Water-based latex paint cleaning agent as well as preparation method and application thereof

Abstract

The invention discloses a water-based latex paint cleaning agent as well as a preparation method and application thereof. The water-based latex paint cleaning agent provided by the invention comprises the following components in percentage by weight: 5wt%-10wt% of an ester solvent, 10wt%-15wt% of an alcohol ether solvent, 5wt%-10wt% of fatty acid, 1wt%-5wt% of organic alkali and 65wt%-77wt% of water, and the pH value of the latex paint cleaning agent is 6-8. The water-based emulsion paint cleaning agent provided by the invention is a neutral solution system, is safe, environment-friendly and low in corrosivity, and has strong cleaning power. The ester solvent and the alcohol ether solvent can soften and open cross-linked bonds of the cured latex paint, and the emulsifier generated by the reaction of the fatty acid and the organic alkali can emulsify the ester solvent, reduce the surface tension and improve the permeability. According to the preparation method of the water-based latex paint cleaning agent, the solvent with good dissolving power is uniformly and stably distributed in water, and the cleaning and infiltration capacity of the product is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fine chemicals and relates to a water-based latex paint cleaner and a preparation method and application thereof. Background Art

[0002] Latex paint, also known as synthetic resin emulsion paint, is a type of water-based paint made from a synthetic resin emulsion, supplemented with pigments, fillers, and various additives. It is a type of organic paint. Depending on the raw materials used, latex paints primarily include polyvinyl acetate latex paint, ethylene propylene latex paint, and pure acrylic latex paint. Latex paint is widely used in environmentally friendly residential construction due to its rapid film formation, shortened construction time, cost savings, excellent breathability, environmental friendliness, odorlessness, and washability.

[0003] Latex paint is widely used as a common wall decoration material during renovations. However, during construction and daily use, latex paint often leaves residue on tiles, door frames, railings, furniture surfaces, stoves, sinks, floors, and other surfaces. Removing this residual latex paint is not only time-consuming and labor-intensive, but also difficult to completely remove. This has led to an increasing demand for latex paint cleaners, especially high-quality ones.

[0004] Currently, latex paint cleaners can be categorized into the following types. The first type is acidic latex paint cleaners. These products are typically packaged in hand-spray bottles and can be used to remove residual latex paint from various surfaces with a simple spray and wipe. They offer the advantages of ease of use and strong cleaning power. This is because acidity corrodes latex paint. The hydrogen ions in the acidic solution react chemically with the paint's components, changing its physical and chemical properties and causing it to decompose or deteriorate, making it easier to remove. However, acidic latex paint cleaners, because they use strong inorganic or monobasic organic acids, have a pungent odor when atomized through a spray nozzle, which can easily irritate the nasal mucosa. Even with a mask, this acidic odor cannot be eliminated. Furthermore, these acidic cleaners are ineffective for removing residual latex paint from metal surfaces due to their low pH, and residual cleaner can cause corrosion and rust. The second type is solvent-based latex paint cleaners. These cleaners contain various highly polar organic solvents. Based on the principle of like dissolves like, these organic solvents not only remove latex paint but may also remove substances on the substrate. Examples include paint on furniture, metal frames of doors and windows, wood floors, and handrails. These household surfaces are highly sensitive to organic solvents, and in severe cases, may even cause deformation. A third option is highly alkaline latex paint cleaners, such as hand-wash water. However, this highly alkaline hand-wash water is not only corrosive to the substrate but also to human skin, and it also has a pungent odor. Most importantly, hand-wash water is flammable, posing a safety hazard. A fourth option is neutral water-based latex paint cleaners. These products are typically made with deionized water, an activator, and a penetrant. While they are environmentally friendly and have a low odor, current neutral water-based latex paint cleaners have limited cleaning power and often require tools such as stiff brushes and spatulas to remove the paint. Summary of the Invention

[0005] Based on this, it is necessary to provide a water-based latex paint cleaner with strong cleaning power, low corrosiveness and high safety, as well as a preparation method and application thereof.

[0006] In some embodiments, a water-based latex paint cleaner is provided, which comprises, by weight percentage, 5 wt% to 10 wt% of an ester solvent, 10 wt% to 15 wt% of an alcohol ether solvent, 5 wt% to 10 wt% of a fatty acid, 1 wt% to 5 wt% of an organic base, and 65 wt% to 77 wt% of water, wherein the pH value of the water-based latex paint cleaner is 6 to 8.

[0007] In some embodiments, the provided water-based latex paint cleaner comprises, by weight percentage, 7 wt% to 9 wt% of an ester solvent, 12 wt% to 13 wt% of an alcohol ether solvent, 5 wt% to 7 wt% of a fatty acid having 16 to 20 carbon atoms, 1.2 wt% to 3.5 wt% of an organic base, and 66 wt% to 77 wt% of water.

[0008] In some embodiments, in the provided water-based latex paint cleaner, the flash points of the ester solvent and the alcohol ether solvent are greater than or equal to 60°C.

