EP0218989B1 - Verfahren zum Suspendieren von Festschmierstoffen - Google Patents

Verfahren zum Suspendieren von Festschmierstoffen Download PDF

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Publication number
EP0218989B1
EP0218989B1 EP86113474A EP86113474A EP0218989B1 EP 0218989 B1 EP0218989 B1 EP 0218989B1 EP 86113474 A EP86113474 A EP 86113474A EP 86113474 A EP86113474 A EP 86113474A EP 0218989 B1 EP0218989 B1 EP 0218989B1
Authority
EP
European Patent Office
Prior art keywords
water
colloid mill
suspension
process according
mixer
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.)
Expired - Lifetime
Application number
EP86113474A
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German (de)
English (en)
French (fr)
Other versions
EP0218989A2 (de
EP0218989A3 (en
Inventor
Hans-Rudolf Staub
Hansjörg Furrer
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.)
Lonza AG
Original Assignee
Lonza AG
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 Lonza AG filed Critical Lonza AG
Priority to AT86113474T priority Critical patent/ATE60249T1/de
Publication of EP0218989A2 publication Critical patent/EP0218989A2/de
Publication of EP0218989A3 publication Critical patent/EP0218989A3/de
Application granted granted Critical
Publication of EP0218989B1 publication Critical patent/EP0218989B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/82—Combinations of dissimilar mixers
    • B01F33/821—Combinations of dissimilar mixers with consecutive receptacles

Definitions

  • the invention relates to a method for suspending solid lubricants which are used in the non-cutting hot forming of metals, containing graphite and polymers in water as the carrier liquid.
  • Solid lubricants for non-cutting metal forming at high temperatures are known from CH-A-596 294 and 609 728, containing graphite, polymers, suspension aids and optionally other auxiliaries, such as bactericides, which form a suspension with water.
  • auxiliaries such as bactericides, which form a suspension with water.
  • the addition of the bactericides is necessary to avoid bacterial decomposition of the solid lubricant suspension during storage;
  • the suspension auxiliaries serve the purpose of keeping the liquid and solid constituents in a homogeneous mixture even over long periods.
  • the solid lubricant suspension is used up during processing, i.e. the water evaporates on the tool of the workpieces, the polymer component burns off.
  • the bactericidal additives When processing the solid lubricants, the bactericidal additives are also subject to evaporation, which is undesirable in view of their possible toxicity and together with the suspension aids they form a not inconsiderable non-lubricating part of the solid lubricant formulation.
  • the object of the present invention was to propose a process which makes it possible to produce a homogeneous and stable solid lubricant suspension containing a carrier liquid, generally water, graphite and polymers, directly at the point of use, without adding bactericides and with the lowest possible content suspension aids.
  • a carrier liquid generally water, graphite and polymers
  • the dry, premixed components of the solid lubricant and the water can be combined in the colloid mill.
  • the mixture of graphite, the polymer and any additives, such as suspension aids, film stabilizers, and optionally also wetting agents and inorganic additives, is referred to as dry, premixed constituents.
  • additives such as e.g. Wetting agents, solvents, film formers, pH stabilizers, soluble inorganic salts (e.g. phosphates) etc. should be added beforehand.
  • the water optionally with the additives mentioned, such as suspension aids, wetting agents or solvents, etc.
  • the polymer e.g. as a plastic dispersion, premixed and this mixture in the colloid mill with the graphite, which if necessary with e.g. Suspension aids, film stabilizers, etc. are homogeneously mixed, are supplied.
  • the gap between the rotor and housing can be 0.01 to 3 mm; the peripheral speed, calculated from the rotor circumference and speed, can range from 10 to 40 m / sec. be.
  • Suspensions with a solids content of 1 to 70% by weight can be prepared by the process according to the invention.
  • the possibility of achieving such high solids contents in the suspension was all the more surprising since the individual components of the solid lubricant have very low bulk densities. These are 0.2 to 0.5 kg / l for graphite, 0.2 to 0.7 kg / l for the polymers and additives and, for example, 0.2 to 0.5 kg / l for a typical dry mixture .
  • the volume of the solid lubricant is greater than the volume of the water required to produce the suspension.
  • the residence time of the components in the mixing area of the colloid mill is expediently in the range from 0.01 to 5 seconds.
  • Suitable intensive mixers are expediently mixers with at least one co-rotating impeller shaft or counter-rotating impeller shafts, agitator ball mills, guide jet mixers or screw mixers, preferably in a cascade arrangement. If the constituents, ie the solid lubricant and the water, were mixed to form the solid lubricant suspension, for example, only in an intensive mixer, lump formation and inhomogeneity in the suspension could neither be avoided nor eliminated.
  • the arrangement according to the invention the sequential connection of a colloid mill and an intensive mixer make it possible to obtain a completely lump-free, homogeneous solid suspension from the carrier liquid and the solids received, the parts of which are completely wetted and, where appropriate, open-minded.
  • a suspension produced in this way is lump-free and has a significantly longer service life, measured in terms of the type and amount of suspension aid, and sedimentation of the solids only occurs after considerably longer periods of time than when mixing and suspending with only one of the mixers arranged in succession according to the invention it is possible.
  • Solid lubricants to be produced by the process according to the invention are known, for example, from CH-PS 596 294 and 609 728. Accordingly, the starting materials used are at least one solid lubricant, preferably graphite, in particular those graphites with high purity, for example over 90%, and an average grain size of no more than 300 microns. The best results can be achieved with the graphite of 96 to 99.5% purity and an average grain size of 100 micrometers. If appropriate, the use of molybdenum disulfide, CaF 2 or BN alone or in a mixture with graphite is conceivable in the context of the present invention.
  • Polymers are understood as meaning the organic products which decompose without leaving any heat, for example alkylene homopolymers or copolymers. These include the homo- and copolymers of alkenes (monoolefins, diolefins etc.), vinyl esters, vinyl alcohols, unsaturated dibasic acids and esters (dicarboxylic acids and esters), alkyl esters and acyclic acids and esters.
  • the alkylene homopolymer or copolymer can be polyethylene, polymethyl methacrylate, polystyrene, polybutadiene, polyvinyl acetate, polyvinyl propionate, a copolymer of methyl methacrylate and styrene, a copolymer of methyl methacrylate and alphamethylstyrene, polydiallyl phthalate, polypropylene, a copolymer of styrene and butadiene, and polymethyl methacrylate Dibutyl maleate, a copolymer of vinyl acetate and ethylene and polyisobutylene.
  • the polymers mentioned can be used alone or in a mixture with one another dry or, if appropriate, as a dispersion.
