B2. Place intermediate I, mercaptopropionic acid, benzoin dimethyl ether and tetrahydrofuran in a three-necked flask, heat to 40-50°C, irradiate under ultraviolet light and stir for 15-25 minutes, and post-treat to obtain intermediate II; The synthetic reaction equation of intermediate II is:

[0014] The synthetic reaction equation of intermediate II is: During the reaction, benzoin dimethyl ether generates free radicals under ultraviolet light, which triggers nucleophilic addition of intermediate Ⅰ and mercaptopropionic acid to obtain intermediate Ⅱ; The mass spectrometry analysis data of intermediate II are: 428.17 (100.0%), 429.17 (36.9%), 430.16 (17.9%), 430.17 (7.2%), 431.17 (3.7%), 431.16 (3.1%), 432.16 (1.6%).

[0015] B3. Place intermediate II and methanol in a three-necked flask, add sodium hydroxide solution, adjust the pH to 8-9, raise the temperature to 45-55°C, and post-treat to obtain surfactant II.

[0016] The synthetic reaction equation of surfactant II is:

[0017] The synthetic reaction principle of surfactant II is: Under alkaline conditions, intermediate II undergoes acid-base neutralization to generate surfactant II; The mass spectrometry data of surfactant II are: 450.15 (100.0%), 451.15 (36.8%), 452.14 (17.9%), 452.15 (7.1%), 453.15 (3.6%), 453.14 (3.1%), 454.14 (1.5%) Further, in step B1, the volume ratio of vinyltrimethoxysilane, trimethylchlorosilane, isopropanol and deionized water is 1-2:4.7-9.0:2.5-5:1-2, and the post-treatment step comprises: after the reaction is completed, the reaction solution is cooled to room temperature, the reaction solution is transferred to a separatory funnel, washed with deionized water 1-2 times, and the organic phase is transferred to a rotary evaporator with a water bath temperature of 40-45°C, and the reduced pressure rotary evaporation is performed until no liquid is extracted to obtain intermediate I; in step B2, the amount ratio of intermediate I, mercaptopropionic acid, benzoin dimethyl ether and tetrahydrofuran is 3.2-4g:1-1.5g:0 .05-0.1g:30-50mL, the post-treatment step includes: after the reaction is completed, the reaction solution is transferred to a rotary evaporator with a water bath temperature of 40-45°C, and the reaction solution is evaporated under reduced pressure until no liquid is produced, and the reaction solution is washed with petroleum ether 1-2 times and dried to obtain intermediate II; in step B3, the concentration of the sodium hydroxide solution is 1.5-2mol / L, and the amount ratio of the intermediate II to methanol is 1-2g:15-30mL. The post-treatment step includes: after the reaction is completed, the reaction solution is transferred to a rotary evaporator with a water bath temperature of 45°C, and the reaction solution is evaporated under reduced pressure until no liquid is produced to obtain surfactant II.

[0018] Furthermore, the preparation method of the modified dispersant comprises the following steps: C1. Under a nitrogen atmosphere, sodium lignin sulfonate, potassium persulfate, deionized water and methyl allyl polyoxyethylene ether are placed in a three-necked flask, heated to 50-75°C, kept warm for 3-4 hours, and post-treated to obtain a modified dispersant precursor; The synthetic reaction equation of the modified dispersant precursor is:

[0019] Where: R = lignin.

[0020] The reaction synthesis principle of the modified dispersant precursor is: During the reaction, potassium persulfate decomposes to generate two sulfate free radicals, which attack the hydrogen atom on the phenolic hydroxyl group to generate a phenol free radical. The generated phenol free radical has strong reactivity and can react with the double bond in methyl allyl polyoxyethylene ether to form a new free radical intermediate. The free radical intermediate can continue to react with other olefin molecules to form a new polymer chain segment to obtain a modified dispersant precursor.