[0009] In some embodiments, in the provided water-based latex paint cleaner, the ester solvent comprises one or more of ethyl acetate, butyl acetate, n-propyl acetate, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol ethyl ether acetate, and diethylene glycol butyl ether acetate;

[0010] The alcohol ether solvent includes one or more of ethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol butyl ether and diethylene glycol butyl ether.

[0011] In some embodiments, in the provided water-based latex paint cleaner, the organic base comprises one or more of ethanolamine, diethanolamine, and triethanolamine.

[0012] In some embodiments, the provided water-based latex paint cleaner is an oil-in-water microemulsion.

[0013] In some embodiments, a water-based latex paint cleaner is provided that satisfies one or more of the following characteristics:

[0014] (1) The water-based latex paint cleaner further contains 0.05wt% to 0.5wt% of a preservative;

[0015] (2) The water-based latex paint cleaner does not contain strong acids or strong bases; and

[0016] (3) The water-based latex paint cleaner is at least one of an aerosol, a pump spray and a brush liquid.

[0017] In some embodiments, a method for preparing a water-based latex paint cleaner is provided, comprising the following steps: mixing an aqueous solution and an oily solution, adjusting the pH to 6 to 8 with an organic base, and dispersing the mixed system until it becomes transparent to prepare a water-based latex paint cleaner;

[0018] The water-based latex paint cleaner comprises 5wt%-10wt% of ester solvent, 10wt%-15wt% of alcohol ether solvent, 5wt%-10wt% of fatty acid, 1wt%-5wt% of organic base and 65wt%-77wt% of water.

[0019] In some embodiments, the water-based latex paint cleaner is prepared by a method comprising the following steps:

[0020] (1) the water-based latex paint cleaner comprises 7wt%-9wt% of ester solvent, 12wt%-13wt% of alcohol ether solvent, 5wt%-7wt% of fatty acid with 16-20 carbon atoms, 1.2wt%-3.5wt% of organic base and 66wt%-77wt% of water;

[0021] (2) the flash point of the ester solvent and the alcohol ether solvent is greater than or equal to 60℃;

[0022] (3) the ester solvent comprises one or more of ethyl acetate, butyl acetate, n-propyl acetate, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol ethyl ether acetate and diethylene glycol butyl ether acetate;

[0023] (4) the alcohol ether solvent comprises one or more of ethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol butyl ether and diethylene glycol butyl ether;

[0024] (5) the organic base comprises one or more of ethanolamine, diethanolamine and triethanolamine;

[0025] (6) the preparation method further comprises adding a preservative to the aqueous solution, and the mass percentage of the preservative in the water-based latex paint cleaner is 0.05%-0.5%;

[0026] (7) the preparation method of the water-based latex paint cleaner does not use strong acid and strong base;

[0027] (8) in the mixing step of the aqueous solution and the oily solution, the mixing is performed under stirring at 30rpm-122rpm for 15min-60min;

[0028] (9) in the dispersion step of the mixed system, the stirring is performed under stirring at 30rpm-122rpm for 15min-60min;

[0029] (10) the water-based latex paint cleaner is an oil-in-water microemulsion; and

[0030] (11) The water-based latex paint cleaner is at least one of an aerosol, a pump spray, and a brush liquid.

[0031] In some embodiments, there is provided a use of at least one of the water-based latex paint cleaner and the water-based latex paint cleaner prepared by the preparation method in removing latex paint.

[0032] The aforementioned water-based latex paint cleaner is a neutral solution system that is safe, environmentally friendly, low in corrosiveness, and possesses strong cleaning power. Ester solvents and alcohol ether solvents can soften and break the cross-linking bonds of solidified latex paint, while the emulsifier generated by the reaction of fatty acids and organic bases can emulsify the ester solvent, reducing surface tension and improving penetration performance. The preparation method of the provided water-based latex paint cleaner evenly and stably distributes the solvent with good solvency in water, enhancing the product's cleaning and penetration capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments and examples of this application and to provide a more complete understanding of the application and its beneficial effects, the following briefly introduces the drawings required for use in the description of the embodiments or examples. Obviously, the drawings described below are only some embodiments of this application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0034] Figure 1 The graph is a graph showing the stability test results of the microemulsion of the latex paint cleaner obtained in Example 2, wherein A represents the state of the latex paint cleaner on the 0th day after being placed in a 50°C environment, and B represents the state of the latex paint cleaner on the 30th day after being placed in a 50°C environment;

[0035] Figure 2 The cleaning power test results of the latex paint cleaner obtained in Example 2 are shown in Figure A, where A is a floor surface not treated with the latex paint cleaner, and B is a floor surface sprayed with the latex paint cleaner and wiped four times;

[0036] Figure 3 The surface of the residual latex paint was not treated with the latex paint cleaner obtained in Example 2;

[0037] Figure 4 The latex paint cleaning agent liquid obtained in Example 2 was sprayed on the surface of the residual latex paint and left there for 1 minute;

