MXPA00010992A - Abrasive grinding tools with hydrated and nonhalogenated inorganic grinding aids - Google Patents

Abstract

A bonded-abrasive tool includes a matrix of an organic bond, abrasive grains dispersed in the organic bond and a grinding aid in the form of either an inorganic nonhalogenated filler or a hydrated filler. The inorganic nonhalogenated filler can react with free radicals released from the organic bond during grinding. The hydrated filler endothermically releases water. A coated-abrasive tool includes a flexible substrate, abrasive grains bonded to the flexible substrate, and an organic bond containing a grinding aid including an inorganic nonhalogenated filler or a hydrated filler coated on the substrate.

Description

ABRASIVE TOOLS FOR GRINDING WITH INJERGANIC AND HYDRAULIC GRINDING AUXILIARIES DESCRIPTIVE MEMORY Tools used for grinding often include abrasive grains bonded to or to a polymer. Typically, such tools are in the form of bonded composite bodies, or flexible substrates coated with abrasive compositions. In both cases, however, the wear of the grinding tools is determined by several factors including, for example, the material being ground, the force applied to the grinding surface, the wear rate of the abrasive grains, and the physical and chemical properties of the polymer used to agglutinate the abrasive grains. The grinding efficiency in a bonded composite body is affected by the speed at which the bonded polymer wears, decomposes, liquefies or otherwise is lost. For example, if the bound polymer is lost too quickly, the abrasive grains will be thrown out before they wear out enough to deplete their ability to effectively grind. On the other hand, if the bonded polymer does not wear out quickly enough, the abrasive grains will be retained on the surface of the grinding tool beyond its useful life, thus avoiding new grains Both effects may limit overall grinding efficiency, and several methods have been used to increase the service life of grinding tools and their efficiency, one of which has been to use an "auxiliary" method. Grinding Examples. "Examples of abrasive grinding tool assistants with coating are given in US-A-5, 702, 811 and US-A-5, 203, 884. An example of a tool auxiliary for abrasive grinding with binder for the surface of a abrasive disc is given in SU-A-1653940. There are many types of grinding aids, and it is believed that they operate by different mechanisms.According to a proposed mechanism, the grinding temperature is reduced by reducing friction through the use of a auxiliary for grinding that melts or liquefies during the grinding operation, thus lubricating the grinding surface.In a second mechanism, the grinding assistant reacts with n the metal workpiece by corroding freshly cut pieces of metal, or iron filings, thus avoiding the reaction of the pieces with the abrasion or resolving of the pieces to the metal base. In a third proposed mechanism, the grinding aid reacts with the ground metal surface to form a lubricant. A fourth proposed mechanism includes the reaction of the grinding aid with the surface of the workpiece to promote cracking by stress-corrosion, thereby facilitating the removal of matter. The invention relates generally to abrasive tools.

