CN112123224A - Matte grinding block and preparation method thereof - Google Patents
Matte grinding block and preparation method thereof Download PDFInfo
- Publication number
- CN112123224A CN112123224A CN202010777465.3A CN202010777465A CN112123224A CN 112123224 A CN112123224 A CN 112123224A CN 202010777465 A CN202010777465 A CN 202010777465A CN 112123224 A CN112123224 A CN 112123224A
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- parts
- matte
- mixed solution
- epoxy resin
- silicon carbide
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/346—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties utilised during polishing, or grinding operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a matte grinding block and a preparation method thereof, wherein the matte grinding block comprises the following components in parts by weight: 5-60 parts of epoxy resin; 1-40 parts of a curing agent; 0.2-3 parts of a coupling agent; 0.5-10 parts of white carbon black; 0.3-10 parts of polyvinyl butyral; 6-69 parts of silicon carbide; 1-9 parts of butadiene acrylonitrile rubber. According to the invention, the white carbon black, the polyvinyl butyral, the silicon carbide and the nitrile rubber are added on the basis of the epoxy resin, so that the prepared matte grinding block has good profiling performance and wear resistance, the conventional manufacturing mode is changed on the manufacturing method on the premise of good wear resistance, and the manufacturing method of casting, vacuumizing and pressurizing is adopted, so that the produced grinding block does not generate grinding marks, grinding flowers and other phenomena on the surface of a machined part, the surface of the obtained machined part has good matte effect, and the quality requirement of the market on the matte surface can be met.
Description
Technical Field
The invention relates to the technical field of floor tile surface polishing, in particular to a matte grinding block for matte polishing of floor tiles and wall tiles.
Background
The gloss of a tile can be generally distinguished according to its reflection of light at a specific angle, and can be generally classified from low to high as: matte, soft, mercerized, semi-glossy, high gloss, and the like. Matte is a relatively bright light, and means a flat surface, and a surface is subjected to a less polishing treatment with a resin abrasive or the like, and has a lower light intensity than the polished surface, and has a certain light intensity, but the light is less reflected, and the surface is flat and smooth, but the light intensity is low.
At present, the quality of the produced floor tiles is finally measured by the mirror polishing effect. To obtain a floor tile with a good matte or soft-light effect, a grinding brush or a resin matte module is generally used. The grinding brush is easy to generate grinding marks and grinding patterns on the surface of the workpiece, so that the surface of the obtained workpiece is rough. The resin matte module generally comprises a plastic clamping seat and a resin grinding block containing grinding materials, the profiling capability of the resin matte module is poor due to the limitation of materials, and the surface of an obtained workpiece cannot meet the quality requirement of the market on the matte surface after the workpiece is machined.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the matte grinding block which solves the traditional problems, has good profiling capability, does not generate grinding marks, grinding flowers and other phenomena on the surface of a machined part on the premise of better wear resistance performance, has better matte effect on the surface of the machined part, and can meet the quality requirement of the market on the matte surface.
The invention also provides a preparation method of the matte grinding block.
The invention is realized by adopting the following technical scheme:
the matte grinding block comprises the following components in parts by weight:
5-60 parts of epoxy resin; 1-40 parts of a curing agent; 0.2-3 parts of a coupling agent; 0.5-10 parts of white carbon black; 0.3-10 parts of polyvinyl butyral; 6-69 parts of silicon carbide; 1-9 parts of butadiene acrylonitrile rubber.
Further, the matte grinding block comprises the following components in parts by weight:
5-60 parts of epoxy resin; 1-25 parts of a curing agent; 0.2-3 parts of a coupling agent; 0.5-8 parts of white carbon black; 0.3-10 parts of polyvinyl butyral; 8-69 parts of silicon carbide; 1-8 parts of butadiene acrylonitrile rubber.
Further, the epoxy resin is epoxy resin E44; the curing agent is 593; the coupling agent is a coupling agent 560.
Further, the mesh number of the silicon carbide is 180 meshes.
Further, the mass ratio of the epoxy resin to the coupling agent to the white carbon black is 35:0.2-1: 5-10.
Further, the mass ratio of the polyvinyl butyral to the curing agent is 3.5: 25-28.
Further, the mass ratio of the nitrile rubber to the silicon carbide and the polyvinyl butyral is 3-9: 6: 3.5-5.
