US20220193865A1 - Method for Treating an Abrasive Article, and Abrasive Article - Google Patents
Method for Treating an Abrasive Article, and Abrasive Article Download PDFInfo
- Publication number
- US20220193865A1 US20220193865A1 US17/298,161 US201917298161A US2022193865A1 US 20220193865 A1 US20220193865 A1 US 20220193865A1 US 201917298161 A US201917298161 A US 201917298161A US 2022193865 A1 US2022193865 A1 US 2022193865A1
- Authority
- US
- United States
- Prior art keywords
- abrasive article
- release agent
- agent dispersion
- dispersion
- abrasive
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 76
- 239000006185 dispersion Substances 0.000 claims abstract description 67
- 239000003795 chemical substances by application Substances 0.000 claims description 135
- 238000000227 grinding Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 239000000945 filler Substances 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 239000004094 surface-active agent Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 description 31
- 239000002245 particle Substances 0.000 description 20
- 239000000758 substrate Substances 0.000 description 20
- 239000006061 abrasive grain Substances 0.000 description 14
- 239000002612 dispersion medium Substances 0.000 description 12
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 9
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 239000004310 lactic acid Substances 0.000 description 4
- 235000014655 lactic acid Nutrition 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000002202 Polyethylene glycol Chemical class 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 229920001223 polyethylene glycol Chemical class 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000002759 woven fabric Substances 0.000 description 3
- 229920002873 Polyethylenimine Chemical class 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical class NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 2
- 239000008116 calcium stearate Substances 0.000 description 2
- 235000013539 calcium stearate Nutrition 0.000 description 2
- 239000004202 carbamide Chemical class 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 150000003014 phosphoric acid esters Chemical class 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 description 1
- 239000005695 Ammonium acetate Substances 0.000 description 1
- 239000004251 Ammonium lactate Substances 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 235000019257 ammonium acetate Nutrition 0.000 description 1
- 229940043376 ammonium acetate Drugs 0.000 description 1
- 229940059265 ammonium lactate Drugs 0.000 description 1
- 235000019286 ammonium lactate Nutrition 0.000 description 1
- RZOBLYBZQXQGFY-HSHFZTNMSA-N azanium;(2r)-2-hydroxypropanoate Chemical compound [NH4+].C[C@@H](O)C([O-])=O RZOBLYBZQXQGFY-HSHFZTNMSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- RYEOCIUXFIZXNC-UHFFFAOYSA-L dipotassium;docosyl phosphate Chemical compound [K+].[K+].CCCCCCCCCCCCCCCCCCCCCCOP([O-])([O-])=O RYEOCIUXFIZXNC-UHFFFAOYSA-L 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- POULHZVOKOAJMA-UHFFFAOYSA-M dodecanoate Chemical compound CCCCCCCCCCCC([O-])=O POULHZVOKOAJMA-UHFFFAOYSA-M 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- IPCSVZSSVZVIGE-UHFFFAOYSA-M hexadecanoate Chemical compound CCCCCCCCCCCCCCCC([O-])=O IPCSVZSSVZVIGE-UHFFFAOYSA-M 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229940070765 laurate Drugs 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 229940105132 myristate Drugs 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 229910000064 phosphane Inorganic materials 0.000 description 1
- 150000003002 phosphanes Chemical class 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Images
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
Definitions
- the invention relates to a method for treating an abrasive article, where a release agent dispersion is applied at least to a surface of the abrasive article intended for grinding to produce a covering layer, where the release agent dispersion comprises at least one anti-adhesion agent. Furthermore, the invention relates to a corresponding abrasive article.
- Methods for treating an abrasive article are already known, for example from U.S. Pat. Nos. 5,766,277 B and 2,768,886 B, and in these a release agent dispersion is applied at least to the surface of the abrasive article intended for grinding to produce a covering layer, where the release agent dispersion comprises at least one anti-adhesion agent.
- the invention proceeds from a method for treating an abrasive article, in particular a coated abrasive article, where a release agent dispersion is applied at least to a surface of the abrasive article intended for grinding to produce a covering layer, where the release agent dispersion comprises at least one anti-adhesion agent.
- An “abrasive article” is employed for the grinding or abrasive working of a workpiece, in which the material of the workpiece is mechanically removed in the form of swarf from the surface of the workpiece.
- the abrasive article is, in particular, a coated abrasive article.
- the abrasive article comprises an abrasive article substrate, in particular a flexible abrasive article substrate, having at least one layer.
- the abrasive article substrate can comprise, in particular, paper, paperboard, vulcanized fiber, foam, a polymer, a textile structure, in particular a woven fabric, formed-loop knitted fabric, drawn-loop knitted fabric, braid, nonwoven, or a combination of these materials, in particular paper and woven fabric, in one or more layers.
- the abrasive article substrate in particular flexible abrasive article substrate, gives the abrasive article specific properties in respect of adhesion, elongation, tear strength and tensile strength, flexibility and stability.
- abrasive grains are fixed by means of a binder (often referred to as base binder) on the abrasive article substrate.
- the abrasive grains are at least prefixed, in particular fixed, in particular in a desired orientation and/or distribution, on the abrasive article substrate.
- suitable binders for fixing abrasive grains on the abrasive article substrate are typically solvent-based adhesives such as polychloroprene.
- a further binder known as a covering binder which is applied, in particular, as a layer over the abrasive grains which have been fixed by means of the base binder on the abrasive article substrate.
- the covering binder bonds the abrasive grains firmly to one another and firmly to the abrasive article substrate.
- Suitable covering binders will be adequately known to a person skilled in the art from the prior art.
- Possible covering binders are, in particular, synthetic resins such as for example phenolic resin, epoxy resin, urea resin, melamine resin, polyester resin.
- further additives (“grinding additives”) can be provided in order to give the abrasive article specific properties. A person skilled in the art will be familiar with such additives.
- abrasive articles such as for example bonded abrasive articles
- Bonded abrasive articles are, in particular, typically synthetic resin-bonded parting and grinding disks, with which a person skilled in the art will be familiar.
- synthetic resin-bonded parting and grinding disks a composition is produced by mixing abrasive minerals together with fillers, pulverulent resin and liquid resin and this is then pressed to give parting and grinding disks of various thickness and diameters.
- the parting and grinding disks also comprise woven fabric layers composed of glass fibers. Curing of the composition typically occurs at about 180° C.
- advantages according to the invention can also be achieved in the case of such abrasive articles.
