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.
• all flat abrasives consist of a web-shaped
• 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 stick out. An abrasive grain that has sunk too deeply into this binder layer affects the functionality of the abrasive.
• a method can be inferred from US Pat. No. 5,551,960 in which a radiation-polymerizable method is used and solvent-free binder together with the abrasive grains in one Operation is applied to the web-shaped carrier. But here too few abrasive grains protrude beyond the surface of the binder, the surface either by applying a liquid printing process similar to screen printing roughened or it is what has already been described by the thermal process known two-stage process applied.
• 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 thus 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 the binder could not evaporate.
• 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 acrylate.
• UV initiators All initiators which can be used in aqueous systems are suitable as UV initiators.
• Aluminum, silicon, chromium or iron oxide, boron nitride, 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.
• 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 maintain.
• the resulting homogeneous pasty mass is in one Another step by dilution with water on one, the respective application unit adjusted applicable 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 heated to 90 ° C in a hot air dryer expelled in 15 seconds.
• the binder is placed in a UV drying tunnel at a power of 80 W / cm under UV light with a wavelength of 250-440 nm cured from a mercury vapor lamp at a speed of 10 m / min.
• the fine grinding films produced in this way were made with a commercially available Product of the same grain size for comparison in a scanning electron microscope on their surface structure, with a cross cut device according to DIN 53151, in the 180 ° kink test for their layer adhesion and with an abrasion tester on their Effectiveness checked and the roughness of the ground surfaces with a Roughness tester measured. The results are shown in the following table.
• a commercially available fine grinding 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.
• Measurement Results comparison Pattern visual assessment of scanning electron microscopes, magn. 100 x even grain distribution like comparison Adhesion after cross-cut test (DIN 53151) Well; Level 0 Well; Level 0 180 ° kink test no flaking no flaking Abrasion performance in the Taber Abraser after 200 revolutions at 500 g load on aluminum sheet 640 mg 660 mg Roughing depths Ra of the ground sheet after 200 revolutions 0.33 ⁇ m 0.26 ⁇ m
• the binder-abrasive mixture described in Example 2 was the same Art produced and applied to the same substrate material and then hardened as already described for Example 1.
• 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.

Landscapes

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

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