JPS59122559A - Heavy-duty corrosion-protection ceramic paint - Google Patents

Abstract

PURPOSE:To provide the titled paint exhibiting high adhesivity by simple substrate treatment, having excellent compatibility with pigment and suitable for the coating of metal, by compounding a ceramic component, a polymerized linseed oil, a urethanized modified linseed oil and styrene-butadiene rubber, etc. at specific ratios. CONSTITUTION:The objective paint is prepared by compounding (A) 25-55wt% of a ceramic component composed of (i) 30-50pts.wt. of silicon carbide, (ii) 10-30pts.wt. of stabilized zirconium oxide, (iii) 20-40pts.wt. of aluminum oxide, (iv) 5-20pts.wt. of silicon nitride, (v) 5-20pts.wt. of flaky glass, (iv) 5-20pts.wt. of flaky iron powder, and (vii) 5-20pts.wt. of flaky aluminum hydroxide, with (B) 10-50wt% of polymerized linseed oil, (C) 10-25wt% of urethanized modified linseed oil and (D) 5-20wt% of a styrene-butadiene rubber or chlorinated rubber. EFFECT:Excellent corrosion protection, heat resistance and abrasion resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heavy-duty anti-corrosion paint entirely containing a corrosion-resistant ceramic composition.

BACKGROUND ART Anticorrosion paints that coat metal surfaces have been known for the purpose of preventing corrosion and rust. Furthermore, it is a well-known fact that epoxy-based paints or unsaturated polyester-based paints are effective in using scaly glass flakes or iron oxide as anticorrosion additives in the paint. The performance (durability) of conventional anticorrosive paints deteriorated due to pinholes in the formed coating film and penetration of corrosive components from the coating surface.

In addition, the effects of epoxy paints containing mica-like (scale-like) glass flakes and iron oxide powder, and unsaturated polyester paints depend on the surface condition of the base treatment during painting of the substrate to be coated. In particular, the adhesion to rusted surfaces is poor, and the surface preparation process required for this requires perfection, which is a key factor in Kyoto.

Originally, the general concept of the anticorrosion mechanism of anticorrosive paints focused on the coating film effect of oils and resins that are part of the binder, but in order to improve the performance of paints, it is necessary to It is also important to consider and research the extender pigment content.

Therefore, the object of the present invention is to maintain strong adhesion and to contain pigments with good overall compatibility with a simple surface treatment, relatively unaffected by the surface condition of the object to be coated, and to The object of the present invention is to find a heavy-duty anticorrosive ceramic paint that has improved anticorrosion performance, heat resistance, and abrasion resistance compared to other products.

This problem was solved based on the research results a) 25-55% by weight of silicon carbide (Sin 50-50 parts by weight, stabilized zirconium oxide (ZrO) 10-50 parts by weight, aluminum oxide (Al, 03) 20-40 parts by weight) Department,
Silicon nitride (SiaNt) 5 to 20 parts by weight,
Mica-like glass flakes 5-20 parts by weight, mica-like iron powder 5-20 parts by weight, and mica-like aluminum hydroxide (Al(OR)s) 5-20 parts by weight.
Ceramic component consisting of 20 parts by weight (however, the total of each compound is always 100 parts by weight, b) 10-50% by weight of polymerized linseed oil, c) 10-50% by weight
25% by weight of urethanized modified linseed oil and d) 5-20. * Solved by a heavy anti-corrosion ceramic paint characterized by containing % of styrene-butadiene rubber or chlorinated rubber fc.

The total amount of each compound in the entire composition of the ceramic component as a corrosion resistance imparting material is the sum of all components (a+b+c+a)V
On the other hand, it can be varied within the range of 25 to 55% by weight depending on the application. The various additives constituting the ceramic component and their advantageous amounts used are as described above. The critical significance regarding the amount of each compound to be used is detailed below.

If the amount of silicon carbide is less than 5'0 parts by weight or if the amount of stabilized zirconium oxide is less than 10 parts by weight, the heat resistance, acid resistance, and alkali resistance of the coating film will decrease, causing deterioration of the coating film.

When the amount of aluminum oxide is less than 20 parts, the hardness of the coating film decreases significantly and the wear resistance decreases.

5 parts by weight of silicon nitride, mica-like (scaly or mica-like)
If the amount does not reach 5 parts by weight of glass flakes, 5 parts by weight of mica-like iron powder, or 5 parts by weight of mica-like aluminum hydroxide, these are effective in preventing the penetration of corrosive components in the coating film. A layered parallel arrangement of materials cannot be achieved at all.

The polymerized linseed oil as film former b) is advantageously in the range from 10 to 50% by weight.

If this is less than 10% by weight, the coating thickness becomes too thin to incorporate the above-mentioned amount of ceramic component into the gold coating. If the amount exceeds 50 μm, the amount of oil and fat layer will be too large, making it impossible to obtain a sufficient coating film hardness, and as a result, only a coating film will be obtained that has poor abrasion resistance and is prone to cracking.

Urethane-modified linseed oil c) is commonly used in the paint industry and is advantageously used in a range of 10 to 25% by weight. When it is less than 10% by weight, the adhesion to the rusted surface of the object to be coated decreases. It is possible to exceed 25% by weight, but for economical reasons and 25% by weight.
It is meaningless because there is no additional heating effect based on the use of more than % by weight.

Component d) styrene-butadiene rubber (SBR) or chlorinated rubber as binder is common in the paint industry and its usage should not exceed 20% by weight. If the amount exceeds 20 μm, the surface of the coating film will have a sludge-like property, and the coating film hardness will be insufficient for practical use. 5
If it is less than % by weight, the inherent properties of the binder will deteriorate and the coating film will likely deteriorate.

