JPS61297122A - Forming method of lining layer in water - Google Patents

Abstract

PURPOSE:To contrive an improvement in reliability and workability in corrosion prevention, by a method wherein a glass cloth surface of a specific lining sheet is stuck to an underwater lining position and the sticking position is made to cure by irradiation with ultraviolet light at the position. CONSTITUTION:A plastic film 1, glass cloth 2 impregnated with ultraviolet-curing resin and mold release paper 3 are pulled respectively at a time, passed through between application rolls 8, 8', laminated one another and a lining sheet 11 is formed. As for the lining sheet 11 formed in this manner, along with abutting of the glass cloth surface of the lining sheet 11 against a lining position of underwater structures a plastic film surface of the lining sheet 11 is stuck to the same while water is being driven out of a space between the glass cloth surface and the lining position by pressing the plastic film surface against the lining position after the mold release paper has been peeled off in the water and then a lining layer is formed by curing the ultraviolet-curing resin by irradiation with ultraviolet light at this sticking position for a desirous period of time by submerging a ultraviolet light irradiation device.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a novel lining technology used when applying underwater anti-corrosion lining to parts of marine structures etc. that are immersed in water. The present invention relates to a method for forming a lining layer in water, which has high reliability, improves work efficiency, is easy to operate, and does not require skill.

[Prior art and its problems]

As a method for preventing metal corrosion of marine structures, it is effective to apply resin lining to the structures, and in particular, resin lining is applied in advance to parts that are immersed in water.

However, when welding and assembling underwater, the pre-sealed resin lining layer is destroyed by the heat of welding, so it is necessary to repair the destroyed part (defective part) underwater after construction. It arises. Furthermore, the resin lining layer may develop defective parts due to long-term resin deterioration, external impact, peeling of the resin layer due to insufficient adhesion, etc.
The need for underwater repairs arises.

Conventionally, as a method for forming a lining layer in water, a putty-like kneaded mixture of a two-component water-resistant epoxy resin, such as a bisphenol A epoxy resin as a main material and a modified polyamide amine as a hardening material, is coated in water. However, this method has low corrosion protection reliability because it is difficult to drive out water between the putty-like mixture and the lining area, or because the physical strength of the cured product is low. Since a substance is applied and the curing time is slow, there have been disadvantages such as very poor working efficiency and difficulty in operation.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to form a lining layer in water that has high reliability in corrosion protection, improves work efficiency, is easy to operate and does not require skill, and improves the drawbacks of the above-mentioned known techniques. The purpose is to provide a method.

[Key points of invention]

In order to achieve the above-mentioned object, according to the present invention, a lining sheet is formed by laminating a glass cloth impregnated with a water-insoluble ultraviolet curable resin on a plastic film that is transparent to ultraviolet rays. The glass cloth surface is brought into contact with the lining part underwater and the plastic film surface is pressed to drive out the moisture between the glass cloth surface and the lining part, and the part is then irradiated with ultraviolet rays to cure the ultraviolet rays. The lining layer is formed by curing the resin.

[Embodiments of the invention]

Hereinafter, the present invention will be specifically explained in detail.

FIG. 1 shows a specific example of the process of forming a lining sheet used in the present invention.

1 is a plastic film through which ultraviolet rays can pass, and is pulled in the direction of the arrow through a roll 4. This plastic film 1 is transparent to ultraviolet rays and is insoluble in water, and its thickness is not particularly limited, but preferably has a thickness that follows the shape of the covering material. This ultraviolet transmittance is 200 to 4 (it is desirable that ultraviolet rays with a wavelength of 10 nanometers be as close to 100% as possible, but 1%
If it is more than 5%, it can be used, and preferably 5% or more.

Examples include, but are not limited to, polyvinylidene chloride, polyethylene terephthalate, polycarbonate-1, and polythytylene.

2 is a glass cloth, and the glass cloth 2 is impregnated with the ultraviolet curable resin 10 contained in the container 9, and then the roll 5.6
．． 6' in the direction of the arrow. The thickness of this glass cloth 2 is not particularly limited, and two or more sheets can be stacked and used if necessary.

