EP3562622A1 - Abrasive article and method of use - Google Patents

Abrasive article and method of use

Info

Publication number
EP3562622A1
EP3562622A1 EP17832571.8A EP17832571A EP3562622A1 EP 3562622 A1 EP3562622 A1 EP 3562622A1 EP 17832571 A EP17832571 A EP 17832571A EP 3562622 A1 EP3562622 A1 EP 3562622A1
Authority
EP
European Patent Office
Prior art keywords
abrasive
backing
article
slurry
coat
Prior art date
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.)
Withdrawn
Application number
EP17832571.8A
Other languages
German (de)
French (fr)
Inventor
Christopher J. Carter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Publication of EP3562622A1 publication Critical patent/EP3562622A1/en
Withdrawn legal-status Critical Current

Links

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
    • B24D3/001—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 supporting member
    • B24D3/002—Flexible supporting members, e.g. paper, woven, plastic materials
    • B24D3/004—Flexible supporting members, e.g. paper, woven, plastic materials with special coatings
    • 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
    • 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
    • B24D3/007—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 between different parts of an abrasive tool
    • 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
    • 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
    • B24D3/346—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 utilised during polishing, or grinding operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D2203/00—Tool surfaces formed with a pattern

Definitions

  • the present invention relates to abrasive articles and methods of using the same for polishing. More particularly, it relates to an abrasive article having a water-activated polishing compound.
  • the preparation of automotive paint surfaces following repair after accident or other damage typically involves a multistage process. This process is initiated by de- nibbing the paint applied to the surface during the repair with a relatively coarse PI 500 abrasive disc. The de-nibbed surface is then refined using a series of increasingly fine grade abrasive discs (typically P3000 and P6000), followed by a cutting compound and finally a polish.
  • abrasive discs typically P3000 and P6000
  • a coated abrasive article having
  • the abrasive coat comprising a cured abrasive slurry containing a plurality of abrasives particles
  • abrasive slurry is soluble such that it retains the abrasive particles on the backing when in a solid state, and releases the abrasive particles from the backing during the process of dissolution to a dissolved state.
  • This aspect of the invention delivers advantages as follows.
  • the article When the abrasive slurry is in its dry state, the article is able to deliver a high cut rate due to the surface texture of the cured abrasive slurry abrading the paint surface.
  • the surface texture of the slurry breaks down reducing the aggressiveness of the abrasive thereby allowing the article to deliver a high finish to the paint surface.
  • This is advantageous since the only action required by the user to initiate the change in state is to add liquid, for example water. No change of abrasive article or other tooling is required. This eliminates the need for the user to implement multiple abrasive changes to remove dust nibs and restore paint to its original finish.
  • a further significant advantage is that the requirement for a separate liquid polishing compound is eliminated. As the abrasive coat dissolves it forms a polishing compound which would otherwise have to be added to the abrasive disc by the user.
  • the abrasive article can be used in its wet state to polish a substrate simply by mounting the disc on the sander and adding water.
  • the cured slurry is attached to the backing by a liquid-softenable tie coat.
  • a liquid softenable tie coat improves the ability of the abrasive article to deliver high cut in its solid state and high finish in its dissolved state.
  • the ability of the tie coat to soften when wet allows the abrasive article to assume a degree of conformability when wet. This conformability reduces the aggressiveness of the cut and allows an improved polishing action as the article is able more readily to conform to the surface of the paint finish. This is particularly advantageous given that the surface will frequently have a curved profile.
  • the tie coat is a hydrogel.
  • the backing is flexible when wet.
  • a flexible backing further promotes the conformability of the abrasive article when wet.
  • This flexible backing acts in concert with the water-softenable tie coat to allow the article to conform to the profile of the paint surface to further improve finish.
  • the backing is a non-woven web or foam.
  • the backing is a thermoplastic web.
  • the abrasive slurry is a UV light cured abrasive slurry.
  • the abrasive slurry contains an acrylol morpholine oxide UV-curable monomer.
