Polishing agent for cleaning and preparation method thereof

Abstract

The invention provides a polishing agent for cleaning and a preparation method thereof, and belongs to the technical field of metal polishing agents, the polishing agent for cleaning comprises a functional component and a solvent, and the mass ratio of the functional component to the solvent is 1: (4-5); the functional components comprise the following components in parts by weight: 11-14 parts of hydrophobic modified SiO2, 5-6 parts of a surfactant, 6-8 parts of a surface aggressive agent, 3-3.5 parts of a defoaming agent and 2-2.4 parts of a stabilizer; the surface aggressive agent is prepared by adsorbing acid liquor by alkalized activated carbon; the solvent is an ethanol water solution with the mass fraction of 45-50%; the polishing agent for cleaning is used for directly cleaning and polishing stainless steel with grease attached to the surface. It is ensured that the prepared polishing agent can conduct oil stain cleaning and polishing at the same time, the polishing efficiency is improved, the metal glossiness is improved, and meanwhile the metal surface roughness is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of metal polishing agents, and in particular relates to a polishing agent for cleaning and a preparation method thereof. Background Art

[0002] During the machining, storage, transportation and manufacturing process of metal parts, a layer of oil stains often remains on their surface due to the use of oil-containing materials. These oil stains include machine oil, cutting oil, lubricating oil, etc., and the bonding strength with the metal surface varies. Some even bond tightly to the metal surface, forming an oil film that is difficult to remove. For the oil stains on the surface of metal parts, it is usually necessary to degrease and clean them first. This step is crucial for the subsequent polishing process, because the presence of oil stains will prevent the abrasive / chemical components in the polishing agent from fully contacting the metal surface, affecting the use of the polishing agent, thereby reducing the polishing effect and even causing polishing failure.

[0003] Therefore, before using polishing agents, metal parts are generally thoroughly degreased and cleaned. This can be achieved through a variety of methods, such as solvent-based metal cleaners, water-based metal cleaners, ultrasonic cleaning, etc. Choosing the right cleaning method and cleaning agent can effectively remove oil and other contaminants on the metal surface, creating good conditions for subsequent polishing.

[0004] However, the cleaning process before polishing is relatively complicated, and the added cleaning process prolongs the polishing period, resulting in reduced polishing efficiency. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a polishing agent for cleaning and a preparation method thereof, which ensures that the prepared polishing agent can simultaneously clean oil stains and polish, improve the polishing efficiency, and increase the gloss of the metal while reducing the roughness of the metal surface.

[0006] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a polishing agent for cleaning, comprising a functional component and a solvent, wherein the mass ratio of the functional component to the solvent is 1:(4-5);

[0007] The functional components include the following components by weight: 11-14 parts of hydrophobically modified SiO2, 5-6 parts of surfactants, 6-8 parts of surface erosion agents, 3-3.5 parts of defoamers and 2-2.4 parts of stabilizers; the surface erosion agent is prepared by alkalizing activated carbon to absorb acid solution;

[0008] The solvent is an ethanol aqueous solution with a mass fraction of 45-50%;

[0009] The cleaning polishing agent is used to directly clean and polish stainless steel with grease attached to the surface.

[0010] Furthermore, the preparation method of the hydrophobically modified SiO2 is as follows:

[0011] A1. Disperse 10 g of SiO2 particles in 140-160 mL of anhydrous ethanol, add 18-22 mL of deionized water and 28-32 g of aqueous ammonia, stir for 30-40 min, then add 5-6 g of dodecyltriethoxysilane, react at 80-85 ° C for 5-6 h to obtain the product;

[0012] A2. The product obtained in A1 is washed several times by centrifugation with anhydrous ethanol to remove residual impurities such as dodecyltriethoxysilane and ammonia water, and then vacuum dried at 60-65°C for 11-12h to obtain hydrophobically modified SiO2.

[0013] Furthermore, the preparation method of the surface etching agent is as follows: 20g of alkaline activated carbon is added to 30-40mL of acid solution, stirred at room temperature for 10-15min, then allowed to stand for 1-1.5h, filtered out, and drained at room temperature to obtain the surface etching agent.

