JP6027795B2 - Anticorrosion compound and anticorrosion tape - Google Patents

Description

  The present invention relates to an anticorrosion compound and an anticorrosion tape in which an anticorrosion compound is supported on a substrate.

  Conventionally, in various plants, etc., it is used outdoors such as pipes for structural materials, gas and water, electric pipes for laying electric wires, etc., pipes used for conveying raw materials and semi-finished products, and various storage tanks. In order to prevent corrosion of iron structures and the like that are used, anticorrosion compounds and anticorrosion tapes in which the anticorrosion compounds are supported on a base material are widely used.

For example, a tape using petrolatum is known as this anticorrosion tape. This petrolatum is also used in lubricating oils and processing oils, and is excellent in water repellency and the effect of suppressing moisture permeation. In addition, the petrolatum anticorrosion tape is widely used because of its high adhesiveness and excellent adhesion to the adherend.
However, this petrolatum has a low softening temperature. For example, when it is exposed to a high temperature by receiving direct sunlight in summer, the petrolatum may be melted and dropped. When petrolatum is dripped in this way, the problem arises that not only the anticorrosion performance of the anticorrosion tape is deteriorated, but also the adherend is soiled.
In addition, since petrolatum has high adhesiveness, dust or dust adheres to the surface as it is, and the surface is easily soiled. Usually, a protective tape or the like is provided on the outer layer. However, the work of winding a protective tape on a highly adhesive petrolatum-based anticorrosive tape is poor in workability and requires a great deal of labor.

By the way, it is known that a phenomenon called so-called bleed out in which a liquid component or the like exudes to the surface occurs in an anticorrosive compound or the like. And in petrolatum anticorrosion tape, the above bleed-out is easy to generate | occur | produce, and when this bleed-out is generated, there exists a possibility that the anticorrosion performance may be reduced not only the beauty | look after construction is impaired.
On the other hand, as shown in Patent Document 1 below, it has been studied to employ dry oil as the oil component of the anticorrosive compound.
However, when an anticorrosion tape is formed using an anticorrosion compound that employs a dry oil such as raw linseed oil as the base oil, the surface of the anticorrosion tape after construction may be quickly dried to form a film. In such a case, the gas inside may not pass through the film, and the film may be lifted from the inside to cause a foaming foam on the surface.
When such foaming occurs, not only the aesthetic appearance is impaired, but the foamed film is easily broken, and thus the anticorrosion performance may be reduced due to the tearing of the film.
That is, the conventional anticorrosion tape has a problem that the anticorrosion performance may be lowered due to factors such as bleed out and foaming, and it is difficult to maintain the anticorrosion performance immediately after construction.

JP-A-10-44320

  In view of the problems as described above, the present invention provides an anticorrosive compound capable of suppressing a decrease in the anticorrosion performance of the anticorrosion tape, and an object of the present invention is to provide an anticorrosion tape excellent in long-term sustainability of the anticorrosion performance. .

The inventors of the present invention have intensively studied the formulation of an anticorrosive compound containing an inorganic filler and an oil together with an antirust additive, and using a specific oil suppresses bleed out compared to a petrolatum anticorrosive compound. As a result, it was found that a foamed film is less likely to be formed as compared with an anticorrosive compound using a dry oil such as raw linseed oil as a base oil, and the present invention has been completed.
That is, the present invention is an anticorrosive compound containing an inorganic filler and an oil to solve the above-mentioned problems, and the anticorrosion characterized by containing the boil oil defined in JIS K 5421 as the oil. Provide compound.

According to the present invention, since the boil oil is contained in the anticorrosive compound, the bleed out is suppressed and the surface film formation can be made gentler than the anticorrosive compound using raw linseed oil. it can.
That is, bleed out from the anticorrosive compound and foam formation on the surface of the anticorrosive tape after construction can be suppressed, and the performance of the anticorrosive compound and the anticorrosive tape can be maintained for a long time.

An appearance photograph showing the foamed state when a conventional anticorrosion tape is exposed outdoors.

  Hereinafter, a preferred embodiment of the present invention will be described by taking an anticorrosion tape as an example.

  The anticorrosion tape in the present embodiment is formed in a tape shape with an anticorrosive compound supported on one side or both sides of a porous tape-like base material serving as a base material.

The tape-shaped substrate is not particularly limited as long as it can give an appropriate strength to the anticorrosion tape. For example, a woven fabric or a nonwoven fabric made of polyester fiber, polypropylene fiber, polyamide fiber or the like is used. Can do.
The thickness is not particularly limited, but is usually 0.1 to 15 mm, preferably 0.2 to 12 mm, more preferably 0.3 to 10 mm. Is desirable as a tape-like substrate of the anticorrosion tape of this embodiment.

