JPS5817177A - Coating composition for power transmission pylon - Google Patents

Abstract

PURPOSE:To provide a corrosion-preventive, non-slip, coloring coating compsn. strongly adherent to the galvanized surface of a steel tower, consisting of (a) epoxy or polyurethane resin, (b) metallic zinc powder, (c) calcium plumbate, and (d) flat pigment or aggregate. CONSTITUTION:The coating compsn. is prepared by mixing (A) 100pts.wt. epoxy resin or polyurethane resin compsn., (B) 5-250pts.wt. metallic zinc powder, (C) 5-200pts.wt. calcium plumbate, and (D) 10-500pts.wt. flat pigment (e.g. flat iron oxide, flat aluminum powder, or glass flake) or aggregate (e.g. sand, silica sand or glass beads). Components A, B and C form a coating film exhibiting strong and long lasting adhesion to the zinc plated surface and component D imparts a non-slip property to the film surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating composition for power transmission towers. In particular, a coating composition for corrosion prevention, coloring, and anti-slip coating on the surface of the galvanized steel tower Micro Quay F#E1, which is coated with galvanized steel, especially bath-dipped galvanized *ii, is used. Pertains to. Conventionally, galvanizing has been widely used as a long-term corrosion protection method for steel materials or steel products. Especially the transmission tower! It is well known that log structures such as IkuP wave towers and the like are coated with hot-dip galvanizing.

Corrosion prevention methods such as Jin are commonly used - Family characteristics a
[It is far superior to the K method.

However, as air and water pollution has progressed recently, the consumption of zinc has become significant.
The reality is that it is no longer possible to expect long-term corrosion protection as before. Therefore, in order to make the long-term corrosion protection inherent in galvanizing effective, an organic coating film is applied to the galvanized surface. It has become essential to prevent contact with corrosive factors such as water and the atmosphere.

In recent years, as structures have become larger, there has been a strong demand for colored beautification, either as an aviation beacon or from the perspective of environmental harmony.For the various reasons listed above, Currently, galvanized surfaces are coated with oil-based or synthetic resin-based paints. However, these types of paints that have been used in the past do not always provide a satisfactory result, and for example, In addition, as structures become larger, it becomes difficult to repaint for maintenance, making it difficult to maintain long-term durability. In terms of durability, color retention, etc., it is recommended to use synthetic resin paints such as tar 4 xy** paints, tar urethane resin paints, unsaturated polyester resin paints, polyoxy resin enamels, and polyurethane resin enamels for dog coats. is being considered, but galvanizing II to improve the adhesion of these dog coats! At present, there is no preferred method for treating the surface.

This prevents maintenance and inspections from being done, but there is a major problem in that climbing up and down the towers is slippery and dangerous. It is an attempt to solve the various problems mentioned above by applying IIK's coating composition.

The present invention relates to (a) a polyurethane resin composition or a polyurethane resin composition;
・・・・・・・・・・・・ 100 parts by weight, (b) Metal zinc powder ・・・・・・・・・ 3 to 150 parts by weight,
(・) Calcium leadate・・・・・・・・・5～
200 parts by weight, and (d) at least a component selected from flat pigments and aggregates.
... 10-100 parts by weight of a coating composition for power transmission towers.
Component (a)) is a mixture of a hydroxy resin containing at least one hydroxy group at the end and a crosslinking agent that chemically reacts with the hydroxy resin. Examples of engineering/life resins include linear bisphenol resin, methyl-substituted hisphenol resin, and side-chain bisphenol resin. Side L Phenol rack f11x-Kikull11, cresol resin, phenol f11 #Mli1. II! Alizoku Kenko Iki 41IIi11
Aromatic Maro I Kishi 1111. There are cycloaliphatic Maroko 1 xy resins, ether ester Takiko 4 xy resins, etc. Commercially available product names include Epicote (trade name manufactured by Shell Chemical Co., Ltd.) and Epiclon (trade name manufactured by Dainippon Ink Chemical Co., Ltd.). product name), Atsurujiite (product name manufactured by Tepa Gaisé)
These can be used alone or in combination to bring out the characteristics of each.

