MXPA96001821A - Lubricating composition for use in work pieces in hot metal molding - Google Patents
Lubricating composition for use in work pieces in hot metal moldingInfo
- Publication number
- MXPA96001821A MXPA96001821A MXPA/A/1996/001821A MX9601821A MXPA96001821A MX PA96001821 A MXPA96001821 A MX PA96001821A MX 9601821 A MX9601821 A MX 9601821A MX PA96001821 A MXPA96001821 A MX PA96001821A
- Authority
- MX
- Mexico
- Prior art keywords
- weight
- sodium
- water
- lubricant composition
- composition according
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 47
- 238000000465 moulding Methods 0.000 title claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 8
- 239000002184 metal Substances 0.000 title claims abstract description 8
- 230000001050 lubricating effect Effects 0.000 title claims description 5
- 239000000314 lubricant Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000011734 sodium Substances 0.000 claims abstract description 15
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 14
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 14
- 229940045919 sodium polymetaphosphate Drugs 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 12
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 12
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 12
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 12
- 239000002562 thickening agent Substances 0.000 claims abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 9
- 239000005373 porous glass Substances 0.000 claims abstract description 9
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 7
- 239000011591 potassium Substances 0.000 claims abstract description 7
- 150000002739 metals Chemical class 0.000 claims abstract description 6
- 239000011521 glass Substances 0.000 claims description 24
- 239000006185 dispersion Substances 0.000 claims description 17
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 12
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 12
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 11
- 229910021538 borax Inorganic materials 0.000 claims description 11
- 239000004328 sodium tetraborate Substances 0.000 claims description 11
- 229910021382 natural graphite Inorganic materials 0.000 claims description 7
- 238000005461 lubrication Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 235000019983 sodium metaphosphate Nutrition 0.000 claims description 5
- 150000004676 glycans Chemical class 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 4
- 229920001282 polysaccharide Polymers 0.000 claims description 4
- 239000005017 polysaccharide Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 241001460678 Napo <wasp> Species 0.000 claims description 3
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- -1 alkali metal salt Chemical class 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims 1
- 239000010452 phosphate Substances 0.000 claims 1
- 229940045916 polymetaphosphate Drugs 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract 1
- 229910052796 boron Inorganic materials 0.000 abstract 1
- 229910052914 metal silicate Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 238000009472 formulation Methods 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 239000004115 Sodium Silicate Substances 0.000 description 9
- 229910002804 graphite Inorganic materials 0.000 description 9
- 239000010439 graphite Substances 0.000 description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- 229910052911 sodium silicate Inorganic materials 0.000 description 8
- 239000000126 substance Substances 0.000 description 6
- 230000003115 biocidal effect Effects 0.000 description 5
- 239000003139 biocide Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 5
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 5
- 239000004111 Potassium silicate Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 4
- 229910052912 lithium silicate Inorganic materials 0.000 description 4
- 229910052913 potassium silicate Inorganic materials 0.000 description 4
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 4
- 235000019353 potassium silicate Nutrition 0.000 description 4
- 235000019830 sodium polyphosphate Nutrition 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 229920001285 xanthan gum Polymers 0.000 description 3
- 229920002125 Sokalan® Polymers 0.000 description 2
- 229920013820 alkyl cellulose Polymers 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000000230 xanthan gum Substances 0.000 description 2