The ultraviolet curable resin IO is a water-insoluble resin that can be cured by ultraviolet light having a wavelength of 200 to 400 nanometers, and contains a main component, a reactive diluent, a photopolymerization initiator, and other additives.

Specifically, the main component substances include urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate, ultraviolet curable silicone,
Examples include ultraviolet curable epoxy resins.

In addition, as reactive diluents, 2hydroxyethyl (meth)acrylate, 2hydroxypropyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, butoxyethyl (meth)acrylate, ethyldiethylene glycol (meth)acrylate, 2ethylhexyl (meth)acrylate, ) acrylate, cyclohexyl (meth)acrylate, phenoxyethyl (meth)acrylate, 2
Hydro3-phenyloxypropyl (meth)acrylate, dicyclopentadiene (meth)acrylate, trimethylolpropane tri(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, 1.
Examples include 6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, and tri(meth)acryloxyethyl phosphate.

Furthermore, examples of the photopolymerization initiator include 2.2 dimethoxy 2 phenylacetophenone, 2.2 diethoxy acetophenone, 1 hydroxycyclohexylphenyl ketone, benzoyl alkyl ether, benzophenone, methylbenzoyl formate, and the like. Other additives include adhesion promoters, fillers, polymerization inhibitors, colorants, and the like.

3 is a release paper, which is pulled in the direction of the arrow via the roll 7.

The plastic film 1, the glass cloth 2 impregnated with ultraviolet curable resin, and the release paper 3 are each simultaneously pulled in the direction of the arrow, passed between the rolls 8 and 8', and laminated on each other to form the lining seam 1. Form and roll or cut into desired shape.

The lining seams 1 formed in this way are formed by peeling off the release paper underwater, and then abutting the glass cloth surface of the lining sheet 11 against the lining portion of the underwater structure and pressing the plastic film surface to form the glass cloth surface. The adhesive is pasted while expelling the moisture between the lining and the lining, and then a water-retentive ultraviolet ray irradiation device is submerged in water, and this pasting area is irradiated with ultraviolet rays for a desired period of time to harden the ultraviolet curable resin. Form a lining layer.

〔Example〕

Bisphenol polypropylene oxide (
ADEKA Polyether BPX55, manufactured by Ashigata Kakogyo Co., Ltd.)
1 mol, 785 g, and tolylene diisocyanate 2 mol, 348 g 1 sibutyl tin laureate 0.1 g phenoxyethyl acrylate 1400 g, hydroquinone 1
After purging the inside of the container with nitrogen gas, the mixture was heated to 80° C. and reacted for 2 hours to form urethane acrylate as the main component.

Furthermore, 232 g of 2-hydroxyethyl acrylate (reactive diluent) was added to this reaction product, and 80 g of 2-hydroxyethyl acrylate (reactive diluent) was added.
The reaction was carried out for 2 hours at a temperature of .degree.

Next, after confirming that there are no isocyanate groups and the reaction has been completed using an infrared absorption spectrum, the reaction product is mixed with 2.2 diethoxyacetophenone (photopolymerization initiator > 50 g) and finely powdered silica (for overlay and viscosity adjustment). filler) 350g
and stirred for 2 hours until uniform, with a viscosity of 16.0.
An ultraviolet curable resin which is a probe liquid having a temperature of 00 cps/25° C. and a specific gravity of 1.16 was obtained.

Next, according to the process diagram of FIG. 1, the ultraviolet curable resin 10
was filled in a container 9, and a lining sheet 11 was obtained by using polyethylene terephthalate with a thickness of 35 mm as the plastic film 1 and plain weave cloth with a thickness of 0.25 mm as the glass cloth 2.

This lining sheet 11 is cut to an appropriate size, and the corroded parts of the underwater structure made of iron are sandblasted to expose the iron fabric.The release paper 2 is then peeled off underwater and the glass cloth surface is placed on the corroded parts. At the same time, the plastic film side was made the front surface, and the water was removed from the iron base part by hand.

