EP0784528B1 - Articles abrasifs a lubrifiant encapsule - Google Patents

Articles abrasifs a lubrifiant encapsule Download PDF

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Publication number
EP0784528B1
EP0784528B1 EP95935734A EP95935734A EP0784528B1 EP 0784528 B1 EP0784528 B1 EP 0784528B1 EP 95935734 A EP95935734 A EP 95935734A EP 95935734 A EP95935734 A EP 95935734A EP 0784528 B1 EP0784528 B1 EP 0784528B1
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EP
European Patent Office
Prior art keywords
resin
abrasive article
abrasive
article according
capsules
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP95935734A
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German (de)
English (en)
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EP0784528A1 (fr
Inventor
Hironori Hagiwara
Ikuko Yamato
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3M Co
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Minnesota Mining and Manufacturing Co
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Publication of EP0784528A1 publication Critical patent/EP0784528A1/fr
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B24D11/001—Manufacture of flexible abrasive materials
    • B24D11/005—Making abrasive webs

Definitions

  • the present invention relates to abrasive articles.
  • the present invention relates to abrasive articles containing an encapsulated lubricant therein.
  • the treatment of surfaces in surface finishing operations can be accomplished using any of a variety of surface treating articles to accomplish the desired treatment.
  • the use of nonwoven articles in such applications is known.
  • a liquid or solid lubricant is applied to the nonwoven to improve the abrasive power of the article and to prevent "abrasive burning" or discoloration of the treated surface caused by the heat generated during the surface treating operation.
  • the application of lubricant to the nonwoven or to the surface can be accomplished in several ways. For example, a lubricant can be applied directly to the nonwoven or to the surface being treated at various intervals during the finishing operation.
  • a surface treating article comprising a nonwoven substrate having a source of lubricant incorporated within the substrate so that the lubricant will automatically become available during the use of the article in surface treating operations.
  • Japanese Patent Laid-Open Publication No. Sho 62-152679 discloses abrasive materials including a lubricant encapsulated in an envelope made of inorganic substances.
  • the disclosed envelope is porous with pore sizes of several tens to several hundred angstrom, so that a liquid lubricant may not be completely sealed in the capsule ("Recent Microcapsulation Technology" p. 131, edited by Integrated Technology Center).
  • Japanese Utility Model Laid-Open Publication Nos. Sho 63-32761 and 63-32762 disclose nonwoven abrasive materials including a lubricant encapsulated in an envelope of acrylic resin.
  • the acrylic resin has a low glass transition temperature, requiring the use of a crosslinking and shows poor sol vent and heat resistance because of a low crosslinking density. Consequently. the acrylic resin envelope may easily be dissolved by an organic solvent or melted by heat normally used in the manufacture of the nonwoven abrasive materials.
  • Japanese Utility Model Laid-Open Publication No. Sho 63-32763 discloses nonwoven abrasive materials with a lubricant encapsulated in glass capsules.
  • the glass capsules are produced by heat-fusing a glass at a temperature higher than its melting point, potentially causing the lubricant to decompose during the preparation of the capsules. Additionally, the use of glass presents a potential safety hazard.
  • United States Patent No. 3,502,453 discloses a resin-bonded wheel comprising thermosetting resin capsules containing a lubricant to reduce grinding friction.
  • the wheel is not suitable for precision abrasion operations because of its relative inflexibility. Additionally, the lubricant containing capsules may not break in a uniform manner, thereby lowering the efficacy of the lubricant in various applications.
  • United States Patent 3,431,689 discloses an abrasive article made of a lofty nonwoven web of nylon, abrasive grains, capsules of urethane resin containing a soap or a detergent).
  • German patent application 3 112 954 discloses an abrasive article comprising inter alia graphite powder encapsulated in phenol resin.
  • Such a deformable surface treating article comprises a nonwoven substrate with the aforementioned encapsulated lubricant affixed thereto wherein the lubricant is effective in preventing abrasive burning during use and wherein the article exhibits excellent abrasive power.
  • the present invention provides an abrasive article with an encapsulated lubricant.
