JPS61168688A - Putty-like fireproof composition - Google Patents

Abstract

PURPOSE:The titled compsn. with excellent filling properties and fireproof performance with out causing shrinking during drying, which comprises an aq. emulsion resin, org. flame retarder, inorg. filler, flame-retardant liquid material, inorg. fiber and water. CONSTITUTION:8-20% (by wt.; the same applies hereinafter), in terms of solid, aq. emulsion resin such as polyvinyl acetate emulsion, 1-10% org. flame retarder such as chlorinated paraffin or decarbromodiphenyl oxide and, if necessary, Sb2O3, 40-60% inorg. filler such as CaCO3, 1-10% flame-retardant liquid material such as tris-beta-chloroethyl phosphate, 1-10% inorg. fiber such as a ceramic fiber and not more than 25% water are compounded. A wetting agent, an antifoamer, a bactericide and the like are additionally compounded if necessary.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a putty-like fire protection material that is filled into gaps between cables and between cables and cable through-holes in walls, floors, etc. to prevent the spread of fire in the event of a fire. The present invention relates to a composition.

[Conventional technology]

Electric wires and cables used in buildings, plants, etc.
Many combustible materials such as polyethylene V and polyvinyl chloride are used as insulators and sheaths for these devices.As a result, fires can spread to electric wires and cables, and the fire can propagate through penetrations in walls and floors. It is not uncommon to reach this point.

In order to prevent this, methods have been adopted such as applying fire spread prevention paint to electric wires and cables, and sealing the penetration parts with sealants made of fireproof compositions.

As a method of sealing the penetration part, calcium silicate plate,
There is a method that uses an inorganic material such as rock wool and a water-based putty-like composition.Aqueous putty-like compositions have excellent adhesion to cables and inorganic compositions, are easy to fill, and have excellent fire resistance. There is an advantage.

However, conventional aqueous putty-like compositions have the problem of shrinking in volume as they dry and having to be refilled. Having to do so will impede work efficiency.

[Problem that the invention seeks to solve]

The present invention has been made based on the above, and an object of the present invention is to provide a putty-like fireproofing composition that exhibits almost no shrinkage after filling and has excellent fire resistance.

[Means for solving problems]

The fire prevention and fire protection composition of the present invention has a main composition of 8 to 20
Weight% aqueous emulsion resin solids, 1-10% by weight
organic flame retardant, 40-60% by weight inorganic filler, 1-1
0% by weight of flame retardant liquid, 1-10% by weight of inorganic fibers,
and 25% by weight or less of water.

In the present invention, as the aqueous emulsion resin, polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, vinyl acetate-propio/acid vinyl copolymer emulsion, vinyl acetate-acrylate copolymer emulsion, acrylic acid ester copolymer emulsion, etc. are used. These can be used alone or in combination of two or more. Water-based emulsion resin functions as a binder, but since it is generally flammable, it is preferable to use the minimum amount, and the resin solid content is 8 to 20% by weight. - If it is less than 8% by weight, its function as a binder will deteriorate, and if it exceeds 20% by weight, the resin content will be flammable, resulting in insufficient flame retardancy after drying - As an organic flame retardant is chlorinated paraffin, chlorinated naphthalene, decabromodiphenyl oxide, pentabromoethylbenzene, tetrafuromophthalic anhydride, ethylene bis(tetrapromophthalimide), ethylene bis(
5,6-dipromonorbonene-2,3-dicarboximide) and the like are suitable.

The amount of organic flame retardant added must be in the range of 1 to 10% by weight based on the total weight of the composition; if it is less than 1% by weight, flame retardancy is poor, and if it exceeds 10% by weight, harmful gas will be generated during combustion. Combining an undesirable monochlorine compound and an antimony compound (such as antimony trioxide) increases the flame retardant effect, so when a chlorine compound is included, it is desirable to use antimony trioxide in combination.

