CN107353580B - Resin-based grinding tool and preparation method thereof - Google Patents
Resin-based grinding tool and preparation method thereof Download PDFInfo
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- CN107353580B CN107353580B CN201710481654.4A CN201710481654A CN107353580B CN 107353580 B CN107353580 B CN 107353580B CN 201710481654 A CN201710481654 A CN 201710481654A CN 107353580 B CN107353580 B CN 107353580B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract
The invention discloses a resin-based grinding tool and a preparation method thereof, wherein the preparation method comprises the following steps: 1) pre-dispersing the abrasive material: mixing and dispersing the grinding material and the dispersing agent to prepare pre-dispersed particles; 2) preparation of premix: mixing the pre-dispersed particles prepared in the step 1), a resin material and an additive to prepare a premix; 3) coating the abrasive: shaping and coating the micro-nano particles of the premix prepared in the step 2) to prepare composite particles; 4) molding and hardening: and (3) pressing the composite particles prepared in the step 3), and hardening to prepare the resin-based grinding tool. Through the design, the phenomenon of 'half-growth' in the forming and hardening process of the thick-wall resin-based grinding tool can be overcome, and the operation stability and the service life of the thick-wall resin-based grinding tool are improved.
Description
Technical Field
The invention relates to the field of production and preparation of grinding tools, in particular to a resin-based grinding tool and a preparation method thereof.
Background
In the fields of precision manufacturing and fine machining, such as: in the fields of bearing ball, polysilicon, monocrystalline silicon, mobile phone screen polishing and the like, a resin-based grinding tool is a commonly used polishing tool. Due to the influences of low thermal conductivity of the resin matrix and easy scorching during long-time hot pressing, the thick-wall resin-based grinding tool is commonly subjected to the condition of 'half-growth' in the forming and hardening process, so the operation stability and the service life of the thick-wall resin-based grinding tool are seriously influenced.
Therefore, the invention provides a resin-based grinding tool which can overcome the phenomenon of 'half-growth' in the forming and hardening process of a thick-wall resin-based grinding tool, improve the operation stability and prolong the service life of the resin-based grinding tool and a preparation method thereof, and aims to solve the problems in urgent need.
Disclosure of Invention
Aiming at the prior art, the invention aims to solve the problem that the operation stability and the service life of a thick-wall resin-based grinding tool are seriously influenced by the fact that the resin-based grinding tool, especially the thick-wall resin-based grinding tool, in the prior art is influenced by low heat conductivity of a resin matrix and easy scorching due to long-time hot pressing and the phenomenon of 'half-growth' generally exists in the forming and hardening process of the thick-wall resin-based grinding tool, so that the resin-based grinding tool and the preparation method thereof can overcome the phenomenon of 'half-growth' in the forming and hardening process of the thick-wall resin-based grinding tool and improve the operation stability and.
In order to achieve the above object, the present invention provides a method for preparing a resin-based abrasive tool, wherein the method comprises:
1) pre-dispersing the abrasive material: mixing and dispersing the grinding material and the dispersing agent to prepare pre-dispersed particles;
2) preparation of premix: mixing the pre-dispersed particles prepared in the step 1), a resin material and an additive to prepare a premix;
3) coating the abrasive: shaping and coating the micro-nano particles of the premix prepared in the step 2) to prepare composite particles;
4) molding and hardening: and (3) pressing the composite particles prepared in the step 3), and hardening to prepare the resin-based grinding tool.
The invention also provides a resin-based grinding tool prepared by the preparation method.
