JPS6228195B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a paint with improved rust prevention properties. There are numerous coatings and adhesives that have been conventionally used or proposed. Among them, it is the most widely used water-based paint and is used in various dissolution states. Adhesion has been utilized using various solvents. A common drawback of a wide variety of these conventional coatings and adhesives is that they do not work well enough to distribute uniformly over the required surface and provide rust protection and locking properties. The object of the present invention is to obtain a coating, a locking agent or an adhesive which overcomes these drawbacks. The present invention applies to a variety of conventional coatings, adhesives, rust preventives, or locking agents, together with a predetermined amount of predetermined metal fine particles, an acid, a lactone of the acid, or a salt of the acid or lactone. or an ester of the acid or the lactone, at least one of the above compounds is added and mixed therein. In addition, when the surface or material to be coated is metal, the additive metal added together with the above-mentioned compound is
It is characterized in that it has a less noble ionization tendency than the metal, and can be made into a fine form and used together with the above-mentioned compounds. The present invention is also characterized in that it provides the effect of preventing moisture permeation, particularly oxygen permeation. Next, the present invention will be explained with reference to examples. A solution of fluorinated epoxy dichrysine ether 135 in fluoroalkylbenzene was applied to a cleaned iron surface using an amine catalyst as a hardening agent and solidified to obtain a first substance. In addition, zinc 1
A substance with a diameter of micron is mixed with 10% of the weight of the first substance dissolved before solidification, and at the same time the chemical formula
A second substance was obtained by adding C ₁₇ H ₃₀ O ₇ acid as a 15% solution of methyl alcohol and solidifying it. The C ₁₇ H ₃₀ O ₇ has the following structural formula. (3-Hydroxy-3,4-dicarboxy pentadecanoic acid) This acid has three types of carboxyl groups: primary, secondary, and tertiary, one hydroxyl group, and a long-chain alkyl group, and has an active It has high adsorption properties, good dispersion uniformity, and extremely smooth wettability (spreadability).
As a result, it adheres well to the coated surface and is effective in preventing the permeation of moisture and oxygen by coating the surface. The said derivatives of this acid have similar properties. The acid concentration and oxygen relative absorption ratio (%) curve used in this example was as shown in FIG.
Absorption shows a sudden decrease at 1000ppm. The water permeability of the first substance was 0.35% in a 6-month test, whereas that of the second substance to which 1000 ppm of acid C ₁₇ H ₃₀ O ₇ was added was also tested for the same period. , 0.01%, one-tenth of the former
It was confirmed below that there was little seepage. As another application example, zinc particles with a diameter of 3 microns were mixed with acid C ₁₇ H ₃₀ O ₇ in an amount of 1% by volume, and mixed at a rate of 15% by volume in each resin-based application adhesive. A substance equivalent to the second substance obtained by adding and mixing the mixture and coating it on an iron surface was tested for the occurrence of rust by a salt dew test at 50 degrees Celsius. 1st
As shown in the table, good results were confirmed.