Examples of inorganic fillers include calcium carbonate, aluminum oxide, magnesium silicate, silica, alumina, aluminum silicate, zinc borate, and titanium dioxide.

The inorganic filler forms the backbone of the fire protection composition and should range from 40 to 50% by weight of the total composition weight.

If it is less than 40% by weight, the fire resistance is insufficient, and if it is less than 50% by weight.
If it exceeds this, the mechanical strength after drying will decrease.

Flame-retardant liquid materials are useful as a medium for kneading compositions containing large amounts of powder or fibers, and include liquid chlorinated paraffin, tris-β-chloroethyl phosphate, tricresyl phosphate, and the like.

The amount added must be in the range of 1 to 10% by weight based on the total weight of the composition; if it is less than 1% by weight, cracks are likely to occur during drying, and if it exceeds 10% by weight, the stickiness will become strong and the filling workability will be affected. decreases.

Inorganic fibers include asbestos, glass fiber, ceramic fiber, rock wool, etc., and are often used in the form of relatively short fibers, for example, in a length of about 0.5 to 15 fibers.

The amount of inorganic fiber mixed must be in the range of 1 to 10% by weight based on the total weight of the composition; if it is less than 1% by weight, the fire resistance will be poor, and if it exceeds 10% by weight, it will become hard and the filling workability will decrease.

Moisture is necessary when kneading the composition, and considering shrinkage after drying, it is necessary to keep the content to 25% by weight or less based on the total weight of the composition. If it exceeds 25% by weight, shrinkage during drying will be large and cracks may occur locally.

In the present invention, various wetting agents, antifoaming agents, bactericidal agents, etc. may be contained in addition to the above-mentioned components as necessary.

〔Example〕

A uniform putty-like fire protection composition was prepared using a stirrer according to the mixing ratios shown on each side of Table 1.

The results of evaluating the filling workability and fire resistance of this putty-like fire protection composition are shown in the lower column of Table 1.

Evaluation is based on the following method.

(1) Filling workability Conduit with outer diameter 7Qm x 1 length 1001jL with outer diameter 2
Qm, 7 vinyl insulated vinyl sheathed electric wires with a length of 300 elbows were inserted, and the gaps between them were filled with rock wool.The outer part of the conduit 3011E was filled with a putty-like fire prevention composition.
We observed the presence of cracks due to shrinkage during drying and adhesion to electric wires (2) Fire resistance The sample prepared in (1) was held vertically and the length of the oxidation flame was 1.
Using a propane gas burner with a length of 601M and a reducing flame of 4013L, place the burner's reducing flame at the tip of the cable at an angle of 20 degrees, and burn for 1 hour. The presence or absence of dripping of the filling and the presence or absence of flame penetration were observed - and the solidification state after leaving the burner was observed. From Table 1, the compositions of Examples 1 to 4 falling within the scope of the present invention. When the material was used, there was little shrinkage during drying after filling, and no cracks were generated. In addition, drip during combustion,
There was no penetration of flame, and no shape shift after combustion.

Comparative Example 1 shows an example of a composition that does not contain a flame-retardant liquid material, and although it had little shrinkage, its hardness made filling workability poor, and its adhesiveness was poor, so flame penetration was observed. It was done.

Comparative Example 2 contained 25% by weight or more of water and had excellent adhesive properties, but had large shrinkage after drying and had to be refilled. Note that the fire resistance after refilling was good.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to obtain a putty-like fireproofing composition that has extremely high fireproofing performance, is easy to fill, and does not shrink during drying.

Claims (1)

[Claims] (1) The main part of the composition is an organic flame retardant with a solid content of 8 to 20% by weight, an aqueous emulsion resin of 1 to 10% by weight, and 40 to 6% by weight.
A putty-like fire protection composition comprising 0% by weight of an inorganic filler, 1-10% by weight of a flame-retardant liquid, 1-10% by weight of inorganic fibers, and 25% by weight or less of water.