JPS5977870A - Fire fighting composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire protection composition, particularly a self-extinguishing fire protection composition that prevents the spread of fire to electric wires and cables.

In electrical equipment where a large number of cables are installed, in the event of a fire, there is a risk that the rubber, plastic, etc. used in the cables will spread, so to prevent the spread of fire. A method of coating the cable surface with a fireproofing composition has been considered. An example of a typical fire protection composition is a water-emulsified resin such as polyvinyl acetate or ethylene-vinyl acetate copolymer mixed with inorganic nonflammable fibers such as asbestos, rock wool, and glass fiber. It is known that flame retardants such as chlorinated paraffin are mixed in, but in order to increase the self-extinguishing properties and make it as close to nonflammable as possible, it is necessary to increase the amount of inorganic fibers to make it flammable. It is necessary to reduce the amount of water-based emulsifying resin.

However, since the water-emulsified resin plays the role of a binder that binds inorganic nonflammable fibers together, if the mixing ratio of this resin is reduced, the fire protection composition becomes hard and brittle, making it difficult to bend cables coated with this composition. If the coating layer exceeds 100%, the coating layer of the composition may crack, and the cable may easily peel off. or,
Furthermore, especially when a conventional fire protection material A is applied to a polyethylene insulated polyethylene sheathed cable or the like in the event of a fire, the pyrolysis gas of the polyethylene breaks through the coating, and the effect of preventing the spread of fire is insufficient.

The present invention was made in view of the above-mentioned circumstances, and relates to a fire prevention composition that does not cause the coating film to crack or fall off during combustion, and forms a strong carbonized layer to effectively prevent the spread of fire.

A further object of the present invention is to provide a composition in which the nonflammability is particularly improved by the use of a halide, and which can form a strong carbonized layer when it encounters a fire and combusts.

That is, the present invention contains 10 to 60% by weight of water-emulsified acrylic resin,
Inorganic nonflammable fiber 5-60 weight ratio, inorganic filler 10-4
0% by weight, 5 to 20% by weight of a brominated organic flame retardant, a dehydration carbonization accelerator such as a phosphoric acid ester or a phosphate frit, and 10 to 60% by weight of a hydroxyl-terminated liquid polybutadiene. .

The difference from conventional fire protection compositions is that acrylic resin is used as the main resin and vinyl acetate or ethylene-vinyl copolymer are not used, resulting in an even better binder effect.
The cable coated with the composition of the present invention can be bent at a smaller diameter, and the fire protection composition itself does not crack or crack. .

If the amount of emulsified acrylic resin in water is less than 10% by weight, the flexibility will decrease, and if it exceeds 60mA, the flammable components will increase too much, which may hinder the achievement of flame retardation. Hereditary inheritance is preferred.

This underwater acrylic resin includes butyl acrylate,
Acrylic or methacrylic polymers such as 2-ethylhexyl acrylate and methyl methacrylate, and styrene and acrylic acid.

Copolymerized materials such as acrylonitrile can be used.

In addition, as inorganic nonflammable fibers, there are rock wool, glass fiber, ceramic fiber, etc., and the blend thereof is preferably about 5 to 60% by weight, and if it is less than 5% by weight, the proportion of inorganic content will decrease and the fire will spread. The preventive effect and flexibility are reduced, and if it exceeds 30 Nfa%, the viscosity becomes too high, resulting in poor dispersion in the composition at the manufacturing stage and poor workability in spray application.

The most characteristic feature of the present invention is the use of approximately 5 to 20% by weight of a bromine-based organic flame retardant, which provides complete self-extinguishing properties and prevents corrosion during combustion, such as chlorine-based and phosphoric acid-based flame retardants. compositions can be provided. If the amount of brominated organic flame retardant is less than 5% by weight, self-extinguishing properties will be poor, but if it exceeds 20% by weight, it will be expensive and will generate a large amount of toxic halogen gas when burned. Undesirable.

Inorganic fillers include Irrigation Aluminum, Irrigation Magnesium,
These inorganic fillers, which include silica, talc, clay, zirconium Mate, calcium carbonate, titanium oxide, zinc borate, etc., are added in an amount of about 10 to 40% by weight. 'If the amount of ION is small, the fire spread prevention effect may be insufficient.40
If it exceeds the weight percentage, the flexibility and impact resistance will decrease.

In addition, the present invention uses a dehydration carbonization accelerator such as a phosphoric acid ester or a 7 liter phosphate, and a hydroxyl group-terminated liquid polybutadiene in an amount of about 1
It contains 0 to 60% by weight and constitutes other characteristic compositions.

In addition to improving flame retardancy with brominated flame retardants such as titeca flomodiphenyl ether, ethylene bis-tetrabromophthalimide, and bis-pentabromo phenoxyethane and antimony trioxide, this alone will prevent the fire-retardant composition from burning in the event of a fire. The coating on objects softens and a large amount of pyrolyzed gas from vinyl chloride, polyethylene, etc. used in cables blows out, causing cracks and falling off of the coating, making it impossible to achieve sufficient fire spread prevention effects. For example, even if an attempt was made to prevent the above-mentioned defects by increasing the thickness of the coating film of the fireproofing composition to 6 mm or more, problems such as the time-consuming coating process and poor workability occurred.

