JPH049825B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to a fireproof sealing material that is filled into a penetration part where an electric wire or cable penetrates a wall or floor. <Prior art and its problems> In general, electric wires and cables wired in high-rise buildings or factories often use flammable materials such as vinyl chloride and polyethylene for their insulation and protective layers. Once a fire occurs, there is a risk of the fire spreading along the wires and cables. For this reason, the penetration parts where electric wires and cables penetrate walls or floors are filled with a fireproof sealant to prevent the spread of fire. As this fireproof sealing material, for example, Japanese Patent Publication No. 53-34150 or Japanese Patent Publication No. 52
- There is something proposed in No. 12552. These are mainly composed of liquid chloroprene, a metal salt compound containing water of hydration, and flame-retardant fibers, and have poor fire resistance, viscosity, filling (sealing) workability, etc.
Although this is satisfactory, there is a risk that the sealing material may peel off during the combustion test. <Purpose of the Invention> The present invention has been made in view of the above-mentioned points, and has been developed without impairing the characteristics of conventional products, such as fire resistance, viscosity, filling (sealing) workability, and water resistance. ,
The objective is to improve the peeling resistance of the sealing material. <Description of structure and operation of the invention> In order to achieve the above-mentioned object, the present invention provides fireproof sealing material by adding hollow fine particles having an extremely small bulk density while having the effect of a fireproofing material to a fireproof sealing material. The specific gravity of the sealant is reduced to prevent it from peeling off. That is, in the present invention,
The main component is 100 parts by weight of liquid chloroprene,
200 to 500 parts by weight of a metal salt compound containing water of hydration, 5 to 15 parts by weight of cut flame-retardant fibers, and 10 to 10 parts by weight of hollow particles
It is characterized by being 70 parts by weight. The liquid chloroprene used in the present invention has an -OH group at the end, and examples include LCR-H050 (trade name) manufactured by Denki Kagaku Kogyo Co., Ltd.
It does not react with metal salt compounds and therefore
The putty-like fireproof sealing material exhibits the effect of not hardening over time. In the present invention, the basic composition is liquid chloroprene (LCR), a metal salt compound, and non-combustible fiber, and a filler to adjust the viscosity, a processing aid, a lubricant,
It is characterized by adding hollow fine particles to a conventional fireproof composition containing known additives such as plasticizers. Since these hollow fine particles are microspheres, which are also called microballoons, the hardness (viscosity) of the putty-like sealant is not greatly affected by the amount of the filler, unlike scale-like fillers. Hollow fine particles whose raw material is not resin-based can be used. However, flame-retardant resins such as phenol can also be used. The particle diameter of the hollow fine particles is preferably 5μ to 150μ. If the particle size becomes large, the spheres will collapse during the manufacturing process. Moreover, the effect of preventing peeling is no longer produced. Judging comprehensively from the viewpoint of manufacturing, peeling resistance, filling work, etc., it appears that a shirasu or glass-based raw material with a diameter of 30μ to 100μ is most effective. If the hollow fine particles are less than 10 parts by weight, good peeling resistance cannot be expected, and if they exceed 70 parts by weight, filling workability will be impaired. Examples of the plasticizer used in the present invention include CDP (cresyl diphenyl phosphate), TCP (tricresyl phosphate), and TOP (trioctyl phosphate). Examples of the metal salt compound used in the present invention include aluminum silicate, magnesium silicate, calcium carbonate, and the like in addition to aluminum hydroxide. If the metal salt compound is less than 200 parts by weight, good fire resistance cannot be expected, and if it exceeds 500 parts by weight, flaking resistance and filling workability will be impaired. The flame retardant fibers used in the present invention include asbestos,
Examples include inorganic fibers such as rock wool and glass wool, phenolic organic fibers (kynol), and metal fibers.
The fiber length is 1 to 15 mm, and 5 to 10 mm is usually used. If it is less than 1 mm, connection force cannot be expected.
On the other hand, if it exceeds 15 mm, dispersion will be poor and filling workability will also be poor. An example of manufacturing the fire-resistant sealing material of this invention is to put LCR into a kneader of a suitable capacity, add organic flame-retardant fibers, talc, and other materials that are difficult to disperse in order, and then add aluminum hydroxide and plasticizer. are added and kneaded until it becomes putty-like.Finally, hollow fine particles are added and kneaded until they are sufficiently dispersed. Note that the total kneading time is about 60 minutes. It goes without saying that for kneading, other known means such as a Banbury mixer can be used in addition to the kneader. <Examples> Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples, but these Examples are not intended to limit the present invention in any way. Practical Examples 1 to 4, Comparative Examples 1 to 3 The compositions of Examples 1 to 4 and Comparative Examples 1 to 3 were prepared according to the above manufacturing method with the compositions shown in the table below. These compositions (fireproof sealing materials) were then subjected to peeling resistance, combustion tests, filling workability, penetration tests, and water resistance tests as described below. (a) Peeling resistance test 1 As shown in Figure 4, 20 vinyl insulated vinyl sheathed cables (VV) 60mm ² x 3 cores x 30cm were lined up horizontally in contact with each other, and cross-linked polyethylene insulated vinyl sheathed cables (CV) 14mm were placed side by side. Arrange 19 pieces of ² x 3 cores x 30 cm so that they fit into the valleys of the VVs, and connect the fireproof seals of the example and comparative example so that they are in contact with the fireproof board 1 at a length of 20mm and the VV at a length of 50mm. Fill with material (putty) 2.
The sample constructed as described above was placed in a constant temperature room at 200° C. for 2 hours with the fireproof sealing material 2 facing down, and then the presence or absence of peeling was observed. Part 2 As shown in Figures 1 to 3, 20 pieces of VV60mm ² x 3 cores x 1.5m and 19 pieces of CV14mm ² x 1.5m are lined up between fireproof boards 1, and the gaps are compared with the examples. Fill with the example fireproof sealing material 2. 150mm from fireproof board 1 to the sample configured as above.
A ribbon burner 3 with a mouth width of 250 mm was set at a distance, and a flame was radiated at the sealing part at 13/min of LPG and 130/min of air, and the sealing material on the back side of the burner 3 was checked for peeling at 1050℃ for 2 hours. Observed. In both tests No. 1 and No. 2 above, those in which no peeling was observed were considered good. (b) Combustion test Same as above, as shown in Figures 1 to 3.
20 pieces of VV60mm ² × 3 cores × 1.5cm, CV14mm ² × 1.5m
19 pieces were lined up between fireproof boards 1, and the gaps were filled with the fireproof sealing materials 2 of Examples and Comparative Examples. A ribbon burner 3 with a mouth width of 250 mm was set at a distance of 500 mm from the fireproof board 1 on the sample configured as above, and LPG was 13/min and air was 130/min.
Flame was radiated to the seal part at 1050°C for 2 hours, and it was evaluated whether the temperature on the back side of the burner 3 was 340°C or less. Those with a temperature of 340°C or less were considered good. (c) Filling workability The quality of filling workability in terms of flexibility, viscosity, etc. was evaluated through actual work. (d) Penetration test Test device according to sections 5 and 4 of JISA5752 (direct reading type)
This was done using (e) Water resistance The sample was placed in water at room temperature for 7 days and checked for cracks, deformation, swelling and elution. The test results of (a) to (e) above are shown in the table. In addition, the first
In the figures, 4 is a PC floorboard, and 5 is a fixing frame.

