Weldable primer compositions and processes employing same
阅读：494发布：2023-06-21
专利汇可以提供Weldable primer compositions and processes employing same专利检索，专利查询，专利分析的服务。并且Weldable primer compositions for steel plate and the like, comprising a resin constituent, aluminum powder, an inorganic oxide coloring constituent capable of exothermically reacting with the aluminum powder at welding arc temperatures, and a solvent-diluent, the compositions being applied by spraying, the primer compositions being fast drying and being capable of welding by low hydrogen welding rod without prior primer coating removal and without weldment degradation. The resin constituent is characterized by a low hydroxyl content and is selected from the group consisting of prepolymerized phenoxy resins and mixtures thereof with a minor amount of a thermoplastic, catalytically polymerized, hydrocarbon resin selected from the group consisting of highly aromatic petroleum resins and terpene phenolic resins. The aluminum powder has a particle size predominantly less than about 325 mesh, and functions as a pigment, corrosion inhibitor, electrical conductor, exothermic reactant, and deoxidizer, present in a ratio of from about 1:100 to about 1:1, and preferably from about 1:40 to about 1:1, by weight of the resin constituent. The inorganic oxide coloring constituent and exothermic reactant is selected from the group consisting of iron oxide and chromium oxide, either of which provides a distinctive color coding to the primer as applied, and is capable of reacting with the aluminum powder in the area of the weld melt to promote essentially complete combustion of the primer coat resin constituent along the weld and to form Al2O3 which in turn performs a beneficial fluxing action. Other constituents are includable in the primer compositions, such as corrosion inhibitors (calcium-amino chromate having been found to be especially effective in this regard) and inert fillers such as mineral powder (i.e. talc), lamp black, thickening agents such as bentonite, and grinding aids.，下面是Weldable primer compositions and processes employing same专利的具体信息内容。
1. IN COMBINATION WITH A STEEL STRUCTURAL MEMBER HAVING A MECHANICALLY PRE-CLEANED SURFACE, A PRIMER COATING WHEREBY THE PRIMED STEEL CAN BE ARC WELDED BY MEANS OF A LOW HYDROGEN WELDING ELECTRODE AT HIGH SPEED WITH GOOD WELD QUALITY AND WITHOUT PRIMER COATING REMOVAL, SUCH PRIMER COATING BEING FURTHER CHARACTERIZED BY EXCELLENT BONDING QUALITIES AND THE PRESENTATION OF GOOD ADHESION SURFACE FOR A WIDE RANGE OF PAINTS AND SYNTHETIC COATING, THE SAID PRIMER COATING AFTER DRYING COMPRISING A MIXTURE OF: A. A RESINOUS MATERIAL CONSITING ESSENTIALLY OF A PREPOLYMERIZED, SELF-CURING PHENOXY RESIN MIXED WITH A MINOR AMOUNT OF THERMOPLASTIC, CATALYTICALLY POLYMERIZED HYDROCARBON RESIN SELECTED FROM THE GROUP CONSISTING OF AROMATIC PETROLEUM RESINS AND TERPENE PHENOLIC RESINS; B. ALUMINUM POWDER HAVING A PARTICULAR SIZE AT LEAST PREDOMINANTLY LESS THAN ABOUT 325 MESH AND PRESENT IN A WEIGHT RATIO OF FROM ABOUT 1:40 TO ABOUT 1:1 RELATIVE TO THE RESINOUS MATERIAL, SAID ALUMINUM POWDER SERVING AS A PIGMENT, CORROSION INHIBITOR, ELECTRICAL CONDUCTOR, EXOTHERMIC REACTANT; C. AN INORGANIC OXIDE POWDER SELECTED FROM THE GROUP CONSISTING OF IRON OXIDE, CHROMIUM OXIDE, AND MIXTURES THEREOF, AND SERVING AS A COLORING CONSTITUENT AND EXOTHERMIC REACTANT; SAID ALUMINUM POWDER BEING PRESENT IN AN AMOUNT RENDERING A DRIED COATING OF THE COMPOSITION SUFFICIENTLY ELECTROCONDUCTIVE TO ENABLE INITIATION OF A ROD WELDING ARC THERETHROUGH, AND SAID INORGANIC OXIDE BEING PRESENT IN THE AMOUNT OF A LEAST 20% BY WEIGHT RELATIVE TO THE ALUMINUM POWDER TO PROVIDE SUBSTANTIAL EXOTHERMIC REACTION THEREWITH AND PROMOTE LOCALIZED PRIMER BURN-OFF WHEN THE PRIMER COATING IS HEATED BY ROD WELDING ARC.
2. The combination of claim 1, wherein the resinous material in the primer coating consists essentially of a mixture of phenoxy resin and petroleum resin.
2. aluminum powder having a particle size at least predominantly less than about 325 mesh and present in weight ratio of from about 1:40 to about 1:1 relative to the resinous material, said aluminum powder serving as a pigment, corrosion inhibitor, electrical conductor, exothermic reactant, and deoxidizer;
3. an inorganic oxide powder selected from the group consisting of iron oxide, chromium oxide, and mixtures thereof, and serving as a coloring constituent and exothermic reactant;
3. The combination of claim 1, wherein the resinous material in the primer coating consists essentially of a mixture of phenoxy resin and terpene phenolic resin.
