JPS5987119A - Method of covering piping with insulating sheathing - Google Patents

Abstract

PURPOSE:To apply a weather-resistant seamless sheathing, by applying an elastic coating on one surface of a core material that uses as a base a plastic film, and an adhesive sheet on the other surface, and peeling off a release paper from the adhesive sheet. CONSTITUTION:The circumference of a water delivering pipe 1 is enclosed with an insulating material 2 having a thickness of 20mm., and the adhesive sheet 3 that is flexible, weather resistant, moisture impermeable and alkali-resistant is wound around and stuck to the insulating material 2. A saturated polyester film 4 having a thickness of 100mum is used as a core material, a coating 5 of a silicone type material having a thickness of 300mum that has weathering property, etc. is applied on the surface of the film 4, and a fire retardant adhesive layer 6 of a butyl rubber type material having a thickness of 500mum is provided on the undersurface of the film 4. When the adhesive sheet 3 is wound around and stuck to the insulating material 2, the release paper 7 is peeled off and the winding is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for applying a heat insulating coating to pipes for transporting clean water, chestnut water, steam, hot water, hot water, and the like.

For example, drinking water and firefighting water for bridges and tunnels.

When laying water pipes for industrial water, etc., it is necessary to apply a heat insulating coating to prevent them from freezing in the winter. Also,
For example, when a steam pipe for geothermal power generation is installed inside a tunnel, it is necessary to provide a heat insulating coating to prevent heat dissipation. In addition, there are many cases of water leakage in tunnels, so water resistance and moisture impermeability are required, and the above-mentioned alkali and acid resistance must also be provided.

Conventionally, insulating materials used when applying heat insulating coatings to piping have properties suitable for insulation, but they must be able to maintain their shape, prevent damage from external objects, and prevent the insulation from rainwater or water. It is necessary to provide an exterior covering to prevent it from getting wet with groundwater, etc.

The construction method for the above exterior is to cover the outermost periphery with a metal plate such as galvanized steel plate, aluminum 4-panel, or colored iron plate, and then hook the joints of the metal plates to form the outer shell. is used. However, since a long bridge, for example, is subject to large shaking phenomena and photography due to wind, rain, ground, etc., the piping attached to the bridge is subject to bending and vibration. Furthermore, bridges are constantly subjected to vibrations caused by vehicles passing through the bridge and changes in pressure within the pipes. Moreover, expansion and contraction due to temperature changes are constantly repeated. Due to these external factors, there is a risk that the seams of the exterior metal plates may come off. If the nozzle hooks come off, not only will the insulation material swell due to intrusion of rainwater or underground water, reducing the insulation effect, but also the exterior metal plate will fall, causing damage to the width of railway cars, automobiles, etc.
There is a risk of causing serious accidents to ships and people.

For example, piping installed on offshore bridges is constantly exposed to wind and rain, and sometimes encounters gusts and storms of several tens of meters, as well as severe cold. It is located in Furthermore, since piping for geothermal power generation is often installed in a volcanic gas atmosphere, corrosion resistance is required for the heat insulating coating.

The metal plate exterior material used in the conventional piping insulation coating method is coated with a corrosion-resistant coating, but because the coating is thin and hard, it may peel off due to flexing or deformation of the exterior material due to flexing of the piping or photography. It is easy to be damaged by external objects, and the durability of the corrosion-resistant function is insufficient. In such cases, there is a risk of damage caused by welding sparks, so the piping insulation coating must be !+!1#, flammable.

In addition, the construction of heat-insulating coatings for piping is often difficult, such as work at heights in the case of bridges, and in narrow spaces in tunnels, etc. It is desirable to have a method that can be easily constructed without using special mechanics.

The present invention has been made in view of the above-mentioned point (1), and is capable of deforming by adapting to the bending and perturbation of piping, has no risk of damage due to corrosion, and is weatherproof, flame retardant, corrosion resistant, and The purpose of the present invention is to provide a piping diaphragm cover that can easily construct a tight-fitting exterior that is impermeable, water resistant, strong wind resistant, cold resistant, photographic resistant, acid resistant, and alkali resistant.

