A cleaning agent and a method for preparing the same

Abstract

This invention discloses a cleaning agent and its preparation method, relating to the technical field of industrial cleaning agents. The cleaning agent comprises a nonionic surfactant, an alkyl glycol ether, a metal corrosion inhibitor, EDTA, and deionized water. The nonionic surfactant includes fatty alcohol polyoxyethylene ether, and the alkoxyethanol is one of 2-butoxyethanol and 2(2-butoxyethoxy)ethanol. The metal corrosion inhibitor is one of benzotriazole or benzimidazole. Through the above method, a cleaning agent with performance close to that of the existing 141B cleaning agent can be obtained. It not only has excellent oil stain cleaning performance, but also does not contain halogen elements such as fluorine and chlorine in the raw materials used, therefore its ozone depletion potential is 0, which conforms to environmental protection trends and is conducive to promoting the development of green and environmentally friendly industrial cleaning agents.

Description

Technical Field

[0001] This invention relates to the technical field of industrial cleaning agents, and in particular to a cleaning agent and its preparation method. Background Technology

[0002] With the continuous advancement of industrial production technology, industrial cleaning agents play an indispensable and crucial role in various production, processing, casting, and manufacturing processes. Especially in industries such as metal processing and casting, where the cleanliness requirements for parts are extremely high, selecting appropriate industrial cleaning agents can not only effectively remove oil, paraffin, or impurities from the surface of castings, but also ensure product quality and performance. At the same time, the gradual increase in global environmental awareness and increasingly stringent environmental regulations are driving the industrial cleaning agent industry towards a green and environmentally friendly direction characterized by low pollution, low hazard, and biodegradability. Although existing traditional industrial cleaning agents are effective in specific cleaning scenarios, most products have inherent defects in environmental performance, making it difficult to meet the current industry's green development needs. Therefore, the development of new industrial cleaning agents that combine excellent cleaning performance with environmental characteristics has become a core trend in industry development.

[0003] For cleaning metal castings, the mainstream cleaning agents on the market are mainly chlorine-based solvents, with 141B cleaning agent being a typical example. These chlorine-based solvents, due to their unique chemical properties, can quickly dissolve various contaminants such as paraffin wax, water-based oils, cutting fluids, and milling fluids on the surface of castings, and are widely used in industrial production. In addition, some organic solvent-based cleaning agents utilize the principle of "like dissolves like" to dissolve and remove contaminants, and are also used in related fields.

[0004] However, existing mainstream chlorine-containing cleaning agents (such as 141B cleaning agent) have significant environmental shortcomings: they have a high chlorine content and a clear ozone depletion potential, which contradicts the global trend of phasing out ozone-depleting substances and promoting green and low-carbon development advocated by the Montreal Protocol and the Kigali Amendments. These environmentally unfriendly characteristics not only gradually limit their application scope but also pose a risk of being phased out. Therefore, developing a new type of industrial cleaning agent with low chlorine content, low ozone depletion potential, and compliance with environmental regulations, while ensuring the core cleaning performance of the cleaning agent, is of great practical significance for promoting the green transformation of the industrial sector and expanding the application prospects of cleaning agents. Summary of the Invention

[0005] In order to develop a new type of industrial cleaning agent with low chlorine content, low ozone depletion potential, and compliance with environmental regulations while ensuring the core cleaning performance of the cleaning agent, this application provides a cleaning agent and its preparation method.

[0006] Firstly, the cleaning agent provided in this application adopts the following technical solution: A cleaning agent comprising the following raw materials by weight percentage: Nonionic surfactant: 5%; Alkyl glycol ethers: 4-8%; Metal corrosion inhibitor: 0.4-0.9%; EDTA: 0.6-1%; The remainder is deionized water; The nonionic surfactant includes fatty alcohol polyoxyethylene ether, the alkoxyethanol is one of 2-butoxyethanol and 2(2-butoxyethoxy)ethanol, and the metal corrosion inhibitor is one of benzotriazole or benzimidazole.

[0007] By adopting the above technical solution, a cleaning agent with performance close to that of the existing 141B cleaning agent can be obtained. It not only has excellent oil stain cleaning performance, but also does not contain halogen elements such as fluorine and chlorine in the raw materials used. Therefore, the ozone depletion potential of the cleaning agent is 0, which is in line with the environmental protection trend of the Montreal Protocol and the Kigali Amendment. It can be effectively used as a substitute for 141B cleaning agent, which will help promote the development of industrial cleaning agents towards a green and environmentally friendly direction.