In one embodiment, the abrasive tool of the invention is an abrasive tool with binder that includes a matrix of an organic binder, abrasive grains dispersed in the organic binder, and a non-halogenated inorganic filler that can react with free radicals formed from the binder. organic during grinding. In another embodiment, the abrasive tool of the invention is an abrasive tool with binder that includes an organic binder, abrasive grains dispersed in the organic binder, and a filler hydrated in the organic binder. In yet another embodiment, the abrasive tool of the invention is a coated abrasive tool that includes a flexible substrate, abrasive grains on the substrate, and an organic binder containing sodium antimonate or antimony oxide on the flexible substrate. In yet another embodiment, the abrasive tool of the invention is a coated abrasive tool that includes a flexible substrate, abrasive grains on the flexible substrate, and an organic binder containing a hydrated filler on the flexible substrate, in which the hydrated filler is selected from the following: calcium hydroxide, magnesium hydroxide, sodium hydrated silicate, alkali metal hydrates , nesquehonita, basic magnesium carbonate, magnesium carbonate sub-hydrate and zinc borate. The present invention has many advantages. For example, one embodiment of an abrasive tool of the present invention that includes ^^ • i ^ ÜÜBriiia a hydrated filler as a grinding aid significantly reduces the high temperatures produced by friction. It is believed that the hydrated filler limits the rise in temperature during grinding by releasing water endothermally, thereby slowing the loss of the binder. In an abrasive tool of the invention that includes a non-halogenated inorganic filler, the non-halogenated inorganic filler reduces the degradation of the binder by reacting with free radicals released from the binder during grinding. The fillers incorporated in the abrasive tools of this invention can reduce the likelihood of thermal degradation in the form of flame retardants. All these mechanisms can significantly increase the useful life and efficiency of bonded and coated abrasive tools. In addition, the grinding aids included in the abrasive tools of this invention, unlike many grinding aids, will not release potentially harmful halogens during grinding. The features and other details of the method of the invention will now be described more particularly. It will be understood that the particular embodiments of the invention are shown by way of illustration and not as limitations of the invention. The main features of this invention can be used in various embodiments without departing from the scope of the invention. An abrasive tool of this invention includes an organic binder, abrasive grains and a grinding aid that includes M ^^ É ^ ÉMaMi ^^^ mMfaM ^ ídfcM ^^ É ^ M ^^^ - MMiMM-- ii l ii i ii i n i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i ii ii Ii Ii i i n a filler hydrated and / or a non-halogenated inorganic filler, in which the grinding aid advantageously alters the thermal and / or mechanical degradation of the organic binder during grinding. In a preferred example, the abrasive tool is a grinding wheel bonded with resin. The organic binder of the abrasive tool is suitable for use as a matrix material of a grinding wheel, with abrasive grains dispersed therethrough. An example of a suitable organic binder is a thermofixing resin. Preferably, the thermosetting resin is either an epoxy resin or a phenolic resin. Specific examples of suitable thermosetting resins include phenolic resins (for example novolak and resole), epoxy, unsaturated polyester, bismaleimide, polyimide. cyanate ester, etc. Typically, the volume of the organic binder is between 2% and about 64% of the abrasive composition for grinding of a binder abrasive tool, in which the abrasive grinding composition is defined as the binder, abrasive grains, fillers in the binder and porosity in the binder. Preferably, the volume of organic binder in a grinding abrasive composition of a binder abrasive tool of this invention is on a scale of between 20% and 60%, and more preferably about 30-42%. . ,. t m. ~ + .. . . > . -. ".. , - ^. . u a ^., ..

In a typical coated abrasive tool suitable for use with the present invention, the abrasive grinding composition is applied to a flexible substrate of, for example, paper, film, or woven or stitched cloth. A resinous binder, also known as a coater, is applied to the flexible substrate. The abrasive grains are then applied to the complementation coating by electrostatic techniques or by a simple gravity feed and secured in the complementation coating with a phenolic size coating. Optionally, a coating of super sizing can be applied over the sizing coating. Grinding aids are typically included in the sizing or super sizing coating. Each of the coatings can be applied in a polymeric carrier of, for example, acrylic polymer. After each application, the tool is cured, typically at approximately 107 ° C.

Further descriptions of abrasive tools with coating suitable for application of the present invention are provided in the patents of E.U.A. Nos. 5,185,012, 5,163,976, 5,578,343 and 5,221, 295, the teachings of all of which are incorporated herein by reference in their entirety. In a preferred embodiment, the binder, or coating suitable complementer of a coated abrasive tool is Ebecryl ™ 3605 (a reaction product of diepoxylated bisphenol A and acrylic acid in a molar ratio of one to one, available from UCB Chemicals).

