JPS6354315B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a rust-preventing paint composition, and more particularly to a rust-preventing paint composition containing a scaly lead alloy pigment. Conventionally, rust-preventing paint compositions for steel materials have been prepared by mixing a color vehicle such as drying oil, alkyd resin, chlorinated rubber, epoxy resin, or urethane resin with a lead-based or chromate-based rust preventive pigment. Anti-rust paints were commonly used. The anti-corrosion pigments include lead-based pigments such as lead powder, zinc oxide powder, red lead, lead cyanamide, and calcium leadate, and chromate-based pigments such as zinc chromate, strontium chromate, and basic lead chromate. It is used. By the way, although such pigments have excellent rust prevention properties, they are generally granular, so even if such pigments are present in the paint film,
The ability to block moisture and other corrosive substances from entering from outside the coating film was not very promising. On the other hand, scaly iron oxide, aluminum powder, mica, glass flakes, and the like are known as pigments that have excellent barrier properties against moisture and corrosive substances, but these pigments are hardly expected to have antirust properties. Therefore, in order to impart barrier properties and rust-preventing properties to the coating film at the same time, it is conceivable to use pigments having the respective functions in combination. However, in order to achieve sufficient barrier and rust preventive properties by combining a scale pigment and a rust preventive pigment in this way, it is necessary to mix a fairly large amount of both in the paint. In this case, since the pigment volume concentration (PVC) exceeds 50%, the various physical properties of the coating film deteriorate, and the desired rust prevention properties are not obtained. Recently, scaly lead pigments have been developed as pigments that have both barrier properties and rust-inhibiting properties.However, because these pigments are soft, the scaly pigment particles may be deformed or broken during the pigment dispersion process in the vehicle during paint manufacturing. The disadvantage was that it was easy for problems such as the following to occur. In recent years, with the rise in painting costs and the increase in corrosive substances in the atmosphere, there has been a demand for rust-preventing paints that exhibit excellent rust-prevention properties over a longer period of time. The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a rust-preventing paint composition capable of solving the various problems of the prior art and forming a coating film with excellent barrier properties against corrosive substances and rust-preventing properties. That is. That is, the present invention provides: (1) 100 parts by weight of at least one color vehicle selected from drying oils, alkyd resins, phenolic resins, chlorinated rubber resins, and vinyl resins, (2) lead flakes; It consists of an alloy pigment in a proportion of 10 to 900 parts by weight, and the flaky lead alloy pigment
The present invention relates to a rust-preventing paint composition made of a lead alloy containing 0.05 to 5% by weight of any one of the elements Sb. Color vehicles used in the present invention include drying oils,
Select from alkyd resins (including modified alkyd resins such as phenol modified and acrylic modified), phenolic resins (including modified phenolic resins such as alkyd modified and drying oil modified), chlorinated rubber resins, and vinyl resins (including acrylic resins). at least one drying oil or synthetic resin. As these drying oils or synthetic resins, all those commercially available for use in paints can be used without any problem. On the other hand, the flaky lead alloy pigment used in the present invention is made by adding alloyed particles of lead with one of the elements such as Cu, Ni, Sb, etc. together with stearic acid, mineral spirits, etc. in a ball mill etc. to form flaky lead alloy pigments. Preferably, the particle size is 10 to 100μ and the thickness is
It is about 0.5 to 3μ. The scaly lead alloy pigment is layered in parallel to the material within the paint film, increasing the strength of the paint film and at the same time preventing the permeation and penetration of external steam, moisture, and other corrosive substances. It has the effect of inhibiting corrosion and exhibits the excellent rust prevention properties of lead pigments, and can also impart flexibility to the coating film. Furthermore, by alloying lead as in the present invention, it is possible to impart strength to the lead particles, and as a result, it is possible to prevent deformation, breakage, etc. of the scale-like pigment particles during the pigment dispersion process in the color vehicle during paint production. be. In other words, since the pigment is dispersed in the paint while maintaining an almost perfect scale-like form, the lamination effect in the paint film is further improved, and as a result, the rust prevention properties of the paint film are also improved. From this point of view, the addition ratio of alloying components is