- the abrasive article has a surface intended for grinding, i.e. an abrasive surface, in particular on that side of the abrasive article on which the abrasive grains are fixed and optionally provided with a covering binder and/or a further additive.
- the abrasive surface of the abrasive article is moved over a workpiece to be worked during a grinding operation, so that a grinding effect is produced by the abrasive grains arranged on the abrasive surface.
- the abrasive article can in principle be present in various manufactured forms, for example as grinding disk or as grinding belt, as sheet, roller, strip or as abrasive article stock strip (e.g. in production).
- release agent dispersion which is applied to the surface intended for grinding of the abrasive article refers to, in particular, a lubricant dispersion.
- the release agent dispersion is employed for application of materials present in the dispersion to the surface of the abrasive article, with these materials being present as fine, essentially insoluble particles in the dispersion medium (also: dispersion agent) of the release agent dispersion.
- the release agent dispersion comprises water as dispersion medium.
- the dispersion medium can also be formed by ethanol, alcohol, an organic solvent or the like.
- the release agent dispersion is intended to be applied to the surface of the abrasive article and bring about formation of a covering layer on the surface.
- the release agent dispersion comprises at least one anti-adhesion agent, in particular as material present in the dispersion medium.
- an “anti-adhesion agent” is an agent which prevents or reduces accumulation of swarf formed during a grinding operation.
- the anti-adhesion agent serves to prevent or reduce accumulation of swarf in the intermediate spaces between adjacent abrasion grains, which can lead, in particular, to blocking or clogging of the abrasive surface of the abrasive article.
- the anti-adhesion agent serves to prevent or reduce the effect in which swarf sinters together, sticks together or melts together under the action of the heat arising in a grinding process and melts on the abrasive surface of the abrasive article and in this way likewise leads to blocking or clogging of the abrasive surface of the abrasive article (as is often the case for, for example, polymers, polymer surface coatings or the like to be abrasively treated). In this way, a cutting capability and in particular an operating life (service life) of the abrasive article is advantageously improved.
- the anti-adhesion agent serves as a type of lubricant between abrasive article and workpiece surface to be worked during a grinding operation.
- an anti-adhesion agent is often referred to as “stearate” in the literature about abrasive articles, even though it can comprise any materials which are useful for preventing the accumulation of swarf.
- the anti-adhesion agent can comprise metal salts of fatty acids (for example zinc stearate or calcium stearate), salts of phosphate esters (for example potassium behenyl phosphate), phosphate esters, urea-formaldehyde resins, waxes, mineral oils, crosslinked silanes, crosslinked silicones, fluorinated chemicals and/or combinations thereof as constituent.
- fatty acids for example zinc stearate or calcium stearate
- salts of phosphate esters for example potassium behenyl phosphate
- phosphate esters for example potassium behenyl phosphate
- phosphate esters for example potassium behenyl phosphate
- phosphate esters for example potassium behenyl phosphate
- phosphate esters for example potassium behenyl phosphate
- phosphate esters for example potassium behenyl phosphate
- phosphate esters for example potassium behenyl phosphate
- anti-adhesion agents are known to a person skilled in the art, for example from U.S. Pat. No. 5,766,277 B.
- the anti-adhesion agent typically does not dissolve in the dispersion medium of the release agent dispersion (for example water), so that a release agent dispersion containing the anti-adhesion agent is present.
- anti-adhesion agent particles in particular very fine anti-adhesion agents particles, “float” in the dispersion medium of the release agent dispersion.
- the anti-adhesion agent or the anti-adhesion agent particles is/are present as fine, essentially insoluble particles in the dispersion medium of the release agent dispersion.
- the release agent dispersion comprises at least one film-forming agent, in particular a filming agent and/or a gap filling agent.
- the film-forming agent can be utilized to treat an abrasive article in such a way that no strips or streaks remain on its surface as residue of a coating with the anti-adhesion agent.
- a “film-forming agent” refers to a substance which is suitable and is in particular also provided for producing bonding of individual anti-adhesion agent particles to the surface of the abrasive article and/or to close gaps between individual anti-adhesion agent particles on the surface of the abrasive article. This makes it possible to produce a layer, in particular uniform layer, or a film, in particular uniform film—the covering layer according to the invention—from the many individual anti-adhesion agent particles applied to the surface of the abrasive article. The covering layer advantageously no longer has individual anti-adhesion agent particles capable of refraction of light.
- filming agent brings about partial dissolution and joining of (two or more) neighboring anti-adhesion agent particles.
- filming agent brings about adhesive bonding and filming (i.e. film formation) of adjacent anti-adhesion agent particles.
- this partial dissolution, joining, adhesive bonding (may also be characterized as melting) and/or filming of adjacent anti-adhesion agent particles is made possible at advantageously low temperatures in the range from 0° C. to 100° C., in particular from 15° C. to 80° C., very particularly from 30° C. to 60° C.
- the filming agent thus acts in a manner analogous to an adhesive which partially dissolves the materials of objects to be joined in the surface region and subsequently dries.
- a film-forming agent which brings about the filling of gaps between neighboring anti-adhesion agent particles will be referred to as “gap filler”.
- a gap filler advantageously has a refractive index similar to that of the anti-adhesion agent particles, so that no or only very little refraction of light occurs at the places filled with gap filler between adjacent anti-adhesion agent particles and the gap filler thus likewise serves to produce an optically transparent (or sometimes also translucent) but homogeneous covering layer.
- the film-forming agent comprises at least one constituent which is suitable for partially dissolving anti-adhesion agent particles.
- the constituent can, for example, be selected from a list, where the list comprises at least organic acids, alcohols, amines, phosphanes, lactic acid, acetic acid, salts of lactic acid, salts of acetic acid, in particular ammonium salts of lactic acid (ammonium lactate) or ammonium salts of acetic acid (ammonium acetate), polyethylenimine, polyethylene glycol, urea and mixtures thereof.
- Polyethylenimine in particular has good properties as film-forming agent, in particular as filming agent, since it becomes solid and does not diffuse after treatment of the abrasive article, in particular does not diffuse into the abrasive article.
- Polyethylene glycol has been found to be an advantageous gap filler.
- Urea which is partially dissolved by one of the abovementioned film-forming agents, is likewise suitable as good gap filler.
- the release agent dispersion contains at least one surfactant.
- Surfactants which are able to achieve good leveling, i.e. good spread, of the release agent dispersion on the surface of the abrasive article while the abrasive article is being treated in the method of the invention are particularly suitable.