After pasting, a water-retentive ultraviolet irradiation device was submerged in water, and the lining sheet 11 was irradiated with ultraviolet rays for 30 seconds to form a resin lining layer. The formed lining layer was uniform and sufficiently suitable for practical use.

Comparative Test The lining sheet obtained in the above example was attached to an iron plate measuring 150 m long, 701 m wide, and 0.8 mm thick in 3% saline solution, and then irradiated with ultraviolet rays using a 300 W mercury lamp.
Sample 1 was obtained by curing. The curing time was 30 seconds.

Further, a known underwater curable two-component epoxy resin (main ingredient: bisphenol A type epoxy resin, curing agent: putty-like kneaded product of modified polyamide amine) was applied to the same iron plate as above in 3% saline solution.

The application material is water! It was cured at 20° C. after 24 hours to obtain Sample 2.

The surface condition of these samples 1.2 was observed, and a salt spray test and a 3% saline immersion test were conducted.

The results are as follows.

Tang I” Bamboo sample 1: Smooth coating film thickness 0.5 Dragon sample 2:
Unsmooth coating film thickness 0.5 mm 1 wood eyebrow pierce wiped (according to JIS standard) Sample 1: No abnormalities for 1000 hours.

Sample 2: Rust occurred in 24 hours.

3% saline immersion test (temperature 25℃) Sample 1: No abnormality for 1000 hours.

Sample 2: Appeared within 24 hours.

As a result, it can be seen that the lining sheet according to the present invention has higher corrosion prevention reliability and a smoother coated surface than conventional two-component epoxy resins.

〔Effect of the invention〕

As described above, the present invention involves laminating a glass cloth impregnated with an ultraviolet curable resin onto a plastic film J to form a lining sheet, and bringing the glass cloth surface of this lining sheet into contact with the lining location underwater, while simultaneously applying the plastic film. The surface is pressed to expel moisture between the glass cloth surface and the lining area, and the glass cloth is pasted, and the area to be pasted is then irradiated with ultraviolet rays to cure and form a lining layer, resulting in the following effects: It is.

(1) The presence of a plastic film on the top surface of the glass cloth improves the reliability of corrosion protection, and this tendency is remarkable when a water-resistant plastic film is used.

(2) Since the glass cloth reinforces the ultraviolet curable resin, the lining layer is protected from physical external forces, and from this point of view as well, corrosion protection is highly reliable.

(3) The thickness of the lining layer can be adjusted by adjusting the thickness of the glass cloth, and therefore a thick film lining with high anti-corrosion properties φn can be achieved with a simple operation.

(4) Since a lining sheet is used, the lining method is simpler and a larger area can be lined than in the case of applying a conventional two-component epoxy resin putty-like substance.

(5) Moisture between the glass cloth surface and the lining portion can be easily expelled by pressing the plastic film surface while abutting the glass cloth surface of the lining sheet against the lining portion underwater, using a putty-like substance. Compared to conventional methods, it is easier to drive out moisture, thus improving work efficiency and reliability of corrosion protection.

(6) It is easily and quickly cured by ultraviolet irradiation, improving work efficiency.

(7) Since a lining sheet is used, a uniform lining layer with a smooth surface can be obtained.

[Brief explanation of drawings]

FIG. 1 shows a specific example of the process of forming a lining sheet used in the present invention. DESCRIPTION OF SYMBOLS 1...Plastic film, 2...Glass cloth, 10...Ultraviolet curable resin, 11...Lining sheet patent applicant Threebond Be' Co., Ltd.

Claims (1)

[Claims] A lining sheet is formed by laminating a glass cloth impregnated with a water-insoluble ultraviolet curable resin on a plastic film that is transparent to ultraviolet rays, and the glass cloth surface of this lining sheet is brought into contact with the lining location underwater, and the plastic film is removed. The glass cloth is pasted while pressing the surface to drive out moisture between the glass cloth surface and the lining area, and then this pasting area is irradiated with ultraviolet rays to harden the ultraviolet curable resin to form a lining layer. A method for forming a lining layer in water.