EP3887094A1 - Procédé de traitement d'un article abrasif et article abrasif - Google Patents

Procédé de traitement d'un article abrasif et article abrasif

Info

Publication number
EP3887094A1
EP3887094A1 EP19805949.5A EP19805949A EP3887094A1 EP 3887094 A1 EP3887094 A1 EP 3887094A1 EP 19805949 A EP19805949 A EP 19805949A EP 3887094 A1 EP3887094 A1 EP 3887094A1
Authority
EP
European Patent Office
Prior art keywords
abrasive article
release agent
agent dispersion
abrasive
dispersion
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.)
Granted
Application number
EP19805949.5A
Other languages
German (de)
English (en)
Other versions
EP3887094B1 (fr
Inventor
Johannes Huber
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3887094A1 publication Critical patent/EP3887094A1/fr
Application granted granted Critical
Publication of EP3887094B1 publication Critical patent/EP3887094B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B24D3/34—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, a release agent dispersion for producing a cover layer being applied to at least one surface of the abrasive article intended for grinding, where the release agent dispersion has at least one non-stick agent.
  • the invention further relates to a corresponding abrasive article.
  • the invention relates to a method for treating an abrasive article, in particular a coated abrasive article, wherein a release agent dispersion for producing a cover layer is applied to at least one surface of the abrasive article intended for grinding, the release agent dispersion having at least one non-stick agent.
  • a “grinding article” is used for grinding or abrasive machining of a workpiece, in which the material of the workpiece is mechanically removed in the form of chips from the surface of the workpiece.
  • the abrasive article is in particular a coated abrasive article.
  • the abrasive article comprises an, in particular flexible, abrasive article underlay with at least one layer.
  • the abrasive article underlay can in particular be paper, cardboard, vulcanized fiber, foam, a plastic, a textile structure, in particular a fabric, knitted fabric, knitted fabric, braid, fleece, or a combination of these materials, especially paper and fabric, in one or more layers include.
  • The, in particular flexible, abrasive article underlay gives the abrasive article specific properties with regard to adhesion, elongation, tear and tensile strength, flexibility and stability.
  • abrasive grains are fixed on the abrasive article base using a binder (often referred to as a base binder).
  • the abrasive grains are at least pre-fixed, in particular fixed, in particular in a desired position and / or distribution on the abrasive medium base.
  • suitable binders for fixing abrasive grains on the abrasive article base are typically solvent-based adhesives such as polychloroprene.
  • cover binder can be used, which is applied in layers, in particular, to the abrasive grains fixed on the abrasive base by means of the base binder.
  • the cover binder firmly connects the abrasive grains to one another and firmly to the abrasive pad.
  • the skilled worker is particularly well-known ge suitable cover binders from the prior art. Synthetic resins, such as, for example, phenolic resin, epoxy resin, urea resin, melamine resin, polyester resin, are particularly suitable as cover binders.
  • other additives C, grinding additives ”) can be provided to give the abrasive article specific properties. Such additives are known to the expert.
  • abrasive articles are also conceivable in principle, such as bonded abrasive articles.
  • Bonded abrasive articles are, in particular, typically synthetic resin-bonded cutting and grinding discs that are familiar to the expert.
  • resin-bonded cutting and grinding discs a mass is mixed from grinding minerals as well as fillers, powder resin and liquid resin, which are then pressed into cutting and grinding discs in various thicknesses and diameters.
  • the cutting and grinding discs also include fabric layers made of glass fiber. The mass typically cures at approx. 180 ° C.
  • the advantages according to the invention can also be achieved with such abrasive articles.
  • the abrasive article has one intended for grinding, i.e. abrasive surface on, in particular on that side of the abrasive article on which the abrasive grain is fixed and optionally provided with a cover binder and / or another additive.
  • the abrasive surface of the abrasive article is moved over a workpiece to be machined during a grinding process, so that a grinding effect is generated by means of the abrasive grains arranged on the abrasive surface.
  • the abrasive article can exist in different forms, for example as a grinding wheel or as an abrasive belt, as a sheet, roll, strip or also as an abrasive article web (e.g. in the manufacture).
  • a “release agent dispersion” that is applied to the surface of the abrasive article intended for grinding is to be understood in particular as a lubricant dispersion.
  • the release agent dispersion serves to apply the substances contained in the dispersion to the surface of the abrasive article, the substances contained being present as fine, essentially insoluble particles in the dispersion medium (also: dispersant) of the release agent dispersion.
  • the release agent dispersion has water as the dispersion medium.
  • the dispersion medium can also be realized 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 to form a cover layer on the surface.
