Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
  • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
  • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
  • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D195/00—Coating compositions based on bituminous materials, e.g. asphalt, tar, pitch

Definitions

• This invention relates to improved rust preventive compositions and, more particularly, to improved compositions having utility as solvent-cutback, hard film rust reventives. More specifically, the invention relates to asphalt cutback rust preventive compositions which have been improved in low temperature flaking tendency by inclusion therein of a minor proportion of a microcrystalline wax.
• Solvent-cutback, hard film rust preventives are known in the art These are cold-applied compounds used for (1) the protection of metals exposed to a variety of outdoor weather conditions and (2) any general purpose preservation where a dry-to-touch film is desired. These materials generally contain an asphalt diluted with a petroleum solvent. The compounds are fluid in nature and may be applied to the metal surfaces to be protected by dipping, brushing or spraying. Upon evaporation of the solvent, a thin film, usually about 1 to 5 mils thick, remains on the metal parts to serve as protection against weathering, corrosive fumes, and the like. In addition, the protective coating should not flow from surfaces at high temperatures nor flake at low temperatures. When desired, the thin film is easily removed from the metal surfaces by the application of solvents such as petroleum solvents and the like.
• Asphalts made by vacuum or steam reduction or by reduction followed by oxidation are desirable as base materials for use in certain solvent-cutback, hard film rust preventives because these asphalts have good storage stability and drying characteristics, give excellent protection, and are readily removed after exposure. They do, however, tend to be excessively brittle at low temperatures, and when cold give an undesirable degreeof flak- .ing or chipping from the metal surfaces being protected. This is particularly undesirable since the portion of-the metal surface exposed is thus available for rusting and corrosion to an even greater degree than completely unprotected surfaces.
• the base material for the compositions'of this inven 'tion comprises from 40 to 70% by weight of an asphalt and from 60 to 30% of .a solvent therefor.
• the asphalt may be selected from the group of straight reduced asphalts or asphalts prepared by vacuum reduction to a solid'flux with a penetration of less than 200 mm./1O
• Asphalts prepared by oxidation of a liquid flux are not operable.
• the solvent used in preparing the base material may be any of the well-known petroleum solvents having flash points between about and about F. and mid-boiling points ranging from about 300 to about 350 F. with a final boiling point below about 410 F. If it is desired, blends of various solvents having FBP below about 410 F. may be used as the diluent for the asphaltic material.
• hard film, solvent-cutback rust preventive compositions were formulated from the following components.
• Asphalt A This asphalt is a reduced asphalt made by the vacuum reduction of a Columbian crude. This material, a straight reduced asphalt, had a softening point of about 146 F.
• Asphalt B This asphalt was prepared by vacuum reduction of a Venezuelan (Lagunillas) crude to a liquid flux having a flash point of about 500 to 505 F. This flux was then oxidized by air blowing at about 425 F. to a softenin point of to 180 F.
• Asphalt C This asphalt was prepared by vacuum reduction of a Venezuelan (Lagunillas) crude to a 500/505 F. flash point liquid flux followed by oxidation by air blowing at about 425 F. to a softening point of 220 to 235 F.
• Asphalt A fourth asphalt was prepared by vacuum reducing a Venezuelan (Lagunillas) crude to obtain a solid flux having a 20 to 30 penetration at 77 F. This material was then air blown at about 425 F. to a softening point of 160 to F.
• Asphalt E A fifth asphalt was prepared by vacuum reducing a Venezuelan (Lagunillas) crude to a solid flux with a 41 to 60 penetration followed by air blowing at about 425 F. to a softening point of 160 to 170 F.
• Solvent A was a highly refined virgin cut petroleum solvent from a low sulfur parafiinic crude having the following inspections:
• Flash point (tag) F 105 Kauri-butanol number 38.0 Aniline point, F 129 50 Percent off at 375 F 90 Final boiling point, F 405 Solvent B was an aromatic petroleum solvent having more than 95% aromatics and having the following inspections:
• test panel is coated as in the film thickness test and allowed to hang in the laboratory for 4 hours. At the end of this time the panel is handled, using normal finger pressures. Any transfer of the compound or injury to the film fromhandling fails this test.
• the scratch tool consists of four razor blades held parallel and /e apart by a metal holder.
• Steel panels are coated'and film thickness measured as in the first test above.
• the compound is then stored in the laboratory at 77i5 Fffor 30 days. At the end of this time the compound is mixed by rolling a tightly sealed 0.9 full can at approximately R. P. M. for 5 minutes.
• a second set of panels are then coated as before and the film thickness measured. Any increase in film thickness exceeding 15% fails the storage test.
• Asphalt A (146 F. S. P.) Asphalt B F.I180 F. S. P.) Asphalt 0 (220 F./235 F. S. P.) Asphalt D (160 F./ F. S. P.) (from Solvent:
• the asphalt must be either a straight reduced asphalt (A) or one prepared by oxidation of a solid flux prepared by reduction (D or E). Addition of the microcrystalline Wax to asphalts prepared by oxidation of liquid fluxes (B or C) gives unsatisfactory products.
• composition prepared in accordance with the inventive concept has the following components.
• compositions of the invention comprise from 40.0 to
• a solvent cutback hard film rust preventive composition which consists essentially of a blend of from about 53% to about 63% of an asphalt selected from the class consisting of straight reduced asphalts having a softening point of from about F. to about 250 F. and asphalts prepared by reduction to a solid flux having a penetration of less than 200 mm./ 10 at 77 F. followed by oxidation to a softening point of from about 140 F. to about 250 F., about 34% to about 44% of a petroleum solvent having a final boiling point within the range of from 350 to 450 F., and about 3% to about 5% of a microcrystalline wax having a melting point above 175 F. and a penetration at 77 F. less than 10 mm./ 10, said percentages being by weight based on the weight of the total composition.
• a solvent cutback hard film rust preventive composition which consists essentially of a blend of about 53% to about 63% of an asphalt prepared by reduction to a solid fiux having a penetration at 77 F. of less than 70 mum/10 followed by oxidation to a softening point of about to F., about 34% to about 44% by Weight of a petroleum solvent having a final boiling point within the range of about 360 to about 410 F., and about 3.0 to 5.0 wt. percent of a microcrystalline wax having a melting point above F. and a penetration at 77 P. less than 10 mm./10.
• a solvent cutback hard film rust preventive comlposition which consists essentially of a blend of about 55.0 wt. percent of an asphalt prepared by reduction to a solid flux having a penetration at 77 F. of less than 70 mm./ 10 followed by oxidation to a softening point of about 160 to about 170 F., about 41.0 wt. percent of a petroleum solvent having a final boiling point of about 405 F., and about 4.0 wt. percent of a microcrystalline wax having a melting point above 175 F. and a penetration at 77 F. less than 10 mm./10.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Paints Or Removers (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Lubricants (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24248459

Family Applications (1)

Country Status (3)

Citations (2)

• 1956
  • 1956-02-02 US US562948A patent/US2872334A/en not_active Expired - Lifetime
• 1957
  • 1957-01-08 GB GB719/57A patent/GB800590A/en not_active Expired
  • 1957-01-15 FR FR1170874D patent/FR1170874A/fr not_active Expired

Patent Citations (2)

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