[0021] C2. Place the modified dispersant precursor, deionized water and dodecyl dimethyl benzyl ammonium chloride in a three-necked flask, heat to 35-45° C., keep warm for 0.5-1.0 h, and post-treat to obtain the modified dispersant.

[0022] The reaction synthesis principle of modified dispersant is: During the reaction, the positively charged nitrogen atom of dodecyldimethylbenzyl ammonium chloride will have an electrostatic attraction with the negatively charged sulfonic acid group in the modified dispersant precursor. This electrostatic attraction causes the two molecules to approach each other and form a mutually attractive complex.

[0023] Further, in step C1, the amount ratio of the sodium lignin sulfonate, potassium persulfate, deionized water and methyl allyl polyoxyethylene ether is 8-10g:0.4-0.6g:100-150mL:4.2-5.0g, and the post-treatment step comprises: after the reaction is completed, 200-300mL of isopropanol is added to the three-necked flask, filtered, the filter cake is washed 1-2 times with ethanol and purified water, and the filter cake is transferred to a drying oven at a temperature of 65-75°C, and vacuum dried to a constant temperature. to obtain a modified dispersant precursor; in step C2, the amount ratio of the modified dispersant precursor, deionized water and dodecyl dimethyl benzyl ammonium chloride is 1-2g:30-50mL:0.8-1.5g, and the post-treatment step comprises: after the reaction is completed, adding 150mL of ethyl acetate to a three-necked flask, washing the organic phase with deionized water for 2 times, transferring the organic phase to a rotary evaporator with a water bath temperature of 45°C, and rotary evaporating under reduced pressure until no liquid is extracted to obtain a modified dispersant.

[0024] The present invention also provides a method for preparing a water-based cleaning agent composition, which specifically comprises the following steps: placing modified surfactant I, modified surfactant II, modified dispersant, auxiliary agent and deionized water in a single-mouth bottle, mixing them evenly, standing them to remove bubbles, and obtaining the water-based cleaning agent composition.

[0025] Furthermore, the auxiliary agent is composed of a penetrant, a corrosion inhibitor, an inorganic salt and a pH adjuster in a weight ratio of 3-4:2-3:1-2:1-2, the penetrant is one or more of polyvinyl alcohol and polypropylene alcohol, the corrosion inhibitor is sodium silicate, the inorganic salt is one or more of sodium chloride and potassium chloride, and the pH adjuster is one or more of triethanolamine and monoethanolamine.

[0026] The present invention has the following beneficial effects: 1. The water-based cleaning agent composition of the present invention is prepared by using modified surfactant I and modified surfactant II as base substrates, deionized water as solvent, and modified dispersants and additives as auxiliary additives, and compounding them according to weight ratio to obtain a water-based cleaning agent composition. A modified surfactant I precursor is prepared by amidation reaction between isostearyl succinic anhydride and L-norvaline. Then, a nonionic surfactant I is synthesized by esterification reaction between the modified surfactant I precursor and 2-[2-(2-butoxyethoxy)ethoxy]ethanol. The surfactant I contains a hydrophilic group composed of a nonionic group and a lipophilic group composed of a long alkane chain. When cleaning oil stains on the surface of aluminum metal, the penetrant promotes the long alkyl chain of the surfactant I to insert into the oil phase, and the nonionic group enters the water phase, thereby reducing the surface tension of the two phases, dissolving the oil stains in water, and emulsifying to form small oil droplets. Under the action of the modified dispersant, the oil droplets are stably and uniformly dispersed in the aqueous solution of the cleaning agent composition, thereby reducing the surface tension of the surfactant I, improving its dispersibility and emulsification properties, and further improving the oil removal performance of the water-based cleaning agent composition.