  • the articles of the invention exhibit excellent abrasive power while avoiding abrasive burning during surface treating operations.
  • the invention provides an abrasive article, characterized by:
  • the fibers of the substrate preferably are staple fibers having a preferred length of about 10 to 50 mm and a denier within the range of 5 to 30.
  • the fibers may comprise any of a variety elastic, conformable and durable materials.
  • Preferred fibers comprise nylon 6,6.
  • the articles include an encapsulated lubricant wherein the lubricant is contained within a shell comprising a cured thermosetting resin.
  • the preferred resin is highly resistant to degradation by heat and by solvents and suitable resins may be selected from epoxy resins, urea resins, melamine resins, phenol resins and polyamide resins.
  • the resin is a urea or a melamine resin.
  • the capsules may also comprise an additional film layer surrounding the thermosetting resin to further enhance solvent and/or heat resistance.
  • the film comprises a metal or an oxide thereof wherein the metal may be copper, nickel, zinc, silver, lead or tin.
  • Thermosening resin means a polymeric resin capable of crosslinking.
  • Fibers refers to threadlike structures comprising the materials as set forth herein.
  • Staple fibers means fibers of a discrete length as further described herein.
  • “Lubricant capsule” refers to an encapsulated lubricant comprising a continuous shell of one or more polymeric materials as described herein and containing a volume of lubricant therewithin.
  • Glass transition point or “Tg” means the temperature at which a material changes from a vitreous state to a plastic state as measured on a model “DSC 4" differential scanning calorimeter available from the Perkin-Elmer Corporation.
  • the invention provides a composite abrasive article comprising at least two layers of the nonwoven abrasive article as described above compressed together and adhered by a binder, the composite article having a flexural modulus of not more than 1000 N/cm 2 (100 kgf/cm 2 ).
  • the articles of the invention include a base substrate onto which the additional components of the article are adhered.
  • the preferred substrate is one which is readily conformable to the surface of a desired workpiece and wherein the abrasive grains easily adhered to its fibrous surface.
  • a substrate is inexpensive and lightweight.
  • continuous filaments may be used in the manufacture of the substrate, the preferred substrate comprises a plurality of staple fibers having a length within the range of 10 to 50 mm and linear density within the range of 5 to 30 denier.
  • the fibers of the substrate may comprise any of a variety of materials suitable for the manufacture of fibers.
  • Exemplary materials are polymeric materials such as. for example, polyamide, polyester, polypropylene, polyethylene, polysulfone, acrylic and poly (vinyl chloride) and the like.
  • the fibers of the substrate may be a blend of fibers comprising any one or more of the foregoing materials. Additionally, substrates made with fibers comprising copolymers of the foregoing materials may be incorporated within the substrate, and blends of fiber deniers and fiber lengths are also contemplated within the scope of the invention.
  • polyester fibers are preferred because of their excellent mechanical strength as well as their heat and wear resistance.
  • Polyamide fibers e.g., nylon 6.6
  • conventional resins employed in the manufacture of nonwoven abrasives, especially phenolic resins adhere well to nylon 6,6 fibers.
  • the nonwoven base substrate has a void volume within the range of 40% to 99%. At void volumes less than 40%, it becomes difficult to achieve effective penetration of abrasive grain and binder into the substrate during the manufacture of the article. At a void volume greater than 99%, the mechanical strength and wear resistance of the resulting abrasive materials may be unacceptable for certain applications.
  • the thickness of the nonwoven fabric is within a range of 1 to 50 mm. If the thickness of the substrate is less than 1 mm, the mechanical strength of the resulting article may be poor. If the thickness is greater than 50 mm, it becomes increasingly more difficult to apply abrasive grains and resin binders inside the nonwoven substrate. Because of ease of preparation and the resulting uniformity of the finished articles, a nonwoven substrate having a thickness of 2 to 10 mm is most preferred.
  • a binder is employed to adhere the fibers of the nonwoven base substrate to one another at their mutual contact points and to adhere abrasive grain and encapsulated lubricant, discussed below, to the fibers of the substrate.
  • Any of a variety of binders can be used in the manufacture of the articles of the invention.
  • Epoxy resins are useful in the manufacture of the articles of the invention because of their high reactivity and mechanical strength.