4. The combination of claim 1, wherein the primer coating further comprises finely divided mineral powder as an inert filler.
4. a fast drying organic solvent-diluent mixture in which said resinous material is completely soluble, the solvent portion of which at least principally comprises an oxygenated organic solvent characterized by a substantially complete absence of unreacted hydroxyl groups; said aluminum powder being present in an amount rendering a dried coating of the composition sufficiently electroconductive to enable initiation of a rod welding arc therethrough, and said inorganic oxide being present in the amount of at least 20% by weight relative to the aluminum powder to provide substantial exothermic reaction therewith and promote localized primer burn-off when the primer coating is heated by rod welding arc; and c. air drying the resulting primer coating.
5. The combination of claim 1, wherein the aluminum powder and resinous material in the primer coating are respectively present in weight ratio of from about 1:40 to 1:1.
6. The combination of claim 1, wherein the primer coating further comprises a calcium-amino chromate as a corrosion inhibitor.
7. The combination of claim 1, wherein the inorganic oxide powder, serving as a coloring constituent and exothermic reactant in the primer coating is present at least in an amount sufficient to stoichiometrically react with essentially all of the aluminum powder present in the primer coating.
8. The process of priming steel to place such in a form suitable for extended outside storage and subsequent welding by low hydrogen electrode without prior primer coating removal, said process comprising: a. particle-blasting the surface of the steel to clean same; b. spraying the surface of the steel with a primer composition to a coating thickness of less than about 2 mils, such priming composition as applied to the steel surface comprising a mixture of:
9. The process of claim 8, wherein said resinous material consists essentially of a mixture of phenoxy resin and petroleum resin.
10. The process of claim 8, wherein said resinous material consists essentially of a mixture of phenoxy resin and terpene phenolic resin.
11. The process of claim 8, further comprising finely divided mineral powder as an inert filler.
12. The process of claim 8, further comprising a calcium-amino chromate as a corrosion inhibitor.
13. The process of claim 8, wherein the inorganic oxide powder, serving as a coloring constituent and exothermic reactant, is present at least in an amount sufficient to stoichiometrically react with essentially all of the aluminum powder present.
14. The process of claim 8, wherein the aluminum powder and resinous material are respectively present in weight ratio of from about 1:40 to 1:1.
15. The process of claim 14, further comprising finely divided mineral powder as an inert filler.
16. The process of claim 8, wherein the solvent-diluent is selected from the group consisting of acetone, methyl ethyl ketone, and mixtures thereof, and the diluent is selected from the group consisting of toluene, xylene, and mixtures thereof.
17. The process of claim 16, wherein the solvent and diluent are present in approximately equal proportions.
18. A primer composition for steel enabling arc welding of the steel at high speed and with good weld quality by means of a low hydrogen welDing electrode applied directly over a primed steel surface, such primer composition being further characterized by a fast drying time, excellent bonding qualities and the presentation of a good adhesion surface for a wide range of paints and synthetic coatings, said primer composition as applied to the steel comprising a mixture of: a. a resinous material consisting essentially of a prepolymerized, self-curing phenoxy resin mixed with a minor amount of thermoplastic, catalytically polymerized hydrocarbon resin selected from the group consisting of aromatic petroleum resins and terpene phenolic resins; b. aluminum powder having a particle size at least predominantly less than about 325 mesh and present in a weight ratio of from about 1:40 to about 1:1 relative to the resinous material, said aluminum powder serving as a pigment, corrosion inhibitor, electrical conductor, exothermic reactant, and deoxidizer; c. an inorganic oxide powder selected from the group consisting of iron oxide, chromium oxide, and mixtures thereof, and serving as a coloring constituent and exothermic reactant; d. a fast drying organic solvent-diluent mixture in which said resinous material is completely soluble, the solvent portion of which at least principally comprises an oxygenated organic solvent characterized by a substantially complete absence of unreacted hydroxyl groups; said aluminum powder being present in an amount rendering a dried coating of the composition sufficiently electroconductive to enable initiation of a rod welding arc therethrough, and said inorganic oxide being present in the amount of at least 20% by weight relative to the aluminum powder to provide substantial exothermic reaction therewith and promote localized primer burn-off when the primer coating is heated by rod welding arc.
19. The composition of claim 18, wherein said resinous material consists essentially of a mixture of phenoxy resin and petroleum resin.
20. The composition of claim 18, wherein said resinous material consists essentially of a mixture of phenoxy resin and terpene phenolic resin.
21. The composition of claim 18, further comprising finely divided mineral powder as an inert filler.
22. The composition of claim 18, further comprising a calcium-amino chromate as a corrosion inhibitor.
23. The composition of claim 18, wherein the inorganic oxide powder, serving as a coloring constituent and exothermic reactant, is present at least in an amount sufficient to stoichiometrically react with essentially all of the aluminum powder present.
24. The composition of claim 18, wherein the aluminum powder and resinous material are respectively present in weight ratio of from about 1:40 to 1:1.
25. The composition of claim 24, further comprising finely divided mineral powder as an inert filler.
26. The composition of claim 18, wherein the solvent-diluent is selected from the group consisting of acetone, methyl ethyl ketone, and mixtures thereof, and the diluent is selected from the group consisting of toluene, xylene, and mixtures thereof.
27. The composition of claim 26, wherein the solvent and diluent are present in approximately equal proportions.
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