  • the release agent dispersion has at least one non-stick agent, in particular as a substance contained in the dispersion medium.
  • An “anti-stick agent” is to be understood as an agent preventing or reducing chips accumulating during a grinding process.
  • the non-stick agent serves to prevent or reduce an accumulation of chips in the spaces between adjacent abrasive grains, which in particular can lead to blockage or clogging of the abrasive surface of the abrasive article.
  • the non-stick agent serves to prevent or reduce the effect in which chips sinter, glue or melt together under the heat generated during a grinding process and melt on the abrasive surface of the abrasive article and thus likewise clog or clog the abrasive surface of the Abrasive article leads (as is often the case for example with plastics to be ground, plastic varnishes or the like). This advantageously improves the cutting ability and, in particular, the service life of the abrasive article.
  • the non-stick agent serves as a kind of lubricant between the abrasive article and the workpiece surface to be machined during a grinding process.
  • non-stick agent is often referred to in the literature on abrasive articles as “steraf, although it may include any materials that are useful in preventing chip build-up.
  • the anti-adhesive metal salts of 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
  • urea-formaldehyde resins waxes, mineral oils, cross-linked silanes, cross-linked silicones, fluorochemicals and / or combinations thereof exhibit as part.
  • Such non-stick agents are often made from fetuses containing a mixture of fatty acids.
  • an anti-stick agent - referred to in the literature as "stearate” - can also contain calcium salts of other fatty acids, for example palmitate, myristate or laurate.
  • non-stick agents are known to the person skilled in the art, for example from US Pat. No. 5,766,277 B.
  • the non-stick 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 non-stick agent is present.
  • “Float" especially the finest, non-stick particles in the dispersion medium Release agent dispersion. In this sense, the non-stick agent or the non-stick agent particles are present as fine, essentially insoluble particles in the dispersion medium of the release agent dispersion.
  • the release agent dispersion has at least one film forming agent, in particular a film-forming agent and / or a gap-filling agent.
  • the film-forming agent can be used to treat an abrasive article in such a way that no streaks or streaks remain on its surface as a residue of a coating with the non-stick agent.
  • a “film-forming agent” is understood to mean a substance that is suitable and in particular also intended to establish a connection of individual non-stick particles on the surface of the abrasive article and / or to close gaps between individual non-stick particles on the surface of the abrasive article. In this way, it is possible to produce a, in particular uniform, layer or a, in particular uniform, film from the large number of individual non-stick particles applied to the surface of the abrasive article - the cover layer according to the invention.
  • the cover layer advantageously no longer has individual non-stick particles capable of refraction of light.
  • a film-forming agent that causes the dissolving and bonding (two or more) of neighboring non-stick particles is referred to in this document as a “filming agent”.
  • the filming agent causes bonding and filming (ie film formation) of adjacent anti-adhesive particles.
  • this dissolving, connecting, gluing (also to be characterized as melting) and / or filming of adjacent anti-adhesive particles at advantageously low temperatures between 0 ° C and 100 ° C, in particular between 15 ° C and 80 ° C, very particularly between 30 ° C and 60 ° C allows.
  • the filming agent thus acts in analogy to an adhesive that dissolves the materials of objects to be connected close to the surface and then dries them.
  • a film-forming agent a film-forming agent which causes gaps to be filled between adjacent anti-adhesive particles is referred to as a “gap filler”.
  • a gap filler advantageously has a refractive index similar to that of the anti-adhesive particles, so that there is little or no light refraction at the points filled with gap filler between adjacent anti-adhesive particles and thus the gap filler also produces an optically transparent (or occasionally also translucent), but homogeneous cover layer is used.
  • the film-forming agent has at least one component that is suitable for dissolving anti-adhesive particles.
  • the constituent can, for example, be selected from a list, the list including at least organic acids, alcohols, amines, phosphines, 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 (ammo nium acetate), polyethylene imine, polyethylene glycol, urea and mixtures thereof.
  • Polyethylene imine in particular has good properties as a film-forming agent, in particular as a film-forming agent, since after the treatment of the abrasive article it becomes solid and does not diffuse, in particular does not diffuse into the abrasive article.
  • Polyethylene glycol has proven to be an advantageous gap filler.
  • urea which is dissolved by one of the film-forming agents mentioned, as a good gap filler.
  • the release agent dispersion contains at least one surfactant.
