JP6966153B2 - Anticorrosive composition - Google Patents

Description

The present invention relates to a rust preventive composition, and more particularly to a rust preventive composition that can be suitably used for short-term rust prevention in mold molding.

Common rust preventives include rust preventive oils and vaporizable rust preventives. Rust-preventive oil is an oil or fat that prevents discoloration or rusting in the atmosphere by applying it to the metal surface of a rust-preventing object to form an oil film. The method of temporarily protecting metal products from rust by applying rust preventive oil has been used in a great many fields since ancient times because it is easy and inexpensive and does not require special technology.

On the other hand, the vaporizable rust preventive agent itself gasifies and fills the closed space, and exerts a rust preventive effect on the metal surface of the rust preventive object in the closed space. Further, the vaporizable rust preventive does not need to be applied directly because the gasified rust preventive component covers the metal surface. Further, when the rust preventive object is taken out of the closed space, it is not necessary to remove the used rust preventive agent, or the removal is very easy.

For example, Patent Document 1 and Patent Document 2 describe a powdery vaporizable rust inhibitor or a granular or tablet-shaped vaporizable rust inhibitor containing a binder. Further, Patent Document 3 describes a pellet-shaped vaporizable rust preventive agent in which thermoplastic resin particles are impregnated with a foaming agent and a rust preventive agent. Patent Document 4 describes a vaporizable rust preventive agent containing butinediol as a rust preventive agent component and contained in a breathable bag.

However, in vaporizable rust preventives, the rust preventive component easily diffuses into the atmosphere, so even if the rust preventive component is sprayed on a specific part of the rust preventive object, the rust preventive component does not remain as a film and most of it is in the air. Spread. Therefore, if the vaporizable rust preventive is not applied in a closed space, the amount of the rust preventive component diffused into the atmosphere increases, and a satisfactory rust preventive effect cannot be obtained. Therefore, the vaporizable rust inhibitor is generally effective in a closed space, but has a drawback that it is difficult to apply in an open space.

Therefore, the vaporizable rust preventive agent proposed in view of the above circumstances is disclosed in Patent Document 5. According to Patent Document 5, by containing a predetermined phospholipid and a vaporizable rust preventive, it is a vaporizable rust preventive having a high rust preventive effect that can be used not only in a closed space but also in an open space. be able to.

Japanese Unexamined Patent Publication No. 2001-031966 Japanese Unexamined Patent Publication No. 2003-213462 Special Fair 02-57092 Japanese Unexamined Patent Publication No. 09-031672 Japanese Unexamined Patent Publication No. 2015-124392

By the way, a rust preventive composition may be applied to a molding die used for plastic molding, and molding may be performed in a short period of time using the molding die. In that case, the rust preventive composition is required to impart rust preventiveness to the molding die in a short period of time. However, if molding is performed within a short period of time from the rust prevention treatment using a molding mold coated with the rust preventive composition, the components in the rust preventive composition, particularly the vaporizability, are formed in several slots at the initial stage of molding. A phenomenon occurs in which the rust inhibitor component is transferred or transferred to the molded product.

A molded product to which a vaporizable rust inhibitor has been transferred or transferred cannot be used as a product because it becomes a defective product. Therefore, when molding is performed using a molding mold that has been subjected to a rust preventive treatment by applying a rust preventive agent composition, molding is performed in several slots formed by transferring or transferring the vaporizable rust preventive agent. The work of throwing away the product (the initial molded product from the start of the molding operation) is performed.

The discarded molded product is disposed of as a defective product. Therefore, as the number of times of discarding increases, the yield of the molded product decreases. Therefore, from the viewpoint of improving the productivity of the molded product, it is desirable to reduce the number of times of discarding.

The present invention has been proposed in view of the above-mentioned conventional circumstances, and is capable of imparting excellent rust prevention properties to an object and effectively reducing the number of times a molded product is thrown away. It is an object of the present invention to provide an agent composition.

As a result of diligent research to achieve the above problems, the present inventors have conducted the above-mentioned rust preventive composition as long as it contains a specific vaporizable rust preventive and a metal soap in a predetermined ratio. We have found that the problem can be solved and have completed the present invention. Specifically, the present invention provides the following.