[0038] Figure 5 After spraying the latex paint cleaner obtained in Example 2, wipe the surface back and forth three times with a towel;

[0039] Figure 6The results of the corrosion test of the latex paint cleaner prepared in Example 2 sprayed on an aluminum alloy door frame, where A is the state of the aluminum alloy door frame before the test and B is the state of the aluminum alloy door frame after the test;

[0040] Figure 7 The results of the corrosion test of the latex paint cleaner prepared in Example 2 sprayed on the surface of ceramic tiles, where A is the state of the ceramic tiles before the test and B is the state of the ceramic tiles after the test;

[0041] Figure 8 The results of the corrosion test of the latex paint cleaner prepared in Example 2 sprayed on a wooden paint surface, where A is the state of the wooden paint surface before the test and B is the state of the wooden paint surface after the test;

[0042] Figure 9 The results of the corrosion test of the latex paint cleaner prepared in Example 2 sprayed on the surface of a metal material, wherein A is the surface state of the metal material before the test, and B is the surface state of the metal material after the test. DETAILED DESCRIPTION

[0043] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0045] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0046] In this application, "plurality", "multiple", "multiple times", "multiples", etc., unless otherwise specified, refer to a quantity greater than or equal to 2. For example, "one or more" means one or more than or equal to two.

[0047] The terms "combination thereof", "any combination thereof", "any combination thereof" and the like used in this application include all suitable combinations of any two or more of the listed items.

[0048] In this application, the "suitable" mentioned in "suitable combination", "suitable method", "any suitable method", etc. is based on the ability to implement the technical solution of this application, solve the technical problems of this application, and achieve the expected technical effects of this application.

[0049] In this application, "preferred", "better", "more preferred" and "suitable" are only used to describe implementation methods or examples with better effects. It should be understood that they do not constitute a limitation on the scope of protection of this application.

[0050] In this application, "further", "further", "particularly" and the like are used for descriptive purposes to indicate differences in content, but should not be understood as limiting the scope of protection of this application.

[0051] In this application, the terms "optionally," "optional," and "optional" mean optional or dispensable, i.e., they refer to either option being selected from two parallel options: "with" or "without." If a technical solution contains multiple "optional" clauses, each "optional" clause is independent unless otherwise specified and there are no contradictions or constraints.

[0052] In the present invention, in the "first aspect," "second aspect," "third aspect," "fourth aspect," etc., the terms "first," "second," "third," "fourth," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, "first," "second," "third," "fourth," etc. serve only as non-exhaustive enumeration and description and should be understood not to constitute a closed-ended limitation on quantity.

[0053] In this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0054] In this application, when referring to a numerical interval (i.e., a numerical range), unless otherwise specified, the optional numerical distribution is considered continuous within the above numerical interval and includes the two numerical endpoints of the numerical range (i.e., the minimum and maximum values), as well as each numerical value between the two numerical endpoints. Unless otherwise specified, when a numerical interval refers only to integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints. In this article, it is equivalent to directly listing each integer, such as t is an integer selected from 1 to 10, indicating that t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be merged. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges included therein.

[0055] Unless otherwise specified, the temperature parameters in this application allow for both constant temperature treatment and temperature fluctuations within a certain temperature range. It should be understood that the constant temperature treatment allows for temperature fluctuations within the accuracy range of instrument control. Fluctuations within ranges such as ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are permitted.

[0056] In this application, % (w / w) and wt% both refer to weight percentage, % (v / v) refers to volume percentage, and % (w / v) refers to mass volume percentage.

[0057] In this application, "strong acid" refers to a reagent such as hydrochloric acid, sulfuric acid, nitric acid, and perchloric acid that can completely ionize to produce hydrogen ions.

[0058] In this application, "strong base" refers to a reagent such as sodium hydroxide, potassium hydroxide, quaternary ammonium base, etc. that can completely ionize to produce hydroxide ions.

[0059] The "room temperature" in this application generally refers to 5°C to 30°C, preferably 25±5°C.

[0060] Latex paint is a synthetic resin emulsion coating. The curing process can be broadly divided into three stages: physical curing, chemical curing, and polycondensation. In the first stage of physical curing, water in the latex paint evaporates, resulting in the concentration of polymer particles. This creates a dense, dense coating. In the second stage, chemical curing, chemical reactions lead to crosslinking between polymer chains, hardening the paint film. This stage is also called the "drying" stage because the surface of the paint has dried, but the internal chemical curing process continues. The final stage, polycondensation, is where the polymer chains react again and further cure, resulting in crosslinking to form a harder coating. Cleaning latex paint with water takes a long time because water has a high surface tension and poor permeability. Furthermore, the hydroxyl groups in water are less reactive, which lessens the effect on the cured crosslinks and prevents them from expanding.

