A cleaning agent for removing putty from die-cast aluminum and a method for preparing the same

Abstract

The application discloses a kind of die-casting aluminum putty cleaning agent and preparation method thereof, and cleaning agent is composed of aminosulfonic acid, citric acid, carboxyethylthiosuccinic acid, thiourea derivative, imidazoline, gemini cationic surfactant DF-65, fatty alcohol polyoxyethylene ether mixture, C13-isomer alcohol ether T1308, long-chain fatty alcohol polyoxyethylene ether LMEO-18, polyvinylpyrrolidone PVP, diethylene glycol ethyl ether and water.The application utilizes the sulfur-containing group of carboxyethylthiosuccinic acid, has the structure similar to carbon disulfide, polarity is similar to branched long-chain alkane, has good phase solubility to die-casting aluminum surface release agent, can well emulsify surface long-chain alkane, is helpful to oil stain emulsification and dispersion, and simultaneously utilizes the interaction between high molecular polymer and surfactant, increases the viscoelasticity of oil-water interface film, strengthens emulsification, enhances the dispersion of metal oxide, realizes the rapid cleaning of die-casting aluminum surface putty.

Description

Technical Field

[0001] This invention relates to the field of cleaning agents for die-cast aluminum, specifically to a degreasing and cleaning agent for die-cast aluminum and its preparation method. Background Technology

[0002] With the continuous development of industry, die-cast aluminum products have been widely used in many fields such as automobiles, aerospace, electronics, and machinery. Die-cast aluminum has the advantages of light weight, high strength, and good machinability, making it the preferred material for many key components. However, in the die-casting process, release agents are usually used to facilitate the demolding of castings. After these release agents remain on the surface of die-cast aluminum products, they will form putty and other dirt, which not only affects the appearance quality of the product, but may also have adverse effects on subsequent processing and use. Therefore, developing an efficient cleaning agent to remove putty and release agents from the surface of die-cast aluminum is of great practical significance.

[0003] In the past, commonly used cleaning agents for die-cast aluminum mainly included organic solvent-based and strong alkaline cleaning agents. Although organic solvent-based cleaning agents have good cleaning effects, they have problems such as being flammable and explosive, highly toxic, and environmentally unfriendly. Strong alkaline cleaning agents require high temperatures and long cleaning times during the cleaning process, which can easily cause corrosion to the surface of die-cast aluminum and also generate a large amount of wastewater, putting great pressure on the environment. With increasingly stringent environmental regulations and the continuous improvement of people's environmental awareness, traditional cleaning agents are increasingly unable to meet market demands. Therefore, we propose a degreasing and sludge cleaning agent for die-cast aluminum. Summary of the Invention

[0004] The purpose of this invention is to provide a degreasing and cleaning agent for die-cast aluminum and its preparation method, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a degreasing and cleaning agent for die-cast aluminum, wherein the cleaning agent is composed of aminosulfonic acid, citric acid, carboxyethyl thiosuccinic acid, thiourea derivative, imidazoline, gemini cationic surfactant DF-65, a mixture of fatty alcohol polyoxyethylene ethers, C13-isomeric alcohol ether T1308, long-chain fatty alcohol polyoxyethylene ether LMEO-18, polyvinylpyrrolidone PVP, diethylene glycol ethyl ether, and water, with the following percentages: aminosulfonic acid 3-8.0%; citric acid 1-5.0%; carboxyethyl thiosuccinic acid 0.5-3.0%; thiourea derivative 0.5-2.0%; imidazoline 0.5-5.0%; gemini cationic surfactant DF-65 0.5-5.0%; fatty alcohol polyoxyethylene ether mixture 10-20.0%; C13-isomeric alcohol ether T1308 5-10.0%; long-chain fatty alcohol polyoxyethylene ether LMEO-18. 0.5-4.0%; polyvinylpyrrolidone (PVP) 0.5-2.0%; diethylene glycol ethyl ether 1.0-3.0%; water balance.

