JPH0827439A - Curable type anticorrosive tape - Google Patents

Abstract

PURPOSE:To obtain a curable type anticorrosive tape, rich in heat resistance and capable of realizing an anticorrosive surface having a high surface hardness. CONSTITUTION:This curable type anticorrosive tape is obtained by forming tacky agent layers prepared by adding an incombustible agent, a rust preventing agent and a light shielding agent, etc., to a resin curable in air and waxes as principal components on both surfaces of a substrate, housing the resultant tape in an airtight container and removing a gas in the container. The amounts of the resin and waxes based on the total amount of the tacky agent composition except a solvent are 25-45wt.% resin and 8-18wt.% waxes.

Description

Detailed Description of the Invention

The present invention relates to a curable anticorrosion tape. More specifically, the present invention relates to a curable anticorrosion tape which provides an anticorrosion surface having high heat resistance and high surface hardness.

[0002]

2. Description of the Related Art Adhesive resin, waxes, incombustible agents, rust preventives, and light blocking agents are attached to the surface of pipes to prevent corrosion of pipes for transferring high-temperature fluid and pipes exposed to the sun outdoors. For example, coating with a paint containing the same or the like or an anticorrosion tape using the same composition as an adhesive is disclosed in, for example, Japanese Patent Publication No. 62-416.
As described in Japanese Laid-Open Patent Publication No. 25, it has been carried out better than before.

However, since the above-mentioned paints and anticorrosion tapes all have poor heat resistance, and also have low surface hardness and softness, workers and inspectors need to use these pipes when laying pipes or at regular inspections. When you walk on the equipment, hang ropes, or rub it with a transported object, the anticorrosion tape may scratch the anticorrosion surface, causing rainwater to enter from the area and cause corrosion of the piping. It was

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to provide a curable anticorrosion tape which solves the above-mentioned problems of conventional products and is capable of realizing an anticorrosion surface having high heat resistance and high surface hardness. Is.

[0005]

According to the present invention, 25 to 45% by weight of a resin curable in air and 8 to 18% by weight of waxes are used on both surfaces of a substrate, based on the total amount of the pressure-sensitive adhesive composition excluding a solvent. %, The non-flammable agent, the rust preventive agent, the light blocking agent, etc. are added to this, and the adhesive layer is provided and stored in an airtight container, and the gas in the container is excluded. The gist of the invention is a characteristic curable anticorrosion tape.

In the present invention, the resin which can be cured in air is, for example, a known resin such as an alkyd resin or an acrylic resin, or a resin having a polymerizable functional group such as a vinyl group which is modified or a crosslinking agent. It may be a composition blended with a crosslinking accelerator or the like. Among them, vinyl-modified alkyd resins crosslink when exposed to air and have a robust film forming performance, so they are suitable for use as a composition containing waxes, flame retardants, rust preventives, light blocking agents, etc. To be done. The resin may be used in a single kind, or two or more kinds may be used in an appropriate proportion.

If the amount of the above-mentioned resin is more than 45% by weight based on the total amount of the pressure-sensitive adhesive composition excluding the solvent, when the obtained curable anticorrosive tape is used for anticorrosion work,
The curable anticorrosion tape is hardened by contact with air to form a hard surface having a pencil hardness of about 3H, which will be described later. However, mainly because the drying speed is remarkably increased, the production of the curable anticorrosion tape becomes difficult. When the curable anticorrosion tape obtained is used to perform anticorrosion work, the curable anticorrosion tape cures by contact with air, but has a pencil hardness of about H, which is desirable. Hard hardness cannot be obtained.

In the present invention, the waxes are water-repellent, for example, petroleum wax such as paraffin wax and microcrystalline wax, coal wax,
Known waxes such as animal and vegetable wax, synthetic wax, petrolatum, petrolatum oxide, oxidized wax, metal salts or esters of these, and lanolin metal salt can be used.

If the amount of the above waxes is more than 18% by weight based on the total amount of the pressure-sensitive adhesive composition excluding the solvent, the curable anticorrosive tape obtained can be used to perform the anticorrosion work. The type anticorrosion tape hardens when exposed to air,
The pencil hardness is H to HB, a desired high hardness cannot be obtained, and when it is less than 8% by weight, it is difficult to manufacture a curable anticorrosion tape mainly because the drying speed is remarkably increased. Not preferable for the reason.

Further, in the present invention, the pressure-sensitive adhesive composition comprises
In addition to the above resins and waxes, nonflammable agents, rust preventives, light blocking agents, adhesive resins, etc. are added. As the nonflammable agents, for example, aluminum hydroxide can be used, and rust preventives For example, tannic acid or the like can be used, and as the light blocking agent, for example, aluminum paste or the like can be used. In addition to these, known agents exhibiting the respective properties can be used in accordance with the object of the present invention. Can be appropriately selected and used.