The anticorrosive compound contains a rust preventive additive, an inorganic filler, and an oil component.
The ratio of the anticorrosive additive, the inorganic filler and the oil component contained in the anticorrosive compound can be determined as appropriate, but 1 to 10 parts by mass of the anticorrosive additive is contained per 100 parts by mass of the oil. It is particularly preferable to contain 3 to 8 parts by mass.
Moreover, it is preferable to make an anticorrosive compound contain 150-300 mass parts of inorganic fillers per 100 mass parts of oil components, and it is especially preferable to contain 200-250 mass parts.

  Examples of the rust preventive additive include higher fatty acids, carboxylic acids such as alkenyl succinic acid, sodium salts such as carboxylic acids, calcium salts, organic acid salts such as barium salts, aluminum salts, magnesium salts, sorbitan monooleate and dicarboxylic acids. Surface activity of esters such as lauryl phosphate, amines such as cyclohexylamine, anionic and cationic systems such as alkylnaphthalene sulfonate, amphoteric systems such as polyhydric alcohol esters and fatty acid sucrose esters Agents and the like.

Examples of the inorganic filler include aluminum hydroxide particles, magnesium hydroxide particles, talc particles, silica particles, clay particles, calcium carbonate particles, magnesium carbonate particles, and bentonite particles.
Among these, since aluminum hydroxide particles and magnesium hydroxide particles can be expected to function as a non-halogen flame retardant, they are suitable for imparting flame retardancy to the anticorrosion tape of this embodiment. It can be said that it is a thing.

Aluminum hydroxide particles and magnesium hydroxide particles are heated to cause a dehydration reaction, and since the dehydration reaction is an endothermic reaction, it has a function of lowering the temperature of the combustion product, and oxygen is blocked by the generated water vapor. By doing so, flame retardancy is exhibited.
Further, the aluminum hydroxide particles and the magnesium hydroxide particles also effectively act on the formation of char, and by adding these to the anticorrosive compound, when the anticorrosion tape is in contact with the flame, the surface is provided with heat insulation by the char. The flammable gas generated inside due to the temperature rise of the anticorrosion tape can permeate to the surface side in contact with the flame, or oxygen in the air can enter the anticorrosion tape and promote thermal decomposition. Can be suppressed by the char.
Also in this respect, it can be said that the aluminum hydroxide particles and the magnesium hydroxide particles are suitable as one raw material for the anticorrosion compound.

In addition, since the temperature range which raise | generates a dehydration reaction differs in aluminum hydroxide and magnesium hydroxide, a flame-retardant effect can be anticipated in a wide temperature range by using these together.
That is, it is preferable to contain both aluminum hydroxide particles and magnesium hydroxide particles in the anticorrosive compound of this embodiment.
The aluminum hydroxide particles and the magnesium hydroxide particles are desirably contained in the anticorrosive compound so that the total amount is 100 to 250 parts by mass, preferably 150 to 200 parts by mass with respect to 100 parts by mass of the oil. .
Further, the content ratio of the aluminum hydroxide particles and the magnesium hydroxide particles is not particularly limited, but it is preferable to contain more aluminum hydroxide particles having a high char forming effect. ATH) and magnesium hydroxide particles (MDH) are desirably contained in the anticorrosive compound so that the mass ratio (ATH: MDH) is 1: 1 to 2: 1.

  As the aluminum hydroxide particles and magnesium hydroxide particles, those having a median diameter of about 0.5 μm to 2.0 μm can be usually adopted. As the above-mentioned magnesium hydroxide particles, those commercially available from Kyowa Chemical Industry Co., Ltd. under the “Kisuma” series name can be used.

In addition to the aluminum hydroxide particles and magnesium hydroxide particles, the anticorrosive compound of this embodiment preferably further contains bentonite particles so that the anticorrosive compound exhibits appropriate viscosity.
As the bentonite particles to be contained in the anticorrosive compound of the present embodiment, organic bentonite particles are preferable, and organic bentonite particles obtained by ion-exchange of montmorillonite interlayer cations with quaternary organic ammonium ions are preferable.
As the organic bentonite particles, for example, those commercially available under the series names such as “Bengel” and “Esven” from Hojun Co. can be used, and preferably 10 to 50 parts by mass, preferably 100 parts by mass of the oil content. Is preferably contained in the anticorrosive compound so as to have a ratio of 20 to 40 parts by mass.

