Polymer composition

FIELD: polymer materials.

SUBSTANCE: polymer composition suitable for use in various national economy branches, in particular in cable industry, is constituted by, weight parts: chloroprene rubber or its combination with butadiene-nitrile rubber, 100; zinc oxide as vulcanization agent, 1-5; vulcanization accelerator selected from group: sulfur, thiuram, diphenylguanidine, Captax, or a mixture thereof, 1.0-3.25; vulcanization activator selected from group: magnesium oxide and stearic acid, 3.5-10.0; stabilizer: acetonanyl, diaphene FP, naphtam-2, 2-3; dibutyl phthalate as plasticizer, 10-20; paraffin as antiozonant, 2-8; fillers: carbon black 47-52 and kaolin 5-22; polybutadiene as modifier, 0.1-10.0; and, additionally, alumina trihydrate, 50-60.

EFFECT: enabled preparation of composition showing resistance to flame propagation, low fume evolution, high frost and oil resistance with physico-mechanical characteristics preserved.

2 cl, 3 tbl

 

The invention relates to polymeric compositions that are used as protective shells cable products.

Known compositions based on synthetic rubbers, including as a filler in natural hydrates aluminosilicates: kaolin and bentonite (Koshelev FF and other General technology of rubber. Chemistry, 1978, pp.261).

However, such compositions have a high enough rate of vulcanization, thermal stability and mechanical properties.

Also known compositions in which to accelerate vulcanization and improvement of physico-mechanical characteristics are modified fillers (UK Patent No. 1265898, CLS 1A, epubl; application 59-109541, Japan, Appl. 15.12.82, No. 57-221052, epubl, MKI 08 L 11/00, 08 R 3/22).

However, these compositions do not possess the necessary resistance to spread of flame and have a high degree of smoke when burning.

Known composition with increased resistance on the basis of liquid chloroprene and silicone rubber containing as a filler alumina trihydrate. However, such compositions have insufficient resistance resistance to spread of flame and increased smoke emission during combustion (Application 57-209980, Japan, Saul, No. 56-95115, epubl. MCI 09 To 3/28, From 09 To 3/10).

Closest offer UEMOA composition and which we have adopted for the prototype is the composition, used for cable sheath, based on chloroprene rubber and includes a vulcanization accelerator, a vulcanization activator, thermo stabilizer, antiozonant, vulcanizing agent, a plasticizer, a product of dehydration of bentonite, polymethylsiloxanes liquid (AV. St-in 1048522, N 01 3/28, BI No. 38, 1983, SW VNIIKP).

The disadvantage of this composition is that it has low resistance to flame spread, high smoke emission and does not provide the required frost and oil resistance.

The task consisted in developing composition having improved resistance to flame propagation, low smoke emission, frost and oil resistance while maintaining high physical-mechanical properties.

To solve this problem developed composition based on chloroprene rubber (or its mixture with on BNR rubber containing vulcanizing agent, a vulcanization accelerator, a vulcanization activator, stabilizer, plasticizer, antiozonant, filler, alumina trihydrate and as a modifier of butadiene rubber in the following ratio of components, parts by weight of: rubber - 100; vulcanizing agent 1-5; vulcanization accelerator 1-3,25; a vulcanization activator 3,5-10,0; stabilizer 2-3,0; plasticizer 10-20; antiozonant 2-8; carbon 47-52; kaolin 5-22; rehydrate alumina 50-60; polybutadiene 0.1 to 10.

As use rubber chloroprene rubber (or its mixture with on BNR rubber in the ratio 1:1); as a vulcanizing agent, zinc oxide and accelerator of sulfur vulcanization, thiuram, diphenylguanidine, captax (2-mercaptobenzthiazole); as a vulcanization activator magnesium oxide, stearic acid; as a stabilizer deafen OP (N-isopropyl-N-phenyl-p-phenylenediamine), acetonyl N (polymer of 2,2,4-trimethyl-1,2-dihydroquinoline), naphthas-2(phenyl-β-naphtylamine); as the plasticizer dibutyl phthalate; as antiozonant paraffin.

The proposed composition allows to obtain a polymer coating for electrical cable having improved resistance to flame propagation, low smoke emission, frost and oil resistance while maintaining high physical-mechanical properties.

All components included in the composition, are known and are products produced by domestic or foreign industry. Manufacture and processing of the composition is carried out on standard equipment.

Example 1.

Composition composition is shown in table 1 were manufactured as follows.

On rollers resultatives rubber or mixture of rubbers), introduced polybutadiene, then enter the small sample with 50% of napolnitel and 50% of plasticizer, then enter 50% of plasticizer and 50% filler, at the end of the mixing enter the vulcanizing agent (zinc oxide) and roll the mixture for 1-2 minutes Total time of manufacture of the rubber on the rollers 12-14 minutes

The mode of manufacturing rubber samples for testing: 143°when the pressure in the press 100 psi for 40 minutes

Table 2 shows the physico-mechanical properties of the compositions, their frost - and oil resistance, oxygen index, the coefficient of the smoke.

Table 3 shows the results of tests for resistance to flame propagation in cables made with the shell of the proposed composition.

Tables 1, 2, 3 are listed after the text part of the description.

From the data presented in table 2, it is necessary that the developed composition according to the physical-mechanical properties is at the level of the prototype, and frost and oil resistance, oxygen index, the ratio dimostrazione significantly superior to the composition of the prototype.

Electric cable made of the proposed composition, has passed the test for resistance to flame spread in the beam by category Century trial of the electrical cable exposed to the flame was carried out according to IEC 60332-3-22. The spread of flame on a vertically placed bundles of cables. Category C

The tests were carried out according to the following procedure./p>

Test method cable on flame spread in the beam.

Trial electric cable exposed to the flame is carried out according to IEC 60332-3-22. The spread of flame on a vertically placed bundles of cables. Category C

The test sample consists of several segments of cable length of at least 3.5 m each, selected from one building length. The total number of cable sections in the sample must be such that the total nominal amount of non-metallic materials on the 1 meter sample was 3.5 liters

Sample disassemble and weigh each non-metallic material.

The number of segments in the sample to be tested is calculated by the formula

where V is the volume of non-metallic material, DM3;

Mi is the mass of each non-metallic material, kg;

ρIthe density of each material, kg/DM3;

l is the sample length, m

The calculated number of segments of the cable is fastened to the front side of the ladder one layer with a gap between adjacent segments, equal to half the diameter of the cable, but not more than 20 mm.

The maximum width of the sample for the standard of the stairs shall be 300 mm, and for the wide stairs - 600 mm

The flame is applied for 40 min, after which it must be extinguished.

The magnitude distribution of the flame take on the inu damaged parts. It is measured in meters (with precision up to the second decimal place) from the bottom edge of the burner until the end of charred parts defined as follows.

On the surface of the cable hit a sharp object such as a knife blade. The place is fixed, the change in the elastic surface of the sample on the fragile, consider the end of the charred parts.

For the category In the length of the charred part of the sample, measured from the bottom edge of the burner, should be no more than 2.5 meters

Thus, the developed polymer composition allows to obtain electrical cable with high rates of fire.

Table 3

The spread of flame on a vertically positioned beam cable
IndicatorsTrackNorm IEC 60332-3-22The placeholder
315
The length of the charred portion of the test beam cable, m1,851,93Not more than 2.5More than 2.5

1. Polymer composition comprising rubber, a vulcanizing agent is zinc oxide, a vulcanization accelerator, a vulcanization activator - magnesium oxide is stearic acid, stabilizer, a plasticizer is dibutyl phthalate, antiozonant - paraffin, the filler is carbon black and kaolin, modifier, characterized in that the composition contains as rubber, chloroprene rubber, or a combination of on BNR rubber, as an accelerator of vulcanization accelerator selected from the group of sulfur, thiuram, diphenylguanidine, captax or a combination thereof, as a stabilizer - acetonyl, deafen OP, naphthas-2 as a modifier - polybutadiene and additionally contains alumina trihydrate in the following ratio of components, parts by weight:

Rubber100,0
Vulcanizing agent1,0-5,0
The vulcanization accelerator1,0-3,25
The vulcanization activator3,5-10,0
Stabilizer2,0-3,0
The plasticizer10,0-20,0
Antiozonant2,0-8,0
Carbon47,0-52,0
Kaolina 5.0 to 22.0
The alumina trihydrate50,0-60,0
Polybutadiene0,1-10,0

2. The composition according to claim 1, characterized in that the polychloroprene and on BNR KAU the arms taken in 1:1 ratio.



 

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4 tbl, 1 ex

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