JPS6334919B2 - - Google Patents

Description

[Detailed description of the invention]

FIELD OF THE INVENTION The present invention relates to a fire-retardant composition, particularly a putty-like compound having fire-retardant properties. Conventionally, in the case of fires in ships, buildings, etc., despite the presence of bulkheads, electric wires and cables are routed through the bulkheads in multiple groups, and these become combustible materials that can cause damage to the open space. There are many cases where the fire spreads and becomes serious. Various proposals have been made to seal this wall penetrating portion with a sealant made of a fireproof composition. However, such fire-retardant compositions have extremely high fire-retardant properties, adhere well to materials in penetrations, maintain sufficient airtightness, have little shrinkage or deformation, can withstand extensive usage conditions over long periods of time, and can withstand wiring tension. When changing etc.
Something that can be easily dismantled is required. Moreover, it must be easy to fill, that is, it must have appropriate adhesion, be soft to some extent, and be easy to tear off. However, it has not been easy to obtain a fireproofing composition that has both such physical properties and filling workability. An object of the present invention is to provide a new and useful fire protection composition that satisfies these points at the same time. That is, the gist of the present invention is to use 200 to 500 parts by weight of hydrated alumina and 0.5 parts by weight of hydrated alumina to 100 parts by weight of liquid polychloroprene as a fire-retardant putty-like compound.
A composition containing 5 to 40 parts by weight of organic fibers having an average length of 10 mm and 1 to 30 parts by weight of silicone rubber was used. Compounds in this composition range exhibit a high degree of fire retardancy due to the combined effect of hydrated alumina and flame retardant organic fibers. In other words, not only is the binder liquid polychloroprene provided with a high degree of flame retardancy by the hydrated alumina, but even if the polychloroprene is thermally decomposed by heat, the hydrated alumina and flame retardant properties are maintained. Organic fibers form a strong fireproof layer. If the amount of hydrated alumina is less than 200 parts by weight, the fire resistance will decrease, and if it exceeds 500 parts by weight, the filling workability will deteriorate. Furthermore, after the compound is filled into the penetration part, these fibers generate a reinforcing effect similar to that of glass fibers in fiber reinforced resin (FRP), which prevents sagging and deformation. Inorganic fibers, such as glass fibers, carbon fibers, and alumina fibers, have excellent fire resistance and reinforcing properties, but the fibers have high rigidity, which can damage workers' knees and reduce work efficiency. Although asbestos fibers have favorable properties, they are unfavorable in terms of occupational hygiene. Flame-retardant organic fibers include, for example, Kynol (trade name, product of Nippon Kynol Co., Ltd.), Tyentex (trade name, product of Nitto Boseki Co., Ltd.), and natural fibers that have been flame-retardant treated with boric acid metal salts. It must be flexible and compatible with other ingredients, and it must also be carbonized in the event of a fire to become a strong fire-retardant fiber. If the average length of these fibers is less than 0.5 mm, the reinforcing effect will be reduced, and if it exceeds 10 mm, uniform dispersion will be difficult and workability will be poor, so a range of 0.5 to 10 mm is appropriate. The amount thereof is suitably 5 to 40 parts by weight, particularly preferably 10 to 30 parts by weight. As liquid polychloroprene, the viscosity is 20,000~
100000CPS (25℃) is appropriate. If the binder is only liquid polychloroprene, the adhesive will be too strong and will easily stick to hands during installation. However, the addition of silicone rubber provides suitable adhesion. It also easily deforms plastically, making construction work easier. The silicone rubber may be polydimethylsiloxane or methylvinyl silicone. The appropriate amount of silicone rubber to be added is 1 to 30 parts by weight. Less than 1 part by weight has no effect, and more than 30 parts by weight reduces the oil resistance of the compound. Note that there is no problem in adding a plasticizer in an amount of about 1/3 of the amount of liquid polychloroprene. Examples of plasticizers include dioctyl phthalate (DOP), tricresyl phosphate (TCP), phenyl phosphate, and chlorinated paraffin. In addition, other inorganic fillers such as metal borates, silicates, silicon dioxide, calcium carbonate, talc, and clay may be used together with hydrated alumina. Furthermore, flame retardants and flame retardant aids commonly used in plastics, rubber, etc. may also be used. Flame retardants include dechlorane plus, hexabromobenzene, tetrabromobisphenol,
Stable compounds such as decabromodiphenyl ether are preferred, and the effect is further improved when used in combination with antimony trioxide. Furthermore, deterioration inhibitors, softeners, and colorants may be added. Examples of the present invention will be described below. Examples of the fire protection composition of the present invention are shown in Table 1 along with comparative examples.

【table】

[Table] Fire resistance: length 200mm, conductor diameter 40mm, finished outer diameter
The compounds of each example and comparative example were applied to a 68 mm vinyl insulated wire to a thickness of 20 to 25 mm. Hold this horizontally and use a propane gas burner in the center with an oxidizing flame length of 130 mm and a reducing flame length of 60 mm, apply the tip of the reducing flame to the sample, and burn it for 60 seconds. Find the fire spread time when the burner flame is removed. Fire resistance: As shown in Figure 1, conduit C with a length of 100 mm and an outer diameter of 70 mm has an outer diameter of 20 mm and a length of 300 mm.
Insert three vinyl-insulated vinyl-sheathed electric wires A, and pack compound K of each example and comparative example between them. Hold this vertically and use propane gas burner B with an oxidizing flame length of 160 mm and a reducing flame length of 40 mm, so that the tip of the reducing flame of the burner is 20°.
Place it on the tip of the electric wire at an angle of , and let it roast for 1 hour. Determine the presence or absence of compound dripping during combustion and the fire spread time when the burner is removed. Filling workability: 70 using the compound of each example
Fill a mm0/×100mm conduit along with three cables with an outer diameter of 15mm approximately 70mm from the bottom to the top of the conduit, and judge the ease of work. Next, FIG. 2 shows an example of a wall penetrating portion using the fire protection composition of the present invention. An electric wire/cable _A1 passes through the through hole H of the wall W, and the void at this location is filled with the above-described fireproofing composition compound _K1 . With such wall penetrations, compound K ₁ completely prevents the spread of fire from one side of the wall to the other side of the wall along the wires/cables. As explained above, according to the present invention, the fire resistance is extremely high, the material in the penetration part is well bonded,
A fireproofing composition can be obtained that maintains sufficient airtightness, has little shrinkage or deformation, can withstand a wide range of usage conditions over a long period of time, can be easily disassembled when replacing wiring, etc., and can be easily filled.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a method for testing the fire resistance of the fireproofing composition of the present invention, and FIG. 2 is an explanatory diagram showing an example of a wall-penetrating portion of an electric wire using the fireproofing composition of the present invention. W: wall, H: through hole, A ₁ , A ₂ : cable,
K ₁ , K ₂ : Compound, C: Conduit, B:
Bunsen burner.

Claims (1)

[Claims] 1 The entire composition or the main part is 200 to 100 parts by weight of hydrated alumina to 100 parts by weight of liquid polychloroprene.
500 parts by weight of flame-retardant organic fibers, 5-40 parts by weight of flame-retardant organic fibers, and 1-30 parts by weight of silicone rubber.