In order to achieve the above object, the heat insulating coating method of the present invention is weather resistant, flame retardant, corrosion resistant, moisture impermeable, water resistant, strong wind resistant, and has rubber elasticity on one side of the core material made of plastic film.
In addition to applying a cold-resistant, vibration-resistant, acid-resistant, and alkali-resistant coating, a flame-retardant adhesive layer with rubber elasticity was formed on the other side of the core material [7], and release paper was pasted on the surface of the adhesive layer. Prepare an adhesive sheet in advance, peel off the release paper of the adhesive sort, wrap it around the outer periphery of the heat insulating material that wraps the pipe, and apply the above coating to the seams of the adhesive sheet with a glass cloth tape interposed. weatherproof, flame retardant, corrosion resistant, moisture impermeable, water resistant, strong wind resistant, cold resistant, vibration resistant, acid resistant,
It is characterized by forming an alkali-resistant seamless heat-insulating sheath.

Next, one embodiment of the present invention will be described with reference to FIGS. 1 and 2. In this embodiment, a ductile cast iron pipe for water conveyance with an outer diameter of 220 mm is attached to a bridge built across a strait and is coated with heat insulation.

The water pipe 1 is surrounded by a heat insulating layer 2 with a thickness of 20 mm.

In this example, a heat insulating material conforming to the standard of JISA9511-1980 foam polystyrene heat insulating material No. 3 was used.

A flexible weather-resistant, flame-retardant, moisture-impermeable, water-resistant, strong wind-resistant, cold-resistant, photography-resistant, acid-resistant, and alkali-resistant adhesive sheet 3 is wrapped around the outer periphery of the heat insulating material 2 and pasted.

In this example, the weatherproofing and
A flame retardant, corrosion resistant, moisture impermeable, water resistant, strong wind resistant, cold resistant, vibration resistant, acid resistant and alkali resistant adhesive sheet 3 is prepared in advance and wrapped and pasted around the outer periphery of the heat insulating material 2.

In this example, the thickness is 100 ttrn. Polyester film 4 is used as the core, and silicone material is used on the surface to make it 300 pm thick, weatherproof, flame retardant, corrosion resistant, moisture impermeable, water resistant, strong wind resistant, cold resistant, vibration resistant, acid resistant, alkali resistant. In addition to coating 5, a flame retardant adhesive layer 6 with a thickness of 500 μm is provided on the back surface using a glutyl rubber material. 7 is release paper.

The coating 5 in this example was constructed as follows.

The main ingredient is RTV (room temperature curable) silicone rubber (trade name: Sealant 701) manufactured by Shin-Etsu Chemical Co., Ltd., and for 100 parts by weight of RTV, 2 to 75 parts by weight of silica powder, 0 to 25 parts by weight of titanium oxide powder, and water. Aluminum oxide: 3
0 to 100 parts by weight are added to prepare a mixed material dissolved in toluene, and the RTV silicone rubber curing agent is mixed therein and applied. The coating 5 thus constructed has rubber-like elasticity when cured, has excellent water impermeability, good weather resistance, is particularly resistant to ultraviolet rays, can withstand outdoor exposure, is water resistant, and has corrosion resistance. Because it is flame retardant, it is suitable as an exterior insulation material. The mixed material having the above composition can be used in combination with a primer to obtain good adhesion to a glass film or glass, so there is no risk of peeling of the film. Therefore, the above mixed material can also be used as an adhesive as described below.

The properties of the coating 5 made of silicone resin constructed as described above are as shown in the following table.

(Note 1) Continuous durability temperature measurement was performed by making the silicone resin notebook with two thicknesses and holding it at 150'C for 30 days. After about a week, the tensile strength was 15 Ky/am2 and the elongation was 200%, and then We confirmed that this value does not change until the test is finished.

When the above two-thickness silicone resin sheet was exposed outdoors and the weather resistance was tested by measuring changes in tensile strength and elongation, it was confirmed that it had sufficient weather resistance as shown in the table below. Ta.

The chemical resistance of the silicone coating 5 is as shown in the following table.

Gasoline, light oil, kerosene, and heavy oil A are applied to the surface of the silicone coating 5 at a rate of 0.5 Ky/m, respectively.
2 was applied and left in the air to examine changes in appearance.
No change was observed in any of the oils, and it was confirmed that they had sufficient oil resistance.

The silicone resin coating 5 and the butyl rubber adhesive which constitute the weather-resistant, combustible, corrosion-resistant, moisture-impermeable, water-resistant, strong wind-resistant, cold-resistant, vibration-resistant, acid-resistant, and alkali-resistant adhesive sheet explained in FIG. Layer 6 has flame retardancy that meets the standards of Fire Safety No. 57. Saturated polyester film 1, 4 has a thickness of 10,011 m even without combustibility treatment on bamboo, and both sides are sandwiched in a sandwich-like manner with an older combustible material several times as thick. Example: Flame retardant, corrosion resistant, moisture impermeable, water resistant, strong wind resistant, cold resistant, vibration resistant, acid resistant, alkali resistant adhesive sheet 3 as a whole passes the flammability standard test.

In addition, the plastic adhesive layer 6 in this example is as follows:
Butyl rubber 10~5oaH<H parts, asphalt 10~
500 parts by weight, 50-300 parts by weight of polybutene, 100-400 parts by weight of aluminum hydroxide, 0-200 parts of red phosphorus
It is a material made by kneading 0 to 100 parts by weight of lucium carbonate in a pressure kneader or the like and forming it into a sheet, and has properties such as water resistance, waterproofing, water-stopping properties, and combustibility.

A comparison of the peel strengths of the above-mentioned adhesive sheets and commercially available adhesive tapes against foam polystyrene is as follows.

Adhesive sheet of this example...580-600
9Kimon W Sellotape (Trade name piece...80-90
〃 is mutezo ・・・・・・・・・・・・・・・23
0~300〃Aluminum Teso・・・・・・・・・・・・・
・・330～340〃Corrosion-proof tape ・・・・・・・・・
・・・・・・A weather-resistant, combustible, corrosion-resistant, moisture-impermeable, water-resistant, strong wind-resistant, cold-resistant, vibration-resistant, acid-resistant, and alkali-resistant adhesive sheet 3 having a thickness of 140 to 200 n or more is attached to the outer periphery of the heat insulating material 2. When wrapping and pasting the adhesive, it is convenient because the adhesive can be attached simply by peeling off the release paper 7, wrapping it, and pressing it with the palm of the hand, making it easy and safe to work at heights or in narrow spaces. and has high work efficiency.

In this example, the above-mentioned weather resistance, flammability, corrosion resistance,
A moisture-impermeable, water-resistant, strong wind-resistant, cold-resistant, vibration-resistant, acid-resistant, and alkali-resistant adhesive sheet 3 is formed to have a width of 500 cm, and is wrapped and pasted around the outer periphery of the heat insulating material 2 at a pitch of 50 cm. As a result, a joint 8 parallel to the axial center of the water pipe 1 and a circular joint 9 perpendicular to the coaxial center are formed in the above-mentioned adhesive tape 3.

The seams 8 and 9 are coated with the silicone resin and sealed with a glass cloth tape 1o interposed therebetween. In this example, Unitika You Mgura, 7. FJCM 100-505EA (trade name) was adhered with silicone resin. The main specifications of the above Unitika UEM Glass ECM 1.00-508EA t7) are as follows.

Thickness: 0.13mπ density
Strength: 19 x 19 pieces/25 mm Tensile: 9 Strength: 55 Kp/25 The silicone resin for adhering the above Lascross tape is the same as the mixed material used to construct Coding 5 above. In this way, the silicone resin that is the object to be adhered and the silicone resin that is the adhesive have the same composition, so they are integrated without creating a boundary, creating an exterior with an integrated structure reinforced with glass fiber. .

When constructed as shown below, a heat insulating coating structure as shown in Figure 1 will be constructed, with weather resistance, flammability resistance, width resistance, moisture resistance, water resistance, strong wind resistance, cold resistance, vibration resistance, acid resistance, and resistance. The alkaline adhesive sheet 3 and the glass cloth tape 10 form a flexible, tubular, multi-layered exterior body. Since this tubular exterior body is flexible, it can adapt to the shaking and vibrations of the water pipe 1, and because it is a heavy structure, construction is easy and labor costs are low.

Moreover, since metal materials are used, there is no risk of corrosive wear such as salt damage. Moreover, the silicone resin coating 5 has excellent weather resistance, and is particularly resistant to ultraviolet rays, so that excellent durability can be obtained. However, the fire's spread can be stopped because the exterior material is flame retardant.

As mentioned above, the silicone resin coating 5 has excellent waterproof performance (moisture permeability 27 f/m2・Day % at
However, if the saturated polyester film 4 is sandwiched in a sandwich-like manner as in this example, the waterproof performance is further improved. Saturated polyester film also has good adhesion to butyl rubber materials, making it suitable for weather-resistant, flame-retardant, corrosion-resistant, impermeable, water-resistant, strong wind, cold-resistant, vibration-resistant, acid-resistant, and alkali-resistant adhesive sheets. Suitable as a constituent base film. This saturated preester film has a degree of ~23 Kf/WIm2, and is a composite material with coating 5 and adhesive r@6 formed on both sides of the film, which is weather resistant, flame retardant, corrosion resistant, moisture impermeable, water resistant, and strong wind resistant.・4 Cold/vibration resistant/acid/alkali resistant Adhesive sheet 3's overall adhesion properties are as shown in the table below.

A shock resistance test was carried out by dropping a steel ball 13 (B') from a height of 2 m under the same conditions as when the adhesive sheet 3 having the characteristics described above was attached to the heat insulating material 2. 50
A pinhole test with 00 V applied confirmed that no re-ranking occurred. As described above, the exterior constructed by the coating method of the present invention has a single-layer structure, and has sufficient waterproof and moisture-proof functions and a protection function from external mechanical forces.

As described in detail above, the method for heat-insulating coating of piping of the present invention c.
One side of the core material, which is based on glass film, is coated with rubber-elastic weather-resistant, flame-retardant, corrosion-resistant, moisture-proof, water-resistant, strong wind-resistant, cold-resistant, vibration-resistant, acid-resistant, and alkali-resistant coating. Prepare in advance an adhesive sheet with a flame-retardant adhesive layer having rubber elasticity formed on the other side and a release paper pasted on the surface of the adhesive layer, and prepare the release paper for the adhesive sheet. The wrapping is pasted on the outer periphery of the insulation material wrapped around the piping, and the seams of the adhesive note are sealed with the coating described above with glass cloth tape interposed, thereby preventing the piping from bending and strong winds. Weatherproof, flame retardant, and vibration resistant
It is possible to easily construct a seamless exterior that is corrosion resistant, moisture impermeable, water resistant, strong wind resistant, cold resistant, vibration resistant, acid resistant, and alkali resistant.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of the remains of a water pipe's heat insulating groove constructed in one embodiment of the piping heat insulating covering method of the present invention, and Fig. 2 is a perspective view depicting the weatherproof groove used in the above embodiment.・This is a cross-sectional view of flame retardant, corrosion resistant, moisture impermeable, water resistant, strong wind resistant, cold resistant, vibration resistant, acid resistant, alkali resistant adhesive sort. l...Water pipe, 2...Insulating material, 3...Weather resistance/flame retardant/
Corrosion resistant, moisture impermeable, water resistant, strong wind resistant, cold resistant, photographic resistant, acid resistant, alkali resistant adhesive sorting, 4... Saturated polyester film used as a base for plus boot film, 5
Coating, 6 Adhesive layer, 7 Release paper, 8, 9 Seam, 10 Glass cloth tape.

Claims (1)

[Claims] A weatherproof, flame retardant, corrosion resistant, moisture impermeable, water resistant, strong wind resistant, cold resistant, vibration resistant, acid resistant and alkali resistant coating with rubber elasticity is applied to one side of the core material based on Gelastec film. Prepare an adhesive sheet in advance with a flame-retardant adhesive layer having rubber elasticity formed on the other side and a release paper pasted on the surface of the adhesive layer, peel off the release paper of the adhesive sheet, and then pipe the pipe. The adhesive sheet is wrapped around the outer periphery of the heat insulating material, and the seam of the adhesive sheet is sealed with the above-mentioned coating, with a glass crossbeam interposed between them, making it weather resistant and difficult to adapt to the vibrations and bending of the piping. A method of insulation coating for piping, which is characterized by forming a seamless insulation coating that is resistant to fire, corrosion, moisture, water, strong winds, cold, vibration, acid, and alkali.