JPS636115B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a rust-preventing paint composition with excellent anti-corrosion and rust-preventing properties, and more specifically to an organic binder such as epoxy resin, chlorinated rubber resin, urethane resin, or initial condensation of a silicate ester such as ethyl silicate. The present invention relates to a rust-preventing paint composition characterized by containing as main components an inorganic binder such as alkali silicate such as sodium silicate, potassium silicate, lithium silicate, or ammonium silicate, and zinc alloy powder. There are many types of anti-rust paints that contain various anti-rust pigments, but among them, zinc-rich paints containing zinc powder have excellent anti-corrosion and anti-corrosion properties and are suitable for use as shop primers on ships and iron structures, or as anti-rust undercoats. It is widely used as Zinc-rich paint is a paint that is generally obtained by mixing a large amount of zinc powder with an organic or inorganic binder, and the zinc in the paint film acts as a sacrificial anode through the electrochemical interaction between the zinc and the steel surface. The corrosion products of zinc provide an anti-corrosion effect due to the blocking action of oxygen and moisture. For this purpose, it is generally necessary for zinc-rich paints to contain 50 to 95% by weight of zinc powder in the dry coating. Furthermore, it is well known that highly pure zinc powders used in zinc-rich paints, which do not contain zinc oxide or other metals as impurities, have excellent anti-rust properties. However, this zinc-rich paint had the following drawbacks. It is true that zinc-rich paint has higher rust-preventing power than anti-rust paints made of other ingredients. However, as mentioned above, this rust prevention ability is due to the sacrificial anode action of zinc in the paint film and the formation of corrosion products, so the zinc in the paint film is consumed and the rust prevention ability decreases. Inevitable. Particularly in a high humidity atmosphere or a corrosive environment containing chlorine ions, the corrosion products cannot be dense, so the anticorrosion effect is weak, and the zinc in the coating film is rapidly eluted and consumed. For these reasons, zinc-rich paints have not been able to maintain long-term rust prevention properties. In order to improve the drawbacks of zinc-rich paints, paints have been developed in which various rust-preventing pigments are mixed with other ingredients, but no paints have yet emerged that provide sufficient long-term rust-preventing effects. For this reason, in order to obtain a long-term rust-preventing effect with zinc-rich paint, it was economically unpalatable, but the rust-preventing effect was maintained by painting with a thick film. The object of the present invention is to eliminate the above-mentioned drawbacks of zinc-rich paints and to provide a new rust-preventing paint composition that has excellent long-term rust-preventing properties. This object of the present invention is achieved by a rust-inhibiting paint composition using zinc alloy powder as a paint binder as is generally known. That is, the present invention includes three inventions, the first of which is
The invention is 0.01≦Ni≦5.0, 0.01≦Cu≦3.0, 0.01≦
Si≦2.0, 0.01≦Ti≦1.5, 0.01≦Sb≦1.0, 0.01≦
Ag≦1.0, 0.01≦Cr≦0.5, 0.01≦Be≦0.5, 0.01≦
Ca≦0.1, 0.01≦Co≦0.1, 0.01≦Na≦0.1, 0.01≦
K≦0.1, 0.01≦In≦0.1, 0.01≦Li≦0.05, 0.01≦
A rust-preventing paint composition characterized by using a zinc alloy powder consisting of one or more additive elements of Sr≦0.05, 0.01≦Mg≦10.0 and the balance being Zn. Further, the second invention of the present invention further provides 0.1 to 60% by weight of Al to the zinc alloy powder used in the first invention.
A rust-preventing paint composition characterized by using a zinc alloy powder containing. Furthermore, a third invention of the present invention is comprised of the zinc alloy powder used in the first invention and/or the zinc alloy powder used in the second invention and zinc powder, and the zinc alloy powder is A rust-preventing paint composition characterized by using a mixed powder containing 5% by weight or more. In addition, the zinc alloy powder used in the present invention includes:
Although extremely small amounts of impurities may be included, the content of each of the above additive elements is the value excluding impurities. In the present invention, when using a zinc alloy powder in which the content ratio of each additive element exceeds the upper limit, or a zinc alloy powder in which the content ratio of the additive element is below the lower limit and does not contain other additive elements, the rust prevention effect is improved. Although no improvement is observed in zinc alloy powder containing two or more added elements or coexisting with Al or Mg, the rust prevention ability is improved. Furthermore, if Al or Mg exceeds the upper limit, the zinc alloy powder will be leached out and consumed to a large extent, making it impossible to obtain long-term rust prevention, which is not preferable. The zinc alloy powder used in the present invention is produced by adding a predetermined amount of additional elements to the Zn base metal to adjust the alloy composition, and then using mechanical methods such as drop graining method, atomization method, and pulverization method, dry method or wet reduction method,
It is manufactured by methods such as electrolytic method and substitution method, and the powder shape can be spherical, spindle-shaped, flattened, or irregular without impairing its rust-preventing ability. The particle size of the alloy powder is in the range of 1 to 20 μm, preferably 2 to 10 μm. In addition, the content of zinc alloy powder in the dry coating film is 40 to 95% by weight, preferably 70% by weight.
~93% by weight is suitable. Further, the excellent antirust ability of zinc alloy powder can also be obtained by using it in combination with zinc powder used in antirust paints. In known zinc powder coatings, especially in zinc-rich paints, the anticorrosive power can be improved by replacing a portion of the amount of zinc powder used with zinc alloy powder. In this case, the replacement amount of zinc alloy powder is 5% of the amount of zinc powder used.
% by weight or more is required. In the present invention, other additives such as anti-rust pigments, coloring pigments, extender pigments, anti-settling agents, etc. may be added as necessary. Furthermore, the coating composition of the present invention does not pose any problem in any of the ready-mixed, two-component, and three-component coating forms. The antirust effect of a paint film consists of two functions: one is to block the intrusion of corrosive substances, and the other is to chemically suppress corrosion reactions under the paint film through the action of antirust pigments.These two functions complement each other. It becomes effective when It is no exaggeration to say that the rust-preventing power of a rust-preventing pigment is greatly influenced by its ability to block corrosion products. In general, corrosion products with antirust properties must be dense and insulating materials that do not allow moisture or various ions to pass through. Al and Mg, which are additive elements in zinc alloy powder, suppress the elution of Zn and at the same time form stable and inactive corrosion products at an early stage. Further, other additive elements accelerate corrosion at an early stage, but form stable corrosion products at an early stage. In this way, the coating composition according to the present invention minimizes the dissolution of the zinc alloy powder and eliminates trace amounts of metal ions due to the sacrificial anode action of the zinc alloy powder and the formation of a dense, strong and stable corrosion product. By creating conditions that allow the powder to effectively precipitate on the alloy surface, the consumption rate of the alloy powder can be reduced and the anti-corrosion ability can be maintained for a long period of time. As described above, the feature of the present invention is a rust-preventing paint composition using zinc alloy powder having a uniform composition of the above-mentioned components, and its rust-preventing power is due to the sacrificial anode action of the zinc alloy powder and the early formation of the barrier. It is imparted by corrosion products with excellent strength. The effects obtained by the present invention are not only improved rust prevention, but also less occurrence of white rust and excellent suitability for topcoating. Next, the present invention will be explained in detail based on Examples and Comparative Examples, but these Examples show examples of the present invention, and the present invention is not limited thereto. In particular, the composition of the zinc alloy powder may be within the range described above even in cases other than those in the examples. The same applies to the type of binder used and the mixing ratio of the binder and the alloy powder. In addition, all numbers in the examples are weight %. Examples 1 to 6 and Comparative Examples 1 to 2 Antirust paint compositions having the formulations shown in Tables 1 to 8 were prepared,
The coating performance was evaluated. The results are shown in Table 9. The test conditions were to use a shot blast plate as a test piece, with a film thickness of 30μm±3, and the evaluation method was very good (◎), good (〇), slightly poor (△),
Evaluation was made on a four-point scale of bad (x). As for the coating system, a top coat of chlorinated rubber paint of 50 μm±5 was applied.

