JPS61285193A - Smear-resistant painting for outer plank of vessel - Google Patents

Abstract

PURPOSE:To lower paint cost while maintaining smear-resistant effect in vessels of coefficient of rectangular fineness greater than a specific value by applying non-self-polishing type, smear-resistant paint on the flat part of hull bottom having smaller local friction resistance and self-polishing type, smear-resistant paint on the hull sides having greater resistance. CONSTITUTION:In a vessel of coefficient of rectangular fineness of 0.7 or greater, less expensive, non-self-polishing type, smear-resistant paint is applied on the flat part of the hull bottom having smaller local friction resistance and self-polishign type, smear-resistant type paint more expensive but having long- lasting smear-resistant effect is applied on the hull sides having greater local friction resistance. Reasonable smear-resistant painting can be made with reduced cost of smear-resistant paint while maintaining sufficient smear-resistant effect.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for antifouling the outer skin of a ship with a square fertilization coefficient of 0.7 or more, and more specifically, to a method for antifouling the outer skin of a ship with a square fertilization coefficient of 0.7 or more. This invention relates to an effective and economical antifouling construction method for ship shells depending on the resistance.

[Conventional technology]

Sea creatures such as barnacles, oysters, sea squirts, and seaweed adhere to the bottom shell of a ship, such as the flat bottom and sides of the ship. Because of the above problems, an antifouling method of applying an antifouling paint is generally used.

Conventional antifouling construction methods use hydrolyzable antifouling paints using polymers that use triorganotin unsaturated acid esters as vehicles, or polymers containing hydrophilic ether bonds or ester bonds. A self-polishing anti-fouling paint such as non-71111 water-decomposable anti-fouling paint and 141, a non-self-polishing anti-fouling paint whose upper body is a water-insoluble vehicle, were used to coat the bottom plate of the ship. Antifouling work is carried out to coat the entire surface with a uniform coating thickness.

[Problem that the invention seeks to solve]

However, the hydrophilic property due to the increase in carbogylic groups of the resin component caused by the self-polishing property used for this purpose
In addition, in the non-hydrolyzable type, the surface of the coating is dissolved and polished in the resin, forming a flat body that reduces frictional resistance with seawater, resulting in an expensive antifouling installation. There are drawbacks.

On the other hand, non-self-polishing antifouling paints have excellent initial antifouling properties and are inexpensive, allowing for low-cost antifouling construction and being effective when mooring ships. The spongy form of T-soluble resin produced by the elution of suboxide steel is the so-called skeleton! In this case, in the lower part of the skeleton layer, the suboxide steel turns into basic copper carbonate, which is insoluble in seawater, and closes the pores of the skeleton layer, causing the suboxide steel inside the coating film to become In order to prevent elution, the antifouling period tends to be shortened even though the antifouling agent is retained in the coating film, and these phenomena are especially noticeable when the local frictional resistance is large and contact with seawater occurs. These antifouling paints are difficult to use widely in antifouling applications because they are extremely severe in some cases, or the shipping industry, which is currently trying to rationalize its excess number of ships and tonnage, cannot use these antifouling paints. 1! There is a need for the establishment of an effective and rational antifouling construction method that eliminates navigation problems and reduces mooring costs.

[Means to solve the problem]

The inventors of the present invention have conducted various studies to solve this problem, and have conducted research on the frictional resistance that leads to the wear of the coating on the bottom shell, which is said to account for 70% of the total resistance experienced by a sailing ship. As a result, compared to the frictional resistance value in flat water conditions, which is used to estimate propulsion performance in hull design, when subjected to waves such as a sailing ship, the value of each part of the bottom of a ship with a square tolerance coefficient of 0.7 or more is The local frictional resistance values that lead to paint film wear differ greatly, especially on the flat bottom and the ship's sides.In normal water, the local frictional resistance values that lead to paint film wear are relatively equal, but in waves, the value on the ship sides increases significantly. New knowledge was obtained.

The present invention was made based on this knowledge, and aims to reduce operating costs by applying a self-polishing antifouling paint to the sides of the ship, where local frictional resistance is large, and smoothing the coating surface. , Apply non-self-polishing anti-fouling paint to the flat part of the ship's bottom where local frictional resistance is small, because even if you use inexpensive non-self-polishing anti-fouling paint, the skeleton layer will not develop significantly and the anti-fouling effect can be maintained for a long time. We have established an effective and rational antifouling construction method.

