JPH07315282A - Antifouling painting method for frp hull and antifouling frp hull - Google Patents

Abstract

PURPOSE:To prevent organism adhesion to an FRP hull without causing any public pollution such as ocean environmental pollution and any complex maintenance. CONSTITUTION:To a bottom of an FRP hull, chlorinated rubber-based paint containing a plasticizer is applied at thikness of 75-125mum as an undercoat. After naturally drying it, silicone resin-based paint is applied at thickness of 100-150mum as main coating. In this way, a surface conditioning agent can be positively orientated to the coating surface for improving antifouling effect on the hull while securing an adhesive characteristic of the silicone resin-based paint, which is provided with an antipollution characteristic and excellent antifouling effect, to the FRP hull, and a ship speed can be remarkably enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of hull coating for preventing adhesion of marine organisms to the bottom of a ship without polluting the sea, and a hull coated with such an antifouling coating.

[0002]

2. Description of the Related Art A large number of various marine plants and animals adhere to the bottom of a ship, especially when it is anchored for a long time. When the adhesion of marine organisms increases, the resistance during sailing increases and the ship speed decreases. Therefore, antifouling coatings that prevent the attachment of marine organisms or kill the attached organisms by applying antifouling paints containing toxic antifouling agents such as organotin compounds and cuprous oxide to the hull have been conventionally used. Has been done.

[0003]

The conventional antifouling paint for preventing the adhesion of marine organisms to the hull contains a toxic substance such as an organotin compound and cuprous oxide, which dissolves in seawater. Especially in closed sea areas such as the inland sea, marine pollution becomes a problem, and there is also a risk of accumulation in the human body due to the food chain. Moreover, even if it is coated with such an antifouling paint, its antifouling effect is not sufficient, and seagrass and barnacles gradually start to adhere, so that, for example, FRP (Fiber Reinfo
rced Prastics ie Fiber Reinforced Plastic) In the case of a hull, it is necessary to clean the hull several times a year to clean the hull to remove attached organisms. Was spent.

The present invention is intended to solve such a problem, and does not cause pollution such as pollution of the marine environment, and does not require complicated maintenance work, and attaches organisms to a hull, especially an FRP hull. The purpose is to be able to prevent.

[0005]

The present invention has heretofore been used mainly for applications in land pipe systems such as seawater introduction passages and cooling water pipes of thermal power plants, and is known to be non-toxic and non-polluting. Focusing on silicone resin-based paints, it solves the problem of adhesion of paints to the surface to be coated when FRP hulls are coated with anti-fouling paints, and also prevents biofouling with silicone resin-based paints. The effect is further enhanced and the ship speed can be remarkably increased.

The antifouling coating method of the FRP hull according to the present invention is such that a bottom coating of the FRP hull bottom is performed using a chlorinated rubber type paint containing a plasticizer, and then a top coating is applied using a silicone resin type paint. It is characterized by performing.

Further, the FRP hull according to the present invention is such that the bottom of the ship is coated with a chlorinated rubber coating containing a plasticizer, and the top coating is coated with a silicone resin coating. It is characterized by having done.

[0008]

[Function] A chlorinated rubber-based paint that forms an undercoat enhances the adhesion of the silicone resin-based paint to the FRP coated surface, and the silicone resin-based paint, which is the main paint, has a physical property of low critical surface. Underwater such as spores of marine plants and larvae of marine animals due to the tension, elasticity, smoothness, etc., and the components mixed as a surface conditioning agent in the resin are gradually oriented on the surface of the silicone resin coating film. It prevents the attachment of living organisms, and even if it attaches or grows, it easily falls off due to rocking or running of the hull in the sea, and acts to keep the hull clean at all times. In addition, when a chlorinated rubber-based paint containing a plasticizer is used for the undercoating, the plasticizer, which is a component of the paint, acts in the silicone resin coating film and positively applies the surface conditioning agent from the lower layer of the coating film to the surface layer. Although the phenomenon of pushing up is generated, the action of pushing up accelerates the orientation of the surface conditioner on the surface of the silicone resin coating film, and as a result, the antifouling effect is further enhanced.

Further, since the surface of the coating film of the silicone resin type coating has a low friction coefficient, the running resistance of the hull is reduced,
Therefore, the ship speed increases remarkably.

