JPS643232B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an improvement of a fire protection putty composition, and relates to a non-crosslinked fire protection putty composition that does not dry at room temperature. In general, putty-like compositions that do not dry at room temperature are used in civil engineering, construction, other electrical, automobile, and other fields.
It is used to fill voids in penetrating parts of walls, floors, etc., or to maintain airtightness and watertightness. Such a fireproof putty composition is based on a nonflammable or flame-retardant organic binder, to which are added an inorganic filler such as aluminum hydroxide, a flame retardant such as antimony trioxide or a phosphorus compound, and reinforcing fibers. Products consisting of admixtures have appeared. However, although such a putty composition can achieve its purpose as a fire prevention agent, it lacks flexibility, making it difficult to work with, and has poor morphological stability as it changes over time and changes shape when left unused. . The present invention has been made as a result of intensive research aimed at improving these drawbacks, and as a result has discovered a fireproof putty composition that is excellent in not only fireproofing properties but also workability and shape retention. That is, in the present invention, 1 to 35 parts of chloroprene rubber is added to 100 parts by weight of a chloroprene polymer that is liquid at room temperature.
Part by weight, water-insoluble inorganic filler with water of hydration
It is a mixture of 200 to 600 parts by weight and 15 to 100 parts by weight of heat-resistant fiber. In the present invention, in particular, by blending unvulcanized chloroprene rubber, excellent elasticity and elongation can be imparted, and since the rubber has flame retardancy, fire protection properties can be improved. That is, by imparting elasticity, the shape stability of the composition of the present invention is increased, and even when external force is applied, it does not deform and has resistance. Furthermore, by imparting elongation, workability can be extremely easily achieved. Although other rubbers such as butyl rubber and ethylene propylene rubber have excellent elongation properties, these rubbers have poor fire resistance properties and are difficult to use as fire prevention putty. In the present invention, a chloroprene polymer that is liquid at room temperature has a viscosity of 10,000 to 10,000 at room temperature (25°C).
200,000 centipoise, preferably 40,000 to 120,000 centipoise, refers to an unvulcanized chloroprene liquid homopolymer or chloroprene liquid copolymer with a molecular weight of 1,000 to 6,000, and may or may not have a functional group at the molecular end. There's no question. The chloroprene copolymer includes monomers that can be copolymerized with chloroprene, such as styrene, methyl methacrylate, acrylonitrile, 1,3-butadiene,
Vinyl compounds such as isoprene and conjugated diene compounds are used. In addition, in the present invention, the addition of a solid unvulcanized chloroprene polymer prevents it from changing over time, hardening during storage, or changing its physical properties, and its properties are 10-35. It is a slow crystallization type that hardly crystallizes even if it is left for more than one year in the commonly used temperature range of .degree. C., and there is no change in Mooney viscosity. The amount added is preferably 1 to 35 parts by weight, preferably 10 to 20 parts by weight, per 100 parts by weight of the liquid chloroprene polymer. The reason for this is that if the amount is less than 1 part by weight, almost no effect will be obtained, and if it exceeds 35 parts by weight, workability will decrease and it will not be possible to obtain a putty with good properties. In addition, in the present invention, water-insoluble inorganic fillers such as hydrated alumina, hydrated magnesia, and hydrated calcium silicate are added, and in particular, hydrated alumina (general formula Al ₂ O ₃ ·nH ₂ O, where n= 1/2~3)
is the most effective, and the amount added is 200 to 600 parts by weight, preferably 250 to 450 parts by weight, per 100 parts by weight of the liquid chloroprene polymer. The reason why the amount added is limited to the above range is that if the amount is outside this range, a putty composition that is well integrated cannot be obtained. In addition, in the present invention, mechanical performance is improved by adding heat-resistant fibers such as glass fiber, asbestos, rock wool, and flame-retardant organic fibers.
In particular, it is most preferable from the viewpoint of fire prevention performance, putty performance, and economical efficiency. The amount added is preferably 15 to 100 parts by weight per 100 parts by weight of the liquid chloroprene polymer.
It is 25 to 60 parts by weight. The reason for limiting the amount added is that if it is less than 15 parts by weight, a sufficient reinforcing effect cannot be obtained, and if it exceeds 100 parts by weight, it becomes too hard and significantly impedes workability. Furthermore, in the present invention, fillers such as calcium carbonate and clay, and flame retardants such as antimony trioxide and phosphorus-containing compounds may be added. To obtain the composition of the present invention, the above-mentioned materials may be kneaded using a kneader or the like. Next, examples of the present invention will be described. Examples (1) to (7) Fireproof putty compositions of the present invention were obtained according to the compositions shown in Table 1. Table 1 also shows the results of measurements regarding workability, morphological stability, etc.

【table】

[Table] Comparative Examples (1) to (6) Comparative fire prevention putty compositions were obtained with the compositions shown in Table 2. In addition, the results of measurements regarding workability, morphological stability, etc. are also listed in Table 2.

【table】

[Table] As detailed above, the present invention is extremely useful as a fireproof sealing material for through-holes in cable walls, floors, etc. because it has excellent workability and morphological stability and has an increased oxygen index.

Claims (1)

[Scope of Claims] 1. 100 parts by weight of a chloroprene polymer that is liquid at room temperature, 1 to 35 parts by weight of chloroprene rubber, 200 to 600 parts by weight of a water-insoluble inorganic filler containing water of hydration, and 15 to 600 parts by weight of a heat-resistant fiber. A fireproof putty composition characterized in that 100 parts by weight is mixed therein. 2 Average molecular weight as liquid chloroprene polymer
1,000 to 6,000 centipoise, and a viscosity of 10,000 to 200,000 centipoise at room temperature. 3. The fire protection putty composition according to claim 1, which is unvulcanized as chloroprene rubber and has a slow low-temperature crystallization rate and a Mooney viscosity of 40 to 60. 4. The fireproof putty composition according to claim 1, characterized in that the insoluble inorganic filler comprises hydrated alumina, hydrated magnesia, and hydrated calcium silicate. 5 Glass fiber, asbestos, rock wool,
The fireproof putty composition according to claim 1, characterized in that it is made of flame-retardant organic fiber.