JP2885888B2 - Vinyl chloride resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is a vinyl chloride-based material which is flame-retardant, has excellent low-smoke emission, has shelliness upon burning, and has excellent mechanical strength and extrudability. The present invention relates to a resin composition.

[Conventional technology]

In general, vinyl chloride resin compositions are widely used in electric wire coating materials, building materials, daily necessities, etc. because of their excellent flame retardancy. However, since the vinyl chloride resin composition generates a large amount of black smoke during combustion, there is a problem in that evacuation and extinguishing in a fire are hindered. For this reason, research on smoke emission reduction of a vinyl chloride resin composition has recently become active, and reports on patents and the like have increased.

Conventionally, a large amount of an inorganic flame retardant has been reported as a means of reducing the smoke emission of a vinyl chloride resin composition, but their low smoke emission and flame retardancy are low smoke and high flame retardant resins such as fluororesin. , And even at a near level, a material having poor mechanical strength and extrudability and a well-balanced physical property has not been obtained.

[Problems to be Solved by the Invention] The object of the present invention is to provide a vinyl chloride-based material which is excellent in flame retardancy, low smoke generation, and flame retardancy without significantly reducing mechanical strength and extrudability. An object of the present invention is to provide a resin composition.

[Means for solving the problem]

The present invention is based on 100 parts by weight of ethylene-vinyl acetate-vinyl chloride graft copolymer resin, and a metal hydroxide of 10 to 100.
1 to 80 parts by weight of a zinc-based flame retardant, 1 to 80 parts by weight of a molybdenum-based flame retardant, and 1 to 50 parts by weight of another organic / inorganic flame retardant. And a vinyl chloride-based resin composition comprising 1 to 10 parts by weight of a reactive polyfunctional monomer.

The ethylene / vinyl acetate-vinyl chloride graft copolymer resin used in the present invention preferably has a degree of polymerization of a vinyl chloride portion of 1,000 or more and an EVA content of 10% or more. If the degree of polymerization is less than 1000, it is difficult to obtain mechanical strength, and EVA content 1
If it is less than 0%, the amount of smoke generated will increase.

The metal hydroxide used in the present invention is aluminum hydroxide, magnesium hydroxide, calcium hydroxide,
Examples include barium hydroxide and hydrotalcite.
If the amount of the metal hydroxide is less than 10 parts by weight, the effect of controlling smoke is small, and if it is more than 100 parts by weight, the mechanical strength and the extrudability are deteriorated.

Examples of the zinc-based flame retardant used in the present invention include zinc borate, zinc oxide, zinc carbonate, zinc sulfide, and zinc silicate. When the compounding amount of the zinc-based flame retardant is 1 to 80 parts by weight, if it is 80 parts by weight or more, the mechanical strength and the extrudability are deteriorated.

The molybdenum-based flame retardant used in the present invention includes all molybdenum compounds such as molybdenum trioxide and compounds containing core-type molybdenum. If the compounding amount of the molybdenum-based flame retardant is 1 to 80 parts by weight and exceeds 80 parts by weight, the mechanical strength and the extrudability become poor.

Other organic and inorganic flame retardants used in the present invention include chlorine-based flame retardants such as chlorinated paraffin, brominated flame retardants such as decabromodiphenyl ether, and inorganic flame retardants such as antimony trioxide and talc.

In the present invention, when irradiating with an electron beam for the purpose of improving the heat deformation rate and the mechanical strength, a reactive polyfunctional monomer is added. Examples of the reactive polyfunctional monomer include trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, triallyl isocyanurate and the like. The compounding amount is 1 to 10 parts by weight in view of the balance between crosslinking efficiency and general physical properties.

If necessary, the vinyl chloride resin composition of the present invention may further contain a stabilizer, a lubricant, an inorganic filler, an ultraviolet absorber, a plasticizer, a coloring agent, and the like in addition to the above. In particular, a plasticizer may be added as a means for improving the extrudability, but DO is preferably used.
It is desirable to use A or DOS.

〔Example〕

 Hereinafter, an example will be described.

The compositions of Examples (1 to 9) shown in Table 1 were kneaded with a 6-inch roll, and the roll sheet was formed into pellets and pressed to form sheets having a thickness of 1 m / m and 3 m / m. These were evaluated by the method described under Table-1.

The compositions of the comparative examples shown in Table 2 were performed in the same manner as in the examples.

In the examples of Table 1, the extremely high oxygen index and low smoke emission similar to fluororesins, which were not obtained by the conventional vinyl chloride resin composition, shelling property during combustion, mechanical strength, extrudability A composition excellent in the above is obtained.

In the comparative examples shown in Table 2, aluminum hydroxide and molybdenum-based flame retardants alone do not exhibit sufficient flame retardancy alone, and if the flame retardancy is forcibly increased, the mechanical strength decreases. Furthermore, the amount of smoke generated and the shell quality during combustion are insufficient with the PVC base.

[Effects of the Invention] As described above, the vinyl chloride resin composition of the present invention has extremely high flame retardancy, low smoke emission, burning husk, and excellent mechanical strength and extrudability. Therefore, not only the field in which the vinyl chloride resin is used, but also a high flame-retardant low-smoke resin such as a fluororesin can be substituted.

In particular, it is expected that evacuation and extinguishing at the time of fire will be extremely easy by using it as a covering material for electric wires used in buildings.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01B 3/44 H01B 3/44 B

Claims (2)

(57) [Claims] A metal hydroxide is used in an amount of 10 to 100 parts by weight based on 100 parts by weight of an ethylene / vinyl acetate / vinyl chloride graft copolymer resin.
1 to 80 parts by weight of a zinc-based flame retardant, 1 to 80 parts by weight of a molybdenum-based flame retardant, and 1 to 50 parts by weight of another organic / inorganic flame retardant. . 2. A vinyl chloride resin composition comprising the composition according to claim 1 and 1 to 10 parts by weight of a reactive polyfunctional monomer.