[0008] Optionally, the nonionic surfactant includes fatty alcohol polyoxyethylene ether, wherein the fatty alcohol polyoxyethylene ether is one or more of AEO-7, AEO-9, and Pingpingjia O-10.

[0009] Optionally, the nonionic surfactant is specifically a composition of AEO-7, AEO-9 and Pingpingjia O-10, and the mass ratio of AEO-7, AEO-9 and Pingpingjia O-10 is 1:(1.5-3):(1-2.5).

[0010] By adopting the above technical solution, the cleaning agent can have good penetration and emulsification effects, and thus can exhibit good cleaning and rinsing properties for both light and heavy oil stains.

[0011] Optionally, the alkoxyethanol is specifically 2-butoxyethanol, and the metal corrosion inhibitor is benzotriazole; The 2-butoxyethanol is 4-6% by mass, and the benzotriazole is 0.3-0.6% by mass.

[0012] By adopting the above technical solution, the cleaning agent obtained not only has a good cleaning effect, but also reduces the negative effects caused by excessive addition of some raw materials. At the same time, it can control the raw material cost of the cleaning agent, which is conducive to producing a cleaning agent that is cost-effective, environmentally friendly, and can replace the existing 141B cleaning agent.

[0013] Optionally, the nonionic surfactant further includes FMEE and alkyl glycoside, wherein the FMEE is a low-foaming E type, and the alkyl glycoside is one of decanyl glucoside or lauryl glucoside.

[0014] By adopting the above technical solution, FMEE, as a low-foaming surfactant, can significantly reduce the amount of foam generated by the cleaning agent during use. This helps prevent the decrease in cleaning efficiency and the increase in rinsing difficulty caused by excessive foam. Simultaneously, FMEE exhibits excellent emulsifying properties for heavy oil stains at medium and high temperatures, which synergistically enhances the cleaning agent's effectiveness against heavy oil stains. Furthermore, alkyl glycosides possess excellent biodegradability and mildness, further improving the environmental friendliness of the cleaning agent and reducing its irritation to metal substrates.

[0015] Optionally, the nonionic surfactant is a composition of AEO-9, Pingpingjia O-10, FMEE and lauryl glucoside, and the mass ratio of AEO-9, Pingpingjia O-10, FMEE and lauryl glucoside is 1:1.5:(1-2):(0.5-1.5).

[0016] By adopting the above technical solution, this mixing ratio helps to balance the oil stain cleaning effect of the cleaning agent with its mildness and environmental friendliness, so that the cleaning agent can achieve efficient cleaning without causing too much negative impact on the cleaned parts.

[0017] Optionally, the alkoxyethanol is specifically 2-(2-butoxyethoxy)ethanol, and the metal corrosion inhibitor is benzimidazole; The 2-(2-butoxyethoxy)ethanol has a mass percentage of 6-8%, and the benzimidazole has a mass percentage of 0.6-0.9%.

[0018] By adopting the above technical solution and combining it with a nonionic surfactant composed of fatty alcohol polyoxyethylene ether, FMEE, and alkyl glycosides, a cleaning agent with significantly better cleaning performance than the existing 141B cleaning agent can be produced, especially for cleaning heavy oil stains such as engine oil and petroleum. Although the overall cost is higher, the cleaning agent has superior comprehensive performance and is suitable for cleaning high-end, precision metal parts with heavy oil stains.

[0019] Secondly, the preparation method of the cleaning agent provided in this application adopts the following technical solution: A method for preparing a cleaning agent includes the following steps: First, nonionic surfactant and deionized water are heated and stirred together. Then, alkoxyethanol, metal corrosion inhibitor and EDTA are added. Stirring is continued until the solution is evenly dispersed. The pH value is adjusted to obtain the cleaning agent.

[0020] Optionally, the pH value of the cleaning agent needs to be adjusted to 8-9.

[0021] By adopting the above technical solution, the preparation method is simple and convenient, requiring only conventional heating and stirring equipment, which is beneficial for manufacturers to carry out large-scale production.

[0022] Thirdly, the application of the cleaning agent provided in this application adopts the following technical solution: An application of a cleaning agent for precision cleaning of cast metal parts, machined metal parts, ground and milled metal parts, and engine oil tanks.

[0023] In summary, the technical solution of this application has at least one of the following beneficial effects: 1. By mixing nonionic surfactants, alkoxyethanol, metal corrosion inhibitors, and EDTA in a certain proportion, a cleaning agent with performance close to that of existing 141B cleaning agents can be prepared. It not only has excellent oil stain cleaning performance, but also has an ozone depletion potential of 0, which is in line with the environmental trend of the Montreal Protocol and the Kigali Amendment, and is conducive to promoting the development of industrial cleaning agents towards a green and environmentally friendly direction.