[0027] 2. The water-based cleaning agent composition of the present invention is prepared by preparing an anion-containing surfactant II, which cooperates with surfactant I to enhance the degreasing performance of the water-based cleaning agent composition on aluminum metal oil stains. Surfactant II has a smaller molecular weight than surfactant I. During the washing process, its hydrophilic carboxylate group faces outward and its hydrophobic organic silicon oxygen chain segment faces inward, and is tightly adsorbed around surfactant I to form micelles, which synergistically reduce the surface tension of the oil-water interface and improve the emulsification performance of the cleaning agent composition when cleaning oil stains. After adding inorganic salts, the cation concentration in the aqueous solution increases, which promotes the combination of more cations and anions, reduces the negative charge of surfactant II, and weakens the electrostatic repulsion between the head groups of the same negative charge, which is conducive to the formation of micelles, reduces the critical micelle concentration of surfactant II, improves the emulsification performance of the cleaning agent composition when cleaning oil stains, and avoids the re-adsorption of oil droplets and aluminum metal. At the same time, the introduced organic silicon chain segment can improve the defoaming performance of the cleaning agent composition.

[0028] 3. The water-based cleaning agent composition prepared by the present invention uses methyl allyl polyoxyethylene ether as a monomer and potassium persulfate as an initiator, and synthesizes a modified dispersant precursor by an aqueous solution polymerization method, and further electrostatically assembles and introduces dodecyl dimethyl benzyl ammonium chloride into the side chain of the modified dispersant precursor to obtain a modified dispersant modified with anions and cations. The two ends of the modified dispersant are respectively introduced with a hydrophilic polyether and a hydrophobic alkyl chain, which can better adsorb on the surface of oil droplets and dust particles, improve the suspension and dispersibility of oil droplets and dust particles in the washing liquid, and further improve the degreasing performance of the water-based cleaning agent composition for aluminum metal. At the same time, the corrosion inhibitor in the auxiliary agent can enable the water-based cleaning agent composition to form a protective film on the surface of aluminum metal during the cleaning process, which has antioxidant properties, improves the corrosion resistance and rust resistance of the water-based cleaning agent composition, and the selected auxiliary agent does not contain phosphorus and strong alkali, thereby improving the environmental protection of the water-based cleaning agent composition. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The polyetheramine used in the present invention is polyetheramine D230, selected from Jinan Weizhen Chemical Co., Ltd., with a specification of 25KG; The HATU used in the present invention is selected from Hubei Shuaiyan Ligao Biopharmaceutical Co., Ltd., with a specification of 1KG and a molecular weight of 380.24. Its full Chinese name is 2-(7-azobenzotriazole)-N,N,N',N'-tetramethyluronium hexafluorophosphate; The DIPEA used in the present invention is selected from Hubei Handafei Biotechnology Co., Ltd., with a specification of 1KG, a molecular weight of 144.26, and its full Chinese name is N,N-diisopropylethylamine; Example 1 This embodiment provides a water-based cleaning agent composition and a preparation method thereof, comprising the following steps: S1. Preparation of modified surfactant I Weigh: 32 g of isostearyl succinic anhydride, 13 g of L-norvaline, 1.4 g of 4-dimethylaminopyridine and 500 mL of acetone, place in a three-necked flask protected by a nitrogen atmosphere, heat to 40°C, and keep warm for 2 hours. After the reaction is completed, add 300 mL of ethyl acetate and 300 mL of deionized water to the three-necked flask, wash the organic phase with deionized water twice, transfer the organic phase to a rotary evaporator with a water bath temperature of 45°C, and evaporate under reduced pressure until no liquid is extracted to obtain a modified surfactant I precursor; Weigh: 20 g of modified surfactant I precursor, 22 g of 2-[2-(2-butoxyethoxy)ethoxy]ethanol, 41 g of HATU, 28 g of DIPEA and 500 mL of dichloromethane in a three-necked flask and react at room temperature for 5 h. After the reaction is completed, the three-necked flask is heated to 50°C and distilled under reduced pressure until no liquid is extracted to obtain modified surfactant I.