[0014] Furthermore, the preparation method of the alkalized activated carbon is as follows:

[0015] B1. After heating the activated carbon at 110-120° C. in vacuum for 1-1.5 h, 10 g of the activated carbon was put into a flask, and 500 mL of a 2 mol / L lithium hydroxide aqueous solution was added. After mixing, the mixture was heated to 45-55° C. with a rotary evaporator while stirring. At the same time, the water evaporated from the flask was removed by suction with an aspirator until it was dried, thereby obtaining alkali-treated activated carbon.

[0016] B2. Fill the alkali-treated activated carbon obtained in B1 into the treatment chamber, use a vacuum pump to reduce the pressure of the treatment chamber to below 133 Pa, and then irradiate the treatment chamber with 300 W microwaves (2.5 GHz) to make it reach a plasma state. After 2 minutes, stop the microwave irradiation, take out, wash and filter repeatedly with 500 mL of water until the pH of the filtrate is 7, and dry to obtain the alkalized activated carbon.

[0017] Furthermore, the acid solution includes sulfuric acid or nitric acid.

[0018] Furthermore, the surfactant includes any one of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and alkyl alcohol amide.

[0019] Furthermore, the defoaming agent includes polyamide and polysiloxane, and the mass ratio of the two is 1:3.

[0020] Furthermore, the stabilizer includes zinc stearate and tin sulfate, and the mass ratio of the two is 1:1.

[0021] In a second aspect, the present invention provides a method for preparing the above-mentioned polishing agent for cleaning, comprising the following steps:

[0022] S1. Stirring the hydrophobically modified SiO2, surfactant, surface erosion agent, defoamer and stabilizer at a constant speed of 250-280 r / min for 30-40 min to obtain a functional component;

[0023] S2. Add the functional components obtained in S1 into a solvent and stir at a constant speed of 100-120 r / min for 2-3 min to obtain a polishing agent for cleaning.

[0024] This application has the following beneficial effects:

[0025] The polishing agent for cleaning prepared by the present invention can be used to directly clean and polish stainless steel with grease attached to the surface; there is no need to perform cleaning before polishing, which shortens the polishing period and improves the polishing efficiency. In addition, the polishing effect is excellent.

[0026] In the preparation of the polishing agent for cleaning, firstly, the hydrophobically modified SiO2 performs well in grease adsorption. Due to its strong surface hydrophobicity, it can effectively adsorb grease molecules from the water environment, so that the surface of the hydrophobically modified SiO2 is evenly coated with grease, thereby weakening its cutting and rolling pressure on the stainless steel metal surface to a certain extent, thereby obtaining a suitable cutting and rolling pressure. Secondly, a surface etchant is added as a component, which continuously releases acid in a vibrating ethanol solution and continuously corrodes the stainless steel surface. On the one hand, it helps to quickly remove the oil stains on the stainless steel surface and weaken the negative impact of the surface attached oil stains on the polishing effect; on the other hand, it assists the hydrophobically modified SiO2 to perform a moderate polishing treatment on the stainless steel surface. A synergistic effect is produced between the hydrophobically modified SiO2 and the surface etchant, which can synergistically improve the final polishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 , a comparative trend chart of gloss test data after polishing clean / oily stainless steel with polishing agents prepared in Examples 1 to 4 of the present invention and Comparative Examples 1 to 3;

[0028] Figure 2 , a comparative trend chart of surface roughness test data after polishing clean / oily stainless steel with the polishing agents prepared in Examples 1 to 4 of the present invention and Comparative Examples 1 to 3. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with embodiments.

[0030] Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application are all commercially available.

[0031] Example 1: (1) Preparation of hydrophobically modified SiO2, the preparation method thereof is as follows:

[0032] A1. Disperse 10 g of SiO2 particles in 150 mL of anhydrous ethanol, add 20 mL of deionized water and 30 g of ammonia water, stir for 35 min, then add 5.5 g of dodecyltriethoxysilane, react at 82 °C for 5.5 h to obtain the product.

