JPS6149344B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to metal products such as automobiles, industrial machinery,
The present invention relates to rust-proof packaging products used to prevent rust of precision machinery, cutlery, and their parts, and particularly to rust-proof packaging products using volatile rust preventive agents.

[Conventional technology]

Traditionally, volatile rust inhibitors can prevent corrosion caused by the atmosphere by simply placing them in the packaging of the object (object to be rust-prevented) and chemically or physically adsorbing or reacting with the metal surface. Therefore, it is often used for rust-proof packaging because it is simple. In particular, it is used for equipment and parts that cannot use rust preventive oil, for equipment that has a long or uncertain storage or transportation period for export, and for rust prevention control of precision equipment and electronic equipment. has been done.

Volatile rust inhibitors are usually used in the form of powders, tablets, sachets, alcoholic or aqueous solutions, anticorrosive paper coated on or impregnated with paper or cloth, and the like.

However, since volatile rust preventive agents evaporate at room temperature, simply spraying or applying a powder or solution form of a volatile rust preventive agent to the target object will evaporate in a very short period of time and prevent the product from being completely protected. There is a problem that the rust effect is lost.

Therefore, usually after spraying or applying a volatile rust preventive agent to the metal product to be rust-prevented, or by packaging the metal product together with tablets or anti-rust paper to prevent the vaporized rust preventive agent from escaping, the rust preventive agent is usually applied. It's packaged. The rust prevention life of a volatile rust inhibitor varies significantly depending on the condition of the exterior packaging, and the lifespan of volatile rust inhibitors is about ten to several dozen times longer when simply wrapped with paper and when sealed with film or aluminum foil. The rust prevention life will be different.

However, in any case, it is necessary to prepare a packaging material in addition to the volatile rust preventive agent, and for the reasons mentioned above, the packaging must be done in a way that prevents the vaporized rust preventive agent from escaping as much as possible. Moreover, packaging is time-consuming and troublesome. Moreover, powder or solution types require time and effort to spray or apply the volatile rust preventive to the target object. In addition, if the powder is used, the powder remains attached to the target object, which may cause equipment performance failure if the target object is precision equipment.
It may spoil the aesthetic appearance. On the other hand, tablets and sachets do not require the effort of spraying or coating, but they have almost no anti-corrosion effect unless they are packaged. Furthermore, when an object is wrapped in anti-rust paper, if the object has an uneven structure, the anti-rust paper may be torn and paper waste may adhere to the object and remain stuck.

[Problem that the invention seeks to solve]

The present invention solves the conventional problems mentioned above, namely, the rust preventive effect is lost in a short period of time, it takes time and effort to spray and apply the rust preventive, and a part of the rust preventive paper remains attached to the object. This is an attempt to solve problems such as.

An object of the present invention is to provide a rust-proof packaging product that can maintain its rust-proofing effect for a long period of time. More preferably, the object is to provide a rust-proof packaging product that also functions as a packaging material.

[Means for solving problems]

The present invention provides a rust preventive product characterized in that a paste or powder containing a cyclodextrin clathrate compound, which is a volatile rust preventive agent, is mixed with a thermoplastic synthetic resin material and the mixture is molded. The above objective is achieved by a synthetic resin product for packaging.

It is preferable that the synthetic resin product for anti-rust packaging is a film-like product, a molded product molded into a shape suitable for storing the object to be rust-prevented, or a foam, which has both anti-rust function and packaging function. .

[Effect]

In the synthetic resin product for rust-proof packaging of the present invention,
Volatile rust inhibitors are mixed into synthetic resin materials,
Since volatile rust inhibitors gradually evaporate, they maintain a certain level of rust prevention effect for an extremely long period of time.

Furthermore, by making the volatile rust inhibitor a cyclodextrin clathrate compound, it becomes chemically very stable and thermally resistant to high temperatures of about 260°C. Therefore, even if it is mixed into a thermoplastic synthetic resin and subjected to molding processing, etc., the volatile rust preventive agent does not decompose during processing. Moreover, this clathrate compound has good dispersibility and compatibility with synthetic resins, and can be mixed uniformly, so that the quality of the synthetic resin product for rust-proof packaging of the present invention is constant.

When the compound resin product for rust-proof packaging of the present invention is made into a film, a molded article in a shape suitable for storing the object to be rust-prevented, or a foam, the object to be rust-prevented may be can be easily packaged.

〔Example〕

The synthetic resin product for rust-proof packaging of the present invention is produced by mixing a pasty or powdery clathrate compound containing a cyclodextrin clathrate compound, which is a volatile rust preventive agent, with a thermoplastic synthetic resin material, and molding the mixture. This is what I did.

As the volatile rust preventive agent used in the present invention, conventionally known ones may be used, such as dicyclohexylammonium nitrite, cyclohexylamine carbonate, diisopropylamine nitrite, hexamethylenetetraamine, benzotriazole, and the like. Rust inhibitors are for steel,
Select an appropriate one, such as one for copper or one for all metals.