It has a mass, expressed as a substrate surface area function, of 30 g / m2 in a preferred embodiment. The abrasive grains of the abrasive tool are generally suitable for grinding metal, or in some cases, ceramic workpieces. Examples of suitable abrasive grains are those formed of aluminum oxide, diamond, cubic boron nitride, silicon carbide, etc. In general, the size of the abrasive grains in the abrasive tool of the invention is on a scale between about 4 grains and 240 grains (6,848-63 microns), preferably 4 to 80 grains (6,848-266 microns). Aluminum oxide grains with a grain size on a scale between 16 and about 20 grains (1, 660-1, 340 microns) are particularly suitable. The volume of abrasive grains in the abrasive grinding composition of a binder abrasive tool typically ranges from 34% to about 56% of the abrasive grinding composition. Preferably, in a wheel with binder, the volume of abrasive grains is on a scale between 40% and about 52%. In one embodiment of a coated abrasive tool, the abrasive grains are 0.086 mm (180-grain) silicon carbide and the mass of abrasive grains, expressed as a function of substrate surface area, is 188 g / m2. The abrasive grinding composition of an abrasive binder tool is typically porous. The porosity, or vacuum fraction, of the abrasive grinding composition typically is on a scale of up to 52% of the volume of the abrasive grinding composition. Preferably, the vacuum fraction is up to 26% of the total volume of the abrasive grinding composition. The grinding aid of an abrasive tool of this invention includes a hydrated filler and / or a non-halogenated inorganic filler. Suitable hydrated fillers are those that dehydrate to release water during the abrasive grinding of a metal workpiece. Examples of suitable hydrated fillers include zinc borate, available as Firebrake ™ ZB (2ZnO 3B2O3 3.5H2O: dehydrated at 293 ° C) or Firebrake ™ 415 (4ZnO B2O3 H2O: dehydrated at 415 ° C) from U.S. Borax; aluminum trihydrate (AI (OH) 3, available as Hydral ™ 710 or PGA-SD ™ from Alcoa); calcium hydroxide (Ca (OH) 2); magnesium hydroxide (Mg (OH) 2), available as FR-20 MHRM ™ 23-2 (treated with amino silane), FR-20 MHRM ™ 640 (with polyolefin coupling agent) or FR-20 MHRM ™ 120 ( with treated fat surface) from Ameribrom, Inc .; sodium hydrate silicate (Na2S.O3 9H20); alkali metal hydrates; nesquehonite (MgC03 Mg (OH) 2 3H20); Magnesium carbonate sub-hydrate (MgO CO2 (0.96) H20 (0.30)); etc. Specific hydrated fillers provide particularly preferred benefits. An especially preferred hydrated filler is zinc borate. The zinc borate is vitrified at 500-600 ° C and is believed to form a borate-type glass seal on the organic binder, thereby preventing thermal degradation of the organic binder. Another hydratao filler, aluminum trihydrate, is believed to form an aluminum oxide (AI2O3) with heating and dehydration. Aluminum oxide is a known abrasive material that can aid in the grinding process. Preferred hydrated fillers include aluminum trihydrate and 5-magnesium oxide. Another embodiment of the abrasive tool includes a non-halogenated inorganic filler that reduces the degradation of the organic binder during grinding. The phrase "reduces degradation", as used in the present, means that the non-halogenated inorganic filler acts to Conserve the organic binder by a different mechanism than simply increasing the ease with which the material is removed from the workpiece being ground, as is believed to occur by, for example, the use of iron disulfide (FeS2) as a grinding aid, in which iron disulfide promotes the removal of matter by oxidizing the surface of the work piece as well as pieces of it. Examples of suitable inorganic non-halogenated fillers include molybdenum oxide (VI) (Mo03, available from Aldrich), sodium antimonate (NaSb03 available as Thermoguard ™ FR from Elf Atochem), antimony oxide (Sb2O3, available as Thermoguard ™ S from Elf). Atochem), etc. In a In a preferred embodiment, the non-halogenated inorganic filler is antimony oxide. In yet another embodiment, the grinding aid includes inorganic and hydrated non-halogenated fillers. Either the assistant of ^ n ^ ^ Mi ^ aüik. frosted is a hydrated filler or a non-halogenated inorganic filler, the grinding aid in an abrasive tool with binder forms between 10% and 50% of the combined binder and fillers composition, by volume, whereby "fillers" includes active fillers , 5 pore inductors, lime for water absorption, etc., but no abrasive grains. Preferably, the grinding aid of an abrasive tool with binder forms between 20% and about 40% of the combined binder and fillers composition, by volume. More preferably, the grinding aid of an abrasive tool with binder forms approximately 25% of the combined binder and filler composition, by volume, although the ratio will vary depending on the degree and structure of the tool. Optionally, the abrasive tool further includes other fillers such as additional grinding aids (e.g., iron disulfide to react with the workpiece). work) and processing aids (eg, wetting agents). The components listed above may be combined in any order to form an abrasive tool of this invention. In a preferred embodiment of a binder abrasive tool, the abrasive grains are wetted with a liquid resin (eg, resin).

