JP2000297884A - Pipe material with fireproof function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sufficient fireproof function even if a pipe material itself has no fire resistance by forming at least part of a pipe wall in the thickness direction with a thermoplastic resin dispersed with an unreacted foaming agent into a layer shape. SOLUTION: The whole pipe wall 11 of a pipe material 1 is formed with a thermoplastic resin 4 blended with a foaming agent foaming at a temperature higher than the molding temperature of a thermoplastic resin into the thermoplastic resin by extrusion molding. When a fire breaks out, the pipe material 1 is heated to a high temperature by the flames occurring in a left room. When the temperature reaches the foaming temperature of the foaming agent, the unreacted foaming agent in the thermoplastic resin 4 is foamed to form a foamed portion 41. When the foaming agent is foamed, foaming of the pipe material 1 to the outside is interrupted by a hole 21 at the portion of the pipe material 1 inserted into the hole 21 of a structural wall 2, and the foaming agent is formed to the inside of the pipe material 1. The inside of the pipe material 1, i.e., a pipe path, is blocked by the foamed portion 41, the hole 21 is blocked, and the spread of the fire to a right room can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubing mainly composed of a thermoplastic resin and having a fire protection function.

[0002]

2. Description of the Related Art Generally, a building structure must have a predetermined fire resistance. When piping is performed on this building structure, the pipe itself is required to have a fire resistance.

[0003] The fire resistance performance is judged based on the test results of a fire resistance test (JIS A 1304) of a building structure portion, and this test is also performed on a pipe that is connected to a building structure.

[0004] In a fire resistance test (JIS A 1304) of a building structure portion in which a pipe is connected to a building structure, a hole is formed in a wall or a floor made of a nonflammable material such as concrete to allow a pipe material to penetrate. After passing the tube through this hole, in a state backfilled with mortar, when the temperature is raised at a predetermined heating rate in one room of the wall or floor, by providing the tube, the other In the room, after an hour or two hours, for example, it is tested whether or not an abnormality has occurred.

[0005] The abnormal condition here means that the flame moves to the other room through the hole of the structure through which the tube material is penetrated or the tube material fixed to this hole, or the pipe becomes flammable in the other room. Or fuming.

[0006] The fire resistance test (JIS
A 1304), the purpose of which is to determine the fire protection performance of the pipes, so that the walls and floors of the building structures used are those that can withstand this fire test (JIS A 1304) sufficiently. .

[0007] Then, with the pipe material to be piped to the building structure,
As fire-resistant tubing, use non-combustible asbestos tubing for the outer pipe and hard vinyl chloride tubing for the inner pipe,
There is a two-layer pipe in which both pipes are integrally assembled using a string or band made of polypropylene as a spacer.

[0008]

However, this double-layered pipe having fire resistance is very heavy and very vulnerable to impacts since the outer pipe is made of asbestos-made pipe material. In addition, the gap between the asbestos generated at the connection portion must be backfilled with the joint material, so that there is a problem that the workability is very poor.

By the way, as a pipe material which is light, has impact resistance, and has good workability, an inner layer and an outer layer are made of a non-foamed resin layer as described in JP-A-61-103085.
There is a multi-layer pipe with an intermediate layer made of a foamed resin layer.If this multi-layer pipe having impact resistance is piped to a building structure, the multi-layer pipe can obtain sufficient fire resistance performance as a building structure part. Did not.

[0010] The present invention has been made in view of such a problem, and provides sufficient strength during normal use, is light and easy to perform, and can be used even if the pipe itself does not have fire resistance. It is an object of the present invention to provide a tube material having a sufficient fire prevention function.

In addition, as long as a thermoplastic resin is used as the tube material, a test of JIS A 1304 (after 1 hour of heating temperature: 925)
C., after 2 hours: 1010 ° C.), it is impossible that the tubing itself does not burn.
It is intended to propose a tube material in which the flame does not transfer to the opposite room and the piping does not burn or emit smoke in the opposite room.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, at least a part of a tube wall in a thickness direction is made of a thermoplastic resin in which an unreacted blowing agent is dispersed. A tube material having a fire prevention function was obtained by forming a layer.

According to a second aspect of the present invention, in the first aspect of the present invention, the inner wall surface of the tube wall and the vicinity thereof are formed of a thermoplastic resin containing no unreacted blowing agent.