In the anticorrosive compound, at least the boil oil specified in JIS K 5421 is contained as the oil component in suppressing bleeding out from the anticorrosive tape after construction and suppressing foaming on the surface of the anticorrosive tape. is important.
In the present embodiment, as the boil oil to be contained in the anticorrosive compound, the viscosity (23 ° C.) measured based on the Gardner type foam viscometer method specified in JIS K5600-2-2 is between “A1” and “C”. It is preferable.
Moreover, as a boil oil contained in an anticorrosive compound in this embodiment, it is preferable that iodine value is 150-185, and it is especially preferable that iodine value is 160-180.
Furthermore, it is preferable that the acid value calculated | required by the method prescribed | regulated to JISK5601-2-1 as a boil oil contained in an anticorrosion compound in this embodiment.

Since such boiled oil loses its fluidity in the process of increasing the molecular weight in the same manner as the anticorrosive compound using raw linseed oil as the base oil, the boiled oil should be adopted as the oil component of the anticorrosive compound. Therefore, it is possible to prevent bleeding problems such as petrolatum-based anticorrosive compounds.
In addition, since boiled oil has a higher molecular weight reaction behavior than raw linseed oil or the like, the formation of a rapid dry film can be suppressed by adding the boiled oil to the anticorrosive compound, It is possible to suppress the formation of swollen foam on the surface of the anticorrosion tape after construction.

That is, the boil oil constitutes a polymer compound component in the anticorrosive compound after drying, and the anticorrosive compound of this embodiment reacts as the polymer compound component other than the boil oil in the same manner as the boil oil. Thus, a resin that can be used as a high molecular weight oil or a viscosity modifier can be contained.
Examples of the oil other than the boiled oil include semi-drying oil such as rapeseed white squeezed oil.

Furthermore, the anticorrosive compound of the present embodiment includes a dry oil such as raw linseed oil, boiled linseed oil, and paulownia oil having a iodine value exceeding 130, such as dry oil, walnut oil, sesame oil, soybean oil, etc. Non-drying oils having an iodine value of less than 100, such as drying oil, camellia oil, olive oil, castor oil, and coconut oil, may be included as the oil within a range where the effects of the present invention are not significantly impaired.
However, even when oil other than boiled oil and rapeseed white squeezed oil is contained in the anticorrosive compound of the present embodiment, the proportion of the total oil is preferably 10% by mass or less, and particularly preferably 5% by mass or less. Preferably, it is most preferable to set it as 1 mass% or less.

  Examples of the resin that can be used as the viscosity modifier include modified rosin resins such as xylene resin, rosin, polymerized rosin, hydrogenated rosin, and rosin ester; terpene resins such as terpene resin, terpene phenol resin, and rosin phenol resin. Resins; aliphatic, aromatic and alicyclic petroleum resins; coumarone resins, styrene resins, alkylphenol resins, and the like.

In the present embodiment, when the total amount of the compounding agent that becomes the polymer compound component in the anticorrosive compound after drying is other than the boil oil and the boil oil is 100 parts by mass, it is 50 to 80 parts by mass. It can be made to contain in an anticorrosion compound in the ratio of a mass part. Particularly preferably, it can be contained in the anticorrosive compound at a ratio of 60 to 75 parts by mass.
That is, when such an anticorrosive compound of this embodiment contains such a polymer compound component, the boil oil and other substances are in a mass ratio (boil oil: other) in a ratio of 50:50 to 20:80. It is preferable to make it contain, and it is especially preferable to make it contain in the ratio of 40: 60-25: 75.
In addition, as a polymer compound component other than the boil oil, if the anti-corrosion compound contains an oil other than the boil oil and the resin (viscosity modifier), the oil and the viscosity modifier other than the boil oil are usually , 50: 50-80: 20 mass ratio (oil content other than boil oil: viscosity modifier) can be contained in the anticorrosive compound.

In the present embodiment, the anticorrosive compound preferably contains a coupling agent such as a silane coupling agent or a titanate coupling agent in order to improve the affinity between the oil and the inorganic filler. It is preferable that the agent is contained in the anticorrosive compound at a ratio of 1 to 10 parts by mass, preferably 2 to 5 parts by mass with respect to a total of 100 parts by mass of the inorganic filler.
As the coupling agent, 3-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, decyltrimethoxysilane and the like are preferable, and decyltrimethoxysilane is particularly preferable.

In this embodiment, it is preferable to further contain a dryer such as cobalt naphthenate or calcium naphthenate in order to adjust the drying property of the oil.
The dryer is preferably contained so that the ratio with respect to 100 parts by mass of the oil is 1 to 5 parts by mass.