- a surfactant leads to an advantageous equalization of amounts of release agent dispersion applied to the surface if the release agent dispersion is not applied homogeneously over the surface (self-leveling). This equalization occurs by flow of the release agent dispersion.
- the release agent dispersion is applied to the surface of the abrasive article at a temperature of the abrasive article in the range from 0° C. to 100° C., in particular from 15° C. to 80° C., very particularly from 30° C. to 60° C.
- a temperature of above 0° C. leads to evaporation of the dispersion medium water, with the anti-adhesion agent and the film-forming agent remaining on the surface of the abrasive article—where a gap filler fills gaps between anti-adhesion agent particles and/or a filming agent partially dissolves and joins adjacent anti-adhesion agent particles—and the optically homogeneous covering layer being formed in this way.
- the release agent dispersion is applied to the surface of the abrasive article during the production process of the abrasive article, in particular after a process step of heating the abrasive article, very particularly before a process step for cooling the abrasive article. Accordingly, it is sufficient in order to maintain the proposed temperatures to treat the abrasive article in the still-hot state during or immediately after manufacture thereof—during which heating to typically above 70-140° C. is carried out in order to cure the binder.
- heating means heating of the abrasive article to significantly above room temperature, i.e. above 30° C., in particular above 50° C., very particularly above 70° C.
- residual heat still present in the abrasive article can be utilized and it is not necessary to reheat the abrasive article in a heating oven in a (further) process step of after-treatment.
- production process means the sequence of process steps which serve to manufacture and provide the abrasive article.
- these process steps can be formed by (1) application of base binder to an abrasive article substrate, (2) sprinkling of abrasive grains onto the abrasive article substrate covered with base binder, (3) curing of the base binder, (4) application of a covering binder, (5) drying and/or curing of the resulting abrasive article by heating of the abrasive article, (6) cooling of the abrasive article and (7) finishing (stamping or laser cutting) of the abrasive article.
- the release agent dispersion can be applied to the surface of the abrasive article during the production process of the abrasive article, in particular after the process step (5) of heating to effect drying and/or curing of the abrasive article (also: drying process step), very particularly before the cooling process step (6) for the dried/cured abrasive article and the residual heat present in the abrasive article can be utilized in this way.
- the method of the invention can be integrated in this way into an existing process chain of the production process and a corresponding process facility, for example into an existing manufacturing plant, without further, in particular complicated, machines or restructuring being necessary in the process chain and/or process facility.
- the release agent dispersion can be applied directly “in-line” onto an abrasive article stock strip (referred as stock strip) moving through a manufacturing plant and which has previously been heated for drying and curing of the binder, with the dispersion medium water of the release agent dispersion evaporating and filming of the surface occurring to form the covering layer.
- the covering layer produced by application of the release agent dispersion to the surface of the abrasive article can be dried in the process step for cooling the abrasive article by means of an air stream in such an embodiment of the method.
- the cooling effect exerted on the abrasive article is reinforced and drying of the covering layer is at the same time accelerated.
- the release agent dispersion can be applied to the surface of the abrasive article by means of doctor blade coating, rolling-on, printing, brushing or the like.
- the release agent dispersion is applied to the surface of the abrasive article by means of pulsed spraying. Pulsed spraying—i.e. repeated spraying with brief interruptions (intermittent spraying)—assists metering because the pressure and, associated therewith, droplet formation of the release agent dispersion applied to the surface of the abrasive article remain constant.
- the amount of release agent dispersion sprayed on can be altered in a simple way by varying the opening time of the spray valve (for example by changing the opening time from 10 milliseconds to 50 milliseconds per impulse).
- the opening time of the spray valve for example by changing the opening time from 10 milliseconds to 50 milliseconds per impulse.
- an otherwise necessary cleaning of adhesive boat and application roller(s) can be avoided in the cleaner process operation of spraying compared to a rolling of a solution onto the surface of the abrasive article as is known from the prior art.
- the release agent dispersion has a solids content in the range from 20% to 60%, in particular from 25% to 50%, very particularly from 30% to 40%.
- the values according to the invention are advantageous solids contents for processing the release agent dispersion.
- a particularly high solids content makes it possible to achieve a high density of anti-adhesion agent particles sprayed on the surface of the abrasive article.
- a low solids content i.e. a low-viscosity or fluid property
- a release agent dispersion having a low solids content which has been sprayed onto the surface can distribute more readily on or over the surface (by flowing).
- the solids content can be 33%.
- the invention also provides an abrasive article which has been treated by a method according to the invention.
- FIG. 1 a part of an illustrative embodiment of an abrasive article according to the invention with abrasive grains in a schematic sectional view;
- FIG. 2 a process flow diagram for depicting the method of the invention for treating an abrasive article
- FIG. 3 a process flow diagram for depicting an illustrative integration of the method of the invention as per FIG. 2 into a manufacturing process for an abrasive article.
- FIG. 1 shows a part of an illustrative embodiment of an abrasive article 10 according to the invention with abrasive grains 12 in a schematic sectional view.
- the abrasive article 10 is a coated abrasive article 10 having an abrasive article substrate made of vulcanized fiber.
- the abrasive article substrate 22 made of vulcanized fiber serves as flexible substrate for the abrasive grains 12 .
- Vulcanized fiber is a composite material composed of cellulose, in particular cotton or cellulose fibers, and is adequately known to a person skilled in the art as flexible substrate for abrasive articles from the prior art.
- the abrasive grains 12 are fastened by means of a binder 20 , in particular a base binder 24 , in the form of, for example, phenolic resin, to the abrasive article substrate 22 .
- the layer of base binder 24 and abrasive grains 12 is additionally coated with a covering binder 26 (the covering binder 26 likewise represents a binder 20 ), in particular likewise composed of phenolic resin.
- the abrasive article 10 has been treated by the method according to the invention for treating an abrasive article 10 , by a further covering layer 30 being applied to the surface 28 intended for grinding of the abrasive article 10 .
- the application of the covering layer 30 is carried out by use of the method 100 according to the invention, cf. FIG. 2 .
- FIG. 2 shows a process flow diagram to depict an embodiment of the method 100 according to the invention for treating an abrasive article 10 , with a release agent dispersion for producing a covering layer 30 being applied to at least one surface 28 of the abrasive article 10 in the treatment of the abrasive article 10 .
- a release agent dispersion comprising at least one anti-adhesion agent is provided.
- the release agent dispersion further comprises a surfactant.
- This release agent dispersion here comprises, for example, water as dispersion medium, a stearate, in particular a calcium stearate, as anti-adhesion agent.