It is preferably 0.05% by weight or more, and preferably about 5% by weight or less in order not to impair the rust prevention properties inherent to lead. In the composition of the present invention, the flaky lead alloy pigment is used in an amount of 10 to 900 parts by weight per 100 parts by weight of the vehicle. In the above range, if the amount of the scaly lead alloy pigment is less than 10 parts by weight, the effect of blocking the penetration of corrosive substances such as moisture will be reduced, and the desired rust prevention property will not be obtained, and on the contrary, the scaly lead alloy pigment will be less than 10 parts by weight. If the lead alloy exceeds 900 parts by weight,
Both are unfavorable because the coating film becomes less flexible and brittle. The composition of the present invention may contain commonly used coloring pigments, extender pigments, other rust preventive pigments, suspending agents, dispersants, diluents, plasticizers, dryers,
It is possible to add and mix other scaly pigments such as glass flakes, solvents, etc. The thus obtained coating composition of the present invention is applied onto an object to be coated to a thickness of 20 to 200 μ by a conventional method such as brushing, roller, or spraying, and then dried at room temperature or by heating. The coating film obtained after drying has excellent properties such as strength, corrosion resistance, and weather resistance. In addition, since the coating film obtained from the coating composition of the present invention exhibits particularly excellent rust prevention properties and physical properties of the coating film, it is possible to apply chlorinated rubber coatings, alkyd resin coatings, epoxy resin coatings, etc. on the coating film after drying. Paints, urethane resin paints, acrylic resin paints, and other intermediate and top coat coating systems exhibit extremely high durability. In addition, the coating film obtained from the composition of the present invention exhibits excellent adhesion to these top coats. The details of the present invention will be explained below with reference to Examples and Comparative Examples. In addition, "parts" and "%" are "parts by weight"
and "% by weight". Example 1 Linseed oil 45 parts Flaky lead alloy pigment A 25 Iron oxide 10 Calcium carbonate 10 Zinc white 4 Anti-settling agent 1 Desiccant 2 Mineral turpentine 3 100 The flaky lead alloy A is a lead alloy containing 0.1% Cu. 88.7% non-volatile content made by atomizing into fine particles, adding 2% stearic acid and mineral spirits, and processing into scales using a pole mill.
The paste has a particle size of 10 to 50μ. Example 2 Soybean oil modified medium oil type alkyd resin (oil length 50%, acid value 5) 30 parts scaly lead alloy pigment B 20 iron oxide 10 talc 5 desiccant 3 anti-skinning agent 1 anti-settling agent 1 mineral spirit 30 100 The flaky lead alloy pigment B is a paste with a non-volatile content of 90.6% produced by processing a lead alloy containing 0.1% Ni in the same manner as in Example 1, and has a particle size of 10 to 50μ. Example 3 Soybean oil-modified medium oil type alkyd resin (same as Example 2) 15.0 parts Chlorinated rubber (manufactured by Asahi Denka Kogyo Co., Ltd.) 15.0 Chlorinated paraffin 40% 7.0 Scaly lead alloy pigment C 20.0 Iron oxide 4.5 Desiccant 2.0 Anti-skinning agent 0.5 Anti-settling agent 1.0 Xylol 35.0 100.0 The flaky lead alloy pigment C is a paste with a non-volatile content of 91.6% produced by processing a lead alloy containing 1% Sb in the same manner as in Example 1. The diameter is 10-50μ. Example 4 Chlorinated rubber (same as Example 3) 25 parts Chlorinated paraffin 40% 10 Scaly lead alloy pigment A 30 Iron oxide 4 Anti-settling agent 1 Xylol 30 100 Example 5 Acrylic resin (Dainippon Ink & Chemicals Co., Ltd.) ), product name Acrydik A-169, non-volatile content 50%)
