JPS63210285A - Volatile corrosion inhibitor kit - Google Patents

Abstract

PURPOSE:To produce a volatile corrosion inhibitor inhibiting corrosion over a long period, by mixing a volatile corrosion inhibitor with a water absorbing resin and putting the mixture in a vessel made of a porous film. CONSTITUTION:A volatile corrosion inhibitor is mixed with a water absorbing resin such as starch-polyacrylate resin and the mixture is put in a vessel made of a porous film such as a porous PP film to obtain a volatile corrosion inhibitor kit. At least one among dicyclohexylammonium nitrite, cyclohexylammonium carbamate, diisopropylammonium nitrite, benzotrizole and tolyltriazole is used as the volatile corrosion inhibitor. The mixture is composed of about 5-70pts. wt. water absorbing resin and about 95-30pts.wt. volatile corrosion inhibitor and the amt. of the mixture is regulated to <=about 1/2 of the volume of the vessel. The water absorbing resin absorbs water produced by dew condensation in the vessel and only gas generated from the volatile corrosion inhibitor is released to obtain a significant corrosion inhibiting effect.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a volatile rust preventive agent for rust preventive members such as iron and alloys thereof, non-ferrous metals such as zinc and copper, and alloys thereof.

(Prior Art) Conventionally, parts to be rust-prevented, such as vehicle parts, made of metals and their alloys, etc., have been packaged in packaging materials such as cardboard.
Or, when sealing the container, a rust preventive agent is used to prevent the rust-prevented parts from rusting during storage. Volatile rust inhibitors such as nitrites, amine carboxylates such as cyclohexylammonium carbane-1, and 1- to lyazoles such as benzotriazole are frequently used.

Unlike oil-based rust preventives and water-based rust preventives, these volatile rust preventive agents do not stain the parts to be rust-prevented, and do not require a special process to remove the rust preventive agent after the rust-preventing treatment of the parts is completed. It also has the advantage of being effective in a relatively small amount and being simple to use.

Since the vaporized rust preventive agent prevents rust by bringing the vaporized gas into contact with the surface of the member to be copper-protected, a sufficient amount of vaporized gas for rust prevention is applied to the surface of the member to be rust-prevented. Contactable J: Sea urchins should be packed appropriately or used in a closed container.

(Problems to be Solved by the Invention) However, when a member to be rust-prevented, such as a metal or its alloy, is packed or hermetically sealed in a container, air is also trapped in the packaging material or container. The water vapor present in this trapped air condenses as the outside temperature drops, and this condensed moisture not only adheres to the rust-preventing parts and causes rust, but also absorbs condensed water and deliquesces, and sometimes the rust preventive becomes a semi-liquid and adheres to the rust-prevented parts, contaminating their surfaces, and may even damage the metal of the rust-prevented parts or the type of vaporizable rust preventive. In some cases, the rust-prevented parts may discolor or corrode, resulting in a significant decrease in the value of the rust-prevented parts.
This tendency is remarkable when the material is made of copper or copper alloy.

Therefore, a volatile rust preventive agent is packed inside a bag made of non-woven fabric, and the bag is then housed in a polybrene bag-like container with small holes, and this container is attached to the top or side of the inside of the package. There is a known method for preventing rust preventives from coming into direct contact with metal parts. However, in the case of this method, a rust-preventing effect can be obtained when there is very little moisture generated by condensation inside the package or container, but when a large amount of moisture is generated due to condensation, almost no rust-preventing effect can be obtained. There is an inconvenience.

The purpose of the present invention is to provide a volatile rust preventive material that can absorb water vapor and prevent rust from forming on the surface of metals and their alloys for a long period of time without dissipating condensed water. Ru.

(Means for Solving the Problems) As a result of intensive study on a volatile rust preventive material that achieves the above object, the present inventors mixed a water-absorbing resin with a volatile rust preventive agent, and created a porous structure using this mixture. By storing the agent in a film container, water vapor in the air is absorbed by the water-absorbing resin into the porous film container, and the water-absorbing resin retains the condensed water, preventing the volatile rust preventive agent from deliquifying due to moisture. can be prevented,
Only the vaporized gas of the volatile rust preventive agent is released outside the porous film container and brought into contact with the surface of the rust-prevented parts such as metals and their alloys, providing excellent rust prevention effects on the rust-prevented parts. I found out that.

The present invention was made based on such knowledge, and
It is characterized in that a mixture consisting of a water-absorbing resin and a volatile rust preventive agent is housed in a porous film container.

The water-absorbing resin used in the present invention is semi-liquid or does not become liquid even if it absorbs water sufficiently, that is, it is insoluble.
In addition, any material may be used as long as it does not react with the volatile rust preventive agent described later and does not reduce the rust preventive ability of the volatile rust preventive agent. For example, starch polyacrylate resin is suitable; Examples of Reacrate resins include product names SUNWEET IN-300 and SUNWEET I).
There are I-100, 1000, and 1500 (all manufactured by Sanyo Chemical Industries, Ltd.).