[0024] 2. By introducing low-foaming FMEE and alkyl glycosides into nonionic surfactants in combination with fatty alcohol polyoxyethylene ethers, it is beneficial to balance the oil stain cleaning effect of the cleaning agent with its mildness and environmental friendliness, so that the cleaning agent can achieve efficient cleaning without causing too much negative impact on the cleaned parts.

[0025] 3. By combining fatty alcohol polyoxyethylene ether, FMEE, alkyl glycoside, 2-(2-butoxyethoxy)ethanol, benzimidazole and EDTA, a cleaning agent with excellent cleaning effect on heavy oil stains such as engine oil and petroleum can be prepared. Detailed Implementation

[0026] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0027] All fatty alcohol polyoxyethylene ethers were purchased from Jiangsu Haian Petrochemical.

[0028] FMEE (fatty acid methyl ester ethoxylate) was purchased from Xihe Chemical, specifically Texzo-E type FMEE.

[0029] The alkyl glycosides were all purchased from Guangzhou Zhonghai Chemical, specifically the decanyl glucoside of brand APG-0810 and the lauryl glucoside of brand APG-1214. Example

[0030]

Example 1

[0031] In this embodiment, the nonionic surfactant is a fatty alcohol polyoxyethylene ether, specifically a composition of AEO-7, AEO-9 and Pingpingjia O-10, wherein the mass ratio of AEO-7, AEO-9 and Pingpingjia O-10 is 1:3:1, that is, the nonionic surfactant includes 1 kg of AEO-7, 3 kg of AEO-9 and 1 kg of Pingpingjia O-10.

[0032] In this embodiment, alkoxyethanol is specifically selected as 2-butoxyethanol, and the metal corrosion inhibitor is specifically selected as benzotriazole.

[0033] A method for preparing a cleaning agent, comprising the following steps: First, heat the nonionic surfactant and deionized water to 50°C and stir to mix. Then, add alkoxyethanol, metal corrosion inhibitor and EDTA, and continue stirring until the solution is evenly dispersed. Adjust the pH value to 8.5 to obtain the cleaning agent.

[0034]

Example 2

[0035] In this embodiment, the nonionic surfactant is a fatty alcohol polyoxyethylene ether, specifically a composition of AEO-7, AEO-9 and Pingpingjia O-10, wherein the mass ratio of AEO-7, AEO-9 and Pingpingjia O-10 is 1:1.5:2.5, that is, the nonionic surfactant includes 1 kg of AEO-7, 1.5 kg of AEO-9 and 2.5 kg of Pingpingjia O-10.

[0036]

Example 3

[0037] In this embodiment, the amount of 2-butoxyethanol added is 6 kg, the amount of deionized water added is 88 kg, and the total mass of the cleaning agent is kept at 100 kg.

[0038]

Example 4

[0039] In this embodiment, the amount of 2-butoxyethanol added is 8 kg, the amount of deionized water added is 86 kg, and the total mass of the cleaning agent is kept at 100 kg.

[0040]

Example 5

[0041] In this embodiment, 2-(2-butoxyethoxy)ethanol is used to replace 2-butoxyethanol in an equal amount.

[0042]

Example 6

[0043] In this embodiment, the amount of benzotriazole added is 0.6 kg, the amount of deionized water added is 87.7 kg, and the total mass of the cleaning agent is kept at 100 kg.

[0044]

Example 7

[0045] In this embodiment, the amount of benzotriazole added is 0.9 kg, the amount of deionized water added is 87.4 kg, and the total mass of the cleaning agent is kept at 100 kg.

[0046]

Example 8

[0047] In this embodiment, benzimidazole is used to replace benzotriazole in an equal amount.

[0048]

Example 9

[0049] In this embodiment, the nonionic surfactant includes fatty alcohol polyoxyethylene ether, low-foaming E-type FMEE, and alkyl glycosides, specifically a composition of AEO-9, Pingpingjia O-10, FMEE, and decanyl glucoside. The mass ratio of AEO-9, Pingpingjia O-10, FMEE, and decanyl glucoside is 1:1.5:2:0.5, meaning the nonionic surfactant comprises 1 kg AEO-9, 1.5 kg Pingpingjia O-10, 2 kg FMEE, and 0.5 kg decanyl glucoside.

[0050] In this embodiment, alkoxyethanol is specifically 2-(2-butoxyethoxy)ethanol, and the metal corrosion inhibitor is benzimidazole.