According to a third aspect of the present invention, in the first or second aspect, the outer wall surface of the tube wall and the vicinity thereof are formed of metal.

Here, in the invention described in claim 1,
At least a part of the tube wall in the thickness direction is layered,
The entire tube wall may be composed of a thermoplastic resin in which an unreacted foaming agent is dispersed, or the tube wall is composed of a multilayer including a layer composed of a thermoplastic resin in which an unreacted foaming agent is dispersed. Means you can.

[0016] A tube material having a fire protection function in which at least a part of the tube wall in a thickness direction is formed of a thermoplastic resin in which an unreacted blowing agent is dispersed, specifically, is made of a thermoplastic material. When molding with a resin, for at least a part of the layer in the thickness direction of the tube wall, by mixing a foaming agent that foams at a temperature higher than the molding temperature of the resin in the thermoplastic resin to produce a tube material. can get.

The thermoplastic resin constituting the tube is not particularly limited as long as it can be extruded.
Polyvinyl chloride, polyethylene, cross-linked polyethylene, polyphenylene sulfide, polypropylene, polybutene, and the like can be used.

The foaming agent is blended and dispersed in the thermoplastic resin. The foaming agent used in the present invention needs to be foamed only in the event of a fire, and therefore, of the chemical foaming agents, it is necessary to carry out thermal decomposition. A type (carbonate, bicarbonate, nitrite, hydrogen compound, azo compound, hydrazine derivative, semicarbazide compound, nitroso compound, triazole compound, etc.) is used.

Specifically, for example, when polyvinyl chloride is used as the resin, the molding temperature is 180 ° C. to 190 ° C.
C., so that azodicarbonamide (decomposition temperature: 195 to 210 ° C.), barium azodicarboxylate (decomposition temperature: 240 to 250)
C), P-toluenesulfonylcarbazide (decomposition temperature:
220-235 ° C), oxalyl hydrazide (decomposition temperature: 230-250 ° C), nitroguanidine (decomposition temperature: 235-240 ° C), hydrazodicarbonamide (decomposition temperature: 240-260 ° C), trihydrazinotriazine ( (Decomposition temperature: 260-270 ° C.).

When the molding temperature of the resin and the decomposition temperature of the foaming agent are close to each other, a completely non-foamed molded product cannot be obtained. However, if the unreacted foaming agent remains, the function of the present invention is not affected at all. It does not affect.

The amount of the foaming agent added to the thermoplastic resin varies depending on the type of the resin and the outer diameter and thickness of the pipe.
Although it cannot be said unconditionally, when the degree of polymerization of polyvinyl chloride is 800 to 1000, the outer diameter of the pipe is 13 mm, and the thickness of the pipe is 2.5 mm, the blowing agent barium azo is used for 100 parts by weight of polyvinyl chloride. The amount of dicarboxylate added is preferably 0.15 to 0.5 parts by weight. The lower the degree of polymerization of polyvinyl chloride, the higher the degree of foaming.

The amount of the foaming agent to be added varies depending on the outer diameter, wall thickness, layer structure, etc. of the pipe, but at least the minimum necessary for crushing the pipe [(tube outer diameter / pipe wall thickness) / 2 ] The amount that causes foaming to be twice or more is required.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

The invention shown in FIGS. 1 and 2 is directed to a first embodiment in which at least a part of the tube wall of the tube material in the thickness direction is formed in a layer of a thermoplastic resin in which an unreacted blowing agent is dispersed. It is an embodiment.

FIG. 1 shows a state in which a pipe 1 is passed through a hole 21 provided in a structural wall 2 made of refractory concrete, the pipe 1 is backfilled with a mortar 3, and the pipe 1 is fixed to the structural wall 2. ing.

In the tube material 1 of the first embodiment, the entire tube wall 11 is made of a thermoplastic resin 4 in which a foaming agent that foams at a temperature higher than the molding temperature of the resin is mixed in the thermoplastic resin. And is manufactured by normal extrusion.

Next, in this embodiment, FIG. 2 shows a state in which the shape of the tube 1 before the fire shown in FIG. 1 has changed due to the fire is shown in FIG. When heated to a high temperature by the flame generated in the room on the left side and reaches a temperature at which the foaming agent foams, the unreacted foaming agent in the thermoplastic resin foams to form a foamed portion 41.