[0031] S2. Preparation of modified surfactant II Weigh: 47 mL of trimethylsilyl chloride and 25 mL of isopropanol were placed in a three-necked flask, heated to 45°C, and kept warm for 0.5 h. Then, 10 mL of vinyltrimethoxysilane and 10 mL of deionized water were added, and kept warm for 2 h. After the reaction was completed, the reaction solution was cooled to room temperature, and then transferred to a separatory funnel, washed twice with deionized water, and the organic phase was transferred to a rotary evaporator with a water bath temperature of 40°C, and evaporated under reduced pressure until no liquid was extracted to obtain intermediate I. Weigh: 32 g of intermediate I, 10 g of mercaptopropionic acid, 0.5 g of benzoin dimethyl ether and 300 mL of tetrahydrofuran, place in a three-necked flask, heat to 40°C, irradiate under ultraviolet light and stir for 15 min. After the reaction is completed, transfer the reaction liquid to a rotary evaporator with a water bath temperature of 40°C, evaporate under reduced pressure until no liquid is produced, wash with petroleum ether twice and dry, to obtain intermediate II; Weigh: 10 g of intermediate II and 150 mL of methanol are placed in a three-necked flask, add 1.5 mol / L sodium hydroxide solution, adjust the pH to 8, raise the temperature to 45°C, transfer the reaction solution to a rotary evaporator with a water bath temperature of 45°C, and evaporate under reduced pressure until no liquid is extracted to obtain surfactant II.

[0032] S3. Preparation of modified dispersant Weigh: 80g of sodium lignin sulfonate, 4g of potassium persulfate, 1L of deionized water and 42g of methyl allyl polyoxyethylene ether, place in a three-necked flask protected by a nitrogen atmosphere, heat to 50°C, and keep warm for 3h. After the reaction is completed, add 2L of isopropanol to the three-necked flask, filter, wash the filter cake with ethanol and purified water twice, and drain, transfer the filter cake to a drying oven at a temperature of 65°C, and vacuum dry to constant weight to obtain a modified dispersant precursor; Weigh: 10 g of modified dispersant precursor, 300 mL of deionized water and 8 g of dodecyldimethylbenzyl ammonium chloride, put them in a three-necked flask, heat to 35°C, and keep warm for 0.5 h. After the reaction is completed, add 150 mL of ethyl acetate to the three-necked flask, wash the organic phase with deionized water twice, transfer the organic phase to a rotary evaporator with a water bath temperature of 45°C, and evaporate under reduced pressure until no liquid is extracted to obtain a modified dispersant.

[0033] S4. Preparation of water-based cleaning agent composition Weigh: 30 g of polyvinyl alcohol, 20 g of sodium silicate, 10 g of sodium chloride and 10 g of triethanolamine, mix well to obtain an auxiliary agent, and set aside; Weigh by weight: 20 parts of modified surfactant I, 20 parts of modified surfactant II, 5 parts of modified dispersant, 15 parts of auxiliary agent and 40 parts of deionized water in a single-mouth bottle, mix well, let stand to remove bubbles, and obtain a water-based cleaning agent composition.

[0034] Example 2 This embodiment provides a water-based cleaning agent composition and a preparation method thereof, comprising the following steps: S1. Preparation of modified surfactant I Weigh: 40 g of isostearyl succinic anhydride, 16 g of L-norvaline, 1.7 g of 4-dimethylaminopyridine and 650 mL of acetone, place in a three-necked flask protected by a nitrogen atmosphere, heat to 50°C, and keep warm for 2.5 hours. After the reaction is completed, add 350 mL of ethyl acetate and 350 mL of deionized water to the three-necked flask, wash the organic phase with deionized water twice, transfer the organic phase to a rotary evaporator with a water bath temperature of 45°C, and evaporate under reduced pressure until no liquid is extracted to obtain a modified surfactant I precursor; Weigh: 35 g of modified surfactant I precursor, 35 g of 2-[2-(2-butoxyethoxy)ethoxy]ethanol, 65 g of HATU, 30 g of DIPEA and 750 mL of dichloromethane in a three-necked flask and react at room temperature for 5.5 h. After the reaction is completed, the three-necked flask is heated to 55°C and distilled under reduced pressure until no liquid is extracted to obtain modified surfactant I.

