JPS59135247A - Flame-retardant styrene elastomer composition - Google Patents

Abstract

PURPOSE:To provide a flame-retardant styrene elastomer compsn. which has excellent flame retardance, does not suffer the exudation of flame retarder and has excellent resistance of deterioration by heat, by blending a fluoroelastomer with a specified block copolymer. CONSTITUTION:A fluoroelastomer is blended with an A-B-A block copolymer (wherein A is polystyrene, B is a polymer obtd. by hydrogenating the unsaturated bonds of polybutadiene or polyisoprene) in such a proportion that the content of the fluoroelastomer accounts for 20wt% or more of the entire quantity of the compsn., thus obtaining the desired flame-retardant styrene elastomer compsn. Examples of the fluoroelastomers are tetrafluoroethylene/propylene copolymer, vinylidene fluoride/hexafluoropropylene copolymer, tetrafluoroethylene/vinylidene fluoride/propylene copolymer, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a styrenic elastomer glue 1] retardant silk composition.

In recent years, thermoplastic elastomers have been attracting attention because they can be processed like plastics, such as urethane elastomers, and yet exhibit rubber-like properties without chemical crosslinking.

In particular, recently developed styrenic elastomers, ie, 8-B-A block copolymers in which A is polystyrene and B is a polymer obtained by adding hydrogen to polybutadiene or polyisoprene to crush unsaturation, Excellent electrical insulation, strong, and heat softening temperature of 160℃
It has a high resistance to heat deterioration and is expected to be developed into insulating sheets, dielectric sheets, desolation sheets, etc. in the future. However, because this material is inherently flammable, its field of application has been limited, despite having the excellent characteristics described above. If it could be made flame retardant, it could be used in a wide variety of fields.

In order to achieve this flame retardancy, the present inventors systematically investigated halogen-based flame retardants containing chlorine and bromine and phosphorus-based flame retardants available on the market.

As a result, it is certainly possible to provide flame retardancy, but on the other hand, there are some problems such as poor dispersion, deterioration of electrical and mechanical properties, and surface seepage. In fact, in the spring, when it comes to sewage, in a short period of time it's a big charcoal worker.
According to the evaluation of 9 for K 7m long oil, Table 1 shows no seeping! ! 19. I haven't been able to find any fuel.

This seepage through the surface may lead to a decrease in flame retardancy - ψ], which may cause poor appearance and even have a negative impact on other objects,
1 □ Demand goodness.

As a material that does not seep out, it is possible to blend flammable polymers such as chlorine-containing Zururi 1] [] Blend rubber, chlorinated poly-[-dylene, etc.]. In some cases, the heat resistant sprouting property should be increased by 1, □
・.

The above-mentioned Sujiren series-l Las 1~? 1. The original 1.0 heat deterioration resistance is lost9. The present invention has been made based on the above, and is a styrene-based elastomer that does not seep out of flame retardant and has excellent deterioration resistance and excellent flame resistance. Composition];

In other words, the composition of the present invention comprises an A-F3-block copolymer (where A is polystyrene and B is a polymer obtained by adding hydrogen to polybutadiene or polyisoprene to eliminate unsaturation). It is a blend of fluorine-containing elastomer and has the following characteristics:1. The content of the fluorine-containing elastomer in this blend is 2.0 weight and 1 weight.
% or more.

In the present invention, the mill fluoroelastomer is not particularly limited to conventionally known or well-known ones, and a wide variety of fluoroelastomers are exemplified. For example, De1
-Lafluoroedylene-brobylene JL polymer, vinylidene fluoride-hequinafluoride propene copolymer,
Vinylidene fluoride-taloro-1 to fluoro, ethylene-based copolymers, vinylidene fluoride-pen-unol-butyl-[1-ben-based copolymers, borinyl Δroalkynoly-containing acrylate elastomers, polyphenyls, polysiloxanes containing fluoroalkyl groups Elastomer, vinylidene-propylene yarn copolymer containing tetrafluoroethylene, tetrafluoroethylene-]nidylene-isobutylene copolymer, ethylene-hexafluoroethylene-propylene copolymer, tetrafluoroethylene Examples include tetrafluoro[]goblene-ethyl vinyl ether copolymers, fluorine-containing phosphonitrile COLESTO 7~, detrafluor sub' I-I, and U-dylene-fluorovinyl ether copolymers. Among them, a tetrafluoroethylene-propylene copolymer is preferred from the viewpoint of electrical insulation.

