Method of making an abrasive agglomerate particle

• US 6,521,004 B1
• Filed: 10/16/2000
• Issued: 02/18/2003
• Est. Priority Date: 10/16/2000
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Culler, Scott R., Nelson, Jeffrey W., Wallace, John T., McArdle, James L.
• Primary Examiner(s): MARCHESCHI, MICHAEL A
• Application Number:
  US09/688,444
• Time in Patent Office: 855 Days
• Field of Search: 512/98, 513/07, 513/08, 513/09, 512/93, 233/13.R, 264/118, 264/143, 264/142, 264/460, 264/461, 264/462, 264/638, 264/639, 264/655, 264/660, 264/681, 264/117
• US Class Current: 51/298
• CPC Class Codes: B24D 11/005 Making abrasive webs
• CPC Class Codes: B24D 3/14 ceramic, i.e. vitrified bondings
• CPC Class Codes: B24D 3/28 Resins or natural or synthetic macromolecular compounds B24D3/22 takes precedence
• CPC Class Codes: C04B 35/1115 Minute sintered entities, e.g. sintered abrasive grains or shaped particles such as platelets abrasives C09K3/14
• CPC Class Codes: C09K 3/1436 Composite particles, e.g. coated particles

Abstract

A method for making abrasive agglomerate particles from a composition comprising at least a radiation curable binder and solid particulates. The method comprises the steps of forcing the composition through a perforated substrate to form agglomerate precursor particles which then separate from the perforated substrate. Then, the particles are irradiated to form soldified, handleable agglomerate particles before being collected.

Claims

1. A method for making abrasive agglomerate particles comprising the steps of:

a) forcing a composition comprising a radiation curable polymerizable binder precursor and a plurality of abrasive grains through a perforated substrate to form abrasive agglomerate precursor particles;

b) separating the abrasive agglomerate precursor particles from the perforated substrate; and

c) irradiating the abrasive agglomerate precursor particles, wherein radiation energy is transmitted from a radiation energy source to the abrasive agglomerate precursor particles to at least partially cure the binder precursor to provide abrasive agglomerate particles, and wherein the process components in steps a), b), and c) are spatially oriented in a vertical and consecutive manner.

2. A method according to claim 1, wherein the abrasive agglomerate particles are collected after the irradiation step.

3. A method according to claim 1, wherein the irradiation step comprises a step of passing the abrasive agglomerate precursor particles into a first curing zone that contains the radiation source.

4. A method according to claim 1, wherein the abrasive agglomerate particles are passed through a second curing zone, wherein energy is transmitted from an energy source to the abrasive agglomerate particles to further cure the abrasive agglomerate particles.

5. A method according to claim 1, wherein the binder precursor comprises epoxy resins, acrylated urethane resins, acrylated epoxy resins, ethylenically unsaturated resins, aminoplast resins having pendant unsaturated carbonyl groups, isocyanurate derivatives having at least one pendant acrylate group, isocyanate derivatives having at least one pendant acrylate group or combinations thereof.

6. A method according to claim 1, wherein the abrasive agglomerate particles are filamentary shaped and have a length ranging from about 10 to about 1500 micrometers.

7. A method according to claim 6, wherein the length of the abrasive agglomerate particles is in a range from about 20 to about 800 micrometers.

8. A method according to claim 7, wherein the length of the abrasive agglomerate particles is in a range from about 50 to about 400 micrometers.

9. A method according to claim 1, wherein the abrasive agglomerate precursor particles further comprise a modifying additive selected from the group consisting of diluent, antistatic agent, lubricant, pigment, suspending agent, coupling agent, grinding aid, filler, inorganic binder precursor, surfactant, and a combination thereof.

10. A method according to claim 1, wherein the step of forcing the composition through the perforated substrate to form the abrasive agglomerate precursor particles comprises methods of extrusion, milling, or calendering.

11. A method according to claim 1, wherein the radiation source comprises electron beam, ultraviolet light, visible light, laser light or combinations thereof.

12. A method according to claim 3, wherein the radiation source comprises electron beam, ultraviolet light, visible light, laser light or combinations thereof.

13. A method according to claim 4, wherein the energy source comprises electron beam, ultraviolet light, visible light, microwave, laser light, thermal or combinations thereof.

14. A method according to claim 1, wherein steps (a), (b), and (c) are performed sequentially and continuously.

15. A method according to claim 10, wherein steps (a), (b), and (c) are performed sequentially and continuously.

16. A method according to claim 1, wherein the plurality of abrasive grains comprise from 5 to 95% by weight of the composition.

17. A method according to claim 15, wherein the plurality of abrasive grains comprise from 40 to 95% by weight of the composition.

18. A method according to claim 1, wherein said composition is 100% solids.

19. A method according to claim 1, wherein a size reduction step is performed on the abrasive agglomerate particles after the irradiation step.

20. A method according to claim 4, wherein a size reduction step is performed on the abrasive agglomerate particles after being passed through the second curing zone.

21. A method according to claim 20, wherein the size reduction step comprises the methods of milling, crushing and tumbling.

22. A method according to claim 19, wherein the size reduction step comprises the methods of milling, crushing and tumbling.

23. A method according to claim 1, wherein said abrasive grains comprise fused aluminum oxide, ceramic aluminum oxide, white fused aluminum oxide, heat treated aluminum oxide, silica, silicon carbide, green silicon carbide, alumina zirconia, diamond, ceria, cubic boron nitride, garnet, tripoli, or combinations thereof.