  • Commercially available epoxy resins include those available under the trade designations "DER-331” and "DER-332” from Dow Chemical Co. Urethane resins, because of their high reactivity and bonding strength, are also suitable for use in the articles of the invention.
  • Suitable commercial urethanes include those available under the trade designations "UP-310" and “UP-340" available from Asahi Denka K.K.of Japan. Additionally, water-soluble urethane resins and a water-soluble epoxy resin may be used such as those disclosed by Krishnan et al. in U.S. Patent No. 5,306,319.
  • the finished articles of the invention will have a flexural modulus of not more than 100 kgf/cm 2 , and the preferred binders are those capable which can provide such articles.
  • phenolic resins are most preferred. Additionally, phenolic resins exhibit excellent heat resistance, abrasion resistance and mechanical strength.
  • Commercially available phenolic resins suitable for use in the invention include those available under the trade designations "Shonol BRL-105" and "Shonol BRL-107" available from Showa Kobunshi K.K. of Japan.
  • Abrasive grains are used in the articles of the invention.
  • the grains used herein may be selected from any of a variety of grains available to those in the art. If the article is to be used in more aggressive abrasive applications, grains comprised of harder materials may be used such as conventional whetstone grains including silicon carbide, aluminum oxide, chromium oxide, emery and flint either alone or in combination with one another. Of the foregoing materials, those having a JIS No. of 36 to 10000 (an average grain size of 500-0.6 ⁇ m) are particularly preferred for precision abrasion applications. Of course, the invention is not limited to the use of the foregoing grains, and those skilled in the an will appreciated that other materials can be used in the articles described herein including those comprised of softer materials for less aggressive grinding.
  • Abrasive grains may be employed in an amount within the range of 10 to 1000 parts by weight, and preferably 30 to 500 parts by weight based on 100 parts by weight of the base substrate. Although the weight of the grains used may also be outside of the foregoing ranges, the use of grain in an amount less than 10 parts by weight will typically decrease the abrasive power of the article below acceptable limits for some applications. Similarly, if the amount of grain in the article is greater than 1000 parts by weight, the abrasive grains may not bond properly to the fibers of the substrate, resulting in the loss of a significant portion of the grains during use.
  • the articles of the invention include a lubricant capsule bonded to the fibers of the substrate by the aforementioned binder.
  • the lubricant capsule comprises an envelope in the form of a continuous shell and a core substance comprising a lubricant contained within the envelope.
  • the preferred lubricant capsule for use in the invention is prepared to have solvent resistance as well as heat resistance.
  • the envelope of the lubricant capsules of the present invention preferably will have a glass transition point (Tg) sufficiently high to avoid softening during the manufacture of the nonwoven abrasive materials while allowing a softening of the capsule during an abrasive application of the finished article to thereby release the encapsulated lubricant during use.
  • Tg glass transition point
  • a glass transition point of at least 160°C is preferred because of the temperatures employed in the drying step used in the preparation of nonwoven abrasive. Materials having a glass transition point of more than 180°C are preferred for abrasive materials to be used in high speed.
  • the lubricant capsule comprises a crosslinked polymer because of the ability of such materials to satisfy the aforementioned solvent resistance requirements.
  • suitable crosslinked polymers include: epoxy resin, urea resin (e.g., urea-formaldehyde resin, urea-acetaldehyde resin, urea-propionaldehyde resin, and urea-butylaldehyde resin), melamine resin (e.g., melamine-formaldehyde resin, melamine-acetaldehyde resin, melamine-propionaldehyde resin and melamine-butylaldehyde resin), phenol resin (e.g., phenol-formaldehyde resin, phenol-acetaldehyde resin, phenol-propionaldehyde resin, phenol-butylaldehyde resin, xylenol-formaldehyde resin, xylenol-acetaldehyde resin, xyl
  • the preferred materials for the manufacture of the continuous shell of the lubricant capsule comprises a polymeric component and a suitable crosslinking material.
  • the mole ratio between the polymeric component such as urea, melamine and phenol and the like and the crosslinking component (e.g., formaldehyde) is within the range from 1:1.2 to 1:1.7. Ratios within this range will provide a satisfactory reactivity and low amount of residual unreacted crosslinking material.
