JP3106388B2 - Stone finishing method and structure of steel base or steel base with old coating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stone material finishing method and structure for a steel (plate) base or a steel (plate) base having an old coating film. More specifically, when a stone-finished structure is newly constructed on a steel substrate, an epoxy resin-based primer is applied to the surface of the steel substrate in advance, so that the stone-finished finish coating material is firmly adhered to (adhered to) the steel substrate. The present invention relates to a finishing method for obtaining a structured structure, and a stone finishing structure. In addition, when repairing a steel base structure that has an old coating that is not a stone-finished structure (for example, paint finish) at the time of new construction, an epoxy resin-based primer is applied to the surface of the old coating in advance to repair the old coating. The present invention relates to a finishing method for obtaining a structure in which a stone finish coating material is firmly adhered (adhered) to a steel base having a film, and a stone finish structure.

[0002]

2. Description of the Related Art There have been quite a lot of actual results of stone-based finish coating materials for concrete foundations from several years ago, but there is no such thing as new construction or repair of steel foundations.

[0003]

The reason is that, in construction and civil engineering, concrete bases are often much more numerous than steel bases, but in general, paint is relatively difficult to adhere to steel bases. by. In particular, at the time of repair work instead of a new construction, it is difficult to completely remove the paint previously applied to the surface of the steel material, so that the paint to be newly applied is less likely to adhere. In addition, the stone-like finish coating material is relatively thick, so it is easy to peel off. On the other hand, steel base materials to be finished with stone finish include bridges (bridge girders, steel piers, pedestrian bridges, etc.), ships (passenger ships), gates, and steel structures such as amusement parks, parks, golf courses, etc. For bridges, the peeling of finishing materials can be fatal. Therefore, with regard to the material and construction method of the stone finish for the steel substrate, it is necessary to take care that the stone finish material does not fall off even in the event of a repair work, in particular. From the above viewpoints, the inventors conducted a thorough study on the undercoating material and the like directly applied to the surface of the steel base material when the steel base material (new construction) or the steel material having the old coating (repair) is to be stone-finished and finished, After repair and new construction, (a) epoxy resin-based primer layer, (b) epoxy resin-based primer and cross layer, (c) epoxy resin-based primer and sand layer The present invention has been completed by knowing that the above can be sufficiently achieved.

[0004]

The present invention is constituted by the following claims. <Claim 1> An epoxy resin-based primer having the following properties on the surface of a cleaned steel substrate when the surface of a steel substrate or a steel substrate having an old coating film is repaired to a stone-finished structure or subjected to finish construction. A stone finish finishing method for a steel base or a steel base having an old coating film, wherein the stone finish is applied after coating. The elongation of the epoxy resin formed by applying the epoxy resin primer is 5 to 500%. The tensile strength of the epoxy resin formed by applying the epoxy resin primer is 5 kg / cm2 or more. The method for finishing stones of a steel substrate having an old coating film or a steel substrate having an old coating film according to claim 1, wherein the primer is coated with irregularities on the surface of the coating film. <Claim 3> When the surface of a steel substrate or a steel substrate having an old coating film is repaired or finished to a stone-finished structure, the epoxy having the property described in claim 1 is applied to the surface of the cleaned steel substrate. A stone-finish method of applying a resin primer, forming a cloth layer on the surface thereof, and then applying stone finish. <Claim 4> When the surface of a steel substrate or a steel substrate having an old coating film is repaired or finished to a stone-finished structure, the epoxy having the property described in claim 1 is applied to the surface of the cleaned steel substrate. A stone-finish method for finishing a steel substrate or a steel substrate having an old coating film, comprising applying a resin-based primer, further forming a sand layer on the surface thereof, and then performing stone preparation. <Claim 5> A stone-finished structure with a steel substrate or a steel substrate having an old coating film, wherein the cross-sectional structure comprises the following first to third layers. First layer: steel substrate or steel substrate with old coating layer Second layer: elongation 5-500%, tensile strength 5 kg / cm
Epoxy resin of 2 or more Third layer: Stone-like multi-layer finish coating material <Claim 6> Steel material having a cross-sectional structure of the following first to fourth layers, or a steel material having an old coating film The stone-finished structure of the base. First layer: steel substrate or steel substrate with old coating layer Second layer: elongation 5-500%, tensile strength 5 kg / cm
Epoxy resin of 2 or more Third layer: Cloth Fourth layer: Stone-like multi-layer finish coating material <Claim 7> A steel base or an old steel whose cross-sectional structure comprises the following first to fourth layers: Stone-finished structure with steel coating on steel base. First layer: steel substrate or steel substrate with old coating layer Second layer: elongation 5-500%, tensile strength 5 kg / cm
Epoxy resin of 2 or more 3rd layer: sand 4th layer: stone-tone multi-layer finish coating material

