Classifications

• • 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
  • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
  • C09D183/02—Polysilicates
• • 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
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/08—Anti-corrosive paints
  • C09D5/10—Anti-corrosive paints containing metal dust
  • C09D5/106—Anti-corrosive paints containing metal dust containing Zn
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/02—Polysilicates

Definitions

• the present invention relates to an inorganic zinc shop primer composition and a coated steel structure obtained by coating it on a steel structure. More specifically, the present invention is excellent in weldability and anticorrosion properties, and is also excellent in fusing properties.
• the present invention relates to an inorganic zinc shop primer composition capable of forming an inorganic zinc shop primer coating film on a steel structure, and a painted steel structure obtained by coating the steel structure with the inorganic zinc shop primer composition.
• Inorganic zinc shop primer when welding and fusing for processing assembly, due to the combustion gas of the organic component contained in the primer, welding defects such as pits and blowholes (bubbles) are generated in the welded part. There has been a problem that it becomes large and the width of the thermally damaged portion of the primer coating film becomes large. Moreover, the steel structure coated with the inorganic zinc shop primer sometimes has a poor corrosion resistance at the part subjected to the heat load on the painted back surface of the welded portion. In the present specification, the anticorrosion property of the coated back surface may be expressed as “welding portion back surface anticorrosion property”.
• Patent Document 1 discloses a method for improving welding defects by setting the film thickness to about 6 to 10 ⁇ m.
• Patent Document 1 discloses a coated steel structure coated with such a thin-film inorganic zinc shop primer.
• a new problem arises that red rust tends to occur.
• the zinc powder in the inorganic zinc shop primer composition is increased, a lot of white rust is generated, and it is necessary to remove this during overcoating, increasing the number of man-hours Became a problem.
• Patent Document 2 discloses tetraalkoxysilicates, alkyltrialkoxysilicates and / or their hydrolysis initial condensates (A), acidic water-dispersed colloidal silica (B), zinc dust (C) and silica powder,
• a primary rust preventive paint for steel containing a powder (D) having a loss on ignition of 2% by weight or less selected from rutile powder, synthetic rutile powder, chromium powder and zircon powder is disclosed.
• this paint the weldability is greatly improved.
• the powder (D) there is a problem that the fusing property is inferior.
• JP-A-6-210240 Japanese Patent Laid-Open No. 3-79675
• An object of the present invention is an inorganic zinc shop primer composition capable of forming a coating film excellent in weldability and corrosion resistance in a thin film, and the fusing property of a coated steel structure on which the coating film is formed is also good.
• An inorganic zinc shop primer composition and a coated steel structure obtained by coating the primer composition on a steel structure.
• an inorganic zinc shop primer composition containing a zinc powder having an average particle diameter in a specific range and an extender pigment exhibits good weldability and corrosion resistance
• a coated steel structure obtained by coating the steel composition with the primer composition is also excellent in fusing property.
• the present invention has been completed based on such knowledge.
• the present invention provides the following inorganic zinc shop primer composition and a coated steel structure obtained by coating the primer composition on a steel structure.
• Item 1 Based on the total mass of the silica-based mass of the inorganic binder component (A), the mass of the zinc dust (B) and the mass of the extender pigment (C), 9-19 mass% of the inorganic binder component (A ), An inorganic zinc shop primer composition comprising 61 to 79% by weight of zinc dust (B) and 8 to 23% by weight of extender pigment (C),
• the inorganic binder component (A) has a general formula of (R 1 ) n —Si— of 64 to 95% by mass in terms of silica based on the total mass in terms of silica of the inorganic binder component (A).
• R 1 is an alkyl or phenyl group having 1 to 18 carbon atoms which may be substituted with an epoxy group or a mercapto group, and R 2 has 1 to 6 carbon atoms
• An organosilicate represented by an alkyl group and n is an integer of 0 to 2 and / or its condensate component (a1), and 5 to 36% by mass of colloidal silica (a2) in terms of silica.
• the zinc dust (B) has an average particle size of 0.5 to 10 ⁇ m
• the extender pigment (C) comprises 50 to 80% by mass of silica powder (c1) having an average particle size of 1 to 10 ⁇ m, 20 to 50% by mass of feldspar and kaolin, based on the total mass of the extender pigment (C).
• An inorganic zinc shop primer composition comprising at least one extender pigment (c2) having an average particle diameter of 10 ⁇ m or less selected from the group consisting of:
