JPS5811564A - Electrically conductive coating material and stainproof and corrosionproof apparatus - Google Patents

Abstract

PURPOSE:To provide an electrially conductive coating material capable of keeping the stainproofing effect for a long period, harmless to life, and suitable for the coating of marine construction, etc., by mixing an organic or inorganic polymer, electrically conductive fibers, and fine powder of metal flakes to make a paste (or paint) wherein the metal flakes are connected with each other in the form of chain. CONSTITUTION:The objetive coating material is obtained in the form of paste or paint, e.g. by (1) mixing (A) 100pts.wt. of flaky fine powder of copper or a copper alloy having particle size of 80-10,000 mesh with (B) 2-30pts.wt. of electrically conductive fibers, (2) spraying (C) an electrically conductive bonding agent such as an aqueous solution of lithium orthophosphate (preferably containing a slight amount of a surface active agent) to the mixture, and (3) mixing and kneading the product with (D) 400-800pts.wt. of a paint composed of (i) 10-30% coating vehicle and (ii) 90-70% solvent. EFFECT:Bactericidal activity. USE:Toilet stool, floor and wall of lavatory, operating room, sickroom, and passage of hospital, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductive coating and a method for antifouling and anticorrosion.

-・・ -One layer-II#1-1-^4shi Ka↓Shukyo surname f
A conductive coating that can be used as a conductive pillar material as a surface and can be coated with various constituent materials, and has a great anti-corrosion effect and prevents the adhesion of molds, mushrooms, algae, and shellfish. The object of the present invention is to obtain an antifouling and anticorrosion method using the conductive coating.

Foil-shaped metal fine powder has excellent electrical conductivity as a metal-specific property, but even if it is mixed into cement or paint and applied to a solid surface, the electrical conductivity is never good. This is because an insulating inorganic substance or organic substance (inorganic polymer or organic polymer) is present between the boundaries (boundary gaps) between the foil-like fine metal powder particles.

Recently, attention has been drawn to the fact that metal steel surfaces have bactericidal properties, but coatings with paints containing Cu or Cu alloys have never been treated with sterilizers, cement, or underwater antifouling agents like metal copper. At the time of development, a significant improvement in the underwater antifouling performance was observed after one electrification, and it was revealed that this improvement in antifouling performance was largely related to the conductivity of the coating.

Therefore, in the present invention, a small amount of conductive fibers such as carbon fibers, graphite fibers, and metal fibers are mixed with heavy metal fine powder to form a chain-like aggregate with foil-like metal fine powder attached to the fiber surface. The purpose of the present invention is to propose a coating that can maintain extremely good electrical conductivity even when mixed into an organic polymer.

The conductive coating of the present invention exhibits a sterilizing effect like metal steel when energized, and the type of vehicle, cu.

The sterilization effect can be controlled arbitrarily by changing the amount of electricity and the amount of electricity applied. The electrical conductivity can be arbitrarily controlled by the type of metal, particle size distribution, type of conductive fiber, blending ratio, mixing method, and amount mixed into the polymer of the foil-like fine metal powder. Furthermore, adhesive bonding between the particles of the foil-like fine metal powder and between the conductive fibers can be easily achieved by adding a small amount of a conductive material such as an aqueous lysium phosphate solution.

The metal foil-like fine powder used in the present invention is A u * Ag + Cu pond A1. which has been used since ancient times. Zn
It extends to. The present inventors are concerned with a technology for producing Zn, which has hitherto been thought to be a mud-like powder and cannot be produced into a foil-like powder, into a foil-like, scaly powder by rapidly cooling a Zn melt and pulverizing it in a Gale mill. Furthermore, ductile Au, 8g, Cu+
It is possible to use a foil-like fine metal powder obtained by mixing metals such as AtK Ni, Zn+Sn, etc. to form an alloy, rapidly cooling the melt, and then rolling and crushing the resulting mixture. Carbon fibers, graphite fibers, silicon carbide fibers, and the like are flexible conductive fibers, and a thin conductive coating can be easily formed on any surface. In other words, it is possible to create a conductive covering with a flexible structure. On the other hand, since metal fibers are hard, they are suitable for creating a rigid conductive covering on the surface of a rigid structure such as concrete. The work of constructing the sheathing is faster and easier with flexible conductive sheathing and can be easily carried out on concrete surfaces.