[0005]

The reason why the stone finishing method and the structure of the steel base of the present invention or the steel base having the old coating film are constituted as described above is that the steel finishing in the base of the steel base, especially in the repair work, This is because, since the old coating film is present on the surface of the base, it is necessary to devise a method of firmly adhering the stone-like multi-layer finish coating material onto the old coating film. Therefore, in the present invention, the following method (technical means) is particularly adopted. (1) Use of epoxy resin primer Apply epoxy resin primer to the surface of the steel substrate or the surface of the old coating film (below the stone-like multi-layer finish coating material) (undercoat) and the steel substrate and the stone material The multi-layered finish coating material is firmly bonded to prevent the stone-like multi-layered finish coating material from falling off. As the epoxy resin-based primer, a primer that forms a coating film having appropriate strength and elongation is preferable. That is, when the elongation of the primer is small, the tensile strength is large, and the primer easily peels between the old coating film and the primer. On the other hand, when the elongation of the primer is large, the tensile strength is small and the primer is cohesively fractured. The tensile strength at the time of this cohesive failure is 10 kg / cm ²
It is preferred that it is about. In consideration of the above points, select a primer, dry-curing shrinkage of the stone-like multi-layer finish coating material,
By absorbing the movement due to expansion and contraction, vibration and the like due to temperature change, it is possible to reduce the force applied to the surface of the old coating film and prevent the stone-like finish coating material from falling off.

(2) Finishing of Uneven Coating Film When Applying Epoxy Resin-Based Primer When applying an epoxy resin-based primer, it is usually applied twice (finished into two layers), and the first-layer primer (hereinafter simply referred to as “primer”) is used. An undercoat primer) is usually used in combination with a rust inhibitor. In addition, the second layer of primer (hereinafter, also simply referred to as an overcoat primer) is finished with an uneven coating film by using a staple roller or the like. The reason for the uneven finish is that the stone-like multi-layer finish coating material is physically caught on the uneven coating film to facilitate adhesion.

(3) Cloth (mesh) sticking finish When applying an epoxy resin-based primer (the above-mentioned primer), a cloth (mesh) is stuck using this as an adhesive to give a cloth (mesh) sticking finish. This is because even if peeling occurs between the old coating film and the first layer (the undercoating primer), the cloth (mesh) stops and the peeling can be prevented.

(4) Sand-wall-like finish When applying an epoxy resin-based primer (the above-mentioned primer), sand is immediately sprayed to give a sand-wall-like finish.
Since the stone-like multi-layer finish coating material adheres well to sand, it is particularly effective in the case of an old coating film (urethane resin type, fluorine resin type) which does not easily adhere.

In the present invention, an epoxy resin layer formed by applying an epoxy resin primer has an elongation of 5 to 500% and a tensile strength of 5 kg / cm ² or more.

The primer applied on the old coating film is preferably an elastic resin. In addition to an elastic epoxy resin, an elastic fluorine resin, a urethane resin, etc., a synthetic rubber (urethane rubber, silicone rubber, polysulfide rubber, Fluoro rubber, acrylic rubber, chlorosulfonated polyethylene, chlorinated polyethylene, epichlorohydrin rubber, propylene oxide rubber, ethylene / vinyl acetate rubber, ethylene / acrylate rubber, liquid rubber, syndiotactic-1,2-polybutadiene, norbornene Rubber, thermoplastic rubber, etc.) can also be used in some cases.

In the present invention, the cloth layer refers to a layer formed by attaching a plain weave such as polypropylene, carbon, glass, or vinylon fiber, or a nonwoven fabric (including a three-dimensional network structure). When forming the cross layer,
Apply a top coat primer (epoxy resin primer).

In the present invention, the sand layer is formed by spraying (stacking) sand having a particle size of 0.5 to 2.5 mm. In forming the sand layer, a top coat primer (epoxy resin primer) is usually applied.