According to the technical scheme, the abrasive and the dispersing agent are mixed and dispersed to prepare pre-dispersed particles, the resin material and the additive are mixed to prepare the premix, the premix is subjected to micro-nano particle shaping and coating to form spherical or approximately spherical composite particles with a core-shell structure, wherein the core is the resin material (usually the resin is in a granular structure), the shell is the processed abrasive (namely, the abrasive mixed and dispersed by the dispersing agent, namely, the pre-dispersed particles) and the additive, the composite particles are pressed and then placed into a furnace for hardening, and in the forming and hardening process, the processed abrasive (namely, the pre-dispersed particles) on the surfaces of the composite particles are mutually contacted to form a three-dimensional interconnected heat conduction network structure. Therefore, the heat conductivity of the resin material is improved through the formed three-dimensional intercommunicated heat conducting network structure, so that the heat can be rapidly transferred to the inside in the forming and hardening process, the phenomenon that the inside of the prepared resin-based grinding tool is half-cooked is avoided, and meanwhile, due to the existence of the processes of preparation of pre-dispersed particles and the like, the material mixing time can be greatly shortened in the whole preparation process, and the production efficiency is improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a micro-nano particle reshaping and coating apparatus provided by the present invention;
fig. 2 is a schematic structural diagram of a composite particle provided by the present invention.
Description of the reference numerals
1-core 2-shell
3-feeding port 4-discharging port
5-circulation channel 6-rotor blade.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a preparation method of a resin-based grinding tool, wherein the preparation method comprises the following steps:
1) pre-dispersing the abrasive material: mixing and dispersing the grinding material and the dispersing agent to prepare pre-dispersed particles;
2) preparation of premix: mixing the pre-dispersed particles prepared in the step 1), a resin material and an additive to prepare a premix;
3) coating the abrasive: shaping and coating the micro-nano particles of the premix prepared in the step 2) to prepare composite particles;
4) molding and hardening: and (3) pressing the composite particles prepared in the step 3), and hardening to prepare the resin-based grinding tool.
The design is that abrasive and dispersant are mixed and dispersed to prepare pre-dispersed particles, then the pre-dispersed particles, resin material and additive are mixed to prepare premix, the premix is subjected to micro-nano particle shaping and coating to form spherical or near-spherical composite particles with a core-shell structure, wherein the core is resin material (usually resin is in a granular structure), the shell is processed abrasive (namely, the abrasive mixed and dispersed by the dispersant, namely, the pre-dispersed particles) and the additive, the composite particles are pressed and then put into a furnace for hardening, and the processed abrasive (namely, the pre-dispersed particles) on the surfaces of the composite particles are contacted with each other in the forming and hardening process to form a three-dimensional interconnected heat conduction network structure. Therefore, the heat conductivity of the resin material is improved through the formed three-dimensional intercommunicated heat conducting network structure, so that the heat can be rapidly transferred to the inside in the forming and hardening process, the phenomenon that the inside of the prepared resin-based grinding tool is half-cooked is avoided, and meanwhile, due to the existence of the processes of preparation of pre-dispersed particles and the like, the material mixing time can be greatly shortened in the whole preparation process, and the production efficiency is improved.
Of course, the dispersant here may be of a type conventionally used in the art as long as it is suitable for use in dispersion of an abrasive, a resin material. Those skilled in the art can select the target according to actual needs, and details are not repeated herein.
Of course, the amount of each raw material used herein may be adjusted according to actual needs, for example, in a preferred embodiment of the present invention, the amount of the dispersant is 10 to 30 parts by weight, the amount of the resin material is 1200 to 1800 parts by weight, and the amount of the additive is 20 to 60 parts by weight, relative to 100 parts by weight of the abrasive.
The mixing and dispersing in step 1) can be performed according to a suitable manner in the art, for example, in a preferred embodiment, the mixing and dispersing process in step 1) can be performed by placing the abrasive and the dispersing agent in a high-speed mixer for mixing and dispersing, and of course, the high-speed mixer can be selected according to actual needs, which is not described herein again. The mixing and dispersing time can be further selected to be 2-10min, and the mixing and dispersing temperature can be further selected to be 70-90 ℃.
The abrasive herein may be selected conventionally, and for example, may be a natural abrasive (e.g., natural corundum, etc.), an artificial corundum-based abrasive, or a silicon carbide-based abrasive, which is conventionally used in the art, and in a more preferred embodiment of the present invention, the abrasive may be further selected from one or more of diamond powder, corundum powder, cubic boron nitride powder, nickel-plated corundum powder, and silicon nitride powder.