To explain a specific example of the present invention, a small amount of conductive fiber is mixed with a foil-like microfiber of Cu or a Cu-containing alloy of 0 to 10,000 meshes, economically preferably 200 to 500 meshes, and the mixing ratio is foil-like. 2 to 30 parts, preferably 8 to 15 parts, are mixed with 100 parts of fine metal powder, and a conductive bonding agent such as lysium orthophosphate aqueous solution is sprayed (in this case, a small amount of surfactant is added to the conductive bonding agent). (It is effective to improve the wettability of the conductive adhesive between the foil-like metal surface and the conductive fiber surface by blending it into the agent.) Thereafter, the paint vehicle is mixed with the paint vehicle for 10~ Paint 400 consisting of 30% and 90-70% solvent
By mixing and kneading ~800 parts, paste form,
A conductive coating in the form of a paint can be obtained. When using this, metal plate surfaces, concrete surfaces, net shapes, cage shapes, etc.
Apply to the surface of an object of any shape, such as a lobe, and dry. This drying may be done by heating for about 200 parts or by air drying. Then, the resulting conductive coating is supplied with alternating current, direct current, or alternating current mixed with direct current, with a voltage of 10 to 220.
The voltage is preferably 10 to 40 Volt, and the current is 20 to 300 Amps per m2 of surface area. Seawater from iron pipes in seawater introduction channels for factories such as power plants, concrete, bridge gutter, bridge supports, floating bridges, buoys, offshore tanks, various shipboard plants such as wave power plants, offshore structures such as offshore oil extractor rigs, etc. Even if the parts that come into contact with the seams are made with strict anti-corrosion effects, algae and insects will adhere to them, and if they breed, they will peel off in rough seas, and the heavy anti-corrosion agent will be stripped off, making it impossible to achieve the anti-corrosion effect.According to the present invention The conductive coating has an outstanding antifouling effect and can provide long-term antifouling effects, so it is an essential heavy duty antifouling material for marine structures when used in combination with heavy duty antifouling materials. The thing is that it does not contain any substances that are harmful to the survival and life of living things, such as organic tin, organic mercury, organic chlorine, and organic bromine.Metallic copper has been safe since ancient times and has been used as a material for tableware, toiletries, food, and crafts. , is a representative of the safest metal that has been used for a long time as a building material.The product of the present invention is not only a safe material, but also can be easily used for repairs.

Furthermore, the conductive coating of the present invention is used for toilet bowls, floors, and walls, and when used with electricity, exhibits a bactericidal effect against bacteria by ionizing the foil-like Cu or Cu alloy due to atmospheric humidity, etc. Provides a warm and comfortable feeling when energized. Furthermore, the conductive coatings of the present invention can be similarly used on the floors and walls of hospital operating rooms, patient rooms, and hallways to maintain germicidal action and warm, comfortable conditions.

Example 1 100 parts of foil-like metallic copper were mixed with 10 parts of chopped graphite fiber (average fiber length 31 Im, average single fiber diameter 12-5 #FI), 85 parts of ethylene vinyl acetate resin, and LONO 78.
A paint-like mixture obtained by kneading a resin solution consisting of 477 parts of solvent and a thickness of 3%, 30 crn x 50 c WI
Apply two coats of no-ke coating to both sides of the corner iron plate. Its thickness is 0.1%.

Apply anti-corrosion paint to the iron plate in advance to prevent rust and insulate the iron plate. The conductive coating exhibits current conductivity and IOV
Amp was immersed in the sea off the coast of Tokyo Bay, Chiba Prefecture, and an antifouling test was conducted.

The product of the present invention The product of the present invention is applied with conventional antifouling coating and energized.
The painted animal is 6 months old, no change, no change, no change appearance, slightly greenish, 12 month old, and algae on the surface. At the 24th month, the algae and the algae are growing and growing, and at the 6th and 12th month, the number of flaking areas has increased.The appearance is almost the same, but the algae and algae have not turned green. live in
No growth of algae is observed.Example 2: A fishing net is knitted using three-handed thread of 16th count spun yarn, which is a mixture of 8% chopped carbon fiber and 5-denier nylon short fibers. A).