In particular, when the foaming agent is foamed, the portion of the structural wall 2 of the tube 1 inserted into the hole 21 is prevented from foaming toward the outside of the tube by the hole 21, and is directed toward the inside of the tube. Foam. As a result, the inside of the pipe member 1, that is, the pipe line is closed by the foamed portion 41, and the hole 21 formed in the structural wall 2 is closed, thereby preventing the fire from spreading to the room on the right side in FIG. Can be.

As described above, according to the pipe member 1 of the present invention, even if a fire occurs in one room, it is possible to prevent the flame from entering the room on the opposite side and prevent the pipe from emitting smoke in the room on the opposite side. be able to. Here, it should be noted that since the foam is also made of a thermoplastic resin, if it is exposed to a flame near 1000 ° C. for a long time, the flame is completely completely removed to the room on the opposite side. There is a possibility that advancement may not be suppressed.

However, when the thermoplastic resin ignites, carbides are finally generated, and the carbides are filled in the pores of the structural wall. , But can prevent the spread of fire.

The tube material 1 of the present invention is lightweight, has a predetermined strength at room temperature, has good workability, and has a sufficient fire protection function for a building structure.

Next, a second embodiment is shown in FIG. In the second embodiment, the tube wall 11 of the tube material 1 is constituted by two layers, and the inner layer 5 of the tube wall 11 is constituted by a thermoplastic resin containing no unreacted foaming agent, and the outer layer 4 is constituted by an outer layer 4. Is composed of a thermoplastic resin in which an unreacted blowing agent is dispersed.

According to the second embodiment, as in the first embodiment, the outer layer 4 of the tube wall 11 is made of a thermoplastic resin in which an unreacted blowing agent is dispersed, and the inner layer 5 is not formed. Because it is composed of a thermoplastic resin that does not contain a foaming agent for the reaction,
It is lightweight, has a predetermined strength at room temperature, has good workability, and can sufficiently fulfill the fire protection function of the building structure.

Moreover, since the inner layer 5 does not contain an unreacted foaming agent, the fluid flowing inside does not come into contact with the foaming agent. Therefore, it can also be used for applications where there is a problem if the fluid flowing inside the tube material comes into contact with the foaming agent and this foam material seeps into the fluid, for example, for tap water.

FIG. 4 shows a third embodiment.
The tube wall 11 of the tube material 1 is formed of three layers, the inner layer 5 of the tube wall 11 is formed of a thermoplastic resin containing no unreacted foaming agent, and the intermediate layer 4 is formed of unreacted foaming agent. The outer layer 6 is made of a dispersed thermoplastic resin, and the outer layer 6 is made of a metal.

The metal constituting the outer layer 6 is not only steel but also aluminum, stainless steel,
Copper can also be used. By making the outermost layer a metal layer 6, it is possible to have the same effect as if the tube were in the hole 21 of the structural wall 2 over its entire length.

That is, when the foaming agent in the intermediate layer 4 is heated and starts to foam, the foaming agent is prevented from foaming all outward by the outermost metal layer 6,
It can be foamed more inward than the metal layer 6.
As a result, the inside of the tubular material 1 other than the inside of the hole 21 of the structural wall 2 is also closed by the foamed portion, and the portion closed by the foamed portion can be lengthened.
The reliability against fire spread can be further improved.

Further, since the outermost layer 6 of the tube wall 11 of the tube material 1 is made of metal, the flame does not directly touch the thermoplastic resin, so that the resin is not immediately ignited. The time required for the tube material 1 to burn can be made longer than in the case where there is no flame.

As a result, the tubular material 1 is finally
The carbide is generated in the hole 21 of the above, and the spread of fire to the next room is prevented. However, if the outermost layer is the metal layer 6, the time until the carbide is generated in the hole 21 of the structural wall 2 is reduced. It can be lengthened, and the fire resistance performance can be further improved accordingly.

For example, in the case where there is no metal layer, even if the fire resistance is only 2 hours, by forming the metal layer,
Fire resistance performance of 4 hours can be obtained.

When the outermost layer is made of copper and has a small thickness, it cannot withstand a high temperature as high as 1000 ° C., but at least the time required until the state as shown in FIG. 2 of the first embodiment is reached. Becomes longer.