[0006] A method for preparing a degreasing and cleaning agent for die-cast aluminum includes the following steps: A. Add aminosulfonic acid, citric acid, carboxyethyl thiosuccinic acid, thiourea derivative and imidazoline to a portion of water in sequence and dissolve them. Stir thoroughly at 20-30℃ for 10 minutes until completely dissolved to obtain solution A. B. Take a small amount of water and mix the following ingredients in sequence: Gemini cationic surfactant DF-65, fatty alcohol polyoxyethylene ether mixture, C13-isomeric alcohol ether T1308, long-chain fatty acid polyoxyethylene ether LMEO-18, diethylene glycol ethyl ether and polyvinylpyrrolidone PVP. Stir until homogeneous and record as solution B. C. While continuously stirring solution B, slowly add solution A to solution B, continue stirring for 10 minutes, add the remaining water, and continue stirring for 20 minutes to obtain a pale yellow transparent solution. D. After the well-stirred solution has stood for 10 minutes without separating into layers and passes the test, it is then dispensed into containers.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes the sulfur-containing group of carboxyethyl thiosuccinic acid, which has a structure similar to carbon disulfide and polarity similar to branched long-chain alkanes. It has good compatibility with mold release agents on die-cast aluminum surfaces and can effectively emulsify long-chain alkanes on the surface, which is very helpful for emulsifying and dispersing oil stains. At the same time, it also utilizes the interaction between polymer and surfactant to increase the viscoelasticity of the oil-water interface film, enhance emulsification, and improve the dispersion of metal oxides, thereby achieving rapid cleaning of putty from die-cast aluminum surfaces and providing a clean and impurity-free surface for subsequent passivation treatment. Detailed Implementation

[0008] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0009] A degreasing and cleaning agent for die-cast aluminum, comprising aminosulfonic acid, citric acid, carboxyethyl thiosuccinic acid, thiourea derivative, imidazoline, gemini cationic surfactant DF-65, a mixture of fatty alcohol polyoxyethylene ethers, C13-isomeric alcohol ether T1308, long-chain fatty alcohol polyoxyethylene ether LMEO-18, polyvinylpyrrolidone (PVP), diethylene glycol ethyl ether, and water, with the following percentages: aminosulfonic acid 8.0%; citric acid 1.0%; carboxyethyl thiosuccinic acid 0.5%; thiourea derivative 1.0%; imidazoline 5.5%; gemini cationic surfactant DF-65 2.0%; fatty alcohol polyoxyethylene ether mixture 15%; C13-isomeric alcohol ether T1308 6.0%; long-chain fatty alcohol polyoxyethylene ether LMEO-18 2.0%; polyvinylpyrrolidone (PVP) 0.5%; diethylene glycol ethyl ether 3.0%; and water 55.5%.

[0010] A method for preparing a degreasing and cleaning agent for die-cast aluminum includes the following steps: A. Add aminosulfonic acid, citric acid, carboxyethyl thiosuccinic acid, thiourea derivative and imidazoline to a portion of water in sequence and dissolve. Stir thoroughly at 20°C for 10 minutes until completely dissolved to obtain solution A. B. Take a small amount of water and mix the following ingredients in sequence: Gemini cationic surfactant DF-65, fatty alcohol polyoxyethylene ether mixture, C13-isomeric alcohol ether T1308, long-chain fatty acid polyoxyethylene ether LMEO-18, diethylene glycol ethyl ether and polyvinylpyrrolidone PVP. Stir until homogeneous and record as solution B. C. While continuously stirring solution B, slowly add solution A to solution B, continue stirring for 10 minutes, add the remaining water, and continue stirring for 20 minutes to obtain a pale yellow transparent solution. D. After the well-stirred solution has stood for 10 minutes without separating into layers and passes the test, it is then dispensed into containers. Example 2:

