JPS6127431B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a non-hardening fire sealing material,
The purpose is to easily fill the gaps between cables at cable installation locations and between cables and cable penetration holes in walls or floors, and to provide the flexibility to easily dismantle and remove cables in the future when adding or removing cables. It is an object of the present invention to provide a non-hardening type fireproof sealing material for cables, which does not soften or sag even when exposed to flame, and is not easily eroded. Generally, polyethylene, polyvinyl chloride, synthetic rubber, etc. are used as coating materials for electric wires and cables, but since these materials are flammable, conventionally flame retardants were added to these materials to make them flame retardant. However, simply making it flame retardant does not provide sufficient fire protection in the event of a fire. For this reason, it is currently necessary to prevent the spread of fire by applying fire-retardant paint to the cable sheathing, or by filling the gaps between cables and between cables and cable penetration holes in walls or floors with fire-retardant sealants. is being attempted. The mixture of the present invention provides a fire-protective mixture particularly suitable as the latter fire-retardant sealing material. Conventional fire prevention mixtures of this type include emulsified resins mixed with flame retardants and inorganic nonflammable fibers, but this mixture has a water content of approximately 40%.
Because of the weight percentage, gaps are created between the cable and the mixture, and between the through hole in the wall or floor and the mixture, and since this mixture hardens after the moisture evaporates, it is difficult to dismantle the cable after it is installed. The drawback was that it was difficult. Another type of fireproofing sealant is a foaming fireproofing sealant whose main components are a nonvolatile organic binder, polyhydric alcohol, and a phosphoric acid compound, but when exposed to flame, this sealant
As the temperature rises, the phosphoric acid compound decomposes and foams, and the decomposed phosphoric acid compound carbonizes the polyhydric alcohol to form a carbonized foam layer, which serves as a heat insulating layer. Therefore, this fireproof sealing material can be expected to have a considerable heat insulating effect, but the organic binder released by the flame may ignite, and the carbonized foam layer may erode when exposed to flame for a long time. The effect disappears, and
Because the main ingredients are organic substances, they soften and sag as the temperature rises, and polyhydric alcohols and phosphoric acid compounds generally dissolve easily in water, so they are used in humid places or places exposed to water. As a result, there are drawbacks such as water being eluted and foaming no longer occurring, and it cannot be said to be sufficient. The present invention was developed as a result of various studies in view of the above-mentioned circumstances, and the outline thereof is as follows. Di(2-ethylhexyl)adipate, di(2
- 50 to 100 parts by weight of a carboxylic acid ester binder selected from the group consisting of ethylhexyl) azelate, di(2-ethylhexyl) sebacate, dibutyl phthalate, trioctyl trimellitate, dioctyl phthalate, ditridecyl phthalate, and diisodecyl phthalate; cresyl phosphate, trioctyl phosphate, tributyl phosphate, triphenyl phosphate, tris(2-chloroethyl) phosphate,
10 to 60 parts by weight of a phosphate ester binder selected from the group consisting of tris(2,3-dibromopropyl) phosphate, and 200 to 600 parts by weight of an inorganic hydroxide.
parts by weight, 50 to 150 parts by weight of organic halogen flame retardant, 10 to 60 parts by weight of antimony trioxide, 5 to 50 parts by weight of inorganic nonflammable fiber, and 11 to 50 parts by weight of synthetic rubber with chlorine bonded in its molecule. It is a fireproof sealing material consisting of. In this invention, since the above-mentioned carboxylic ester-based binder and the above-mentioned phosphoric ester-based binder are used together, there is little risk that the binder will volatilize and dissipate and disappear due to temperature changes. Therefore, there is no fear that the sealant will shrink, and the initial hardness after adjustment of the sealant can be maintained over time, resulting in good workability during disassembly. In addition, phosphoric acid esters in particular have a flame retardant effect and create a fireproof shell when carbonized, but they are difficult to form into a putty by themselves, but can be easily made into a putty by mixing them with a carboxylic acid. It is fire retardant because it contains hydroxide, and it is particularly fire retardant because it releases crystal water when exposed to flame. Since it contains inorganic nonflammable fibers, it not only has fireproof properties, but also binds the various substances in the sealing material and prevents cracking, especially when exposed to flames. Organic halogen flame retardants and antimony trioxide work together to exhibit a flame-retardant effect, and the synthetic rubber that has chlorine bonded in its molecules has good compatibility with binders, making it easy to work with as a sealant. It provides elasticity and exhibits a sealing effect without sagging even when the temperature at the place of use rises. Next, the blending range in the present invention will be explained as follows. As mentioned above, it is important that 50 to 100 parts by weight of a carboxylic acid ester binder and 10 to 60 parts by weight of a phosphoric acid ester binder coexist to ensure that the binder remains. This is different from the one using a binder. If the carboxylic acid ester binder is less than 50 parts by weight or the phosphate ester binder is less than 10 to 60 parts by weight, the mixture becomes too hard, making it difficult to perform sealing action, that is, filling narrow gaps.
Moreover, if the carboxylic acid ester binder exceeds 100 parts by weight, the mixture becomes too soft and difficult to handle, and there is a risk of deformation at room temperature after being filled into a narrow gap. The target hardness of the fireproof sealing material is in the range of 60 to 120 in terms of penetration, and the amount of the binder blended is appropriate to satisfy this. Furthermore, the phosphate ester binder in the binder also exhibits a flame retardant effect due to its chemical structure. Next, inorganic hydroxides include aluminum hydroxide, magnesium hydroxide, etc., which give appropriate hardness to the compound, prevent cracks from occurring during use, and prevent flames from occurring in a fire. When exposed to water, it releases crystal water and contributes to fire protection. If it is less than 200 parts by weight, the fire protection effect is insufficient, and if it exceeds 600 parts by weight, the sealant becomes too hard and cannot be used in narrow gaps. Filling becomes difficult. In addition, if the organic halogen flame retardant is less than 50 parts by weight, it cannot be expected to have much flame retardant effect, and even if it exceeds 150 parts by weight, the flame retardant effect will not change much and the sealant will become hard, making it difficult to fill into narrow gaps. becomes difficult. Examples of such organic halogen flame retardants include chlorinated paraffin, chlorinated polyolefin,
Examples include perchloropentacyclodecane, tetrabromobutane, hexabromobenzene, decabromodiphenyl oxide, and pentabromochlorohexane. Furthermore, as mentioned earlier, antimony trioxide enhances the flame retardant effect when used in combination with a halogen flame retardant, but if the amount is less than 10 parts by weight, it is insufficient to increase the flame retardant effect. However, if it is added in excess of 60 parts by weight, it will be excessive and will not contribute much to improving the flame retardant effect. Next, inorganic noncombustible fibers include asbestos, rock wool, etc., which prevent the occurrence of cracks in the fire sealing material when it is exposed to flame, but if the amount is less than 5 parts by weight, cracks will occur. If the amount exceeds 50 parts by weight, the sealant becomes too hard, which is not preferable. Furthermore, by blending synthetic rubber with chlorine bonded in its molecules, it increases its thixotropic properties, making it easier to fill into narrow gaps. This also has the effect of preventing the mixture from dripping and being easily carbonized when it comes into contact with flame, making it difficult to burn. If the amount of synthetic rubber is less than 11 parts by weight, the thixotropic properties will not increase, workability will not improve, and dripping will occur when exposed to high temperatures, and if it exceeds 50 parts by weight, the sealant will become hard. 11 to 50 parts by weight is preferable since handling becomes inconvenient if the amount becomes too large. Next, examples of the present invention will be shown. The composition of the fire sealing material used is shown in the table below.

