JP3470810B2 - Insulation for canopies - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material for a canopy which is useful as a heat insulating material for a storage tank for volatile or flammable dangerous substances such as crude oil.

[0002]

2. Description of the Related Art Conventionally, a volatile or flammable dangerous substance storage tank such as crude oil has been heat-insulated for the purpose of keeping heat. For example, JP-A-51-29711
In the gazette, the floating canopy of a large tank that stores crude oil is
It is described that heat insulation is performed with a heat insulating plate formed of a synthetic resin in which inorganic fibers such as glass wool and rock wool are impregnated with a silicone resin to give water repellency and laminated with a layered fiber material.

[0003]

However, this type of conventional heat insulating material in which a fiber material and a synthetic resin heat insulating material are laminated is very apt to be charged with static electricity, and when a worker walks on it, the human body is electrically charged. Or, in some cases, an electrostatic potential difference may occur between the human body and the metal part of the tank until a spark discharge is generated, so that the contents stored in the tank are volatile or flammable dangerous substances. In this case, there was a risk of fire or explosion due to this spark discharge.

The present invention has been made in view of the above circumstances.
An object of the present invention is to provide a heat insulating material for a canopy, which has surface incombustibility, has no ignitability, is imparted with antistatic properties, and has good water repellency and heat retention, and is excellent in on-site workability.

[0005]

In order to achieve the above object, the present invention provides a heat resistant nonflammable sheet comprising a nonflammable fibrous sheet and a cured layer of a silicone resin coating containing a conductive substance dispersed on one surface thereof. A heat insulating material for a canopy, characterized in that the hardened layer is laminated on the surface of a synthetic resin foam so that the hardened layer is located on the outside, and the hardened layer is disposed on the canopy of the tank so that the hardened layer becomes the surface. In particular, the hardened layer has a surface specific resistance of 10 ⁷ Ω or less and an electrostatic charging voltage of 4000 V.
It is more preferable that it is below and the half-life is 5 seconds or less.

[0006]

The heat insulating material for a canopy of the present invention comprises a heat resistant and non-combustible sheet laminated on the surface of a synthetic resin foam to protect the surface of the synthetic resin foam. The heat resistant and non-combustible sheet is a non-combustible fibrous sheet. A cured layer of a silicone resin paint containing a conductive substance dispersed therein is formed on one surface (surface) of the heat insulating and non-combustible sheet of the present invention on a tank canopy so that the cured layer becomes the surface. Therefore, the surface is nonflammable, has no ignitability, and the surface has appropriate conductivity, and thus exhibits an excellent antistatic effect. Therefore, even if the worker walks on this canopy insulation material (on the hardened layer of the heat-resistant and incombustible sheet), it is not charged, and between the human body and the metal part such as the tank of the canopy where this insulation material is installed. Workers can safely work on this canopy insulation without the inconvenience of spark discharge.

Further, the heat insulating material for a canopy of the present invention has water repellency since the surface thereof is formed by the cured layer of the silicone resin coating material. Furthermore, since the inner layer is made of synthetic resin foam, it has a small thermal conductivity and excellent heat retention. Moreover, since the heat insulating material for a canopy of the present invention is formed by laminating the heat-resistant and non-combustible sheet and the synthetic resin foam, it is easy to perform cutting work on site and is excellent in workability on site. Therefore, the heat insulating material for a canopy of the present invention is suitably used for heat insulating construction of a hazardous material tank or the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1. Reference numeral 1 in FIG. 1 is a heat-resistant and non-combustible sheet. It is formed by forming a cured layer 3 of a silicone resin paint in which a substance is dispersed. In this case, a part of the cured layer 3 penetrates into the sheet 2 by impregnating the fibrous sheet 2 with the silicone resin paint when the sheet 2 is impregnated. Reference numeral 4 is a synthetic resin foam that forms a heat insulating layer of a heat insulating material, and the heat resistant and non-combustible sheet 1 is laminated on the surface so that the hardened layer 3 is arranged on the surface side (outside).

Here, the non-combustible fibrous sheet 2 is made of woven or non-woven fabric such as glass fiber or carbon fiber. As the silicone resin coating material, a coating material having a known composition can be used, and in particular, a silicone resin mixed with silica or the like as a filler is preferably used. Examples of the conductive substance dispersed and blended in the silicone resin coating include conductive carbon powder such as acetylene black, Ketjen black, graphite, conductive carbon fiber, metal powder, metal fiber, conductive metal oxide and the like. To be The blending amount is appropriately selected, but the surface specific resistance value of the hardened layer 3 is 10 ⁷
Ω or less, electrostatic charging voltage of 4000 V or less, and half-life of 5 seconds or less are preferably selected.

The hardened layer 3 of the conductive material-containing silicone resin coating material is formed by applying the coating material on one surface of the fibrous sheet 2 and then drying and baking it. In this case, drying and baking can be performed according to a conventional method.

On the other hand, the synthetic resin foam 4 has a closed cell structure, and examples thereof include polyethylene foam, polypropylene foam, polystyrene foam and polyurethane foam.

As a means for laminating the heat-resistant and non-combustible sheet 1 on the surface of the synthetic resin foam 4, a frame method or the like is adopted, but of course the invention is not limited to this. The heat insulating material for a canopy of the present invention is obtained by laminating the heat-resistant and non-combustible sheet 1 on the surface of a synthetic resin foam 4 and mounting it on the floating canopy of a large tank for stocking crude oil so that the hardened layer 3 becomes the surface. , Which is to be insulated.

Next, the effect of the heat insulating material for a canopy of the present invention will be specifically described with reference to experimental examples.

[Experimental Example] No. 1 in Table 1 in which graphite was mixed as a conductive substance on one surface of glass cloth (JIS-R-3414, ET-48 equivalent product). A silicone resin coating composition having the composition shown in 1 was applied at a rate of 160 g / m ² and dried and baked at 230 ° C. for 5 minutes to obtain a heat-resistant and non-combustible sheet.

Next, the heat-resistant and non-combustible sheet is laminated on the surface of a flame-retardant polyethylene foam (Furukawa Electric Co., Ltd., Foam Ace, thickness 15 mm) by the frame method so that the hardened layer of the paint is on the outside, and heat insulation is performed. A material was obtained (invention product No. 1).

In addition, No. 1 containing Ketjen black as a conductive substance was used. A heat insulating material was obtained in the same manner as above except that the silicone resin coating composition of 2 was used (invention product N
o. 2).

Further, as a comparative product, No. 1 containing no conductive substance was used. A heat insulating material was obtained in the same manner as described above except that the silicone resin paint of 3 was used (comparative product).

Next, the ignitability, surface resistivity and chargeability of these heat insulating materials were evaluated by the following methods. The results are shown in Table 1.
Shown in.

Test method (1) Ignition property A sample of a predetermined width was suspended vertically, and a flame length of 10
The LPG torch burner adjusted to cm was applied for 60 seconds, and the ignition state of the sample was visually observed. (2) Surface resistivity A voltage of 50 V was applied to the surface of the hardened layer of the sample using a super insulation resistance meter (manufactured by Yokogawa Hewlett-Packard Co.), and the surface resistance was examined. (3) Chargeability, half-life The surface of the cured layer of the sample was rubbed 10 times with a rubber shoe sole, and the potential was measured with an electrostatic dielectric electrometer (Statileon M manufactured by Shishido Shokai).

[0020]

[Table 1]

[0021]

The heat insulating material for a canopy of the present invention has a nonflammable surface, has no ignitability, has a high antistatic effect, and prevents the accumulation of static electricity. Furthermore, it has surface water repellency,
It has good heat retention properties, is easy to cut on-site, has excellent workability, and is suitable for heat insulation work for dangerous goods tanks.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1 Heat-resistant and non-combustible sheet 2 Non-combustible fibrous sheet 3 hardened layer 4 synthetic resin foam

Continuation of the front page (56) Reference JP-A-63-25031 (JP, A) JP-A-56-131178 (JP, A) Actual opening 61-30688 (JP, U) Actual opening 56-72785 (JP , U) Japanese Patent Publication No. 42-24480 (JP, B1) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B65D 88/00-90/66 F17B 1/00 F17C 3/02-3 / 04,13 / 06

Claims (2)

(57) [Claims] 1. A surface of a synthetic resin foam comprising a heat-resistant non-combustible sheet having a cured layer of a silicone resin coating material containing a conductive substance dispersed on at least one surface of a non-combustible fibrous sheet so that the cured layer is located outside. A heat insulating material for a canopy, which is laminated on the canopy of the tank so that the above-mentioned hardened layer becomes the surface. 2. The hardened layer has a surface specific resistance value of 10 ⁷ Ω.
The heat insulating material for a canopy according to claim 1, which has an electrostatic charging voltage of 4000 V or less and a half-life of 5 seconds or less.