The invention also provides a preparation method of the matte grinding block, which comprises the following preparation steps:
s1: weighing the components according to the formula for later use;
s2: mixing epoxy resin and a coupling agent, and uniformly stirring to obtain a first mixed solution;
s3: adding white carbon black into the first mixed solution, and uniformly stirring to obtain a second mixed solution;
s4: sequentially adding polyvinyl butyral and butadiene-acrylonitrile rubber into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
s5: and sequentially adding silicon carbide and a curing agent into the third mixed solution, quickly and fully stirring uniformly, then quickly pouring into a mold, flattening by using a press, taking out from the mold after curing, putting into a drying box at the temperature of 80-90 ℃, preserving heat for 4-5 h, taking out, pasting, packaging and warehousing.
Further, the pressure of the press is 20 MPa.
Further, the preparation method of the matte grinding block comprises the following preparation steps:
s1: weighing the components according to the formula for later use;
s2: mixing epoxy resin and a coupling agent, and uniformly stirring to obtain a first mixed solution;
s3: adding white carbon black into the first mixed solution, and uniformly stirring to obtain a second mixed solution;
s4: sequentially adding polyvinyl butyral and butadiene-acrylonitrile rubber into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
s5: and sequentially adding silicon carbide and a curing agent into the third mixed solution, quickly and fully stirring uniformly, then quickly pouring into a mold, flattening by using a press, taking out the mold after curing, putting into a drying box at 80 ℃, preserving heat for 4 hours, taking out, pasting, packaging and warehousing.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the white carbon black, the polyvinyl butyral, the silicon carbide and the nitrile rubber are added on the basis of the epoxy resin, so that the prepared matte grinding block has good profiling performance and wear resistance, the conventional manufacturing mode is changed on the manufacturing method on the premise of good wear resistance, and the manufacturing method of casting, vacuumizing and pressurizing is adopted, so that the produced grinding block does not generate grinding marks, grinding flowers and other phenomena on the surface of a machined part, the surface of the obtained machined part has good matte effect, and the quality requirement of the market on the matte surface can be met.
The invention has simple production operation, saves the field, requires less manpower, can effectively reduce the operation and management cost, is not easy to burn, has no dust pollution, and belongs to an environment-friendly product.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
The invention provides a matte grinding block which comprises the following components in parts by weight:
5-60 parts of epoxy resin; 1-40 parts of a curing agent; 0.2-3 parts of a coupling agent; 0.5-10 parts of white carbon black; 0.3-10 parts of polyvinyl butyral; 6-69 parts of silicon carbide; 1-9 parts of butadiene acrylonitrile rubber.
The white carbon black is a porous substance and has the characteristics of high temperature resistance, good adhesion, tear resistance, non-flammability, tasteless and the like, and the characteristics of serious coordination deficiency, huge specific surface area, surface oxygen deficiency and the like on the surface of the white carbon black enable the white carbon black to show extremely strong activity, easily play a bonding role with oxygen of epoxy cyclic molecules in epoxy resin, improve the intermolecular bond force, and simultaneously still have a part of white carbon black particles still distributed in gaps of a polymer chain, so that the strength, the toughness and the ductility of the epoxy resin material are greatly improved. In one embodiment, the white carbon black is one or a combination of precipitated silica and fumed silica, and the particle size of the white carbon black is 50nm-80 nm.
The polyvinyl butyral is a condensate of polyvinyl alcohol and butyraldehyde, has long branched chains in molecules, has the advantages of excellent transparency, light resistance, heat resistance, cold resistance, good film forming property, high tensile strength, impact resistance and the like, and can increase the flexibility by adding the polyvinyl butyral into epoxy resin.
The silicon carbide has the characteristics of stable chemical property, high heat conductivity coefficient, small thermal expansion coefficient, good wear resistance and the like.
The nitrile butadiene rubber has good oil resistance, flexibility resistance and higher bonding strength, and has good intermiscibility with epoxy resin, active functional groups of the nitrile butadiene rubber are distributed at two ends of a molecular chain, and carboxyl can react with epoxy groups in the epoxy resin under the action of a curing agent, so that a nitrile butadiene polymer chain segment is embedded in a cross-linked structure of the epoxy resin, and a good toughening effect can be achieved.
Further, the matte grinding block comprises the following components in parts by weight:
5-60 parts of epoxy resin; 1-25 parts of a curing agent; 0.2-3 parts of a coupling agent; 0.5-8 parts of white carbon black; 0.3-10 parts of polyvinyl butyral; 8-69 parts of silicon carbide; 1-8 parts of butadiene acrylonitrile rubber.
Further, the epoxy resin is epoxy resin E44; the curing agent is 593; the coupling agent is a coupling agent 560.