[0033] A2. The product obtained in A1 was washed three times by centrifugation with anhydrous ethanol to remove residual impurities such as dodecyltriethoxysilane and ammonia water, and then dried under vacuum at 62° C. for 11.5 h to obtain hydrophobically modified SiO2.

[0034] (2) A surface etching agent is prepared as follows: 20 g of alkaline activated carbon is added to 35 mL of sulfuric acid (98% by mass), stirred at room temperature for 12 min, allowed to stand for 1.2 h, filtered out, and drained at room temperature (30 min) to obtain the surface etching agent.

[0035] Wherein, the preparation method of alkalized activated carbon is as follows:

[0036] B1. After heating the activated carbon at 115°C in vacuum for 1.2h, take 10g of it and put it into a flask. Add 500mL of 2mol / L lithium hydroxide aqueous solution, mix it, and heat it to 50°C with stirring on a rotary evaporator. At the same time, use an aspirator to remove the water evaporated from the flask until it is dry to obtain alkali-treated activated carbon.

[0037] B2. Fill the alkali-treated activated carbon obtained in B1 into the treatment chamber, reduce the pressure of the treatment chamber to 100 Pa with a vacuum pump, and then irradiate the treatment chamber with 300 W microwaves (2.5 GHz) to make it reach a plasma state. After 2 minutes, stop the microwave irradiation, take out, wash and filter repeatedly with 500 mL of water until the pH of the filtrate is 7, and dry to obtain the alkalized activated carbon.

[0038] (3) preparing a polishing agent for cleaning, the preparation method comprising the following steps:

[0039] S1. By weight, 13 parts of hydrophobically modified SiO2, 5.5 parts of surfactant, 7 parts of surface erosion agent, 3.2 parts of defoaming agent and 2.2 parts of stabilizer were stirred at 260 r / min for 35 min to obtain a functional component.

[0040] S2. Add the functional component obtained in S1 into a 48% ethanol aqueous solution, the mass ratio of the functional component to the 48% ethanol aqueous solution is 1:4.5, and stir at a constant speed of 110 r / min for 2.5 minutes to obtain a polishing agent for cleaning. The polishing agent for cleaning can be used to directly clean and polish stainless steel with grease attached to the surface.

[0041] Among them, the surfactant is fatty alcohol polyoxyethylene ether, which is purchased from Hai'an Petrochemical Plant in Jiangsu Province. The defoaming agent includes polyamide and polysiloxane, and the mass ratio of the two is 1:3. The polyamide is PA66 (DuPont FR50 GY337, USA). The polysiloxane is a double-terminated carboxyl silicone oil with a molecular weight of 2000, which is purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd. The stabilizer includes zinc stearate and tin sulfate, and the mass ratio of the two is 1:1. Zinc stearate is purchased from Shandong Xuchen Chemical Technology Co., Ltd. Tin sulfate (99%, Amresco) is purchased from Shanghai Yansheng Industrial Co., Ltd.

[0042] Example 2: The difference between this example and Example 1 is that a polishing agent for cleaning is prepared, and the preparation method thereof comprises the following steps:

[0043] S1. By weight, 11 parts of hydrophobically modified SiO2, 5 parts of surfactant, 6 parts of surface erosion agent, 3 parts of defoaming agent and 2 parts of stabilizer were stirred at 250 r / min for 40 min to obtain a functional component.

[0044] S2. Add the functional component obtained in S1 into a 45% ethanol aqueous solution, the mass ratio of the functional component to the 45% ethanol aqueous solution is 1:5, and stir at a constant speed of 100 r / min for 3 minutes to obtain a polishing agent for cleaning. The polishing agent for cleaning can be used to directly clean and polish stainless steel with grease attached to the surface.

[0045] The surfactant is fatty alcohol polyoxyethylene ether, the defoamer includes polyamide and polysiloxane, and the mass ratio of the two is 1:3, and the stabilizer includes zinc stearate and tin sulfate, and the mass ratio of the two is 1:1.