In addition, a fish net was knitted using a spun yarn obtained by mixing and twisting three 20-denier nylon long fibers, graphite fiber sliver yarn, and one Nostran R yarn (this will be referred to as fish net B), and a scallop culture test was conducted.゛The conductive coating applied above is the same as in Example 1. I Amp is energized across one section of the network at a voltage of IOV.

Fish net person Fish net B Fish net B (Electricity is applied) (Electrification is applied) (Electricity cannot be applied)
(Reticular body according to the present invention (Reticular body according to the present invention)) 6 months have passed, 12 months have passed, and in the 3rd month, algae, algae, and mosquitoes have grown on the − surface, and they have adhered to the surface. There are no algae attached.Algae are not attached.Algae are not attached.
The scallops are doing well, and the influx of seawater is causing the growth of the scallops, which relieves the lack of oxygen.
Strain and pull out to keep the scallops healthy.
Growing up with cleaning in mind
Example 3: 1501 i' of stool to 54 i' of water? Add, mix thoroughly,
Filter the p solution through a 20-mesh wire mesh, leave it for one day, and use the clear water from which the sediment has been removed as sample water. This has a pH of 7.4
, chemical oxygen demand (COD) 216 mP/J s biochemical oxygen demand 240 wv/-6, suspended solids (8
8) 10.81n9/J, coliform bacteria is 9 in 1at
X10'. The conductive coating of Example 1 was applied to the surface of 9 tiles totaling 30 c/rn x 30 c/m.
Pass electricity of °V, lAmp. Spray the above fecal water sample water on the surface of this tile 30 times every 10 minutes, and after spraying for 2 hours.
After applying rB current, the surface was washed with clean water, 100 cc of water was collected, and the residual coliform bacteria in it was measured.A conductive coating using this Cu foil metal fine powder was applied.
The sterilizing effect is clear when electricity is applied.

Example 4゜A conductive curtain with 2 to 3 x square mesh woven from a yarn made by blending water-absorbing nylon fibers with 8% graphite fiber (weight ratio) was coated with a foil-like mixture of metallic copper and metallic nickel (weight ratio: 5: 1) Spray 100 parts of the conductive coating according to Example 1 in an amount of 3 weight per 100 weight, and dry. 10V per width 1rn and length 2□ of the conductive curtain (conductive metal copper conductive coated network in a broad sense) thus obtained.
Apply an AC voltage of . The current is 0.5 Amp. When the fecal water of Example 3 was sprinkled on this and the coliform bacteria was measured one hour later, it was completely negative, whereas those to which nothing was applied showed values of 1.0 x 10' to 3 x 105.

Example 5 When knitting a fishing net made of polyester twin threads, graphite fibers (diameter 5.5μ, TensileStren
gth 300kl/was” #Young's
Mgdulus 20,000ky/ma") is a twisted rope (diameter 4%) with one flat turf with pin winding width 2% (6.6ff polyester twin yarn, 0.4P graphite fiber per 1m) A fishing net is knitted by applying the conductive coating of Example 1 to a twisted rope of graphite fibers and drying it with a 1 mm comb.The coating amount is 1.
0? So, when this is energized in seawater in winter, it is 0 at 10V AC.
．． I Amp. Fishing nets were made using ropes woven from twisted graphite fibers, coated with a conductive coating, and immersed in the sea in western Shikoku for experimental cultivation of yellowtail and compared with conventional methods. It was introduced in July, and seaweed',
Observe the adhesion status of mosquito species and the growth status of nomachini.

A B C Introduced to the conventional fishing net according to the present invention Conventional fishing net alone Reticulated body Coated with an electrically conductive coating (energized) The clothed net is pulled up and requires cleaning with algae and chimney.

Claims (1)

[Scope of Claims] 1. A conductive coating characterized in that conductive fibers are mixed into an organic or inorganic polymer so that foil-like fine metal powder is resistant to adhesion and form a chain, forming a paste-like or paint-like structure. body. 2. The conductive coating according to claim 1, characterized in that copper, nickel, zinc, tin, aluminum alone or an appropriate alloy is selected as the foil-like metal fine powder. 3. An antifouling and anticorrosion device characterized in that a conductive coating is prepared by mixing conductive fibers with foil-like metal fine powder and dispersing it in an organic or inorganic polymer, which is coated and solidified on a desired structure and connected to an energizing device. .