That is, the present invention provides antifouling work on the outer skin of a ship with a square hemorrhoid coefficient of 0.7 or more, in which a non-self-polishing antifouling paint is applied to the flat part of the ship's bottom, and a self-polishing antifouling paint is applied to the ship's side parts. This is an antifouling construction method for the outer skin of a ship, which is characterized by applying a coating.

Room 4 - 41 Light 4 Shizukehi In the present invention, a ship with a square ferrule a of 0.7 or more is, for example, a bulk cargo ship loaded with ore, coal, grain, etc., a timber carrier, a chip carrier, a car, a seal carrier, etc. Among special cargo vessels such as transport vessels, cement carriers, refrigerated cargo ships, special tankers such as crude oil tankers, petroleum products and petrochemical product carriers, ferries, and other dual-purpose vessels that carry the above cargoes, square Hifu It is an enlarged ship with a coefficient of 0.7 or more.

In the present invention, the side part of the ship refers to the straight part of the ship's bottom, and the flat part of the ship refers to the bottom shell part surrounded by the zero meter horizontal line or the square station No. 1 (Note 1). ) to Square Station N19 (Note 2) The non-self-polishing antifouling paint used in the present invention contains rosin as a vehicle and a resin compatible with rosin as essential components, The resin that is compatible with rosin is the main resin that is insoluble in seawater.

The rosin used in non-self-polishing antifouling paints has an acid value of 1.
20 or higher and a melting point of 40°C or higher,
These include gum rosin produced from pine tar, wood rosin extracted from pine roots and stumps, and tall oil rosin separated from tall oil, a by-product of craft valves.

If the oxidation of the rosin is less than 120, the solubility of resin acids such as vinylic acid in seawater will be poor, making it difficult to obtain the self-polishing paint of the present invention, and if the melting point is less than 40°C,
It becomes impossible to maintain sufficient physical properties during coating film formation. These rosins may be used alone or in combination,
Modified rosins such as polymerized rosin, hydrogenated rosin, dibasic acid-modified rosin, and rosin derivatives may also be used.

Resins that are compatible with rosin and are used with shredded rosin include acrylic resin, styrene resin, vinyl chloride resin, vinylidene chloride resin, vinyl acetate resin, ethylene vinyl acetate copolymer, urea resin, melamine resin, guanamine resin, Epoxy resin, alkyd resin, polyester resin, styrene-butadiene resin, monide rubber, TS [Normalized polypropylene, phenol resin, urethane resin, polybutadiene, polycyclopentadiene, coumaron/indene resin, xylene resin, petroleum resin, ketone resin , natural rubber, synthetic rubber, etc., and may be modified or blended for the purpose of improving compatibility with rosin.

The self-polishing antifouling paint used in the present invention includes a hydrolyzable type that uses a triorganotin-containing polymer as a vehicle, a non-hydrolyzable type that uses a hydrophilic resin, and an intermediate type that has the properties of both. However, among these, those using tri-organotin-containing polymers are highly applicable because they facilitate the elution phase of the antifouling agent.

The tri-organic-containing polymer used in the vehicle is a polymer of tri-organic tin (meth)acrylate that produces an organotin-containing position represented by the general formula, or a tri-organic tin (meth) acrylate and other copolymerizable polymers therewith. Polymerizable unsaturated compounds such as unsaturated hydrocarbons such as styrene and butadiene, vinyl compounds such as vinyl chloride and methyl vinyl ether,
It is a copolymer with acrylic acid, methacrylic acid or their esters, acrylic compounds such as acrylamide and acrylonitrile, itaconic acid, vinylbenzoic acid, crotonic acid or their esters.

On the other hand, non-hydrolyzable types include dialkylmalate, dialkyl fumarate, alkoxyalkyl (meth)acrylate, acrylamide, methacrylamide, and N-vinylpyrrolidone, which have hydrophilic groups in their polymerizability to provide solubility. , N-vinylsuccinimide, and alkoxycarpoalkyl (meth)acrylate.

An intermediate type having both the properties of a hydrolyzable type and a non-hydrolyzable type is a copolymer of the above-mentioned heavy body imparting hydrophilicity and triorganotin (meth)acrylate.