  • the monomer forms a linear polymer which maintains its structural rigidity allowing surface features to be cured in the surface of the abrasive article which assist in delivering high cut when the abrasive article is in its dry state.
  • the linear polymer dissolves in water allowing the abrasive coat to dissolve into a polishing compound upon addition of water by the user.
  • the abrasive slurry dissolves into a polishing compound upon dissolution by a liquid.
  • the liquid is a surfactant or emulsion or, more preferably, water.
  • the cured undissolved slurry has a surface texture comprising geometric forms.
  • the cured undissolved slurry has a surface texture comprising polygons.
  • the abrasive particles are formed of vermiculite.
  • a method of abrading a work piece including the steps of:
  • the abrasive coat comprising a cured abrasive slurry containing a plurality of abrasives particles
  • abrasive slurry is soluble such that it retains the abrasive particles on the backing when in its solid state, and releases the abrasive particles from the backing during the process of dissolution to a dissolved state.
  • polishing the work piece with the backing and polishing compound polishing the work piece with the backing and polishing compound.
  • the method includes the step of:
  • Figure 1 shows an abrasive article in the form of an abrasive disc 10.
  • the disc 10 is suitable for mounting on a rotary polisher or random orbital sander although it is conceivable within the scope of the invention that the abrasive article could be used for other forms of abrasive work.
  • the disc 10 has a backing 12 with first and second opposed major surfaces 14, 16.
  • the first major surface 14 carries a tie coat 18.
  • An abrasive coat 20 is positioned on the tie coat 18.
  • the backing 12 is formed of a non-woven thermoplastic web comprising an open, lofty, three-dimensional structure of fibers bonded to one another at their mutual contact points. Such non-woven backings are well known in the art. In an alternative embodiment the backing 12 is a foam backing and other forms of backing are conceivable within the scope of the invention.
  • the backing material, whether non-woven or foam, is flexible so as to offer a degree of compliance to the abrasive disc 10 when wet as will be described in further detail below.
  • the tie coat 18 is an optional feature of the invention, in the preferred embodiment of the invention it serves two principal purposes. Firstly, it improves the adhesion of the abrasive coat 20 to the backing and secondly it provides a degree of control over the rigidity of the backing 12. As described above, the backing 12 is inherently flexible. However, the process of UV-curing the tie coat 18 on the backing hardens the tie coat 18 which then maintains the backing 12 in a rigid state despite its inherent flexibility. This rigidity is maintained until such time as the tie coat 18 comes into contact with water (or other liquid such as an emulsion or surfactant) at which point the tie coat 18 softens. This has two effects.
  • the tie coat 18 no longer maintains the backing 12 in a rigid state allowing the adhesive disc 10 to adopt a degree of compliance. This reduces the aggression of the cut of the abrasive disc 10.
  • the tie coat permits a degree of movement in the abrasive coat 20 which further reduces the aggression of the cut.
  • the tie coat 18 contains an acrylol morpholine oxide UV-curable monomer which has a high glass transition temperature, is very hard when dry but is water-soluble in its cured linear polymer form. This solubility allows the tie coat 18 (and thereby the backing 12 to which the tie coat 18 is adhered) to transition from rigid when dry to flexible when wet.
  • the abrasive coat 20 is formed of a UV-curable abrasive slurry which contains a plurality of abrasive particles.
  • the abrasive particles in this embodiment are Alumina 5 ⁇ or Alumina 14 ⁇ although other suitable minerals fall within the scope of the invention.
  • the slurry is cast into a micro-replicated tooling to form a structured abrasive once cured. This process generates a geometric surface texture on the abrasive article in the form of polygons 22.
  • the abrasive coat 20 (by way of the polygons 22) delivers aggressive cut as the tips of the polygons abrade the workpiece.
  • the abrasive slurry like the tie coat 18 described above, contains acrylol morpholine oxide (also referred to as ACMO) which enables the abrasive slurry to dissolve upon contact with water.
  • ACMO acrylol morpholine oxide
  • the addition of water to the abrasive disc 10 causes the aggressive polygons to soften and break up. This reduces the cut of the abrasive article and increases the finish.
  • the small abrasive particles Al in the range of 5 to 14 um
  • the small abrasive particles are freed resulting in the abrasive slurry dissolving into a polishing compound which delivers a high finish to the workpiece.
  • Curing was achieved in a two stage process with the tie coat being cured before application and curing of the abrasive slurry.

