JPS63122764A - Durable epoxy resin paint - Google Patents

Abstract

PURPOSE:To obtain the titled paint suitable for food, meeting the water-quality standard, resistant to gasoline, ketone and crude oil over a long period and capable of coating a substrate such as iron with a film resistant to strong acid over a long period, by compounding a specific amount of a vinylidene chloride resin emulsion to an epoxy resin paint. CONSTITUTION:The objective paint is composed of (A) 90-99.5% epoxy resin paint (preferably tar-epoxy resin paint) and (B) 0.5-10% vinylidene chloride resin emulsion.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to durable epoxy resin coatings.

[Prior art] Various paints have been proposed for durability, but there are few paints that are resistant to chemicals such as gasoline, ketones, crude oil, strong acids, and strong alkalis. For example, epoxy resin paint can be mentioned. However, even with the epoxy resin paint, the painted surface was not suitable for long-term use.

Furthermore, food-grade paints cannot be used unless they pass strict standards, so paints suitable for food-grade paints are extremely limited.

The present applicant had previously applied for stainless steel-containing epoxy resin paints (Japanese Patent Application No. 12872, 1983, 42578/1983).
No.), concrete painting method (patent application 1980-11541)
No. 4), electrode plate (Japanese Patent Application No. 60-277937), method for forming a chemical-resistant coating (Japanese Patent Application No. 81-25974), electrode plate (Japanese Patent Application No. 1-79242), acid-resistant coating formation Methods (Japanese Patent Application No. 81-114E183) and the like have been filed, and the present invention is related to the inventions related to these applications.

[Problems to be solved by the invention] As mentioned above, conventionally, gasoline, ketone, crude oil,
Since there was no epoxy resin paint that could withstand chemicals such as strong acids and strong alkalis for a long period of time, there was a problem in that there was a need for a paint that was even more durable.

The object of the present invention is to solve these problems and provide a durable epoxy resin paint that can withstand chemicals such as gasoline, ketones, crude oil, strong acids, and strong alkalis for a long period of time and is suitable for food use.

[Means for Solving the Problems] The durable epoxy resin paint according to the present invention has the following configuration in order to solve the conventional problems as described above and achieve the object of the present invention. It is characterized by

That is, the vinylidene chloride resin emulsion is 0.5
% to 10%, and the epoxy resin paint consists of 99.5% to 90%.

The durable epoxy resin paint according to the present invention is from 0.5% to
Vinylidene chloride resin emulsion accounts for 10%.

Examples of vinylidene chloride resin emulsions include:
Saran latex R type L3 manufactured by Asahi Kasei Corporation
21 (trademark). The vinylidene chloride resin emulsion is mixed with an epoxy resin paint that does not contain a curing agent. If the amount of vinylidene chloride resin emulsion added exceeds 10%, the affinity between the vinylidene chloride resin emulsion and the epoxy resin paint will deteriorate, making it impossible to achieve the desired effect, and if the amount added exceeds 10%. 5%
If it is less than 3%, the durability effect will not be sufficient.The most appropriate amount of vinylidene chloride resin emulsion to be added is about 3%. Ethylene glycol monomethyl ether is also suitable as a solvent for an epoxy resin paint containing a vinylidene chloride resin emulsion.

The durable epoxy resin paint according to the present invention is 99.5%
Epoxy resin paint accounts for ~90%. The epoxy resin paint may be a modified epoxy resin paint such as a cool epoxy resin paint containing 5% to 30% tar.

When the durable epoxy resin paint according to the present invention is used, a curing agent for the epoxy resin paint is added and applied by a conventional method. When diluting, ethylene glycol monomethyl ether is suitable as a solvent.

[Example 1] As a durable epoxy resin paint according to the present invention, a paint consisting of 3% vinylidene chloride resin emulsion and 97% epoxy resin paint was used. The test method is J.
Test water was prepared according to the dissolution test method of WWA K-115 water tar epoxy resin paint coating method. However, tap water was used.

The results are shown in Tables 1 and 2 below.
Durable epoxy resin paint according to the present invention [Example 2] As a base material, a hot coil acid or a black-skinned iron plate, which is a hot-rolled steel plate, is used. After degreasing the surface of the iron plate, a stainless steel-containing epoxy resin paint is applied to the surface to form an undercoat portion. A durable epoxy resin paint according to the present invention consisting of 3% vinylidene chloride resin emulsion and 87% epoxy resin paint is applied onto the undercoat area.

When the thus formed coated surface was subjected to a board test, it was found to be 100/100, which was good. In addition, when boiled in tap water for 1 hour, there was almost no abnormality other than a pale white color on the surface. Furthermore, when a board test was conducted after boiling, the score was 50/100, which was good.

Further, no abnormality was observed even when immersed in methyl ethyl ketone (purity of 93% or more) for 25 days or more. 80 for gasoline
There were no abnormalities even after immersion for more than 1 day, or for more than 6 months in the case of crude oil.

[Example 3] First, a reprinted epoxy resin paint was applied as an undercoat around the aluminum acid electrode plate by a conventional method, and on the undercoat surface, a vinylidene chloride resin emulsion with a content of 3% was applied.
, apply a durable epoxy resin paint according to the present invention, which consists of 97% epoxy resin paint. Although it may be sufficient to apply the coating once, the durability will be improved if the coating is repeated several times.

