JPS6257471A - Water-soluble rust-preventive paint - Google Patents

Abstract

PURPOSE:To provide the titled paint composed of PVA and a specific amount of cupferron or polyoxyethylene laurylamine and having excellent oil-resistance, heat-resistance and hot-oil resistance. CONSTITUTION:The objective paint is composed of (A) 100pts.(wt.) of PVA and (B) 1-10pts. of cupferron or 1-10pts. of polyoxyethylene laurylamine. It is preferable to incorporate 100pts. of PVA with 25-35pts. of carbon black, 1-3pts. of ultrafine silica anhydride and 10-20pts. of fine particles of hardly water-soluble metal oxide or inorganic salt.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a water-soluble anticorrosive paint. For more details,
It relates to a water-soluble anti-corrosion paint with excellent oil resistance, heat resistance, and heat oil resistance.

[Prior Art] Two types of conventional water-soluble rust preventive paints are generally used: a primary rust preventive agent that does not form a solid film, and a secondary rust preventive agent that forms a solid film.

Low molecular weight organic compounds are often used as primary rust preventive agents, but they easily dissolve in insulating oil at room temperature and have poor oil resistance. Further, polyacrylic polymer compounds are often used as secondary rust preventive agents, but they decompose at around 100° C. and may dissolve in insulating oil, etc., resulting in poor heat resistance.

[Problem to be Solved by the Invention 1] As mentioned above, conventional water-soluble anti-rust paints have poor oil resistance, heat resistance, and hot oil resistance in insulating oil. It is not advisable to cry over something like this.

The present invention has been made to solve the above-mentioned problems, and provides a water-soluble anticorrosive paint with excellent oil resistance, heat resistance, and hot oil resistance. The purpose is to

1 Means for Solving Problem 1 The present invention consists of 100 parts by weight of polyvinyl alcohol, 1 to 10 parts by weight of cuperone represented by the structural formula (■): 1 to 10 parts by weight of polyoxyethylene laurylamine represented by the following formula:

More specifically, it is generally used as a water-soluble adhesive;
Polyvinyl alcohol 100fi ii is used as an adhesive for insulation in oil-filled insulators because it has excellent oil resistance even at temperatures after 20°C, and it quantitatively reacts with metals such as shells and iron. The present invention also relates to a water-soluble anti-rust paint which is a secondary anti-rust paint consisting of 1 to 10 parts by weight of cuperone or polyoxyethylene laurylamine, which is a nonionic compound that does not decompose in hot oil.

[Example] In the present invention, polyvinyl alcohol (hereinafter, PVA
) 100 parts by weight, 1 to 10 parts by weight of cuperone and polyethylene laurylamine (hereinafter referred to as POEL)
1 to 10 parts by weight of the water-soluble anticorrosive paint.

For the above Pv^, Cuperon and POEL^, it is okay to use commercially available ones, and 113100
1 to 10 parts by weight of cuperone or POEL
It is prepared by preparing 1 to 10 parts by weight and dissolving it in ion-exchanged water. Further, the above-mentioned Pv^, cuperone, or POEL^ may be separately dissolved in ion-exchanged water and then blended.

The above-mentioned PVA is a component that makes the rust-preventing effect permanent, and if cuperone or POEL^, which has a rust-preventing effect, is added to it, an excellent rust-preventing effect can be expected. If it is less than 1, the antirust effect will be small, and if it exceeds 10 parts by weight, the strength of the coating will be weakened, so it is preferable to add 1 to 10 parts by weight.

In addition, ion exchange water for dissolving the Pv^ is 1
P if it is less than 300 parts by weight for 13100 parts by weight
VA is difficult to dissolve, and if it exceeds 800 parts by weight, the strength of the coating becomes weak, so it is preferably used in an amount of 300 to 800 parts by weight.

The anticorrosive paint thus obtained is used by applying the coating to a thickness of about 30 μm and allowing it to air dry in the atmosphere at a temperature of 0 to 40°C.