[0046] Example 3: The difference between this example and Example 1 is that a polishing agent for cleaning is prepared, and the preparation method thereof comprises the following steps:

[0047] S1. By weight, 14 parts of hydrophobically modified SiO2, 6 parts of surfactant, 8 parts of surface erosion agent, 3.5 parts of defoaming agent and 2.4 parts of stabilizer were stirred at 280 r / min for 30 min to obtain a functional component.

[0048] S2. Add the functional component obtained in S1 into a 50% ethanol aqueous solution, the mass ratio of the functional component to the 50% ethanol aqueous solution is 1:4, and stir at a constant speed of 120 r / min for 2 minutes to obtain a polishing agent for cleaning. The polishing agent for cleaning can be used to directly clean and polish stainless steel with grease attached to the surface.

[0049] The surfactant is fatty alcohol polyoxyethylene ether, the defoamer includes polyamide and polysiloxane, and the mass ratio of the two is 1:3, and the stabilizer includes zinc stearate and tin sulfate, and the mass ratio of the two is 1:1.

[0050] Example 4: This example differs from Example 1 in that a polishing agent for cleaning is prepared, and the preparation method thereof comprises the following steps:

[0051] S1. By weight, 12 parts of hydrophobically modified SiO2, 5 parts of surfactant, 8 parts of surface erosion agent, 3 parts of defoaming agent and 2.4 parts of stabilizer were stirred at 260 r / min for 35 min to obtain a functional component.

[0052] S2. Add the functional component obtained in S1 into a 47% ethanol aqueous solution, the mass ratio of the functional component to the 47% ethanol aqueous solution is 1:4.8, and stir at a constant speed of 110 r / min for 2 minutes to obtain a polishing agent for cleaning. The polishing agent for cleaning can be used to directly clean and polish stainless steel with grease attached to the surface.

[0053] The surfactant is fatty alcohol polyoxyethylene ether, the defoamer includes polyamide and polysiloxane, and the mass ratio of the two is 1:3, and the stabilizer includes zinc stearate and tin sulfate, and the mass ratio of the two is 1:1.

[0054] Comparative Example 1: The difference between this comparative example and Example 1 is that the hydrophobically modified SiO2 is replaced by SiO2, and the surface corrosive agent is deleted.

[0055] Specifically, a polishing agent for cleaning is prepared, and the preparation method thereof comprises the following steps:

[0056] S1. By weight, 13 parts of SiO2, 5.5 parts of surfactant, 3.2 parts of defoamer and 2.2 parts of stabilizer were stirred at 260 r / min for 35 min to obtain functional ingredients.

[0057] S2. Add the functional component obtained in S1 into a 48% ethanol aqueous solution, the mass ratio of the functional component to the 48% ethanol aqueous solution is 1:4.5, and stir at a constant speed of 110 r / min for 2.5 minutes to obtain a polishing agent for cleaning. The polishing agent for cleaning can be used to directly clean and polish stainless steel with grease attached to the surface.

[0058] Comparative Example 2: The difference between this comparative example and Example 1 is that the surface etching agent is deleted.

[0059] Specifically, a polishing agent for cleaning is prepared, and the preparation method thereof comprises the following steps:

[0060] S1. By weight, 13 parts of hydrophobically modified SiO2, 5.5 parts of surfactant, 3.2 parts of defoamer and 2.2 parts of stabilizer were stirred at 260 r / min for 35 min to obtain a functional component.

[0061] S2. Add the functional component obtained in S1 into a 48% ethanol aqueous solution, the mass ratio of the functional component to the 48% ethanol aqueous solution is 1:4.5, and stir at a constant speed of 110 r / min for 2.5 minutes to obtain a polishing agent for cleaning. The polishing agent for cleaning can be used to directly clean and polish stainless steel with grease attached to the surface.

[0062] Comparative Example 3: The difference between this comparative example and Example 1 is that the hydrophobically modified SiO2 is replaced by SiO2.

[0063] Specifically, a polishing agent for cleaning is prepared, and the preparation method thereof comprises the following steps:

[0064] S1. By weight, 13 parts of SiO2, 5.5 parts of surfactant, 7 parts of surface erosion agent, 3.2 parts of defoaming agent and 2.2 parts of stabilizer were stirred at 260 r / min for 35 min to obtain functional ingredients.