[Table] As is clear from the above test results, the fireproof sealing material of the present invention has excellent fire resistance, filling workability, viscosity,
It can be seen that the peeling resistance has been improved without impairing the characteristics of conventional products such as water resistance. <Effects of the Invention> As explained above, the fireproof sealing material of the present invention has the following effects:
It improves peeling resistance without impairing the properties of conventional products such as fire resistance, filling workability, viscosity, and water resistance, and further improves the fire-spread prevention cable penetration part of electric wires and cables.

[Brief explanation of drawings]

Figure 1 is a front view of the test specimen to explain the combustion test, Figure 2 is a vertical cross-sectional plan view of Figure 1, Figure 3 is a partial vertical cross-sectional side view of Figure 1, and Figure 4 is a test piece showing resistance to flaking. It is a longitudinal side view of a test piece for explaining a test. 1... Fireproof board, 2... Fireproof sealing material.

Claims (1)

[Claims] 1. The main components are 100 parts by weight of liquid chloroprene, 200 to 500 parts by weight of a metal salt compound having water of hydration, 5 to 15 parts by weight of cut flame-retardant fibers, and 10 to 70 parts by weight of hollow particles. A fire-resistant sealing material characterized by: 2 Aluminum hydroxide as the metal salt compound
The fire-resistant sealing material according to claim 1, wherein 200 to 350 parts by weight is used, organic flame-retardant fibers are used as the flame-retardant fibers, and an appropriate amount of antimony trioxide is added.