- 229940082509 xanthan gum Drugs 0.000 description 2
- 235000010493 xanthan gum Nutrition 0.000 description 2
- GJCOSYZMQJWQCA-UHFFFAOYSA-N 9H-xanthene Chemical compound C1=CC=C2CC3=CC=CC=C3OC2=C1 GJCOSYZMQJWQCA-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001300078 Vitrea Species 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- CDMADVZSLOHIFP-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane;decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 CDMADVZSLOHIFP-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000374 eutectic mixture Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229940005740 hexametaphosphate Drugs 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- AQMNWCRSESPIJM-UHFFFAOYSA-M sodium metaphosphate Chemical compound [Na+].[O-]P(=O)=O AQMNWCRSESPIJM-UHFFFAOYSA-M 0.000 description 1
- 235000019795 sodium metasilicate Nutrition 0.000 description 1
- 235000019351 sodium silicates Nutrition 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Abstract
The present invention relates to lubricant composition for use on workpieces, in the molding or hot forming of metals, the composition is characterized in that it comprises: a1) 0-80% by weight of a vidirio powder, a2) 0-50 % by weight of a porous glass, whereby the content of at least one component a1) or a2) in the lubricant composition is not 0% by weight, b) 10-25% by weight of one or more metal silicates alkaline, of the general formula Me2O.n SiO2, where Me is lithium, potassium or sodium, and n is a number between 1 and 4, d) 1-6% by weight of a water-soluble sodium polymetaphosphate, e) 0 -3% by weight of a sodium polymetaphosphate insoluble in water, f) 0.5-45 by weight of a thickener, g) 0-1% by weight of boron
Description
LUBRICANT COMPOSITION FOR USE IN WORK PARTS, IN THE HOT MOLDING OF METALS DESCRIPTION OF THE INVENTION The present invention relates to a new lubricant composition, for use on workpieces, in the hot forming or molding of metals, in particular, for use in the hot rolling of blocks and profiles, or in the production of hollow blocks, in plants with banks for drawing tubes. Due to the fact that the metals to be worked have a surface temperature from about 800 ° C to 1300 ° C, the practice so far has been to concentrate on the lubrication of workpieces that at temperatures of at most 400 ° C are more accessible to classic lubrication. Although it is described in the prior art, for example in Swiss Patent 660 023, that workpieces at temperatures above 600 ° C can also be treated with the lubricant dispersion mentioned therein, the practical comparison does not The formation of an effective lubricant film adheres to temperatures in the range from 800 ° C to 1300 ° C. The lack of adhesion is caused essentially by the immediate pyrolysis of the organic constituents, which makes the adhesion of the movie. The pyrolysis of the organic constituents, and the smoke formation associated with this is additionally a very unpleasant accompanying effect for the working environment. In a practical test, the formation of a lubricant film was not found, in the case of the lubricant / pickling agent compositions of Swiss Patent 670 106, applied in powder form. Precisely, the uniform application of a powder mixture represents a considerable difficulty in this case. However, the lubrication of the tools is also affected with several difficulties, depending on the type of tool. Thus, the application of the lubricant is often hindered simply by the geometry of the tool, or the low temperatures of the tool, of around 100 ° C, do not allow the proper formation of a lubricant film. The continuous treatment of the tools with large quantities of cooling water additionally causes large losses of lubricant to be the rule, which results in contamination of the wastewater, and makes the proper treatment of the wastewater necessary. Therefore, relatively large amounts of lubricant are required for good lubrication. Accordingly, there was the object of developing a lubricating co-position which does not have the above mentioned disadvantages, and as a result, is suitable for providing workpieces having surface temperatures from 800 ° C to 1300 ° C with a uniform lubricant film, with good adhesion, and insoluble in water. The object could be achieved by means of the new lubricant compositions according to claim 1, comprising: a1) 0-80% by weight of a glass