Fluid material for metal part polishing and preparation method thereof

Abstract

The invention relates to the field of metal part polishing machining materials, and particularly discloses a fluid material for metal part polishing and a preparation method thereof. The invention relates to a fluid material for polishing a metal piece. The fluid material is prepared from the following raw materials in parts by weight: 20-30 parts of hydroxyl-terminated polydimethylsiloxane, 42-50 parts of an abrasive material, 18-28 parts of ethanol, 5-8 parts of a lubrication stabilizer and 2-4 parts of a methyl vinyl ether / maleic anhydride copolymer, the preparation method comprises the following steps: adding the lubrication stabilizer and the methyl vinyl ether / maleic anhydride copolymer into ethanol, stirring and dispersing, adding the hydroxyl-terminated polydimethylsiloxane and the grinding material, heating, kneading and dispersing, and carrying out vacuum defoaming. The fluid material prepared in the invention is applied to metal part polishing, the fluid material has good temperature resistance and viscosity stability in the polishing process, the surface uniformity of the polished metal part is good, the problem that local nonuniformity or scratches are easily generated in the polishing process of the fluid material is solved, and the polishing efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of metal part grinding and processing materials, and more specifically, to a fluid material for metal part grinding and a preparation method thereof. Background Art

[0002] During the processing of metal parts, a grinding process is required to remove the roughness and burrs on the surface of the metal parts, making the surface of the metal parts smoother and brighter.

[0003] During the grinding process of metal parts, grinding agents are needed to assist in grinding. Grinding agents can play a role in better heat dissipation and improving the uniformity of grinding. Commonly used grinding agents are generally fluid materials, mainly composed of abrasives, lubricants and brighteners, with a certain viscosity and fluidity. When grinding, such as Figure 1 As shown, the fluid material is applied to the bottom of the grinding equipment, the metal part is fixed horizontally in the cavity of the grinding fixture at the top, the grinding fixture is driven to move downward, contact with the fluid material at the bottom and seal the fluid material in the cavity of the grinding fixture, and the grinding fixture is driven to fully grind the metal part with the assistance of the fluid material.

[0004] However, during the continuous grinding process, metal parts and grinding jigs are prone to generate heat, which makes the fluid material easily heated and unevenly dispersed. Local scratches or local unevenness are prone to appear on the surface of the metal parts. After the viscosity of the fluid material decreases, it is easy to flow out from the gaps in the grinding fixture, reducing the grinding efficiency. Summary of the Invention

[0005] In order to solve the problem that the existing fluid material used for metal part grinding is prone to uneven dispersion when heated, thereby reducing the local uniformity of metal part grinding, the present application provides a fluid material for metal part grinding and a preparation method thereof.

[0006] In a first aspect, the present application provides a fluid material for polishing metal parts, which adopts the following technical solution: A fluid material for polishing metal parts is prepared from the following raw materials in parts by weight: 20-30 parts of hydroxyl-terminated polydimethylsiloxane 42-50 parts of abrasive 18-28 parts of ethanol Lubricating stabilizer 5-8 parts methyl vinyl ether / maleic anhydride copolymer 2-4 parts.

[0007] By adopting the above technical solution, the fluid material of the present application uses ethanol as a dispersion system to disperse hydroxyl-terminated polydimethylsiloxane, abrasive, lubricating stabilizer and methyl vinyl ether / maleic anhydride copolymer. The hydroxyl-terminated polydimethylsiloxane has good viscosity stability and fluidity, can improve the stability and lubricity of the fluid material, and can produce a stable molecular chain interwoven system with the lubricating stabilizer and methyl vinyl ether / maleic anhydride copolymer, so that the abrasive is fully and evenly dispersed to form a fluid system with stable viscosity, so that the fluid material can better play a role in heat dissipation and improving polishing uniformity during the polishing process of metal parts. It has good temperature resistance and viscosity stability, avoids the problem of uneven dispersion of the fluid material due to heat generation of metal parts and polishing jigs, reduces local scratches and unevenness on the surface of metal parts, and can prevent the fluid material from flowing out of the gaps in the polishing fixture, thereby improving the polishing efficiency.

[0008] Preferably, the abrasive is made from the following raw materials in parts by weight: 55-65 parts of silicon carbide 6-10 parts of ethyl orthosilicate 12-18 parts water Catalyst 0.2-0.4 parts.

[0009] By adopting the above technical solution, under the action of a catalyst, ethyl orthosilicate is hydrolyzed and condensed in water to form a silica gel with a network structure. Silicon carbide is uniformly dispersed in the network structure of the silica gel. The prepared abrasive can be fully dispersed with the hydroxyl-terminated polydimethylsiloxane, lubricating stabilizer and methyl vinyl ether / maleic anhydride copolymer, which can further improve the viscosity stability of the fluid material.

