JPH0345663A - Corrosion-resistant coating material for application to high-temperature object - Google Patents

Abstract

PURPOSE:To provide a coating material which can be uniformly applied to a high-temperature object to impart excellent corrosion resistance thereto by mixing a base resin with a solvent, a pigment component containing a rust- preventive pigment, and an auxiliary containing a paraffinic additive. CONSTITUTION:A pigment component (A) containing a rust-preventive pigment (e.g. iron oxide) is mixed with a base resin (B) (e.g. an alkyd resin), a solvent (C) (e.g. an alcoholic solvent), and an auxiliary (D) containing a paraffinic additive to prepare a corrosion-resistant coating material for application to a high- temperature object. The incorporation of the rust-preventive pigment as pigment component improves the rustproofness of a coating film itself, while the incorporation of the paraffinic additive as an auxiliary can give a uniform coating film even when there is ruggedness on the surface of an object to be coated so that edge covering capability is improved. Therefore, the coating material thus prepared can give high corrosion resistance even when applied to a high- temperature object.

Description

[Detailed description of the invention] <Industrial application field> The present invention has corrosion resistance P for high-temperature coated objects! l! Regarding L charge Cζ.

<Prior Art> For example, when manufacturing a cylinder block for an engine, the block is cast using a sand mold, sand is removed, and then the surface is treated by shot blasting, and then a corrosion-resistant paint is applied.

In such a case, if you try to shorten the production line, the corrosion resistance of the cast product will be reduced to H! It is necessary to apply Z material. In addition, the size, wall thickness, etc. vary depending on the model, and in summer,
Considering winter temperature changes, *The range of coating temperature is 5℃.
It has a wide range of ~180°C.

<Problems to be Solved by the Invention> However, conventional corrosion-resistant paints have a problem in that when the temperature of the object to be coated exceeds 80° C., the corrosion resistance decreases and the commercial value of the object to be coated decreases.

This is based on the fact that when applied to a high-temperature object, especially if the surface is uneven, such as a cast product, almost no coating film is formed near the tops of the projections.

In view of these circumstances, an object of the present invention is to provide a corrosion-resistant paint for high-temperature objects that can provide a highly corrosion-resistant coating even when the temperature of the object is high.

<Means for Solving the Problems> The corrosion-resistant paint for high-temperature coated objects according to the present invention that achieves the above-mentioned object is a corrosion-resistant paint containing an H material, a paste & fat, a solvent, and an auxiliary agent. It is characterized by containing a rust preventive pigment and a paraffin additive as an auxiliary agent.

<Function> Contains a rust preventive pigment such as Fe oxide as a pigment to improve the rust preventive properties of the coating film itself, and also contains a paraffin additive as an auxiliary agent, so that it can be coated even if there are irregularities. Improves edge covering properties by providing a uniform coating film,
It provides high corrosion resistance even when applied to high-temperature objects.

Example of implementation Hereinafter, the present invention will be explained based on examples.

Table 1 shows a comparison between the composition of the high temperature coating material corrosion resistant according to this example and the composition of the corrosion resistant paint currently used.

As shown in this table, the paint of this example contains 1 to 10% of the rust-preventing pigment.
Add 2% by weight (hereinafter referred to as %) to improve the rust resistance of the coating film, and add 0.2 to 0% of paraffin additive as an auxiliary agent.
．． The amount of the ether solvent is increased and the amount of the alcohol solvent is decreased in order to improve the heat flow property by adding 6% of the solvent. Note that the rust-preventive pigment herein refers to iron oxides and the like.

Table 1 By improving the error covering property and heat flow property in this way, even if the temperature of the object to be coated is 5 to 180°C and the surface of the object to be coated is uneven, the 1:f! One film will be obtained.

Corrosion-resistant paints for high-temperature coated objects according to Examples and corrosion-resistant paints according to Comparative Examples were prepared according to the compositions shown in Table 2.
A coating test was conducted on a coated object (casting) that was heated back and forth. In addition, when the viscosity of both was measured, the former was 610
epg.

The latter was 380 cps.

After coating the coatings in Table 2, the coating film was inspected, and it was found that when the coating of this example was used, as shown in FIG.
The thickness of the coating film 11 on the concave portions 10a and convex portions 10b of the object 10 was almost uniform, but when the paint of the comparative example was used, as shown in FIG. Membrane 11
Although the coating film was thick, almost no coating film was formed on the convex portions 10b.

We also conducted a salt spray test in accordance with JISZ 2371.
The rate of occurrence of red rust after 48 hours was measured. This result is the third
Shown in the table.

Table 3 As shown in Table 3, when the comparative example tJ1'44 was used, no corrosion resistance was obtained at all, but when the paint of the pointed example was used, high corrosion resistance was observed (usually The product is passed until 10% red w4 occurs).

<Effects of the Invention> As explained above, the high-temperature coating material corrosion-resistant paint according to the present invention can be applied uniformly even to coating materials at a high temperature of 180°C, and has a corrosion resistance of 14%, compared to current products. This improves corrosion resistance by more than five times, which leads to simplification of the production line and reduction of production costs.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the state of application of a high-temperature coating object corrosion-resistant paint according to an example, and FIG. 2 is an explanatory diagram showing a state of application of a paint according to a comparative example. In the drawing, 10 is an object to be coated, 10a is a recessed part, 10b is a convex part, and 11 is a coating film. Figure 0a

Claims (1)

[Claims] A corrosion-resistant paint containing a pigment, a base resin, a solvent, and an auxiliary agent, which is characterized by containing a rust-preventing pigment as the pigment and a paraffin additive as an auxiliary agent. .