JP2001348688A - Metallic rust-inhibiting polymer composition and metallic rust-inhibiting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a metallic rust-inhibiting polymer composition using a harmless, easy-to-handle and inexpensive rust inhibitor, and to provide a metallic rust-inhibiting method. SOLUTION: One hundred pts.wt. of a polymer is mixed with 0.02-50 pts.wt. of slaked lime to form a metallic rust-inhibiting polymer composition. A metal is put in a bag formed by the composition or covered with a body formed of the composition such as a sheet to prevent the metal from rusting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rust-preventing polymer for producing a molded product such as a film used for preventing metals such as iron and iron products from rusting during storage or transportation. The present invention relates to a composition and a method for preventing metal rust.

[0002]

2. Description of the Related Art There are various causes of rust, but the most common one is that, for example, iron and iron products come into contact with air containing moisture, and air and carbon dioxide dissolve into the moisture adhering to these surfaces. In these cases, the surface is oxidized by these actions to generate iron rust (black rust (ferrous hydroxide) and red rust (ferric hydroxide)). Rust gradually progresses from the surface to the inside, causing corrosion.

In order to prevent rust and corrosion, in the case of iron products, the surface is usually plated or a rust preventive paint is applied. When a metal material such as a steel material is stored or transported, rust prevention treatment such as applying oil to the surface or wrapping it with rust prevention paper or the like is performed.

[0004]

SUMMARY OF THE INVENTION A film or sheet comprising a polymer as a kind of rust-preventing paper, containing a polymer and a special organic amine such as dicyclohexylamine nitrite having a high volatility as a rust-preventive agent, or a salt thereof. It has also been used. In this case, a steel material or the like is put in a bag or the like formed of a film or the like made of the above-described composition, and contact with the outside air is shut off by heat-sealing the opened portion, and the organic amine and the like are gradually removed in the bag. The rust-preventing action is exhibited by being adsorbed on the metal surface which is vaporized (naturally vaporized in the atmosphere). Although this method is preferable from the viewpoint of rust preventive effect, organic amines as rust preventive agents are often toxic and have a strong vaporization property. It is harmless and easy to handle because it is difficult to handle in terms of safety and health, and because it is more expensive,
In addition, an inexpensive rust inhibitor has been demanded.

Accordingly, an object of the present invention is to use a rust preventive agent itself which is non-toxic, easy to handle, and capable of preventing metal rust. An object of the present invention is to provide a metal rust-preventive polymer composition and a method for preventing metal rust. The present inventors have conducted intensive studies to achieve the above object, and as a result, are safe substances listed in the food additive list, do not generate harmful gases at the time of processing or use of molded articles, and naturally occur in Japan. Since it is produced in large quantities, it has been found that slaked lime, which is an inexpensive material, has an excellent rust-preventing effect when mixed with a polymer, and the present invention has been completed.

[0006]

According to the present invention,
A metal composition is prepared by mixing slaked lime at a ratio of 0.02 to 50 parts by weight per 100 parts by weight of a polymer, and the metal is covered with a molded article made of the above polymer composition. A rust prevention method for a metal is provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to embodiments of the present invention. The metal rust-preventive polymer composition of the present invention is used for the production of a molded article such as a film in which rust prevention of a metal becomes possible by using the same. They are distributed. As the polymer forming the polymer matrix in the present invention, any polymer can be used as long as slaked lime is dispersible and the composition in which slaked lime is dispersed can be formed into various molded articles such as sheets or films. Is not particularly limited. For example, vinyl polymers such as vinyl chloride resins and polyvinyl alcohol; polyethylene, polypropylene, polystyrene, EVA, poly (4-methylpentene-1), ethylene / tetracyclododecene copolymer, polybutene-1
Olefin-based polymers such as 1,2-polybutadiene;
Styrene resins such as AS resin, ABS resin, methacrylate / styrene copolymer resin; methacrylate resins such as polymethyl methacrylate; polyacetal, PE
T, polyester such as polybutylene terephthalate (PBT), polyarylate, polycyclohexylene dimethyl terephthalate, hydroxybenzoic acid polyester, polycarbonate, polyether carbonate; polyamide such as nylon 6, nylon 66; ethylene trifluoride chloride resin; Fluorinated resins such as hydrogenated ethylene propylene resin and ethylene / tetrafluoroethylene copolymer; and thermoplastic polymers such as polyallyl sulfone and polyetherimide.

The polymer composition for metal rust prevention of the present invention is prepared by mixing the above-mentioned polymer and slaked lime using a mixer such as a mixing roll, a Banbury mixer, a kneader or a Henschel mixer. Is produced by kneading the polymer in a molten state with slaked lime and granulating into a pellet, but the method for producing the composition is not particularly limited. Slaked lime is 0.02 to 100 parts by weight of polymer
Used in a proportion of 50 parts by weight. If the amount is too small, the rust-preventing effect cannot be obtained, and if the amount is too large, the rust-preventing effect is saturated and uneconomical. Preferably it is 1 to 20 parts by weight.

[0009] Slaked lime has a mixing or kneading temperature of 100.
C. or more, water is generated, and a molded article using the obtained composition may foam and a good molded article may not be obtained. Therefore, quick lime (Ca) is added together with slaked lime (Ca (OH) ₂ ).
O) is preferably used in combination. Quicklime absorbs the water generated from slaked lime and becomes slaked lime. In this case, quicklime is used in a ratio of 0.1 to 40 parts by weight, preferably 1 to 10 parts by weight, per 100 parts by weight of slaked lime. In addition, the composition, if necessary, fillers, processing aids such as lubricants, coloring agents,
A stabilizer and the like can be appropriately added.

[0010] In order to prevent metal rust using the metal rust-preventing polymer composition of the present invention, a molded article is formed using the composition, and the metal is covered with the molded article. The type of the compact and the method of covering the metal with the compact are not particularly limited, and any method may be used as long as the metal is covered with the compact.
Further, the metal and the molded body need not necessarily be in close contact with each other. For example, a method in which metal is put into a bag made of a film or sheet as a molded body and the opening is heat-sealed (if the film or sheet is uniaxially or biaxially stretched, it can be thermally shrunk); A method of wrapping a metal with a film or a sheet as above and sealing the opening with heat sealing or adhesive tape; forming a container with a lid (arbitrary in shape) capable of storing the metal as the molded body, and putting the metal in the container. A method of sealing the lid and the container body with an adhesive tape or the like; covering the inner surface of the lidded container formed of a material other than the composition of the present invention with a sheet formed of the composition of the present invention,
A method in which a metal is put in this container and sealed with an adhesive tape or the like can be used. Further, a method in which a paint using the metal rust prevention polymer composition is applied to the metal surface and a coating film is directly formed on the metal surface is also used.

The metal in the present invention includes a metal material such as a steel material, and a processed product of the metal material (for example, a product such as a pipe before plating or painting, various parts, and an assembly thereof). The metal material also includes other metals such as iron, copper, and aluminum.

[0012]

Next, the present invention will be described specifically with reference to examples and comparative examples. Parts and ratios in the following text are based on weight.

Example 1, Comparative Example 1 Each component was kneaded and pelletized with a 45 mm twin screw extruder according to the following formulation (Table 1). These pellets and low-density polyethylene were mixed and kneaded at a ratio of 20:80 using a tumbler, and the obtained composition of the present invention was formed into a 0.05 mm-thick film by an inflation extruder.

[0014]

The above film is heat-sealed and 20 cm
A bag of × 40 cm was prepared. For comparison, a bag was made only of low-density polyethylene. As a metal material in these bags, carbon steel for machine structure (5 cm × 10 cm × 0.5
cm plate-shaped pieces were washed and degreased with acetone).
Heat sealed. In another bag, a tin-plated plate was put. These bags were placed in a thermo-hygrostat at 50 ° C. and 95% RH, and the number of days until rust was generated was observed. Table 2 shows the observation results.

[0016] From the results in Table 1, it can be seen that a low-density polyethylene bag containing slaked lime can provide a remarkable rust prevention effect.

[0017]

According to the present invention described above, metal is stored in a bag or the like made of a polymer composition containing a non-toxic, non-vaporizable, easy-to-handle, and inexpensive anti-bacterial formulation. The present invention provides a metal rust-preventive polymer composition in which rust prevention is significantly suppressed.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masato Honjo 1-7-6 Bakurocho, Nihonbashi, Chuo-ku, Tokyo Dainichi Seika Kogyo Co., Ltd. F-term (reference) 4F071 AA01 AB18 AE22 AF02 AH19 BC01 4F100 AA18A AA18H AB01B AB03 AB10 AB17 AK01A AK06 AK15 AK21 BA02 CA14A DD32 JB02A JL05 YY00A YY00H 4J002 AC041 BB021 BB121 BB171 BC021 BD031 BD121 BE021 BG061 BN151 CB001 CF051 CF161 CF181 CG001 CL141

Claims (2)

[Claims] 1. An amount of slaked lime per 100 parts by weight of a polymer of 0.1%.
A polymer composition for preventing metal rust, which is blended in a proportion of from 02 to 50 parts by weight. 2. A method for preventing rust on a metal, comprising covering the metal with a molded article comprising the polymer composition according to claim 1.