[0010] Preferably, the abrasive is prepared by the following steps: Tetraethyl orthosilicate and a catalyst are added to water, and after the temperature is raised for reaction, silicon carbide is added and kneaded and dispersed to prepare an abrasive.

[0011] By adopting the above technical solution, ethyl orthosilicate is first reacted in water under the action of a catalyst, and then silicon carbide is added for kneading, which can improve the system uniformity of the abrasive.

[0012] Preferably, the reaction temperature is 55-65° C., and the reaction time is 2-3 h.

[0013] By adopting the above technical solution, the optimal reaction temperature and time can enable the complete hydrolysis and condensation of ethyl orthosilicate in water, thereby reducing the situation where the silica gel structure is unstable due to incomplete reaction or excessive reaction.

[0014] Preferably, the particle size of the silicon carbide is 1500-2000 mesh.

[0015] By adopting the above technical solution, silicon carbide with a better particle size can improve the grinding accuracy and flatness, avoid local scratches or unevenness on the surface of metal parts due to too fine or too coarse particle size, and improve the grinding quality.

[0016] Preferably, the catalyst is acetic acid and / or glycolic acid.

[0017] By adopting the above technical solution and selecting acetic acid and / or glycolic acid as catalyst, the catalyst has good catalytic efficiency and can cause tetraethyl orthosilicate to be hydrolyzed and condensed to a greater extent.

[0018] Preferably, the lubricating stabilizer is composed of pentaerythritol stearate and tetrapolyricinoleate in a weight ratio of 1:(3-4).

[0019] By adopting the above technical solution, pentaerythritol stearate and tetrapolyricinoleate with an optimal weight ratio are used as lubricating stabilizers, which have good lubricity and dispersion stability and can further improve the viscosity stability of the fluid material during the polishing process.

[0020] Preferably, the molecular weight of the hydroxyl-terminated polydimethylsiloxane is 1000-2000 and the viscosity is 1000-1500 cs.

[0021] By adopting the above technical solution, the hydroxyl-terminated polydimethylsiloxane with better molecular weight and viscosity has better fluidity and viscosity. If the viscosity is too high, it is easy to agglomerate and the flow dispersion is poor. If the viscosity is too low, the cohesion is poor and the flow is too large.

[0022] In a second aspect, the present application provides a method for preparing a fluid material for polishing metal parts, which adopts the following technical solution: A method for preparing a fluid material for polishing metal parts comprises the following steps: The lubricating stabilizer and methyl vinyl ether / maleic anhydride copolymer are added to ethanol, stirred and dispersed, and then hydroxyl-terminated polydimethylsiloxane and abrasive are added, heated and kneaded to disperse, and vacuum degassing is performed after dispersion to obtain a fluid material for polishing metal parts.

[0023] By adopting the above technical solution, the lubricating stabilizer and methyl vinyl ether / maleic anhydride copolymer are first dispersed in ethanol, then kneaded with hydroxyl-terminated polydimethylsiloxane and abrasive, and then vacuum degassing is performed, which helps to fully mix the ingredients, reduce the generation of bubbles, and ensure the uniformity of the fluid material performance.

[0024] Preferably, the kneading and dispersing time is 1-3 hours and the temperature is 45-55°C.

[0025] By adopting the above technical solution, the optimal kneading temperature and time can improve the dispersion uniformity of the system.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The fluid material for polishing metal parts of the present application is made of hydroxyl-terminated polydimethylsiloxane, abrasive, ethanol, lubricating stabilizer and methyl vinyl ether / maleic anhydride copolymer, and can be used for polishing metal parts. The fluid material plays a role in heat dissipation and improving polishing uniformity during the polishing process of metal parts. It has good temperature resistance and viscosity stability, avoids the problem of uneven dispersion of fluid materials caused by heat generated by metal parts and polishing jigs, reduces local scratches and unevenness on the surface of metal parts, and can prevent the fluid material from flowing out of the gaps in the polishing fixture, thereby improving the polishing efficiency.

[0027] 2. The abrasive is made of silicon carbide, tetraethyl orthosilicate, water, and a catalyst. The abrasive can be fully dispersed with hydroxyl-terminated polydimethylsiloxane, a lubricating stabilizer, and a methyl vinyl ether / maleic anhydride copolymer, and can further improve the viscosity stability of the fluid material.

[0028] 3. Pentaerythritol stearate and tetrapolyricinoleate are used as lubricating stabilizers, which have good lubricity and dispersion stability, and can further improve the viscosity stability of the fluid material during the polishing process. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic diagram of the state of fluid material during grinding in the background technology of this application. DETAILED DESCRIPTION

[0029] The present application is further described in detail below with reference to the embodiments.

