GB2092599A

GB2092599A - Fireproof putty composition

Info

Publication number: GB2092599A
Application number: GB8202932A
Authority: GB
Original assignee: Furukawa Electric Co Ltd
Current assignee: Furukawa Electric Co Ltd
Priority date: 1981-02-09
Filing date: 1982-02-02
Publication date: 1982-08-18
Also published as: BR8200672A; DE3204387C2; AU8020582A; KR880001521B1; JPS643232B2; AU529611B2; DE3204387A1; GB2092599B; JPS57131262A; KR830009185A

Abstract

A fireproof putty composition is provided which is a mixture of 100 parts by weight of a chloroprene-type polymer which is in liquid phase at room temperature, 1 to 35 parts by weight of a chloroprene rubber, 200 to 600 parts by weight of a water- insoluble organic filler containing water of hydration, and 15 to 100 parts by weight of a heat-resistant fiber.

Description

SPECIFICATION Fireproof putty composition The present invention relates to an improvement in a fireproof putty composition and, more particularly, to a non-crosslinked fireproof putty composition which is non-drying.

Fireproof putty compositions which are non-drying at room temperature are generally used in the fields of civil engineering, electric engineering, automobiles and so on for the purpose of filling gaps in walls, floors or the like, or of maintaining water- or air-tightness.

Examples of fireproof putty compositions include a mixture of a base material comprising a noncombustible or fire-retardant organic binder with an inorganic filler such as aluminum hydroxide, a fire-retardant such as antimony trioxide or a phosphorus compound, and a reinforcing fiber.

Although the putty composition as described above exhibits good fireproof property, it is poor in consistency. Therefore, the putty composition of the type described above has poor operability and involves changes with time. When the composition is left to stand, it changes in shape, with resultant poor stability in shape.

The present invention has been made in consideration of this problem and has for its object to provide a fireproof putty composition which is excellent in fireproof property and which is excellent in operability and stability in shape.

In order to achieve the above and other objects, there is provided according to the present invention a fireproof putty composition comprising a mixture of 100 parts by weight of a chloroprenetype polymer which is in liquid phase at room temperature, 1 to 35 parts by weight of a chloroprene rubber, 200 to 600 parts by weight of a water-insoluble inorganic filler containing water of hydration, and 1 5 to 100 parts by weight of a heat-resistant fiber.

According to the present invention, since unvulcanized chloroprene rubber is used as a chloroprene rubber, excellent elasticity and elongation are assured. Since the unvulcanized chloroprene rubber has fire-retardancy, the fireproof property of the composition is improved. The excellent elasticity improves the stability in shape of the composition. When the compositon is subject to an external force, it does not deform and is resistant to the external force. The excellent elongation significantly improves the operability. Although rubbers other than chloroprene rubber such as butyl rubber, ethylene propylene rubber are also excellent in elongation, these rubbers are poor in fireproof property and are thus difficult to use for fireproof putty compositions.

The chloroprene-type polymer which is in liquid phase at room temperature includes herein an unvulcanized chloroprene liquid homopolymer or chloroprene-type liquid copolymer which has a viscosity of 10,000 to 200,000 cps, preferably 40,000 to 120,000 cps at room temperature (250C) and a molecular weight of 1,000 to 6,000. These polymers may or may not have functional groups at the terminal ends of the molecules. Examples of comonomers forming copolymers together with chloroprene include conjugated diene compounds or vinyl compounds such as stryrene, methyl methacrylate, acrylonitrile, 1,3-budadiene, and isoprene.

According to the present invention, a solid unvulcanized chloroprene rubber is added for the purpose of preventing changes with time in, for example, shape and in properties. The rubber addition is also effective for preventing the composition from being hardened during storage. The solid unvulcanized chloroprene rubber used herein is of a low crystallization rate type such that it crystallizes only slightly after storing at the usual working temperature of 10 to 350C over one year, and is also of a type which allows no changes in the Mooney viscosity. The amount of the unvulcanized chloroprene rubber to be added is 1 to 35 parts by weight, preferably 10 to 20 parts by weight based on 100 parts by weight of the liquid chloroprene-type polymer.If the unvulcanized chloroprene rubber is added in the amount less than 1 part by weight, the addition thereof may not result in favourable effects. On the other hand, if the unvulcanized chloroprene rubber is added in the amount exceeding 35 parts by weight, the operability is degraded and a putty of only poor properties is obtained.

According to the present invention, water-insoluble inorganic filler is added, examples of which include hydrated alumina, hydrated magnesia, and hydrated calcium silicate. Among them, it is most effective to add hydrated alumina (general formula Awl 203 nH2O wherein n = 1/2 to 3). The waterinsoluble inorganic filler, the best example of which is hydrated alumina, is added in the amount of 200 to 600 parts by weight, preferably 250 to 450 parts by weight based on 100 parts by weight of the liquid chloroprene-type polymer. The water-insoluble inorganic filler is added in the amount of the range as defined above since putty compositions of acceptable, uniform properties may not be obtained otherwise.

The mechanical performance of the putty composition is improved by adding a heat-resistant fiber such as glass fiber, asbestos, rock wool, or a fire-retardant organic fiber according to the present invention. The addition of the heat-resistant fiber is prefeable from the viewpoints of fireproof performances, putty performance, and economy. The heat-resistant fiber is added in the amount of 1 5 to 100 parts by weight, preferably 25 to 60 parts by weight based on 100 parts by weight of the liquid chloroprene-type polymer. When the heat-resistant fiber is added in the amount less than 1 5 parts by weight, satisfactory reinforcing effects may not be obtained. On the other hand, when the heat-resistant fiber is added in the amount exceeding 100 parts by weight, the resultant putty composition becomes too hard and extremely impairs the operability.