The epoxy resin E44 is an organic polymer compound having two or more epoxy groups in its molecule, and its relative molecular mass is not high except individually. The molecular structure of the epoxy resin is characterized in that a molecular chain contains active epoxy groups, and the epoxy groups can be positioned at the tail ends, in the middle or in a ring structure. Because the molecular structure of the epoxy resin E44 contains active epoxy groups, the epoxy resin E44 can generate cross-linking reaction with various curing agents to form insoluble and infusible high polymer with a three-dimensional network structure. The adhesive has good fluidity, easy mixing with auxiliary materials, convenient molding and processing, good dimensional stability after curing, shrinkage rate less than 2 percent, thermal expansion coefficient of 6-10.5 percent, excellent adhesive property, good electrical insulation property, mechanical property and chemical stability. In one embodiment, the epoxy resin E44 is synthesized by epichlorohydrin and bisphenol A, and the epoxy value is 0.41-0.47 eq/100 g.
The curing agent 593 is an adduct of diethylenetriamine and butyl glycidyl ether, has a molecular weight of 217.13 and a relative density of 0.985, and can be cured with epoxy resin at room temperature due to the primary amine and secondary amine groups in the structure.
The chemical name of the coupling agent 560 is gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, and the chemical structural formula is CH2-CHCH2-O(CH2)3Si(OCH3)3。
Further, the mesh number of the silicon carbide is 180 meshes. The mass ratio of the epoxy resin to the coupling agent to the white carbon black is 35:0.2-1: 5-10. The mass ratio of the polyvinyl butyral to the curing agent is 3.5: 25-28. The mass ratio of the nitrile rubber to the silicon carbide to the polyvinyl butyral is 3-9: 6: 3.5-5.
The invention also provides a preparation method of the matte grinding block, which comprises the following preparation steps:
s1: weighing the components according to the formula for later use;
s2: mixing epoxy resin and a coupling agent, and uniformly stirring to obtain a first mixed solution;
s3: adding white carbon black into the first mixed solution, and uniformly stirring to obtain a second mixed solution;
s4: sequentially adding polyvinyl butyral and butadiene-acrylonitrile rubber into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
s5: and sequentially adding silicon carbide and a curing agent into the third mixed solution, quickly and fully stirring uniformly, then quickly pouring into a mold, flattening by using a press, taking out the mold after curing, putting into a drying oven at 80-90 ℃, preserving heat for 4-5 h, taking out, sticking, packaging and warehousing.
The following are specific examples of the present invention, and raw materials, equipment, and the like used in the following examples can be obtained by purchasing, unless otherwise specified.
Example 1:
the matte grinding block comprises the following components in parts by weight:
5 parts of epoxy resin; 1 part of a curing agent; 0.2 part of a coupling agent; 0.5 part of white carbon black; 0.3 part of polyvinyl butyral; 6 parts of silicon carbide; 1 part of butadiene acrylonitrile rubber.
The preparation method of the matte grinding block comprises the following preparation steps:
s1: weighing the components according to the formula for later use;
s2: mixing epoxy resin and a coupling agent, and uniformly stirring to obtain a first mixed solution;
s3: adding white carbon black into the first mixed solution, and uniformly stirring to obtain a second mixed solution;
s4: sequentially adding polyvinyl butyral and butadiene-acrylonitrile rubber into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
s5: and sequentially adding silicon carbide and a curing agent into the third mixed solution, quickly and fully stirring uniformly, then quickly pouring into a mold, flattening by using a press, taking out the mold after curing, putting into a drying box at 80 ℃, preserving heat for 4 hours, taking out, pasting, packaging and warehousing.
Example 2:
different from the embodiment 1, the matte grinding block of the embodiment 2 comprises the following components in parts by weight:
32 parts of epoxy resin; 20 parts of a curing agent; 1.5 parts of a coupling agent; 5 parts of white carbon black; 5 parts of polyvinyl butyral; 40 parts of silicon carbide; 6 parts of butadiene acrylonitrile rubber.
Example 3:
unlike example 1, the matte abrasive brick of example 3 comprises the following components in parts by weight:
60 parts of epoxy resin; 40 parts of a curing agent; 3 parts of a coupling agent; 10 parts of white carbon black; 10 parts of polyvinyl butyral; 69 parts of silicon carbide; 9 parts of butadiene acrylonitrile rubber.
Example 4:
unlike example 1, the matte abrasive brick of example 4 comprises the following components in parts by weight:
60 parts of epoxy resin; 25 parts of a curing agent; 3 parts of a coupling agent; 8 parts of white carbon black; 10 parts of polyvinyl butyral; 69 parts of silicon carbide; 8 parts of butadiene acrylonitrile rubber.