- the release agent dispersion here has a solids content in the range from 30% to 40%, for example 35%.
- the release agent dispersion provided is admixed with at least one film-forming agent. Admixing is carried out, in particular, by blending or stirring the mixture of release agent dispersion and film-forming agent.
- the film-forming agent comprises, in particular, a filming agent and/or a gap filler. In an embodiment, the film-forming agent is a mixture of lactic acid and polyethylene glycol.
- the release agent dispersion which has been admixed with the film-forming agent is applied to the at least one surface 28 of the abrasive article 10 .
- Puld spraying onto the surface 28 of the abrasive article 10 using at least one atomizer nozzle (not shown in more detail here).
- the pulsed spraying is carried out here by repeated intermittent spraying at an average frequency of 20 Hz, with valve opening times of about 20 milliseconds.
- FIG. 3 shows a process flow diagram to depict an exemplary integration of the method 100 according to the invention as per FIG. 2 into a manufacturing process 200 for an abrasive article 10 .
- the manufacturing process 200 comprises at least the following process steps.
- an abrasive article substrate 22 for example composed of vulcanized fiber, is provided.
- a base binder 24 is applied to the abrasive article substrate 22 , for example by doctor blade coating or rolling-on.
- abrasive grains are sprinkled, for example by means of electrostatic sprinkling as is known from the prior art, onto the abrasive article substrate 22 which has been covered with base binder.
- the base binder 24 is firstly cured and subsequently coated in process step 210 with a covering binder 26 , in particular by rolling-on or brushing-on.
- the abrasive article 10 obtained in this way is dried/cured (in particular the covering binder 26 is also cured) by conveying it through a heating oven and thus heating it.
- the heating oven is, for example, heated to 120° C.
- the method steps of the method 100 according to the invention can be carried out, in particular carrying out the method steps 102 to 104 , as depicted in FIG. 3 (as an alternative, these method steps 102 to 104 can also be carried out before or after the process steps 202 to 212 are carried out).
- the release agent dispersion is applied to the surface 28 intended for grinding of the abrasive article 10 in process step 214 , i.e. method step 106 of the process of FIG. 2 is carried out.
- the release agent dispersion comprises at least one anti-adhesion agent and a film-forming agent, optionally a surfactant.
- the abrasive article 10 has a temperature of about 50° C. As described, application is carried out by means of pulsed spraying (cf. above in respect of method step 106 ).
- the covering layer 30 produced by application of the release agent dispersion to the surface 28 of the abrasive article 10 is dried by means of an air stream in a process step 216 for cooling (cooling process step) the still hot abrasive article 10 , with the still hot abrasive article 10 being cooled at the same time and the dispersion medium water of the release agent dispersion applied to the surface evaporating at the same time.
- the film-forming agents i.e. the gap filler and the filming agent, react and form an optically homogeneous, i.e. streak-free, covering layer.
- the abrasive article 10 obtained in this way can be finished, for example by stamping or laser cutting, in process step 218 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
A method for treating an abrasive article includes applying a release agent dispersion onto at least one surface, which is provided for abrading, of the abrasive article in order to produce a cover layer. The release agent dispersion includes at least one anti-adhesion agent. The release agent dispersion further includes at least one film-forming agent.
Description
- The invention relates to a method for treating an abrasive article, where a release agent dispersion is applied at least to a surface of the abrasive article intended for grinding to produce a covering layer, where the release agent dispersion comprises at least one anti-adhesion agent. Furthermore, the invention relates to a corresponding abrasive article.
- Methods for treating an abrasive article are already known, for example from U.S. Pat. Nos. 5,766,277 B and 2,768,886 B, and in these a release agent dispersion is applied at least to the surface of the abrasive article intended for grinding to produce a covering layer, where the release agent dispersion comprises at least one anti-adhesion agent.
- The invention proceeds from a method for treating an abrasive article, in particular a coated abrasive article, where a release agent dispersion is applied at least to a surface of the abrasive article intended for grinding to produce a covering layer, where the release agent dispersion comprises at least one anti-adhesion agent.
- An “abrasive article” is employed for the grinding or abrasive working of a workpiece, in which the material of the workpiece is mechanically removed in the form of swarf from the surface of the workpiece. The abrasive article is, in particular, a coated abrasive article. The abrasive article comprises an abrasive article substrate, in particular a flexible abrasive article substrate, having at least one layer. The abrasive article substrate can comprise, in particular, paper, paperboard, vulcanized fiber, foam, a polymer, a textile structure, in particular a woven fabric, formed-loop knitted fabric, drawn-loop knitted fabric, braid, nonwoven, or a combination of these materials, in particular paper and woven fabric, in one or more layers. The abrasive article substrate, in particular flexible abrasive article substrate, gives the abrasive article specific properties in respect of adhesion, elongation, tear strength and tensile strength, flexibility and stability. In a coated abrasive article, abrasive grains are fixed by means of a binder (often referred to as base binder) on the abrasive article substrate. By means of the binder, the abrasive grains are at least prefixed, in particular fixed, in particular in a desired orientation and/or distribution, on the abrasive article substrate. A person skilled in the art will know of suitable binders for fixing abrasive grains on the abrasive article substrate from the prior art. Such binders of the prior art are typically solvent-based adhesives such as polychloroprene. In addition to the binder as base binder, it is possible to use a further binder known as a covering binder which is applied, in particular, as a layer over the abrasive grains which have been fixed by means of the base binder on the abrasive article substrate. Here, the covering binder bonds the abrasive grains firmly to one another and firmly to the abrasive article substrate. Suitable covering binders, in particular, will be adequately known to a person skilled in the art from the prior art. Possible covering binders are, in particular, synthetic resins such as for example phenolic resin, epoxy resin, urea resin, melamine resin, polyester resin. In addition, further additives (“grinding additives”) can be provided in order to give the abrasive article specific properties. A person skilled in the art will be familiar with such additives.
- Furthermore, alternative abrasive articles, such as for example bonded abrasive articles, are in principle also conceivable. Bonded abrasive articles are, in particular, typically synthetic resin-bonded parting and grinding disks, with which a person skilled in the art will be familiar. For synthetic resin-bonded parting and grinding disks, a composition is produced by mixing abrasive minerals together with fillers, pulverulent resin and liquid resin and this is then pressed to give parting and grinding disks of various thickness and diameters. In particular, the parting and grinding disks also comprise woven fabric layers composed of glass fibers. Curing of the composition typically occurs at about 180° C. In combination with the method of the invention, advantages according to the invention can also be achieved in the case of such abrasive articles.
