JP2020200894A - Heat insulating member and manufacturing method for heat insulating member - Google Patents

Abstract

To provide a heat insulating member having a rustproof function for a fluid piping facility through which fluid of relatively low temperature circulates.SOLUTION: A heat insulating member 1 provided with a heat insulating layer 3 made of an independent foamed resin that covers the outside of a metal fluid piping facility 2, is provided with an anchor layer having an uneven surface, in which at least one anchor layer forming material 4 selected from a glass fiber cloth, a chemical fiber cloth, a mineral fiber cloth, a natural fiber cloth and a porous resin layer is integrally attached to the inner surface of the heat insulating layer 3, wherein a rust preventive paint with water added to a rust preventive agent containing hydrocalumite and calcium phosphate as main components is applied on the anchor layer to form a rust preventive layer 5.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat insulating member provided with a heat insulating layer made of an independent foamed resin covering the outside of a metal fluid piping facility, and a method for manufacturing the same.

Conventionally, in the heat insulating member covering the outside of a metal fluid piping facility, for example, an independent foamed resin having a low melting point is used to keep the fluid piping facility warm at a relatively low temperature of about 100 ° C. or lower. Those consisting of are generally adopted.
In addition, the heat insulating member itself did not take any rust preventive measures especially for the fluid piping equipment.
Therefore, in general, rust preventive paints such as valve handle paints and zinc-containing paints are directly applied to metal fluid piping equipment to prevent rust on metal parts.
However, the valve pattern paint cannot exhibit the desired rust preventive function, and in the presence of salt, zinc consumption becomes particularly remarkable in the zinc-containing paint, and the desired rust preventive function is maintained for a long period of time. There was a problem that it could not be maintained over.
Therefore, the applicants first applied a rust preventive containing hydrocarbimite, calcium phosphite, and water glass to the heat insulating member mainly composed of calcium silicate heat insulating material on the side in contact with the fluid piping equipment. It was proposed to apply it to the surface of Calcium (see, for example, Patent Document 1).

Japanese Patent No. 4201733

The proposed invention described above is effective for a heat insulating member for a fluid piping facility for a high temperature fluid having an internal fluid temperature of the ambient temperature or higher, but is not suitable for a fluid piping facility for a relatively low temperature fluid having an internal fluid temperature of the ambient temperature or lower.
In other words, in fluid piping equipment that allows fluids below the ambient temperature to flow, the vicinity of the fluid piping equipment cooled in summer or the like becomes negative pressure and sucks moisture in the outside air, especially on the metal surface due to changes in the temperature of the fluid. Condensation water may occur in the water.
The generated dew condensation water tends to cause corrosion, and the calcium silicate heat insulating material easily absorbs the dew condensation water, and even if there is a water-repellent layer, it easily deteriorates, and the rust preventive agent easily elutes. There is a problem.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a heat insulating member having a rust preventive function for a fluid piping facility through which a relatively low temperature fluid flows.

The characteristic configuration of the first heat insulating member of the present invention is a heat insulating member provided with a heat insulating layer made of an independent foamed resin that covers the outside of a metal fluid piping facility, and has surface irregularities on the inner surface side of the heat insulating layer. An anchor layer is provided, and a rust preventive paint is applied to the anchor layer to form a rust preventive agent layer.

According to the first characteristic configuration of the present invention, since the heat insulating layer made of an independent foamed resin has low water absorption, dew condensation water is generally present in a fluid piping facility through which a relatively low temperature fluid flows. Even if it occurs, the heat insulating performance is not deteriorated and it is suitable as a heat insulating material, but it is difficult for the rust preventive paint to adhere to the surface thereof, and it is usually difficult for the heat insulating layer to have a rust preventive function.
However, the rust preventive is stable because the anchor layer having uneven surface is provided on the inner surface side of the heat insulating layer and the rust preventive paint is applied to the anchor layer to form the rust preventive layer. It is fixed to the anchor layer, and therefore, the rust preventive function of the rust preventive layer can be exhibited for a long period of time.

The second characteristic structure of the present invention is that the anchor layer is made of at least one anchor layer forming material selected from glass fiber cloth, chemical fiber cloth, mineral fiber cloth, natural fiber cloth, and porous resin layer. It is located integrally attached to the inner surface of the heat insulating layer.