  • surfactants are suitable for achieving a good flow, ie a good spread, of the release agent dispersion on the surface of the abrasive article while the abrasive article is treated in the process according to the invention.
  • a surfactant leads to an advantageous balance 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 compensation takes place by flowing the release agent dispersion.
  • the release agent dispersion is applied to the surface of the abrasive article at a temperature of the abrasive article between 0 ° C and 100 ° C, in particular between 15 ° C and 80 ° C, very particularly between 30 ° C and 60 ° C.
  • a temperature above 0 ° C leads to evaporation of the dispersion medium water, with the non-stick agent and the film-forming agent remaining on the surface of the abrasive article - where a gap filler fills gaps between non-stick agent particles and / or a film-forming agent dissolves and connects neighboring non-stick agent particles - and so on optically homogeneous cover layer is formed.
  • 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 for heating the abrasive article, very particularly before a process step for cooling the abrasive article. Accordingly, it is sufficient to comply with the proposed temperatures to treat the abrasive article during or immediately after its manufacture - in which heating to typically over 70-140 ° C to harden the binder - while still warm.
  • Heating is understood to mean heating of the abrasive article clearly above room temperature, ie above 30 ° C., in particular above 50 ° C., very particularly above 70 ° C. According to the invention, any residual heat still present in the abrasive article can be used and there is no re-heating of the abrasive article in a heating oven in a (further) program. Process step or post-processing step necessary. “Manufacturing process” means the sequence of process steps or process steps that serve to manufacture and provide the abrasive article.
  • these method / process steps can be given by (1) applying base binders to an abrasive article base, (2) sprinkling abrasive grains onto the base binder-covered abrasive base, (3) hardening the base binder, (4) applying a cover binder, (5) drying and / or hardening the abrasive article thus produced while heating the abrasive article, (6) cooling the abrasive article and (7) making up (punching or laser cutting) the abrasive article.
  • the release agent dispersion can be applied to the surface of the during the manufacturing process of the abrasive article, in particular after the heating process step (5) for drying and / or hardening the abrasive article (also: drying process step), very particularly before the cooling process step (6) of the dried / hardened abrasive article Abrasive articles are brought up and so the residual heat in the abrasive article can be used.
  • the method according to the invention can be integrated in such a way into an existing process chain of the manufacturing process and a corresponding process landscape, for example into an existing production plant, without the further, in particular complex, machines or restructuring in the process chain and / or process landscape being necessary.
  • the release agent dispersion can be applied “in-line” directly to a strip of abrasive article (so-called web) which has been heated beforehand to dry and harden the binders and which moves through a production plant, the dispersion medium evaporating water from the release agent dispersion and filming the surface takes place with the formation of the top layer.
  • the cover layer produced by bringing the release agent dispersion onto the surface of the abrasive article can be cooled in the method step for cooling the abrasive article Airflow to be dried.
  • the cooling effect exerted on the abrasive article is increased and at the same time the drying of the surface layer is accelerated.
  • the release agent dispersion can be applied to the surface of the abrasive article by means of doctoring, rolling, printing, pinching or the like.
  • the release agent dispersion is applied to the surface of the abrasive article by means of pulsed spraying.
  • a pulsed spray - i.e. repeated spraying with short interruptions (intermittent spraying) - facilitates the metering because the pressure and thus a droplet formation of the release agent dispersion applied to the surface of the abrasive article remain constant.
  • the amount of sprayed release agent dispersion can be changed in a simple manner by varying the opening time of the spray valve (for example by changing the opening time from 10 milliseconds to 50 milliseconds per pulse).
  • an otherwise necessary cleaning of the glue ship and application roller can be avoided.
  • the release agent dispersion has a solids content of between 20% and 60%, in particular between 25% and 50%, very particularly between 30% and 40%.
  • the values according to the invention represent advantageous solids contents for processing the release agent dispersion.
  • a particularly high solids content makes it possible to achieve a high density of anti-adhesive particles sprayed on the surface of the abrasive article.
  • a low solids content i.e. a low-viscosity or flowable property
  • a release agent dispersion sprayed onto the surface with a low solids content can be better distributed on or over the surface (by bleeding).
  • the solids content can be 33%.
  • the invention further relates to an abrasive article which has been treated by a method according to the invention.
