SU1318601A1 - Self-stopping compound - Google Patents

Abstract

This invention relates to self-extinguishing polyethylene-based compositions used to make fire-resistant materials. The invention makes it possible to reduce the migration of antipyrene-bromine-containing; hydrocarbon included in the composition in an amount of 10.0– 20.0 wt.%, And, as a consequence, to maintain the stability of the flame retardant properties due to the content in the composition of 0.3–1.0%. , 0 wt.%: Octamethylcyclotetrasiloxane. The composition also contains 5.0-10.0% by weight of antimony trioxide. 3 tab.

Description

The invention relates to polyethylene-based self-extinguishing compositions that include bromine-containing hydrocarbons as antipyrene, which are used to make non-flammable films, structural products, and the like.

The purpose of the invention is to reduce the migration of the flame retardant during the operation of products at elevated temperatures to maintain the stability of the flame retardant properties.

The octamethyl cyclotetrasiloxane (OMTCS) contained in the composition for reducing the migration of the flame retardant is a low molecular weight substance of the formula

(SVD2.1 0 SSVDg O

 K-1

 i

(CHS 51-0 8TsSNz) 2

RTCM well wets polyethylene, which greatly facilitates its introduction into the composition simultaneously with the introduction of the flame retardants directly in the process of obtaining the material.

Antimony trioxide, brominated aromatic or alicyclic hydrocarbons (, hexabromocyclododecane and decabromobiphenyl oxide) are used as flame retardants.

Additionally, the composition may include a stabilizer (table. 1, examples 2, 6. and 9) and antistatic (table. 1, example 12).

As a stabilizer, for example, topanol can be used in an amount of 0.1 wt.%, And as an antistatic agent, syntamide 5 in an amount of 2.0 wt.%.

As a base, the composition contains low and high density polyethylene.

Example. Compositions, formulations are given in table. 1, is prepared on standard mixing equipment, on a single or twin screw extruder, at 130-1 ° C (depending on the grade of polyethylene) and the resulting composition is granulated. Samples for testing are obtained from the granulate by pressing.

On the obtained samples, the degree of migration of antipyrenes is determined by the gravimetric method and the method of a fire tube — the ability of the material to self-extinguish. A sample is considered self-extinguishing if it lights up after the first ignition, but goes out before reaching the mark applied at a distance of 120 mm from the end of the sample, and after repeated ignition in the quenched part it goes out again without reaching the mark (Table 2).

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Physico-mechanical and dielectric properties are presented in table 3,

Claims (1)

Invention Formula The self-extinguishing composition, including polyethylene, antimony antioxide, is a flame retardant bromine-containing hydrocarbon and an additive that reduces flame retardant migration, which, in order to reduce the flame retardant migration at elevated temperatures to maintain the flame retardant properties during operation, reduces the migration of the flame retardant, contains octamethylcyclotetrasiloxane in the following ratio of components, may.%:. Polyethylene 68,9-84,6 Bromine hydrocarbon 10.0-20.0 Antimony trioxide 5.0-10.0 Octamethylcyclotetrasiloxane 0.3-1.0 Note. PE-polyethylene; HBCD - hexabromocyclododecane; DBDFO - December (l “(i4 eunloch d; GBB — hexaSrombeneEop; OMTSTS– octameclcyclotetrasc oksav; SKD — stereo-regular butadiene rubber; SKI — stereo-regular isoprene SLE — sodium butadiene); ; Snct. - Civamid; 15-19 - samples by a known method. T a 4 l y p «1 Table 2 Saved Is lost Table3