powder a2) 0-50% by weight of a glass frit porous with which the content of at least one component a,) or a ") in the lubricant composition is not 0% by weight b) 10-25% by weight of natural or synthetic graphite c) 5-20% by weight of one or more alkali metal silicates of the general formula Me "0.n Si0 ~, where Me is lithium, potassium or sodium, and n is a number between 1 and 4, d) 1-6% by weight of a sodium polymetaphosphate soluble in water e) 0-3% by weight of a water-insoluble sodium polymetaphosphate f) 0.5-4% by weight of a thickener g) 0-1% by weight of borax. For use with workpieces having surface temperatures in excess of 800 ° C, preference is given to using a lubricating composition comprising: a. ) 0-20% by weight of a glass powder a2) 30-50% by weight of a porous glass frit b) 20-25% by weight of natural or synthetic graphite c) 7-20% by weight of one or more alkali metal silicates of the general formula Me «0.n Si02, where Me is lithium, po-tasium or sodium, and n is a number between 1 and 4, d) 2-6% by weight of a water-soluble sodium polymetaphosphate e) 0-1% by weight of a polymethylphosphate of sodium insoluble in water f) 3-4% by weight of a thickener g) 0.2-0.7% by weight of borax. For use with workpieces having surface temperatures in excess of 1000 ° C, preference is given to the use of a lubricant composition comprising: a,) 45-70% by weight of a glass powder a) 0-20% by weight of a porous glass frit b) 20-25% by weight of natural or synthetic graphite c) 7-20% by weight of one or more alkali metal silicates of the general formula Me20.n Si02, wherein Me is lithium, po-tasium or sodium, and n is a number between 1 and 4, d) 1-2% by weight of a water-soluble sodium polymetaphosphate e) 0-1% by weight of a water-insoluble sodium polymetaphosphate f) 1.5 -2% by weight of a thickener g) 0-0.25% by weight of borax. The glass powder used is advantageously a normal glass, having an average particle diameter d, -n of ^ 100 Jltm, and a smoothing range from about 700 ° C to 900 ° C (CAS No. 65997-17- 3 ). The glass powder is primarily responsible for the excellent film properties of the lubricant. Due to its relatively high softening point, it is used in an increasing amount when the surface temperature of the workpiece exceeds the 1000 ° C mark. In contrast, porous glass is used particularly when the temperatures used are in the range lower, above about 800 ° C. Then, due to the lower smoothing range (compared to glass powder) from about 500 ° C to 700 ° C, the film-forming properties of the porous glass reach be totally effective In terms of its chemical composition, the glass fritade is advantageously an alkali metal / alkaline earth metal alumino-noborosilicate, and is generally used in an average particle size d &n of <; 100 Jm. The glass powder and the glass frit can be used in any mixing ratio, depending on the use, within the indicated limits. An additional essential constituent is graphite. It can be used either a synthetic graphite or a natural graphite. The average particle size d- "of the graphite employed is appropriately less than 100 km. Advantageously, a graphite having a high crystallinity, that is, having a crystallite length Lc greater than 100 nm, is used. The water-soluble alkali metal silicates assume an essential function as binders. Use is made of water-soluble alkali metal silicates, individually or in a mixture, of the general formula Me20.n Si02 > where Me is lithium, potassium or sodium, and n is a number between 1 and 4. Preference is given to the use of a sodium metasilicate of the general formula described, where n = 1-1.5, or a sodium silicate where n = 3.3-3.5. (aqueous or soluble glass), or a eutectic mixture of the sodium silicates referred to with a potassium silicate of the general formula K20.n Si02, wherein n is 2.4-3 and / or a lithium silicate of the general formula Li20 .n Si0", where n is 2.4-3. Particular preference is given to the use of a mixture of the preferred alkali metal silicates, in a ratio of sodium silicate: potassium silicate: lithium silicate of 12.3%: 67.5%: 20.7%. The function of a constituent of the lubricant that suppresses the formation of foam is satisfied by a metapoliphosphate of sodium soluble in water. For the purposes of the present invention, this means a compound of the general formula (NaPO,), wherein n is less than 450. These compounds are also known as "hexametaphosphate" or "Graham's salt".