The cyclodextrin used in the present invention is α
- Cyclodextrin, β-cyclodextrin, γ-cyclodextrin, cyclodextrin derivatives or mixtures thereof may be used, and powdered ones may be used,
Alternatively, a starch decomposition diagram containing cyclodextrin (for example, Celldex CH-20 manufactured by Nihon Shokuhin Kako Co., Ltd.) may be used.

The cyclodextrin clathrate compound of the volatile rust inhibitor may be produced by a saturated aqueous solution method or a kneading method.

That is, in the saturated aqueous solution method, a clathrate compound is obtained by adding a certain amount of a volatile rust inhibitor to a saturated or supersaturated aqueous solution of cyclodextrin and stirring at a temperature of 70° C. or lower for several tens of minutes to several hours.

In the kneading method, water or hot water is added to cyclodextrin to form a slurry, then the required amount of volatile rust preventive agent is added at a temperature of 70°C or less, and the mixture is thoroughly stirred in a kneader for several tens of minutes to several hours. By doing so, a paste containing the clathrate compound is obtained. In this kneading method, when using powdered cyclodextrin, add warm water (approximately 0.1 to 6 times the weight of cyclodextrin) to the cyclodextrin.
to make a paste or suspension. On the other hand, when using a starch decomposition product containing cyclodextrin or a commercially available starch syrup containing cyclodextrin, the content itself ranges from 25 to 40% to 70%.
It contains ~80% water, so you can add about twice the amount of water or use it as is.

In addition, when the volatile rust preventive agent used is a powder, an appropriate solvent for dissolving the rust preventive agent, such as methanol, ethanol, hot water, etc., is used prior to clathration.
It is best to dissolve it in advance. For example, if the ratio of rust preventive agent and solvent is 1:1 (weight ratio), approximately 50 to 70
Mix by stirring at a temperature of °C. Also, at this time, it is recommended to add a small amount of liquid paraffin.

Moreover, the ratio of the volatile rust preventive agent as a guest and the cyclodextrin as a host is not particularly limited as long as it can clathrate the volatile rust preventive agent. For example, the molar ratio may be about 1:1.

Washing the paste containing the clathrate compound produced by the above-mentioned saturated aqueous solution method or kneading method,
When dried by spray drying, ventilation drying, freeze drying, etc., a powdery clathrate compound is obtained.

Next, the paste-like or powder-like clathrate compound containing the cyclodextrin clathrate compound of the volatile rust preventive agent produced as described above is mixed with a thermoplastic synthetic resin and molded into an appropriate shape. The synthetic resin product for rust-proof packaging of the present invention is obtained.

Suitable thermoplastic synthetic resins to be used include polyethylene, polypropylene, soft polyvinyl chloride, and ethylene-vinyl acetate copolymers.

When mixing a thermoplastic synthetic resin and a clathrate compound, a powdered or pelleted thermoplastic synthetic resin and a powdered clathrate compound may be mixed;
Alternatively, a powdered or pelleted thermoplastic synthetic resin may be mixed into a paste containing the clathrate compound. Alternatively, a powdered clathrate compound is added in advance to a suitable solvent, such as a dimethylformamide solution, mixed and stirred to prepare a cyclodextrin clathrate solution, and a powdered or pelleted thermoplastic synthetic resin is added to this solution. You can also dissolve it by adding

The mixing ratio of the thermoplastic synthetic resin and the cyclodextrin clathrate compound, which is a volatile rust preventive agent, may be appropriate. For example, in the case of powders, the ratio of both is 1:1.
(weight ratio).

A mixture of a thermoplastic synthetic resin and a cyclodextrin clathrate compound, which is a volatile rust inhibitor, may be made into pellets using a tablet machine and used as is, but it may be molded into an appropriate shape by extrusion molding, injection molding, foam molding, etc. It is preferable to use it as a product because it can also be used as a packaging material.

For example, it is made into a film by inflation processing. This film is preferably air permeable and has a thickness of about 30 to 50 microns.

Alternatively, a molded product having irregularities suitable for storing the object to be rust-prevented is made by injection molding. This molded article may have a thickness of 1 to 2 mm.

Further, it may be formed into a sheet-like foam by foam molding, or a molded article for accommodating an object to be rust-prevented.

(Example 1) Volatile rust inhibitor for steel TVI (Crest Chemical Co., Ltd., registered trademark of dicyclohexyl ammonium nitrite): 25 parts by weight, methanol: 25 parts by weight, liquid paraffin: a small amount kept at 50 to 60°C. Stir and mix well. 25 parts by weight of cyclodextrin was dissolved in 50 parts by weight of warm water, and the mixture of the volatile rust preventive agent and methanol was gradually added to this solution at a temperature of 70° C. or lower, followed by mixing and stirring for several hours. The resulting packaging compound was washed with water and dried by spray drying or vacuum drying to obtain a powdery clathrate compound.

50 parts by weight of this powdered clathrate compound and 50 parts by weight of polyethylene molding pellets were mixed and formed into a film by inflation processing.