[0061] The water-based latex paint cleaners we offer are environmentally friendly, highly safe, and offer strong cleaning power and low corrosiveness, combining ease of use with high cost-effectiveness. They are non-flammable or non-combustible, with a flash point greater than 60°C, ensuring safety. They contain no toxic or harmful substances, or any volatile substances that are toxic or harmful to humans, making them environmentally friendly. They utilize solvents based on the principle of like dissolves like, resulting in strong cleaning power. The solvents contain water and specific active groups, are free of highly polar solvents, strong acids, or strong bases, and exhibit low corrosiveness.

[0062] In order to provide a water-based latex paint cleaner with strong cleaning power, low corrosion and high safety, and combine the concept of safety and environmental protection, the formula provided in the present application takes into account the following elements: first, a relatively low surface tension to accelerate the penetration and softening of the solution to the latex paint; second, the presence of specific solvents, the selected ester solvents and alcohol ether solvents contain specific active groups, such as fatty ethers, carboxylic acid esters, and diol end groups, which can easily soften and open the cross-linking bonds of the cured latex paint, and these solvents are not easily volatile; these active groups are not too active, which can reduce irritation and corrosion; from the safety point of view, the flash point of the solvent used is greater than or equal to 60℃, which is safe. Third, the latex paint cleaner is a neutral solution system, which is safe, environmentally friendly, and low in corrosion.

[0063] In some embodiments, a water-based latex paint cleaner is provided, which comprises, in percentage by weight, 5wt%-10wt% of ester solvents, 10wt%-15wt% of alcohol ether solvents, 5wt%-10wt% of organic acids, 1wt%-5wt% of organic bases, and 65wt%-77wt% of water, and the pH value of the water-based latex paint cleaner is 6-8.

[0064] In some embodiments, the water-based latex paint cleaner provided comprises, in percentage by weight, 7wt%-9wt% of ester solvents, 12wt%-13wt% of alcohol ether solvents, 5wt%-7wt% of fatty acids with 16-20 carbon atoms, 1.2wt%-3.5wt% of organic bases, and 66wt%-77wt% of water.

[0065] During the research, the inventors used alcohol solvents, alkane solvents, alcohol ether solvents, ketone solvents, ester solvents, aromatic hydrocarbon solvents, etc. to dissolve latex paint, tested the solubility of the solvents to latex paint, and determined the flash point, volatility and odor irritation of various solvents. The alcohol solvents can include but are not limited to one or more of methanol, ethanol, isopropyl alcohol, benzyl alcohol, etc. The alkane solvents can include but are not limited to one or more of D20 solvent oil, D80 solvent oil, n-heptane, petroleum ether, etc. The alcohol ether solvents can include but are not limited to one or more of ethylene glycol methyl ether, diethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol butyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, etc. The ketone solvents can include but are not limited to one or more of acetone, butanone, cyclohexanone, etc. The ester solvents can include but are not limited to one or more of ethyl acetate, butyl acetate, n-propyl acetate, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, etc. The aromatic hydrocarbon solvents can include but are not limited to one or more of toluene, xylene, mesitylene, mesitylene, etc.

[0066] After research, benzyl alcohol, ethylene glycol methyl ether, diethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol butyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, ethyl acetate, butyl acetate, n-propyl acetate, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, toluene, dimethylbenzene, mesitylene, durene and other solvents can all dissolve latex paint quickly, can be used for preparing latex paint cleaning agent. However, benzyl alcohol and durene have a certain degree of toxicity, and the group polarity such as benzyloxy and phenyl ring is too strong simultaneously, and has strong corrosiveness, should not be used to prepare latex paint cleaning agent. Diethylene glycol methyl ether and ethylene glycol butyl ether are because of reproductive toxicity, should not be used to prepare latex paint cleaning agent.

[0067] In some embodiments, the flash point of the ester solvent and the alcohol ether solvent is greater than or equal to 60° C. In some embodiments, the ester solvent comprises one or more of ethyl acetate, butyl acetate, n-propyl acetate, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol ethyl ether acetate, and diethylene glycol butyl ether acetate.

[0068] Because ester solvents are not easily soluble in water, they need to be emulsified into water. Furthermore, these solvents may hydrolyze in strongly acidic or alkaline conditions. Therefore, microemulsification is necessary, and the emulsified solution must be neutral.

[0069] The type and content of the emulsifier determine the degree of microemulsification. In some embodiments, acetate esters, which are particularly difficult to emulsify, are microemulsified using the reaction product of a fatty acid and an organic base as an emulsifier to emulsify the ester solvent. The selected emulsifier has a low HLB value and is hydrophilic. Based on the principle of like dissolves like, it effectively emulsifies acetate esters. The selection of a specific organic base can reduce the surface tension of the feed solution.

[0070] In some embodiments, the organic base comprises one or more of ethanolamine, diethanolamine, and triethanolamine.

[0071] The added organic base reacts with the organic acid to make the pH of the obtained latex paint cleaner neutral, which is more environmentally friendly. At the same time, an emulsifier is generated to further reduce the surface tension and improve the penetration performance. The generated emulsifier further emulsifies the ester solvent to form a microemulsion.