Example 5:
unlike example 1, the matte abrasive brick of example 5 includes the following components in parts by weight:
35 parts of epoxy resin; 25 parts of a curing agent; 1 part of a coupling agent; 10 parts of white carbon black; 3.5 parts of polyvinyl butyral; 6 parts of silicon carbide; 3 parts of butadiene acrylonitrile rubber.
Example 6:
unlike example 1, the matte abrasive block of example 6 includes the following components in parts by weight:
33.5 parts of epoxy resin; 28 parts of a curing agent; 1 part of a coupling agent; 9 parts of white carbon black; 3.5 parts of polyvinyl butyral; 6 parts of silicon carbide; 5 parts of butadiene acrylonitrile rubber.
Example 7:
unlike example 1, the matte abrasive brick of example 7 includes the following components in parts by weight:
29 parts of epoxy resin; 35 parts of a curing agent; 1 part of a coupling agent; 5.5 parts of white carbon black; 3.5 parts of polyvinyl butyral; 6 parts of silicon carbide; 9 parts of butadiene acrylonitrile rubber.
In the above embodiments, the white carbon black is precipitated silica, the particle size of the white carbon black is 60nm, the epoxy resin is epoxy resin E44, the curing agent is 593, the coupling agent is coupling agent 560, the mesh number of the silicon carbide is 180 meshes, each material is not limited to the above-mentioned components, each material may also be composed of other single components or multiple components described in the present invention, and the component parts of each material are not limited to the above parts, and the component parts of each material may also be a combination of other component parts described in the present invention, which is not described herein again.
Comparative example 1:
comparative example 1 is a matte abrasive block which differs from example 5 in that no nitrile rubber was used in the raw material of comparative example 1.
Comparative example 2:
comparative example 2 is a matte grind block which differs from example 5 in that the starting material of comparative example 2 does not use polyvinyl butyral.
The test method comprises the following steps:
1. hardness: the shore D hardness was used for testing.
2. Grinding force: and (3) respectively and uniformly taking 20 points on the surface of the floor tile by using a thickness tester, calculating an average value, and calculating a thickness difference value before and after grinding to obtain the grinding force, wherein the thickness of the floor tile is 1.2 mm.
3. Service life: the floor tile was polished 2000 times using a polishing block, and the thickness a of the floor tile before polishing was measured with a vernier caliper, and the lifetime was obtained as the consumed thickness B, (2000/B) × a, where the thickness of the floor tile was 1.2 mm.
4. Appearance of the floor tile: and observing the scratching degree of the product.
5. The matte condition is as follows: the surface of the ground floor tile was measured with a three-angle gloss meter (85 ° angle was selected).
6. The product performance was tested as in table 1 below:
TABLE 1
As can be seen from table 1, compared with comparative examples 1 and 2, the abrasive block of the present invention has better wear resistance, no wear marks, and other phenomena on the surface of the workpiece, and the obtained surface of the workpiece has better matte effect, wherein the matte effect of example 5 is the best.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. The matte grinding block is characterized by comprising the following components in parts by weight:
5-60 parts of epoxy resin; 1-40 parts of a curing agent; 0.2-3 parts of a coupling agent; 0.5-10 parts of white carbon black; 0.3-10 parts of polyvinyl butyral; 6-69 parts of silicon carbide; 1-9 parts of butadiene acrylonitrile rubber.
2. The matte grinding block according to claim 1, which comprises the following components in parts by weight:
5-60 parts of epoxy resin; 1-25 parts of a curing agent; 0.2-3 parts of a coupling agent; 0.5-8 parts of white carbon black; 0.3-10 parts of polyvinyl butyral; 8-69 parts of silicon carbide; 1-8 parts of butadiene acrylonitrile rubber.
3. The matte abrasive block according to claim 1, wherein the epoxy resin is epoxy resin E44; the curing agent is 593; the coupling agent is a coupling agent 560.
4. The matte abrasive segment of claim 1, wherein the silicon carbide has a mesh size of 180 mesh.
5. The matte grinding block according to claim 1, wherein the mass ratio of the epoxy resin to the coupling agent to the white carbon black is 35:0.2-1: 5-10.
6. The matte abrasive block of claim 1, wherein the mass ratio of the polyvinyl butyral to the curing agent is 3.5: 25-28.
7. The matte abrasive block according to claim 1, wherein the mass ratio of the nitrile rubber to the silicon carbide and polyvinyl butyral is 3-9: 6: 3.5-5.