The self-polishing antifouling paint and non-self-polishing antifouling paint used in the present invention can be used as antifouling agents! Oxidized steel, Thiothia/+4! copper, copper compounds such as naphthi/copper acid, tributyl, fluoride, bistributyl-10- tin oxide, tin compounds such as tributyltin fluoride, 2-methylthio-4-isopropylamino-6-ethylamino to s- triazine, 2-methylthio-4,6
- Triazine compounds such as bisethylamino-S-triazine, and other ingredients such as pigments and thiazole dyes such as titanium white, Bengara, carbon black, cyanine green, cyanine blue, talc, mica, magnesium carbonate, and calcium carbonate. In addition to dyes such as , azo dyes, and carbonium dyes, suspending agents, anti-sagging agents, and repellent/
A degreasing agent, a color separation prevention agent, an ultraviolet absorber, a solvent, etc. can be used.

These antifouling paints use non-self-polishing antifouling paints for the flat part of the ship's bottom, and self-polishing antifouling paints for the other side parts of the ship. It is applied using painting methods such as airless painting, air spray painting, roller painting, and brush painting.

〔Effect of the invention〕

According to the anti-fouling method of the present invention, in a ship having a square thickness coefficient of 07 or more, the side portion of the sailing ship is affected by waves and the frictional force is very large, and in some cases, the side part of the ship may become damaged. However, by using the self-polishing antifouling paint 1, the surface of the paint film becomes smooth, and the roughness of the hull surface, which leads to a reduction in fuel consumption, can be reduced, and the operating cost can be reduced.

On the other hand, in the flat part of the ship's bottom, which accounts for 50% of the ship's bottom area, the frictional force is small and there is almost no wave effect, so even if a non-self-polishing antifouling paint is used, the elution of the antifouling agent will be much different from when the ship is berthed. In addition, since the coating film contains slightly soluble rosin, a skeleton layer does not develop, so it is possible to maintain long-term antifouling ability and suppress an increase in hull surface roughness.

As described above, by using two types of antifouling paints depending on the frictional resistance of the ship's outer panel, it is possible to perform an inexpensive antifouling coating that exhibits sufficient antifouling properties without interfering with ship navigation.

details.

(Frictional resistance measurement test) The first test was conducted in a 59 m circulating water tank with the measurement conditions shown below.
Actual ships A, B, C, D, and g whose specifications are shown in the table.

A model ship F was floated and a water tank test was conducted under the two test conditions of flat water (no waves) and observed waves (waves) shown in Table 2, and the frictional resistance was measured.

Measurement conditions: 12 locations in total (6 locations on the flat part of the ship's bottom); Measuring device: 100cm lateral force meter with strain gauges attached to the four corners of a square aluminum plate, or a pitot tube. .

The tank test results are shown in Table 3.

Table 1: Main characteristics of actual ships and model ships [m] Table 2: Test conditions Table 3: Water tank test results From the results in Table 3, A, B, and C with a square Hifu coefficient of 07 or higher ,D
In the case of 4 ships, the local frictional resistance value of the side part of the ship shows almost the same value as the flat part of the ship's bottom in the case of flat wood, but it gradually increases with the wavelength when regular waves are applied, and in the case of flat water it increases gradually with the wavelength. The value in the X direction is about twice that of the value in the X direction, and the value in the Z direction is more than five times as large.

On the other hand, in the flat part of the ship's bottom, it is only 1.3 times as large in the X direction and approximately twice as large in the Y direction. On the other hand, for the two ships E and F, both of which have square hemorrhoid coefficients of less than 0.7, there is almost no difference between the ship's side and the bottom flat part in both flat water and regular waves, and both values have a square hemorrhoid coefficient of 0. It is higher than ships of 7 or higher, and especially on the flat bottom part, it is about twice as high.

(Example, Comparative Example) Based on the frictional resistance measurement test by this water tank test, actual ship A-
Regarding F, Table 4 and Figure 2 (A.

The 15 locations at the bow, stern, and flat bottom of the ship indicated by the shaded areas in B and C) are the locations for mounting the test plate. Indicates the height from the horizontal line in meters.

(Book 2) C represents the bottom centerline.

(*3) Company a represents the following distance.

Using self-polishing antifouling paints (Paints 1 to 8) and non-self-polishing antifouling paints (Paints 9 to 18) whose formulations are shown in Table 5, an 80 x 80 x 2 m square was sandblasted and then coated with zinc epoxy plastic primer twice. A steel plate of the same size was coated twice with air spray so that the dry m film was 250 μm to 300 μm, and after sufficiently drying, it was immersed in artificial seawater at 20°C for 3 weeks to remove the copper compound, which is an antifouling agent. Measure the rate at which copper elutes from the paint film into seawater (this is considered the initial copper elution rate).
Fitted into a 900+U steel test frame, the test frame was attached to the above-mentioned mounting position, and ships A to D were installed in Examples 1 to 3.
4.G: Ship F was put into service for about two years as Comparative Example 1.2.