[0013]

【Example】

<Example 1> A stone finished test specimen was prepared on a mild steel plate of 200 x 300 x 1 mm by the following procedure (1), and JIS
A 5910 A repeated heating / cooling test was carried out according to the method of the following (2) in accordance with the multilayer finish coating material. The surface of the test piece had no peeling, cracking or blistering, no significant discoloration and loss of gloss, and an adhesion of 25.7.
kg / m ² (undercoat-break of main material), which was a good result. (1) Preparation of test specimen (a) Polishing, washing and drying (JIS K 5400 paint general test method) Polish the entire surface with abrasive paper # 240 until the metallic luster appears.
Wash thoroughly with an equal volume mixture of ethyl alcohol and benzene, and dry without dust. (B) An undercoat primer (two-part epoxy solvent-based primer, tensile strength 250 kg / cm ² , elongation 5%) is applied by a roller at 0.15 kg / m ² . (C) Top coat primer (two-part epoxy solvent-based primer, tensile strength 250 kg / cm ² , elongation 5%)
Apply 1.0 kg / m ² with a roller. (D) An inorganic polymer-based undercoating material is treated with
Apply kg / m ² . (E) Apply 5.5 kg / m ^{2 of the} main material (special papermaking method thick finishing material) with a double-headed gun. (F) Acrylic silicone resin varnish with a roller
Top coat 0.35 kg / m ² . (2) Hot / cold repetition test (JIS A 6910 multilayer finish coating material) 20 ° C, 18 hours, −20 ° C in water, 3 hours, cooling-5
After repeating the cycle at 0 ° C. for 3 hours and heating as one cycle, the test was carried out by leaving still in a test room for 2 hours.

Example 2 An existing bridge that had been completed for seven years since its completion was repaired with stone materials by the following process, and after one year, no abnormality was found. (1) New coating specifications (a) Long backing type etching primer (b) Lead-based rust preventive paint (1) (c) Lead-based rust preventive paint (1) (d) Long-oil phthalic resin paint middle coat (e) Length Oil-based phthalic acid resin paint overcoating (2) Step (a) Keren, cleaning Using an electric wire brush, the parts with a significant degree of coating deterioration are removed by removing rust and old coatings to reveal the steel surface, and the active film part Removes dust and dirt and cleans. (B) Undercoat primer (two-part epoxy solvent-based primer, tensile strength 150 kg / cm ² , elongation 200%)
Is applied with a roller at 0.15 kg / m ² . (C) Top coat primer (two-part epoxy solvent-based primer, tensile strength 150 kg / cm ² , elongation 200%)
Is applied with a roller at 1.0 kg / m ² . (D) A 0.10 kg / m ² glass cloth (plain weave) is attached. (E) An inorganic polymer-based undercoating material was treated with
Apply kg / m ² . (F) Apply 5.5 kg / m ^{2 of the} main material (special papermaking method thick finishing material) with a double-headed gun. (G) Acrylic silicone resin varnish with a roller
Top coat 0.3 kg / m ² .

<Embodiment 3> Step (b) of (2) of Embodiment 2
Primer primer, tensile strength 110kg / cm ² ,
Tests were conducted using a primer having a tensile strength of 110 kg / cm ² and an elongation of 300% as the top coat primer having an elongation of 300% and (c). The same results as in Example 2 were obtained.

Example 4 An existing bridge 10 years after its completion was repaired with a stone material by the following process, and after one year, no abnormality was found. (1) New coating specifications (a) Inorganic zinc-rich primer (b) Inorganic zinc-rich paint (c) Epoxy resin paint undercoat (d) Polyurethane resin paint intermediate coat (e) Polyurethane resin paint overcoat (2) Process (a) Keren, cleaning Using an electric wire brush, the parts with a significant degree of coating deterioration are removed to remove the rust and old coatings to reveal the steel surface, and the active film parts are cleaned by removing powder and dirt. (B) Undercoat primer (two-part epoxy solvent-based primer, tensile strength 200 kg / cm ² , elongation 100%)
Is applied with a brush at 0.15 kg / m ² . (C) Top coat primer (two-part epoxy solvent-based primer, tensile strength 200 kg / cm ² , elongation 100%)
Is applied with a spatula at 1.0 kg / m ² . (D) A 0.10 kg / m ² glass cloth (plain weave) is attached. (E) An inorganic polymer-based undercoating material was treated with
Apply kg / m ² . (F) Apply 5.5 kg / m ^{2 of the} main material (special papermaking method thick finishing material) with a double-headed gun. (G) Acrylic silicone resin varnish with a brush, 0.3k
g / m ² overcoat.

Example 5 Step (b) of Example 4 (2)
The undercoat primer having a tensile strength of 60 kg / cm ² and elongation of 400%, and the top coat primer (c) having a tensile strength of 60 kg / cm ² and elongation of 400% were tested. The same result as was obtained.