[0072] This emulsification method is more effective than directly adding an emulsifier, such as a nonionic surfactant. Emulsifying acetate solvents requires a physical process, and without the use of a high-energy homogenizer, it is difficult to achieve very small micelle clusters. It is well known that larger micelle clusters result in a less stable emulsified state, while smaller micelle clusters result in a more stable emulsified state. The emulsification process of combining oleic acid and an organic base combines both chemical reaction and physical emulsification, resulting in even smaller micelle clusters without the need for complex mechanical dispersion and stirring.

[0073] The inventors have found that regardless of how the ratio of oleic acid to organic base is adjusted, even if a well-emulsified solution is initially obtained, it is difficult to maintain a stable microemulsion over time or after high-temperature testing, such as at 50°C. In the latex paint cleaner provided in this application, the alcohol ether solvent can serve as a cosolvent to enhance the emulsification effect, allowing the water-based latex paint cleaner to reach a microemulsion state.

[0074] In some embodiments, the alcohol ether solvent comprises one or more of ethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol butyl ether, and diethylene glycol butyl ether.

[0075] In some embodiments, the water-based latex paint cleaner is an oil-in-water microemulsion.

[0076] In some embodiments, the water-based latex paint cleaner further comprises 0.05 wt % to 0.5 wt % of a preservative.

[0077] In some embodiments, the preservative comprises one or more of kasone and kalanchoe.

[0078] In some embodiments, strong acids and strong bases are absent.

[0079] In some embodiments, the water-based latex paint cleaner is at least one of an aerosol, a pump spray, and a brush-on liquid.

[0080] In some embodiments, a method for preparing a water-based latex paint cleaner is provided, comprising the following steps:

[0081] An aqueous solution and an oily solution are mixed, the pH value is adjusted to 6-8 by using an organic base, and the mixed system is dispersed until it becomes transparent to prepare a water-based latex paint cleaner.

[0082] The aqueous solution contains water and an alcohol ether solvent, and the oily solution contains fatty acids and ester solvents. In terms of weight percentage, the water-based latex paint cleaner contains 5wt%~10wt% of ester solvents, 10wt%~15wt% of alcohol ether solvents, 5wt%~10wt% of fatty acids, 1wt%~5wt% of organic bases and 65wt%~77wt% of water.

[0083] In some embodiments, in the preparation method of the provided water-based latex paint cleaner, the water-based latex paint cleaner comprises, by weight percentage, 7 wt% to 9 wt% of an ester solvent, 12 wt% to 13 wt% of an alcohol ether solvent, 5 wt% to 7 wt% of a fatty acid having 16 to 20 carbon atoms, 1.2 wt% to 3.5 wt% of an organic base, and 66 wt% to 77 wt% of water.

[0084] In some embodiments, in the method for preparing a water-based latex paint cleaner provided, the flash points of the ester solvent and the alcohol ether solvent are greater than or equal to 60°C.

[0085] In some embodiments, in the preparation method of the provided water-based latex paint cleaner, the ester solvent comprises one or more of ethyl acetate, butyl acetate, n-propyl acetate, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol ethyl ether acetate, and diethylene glycol butyl ether acetate.

[0086] In some embodiments, in the provided method for preparing a water-based latex paint cleaner, the alcohol ether solvent comprises one or more of ethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol butyl ether, and diethylene glycol butyl ether.

[0087] In some embodiments, in the provided method for preparing a water-based latex paint cleaner, the organic base comprises one or more of ethanolamine, diethanolamine, and triethanolamine.

[0088] In some embodiments, the method for preparing a water-based latex paint cleaner provided further comprises adding a preservative to the aqueous solution, wherein the mass percentage of the preservative in the latex paint cleaner is 0.05% to 0.5%.

[0089] In some embodiments, in the provided method for preparing a water-based latex paint cleaner, strong acids and strong bases are not used in the steps of the method for preparing the water-based latex paint cleaner.

[0090] In some embodiments, in the method for preparing a water-based latex paint cleaner provided, in the step of mixing the aqueous solution and the oily solution, the mixing is carried out by stirring at 30 rpm to 122 rpm for 15 min to 60 min.

[0091] In some embodiments, in the method for preparing a water-based latex paint cleaner provided, the mixed system is subjected to a dispersion step and stirred at 30 rpm to 122 rpm for 15 min to 60 min.

[0092] In some embodiments, in the method for preparing a water-based latex paint cleaner provided, the latex paint cleaner is an oil-in-water microemulsion.

[0093] In some embodiments, in the method for preparing a water-based latex paint cleaner provided, the latex paint cleaner is at least one of an aerosol, a pump spray, and a brush-on liquid.

[0094] In some embodiments, in the method for preparing a water-based latex paint cleaner, in the step of uniformly mixing the oily solution and the aqueous solution, the mixture is stirred at 30 rpm to 122 rpm for 15 min to 60 min.