Landscapes

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

Abstract

A coated abrasive article (10) having a backing (12) and an abrasive coat (20) attached to the backing (12), the abrasive coat (20) comprising a cured abrasive slurry containing a plurality of abrasives particles, wherein the abrasive slurry is soluble such that it retains the abrasive particles on the backing (12) when in its solid state, and releases the abrasive particles from the backing (12) during the process of dissolution to a dissolved state.

Description

ABRASIVE ARTICLE AND METHOD OF USE
The present invention relates to abrasive articles and methods of using the same for polishing. More particularly, it relates to an abrasive article having a water-activated polishing compound.
The preparation of automotive paint surfaces following repair after accident or other damage typically involves a multistage process. This process is initiated by de- nibbing the paint applied to the surface during the repair with a relatively coarse PI 500 abrasive disc. The de-nibbed surface is then refined using a series of increasingly fine grade abrasive discs (typically P3000 and P6000), followed by a cutting compound and finally a polish.
As a result it is common for the operative to have to change the abrasive disk multiple times during the paint rectification process. This adds complexity and cost to the process as time is spent changing tooling rather than working on the surface to be repaired.
It is an object of the invention to at least mitigate some of the problems set out above.
According to a first aspect of the invention there is provided a coated abrasive article having
a backing and an abrasive coat attached to the backing,
the abrasive coat comprising a cured abrasive slurry containing a plurality of abrasives particles,
wherein the abrasive slurry is soluble such that it retains the abrasive particles on the backing when in a solid state, and releases the abrasive particles from the backing during the process of dissolution to a dissolved state.
This aspect of the invention delivers advantages as follows. When the abrasive slurry is in its dry state, the article is able to deliver a high cut rate due to the surface texture of the cured abrasive slurry abrading the paint surface. However, when the abrasive slurry is in its dissolved state, the surface texture of the slurry breaks down reducing the aggressiveness of the abrasive thereby allowing the article to deliver a high finish to the paint surface. This is advantageous since the only action required by the user to initiate the change in state is to add liquid, for example water. No change of abrasive article or other tooling is required. This eliminates the need for the user to implement multiple abrasive changes to remove dust nibs and restore paint to its original finish.
A further significant advantage is that the requirement for a separate liquid polishing compound is eliminated. As the abrasive coat dissolves it forms a polishing compound which would otherwise have to be added to the abrasive disc by the user. In the present invention, the abrasive article can be used in its wet state to polish a substrate simply by mounting the disc on the sander and adding water.
Preferably, the cured slurry is attached to the backing by a liquid-softenable tie coat.
Advantageously, a liquid softenable tie coat improves the ability of the abrasive article to deliver high cut in its solid state and high finish in its dissolved state. The ability of the tie coat to soften when wet allows the abrasive article to assume a degree of conformability when wet. This conformability reduces the aggressiveness of the cut and allows an improved polishing action as the article is able more readily to conform to the surface of the paint finish. This is particularly advantageous given that the surface will frequently have a curved profile.
Preferably, the tie coat is a hydrogel.
Preferably, the backing is flexible when wet.
The provision of a flexible backing further promotes the conformability of the abrasive article when wet. This flexible backing acts in concert with the water-softenable tie coat to allow the article to conform to the profile of the paint surface to further improve finish.
Preferably, the backing is a non-woven web or foam.
More preferably, the backing is a thermoplastic web.
Preferably, the abrasive slurry is a UV light cured abrasive slurry.
Preferably, the abrasive slurry contains an acrylol morpholine oxide UV-curable monomer.
Advantageously, during UV-curing, the monomer forms a linear polymer which maintains its structural rigidity allowing surface features to be cured in the surface of the abrasive article which assist in delivering high cut when the abrasive article is in its dry state. Particularly advantageously, the linear polymer dissolves in water allowing the abrasive coat to dissolve into a polishing compound upon addition of water by the user. Preferably, the abrasive slurry dissolves into a polishing compound upon dissolution by a liquid.
Preferably, the liquid is a surfactant or emulsion or, more preferably, water.
Preferably, the cured undissolved slurry has a surface texture comprising geometric forms.