As described above, according to the third embodiment, since the metal layer 6 is formed on the outermost layer, the strength can be further improved, the workability is good, and the fire protection function of the building structure is improved. Can be further improved than the first and second embodiments described above, and since the inner layer 5 of the tube wall 11 is made of a thermoplastic resin containing no unreacted foaming agent, The inner layer 5 prevents the fluid from coming into contact with the foaming agent, and also prevents the fluid flowing inside the tubular member from contacting and reacting with the foaming agent.

In the present invention, the layer made of the thermoplastic resin in which the unreacted foaming agent is dispersed has the same structure as that of the first embodiment in the entire thickness of the tube wall 11. Alternatively, the innermost layer and the outermost layer may be formed of a thermoplastic resin containing no unreacted blowing agent, and the intermediate layer may be formed of a thermoplastic resin in which an unreacted blowing agent is dispersed. Good.

Further, a layer composed of a thermoplastic resin containing no unreacted blowing agent and a layer composed of a thermoplastic resin in which the unreacted blowing agent is dispersed are alternately and repeatedly laminated to form a tube material. May be configured.

When a metal layer is formed as the outermost layer,
In addition to the third embodiment, a two-layer pipe member may be formed in which a layer made of a thermoplastic resin in which an unreacted blowing agent is dispersed is used as an inner layer and a metal layer is used as an outer layer.

[0046]

As described above, according to the first aspect of the present invention, at least a portion of the pipe wall in the thickness direction of the pipe wall is formed in a layered form with a thermoplastic resin in which an unreacted blowing agent is dispersed. In the event of a fire, the unreacted foaming agent in the thermoplastic resin that constitutes the tubing can be foamed with the heat generated at the time of the fire to expand the pipe wall and block the inside of the tubing. The movement of the flame can be prevented.

As a result, it is possible to obtain a sufficient strength at the time of normal use and to easily perform the construction, and to improve the fire prevention function in a building provided with the pipe material even if the pipe material itself does not have fire resistance. it can.

Further, according to the second aspect of the present invention, in the first aspect of the present invention, the inner wall surface of the tube wall and the vicinity thereof are formed of a thermoplastic resin containing no unreacted foaming agent. While it is possible to prevent the fluid flowing in the inside from contacting and reacting with the foaming agent, the fire prevention function can be sufficiently achieved.

Further, according to the third aspect of the present invention, in the first or second aspect of the present invention, since the outer wall surface of the tube wall and the vicinity thereof are formed of metal, the metal portion allows the foaming agent to be formed. The foaming toward the outside of the tubing can be prevented, and all the foaming can be made more inwardly than the metal part. As a result, the portion closed by the foamed portion can be lengthened, so that the reliability against fire spread can be further improved. Further, the metal portion prevents the flame from directly touching the thermoplastic resin and causing the resin to immediately burn, and thus allows a longer time until the tube material ignites than when the outermost layer has no metal portion.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a tube is attached to a structural wall in a first embodiment of a tube having a fire protection function according to the present invention, and shows the tube before a fire occurs. .

FIG. 2 is an explanatory view showing a state in which a tubular member attached to a structural wall has changed its shape due to a foaming agent being foamed due to the occurrence of a fire in the first embodiment.

FIG. 3 is an explanatory view showing a state in which the tube is attached to a structural wall in a second embodiment of the tube having a fire protection function according to the present invention, and shows the tube before a fire occurs. .

FIG. 4 is an explanatory view showing a state in which the tube is attached to a structural wall in the third embodiment of the tube having a fire protection function according to the present invention, and shows the tube before a fire occurs. .

[Explanation of symbols]

 1 tube material 11 tube wall

Claims (3)

[Claims] 1. A tube material having a fire prevention function, characterized in that at least a part of the tube wall in a thickness direction is formed in a layered form from a thermoplastic resin in which an unreacted blowing agent is dispersed. 2. The tube material having a fire protection function according to claim 1, wherein the inner wall surface of the tube wall and the vicinity thereof are formed of a thermoplastic resin containing no unreacted blowing agent. 3. The tube material having a fire protection function according to claim 1, wherein the outer wall surface of the tube wall and the vicinity thereof are formed of metal.