According to the second characteristic composition of the present invention, in addition to being able to realize the above-mentioned action and effect by the first characteristic composition of the present invention, glass fiber cloth, chemical fiber cloth, mineral fiber cloth, natural fiber cloth By integrally attaching at least one anchor layer forming material selected from the porous resin layers to the inner surface of the heat insulating material to form the anchor layer, even if the heat insulating layer is made of an independent foam resin, the inner surface thereof. On the side, the rust preventive coating is physically or chemically fixed to the innumerable fibers of each exposed cloth and the numerous uneven surfaces of the porous resin layer, and the rust preventive agent layer can be maintained for a long period of time.

The third characteristic configuration of the present invention is that the rust preventive paint is obtained by adding water to a rust preventive agent containing hydrocarbimite and calcium phosphate as main components.

According to the third characteristic configuration of the present invention, the hydrocalmite of the rust preventive paint exerts a desired rust preventive function for a relatively long time even in the presence of salt, and suppresses corrosion of the metal heat insulating body. In addition, the pH of calcium phosphite is set to 10 or more, and in particular, an iron-made heat-insulated body can be easily brought to the rust-preventive region to exert a reliable corrosion suppressing effect.

The fourth characteristic configuration of the present invention is that the hydrocalmite is a nitrite-type hydrocalmite, and the surface of the rust preventive layer is coated with a cover layer containing water glass as a main component. is there.

According to the fourth characteristic configuration of the present invention, when the aqueous solution of water glass is applied to the surface of the rust preventive layer, the cover layer is impregnated with the surface of the rust preventive layer to form the cover layer. By coating the rust preventive layer containing nitrate hydrocarbimite and calcium phosphite as the main components with the cover layer containing water glass as the main component, nitrite hydrocarbamite and calcium phosphite can be removed from the rust preventive layer. The cover layer prevents it from coming off, and the cover layer containing water glass as the main component can exert the rust preventive function of the rust preventive layer in order to allow the permeation of condensed water, and for a long period of time. The function of the rust preventive layer is maintained.

The characteristic configuration of the fifth heat insulating member manufacturing method of the present invention is that the anchor layer forming material is placed inside the molding mold of the heat insulating layer, the unfoamed resin is filled, and then the unfoamed resin is foamed. At the same time as forming the heat insulating layer, the heat insulating layer and one surface of the anchor layer forming material are integrated, and the rust preventive paint is applied to the surface of the other side of the anchor layer forming material. The point is that the rust preventive layer is formed, and then an aqueous solution of water glass is applied to the surface of the rust preventive layer to form the cover layer.

According to the fifth characteristic configuration of the present invention, the anchor layer forming material is placed inside the molding mold of the heat insulating layer, the unfoamed resin is filled, and then the unfoamed resin is foamed to insulate the heat insulating layer. By forming the layer and at the same time integrating the heat insulating layer and one surface of the anchor layer forming material, not only the heat insulating material layer and the anchor layer forming material can be firmly integrated. The anchor layer forming material arranged inside the molding mold facilitates the release of the heat insulating material layer in which the unfoamed resin is foamed from the molding mold, and the prevention on the other side surface of the anchor layer forming material. By applying a rust paint to form the rust preventive layer, and then applying an aqueous solution of water glass to the surface of the rust preventive layer to form the cover layer, the rust preventive layer is formed by the cover layer. It protects strongly and prevents the rust preventive from coming off, and can maintain the rust preventive function for a long period of time.

The characteristic configuration of the method for producing the sixth heat insulating member of the present invention is that after filling the molding mold of the heat insulating layer with an unfoamed resin, the unfoamed resin is foamed to form the heat insulating layer, and then the heat insulating layer is formed. The anchor layer forming material is adhered to the inner side surface of the layer with an adhesive to integrally form the anchor layer, and the rust preventive paint is applied to the inner side surface of the anchor layer to form the rust preventive agent layer. The purpose is to apply an aqueous solution of water glass to the surface of the rust preventive layer to form the cover layer.