The heavy corrosion-resistant ceramic paint of the present invention may contain a diluent, a drying accelerator, a pigment, and other additives.

Pigments include common antirust pigments and/or moisture-resistant pigments, such as aluminum hydroxide, calcium carbonate, and the like. Aromatic hydrocarbons such as mineral turpentine, mineral spirits, etc. are suitable as diluting solvents. Such a solvent not only dilutes the paint but also dissolves component d). From the viewpoint of the viscosity and fluidity of the paint, the amount thereof is advantageously 5 to 20% by weight based on the total paint. As the drying accelerator, inorganic desiccants used in the paint field are advantageous, and lead naphthenate, cobalt nanthenate, or a mixture of both are particularly preferred. Among these, it is appropriate to use a combination of lead naphthenate, which is effective for drying the inside of the coating, and cobalt nanthenate, which is effective for drying the outer surface of the coating. The amount of desiccant used is
It is effective if it is 0.5% by weight or more of the entire paint, but 1
Since there is no change in the catalytic effect even if the concentration exceeds 0% by weight, 1
A usage amount of 0% by weight or more is meaningless.

Next, the present invention will be explained in more detail using the following examples and comparative examples.

``Lh'' Mix all of the following ingredients and homogenize: Polymerized linseed oil
10 parts by weight Urethane modified linseed oil
20 y (linseed oil modified with 60% by weight of urethane) styrene-butadiene rubber 8 Silicon carbide 19 # Stabilized zircon oxide
5.

Aluminum oxide 16 tt Silicon nitride 5.

Crow flakes 4 Mica-like iron powder
2 Mineral turpentine
10,5 P desiccant (1=1 mixture with lead tocobalt nanthenate) Q,5 Mica-like aluminum hydroxide 5 Apply the obtained paint onto the rusted surface of the steel plate using a brush, applying approximately 0. Coating is applied to a thickness δ of 4% (400 microns). After curing and drying at 25°C for 7 days, the salt water resistance, acid resistance, alkali resistance, accelerating weather resistance, and corrosive gas permeability were compared with commercially available general anticorrosion paints.

The results are shown in Table 1.

Polymerized linseed oil 12M parts Urethane-modified linseed oil 17〃 (5OJLft% with urethane)
Modified linseed oil) Chlorinated rubber 7
II Silicon carbide 16 Stabilized zircon oxide 10 Aluminum oxide
6 〃Silicon nitride 2 〃
Glass flakes 7 Mica-like iron powder
7 Mica-like aluminum hydroxide
5 Mineral turpentine 10.5
tt desiccant (same as Example 1) [L5 t
Table 1 shows the results of repeating the method of Example 1 using the above composition.

Example 6 Polymerized linseed oil 50 parts by weight Urethane-modified linseed oil 11 (linseed oil modified with urethane at 50% by weight) Styrene-butadiene rubber
8 Silicon carbide 10 Stabilized zircon oxide 5 Aluminum oxide
7 Sodium nitride 7
〃Glass flakes 2 〃Mica-like iron powder 4 〃Mica-like aluminum hydroxide
5 Mineral turpentine 1 [14
p Desiccant (same as Example 1) 0.6 tt The method of Example 1 was repeated using the composition consisting of the above. The results are shown in Table 1.

Example 4 Polymerized linseed oil 47 parts by weight Urethane-modified linseed oil 10 (linseed oil modified by 50% by weight with urethane) Styrene-butadiene rubber 5 Mt
Part Silicon carbide 8 Stabilized zircon oxide 5 Aluminum oxide
5 〃Silicon nitride 5 〃
Glass flakes 4 Mica-like iron powder
6 Mica-like aluminum hydroxide
5 Mineral turpentine 8 Desiccant (same as Example 1) 1 The method of Example 1 was repeated using the entire composition consisting of the above. The results are shown in Table 1.

Example 5 Polymerized linseed oil 40 parts by weight Urethane-modified linseed oil 12 (linseed oil modified by 30% by weight with urethane) Styrene butadiene rubber 7
Silicon carbide 10 // Stabilized zircon oxide 5 Aluminum oxide
5 〃Silicon nitride 2 parts by weight glass flakes 5 〃Mica-like iron powder
4 Mica-like aluminum hydroxide
2 Mineral turpentine 11,2
The method of Example 1 was repeated using a composition consisting of tt desiccant (same as Example iVC) 08. The results are shown in Table 1.

Comparative Example The method of Example 1 was carried out using a mixture consisting of 70% by weight of a commercially available asphalt-modified epoxy resin paint (UNIGLOOF A8Q, W, manufactured by Union Giken, K.) and 50% by weight of glass flakes. The repeated results are shown in Table 1.

Claims (1)

[Claims] a) 25-55% by weight of silicon carbide (EIiO) 50-50 parts by weight, stabilized zirconium oxide (ZrO) 10-so LJs, aluminum oxide (A!20B) 20-4031i amount parts, silicon nitride (Si3N4) 5-20 parts by weight, mica-like glass flakes 5-20 parts by weight, mica-like iron powder
5-20 heavy cod and mica-like aluminum hydroxide (M(OH)x) 5-20
A ceramic component consisting of M parts (however, the total of each compound is always [
b) 10-50% by weight of polymerized linseed oil; c) 10-25% by weight of urethanized modified linseed oil; and a) 5-20% by weight of styrene-butadiene rubber or chlorinated rubber. A heavy-duty anti-corrosion ceramic paint that is characterized by the fact that it contains