- The abrasive article has a surface intended for grinding, i.e. an abrasive surface, in particular on that side of the abrasive article on which the abrasive grains are fixed and optionally provided with a covering binder and/or a further additive. The abrasive surface of the abrasive article is moved over a workpiece to be worked during a grinding operation, so that a grinding effect is produced by the abrasive grains arranged on the abrasive surface. The abrasive article can in principle be present in various manufactured forms, for example as grinding disk or as grinding belt, as sheet, roller, strip or as abrasive article stock strip (e.g. in production).
- The term “release agent dispersion” which is applied to the surface intended for grinding of the abrasive article refers to, in particular, a lubricant dispersion. The release agent dispersion is employed for application of materials present in the dispersion to the surface of the abrasive article, with these materials being present as fine, essentially insoluble particles in the dispersion medium (also: dispersion agent) of the release agent dispersion. In one embodiment, the release agent dispersion comprises water as dispersion medium. In an alternative embodiment, the dispersion medium can also be formed by ethanol, alcohol, an organic solvent or the like. The release agent dispersion is intended to be applied to the surface of the abrasive article and bring about formation of a covering layer on the surface.
- The release agent dispersion comprises at least one anti-adhesion agent, in particular as material present in the dispersion medium. Here, an “anti-adhesion agent” is an agent which prevents or reduces accumulation of swarf formed during a grinding operation. The anti-adhesion agent serves to prevent or reduce accumulation of swarf in the intermediate spaces between adjacent abrasion grains, which can lead, in particular, to blocking or clogging of the abrasive surface of the abrasive article. In particular, the anti-adhesion agent serves to prevent or reduce the effect in which swarf sinters together, sticks together or melts together under the action of the heat arising in a grinding process and melts on the abrasive surface of the abrasive article and in this way likewise leads to blocking or clogging of the abrasive surface of the abrasive article (as is often the case for, for example, polymers, polymer surface coatings or the like to be abrasively treated). In this way, a cutting capability and in particular an operating life (service life) of the abrasive article is advantageously improved. In this way, the anti-adhesion agent serves as a type of lubricant between abrasive article and workpiece surface to be worked during a grinding operation. In particular, such an anti-adhesion agent is often referred to as “stearate” in the literature about abrasive articles, even though it can comprise any materials which are useful for preventing the accumulation of swarf. For example, the anti-adhesion agent can comprise metal salts of fatty acids (for example zinc stearate or calcium stearate), salts of phosphate esters (for example potassium behenyl phosphate), phosphate esters, urea-formaldehyde resins, waxes, mineral oils, crosslinked silanes, crosslinked silicones, fluorinated chemicals and/or combinations thereof as constituent. Such anti-adhesion agents are often produced from fats in which a mixture of fatty acids is present. For example, an anti-adhesion agent—which is referred to as “stearate” in the literature—can also contain calcium salts of other fatty acids, for example palmitate, myristate or laurate. It is pointed out that such anti-adhesion agents are known to a person skilled in the art, for example from U.S. Pat. No. 5,766,277 B. The anti-adhesion agent typically does not dissolve in the dispersion medium of the release agent dispersion (for example water), so that a release agent dispersion containing the anti-adhesion agent is present. In this case, anti-adhesion agent particles, in particular very fine anti-adhesion agents particles, “float” in the dispersion medium of the release agent dispersion. In this sense, the anti-adhesion agent or the anti-adhesion agent particles is/are present as fine, essentially insoluble particles in the dispersion medium of the release agent dispersion.
- According to the invention, the release agent dispersion comprises at least one film-forming agent, in particular a filming agent and/or a gap filling agent. According to the invention, the film-forming agent can be utilized to treat an abrasive article in such a way that no strips or streaks remain on its surface as residue of a coating with the anti-adhesion agent.
- A “film-forming agent” refers to a substance which is suitable and is in particular also provided for producing bonding of individual anti-adhesion agent particles to the surface of the abrasive article and/or to close gaps between individual anti-adhesion agent particles on the surface of the abrasive article. This makes it possible to produce a layer, in particular uniform layer, or a film, in particular uniform film—the covering layer according to the invention—from the many individual anti-adhesion agent particles applied to the surface of the abrasive article. The covering layer advantageously no longer has individual anti-adhesion agent particles capable of refraction of light. In other words, no light-refracting residues which lead—depending on the position on the surface of the abrasive article—to a nonuniform or inhomogeneous appearance (such as for example streaks or strips on the surface) remain on the surface of the abrasive article after carrying out the method of the invention. Thus, a uniform covering layer which appears optically transparent (or in some cases also translucent) through to optically slightly opaque is produced on the surface of the abrasive article. In particular, a covering layer having—depending on the position on the surface of the abrasive article—a uniform or homogeneous refractive index is made possible.
- On the basis of present-day knowledge, the production of a uniform film which appears optically transparent through to optically slightly opaque appears to be possible by means of partial dissolution and joining of neighboring anti-adhesion agent particles and/or by filling-up of gaps between neighboring anti-adhesion agent particles. A film-forming agent which brings about partial dissolution and joining of (two or more) neighboring anti-adhesion agent particles will in the context of the present text be referred to as “filming agent”. In particular, the filming agent brings about adhesive bonding and filming (i.e. film formation) of adjacent anti-adhesion agent particles. In particular, this partial dissolution, joining, adhesive bonding (may also be characterized as melting) and/or filming of adjacent anti-adhesion agent particles is made possible at advantageously low temperatures in the range from 0° C. to 100° C., in particular from 15° C. to 80° C., very particularly from 30° C. to 60° C. The filming agent thus acts in a manner analogous to an adhesive which partially dissolves the materials of objects to be joined in the surface region and subsequently dries. As a distinction from a filming agent, a film-forming agent which brings about the filling of gaps between neighboring anti-adhesion agent particles will be referred to as “gap filler”. A gap filler advantageously has a refractive index similar to that of the anti-adhesion agent particles, so that no or only very little refraction of light occurs at the places filled with gap filler between adjacent anti-adhesion agent particles and the gap filler thus likewise serves to produce an optically transparent (or sometimes also translucent) but homogeneous covering layer.