[0095] In some embodiments, in the preparation method of the water-based latex paint cleaner, after adding the organic base, stirring is carried out at 30 rpm to 122 rpm for 15 min to 60 min.

[0096] In some embodiments, there is provided a use of the aforementioned water-based latex paint cleaner or the water-based latex paint cleaner prepared by the aforementioned preparation method in removing latex paint.

[0097] The water-based latex paint cleaner provided by the company is highly safe, environmentally friendly, has strong cleaning power, is low in corrosiveness, is easy to use, and is highly economical. It does not require any strong acids or bases, maintaining a neutral pH of 6-8, while also solving the problem of quickly removing residual latex paint. The latex paint cleaner utilizes appropriate solvents, emulsifiers, and cosolvents to ensure strong cleaning power while reducing the corrosiveness of the liquid and enhancing product safety. It is easy to operate, offers strong cleaning power, is environmentally friendly and safe, and offers a high cost-effectiveness, making it highly practical.

[0098] In order to make the purpose and advantages of the present invention clearer, the scheme of the present invention and its effect are further described in detail below in conjunction with specific examples. It should be understood that the specific examples described herein are only used to explain the present invention and shall not be used to limit the present invention. The following examples do not include other components except inevitable impurities unless otherwise specified. The drugs and instruments used in the examples are conventionally selected in the art unless otherwise specified. The experimental methods for which specific conditions are not specified in the examples are implemented according to conventional conditions, such as the conditions described in the literature, books, or the methods recommended by the manufacturer.

[0099] Example 1 Screening of solvents

[0100] The dissolving power of alcohol solvents, alkane solvents, alcohol ether solvents, ketone solvents, ester solvents, aromatic hydrocarbon solvents, etc. on latex paint is tested, and the flash point, volatility and odor irritation of various solvents are measured at the same time. The test method is as follows.

[0101] Dissolving power: evenly spread the emulsion paint on a tinplate with the size of 10 cm in length and 1 cm in width, hang and dry naturally. After completely dried, immerse into a glass bottle containing 100 ml solvent. Every 5 min, observe the dissolution of the emulsion paint surface and record, after observation, shake the glass bottle 10 times to let the liquid impact the emulsion paint coating, and then stand still. If the coating dissolves or falls off within 5 min, it is fast dissolution. If the coating dissolves or falls off within 10-20 min, it is dissolution. If the coating dissolves or falls off more than 20 min, it is slow dissolution.

[0102] Flash point: the method of GB / T 261 is used for detection.

[0103] Volatile: take 1 ml liquid with a dropper, drop on the metal, and wipe with non-woven fabric. If the liquid volatilizes within 1 min, it is easy to volatilize.

[0104] Odor irritability: smell with nose.

[0105] The detection results can be referred to Table 1 below.

[0106] Table 1: preliminary selection of solvents

[0107]

[0108] Table 1: continued

[0109]

[0110] From the data in Table 1, it can be seen that benzyl alcohol, ethylene glycol methyl ether, diethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol butyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, ethyl acetate, butyl acetate, n-propyl acetate, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, toluene, xylene, mesitylene, mesitylene, etc. solvents can quickly dissolve the emulsion paint. However, benzyl alcohol and mesitylene have certain degree of toxicity, and the polarity of benzyloxy and benzene ring groups is too strong, and they have strong corrosivity, which are not suitable for preparing emulsion paint cleaner. Diethylene glycol methyl ether and ethylene glycol butyl ether are not suitable for preparing emulsion paint cleaner due to reproductive toxicity.

[0111] Preparation of emulsion paint cleaner in Example 2-Example 8

[0112] 1. Formulation composition

[0113] The formulation composition of Example 2-Example 8 is shown in Table 2.

[0114] Table 2

[0115]

[0116] In each embodiment and comparative example in Table 2, the content of each component is a percentage of the total weight of the latex paint cleaner.

[0117] Comparative Example 3

[0118] Similar to Example 2, except that 7.5 wt % of triethanolamine monooleate is used instead of 5 wt % of oleic acid and 2.5 wt % of triethanolamine in Example 2.

[0119] Comparative Example 4

[0120] Similar to Example 2, except that 7.5 wt % of diethylene glycol butyl ether acetate in Example 2 is replaced by 7.5 wt % of D80 solvent oil.

[0121] Comparative Example 5

[0122] Similar to Example 2, except that 12.5 wt % of D80 solvent oil is used instead of 12.5 wt % of propylene glycol butyl ether in Example 2.

[0123] 2. Preparation process

[0124] The raw materials used in Examples 2 to 8 shown in Table 2 were respectively taken to prepare latex paint cleaners according to the following method:

[0125] Stir deionized water, preservative, and alcohol ether solvent to form an aqueous solution;

[0126] Add fatty acid and ester solvent and stir thoroughly to form an oily solution;

[0127] The oily solvent was added to the aqueous solution, and the mixture was stirred at 100 rpm for 20 minutes to form a mixed solution. An organic base was then added and the mixture was stirred at 100 rpm for 20 minutes to make the liquid transparent, thereby obtaining a latex paint cleaner.