According to the present invention, it is possible to add a filler such as calcium carbonate or clay, and a fire-retardant such as antimony trioxide or a phosphorus-containing compound.

In order to obtain the putty composition of the present invention, the components as described above are kneaded by a kneader.

The present invention will now be described by way of its examples.

EXAMPLES 1 to 7 The fireproof putty compositions as shown in Table 1 are obtained. The operability, the stability in shape and so on of the resultant fireproof putty compositions were measured. The obtained results are also shown in Table 1 below.

TABLE 1

Example Example Example Example Example Example Example 1 2 3 4 5 6 7 Liquid chloroprene rubber 91) 100 100 60 - - - 20 Liquid chloroprene rubber (2) - - 40 100 100 100 80 Solid chloroprene rubber (3) 15 5 5 30 25 10 15 Hydrated alumina (4) 300 240 450 260 520 350 330 Chlorinated paraffin (5) - 50 - - - - Calcium carbonate (6) - - - 30 - 10 Antimony trioxide (7) 10 10 10 10 10 10 10 Asbestos fiber (8) - - 10 - 20 - Asbestos fiber (9) 50 30 10 50 20 60 20 Phenol-type organic fiber (10) - 10 - 30 - - 30 n-dioctylphthalate (11) 20 - 40 25 35 15 Operability in shape (12) O O O O O O O Stability in shape (13) O O O O O O O Oxygen index 85 or 82 80 80 85 or 85 or 82 more more more Notes: (1) 105,000 cps viscosity at 250C and 3,100 number-average molecular weight.

(2) 50,000 cps viscosity at 250C and 2,000 number-average molecular weight.

(3) Unvulcanized chloroprene rubber of low crystallization type having 45 Mooney viscosity.

(4) 3.5 m average particle size and 99% or more purity.

(5) Powder of 70% by weight chlorination.

(6) Heavy calcium carbonate having 2 ym average particle size.

(7) 1 ym average particle size and 99% or more purity.

(8) 800 wet volume (after standing for 120 minutes) according to JISM8602, and class 5T.

(9) 650 wet volume (after standing for 120 minutes) according to JISM8602, and class 6D.

(10) Trade name: Kynol (antiflaming fiber) manufactured by Japan Kynol Co., Ltd.

(11) Plasticizer: 3860C boiling point and 0.986 specific gravity.

(12) Measurement according to JlSA5752 (glass putty consistency).

The load applied was 1 50 g and the test time was 5 seconds. The composition marked with 0 had a value of 40 or more at 200 C, and the composition marked with X had a value of less than 40 at the same temperature.

(1 3) The putty material was formed into a ball of 50 mm diameter and was left to stand at a temperature of 600C or lower for one month. The composition which resulted in almost no change in shape is marked with 0, and the composition which resulted in significant changes in shape is marked with X.

COMPARATIVE EXAMPLES 1 to 6 The fireproof putty compositions as shown in Table 2 were obtained as comparative examples.

The operability, the stability in shape and so on of the resultant fireproof putty compositions were measured. The obtained results are also shown in Table 2 below.

TABLE 2

Comparative Comparative Comparative Comparative Comparative Comparative Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Liquid chloroprene rubber (1) 100 100 50 20 - Liquid chloroprene rubber (2) - - 50 80 100 100 Solid chloroprene rubber (3) - - 30 5 - 50 Hydrated alumina (4) 350 220 680 150 700 300 Chlorinated paraffin (5) - 50 - 100 - Calcium carbonate (6) - 50 - 50 - Antimony trioxide (7) 10 10 10 10 10 10 Asbestos fiber (8) 10 10 10 - - Asbestos fiber (9) - 10 30 80 10 10 Phenol-type organic fiber (10) - - - 60 - 30 n-dioctylphthalate (11) 30 - 25 - 60 10 Operability (12) O O X X X X Stability in shape (13) X X O O X X Oxygen index 82 75 85 or more 71 75 75 Notes: (1) to (13) . . . same as in Table 1.

In summary, according to the present invention, a fireproof putty composition with excellent operability and stability in shape and an increased oxygen index is obtained. The fireproof putty composition is extremely useful as a fireproof sealing material for sealing holes in wall or floors, through which run electric cables.

Claims

1. A fireproof putty composition comprising a mixture of 100 parts by weight of a chloroprenetype polymer which is in liquid phase at room temperature, 1 to 35 parts by weight of a chloroprene rubber, 2000 to 600 parts by weight of a water-insoluble inorganic filler containing water of hydration, and 1 5 to 100 parts by weight of a heat-resistant fiber

2. A composition according to claim 1, wherein the chloroprene-type polymer has an average molecular weight of 1,000 to 6,000 and a viscosity of 10,000 to 200,000 cps at room temperature.

3. A composition according to claim 1, wherein the chloroprene rubber is unvulcanized, has a low crystallization rate at low temperatures, and has a Mooney viscosity of 40 to 60.

4. A composition according to claim 1, wherein the water-insoluble inorganic filler is a member selected from the group consisting of hydrated alumina, hydrated magnesia, and hydrated calcium silicate.

5. A composition according to claim 1, wherein the heat-resistant fiber is a member selected from the group consisting of glass fiber, asbestos, rock wool, and a fire-retardant organic fiber.

6. A fireproof putty composition, substantially as hereinbefore described with reference to Examples.