JP2002339086A - Raw material for rust preventive for steel tube and composition thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the drying properties of the raw material for a rust preventive while maintaining strength of a conventional coating film and transparency thereof. SOLUTION: The raw material contains one or more kinds selected from natural resins such as rosin and a guaiac resin or the modified matter thereof. If required, the raw material is blended with; (1) 1 to 20 mass% of one or more kinds of wax components selected from petrolatum, the oxide thereof or the like; or with (2) 10 to 50 mass% of one or more kinds selected from synthetic resins such as a petroleum hydrocarbon resin and/or synthetic resins such as an alkyd resin; or with (3) 1 to 20 mass% of one or more kinds selected from petrolatum, the oxide thereof or the like, and 10 to 50 mass% of one or more kinds selected from synthetic resins such as a petroleum hydrocarbon resin and/or synthetic resins such as an alkyd resin. The raw material for the rust preventive for a steel tube thus obtained of 30 to 70 mass% is diluted with a petroleum solvent and/or an alcolic solvent or a mixed solvent thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material for a rust preventive for steel pipes to be applied to prevent rust on the outer surface generated during storage of oil country tubular goods, oil transfer pipes, boiler tubes, and other general steel pipes, and its use. It relates to a composition.

[0002]

2. Description of the Related Art For example, as a method of rust-proofing the surface of a product other than a steel pipe, conventionally, a drying oil such as linseed oil of a normal temperature or a synthetic resin such as an alkyd resin is diluted with a solvent and applied. A method is employed in which the solvent is evaporated and polymerized and dried at the same time. In this case, it is common to add a drying agent (polymerization initiator) to shorten the drying time,
Among them, lead soap has been awarded as an effective drying agent (polymerization initiator).

On the other hand, rust prevention treatment applied to the surface of a steel pipe is as follows:
In addition to simply preventing rust on steel pipes (rust prevention), various other properties are required. That is, the steel pipe is immediately conveyed to the outdoor part after being coated with the rust-preventive oil, and stored as it is in an outdoor rack, conveyed to a binding site via a conveyor or skid, or piled up in a yard. .

[0004] Therefore, if the time until the drying is long, an oil pool will be formed at the lower part of the steel pipe, and if it is severe, it will fall and contaminate the yard and other equipment, so that the drying time is limited (quick drying property). In addition, if the coating film has no strength (coating film strength), the coating film may be peeled off due to the adhesion or rubbing between the steel pipes, or the film may be dehydrated by wind and rain, which may cause rust. Further, since the steel pipe is coated with a stencil for identifying the type and then coated with a coating, the coating is also required to be transparent (transparency).

Therefore, Japanese Patent Application Laid-Open Nos. 54-101551 and 10-157003 propose a method in which an alkyd resin is used and the drying time is particularly shortened by controlling the temperature. If you want to control
Since the steel pipe has to be heated and cooled, when the steel pipe is long, workability is extremely poor and a large amount of energy is consumed.

[0006] In recent years, the use of lead soap has been avoided due to environmental problems.
From the two aspects of the effect, it cannot follow with other metal soaps (cobalt, germanium, aluminum, calcium) etc., which are drying agents (polymerization initiators) other than lead soap, and lead soap is still used. It is a fact.

Therefore, as a method of forming a dry coating film without using a metallic soap containing lead, for example, Japanese Patent Application Laid-Open No.
An active energy ray-curable resin such as Japanese Patent No. 142742 and Japanese Patent Publication No. 5-21742 has been proposed. However, when various oils adhere to the surface such as a steel pipe, abnormalities in the coating surface such as cissing are observed. Since a problem occurs such that a phenomenon occurs or sufficient adhesion cannot be obtained, it is necessary to completely remove oil from the surface of the steel pipe before painting, which is unsuitable as a rust prevention treatment for the steel pipe.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and maintains the conventional properties of the coating film and the transparency while maintaining the conventional performance without using lead soap. It is another object of the present invention to provide a raw material for a rust preventive agent for steel pipes and a composition thereof having excellent rust preventive property capable of improving the drying property.