  • a urea resin and a melamine resin are particularly preferred due to their excellent solvent resistance.
  • the most preferred resin in making the capsules is a urea resin.
  • Suitable lubricants for inclusion in the lubricant capsules include petroleum-derived lubricants (e.g., paraffin wax), synthetic resin lubricants (e.g., silicone oil, olefin polymerized oil, diester oil, polyoxyalkylene glycol, and halogenated hydrocarbon oil, etc.), and fatty acids (e.g., stearic acid and myristic acid, etc.).
  • petroleum-derived lubricants e.g., paraffin wax
  • synthetic resin lubricants e.g., silicone oil, olefin polymerized oil, diester oil, polyoxyalkylene glycol, and halogenated hydrocarbon oil, etc.
  • fatty acids e.g., stearic acid and myristic acid, etc.
  • Lubricant capsules are included in the nonwoven articles of the invention in an amount of 1 to 100 parts by weight based on 100 parts by weight of nonwoven fabric. If the amount of lubricant capsules is less than 1 part by weight; satisfactory lubricity may not be provided. If the amount of lubricant capsules exceeds 100 parts by weight, the amount of abrasive grain which is able to adhere to the base substrate may decrease with a corresponding decrease in the abrasive power of the finished article. To balance the abrasive power and lubricity, the amount of lubricant capsules in the finished article is preferably within the range of 5 to 50 parts by weight and more preferably within the range of 10 to 30 parts.
  • the lubricant capsules employed in the present invention may be prepared by the following procedure:
  • a suitable lubricant is fed into an aqueous solution of a resin.
  • the temperature and the stirring speed of the mixture is controlled in a known manner so that the lubricant may form droplets of appropriate size.
  • the crosslinking reaction of the resin is initiated to yield capsules containing lubricant therein.
  • formalin, urea and a pH adjuster are placed in a suitable reaction vessel and the temperature of the mixture is controlled within the range 25 to 90°C.
  • the mixture is stirred for 1 to 24 hours to give a water-soluble urea-formaldehyde resin.
  • the temperature of the resin solution is then adjusted to exceed the melting point of the lubricant (e.g., 60 to 90°C), and the lubricant is added with stirring and thereby melted.
  • Acid having pH of 3 to 6 e.g., citric acid
  • a preferred curing catalyst for use in the above reactive procedure is a weak acid, preferably those having a pH within the range of 3 to 6.
  • the condensation reaction will proceed faster than the addition reaction of formalin to urea, so that crosslinking reaction is carried out most efficiently.
  • the envelope of the capsules will have a high crosslinking density and improved solvent and heat resistance.
  • a weak acid can be handled more safely than a strong acid, and any weak acid remaining on the lubricant capsule will present less of a hazard to the workpiece than the stronger acids might.
  • Citric acid, boric acid, malic acid, phosphoric acid and the like are suitable for use as the curing catalyst.
  • the outer surfaces of the lubricant capsules are optionally coated with a thin metal or metallic oxide film to further improve the solvent resistance and abrasive power of the finished abrasive articles.
  • the metallic coatings useful in the present invention comprise thin coatings of metals or metallic oxides of nickel, copper, zinc, silver, lead or tin. The coatings may be applied to the lubricant capsules in a known manner by conventional vacuum evaporation, sputtering or by chemical plating, for example.
  • Lubricant capsules of a size less than the space between fibers of the base substrate may be used.
  • the linear density of the fibers used in the nonwoven base substrate will preferably be within the range of 5 to 30 denier.
  • a preferred grain size for the lubricant capsules is 5 to 300 ⁇ m.
  • the grain size of the capsules is less than 5 ⁇ m, the capsules will be more difficult to rupture during an abrasive application.
  • the grain size of the lubricant capsules is greater than 300 ⁇ m, the capsules may interfere with the ability of the abrasive grains and the binder to effectively enter the inner areas of the nonwoven base substrate.
  • a grain size of 20 to 150 ⁇ m is preferred, and in order to allow for the uniform destruction of the lubricant capsules during an application of the finished articles, a grain size within the range of 10 to 20 ⁇ m is more preferred.
  • the continuous shell or envelope of the lubricant capsules preferably has a thickness within the range from 0.5 to 20 ⁇ m. At a thickness less than 0.5 ⁇ m, heat and solvent resistance may be poor. If the thickness is beyond 20 ⁇ m, the capsules may be too hard to break during an abrasive application. To allow for the uniform destruction of capsules during use, a thickness within the range of 1 to 10 ⁇ m is preferred, and a thickness in the range of 2 to 7 ⁇ m is more preferred.