[0010]

EXAMPLE As one example, a chlorinated rubber-based paint containing a plasticizer as an undercoat on the bottom of a FRP hull (for example,
Kansai Paint Co., Ltd .: Trade name "Rabamarin", China Paint Co., Ltd .: Trade name "Rubbax AC" etc.) 7
Apply to a thickness of 5-125 μm. Then, after being naturally dried, a silicone resin-based paint (for example, manufactured by China Paint Co., Ltd .: trade name “Bioclean DX”, “Bioclean SP”, etc.) is applied to a thickness of 100 to 150 μ as a main coating.

When the FRP hull is coated with a silicone resin-based paint, various paints such as vinyl chloride resin paint and epoxy resin paint can be used as the paint for the base coating, in addition to the chloride rubber-based paint. is there. However, in the case of vinyl chloride resin paints and epoxy resin paints, since no plasticizer is mixed in, there is no action to push the surface conditioner by the plasticizer to the surface layer side as described above, and when a chlorinated rubber paint is used. The antifouling effect is smaller than that of.

An immersion experiment conducted to verify the antifouling effect of coating with this silicone resin-based paint will be described below.

In this experiment, an FRP plate was coated with various undercoat paints, and a silicone resin paint coated with "Biocline DX" manufactured by China Paint Co., Ltd. was overcoated and immersed in seawater. Then, after the lapse of two months, the stain condition (biological adhesion condition) of the FRP plate surface was visually observed.

Table 1 shows the results of the observations made after two months from the above experiment. In the table, the numerical value of the fouling ratio shows the ratio of the fouled area to the painted area in%. Also,~
Is classified by the undercoat paint and is as follows. Unpainted Main coating with silicone resin-based coating without primer, vinyl butyral resin coating as base coating, silicone resin coating as top coating, vinyl resin coating as top coating, silicone resin coating as top coating, epoxy resin coating as base coating, silicone as top coating Resin-based paint Undercoat is chlorinated rubber paint, topcoat is silicone resin-based paint Undercoat is modified vinyl resin paint (or ketone resin paint)
And the top coat is a silicone resin paint

[0015]

[Table 1]

From the results of the above-mentioned experiments, the antifouling effect of using a chlorinated rubber-based paint as the undercoat is, of course, greater than the antifouling effect of applying only the silicone resin-based paint without the undercoat. It can be seen that the antifouling effect is remarkable even when compared with the cases where the undercoat paint other than the chlorinated rubber paint is used, and. Further, the fouling ratio of 5% in the case of using the chlorinated rubber-based paint is significantly superior to that in the case of the conventional antifouling paint, so that the maintenance work becomes easy.

In addition, as a result of the actual ship test, the hull with the chlorinated rubber-based paint as the undercoat and the silicone resin-based paint as the topcoat was compared with the one using the conventional antifouling paint as a result of the actual ship test. It was found that the speed increased by about 10%.

[0018]

According to the present invention, the adhesion of the silicone resin-based paint to the FRP hull is ensured by performing the undercoating with the chlorinated rubber-based paint, and the low critical surface tension and elasticity of the silicone-resin-based paint are ensured.・ To prevent marine organisms from fouling by preventing physical adhesion of marine organisms to the hull by physical properties such as smoothness and by orienting the surface conditioning agent on the surface of the coating film so that they can easily fall off. In addition, the orientation of the surface conditioner on the surface of the silicone resin coating film can be accelerated by the action of the plasticizer, which is a composition component of the chlorinated rubber-based paint, and the antifouling effect can be further enhanced.

By applying a silicone resin-based paint to the bottom of the ship, the ship speed can be significantly increased.

Further, since the chlorinated rubber-based paint used as the undercoat and the silicone resin-based paint used as the topcoat are both harmless to the human body and the like, the coating work can be made safe, and the marine environment It is possible to prevent pollution.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C09D 5/00 PPF 5/16 PQJ

Claims (2)

[Claims] 1. A method for applying an antifouling coating to the bottom of a FRP hull, which comprises applying a base coating using a chlorinated rubber coating containing a plasticizer and then applying a top coating using a silicone resin coating. An antifouling coating method for an FRP hull, which is characterized in that 2. An antifouling property, characterized in that a bottom coating of a chlorinated rubber-based coating material containing a plasticizer is applied to the bottom of the ship, and a top coating coating of a silicone resin-based coating is applied on the base coating film. FRP hull.