[0030] The following are the sources and specifications of some raw materials of this application. The raw materials used in the preparation examples and examples of this application can be obtained from commercial sources, including but not limited to the following models and manufacturers. Raw materials with equivalent performance can be used: 1. Hydroxy-terminated polydimethylsiloxane: The molecular weight of hydroxy-terminated polydimethylsiloxane is 1000-2000 and the viscosity is 1000-1500cs; 2. Silicon carbide: The particle size of silicon carbide is 1500-2000 mesh; 3. Methyl vinyl ether / maleic anhydride copolymer: Xingyan, CAS No. 9011-16-9; 4. Tetraethyl orthosilicate: TEOS, electronic grade, Merck, Germany; 5. Pentaerythritol stearate: PETS, CAS No. 115-83-3; 6. Tetrapolyricinoleate: content 99%, Mingxin Chemical.

[0031] Abrasive Preparation Example Preparation Example 1 Preparation Example 1 discloses an abrasive, which is prepared by the following steps: 0.6 kg of ethyl orthosilicate and 0.02 kg of acetic acid are added as catalysts to 1.2 kg of water, the temperature is raised to 55°C and the reaction is carried out for 3 hours, 5.5 kg of 2000 mesh silicon carbide is added and kneaded and dispersed at a kneading temperature of 60-70°C to prepare the abrasive.

[0032] Preparation Example 2-3 The difference between Preparation Example 2-3 and Preparation Example 1 is that the amount of raw materials used and the preparation conditions are different. Please refer to Table 1 below for details.

[0033] Table 1 Parameters of Preparation Examples 1-3 Example

[0034] Example 1 Example 1 discloses a fluid material for polishing metal parts, which is prepared by the following steps: 0.5 kg of lubricating stabilizer (composed of pentaerythritol stearate and zinc stearate in a weight ratio of 1:3) and 0.2 kg of methyl vinyl ether / maleic anhydride copolymer are added to 1.8 kg of ethanol, stirred and dispersed at a temperature of 45°C for 60 minutes, and then 3 kg of hydroxyl-terminated polydimethylsiloxane and 4.2 kg of commercially available 2000-mesh silicon carbide are added as abrasives, and the temperature is increased and kneaded and dispersed. The kneading and dispersion time is 1 hour, the temperature is 55°C, and vacuum degassing is performed after dispersion to obtain a fluid material for grinding metal parts; the ethanol is anhydrous ethanol, and the content is 99%.

[0035] Example 2-3 The difference between Example 2-3 and Example 1 is that the sources and amounts of raw materials are different, see Table 2 below for details.

[0036] Table 2 Parameters of Examples 1-3 Examples 4-6 The difference between Examples 4-6 and Example 1 is that the sources of the abrasives are different, see Table 3 below for details.

[0037] Table 3 Abrasive sources of Examples 4-6 Example Abrasive source Example 4 Preparation Example 1 Example 5 Preparation Example 2 Example 6 Preparation Example 3 Example 7 The difference between Example 7 and Example 4 is that the lubricating stabilizer consists of pentaerythritol stearate and tetrapolyricinoleate in a weight ratio of 1:3, and the rest is the same as Example 4.

[0038] Example 8 The difference between Example 8 and Example 4 is that the lubricating stabilizer consists of pentaerythritol stearate and tetrapolyricinoleate in a weight ratio of 1:4, and the rest is the same as Example 4.

[0039] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that an equal amount of methyl vinyl ether / maleic anhydride copolymer is replaced by hydroxyl-terminated polydimethylsiloxane, and the rest is the same as Example 1.

[0040] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the lubricating stabilizer is replaced by methyl vinyl ether / maleic anhydride copolymer in equal amount, and the other components are the same as those in Example 1.

[0041] Performance testing The following performance tests were conducted on the metal workpiece polishing fluid materials prepared in Examples 1-8 and Comparative Examples 1-2: 1. Viscosity stability test: Test the viscosity change rate of the fluid material at 25°C and 45°C. Viscosity change rate (%) = (25°C viscosity - 45°C viscosity) / 25°C viscosity * 100%. Record the test results. 2. Polishing test: Use fluid material to grind carbon steel metal parts (carbon steel tools), take 15g of fluid material, control the grinding rate to 25 times / min, and grind for 3 minutes. Use a profilometer to test the flatness of the surface of the carbon steel metal parts. The test method is as follows: take five points at the top, bottom, left, right and middle positions corresponding to the carbon steel tool, test the roughness (Ra) of the five points respectively, and calculate the average roughness difference of the five points (unit: nm). The average roughness difference = |the sum of the roughness of each point - the average roughness of the 5 points| / 5. Test and record the test results.