  • the abrasive articles of the invention can be prepared in the following procedure.
  • a prebonded nonwoven base substrate comprising polyamide fibers and the like is treated with a mixture containing abrasive grain, binder (e.g., phenolic resin), solvents (e.g., ethylene glycol monoethyl ether acetate) and lubricant capsules.
  • binder e.g., phenolic resin
  • solvents e.g., ethylene glycol monoethyl ether acetate
  • lubricant capsules which are solvent resistant are preferred.
  • commercially available nonwoven abrasive materials may be used, and a mixture of lubricant capsules in a suitable binder may be applied to the nonwoven.
  • Suitable commercial abrasive materials include those made of conventional nonwoven materials comprising polyamide fibers or polyester fibers with abrasive grains adhered to the fibers with a suitable binder.
  • Preferred are those article having abrasive particles of JIS No. 36 to 10000 such as silicon carbide, aluminum oxide, chromium oxide, emery and flint.
  • Exemplary of this kind of nonwoven abrasive material is those available under the trade designation "Scotch-Brite" from the Minnesota Mining and Manufacturing Company of St. Paul, Minnesota, USA After applying the lubricant capsule and binder, the article is heated in an oven at about 160°C for about 15 minutes to dry the organic solvent and to solidify a binder.
  • the thus obtained open, lofty nonwoven abrasive article will have a basic weight within the range of 20 to 10,000 g/m 2 with enough flexibility to conform to the contours along the surface of a workpiece.
  • the basic weight of the article will be within the range of 40 to 6000 g/m 2 and more preferably 100 to 5000 g/m 2 .
  • the article of the invention will have a nominal density within the range of about 0.01 to 1.00 g/cm 3 , preferably 0.02 to 0.60 g/cm 3 , more preferably 0.05 to 0.50 g/cm 3 .
  • the above described articles may be further processed into bonded wheels in a known manner.
  • Convolute wheels for example, may be provided by taking a single continuous sheet of the above described nonwoven article and shaping it into a roll or disk by coiling the article over a core.
  • unitized wheels can be provided by cutting the above provided nonwoven abrasive articles into a plurality of individual pieces (e.g., squares). The individual pieces are stacked one upon another, compressed and laminated together by the application of pressure and heat.
  • the nonwoven abrasive materials are preferably compressed to a density 1 to 20 times that of the density of the materials in its uncompressed state and subjected to heat molding for 4 hours at an elevated temperature, usually at 135°C.
  • the thus treated laminates can then be cooled and cut into to provide a bonded wheel.
  • the nonwoven abrasive articles of the invention can be used in the manufacture of flap brushes.
  • the aforementioned bonded wheel or brush can be prepared by using a mixture containing lubricant capsules, binders and organic solvents, in place of the binders alone in the above stated procedure.
  • the lubricant capsules must be made of a material having solvent resistance as well as heat resistance.
  • the present nonwoven abrasive materials made according to the above-mentioned procedure generally have a flexural modulus of not more than 10000 N/m 2 (1,000 kgf/cm 2 ), preferably 10 to 5000 N/cm 2 (1 to 500 kgf/cm 2 ), more preferably 100 to 5000 N/cm 2 (10 to 500 kgf/cm 2 ).
  • the abrasive material having such a range of basic weight shows flexibility so as to deform readily along with the working surface of the workpiece to be abraded. In this manner, the articles of the invention allow for the precise and uniform abrasive treatment of complex surfaces.
  • a raw nonwoven fabric having a basic weight of 100 g/m 2 was prepared by the use of a 15 denier nylon having a fiber length of 38 mm on a web forming machine, followed by fiber fixation by the use of a phenolic resin ("Shonol BRL-107" from Showa Koubunshi K.K. of Japan). The web was then heated for 15 minutes at 140°C and cooled to a non-tacky condition to provide a pre-bonded substrate having a basic weight of 150 g/m 2 .
  • a portion of the capsules prepared according to the above described preparative procedure was further coated with an aluminum using aluminum foil and a metal evaporating machine (model "JEE-4X” manufactured by Nippon Denshi K.K., Japan).
  • the aluminum was applied to the capsules to have a thickness of about 100 to 1000 angstroms.
  • the aluminum foil was heated to a temperature of 100°C under a pressure of 1-2 x 10 5 Torr, and the resulting aluminum vapor was deposited onto a surface of the capsules over a time of 10 to 30 seconds.