The epoxy resin paint may contain pigments, etc., but if possible, clear paint is preferable.

When used in electrode plates, as the amount of vinylidene chloride resin emulsion added increases, it becomes more resistant to high-temperature electrolytes.For example, when the amount added is 3%, it can withstand temperatures of about 50 degrees Celsius, but it can withstand temperatures of about 70 degrees Celsius. For C, durability is not sufficient unless the amount added is 6 to 8%, and if the amount added exceeds 10%,
The miscibility of the vinylidene chloride resin emulsion with the epoxy resin paint becomes poor, and if the amount added is less than 0.5%, the effect of the vinylidene chloride resin emulsion is not sufficient. It is thought that this has the effect of preventing this and improving the durability of expansion and contraction due to temperature. By adding vinylidene chloride resin emulsion, the expansion and contraction due to temperature of the electrode plate and the expansion and contraction due to temperature of the painted area are the same, maintaining adhesion! This is considered to mean that A-separation will not occur.

Apply one coat of primer and five coats of top coat around the electrode plate as above.
Zinc was smelted using an aluminum acid electrode plate produced by multiple coatings (film thickness: 800#L). The sulfuric acid concentration is 15%, the temperature of the electrolyte is approximately 45 degrees, and the C1 current is 20 KA.
This is the condition. The results showed better results and a longer lifespan than when bonding conventional vinyl chloride sheets.

[Example 4] First, a tar epoxy resin paint (the paint film contains about 25% tar) is applied as an undercoat around an aluminum acid electrode plate.

A durable epoxy resin paint according to the present invention consisting of 3% vinylidene chloride resin nibble and 97% tar epoxy resin paint is applied onto the above-mentioned undercoated surface.

Apply 1 coat of undercoat and 5 coats of topcoat (film thickness eoo JA,)
Zinc was smelted using the aluminum electrode plate manufactured in this manner. Sulfuric acid concentration 15%, electrolyte temperature 45%
The condition is that the C1 current is 20KA. The results showed better results and a longer lifespan than when bonding conventional vinyl chloride sheets.

[Example 5] After degreasing and roughening each of an iron plate, a copper plate, and an aluminum plate, a tar epoxy resin paint (the coating film contains about 10% tar) is applied as an undercoat. The tar epoxy resin paint is a mixture of approximately 1,000 amounts of a commercially available tar epoxy resin paint (the coating film contains about 25% tar) and a commercially available epoxy resin paint. Painting with tar epoxy resin paint is
Before use, add a hardening agent and apply using the usual method.

A durable epoxy resin paint according to the present invention consisting of 3% vinylidene chloride resin emulsion and 97% epoxy resin paint is applied onto the undercoated surface. When used, a hardening agent is added and applied in a conventional manner.

As described above, a test piece was prepared by applying the undercoat once and the topcoat once, and immersed in boiling 12% hydrochloric acid.
After a certain period of time, the properties of the coating film, such as peeling, were examined, the hardness of the film was examined by cutting with a cutter knife, and the adhesion was examined by a board test.

Iron plate: It withstood immersion for 150 minutes, the film was strong, and when tested on the board, the adhesion was 100/100 and was very good.

Copper plate: It withstood immersion for 180 minutes, the hardness of the film was strong, and when a board test was performed, the adhesion was 100/100, and the adhesion was very good. Even when a tar epoxy resin paint (the paint film contains about 25% tar) is used as a base coat, it works well, withstanding 180 minutes of immersion, and the hardness of the film is strong. /100 and the adhesion was also very good.

Aluminum plate: After being immersed for 180 minutes, the hardness of the film was strong and the board surface test was 100/100.
The adhesion was also very good.

[Example 6] A durable epoxy resin paint according to the present invention consisting of 3% vinylidene chloride resin emulsion and 97% epoxy resin paint was used.

When tested under conditions of a caustic soda concentration of 20% and a temperature of 50 degrees C, no abnormalities were observed for 40 days. Also, sulfuric acid concentration 2
When tested under the conditions of 0% and 50 degrees Celsius, some blisters were observed after 40 days. These results were superior to conventional paints.

[Effects of the Invention] Since the durable epoxy resin paint according to the present invention is configured as described above, firstly, it meets the water quality standards (based on the Water Supply Act).
It conforms to Ministry of Health and Welfare Ordinance No. 56 of 1973) and has the effect of being suitable for food use. Second, it has the effect of forming a painted surface that can withstand gasoline, ketones, or crude oil for a long period of time. Thirdly, it has the effect of being able to form a painted surface that can withstand strong acids such as sulfuric acid and hydrochloric acid for a long period of time on base materials such as iron, copper, aluminum, and stainless steel, and can be formed at low cost. .

Fourth, when used as an electrode plate, it has a longer lifespan and better results than when conventional vinyl chloride sheets are bonded together. As described above, the durable epoxy resin paint according to the present invention is a durable paint.

Claims (2)

[Claims] (1) Vinylidene chloride resin emulsion is 0.5% or more
A durable epoxy resin paint comprising 10% and 99.5% to 90% epoxy resin paint. (2) The durable epoxy resin paint according to claim 1, wherein the epoxy resin paint is a tar epoxy resin paint.