  In addition, an appropriate additive such as a fungicide, an antioxidant, a weather resistance imparting agent, and a thickener such as a pigment can be added to the anticorrosive compound of the present embodiment.

  In addition, since anti-corrosion compounds are usually required to have flame retardancy, organic flame retardants such as phenyl halides and diphenyl halides may be included, but the generation of hydrogen halide during combustion In addition, in order to prevent the generation of dioxins and make the anticorrosive compound environmentally friendly, it is required only by the inorganic non-halogen flame retardant such as the aluminum hydroxide particles and the magnesium hydroxide particles. It is preferable to exhibit flame retardancy, and it is preferable not to contain a halogen-based flame retardant.

However, if the organic flame retardant is simply replaced with an inorganic flame retardant, the proportion of the organic material contained in the anticorrosion compound is reduced, and as a result, the oil bleed-out may be added.
In addition, when the organic flame retardant is changed to an inorganic one, when the viscosity of the anticorrosive compound is reduced, for example, when the anticorrosive compound is spread on the adherend surface with a fingertip or a spatula, Only the surface layer portion moves, and the deep layer portion hardly moves, and there is a possibility that the surface will be finished as if the skin is rolled up and rustled.

In order to prevent such a phenomenon, it is preferable to adjust the consistency of the anticorrosive compound to 150 to 190 at room temperature (25 ° C.) by adjusting the amount of the silane coupling agent added.
Moreover, it is preferable to adjust the consistency at high temperature (50 degreeC) to 180-220.

In this specification, the “consistency” means a value measured based on JIS K2235 “Petroleum wax 5.10 consistency test method”.
Silane coupling agents are also effective in suppressing bleed out of oil.
When anticorrosive compounds contain oils such as drying oils and semi-drying oils, if these oils bleed out early, the oils may polymerize and form a polymer film on the surface. Have
Then, for example, when an anticorrosion tape is wound around the pipe body, a film is rapidly formed on the surface, and there is a possibility that the air inside and the gas generated inside expand the film in a fired state.

On the other hand, in this embodiment, since boil oil is used as the oil component and bleed-out of the oil component is suppressed by the silane coupling agent, it is even more likely that a foamed foam is formed on the surface. Will be suppressed.
In order to prevent this foaming, it is also effective to reduce the polymerization rate of the oil by reducing the amount of the dryer from the normal amount.
From such a viewpoint, the content of the silane coupling agent in the anticorrosive compound is preferably 6 to 12 parts by mass with respect to 100 parts by mass of the oil, and the content of the dryer is with respect to 100 parts by mass of the oil. It is preferably 1 to 5 parts by mass, particularly preferably 2 to 4 parts by mass.

The anticorrosive compound containing the rust preventive additive, the inorganic filler, and the oil as described above is manufactured by, for example, kneading these components using a general kneading apparatus such as a planetary mixer or a kneader. Is possible.
In addition, when the anticorrosive compound of the present embodiment contains the coupling agent, a coupling treatment is performed on the inorganic filler in advance, and the inorganic filler that has been subjected to the coupling treatment, an oil component, and the like are used as described above. Even if it knead | mixes with such a kneading apparatus, you may add a coupling agent together at the time of kneading | mixing an inorganic filler and oil.
The anticorrosive compound thus obtained can be used for the production of an anticorrosion tape by impregnating the base material, winding it around a core, and slitting it to a desired width.

  When such an anticorrosion tape is applied to a pipe material or the like, the anticorrosion tape may be partially wrapped in the width direction and wound around the surface of an object to be provided with anticorrosion properties such as the pipe material.

  At this time, since the anticorrosive compound contains the above components, formation of a surface dry film accompanied by foaming is suppressed and bleeding out is suppressed after construction.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these.

(Evaluation of coupling agent)
A silane coupling agent is added to a basic composition containing a non-halogen flame retardant composition containing organic bentonite particles, aluminum hydroxide particles, and magnesium hydroxide particles as an inorganic filler together with oil. We investigated how the consistency depends on the type of agent.
The silane coupling agent used was 3-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, and decyltrimethoxysilane at 25 ° C. when the same amount was added to the basic formulation. The penetration and the penetration at 50 ° C. were measured.
The results are shown in Table 1 below.

  From the above evaluation results, it can be seen that decyltrimethoxysilane is excellent in the effect of adjusting the anticorrosion compound.