  • Nonwoven abrasive materials made according to the foregoing preparative procedure were cut in a disk shape and the disks were laminated together using a polyether urethane resin and compressed under a pressure of 10 N/cm 2 (1 kgf/cm 2 ) and a density of 12 sheets per inch (2.54 cm).
  • the article was then cured in a batch oven at a temperature of 135°C for 4 hours to provide an abrasive article in the form of a bonded wheel.
  • the flexural modulus of the resulting wheel was 2000 N/cm 2 (200 kgf/cm 2 ).
  • Lubricant capsules were prepared according to the above preparative procedure. The resulting capsules were evaluated to determine their solvent resistance and heat resistance, as reported below.
  • Metalized capsules were prepared according to the above preparative procedure. The capsules were evaluated to determine their solvent resistance and heat resistance, as reported below.
  • acrylic resin capsules were purchased from Matsumoto-Yasui Co. Ltd. of Japan The capsules were evaluated to determine their solvent resistance and heat resistance, as reported below.
  • the solvent resistance of the capsules of Examples 1 and 2 and Comparative Example A were tested by immersing a portion of the capsules in ethylene glycol monoethyl ether acetate. The acrylic capsules dissolved immediately, showing no resistance to the solvent. After a six month period in the solvent, the capsules of Examples 1 and 2 were removed and examined by microscopy. Inspection of the inventive capsules indicated excellent solvent resistance. In general, these capsules did not appear to be significantly eroded by the long exposure to solvent.
  • the metalized capsules of Example 2 were evaluated as having slightly better solvent resistance than the capsules of Example 1.
  • a bonded wheel was prepared according to the above preparative procedure.
  • Example 3 The wheel of Example 3 was examined by microscopy to inspect the condition of the lubricant capsules contained within the wheel. No change was observed in the lubricant capsules in the final product, indicating that the lubricant capsules were able to withstand exposure to the solvents and the heat associated with the manufacture of a bonded wheel.
  • the MG wheel 5S-2010 comprises a nonwoven abrasive prepared by impregnating nonwoven web made of a 15 denier nylon fiber having a length of 38 mm with a slurry comprised of abrasive grains and a phenol resin, and pressing a stack made of several sheets of the resulting web having a thickness of 5 mm under a pressure of 10 N/cm 2 (1 kgf/cm 2 ) by the use of a polyether urethane resin.
  • Comparative Example B included no lubricant capsules.
  • a commercially available MG wheel 5S-2010 was obtained as in Comparative Example B.
  • the grinding surface of the wheel was coated with a lubricating grease and the thus coated wheel was used in the comparative testing set forth below.
  • Example 3 A continuous abrasion test was conducted for the articles of Example 3 and Comparative Examples B and C using a centerless abrasion machine (by Nisshinbo Industries. Inc.. Japan) under the conditions given below. A time dependent determination of the abrasive power was made for the tested articles. The amount of cut (mg) was determined from the weight difference between pre- and post-abrasion of the steel rod used in the test, which difference was determined at the time intervals indicated in Table I
  • the abrasion test conditions were: Steel rod 10mm dia x 150mm length Feed rate 2 m/min Load 3 amp/25 mm/200 V Abrasion time 45 sec Cut (mg) Time 0 min 5 min 10 min 30 min 60 min 120 min 180 min Ex. 3 143.7 -- 150.1 158.3 149.9 147.8 160.9 C.Ex. B 35.4 -- 12.1 14.6 8.3 14.6 10.4 C.Ex.C 66.6 18.7 12.5 10.4 -- -- --
  • the wheel of Example 3 was capable of providing an improved initial lubricative effect compared to the wheels of the Comparative Examples and also was able to maintain its improved abrasive power over the duration of the testing procedure without the need for additional lubricant.
  • the wheels of the Comparative Examples did not perform as well as the wheel of inventive Example 3 at any of the time intervals.
  • the wheel of Comparative B showed a decrease in abrasive power after the initial measurement with the cut leveling off to be fairly constant thereafter.
  • the wheel of Comparative Example C exhibited good initial cut which soon diminished.
  • the lubricant capsules of the present invention clearly provide sufficient solvent and heat resistance to endure the solvent and heat employed in the preparation process for nonwoven abrasive articles.
  • the uniform destruction of the capsules during use provides continuous release of lubricant and continued lubricity without the need for additional lubricant from other sources.
  • the abrasive articles of the invention exhibit excellent abrasive power over the duration of time during which the article is being used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Laminated Bodies (AREA)