• Item 2 A coated steel structure obtained by coating the steel structure with the inorganic zinc shop primer composition according to Item 1 so that the average film thickness of the dried coating film is 5 to 15 ⁇ m.
• the inorganic zinc shop primer composition of the present invention exhibits good weldability and corrosion resistance, and a coated steel structure obtained by coating the primer composition on a steel structure is excellent in fusing property.
• the inorganic zinc shop primer of the present invention is characterized by excellent corrosion resistance even in a thin film having an average dry film thickness of about 5 to 15 ⁇ m.
• the inorganic zinc shop primer composition of the present invention has a silica equivalent mass of 9 based on the total mass of the inorganic binder component (A), the silica equivalent mass, the zinc dust (B) mass, and the extender pigment (C) mass. Comprising 19% by mass of an inorganic binder component (A), 61-79% by mass of zinc powder (B) having an average particle diameter of 0.5-10 ⁇ m, and 8-23% by mass of extender pigment (C). It is characterized by that.
• the inorganic zinc shop primer composition of the present invention will be described in detail.
• the inorganic binder component (A) is 9 to 19% by mass in terms of silica, preferably based on the total mass of component (A) in terms of silica, component (B) and component (C), preferably It can be contained in the range of 10 to 17% by mass, more preferably 11 to 15% by mass.
• the amount of the inorganic binder component (A) is less than 9% by mass, the anticorrosion property of the obtained coating film may be deteriorated. May decrease.
• the inorganic binder component (A) has a general formula of (R 1 ) n —Si— (64 to 95% by mass in terms of silica based on the total mass in terms of silica of the inorganic binder component (A).
• OR 2 4-n (wherein R 1 is an alkyl or phenyl group having 1 to 18 carbon atoms which may be substituted with an epoxy group or a mercapto group, and R 2 is an alkyl having 1 to 6 carbon atoms) And n is an integer of 0 to 2) and / or its condensate component (a1) and 5 to 36% by mass of colloidal silica (a2) in terms of silica. .
• organosilicate and / or its condensate component (a1) examples include organosilicates such as tetraalkoxysilicate, alkyltrialkoxysilicate, and dialkyldialkoxysilicate and / or condensate components thereof.
• organosilicates such as tetraalkoxysilicate, alkyltrialkoxysilicate, and dialkyldialkoxysilicate and / or condensate components thereof.
• tetraalkoxysilicate examples include tetramethoxysilicate, tetraethoxysilicate, tetrapropoxysilicate, tetraisopropoxysilicate, tetrabutoxysilicate, tetraisobutoxysilicate, and the like.
• examples of the alkyltrialkoxysilicate include methyltrimethoxysilicate, methyltriethoxysilicate, methyltripropoxysilicate, ethyltrimethoxysilicate, ethyltriethoxysilicate, and the like.
• examples of the dialkyl dialkoxysilicate include dimethyldimethoxysilicate, dimethyldiethoxysilicate, diethyldimethoxysilicate, diethyldiethoxysilicate, and the like. These can be contained alone or in admixture of two or more. Moreover, these organosilicates may contain what advanced the condensation reaction to arbitrary reaction rates following the hydrolysis reaction.
• Examples of commercially available products of such an organosilicate condensation reaction include ethyl silicate 28 (manufactured by Nippon Colcoat), ethyl silicate 40 (manufactured by Nippon Colcoat), ethyl silicate 48 (manufactured by Nippon Colcoat), and the like. Can do.
• the hydrolysis reaction can be performed by a reaction between an appropriate amount of water and an organosilicate, but may be performed in the presence of water or a colloidal silica (a2) described later dispersed in a solvent containing water.
• an appropriate compound such as an acid or a base can be used as a catalyst.
• the organosilicate and / or its condensate component (a1) is 64 to 95% by mass in terms of silica, more preferably 70 to 90% by mass, based on the total mass in terms of silica of the inorganic binder component (A). % Can be included.
• the content of (a1) is less than 64% by mass, the obtained coating film becomes brittle and the corrosion resistance may be lowered.
• the content is more than 95% by mass, the weldability of the obtained coating film is low. May be inferior.
• the colloidal silica (a2) can be dispersed in an organic solvent, water, or a mixture of water and an organic solvent.
• the colloidal silica (a2) has an average particle diameter of about 1 nm to 100 nm, preferably 5 nm to 50 nm.
• those dispersed in water can be used as they are, but those obtained by chemically modifying the surface of the colloidal silica particles with an organic resin, an organic compound, an inorganic compound, a polysiloxane compound or the like are used. Also good.
• the colloidal silica (a2) may be contained in the range of 5 to 36% by mass, more preferably 10 to 30% by mass in terms of silica based on the total mass of silica in terms of the inorganic binder component (A). it can.
• the content of the colloidal silica (a2) is less than 5% by mass, the weldability of the obtained coating film may be inferior, and when it is more than 36% by mass, the obtained coating film may become brittle. is there.