  • substances from the group polysaccharides such as starch, celluloses, inulin, glycogen agar, levan, dichinone, pectin, lignin and araban can be used as suspension auxiliaries, furthermore alkyl celluloses, such as e.g. Methyl, ethyl, propyl and butyl celluloses, or alginates such as sodium alginate, potassium alginate, propylene glycol alginate and ammonium alginate, or mixtures of the substances can be used.
  • alkyl celluloses such as e.g. Methyl, ethyl, propyl and butyl celluloses
  • alginates such as sodium alginate, potassium alginate, propylene glycol alginate and ammonium alginate, or mixtures of the substances can be used.
  • the solid lubricant When used, the solid lubricant should be present as a 1 to 70% by weight homogeneous aqueous dispersion and have a viscosity of 100 to 30,000 cp (0.1 to 30 Ns / m 2 at 5 to 50 ° C).
  • an organic stabilizer which may be present in the solid lubricant may also be sufficient.
  • a thickener e.g. water-soluble polysaccharides, alkyl celluloses, polyvinyl alcohols, polyarylates, polyvinyl pyrrolidone, optionally also inorganic substances, in particular minerals, such as clays or silica.
  • the boron compound can be used in soluble and preferably in poorly soluble or insoluble form.
  • borax boric acid
  • B 2 0 3 KB 5 0 8 .4H 2 0
  • zinc borate can be used as the boron compound.
  • the alkali silicate used is preferably a sodium water glass or potassium water glass with an SiO 2 content between 21 and 47%.
  • wetting agent For a safe wetting of the powdery solid lubricant mixture, it can be helpful to add a wetting agent to the mixture and / or the water.
  • wetting agents are alkylarylsulfonates, fatty acid amines, fatty soaps, substituted amides of the alkyl phosphates, sulfonated esters of dicarboxylic acids, sulfonated fatty amides, alkylamines, sodium alkyl sulfates, aliphatic amine esters, polyethers such as polyoxyethylene and polyoxypropylene, sulfonated high phenols or naphthalenesulfonates.
  • the solid lubricant suspensions to be produced by the process according to the invention can contain, for example, 1 to 90% by weight solid lubricant, preferably graphite, 1 to 50% by weight polymer, 1 to 80% by weight inorganic additive and 0.2 to 80% by weight of an organic stabilizer as a solid component contain.
  • Water is used as the carrier liquid, with any additives to the water, such as wetting agents, solvents, e.g. Alcohols, esters, ketones or aldehydes are included.
  • additives in the water may be necessary, for example, to quickly bring the solid lubricant and thereby the extremely poorly wettable graphite into suspension or, for example, to quickly dissolve or swell the polymer portion.
  • the solid lubricants are suitable for high-temperature applications, at temperatures from 300 to 1300 ° C, for example for the lubrication of tools, such as mandrels, mandrel bars or dies and workpieces, such as blanks or pipes, for hot forming in so-called “multiple pipe mills", contours , Pilger step rolling mills, Asselstrasse, push bench systems, bar presses or Squeezing presses, and in rolling mills for profile and sheet metal rolling.
  • the preferred materials for processing are iron and steel.
  • the suspension produced by the method of the invention is by brushing, brushing and preferably by spraying onto the hot workpiece or tool.
  • the carrier liquid in this case the water, and any volatile additives evaporate and leave a waterproof, graphite-containing melt film from the polymer.
  • the water resistance of the film is required in order to be able to cool the surface coated with the solid lubricant if necessary.
  • the film-forming properties are an essential feature of the solid lubricant. However, these do not show up at the place of application, i.e. on the workpiece or tool, but already during mixing, i.e. when the solids and then especially the polymers come into contact with the water. It is therefore all the more surprising that it is now possible to use the process of the invention to produce an extremely poorly wettable substance, such as graphite, and a polymer with strong film-forming to adhesive properties, the film which then has to be waterproof, lump-free and homogeneous with water to mix. What makes the process even more difficult is that the volume of the solids can exceed the volume of the water due to their low bulk density. Finally, the suspension, measured by the amount of suspension aids added, must be extremely stable and must not show segregation or sedimentation over long periods.
  • the invention further comprises the device for carrying out the method according to the invention, consisting of a colloid mill and an intensive mixer immediately downstream.
  • the colloid mill can have a gap width of 0.01 to 3 mm and can run at peripheral speeds of 10 to 40 m / sec. operate.
  • the entire system is suitably designed for throughputs of 25 to 1200 kg / h and preferably up to 2000 kg / h of material.
  • the colloid mill 1 consists essentially of housing 2 and rotor 3, which is set in motion by drive 4. From a storage vessel 5, the graphite / polymer mixture or the graphite alone, each with the further possible additives, and through the feed 6, the water, possibly in a mixture with the polymer and other additives, is fed into the colloid mill 1.
  • the premixed suspension is passed in an intensive mixer 9, shown here by way of example with a cascade-shaped blade stirrer 10.
  • an intensive mixer 9 shown here by way of example with a cascade-shaped blade stirrer 10.
  • a storage vessel 11 can be provided, which can be equipped with a level meter and switches the system on and off according to the level.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Lubricants (AREA)
  • Forging (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Chemically Coating (AREA)
EP86113474A 1985-10-02 1986-10-01 Verfahren zum Suspendieren von Festschmierstoffen Expired - Lifetime EP0218989B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113474T ATE60249T1 (de) 1985-10-02 1986-10-01 Verfahren zum suspendieren von festschmierstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4249/85A CH665847A5 (de) 1985-10-02 1985-10-02 Verfahren zum suspendieren von festschmierstoffen.
CH4249/85 1985-10-02