In order to further improve the later use performance and the processing performance of the prepared composite particles, the granularity of the grinding material can be further selected to be 325-10000 meshes.
Likewise, in a more preferred embodiment of the present invention, the mixing in step 2) may be carried out in a blender, and the mixing time may be selected to be 5-30min, and the rotation speed of the blender may be selected to be 1200-.
In a further preferred embodiment, the compounder may be further selected from high-speed stirring type compounder in order to further improve the properties of the prepared premix.
Of course, the resin material herein may be selected from the types of resins commonly used in the art for making resin-based abrasive articles, for example, in a preferred embodiment, the resin material may be selected from phenolic resins and polyimide resins in order to further enhance the performance properties of the resulting resin-based abrasive articles.
In a further preferred embodiment, the phenolic resin is used in an amount of 55 to 60 wt% and the polyimide resin is used in an amount of 40 to 45 wt%, based on the total weight of the resin material.
In order to further enhance the performance of the resulting abrasive article, in a more preferred embodiment, the particle size of the resin material may be further selected to be 50-800 mesh.
The additives herein may be selected according to the actual requirements, for example, in a preferred embodiment, the additives are selected from copper powder and/or aluminum powder. Of course, the present invention is not limited thereto, and those skilled in the art can adjust the above-mentioned parameters based on the above-mentioned basic information, and the detailed description thereof is omitted here.
In a further preferred embodiment, the particle size of the additive may be further selected to be 325-5000 mesh.
The micro-nano particle shaping and coating process in the step 3) can be performed according to a conventional manner in the art, for example, the step 3) is to place the prepared premix in micro-nano particle shaping and coating equipment for processing, for example, the structure of the micro-nano particle shaping and coating equipment can be the micro-nano particle shaping and coating equipment shown in fig. 1, the arrow direction in the figure is the flow direction of the premix, namely, the premix is fed from a feeding port 3, and then is circulated to a cavity provided with rotor blades 6 through a circulation channel 5 for micro-nano particle shaping and coating, and then is discharged through a discharging port 4, of course, commercially available micro-nano particle shaping and coating equipment can be used, and the invention is not limited to the structure of the micro-nano particle shaping and coating equipment shown in fig.. And then preparing spherical or nearly spherical composite particles with a core 1-shell 2 structure through a micro-nano particle shaping and coating process. The structure of the composite particles is shown in fig. 2.
In a further preferred embodiment, the rotation speed of the micro-nano particle shaping and coating device in the treatment process in the step 3) can be selected to be 2000-8000r/min, the treatment time in the micro-nano particle shaping and coating device can be selected to be 5-30min, and the discharge time after treatment can be selected to be 2-5 min.
Certainly, according to the size of the equipment, the amount of the raw materials and other factors, the amount of the premix placed in the micro-nano particle shaping and coating equipment each time can be adjusted according to the actual situation, for example, the amount of the premix in the step 3) each time is 0.5-5 kg. Of course, each dosage herein refers to the dosage each time the dosage is placed in the device, different devices may make different selections of dosages, and the invention is not limited thereto.
In a further preferred embodiment, in step 4), the resin-based abrasive tool is prepared by placing the prepared composite particles in a mold, pressing the composite particles, and hardening the composite particles. Of course, the pressing and hardening process herein is performed in a conventional manner in the art, for example, the pressing may be performed by pressing the composite particles placed in the mold at a certain temperature (e.g., 80-250 ℃) under a certain pressure (e.g., 0.5-10MPa), and the hardening may be performed by curing in an oven at a certain temperature (e.g., 400-. The pressing and hardening are all means that can be understood and used by those skilled in the art, and are not described in detail herein.
The invention also provides a resin-based grinding tool prepared by the preparation method.
The present invention will be described in detail below by way of examples.