In addition, 25 to 35 parts by weight of carbon black, 1 to 3 parts by weight of ultrafine anhydrous silica, and 10 to 20 parts by weight of slightly water-soluble metal oxide or inorganic salt fine particles, based on 113,100 parts by weight of the water-soluble anticorrosive paint. may be added.

The carbon black is generally used as a black pigment, but if it is added in an amount exceeding 35 parts by weight to 113,100 parts by weight in the water-soluble antirust paint, the adhesion of the coating will deteriorate; If the amount is less than 25 to 35 parts by weight, the coloring effect will be poor, so it is preferable to add 25 to 35 parts by weight.

The ultrafine anhydrous silica particles have a particle size of approximately 0.012μ.
It refers to anhydrous silica in the form of scraps, and is a component for improving the adhesion between the PVA coating film and the underlying metal, but it exceeds 3 parts by weight per 100 parts by weight of P in the water-soluble antirust paint. If the amount is less than 1 part by weight, the adhesion of the coating film will deteriorate, so it is preferable to add 1 to 3 parts by weight.

The metal oxide or inorganic salt is a component for increasing the hardness of the coating film, and examples thereof include barium sulfate and silica sol. If the amount exceeds 10 parts by weight, the adhesion of the coating film will deteriorate, and if it is less than 10 parts by weight, the effect of increasing the hardness of the coating film will be small, so it is preferable to add 10 to 20 parts by weight.

Further, instead of the carbon black, titanium dioxide fine particles used as a white pigment may be directly added to the water-soluble anticorrosive paint.

In this case, fine particles of titanium dioxide refer to particles with a particle size of approximately 10μ, and if it exceeds 35 parts by weight, the adhesion will deteriorate, and if it is less than 25 parts by weight, the coloring effect will be small.
It is preferable to add up to 30 parts by weight.

Furthermore, in order to prevent drying, ethanol or ethanol-based denatured alcohol may be added in an amount of 10 to 20% or more based on the amount of water.

Next, the present invention will be explained in more detail using Examples, but the present invention is not limited to these Examples.

Examples 1 to 6 Cuperone or PO to 100 parts by weight of completely saponified Pv^
ELA was added as shown in Table 1, and the water temperature was 80°C.
500 parts by weight of ion-exchanged water to dissolve the water-soluble anti- I got some paint.

Rust prevention power, viscosity, tackiness, hardness of paint film, and volume resistivity of insulating oil after oil staining test of the obtained water-soluble rust prevention paint,
Table 2 shows the results of measuring the dielectric loss tangent, interfacial tension, and total acid value.

Note that each characteristic was measured according to the following method.

<a> Rust prevention power The water-soluble rust prevention paint obtained above was applied to 150 zX 100
Approximately 30 μl of the paint was applied onto a 5S41 steel plate on the layer shoulder at room temperature, and then air-dried at room temperature for approximately 4 hours. Thereafter, the specimens were exposed to an atmosphere at a temperature of 40° C. and a relative humidity of 95%, and the time required for rust to develop was measured. (
b) Viscosity Measured at room temperature (25°C) using a B-type viscometer manufactured by Tokyo Keiki.

(c) Adhesion (base marks) After making 100 lzz-angle base marks on the paint film with a knife and pasting the tape, the number of TF board marks that did not peel off when the tape was removed. was measured.

(d) Hardness of paint film 7 days after exposure carried out under <8) above! ! ! Changes in the hardness of the I film and the hardness of the coating film during exposure were investigated by tearing a pencil.

<e> Volume resistivity, dielectric loss tangent, interfacial tension, and total acid value of insulating oil after oil staining test.
011
Let dry for an hour. After that, about 20 minutes in insulating oil at 120℃.
Heated for 0 hours.

Next, the volume resistivity, dielectric loss tangent, interfacial tension, and total acid value of the insulating oil at a temperature of 80° C. were measured according to the method of JIS C-2101.