- In one embodiment of the method, the film-forming agent comprises at least one constituent which is suitable for partially dissolving anti-adhesion agent particles. The constituent can, for example, be selected from a list, where the list comprises at least organic acids, alcohols, amines, phosphanes, lactic acid, acetic acid, salts of lactic acid, salts of acetic acid, in particular ammonium salts of lactic acid (ammonium lactate) or ammonium salts of acetic acid (ammonium acetate), polyethylenimine, polyethylene glycol, urea and mixtures thereof. Polyethylenimine in particular has good properties as film-forming agent, in particular as filming agent, since it becomes solid and does not diffuse after treatment of the abrasive article, in particular does not diffuse into the abrasive article. Polyethylene glycol has been found to be an advantageous gap filler. Urea, which is partially dissolved by one of the abovementioned film-forming agents, is likewise suitable as good gap filler.
- In an embodiment of the method, the release agent dispersion contains at least one surfactant. Surfactants which are able to achieve good leveling, i.e. good spread, of the release agent dispersion on the surface of the abrasive article while the abrasive article is being treated in the method of the invention are particularly suitable. A surfactant leads to an advantageous equalization of amounts of release agent dispersion applied to the surface if the release agent dispersion is not applied homogeneously over the surface (self-leveling). This equalization occurs by flow of the release agent dispersion.
- In an embodiment of the method, the release agent dispersion is applied to the surface of the abrasive article at a temperature of the abrasive article in the range from 0° C. to 100° C., in particular from 15° C. to 80° C., very particularly from 30° C. to 60° C. In particular, a temperature of above 0° C. leads to evaporation of the dispersion medium water, with the anti-adhesion agent and the film-forming agent remaining on the surface of the abrasive article—where a gap filler fills gaps between anti-adhesion agent particles and/or a filming agent partially dissolves and joins adjacent anti-adhesion agent particles—and the optically homogeneous covering layer being formed in this way. The higher the temperature selected, the more quickly does evaporation of the dispersion medium occur. On the other hand, heating of the abrasive article to a high temperature is costly and complicated in terms of manufacturing technology. In one embodiment of the method, the release agent dispersion is applied to the surface of the abrasive article during the production process of the abrasive article, in particular after a process step of heating the abrasive article, very particularly before a process step for cooling the abrasive article. Accordingly, it is sufficient in order to maintain the proposed temperatures to treat the abrasive article in the still-hot state during or immediately after manufacture thereof—during which heating to typically above 70-140° C. is carried out in order to cure the binder. Here, heating means heating of the abrasive article to significantly above room temperature, i.e. above 30° C., in particular above 50° C., very particularly above 70° C. According to the invention, residual heat still present in the abrasive article can be utilized and it is not necessary to reheat the abrasive article in a heating oven in a (further) process step of after-treatment. Here, “production process” means the sequence of process steps which serve to manufacture and provide the abrasive article. In an embodiment, these process steps can be formed by (1) application of base binder to an abrasive article substrate, (2) sprinkling of abrasive grains onto the abrasive article substrate covered with base binder, (3) curing of the base binder, (4) application of a covering binder, (5) drying and/or curing of the resulting abrasive article by heating of the abrasive article, (6) cooling of the abrasive article and (7) finishing (stamping or laser cutting) of the abrasive article. According to the invention, the release agent dispersion can be applied to the surface of the abrasive article during the production process of the abrasive article, in particular after the process step (5) of heating to effect drying and/or curing of the abrasive article (also: drying process step), very particularly before the cooling process step (6) for the dried/cured abrasive article and the residual heat present in the abrasive article can be utilized in this way. Furthermore, the method of the invention can be integrated in this way into an existing process chain of the production process and a corresponding process facility, for example into an existing manufacturing plant, without further, in particular complicated, machines or restructuring being necessary in the process chain and/or process facility. In particular, no separate heating oven is therefore required and/or no double utilization of an existing heating oven for drying/curing (in process step (5)) and for later reheating in order to treat the abrasive article is necessary for carrying out the method. In one embodiment, the release agent dispersion can be applied directly “in-line” onto an abrasive article stock strip (referred as stock strip) moving through a manufacturing plant and which has previously been heated for drying and curing of the binder, with the dispersion medium water of the release agent dispersion evaporating and filming of the surface occurring to form the covering layer.
- Furthermore, the covering layer produced by application of the release agent dispersion to the surface of the abrasive article can be dried in the process step for cooling the abrasive article by means of an air stream in such an embodiment of the method. Here, the cooling effect exerted on the abrasive article is reinforced and drying of the covering layer is at the same time accelerated.
- The release agent dispersion can be applied to the surface of the abrasive article by means of doctor blade coating, rolling-on, printing, brushing or the like. In one embodiment of the method, the release agent dispersion is applied to the surface of the abrasive article by means of pulsed spraying. Pulsed spraying—i.e. repeated spraying with brief interruptions (intermittent spraying)—assists metering because the pressure and, associated therewith, droplet formation of the release agent dispersion applied to the surface of the abrasive article remain constant. Furthermore, the amount of release agent dispersion sprayed on can be altered in a simple way by varying the opening time of the spray valve (for example by changing the opening time from 10 milliseconds to 50 milliseconds per impulse). In particular, an otherwise necessary cleaning of adhesive boat and application roller(s) can be avoided in the cleaner process operation of spraying compared to a rolling of a solution onto the surface of the abrasive article as is known from the prior art.
- In an embodiment of the method, the release agent dispersion has a solids content in the range from 20% to 60%, in particular from 25% to 50%, very particularly from 30% to 40%. The values according to the invention are advantageous solids contents for processing the release agent dispersion. A particularly high solids content makes it possible to achieve a high density of anti-adhesion agent particles sprayed on the surface of the abrasive article. On the other hand, a low solids content (i.e. a low-viscosity or fluid property) allows particularly good meterability and processability by means of the spray valves (spray nozzles), because these do not block. Furthermore, a release agent dispersion having a low solids content which has been sprayed onto the surface can distribute more readily on or over the surface (by flowing). In one embodiment, the solids content can be 33%.
- The invention also provides an abrasive article which has been treated by a method according to the invention.
- The invention is explained in more detail in the following description on the basis of embodiments depicted in the drawings. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will also advantageously look at the features individually and assemble them to give useful further combinations. Identical reference numerals in the figures denote identical elements.