(1) The first invention of the present invention contains a vaporizable rust inhibitor, a metal soap, and a solvent, and the vaporizable rust inhibitor is selected from amines, amine salts, and nitrites. It is a rust preventive composition which is at least one kind and the content of the vaporizable rust preventive agent is 1.2 mass% or more and 5.0 mass% or less of the whole composition.

(2) The second invention of the present invention is a rust preventive agent composition used for a rust preventive treatment on a mold used for mold molding in the first invention.

(3) In the third invention of the present invention, in the first or second invention, the metal soap is at least one selected from fatty acid metal salts, and the content of the metal soap is the content of the entire composition. A rust preventive composition having an amount of 0.05% by mass or more and 0.20% by mass or less.

(4) In the fourth invention of the present invention, in any one of the first to third inventions, the solvent is a hydrocarbon solvent, and the content of the solvent is 95.0% by mass of the whole composition. The rust preventive composition is 98.5% by mass or less.

(5) A fifth invention of the present invention is a rust preventive composition further containing a dye in any one of the first to fourth inventions.

(6) In the sixth invention of the present invention, in the fifth invention, the dye contains at least an oil-soluble dye, and the content of the dye is 0.01% by mass or more and 0.2% by mass of the whole composition. The following is a rust preventive composition.

The rust preventive composition of the present invention is a rust preventive composition capable of imparting excellent rust preventive properties to an object, and can reduce the number of times of discarding.

Hereinafter, the rust preventive composition of one embodiment of the present invention (hereinafter, referred to as the rust preventive composition of the present invention) will be described in detail. The present invention is not limited to the following embodiments, and various modifications can be made without changing the gist of the present invention.

<Rust preventive composition>
The rust preventive composition of the present invention is a rust preventive composition containing a vaporizable rust preventive, a metal soap, and a solvent. Specifically, the vaporizable rust inhibitor contained in the rust inhibitor composition of the present invention is at least one selected from amines, amine salts, and nitrite, and contains the vaporizable rust inhibitor. The amount is 1.2% by mass or more and 5.0% by mass or less of the whole composition. The "whole composition" in the present specification means the whole rust preventive composition.

The rust preventive composition of the present invention is suitably used for, for example, metal products, mechanical parts and automobile parts, parts having moving parts, dies for mold molding requiring short-term rust prevention, and the like. Can be done. Then, by applying the rust preventive composition of the present invention to these products and the like, discoloration and generation of rust of these products and the like can be effectively prevented.

Further, since the rust preventive composition of the present invention contains at least one selected from amines, amine salts, and nitrite as a vaporizable rust preventive, it can be easily removed after use. can do.

Further, even when the rust preventive composition of the present invention is applied to a molding die and molded using the molding die, the rust preventive composition can reduce the number of times the molded product is thrown away. be. Therefore, the rust preventive composition of the present invention can be used for general metal products and the like, but can be particularly preferably used for rust preventive treatment on a mold used for mold molding.

Hereinafter, the vaporizable rust inhibitor, the metal soap, and the solvent contained in the rust inhibitor composition of the present invention will be described.

[Vaporizable rust inhibitor]
The vaporizable rust inhibitor is at least one selected from amines, amine salts, and nitrites. By containing at least one vaporizable rust preventive agent selected from amines, amine salts and nitrites in the rust preventive agent composition, excellent rust preventive against the object to which the rust preventive agent composition is applied. It can impart rustiness.

The vaporizable rust inhibitor is not particularly limited as long as it is at least one selected from amines, amine salts and nitrites. Specific examples of preferable vaporizable rust preventives include dicyclohexylamine, cyclohexylamine, methyldicyclohexylamine, ethylenediamine, oleylamine, didodecylamine, benzotriazole triethylamine, diethylamine, tridecylamine, hexamethylenediamine and the like. From the viewpoint of improving the rust preventive property of the object, dicyclohexylamine or methyldicyclohexylamine is particularly preferable.

The vaporizable rust preventive is contained in a proportion of 1.2% by mass or more and 5.0% by mass or less of the entire composition. If the content of the vaporizable rust preventive agent is less than 1.2% by mass of the entire composition, sufficient rust preventive properties cannot be imparted to the object to which the rust preventive agent composition is applied, and the rust preventive effect can be obtained. It cannot be maintained for a long time. On the other hand, when the content of the vaporizable rust preventive agent is more than 5.0% by mass of the entire composition, the rust preventive agent composition is vaporizable especially when it is used for short-term rust prevention in mold molding. It is not preferable because the rust preventive is easily transferred or transferred to the molded product and the number of times of discarding is increased.