According to the sixth characteristic configuration of the present invention, after foaming an unfoamed resin to form the heat insulating layer, the anchor layer forming material is adhered to the inner surface of the heat insulating layer with an adhesive to form the anchor layer. By integrally forming the anchor layer, the anchor layer forming material is integrally formed with the heat insulating layer by spraying a large number of fibers together with an adhesive on the inner surface of the heat insulating layer in addition to the preformed cloth or mat-like material. You can also let it.
Further, the rust preventive paint is applied to the inner surface of the anchor layer to form the rust preventive agent layer, and then an aqueous solution of water glass is applied to the surface of the rust preventive agent layer to form the cover layer. As a result, the rust preventive layer can be firmly protected by the cover layer to prevent the rust preventive from coming off, and the rust preventive function can be maintained for a long period of time.

It is an exploded perspective view which shows the process of attaching the heat insulating member of this invention to a pipe. (A) is a cross-sectional view before filling the molding die with the unfoamed resin, and (b) is an exploded cross-sectional view showing after the filled foamed resin is foamed and after mold release.

Hereinafter, a heat insulating member of the present invention and an embodiment of the manufacturing method thereof will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the heat insulating member 1 is provided with a heat insulating layer 3 made of an independent foam resin that covers the outside of a fluid piping facility 2 such as a metal pipe or valve or a fluid storage tank. The anchor layer forming material 4 made of glass cloth is integrally attached to the inner surface of the heat insulating layer 3 made of independently foamed polyurethane resin to form an anchor layer made of the anchor layer forming material 4 inside the heat insulating layer 3. The rust preventive layer 5 is formed by applying a rust preventive paint obtained by adding water to a rust preventive agent containing hydrocalmite and calcium phosphite as main components on an anchor layer having an uneven surface.

The heat insulating member 1 is a molded product having a cross-sectional shape of approximately half a cylindrical body so as to match the shape of the outer surface of the pipe of FIG. 1, for example, of the fluid piping facility 2 for passing a fluid of about 100 ° C. or lower. It is composed of.
The rust preventive paint is formed of nitrite type hydrocarbimite (10 to 70%), calcium nitrite (90 to 30%), and water (150% as a guide).
The nitrite-type hydrocarmite can exert the desired rust preventive function for a relatively long time even in the presence of salt, and due to the presence of calcium phosphite, iron when the metal heat insulating material is made of iron. Considering that the passivation pH of is 10 or more, calcium phosphite having a pH of 10 or more can easily bring iron to the rust preventive region and exert a reliable corrosion suppressing effect.
Further, the surface of the rust preventive layer 5 is coated with a cover layer containing water glass as a main component.
Examples of the water glass forming the cover layer include water-soluble silicates, modified water-soluble silicates, alkyl silicates, alkoxy silicates, coupling agents, colloidal silica and the like.
The water glass has better permeability of condensed water than, for example, forming a cover layer with a synthetic resin material, and therefore, the rust preventive function of the rust preventive agent layer 5 can be exhibited well.

[Manufacturing method of heat insulating member]
As shown in FIGS. 2A and 2B, the unfoamed resin is applied in a state where the anchor layer forming material 4 is arranged inside the molding dies 6 and 7 of the heat insulating layer 3 (FIG. 2A). After filling, the unfoamed resin is foamed to form the heat insulating layer 3, and at the same time, the heat insulating layer 3 and one surface of the anchor layer forming material 4 are integrated (FIG. 2B), and the anchor layer is formed. A rust preventive paint is applied to the surface of the other side of the forming material 4 to form the rust preventive agent layer 5, and then an aqueous solution of water glass is applied to the surface of the rust preventive agent layer 5 to form a cover layer.
That is, for example, a solution in which water glass is added to the rust preventive paint in advance can be applied to the surface of the other side of the anchor layer forming material 4, and those components can be integrally fixed to the anchor layer, but rust preventive. By forming the cover layer after the formation of the agent layer 5, the supply line of the rust preventive paint and the supply line of the water glass aqueous solution can be formed separately on the production line, so that the rust preventive paint is cured in the middle of the supply path. It is possible to prevent the supply from becoming impossible.

[Example 1]
An example of the composition and ratio of the rust preventive paint is a mixture of 40 kg of a rust preventive pigment containing 30% nitrite hydrocarbamite and 70% calcium phosphite and 60 kg of water, and the rust preventive paint is used. The rust preventive layer 5 is formed by applying 500 g / m ² to the inner surface side (piping side) of the heat insulating layer 3.
Then, a mixture of 50 g of water glass and 50 g of water is applied to the surface of the rust preventive layer 5 at 100 g / m ² to form a cover layer.