(Example 2) Volatile rust inhibitor for copper CVI (Celeste Chemical Co., Ltd., registered trademark of benzotriazole): 20 parts, ethanol: 25 parts by weight, liquid paraffin: a small amount of 50 parts
The mixture was stirred and mixed well at a temperature of ~60°C. Celldex CH-20 (Nippon Shokuhin Kako Co., Ltd., cyclodextrin starch syrup): 80 parts by weight, and water: 80~
160 parts by weight were mixed, and a mixed solution of the volatile rust preventive and ethanol was gradually added to this solution at a temperature of 70° C. or lower, followed by mixing and stirring for several hours. The produced clathrate compound was washed with water and dried by spray drying or vacuum drying to obtain a powdery packaging compound.

This powdered clathrate compound: 10 parts by weight and polypropylene molding pellets: 90 parts by weight were mixed,
Then, by injection molding, a molded product having a thickness of 1 to 2 mm and having irregularities suitable for accommodating the object to be rust-prevented was made. In this case, a molded product may be used as a set consisting of a container part and a lid part with a recess that almost completely accommodates the object to be rust-prevented, or a part of the object to be rust-prevented may be made into a set such as a well-known egg pack. A container part with a recess for accommodating the rest of the object and a container part with a recess for accommodating the remaining part of the object to be rust-prevented are made as a set, and the two container parts are combined and the object to be rust-prevented is placed in the recess. Enabled complete siege and containment.

(Example 3) Anticol A, a volatile rust preventive agent for all metals (Chirest Chemical Co., Ltd., registered trademark): 20 parts by weight, Celldex CH-20 (Nihon Shokuhin Kako Co., Ltd., cyclodextrin starch syrup): 80 parts by weight , and water:
80 to 160 parts by weight were mixed and stirred for several hours at a temperature set at 70°C or lower. The generated clathrate compound was washed with water and dried by spray drying or vacuum drying to obtain a powdery clathrate compound.

This powdered clathrate compound: 10 parts by weight, polystyrene: 90 parts by weight, and a foaming agent were mixed, and a sheet-like foam was formed by foam molding.

〔Effect of the invention〕

Volatile rust inhibitors are easily decomposed by heat, so
In the past, it was unthinkable that it would be mixed into a thermoplastic synthetic resin, but according to the present invention, it is possible to obtain a thermoplastic synthetic resin molded product that has a volatile rust-preventing effect. In the rust-proof packaging product of the present invention,
Since the volatile rust preventive agent is mixed into the synthetic resin material, the vaporization of the volatile rust preventive agent occurs gradually. As a result, a certain rust prevention effect can be maintained for an extremely long period of time.

In the present invention, since the volatile rust preventive agent is a cyclodextrin inclusion compound, the thermoplastic synthetic resin can be molded without the volatile rust preventive agent being decomposed. Moreover, this clathrate compound has good dispersibility and compatibility with the synthetic resin, and can be mixed uniformly, so that the quality of the synthetic resin product for rust-proof packaging of the present invention is constant.

Since the anti-corrosion packaging product of the present invention uses a thermoplastic synthetic resin material, it can be made into any shape, and is therefore suitable for packaging objects to be rust-prevented, such as films and molded products. It can be done.

When the synthetic resin product for anti-rust packaging of the present invention is made into a film, it has adhesion to the object to be rust-prevented, so the object to be rust-prevented can be hermetically packaged, which is much more effective than conventional anti-rust paper. Demonstrates rust prevention effect. Further, unlike conventional anti-rust paper, paper waste does not clog the object to be rust-prevented.

In addition, when the synthetic resin product for rust-proof packaging of the present invention is made into a molded product or a foam having a recess for accommodating the object to be rust-prevented, it itself serves as a packaging material, and the product itself acts as a packaging material. Packaging is extremely easy.

Since the synthetic resin product for rust-proof packaging of the present invention can also serve as a packaging material, there is no need for special sealed packaging. This will make the rust prevention effect last even longer.

Claims (1)

[Claims] 1. A paste or powder containing a cyclodextrin clathrate compound, which is a volatile rust preventive, is mixed with a thermoplastic synthetic resin material, and the mixture is molded. Synthetic resin products for rust-proof packaging. 2. The synthetic resin product for rust-proof packaging according to claim 1, wherein the synthetic resin product for rust-proof packaging is in the form of a film. 3. The synthetic resin product for rust-proof packaging as set forth in claim 1, wherein the synthetic resin product for rust-proof packaging is a molded article molded into a shape suitable for housing an object to be rust-proofed. 4. The synthetic resin product for rust-proof packaging according to claim 1, wherein the synthetic resin product for rust-proof packaging is a foam. 5. The synthetic resin product for rust-proof packaging according to claim 1, wherein the synthetic resin product for rust-proof packaging is in the form of pellets. 6. A synthetic resin product for rust-proof packaging according to any one of claims 1 to 5, wherein the thermoplastic synthetic resin material is polypropylene. 7. A synthetic resin product for rust-proof packaging according to any one of claims 1 to 5, wherein the thermoplastic synthetic resin material is polyethylene. 8. The synthetic resin product for rust-proof packaging according to any one of claims 1 to 5, wherein the thermoplastic synthetic resin material is an ethylene-vinyl acetate copolymer. 9. A synthetic resin product for rust-proof packaging according to any one of claims 1 to 5, wherein the thermoplastic synthetic resin material is polyvinyl chloride.