Additionally, it is possible to add a sodium polymetaphosphate insoluble in water, as agglutinate. Particularly suitable for this purpose are the compounds of the general formula (NaPO.,), Wherein n is from 40 to 70, known under the name "Maddrell salt". The addition of a thickener, advantageously a polysaccharide or a polysaccharide derivative, is decisive to ensure a constant viscosity, and the stability of the lubricant dispersion over a wide temperature range, and to reduce the sedimentation of the dispersion. the solids in the dispersion. Advantageously, biopolysaccharides are used, such as xanthan gum, ramsana gum, or an alkyl cellulose such as hydroxy methyl cellulose. A similar result is given by the addition of alkali metal salts of the polyacrylic acid, in particular sodium polyacrylates, as thickeners. To prevent bacterial attack, a commercial biocide is advantageously added to the lubricant composition. Finally, it is possible to add borax (sodium tetraborate decahydrate) as a coupling agent. The lubricant of the invention is advantageously used in the form of an aqueous dispersion, which has a solids content of preferably from 20 to 50%. It is very possible to vary the limits upwards or downwards. The dispersion can be produced in commercial dispersion apparatuses, which make high cutting forces possible (compare for example EP-B 218 989). The ready-to-use dispersion advantageously has a viscosity in the range from 1000 MPas to 7000 MPas (Rheomat 15, 20 ° C, cell B, speed 5), but may also be further varied by the addition of thickeners. The application of the lubricant dispersion can be carried out by means of known systems for spraying dispersed systems (compare for example EP-A 453 801). According to the invention, the lubricant composition described above is used on workpieces having surface temperatures from 800 ° C to 1300 ° C, in the molding or hot forming of metals, in particular, in the hot rolling of blocks and profiles, or in the production of hollow blocks in plants with banks for stretching tubes. The application of the dispersion on the workpiece is carried out immediately before the molding or shaping. The preliminary pickling or descaling of the work piece is advantageous, but not absolutely necessary. After the immediate vaporization of the water, a uniform lubricating film, insoluble in water, is formed on the surface of the work piece in a few seconds, and this film is not damaged by the subsequent molding or shaping process. Eg: The viscosity data reported below were measured in a Rheomat 15, at 20 ° C, in a cell B, and speed 5). Formulation 1 (suitable for work pieces that have surface temperatures of 850 ° C-1200 ° C).
49. 17% by weight of a glass frit (frit binder K2244, which has a d7f) < 100 un, Schauer Co. , Vienna, Austria) 25% by weight of graphite (synthetic graphite T 75, having a d5Q = 24 um, LONZA G &T, Sins, Switzerland) 15.67% by weight of aqueous glass (sodium silicate water soluble Na20. n Si02, where n = 3.3-3.5) 6.00% by weight of water-soluble sodium polyphosphate (Al-Copon, Benckiser-Knapsack, Ladenburg, Germany) 3.33% by weight of hydroxymethylcellulose (Dow Chemical) 0.67% by weight of Borax 0.16% by weight of biocide
Dispersion: 20% in water Viscosity: 1000-2000 MPas Formulation 2 (suitable for work pieces that have surface temperatures of 1000 ° C-1250 ° C) 64.85% by weight of glass powder (300 glass powder, which has a d70 <, 63 lim, from Mineralienwerke Kuppenheim) 24.94% by weight of graphite (synthetic graphite T 75, having a d5Q = 24 ^ um, LONZA G &T, Sins, Switzerland) 6.98% by weight of soluble sodium silicate in water (Na-On
