+

WO1995005267A1 - Silicates de metaux alcalins comme agents de grenaillage a sec hydrosolubles - Google Patents

Silicates de metaux alcalins comme agents de grenaillage a sec hydrosolubles Download PDF

Info

Publication number
WO1995005267A1
WO1995005267A1 PCT/EP1994/002646 EP9402646W WO9505267A1 WO 1995005267 A1 WO1995005267 A1 WO 1995005267A1 EP 9402646 W EP9402646 W EP 9402646W WO 9505267 A1 WO9505267 A1 WO 9505267A1
Authority
WO
WIPO (PCT)
Prior art keywords
silicates
alkali metal
use according
blasting
water
Prior art date
Application number
PCT/EP1994/002646
Other languages
German (de)
English (en)
Inventor
Gerhard Rehm
Jürgen Geke
Original Assignee
Henkel Kommanditgesellschaft Auf Aktien
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 Henkel Kommanditgesellschaft Auf Aktien filed Critical Henkel Kommanditgesellschaft Auf Aktien
Priority to EP94926171A priority Critical patent/EP0714339A1/fr
Publication of WO1995005267A1 publication Critical patent/WO1995005267A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • B24C11/005—Selection of abrasive materials or additives for abrasive blasts of additives, e.g. anti-corrosive or disinfecting agents in solid, liquid or gaseous form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts

Definitions

  • Alkali metal silicates as water-soluble dry abrasives
  • the invention relates to the use of alkali metal silicates as water-soluble blasting media for dry blasting of surfaces.
  • the cleaning of surfaces by blasting with abrasive particles is a technically well-established process.
  • the processes can be divided into wet and dry blasting processes.
  • wet blasting a liquid, usually water, is directed alone or with solid particles suspended therein under pressure onto the surface to be cleaned.
  • dry blasting the abrasive particles are usually shot onto the surface to be treated in a gas stream, usually air, which emerges from a nozzle under pressure.
  • a carrier gas flow can be dispensed with if the blasting agent is accelerated by mechanical force, for example by centrifugal force.
  • the aim of blasting surfaces is to free the surfaces from adhering coatings, such as paints, corrosion products, sealing materials, oil, coal and other combustion residues.
  • the coverings should be removed effectively, but the surfaces themselves should be damaged as little as possible. This works particularly well if the hardness of the blasting medium is between the hardness of the substrate and the lower hardness of the coverings. Accordingly, suitable blasting methods and abrasives will be selected depending on the hardness of the coverings and the surfaces.
  • a compilation of common abrasives, blasting methods and components of blasting devices can be found in: "Metal Finishing", 59th Guidebook Directory Issue 1991, Volume 89, No. 1A, pages 64 to 72.
  • the blasting media can generally be divided into water-soluble and water-insoluble blasting media.
  • Typical water-insoluble abrasives are sand, glass balls, metal grains, aluminum oxide, or softer organic materials, such as ground nut shells. These water-insoluble abrasives have the disadvantage that they can adhere to recesses, such as boreholes, on complicatedly shaped surfaces, from which they cannot be removed again. This is particularly critical when the blasted parts are to be assembled into movable structural units, such as motors or gears. Abrasive residues can then hinder the functionality of the components.
  • blasting media that volatilize themselves after use. Examples of this are blasting with ice or dry ice grains.
  • these abrasives meet the requirements for freedom from residues, they have the disadvantage that converting the abrasive, which is liquid or gaseous under normal conditions, to the solid state requires a high expenditure of energy.
  • This also applies to the blasting agent dry ice: although this solidifies in part when it emerges from a nozzle, the energy required to cool down to the solidification point is applied in that part of the compressed ice Carbon dioxide is expanded to normal pressure and is thereby lost as an abrasive.
  • water-soluble blasting agents are preferably used.
  • a number of requirements must be made of suitable water-soluble abrasives. They must have the correct hardness for the respective blasting material, must not tend to cake and in particular must not cause any signs of corrosion on the irradiated, for example metallic, surfaces. Such conditions severely restrict the selection of available water-soluble abrasives.
  • US-A-5 112 406 describes the use of sodium sulfate as a water-soluble abrasive.
  • the size of the salt particles should be between 50 and 100 ⁇ .
  • the salt particles can be coated with hydrophobic silica or with hydrophobic polysiloxane.
  • WO 91/15308 describes the use of crystalline sodium bicarbonate as a blasting agent, the average particle diameter should be between 100 and 500 ⁇ m, and the particles can also be coated with hydrophobic silica.
  • Urea (GB-A-2 119 298) or glass-like polysaccharide (DE-A-40 13074), for example, are proposed as water-soluble organic blasting agents.
  • a suitable blasting medium is particularly critical if the blasted surfaces are reactive and tend to corrode. This is for example in the case of components Aluminum or magnesium the case. In such cases, the blasting agent must not only have the hardness suitable for the particular combination of surface covering and substrate, but also have anticorrosive properties at the same time.
  • the present invention is based on the object of a new abrasive for dry blasting surfaces, in particular metallic surfaces, preferably surfaces made of iron, copper, zinc, titanium, magnesium, aluminum and their alloys, which are particularly contaminated with sealing materials, adhesive residues , Paints and varnishes, corrosion products, lubricant residues or combustion residues.
  • the blasting center1 must not lead to corrosion of the blasted surfaces and must be easily removable from depressions such as blind holes and bores by aqueous cleaning.
  • alkali metal silicates as water-soluble blasting media for dry blasting of surfaces.
  • Alkali metal silicates are used which are selected from one or more of the groups a) lithium silicates, b) sodium silicates, c) potassium silicates, preferably from the group of sodium silicates.
  • the alkali metal silicates used are preferably X-ray amorphous. This means that they do not produce sharp reflections in X-ray diffraction experiments, which indicates the absence of a crystalline structure.
  • the water-soluble abrasives used are those which contain sodium silicate as the only silicate and this in X-ray amorphous form.
  • Sodium silicates are particularly suitable, the one Composition 60 to 65 wt .-% SiÜ2, 17 to 21 wt .-% Na2 ⁇ and 23 to 14 wt .-% H2O.
  • alkali metal silicates When using alkali metal silicates according to the invention, use is made of the known property of soluble silicates to have a corrosion-inhibiting effect on metallic surfaces. Because of these corrosion-inhibiting properties and the known dispersibility for dirt in aqueous liquors, soluble silicates are a common component of detergents and cleaning agents. In this case, they develop their action in aqueous solution, so that this use in detergents and cleaning agents has no relation to the use for dry blasting surfaces.
  • WO 93/06950 describes a process for stripping paint from aluminum surface, in which an aqueous solution of sodium silicate is used in addition to solid particles of metal hydrogen carbonate.
  • GB-B-1 538 433 describes a process for cleaning surfaces by wet blasting with a high-pressure water jet, in which at least partially water-soluble sodium silicate is added to the water jet. The cleaning action is based above all on the water jet, the sodium silicate being used to support the cleaning action. This does not anticipate or suggest the use of water-soluble sodium silicates as dry abrasives according to the invention.
  • alkali metal silicates are particularly suitable for use as water-soluble abrasives for dry blasting of surfaces, which at least 80% by weight consist of grains with a diameter of ⁇ 0.4 mm, preferably ⁇ 0.2 mm. On the other hand, at least 80% by weight of the alkali metal silicates to be used should consist of grains with a diameter> 0.05 mm.
  • Alkali metal silicates suitable for use as water-soluble abrasives for dry blasting surfaces are known as such in the art. This includes, for example, products that are obtained by spray drying soda water glass solutions. They are used, for example, as components of detergents and cleaners, on the one hand, their properties as alkaline builders, ie. H. the dirt dispersing and carrying capacity, on the other hand their corrosion-inhibiting properties can be exploited.
  • the use of pure alkali metal silicates as water-soluble abrasives for dry blasting of surfaces is preferred.
  • “Pure” is to be understood here as meaning that no further foreign phases are added to the alkali metal silicates, but that these silicates may have impurities due to the production process. If desired, for example to meet certain hardness requirements, it is possible, however, to combine the alkali metal silicates with other water-soluble agents for dry blasting known in the prior art. In such cases, the corrosion-inhibiting effect of the silicates is particularly useful.
  • the alkali metal silicates can, for example, be combined with one or more substances selected from d) alkali metal or ammonium sulfate, preferably sodium sulfate, e) Alkali metal or onium hydrogen carbonate, preferably
  • the mechanical properties of the alkali metal silicates and their corrosion-inhibiting action come into play in particular when they are used as water-soluble abrasives for dry blasting of metallic surfaces, preferably surfaces made of iron, copper, zinc, titanium, magnesium or alloys which consist of at least 50% by weight of one of these elements, and in particular of surfaces made of aluminum or an aluminum alloy.
  • metallic surfaces preferably surfaces made of iron, copper, zinc, titanium, magnesium or alloys which consist of at least 50% by weight of one of these elements, and in particular of surfaces made of aluminum or an aluminum alloy.
  • surfaces of used engine, engine, turbine and / or gear parts that is to say aggregates which, after use, are to be dismantled, cleaned and reused.
  • the blasting agent can be easily and completely removed from depressions such as blind holes, bores, threads etc. using aqueous cleaners.
  • the detached blasting agent residues do not lead to a premature exhaustion of the cleaner, but rather contribute to an intensification of the cleaning action due to the known builder properties of soluble silicates.
  • Even if the use of soluble silicates according to the invention is aimed at blasting surfaces susceptible to corrosion, however, use for blasting other substrate materials is also possible. This includes, for example, substrates made of plastics or ceramic materials.
  • the alkali metal silicates can be collected after their use as abrasives and can be used again as abrasives after the separation of fine grains that have broken.
  • a particular advantage of the use according to the invention is that the alkali metal silicates do not have to be discarded as abrasive after use or after they have become unusable, but can be passed on for further use, for example as components for alkaline cleaning baths.
  • alkali metal silicates according to the invention has been tested on used assembly parts made of die-cast aluminum alloy. Examples are gearbox covers with dirt and gasket residues and cylinder heads with coked combustion chambers.
  • a spray-dried water glass (P3-saxin R 5502, Henkel KGaA, Düsseldorf) of the composition was used as the blasting agent
  • the grain size distribution was determined by sieve analysis and was
  • the blasting tests were carried out using a commercial compressed air blasting device (from Sata), which is normally used for sandblasting. After blasting, the blasted parts were washed with a commercially available aqueous neutral detergent. Afterwards, the parts had a perfect metallic appearance with an undamaged surface. No traces of corrosion could be found.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Detergent Compositions (AREA)
  • Paints Or Removers (AREA)