[Table] Using non-noble metals that tend to ionize (usually non-noble metals relative to the metal on the coated surface), usually Zn, Al,
Using Mn, Cr, Sn, and in some cases Ni, etc., these are made into fine particles in order to increase the surface area. For example, approximately 10 to 500 g of particles with a diameter of 10 microns or less are added. It was confirmed that a mixture containing an appropriate amount of acid had a good effect as a coating adhesive. Adhesion is usually 10
Make a ~20 micron thick adhesive. It was confirmed that polyester-based, alkyd-based, acrylate-based, and epoxy-based resins are suitable for use as a coating adhesive. It was also confirmed that monomers reacted with ethylene glycol, ether, monoradical alcohol, etc. can also be obtained. The adhesive thus obtained was tested as a locking agent for screws, a sealant for pipe joints, and a sealant for curled parts of metal containers, and the results showed that it was more effective in locking or sealing than conventional products. It was confirmed that it improved. Next, an application example in which the present invention is applied to a polyolefin paint will be described. 50 parts of polyethylene powder with an average molecular weight of 20,000 to 30,000, 30 parts of xylene, 70 parts of toluene, and 10 parts of trichlene
10 parts of a mixed solvent, add approximately 50 g of fine aluminum particles with a diameter of 5 microns, add 10 parts of polyisobutyrelene, a small amount of a specific gravity adjusting substance, and a small amount of a dispersion aid, and further add the above-mentioned. C ₁₇ H ₃₀ O ₇
Add a 15% solution of methyl alcohol to the acid in an amount of 1% of the volume of the aluminum fine particles, and mix to uniformly disperse the aluminum particles. In this way, it was possible to maintain the chemical resistance and adhesion of polyethylene, improve the rust prevention and locking properties, and increase the impermeability to moisture and oxygen. The softened product had good effects both as a sealant and as a filler. In this way, the metal is added as fine particles to improve the thermal conductivity of the adhesive part, and the C ₁₇ H ₃₀ O ₇ acid has uniform dispersion, adsorption, and wettability. It improves permeability, forms a film that spreads easily with few pinholes, and prevents moisture and oxygen from permeating. Then, metal particles are dispersed in this coating film to create a metal soap to enhance the anti-corrosion effect, and also to act as a local battery, combining with permeating oxygen and oxidizing the metal particles themselves. It prevents rust from forming on the surface of more noble metals, and as a result, it has a remarkable rust prevention effect that is effective in preventing rust. Next, another example of improved rust prevention will be explained. The main agent in this case is a _C17H30O7 acid or _a derivative of this acid, and is used in a total amount _of 10 to 15%. 5-9% of the compound is used as an auxiliary agent, the balance being water. That is, methyl ester of _C17H30O7 acid is used as the base agent _in an amount of 8 to 14% by volume, _{magnesium C17H30O7} acid is used as 1.3 to 1.8%, and _the total amount of _the base agent is 10 to 15%. As the auxiliary agents, 2 to 3% sodium nitrite, 1% benzotriazole, 2 to 5% ethanolamine, and a total of 5 to 9% of the auxiliary agents are used. The remaining 75-85% plus 100 g of metallic zinc with a diameter of 5 microns is the aqueous diffusion product. A rust preventive solution with this composition was applied to iron, aluminum, copper, and solder solder and dried, and a salt dew test (Table 1) was carried out at 50 degrees Celsius as above. No rust was detected. In addition to the esters produced by the dehydration reaction between acids and alcohols, inorganic acid esters produced by the reaction with phosphoric acid, sulfuric acid, etc., and esters produced by the dehydration reaction with other organic acids can also be used. As already mentioned, the present invention can be used as a coating adhesive, a locking agent, or an intermetallic sealant.
The properties of the matrix are improved by adding and mixing at least one type of C ₁₇ H ₃₀ O ₇ fatty acid or its derivatives, and containing fine particles of a metal with a non-noble ionization tendency, equivalent to a diameter of 10 microns or less. According to this, the addition of the acid or its derivative improves its adsorption, dispersibility,
Reduces pinholes in the paint film through wettability, etc.
It can prevent the permeation of moisture, oxygen, etc. and improve its impermeability.According to experiments, water permeability is lower than that of conventional
I was able to lower it by 1/10. In addition, by adding metal fine particles, a metal barrier is created in the coating film to enhance the antirust effect, and due to the local battery action, it combines with invading oxygen and oxidizes, thereby preventing rust on the surface of the coated metal.
It is thought that these results bring about a good rust prevention effect. Also, depending on the sealing and filling properties,
It can also be used as a locking agent for screws, a paint agent for the inner surface of cans, a sealant for curled cans, paints, and adhesives, improving applicability and adhesion, and providing rust prevention effects. The results are extremely remarkable, and the field of application is expected to expand.

[Brief explanation of the drawing]

FIG. 1 shows the relative absorption curve of C ₁₇ H ₃₀ O ₇ acid concentration ppm and oxygen.

Claims (1)

[Claims] 1. Adding a 3-hydroxy-3,4-dicarboxypentadecanoic acid, a lactone of the acid, or a salt of the acid or lactone to the paint.
Alternatively, at least one compound of the ester of the acid or the lactone is added and mixed together with fine powder of a metal whose ionization tendency is not noble with respect to the coated metal. Paint with improved rust resistance.