Insulating composition

 

(57) Abstract:

The invention relates to a cable technique, namely, halogen-free polymer composition for insulation and sheath of cables. The composition comprises, in wt.%: The alumina trihydrate 50-70, phenol-formaldehyde Novolac resin 1-4, zinc borate 2-5, polyethylene wax 2-5, Polybond 2-5, Irganox 1330 0.05 To 2, Irganox MD 1024 0.1 to 0.5, a copolymer of ethylene with vinyl acetate - rest. The technical result is an improvement of the mechanical characteristics and resistance to the action of copper ions. table 2.

The invention relates to the field of electrical engineering, namely, cable technology, and can be used for the manufacture of insulation and sheath of different types of cables with low Flammability, particularly insulation and sheath power, control, signal block and optical cables.

Currently used in cables with low Flammability PVC insulation (sheath) has satisfactory mechanical and dielectric characteristics, but has the significant disadvantage that in the event of fire out of it toxic, corrosive gases, resulting in the poisoning of people, is associated with the presence in the composition of the PVC halogen - chlorine.

To eliminate this drawback has developed a number of insulating materials that do not contain Halogens. Such materials are compositions based on polyolefins and their copolymers containing as flame retardants, inorganic fillers. Known composition based on a copolymer of ethylene and vinyl acetate containing as flame alumina trihydrate (U.S. patent No. 3832326, CL 260-42.29, 1974). This composition during combustion does not emit corrosive and toxic gases, but it does not meet the Flammability requirements of UL standard 94 to the materials of the class 94V-0. In addition, isolation of the specified composition is not sufficiently resistant to thermal-oxidative aging in contact with a copper core or screen.

The closest of those known to offer the technical essence is electrically insulating composition containing (wt.%): a copolymer of ethylene with vinyl acetate 28,5-50 and a filler composed of a mixture 1:1 of the three-hydrate of aluminum oxide and zinc borate - rest (U.S. patent No. 4575184, CL 350/96.23, 1986).

The disadvantage of this composition are low mechanical characteristics (tensile strength). In addition the task consisted in the development of electrical insulating composition, do not emit combustion corrosive and toxic gases, which combines high mechanical characteristics and resistance with improved resistance to thermal-oxidative aging when exposed to copper ion.

The technical result is achieved in that the insulating composition comprising a copolymer of ethylene with vinyl acetate, trihydrate alumina - Al(Oh)3, zinc borate, further comprises a Novolac phenol-formaldehyde resin, a polyethylene wax or a polyethylene wax modified with vinyl acetate, high density polyethylene, modified maleic anhydride - Polybond 3009, 1,3,5-trimethyl-2,4,6-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene - Irganox 1330 and benzoylpropionic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-,2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide - Irganox MD1024 in the following ratio, wt.%:

The alumina trihydrate 50-70

Phenol -

Novolac resin 1-4

The zinc borate 2-5

Polyethylene wax

or polyethylene wax

modified with vinyl acetate 2-5

High-density polyethylene,

ptx2">

4-hydroxybenzyl)benzene - Irganox

1330 0,05-0,2

benzoylpropionic acid

3,5-bis(1,1-dimethylethyl)-

4-hydroxy-,2-[3-[3,5-

bis(1,1-dimethylethyl)-4-

hydroxyphenyl]-1-

oxopropyl]hydrazide -

Irganox MD 1024 0,1-0,5

A copolymer of ethylene with

the vinyl acetate Else

The proposed composition comprises known components.

Used a copolymer obtained by copolymerization of ethylene with vinyl acetate Copolymer of ethylene and vinyl acetate is produced by the domestic industry (THE 6-05-1636-97).

The zinc borate is produced GUP “Unichem WITH OZ” on THE 113-07-015-91.

Polyethylene wax is produced by the firm "Clariant", Germany alumina Trihydrate produced by firm "Martinswerk, Germany.

Phenol-formaldehyde Novolac resin is produced by JSC “Carbolite”. Irganox 1330 and Irganox MD 1024 are made by the company Ciba, Switzerland.

The composition according to the invention can be processed on standard equipment used for these purposes in cable production.

The following example illustrates but does not limit the invention.

Example:

5 minutes

From the obtained compositions are prepared standard samples for testing. The compositions 1-7 are given in table. 1.

The compositions are tested for Flammability standard UL-94, resistance to copper by the method of THE 2243-052-05766563-98 and determine their strength and elongation at break according to GOST 11262. The results are given in table. 2.

Test results shows that the proposed composition has high strength and elongation at break and resistance to the action of copper ions and these indicators exceeds the prototype.

Insulating composition comprising a copolymer of ethylene with vinyl acetate, alumina trihydrate, zinc borate, characterized in that it further comprises a Novolac phenol-formaldehyde resin, a polyethylene wax or a polyethylene wax modified with vinyl acetate, high density polyethylene, modified maleic anhydride - Polybond 3009, 1,3,5-trimethyl-2,4,6-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene - Irganox 1330 and benzoylpropionic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-,2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide - Irganox MD 1024 when shadowselena resin 1-4

The zinc borate 2-5

Polyethylene wax

or polyethylene wax, modified

the vinyl acetate 2-5

High-density polyethylene,

Modified maleic

anhydride - Polybond 3009 2-5

1,3,5-Trimethyl-2,4,6-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene - Irganox 1330 0,05-0,2

benzoylpropionic acid

3,5-bis(1,1-dimethylethyl)-

4-hydroxy-,

2-[3-[3,5-bis(1,1-dimethylethyl)-

4-hydroxyphenyl]-1-

oxopropyl]hydrazide -

Irganox MD 1024 0,1-0,5

A copolymer of ethylene

with vinyl acetate Else

 

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