Grinding aids (hydrated or non-halogenated inorganic fillers), other fillers, and solid resin precursor to the organic binder (eg novolak), and a suitable catalyst (eg, hexamethylenetriamine) to cure the resins, combine to form a mixture. The wetted abrasive grains are agglutinated with the mixture to form a precursor composition. The precursor composition is then pressed into a mold and cured. Preferably, the composition is cured at a temperature on a scale between 130 C and 230 C. The abrasive grinding composition is then in the form of an abrasive tool for grinding or cutting, such as a binder abrasive wheel. Alternatively, the abrasive grinding composition is a component of an abrasive tool for grinding or cutting. Other methods for forming abrasive grinding or cutting tools of the invention may also be used. In one embodiment of a coated abrasive tool of this invention, an abrasive grinding composition includes a finishing coating, abrasive grains, a size coat, and, optionally, a super finish coating on the finishing coat. Grinding aids are typically included in the super sizing coating, where they are present, or in the sizing coating. In this embodiment, the grinding abrasive composition is applied to a flexible substrate, such as a sheet, band, disc, etc. Where a super sizing layer is present, including a binder and a grinding aid, the grinding aid preferably forms more than 50 wt.% combined solids of the binder and grinding aid. In another preferred embodiment, the grinding aid forms from 60 to about 80% by weight of the combined solids of the binder and grinding aid. The abrasive wheels with binder of the invention can be used in a variety of applications. Examples of such applications 5 include grinding of tracks, in which the railroad tracks are ground to remove roundness, and casting ground, in which cast metal articles in a foundry are ground to remove burrs and other casting defects. Other applications for abrasive wheels with binder of the invention include, but are not limited to, steel "cutting" and conditioning operations. The coated abrasive tools of the invention can be used, for example, in many industrial applications, such as metal finishing. When an abrasive wheel with binder is used to grind a work piece, such as a rail or casting article, the 15 abrasive grains on the surface of the organic binder grind the work piece by cutting, brushing or carving the surface of the binder. Workpiece. The friction produced by these grinding mechanisms generates considerable heat, which can increase the speed at which the organic binder decomposes, melts or wears out. As a result, the grinding surface of the organic binder is retracted, and the abrasive grains embedded within the organic binder matrix are exposed so that they increase until eventually they come off the abrasive tool. Fresh abrasive grains are exposed "* -" ^ * ^^ "». V -. - ... .. .... T.. ^^ .. ^ gradually with the removal of the surface of the organic binder to provide new sharp surfaces for The removal of the surface of the organic binder also releases other components, such as the non-halogenated inorganic and / or hydrated fillers used in an abrasive tool of the invention.The hydrated fillers in the abrasive tool release water during grinding. that the endothermic dehydration of the hydrated filler has a cooling effect on the grinding surfaces It is also believed that the water released by dehydration can act as a lubricant at the interface of the grinding tool and the work piece, and can absorb additional heat from the grinding surfaces by evaporation Inorganic non-halogenated fillers in an abrasive tool are believed to reduce the speed at which the binder orgas nico is lost from the grinding surface. A mechanism by which non-halogenated inorganic fillers, as used in the invention, is believed to reduce degradation, is to inhibit the chemical path by which an organic binder typically degrades. This chemical path generally includes the oxidation of a polymer chain of the organic binder during the grinding, which triggers the release of free radicals from the polymer chain. These free radicals then react with the organic binder at other points along the chain, causing the polymer to degrade further and release additional free radicals. The non-halogenated inorganic fillers are ^^? It is believed that they reduce the degradation of the organic binder by inhibiting the decomposition of the polymer chain caused by free radicals. It is believed that the non-halogenated inorganic filler, or degradation product of the non-halogenated inorganic filler, reduces the degradation of the organic binder by combining, such as by reaction, with free radicals released from the organic binder. Once combined with the non-halogenated inorganic filler or its degradation product, the radicals are not available to contribute to the degradation of the organic binder. The invention will be described further and more fully by the following examples.

