JP2798231B2 - Flexible refractory joints for construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible fire-resistant joint material for building which is formed by mixing a rubber-based flame-retardant material as a main material with chopped carbon fibers, and particularly for a building. The present invention relates to a flexible fire-resistant joint material for construction suitable for use as a fire-resistant gasket on an outer wall having a joint between concrete and concrete.

[0002]

2. Description of the Related Art A laminated construction method in which a wall of a building incorporates a reinforcing bar and is enclosed by a formwork, where concrete is poured and solidified, and is started.
There is a curtain wall method in which steel walls are assembled and aluminum walls, concrete plates, etc. are produced and attached to the factory in accordance with the standard dimensions at the factory, and a gap is created so that the next to the next method does not hit this method. I'm calling The joint width is filled with a joint material made of flexible rubber, sponge, or the like, and the appearance is finished with a sealing material, thereby fulfilling the role of airtightness and watertightness. In recent years, due to the regulations of the Fire Service Law,
In addition to maintaining water tightness, fire prevention and fire resistance are required.
Correspondingly, the conventional joint material (gasket) is, for example, a material such as synthetic rubber, silicon rubber, fluorine rubber, or the like.
A fire-resistant gasket is commercially available in which a powder of iron, aluminum, silver, copper, glass, or the like is mixed to impart flame retardancy to enhance fire resistance.

[0003]

The above-mentioned conventional products mainly have the following problems. That is,

A. Since the mineral powder is mixed, it is difficult to mix uniformly due to the specific gravity.

B. For example, when burning with a burner flame of 1100 ° C to 1200 ° C, the expansion and shrinkage of the length are large toward the heated side, and the burning is ceramicized and the elongated gasket cracks in the horizontal direction, so the middle is granular. The fire will pass to the opposite side in about 20 minutes.

C. Moldability is poor and the incidence of defective products is high.

D. In a building material test center, when conducting a confirmation test of fire resistance for 2 hours, 3 hours, and the like, an experiment is performed in a construction state, that is, a completed state of an outer wall. This is generally referred to as a composite fire resistance test, and a double joint material such as a flame-retardant synthetic rubber or a rain barrier is attached between the outer walls (joints). In this experiment, it is not possible to confirm which is the main material because both have fire resistance.

Accordingly, the present invention provides a flexible fire-resistant joint material for construction having excellent fire resistance of about 2 hours, which does not cause perforation or detachment due to cracks even when the gasket burns and becomes ceramic. It was developed for the purpose of doing so.

[0009]

Means for Solving the Problems The present invention has taken the following technical means to solve the above problems and achieve the object. That is, a simple or composite material of a flexible material such as a synthetic rubber, a silicone rubber, or a fluorine rubber is used in UL.
The base material is a material with flame retardancy of standard V-0,
Then, a long fiber PAN-based carbon fiber having a diameter of 3 to 10 μm is cut into a range of 2 to 20 mm in length, and a weight ratio of 2 to 2 mm.
Mixed at a ratio of 0%, the blowing agent optionally to, vulcanizing agents, stabilizers, was added a required compounding materials such as colorants and kneaded, extruded and the architectural flexibility refractory joint member to the tubular foam It consists of.

[0010]

The present invention configured as described above has the following functions.

The raw material provided with the flame retardancy of the UL standard V-0 is, for example, Shin-Etsu Chemical's [X-30-1545U], which itself has a flame retardancy of about 15 minutes at 1000 ° C to 1200 ° C. There is. To this, a PAN-based carbon fiber, for example, a long fiber (diameter: 3 to 10 μm) of a vesfight chopped fiber C6-P of Toho Rayon Co., Ltd. having a length of 2-2
If cut into 0 mm and mixed, the carbon fibers themselves are flame-retardant and will not be cut even when burned with a flame of 1200 ° C. or more. Therefore, even if the fireproof joint material of the present invention containing this is sandwiched between concrete blocks and burned, when the ceramic material is turned into a ceramic, the internal carbon fiber prevents cracking of the ceramic. Since there is no loss or detachment, even if the outer wall and the gasket burn during a fire, the gasket does not have a puncture hole, thereby preventing a fire from entering the inside.

[0012]