An organic solvent can be used as a solvent used for producing a curable anticorrosion tape using the above-mentioned pressure-sensitive adhesive composition, and the amount thereof is appropriately determined depending on the composition of the pressure-sensitive adhesive composition. And it is not constant. The organic solvent is not particularly limited, but is an aliphatic or aromatic hydrocarbon solvent such as terpene, petroleum spirit, petroleum naphtha, xylene, toluene, decalin, and tetralin, methyl isobutyl ketone, methyl-n-amyl ketone. A solvent capable of dissolving the above resin and wax is appropriately selected from ketone solvents such as cyclohexanone and ester solvents such as butyl acetate, amyl acetate and isopropyl acetate.

In the present invention, the base material can sufficiently hold a viscous pressure-sensitive adhesive and any sheet-like material having appropriate flexibility can be used. For example, cotton, Examples include cloth made of natural fibers such as hemp, cloth made of synthetic fibers such as polyester, and non-woven fabric made of these fibers. A polyester non-woven fabric having excellent weather resistance, thinness, and high strength is particularly preferably used.

Further, these substrates have a thickness of 0.5 to 0.7.
A material having a basis weight of about 80 to 120 g / m ² is preferably used.

[0014]

The function of the curable anticorrosion tape of the present invention is
25-45% by weight of a resin curable in air, 8-18% by weight of waxes, based on the total amount of the adhesive composition excluding the solvent
The main component of which is a non-combustible agent, a rust preventive, a light blocking agent, and the like are applied, and a pressure-sensitive adhesive composition is applied. By adding rust preventives, light blocking agents, adhesive resins, etc.,
Since the pressure-sensitive adhesive composition is in the state of a viscous solution to the extent that gelation has just started, the coating can be carried out very easily as shown by the drying property (finger tip drying).

Since the curable anticorrosion tape coated as described above is housed in an airtight container and the gas in the container is removed, the container is unsealed during various anticorrosion works.
When, for example, an outdoor pipe that is a target of anticorrosion coating is wound and its surface is coated, the pressure-sensitive adhesive layer causes a crosslinking reaction by the surrounding air to cure the pressure-sensitive adhesive layer. Therefore,
After the construction, the surface subjected to the anticorrosion work showed a hardness of 2H, which is harder than the surface hardness (pencil hardness 1H) of the hard vinyl chloride resin plate, and in addition, the heat resistance and the water absorption rate were significantly improved. Show performance. Also, salt spray test, weather resistance,
Insulation resistance, flammability test, and various properties such as tensile strength also fully meet the standard values.

As described above, the curable anticorrosion tape of the present invention comprises:
After the anticorrosion work, it provides a surface that is heat resistant and has a large surface hardness that is less likely to be scratched, so it is necessary to prevent corrosion of pipes for transferring high temperature fluid and pipes exposed to the sun outdoors. Therefore, it can be used in a wide range of applications on pipes and other surfaces, and workers and inspectors can walk on these pipes, hang ropes, etc. when laying pipes or during regular inspections. When rubbing with a transported object, there is no fear that the anticorrosive surface formed by the curable anticorrosive tape of the present invention will be scratched and rainwater will intrude from the part to corrode pipes.

[0017]

EXAMPLES The present invention will be described below based on examples.
The anticorrosion tapes obtained in the following examples were measured and evaluated by the following methods.

1. Salt spray test Measured according to JIS Z-2371 (salt spray test method), the test piece was exposed to salt spray for 2,000 hours, washed with water and dried, and the anticorrosion tape was peeled from the test piece.
The presence or absence of rust on the surface of the steel sheet was visually observed and evaluated. For the test piece, a hardening type anticorrosion tape of Examples and Comparative Examples of the present invention was attached to a steel plate having a length of 150 mm, a width of 70 mm, and a thickness of 0.8 mm so that each surface was completely covered.
The test piece was left at 3 ° C. for 24 hours.

2. Weather resistance test Using a sunshine weatherometer, after exposing the same test piece used in the test in the previous section for 2,000 hours, peel the anticorrosion tape from the test piece and visually check the surface of the steel plate for rust. Was observed and evaluated.

3. Insulation resistance value Measured according to JIS Z-1902 (Petrolatum-based anticorrosion tape), and a standard value of 1.0 × 10 ² MΩ · m ² or more was regarded as a pass. For the test piece, a 50 mmφ steel pipe was wound with 50 mm wide curable anticorrosion tapes of Examples and Comparative Examples of the present invention so as to overlap with each other by 50%, and the steel pipe surface was attached so as to be completely covered. The test piece was left at 24 ° C. for 24 hours.