EXAMPLE 1 A number of abrasive tools with binder of the invention, in the form of portable wheels for use in a portable grinder, were made to include one of several different inorganic non-halogenated fillers or hydrated fillers. In addition, a "standard" wheel (designated "1", below) was manufactured to serve as a control for reference when evaluating the wheel grinding performance of this invention. In each of the wheels of this invention (designated 2-7 below), the fillers were dispersed through the organic binder, forming approximately 25% of the combined binder / filler composition, by volume. The wheels that were made with those MAH MÉILÍÉÜB compositions were used to grind a 1026 carbon steel tube ring having an outer diameter of 30.5-cm, an inner diameter of 25.4-cm and a length of 15.2-cm. The grinding was done using a load of 6.8 kg, 9.1 kg and 11.3 kg. Each of the wheels had the following composition, with all the percentages calculated in volume and with "variable active filler" being varied for each wheel: fifteen twenty The "variable active filler" in each of the wheels, listed by number, immediately, was of the following respective composition: tfH | MartH | aÉH M (fa 1: Potassium sulfate (K2SO4, from Astro Chemicals, Inc., Springfield, MA) (density = 2.66 g / cc) 2: Aluminum trihydrate (AI (OH) 3, Hydral ™ 710 from Alcoa, Pittsburgh, PA) (density = 2.4 g / cc) 3: Calcium hydroxide (Ca (OH) 2, from Aldrich, Milwaukee, Wl) (density = 2.24 g / cc). 4: Molybdenum oxide (VI) (MoO3, from Aldrich, Millwaukee, Wl) (density = 4.69 g / cc). 5: Magnesium hydroxide (Mg (OH) 2, FR-20 MHRM 640 from Ameribrom, Inc., New York, NY) (density = 2.36 g / cc) 6: Zinc borate (4ZnO B2O3 H2O, Firebrake ™ 415 US Bórax, Valencia, CA) (density = 3.70 g / cc). 7: Antimony oxide (Sb2O3, Thermoguard ™ S by Elf Atochem, Philadelphia, PA) (density = 5.67 g / cc) c / Dechorane Plus ™ (the Diels-Alder diaduction of hexachlorocyclopentadiene and 1,5-cyclooctadiene, available from Occidental Chemical Corp., Niagara Falls, NY) (density - 1.9 g / cc) (1: 3 by volume). All wheels were tested for 18 minutes. Wheel performance results are shown in the following three boxes. As indicated in the tables, MRR represents the speed at which the metal is removed from the workpiece. WWR represents the wheel wear speed. The relation -g is the ratio of the volume of metal removed from the work piece to the volume of the wheel that wears out. Accordingly, a high ratio g means a high degree of wheel durability in relation to the amount of grinding that is performed and that is generally desired.

TABLE 1 (6.8 kq) TABLE 2 15 (9.1 kq) twenty e ^ & j ¿^? ^^? < ? i ^ to ^ A ^ TABLE 3 (11.3 kq) As can be seen, each of the non-halogenated inorganic hydrated fillers and fillers performed at a higher G-ratio than the standard (1) control wheel, at each of the three load levels. Wheel 6, which had zinc borate as an active filler, performed with the greatest grinding efficiency, as measured by the relation g, in each test.