[0065] S2. Add the functional component obtained in S1 into a 48% ethanol aqueous solution, the mass ratio of the functional component to the 48% ethanol aqueous solution is 1:4.5, and stir at a constant speed of 110 r / min for 2.5 minutes to obtain a polishing agent for cleaning. The polishing agent for cleaning can be used to directly clean and polish stainless steel with grease attached to the surface.

[0066] Test example: Test object: Polishing agents were prepared according to Examples 1 to 4 and Comparative Examples 1 to 3.

[0067] Test items: ① Glossiness; ② Surface roughness.

[0068] Test method: Clean the 304 stainless steel to obtain clean stainless steel; apply a layer of lubricating grease (load 0.6 g / cm 2 ) to obtain oily stainless steel; place the clean stainless steel / oily stainless steel in a polishing agent at 55°C, shake it for 10 minutes, the shaking frequency is 36 times / min, then take it out, dry it, and conduct the detection of each test item.

[0069] Test results: See Table 1.

[0070] Table 1. Test data of the experimental example

[0071] Stainless steel Glossiness / ° Surface roughness / μm Example 1 Oil pollution 84 0.39 Example 2 Oil pollution 84 0.41 Example 3 Oil pollution 85 0.38 Example 4 Oil pollution 85 0.41 Comparative Example 1-1 Clean 82 0.43 Comparative Example 1-2 Oil pollution 76 0.48 Comparative Example 2 Oil pollution 73 0.53 Comparative Example 3 Oil pollution 80 0.44

[0072] Result analysis: Analyze Example 1-Example 4 and combine the data in Table 1 and Figure 1-Figure 2 It can be seen that the polishing agent for cleaning prepared by the present invention can be used to directly clean and polish stainless steel with grease on the surface, without the need for cleaning before polishing, thus shortening the polishing period and improving the polishing efficiency. Moreover, after the oily stainless steel is treated, the glossiness reaches above 84°, the surface roughness is as low as below 0.41μm, and the polishing effect is excellent.

[0073] Analyze Example 1, Comparative Example 1-1, Comparative Example 1-2, Comparative Example 2 and Comparative Example 3 and combine the data in Table 1 and Figure 1-Figure 2 By comparing Comparative Example 1-1 and Comparative Example 1-2, it can be seen that compared with polishing clean stainless steel, when ordinary polishing agents are directly used to polish oily stainless steel, the final polishing effect is significantly reduced. This is because when there is oil on the metal surface, these oils will form an isolation layer, which prevents the silica abrasive from directly acting on the stainless steel metal surface and affects the polishing effect. The presence of oil makes it impossible for the silica abrasive to act evenly on the entire stainless steel metal surface during the polishing process, resulting in some areas not being fully polished, thereby reducing the final glossiness. At the same time, due to the isolation effect of the oil, the cutting and rolling pressure of the silica abrasive on the stainless steel metal surface is uneven, which will also increase the surface roughness.

[0074] From the comparison between Comparative Example 1 and Comparative Example 2, it can be seen that when directly polishing oily stainless steel, replacing the abrasive SiO2 in the polishing agent with hydrophobically modified SiO2 will cause the final polishing effect to further decrease. This is because the hydrophobically modified silica performs well in grease adsorption. Due to its strong surface hydrophobicity, it can effectively adsorb grease molecules from the water environment, so that the surface of the hydrophobically modified silica is coated with grease, resulting in a further decrease in the polishing effect, resulting in a decrease in the glossiness of the polished stainless steel and an increase in the surface roughness.

[0075] By comparing Comparative Example 1 with Comparative Example 3, it can be seen that when directly polishing oily stainless steel, adding the surface etchant of the present invention to the polishing agent can improve the final polishing effect. This is because the surface etchant continuously releases acid in the oscillating ethanol solution to continuously erode the stainless steel surface, which, on the one hand, helps to quickly remove the surface oil and weaken the effect of the oil on the polishing effect of the silica abrasive; on the other hand, it assists the silica abrasive to quickly polish the stainless steel surface, thereby improving the polishing effect.