[Table] Hygilite used in the above mixture has a particle size of 0.5 to 2μ, antimony trioxide has a particle size of 1 to 3μ,
Asbestos is approximately 0.8 mm long, chlorinated paraffin has a chlorine weight of 70%, a molecular weight of 1062.5, and a specific gravity.
1.60 to 1.70, chlorsulfonated polyethylene (DuPont product name Hypalon) has a Cl content of approximately 43
%, with an S content of about 1%. The mixture first contains DOA, Tris(2,3
- dibromopropyl) phosphate, hygilite, chlorinated paraffin, antimony trioxide,
After the chlorosulfonated polyethylene was kneaded and uniformly dispersed, asbestos was added little by little and kneaded until it was uniformly dispersed. Combustion Test As shown in the attached drawing, the mixture 2 with a thickness of 3 mm was applied to the cable 1, and the mixture was burned in a gas burner 3 for 30 minutes to observe the spread of fire and the presence or absence of cracks. The results are shown in Table 1.

[Table] Next, Table 2 shows the characteristic results of the mixture of the present invention. The present invention is of Example No. 1.

【table】

[Table] “Effect on cable sheath” of the above test items
A cable sheath piece (made of polyethylene or polyvinyl chloride) was embedded in the fireproof mixture obtained in Example No. 1, and the cable sheath was aged by heating at 100°C for 10 days from the outside, and the cable sheath before and after heating was The material properties (tensile strength, elongation properties) of
The metal plates were embedded and heated in an oven at 60°C for 7 days, and after cooling to room temperature, the metal plates were taken out and visually observed for rust, discoloration, etc. As is clear from the above, the present invention maintains its initial softness for a long period of time, does not ignite even when exposed to flame, has little corrosion, does not soften or sag, and does not crack. It is possible to provide a non-curing fireproof sealing material for cables.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing a combustion test of an admixture according to the present invention. 1... Cable, 2... Fire sealing material, 3
……Gas burner.

Claims (1)

[Claims] 1 selected from the group consisting of di(2-ethylhexyl) adipate, di(2-ethylhexyl) azelate, di(2-ethylhexyl) sebacate, dibutyl phthalate, trioctyl trimellitate, dioctyl phthalate, ditridecyl phthalate, diisodecyl phthalate 50 to 100 parts by weight of a carboxylic acid ester binder, tricresyl phosphate, trioctyl phosphate, tributyl phosphate, triphenyl phosphate, tris(2-chloroethyl) phosphate, tris(2,3-dipromopropyl) 10 to 60 parts by weight of a phosphate ester binder selected from the group consisting of phosphates, and an inorganic hydroxide.
200-600 parts by weight and 50-150 parts of organic halogen flame retardant
10 to 60 parts by weight of antimony trioxide, 5 to 50 parts by weight of inorganic nonflammable fibers, and 11 to 50 parts by weight of synthetic rubber in which chlorine is bonded in the molecule. .