Example 1
Firstly, 200g of 2000-mesh diamond powder and 20g of dispersing agent are put into a high-speed stirrer at 80 ℃ to be mixed for 5min to prepare pre-dispersed particles, and then the pre-dispersed particles, 40g of 1000-mesh copper powder, 800g of phenolic resin particles and 600g of polyimide resin particles are premixed for 5min at 1480r/min by using the high-speed mixer to prepare a premix; then 1500g of premix is put into micro-nano particle shaping and coating equipment, and is treated (namely reacted) for 10min at the rotating speed of 3000r/min, and the composite particles are prepared after discharging for 3 min; then the composite particles are molded under the conditions that the temperature is 80 ℃ and the pressure is 0.5MPa, and then hardened for 5 hours under the condition of 400 ℃ to prepare a resin-based grinding tool A1 with the thickness of 75 mm. Finally, the resin-based abrasive tool thus obtained was cut transversely, and no "undercooking" was found in the interior of the resin-based abrasive tool A1.
Example 2
Firstly, 200g of 2000-mesh diamond powder and 20g of dispersing agent are put into a high-speed stirrer at 80 ℃ to be mixed for 5min to prepare pre-dispersed particles, and then the pre-dispersed particles, 40g of 1000-mesh copper powder, 800g of phenolic resin particles and 600g of polyimide resin particles are premixed for 5min at 1480r/min by using the high-speed mixer to prepare a premix; then 1500g of premix is put into micro-nano particle shaping and coating equipment, the micro-nano particle shaping and coating equipment is treated for 10min at the rotating speed of 3000r/min, and the composite particles are prepared after discharging (namely discharging) for 3 min; then molding the composite particles at the temperature of 250 ℃ and the pressure of 10MPa, and then hardening the composite particles for 6 hours at the temperature of 450 ℃ to prepare a resin-based grinding tool A2 with the thickness of 90 mm. Finally, the resin-based abrasive tool thus obtained was cut transversely, and no "undercooking" was found in the interior of the resin-based abrasive tool A2.
Example 3
Firstly, 200g of 5000-mesh white corundum powder and 20g of dispersing agent are put into a high-speed stirrer at the temperature of 80 ℃ to be mixed for 5min to prepare pre-dispersed particles, and then the pre-dispersed particles, 40g of 1000-mesh aluminum powder, 800g of phenolic resin particles and 600g of polyimide resin particles are premixed for 5min at the speed of 1480r/min by using the high-speed stirrer to prepare a premix; then putting 1500g of premix into micro-nano particle shaping and coating equipment, processing for 15min at the rotating speed of 3000r/min, discharging for 5min, and preparing composite particles; then molding the composite particles at the temperature of 180 ℃ and the pressure of 5MPa, and then hardening the composite particles for 5 hours at the temperature of 420 ℃ to prepare the resin-based grinding tool A3 with the thickness of 90 mm. Finally, the obtained abrasive was cut transversely, and no "undercooking" was found in the interior of the resin-based abrasive A3.
Example 4
Preparation was carried out in accordance with the preparation method of example 1 except that 5g of the dispersant, 330g of the phenol resin, 270g of the polyimide resin, 10g of the copper powder and 500g of the premixed material were charged to obtain a resin-based abrasive tool A4. Finally, the obtained abrasive was cut transversely, and no "undercooking" was found in the interior of the resin-based abrasive A4.
Comparative example 1
The preparation was carried out in accordance with the preparation method of example 1 except that no copper powder was added to obtain a resin-based abrasive D1. Finally, the resultant abrasive was transversely cut to find that "undercooking" occurred inside the resin-based abrasive D1.
Comparative example 2
The preparation was carried out in accordance with the preparation method of example 2, except that the premix was directly subjected to press molding to obtain a resin-based abrasive D2. Finally, the resultant abrasive was transversely cut to find that "undercooking" occurred inside the resin-based abrasive D2.