[Another Embodiment]
Other embodiments will be described below.
<1> In addition to the glass fiber cloth, the anchor layer may be at least one kind of anchor layer forming material 4 selected from a chemical fiber cloth, a mineral fiber cloth, a natural fiber cloth, and a porous resin layer. ..
<2> an aqueous solution of water glass for forming the cover layer may be applied in the range of 50 to 200 g / m ² in addition to be applied to the surface of the rust preventive layer 5 at 100 g / m ^2.
<3> In addition to applying the water glass to the surface of the rust preventive layer 5, the water glass may be mixed in advance with the rust preventive paint and applied to the inner surface side of the heat insulating layer 3. As described above, when the water glass aqueous solution is separately applied to the surface of the rust preventive agent layer 5 after the rust preventive paint is applied, the rust preventive paint supply path and the water glass supply path are separated, and the supply path It is possible to prevent the water glass from hardening inside, and it becomes easy to manage the equipment on the production line.
<4> The heat insulating layer 3 may be a foamed resin such as expanded polystyrene or expanded polyethylene instead of the expanded polyurethane.
<5> The heat insulating member 1 that covers the outer surface of the pipe may be a molded product having a cross-sectional shape of a substantially half-divided cylinder, or a molded product having three or more divisions.
<6> The anchor layer may be integrated by adhering the anchor layer forming material 4 to the inner surface of the heat insulating layer 3 after foam molding via an adhesive, or by welding and integrating with a solvent or heating. In this case, the anchor layer forming material 4 is formed by spraying a large number of fibers together with an adhesive on the inner side surface of the heat insulating layer 3 in addition to the cloth or mat-like material formed in advance to integrally form the anchor layer with the heat insulating layer 3. You can also do it.
<7> The fluid piping equipment 2 itself may be directly coated with a rust preventive agent such as a valve handle paint or a zinc-containing paint, as in the conventional case.

As described above, although the reference numerals are given for convenience of comparison with the drawings, the present invention is not limited to the configuration of the attached drawings. In addition, it goes without saying that it can be carried out in various aspects without departing from the gist of the present invention.

1 Insulation member 2 Fluid piping equipment 3 Insulation layer 4 Anchor layer forming material 5 Rust preventive layer

Claims (6)

A heat insulating member provided with a heat insulating layer made of an independent foamed resin that covers the outside of a metal fluid piping facility.
An anchor layer with uneven surface is provided on the inner surface side of the heat insulating layer.
A heat insulating member in which a rust preventive paint is applied to the anchor layer to form a rust preventive agent layer. For the anchor layer, at least one anchor layer forming material selected from glass fiber cloth, chemical fiber cloth, mineral fiber cloth, natural fiber cloth, and porous resin layer is integrally attached to the inner surface of the heat insulating layer. The heat insulating member according to claim 1, which is one. The heat insulating member according to claim 2, wherein the rust preventive paint is obtained by adding water to a rust preventive agent containing hydrocarbumite and calcium phosphate as main components. The heat insulating member according to claim 3, wherein the hydrocalmite is a nitrite type hydrocarbimite, and the surface of the rust preventive layer is coated with a cover layer containing water glass as a main component. The method for producing a heat insulating member according to claim 4.
With the anchor layer forming material arranged inside the molding mold of the heat insulating layer, after filling with the unfoamed resin, the unfoamed resin is foamed to form the heat insulating layer, and at the same time, the heat insulating layer and the heat insulating layer are formed. The one side surface of the anchor layer forming material is integrated with each other.
The rust preventive paint is applied to the surface of the other side of the anchor layer forming material to form the rust preventive agent layer, and then an aqueous solution of water glass is applied to the surface of the rust preventive agent layer to form the cover layer. Manufacturing method of heat insulating member to be formed. The method for producing a heat insulating member according to claim 4.
After filling the molding mold of the heat insulating layer with an unfoamed resin, the unfoamed resin is foamed to form the heat insulating layer, and then the anchor layer forming material is adhered to the inner surface of the heat insulating layer with an adhesive. To integrally form the anchor layer,
A heat insulating member in which the rust preventive paint is applied to the inner surface of the anchor layer to form the rust preventive agent layer, and then an aqueous solution of water glass is applied to the surface of the rust preventive agent layer to form the cover layer. Manufacturing method.

Images