[0009]

Means for Solving the Problems In order to achieve the above-mentioned object, the rust preventive raw material for steel pipes according to the present invention contains at least one of natural solid fats such as rosin and guaiac resin or modified products thereof. If necessary, this rust inhibitor raw material
One or more wax components such as petrolatum or an oxide thereof may be blended in an amount of 1 to 20% by mass, or one or more of a synthetic resin such as a petroleum hydrocarbon resin or a synthetic resin such as an alkyd resin may be mixed with 10 to 10% by mass. 50% by mass, or 10 to 50% by mass of a total of at least one kind of a synthetic resin such as a petroleum hydrocarbon resin and a synthetic resin such as an alkyd resin, or petrolatum or an oxide thereof. And 1 to 20% by mass of at least one of the above and 10 to 50% by mass of at least one of a synthetic resin such as a petroleum hydrocarbon resin or a synthetic resin such as an alkyd resin. 1 to 20% by mass of a synthetic resin such as a petroleum hydrocarbon resin, and 10 to 50% by mass of a synthetic resin such as an alkyd resin. And, in this way, when diluted with a solvent and applied to a steel pipe, the coating film formed on the steel pipe maintains the conventional film strength and transparency, without using lead soap. However, the drying property can be improved.

Further, the rust preventive composition for steel pipes according to the present invention comprises the raw materials for rust preventives for steel pipes according to the present invention as described above.
% By mass is diluted with a petroleum solvent and / or an alcohol solvent or a mixed solvent thereof. By doing so, an optimal film thickness can be obtained when applied to a steel pipe, and the drying time can be shortened.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have conducted intensive studies on the above-mentioned problems with the conventional rust preventive raw materials for steel pipes and the compositions thereof, and as a result, without using lead soap, The inventors have invented a raw material for a rust preventive for steel pipes and a composition thereof, which maintains the conventional properties of film strength and transparency, and has excellent drying properties and rust prevention.

That is, the rust preventive raw material for steel pipes according to the present invention contains one or more of natural resins such as rosin, copal, dammar, akaloid resin, giraffe, benzoin and guaiac resin, or modified products thereof. If necessary, 1 to 20% by mass of one or more wax components such as petrolatum, petrolatum oxide, and oxidized wax may be added to the rust inhibitor material, or an olefin obtained by decomposing petroleum at a high temperature. A synthetic resin such as a petroleum hydrocarbon resin or a synthetic resin such as an alkyd resin, which is a polymer of a series of unsaturated hydrocarbons;
Further, a total of at least one of a synthetic resin such as a petroleum hydrocarbon resin and a synthetic resin such as an alkyd resin, which is a polymer of an olefinically unsaturated hydrocarbon obtained by decomposing petroleum at a high temperature, is 10 to 50 in total. 1% to 20% by mass of at least one kind such as petrolatum or an oxide thereof.
And 10 to 50% by mass of at least one kind of a synthetic resin such as a petroleum hydrocarbon resin or a synthetic resin such as an alkyd resin, or one such as petrolatum or an oxide thereof.
1 to 20% by mass of at least one kind, and 10 to 50% by mass of a total of at least one kind of a synthetic resin such as a petroleum hydrocarbon resin and a synthetic resin such as an alkyd resin.

The raw material for the anticorrosive agent for steel pipes according to the present invention does not use lead soap, and is itself a solid and easily dissolved in a solvent. Then, a transparent and smooth rust-preventive coating film having excellent hardness is formed.

In the raw material for a rust inhibitor for steel pipes according to the present invention,
The reason why one or more kinds of wax components such as petrolatum, oxidized petrolatum, and oxidized wax are set to 1 to 20% by mass is 1% by mass.
If it is less than 2, rust resistance cannot be improved, and 2
If it exceeds 0% by mass, not only the film quality becomes soft, but also the transparency becomes poor. According to the study by the present inventors, more preferable results were obtained when the content was 2 to 10% by mass.

Further, in the rust preventive raw material for steel pipes according to the present invention, one kind of synthetic resin such as petroleum hydrocarbon resin which is a polymer of olefinically unsaturated hydrocarbon obtained by decomposing petroleum at high temperature. The reason for setting the above to 10 to 50% by mass is 10
If the amount is less than 50% by mass, the hardness of the coating film cannot be improved, and if the amount exceeds 50% by mass, the film forming property of the coating film deteriorates. According to the study of the present inventors, 20 to 4
More favorable results were obtained when the content was 0% by mass.

In the rust preventive raw material for steel pipes according to the present invention, at least one kind of synthetic resin such as an alkyd resin may
The reason for setting the content to 50% by mass is that if the content is less than 10% by mass, the hardness of the coating film cannot be improved, and if the content exceeds 50% by mass, the drying property deteriorates. According to the study by the present inventors, more preferable results were obtained when the content was 20 to 40% by mass.

Further, in the raw material for a rust preventive for steel pipes according to the present invention, natural resins such as rosin and guaiac resin or modified products thereof may be added to petrolatum or oxides thereof and synthetic resins such as petroleum hydrocarbon resins. When a synthetic resin such as an alkyd resin is mixed, the rust resistance is further improved by adjusting the mixing ratio as described above.