Comparative example 3
The resin-based abrasive article is prepared according to conventional methods in the art for preparing resin-based abrasive articles, such as: 200g of 2000-mesh diamond powder, 20g of dispersing agent, 40g of 1000-mesh copper powder, 800g of phenolic resin particles and 600g of polyimide resin particles are mixed by a mixer for 48 hours; the mixed pellets were then subjected to molding hardening under the conditions in example 1 to obtain a resin-based grindstone D3 having a thickness of 75 mm. Finally, the resin-based abrasive D3 was cut transversely, and it was found that the raw material having a thickness of about 5mm was not hardened in the resin-based abrasive D3.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. A method of making a resin-based abrasive article, the method comprising:
1) pre-dispersing the abrasive material: mixing and dispersing the grinding material and the dispersing agent to prepare pre-dispersed particles;
2) preparation of premix: mixing the pre-dispersed particles prepared in the step 1), a resin material and an additive to prepare a premix;
3) coating the abrasive: shaping and coating the micro-nano particles of the premix prepared in the step 2) to prepare composite particles;
4) molding and hardening: pressing the composite particles prepared in the step 3), and hardening to prepare a resin-based grinding tool;
wherein, the step 3) is to process the prepared premix in micro-nano particle shaping and coating equipment to prepare spherical or nearly spherical composite particles with a core (1) -shell (2) structure;
the rotating speed of the micro-nano particle shaping and coating equipment in the treatment process in the step 3) is 2000-;
the dosage of the premix in the step 3) is 0.5-5 kg; wherein, relative to 100 parts by weight of the abrasive, the dosage of the dispersant is 10-30 parts by weight, the dosage of the resin material is 1200-1800 parts by weight, and the dosage of the additive is 20-60 parts by weight;
wherein the abrasive is selected from one or more of diamond powder, corundum powder, cubic boron nitride powder, nickel-plated corundum powder and silicon nitride powder; wherein the resin material is selected from the group consisting of phenolic resins and polyimide resins; wherein, based on the total weight of the resin material, the dosage of the phenolic resin is 55-60 wt%, and the dosage of the polyimide resin is 40-45 wt%; wherein the additive is selected from copper powder and/or aluminum powder.
2. The preparation method according to claim 1, wherein the step 1) comprises placing the abrasive and the dispersant in a high-speed mixer for mixing and dispersing, wherein the mixing and dispersing time is 2-10min, and the mixing and dispersing temperature is 70-90 ℃.
3. The method as claimed in claim 1, wherein the abrasive has a particle size of 325-10000 mesh.
4. The preparation method as claimed in claim 1, wherein the mixing in step 2) is carried out in a blender at a rotation speed of 1200-1700r/min for 5-30 min.
5. The method of claim 4, wherein the blender is selected from a high speed mixer.
6. The production method according to claim 1, wherein the particle size of the resin material is 50 to 800 mesh.
7. The method as claimed in claim 1, wherein the particle size of the additive is 325-5000 mesh.
8. The method according to claim 1, wherein the resin-based abrasive tool is prepared by pressing the prepared composite particles in a mold and hardening the pressed composite particles in step 4).
9. A resin-based abrasive tool made according to the method of any one of claims 1-8.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102245351A (en) * | 2008-12-22 | 2011-11-16 | 圣戈班磨料磨具有限公司 | Rigid or flexible, macro-porous abrasive article |
| CN103273417A (en) * | 2013-06-18 | 2013-09-04 | 山东泰广奕砂轮有限公司 | Diamond resin grinding plate and manufacturing method thereof |
| CN106737256A (en) * | 2017-03-17 | 2017-05-31 | 衢州学院 | A kind of Nano diamond grinding tool pellet preparation method of use wet mixing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100493780C (en) * | 2006-12-30 | 2009-06-03 | 江苏天一超细金属粉末有限公司 | Method and equipment for coating metal bond on abrasive particle |
| JP4883790B2 (en) * | 2007-04-03 | 2012-02-22 | 独立行政法人産業技術総合研究所 | Inorganic material-polymer resin composite granulated product and method for producing the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102245351A (en) * | 2008-12-22 | 2011-11-16 | 圣戈班磨料磨具有限公司 | Rigid or flexible, macro-porous abrasive article |
| CN103273417A (en) * | 2013-06-18 | 2013-09-04 | 山东泰广奕砂轮有限公司 | Diamond resin grinding plate and manufacturing method thereof |
| CN106737256A (en) * | 2017-03-17 | 2017-05-31 | 衢州学院 | A kind of Nano diamond grinding tool pellet preparation method of use wet mixing method |
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