4. Flammability test Measured in accordance with Fire Service Agency, September 25, 1976, Circular No. 57 (criteria of flame retardancy of urethane foam as a heat insulating material for outdoor storage tanks), standard value, combustion A time of 120 seconds or less and a burning length of 60 mm or less was passed.

5. Water absorption rate Measured in accordance with JIS K-6911 (General test method for thermosetting plastics).

6. ~ 7. Thickness, tensile strength, the thickness and tensile strength of the curable anticorrosion tape were measured according to JIS Z-1902 (Petrolatum-based anticorrosion tape).

8. Heat resistance The heat resistance of the curable anticorrosion tape was measured according to JIS Z-1902 (Petrolatum-based anticorrosion tape).

9. Hardness According to JIS K-5400 (General paint test method),
The pencil hardness test was done by hand using the same test pieces used in the test of Section 1.

10. Drying property Measure the time required for drying (finger tip drying) until the sample is exposed to an environment of 23 ° C and tapped with a finger to prevent the adhesive from the base material adhering to the fingertip and pulling the thread. did.

Example 1 Vinyl-modified alkyd resin (Arakawa Chemical Co., Ltd., trade name: Arachid, solid content 70% by weight)
40.0 parts by weight, microcrystalline wax (manufactured by Shimabo Trading Co., Ltd., product name: Saki 500, solid content 70% by weight, of which:
35% by weight is uniform of 30.0 parts by weight of rust preventive agent: calcium sulfate, 30.0 parts by weight of aluminum hydroxide (manufactured by Showa Denko KK), 0.3 parts by weight of tannic acid, and 2.0 parts by weight of aluminum paste. The mixture was stirred and mixed to prepare an adhesive consisting of a viscous dispersion. Then, with the coating device shown in FIG.
The above-mentioned pressure-sensitive adhesive 2 was applied to both sides of the substrate 1 by using a polyester-based nonwoven fabric having a basis weight of 100 g / m ² . The obtained pressure-sensitive adhesive was viscous but did not gel, had sufficient fluidity upon application, and could be smoothly applied as described below.

The pressure-sensitive adhesive 2 is supplied to the vat 3 provided on the lower surface of the coating device by a supply device (not shown), and is applied to the substrate 1 from the discharge port 5 by the gear pump 4. The pressure-sensitive adhesive 2 is supplied to the upper surface of the base material 1 at the same time as passing through the surface of the base material 1 and also from the side surface to the lower surface. The gears 6, 6 ensure the impregnation and adhesion of the adhesive 2 on the upper and lower surfaces of the base material 1.

Reference numeral 7 is a pair of pulling rolls, 8 is a slit for adjusting the coating thickness of the adhesive 2 to a set value, and 9 is before the slit 8 and additionally adhesive. It is a discharge port for supplying 2. In this way, the substrate 1
The adhesive tape 10 coated with the adhesive 2 has a thickness of 0.
The product was finished as a product of 9 mm, 150 mm in width and 10 m in length, and immediately put in a container such as a vinyl bag capable of keeping airtightness, air inside the vinyl bag was removed, and the product was sealed and stored. The performance of the obtained adhesive tape is shown in Table 1.

Example 2 Vinyl-modified alkyd resin (Arakawa Chemical Co., Ltd., trade name: Arachid, solid content 70% by weight)
35.0 parts by weight, microcrystalline wax (manufactured by Shimane Trading Co., Ltd., product name: Saki 500, solid content 70% by weight, of which:
35% by weight is a uniform composition of 35.0 parts by weight of a rust preventive agent: calcium sulfate, 30.0 parts by weight of aluminum hydroxide (manufactured by Showa Denko KK), 0.3 parts by weight of tannic acid, and 2.0 parts by weight of aluminum paste. The mixture was stirred and mixed to prepare an adhesive consisting of a viscous dispersion. The obtained pressure-sensitive adhesive was viscous, but did not gel, and had sufficient fluidity when applied. Then, in the same manner as in Example 1 using the coating apparatus shown in FIG. The performance of the obtained adhesive tape is shown in Table 1.

Comparative Example 1 Vinyl-modified alkyd resin (Arakawa Chemical Co., Ltd., trade name: arachid, solid content 70% by weight)
20.0 parts by weight, microcrystalline wax (manufactured by Shimabo Trading Co., Ltd., product name: Saki 500, solid content 70% by weight, of which:
35% by weight is uniform of 50.0 parts by weight of rust preventive agent: calcium sulfate, 30.0 parts by weight of aluminum hydroxide (manufactured by Showa Denko KK), 0.3 parts by weight of tannic acid, and 2.0 parts by weight of aluminum paste. The mixture was stirred and mixed to prepare an adhesive consisting of a viscous dispersion. Then, in the same manner as in Example 1 using the coating apparatus shown in FIG. The above-mentioned pressure-sensitive adhesive was gelled and could be applied, but the drying was slow and the production speed had to be reduced. The performance of the obtained adhesive tape is shown in Table 1.