[0128] Performance Testing

[0129] 1. Microemulsion stability test

[0130] The latex paint cleaners obtained in the examples and comparative examples were placed in a 50° C. environment for 30 days to observe whether the liquid was clear.

[0131] The results are as follows Figure 1 As shown, A is the state of the latex paint cleaner of Example 2 placed in a 50°C environment on the 0th day, and B is the state of the latex paint cleaner of Example 2 placed in a 50°C environment on the 30th day. Figure 1It can be seen that the latex paint cleaner of Example 2 remains transparent and stable without stratification after being placed in a 50° C. environment for 30 days.

[0132] The latex paint cleaning agent liquid obtained in Example 2 was centrifuged at 2500 rpm for 30 min to observe whether the liquid was separated into layers. After testing, the latex paint cleaning agent liquid obtained in Example 2 was not separated into layers or turbid after centrifugation and was in a stable state.

[0133] The latex paint cleaner of Comparative Example 1 was placed in a 50° C. environment and allowed to stand for 1 hour, and obvious stratification occurred.

[0134] The latex paint cleaner of Comparative Example 3 was placed in a 50° C. environment and allowed to stand for 7 days, at which point stratification occurred.

[0135] 2. Determination of cleaning power for rapid removal of latex paint:

[0136] The latex paint cleaner solution obtained in the examples and comparative examples was sprayed on the latex paint residue and left for 1 minute, then wiped and evaluated. The evaluation criteria were as follows:

[0137] (1) Wipe back and forth with a towel no more than 5 times to immediately remove the residual latex paint, which can be rated as excellent.

[0138] (2) Wipe back and forth with a towel no more than 10 times to remove the residual latex paint, which can be rated as good.

[0139] (3) The residual latex paint can be removed by wiping back and forth with a towel no more than 15 times, which can be rated as medium.

[0140] (4) Use a towel to wipe back and forth no more than 20 times to remove the residual latex paint, which can be rated as poor.

[0141] The results are as follows Figure 2 and Figures 3 to 5 As shown. Among them, Figure 2 A in the middle is the floor surface that has not been treated with latex paint cleaner. Figure 2 B is the floor surface that was sprayed with the latex paint cleaner of Example 2 and then wiped four times. Figure 3 For the surface of untreated residual latex paint, Figure 4 The latex paint cleaning agent liquid of Example 2 was sprayed on the residual latex paint surface and stayed there for 1 minute. Figure 5 After spraying the latex paint cleaner of Example 2, wipe the surface back and forth 3 times with a towel. Figure 2 It can be seen from the figure that the latex paint cleaner of Example 2 can remove the residual latex paint by wiping back and forth 4 times with a towel, and the cleaning power is excellent. Figures 3 to 5 It can be seen that the latex paint cleaner of Example 2 can remove the residual latex paint by wiping back and forth with a towel three times, and the cleaning power is excellent.

[0142] The cleaning power of the latex paint cleaner of Comparative Example 2 was evaluated as medium.

[0143] The cleaning power of the latex paint cleaner of Comparative Example 4 was evaluated as medium.

[0144] The cleaning power of the latex paint cleaner of Comparative Example 5 was evaluated as medium.

[0145] 3. Liquid pH and flash point detection

[0146] The pH value of the latex paint cleaner prepared in the example was measured using the method in GB / T 4472. The flash point of the latex paint cleaner prepared in the example was measured using the method in GB / T 261.

[0147] After testing, the latex paint cleaner prepared in the embodiment has a neutral pH value and a flash point greater than 60° C., and is safe and environmentally friendly.

[0148] 4. Judgment of corrosiveness:

[0149] The latex paint cleaner prepared in the example was sprayed on the following surfaces for corrosion testing:

[0150] (1) Spray on the paint surface of the aluminum alloy door frame for 15 minutes to see if there are any bubbling, fading, softening, or damage on the paint surface.

[0151] (2) Spray on the tiles for 15 minutes and check whether there are bubbles, dissolution, or damage on the tiles.

[0152] (3) Spray on the wooden paint surface for 15 minutes to see if there are any bubbling, discoloration, softening, or damage on the paint surface.

[0153] (4) Spray on the metal surface for 15 minutes to see if there are any bubbling, discoloration, softening, or damage.

[0154] The results are as follows Figures 6 to 9 ,in, Figure 6 A in the figure is the state of the aluminum alloy door frame before the test. Figure 6 B in the figure is the state of the aluminum alloy door frame after being tested with the latex paint cleaner of Example 2. Figure 7 A in the figure is the tile state before the test. Figure 7 B in the figure is the state of the tile after being tested with the latex paint cleaner of Example 2. Figure 8 A in the figure is the state of the wood paint surface before the test. Figure 8 B in the figure is the state of the wood paint surface after being tested with the latex paint cleaner of Example 2. Figure 9 A in the figure is the surface condition of the metal material before the test. Figure 9 B in the figure is the surface condition of the metal material after being tested with the latex paint cleaner of Example 2. Figures 6 to 9The test results show that the latex paint cleaner provided is non-corrosive.