Abstract

Utilisation de silicates de métaux alcalins, en particulier de silicates de sodium amorphes aux rayons X, seuls ou mélangés à des constituants salins ou organiques, comme agents hydrosolubles pour le grenaillage à sec de surfaces, en particulier de surfaces en fer, cuivre, zinc, titane, magnésium, aluminium ou leurs alliages.
PCT/EP1994/002646 1993-08-19 1994-08-10 Silicates de metaux alcalins comme agents de grenaillage a sec hydrosolubles WO1995005267A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94926171A EP0714339A1 (fr) 1993-08-19 1994-08-10 Utilisation des silicates de metaux alcalins comme agents de grenaillage a sec hydrosolubles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4327925.2 1993-08-19
DE19934327925 DE4327925A1 (de) 1993-08-19 1993-08-19 Alkalimetallsilicate als wasserlösliche Trockenstrahlmittel

Publications (1)

Publication Number Publication Date
WO1995005267A1 true WO1995005267A1 (fr) 1995-02-23

Family

ID=6495564

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/002646 WO1995005267A1 (fr) 1993-08-19 1994-08-10 Silicates de metaux alcalins comme agents de grenaillage a sec hydrosolubles

Country Status (3)

Country Link
EP (1) EP0714339A1 (fr)
DE (1) DE4327925A1 (fr)
WO (1) WO1995005267A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6521945B2 (en) 1999-01-19 2003-02-18 Micron Technology, Inc. Method and composite for decreasing charge leakage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020049033A1 (fr) 2018-09-05 2020-03-12 LUTZ, Margot Procédé de traitement de surfaces
DE102019202087A1 (de) * 2019-02-15 2020-08-20 MA-TEC GmbH Verfahren zur Behandlung von Oberflächen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193732A (ja) * 1975-02-15 1976-08-17 Senjokenmazai
JPS5925866A (ja) * 1982-08-03 1984-02-09 C Uyemura & Co Ltd 乾式流動研摩用研摩材料
DD214139A1 (de) * 1983-03-21 1984-10-03 Univ Halle Wittenberg Schleif- und poliermittel
JPS63162881A (ja) * 1986-12-25 1988-07-06 Takeshi Sugano 金属表面化成処理法
EP0396226A2 (fr) * 1989-05-02 1990-11-07 ADM Agri-Industries, Ltd. Sable abrasif de polysaccharide vitreux