- The figures show:
-
FIG. 1 a part of an illustrative embodiment of an abrasive article according to the invention with abrasive grains in a schematic sectional view; -
FIG. 2 a process flow diagram for depicting the method of the invention for treating an abrasive article; -
FIG. 3 a process flow diagram for depicting an illustrative integration of the method of the invention as perFIG. 2 into a manufacturing process for an abrasive article. -
FIG. 1 shows a part of an illustrative embodiment of anabrasive article 10 according to the invention withabrasive grains 12 in a schematic sectional view. In the embodiment depicted, theabrasive article 10 is a coatedabrasive article 10 having an abrasive article substrate made of vulcanized fiber. The abrasive article substrate 22 made of vulcanized fiber serves as flexible substrate for theabrasive grains 12. Vulcanized fiber is a composite material composed of cellulose, in particular cotton or cellulose fibers, and is adequately known to a person skilled in the art as flexible substrate for abrasive articles from the prior art. Theabrasive grains 12 are fastened by means of a binder 20, in particular a base binder 24, in the form of, for example, phenolic resin, to the abrasive article substrate 22. The layer of base binder 24 andabrasive grains 12 is additionally coated with a covering binder 26 (the covering binder 26 likewise represents a binder 20), in particular likewise composed of phenolic resin. - The
abrasive article 10 has been treated by the method according to the invention for treating anabrasive article 10, by afurther covering layer 30 being applied to thesurface 28 intended for grinding of theabrasive article 10. The application of thecovering layer 30 is carried out by use of themethod 100 according to the invention, cf.FIG. 2 . -
FIG. 2 shows a process flow diagram to depict an embodiment of themethod 100 according to the invention for treating anabrasive article 10, with a release agent dispersion for producing acovering layer 30 being applied to at least onesurface 28 of theabrasive article 10 in the treatment of theabrasive article 10. - In a
first method step 102, a release agent dispersion comprising at least one anti-adhesion agent is provided. In this embodiment, the release agent dispersion further comprises a surfactant. This release agent dispersion here comprises, for example, water as dispersion medium, a stearate, in particular a calcium stearate, as anti-adhesion agent. The release agent dispersion here has a solids content in the range from 30% to 40%, for example 35%. - In
method step 104, the release agent dispersion provided is admixed with at least one film-forming agent. Admixing is carried out, in particular, by blending or stirring the mixture of release agent dispersion and film-forming agent. The film-forming agent comprises, in particular, a filming agent and/or a gap filler. In an embodiment, the film-forming agent is a mixture of lactic acid and polyethylene glycol. Inmethod step 106, the release agent dispersion which has been admixed with the film-forming agent is applied to the at least onesurface 28 of theabrasive article 10. Application is carried out in this embodiment by pulsed spraying onto thesurface 28 of theabrasive article 10 using at least one atomizer nozzle (not shown in more detail here). The pulsed spraying is carried out here by repeated intermittent spraying at an average frequency of 20 Hz, with valve opening times of about 20 milliseconds. -
FIG. 3 shows a process flow diagram to depict an exemplary integration of themethod 100 according to the invention as perFIG. 2 into amanufacturing process 200 for anabrasive article 10. Themanufacturing process 200 comprises at least the following process steps. - In
process step 202, an abrasive article substrate 22, for example composed of vulcanized fiber, is provided. Inprocess step 204, a base binder 24 is applied to the abrasive article substrate 22, for example by doctor blade coating or rolling-on. Inprocess step 206, abrasive grains are sprinkled, for example by means of electrostatic sprinkling as is known from the prior art, onto the abrasive article substrate 22 which has been covered with base binder. Inprocess step 208, the base binder 24 is firstly cured and subsequently coated inprocess step 210 with a covering binder 26, in particular by rolling-on or brushing-on. Inprocess step 212, theabrasive article 10 obtained in this way is dried/cured (in particular the covering binder 26 is also cured) by conveying it through a heating oven and thus heating it. The heating oven is, for example, heated to 120° C. In parallel to these process steps 202 to 212, the method steps of themethod 100 according to the invention can be carried out, in particular carrying out the method steps 102 to 104, as depicted inFIG. 3 (as an alternative, these method steps 102 to 104 can also be carried out before or after the process steps 202 to 212 are carried out). After heating and drying/curing theabrasive article 10 inprocess step 212, the release agent dispersion is applied to thesurface 28 intended for grinding of theabrasive article 10 in process step 214, i.e.method step 106 of the process ofFIG. 2 is carried out. At this point in time, the release agent dispersion comprises at least one anti-adhesion agent and a film-forming agent, optionally a surfactant. At the point in time of application of the release agent dispersion, theabrasive article 10 has a temperature of about 50° C. As described, application is carried out by means of pulsed spraying (cf. above in respect of method step 106). Thecovering layer 30 produced by application of the release agent dispersion to thesurface 28 of theabrasive article 10 is dried by means of an air stream in aprocess step 216 for cooling (cooling process step) the still hotabrasive article 10, with the still hotabrasive article 10 being cooled at the same time and the dispersion medium water of the release agent dispersion applied to the surface evaporating at the same time. As a result of the residual heat, the film-forming agents, i.e. the gap filler and the filming agent, react and form an optically homogeneous, i.e. streak-free, covering layer. Finally, theabrasive article 10 obtained in this way can be finished, for example by stamping or laser cutting, inprocess step 218.
Claims (10)
1. A method for treating an abrasive article, comprising:
applying a release agent dispersion at least to a surface of the abrasive article in order to produce a covering layer,
wherein the surface is configured for grinding,
wherein the release agent dispersion comprises at least one anti-adhesion agent, and
wherein the release agent dispersion further comprises at least one film-forming agent.
2. The method as claimed in claim 1 , wherein the release agent dispersion further comprises at least one surfactant.
3. The method as claimed in claim 1 , wherein applying the release agent dispersion comprises:
applying the release agent dispersion to the surface of the abrasive article at a temperature of the abrasive article in a range from 0° C. to 100° C.
4. The method as claimed in claim 1 , wherein the release agent dispersion has a solids content in a range from 20% to 60%.
5. The method as claimed in claim 1 , wherein applying the release agent dispersion comprises:
applying the release agent dispersion to the surface of the abrasive article using pulsed spraying.
6. The method as claimed in claim 1 , wherein applying the release agent dispersion comprises:
applying the release agent dispersion to the surface of the abrasive article during a production process for the abrasive article, after a process step for heating the abrasive article, and before a process step for cooling the abrasive article.
7. The method as claimed in claim 1 , further comprising:
drying the covering layer using an air stream in a process step for cooling the abrasive article.
8. An abrasive article, comprising:
a surface configured for grinding,
a covering layer configured to cover the surface, the covering layer formed by applying a release agent dispersion to the surface, the release agent dispersion comprising (i) at least one anti-adhesion agent, and (ii) at least one film-forming agent.