[0051] A method for preparing a cleaning agent includes the following steps: First, heat the nonionic surfactant and deionized water to 60°C and stir to mix. Then, add alkoxyethanol, metal corrosion inhibitor and EDTA, and continue stirring until the solution is evenly dispersed. Adjust the pH value to 8.5 to obtain the cleaning agent.

[0052]

Example 10

[0053] In this embodiment, the mass ratio of AEO-9, Pingpingjia O-10, FMEE and decanyl glucoside is 1:1.5:1:1.5.

[0054]

Example 11

[0055] In this embodiment, the alkyl glycoside is specifically lauryl glucoside. Comparative Example

[0056] Comparative Example 1 A cleaning agent, specifically commercially available 141B cleaning agent. Performance testing

[0057] 1. High and low temperature cleaning rate: The cleaning power was tested according to Section 5.7 of GB / T 35759-2017 Metal Cleaning Agents. Standard-sized pure copper plates and stainless steel plates were used as test plates. Light oil and heavy oil were used as the oil stains to be cleaned. The light oil was prepared by mixing 30% cutting oil, 10% coolant, 10% grinding and milling fluid, 40% industrial petroleum jelly and 10% paraffin oil. The heavy oil was prepared according to the artificial oil stains in the standard. Then, the standard swirl washing method was used for cleaning. The cleaning was carried out at solution temperatures of 25℃ and 60℃ respectively. The cleaning rate (%) was calculated and recorded.

[0058] 2. Corrosivity: The corrosion test was conducted in accordance with Section 5.9 of GB / T 35759-2017 Metal Cleaning Agents, with stainless steel as the test plate and the test time extended to 4 hours. The corrosion amount (mg) of the corresponding test piece was calculated and recorded.

[0059] 3. Rinsing performance: The rinsing performance shall be tested in accordance with section 5.11 of GB / T 35759-2017 Metal Cleaning Agents. The surface of the test piece shall be observed by touch and visual inspection to see if there is any cleaning agent residue. If there is no obvious residue, it shall be recorded as qualified.

[0060] Table 1 Cleaning efficiency data of cleaning agents

[0061] Based on Examples 1, 9, and Comparative Example 1, and considering the data in Table 1, it can be seen that by using nonionic surfactants, alkoxyethanol, metal corrosion inhibitors, and EDTA, a cleaning agent with cleaning properties close to or even better than the existing 141B cleaning agent can be prepared. When the nonionic surfactant is only fatty alcohol polyoxyethylene ether, the addition of 2-butoxyethanol, benzotriazole, and EDTA results in a cleaning agent with a slightly lower cleaning rate for light oil stains such as cutting oil and paraffin oil, and heavy oil stains such as engine oil and petroleum, but the difference is not significant. When the nonionic surfactant is fatty alcohol polyoxyethylene ether, FMEE, and alkyl glycoside, the addition of 2-(2-butoxyethoxy)ethanol, benzimidazole, and EDTA further improves the cleaning rate of the cleaning agent, especially for heavy oil stain environments, where the cleaning rate is significantly improved under high-temperature washing. In addition, since the raw materials used do not contain chlorine, meaning that its ozone depletion potential (ODP) is 0, it conforms to the environmental trends of the Montreal Protocol and the Kigali Amendment, and can therefore serve as a substitute for existing 141B cleaning agents.

[0062] Combining Examples 1 and 2 with the data in Table 1, it can be seen that as the proportion of Pingpingjia O-10 in the nonionic surfactant increases, the cleaning agent with only added fatty alcohol polyoxyethylene ether shows a slight improvement in its cleaning ability for heavy oil stains, but has little effect on the cleaning rate of light oil stains such as cutting oil and paraffin oil, and even a decrease in the cleaning rate under low-temperature rinsing. This may be due to the excellent emulsifying power of Pingpingjia O-10 for heavy oil stains, but at the same time, the relative increase in the content of Pingpingjia O-10 will also lead to a decrease in the content of AEO-9, a decrease in penetration efficiency, and thus affect the cleaning rate of the cleaning agent at low temperatures.

[0063] Based on Examples 2-5 and the data in Table 1, it can be seen that as the content of 2-butoxyethanol further increases, the cleaning efficiency of the cleaning agent initially increases significantly and then plateaus. The increased cleaning efficiency is attributed to the dissolving power of 2-butoxyethanol, which enhances the penetration of the cleaning agent into oil stains and improves emulsification cleaning efficiency. Because 2-butoxyethanol has a strong dissolving ability for organic oil films, it may affect benzotriazole, leading to a very slight increase in corrosion. However, the increase in wear may also be due to measurement error. Furthermore, when 2-(2-butoxyethoxy)ethanol is used to replace 2-butoxyethanol in an equal amount, the overall cleaning performance is also improved, especially under high-temperature washing of heavy oil stains.