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193732A (ja) * 1975-02-15 1976-08-17 Senjokenmazai
JPS5925866A (ja) * 1982-08-03 1984-02-09 C Uyemura & Co Ltd 乾式流動研摩用研摩材料
DD214139A1 (de) * 1983-03-21 1984-10-03 Univ Halle Wittenberg Schleif- und poliermittel
JPS63162881A (ja) * 1986-12-25 1988-07-06 Takeshi Sugano 金属表面化成処理法
EP0396226A2 (fr) * 1989-05-02 1990-11-07 ADM Agri-Industries, Ltd. Sable abrasif de polysaccharide vitreux
DE4013047A1 (de) * 1989-05-02 1990-11-08 Ogilvie Flour Mills Co Ltd Schleifkorn aus glasartigem polysaccharid

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 7640, Derwent World Patents Index; Class MA, AN 76-74591X C40! *
DATABASE WPI Section Ch Week 8412, Derwent World Patents Index; Class ALF, AN 84-071680 C12! *
DATABASE WPI Section Ch Week 8506, Derwent World Patents Index; Class EGL, AN 85-032180 C06! *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 438 (C - 544) 17 November 1988 (1988-11-17) *
See also references of EP0714339A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6521945B2 (en) 1999-01-19 2003-02-18 Micron Technology, Inc. Method and composite for decreasing charge leakage

Also Published As

Publication number Publication date
DE4327925A1 (de) 1995-02-23
EP0714339A1 (fr) 1996-06-05

Similar Documents

Publication Publication Date Title
US5439493A (en) Abrasive coating remover and process for using same
DE69006853T2 (de) Verfahren zur rückgewinnung von partikeln danebengesprühter farbe.
EP2377649B1 (fr) Agent de rayonnement et procédé de rayonnement
EP0316264A2 (fr) Procédé et dispositif pour le dévernissage et l'enlèvement de couches de surfaces
EP0192088A1 (fr) Procédé de décapage de surfaces
EP0714339A1 (fr) Utilisation des silicates de metaux alcalins comme agents de grenaillage a sec hydrosolubles
DE102013107400A1 (de) Verfahren zur Entfernung des Oversprays eines thermischen Spritzbrenners
EP0178164A1 (fr) Procédé de nettoyage de surfaces
US8597077B2 (en) Alkaline earth carbonate containing mineral for surface cleaning
DE102005026409B4 (de) Verfahren zur Reinigung oder Bearbeitung eines Metallkörpers
DE10243035B4 (de) Verfahren und Vorrichtung zum Entfernen von durch Erhitzung und Abkühlung auf Metallwerkstücken sich bildenden Schichten
DE10200727C1 (de) Umweltfreundliche Reinigungsmittel für Verkehrsmittelaußenflächen
DE202007018670U1 (de) Fassadenbehandlung
DE3301172C1 (de) Verfahren zur Herstellung eines silikose- und eisenfreien Strahlmittels zur Oberflaechenbehandlung
DE2218422A1 (de) Schrotprallmaterial und Verfahren zu dessen Herstellung
DE3125792C2 (de) Reinigungsmittel für mit einer auskristallisierten Eisenphosphatschicht überzogene Baustahloberflächen und Verfahren zum Reinigen derselben mit einem solchen Reinigungsmittel
DE880679C (de) Verfahren zur Oberflaechenbehandlung schwermetallischer Gegenstaende durch Aufspritzen von Phosphorsaeure, OElloesungsmittel und kolloidale Zuschlaege enthaltenden Gemischen
WO2002072312A1 (fr) Procede de traitement par projection de matiere
DE10111237A1 (de) Strahlverfahren zum Reinigen von Rohren
DE372743C (de) Verfahren zur Verhinderung des Verschlackens von Roststaeben, Rostflaechen usw
DE19843683A1 (de) Abrasivmittel, Verfahren zu seiner Herstellung und seine Verwendung
DE2710306B2 (de) Reinigungsflüssigkeit für Leichtmetalloberflächen
EP0147636A2 (fr) Procédé de préparation de la formation de dépôts difficilement éliminables dans les installations de récupération de la chaleur perdue des fours à verre, notamment des fours à verre soluble
DE202015102039U1 (de) Nassabscheider zum Reinigen eines staubbeladenen Gasstroms
DE19940441B4 (de) Verfahren zum Sandstrahlen mit verwertbarem Strahlgut

Legal Events

Date Code Title Description
AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1994926171

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1994926171

Country of ref document: EP

WWR Wipo information: refused in national office

Ref document number: 1994926171

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1994926171

Country of ref document: EP

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载