The upper limit of the content of the vaporizable rust preventive is preferably 3.0% by mass or less, more preferably 2.0% by mass or less, and 1.9% by mass or less. Is even more preferable.

[Metal soap]
The metal soap is a salt containing a fatty acid or an organic acid such as 2-ethylhexanoic acid, naphthenic acid, or loginic acid, and a metal. The rust preventive composition of the present invention contains a metal soap together with the above-mentioned vaporizable rust preventive.

Here, in the conventional rust preventive composition, in order to effectively impart rust preventiveness to the object, the content of the vaporizable rust preventive agent contained in the rust preventive agent composition is at least the entire composition. It has been considered that 2.0% by mass or more is required. However, according to the research of the present inventor, by including the metal soap together with the vaporizable rust preventive in the rust preventive composition, even if the content of the vaporizable rust preventive is reduced, the rust preventive effect is obtained. It was found that the decrease can be suppressed. Further, by incorporating the metal soap in this way to reduce the content of the vaporizable rust preventive agent, when the rust preventive agent composition is applied to the molding die, the number of times the molded product is discarded is more effective. Can be reduced to.

According to the rust preventive composition of the present invention, it is possible to effectively impart rust preventive properties over a long period of time, reduce the number of times the molded product is discarded, and impart these two characteristics in a well-balanced manner. can do.

The metal soap is not particularly limited as long as it is a salt containing an organic acid and a metal. For example, specific examples of the metal soap include calcium 1,2-hydroxystearate, calcium oleate, calcium phosphate, calcium laurate, calcium behenate, calcium octanate and the like. Among them, calcium palmitate, calcium oleate, and calcium octanate are particularly preferable from the viewpoint that the above-mentioned two characteristics can be imparted to the object to be coated in a well-balanced manner.

The content of the metal soap is not particularly limited, but is preferably 0.05% by mass or more of the entire composition. When the content is 0.05% by mass or more of the whole composition, the above-mentioned two characteristics can be imparted in a more balanced manner. The upper limit of the content of the metal soap is preferably 5.0% by mass or less, and more preferably 1.0% by mass or less of the entire composition.

[solvent]
The solvent is not particularly limited as long as it is a solvent capable of dissolving the constituent components in the composition such as a vaporizable rust inhibitor and metal soap. Specifically, it is preferable that a hydrocarbon solvent such as cyclohexane, isohexane, n-heptane, isooctane, and isoparaffin can be used, and isohexane and isooctane are particularly preferable.

The content of the solvent is not particularly limited, but is preferably 80.0% by mass or more, more preferably 90.0% by mass or more, and 95.0% by mass or more of the entire composition. Is particularly preferable. When the content is 80.0% by mass or more of the entire composition, constituent components such as a vaporizable rust inhibitor and metal soap can be effectively dissolved. The upper limit of the solvent content is preferably 98.5% by mass or less of the total composition.

[dye]
Further, in the rust preventive agent composition of the present invention, a dye can be further contained. As the dye, a dye applied to coloring an organic solvent or an oil or fat can be used, and it is preferable that the dye contains at least an oil-soluble dye.

Specific examples of the dye include mono-disazo-based dyes, metal complex salt-type monoazo-based dyes, anthraquinone-based dyes, phthalocyanine-based dyes, and triphenylmethane-based dyes. Such dyes are dyes mainly used for coloring organic solvents, fats and oils and the like. By containing such a dye in the rust preventive composition, when the object to be coated is coated with the rust preventive composition and subjected to the rust preventive treatment, the visibility of the treated portion can be enhanced. , The presence or absence of treatment, the treatment location, the treatment range, etc. can be easily confirmed visually.

The content of the dye is not particularly limited, but is preferably 0.01% by mass or more of the entire composition. When the content is 0.01% by mass or more of the whole composition, the coloring property is enhanced, so that the visibility can be improved. The upper limit of the dye content is preferably 0.2% by mass or less of the entire composition. By setting the content of the dye to 0.2% by mass or less of the entire composition, it can be effectively dissolved in the solvent and the dye can be prevented from being transferred to other parts. Therefore, it is possible to prevent the number of throw-aways from increasing.