[0035] S2. Preparation of modified surfactant II Weigh: 65 mL of trimethylsilyl chloride and 37 mL of isopropanol were placed in a three-necked flask, heated to 50°C, and kept warm for 0.5 h. Then, 15 mL of vinyltrimethoxysilane and 15 mL of deionized water were added, and kept warm for 2.5 h. After the reaction was completed, the reaction solution was cooled to room temperature, and then transferred to a separatory funnel, washed twice with deionized water, and the organic phase was transferred to a rotary evaporator with a water bath temperature of 40°C, and evaporated under reduced pressure until no liquid was extracted to obtain intermediate I. Weigh: 36 g of intermediate I, 12 g of mercaptopropionic acid, 0.7 g of benzoin dimethyl ether and 400 mL of tetrahydrofuran, place in a three-necked flask, heat to 45°C, irradiate and stir under ultraviolet light for 20 min. After the reaction is completed, transfer the reaction liquid to a rotary evaporator with a water bath temperature of 40°C, evaporate under reduced pressure until no liquid is produced, wash with petroleum ether twice and dry, to obtain intermediate II; Weigh: 15 g of intermediate II and 200 mL of methanol are placed in a three-necked flask, 1.5 mol / L sodium hydroxide solution is added, the pH is adjusted to 8.5, the temperature is raised to 50°C, the reaction solution is transferred to a rotary evaporator with a water bath temperature of 45°C, and the reduced pressure rotary evaporation is performed until no liquid is extracted to obtain surfactant II.

[0036] S3. Preparation of modified dispersant Weigh: 90g of sodium lignin sulfonate, 5g of potassium persulfate, 1.2L of deionized water and 46g of methyl allyl polyoxyethylene ether, place in a three-necked flask protected by a nitrogen atmosphere, heat to 65°C, and keep warm for 4h. After the reaction is completed, add 2.5L of isopropanol to the three-necked flask, filter, wash the filter cake with ethanol and purified water twice, and drain, transfer the filter cake to a drying oven at a temperature of 70°C, and vacuum dry to constant weight to obtain a modified dispersant precursor; Weigh: 15 g of modified dispersant precursor, 400 mL of deionized water and 12 g of dodecyldimethylbenzyl ammonium chloride, put them in a three-necked flask, heat to 40°C, and keep warm for 0.5 h. After the reaction is completed, add 200 mL of ethyl acetate to the three-necked flask, wash the organic phase with deionized water twice, transfer the organic phase to a rotary evaporator with a water bath temperature of 45°C, and evaporate under reduced pressure until no liquid is extracted to obtain a modified dispersant.

[0037] S4. Preparation of water-based cleaning agent composition Weigh: 35 g of polyvinyl alcohol, 25 g of sodium silicate, 15 g of sodium chloride and 15 g of triethanolamine, mix well to obtain an auxiliary agent, and set aside; Weigh by weight: 25 parts of modified surfactant I, 25 parts of modified surfactant II, 6 parts of modified dispersant, 16 parts of auxiliary agent and 50 parts of deionized water into a single-mouth bottle, mix well, let stand to remove bubbles, and obtain a water-based cleaning agent composition.