• Colloidal silica (a2) has a smaller amount of pyrolysis gas due to a high-temperature arc during welding than organosilicate and / or its condensate component (a1). It is estimated that
• the silica equivalent mass of the inorganic binder component (A) or the silica equivalent mass of the organosilicate and / or its condensate component (a1) is all silica atoms contained in the component (A) or component (a1). It is the mass calculated on the assumption that it changes to [expressed as (SiO 2 ) in the composition formula]. In this specification, the value of the mass is 10% by mass of water, 30% by mass of isopropanol, and 0.01% by mass of 2N hydrochloric acid based on the total mass of the component (A) or the component (a1). By holding at 40 ° C.
• Zinc powder (B) In a conventional ordinary inorganic zinc shop primer composition, zinc powder having an average particle diameter larger than 10 ⁇ m is often used. In the present invention, however, the average particle is used from the viewpoint of the anticorrosive property of the resulting coating film. A diameter of 0.5 to 10 ⁇ m, preferably 2 to 8 ⁇ m, more preferably 3 to 6 ⁇ m can be used. The average film thickness of the dried coating film was 5 to 15 ⁇ m by using one having the above particle diameter range and further using extender pigment (C) described later having an average particle diameter in a specific range. However, it is possible to obtain a coating film excellent in long-term corrosion resistance. In the present specification, the particle size of zinc powder is a value measured by a Beckman Coulter LS particle size distribution measuring device.
• the zinc dust (B) is 61 to 79% by mass based on the total mass of the mass of the inorganic binder component (A) in terms of silica, the component (B) and the component (C), and further 64%. It is preferably contained within a range of ⁇ 76% by mass. If the zinc dust (B) is less than 61% by mass, the resulting coating film may be inferior in corrosion resistance, and if it is more than 79% by mass, the weldability of the obtained coating film may be reduced, The amount of rust generated may increase.
• Extender pigment (C) contains silica powder (c1) having an average particle diameter of 1 to 10 ⁇ m and at least one extender pigment (c2) selected from the group consisting of feldspar and kaolin with an average particle diameter of 10 ⁇ m or less.
• the extender pigment (c2) is particularly preferably kaolin from the viewpoint of both performance of the welded portion back surface anticorrosive property and fusing property.
• melting property the evaluation of the roughness of the melted section of the steel structure coated with the shop primer coating film.
• the silica powder (c1) is contained in the range of 50 to 80% by mass, more preferably 55 to 75% by mass, and further preferably 60 to 70% by mass based on the total mass of the extender pigment (C). it can.
• the extender pigment (c2) is contained in the range of 20 to 50% by mass, more preferably 25 to 45% by mass, and further preferably 30 to 40% by mass, based on the total mass of the extender pigment (C). Can do. If the extender pigment (c2) is less than 20% by mass, the fusing property may be inferior, and if it is more than 50% by mass, the corrosion resistance at the back of the welded part may be inferior.
• the average particle diameter of the silica powder (c1) is 1 to 10 ⁇ m, preferably 2 to 8 ⁇ m, more preferably 3 to 6 ⁇ m.
• the extender pigment (c2) may have an average particle size of 10 ⁇ m or less, preferably 0.5 to 5 ⁇ m, more preferably 1 to 3 ⁇ m.
• the average particle diameter of the extender pigment (C) is a value measured by a laser diffraction particle size distribution measuring device (name of equipment used: SALD-200V ER, manufactured by Shimadzu Corporation).
• SALD-200V ER heat-diffraction particle size distribution measuring device
• the extender pigment (C) may contain other extender pigments (c3) in a range of 30% by mass or less based on the total mass of the extender pigment (C).
• examples of other extender pigments (c3) include clay, calcined clay, mica, calcined mica, talc, barium sulfate, calcium carbonate, aluminum hydroxide, zinc oxide, barite, zirconium oxide, iron oxide and the like. . These may be used alone or in combination of two or more, among which fired clay and fired mica are preferred from the viewpoints of weldability and fusing properties.
• the other extender pigment (c3) is used in an amount exceeding 30% by mass, the corrosion resistance of the back surface of the welded portion of the obtained coating film may be inferior.
• the average particle diameter of the other extender pigment (c3) is preferably 10 ⁇ m or less from the viewpoint of long-term corrosion resistance.
• the extender pigment (C) is 8 to 23% by mass, further 10 to 21 based on the total mass of the inorganic binder component (A) in terms of silica, the component (B) and the component (C). It is preferable to contain within the range of mass%. When the amount of extender pigment (C) is less than 8% by mass, the corrosion resistance at the back of the welded portion of the obtained coating film may be inferior. Sometimes.
• rust preventive pigments and colored pigments can be used in combination so long as the object of the present invention is not impaired.
• rust preventive pigments and colored pigments include titanium oxide, graphite, iron phosphide, MIO, lead cyanamide, zinc chromate, zinc phosphate, calcium phosphate, barium metaborate, zinc molybdate, aluminum molybdate, bengara, and cyanine coloring.
• examples thereof include pigments, carbon black, and zircon powder.
• the average particle diameter is less than 4 ⁇ m from the viewpoint of forming a dense coating film.
• the primer composition of the present invention may be blended with appropriate amounts of additives such as resins, solvents, anti-settling agents and the like used in ordinary paints other than the above essential components and pigments.
• additives such as resins, solvents, anti-settling agents and the like used in ordinary paints other than the above essential components and pigments.
• resin well-known resin, such as polyvinyl alcohol resin, an acrylic resin, an epoxy resin, a butyral resin, a polyester resin, an alkyd resin, a polysiloxane resin, can be used individually or in mixture.
• the inorganic zinc shop primer composition of the present invention can be prepared according to a conventional method.
• the powder-containing component containing a solvent, an additive and the like can be stored in a separate container, and both can be mixed immediately before use.
• the inorganic zinc shop primer composition of the present invention is preferably coated on the surface of a steel structure so that the average thickness of the dry film thickness is 5 to 15 ⁇ m. When the average film thickness is thinner than 5 ⁇ m, the anticorrosive property for a long time may be insufficient.
• the inorganic zinc shop primer of the present invention is excellent in corrosion resistance and fusing property as compared with the conventional inorganic zinc shop primer composition even when the average film thickness is greater than 15 ⁇ m.
• the primer composition can be applied by conventionally known means such as air spray, airless spray, and brush.
• the applied primer composition can be dried and cured at room temperature or under heating.
• drying and curing the hydrolysis reaction of the organosilicate and / or its condensate component in the primer composition is accelerated by moisture in the atmosphere, and further proceeds by the subsequent condensation reaction.
• the drying and curing time at room temperature is usually 7 days or more after the primer composition is applied.
• the heating temperature in drying and curing under heating is desirably 40 to 120 ° C., and the drying and curing time can be appropriately adjusted.
• the surface of the steel structure Prior to the coating of the inorganic zinc shop primer composition of the present invention, the surface of the steel structure is subjected to a treatment such as shot blasting or sand blasting to remove black skin or red rust, and then coated with the primer composition.
• a treatment such as shot blasting or sand blasting to remove black skin or red rust
• this blasting and painting are performed continuously.
• the object to be coated with the inorganic zinc shop primer coating is mainly a large steel structure such as a ship or a bridge or a steel material for the steel structure, the coating is used for welding, fusing, etc. in the construction process.
• the main purpose is to protect the steel structure or the steel material for steel structure from rusting during the construction period without any hindrance.
• anticorrosion paints such as epoxy, tar epoxy, chlorinated rubber, oily, epoxy ester, acrylic, vinyl and inorganic zinc can be overcoated.
• the primer coating film is excellent in adhesion with such a top coating film.
• Table 2-1-1, Table 2-1-2, Table 2-2-1 and Table 2-2-2 organosilicate derived from the inorganic binder component (A) and / or its condensation component
• the silica equivalent mass of (a1) and colloidal silica (a2) is shown, and the total mass of the silica equivalent mass, the zinc dust (B) mass, and the extender pigment (C) mass is 100. .
• each inorganic zinc shop primer coated so that the average dry film thickness of each inorganic zinc shop primer in the following test might be 10 micrometers except 6 micrometers in Example 18, 14 micrometers in Example 19, and 30 micrometers in a reference example.
• the average dry film thickness is 10 ⁇ m, but tests and evaluations with different average dry film thicknesses were also performed in the same manner. The test results and evaluation are shown in Table 2-1-1, Table 2-1-2, Table 2-2-1 and Table 2-2-2.

Landscapes

• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Paints Or Removers (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Laminated Bodies (AREA)
• Other Surface Treatments For Metallic Materials (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=51262482

Family Applications (1)

Country Status (4)

Cited By (5)

Families Citing this family (3)

Citations (9)

Family Cites Families (8)

• 2014
  • 2014-02-03 WO PCT/JP2014/052451 patent/WO2014119784A1/ja active Application Filing
  • 2014-02-03 JP JP2014559802A patent/JP6289382B2/ja active Active
  • 2014-02-03 CN CN201480007364.0A patent/CN104968740B/zh active Active
  • 2014-02-03 KR KR1020157021097A patent/KR101792081B1/ko active IP Right Grant

Patent Citations (9)

Also Published As

Similar Documents

Legal Events