The volatile rust preventive agent is not particularly limited and may be any volatile rust preventive agent commonly used for metals and their alloys, such as nitrites of amines such as dicyclohexylammonium nitrite and diisopropylammonium nitrite. , amine carboxylates such as cyclohexylammonium carbanate, benzotriazole,
Triazoles such as tolyltriazole are preferred;
Each may be used alone, or two or three types may be used in combination.

Next, the mixing ratio of the water-absorbing resin and the volatile rust preventive agent will be explained. , 5 to 70 parts by weight based on the rust prevention period, the type of volatile rust preventive agent and its vapor pressure, the temperature during storage, the amount of water vapor (humidity) in the air during packaging or sealing, water absorption capacity, and economic efficiency,
The remaining 95 to 30 parts by weight is a volatile rust preventive.

Also, if the water-absorbing resin is in the range of 20 to 40 parts by weight and the volatile rust preventive is in the range of 80 to 60 parts by weight, the general usage conditions are fully satisfied, and the total mixed weight is 30 to 10 parts by weight.
If the amount is 0g/foot (the amount of voids in the package or container), the rust prevention effect and water absorption effect can be reliably obtained.

The porous film container may be one that allows water vapor in the air and vaporized gas of the rust preventive to pass through, liquefies due to dew condensation, and does not allow IC moisture to pass through. For example, a polypropylene porous film is suitable. An example of this polypropylene porous film is the product name NFR Sheet 1.
There are 2O3l+ and NFR Sea I to 12ONW (all manufactured by Tokuyama Soda Co., Ltd.). In addition, as for the shape of the porous film container, a bag is suitable because it is easy to fill the mixture of water-absorbing resin and volatile rust preventive agent into the container, and it is easy to handle. It is selected appropriately depending on the shape and size of the alloy. Further, since the water-absorbing resin expands due to water absorption, the total amount of the water-absorbing resin and the volatile rust preventive agent contained in the bag is preferably about 172 or less of the volume of the bag.

(Example) Next, Examples and Comparative Examples of the present invention will be described. To Example 1 - γ, the materials and mixing ratios of the water-absorbing resin and volatile rust preventive agent in Comparative Examples 1 to 16, and the material of the container are shown in Table-1.
It is as follows.

In addition, Zanwet lN-3 on the water-absorbing resin side in Table-1
00 and Zanwet 1N-1000 are manufactured by Sanyo Chemical Industries, Ltd., the porous film in the material column of the container is manufactured by Tokuyama Soda Co., Ltd. under the trade name NFR-12O311, and the nonwoven fabric in the material column of the container is manufactured by Nihon Shigyo Co., Ltd. Heat pack HC was used.

FIG. 1 shows an embodiment of the volatile rust preventive material of the present invention, in which (1) is a bag-shaped porous film container made of, for example, a polypropylene porous film; 2) indicates a mixture in which the water-absorbing resin and the volatile rust preventive agent housed in the porous film container <1) were uniformly mixed as in Examples 1 to 7 in Table 1 above.

Then, 2 g of each of the mixtures of Examples 1 to 7 and Comparative Examples 1 to 16 was packed into a bag with a size of 30 x 30 m, and this was placed on a steel plate [JIS-G-3101, Type 2, Type 5].
S-41, 70x 150x 1.2 (#) ]
, zinc plate Class 1 [JIS-H-4321, ordinary zinc ingot 70X 150X1 (s)], copper plate [JIS-H-31
00, Cl100.70x150X1 (厘)], Aluminum plate [JIS-H-4000, A1050.70X
150 x 1 (m)] and a plastic container [278
x 203 x 55 (s), install the metal plate horizontally in about 31 squares so that it does not stick to the water. Next, the container is sealed with a lid and left in a constant temperature bath maintained at 50±1° C. for 20 days. After 20 days had passed, the bag containing the volatile rust preventive agent was removed from the metal plate, and the presence or absence of contamination and corrosion on the metal surface that was in contact with the bag was observed. The results are shown in Table-2.

Special opening UG3-210285 (5) Volatile rust preventive materials of Examples 1 to 7 in which a mixture of a water-absorbing resin and a volatile rust preventive agent was housed in a porous film bag as shown in Evaluation Table-2. No contamination or corrosion occurred on the metal surface. On the other hand, Comparative Examples 1 to 7 in which only the volatile rust preventive agent was housed in a conventional non-woven fabric bag, and Comparative Examples 12 to 15 in which only the volatile rust preventive agent was housed in a porous film bag. The anti-rust material significantly contaminated the metal surface and caused corrosion on the surface.