Example 6 An existing bridge that had been completed for seven years after completion was repaired with stone materials by the following process, and after one year, no abnormality was found. (1) New coating specifications (a) Long backing-based etching primer (b) Lead-based rust preventive paint (1) (c) Lead-based rust preventive paint (1) (d) Long-oil-based phthalic acid resin paint middle coat (e) Length Oil-based phthalic acid resin paint overcoating (2) Step (a) Keren, cleaning Using an electric wire brush, the parts with a significant degree of coating deterioration are removed by removing rust and old coatings to reveal the steel surface, and the active film part Removes dust and dirt and cleans. (B) An undercoat primer (two-part epoxy solvent-based primer, tensile strength 250 kg / cm ² , elongation 5%) is applied by a roller at 0.15 kg / m ² . (C) Top coat primer (two-pack epoxy solvent base coat, two-pack epoxy base coat material (tensile strength 250k
g / cm ² , elongation 5%) with a spatula to 0.4 kg / m ²
Paint. (D) Spray 1.2 kg / m ^{2 of} sand (silica sand No. 6). (E) An inorganic polymer-based undercoating material was treated with
Apply kg / m ² . (F) Apply 5.5 kg / m ^{2 of the} main material (special papermaking method thick finishing material) with a double-headed gun. (G) Acrylic silicone resin varnish is rolled with a roller.
3 kg / m ² overcoat.

<Embodiment 7> Step (b) of Example 6 (2)
The undercoat primer having a tensile strength of 10 kg / cm ² and elongation of 500%, and the top coat primer (c) having a tensile strength of 10 kg / cm ² and an elongation of 500% were tested. The same result as was obtained.

Example 8 A 10-year-old bridge that had been completed was repaired with stones by the following process, and after one year, no abnormality was found. (1) New coating specifications (a) Inorganic zinc-rich primer (b) Inorganic zinc-rich paint (c) Epoxy resin paint undercoat (e) Polyurethane resin paint undercoat (e) Polyurethane resin paint overcoat (2) Process (a) ) Keren, cleaning Using an electric wire brush, the part with a remarkable degree of deterioration of the coating film removes rust and old coating film to reveal the steel surface, and the active film part cleans by removing powder and dirt. (B) Undercoat primer (two-part epoxy solvent-based primer, tensile strength 200 kg / cm ² , elongation 100%)
Is applied with a brush at 0.15 kg / m ² . (C) Top coat primer (two-part epoxy solvent-based primer, tensile strength 200 kg / cm ² , elongation 100%)
Is applied with a roller at 1.3 kg / m ² . (D) An inorganic polymer-based undercoating material is treated with
Apply kg / m ² . (E) Apply 5.5 kg / m ^{2 of the} main material (special papermaking method thick finishing material) with a double-headed gun. (F) Acrylic silicone resin varnish with a brush, 0.3k
g / m ² overcoat.

<Embodiment 9> Step (b) of (2) of Embodiment 8
The undercoat primer having a tensile strength of 60 kg / cm ² and elongation of 400%, and the top coat primer (c) having a tensile strength of 60 kg / cm ² and an elongation of 400% were tested. The same result as was obtained.

<Example (Test Example) 10> Elongation of an epoxy resin formed by applying an epoxy resin primer,
In the same manner as in Example 1, except for changing the tensile strength and the tensile strength, a stone finished test specimen was produced, and the adhesion strength of the stone finished coating material was tested.

The test methods for the physical properties (tensile strength and elongation) of the primer base and the adhesion strength of the stone-like multilayer finishing coating material were as follows. (1) Physical properties of the primer base (a) Measurement conditions (a) Dumbbell JIS K63012 (b) Thickness 3 mm (c) Tensile speed 50 mm / min (2) Adhesion strength of stone-tone multi-layer finish coating material JIS A 6910 Multi-layer finish coating material. (A) Method of preparing test specimen (a) New construction (finishing of a stone directly on a steel plate) was performed in the same manner as in Example 1. (B) For repainting (finishing stone material on the old paint film), the same steel sheet as in Example 1 was applied according to the old paint coating specifications and was irradiated for 1000 hours in a weather meter. (The deteriorated surface was removed by using an electric wire brush, the parts with a significant degree of coating deterioration were rusted and the old coating was removed to reveal the steel surface, and the active film was cleaned by removing powder and dirt. ) Stone finishing was performed in the same manner as in Example 1. The coating specifications of the old paint film are as follows. Long Back Etching Primer Lead-based Rust Prevention Paint Class 1 Lead-based Rust Prevention Paint Class 1 Long oily phthalic acid resin middle coat Long oily phthalic acid resin top coat

Table 1 shows the test results. Note: The letters in the table indicate the peeling points shown in Fig. 1 (new) and Fig. 2 (repainting).