Examples 7 to 16 The water-soluble antirust paints obtained in Examples 2 and 5 had particle size of 0.
．． Ultrafine anhydrous silica (manufactured by Nippon Aeronol Co., Ltd., Aerosil 200) with a shoulder size of 0.012 μm was added to 100 parts by weight of Pv^ as shown in Table 1, and stirred thoroughly to form a new water-soluble rust preventive. I got some paint.

Each characteristic of the obtained water-soluble anticorrosion paint was measured according to the method described in Examples 1 to G. The measurement result is tA2
Shown in the table.

Examples 17 to 24 Silicic anhydride with a particle size of about 10 μm and carbon black or titanium oxide as a pigment were added to the water-soluble antirust paints obtained in Examples 7 and 12 as shown in Table 1, and the paints were well coated. A water-soluble anti-corrosion paint was obtained by stirring.

Each characteristic of the obtained water-soluble anticorrosive paint was measured according to the methods described in Examples 1-3. The results are shown in Table 2.

Examples 25 and 26 Water-soluble anti-corrosion paints were obtained in the same manner as in Example 19, except that Echinen F-1 (Nippon Alcohol Sales Co., Ltd. 91) was added as water and denatured alcohol as shown in Table 1. . Next, the properties of the water-soluble anticorrosion paint obtained were measured according to the methods described in Examples 1 to 3. The results are shown in Table 2.

Examples 2 and 128 A water-soluble anticorrosive paint was obtained in the same manner as in Example 23, except that water and Equinene F-1 as a denatured alcohol were added as shown in Table 1. Each of the obtained water-soluble antirust paints was measured according to the method described in Examples 1 to 3. The results are shown in the second display Comparative Examples 1 to 5 Each characteristic was measured according to the method described in Examples 1 to 3 using the commercially available rust preventive paints shown in Table 3 as conventional water-soluble rust preventive paints. The measured results are shown in Table 5.

Comparative Examples 6 to 8 As Comparative Example 6, 50 parts by weight of ion-exchanged water was added to 100 parts by weight of Pv^.
In addition to the water-soluble antirust paint obtained by adding 0 parts by weight,
As shown in the table, water-soluble rust preventive paints of Comparative Examples 7 and 8 were prepared by adding tannins that react with iron and commercially available rust preventive paints, and the respective properties were described in Examples 1 to 3. Measured according to the method.

The measured results are shown in Table 5.

Table 3 Note) Comparative Example 1 Primary Rust Inhibitor, Comparative Examples 2 to 5 : Secondary rust preventive agent Table 4 [Effect of the invention 1 As stated above, the water-soluble rust preventive paint of the present invention is an inexpensive P
It is composed of VA and either cuperon or POELA, and has excellent oil resistance, heat resistance, and heat oil resistance.
This has the effect that it can be used without deteriorating the various properties of insulating oil used in various oil-filled electrical devices that require a high degree of insulation performance.

Claims (3)

[Claims] (1) A water-soluble rust-preventing paint comprising 100 parts by weight of polyvinyl alcohol and either 1 to 10 parts by weight of Cuperone or 1 to 10 parts by weight of polyoxyethylene laurylamine. (2) 25 to 35 parts by weight of carbon black, 1 to 3 parts by weight of ultrafine anhydrous silica, and 10 to 20 parts by weight of slightly water-soluble metal oxide or inorganic salt fine particles are added to 100 parts by weight of the polyvinyl alcohol. A water-soluble anticorrosive paint according to claim (1), characterized in that: (3) 25 to 35 parts by weight of fine particles of titanium dioxide, 1 to 3 parts by weight of ultrafine anhydrous silica, and 10 to 20 parts by weight of fine particles of poorly water-soluble metal oxides or inorganic salts based on 100 parts by weight of the polyvinyl alcohol. The water-soluble rust-preventing paint according to claim (1), characterized in that it contains: