KR100383024B1 - Rainproof penetration coating for outdoor storage tank - Google Patents

Abstract

The present invention is excellent in flame resistance and water resistance, and has a sealant layer which does not cure in winter and has adhesiveness as in summer even in winter, prevents leakage of sealant layer by rainwater, its deformation by solar heat and its deterioration, The protective layer attached to the surface, and non-sticky, easy to handle, easy for field work and post-work inspection, and suppress the evaporation of the volatile components of the sealant layer and the protective layer to maintain the performance of the sealant layer and the protective layer for a long time It is composed of a surface coating layer laminated on the surface of the protective layer, thereby providing a coating material which facilitates vertical movement of the tank and prevents rainwater penetration for a long time to protect the tank from corrosion by water and salt damage.

More specifically, the coating material has a seal flame resistance and water resistance and has a tape- or sheet-like sealant layer 2 mainly composed of a rubber-like elastic material, weather resistance and low viscosity attached to one side of the sealant 2 layer. Tape- or sheet-like protective layer 3 of non-vulcanized rubber, and a surface in the form of a 25 μm-150 μm thick paper sheet, non-woven or woven fabric or plastic film laminated on the surface of the protective layer 3 It consists of a coating layer 4.

Description

Rainproof Penetration Cover for Outdoor Storage Tank

The present invention relates to a cladding that is used to prevent rainwater from penetrating from the apron position of the bottom of an outdoor storage tank to prevent rainwater penetration to protect the bottom of the tank from corrosion due to water and salt damage.

So far, a method for preventing rain from penetrating into the lower floor of an outdoor storage tank from around the apron position of the outdoor storage tank floor is to protect the surface of the apron portion of the storage tank bottom, namely annular plates or soles On the surface of the sand layer a form of sheet-like fiber based material, such as a polyester non-woven fabric or a glass fabric, applied with a putty material or rust inhibitor consisting mainly of waselin (flammable) containing tannic acid, and impregnated with the molten putter material And to form a protective layer of a liquid polymer such as urethane or silicone.

However, such conventional methods have disadvantages in performance, such that any of the low viscosity coating materials are sticky enough to adhere to the hands and clothes, and the workability becomes poor, and the coating materials move the tank contents in and out. In addition to the inability to carry out the vertical movement of the tank involved in transporting, in addition to the above, it also has the serious disadvantage of not being able to adapt to temperature changes outside the building after field work, such as rain or summer solar or temperature maintenance tanks. Deformation or evaporation due to heat in the interior or deterioration of adhesion due to hardening in winter greatly impairs the inherent rainwater penetration prevention effect, and prevents the tank from being corroded by water or salt damage for a long time.

The present invention has been made to solve the above problems, and relates to providing a rainwater ingress preventing coating material for an outdoor storage tank, the material is excellent in the flame resistance and waterproof resistance, and does not cure in winter, even in the winter adhesiveness such as summer A sealant layer having a; A protective layer attached to one side of the sealant layer to prevent leakage of the sealant layer due to rainwater, its deformation by solar heat, and its deterioration; Laminating on the surface of the protective layer, it is non-sticky, easy to handle, easy for field work and post-work inspection, and suppresses the evaporation of volatile components of the sealant layer and the protective layer to maintain the performance of the sealant layer and the protective layer for a long time. It is composed of a coating layer, which facilitates the tank to perform vertical movement and prevents rainwater infiltration for a long time to protect the tank from corrosion by water and salt damage.

In addition, it is also an object of the present invention to provide a rainwater penetration preventing coating for an outdoor storage tank which is flameproofed to the sealant layer and / or protective layer.

Rainwater ingress protection coatings for outdoor storage tanks include a tape- or sheet-type sealant layer that is shield flame resistant and water resistant and consists primarily of rubber-like elastic materials; A tape- or sheet-type protective layer of non-vulcanized rubber having weather resistance and low viscosity attached to one side of the sealant layer; And a surface coating layer which is 25 μm-150 μm thick paper or non-woven or woven fabric or plastic film laminated on the surface of the protective layer.

In the present invention, the sealant layer has excellent adhesion performance including shield flame resistance, waterproofness and low temperature dependency; A protective layer attached to one side of the sealant layer functions to prevent leakage of the sealant layer due to rainwater, its deformation by solar heat, and its deterioration; The surface coating layer of paper or non-woven or woven fabric or plastic film attached to the surface of the protective layer is non-sticky, easy to handle, easy to inspect after field work and field work, and suppress the evaporation of volatile components of the sealant layer and the protective layer By suppressing the evaporation of volatile components of the sealant layer and the protective layer to maintain the performance of the sealant layer and the protective layer for a long time to prevent rain water from penetrating into the tank when the field work is completed for a long time, Protect against corrosion.

1-5 are exploded perspective views of the rainwater penetration preventing coating material 1 for various types of outdoor storage tanks; In FIG. 1, it is a rectangular cross section; In Figure 2, it is a triangular cross section; In FIG. 3, it is a semicircular cross section; In Figure 4, it is a trapezoidal cross section; And FIG. 5 is a square cross sectional view.

The covering material 1 of any form is installed at an apron position (outer projecting portion) of the bottom of an outdoor storage tank having a complicated shape and a concave and convex portion, and any shape can be accommodated by combining the various forms.

Each of the coating 1 has a tape- or sheet-type sealant layer 2, a tape- or sheet-type protective layer 3 of non-vulcanized rubber attached to one side of the sealant layer 2, and the protection It consists of a surface coating layer 4 of paper or non-woven or woven fabric or plastic film laminated on the layer 3. In addition, the number 5 represents a release sheet.

The arrangement of each component will now be described. The sealant layer 2 used in the present invention is mainly composed of NR, butyl rubber, polyisobutylene, EPR, EPDM, BR, IR, SBR, urethane rubber, silicone rubber and other natural or synthetic rubbers free of metal corrosion. Consisting of a rubber-like elastic material composed of one or more elements selected from said sealant layer (2) optionally comprising silicic acid, silicate, clay, catalpo, talc, carbonate, alumina hydrate, titanium white, barium sulfate Inorganic fillers such as calcium carbonate, magnesium carbonate, and zinc white, organic reinforcing agents such as carbon black, high styrene resin, phenol type resin, lignin, and modified melamine resin, such as CR, IR, silicone rubber, and polyurethane Softeners such as liquid rubber, vegetable oil, mineral oil, phthalic acid type, ester type and sebacic acid type plasticizer, phenol-acetylene resin, coumarone indene resin, phenol formaldehyde type resin, It consists of binders such as silane formaldehyde resins, terpene phenolic resins, rosin and rosin inducing resins, petroleum type resins, and polyterpene resins, rust inhibitors such as tannic acid, waseline, and pitch, and anti-aging agents, if necessary Inorganic compound flame retardants such as zinc borate, antimony oxide, and aluminum hydroxide, phosphate ester type flame retardants such as tricresyl phosphate, or chloride type flame retardants such as chlorinated paraffin and perchloro pentacyclodecane.

The preferred composition ratio of the rubber and the mixed components constituting the sealant layer 2 of the present invention is 200-500 PHR of inorganic filler, 5-20 PHR of organic reinforcing agent, 30-60 PHR of liquid rubber, 10 per 100 parts by weight of rubber. Softener of -50 PHR, binder of 30-70 PHR, rust inhibitor of 15-30 PHR, anti-aging agent of 1-5 PHR and, if necessary, flame retardant of 30-80 PHR.

The above range for the mixed components is preferred because the sealant layer 2 penetrates the needle at temperatures in the range of -10 ° C to + 50 ° C, based on the capacity criteria for maintaining adhesiveness and field work at winter and summer temperatures. Is designed to be 50 mm-250 mm and adhesive force 1.0-20 kgf / 25 mm wide (for steel). And the above range is substantially flame resistant (JIS K 5400) having a penetration of chloride ions of 0.05 × 10 ⁻³ mg / cm ² or less per day in the sealant layer 2 and the viscoelasticity, while substantially not absorbing water. It is selected to give a degree of waterproofing having a water absorption of 1% or less.

In general, rubber type sealants mixed with a large amount of filler (more than 200 parts by weight per 100 parts by weight of rubber) have a penetration of at least 5 × 10 ⁻³ mg / cm ² of chloride ion per day and at least 1% water absorption (usually about 5%), which is often incompatible with the shield flame resistance and water absorption required for use as rainwater penetration inhibitors for outdoor storage tanks such as oil tanks located in coastal areas; Therefore, it was considered to have a problem based on the criteria of shield flame resistance and waterproofness.

In order to solve the above problem, a large amount of softening agent, such as an oil or a plasticizer, which has shield flame resistance and water resistance is mixed; However, mixing a large amount of softener (50 parts by weight or more per 100 parts by weight of rubber) excessively softens the sealant layer 2, resulting in poor working ability due to stickiness, and a summer runoff and winter hardening, It cannot be used for one purpose. On the other hand, even if the amount of filler to be mixed is reduced (200 parts by weight or less per 100 parts by weight of rubber), the seal flame resistance and water resistance are somewhat improved, but needle penetration and adhesion of the above degree cannot be obtained, and are intended for intended use. In use, the function of the sealant layer 2 cannot be obtained.

The sealant layer 2 of the present invention focuses on the above and does not reduce the amount of fillers or use more than the required amount of softener, and has a chloride ion permeation rate of 0.05 × 10 ⁻³ mg / cm ² or less per day and water absorption rate. It has been developed to obtain a degree of shield flame resistance and water absorption of less than 1%, substantially free from salt damage or influence of water absorption, and to successfully prevent summer sticking and hardening in winter.

Generally, in order to protect the tank from corrosion by salt damage and corrosion by water absorption, the rainwater penetration prevention material for outdoor tanks such as oil tanks, as well as low water absorption (1% or less), as well as chloride ion penetration is at least Shield flame resistance is required to be 5 × 10 ⁻³ mg / cm ² per day and preferably 0.05 × 10 ⁻³ mg / cm ² per day.

As a result of trial and error, the inventors mixed up to 50 PHR of softener (10-50 PHR) per 100 parts by weight of rubber in the presence of an inorganic filler of 200-500 PHR and at the same time 30-60 PHR of liquid rubber and 15-30 Adhesion performance less dependent on temperature using PHR rust inhibitor, excellent flame resistance (below 0.05 × 10 ^-3 mg / cm ² per day chloride penetration, JIS K 5400) and water resistance (water absorption is below 1%, JISK6911) was obtained.

In addition, to prepare the sealant layer 2 of the present invention, 30-80 parts by weight of flame retardant was required per 100 parts by weight of rubber in the presence of the other mixed components. The reason is that the use of a flame retardant of 30 PHR or less does not impart sufficient flame retardant properties to the sealant layer 2 and the use of more than 80 PHR results in loss of elasticity of the sealant layer 2 and is essential for the sealant layer 2. This is because the needle penetration of 50-250 mm cannot be maintained.

Next, the protective layer 3 which prevents the leakage of the sealant layer 2, its deformation by solar heat and its deterioration and has excellent weather resistance and low viscosity is mainly made of natural rubber EPR, EPDM, IIR, CR, polyethylene chloride, and silicone. It consists of two or more elements selected from the group consisting of synthetic rubbers such as rubber, and elastic polyvinyl chloride, and optionally fillers such as carbon black, white charcoal, clay, talc, magnesium carbonate, barium sulfate, calcium carbonate, stearic acid and Weathering pigments such as processing aids, zinc white, and titanium white, binders such as coumarone indene resin, phenol type resin, petroleum type resin, liquid rubber such as CR, IR, silicone, and urethane, paraffin type, naphthenic type , Aromatic type, oils such as vegetable oils, and softeners such as phthalic acid type, ester type and sebacic acid type plasticizers, If, having an acid which is optionally added to zinc, antimony trioxide, and sulfuric acid ester type, such as an inorganic flame retardant, tricresyl phosphate flame retardant such as aluminum hydroxide, or a chlorine type flame retardant such as chlorinated paraffin and perchlorethylene penta-cyclo decane; The obtained compound is sheeted to obtain a protective layer (3).

Although the preferred composition ratio of the rubber and mixed components constituting the sheet-like protective layer 3 which is a non-vulcanized rubber having weather resistance and low viscosity is not particularly limited, the present invention is 30-100 PHR of filler per 100 parts by weight of rubber. , Processing aid of 0.5-3 PHR, binder and / or softener of 5-50 PHR, and anti-aging agent of 1-5 PHR. In addition, the amount of flame retardant to obtain satisfactory flame retardant is 30-80 PHR. That is, when the filler is 100 PHR or more, the rubber percentage is low, and the resulting hardness is too high to obtain a soft tape having a lower viscosity. On the other hand, when it is 30 PHR or less, there exists a difficulty in a sheet process. In addition, when the binder and / or softener is 5 PHR or less, poor sheeting processing results, and in addition, the sheet or tape lacks flexibility and does not have low viscosity, which is undesirable. If the binder and / or softener is 50 PHR or more, it inhibits the flame retardation of the tape or sheet and lowers its strength; Therefore, such ratios should be avoided.

In addition, if the flame retardant is 30 PHR or less, the protective layer 3 of the non-vulcanized rubber having sufficient flame retardant properties cannot be provided, and if the flame retardant is 80 PHR or more, there is a risk of excessive additive leakage or blooming on the surface of the sheet, and the sealant This results in poor adhesion to the layer 2 or migration to the sealant layer 2, which is undesirable.

Next, the coating material 1 is prevented from sticking, can be easily handled, facilitates post-field inspection, and suppresses the evaporation of volatile components of the sealant layer 2 and the protective layer 3 to prevent the sealant layer 2. ), And a paper, non-woven fabric, woven fabric, or plastic film such as PE, PET, PP, nylon, or PVC is used for the surface coating layer 4 which maintains the performance of the protective layer 3 for a long time. The thickness of the surface coating layer 4 is suitably 25 micrometers-150 micrometers. This prevents the evaporation of the volatile components of the sealant layer 2 and the protective layer 3 while maintaining the performance for a long time in view of laminating the tape- or sheet-type protective layer 3 having a low viscosity within a given range. This is because it is necessary to maintain the workability including maintaining the weather resistance, maintaining the flexibility, and maintaining the strength.

If necessary, a surface coating layer 4 coated with a waterproofing agent is used.

6 is a view showing an embodiment using the covering material 1 of the present invention. Outdoor storage tank from an outwardly extending area (annular plate (or bottom plate) 7 and bum 8) of an outdoor storage tank 6 such as a petroleum tank and also from an asphalt sand layer 9 which protects the area. (6) In order to prevent rainwater from penetrating, the covering 1 is attached to the side plate and the surface of the asphalt sand layer 9. The attachment to the outdoor storage tank 6 and the asphalt sand layer 9 is carried out by a sealant layer 2 of the cladding 1. Prior to attachment, the attachment surfaces of the outdoor storage tank 6 and the asphalt sand layer 9 are well cleaned to remove rust and dirt. In addition, it is possible to apply the additional coating material 1 after applying the separation coating material 1 prepared in advance according to the model for the corners and the concave surface.

The covering 1 used in the present manner is arranged on the surface of the sealant layer 2, the tape- or sheet-type protective layer 3 of non-vulcanized rubber, and the protective layer 3, as described above. Since it consists of a surface coating layer 4 in the form of a plastic film, its ability to perform vertical movement of the tank is not only ensured, but also develops various functions during and after field work.

That is, since the sealant layer 2 forming the main component of the coating material 1 is made of a limited mixed composition mainly composed of rubber-like elastic materials, its temperature dependency is low, less sticky and less deformable in summer Hardness changes less during winter. In addition, since the sealant layer 2 naturally functions as a sealant (soft and very easily extendable along the asphalt sand layer 9 and the tank 6 and exhibit good adhesion), the outdoor storage tank 6 or asphalt Since a space cannot be formed between the side plate of the sand layer 9 and the covering material 1, rainwater can be prevented from penetrating therefrom. In addition, although the sealant composition contains a large amount of fillers, it has excellent seal flame resistance and water resistance, and rainwater cannot penetrate in any season, and satisfactory rainwater penetration prevention effect is developed. As a result, corrosion of the lower part of the outdoor storage tank 6 due to rainwater penetration or salt damage can be prevented in all seasons.

On the other hand, the protective layer 3 forming other main components of the coating 1 prevents the leakage of the coating due to rain after field work. In addition, it accommodates the expansion and contraction of the sealant layer 2 due to season and temperature after field work to prevent the sealant layer 2 from tearing or warping, while at the same time suppressing the radical flow of the sealant layer 2 Excellent shape retention after field work. In addition, this prevents the degradation of the sealant layer 2 due to solar heat. Therefore, the life of the covering material 1 can be extended.

In addition, together with the sealant layer 2, the protective layer 3 independently provides flame resistance, so that even if the flame falls on the coating material 1 when welding the tank for repair, the coating material 1 does not burn. Or even if it burns, the protective layer 3 is effective in preventing the fire from spreading.

In addition, the surface coating layer 4 provided on the surface of the protective layer 3 has, of course, weather resistance, and functions to suppress evaporation from the sealant layer 2 and the protective layer 3 during the summer. Thus, this maintains the essential performance of the sealant layer 2 and the protective layer 3 for a long time.

In addition, since the coating | cover 1 did not stick to a hand, operation at the time of field work was improved. It also prevents dirt and dust from adhering to the soft sealant layer (2) and the low viscosity protective layer (3) and allows the person to walk on the covering material (1) without worrying that the shoe will stick to it for on-site inspection. To be able. In addition, the cladding 1 is often used in an overlapped state during field work; Even in such a case, since it does not adhere to the sealant layer 2, there is no problem in field work. In addition, the protective layer 3 can be easily removed by hand due to the low viscosity of the protective layer 3 even when the surface coating layer 4 needs to be peeled off or changed during or after field work; Thus, it can be peeled off or replaced with a new one.

Example 1 (1)

A protective layer (thickness 1.5 mm) obtained by sheeting a compound composed mainly of EPDM was attached to the surface of the shield flameproof waterproof sealant layer (thickness 3.5 mm), and then a surface coating layer in the form of a polyethylene film (thickness 30 μm) was formed. Laminating on the surface to form a 20 mm wide and 5 m long rainwater barrier.

The composition of the protective layer is as follows:

Polymer (EPT / EPDM / IIR) Approx. 45%

Filler approx. 20%

29% flame retardant

Antioxidant About 1%

Lubricant, active agent approximately 5%

The composition of the sealant layer is as follows:

Polymer (modified butyl / EPT) about 65%

Filler approximately 30%

Oil about 5%

50 of these materials were used to measure rainwater penetration protection against the surface of the layer of asphalt sand 9 that protects the outer protruding portions (ie annulus and bore) of the 110,000 km outdoor storage tank.

After 5 years of field work, the quality inspection of the field work found no "break", "break", "expansion", or "crack" in the cladding (1), and the initial good surface and adhesion state after the field work Proved to be maintained. In addition, the rainwater ingress coating was peeled off and inspected for corrosion at the bottom of the tank, and no traces of rainwater penetration and corrosion at the bottom of the tank due to water or salt damage were found.

In addition, the sealant layer portion was cut and inspected for shield flame resistance (JIS K 5400) and water absorption (JIS K 6911), and very good shield flame resistance and water resistance were maintained, so that chloride ion penetration was 0.037 × 10 ^-3 per day. It was observed that mg / cm ² and the water absorption was 0.023%.

Example 1 (2)

The surface coating layer in the form of a non-woven fabric (thickness 70 μm) was formed by attaching a protective layer (thickness 2 mm) obtained by sheeting and flame retarding a compound composed mainly of natural rubber to the surface of the flameproof sealant layer (thickness 2 mm). It was laminated on the protective layer surface to form a 30 mm wide and 3 m long rainwater barrier.

The protective layer is as follows.

Polymer (NR / EPT / IIR) Approx. 45%

Filler approx. 20%

29% flame retardant

Antioxidant About 1%

Lubricant, active agent approximately 5%

The composition of the sealant layer is as follows:

Polymer (LIR) Approx. 32%

About 53% filler

8% of resin

Oil, anti-aging agent, and other substances about 7%

60 of these materials were used to measure rainwater penetration protection against the surface of the asphalt sand layer protecting the outer overhangs (ie annulus and bore) of the 60,000 km outdoor storage tank.

After five years of field work, the quality inspection of the field work finds no "breaks", "breaks", "expanses", or "cracks" in the cladding, and the initial good surface and adhesion after the field work can be maintained. Proved that. In addition, the rainwater ingress coating was peeled off and inspected for corrosion at the bottom of the tank, and no traces of rainwater penetration and corrosion at the bottom of the tank due to water or salt damage were found.

In addition, the sealant layer and the protective layer were partially cut and inspected for flame retardant (fire retardant test method according to Fire Danger No. 57) and water absorption rate (JIS K 6911), and there was no change in the flame retardant for both the sealant layer and the protective layer. In particular, it was found that excellent flame resistance corresponding to VO was maintained.

In addition, the sealant layer was inspected for shield flame resistance (JIS K 5400) and water absorption (JIS K 6911) and very good shield flame resistance and water resistance were maintained so that chloride ion penetration was 0.038 × 10 ^-3 mg / cm per day. ² and the water absorption was observed to be 0.035%.

As described so far, the coating material according to the present invention is a sealant layer having excellent seal flame resistance and water resistance, which is not cured in winter and has adhesiveness as in summer even in winter; A protective layer attached to one side of the sealant filler to prevent leakage of the sealant layer due to rain water, its deformation by solar heat, and its decay; Laminated on the surface of the protective layer, it is non-sticky, easy to handle, easy for field work and post-work inspection, and consists of a surface coating layer that keeps the performance of the sealant layer and the protective layer for a long time by suppressing the evaporation of the sealant layer and the protective layer. It protects the tank from corrosion by water and salt damage by making it easy to carry out vertical movement of the tank and preventing rainwater intrusion for a long time.

Further, according to the present invention, it is an advantage that the flameproof treatment of the sealant layer and / or the protective layer ensures safety against fire.

1 is a partially exploded perspective view, having a rectangular cross section, presenting an embodiment of the invention.

2 is a partially exploded perspective view, with a triangular cross section, presenting an embodiment of the invention.

3 is a partially exploded perspective view, with a semi-circular cross section illustrating an embodiment of the invention.

4 is a partially exploded perspective view, having a trapezoidal cross section showing an embodiment of the invention.

5 is a partially exploded perspective view, with a square cross section illustrating an embodiment of the invention.

6 is a longitudinal sectional view illustrating an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: Rainwater penetration prevention material 2: Sealant layer

3: protective layer 4: surface coating layer

Claims (3)

A tape- or sheet-type sealant layer having a seal flame resistance and water resistance and composed mainly of a rubber-like elastic material; A tape- or sheet-type protective layer of non-vulcanized rubber having weather resistance and low viscosity attached to one side of the sealant layer; And a rainwater penetration prevention coating for an outdoor storage tank consisting of a surface coating layer in the form of a 25 μm to 150 μm thick paper sheet, a nonwoven or woven fabric or a plastic film laminated on the surface of the protective layer. The rainwater penetration preventing coating material for an outdoor storage tank according to claim 1, wherein the sealant layer and / or the protective layer are flameproofed. The tape according to claim 1 or 2, wherein the sealant layer has a seal flame resistance corresponding to a chloride ion penetration of 0.05 × 10 ⁻³ mg / cm ² or less per day and a water resistance corresponding to water absorption of 1% or less. Or in the form of a sheet-type sealant composition.