EXAMPLE 2 In this example, the test was performed in the context of rail grinding, which is a more aggressive operation than the portable fixed head grinder used in example 1. In rail grinding, wheel life is a key factor in evaluating wheel performance. Again, the wheels of this invention, which include fillers, do not Inorganic halides as well as hydrated fillers were selected for the test. Each of the wheels in this experiment had the following basic composition, with all the percentages calculated in volume and with "variable active filler" being varied for each wheel: The "variable active filler" in each of the wheels, listed or number below, was of the following respective composition: 014-1: potassium sulfate (K2S0, from Astro Chemicals, Inc., Springfield, MA) (density = 2.66 g / cc). 014-2: Aluminum trihydrate (AI (OH) 3, Hydral ™ 710 from Alcoa, Pittsburgh, PA) (density = 2.4 g / cc) 5 014-3: Magnesium hydroxide (Mg (OH) 2, FR-20 MHRM 640 of Ameribrom, Inc., New York, NY) (density = 2.36 g / cc) 014-4: Calcium hydroxide (Ca (OH) 2, from Aldrich, Milwaukee, Wl) (density = 2.24 g / cc) 014-5 : Zinc Borate (4ZnO B2O3 H2O, Firebrake ™ 415 from US 10 Bórax, Valencia, CA) (density = 3.70 g / cc). Again, the wheel with potassium sulfate as the variable active filler (wheel 014-1) was used as a control during the test. As shown by the grinding data, which is presented in tables 4-6, the selected grinding aids increased the life of the wheels by as much as approximately 200% of the life of the control wheel. The specification with Al (OH) 3 did not show an increase in life, probably due to its relatively low dehydration temperature (approximately 200 ° C). The results of example 2 are provided in the following tables 4-6. Table 4 lists the results of tests carried out at the energy level of 23.1 kW and a grinding time of 5 minutes. Table 5 lists the results of tests performed at an energy level of 17.2 kW and a grinding time of 6 minutes. Table 6 lists the results of gH ^ tfÉag | Mtaß? ag tests performed at an energy level of 13.4 kW and a grinding time of 15 minutes. Each of the values, listed below, represents an average of results from two tests, performed on different wheels, of each specification.

TABLE 4 TABLE 5 twenty TABLE 6 EQUIVALENTS Although this invention has been shown in a particular manner and described with reference to preferred embodiments of the same, it will be understood by those skilled in the art that various changes in form and detail can be made thereto without departing from the scope of the invention as defined by the appended claims.

Claims (31)

NOVELTY OF THE INVENTION CLAIMS

1. An abrasive tool with binder, comprising: a) a matrix of an organic binder; b) abrasive grains dispersed in the organic binder; and c) Molybdenum oxide filler (VI) in the organic binder.

2. The abrasive tool with binder according to claim 1, further characterized in that the abrasive grains include a ceramic abrasive component.

3. The abrasive tool with binder according to claim 1, further characterized in that the organic binder includes a polymeric material.

4. The abrasive tool with binder according to claim 1, further characterized in that the organic binder includes a thermosetting resin.

5. The abrasive tool with binder according to claim 4, further characterized in that the organic binder 20 includes an epoxy resin.

6. The abrasive tool with binder according to claim 4, further characterized in that the organic binder includes a phenolic resin. «IUÉÜÍ ^ _ ^. M ^ MH * < i >

7. The abrasive tool with binder according to claim 1, further characterized in that the concentration of the filler is between 10% and 50% in volume, of the organic binder and filler.

8. The abrasive tool with binder according to claim 7, further characterized in that the concentration of the filler is between 20% and 40% by volume, organic binder and filler.

9. The abrasive tool with binder according to claim 1, further characterized in that the concentration of the organic binder is between 20% and 60% by volume, of a composition for abrasive grinding comprising the organic binder, the abrasive grains, filler in the binder, and porosity.

10. The abrasive tool with binder according to claim 1, further characterized in that the concentration of the organic binder is between 30% and 42%, by volume, of the abrasive composition for grinding.

11. The abrasive tool with binder according to claim 1, further characterized in that the abrasive grains are 6,848 mm (4 grains) to 0.063 mm (240 grains) in size.

12. The abrasive tool with binder according to claim 11, further characterized in that the abrasive grains are 6,848 mm (4 grains) to 0.266 mm (80 grains) in size.