[0011] A degreasing and cleaning agent for die-cast aluminum, comprising aminosulfonic acid, citric acid, carboxyethyl thiosuccinic acid, thiourea derivative, imidazoline, gemini cationic surfactant DF-65, a mixture of fatty alcohol polyoxyethylene ethers, C13-isomeric alcohol ether T1308, long-chain fatty alcohol polyoxyethylene ether LMEO-18, polyvinylpyrrolidone (PVP), diethylene glycol ethyl ether, and water, with the following percentages: aminosulfonic acid 3.0%; citric acid 8.0%; carboxyethyl thiosuccinic acid 3.0%; thiourea derivative 1.5%; imidazoline 3.5%; gemini cationic surfactant DF-65 4.0%; fatty alcohol polyoxyethylene ether mixture 10.0%; C13-isomeric alcohol ether T1308 5.0%; long-chain fatty alcohol polyoxyethylene ether LMEO-18 1.0%; polyvinylpyrrolidone (PVP) 2.0%; diethylene glycol ethyl ether 5.0%; and water 56%.

[0012] A method for preparing a degreasing and cleaning agent for die-cast aluminum includes the following steps: A. Add aminosulfonic acid, citric acid, carboxyethyl thiosuccinic acid, thiourea derivative and imidazoline to a portion of water in sequence and dissolve them. Stir thoroughly at 30°C for 10 minutes until completely dissolved to obtain solution A. B. Take a small amount of water and mix the following ingredients in sequence: Gemini cationic surfactant DF-65, fatty alcohol polyoxyethylene ether mixture, C13-isomeric alcohol ether T1308, long-chain fatty acid polyoxyethylene ether LMEO-18, diethylene glycol ethyl ether and polyvinylpyrrolidone PVP. Stir until homogeneous and record as solution B. C. While continuously stirring solution B, slowly add solution A to solution B, continue stirring for 10 minutes, add the remaining water, and continue stirring for 20 minutes to obtain a pale yellow transparent solution. D. After the well-stirred solution has stood for 10 minutes without separating into layers and passes the test, it is then dispensed into containers.

[0013] Aluminum alloys do not corrode in environments without fluoride ions or with low concentrations of nitric acid. However, die-cast aluminum, due to the presence of copper-containing metallic compounds on its surface, is prone to corrosion and blackening in acidic environments. This patent uses common aminosulfonic acid and citric acid as the main pickling raw materials, with carboxyethyl thiosuccinic acid as an auxiliary agent. Urea or thiourea derivatives and imidazoline-type amphoteric surfactants are used as corrosion inhibitors. Carboxyethyl thiosuccinic acid has a thio group, polarity similar to alkane chains, and excellent emulsification properties for oil stains. It also has good dispersibility for metal ions in water and is very effective in cleaning and dispersing oil stains. In industrial production, die-cast aluminum requires cleaning after two stages: first, the cutting emulsion after deburring and direct machining, and second, the surface release agent. The first step is cleaning, which involves removing burrs and cleaning the surface after shot blasting or sandblasting to strengthen the surface structure and remove the layer of putty adhering to it. The acidic cleaning solution provided in this patent has a pH value close to the isoelectric point of the oxide layer and the attached metal oxide particles on the aluminum alloy surface, making it easy to detach from the surface. This patent utilizes the synergistic effect between surfactants and polymers to enhance the emulsification and dispersibility of oil and particles. Polyvinylpyrrolidone is a water-soluble polymer with high solubility. Its unique pyrrole ring can form complexes with metal ions, thus having a strong dispersing effect on metal oxides. Literature shows that polymers and surfactants can form polymer chain molecular brushes or micelle pearl necklaces embedded in the polymer backbone, which have a good dispersing effect on emulsified oil particles. This avoids the oil from floating on the surface of the cleaning liquid after being peeled off from the metal surface during the degreasing process. If it is not overflowed and removed in time, it can easily cause secondary pollution during the workpiece rinsing process.