[0038] Example 3 This embodiment provides a water-based cleaning agent composition and a preparation method thereof, comprising the following steps: S1. Preparation of modified surfactant I Weigh: 50 g of isostearyl succinic anhydride, 20 g of L-norvaline, 2 g of 4-dimethylaminopyridine and 800 mL of acetone, place in a three-necked flask protected by a nitrogen atmosphere, heat to 55°C, and keep warm for 3 hours. After the reaction is completed, add 400 mL of ethyl acetate and 400 mL of deionized water to the three-necked flask, wash the organic phase with deionized water twice, transfer the organic phase to a rotary evaporator with a water bath temperature of 45°C, and evaporate under reduced pressure until no liquid is extracted to obtain a modified surfactant I precursor; Weigh: 50 g of modified surfactant I precursor, 51 g of 2-[2-(2-butoxyethoxy)ethoxy]ethanol, 4.1-9.5 g of HATU, 32 g of DIPEA and 1 L of dichloromethane into a three-necked flask and react at room temperature for 6 h. After the reaction is completed, the three-necked flask is heated to 60°C and distilled under reduced pressure until no liquid is extracted to obtain modified surfactant I.

[0039] S2. Preparation of modified surfactant II Weigh: 90 mL of trimethylsilyl chloride and 50 mL of isopropanol are placed in a three-necked flask, heated to 55°C, and kept warm for 1 hour. Add 20 mL of vinyltrimethoxysilane and 20 mL of deionized water, and keep warm for 3 hours. After the reaction is completed, wait for the reaction to cool to room temperature, transfer the reaction solution to a separatory funnel, wash twice with deionized water, transfer the organic phase to a rotary evaporator with a water bath temperature of 40°C, and evaporate under reduced pressure until no liquid is extracted to obtain intermediate I; Weigh: 40 g of intermediate I, 15 g of mercaptopropionic acid, 1 g of benzoin dimethyl ether and 500 mL of tetrahydrofuran, place in a three-necked flask, heat to 50°C, irradiate and stir under ultraviolet light for 25 min. After the reaction is completed, transfer the reaction liquid to a rotary evaporator with a water bath temperature of 40°C, evaporate under reduced pressure until no liquid is produced, wash with petroleum ether twice and dry, to obtain intermediate II; Weigh: 20 g of intermediate II and 300 mL of methanol are placed in a three-necked flask, 2 mol / L sodium hydroxide solution is added, the pH is adjusted to 9, the temperature is raised to 55°C, the reaction liquid is transferred to a rotary evaporator with a water bath temperature of 45°C, and the reduced pressure rotary evaporation is performed until no liquid is extracted to obtain surfactant II.

[0040] S3. Preparation of modified dispersant Weigh: 100 g of sodium lignin sulfonate, 6 g of potassium persulfate, 1.5 L of deionized water and 50 g of methyl allyl polyoxyethylene ether, place in a three-necked flask protected by a nitrogen atmosphere, heat to 75°C, and keep warm for 4 hours. After the reaction is completed, add 3 L of isopropanol to the three-necked flask, filter, wash the filter cake with ethanol and purified water twice, and drain it. Transfer the filter cake to a drying oven at a temperature of 75°C, and vacuum dry it to constant weight to obtain a modified dispersant precursor; Weigh: 20 g of modified dispersant precursor, 500 mL of deionized water and 15 g of dodecyldimethylbenzyl ammonium chloride, put them in a three-necked flask, heat to 45°C, and keep warm for reaction for 1.0 h. After the reaction is completed, add 150 mL of ethyl acetate to the three-necked flask, wash the organic phase with deionized water twice, transfer the organic phase to a rotary evaporator with a water bath temperature of 45°C, and evaporate under reduced pressure until no liquid is extracted to obtain a modified dispersant.

[0041] S4. Preparation of water-based cleaning agent composition Weigh: 40 g of polyvinyl alcohol, 30 g of sodium silicate, 20 g of sodium chloride and 20 g of triethanolamine, mix well to obtain an auxiliary agent, and set aside; Weigh by weight: 30 parts of modified surfactant I, 30 parts of modified surfactant II, 7 parts of modified dispersant, 20 parts of auxiliary agent and 65 parts of deionized water in a single-mouth bottle, mix well, let stand to remove bubbles, and obtain a water-based cleaning agent composition.

[0042] Comparative Example 1 The difference between this comparative example and Example 3 is that no modified surfactant I is added in step S4.