[0042] The following are the performance test data of the fluid materials of Examples 1-8 and Comparative Examples 1-2, see Table 4 below for details.

[0043] Table 4 Performance data of Examples 1-8 and Comparative Examples 1-2 Combining Examples 1-3 and Examples 4-6 with Table 4, it can be concluded that the fluid material prepared using the abrasive of the present application has good viscosity stability and polishing smoothness. Compared with Example 1, Examples 4-6 have a significantly lower viscosity change rate and a significantly lower average roughness difference, indicating that the abrasive prepared by reacting ethyl orthosilicate, a catalyst, and water and kneading with silicon carbide has good dispersion uniformity and stability in the system.

[0044] Combining Example 4 with Examples 7-8 and Table 4, it can be concluded that using a lubricant stabilizer at an optimal weight ratio can improve the polishing smoothness of the fluid material while also improving viscosity stability. Compared to Example 4, Examples 7-8 showed a reduced viscosity change rate and a significantly lower average roughness difference. This is likely because the optimal weight ratio of the lubricant stabilizer improved the lubrication stability of the fluid material and alleviated the problem of localized unevenness in the fluid material at high temperatures.

[0045] In conjunction with Example 1 and Comparative Examples 1-2 and in conjunction with Table 4, can be drawn, using the hydroxyl-terminated polydimethylsiloxane, lubrication stabilizer and methyl vinyl ether / maleic anhydride copolymer of the present application, three have good synergy, and the fluid material obtained has good viscosity stability and polishing uniformity.Comparative Example 1 is compared to Example 1, and methyl vinyl ether / maleic anhydride copolymer is replaced in equal amounts by hydroxyl-terminated polydimethylsiloxane, and the viscosity rate of change of the fluid material obtained improves, and roughness average difference also improves.Comparative Example 2 is compared to Example 1, and lubrication stabilizer is replaced in equal amounts by methyl vinyl ether / maleic anhydride copolymer, and the viscosity rate of change of the fluid material obtained slightly improves, and roughness average difference also improves, may be because the synergy of the three is reduced in Comparative Example 1 and Comparative Example 2, the performance of the fluid material is reduced.

[0046] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A fluid material for polishing metal parts, characterized in that: It is prepared from the following raw materials in parts by weight: 20-30 parts of hydroxyl-terminated polydimethylsiloxane 42-50 parts of abrasive 18-28 parts of ethanol 5-8 parts lubricating stabilizer 2-4 parts of methyl vinyl ether / maleic anhydride copolymer.

2. The fluid material for metal workpiece polishing according to claim 1, characterized in that: The abrasive is prepared from the following raw materials in parts by weight: 55-65 parts of silicon carbide 6-10 parts of ethyl orthosilicate 12-18 parts water 0.2-0.4 parts of catalyst.

3. The fluid material for metal polishing according to claim 2, characterized in that: The abrasive is prepared by the following steps: Tetraethyl orthosilicate and a catalyst are added to water, and after the temperature is raised for reaction, silicon carbide is added and kneaded and dispersed to prepare an abrasive.

4. The fluid material for metal workpiece polishing according to claim 2, characterized in that: The reaction temperature is 55-65°C and the reaction time is 2-3h.

5. The fluid material for metal workpiece polishing according to claim 2, characterized in that: The particle size of the silicon carbide is 1500-2000 mesh.

6. The fluid material for metal workpiece polishing according to claim 2, characterized in that: The catalyst is acetic acid and / or glycolic acid.

7. The fluid material for metal workpiece polishing according to claim 1, characterized in that: The lubricating stabilizer consists of pentaerythritol stearate and tetrapolyricinoleate in a weight ratio of 1:(3-4).

8. The fluid material for metal workpiece polishing according to claim 1, characterized in that: The molecular weight of the hydroxyl-terminated polydimethylsiloxane is 1000-2000 and the viscosity is 1000-1500 cs.

9. A method for preparing a fluid material for polishing metal parts according to any one of claims 1 to 8, characterized in that: The following steps are involved: The lubricating stabilizer and methyl vinyl ether / maleic anhydride copolymer are added to ethanol, stirred and dispersed, and then hydroxyl-terminated polydimethylsiloxane and abrasive are added, heated and kneaded to disperse, and vacuum degassing is performed after dispersion to obtain a fluid material for polishing metal parts.

10. The method for preparing a fluid material for metal workpiece polishing according to claim 9, characterized in that: The kneading and dispersing time is 1-3h, and the temperature is 45-55℃.

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