An embodiment of the present invention will be described. First, as a base material, there are generally known synthetic rubbers, silicones, fluororubbers, and the like, and when used, a single substance or several kinds of composites are used. It can be said that the definition of flame retardancy is that even if the heat is high at the time of a fire, no malignant gas is emitted, the flame does not rise, and it takes a long time to burn. Therefore, an additive for preventing generation of vaporized gas is added to the material. These may be newly made, but it is easy to use materials that have already passed the flame retardancy suitability test. Flame retardant silicone rubber (X-3
0-1545U) was used as the main material. This has been confirmed to have the flame retardancy of UL standard V-0. Next, PAN-based carbon fiber (long fiber, 3 to 10 μm in diameter) manufactured by Toho Rayon Co., Ltd. vesfite chopped fiber C
6-P was selected. Since the carbon fiber is a long fiber such as a wire, it is necessary to cut the carbon fiber into a suitable length.
The shredding length is from 2 mm to 20 mm, considering the purpose of preventing cracking, mixing with the main material, and the size of the mold depending on the shape of the product.
The range was set to a range of 3 mm to 12 mm, preferably 8 mm or less to a mixing ratio of about 80%.
When chopping carbon fibers, in a bundled state, when the cutting length is irregular at an irregular interval feed to the cutter,
It is also possible to provide several types of processes for cutting into fixed lengths and to mix cut carbon fibers having different lengths. Furthermore, the cutting length can be changed each time by making the direction of the fiber perpendicular to the plane of the cutter or changing the direction of the fiber to 60 degrees or the like. In this way, a chopped carbon fiber aggregate is produced. Subsequently, the main material is charged into a mixer, and 2% to 40% by weight of the chopped carbon fiber aggregate is added and kneaded. The larger the amount of the carbon fiber mixed, the more the fire resistance and the effect of preventing cracks are improved. However, if the amount is more than 40%, the bondability becomes problematic. Also, as a general additive, a foaming agent, a vulcanizing agent, a stabilizer, a colorant, etc. are appropriately added,
Kneaded for 0 minutes. Introducing the kneaded material in the extruder, in this case using an extrusion molding machine, extruded as shown in FIG. 1, a width of about 36 millimeters, architectural section flattened tubular height of about 24 mm (thickness of about 7 mm) We made use flexibility refractory joint material (architectural gasket). Cut this to 30 cm in length
As shown in FIG. 2, a pair of specimens 2 and 3 were tied together and sandwiched between two concrete blocks 4 and 5 so as to have a spacing of 25 mm. In the center, a gas burner (tip temperature 1100 ° C ~ 120
(0 ° C) 6 was burned close to 10 cm. When the time required for the flame due to this combustion to be seen on the back side of the specimens 2 and 3 was measured, all required 60 minutes or more. When the cracks of specimens 2 and 3 were examined after the completion, as shown in FIG. 3, the back side of the part directly hit by the fire remained in its original shape for about 15 mm, and the part that had been ceramicized was 5 mm.
% Only expanded forward, almost no shrinkage in length, cracks were finely penetrated only in the surface in the vertical direction, and only about 2 mm deep carbide exfoliation was seen The front face directly hit by the flame was ceramicized in white, and there were no defects or cracks. FIG. 3 shows a foamed product (magnification: 4 times) in which the chopped carbon fiber aggregate is mixed at 10%. When the mixing ratio was changed and the experiment was carried out, 15 to 16% was more preferable. Was.
In the case of 2% to 3%, a favorable result was obtained in the case of using no foaming agent. According to this experiment, it was confirmed that there was a fire resistance of 2 hours based on the provisions of Article 107, item 1 of the Building Standard Act.

A gasket for comparison with the product of the present invention was made of a conventional product. The main material is the same, and stone powder, iron, aluminum, copper,
Powders such as glass were mixed individually and variously and added to the main material (3% to 20%), and molding and combustion tests were performed under the same conditions. In each case, the fire resistance was sequentially improved (increased mixing ratio). There was no fire resistant for more than 25 minutes. For example, the test specimen shown in FIG. 4 was a mixture of 15% of stone powder, iron powder and aluminum powder, and a fire was visible on the back side in 25 minutes. As a matter of course, the shrinkage occurred irregularly, and not only cracks but also missing portions occurred, and the state was completely cut in 60 minutes. This is due to the difference in the thermal shrinkage of powders such as stones, iron and aluminum as compared to the rubber-based material of the main material, and the specific gravity of those additives is larger than that of the main material. For this reason, it is difficult to perform uniform mixing at the time of mixing, and the distribution ratio of the additive is different. Therefore, it was confirmed that increasing the mixing amount of the refractory additive also became a negative factor.
Thus, it was confirmed that the product of the present invention had remarkably improved fire resistance when compared with the conventional product.

[0014]

As described above, the present invention has the following excellent effects.

A. In the case of a fire-resistant gasket for building, there is an effect that a surprising fire resistance of 2 hours is obtained without cracks. This is because the foam has low thermal conductivity and therefore is difficult to burn, and the weakness of the foam is reinforced by carbon fibers.

B. The refractory material (carbon fiber) of the present application is superior to the conventionally used mineral refractory material in terms of mixability and moldability, and is uniform because it does not cause non-uniform mixing of carbon fibers and non-uniform foam particles due to foaming. This has the effect of improving the fire resistance time.

C. Since it is a foamed body and a tubular body, it is lightweight, so that even when used in a high-rise building, it has a light weight, a sealing effect, and an effect of reducing transportation costs.

D. Because of excellent mixing and moldability,
The conventional product has a molding loss of 10% or more, but has an effect of improving the profitability of the product because it is improved and the loss is small.

[Brief description of the drawings]

FIG. 1 is a flexible fire-resistant eye for architecture as a building gasket
It is a perspective view of the earth material.

FIG. 2 is a front view showing an example of a combustion test of a flexible refractory joint for building use .

3 is a plan view showing a combustion state of the post-combustion 60 minutes of the present building flexibility refractory joint fillers (architectural gaskets).

FIG. 4 is a plan view showing the state of combustion of a conventional refractory gasket material 25 minutes after combustion.

[Explanation of symbols]

1 building flexibility refractory joint fillers (architectural gaskets) 2,3 combustion experimental trial 4, 5 concrete block 6 gas burner 7 60 minutes present architectural flexibility refractory which is burned
Joint material 8 Refractory material gasket burned for 25 minutes

Claims (2)

(57) [Claims] Claims: 1. A method for cutting long carbon fibers into 20 mm or less,
A chopped carbon fiber aggregate containing around 80% of those of 8 mm or less is used as a flame-retardant composite rubber-based raw material around UL standard VO.
Mix in the range of 40% by weight , add this with the blowing agent if necessary
Adding an additive Te, architectural flexibility refractory joint member, characterized in that the extruded formed form a foam tube by an extrusion forming shape machine the mixture. 2. The mixture ratio of the chopped carbon fibers is 2 to 20.
The flexible fire-resistant joint for architectural use according to claim 1, wherein the foamed material is 4 times expanded in weight%.