[0064] Based on Examples 3 and 6-8 and the data in Table 1, it can be seen that although the cleaning efficiency of the cleaning agent decreases slightly with the increase of benzotriazole content, the corrosion rate is reduced. Furthermore, when benzotriazole is replaced with an equal amount of benzimidazole, the cleaning efficiency of the cleaning agent also improves, and the improvement is also significant under high-temperature washing of heavy oil stains.

[0065] Based on Examples 9-11 and the data in Table 1, it can be seen that by further combining low-foaming E-type FMEE and alkyl glycosides with Examples 1-8, while maintaining the nonionic surfactant content, and adding appropriate amounts of 2-(2-butoxyethoxy)ethanol, benzimidazole, and EDTA, the resulting cleaning agent exhibits excellent cleaning performance at both low and high temperatures. It is particularly effective for cleaning heavy oil stains such as engine oil and petroleum, showing a significant improvement in heavy oil cleaning performance compared to Examples 1-8 or the existing 141B cleaning agent. Secondly, possibly because the emulsifying ability of alkyl glycosides is not as good as that of FMEE, the cleaning agent's cleaning performance decreases slightly with increasing alkyl glycoside content and decreasing FMEE content in the nonionic surfactant, but the overall cleaning performance is not significantly affected. Furthermore, when alkyl glycosides are replaced by an equal amount of lauryl glucoside, the cleaning rate for heavy oil stains significantly improves, while the cleaning rate for light oil stains is not significantly affected.

[0066] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A cleaning agent, characterized in that: Including the following percentages of raw materials by weight: Nonionic surfactant: 5-10%; Alkyl glycol ethers: 4-8%; Metal corrosion inhibitor: 0.3-0.9%; EDTA: 0.7-1%; The remainder is deionized water; The nonionic surfactant includes fatty alcohol polyoxyethylene ether, the alkoxyethanol is one of 2-butoxyethanol and 2(2-butoxyethoxy)ethanol, and the metal corrosion inhibitor is one of benzotriazole or benzimidazole.

2. The cleaning agent according to claim 1, characterized in that: The fatty alcohol polyoxyethylene ether is one or more of AEO-7, AEO-9, and Pingpingjia O-10.

3. The cleaning agent according to claim 2, characterized in that: The nonionic surfactant is specifically a composition of AEO-7, AEO-9 and Pingpingjia O-10, and the mass ratio of AEO-7, AEO-9 and Pingpingjia O-10 is 1:(1.5-3):(1-2.5).

4. The cleaning agent according to claim 3, characterized in that: The alkoxyethanol is specifically 2-butoxyethanol, and the metal corrosion inhibitor is benzotriazole; The 2-butoxyethanol is 4-6% by mass, and the benzotriazole is 0.3-0.6% by mass.

5. The cleaning agent according to claim 2, characterized in that: The nonionic surfactant also includes FMEE and alkyl glycoside, wherein the FMEE is a low-foaming E type, and the alkyl glycoside is one of decanyl glucoside or lauryl glucoside.

6. The cleaning agent according to claim 5, characterized in that: The nonionic surfactant is a composition of AEO-9, Pingpingjia O-10, FMEE and lauryl glucoside, and the mass ratio of AEO-9, Pingpingjia O-10, FMEE and lauryl glucoside is 1:1.5:(1-2):(0.5-1.5).

7. A cleaning agent according to claim 6, characterized in that: The alkoxyethanol is specifically 2-(2-butoxyethoxy)ethanol, and the metal corrosion inhibitor is benzimidazole; The 2-(2-butoxyethoxy)ethanol has a mass percentage of 6-8%, and the benzimidazole has a mass percentage of 0.6-0.9%.

8. A method for preparing a cleaning agent, used to prepare the cleaning agent as described in any one of claims 1-7, characterized in that, Includes the following steps: First, nonionic surfactant and deionized water are heated and stirred together. Then, alkoxyethanol, metal corrosion inhibitor and EDTA are added. Stirring is continued until the solution is evenly dispersed. The pH value is adjusted to obtain the cleaning agent.

9. The method for preparing a cleaning agent according to claim 8, characterized in that: The pH value of the cleaning agent needs to be adjusted to 8-9.

10. The application of a cleaning agent, suitable for use with the cleaning agent as described in any one of claims 1-7, characterized in that: Used for precision cleaning of cast metal parts, machined metal parts, ground and milled metal parts, and engine oil tanks.

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