More preferably, the cured undissolved slurry has a surface texture comprising polygons.
Preferably, the abrasive particles are formed of vermiculite.
According to a first aspect of the invention there is provided a method of abrading a work piece, the method including the steps of:
providing a coated abrasive article having
a backing and an abrasive coat attached to the backing,
the abrasive coat comprising a cured abrasive slurry containing a plurality of abrasives particles,
wherein the abrasive slurry is soluble such that it retains the abrasive particles on the backing when in its solid state, and releases the abrasive particles from the backing during the process of dissolution to a dissolved state.
the method including the further steps of:
applying a liquid to the article to dissolve abrasive slurry in order to release the abrasives particles from the backing to form a polishing compound,
polishing the work piece with the backing and polishing compound.
Preferably, the method includes the step of:
abrading the work piece with the article in a dry state prior to adding the liquid.
The invention will now be described, by way of example only, with reference to Figure 1 which shows a cross-section through an abrasive article of the present invention.
Figure 1 shows an abrasive article in the form of an abrasive disc 10. The disc 10 is suitable for mounting on a rotary polisher or random orbital sander although it is conceivable within the scope of the invention that the abrasive article could be used for other forms of abrasive work. The disc 10 has a backing 12 with first and second opposed major surfaces 14, 16. The first major surface 14 carries a tie coat 18. An abrasive coat 20 is positioned on the tie coat 18.
The backing 12 is formed of a non-woven thermoplastic web comprising an open, lofty, three-dimensional structure of fibers bonded to one another at their mutual contact points. Such non-woven backings are well known in the art. In an alternative embodiment the backing 12 is a foam backing and other forms of backing are conceivable within the scope of the invention. The backing material, whether non-woven or foam, is flexible so as to offer a degree of compliance to the abrasive disc 10 when wet as will be described in further detail below.
Whilst the tie coat 18 is an optional feature of the invention, in the preferred embodiment of the invention it serves two principal purposes. Firstly, it improves the adhesion of the abrasive coat 20 to the backing and secondly it provides a degree of control over the rigidity of the backing 12. As described above, the backing 12 is inherently flexible. However, the process of UV-curing the tie coat 18 on the backing hardens the tie coat 18 which then maintains the backing 12 in a rigid state despite its inherent flexibility. This rigidity is maintained until such time as the tie coat 18 comes into contact with water (or other liquid such as an emulsion or surfactant) at which point the tie coat 18 softens. This has two effects. Firstly, the tie coat 18 no longer maintains the backing 12 in a rigid state allowing the adhesive disc 10 to adopt a degree of compliance. This reduces the aggression of the cut of the abrasive disc 10. Secondly, the tie coat permits a degree of movement in the abrasive coat 20 which further reduces the aggression of the cut.
The tie coat 18 contains an acrylol morpholine oxide UV-curable monomer which has a high glass transition temperature, is very hard when dry but is water-soluble in its cured linear polymer form. This solubility allows the tie coat 18 (and thereby the backing 12 to which the tie coat 18 is adhered) to transition from rigid when dry to flexible when wet.
The abrasive coat 20 is formed of a UV-curable abrasive slurry which contains a plurality of abrasive particles. The abrasive particles in this embodiment are Alumina 5 μιη or Alumina 14 μιη although other suitable minerals fall within the scope of the invention. The slurry is cast into a micro-replicated tooling to form a structured abrasive once cured. This process generates a geometric surface texture on the abrasive article in the form of polygons 22. When the abrasive disc 10 is dry, the abrasive coat 20 (by way of the polygons 22) delivers aggressive cut as the tips of the polygons abrade the workpiece.
However, the abrasive slurry, like the tie coat 18 described above, contains acrylol morpholine oxide (also referred to as ACMO) which enables the abrasive slurry to dissolve upon contact with water. Thus, the addition of water to the abrasive disc 10 causes the aggressive polygons to soften and break up. This reduces the cut of the abrasive article and increases the finish. As the dissolution continues the small abrasive particles (Alumina in the range of 5 to 14 um) are freed resulting in the abrasive slurry dissolving into a polishing compound which delivers a high finish to the workpiece.
Tie Coat Formulation Example
Abrasive Coat Formulation Example
Abrasive Coat Formulation Example 2
Curing was achieved in a two stage process with the tie coat being cured before application and curing of the abrasive slurry.