[0155] 5. Technical indicators are shown in Table 3 below.

[0156] Table 3

[0157]

[0158] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0159] The above-described embodiments merely represent several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be based on the appended claims, and the description and drawings shall be used to interpret the content of the claims.

Claims

1. A water-based latex paint cleaner, characterized in that: Calculated by weight percentage, the water-based latex paint cleaner comprises 5wt%-10wt% of an ester solvent, 10wt%-15wt% of an alcohol ether solvent, 5wt%-10wt% of a fatty acid, 1wt%-5wt% of an organic base, and 65wt%-77wt% of water. The pH value of the water-based latex paint cleaner is 6-8.

2. The water-based latex paint cleaner according to claim 1, characterized in that Calculated by weight, the composition comprises 7wt% to 9wt% of an ester solvent, 12wt% to 13wt% of an alcohol ether solvent, 5wt% to 7wt% of a fatty acid having 16 to 20 carbon atoms, 1.2wt% to 3.5wt% of an organic base, and 66wt% to 77wt% of water.

3. The water-based latex paint cleaner according to claim 1 or 2, characterized in that: The flash points of the ester solvent and the alcohol ether solvent are greater than or equal to 60°C.

4. The water-based latex paint cleaner according to any one of claims 1 to 3, characterized in that The ester solvent comprises one or more of ethyl acetate, butyl acetate, n-propyl acetate, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol ethyl ether acetate and diethylene glycol butyl ether acetate; The alcohol ether solvent includes one or more of ethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol butyl ether and diethylene glycol butyl ether.

5. The water-based latex paint cleaner according to any one of claims 1 to 4, characterized in that: The organic base comprises one or more of ethanolamine, diethanolamine and triethanolamine.

6. The water-based latex paint cleaner according to any one of claims 1 to 5, characterized in that: The water-based latex paint cleaner is an oil-in-water microemulsion.

7. The water-based latex paint cleaner according to any one of claims 1 to 6, characterized in that: Meet one or more of the following characteristics: (1) The water-based latex paint cleaner further contains 0.05wt% to 0.5wt% of a preservative; (2) The water-based latex paint cleaner does not contain strong acids or strong bases; and (3) The water-based latex paint cleaner is at least one of an aerosol, a pump spray and a brush liquid.

8. A method for preparing a water-based latex paint cleaner, characterized in that: The method comprises the following steps: mixing an aqueous solution and an oily solution, adjusting the pH to 6-8 with an organic base, and dispersing the mixed system until it becomes transparent to prepare a water-based latex paint cleaner; The aqueous solution contains water and an alcohol ether solvent, and the oily solution contains fatty acids and ester solvents. In terms of weight percentage, the water-based latex paint cleaner contains 5wt%~10wt% of ester solvents, 10wt%~15wt% of alcohol ether solvents, 5wt%~10wt% of fatty acids, 1wt%~5wt% of organic bases and 65wt%~77wt% of water.

9. The preparation method according to claim 8, characterized in that Meet one or more of the following characteristics: (1) In terms of weight percentage, the water-based latex paint cleaner comprises 7 wt% to 9 wt% of an ester solvent, 12 wt% to 13 wt% of an alcohol ether solvent, 5 wt% to 7 wt% of a fatty acid having 16 to 20 carbon atoms, 1.2 wt% to 3.5 wt% of an organic base, and 66 wt% to 77 wt% of water; (2) The flash point of the ester solvent and the alcohol ether solvent is greater than or equal to 60°C; (3) The ester solvent comprises one or more of ethyl acetate, butyl acetate, n-propyl acetate, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol ethyl ether acetate and diethylene glycol butyl ether acetate; (4) The alcohol ether solvent comprises one or more of ethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol butyl ether and diethylene glycol butyl ether; (5) The organic base comprises one or more of ethanolamine, diethanolamine and triethanolamine; (6) The preparation method further comprises adding a preservative to the aqueous solution, wherein the mass percentage of the preservative in the water-based latex paint cleaner is 0.05% to 0.5%; (7) No strong acid or strong base is used in the steps of the preparation method of the water-based latex paint cleaner; (8) In the step of mixing the aqueous solution and the oily solution, stirring at 30 rpm to 122 rpm for 15 min to 60 min to mix; (9) The mixed system was subjected to the dispersion step and stirred at 30 rpm to 122 rpm for 15 min to 60 min; (10) The water-based latex paint cleaner is an oil-in-water microemulsion; as well as (11) The water-based latex paint cleaner is at least one of an aerosol, a pump spray, and a brush liquid.

10. Use of at least one of the water-based latex paint cleaner according to any one of claims 1 to 7 and the water-based latex paint cleaner prepared by the preparation method according to claim 8 or 9 in removing latex paint.

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