The old coating film shown in FIG. 2 includes a long oily phthalic acid resin top coat, a long oily phthalic acid resin middle coat, one kind of lead rust preventive paint, one kind of lead rust preventive paint, and a long back etching primer. Is applied. According to the above results, in the case of a primer having an appropriate tensile strength and elongation, not only in the case of new installation, but also in the case of repainting, the old coating film and the new coating film (stone-like multi-layer finish coating material) It can be seen that they are firmly attached.

[0026]

The invention of the present application has been configured as described above.
When repairing a steel substrate that is not a stone-finished structure or a steel substrate structure that has an old coating at the time of new construction, an epoxy resin-based primer is applied to the surface of the old coating in advance to apply the stone-finish coating material. This has the effect that a structure that is strongly bonded can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view for explaining a broken portion of a stone finishing structure (newly provided).

FIG. 2 is a cross-sectional view for explaining a broken portion of a stone finishing structure (repainting).

[Explanation of symbols]

A, B, to O indicate the boundaries of the cross sections of the respective layers of the stone-finished structure (newly constructed). A ′, B ′, to O ′ indicate boundaries of the cross section of each layer of the stone-finished structure (repainting), respectively.

────────────────────────────────────────────────── (5) Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI E04F 13/08 E04F 13/08 A (56) References JP-A-52-32036 (JP, A) JP-A-60-209282 ( JP, A) JP-A-5-68937 (JP, A) JP-A-7-68701 (JP, A) JP-A-4-290577 (JP, A) JP-A-7-60737 (JP, A) Hei 6-79920 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05D 5/06 101 B05D 7/00 B05D 7/14 B05D 7/24 302 B04C 2 / 08,2 / 26 E04F 13 / 08,13 / 12

Claims (7)

(57) [Claims] 1. An epoxy resin-based primer having the following properties on the surface of a cleaned steel substrate when the surface of a steel substrate or a steel substrate having an old coating film is repaired or finished on a stone-finished structure. A stone finish finishing method for a steel base or a steel base having an old coating film, wherein the stone finish is applied after coating. The elongation of the epoxy resin formed by applying the epoxy resin primer is 5 to 500%. The tensile strength of the epoxy resin formed by applying the epoxy resin primer is 5 kg / cm 2 or more. 2. The stone finishing method of claim 1, wherein unevenness is formed on the surface of the coating film when applying the epoxy resin primer. 3. When the surface of a steel substrate or a steel substrate having an old coating film is repaired or finished on a stone-finished structure, an epoxy having the properties described in claim 1 is applied to the surface of the cleaned steel substrate. A stone-finish method of applying a resin primer, forming a cloth layer on the surface thereof, and then applying stone finish. 4. When the surface of a steel substrate or a steel substrate having an old coating film is repaired or finished to a stone-finished structure, an epoxy having the properties described in claim 1 is applied to the surface of the cleaned steel substrate. A stone-finish method for finishing a steel substrate or a steel substrate having an old coating film, comprising applying a resin-based primer, further forming a sand layer on the surface thereof, and then performing stone preparation. 5. A stone-finished structure with a steel substrate or a steel substrate having an old coating, characterized in that the cross-sectional structure comprises the following first to third layers. First layer: steel substrate or steel substrate with old coating layer Second layer: elongation 5-500%, tensile strength 5 kg / cm
2 or more epoxy resin 3rd layer: Stone-like multi-layer finish coating material 6. A stone-finished structure with a steel substrate or a steel substrate having an old coating film, characterized in that the cross-sectional structure comprises the following first to fourth layers. First layer: steel substrate or steel substrate with old coating layer Second layer: elongation 5-500%, tensile strength 5 kg / cm
2 or more epoxy resin Third layer: Cloth Fourth layer: Stone-like multi-layer finish coating material 7. A stone-finished structure with a steel substrate or a steel substrate having an old coating film, wherein the cross-sectional structure comprises the following first to fourth layers. First layer: steel substrate or steel substrate with old coating layer Second layer: elongation 5-500%, tensile strength 5 kg / cm
2 or more epoxy resin 3rd layer: sand 4th layer: stone-like multi-layer finish coating material