# US 11,111,946 B2 · Rust proofing treatment liquid for threaded part, method for producing rust-proofed threaded part, and rust-proofed threaded part

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- Number: US 11,111,946 B2
- Document ID: US11111946B2
- Status: Granted
- Kind: B2
- Application number: 16/225,520
- Filed: 2018-12-19
- Published: 2019-05-02
- Granted: 2021-09-07
- Earliest claimed: 2016-08-04
- Assignees: Aoyama Seisakusho Co., Ltd.
- Applicants: Aoyama Seisakusho Co., Ltd.
- Inventors: Shingo Nakajima; Takashi Ito
- Web page: https://patentgrep.com/patent/US11111946B2

## CPC

- F16B 33/008: {Corrosion preventing means}
- B05D 7/16: using synthetic lacquers or varnishes
- B05D 7/51: {One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating (pretreatment of metallic substrates C23C; pretreatment before coating in general B05D3/00)}
- C09D 5/08: Anti-corrosive paints
- C09D 163/00: Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D 163/10: Epoxy resins modified by unsaturated compounds
- C09D 167/04: Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C09D167/06 takes precedence)
- F16B 35/00: Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws ({F16B33/008 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275; using screws with adjustment sleeves F16B5/0283}; thread cutting screws F16B25/00)
- B32B 27/08: of synthetic resin
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/38: comprising epoxy resins
- B32B 2250/03: 3 layers
- B32B 2255/06: on metal layer
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/28: Multiple coating on one surface
- B32B 2305/30: Fillers, e.g. particles, powders, beads, flakes, spheres, chips
- B32B 2307/752: Corrosion inhibitor
- B32B 2311/20: Zinc
- B32B 2311/30: Iron, e.g. steel
- B32B 2363/00: Epoxy resins
- B32B 2391/00: Waxes
- C23C 22/62: Treatment of iron or alloys based thereon
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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 (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)

## Abstract

Threaded parts such as bolts are rust-proofed by using a treatment liquid including a binder resin containing silica and at least one of a modified epoxy resin obtained by graft polymerization using a carboxylic acid-containing acrylic polymer as a side chain and a modified acrylic resin obtained by graft polymerization using a carboxylic acid-containing acrylic polymer as a side chain. By using this treatment liquid, coating treatment can be carried out at one time without need to use an organic solvent. There is an advantage that the friction coefficient does not increase even when tightening is repeated.

## Claims

### Claim 1

A rust-proofed threaded part comprising a corrosion-resistant film, which is formed on an iron substrate as a first surface layer of the iron substrate, an insoluble metal silicate that is in an outer surface layer of the corrosion-resistant film, and a rustproof coating film, which has an inner surface and an outer surface, that is formed on the corrosion-resistant film, as an exposed second surface layer of the iron substrate, such that the rustproof coating film has a thickness of 2 to 4 μm and the insoluble metal silicate is contained between the corrosion-resistant film and the rustproof coating film, wherein the insoluble metal silicate is on the outer surface layer of the corrosion-resistant film and the inner surface of the rustproof coating film is on the insoluble metal silicate and the outer surface layer of the corrosion-resistant film, and wherein the rustproof coating film is composed of a polymer with a network structure obtained by polymerizing a rust proofing treatment liquid for a threaded part, the rust proofing treatment liquid containing a silica binder and at least one of a modified epoxy resin obtained by graft polymerization using a carboxylic acid-containing acrylic polymer as a side chain and a modified acrylic resin obtained by graft polymerization using a carboxylic acid-containing acrylic polymer as a side chain.

### Claim 2 (depends on 1)

The rust-proofed threaded part according to claim 1, wherein the insoluble metal silicate is at least one metal silicate selected from the group consisting of calcium orthosilicate, calcium metasilicate, calcium sodium silicate, magnesium orthosilicate, magnesium metasilicate, magnesium calcium silicate, zinc orthosilicate, and zinc metasilicate.