JPS61118429A - Agent for preventing adhesion of marine life - Google Patents

Abstract

PURPOSE:To prevent the adhesion of marine life to a ship, etc., by applying a sheet or film having a specific contact angle to water and composed of a mixture of a moldable material and a substance having low critical surface tension, to the surface contacting with seawater. CONSTITUTION:A sheet or film having a contact angle to water of >=98 deg. is produced by forming a mixture of a moldable material (e.g. polyethylene, polypropylene, etc.) and a substance incompatible with said material and capable of lowering the critical surface tension of the material (e.g. silicone oil such as polydimethylsiloxane, liquid paraffin, etc.). The sheet or film is applied to the part to prevent the adhesion of marine life.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a marine organism adhesion prevention agent applied to seawater contact surfaces of ships, marine structures, etc. for the purpose of preventing marine organisms from adhering to the seawater contact surfaces. It is related to.

<Conventional technology> Conventionally, in ships, marine structures, equipment that uses seawater, and industries that use seawater that come into contact with seawater, Fujibushi, liverworts, Serpura, sea squirts, etc. adhere to surfaces that come in contact with seawater. In order to grow, these functions are often impaired and suffer serious damage.

For this reason, much research has been conducted on preventing the attachment growth of seawater organisms.

One way to prevent the adhesion of seawater organisms is to apply paint mixed with toxic substances such as tin compounds or copper compounds to areas where adhesion is prevented, and use the action of the toxic substances that gradually dissolve in the sea to prevent adhesion. Are known. However, this method has the problem of not being able to avoid marine pollution caused by toxic substances. From this point of view, a non-toxic marine biofouling prevention agent is desired.

As a non-toxic antifouling paint, a method using oligomer room temperature curing silicone rubber alone or silicone rubber and a low critical surface tension substance is known.

<Problems to be solved by the invention> However, these are all paints and have the disadvantage that they require multiple layers to be applied to the structure to be painted, and that it takes a long time to form a film. .

In addition, there is a method of forming a release treatment layer on the surface of the formed product, but since no low critical surface scratching substance is added, the critical surface tension of the coating film increases in a short time and the antifouling effect decreases. There is a drawback that it does.

Means for Solving the Problems> The present inventors have arrived at the present invention as a result of intensive studies aimed at solving the problems of conventional marine organism adhesion prevention agents as described above.

That is, the present invention provides a sheet or film-like material made of a mixture of a moldable material and a substance that is essentially incompatible with the material and lowers the critical surface tension as an antifouling agent for preventing the adhesion of marine organisms. Therefore, it is an essential requirement that the contact angle of water on the surface is 98 degrees or more, and by attaching such a sheet or film-like molded product to the surface that comes into contact with seawater, it is essentially possible to eliminate the contact angle of seawater organisms. The purpose is to obtain the effect of preventing adhesion.

Function> The moldable materials used in this invention include synthetic resins such as polyethylene, polypropylene, polyvinyl chloride, chlorosulfonated polyethylene, and saturated polyester, natural rubber, butyl rubber, STS', and 5BS1 ethylene-propylene resin. Examples include polymer (EPT) and silicone rubber.

Substances that reduce critical surface tension include silicone oil such as polydimethylsiloxane, liquid paraffin,
Examples include petrolactam, petrolatum, and low-molecular-weight polytetrafluoroethylene.

This invention involves forming a mixture of the above-mentioned moldable material and a substance having a low critical surface tension into a sheet or film.
It is something that takes shape.

It is important that the substance with low critical surface tension gradually bleed onto the surface of the sheet or film, lowering the critical surface tension of the sheet or film and increasing the contact angle of water to 98 degrees or more, preferably 100 degrees or more. be. Therefore, even if a substance having a low critical surface tension is mixed, if the contact angle of water is 98 degrees or less, it will not be effective in preventing the adhesion of marine organisms.

The molded product used in this invention preferably has a shape such as a film, sheet, tape, tube, or irregularly molded product that satisfies each of the above conditions. In order to attach the material to the material, it is preferable to use a material having an adhesion function such as a known adhesive liquid such as an epoxy resin, a thermosetting or chemically reactive adhesive film, or to join the seam.

The tube or profiled article can also be a naturally or heat-shrinkable or expandable article and can be attached to the inner or outer surface with or without an adhesive material.

However, the molded article may be attached by a method other than the above-mentioned two methods.

Example of implementation The present invention will be explained in detail below with reference to Examples.

A sheet-shaped marine organism adhesion prevention agent was made from a mixture of the molding material shown in Table 1 below and a low-criticality surface scratching material, and this was attached to both sides of a 300mm x 100M x 3mm steel plate and left in the sea for 3 months and 1 year. The state of adhesion of marine organisms and the contact angle of water on the surface of each inhibitor were measured after immersion in water.

The results are shown in Table 1.

In addition, as a comparative example, three kinds of specimens were immersed in the sea and the contact angle of water was tested in the same manner.

Effects> From the above table, no abnormality was observed in any of the marine organism adhesion prevention agents according to the present invention even after long-term immersion in the sea.

Claims (1)

[Claims] A sheet or film consisting of a mixture of a moldable material and a substance that is essentially incompatible with the material and reduces critical surface tension, the contact angle of water on the surface of the sheet or film being 98 degrees or more. A marine biofouling prevention agent characterized by: