Ethylenepropylene copolymer-base composition

FIELD: polymers.

SUBSTANCE: ethylenepropylene copolymer-base composition comprises dicumyl peroxide, bis-(tert.-butylperoxyisopropyl)benzene or 1,1-di-tert.-butylperoxy-3,3,5-trimethylcyclohexane as an organic peroxide and vinyltri-(methoxyethoxy)silane or polyphenylethoxysiloxane as an organosilicon additive. Except for, the composition comprises additionally a vulcanization co-agent taken among the group including low-molecular polybutadiene with the content of 1,2-links 20-80%, trimethylolpropane-trimethacrylate, triallyl cyanurate and quinone dioxime-1,4. Also, the composition comprises stearin, paraffin and zinc oxide. The composition shows high physical-mechanical properties, oil-resistance and dielectric properties. Invention can be used, in particular, in cable industry.

EFFECT: valuable properties of composition.

2 cl, 3 tbl, 8 ex

 

The invention relates to the chemistry of polymers, and more particularly to polymeric compositions based on ethylene-propylene copolymer, and may find application in the manufacture of cables for submersible neftenaliv, chemical and electrical engineering, household appliances, in the manufacture of rubber products as cushioning materials in other areas of the economy.

Known composition based on ethylene-propylene copolymer, a vulcanizing agent (sulfur), sulfur-containing accelerator (TMTD), filler, softener, zinc oxide, 1,4-bis(2'-mercaptobenzthiazole)-piperazine and silicon-containing Supplement regopenkeyexa [ed. mon. The USSR 84931, CL301 3/28, 1979].

This composition contains sulfur and sulfur vulcanization accelerator and cannot be used as insulation metal veins, as it causes the corrosion.

In addition, one of the components of the composition - 1,4-bis(2-mercapto-metrobidazole)-piperazine has a high melting point and therefore non-uniformly distributed in the composition during its manufacture. In the industry currently, this product is not made. This composition does not have oil resistance.

Closest to the proposed compositions based on ethylene-propylene copolym the RA is the composition, contains zinc oxide, sulfur, pedicel peroxide, digidrirovanny kaolin, oligoanalgesia [ed. mon. The USSR 992531, CL308 L 9/00, 1981].

The disadvantage of this composition is that it does not have oil resistance, and oligoanalgesia is a very toxic product, hydrolytically unstable, currently in the industry are not available.

The task consisted in developing a composition having the following combination of properties: high strength, good dielectric characteristics (in the case of insulating rubber) and, most importantly, high oil resistance.

To solve this problem was developed composition based on ethylene-propylene copolymer, zinc oxide, an organic peroxide, a filler, silicon-containing supplements.

When this composition further comprises coagent vulcanization selected from the group comprising low molecular weight polybutadiene with a content of 1,2-units 20-80% (NBCH), trimethylol-propane-trimethacrylate (TPTM), financiacion-1,4 (HDO), treelistener (TAC); as the organic peroxide is used Dicumyl (MAC)peroxide, bis(tertbutyl-phenoxyisopropyl)benzene (Luperox F-40) or 1,1-di tertBUTYLPEROXY 3,3,5 trimethylcyclohexyl (Luperox 231); as a silicon-containing additive is inoltre(methoxy-ethoxy)silane (product And-172) or polyphenylsiloxane-loxin (PFAS) and a filler, selected from the group comprising digidrirovanny kaolin, chalk, micro-talc, silica, carbon black in the following ratio of components (parts by weight):

Ethylene-propylene copolymer100,0
Zinc oxide5,0-20,0
Organic peroxide3,0-15,0
Coagent vulcanization2,0-20,0
Filler100,0-200,0
Stearin0,5-2,0
Paraffin2,0-10,0
Silicon-containing additive0,5-2,0

The composition may also contain 0.5 to 10.0 parts by weight of paraffin and/or

stearin.

As the copolymer can be used as a double-propylene copolymer (qualified electronic signature certificate)and triple ethylenepropylene rubber (Sept).

All components included in the composition, are the products produced in industry or purchased abroad.

Manufacture and processing of the compositions is carried out on standard equipment and does not cause difficulties.

The invention is illustrated by the following examples.

Example

The rubber compositions shown in table 1 (mixture 1-7), is prepared as follows.

On a roll mill at a temperature of rolls 60±5�B0; With resultshowever ethylene-propylene copolymer for 2 minutes, add coagent vulcanization and stirred for 4 minutes Then add the product composition A-172 or PFAS and stirred for 2 min, zinc oxide and stearin with further stirring for 3 minutes, then add the filler and wax. The mixture is stirred for another 15 minutes, then add the peroxide and stirred for 2 min, and then thermostatic under a pressure of 100 ATM in electrophorese at a temperature of 163°C for 40 minutes

td align="center"> 10,0
Table 1

The compositions
The components of the compositionThe amount by mass
1234567Known
SKEPT100100100100100100100
Qualified electronic signature certificate100
Zinc oxide5,05,05,010,20,05,05,06,0
NBCH with the content of 1,2-SV. 80%15,0
NBCH with the content of 1,2-SV. 60%20,0
NBCH with the content of 1,2-SV. 20%20,0
TPTM2,07,0
TAC8,0
HDA10,0
MAC3,03,0
Luperox F-4010,05,08,0
Luperox 23110,015,0
Kaolin digidrirovanny10020010015090
Chalk208050
The micro-talc160
Silicon dioxide20
Carbon black100
Stearin1,51,51,00,51,52,02,0
Paraffin2,05,010,02,05,0/td> 3,02,0
A-1721,01,00,51,5
PFAS2,01,52,0
Sulfur0,35
Oligogenic-disilane4,0

Table 2

Physico-mechanical properties of vulcanizates
IndicatorsSong
1234567Known
Conditional tensile strength, MPa9,09,28,37,88,98,010,87,6
Elongation RA is the gap, %160150210250110120130500
The change in weight after swelling in the industrial oil at 100°24 h, %3532405525303085

Table 3

The dielectric characteristics of the vulcanizates
IndicatorsThe wetting time at 20°With the daySong
123456Known
Specific volume resistance, Ohm·mAbout

7
3.2.10132,3 .10134,0 .10132,5 .10133,2 .10132,7 .10133,0 .10131,0 .10133,5 .10132,7 .10133,7 .10132,0 .10133,0 .10131,0 .1013
The tangent of dielectric loss angle0

7
0,006 0,0080,006 0,0070,005 0,0070,008

0,009
0,007

0,006
0,006 0,0070,0080,009
DK0

7
2,5

2,7
2.4GHz

2,6
2.4GHz

2,6
2,6

2,8
2.4GHz

2,6
2.4GHz

2,6
2,6

2,8
Dielectric strength, MV/m0

7
32,0

29,5
32,1

30,8
31,8

30,5
29,5

28,7
33,2

31,6
31,8

30,2
29,0

28,2

From the results shown in tables 2 and 3, it follows that the compositions based on ethylene-propylene copolymer, containing in its composition coagency vulcanization selected from groups: low molecular weight polybutadiene with a content of 1,2-units 20-80%, trimethylolpropane-trimethacrylate, treelistener, financiacion-1,4; as organic peroxide Dicumyl peroxide, bis(tertbutyl-phenoxyisopropyl)benzene and 1,1-di tertBUTYLPEROXY 3,3,5 trimethylcyclohexyl, fillers and silicone additive vinyltris(methoxyethoxy)silane or polyphenylmethylsiloxane have high oil resistance and durability as compared with the composition of the prototype and retain high dielectric properties.

Thus, the proposed arrangement provides the whole complex of properties: high physical-mechanical the indicators, dielectric properties and oil resistance.

1. Composition based on ethylene-propylene copolymer containing zinc oxide, organic peroxide, a filler, a silicone additive, characterized in that it further comprises coagent vulcanization selected from the group comprising low molecular weight polybutadiene with a content of 1,2-units 20-80%, trimethylolpropane-trimethacrylate, treelistener, financiacion-1,4; as organic peroxide Dicumyl peroxide, bis(tertbutyl-phenoxyisopropyl)benzene and 1,1-di tertBUTYLPEROXY-3,3,5-trimethylcyclohexane, a filler selected from the group comprising digidrirovanny kaolin, chalk, micro-talc, silica, carbon black, and as silicone additives - vinyltris(methoxyethoxy)silane or polyphenylmethylsiloxane in the following ratio of components, parts by weight:

0,5-2,0
Ethylene-propylene copolymer100,0
Zinc oxide5,0-20,0
Coagent vulcanization2,0-20,0
Organic peroxide3,0-15,0
Filler100,0-200,0
Stearin0,5-2,0
Paraffin2,0-10,0
Silicone additive

2. The composition according to claim 1, characterized in that it additionally contains stearin and/or paraffin in the amount of 0.5 to 10.0 parts by weight of



 

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