In addition, Comparative Examples 8 to 10, in which a mixture of a water-absorbing resin and a volatile rust preventive agent was housed in a bag made of conventional non-woven fabric, and a non-woven bag containing a mixture of silica gel as a water-absorbing agent and a volatile rust preventive agent, were used. Comparative Example 11, in which the mixture was housed inside the body, and Comparative Example 16, in which the same mixture was housed in a porous film bag, showed contamination on the metal surface, even though the mixture itself had water absorption properties.
Corrosion occurred.

That is, it was confirmed that Examples 1 to 7 had a sufficient water absorption effect compared to Comparative Examples 1 to 16, and had an excellent antirust effect on metals and their alloys.

Next, as shown in the second figure, J: Sea urchin is placed in a cylindrical container (+1) made of acrylic resin with a diameter of 10.7 cm and a content of approximately 201 cm containing 200 cc of water W at the bottom as a water-absorbing resin. 1-181000 in 30 parts by weight, cyclohexylammonium jy Rubane 1-1 as a volatile rust preventive agent, and benzotriazole in a weight ratio of 55:20.
Example A in which 2 g of a mixture consisting of 70 parts by weight of the mixture mixed with 70 parts by weight was housed in an NFR-1203H porous film bag (size 50 m x 50 m) manufactured by Tokuyama Soda.
1 or the same amount of the same mixture as Nippon Shigyo Heat Pack H
The anti-corrosive material of Comparative Example A (+21) housed in a bag made of non-woven fabric (size: 50 H x 50 mIn) was placed horizontally to prevent it from adhering to water, 60 cm from the anti-rust UO, 120
A metal test piece (13) was placed in a container (11) above the rust preventive material 0D at a distance of 180 cm and 180 cm, respectively, and the upper end of the container (11) was sealed with bitter a@.
'D was placed in a hot tub aD, the water temperature at the bottom of the container (11) was 49°C, the temperature inside the container (11) was 35-40°C, and the humidity inside the container (ITi) was 95-100%. After 40 days while changing the qD internal temperature within the above range, each metal test piece (13) was taken out from the container (+11) and the state of rusting was observed.The results are shown in Table 3.

Table 5 (1) Material and size of metal test piece SS: Iron plate [
JIS-G-3101, 5S-41, 35x 50x1
．． 2m] Zn: Single-sided galvanized steel sheet [JIS-G-3313, galvanized layer 10. d m, 30x 6ox o,
7mm] 13-Cu: Copper plate [JIS-t(-31(10,C?101
, 30x60x1.0. ] As shown in Table 3, Example A of the present invention uses a bag made of a water vapor or gas permeable film as a porous container for accommodating a mixture of a water absorbent resin and a volatile rust preventive agent. Compared to Comparative Example A in which a bag made of non-woven fabric was used as a porous container, only the vaporized gas of the rust preventive agent could permeate from inside the container even under the severe test conditions mentioned above. It was confirmed that the vaporized gas constantly covers the metal surface and can prevent rust from forming on the metal surface.

Further, the amount of volatilization of Example A and Comparative Example A was measured over time in an open indoor state. The results are as shown in Figure 3.
It was found that Example A volatilized earlier than Comparative Example A, had excellent initial rust prevention ability, and had excellent volatility over a long period of time.

(Effects of the Invention) According to the present invention, since the mixture consisting of the water-absorbing resin and the volatile rust preventive agent is housed in a porous film container, the product of the present invention can be placed in a metal container. When sealed in a package or container together with anti-corrosion materials such as steel and its alloys, the water vapor present in the package or container is absorbed by the water-absorbing resin into the porous film container, and the condensed water is absorbed into the water-absorbing resin. Since the resin can prevent the volatile rust preventive agent from deliquescing due to moisture, only the vaporized gas emitted by the volatile rust preventive agent is released outside the container, and the surface of metals and their alloys is coated. It has the effect of preventing rust from occurring over a long period of time without contaminating or corroding the surface.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an example of the volatile rust preventive material of the present invention, Fig. 2 is a cut side view showing an example of a rust preventive effect testing device, and Fig. 3 is a rust preventive agent. 1 is a graph showing a volatile characteristic curve of . (1) Porous film container (2) Mixture patent applicant Honda Motor Co., Ltd. to 20 30 40 5θ 6
5a Jinohi 2 missing (day)

Claims (1)

[Scope of Claims] 1. A volatile rust preventive material characterized by containing a mixture of a water-absorbing resin and a volatile rust preventive agent in a porous film container. 2. The volatile rust inhibitor is dicyclohexylammonium nitrite, cyclohexylammonium carbanate,
The volatile rust preventive material according to claim 1, which is a rust preventive agent comprising at least one of diisopropylammonium nitrite, benzotriazole, and tolyltriazole. 3. The volatile rust preventive material according to claim 1, wherein the porous film container is a bag made of a water vapor or gas permeable film material.