[Other additives]
In addition, the rust preventive composition of the present invention may contain additives usually blended in the rust preventive composition. For example, an antioxidant, a corrosion inhibitor, an antifoaming agent, a hard cake inhibitor, a sedimentation inhibitor, and various other additives can be arbitrarily selected and blended. In addition, the contents of these various additives can be arbitrarily determined according to the required performance.

<Manufacturing method of rust preventive composition>
The method for producing the rust preventive composition of the present invention is not particularly limited, and it can be produced by a known method. For example, a vaporizable rust inhibitor weighed to a predetermined composition content, a metal soap, a solvent, and an additive to be added as needed are mixed, and these components are dissolved in the solvent. It can be manufactured by letting it.

When dissolving in a solvent, it is preferable to heat and mix at a temperature lower than the boiling point of the vaporizable rust inhibitor from the viewpoint of improving its solubility. Further, it is preferable to perform mixing while stirring using a known stirring device.

<How to apply the rust preventive composition>
The method of applying the rust preventive composition of the present invention to an object is not particularly limited. For example, a method of blending a propellant or the like to form an aerosol or the like and spraying it onto an object to be coated can be mentioned.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples.

"Rust prevention evaluation: salt spray test (based on JIS K 2246)"
The rust prevention property was evaluated by performing a spray test using a salt spray test device. The salt spray test is a test for examining the degree of rust generation after applying a rust preventive composition to a test piece and holding it in a device sprayed with salt water at a temperature of 35 ° C. for a predetermined time. In this test, the test piece was a steel plate (surface polished with # 240) and the salt water concentration was 5%. The process was terminated when the entire test piece rusted, and the time during which rust did not occur and the time during which the entire test piece rusted were recorded (listed in the "rust prevention" column in Table 1). It should be noted that the longer these rust generation times are, the more excellent the rust preventive property can be imparted to the object, which means that the composition is a rust preventive agent.

"Evaluation of throw-away property"
After drying the pellets of polycarbonate (Panlite L-1225Y) at 120 ° C. for 4 hours, the melting temperature was 280 ° C. and the injection pressure was 1200 kg / cm ² using an injection molding machine (manufactured by Nissei ASB Machinery Co., Ltd.). An evaluation test piece (transparent plate of 90 × 50 × t1 mm) was molded at a mold temperature of 80 ° C. At this time, the rust preventive composition was applied to the mold side before molding. As an evaluation method, the surface of the evaluation test piece coated with the rust preventive composition was observed to confirm the presence or absence of oil (rust preventive composition), and then molding was repeated until the surface of the test piece was free of oil. .. Then, the number of shots when the oil content (rust preventive composition) disappeared on the surface of the test piece was recorded (listed in the column of "discarding" in Table 1). It should be noted that the smaller the number of shots, the more the rust preventive composition can reduce the number of times of discarding.

Next, each example and comparative example will be described.
[Example 1]
In Example 1, dicyclohexylamine and partimine are contained so that the vaporizable rust inhibitor has 3.0% by mass of dicyclohexylamine, the metal soap has 0.10% by mass of calcium partimate, and the solvent normal heptane has 96.9% by mass. After heating and mixing calcium acid at 80 ° C., normal heptane was added and stirred to prepare a rust preventive composition.

[Example 2]
In Example 2, the rust preventive composition was prepared in the same manner as in Example 1 except that the content was 4.0% by mass of methyldicyclohexylamine, 0.12% by mass of calcium oleate, and 95.88% by mass of isooctane. Made.

[Example 3]
In Example 3, the rust preventive composition was prepared in the same manner as in Example 1 except that dicyclohexylamine was 1.5% by mass, calcium octanate was 0.05% by mass, and isohexane was 98.45% by mass. Made.

[Example 4]
In Example 4, the rust preventive composition was prepared in the same manner as in Example 1 except that the content was 4.9% by mass of methyldicyclohexylamine, 0.15% by mass of calcium oleate, and 94.95% by mass of isohexane. Made.

[Comparative Example 1]
In Comparative Example 1, a vaporizable rust inhibitor was added to the solvent and stirred so that the vaporizable rust inhibitor dicyclohexylamine was 4.0% by mass and the solvent isohexane was 96.0% by mass. A composition was prepared.