[0043] Comparative Example 2 The difference between this comparative example and Example 3 is that no modified surfactant II is added in step S4.

[0044] Comparative Example 3 The difference between this comparative example and Example 3 is that no modified dispersant is added in step S4.

[0045] Comparative Example 4 The difference between this comparative example and Example 3 is that polyvinyl alcohol is used instead of the auxiliary agent in step S4.

[0046] Performance Test: The degreasing rate and defoaming property of the water-based cleaning agent compositions prepared in Examples 1-3 and Comparative Examples 1-3 were measured with reference to the standard JB / T 4323-2019 "Water-based Metal Cleaners"; With reference to the standard QB / T 2117-1995 "Universal water-based metal cleaning agent", the corrosiveness and rust resistance of the water-based cleaning agent compositions prepared in Examples 1-3 and Comparative Examples 1-3 were tested. Specific data are shown in Table 1 - Performance test data table of each sample.

[0047] Table 1-Performance test data of each sample

[0048] Data Analysis: Comparative analysis of the data in Table 1 above shows that the water-based cleaning agent composition prepared by the present invention has a degreasing rate of 99.5%, a defoaming performance of ≤5, a tensile strength of 34.1 MPa, a corrosion amount of 1.2 mg, and a rust resistance of level 1, and all data are better than those of the comparative example; Data description: The invention is to prepare a modified surfactant I precursor by an amidation reaction between isostearyl succinic anhydride and L-norvaline, and then to synthesize a nonionic surfactant I by an esterification reaction between the modified surfactant I precursor and 2-[2-(2-butoxyethoxy)ethoxy]ethanol, and to coordinate the modified surfactant I with a surfactant II containing an organic silicon segment and a carboxylate to improve the degreasing performance and defoaming performance of a water-based cleaning agent composition, and to synthesize a modified dispersant precursor by an aqueous solution polymerization method using methyl allyl polyoxyethylene ether as a monomer and potassium persulfate as an initiator, and further electrostatic assembly; Dodecyl dimethyl benzyl ammonium chloride is introduced into the side chain of the modified dispersant precursor to obtain a modified dispersant modified with anions and cations. The hydrophilic polyether and the hydrophobic alkyl chain are introduced into the two ends of the modified dispersant respectively, so that the modified dispersant can be better adsorbed on the surface of oil droplets and dust particles, thereby improving the suspension and dispersion of oil droplets and dust particles in the washing liquid, and further improving the degreasing performance of the water-based cleaning agent composition on aluminum metal. The corrosion inhibitor in the auxiliary agent can enable the water-based cleaning agent composition to form a protective film on the surface of aluminum metal during the cleaning process, which has antioxidant properties and improves the corrosion resistance and rust resistance of the water-based cleaning agent composition. In addition, the selected auxiliary agent does not contain phosphorus and strong alkali, thereby improving the environmental protection of the water-based cleaning agent composition.

[0049] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A water-based cleaning composition, characterized in that: The invention comprises the following components in parts by weight: 20-30 parts of modified surfactant I, 20-30 parts of modified surfactant II, 5-7 parts of modified dispersant, 15-20 parts of auxiliary agent and 40-65 parts of deionized water; The preparation method of the modified surfactant I comprises the following steps: A1. In a nitrogen atmosphere, isostearyl succinic anhydride, L-norvaline, 4-dimethylaminopyridine and acetone were placed in a three-necked flask, heated to 40-55°C, kept warm for 2-3 hours, and post-treated to obtain a modified surfactant I precursor; A2. Place the modified surfactant I precursor, 2-[2-(2-butoxyethoxy)ethoxy]ethanol, HATU, DIPEA and dichloromethane in a three-necked flask, react at room temperature for 5-6 hours, and post-treat to obtain the modified surfactant I.