Claims

Claims:
1. A coated abrasive article having
a backing and an abrasive coat attached to the backing,
the abrasive coat comprising a cured abrasive slurry containing a plurality of abrasives particles,
wherein the abrasive slurry is soluble such that it retains the abrasive particles on the backing when in its solid state, and releases the abrasive particles from the backing during the process of dissolution to a dissolved state.
2. The article of claim 1 wherein the cured slurry is attached to the backing by a liquid-softenable tie coat.
3. The article of claim 2 wherein the tie coat is a hydrogel.
4. The article of any preceding claim wherein the backing is flexible when wet.
5. The article of claim 4 wherein the backing is a non-woven web or foam.
6. The article of claim 5 wherein the backing is a thermoplastic web.
7. The article of any preceding claim wherein the abrasive slurry is a UV light cured abrasive slurry.
8. The article of any preceding claim wherein the abrasive slurry contains an acrylol morpholine oxide UV-curable monomer.
9. The article of any preceding claim wherein the slurry dissolves into a polishing compound upon activation by fluid.
10. The article of claim 9 wherein the fluid is water.
11. The article of any preceding claim wherein the cured undissolved slurry has a surface texture comprising geometric forms.
12. The article of claim 11 wherein the geometric forms are polygons.
13. The article of any preceding claim wherein the abrasive particles are formed of vermiculite.
14. A method of abrading a work piece, the method including the steps of:
providing a coated abrasive article having
a backing and an abrasive coat attached to the backing,
the abrasive coat comprising a cured abrasive slurry containing a plurality of abrasives particles,
wherein the abrasive slurry is soluble such that it retains the abrasive particles on the backing when in its solid state, and releases the abrasive particles from the backing during the process of dissolution to a dissolved state,
the method including the further steps of:
applying a liquid to the article to dissolve abrasive slurry in order to release the abrasives particles from the backing to form a polishing compound,
polishing the work piece with the backing and polishing compound.
15. The method of claim 14 wherein the method includes the step of:
abrading the work piece with the article in a dry state prior to adding the liquid.
EP17832571.8A 2016-12-30 2017-12-27 Abrasive article and method of use Withdrawn EP3562622A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1622441.2A GB201622441D0 (en) 2016-12-30 2016-12-30 Abrasive article and method of use
PCT/IB2017/058431 WO2018122740A1 (en) 2016-12-30 2017-12-27 Abrasive article and method of use

Publications (1)

Publication Number Publication Date
EP3562622A1 true EP3562622A1 (en) 2019-11-06

Family

ID=58412313

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17832571.8A Withdrawn EP3562622A1 (en) 2016-12-30 2017-12-27 Abrasive article and method of use

Country Status (5)

Country Link
US (1) US20190337122A1 (en)
EP (1) EP3562622A1 (en)
CN (1) CN110167714A (en)
GB (1) GB201622441D0 (en)
WO (1) WO2018122740A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116512145A (en) * 2023-05-08 2023-08-01 苏州钜锋砂带研磨有限公司 High wear-resistant back velvet sand paper

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4652275A (en) * 1985-08-07 1987-03-24 Minnesota Mining And Manufacturing Company Erodable agglomerates and abrasive products containing the same
KR100494605B1 (en) * 1997-03-07 2005-06-10 미네소타 마이닝 앤드 매뉴팩춰링 캄파니 Abrasive Article for Providing a Clear Surface Finish on Glass
US8038750B2 (en) * 2007-07-13 2011-10-18 3M Innovative Properties Company Structured abrasive with overlayer, and method of making and using the same
WO2009088606A2 (en) * 2007-12-31 2009-07-16 3M Innovative Properties Company Plasma treated abrasive article and method of making same
JP5555453B2 (en) * 2008-07-24 2014-07-23 スリーエム イノベイティブ プロパティズ カンパニー Abrasive product, method for producing and using the same
EP3052271B1 (en) * 2013-10-04 2021-04-21 3M Innovative Properties Company Bonded abrasive articles and methods

Also Published As

Publication number Publication date
US20190337122A1 (en) 2019-11-07
CN110167714A (en) 2019-08-23
WO2018122740A1 (en) 2018-07-05
GB201622441D0 (en) 2017-02-15

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