  • FIG. 1 shows a section of an exemplary embodiment of an abrasive article according to the invention with abrasive grains in a schematic sectional illustration
  • FIG. 2 is a process diagram to illustrate the invention
  • Figure 3 is a process diagram showing an exemplary integration of the inventive method of Figure 2 in a manufacturing process of an abrasive article.
  • Figure 1 shows a section of an exemplary embodiment of an inventive abrasive article 10 with abrasive grains 12 in a schematic sectional view.
  • the abrasive article 10 is a coated abrasive article 10 with an abrasive article underlay 22 made of vulcanized fiber.
  • the abrasive article underlay 22 made of vulcanized fiber serves as a flexible underlay for the abrasive grains 12.
  • Vulcanized fiber is a composite material made of cellulose, in particular cotton or cellulose fibers, and is well known to the person skilled in the art as a flexible underlay for abrasive articles from the prior art.
  • the abrasive grains 12 are fastened to the abrasive article base 22 by means of a binder 20, in particular a base binder 24, which is realized, for example, as a phenolic resin.
  • the layer of base binder 24 and abrasive grains 12 is additionally coated with a cover binder 26 (the cover binder 26 also represents a binder 20), in particular also made of phenolic resin.
  • the abrasive article 10 is treated according to the inventive method for treating egg nes abrasive article 10 by another surface layer 30 is applied to the surface 28 of the abrasive article 10 intended for grinding.
  • the cover layer 30 is applied by using the method 100 according to the invention, cf. Figure 2.
  • FIG. 2 shows a method diagram to illustrate an embodiment of the method 100 according to the invention for treating an abrasive article 10, wherein during the treatment of the abrasive article 10 a release agent dispersion for producing a cover layer 30 is applied to at least one surface 28 of the abrasive article 10.
  • a release agent dispersion which has at least one non-stick agent is provided.
  • the release agent dispersion also has a surfactant.
  • This release agent dispersion here has, for example, water as the dispersion medium and a stearate, in particular a calcium stearate, as a non-stick agent.
  • the release agent dispersion has a solids content of between 30% and 40%, for example 35%.
  • step 104 at least one film-forming agent is added to the release agent dispersion provided.
  • the transfer is carried out in particular by mixing or stirring the mixture of release agent dispersion and film-forming agent.
  • the film-forming agent in particular has a film-forming agent and / or a gap filler.
  • the film forming agent is a mixture of lactic acid and polyethylene glycol.
  • the release agent dispersion mixed with the film-forming agent is applied to the at least one surface 28 of the abrasive article 10.
  • the application is carried out by pulsed spraying onto the surface 28 of the abrasive article 10 using at least one atomizing nozzle (not shown in more detail here).
  • FIG. 3 shows a method diagram for illustrating an exemplary integration of the method 100 according to the invention according to FIG. 2 into a manufacturing process 200 of an abrasive article 10.
  • the manufacturing process 200 comprises at least the following method steps.
  • an abrasive article base 22 for example made of vulcanized fiber, is provided.
  • a base binder 24 is applied to the abrasive article base 22, for example knife-coated or rolled up.
  • abrasive grains are sprinkled onto the base binder-covered abrasive article base 22, for example by means of electrostatic scattering, as is known from the prior art.
  • the base binder 24 is first hardened and then coated in method step 210 with a cover binder 26, in particular by rolling or brushing.
  • method step 212 the abrasive article 10 realized in this way is dried / hardened (in particular the cover binder 26 is also hardened) by passing it through a heating furnace and heating it up in the process.
  • the heater is heated to 120 ° C, for example.
  • method steps of method 100 according to the invention can be carried out, in particular method steps 102 to 104, as shown in FIG. 3 (alternatively, method steps 102 to 104 can also be carried out before or after Steps 202 to 212 are carried out).
  • the separating agent dispersion is applied in method step 214 to the surface 28 of the abrasive article 10 intended for grinding, ie the method step 106 of the method from FIG. 2 is carried out
  • the release agent dispersion comprises at least one non-stick agent and one film-forming agent, optionally a surfactant.
  • the abrasive article 10 has a temperature of approximately 50 ° C. As described, the application takes place by means of pulsed spraying (cf. method step 106 above).
  • the cover layer 30 generated by applying the release agent dispersion to the surface 28 of the abrasive article 10 is dried in a process step 216 for cooling (cooling process step) the still warm abrasive article 10 with an air stream, at the same time the still warm one Abrasive article 10 is cooled and at the same time the dispersion medium water of the release agent dispersion applied to the surface evaporates. Due to the residual heat, the film-forming agents, ie the gap filler and the filming agent, act and form an optically homogeneous, ie streak-free top layer. Finally, the abrasive article 10 realized in this way can be assembled in method step 218, for example by punching or laser cutting.