8. The preparation method of the matte grinding block is characterized by comprising the following preparation steps:
s1: weighing the components according to the formula for later use;
s2: mixing epoxy resin and a coupling agent, and uniformly stirring to obtain a first mixed solution;
s3: adding white carbon black into the first mixed solution, and uniformly stirring to obtain a second mixed solution;
s4: sequentially adding polyvinyl butyral and butadiene-acrylonitrile rubber into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
s5: and sequentially adding silicon carbide and a curing agent into the third mixed solution, quickly and fully stirring uniformly, then quickly pouring into a mold, flattening by using a press, taking out from the mold after curing, putting into a drying box at the temperature of 80-90 ℃, preserving heat for 4-5 h, taking out, pasting, packaging and warehousing.
9. The method of claim 8, wherein the press pressure is 20 MPa.
10. The method of making a matte abrasive block according to claim 8, comprising the steps of:
s1: weighing the components according to the formula for later use;
s2: mixing epoxy resin and a coupling agent, and uniformly stirring to obtain a first mixed solution;
s3: adding white carbon black into the first mixed solution, and uniformly stirring to obtain a second mixed solution;
s4: sequentially adding polyvinyl butyral and butadiene-acrylonitrile rubber into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
s5: and sequentially adding silicon carbide and a curing agent into the third mixed solution, quickly and fully stirring uniformly, then quickly pouring into a mold, flattening by using a press, taking out the mold after curing, putting into a drying box at 80 ℃, preserving heat for 4 hours, taking out, pasting, packaging and warehousing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010777465.3A CN112123224A (en) | 2020-08-05 | 2020-08-05 | Matte grinding block and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010777465.3A CN112123224A (en) | 2020-08-05 | 2020-08-05 | Matte grinding block and preparation method thereof |
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| CN112123224A true CN112123224A (en) | 2020-12-25 |
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| CN202010777465.3A Pending CN112123224A (en) | 2020-08-05 | 2020-08-05 | Matte grinding block and preparation method thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB779358A (en) * | 1953-07-02 | 1957-07-17 | Bay State Abrasive Products Co | Flexible abrasive product |
| US5556437A (en) * | 1990-11-14 | 1996-09-17 | Minnesota Mining And Manufacturing Company | Coated abrasive having an overcoating of an epoxy resin coatable from water |
| US6132860A (en) * | 1992-05-21 | 2000-10-17 | 3M Innovative Properties Company | Abrasive article comprising organometallic coupling agent |
| CN101214637A (en) * | 2008-01-16 | 2008-07-09 | 郑州安华磨具有限公司 | Glass edging wheel |
| CN103396041A (en) * | 2013-07-24 | 2013-11-20 | 田辉明 | Artificial high-purity quartz stone runner wheel and grinding base and preparation method thereof |
| CN103753412A (en) * | 2014-01-23 | 2014-04-30 | 泉州市易光石材工具有限公司 | Nylon grinding block formula |
| CN105171625A (en) * | 2015-10-31 | 2015-12-23 | 赵雪雅 | Silica gel base material, silica gel tile abrading block and preparation method of silica gel tile abrading block |
| CN109159039A (en) * | 2018-09-06 | 2019-01-08 | 扬中市飞宇磨具有限公司 | A kind of blade tool processing grinding abrasive disk |
-
2020
- 2020-08-05 CN CN202010777465.3A patent/CN112123224A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB779358A (en) * | 1953-07-02 | 1957-07-17 | Bay State Abrasive Products Co | Flexible abrasive product |
| US5556437A (en) * | 1990-11-14 | 1996-09-17 | Minnesota Mining And Manufacturing Company | Coated abrasive having an overcoating of an epoxy resin coatable from water |
| US6132860A (en) * | 1992-05-21 | 2000-10-17 | 3M Innovative Properties Company | Abrasive article comprising organometallic coupling agent |
| CN101214637A (en) * | 2008-01-16 | 2008-07-09 | 郑州安华磨具有限公司 | Glass edging wheel |
| CN103396041A (en) * | 2013-07-24 | 2013-11-20 | 田辉明 | Artificial high-purity quartz stone runner wheel and grinding base and preparation method thereof |
| CN103753412A (en) * | 2014-01-23 | 2014-04-30 | 泉州市易光石材工具有限公司 | Nylon grinding block formula |
| CN105171625A (en) * | 2015-10-31 | 2015-12-23 | 赵雪雅 | Silica gel base material, silica gel tile abrading block and preparation method of silica gel tile abrading block |
| CN109159039A (en) * | 2018-09-06 | 2019-01-08 | 扬中市飞宇磨具有限公司 | A kind of blade tool processing grinding abrasive disk |
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