Si02, where n = 1-1.15) 1.67% by weight of water soluble sodium polyphosphate (Al-copon, Benckiser-Knapsack, Ladenburg, Germany) 1.33% by weight of hydroxymethylcellulose (Dow Chemical) 0.22% by weight of gum of xanthan 0.01% by weight of biocide
Dispersion: 40% in water Viscosity: 1000-3000 MPas Formulation 3 (suitable for work pieces that have surface temperatures of 1000 ° C-1250 ° C) 47.78% by weight of glass powder (glass powder 300, which has a d7"< 63 üm, from Mineralenwerke Kuppenheim) 16.53% by weight of glass frit (frit binder K2244, having a d7f) < 100 iim, Schauer Co. , Vienna, Austria) 24.84% by weight of graphite (synthetic graphite T 75, which has a d5Q = 24 Jim, LONZA G &T, Sins, Switzerland) 6.74% by weight of alkali metal silicate mixture soluble in water (sodium silicate: potassium silicate: lithium silicate = 12.3: 67.5: 20.7, Me20.n Si02, where n = 2.7) 1.32% by weight of water-soluble sodium polyphosphate (Al-copon, Benckiser-Knapsack, Ladenburg, Germany) 0.92% by weight of water insoluble sodium polyphosphate (Dentphos M, Benckiser-Knapsack, Ladenburg, Germany) 0.25% by weight of borax 0.45% by weight of xanthan gum 1.10% by weight of hydroxymethylcellulose (Dow Chemical ) 0.07% by weight of biocide Dispersion: 40% in water Viscosity: 2000-5000 MPas Formulation 4 (suitable for work pieces that have surface temperatures of 850 ° C-1250 ° C) 49.53% by weight of glass frit (frit) binder K2244, which has a d7f) < 100 un, Schauer Co. , Vienna, Austria) 24.76% by weight of graphite (synthetic graphite T 75, which has a d5Q = 24 jLim, LONZA G &T, Sins, Switzerland) 6.74% by weight of alkali metal silicates mixture soluble in water (sodium silicate: potassium silicate: lithium silicate = 12.3: 67.5: 20.7, Me20.n Si02, where n = 2.7) 2.64% by weight of water-soluble sodium polyphosphate (Al-copon, Benckiser-Knapsack, Ladenburg, Germany) 1.32% by weight of water insoluble sodium polyphosphate (Dentphos M, Benckiser-Knapsack, Ladenburg, Germany) 0.66% by weight of borax 3.30% by weight of hydroxymethylcellulose (Dow Chemical) 0.71% by weight of polyacrylate of sodium (Carbopol, Goodrich Chemical) 0.14% by weight of biocide
Dispersion: 20% in water Viscosity: 2000-5000 MPas Comparative formulation 1: (described in the Swiss Patent
660 023, Example 1) 54% by weight of crystalline graphite 11% by weight of Maddrell's salt 5% by weight of borax 10% by weight of sodium silicate (aqueous glass, Si02 / Na20
3. 3) 18% by weight of 2% polyethylene by weight of alkylcellulose
Aqueous dispersion, which has a solids content of 30% by weight Viscosity: 1900 MPas Comparative formulation 2: (described in the Swiss patent
670 106, Example 2) 70% by weight of sodium tripolyphosphate (Na, -P 010) 4% by weight of graphite 26% by weight of Na2B20, .8H20 Powder Mix: Comparative Test: Test conditions: The formulations 1 a, and comparative formulation 1 are sprayed on the surface, which is at 800 ° C to 1050 ° C, from a vertical steel block, moved at 1.5 m / s, and having the dimensions of 29 cm x 6 it was x 3 cm, by means of a nozzle (pressure 50.95 kg / cm, 50 bar), located at a distance of 43 cm. The comparative formulation 2 is dry pulverized, as described in Swiss Patent 670 106. The formed lubricant film is evaluated according to the following classifications. Class 1 There is no formation of a lubricant film. Class 2 Formation of a film of crumbly lubricant, which adheres for only a short time (a few seconds). Class 3 Immediate formation of a film of uniform lubricant, vitrea, well adhered, which has a high mechanical resistance and a high resistance to water. Results of the test: Formulation Test results (class) 1 3 (above 850 ° C) 2 3 (above 1000 ° C) 3 3 (above 1000 ° C) 4 3 (above 850 ° C) Comparison 1 1 Comparison 2 2 It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.