Collect the test plate 1. to evaluate the stain resistance (after 7 days, test again at 20℃)
The leached layer of copper was calculated by immersing it in artificial seawater and measuring the rate at which the copper compound, which is an antifouling agent, leaks from the paint film into the seawater [7]. The tests on the bow and stern are for reference only.
The use of a non-self-polishing antifouling paint on the ship's sides and the use of a self-polishing antifouling paint on the bottom flats are comparative examples of paint usage.

The measurement results of copper bathing rate are shown in Tables 6 to 11, and the measurement results of antifouling properties are shown in Tables 12 to 18.

In addition, the evaluation of antifouling properties was expressed in terms of the adhesion area of marine organisms.

Still, the bottom antifouling limit concentration of copper compounds in seawater is generally considered to be 10γ/cII/day.

As is clear from Tables 6 to 17, in Examples 1 to 4, for paints 1 to 8 (self-polishing antifouling paints), the copper elution rate was 10γ/ d/day or more, and there is no adhesion of organisms.

With paints 9 to z8 (non-self-polishing antifouling paints), the copper elution rate on the flat part of the ship's bottom was 10γ/aA/day and there was no adhesion of living organisms, but the copper elution rate on the ship's side was Oγ. /-
7 days and 100 cm of biofouling. Also, since the copper elution rate in the bow and stern areas is 0 γ or 10 γ/cf47 days or less, there is biofouling of 100 (i or less).

In the case of Comparative Examples 1 and 2, in paints 1 to 8, the copper elution rate was 1Oγ/6I/day or more in any part of the outer panel, and no living organisms were attached, but in paints 9 to 18, The elution rate of copper on the flat part of the ship's bottom is less than 0 g or 10 r/i/day, so the biofouling is less than 100 r/i/day. It is biofouling. Also, since the copper elution rate in the bow and stern parts was Or or 10 r/cd/day or more, the amount of organisms attached was 100 cm or less.

As mentioned above, as shown in the aquarium test of a ship with a square fertilization coefficient of 0.70 or more, the antifouling duration of non-self-polishing antifouling paints is shorter in the side, bow, and stern areas where frictional force is large. It was found to be too short to be suitable for use. However, it was found that in the flat part of the ship's bottom where the frictional force is small, even if the antifouling property is not self-polishing, the antifouling period lasts for a long time and is sufficiently suitable for use. On the other hand, it has been found that for ships with a square coefficient of less than 0.70, the frictional force on the flat part of the ship's bottom becomes large, making non-self-polishing antifouling paints unsuitable.

is the starboard side, the first is the port side, and (B) is an explanatory diagram of the bottom of the ship developed in a plan view, and 0 indicates the division line dividing the AP and FPO into 10 equal parts.

In Figures 1 and 2, symbol C represents the center line A and a of the bottom of the ship from the bow to the stern.
is the distance from the center line C, H is zero meters, and the height from the horizontal line is S, S, is the square station AP, is the stern perpendicular FP, is the bow perpendicular, and is the centerline of the ship. represent.

In FIG. 1, the symbol 1.2 indicates the friction force side position of the ship 6, Vlt 3.4, the friction force measurement position layer 5.6 at the stern, and the friction force measurement position 7.8 at the ship's side. .9, 10, 11.12 is the frictional force side orientation of the flat part of the ship's bottom 1jlJi Represents direction.

In Fig. 2, the symbol 1.2.3 indicates the installation of the test plate on the 6th part of the ship at position 1iiA4.
5.6, is the test board on the stern part located flat? , 8.9.
10 indicates the position of the test plate on the side of the ship, and 11.12, 13.14.15 indicates the position of the test plate on the flat part of the ship's bottom.

Patent applicant: NOF Corporation =38-

Claims (3)

[Claims] (1) When performing antifouling work on the outer skin of a ship with a square thickening coefficient of 0.7 or more, apply a non-self-polishing antifouling paint to the flat part of the ship's bottom, and apply a self-polishing antifouling paint to the ship's sides. An antifouling construction method for a ship's outer panel, characterized by: (2) The antifouling construction method for a ship's outer panel according to claim 1, wherein the non-self-polishing antifouling paint contains rosin and a resin compatible with the rosin as essential components. (3) A ship exterior panel according to claim 1 or 2, wherein the self-polishing antifouling paint is a hydrolyzable type, a non-hydrolyzable type, or an intermediate type of self-polishing antifouling paint. Antifouling construction method.