9. The abrasive article as claimed in claim 8 , wherein the film-forming agent is a filming agent and/or a gap filler.
10. The abrasive article as claimed in claim 1 , wherein the film-forming agent is a filming agent and/or a gap filler.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018220672.4 | 2018-11-30 | ||
DE102018220672.4A DE102018220672A1 (en) | 2018-11-30 | 2018-11-30 | Process for treating an abrasive article and abrasive article |
PCT/EP2019/081588 WO2020109042A1 (en) | 2018-11-30 | 2019-11-18 | Method for treating an abrasive article, and abrasive article |
Publications (1)
Publication Number | Publication Date |
---|---|
US20220193865A1 true US20220193865A1 (en) | 2022-06-23 |
Family
ID=68618151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/298,161 Pending US20220193865A1 (en) | 2018-11-30 | 2019-11-18 | Method for Treating an Abrasive Article, and Abrasive Article |
Country Status (5)
Country | Link |
---|---|
US (1) | US20220193865A1 (en) |
EP (1) | EP3887094B1 (en) |
CN (1) | CN113365783B (en) |
DE (1) | DE102018220672A1 (en) |
WO (1) | WO2020109042A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD1016110S1 (en) * | 2021-09-01 | 2024-02-27 | Tokyo Diamond Tools Mfg. Co., Ltd. | Rotary disc grinding stone |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020209520A1 (en) | 2020-07-29 | 2022-02-03 | Robert Bosch Gesellschaft mit beschränkter Haftung | Method of treating an abrasive article and abrasive article |
DE102020209521A1 (en) * | 2020-07-29 | 2022-02-03 | Robert Bosch Gesellschaft mit beschränkter Haftung | Method of making a structured abrasive article and abrasive article |
EP3960370A1 (en) * | 2020-08-31 | 2022-03-02 | Hermes Schleifmittel GmbH | Method for applying an agent coating to an abrasive tool |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2768886A (en) | 1954-06-29 | 1956-10-30 | Norton Co | Sandpaper |
US4988554A (en) * | 1989-06-23 | 1991-01-29 | Minnesota Mining And Manufacturing Company | Abrasive article coated with a lithium salt of a fatty acid |
EP0912295A1 (en) * | 1996-05-08 | 1999-05-06 | Minnesota Mining And Manufacturing Company | Abrasive article comprising an antiloading component |
US5766277A (en) | 1996-09-20 | 1998-06-16 | Minnesota Mining And Manufacturing Company | Coated abrasive article and method of making same |
US6261682B1 (en) * | 1998-06-30 | 2001-07-17 | 3M Innovative Properties | Abrasive articles including an antiloading composition |
FR2820666B1 (en) * | 2001-02-14 | 2003-04-11 | Arjo Wiggins Sa | SELF-GRIPPING SUPPORT FOR AN APPLIED ABRASIVE PRODUCT AND METHOD FOR MANUFACTURING SAID ABRASIVE PRODUCT INCORPORATING THE SAME |
JP2008266397A (en) * | 2007-04-18 | 2008-11-06 | Three M Innovative Properties Co | Clogging prevention composition for abrasive material and abrasive material having clogging prevention film |
US10759023B2 (en) * | 2015-12-30 | 2020-09-01 | 3M Innovative Properties Company | Abrasive articles and related methods |
-
2018
- 2018-11-30 DE DE102018220672.4A patent/DE102018220672A1/en active Pending
-
2019
- 2019-11-18 WO PCT/EP2019/081588 patent/WO2020109042A1/en unknown
- 2019-11-18 US US17/298,161 patent/US20220193865A1/en active Pending
- 2019-11-18 CN CN201980090870.3A patent/CN113365783B/en active Active
- 2019-11-18 EP EP19805949.5A patent/EP3887094B1/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD1016110S1 (en) * | 2021-09-01 | 2024-02-27 | Tokyo Diamond Tools Mfg. Co., Ltd. | Rotary disc grinding stone |
Also Published As
Publication number | Publication date |
---|---|
WO2020109042A1 (en) | 2020-06-04 |
CN113365783A (en) | 2021-09-07 |
EP3887094A1 (en) | 2021-10-06 |
EP3887094B1 (en) | 2022-10-26 |
DE102018220672A1 (en) | 2020-06-04 |
CN113365783B (en) | 2023-10-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20220193865A1 (en) | Method for Treating an Abrasive Article, and Abrasive Article | |
CN112105705B (en) | Abrasive article including soft shaped abrasive particles | |
TWI343854B (en) | High-performance resin for abrasive products | |
JP4150078B2 (en) | Method for producing porous polishing product | |
TWI385052B (en) | Methods and tool for maintenance of hard surfaces, and a method for manufacturing such a tool | |
JP6637431B2 (en) | Abrasive article and method of using the same | |
US20160074998A1 (en) | Polymer impregnated backing material, abrasive articles incorporating same, and processes of making and using | |
CN105793369B (en) | Wiper blade rubber smears and the wiper blade rubber for using the smears | |
US20170198167A1 (en) | Hydrophobic treatment for ski and method | |
CN103374301A (en) | Joining and/or gluing method and products produced according to this method | |
RU2389559C2 (en) | Method to seal surfaces | |
US9358669B2 (en) | High adhesion resin-mineral systems | |
CN101422880A (en) | Polishing head for repairing and polishing the high light plastic surface and method thereof | |
CN101883801A (en) | Alkanolamine-modified phenolic resin formulation and the coating that is used for abrasive product | |
US20130189911A1 (en) | Abrasive products and methods for finishing coated surfaces | |
CA2508067C (en) | A method of fabricating a iron-on interlining, and a iron-on interlining obtained thereby | |
KR100597898B1 (en) | A process for the manufacture of soft tipped blades | |
US4821400A (en) | Method of making brake shoe stock | |
CN103254837A (en) | Novel anti-skid adhesive tape | |
CN104139345B (en) | Wear-resisting grinding tool with thin film base and manufacturing method of wear-resisting grinding tool | |
CN108430702A (en) | Abrasive product and preparation method thereof | |
CN103653548A (en) | Technique for using powder binder during gluing of footwear component | |
CN101386773B (en) | Aircraft plastics repair | |
US4969251A (en) | Method of making brake shoe stock (II) | |
US3635194A (en) | High-production machine utilizing spray masks |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HUBER, JOHANNES;REEL/FRAME:056853/0687 Effective date: 20210709 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |