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
  • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
  • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
  • B24D3/28—Resins or natural or synthetic macromolecular compounds
• • 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

Definitions

• the present invention relates to a method for producing a flat Abrasive according to the preamble of claim 1. Such a method can be found in EP-A-396150.
• the task of the binders being the abrasive grains to be anchored on the web-shaped support and against breaking out to back up. It is crucial that the abrasive grains are not too small from the binder protrude. An abrasive grain that has sunk too deeply into this layer of binder affects the functionality of the abrasive.
• the present invention is therefore based on the object of a method of Generic type to develop so that a simple, inexpensive, in essential emission-free production with simultaneous optimization of the abrasive Surface in terms of grinding performance is possible.
• emission-free radiation curing is used for the manufacture Above all can use fine abrasives without reducing the grinding performance of the abrasive on the one hand because of a masking of the abrasive grains by the Binder and on the other hand the anchoring of the abrasive grains in the binder Shade formation on the back of the abrasive grain and thereby hardening is impeded of the binder is impaired. It was to be expected that one Curing the mixture using UV light or electron beams creates a shadow would occur below the abrasive grain, i.e. that due to absorption through the abrasive grains the UV or electron radiation below the areas Abrasive grain would not reach.
• the mixture used becomes an applicable one Have viscosity because the water supplied in the form of delivery of the binder could not evaporate.
• the mixture becomes water before application to adjust the viscosity added.
• binders are e.g. water soluble or dilutable acrylic prepolymers or emulsions of oligomers or unsaturated acrylic monomers, e.g. unsaturated polyesters and polyester acrylates as well as epoxy and urethane acrylates, such as those used in "radiation curing", Peter G. Garatt, Vincentz-Verlag Hannover, 1996.
• Other examples are water-soluble aliphatic urethane acrylates or a water-soluble one Polyester.
• UV initiators All initiators which can be used in aqueous systems are suitable as UV initiators.
• Aluminum, silicon, chromium or iron oxide, bomitrite, silicon carbide can be used as the abrasive or diamond can be used. Water is used to control the Viscosity of the coating mass to be produced.
• composition Type Parts by weight Polyester acrylate, water-dilutable 50 Alpha-hydroxy-ketone 3 UV initiator 2 alumina 55
• the water-emulsifiable polyester acrylate 50 parts by weight are mixed with 2 Parts by weight of benzophenone and 3 parts by weight of a UV initiator in one Mixing device (e.g. a propeller mixing vessel) mixed.
• a UV initiator e.g. a propeller mixing vessel
• the mixture is mixed in with the binding agent for intimate wetting of the abrasive grains a three-roller chair. Depending on the roller geometry, the resulting frictional heat and the free surface of the amount of substance continuously added in small amounts of water to create a friable consistency to maintain.
• the resulting homogeneous pasty mass is in one Another step by dilution with water on one, the respective application unit adapted applied viscosity brought.
• water is added until a viscosity of approx. 1,500 mPas is reached, with which a wet layer thickness of approx. 30 ⁇ m is achieved.
• an 80 ⁇ m polyester film was used as the substrate, as they also for the partially commercially available fine grinding films or microfinishing films are used.
• the substrate is used to improve adhesion subjected to a normal corona pretreatment.
• the water is expelled in a hot air dryer up to 90 ° C in 15 seconds.
• the binder is then cured in a UV drying tunnel at an output of 80 W / cm under UV light with a wavelength of 250-440 nm from an Hg vapor lamp at a speed of 10 m / min.
• the fine abrasive films produced in this way were tested for their surface structure with a commercially available product of the same grain size as a comparison in a scanning electron microscope, with a cross-cut device according to DIN 53151, in a 180 ° kink test for their layer adhesion and with an abrasion tester for their effectiveness and the surface roughness ground surfaces measured with a roughness tester. The results are shown in the table below.
• a commercially available fine sanding film served as a comparison.
• the roughness was with measured with a mechanical stylus.
• the manufactured according to the invention Muster achieved a slightly improved polishing effect with the same usability with slightly reduced abrasion performance.
• Composition Type Wt. TI. Acrylic oligomer, water-dilutable 50 Alpha-hydroxy-ketone 2 trimethylpropanetriacrylate 3 alumina 55 Test results example 2 Measurement Results comparison Pattern according to the invention visual assessment of scanning electron microscopes, magn.
• binder systems listed in the two examples are examples of all water-borne radiation-emulsifiable or emulsifiable binders.
• the following binders can preferably be used in the sense of the invention find: water-soluble polyethylene glycol diacrylates, water-dispersible Acrylic oligomers, water-dilutable alkoxylated triacrylates, water-dilutable aliphatic Urethane acrylates, water-thinnable polyether acrylates, water-thinnable ethoxylated trimethylpropane triacrylates, water-dilutable aromatic urethane acrylates, water-dilutable or water-dispersible aliphatic urethane acrylates, water-dilutable aliphatic epoxy acrylates.

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

Applications Claiming Priority (2)

Publications (3)

Family

ID=7812983

Family Applications (1)

Country Status (4)

Family Cites Families (2)

• 1997
  • 1997-11-27 AT AT97120784T patent/ATE258099T1/de not_active IP Right Cessation
  • 1997-11-27 EP EP97120784A patent/EP0845330B1/de not_active Expired - Lifetime
  • 1997-11-27 DE DE59711232T patent/DE59711232D1/de not_active Expired - Lifetime
  • 1997-11-27 ES ES97120784T patent/ES2214583T3/es not_active Expired - Lifetime

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