Claims (18)

  1. Article abrasif comprenant:
    un substrat non tissé, déformable ayant un volume de vide de 40 à 99%, comprenant une pluralité de fibres polymères collées les unes aux autres au niveau des points de contact mutuels, ledit substrat ayant un poids de base dans la gamme de 20 à 10 000 g/m2 et un module en flexion ne dépassant pas 10 000 N/cm2 d'abrasif;
    des grains abrasifs collés audit substrat; et
    1 à 100 parties en poids, basées sur 100 parties en poids du substrat non tissé, de capsules comprenant une coque continue collée audit substrat et contenant un lubrifiant à l'intérieur, ladite coque comprenant une résine thermodurcissable durcie.
  2. Article abrasif selon la revendication 1, dans lequel lesdites fibres sont des fibres courtes ayant une longueur dans la gamme d'environ 10 à 50 mm et un denier dans la gamme d'environ 5 à 30.
  3. Article abrasif selon la revendication 2, dans lequel lesdites fibres comprennent des matières choisies dans le groupe formé par le polyamide, le polyester, le polypropylène, le polyéthylène, la polysulfone, l'acrylique, le poly(chlorure de vinyle) et les combinaisons de l'une quelconque des matières précédentes.
  4. Article abrasif selon la revendication 3, dans lequel ledit polyamide est le nylon 6,6.
  5. Article abrasif selon la revendication 1, dans lequel lesdits grains abrasifs comprennent des matières choisies dans le groupe formé par le carbure de silicium, l'oxyde d'aluminium, l'oxyde de chrome, l'émeri et le silex.
  6. Article abrasif selon la revendication 5, dans lequel lesdits grains abrasifs ont une granulométrie moyenne dans la gamme d'environ 0,6 à 500 µm.
  7. Article abrasif selon la revendication 1, dans lequel lesdits grains abrasifs sont présents dans les articles en une quantité dans la gamme d'environ 10 à 1 000 parties en poids pour 100 parties en poids dudit substrat.
  8. Article abrasif selon la revendication 1, dans lequel lesdites capsules comprennent une résine thermodurcissable choisie dans le groupe formé par la résine époxy, la résine urée, la résine mélamine, la résine phénolique et la résine polyamide.
  9. Article abrasif selon la revendication 8, dans lequel ladite résine urée est choisie dans le groupe formé par la résine urée/formaldéhyde, la résine urée/acétaldéhyde, la résine urée/propionaldéhyde et la résine urée/butylaldéhyde.
  10. Article abrasif selon la revendication 8, dans lequel ladite résine mélamine est choisie dans le groupe formé par la résine mélamine/formaldéhyde, la résine mélamine/acétaldéhyde, la résine mélamine/propionaldéhyde et la résine mélamine/butylaldéhyde.
  11. Article abrasif selon la revendication 8, dans lequel ladite résine phénolique est choisie dans le groupe formé par la résine phénol/formaldéhyde, la résine phénol/acétaldéhyde, la résine phénol/propionaldéhyde et la résine phénol/butylaldéhyde, la résine xylénol/formaldéhyde, la résine xylénol/acétaldéhyde, la résine xylénol/propionaldéhyde et la résine xylénol/butylaldéhyde.
  12. Article abrasif selon la revendication 1, dans lequel ladite résine est une résine urée réticulée comprenant le produit réactionnel de l'urée et d'un agent de réticulation à un rapport molaire d'urée audit agent de réticulation dans la gamme de 1:1,2 à 1:1,7.
  13. Article abrasif selon la revendication 1, dans lequel ladite résine possède une température de transition vitreuse d'au moins environ 160°C.
  14. Article abrasif selon la revendication 1, dans lequel ledit lubrifiant est choisi dans le groupe formé par la cire de paraffine, l'huile de silicone, l'huile d'oléfine polymérisée, l'huile diester, le polyoxyalkylèneglycol, et l'huile hydrocarbonée halogénée et les acides gras.
  15. Article abrasif selon la revendication 1, comprenant de plus un film entourant ladite résine, ledit film se composant d'un métal ou d'un oxyde métallique de nickel, de cuivre, de zinc, d'argent, de plomb ou d'étain.
  16. Article abrasif selon la revendication 1, dans lequel lesdites capsules sont d'une taille dans la gamme d'environ 5 à 300 µm.
  17. Article abrasif selon la revendication 1, dans lequel ladite coque possède une épaisseur dans la gamme d'environ 0,5 à 20 µm.
  18. Article abrasif composite comprenant au moins deux couches de l'article abrasif non tissé selon la revendication 1, comprimées ensemble et collées à l'aide d'un liant, l'article composite ayant un module en flexion ne dépassant pas 1000 N/cm2(100 kgf/cm2).
EP95935734A 1994-10-07 1995-10-06 Articles abrasifs a lubrifiant encapsule Expired - Lifetime EP0784528B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP27042794 1994-10-07
JP6270427A JPH08108373A (ja) 1994-10-07 1994-10-07 潤滑剤を芯物質として含有するカプセルを含む不織布研磨材
JP270427/94 1994-10-07
PCT/US1995/012924 WO1996011085A1 (fr) 1994-10-07 1995-10-06 Articles abrasifs a lubrifiant encapsule