Comparative Example 2 Vinyl-modified alkyd resin (Arakawa Chemical Co., Ltd., trade name: arachid, solid content 70% by weight)
50.0 parts by weight, microcrystalline wax (manufactured by Shimabo Trading Co., Ltd., product name: Saki 500, solid content 70% by weight, of which:
35% by weight is uniform of 20.0 parts by weight of rust preventive agent: calcium sulfate, 30.0 parts by weight of aluminum hydroxide (manufactured by Showa Denko KK), 0.3 parts by weight of tannic acid, and 2.0 parts by weight of aluminum paste. The mixture was stirred and mixed to prepare an adhesive consisting of a viscous dispersion. Then, in the same manner as in Example 1 using the coating apparatus shown in FIG. 1, an attempt was made to apply the above-mentioned pressure-sensitive adhesive 2 to both surfaces of the base material 1, but the above-mentioned pressure-sensitive adhesive had a low viscosity and dried. The speed was fast and coating was completely impossible.

[0033]

[Table 1]

As is clear from Table 1, in the case of Examples 1 and 2 of the present invention, when anticorrosion work was carried out using the obtained curable anticorrosion tape, the curable anticorrosion tape was exposed to air. Hardened, and all formed a hard surface having a pencil hardness of 2H. Further, the water absorption rate was improved by 40% as compared with Comparative Example 1, and the heat resistance was similarly from 120 ° C. to 1%.
It was confirmed that the temperature was improved to 50 ° C.

[0035]

EFFECT OF THE INVENTION The curable anticorrosion tape of the present invention comprises, on both surfaces of a base material, 25 to 45% by weight of a resin curable in air and 8 to 18% of waxes, based on the total amount of the pressure-sensitive adhesive composition excluding a solvent.
A pressure-sensitive adhesive composition containing, as a main component, wt% and a nonflammable agent, a rust preventive, a light blocking agent, etc. is applied. Agent,
By adding rust preventive agent, light blocking agent, adhesive resin, etc., the adhesive composition is in the state of a viscous solution to the extent that gelation has just started, so it also appears in dryness (finger tip drying). As described above, the coating can be performed very easily.

Since the curable anticorrosion tape coated as described above is housed in an airtight container and the gas in the container is removed, the container is unsealed during various anticorrosion works.
When, for example, an outdoor pipe that is a target of anticorrosion coating is wound and its surface is coated, the pressure-sensitive adhesive layer causes a crosslinking reaction by the surrounding air to cure the pressure-sensitive adhesive layer. Therefore,
After the construction, the surface subjected to the anticorrosion work showed a hardness of 2H, which is harder than the surface hardness (pencil hardness 1H) of the hard vinyl chloride resin plate, and in addition, the heat resistance and the water absorption rate were significantly improved. Show performance. Also, salt spray test, weather resistance,
Insulation resistance, flammability test, and various properties such as tensile strength also fully meet the standard values.

As mentioned above, the curable anticorrosion tape of the present invention comprises:
After the anticorrosion work, it provides a surface that is heat resistant and has a large surface hardness that is less likely to be scratched, so it is necessary to prevent corrosion of pipes for transferring high temperature fluid and pipes exposed to the sun outdoors. Therefore, it can be used with a wide range of applications on pipes and other surfaces, and when laying pipes or during regular inspections, workers and inspectors can walk on these pipes, hang ropes, etc. When rubbing with a transported object, there is no fear that the anticorrosive surface formed by the curable anticorrosive tape of the present invention will be scratched and rainwater will intrude from the part to corrode pipes.

[0038]

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of an apparatus for producing a curable anticorrosion tape of the present invention.

[0001]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Adhesive 3 Bat 4 Key pump 5 Discharge port 6 Gear wheel 7 Tension roll 8 Thickness adjusting slit 9 Discharge port 10 Curing type anticorrosion tape

Claims (1)

[Claims] 1. A main component is 25 to 45% by weight of a resin curable in air and 8 to 18% by weight of waxes, based on the total amount of the pressure-sensitive adhesive composition excluding a solvent, on both sides of a base material. A hardening type anticorrosion tape, characterized in that it is provided with an adhesive layer to which a nonflammable agent, a rust preventive agent, a light blocking agent and the like are provided, and is housed in an airtight container to eliminate gas in the container.