Further, the rust preventive composition for steel pipes according to the present invention comprises the above-mentioned rust preventive raw materials for steel pipes according to the present invention in the amounts of 30 to 70.
For example, a petroleum solvent having a 50% boiling point in the range of 140 to 180 ° C., for example, a mineral terpene, normal paraffin, isoparaffin or the like, and / or an alcohol solvent having a boiling point in the range of 110 to 140 ° C. ,
For example, it is diluted with ethylene glycol monomethyl ether, propylene glycol monomethyl ether, or a mixed solvent thereof.

In the rust preventive composition for steel pipes according to the present invention, the drying time of the coating film is adjusted by changing the type and the mixing ratio by using the evaporability of the solvent used. The film thickness after drying is adjusted by adjusting the resin concentration and the viscosity of the solvent after dilution. The thickness of the dried coating film is adjusted by appropriately mixing the type of wax such as wax and the type of synthetic resin (molecular weight, etc.).

In the rust preventive composition for steel pipes according to the present invention, the raw material for rust preventives for steel pipes according to the present invention is 30 to 70% by mass.
The reason is that if it is less than 30% by mass, the film thickness when applied to a steel pipe is too thin to obtain the necessary rust-preventive properties, and if it exceeds 70% by mass, the viscosity becomes large and the This is because the film thickness becomes too thick and the drying property deteriorates. In our experiments, more favorable results were obtained in the range of 40 to 60% by mass.

The viscosity of the rust preventive composition for steel pipes according to the present invention is not particularly limited as long as the concentration of the rust preventive raw material for steel pipes according to the present invention is adjusted to the above-mentioned range. According to experiments and studies by the inventors, when the viscosity at 25 ° C. is less than 30 × 10 ⁻³ Pa · s, the film thickness after being applied to a steel pipe becomes thin, and the rust prevention becomes poor. 10
^If it exceeds ^-3 Pa · s, the film thickness becomes too thick and the drying property deteriorates, so that it is 30 to 100 × 10 ^-3 Pa · s at 25 ° C.
When adjusted to the range of s, favorable results were obtained.

In the above-described present invention, since the gist is based on consideration for the environment, lead soap which has conventionally been added to quickly mature dry coating films is not added, but lead-free metal soap is not used. There is no problem even if is added.

Examples of the leveling agent for adjusting the dry coating film include polyether-based, polyalkyl-based, silicone oil, silicone varnish, methylpolysiloxane polyalkyloxyd, perfluoroalkyl group-containing oligomer, and polyoxyethylene. Surfactants such as alkyl esters, sorbitan alkyl esters, and polyoxyethylene sorbitan alkyl esters are used, and as an antioxidant that promotes the antioxidant properties of the coating film, 2,6-di-
Tert-butyl-P-cresol (BHT), butylated hydroxyanisole (BHA), 2,2-methylene-bis (4-methyl-6-tert-butylphenol) and the like Phenolic antioxidants, high-molecular phenolic antioxidants such as 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane and α-tocophenol (vitamin E) , Dilaurylthiodipropionate and other sulfur-based antioxidants, triphenylphosphite, 4,4-butylidene-bis- (3-methyl-
Phosphorus-based antioxidants such as 6-t-butylphenyl-di-tridecyl) phosphite; N, N-di-sec-butyl-P-phenylene-diamine (BPA); alkylated diphenylamine; There is no problem even if an amine-based antioxidant is added.

The natural resin constituting the product of the present invention itself has rust-preventive properties itself, but is generally a sulfonate-based rust-preventive agent such as Ca sulfonate, Ba
A rust preventive such as a sulfonate, an amine rust preventive such as an alkylamine such as octadecylamine, or a nonionic surfactant rust preventive such as sorbitan may be added. When these are added, the rust prevention ability can be further improved. The transparency is not impaired even when the above-mentioned substances are blended.

[0025]

EXAMPLES The effects of the present invention will be described below with reference to examples. Table 1 and Table 2 below show the composition, properties and performance of the product of the present invention, and Table 3 shows general commercial products containing lead (alkyd resin: 55.0% by mass, lead-containing metal soap: 2.5% by mass,
(Rust inhibitor: 2.0% by mass, antioxidant: 0.5% by mass, mineral turpentine: 40.0% by mass) and the composition, properties and performance of the comparative product of the present invention.

[0026]

[Table 1]

[0027]

[Table 2]

[0028]

[Table 3]

As shown in Tables 1 to 3 above, it can be seen that all of the examples of the present invention are superior in drying performance to current commercial products containing lead soap. Moreover, since the product of the present invention does not contain lead, it can be said that the product is environmentally friendly.