Publications (2)

Publication Number Publication Date
EP0784528A1 EP0784528A1 (fr) 1997-07-23
EP0784528B1 true EP0784528B1 (fr) 2002-01-30

Family

ID=17486131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95935734A Expired - Lifetime EP0784528B1 (fr) 1994-10-07 1995-10-06 Articles abrasifs a lubrifiant encapsule

Country Status (8)

Country Link
EP (1) EP0784528B1 (fr)
JP (1) JPH08108373A (fr)
KR (1) KR970706105A (fr)
CA (1) CA2200217A1 (fr)
DE (1) DE69525260T2 (fr)
FI (1) FI971414A0 (fr)
MX (1) MX9702404A (fr)
WO (1) WO1996011085A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5248954B2 (ja) 2008-09-02 2013-07-31 スリーエム イノベイティブ プロパティズ カンパニー 抱接化合物を含む研磨材製品
WO2012082395A2 (fr) * 2010-12-14 2012-06-21 3M Innovative Properties Company Article de ponçage fibreux autonome
CN111360709B (zh) * 2020-03-31 2022-03-25 阳江市伟艺抛磨材料有限公司 一种含复合相变微胶囊的无纺布抛光轮及其制备方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3431689A (en) * 1965-03-29 1969-03-11 Armour & Co Scouring pad
US4111667A (en) * 1977-04-15 1978-09-05 Norton Company Woven polyester backed flexible coated abrasive having microballoons in backsize
AT370024B (de) * 1980-04-01 1983-02-25 Swarovski Tyrolit Schleif Schleifkoerper mit schleifkorn
US4543106A (en) * 1984-06-25 1985-09-24 Carborundum Abrasives Company Coated abrasive product containing hollow microspheres beneath the abrasive grain
JPS6352971A (ja) * 1986-08-19 1988-03-07 Daitoo:Kk デイスク形研磨材の形成方法
JP3314213B2 (ja) * 1993-03-02 2002-08-12 富山県 レジノイド砥石及びその製造方法
DE4336755A1 (de) * 1993-10-28 1995-05-04 Rueggeberg August Fa Schleifaktiver Füllstoff für Schleifwerkzeuge, seine Verwendung und den Füllstoff enthaltendes Schleifwerkzeug
DE69530976D1 (de) * 1994-03-16 2003-07-10 Minnesota Mining & Mfg Schleifgegenstände und verfahren zu ihrer herstellung

Also Published As

Publication number Publication date
FI971414A (fi) 1997-04-04
MX9702404A (es) 1997-06-28
DE69525260T2 (de) 2002-09-19
JPH08108373A (ja) 1996-04-30
DE69525260D1 (de) 2002-03-14
FI971414A0 (fi) 1997-04-04
EP0784528A1 (fr) 1997-07-23
WO1996011085A1 (fr) 1996-04-18
KR970706105A (ko) 1997-11-03
CA2200217A1 (fr) 1996-04-18

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