[0076] By comparison with Example 1, it can be seen that when directly polishing oily stainless steel, the abrasive SiO2 in the polishing agent is replaced by hydrophobically modified SiO2, and the surface etching agent of the present invention is added to the polishing agent. The hydrophobically modified SiO2 and the surface etching agent can produce a synergistic effect, which synergistically improves the final polishing effect.

[0077] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0078] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A polishing agent for cleaning, characterized in that It comprises a functional component and a solvent, wherein the mass ratio of the functional component to the solvent is 1:(4-5); The functional components include the following components by weight: 11-14 parts of hydrophobically modified SiO2, 5-6 parts of surfactants, 6-8 parts of surface erosion agents, 3-3.5 parts of defoamers and 2-2.4 parts of stabilizers; the surface erosion agent is prepared by alkalizing activated carbon to absorb acid solution; The solvent is an ethanol aqueous solution with a mass fraction of 45-50%; The cleaning polishing agent is used to directly clean and polish stainless steel with grease attached to the surface.

2. The polishing agent for cleaning according to claim 1, characterized in that The preparation method of the hydrophobically modified SiO2 is as follows: A1. Disperse 10 g of SiO2 particles in 140-160 mL of anhydrous ethanol, add 18-22 mL of deionized water and 28-32 g of aqueous ammonia, stir for 30-40 min, then add 5-6 g of dodecyltriethoxysilane, react at 80-85 ° C for 5-6 h to obtain the product; A2. The product obtained in A1 is washed several times by centrifugation with anhydrous ethanol, and then vacuum dried at 60-65°C for 11-12h to obtain hydrophobically modified SiO2.

3. The polishing agent for cleaning according to claim 1, characterized in that The preparation method of the surface etching agent is as follows: 20g of alkaline activated carbon is put into 30-40mL of acid solution, stirred at room temperature for 10-15min, and then allowed to stand for 1-1.5h, filtered out, and drained at room temperature to obtain the surface etching agent.

4. The polishing agent for cleaning according to claim 3, characterized in that The preparation method of the alkalized activated carbon is as follows: B1. After heating the activated carbon at 110-120° C. in vacuum for 1-1.5 h, 10 g of the activated carbon was put into a flask, and 500 mL of a 2 mol / L lithium hydroxide aqueous solution was added. After mixing, the mixture was heated to 45-55° C. with a rotary evaporator while stirring. At the same time, the water evaporated from the flask was removed by suction with an aspirator until it was dried, thereby obtaining alkali-treated activated carbon. B2. Place the alkali-treated activated carbon obtained in B1 in a treatment chamber, reduce the pressure to below 133 Pa, and irradiate the treatment chamber with microwaves to make it reach a plasma state. After 2 minutes, stop the microwave irradiation, take out, wash and filter repeatedly with water until the pH of the filtrate is 7, and dry to obtain alkalized activated carbon.

5. The polishing agent for cleaning according to claim 3, characterized in that The acid solution includes sulfuric acid or nitric acid.

6. The polishing agent for cleaning according to claim 1, characterized in that The surfactant includes any one of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether and alkyl alcohol amide.

7. The polishing agent for cleaning according to claim 1, characterized in that The defoaming agent comprises polyamide and polysiloxane, and the mass ratio of the two is 1:

3.

8. The polishing agent for cleaning according to claim 1, characterized in that The stabilizer includes zinc stearate and tin sulfate, and the mass ratio of the two is 1:

1.

9. A method for preparing a polishing agent for cleaning according to any one of claims 1 to 8, characterized in that: The steps include: S1. Stirring the hydrophobically modified SiO2, surfactant, surface erosion agent, defoamer and stabilizer at a constant speed of 250-280 r / min for 30-40 min to obtain a functional component; S2. Add the functional components obtained in S1 into a solvent and stir at a constant speed of 100-120 r / min for 2-3 min to obtain a polishing agent for cleaning.

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