2. A water-based cleaning agent composition according to claim 1, characterized in that: In step A1, the amount ratio of isostearyl succinic anhydride, L-norvaline, 4-dimethylaminopyridine and acetone is 3.2-5g:1.3-2g:0.14-0.2g:50-80mL; in step A2, the amount ratio of the modified surfactant I precursor, 2-[2-(2-butoxyethoxy)ethoxy]ethanol, HATU, DIPEA and dichloromethane is 2-5g:2.2-5.1g:4.1-9.5g:2.8-3.2g:50-100mL.

3. The water-based cleaning agent composition according to claim 1, characterized in that: The preparation method of the modified surfactant II comprises the following steps: B1. Place trimethylsilyl chloride and isopropanol in a three-necked flask, heat to 45-55°C, keep warm for 0.5-1h, add vinyltrimethoxysilane and deionized water, keep warm for 2-3h, and post-treat to obtain intermediate I; B2. Place intermediate I, mercaptopropionic acid, benzoin dimethyl ether and tetrahydrofuran in a three-necked flask, heat to 40-50°C, irradiate under ultraviolet light and stir for 15-25 minutes, and post-treat to obtain intermediate II; B3. Place intermediate II and methanol in a three-necked flask, add sodium hydroxide solution, adjust the pH to 8-9, raise the temperature to 45-55°C, and post-treat to obtain surfactant II.

4. A water-based cleaning agent composition according to claim 3, characterized in that: In step B1, the volume ratio of vinyltrimethoxysilane, trimethylchlorosilane, isopropanol and deionized water is 1-2:4.7-9.0:2.5-5:1-2; in step B2, the amount ratio of intermediate I, mercaptopropionic acid, benzoin dimethyl ether and tetrahydrofuran is 3.2-4g:1-1.5g:0.05-0.1g:30-50mL; in step B3, the concentration of the sodium hydroxide solution is 1.5-2mol / L, and the amount ratio of the intermediate II and methanol is 1-2g:15-30mL.

5. The water-based cleaning composition according to claim 1, characterized in that: The preparation method of the modified dispersant comprises the following steps: C1. Under a nitrogen atmosphere, sodium lignin sulfonate, potassium persulfate, deionized water and methyl allyl polyoxyethylene ether are placed in a three-necked flask, heated to 50-75°C, kept warm for 3-4 hours, and post-treated to obtain a modified dispersant precursor; C2. Place the modified dispersant precursor, deionized water and dodecyl dimethyl benzyl ammonium chloride in a three-necked flask, heat to 35-45° C., keep warm for 0.5-1.0 h, and post-treat to obtain the modified dispersant.

6. A water-based cleaning agent composition according to claim 5, characterized in that: In step C1, the amount ratio of the sodium lignin sulfonate, potassium persulfate, deionized water and methyl allyl polyoxyethylene ether is 8-10g:0.4-0.6g:100-150mL:4.2-5.0g; in step C2, the amount ratio of the modified dispersant precursor, deionized water and dodecyl dimethyl benzyl ammonium chloride is 1-2g:30-50mL:0.8-1.5g.

7. A method for preparing the water-based cleaning agent composition according to any one of claims 1 to 6, characterized in that: The preparation method of the water-based cleaning agent composition is as follows: adding modified surfactant I, modified surfactant II, modified dispersant, auxiliary agent and deionized water into a single-mouth bottle, mixing evenly, standing to remove bubbles, and obtaining the water-based cleaning agent composition.

8. The method for preparing a water-based cleaning agent composition according to claim 7, characterized in that: The auxiliary agent is composed of a penetrant, a corrosion inhibitor, an inorganic salt and a pH regulator in a weight ratio of 3-4:2-3:1-2:1-2, the penetrant is one or more of polyvinyl alcohol and polypropylene alcohol, the corrosion inhibitor is one or more of sodium silicate and sodium metasilicate, the inorganic salt is one or more of sodium chloride and potassium chloride, and the pH regulator is one or more of triethanolamine and monoethanolamine.

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