Landscapes

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

Abstract

L'invention concerne un procédé de traitement d'un article abrasif (10). Une dispersion d'agent de séparation destinée à générer une couche de revêtement (30) est appliquée sur au moins une surface (28) de l'article abrasif (10) qui est destinée au meulage. La dispersion d'agent de séparation comporte au moins un agent antiadhésif. Selon l'invention, la dispersion d'agent de séparation comprend en outre au moins un agent filmogène. L'invention concerne en outre un article abrasif (10) produit de manière correspondante.
EP19805949.5A 2018-11-30 2019-11-18 Procédé de traitement d'un article abrasif et article abrasif Active EP3887094B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018220672.4A DE102018220672A1 (de) 2018-11-30 2018-11-30 Verfahren zur Behandlung eines Schleifartikels sowie Schleifartikel
PCT/EP2019/081588 WO2020109042A1 (fr) 2018-11-30 2019-11-18 Procédé de traitement d'un article abrasif et article abrasif

Publications (2)

Publication Number Publication Date
EP3887094A1 true EP3887094A1 (fr) 2021-10-06
EP3887094B1 EP3887094B1 (fr) 2022-10-26

Family

ID=68618151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19805949.5A Active EP3887094B1 (fr) 2018-11-30 2019-11-18 Procédé de traitement d'un article abrasif et article abrasif

Country Status (5)

Country Link
US (1) US20220193865A1 (fr)
EP (1) EP3887094B1 (fr)
CN (1) CN113365783B (fr)
DE (1) DE102018220672A1 (fr)
WO (1) WO2020109042A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020209521A1 (de) * 2020-07-29 2022-02-03 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zur Herstellung eines strukturierten Schleifartikels sowie Schleifartikel
DE102020209520A1 (de) 2020-07-29 2022-02-03 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zur Behandlung eines Schleifartikels sowie Schleifartikel
EP3960370A1 (fr) * 2020-08-31 2022-03-02 Hermes Schleifmittel GmbH Procédé d'application d'un revêtement de substance active sur un abrasif
USD1016110S1 (en) * 2021-09-01 2024-02-27 Tokyo Diamond Tools Mfg. Co., Ltd. Rotary disc grinding stone

Family Cites Families (8)

* Cited by examiner, † Cited by third party
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
AU2079597A (en) * 1996-05-08 1997-11-26 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 (fr) * 2001-02-14 2003-04-11 Arjo Wiggins Sa Support autoagrippant pour un produit abrasif applique et procede de fabrication dudit produit abrasif l'incorporant
JP2008266397A (ja) * 2007-04-18 2008-11-06 Three M Innovative Properties Co 研磨材用目詰まり防止組成物及び目詰まり防止皮膜を有する研磨材
CN108430699B (zh) * 2015-12-30 2023-06-23 3M创新有限公司 磨料制品和相关方法

Also Published As

Publication number Publication date
CN113365783B (zh) 2023-10-20
WO2020109042A1 (fr) 2020-06-04
EP3887094B1 (fr) 2022-10-26
DE102018220672A1 (de) 2020-06-04
US20220193865A1 (en) 2022-06-23
CN113365783A (zh) 2021-09-07

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