Tetrafluoroethylene copolymers suitable as fluorine-containing elastomers are pyrene-based copolymers. , isobutylene, agrilic acid and its alkylnisdales, methacrylic acid and its alkylnisdales, vinyl fluoride, vinylidene fluoride, hexyl-fluor-A lopropene, chloroethyl vinyl ether, 11 II l-lyfur-1-loethylene, It may also contain a suitable amount of perfluoroalkyl vinyl ether, etc. In the dark copolymer, the molar ratio of -c1 detrafluoroethylene/propylene contained is 9515 to 30/70, especially 90/70. 10
It is preferable to select from the range of ~/l 5/55 from the viewpoint of heat resistance, moldability, etc. Also, the content of components other than the main component that may be added as appropriate is usually 50 mol% or less, particularly 30 mol %. It is preferable to select from a range of % or less.

The blending amount of the fluorine-containing elastomer 1-mer must cover at least 20 major factors that affect the composition, and must be less than 20 major ω%)^I
C can provide the desired flame retardancy (=J).

In the present invention, it is also possible to use fuel auxiliaries as needed, such as antimony trioxide, aluminum
Examples include li lead and zirconium oxide.

In addition to this, other sushi fuels such as perchlorocyclopentadecane, decaj lomodif 1 may be used within the range that does not cause seepage.
It may also be used in combination with Nilneedel, fillers such as aluminum silicate, magnesium citrate, calcium carbonate, etc., which are used in ordinary gobutsu, oxidation inhibitors, lubricants,
Even if a stabilizer is added, there will be no damage to the skin. Of course, IB
It is also possible to add other polymers, such as polyethylene, to the extent that they are free.

J.J.: Examples of the present invention will be explained in comparison with comparative examples. .

The ingredients shown in Table 1 were mixed in predetermined amounts at 180 DEG C. by MA kneading, and then press-molded into sheets 1 to 2 mm thick under conditions of 180"C for 15 minutes.

I″P regarding the 8-point characteristics of the sheet obtained by hiding
The evaluation results are shown in the lower column of Table 1.

Flammability: Compliant with J15C-3005 3, oozing temperature (120'C x 120 hours and room temperature x 12 hours 0
He did 1~1 Noikuru ('' while releasing 8 Rikizuki and Ci?
It was worth it.

Heat deterioration resistance: sheet heated to 160°C 101. After thermal deterioration, it was bent and the presence or absence of cracks was evaluated.

Table 1 Mouni viscosity M++ alOO℃: ε30 (2) Aku [] Shin 604 (trade name) (3) j, l
A rope rr=10%, Mouni viscosity MS+ 10a'I00
"C: 80 or more, Example J'Li J: As is clear from the comparative examples, the present invention has excellent flame retardant properties, no exudation of flame retardant, and excellent heat deterioration resistance. 41 J of the soubrene-based]-Las 1-mer composition will be used.

3

Claims (1)

[Scope of Claims] 1 A-B-A block copolymer (where △ is polystyrene and B is polybutadiene (Y/I< a polymer made by adding hydrogen to isoprene to create an unsaturated moiety) A highly flammable methylene-based elastomer composition, which is a blend of a fluorine-containing elastomer and characterized in that the content of the fluorine-containing elastomer in the blend is 20% by weight or more. 2. The flame-retardant styrenic elastomer composition according to claim 1, wherein the fluorine-containing elastomer is a tetraful A1 co-styrene copolymer.