As a result of intensive research to overcome this drawback, the inventors of the present invention have found that in addition to improving flame retardancy using the above-mentioned intermediate melting point brominated flameless agent and antimony trioxide, phosphoric acid ester, phosphate 7 liters, etc. The liquid polybutadiene containing a dehydration carbonization accelerator and a terminal hydroxyl group is dehydrated to form a strong carbonization layer during combustion, and as a result, even if the mJM of the fire protection composition is as thin as about 1.5mM, the cable can be We have found a fireproofing composition that does not crack or soften due to the pyrolysis gas of the constituent plastics.

The phosphoric acid esters used here include tricresol phosphate, trioctyl phosphate, and octyl diphenyl phosphate.

Triszochloroglobil-7 phosphate, trichloroethyl phosphate, etc. are applicable, and phosphoric acid frit can also be used in the same way.

Liquid polybutadiene containing a terminal hydroxyl group has excellent water resistance, heat resistance, and acid resistance, and when used in combination with the above-mentioned phosphorus compound, it is effective as a char forming agent in the event of a fire.

That is, the phosphorus compound passes through metaphosphoric acid and polymetaphosphoric acid is generated by heat, and this polymetaphosphoric acid reacts with the terminal hydroxyl group of liquid polycitadiene and is easily dehydrated to form a strong carbonized layer.

If the sum of 7 liters of phosphoric acid ester or phosphate and the hydroxyl group-terminated liquid polygetadiene is less than 1 ON, the ability to form a carbonized layer will be insufficient and a serious problem will arise.

The composition of the present invention can have the same fire-retardant performance as the brominated flame retardant, for example, by using antimony trioxide in combination, but if necessary, additional pigments, film-forming agents, and thickeners may be added. , KAI 101 activator, antifoaming agent.

Preservatives and antifungal agents may also be used.

Next, the results of a comparative test on examples of the present invention and comparative examples will be explained.

Table 1 shows the formulation of each sample, all expressed in parts by weight. Each sample was a uniformly stirred composition.

*2 Polyethylene insulated polyethylene sheath cable
IBBE 383
A vertical tray burn test was conducted.

*3-9 Nosuy 7' Luha CVV 3 CX 5.
5 ml” to a length of 30 m so that the coating thickness after drying is 1.5 mm.

It was applied with a varnish brush and dried in an open air at 80° C. for 6 days.

*3 Flexibility was measured using mandrels with mandrel diameters twice and 10 times the outer diameter of the cable, and by bending the cable 1800 times and reciprocating it twice to observe cracks in the coating.

*4 Water resistance was determined by immersing it in tap water at 40℃ for 10 days, taking it out, and then performing a J-Ko 803004 22 impact test.
Observe cracking and peeling.

*5 Acid resistance is 5% HC1! An impact test is performed after immersion in an aqueous solution at room temperature for 3 days.

*6 Alkali resistance is 5% Na0j (6% in aqueous solution at room temperature)
After immersion for one day, perform an impact test.

*7 Heat resistance is 120℃ in an open setting set to 120℃.
After being heated and aged for a period of time, an impact test is conducted after taking it out.

48 Storage stability is 5 kg After being sealed in a can and left at room temperature for 6 months, phase separation, viscosity change, and coating workability of the paint were measured *9 Coating workability OVV 30 x 5.5 tax2
15 cables were hung vertically for 2 m) and sprayed with paint using a ricin mortar gun (caliber 4) to observe clogging, adhesion to the sheath, speed of drying, etc.

As a result of the above comparative test, Examples 1, 2 and 6 of the present invention were both excellent in preventing the spread of fire; for example, cables coated with Comparative Examples 1 and 2 showed cracks in the coating, and the pyrolysis of polyethylene A blowout was observed that broke through the coating film, and the cable was completely burned, but none of the cables coated with Examples 1, 2, and 6 of the present invention had any cracks or cracks in the coating film. , a strong carbonized layer is formed, and 20
The damage length of the sheath after burning for one minute was 800 to 1.200, and a sufficient fire spread prevention effect was observed.

In addition, although both the examples of the present invention and the comparative examples are satisfactory in terms of water resistance, acid resistance, and coating workability, the examples of the present invention are significantly better than the comparative examples in terms of double diameter winding, heat resistance, and storage stability. It was shown to be excellent.

Agent Patent Attorney Mamoru Takeuchi

Claims (1)

[Claims] Emulsified acrylic resin in water, about 10 to 60 generations, inorganic nonflammable fiber, about 6 to 60 generations, inorganic filler, about 10 to 40% by weight, brominated organic S refueling agent, about 5 to 20% by weight, phosphoric acid ester, phosphoric acid A fire protection composition characterized by containing a dehydration carbonization accelerator such as salt frit and about 10 to 60% by weight of liquid polybutadiene containing terminal hydroxyl groups.