The cross-linking agent for the above-mentioned NEE-XI** is one that has a group that mutually reacts with the hydroxyl group or hydroxyl group contained in the NEE-XI resin molecule, and may be one that is already commonly used as a cross-linking agent for NEE-XI SaW. For example, aliphatic or aromatic such as diethylene triaine, triethylene tetraine, metaxylylene cyaiso, metaphenylene diamine, heterocyclic cyaine, etc.
Reayne: Primary and tertiary amines such as dimethylaz-methylphenol, tris(dimethylaz-methyl)phenol, and piperidine; 4-lyamide dendrite; amine adduct (commonly known as 7-aryan adduct)
Anno-based compounds such as tolylene diisocyanate,
In addition to isocyanate compounds such as hequinamethylene diisocyanate, phenol *m, acid anhydride, main
11ti11 Examples include urea resins, etc. The object of the present invention is generally suitable for use in large-scale steel materials and large-scale steel products. In the present invention, the polyurethane resin composition (component (a) refers to a compound containing at least 2% or more of hydroxyl group-containing f-liester*ti', -lyester-modified acrylic resin, polyester-modified nyxy resin, nyxy-modified acrylic resin, etc., with incyanate compounds such as trilene thiquanate, hexamethylene diisocyanate, etc. A mixture.

Metal zinc powder (01) component used in Hontaka 11IK)
0 refers to a product that is easily available on the market for use in anti-rust paints. )
is usually commercially available as a pigment and is easily available on the market.

Examples of the flat pigment (d) of the present invention include flat iron oxide (ass@ts Ir@n 0xlsl*),
Flat Alzu powder! Squid, glass flakes, fumo, flat lead powder, etc. are used as aggregates).Sand, gravel, limestone, silica, emery, glass peas, etc. are generally used for this technique. All materials that are called materials can be used. It is possible to use a combination of these eccentric S family and the aggregate IsI or more. The coating composition used in the method of the present invention is made of the above-mentioned Nixy resin (component (a)) or 4-urethane resin. Composition ((a
0 parts by weight of metal zinc powder (component (b)), preferably 30 to 10 parts by weight, of the solid content of component ()).
0 parts by weight, calcium leadate (component (a)) 3-100
Parts by weight, preferably /j to 100 parts by weight, and the flat pigment (component (d)) lo to -00 parts by weight, preferably jO
~ljO parts by weight are mixed.

In the coating composition, if either the metal zinc powder or the calcium lead oxide has a content of less than the rIlt part, there is almost no long-term lI pacifying effect of am on the galvanized II surface. Also, if the amount of metal zinc powder is greater than the COSO heavy part, poor adhesion of the coating film will occur at an early stage.

In the above, on the other hand, if the content of calcium leadate increases in the amount of θ0, it will inhibit the initial four-layer properties of the coating film as well as gold II 4 zinc powder, and will increase the cost of the product, so it is not economically viable. I don't like it even if I look at it 〇However, the Society of the Invention I
I! The purpose of adding lead powder and lead acid Calcilla 5 is to stabilize and maintain the long-term adhesion of l1lIiI, and it is located between the galvanized surface layer and the paint film and has a buffering effect that helps improve adhesion. It is believed that the effect of adding flat end sheets and aggregate in 0 1 & zero firing @ is to impart appropriate roughness to the surface INK of the coating layer and to enhance the anti-slip effect.

The preferred content of the flat pigment or aggregate of the present invention is io
~zoo weight part, jl! In the present invention, when the amount of the flat llI family or aggregate exceeds the SOO weight part, it is preferably FiSO~300 weight part.
If the roughness of the surface is too large and there is a tendency for foaming to occur when topcoating is applied, the adhesion of WIi is low, and if the amount is less than the layer of IO, the effect of imparting a rough skin to the surface of the coating film will be poor. The key to the present invention is that the resin composition, metal zinc powder, and calcium lead acid are present in the respective wIE ratios to form a composition that can be used to prevent galvanizing. It is possible to obtain a coating film that has strong adhesion to the surface and maintains its effect for a long time, and due to the effects of the flat pigment and aggregate, the coating film! I! - It imparts an anti-slip effect to the pipe.As described above, in the present invention, each of the above-mentioned components is essential, but other trees J11 that are compatible with the paint composition are used for the purpose of the present invention. It is also possible to add it within a range that does not impair it.

Furthermore, if desired, rust preventive raw materials such as chromium compounds and lead compounds, extender pigments such as Merck and silica, coloring pigments such as iron oxide, carbon black, and titanium oxide, asphalt, tar, pitch, etc. quality, anti-settling agent,
Additives such as anti-sag agents, surfactant steel, and surface conditioners,
A round coupling agent that further enhances the adhesion of the paint film.
Chelate compounds, solvents, etc. may also be added. The method of the present invention is to apply the coating composition having the above composition to galvanizing steel towers by brush, spray, roller, spatula, etc.
/θ~1000i111a by a known method such as a trowel
Adjust and apply so that a dry thickness of about 100% is obtained. The urethane resin and the crosslinking agent are chemically compatible and the coating film can be cured under the conditions necessary for drying the coating film.