The viscosities in Tables 1 to 3 are values measured at 25 ° C. with a single cylinder rotational viscometer (JIS K 5400), and the dry film thickness is an electromagnetic film thickness meter (JIS K 5600).
It is a value measured in. The drying property is JIS K5
400 dry to the touch (◎: within 15 minutes, ： １: 15 to 30)
Minutes, Δ: 30 to 60 minutes, ×: 60 minutes or more) and curing and drying (◎: within 1 hour, ○: 1 to 2 hours, Δ: 2 to 4 hours,
X: 4 hours or more). Further, as a result of visually observing the transparency of the coating film, the rust resistance was evaluated by a salt spray test method according to JIS Z 2371 and evaluated according to JIS K 2246. B
Class: ○, Class C: Δ, Class D and Class E: ×).

Table 4 below and FIG. 1 show the results obtained by measuring the relationship between the viscosity and the film thickness by changing the solvent dilution ratio of Example 17 in Table 2 above. If it is out of the range, it can be seen that the film thickness becomes thin and the rust prevention becomes poor, and the viscosity becomes large and the film thickness becomes thick.

[0032]

[Table 4]

[0033]

As described above, the raw material for rust preventives for steel pipes according to the present invention is environmentally friendly because it does not use lead soap, and is itself a solid substance and easily dissolved in a solvent. I do. And when the steel pipe rust inhibitor composition according to the present invention diluted in a solvent is applied to the steel pipe, it is dried in a short time,
When dried, it forms a transparent, smooth, rust-resistant coating with excellent hardness.

[Brief description of the drawings]

FIG. 1 is a diagram showing the results of measuring the relationship between viscosity and film thickness by changing the dilution ratio of a solvent.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 93/00 C08L 93/00 C09D 5/08 C09D 5/08 157/02 157/02 167/08 167 / 08 191/06 191/06 193/00 193/00 (72) Inventor Katsuji Sato 1850 Minato, Wakayama City, Wakayama Prefecture Sumitomo Metal Industries, Ltd.Wakayama Works (72) Inventor Kazuo Tanaka Kanazawa-ku, Yokohama, Kanagawa Prefecture 1-11-16 Fukuura, Palace Chemical Co., Ltd. (72) Inventor Shizuo Mori 1-11-16, Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture F-term in Palace Chemical Co., Ltd. 4J002 AE032 AF021 AF031 AG002 BA013 CF013 EA016 EC016 ED026 FD070 GH02 4J038 BA212 BA221 BA231 CR012 DD232 JA01 JA26 KA06 MA09 NA01 NA02 NA03 NA11 PB14 PC02 4K062 AA01 BB01 BB04 BC01 BC06 BC11 CA04 DA10 FA04 FA20 GA10

Claims (7)

[Claims] 1. A rust preventive raw material for steel pipes containing at least one of natural resins such as rosin and guaiac resin or modified products thereof. 2. The rust preventive raw material for steel pipes according to claim 1, wherein 1 to 20% by mass of at least one wax component such as petrolatum or an oxide thereof is blended. 3. A method according to claim 1, wherein at least one of a synthetic resin such as a petroleum hydrocarbon resin and a synthetic resin such as an alkyd resin is used.
The rust preventive raw material for steel pipes according to claim 1, wherein 0% by mass is blended. 4. A combination of at least one of a synthetic resin such as a petroleum hydrocarbon resin and a synthetic resin such as an alkyd resin,
The rust preventive raw material for steel pipes according to claim 1, wherein the raw material is blended in an amount of 50% by mass. 5. 1 to 20% by mass of at least one kind of petrolatum or an oxide thereof, and 10 to 50% by mass of at least one kind of a synthetic resin such as a petroleum hydrocarbon resin or a synthetic resin such as an alkyd resin. The raw material for rust preventives for steel pipes according to claim 1, wherein 6. An amount of 1 to 20% by mass of at least one kind of petrolatum or an oxide thereof, and a total of at least one kind of at least one kind of a synthetic resin such as a petroleum hydrocarbon resin and a synthetic resin such as an alkyd resin. 2. The composition according to claim 1, wherein the composition is blended by mass%.
Rust inhibitor raw materials for steel pipes as described. 7. A rust preventive agent raw material for steel pipes according to any one of claims 1 to 6, wherein 30 to 70% by mass is diluted with a petroleum solvent and / or an alcohol solvent or a mixed solvent thereof. Rust inhibitor composition for steel pipes.