[0014] Organic carboxylic acids have the following significant environmental advantages: Low toxicity: Compared with organic solvents and strong alkaline substances, organic carboxylic acids have lower toxicity and pose less harm to human health and the environment. During use, they do not produce toxic or harmful gases or wastewater, thus meeting environmental protection requirements. Biodegradability: Many organic carboxylic acids have good biodegradability and can be decomposed into harmless substances by microorganisms in the natural environment. This means that the cleaning agent will not cause long-term pollution to the environment after use, which is beneficial to the protection of the ecological environment. Low-temperature cleaning performance: The cleaning agent of this invention can effectively clean putty and release agent on the surface of die-cast aluminum at a lower temperature. Compared with traditional strong alkaline cleaning agents, low-temperature cleaning can reduce energy consumption and production costs, while also avoiding corrosion and damage to the surface of die-cast aluminum caused by high temperature. Highly efficient cleaning effect: Organic carboxylic acids can chemically react with putty and release agents on the surface of die-cast aluminum, decomposing them into substances that are easy to clean. At the same time, other auxiliary ingredients such as surfactants and corrosion inhibitors are added to the cleaning agent, which further improves the cleaning effect and the protection of die-cast aluminum.

[0015] With increasingly stringent environmental protection requirements and the expanding market for die-cast aluminum products, the demand for efficient and environmentally friendly die-cast aluminum cleaning agents is becoming increasingly urgent. The organic carboxylic acid cleaning agent of this invention has advantages such as low toxicity, good biodegradability, superior low-temperature cleaning performance, and high-efficiency cleaning effect, which can meet market demands. This cleaning agent can not only be used in the production process of die-cast aluminum products, but also in the fields of repair, maintenance, and reprocessing of die-cast aluminum products, and has broad market application prospects. It can promote the sustainable development of the die-cast aluminum industry. Using organic carboxylic acid as the main component, it has significant environmental advantages and good cleaning effect.

[0016] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A degreasing and cleaning agent for die-cast aluminum, characterized in that: The cleaning agent is composed of aminosulfonic acid, citric acid, carboxyethyl thiosuccinic acid, thiourea derivative, imidazoline, gemini cationic surfactant DF-65, a mixture of fatty alcohol polyoxyethylene ethers, C13-isomeric alcohol ether T1308, long-chain fatty alcohol polyoxyethylene ether LMEO-18, polyvinylpyrrolidone (PVP), diethylene glycol ethyl ether, and water. The percentages of the ingredients are as follows: aminosulfonic acid 3-8.0%; citric acid 1-5.0%; carboxyethyl thiosuccinic acid 0.5-3.0%; thiourea derivative 0.5-2.0%; imidazoline 0.5-5.0%; gemini cationic surfactant DF-65 0.5-5.0%; fatty alcohol polyoxyethylene ether mixture 10-20.0%; C13-isomeric alcohol ether T1308 5-10.0%; long-chain fatty alcohol polyoxyethylene ether LMEO-18 0.5-4.0%; polyvinylpyrrolidone (PVP). 0.5-2.0%; diethylene glycol ethyl ether 1.0-3.0%; water balance.

2. A method for preparing a degreasing and cleaning agent for die-cast aluminum, characterized in that: Includes the following steps: A. Add aminosulfonic acid, citric acid, carboxyethyl thiosuccinic acid, thiourea derivative and imidazoline to a portion of water in sequence and dissolve them. Stir thoroughly at 20-30℃ for 10 minutes until completely dissolved to obtain solution A. B. Take a small amount of water and mix the following ingredients in sequence: Gemini cationic surfactant DF-65, fatty alcohol polyoxyethylene ether mixture, C13-isomeric alcohol ether T1308, long-chain fatty acid polyoxyethylene ether LMEO-18, diethylene glycol ethyl ether and polyvinylpyrrolidone PVP. Stir until homogeneous and record as solution B. C. While continuously stirring solution B, slowly add solution A to solution B, continue stirring for 10 minutes, add the remaining water, and continue stirring for 20 minutes to obtain a pale yellow transparent solution. D. After the well-stirred solution has stood for 10 minutes without separating into layers and passes the test, it is then dispensed into containers.