However, depending on the purpose of use of the structure, at least 7 coats of various chemical materials such as polyurethane resin paint, Nixi resin paint, chlorinated rubber paint, vinyl chloride resin paint, etc.
It is also possible to form a laminated film by coating the coating layer to a varying thickness without losing its anti-slip properties and drying it, or use an epoxy resin that has good long-term adhesion to the galvanized surface. System/17 Urethane resin system! Undercoat with limer etc. 9
It is also possible to overcoat the paint composition of the present invention on top of the shell paint film to form a top coat film.

The coating film obtained by applying the coating composition of the present invention exhibits strong durability against long-term exposure and submersion in water. It has stable adhesion and an excellent anti-slip effect.

Hereinafter, the concrete effects of the present invention will be shown from the practical point of view.

In Examples and Comparative Examples, "part" means "r*JF1.1 parts by weight" or "weight".

Example 1 Using a linear bisphenol-type epoxy resin from Niekishi M Kyotei go-soo and a monolithic resin having an active hydrogen equivalent of /10 as a crosslinking agent, the Niekishi resin and the crosslinking agent were mixed at a molten weight ratio. A synthetic resin composition was obtained. Next, a coating composition having the composition shown in Table 7 below was prepared. Similarly, coating compositions outside the scope of the present invention may also be prepared for comparison.

A coating layer was obtained by coating the surface of molten zinc so that the dry film thickness was approximately 0.5 mm.
It was dried for 7 days under these conditions and subjected to initial adhesion, outdoor exposure, and anti-slip tests.

Table 7 Formulation Examples (Units: I6) Example: Using a linear acetate sphenol type Nyxy resin with an equivalent weight of 0 to 1000% and activated water as a crosslinking agent (A2N adduct of 00%) A resin composition was obtained by mixing a resin and a crosslinking agent at a high ratio.

A coating composition having the composition shown in Table 3 was then prepared. Similarly, a coating composition outside the scope of the present invention was also prepared for comparison.

. Next, the surface of the hot-dip galvanized steel sheet was coated and painted so that the dry film thickness was ISO microns. ! It was dried for 1 day under the condition of 11 mH and subjected to a comparative test.

Table-C Formulation example (unit 2 parts) Comparative experiment 1 (adhesion test) Using test pieces of the present invention samples 47 to 9 and comparative samples 47 to S obtained as described above, initial zinc plating was performed. To test the adhesion of a paint film to a surface.

Using a cutter knife, make 11 vertical and 11 horizontal cutting lines that cross at right angles to the galvanized surface at 3-inch intervals on the coating film, forming 100 squares. Next, apply cellophane to the squares. was crimped, the cellophane cheese was instantly peeled off, and the remaining number of squares was expressed as a percentage.

On the other hand, using another specimen, two cutting lines reaching the galvanized surface diagonally crossing in the center of the specimen were made, and the specimen was exposed outdoors for three years. After 3 years had passed, the coating surface was observed to confirm the presence or absence of coating defects and abnormalities, and then the remaining coating film of the same specimen was treated in the same procedure as the initial adhesion test. Adhesion after long-term exposure was determined by the evaluation method.

The results obtained are shown in Table 3.

Comparative Experiment (Sliding Test) Using the test pieces of Sample 4;/-9 of the present invention and Comparative Sample 4/-5 obtained as described above. ! X! tX,
Place a t1-shaped rubber plate with a hook on the surface of the specimen, and
/Five plate surface/A Yuno weight was placed on it. Rubber plate hook [1
4 Attach a spring balance υ, pull the spring balance in a direction horizontal to the specimen), and measure the force when the rubber plate starts to move (m”).
(read the scale of a spring scale).

The results obtained are shown in Table 1.

It is clear from the above comparative experiment results that the coating layer obtained from the coating composition of the present invention not only has the effect of imparting adhesion to the galvanized surface but also prevents the coating surface from slipping. The effects are also very good.

Therefore, the coating film has excellent anti-corrosion effect and long-term adhesion, so it is possible to maintain the zinc coating surface for a long period of time, and it also has excellent anti-slip effect. It is also effective in ensuring safety when going up and down the tower.

Applicant: Dainippon Toyo Co., Ltd.

Claims (1)

[Claims] (a) Aki V1M! Ii! or I Refrethane resin composition 100 parts by weight, 011
) Metal IIL candy powder・・・・・・・・・・s~koSO parts by weight, (@) Calcium leadate・・・・・・・・・
...j-100 parts by weight, and (sl) at least one component selected from flat pigments and aggregates
A coating composition for power transmission towers comprising a proportion of 70 to 300 parts by weight.