13. The abrasive tool with binder according to claim 1, further characterized in that the concentration of the _... t t. üat-s .A.- ,. abrasive grains is between 34% and 56%, by volume, of an abrasive grinding composition, comprising organic binder, abrasive grains, fillers in the binder, and porosity.

14. The abrasive tool with binder according to claim 13, further characterized in that the concentration of the abrasive grains is between 40% and 52%, by volume, of the abrasive composition for grinding.

15. An abrasive tool with binder, comprising: a) a matrix of an organic binder; b) abrasive grains dispersed in the organic binder; and c) a hydrated filler in the organic binder, in which the hydrated filler is selected from the group consisting of aluminum trihydrate, calcium hydroxide, magnesium hydroxide, sodium hydrated silicate, alkali metal hydrates, neschedehyde, hydrated basic magnesium carbonate , magnesium carbonate sub-hydrate and zinc hydrate borate.

16. The abrasive tool with binder according to claim 15, further characterized in that the hydrated filler is zinc borate hydrate.

17. The abrasive tool with binder according to claim 15, further characterized in that the hydrated filler is aluminum trihydrate. t? ß? ^ - •• * - * 'a • - • •

18. The abrasive tool with binder according to claim 15, further characterized in that the hydrated filler is magnesium hydroxide.

19. The abrasive tool with binder according to claim 15, further characterized in that the abrasive grains include a ceramic abrasive component.

20. The abrasive tool with binder according to claim 15, further characterized in that the organic binder includes a polymeric material.

21. The abrasive tool with binder according to claim 15, further characterized in that the organic binder includes a thermosetting resin.

22. The abrasive tool with binder according to claim 15, further characterized in that the organic binder includes an epoxy resin.

23. The abrasive tool with binder according to claim 15, further characterized in that the organic binder includes a phenolic resin.

24. The abrasive tool with binder according to claim 15, further characterized in that the concentration of the hydrated filler is between 10% and 50% by volume, of the organic binder and filler. ii¿iui_ ^ i? a ??

25. - The abrasive tool with binder according to claim 24, further characterized in that the concentration of the hydrated filler is between 20% and 40% by volume, of the organic binder and filler.

The abrasive tool with binder according to claim 15, further characterized in that the concentration of the organic binder is between 20% and 60%, by volume, of the abrasive tool with binder.

27. The abrasive tool with binder according to claim 26, further characterized in that the concentration of the organic binder is between 30% and 42%, by volume, of the abrasive tool with binder.

28.- The abrasive tool with binder according to claim 15, further characterized in that the abrasive grains are of 6,848 mm (4 grains) and 0.063 mm (240 grains) in size.

29. The abrasive tool with binder according to claim 28, further characterized in that the abrasive grains are between 6,848 mm (4 grains) and 0.266 mm (80 grains) in size.

30.- The abrasive tool with binder in accordance with 20 claim 15, further characterized in that the concentration of the abrasive grains is between 34% and 56%, by volume, of a grinding abrasive composition, comprising the organic binder, the abrasive grains, fillers in the binder, and porosity .

31. - The abrasive tool with binder according to claim 30, further characterized in that the concentration of the abrasive grains is between 40% and 52%, by volume, of the abrasive composition for grinding. 5 32.- An abrasive tool with coating, comprising: a) a flexible substrate; b) abrasive grains bonded to the flexible substrate; c) an organic binder containing sodium antimonate, in which the organic binder is coated on the flexible substrate. 10 33.- An abrasive tool with coating, comprising: a) a flexible substrate; b) abrasive grains bonded to the flexible substrate; and c) an organic binder that contains a hydrated filler, in which the organic binder is coated on the flexible substrate, and in which the hydrated filler is selected from the group consisting of 15 of calcium hydroxide, magnesium hydroxide, hydrous sodium silicate, alkali metal hydrates, nesquehonite and zinc borate hydrate. 34. The abrasive tool with coating according to claim 33, further characterized in that the hydrate filler is zinc borate hydrate. 35.- The abrasive tool with coating according to claim 33, further characterized in that the hydrated filler is magnesium hydroxide.