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[Table] As shown in Table 9 above, it is clear that the antirust coating composition according to the present invention has excellent not only antirust properties but also white rust properties and overcoating properties. still,
The rust preventive paint composition according to the present invention has excellent performance as a rust preventive paint for various surface-treated steel plates, in addition to being used as a rust preventive paint for shop primers and undercoats.

Claims (1)

[Claims] 1 0.01≦Ni≦5.0, 0.01≦Cu≦3.0, 0.01≦Si≦
2.0, 0.01≦Ti≦1.5, 0.01≦Sb≦1.0, 0.01≦Ag≦
1.0, 0.01≦Cr≦0.5, 0.01≦Be≦0.5, 0.01≦Ca≦
0.1, 0.01≦Co≦0.1, 0.01≦Na≦0.1, 0.01≦K≦
0.1, 0.01≦In≦0.1, 0.01≦Li≦0.05, 0.01≦Sr≦
A rust-preventing paint composition characterized by using a zinc alloy powder consisting of one or more additive elements of 0.05, 0.01≦Mg≦10.0 and the balance being Zn. 2 0.01≦Ni≦5.0, 0.01≦Cu≦3.0, 0.01≦Si≦
2.0, 0.01≦Ti≦1.5, 0.01≦Sb≦1.0, 0.01≦Ag≦
1.0, 0.01≦Cr≦0.5, 0.01≦Be≦0.5, 0.01≦Ca≦
0.1, 0.01≦Co≦0.1, 0.01≦Na≦0.1, 0.01≦K≦
0.1, 0.01≦In≦0.1, 0.01≦Li≦0.05, 0.01≦Sr≦
A rust-preventing paint composition characterized by using a zinc alloy powder consisting of one or more additive elements of 0.05, 0.01≦Mg≦10.0 each in weight percent, 0.1 to 60 weight percent Al, and the balance Zn. . 3 (a) 0.01≦Ni≦5.0, 0.01≦Cu≦3.0, 0.01≦
Si≦2.0, 0.01≦Ti≦1.5, 0.01≦Sb≦1.0, 0.01
≦Ag≦1.0, 0.01≦Cr≦0.5, 0.01≦Be≦0.5,
0.01≦Ca≦0.1, 0.01≦Co≦0.1, 0.01≦Na≦
0.1, 0.01≦K≦0.1, 0.01≦In≦0.1, 0.01≦Li≦
Zinc alloy powder consisting of one or more additive elements of 0.05, 0.01≦Sr≦0.05, 0.01≦Mg≦10.0 each weight% and the balance being Zn, and/or (b) 0.01≦Ni≦5.0, 0.01 ≦Cu≦3.0, 0.01≦Si≦
2.0, 0.01≦Ti≦1.5, 0.01≦Sb≦1.0, 0.01≦Ag
≦1.0, 0.01≦Cr≦0.5, 0.01≦Be≦0.5, 0.01≦
Ca≦0.1, 0.01≦Co≦0.1, 0.01≦Na≦0.1, 0.01
≦K≦0.1, 0.01≦In≦0.1, 0.01≦Li≦0.05,
0.01≦Sr≦0.05, 0.01≦Mg≦10.0 each weight% 1
Species or two or more additional elements and 0.1 to 60% by weight
(a) zinc alloy powder and/or (b) zinc alloy powder are combined with the above (c) zinc alloy powder; and (c) zinc alloy powder. A rust-preventing paint composition characterized by using a mixed powder containing 5% by weight or more.