30 parts scaly lead alloy pigment B 30 iron oxide 4 anti-settling agent 1 xylol 35 100 Example 6 Vinyl chloride resin (manufactured by Union Carbide, trade name: VYHH) 20 parts dibutyl phthalate (DBP) 9 scaly lead alloy pigment C 10 Iron oxide 5 Anti-settling agent 1 Methyl isobutyl ketone 25 Xylol 20 Butyl acetate 10 100 Example 7 Phenol resin (trade name: Hytanol 1131, manufactured by Hitachi Chemical Co., Ltd.) 20 parts Soybean oil modified medium oil alkyd resin (Example 2 and Same) 15 Toluene 16 Ethyl acetate 15 Scaly lead alloy pigment A 30 Iron oxide 4 100 Comparative example 1 Linseed oil 45 parts Lead powder (spherical with particle size 10-50μ) 25 Iron oxide 10 Calcium carbonate 10 Anti-settling agent 1 Zinc white 4 Desiccant 2 Mineral turpentine 3 100 Comparative example 2 Soybean oil modified medium oil type alkyd resin (same as Example 2) 30 parts lead powder (same as Comparative example 1) 20 Iron oxide 5 Mica 10 Desiccant 5 Anti-skinning agent 1 Anti-settling agent 1 Mineral spirits 28 100 Comparative example 3 Soybean oil modified medium oil alkyd resin (same as Example 2) 25 parts lead powder (same as Comparative example 1) 30 Iron oxide 5 Natural MIO (scaly iron oxide) 10 Desiccant 5 Anti-skinning agent 1 Anti-settling agent 1 Mineral spirits 23 100 Comparative example 4 Soybean oil modified medium oil type alkyd resin (same as Example 2) 15.0 parts Chlorinated rubber (same as Example 3) 15.0 Chlorinated paraffin 40 % 7.0 Lead powder (same as Comparative Example 1) 15.0 Iron oxide 4.5 Aluminum powder 10.0 Desiccant 2.0 Anti-skinning agent 0.5 Anti-settling agent 1.0 Xylol 30.0 100.0 As the aluminum powder, Alpaste 1100N (trade name, manufactured by Toyo Aluminum Co., Ltd.) Paste: solid content 64
%, mineral turpentine dispersion) was used. Comparative Example 5 Soybean oil modified medium oil alkyd resin (same as Example 2) 15.0 parts Chlorinated rubber (same as Example 3) 15.0 Chlorinated paraffin 40% 7.0 Lead powder (same as Comparative Example 1) 20.0 Iron oxide 5.0 Natural MIO 10.0 Desiccant 2.0 Anti-skinning agent 0.5 Anti-settling agent 1.0 Xylol 24.5 100.0 Comparative example 6 Chlorinated rubber (same as Example 3) 25 parts chlorinated paraffin 40% 10 Lead powder (same as Comparative example 1) 15 Iron oxide 5 Mica 15 Anti-settling agent 1 Xylol 29 100 Comparative example 7 Chlorinated rubber (same as Example 3) 25 parts chlorinated paraffin 40% 10 Lead powder (same as Comparative example 1) 25 Iron oxide 5 Aluminum powder (same as Comparative example 4) 10 Xylol 25 100 Comparative Example 8 Acrylic resin (same as Example 5) 30 parts lead powder (same as Comparative Example 1) 15 Iron oxide 5 Glass flakes 10 Anti-settling agent 1 Xylol 39 100 As the glass flakes, Nippon Glass Fiber ( KK)
Product name CF-150 (particle size 0.03 to 6 mm) was used. Comparative Example 9 Acrylic resin (same as Example 5) 30 parts natural MIO 10 Lead powder (same as Comparative Example 1) 20 Iron oxide 5 Anti-settling agent 1 Xylol 34 100 Comparative Example 10 Vinyl chloride resin (same as Example 6) 20 parts dibutyl phthalate (DBP) 9 Lead powder (same as Comparative Example 1) 10 Iron oxide 5 Mica 10 Anti-settling agent 1 Methyl isobutyl ketone 20 Xylol 15 Butyl acetate 10 100 Comparative example 11 Vinyl chloride resin (same as Example 6) 20 parts DBP 9 Natural MIO 10 Lead powder (same as Comparative Example 1) 20 Iron oxide 5 Anti-settling agent 1 Methyl isobutyl ketone 15 Xylol 10 Butyl acetate 10 100 The coating compositions shown in the above examples and comparative examples are The inhibitor, extender pigment, and coloring pigment were previously dispersed in a color vehicle by a conventional method, and then the scaly lead alloy pigment or lead powder was added and stirred with a disper to produce the product. Each of the obtained paint compositions was coated on a polished mild steel plate that had been polished with sandpaper and degreased with trichloride to give a dry film thickness.
It was coated to a thickness of 70μ (35μ x 2 times), and after drying it was subjected to a comparative test. The test results are shown in Table-1 and Table-2.

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[Table] From the comparative test results Table 1 and Table 2, it is clear that the coating film obtained from the coating composition of the present invention is superior to the coating film obtained from the conventionally known coating composition or the comparative coating composition. In comparison, the corrosion resistance was further improved and the physical properties of the coating film were also excellent.

Claims (1)

[Scope of Claims] 1. For 100 parts by weight of at least one color vehicle selected from drying oil, alkyd resin, phenolic resin, chlorinated rubber resin, and vinyl resin, 2. 10 to 10 parts of scaly lead alloy pigment. 900 parts by weight, and the flaky lead alloy pigment contains Cu, Ni or Sb.
An anticorrosive paint composition made of a lead alloy containing 0.05 to 5% by weight of any of the following elements.