(Evaluation of anticorrosion tape)
(Conventional example 1)
The polyester stitch-bond nonwoven fabric tape is used as a base material, and the polyester stitch-bond nonwoven fabric tape is impregnated with the anti-corrosion compound having the composition shown in Table 2 below, so that the anti-corrosion compound is supported on both surfaces of the base material with a thickness of about 1 An anticorrosion tape having a width of about 1 mm and a width of about 100 mm was produced.
The dryer in the table is a mixture of 1.15% by mass of calcium naphthenate and 0.25% by mass of cobalt naphthenate, and the silane coupling agent is decyltrimethoxysilane.

(Outdoor exposure assessment)
When this tape was half-wrapped around a 150A steel pipe and left in an environment where it was exposed to direct sunlight outdoors, as shown in FIG.

(Mock test with mercury lamp)
A sample in which the anticorrosion tape of Conventional Example 1 was wound around a 50 A pipe with a half wrap was prepared, and this sample was set in a thermostatic chamber together with a 1 kW mercury lamp.
The sample was set horizontally in a state where it floated from the bottom wall of the thermostatic bath, and a mercury lamp was set at a distance of 61 cm just above the sample.
When the mercury lamp was turned on in this state, the illuminance at the top of the sample (position at 12 o'clock when the cross section of the horizontally placed sample was viewed as a clock) was 3.3 to 3.4 mW / cm ^2. It was.
And while maintaining the inside of this thermostat at 63-65 degreeC, the sample was irradiated with light from right above with the mercury lamp, and the simulation test which simulated the outdoor exposure test was implemented.

As a result, when 3 hours passed, the surface of the sample showed gloss and the oil was bleed out.
This gloss was similarly observed not only at the top (12 o'clock position) but also at the bottom (6 o'clock position) and both sides (3 o'clock and 9 o'clock positions).
Then, the surface started to become dry after about 24 hours, and after 72 hours, the whole was almost completely dry, and it was confirmed that a film was formed on the surface.

(Example 1-6)
Similar to Conventional Example 1, except that boil oil was used instead of raw linseed oil, the amount of silane coupling agent was increased to 2% by mass, and the amount of dryer was changed as shown in Table 3 below. An anticorrosion tape was prepared.
In addition, the measurement result about the consistency of the anticorrosion compound produced in each Example is shown together in Table 3.

Regarding the anticorrosion tapes of Examples 1 to 6, Table 4 shows the results of performing a simulation test using a mercury lamp in the same manner as in Conventional Example 1.
In Table 4, the evaluation results of “dryness” by finger touch at the time of 3 hours, 7 hours, 10 hours, 24 hours, 48 hours, and 72 hours after the start of evaluation, “gloss” visually. The evaluation results for the occurrence of “foaming” are shown in the order of “drying”, “gloss”, and “foaming”.
Here, with regard to “drying”, the case where the anticorrosive compound adheres to the fingertip is determined as “x”, and the case where the anticorrosive compound adheres but the tackiness is felt is “△”, A state where the tackiness was not felt (dried) was judged as “◯”.
As for “gloss”, those with gloss (bleed out) were judged as “□” and those with no gloss were judged as “■”.
Further, regarding “foaming”, those with foaming (film swelling) were judged as “◆”, and those with no foaming were judged as “◇”.
In addition, evaluation was implemented in the position of the top part (12 o'clock), the bottom part (6 o'clock), and both side parts (3, 9 o'clock) similarly to the prior art example 1.

As described above, in each of the examples using the boil oil, no gloss due to bleed-out appears before the sample surface dries.
That is, by using the anticorrosion tape of each Example, it is possible to suppress the formation of a film that causes a blistering-like foaming after the construction.
Here, although not shown in detail, the sample in which the anticorrosion tape of Example 5 was wrapped around the tube was exposed outdoors, and the surface condition was visually observed until 3 weeks passed from the start of the exposure. It was actually confirmed that no foaming occurred.
Further, the surface condition of the sample was reconfirmed after about 4 months, but no particular abnormality including foaming was observed.

  This also shows that the anticorrosion tape using the anticorrosive compound of the present invention is less prone to blistering foam accompanying the formation of a dry film, and it is difficult to reduce the anticorrosion performance after construction. .

Claims (2)

An anticorrosive compound containing an inorganic filler and an oil,
An anticorrosive compound characterized in that the oil contains JIS K 5421 as defined in boil oil and the inorganic filler contains aluminum hydroxide particles and magnesium hydroxide particles . Anticorrosion tape anticorrosion compound of claim 1 Symbol mounting is characterized in that it is carried on one or both sides of the base material tape.