Publications (3)

Publication Number Publication Date
EP0218989A2 EP0218989A2 (de) 1987-04-22
EP0218989A3 EP0218989A3 (en) 1989-04-26
EP0218989B1 true EP0218989B1 (de) 1991-01-23

Family

ID=4272580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113474A Expired - Lifetime EP0218989B1 (de) 1985-10-02 1986-10-01 Verfahren zum Suspendieren von Festschmierstoffen

Country Status (14)

Country Link
US (1) US4735734A (cs)
EP (1) EP0218989B1 (cs)
JP (1) JPS6291229A (cs)
CN (1) CN1006400B (cs)
AT (1) ATE60249T1 (cs)
CA (1) CA1272181A (cs)
CH (1) CH665847A5 (cs)
CS (1) CS261247B2 (cs)
DD (1) DD249858A5 (cs)
DE (1) DE3677127D1 (cs)
ES (1) ES2020173B3 (cs)
PL (1) PL261617A1 (cs)
SU (1) SU1498378A3 (cs)
ZA (1) ZA867265B (cs)

Families Citing this family (27)

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CH674164A5 (cs) * 1987-09-29 1990-05-15 Lonza Ag
CH674096A5 (cs) * 1988-01-19 1990-04-30 Lonza Ag
CA1329802C (en) * 1988-08-30 1994-05-24 Nippon Kokan Kabushiki Kaisha Lubricant for the production of seamless steel pipes
ATE77645T1 (de) * 1988-10-10 1992-07-15 Rhone Poulenc Chimie Dispersion von halogeniden der seltenen erden in waessrigem medium.
FR2638168A1 (fr) * 1988-10-21 1990-04-27 Rhone Poulenc Chimie Dispersions d'halogenures de terres rares en milieu huileux
US5308516A (en) * 1989-06-08 1994-05-03 Century Oils, Inc. Friction modifiers
US5173204A (en) * 1989-06-08 1992-12-22 Century Oils (Canada), Inc. Solid lubricant with high and positive friction characteristic
US5099667A (en) * 1989-06-16 1992-03-31 Lonza Ltd. System for suspending and applying solid lubricants to tools or work pieces
ATE124291T1 (de) * 1989-06-16 1995-07-15 Lonza Ag Verwendung einer vorrichtung zum suspendieren von graphithaltigen festschmierstoffen.
EP0448944B1 (de) * 1990-03-26 1994-09-14 Lonza Ag Verfahren und Einrichtung zum intervallweisen Versprühen einer Schmiermittel-Suspension
US5114589A (en) * 1991-01-17 1992-05-19 The United States Government As Represented By The Secretary Of The Department Of Health And Human Services Type-XLL cross-axis synchronous flow-through coil planet centrifuge for separation of biopolymers
US5503771A (en) * 1991-05-14 1996-04-02 Washington Technology Center Process for susupension of ceramic or metal particles using biologically produced polymers
US5366644A (en) * 1991-06-20 1994-11-22 Gold Eagle Co. Lubricant for fuel
US5290336A (en) * 1992-05-04 1994-03-01 Hoeganaes Corporation Iron-based powder compositions containing novel binder/lubricants
US5294355A (en) * 1992-12-28 1994-03-15 Desilube Technology, Inc. Thermally and oxidatively stable solid lubricants
US5389270A (en) * 1993-05-17 1995-02-14 Electrochemicals, Inc. Composition and process for preparing a non-conductive substrate for electroplating
US6710259B2 (en) 1993-05-17 2004-03-23 Electrochemicals, Inc. Printed wiring boards and methods for making them
US5476580A (en) * 1993-05-17 1995-12-19 Electrochemicals Inc. Processes for preparing a non-conductive substrate for electroplating
US6303181B1 (en) 1993-05-17 2001-10-16 Electrochemicals Inc. Direct metallization process employing a cationic conditioner and a binder
US6171468B1 (en) 1993-05-17 2001-01-09 Electrochemicals Inc. Direct metallization process
US5725807A (en) * 1993-05-17 1998-03-10 Electrochemicals Inc. Carbon containing composition for electroplating
US5690805A (en) * 1993-05-17 1997-11-25 Electrochemicals Inc. Direct metallization process
US5498276A (en) * 1994-09-14 1996-03-12 Hoeganaes Corporation Iron-based powder compositions containing green strengh enhancing lubricants
US6039784A (en) * 1997-03-12 2000-03-21 Hoeganaes Corporation Iron-based powder compositions containing green strength enhancing lubricants
US7204112B1 (en) * 2002-12-30 2007-04-17 Dana Corporation Method of lubricating a workpiece for hydroforming
DE102005043542A1 (de) * 2005-09-13 2007-03-15 Graphit Kropfmühl AG Stabile wässrige Graphitdispersion mit hohem Feststoffgehalt
CN106362606A (zh) * 2016-10-18 2017-02-01 上海锅炉厂有限公司 一种生产磁悬液的装置及方法

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Also Published As

Publication number Publication date
DE3677127D1 (de) 1991-02-28
CN86106627A (zh) 1987-04-01
ES2020173B3 (es) 1991-08-01
US4735734A (en) 1988-04-05
JPS6291229A (ja) 1987-04-25
EP0218989A2 (de) 1987-04-22
DD249858A5 (de) 1987-09-23
SU1498378A3 (ru) 1989-07-30
CA1272181A (en) 1990-07-31
CN1006400B (zh) 1990-01-10
CH665847A5 (de) 1988-06-15
ATE60249T1 (de) 1991-02-15
ZA867265B (en) 1987-05-27
CS261247B2 (en) 1989-01-12
PL261617A1 (en) 1987-12-28
EP0218989A3 (en) 1989-04-26
CS706186A2 (en) 1988-04-15

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