[Comparative Example 2]
Comparative Example 2 is the same as Comparative Example 1 except that the vaporizable rust preventive agent is dicyclohexylamine 3.0% by mass, the phospholipid soybean lecithin is 3.0% by mass, and cyclohexane is 94.0% by mass. A rust preventive composition was prepared.

[Comparative Example 3]
In Comparative Example 3, a rust preventive composition was prepared in the same manner as in Example 1 except that methyldicyclohexylamine was 4.0% by mass and isooctane of the solvent was 96.0% by mass.

[Comparative Example 4]
In Comparative Example 4, dicyclohexylamine and partimine were contained so that the vaporizable rust inhibitor dicyclohexylamine was 6.0% by mass, the metal soap was calcium partimate 0.20% by mass, and the solvent normal heptane was 93.8% by mass. After heating and mixing calcium acid at 80 ° C., normal heptane was added and stirred to prepare a rust preventive composition.

[Comparative Example 5]
In Comparative Example 5, the vaporizable rust inhibitor was dicyclohexylamine 1.0% by mass, the metal soap was calcium oleate 0.03% by mass, and the isohexane was 98.97% by mass. Similarly, a rust preventive composition was prepared.

From the results shown in Table 1, rust prevention was performed using the rust preventive composition of Examples 1 to 4 containing a vaporizable rust preventive of 1.2% by mass or more and 5.0% by mass or less and a metal soap. By the treatment, it was possible to impart excellent rust prevention to the object and effectively reduce the number of times of discarding.

In particular, the rust preventive composition of Example 3 containing 1.5% by mass of dicyclohexylamine (vaporizable rust preventive) has a lower content of the vaporizable rust preventive than other examples. , Has the same characteristics as other examples in the rust prevention evaluation. It can be seen that the inclusion of the metal soap in the rust preventive composition reduces the decrease in the rust preventive property of the object even though the content of the vaporizable rust preventive agent is small.

On the other hand, it can be seen that the rust preventive composition of Comparative Example 1 and Comparative Example 3 containing no metal soap is less effective in terms of both rust preventive property and throw-away property. Further, although the rust preventive composition of Comparative Example 2 containing soybean lecithin instead of the metal soap has excellent rust preventive properties, the throw-away property is lower than that of the examples. Further, the rust preventive composition of Comparative Example 4 in which the content of the rust preventive composition exceeds 5.0% by mass has a reduced throw-away property, and the content of the rust preventive composition is 1.2. The rust preventive composition of Comparative Example 5 having a mass% of less than% had a reduced rust preventive property.

From the above results, the rust preventive composition containing a predetermined amount of the vaporizable rust preventive agent and the metal soap can impart excellent rust preventive properties to the object and effectively discard the number of times. It was found that it can be reduced to.

Claims (5)

Contains a vaporizable rust inhibitor, metal soap, and solvent,
The vaporizable rust inhibitor is at least one selected from amines, amine salts, and nitrites, and the content of the vaporizable rust inhibitor is 1.2% by mass or more of the entire composition. It is 0% by mass or less,
The metal soap comprises only one selected from fatty acid metal salts, and the content of the metal soap is 0.05% by mass or more and 5.0% by mass or less of the whole composition.
A rust preventive composition used for rust preventive treatment on a mold used for mold molding. The rust preventive composition according to claim 1, wherein the solvent is a hydrocarbon solvent, and the content of the solvent is 80.0% by mass or more and 98.5% by mass or less of the entire composition. The rust preventive composition according to claim 1 or 2, further comprising a dye. The rust preventive composition according to claim 3, wherein the dye contains at least an oil-soluble dye, and the content of the dye is 0.01% by mass or more and 0.2% by mass or less of the entire composition. The rust preventive composition was applied on the molding die for use in plastic molding, when performing molding using a molded metal mold, who you dispose of moldings in the initial several slots from the forming operation start method And
The rust preventive composition contains a vaporizable rust preventive, a metal soap, and a solvent.
The vaporizable rust inhibitor is at least one selected from amines, amine salts, and nitrites, and the content of the vaporizable rust inhibitor is 1.2% by mass or more of the entire composition. It is 0% by mass or less,
A method in which the metal soap comprises only one selected from fatty acid metal salts, and the content of the metal soap is 0.05% by mass or more and 5.0% by mass or less of the entire composition .