Having described the invention as above, property is claimed as contained in the following:
Claims (12)
- CLAIMS 1. Lubricant composition for use on workpieces, in the molding or hot forming of metals, the composition is characterized in that it comprises: a,) 0-80% by weight of a glass powder a2) 0-50% by weight of a porous glass whereby the content of at least one component a1) or a2) in the lubricant composition is not 0% by weight b) 10-25% by weight of natural or synthetic graphite c) 5-20% by weight of one or more alkali metal silicates, of the general formula Me20.n Si02, where Me is lithium, potassium or sodium, and n is a number between 1 and 4, d) 1-6% by weight of a polymetaphosphate sodium soluble in water e) 0-3% by weight of a water-insoluble sodium polymetaphosphate f) 0.5-4% by weight of a thickener g) 0-1% by weight of borax.
- 2. A lubricant composition according to claim 1, characterized in that the used glass powder has an average particle diameter d-, 0 of < 100 Aim, and a smoothing range of about 700 ° C-900 ° C.
- 3. A lubricating composition according to claim 1 or 2, characterized in that the porous glass used has an average particle diameter d -. < 100 Jim, and a smoothing range of about 500 ° C-700 ° C.
- 4. The lubricant composition according to any of claims 1-3, characterized in that the water-soluble alkali metal silicates of the general formula Me20 .n Si02, where Me is lithium, potassium or sodium, and n is a number between 1 and 4, are used individually or in a mixture.
- 5. The lubricant composition according to any of claims 1-4, characterized in that the water-soluble sodium polymeth- phosphate used is a Grahara salt, of the general formula (NaPO.,), Wherein n is less than 450.
- The lubricant composition according to any of claims 1-5, characterized in that the water-insoluble sodium polymetaphosphate used is a Maddrell salt of the general formula (NaP03) n, wherein n is from 40 to 70
- 7. The lubricant composition according to any of claims 1-6, characterized in that the thickener used is a polysaccharide, a polysaccharide derivative, or an alkali metal salt of a polyacrylate.
- 8. The lubricant composition according to any of claims 1-7, characterized in that it is in the form of an aqueous dispersion.
- 9. The lubricant composition according to any of claims 1-8, characterized in that it is in the form of an aqueous dispersion having a solids content from 20% to 50%.
- 10. The lubricant composition according to any of claims 1-9, for use with workpieces having surface temperatures greater than 800 ° C, the composition is characterized in that it comprises: a1) 0-20% by weight of a glass powder a2) 30-50% by weight of a porous glass b) 20-25% by weight of natural or synthetic graphite c) 7-20% by weight of one or more alkali metal silicates, of the general formula Me "0.n Si0", where Me is lithium, potassium or sodium, and n is a number between 1 and 4, d) 2-6% by weight of a water soluble sodium polymetaphosphate e) 0-1% by weight of a sodium polymetaphosphate insoluble in water f) 3-4% by weight of a thickener g) 0.2-0.7% by weight of borax.
- 11. The lubricant composition according to any of claims 1-9, for use with workpieces having a surface temperature greater than 1000 ° C, the composition is characterized in that it comprises: a,) 45-70% by weight of a glass powder a) 0-20% by weight of a porous glass b) 20-25% by weight of natural or synthetic graphite c) 7-20% by weight of one or more alkali metal silicates of the general formula I "0.n Si0", where Me is lithium, potassium or sodium, and n is a number between 1 and 4, d) 1-2% by weight of a water soluble sodium polymetaphosphate e) 0-1% by weight of a water-insoluble sodium polymetaphosphate f) 1.5-2% by weight of a thickener g) 0-0.25% by weight of borax.
- 12. The use of a lubricant composition according to any of claims 1 to 11, characterized in that it is for the direct lubrication of workpieces having a surface temperature from about 800 ° C to 1300 ° C, in the molding or hot metal forming.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH141695 | 1995-05-16 | ||
| CH1416/95 | 1995-05-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MX9601821A MX9601821A (en) | 1997-07-31 |
| MXPA96001821A true MXPA96001821A (en) | 1997-12-01 |
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