SU992531A1 - Composition based on ethylene-propylene copolymer - Google Patents

Description

The invention relates to polymer polymers, and more specifically, to polymer compositions based on ethylene-propylene copolymer, and can be used in chemical and electronic engineering, in household appliances, in the manufacture of rubber products as gasket materials and in other areas of national economy.

Known compositions based on ethylene-propylene copolymer, filler, vulcanizing agent and silicone amines 1.

The disadvantage of this composition is the high toxicity of the chemicals, their sharp unpleasant smell. In addition, adding them to the composition of polymer compositions based on ethylene-propylene copolymers leads to a deterioration in the frost resistance of materials, as well as a decrease in dynamic characteristics and, in particular, a decrease in resistance to the effects of repeated deformations.

Also known is a composition based on ethylene-propylene copolymer containing organosilanes 2 as a modifier.

However, due to the high hydrolytic instability, as well as the complexity of the hardware and technological design, increased fire hazard, the production of these compounds, as well as their technical use, is extremely difficult. In addition, the use of these compounds in composites based on ethylene-propylene copolymer does not allow to increase the frost resistance of the Compositions and to obtain rubber that can work for a long time under conditions of dynamic loads.

Closest to the present invention is a composition based on ethylene-propylene copolymer, oxide, zinc, sulfur, dicutisyl peroxide, dehydrated kaolin octaalkyldis lasanum in an amount of 0.1-4.0 wt.h.

The disadvantages of this composition are the low resistance of rubbers to the effects of multidimensional deformation, low tear resistance /

25 and also insufficient frost resistance of the obtained composite materials. In addition, the addition of organosilazane products to the composition of the specified composition does not lead to an increase in the frost resistance of products. The purpose of the invention is to increase the resistance to radar, resistance to repeated compression deformations, as well as frost resistance while maintaining high physicomechanical, dielectric properties, and heat resistance of the composition. --di HgN-where n - 1,2 in the following ratio of components, wt.h .: Echilen-propylene copolymer Zinc oxide 0.3-0.4 Sulfur 2.5-3.5 Dicumyl peroxide Kaolin dehydrated 80-100 ny Oli goanagococlocyl azan with oxyphenylene moieties 1.5-4.0 Example 1. A control with n 1 is added to the control cm 2 based on the ethylene-propylene copolymer on the rolls. The mixture is thermostatic in an electric press for 30 minutes. The composition of the control mixtures and its stemmed are listed in Table. 1 and 2. From presented in tab. 2 re- sults, it follows that compositions containing as organosilicon oligoorganocyclodisilases, including oxyphenylene fragments, have shown tear resistance (l / 1, 5 times), cut-resistance-growth (w2 - 2.5 times), frost-resistance coefficient (up to 1.5 times) than the known composition. The decrease in the content of oligoorganiccyclo disilazane with oxyphenylene fragments to 1.0 wt.h. It leads to a composition that has properties at the level known. An increase in the amount of oligomer over 4.0 MAh.h. It does not lead to a further increase in tear resistance, resistance to spreading and frost resistance. Example 2. Composition composition, May. h .: Ethylene-propylene copolymer100 Zinc oxide5.0 Sulfur0.35 Dicumyl peroxide 3.0 The goal is achieved in that the composition based on ethylene-propylene copolymer, zinc oxide, sulfur, dicumyl peroxide, dehydrated kaolin and organosilazane, as the latter contains An oligoorganic cyclo disilazane of the general formula dHj H, .1dHj I-irjr-iNHz, ns. c (JH3 615 Kaolin-dehydrated 80 Oligomer with n 2 1.0-5.0 is prepared as in Example 1. The effect of the amount of oligomer on the resistance to thermal aging is determined ( 120C, 4 days), tearing resistance, multiple deformations of compression, as well as frost resistance. The results are shown in Table 3. As follows from the results presented in Table 3, compositions containing as organosilicon an oligo-organo-cyclo-disilazane containing oxyphenylene fragments containing increased tear resistance, resistance to cut extension and frost resistance compared to the known, while maintaining high resistance to heat aging. Reducing the amount of oligomer in the composition to 1 wt.h. results in a composition that is not different in properties from that known. The increase in the share of oligomer over 4.0 MAH. practically does not lead to a further improvement in the properties of the compositions. Example 3. A composition of composition 3-6 is prepared analogously to example 1. The mixture was incubated in an electric pressure at 155 s for 35 minutes. The change in dielectric indices is determined: specific volume resistance (PV), dielectric constant (), tangent of dielectric loss angle (tgcT), breakdown voltage (Epr) after the samples are softened for 7 days. The test results are shown in Table. 4. From the results, “presented in table. 4, it follows that compositions containing as organosilicon additives of eligoorganocyclo disilazane containing oxyphenylene fragments have good dielectric indices before and in the humus content.

Table 1

MPC zinc oxide (dicumyl peroxide) 4.0 3.7 2.5 Kaolin dehydrati70 80 120 bath 1.0 1.5 2.5 Oligomer with p I

Module at 300% elongation, kgf / cm

Tear resistance., Kg / cm Relative elongation,%

Tear resistance, kgf / cm

Resistance to growth of the cut, ths. Cycles

Coefficient of frost resistance

table 2

68.7 65.0 64.8

71.5 78 480

76 71

73.5

500 400 390

22.8 20.2 13.5 21.5

6.5

6.5 3.0 2.3

Table 3 3.0 3.5 2.5 90 100 100 90 4.0 5.0

13.6 19.0 20.8

4.05.1

2.3

Invention Formula

Composition based on ethylene-propylene copolymer, zinc oxide, sulfur, dicumyl peroxide, dehydrated kaolin and organosilazane, characterized in that, in order to increase the resistance, the continuation of the table. 3

13.5

21,419,5

5.54.8

2.3

It is resistant to the effects of multiple fold deformations and also increases frost resistance while maintaining high physicomechanical, dielectric properties and heat resistance of the composition; it contains organosilazane as oligoorgano65 cyclodisilazane as the following general formula pdH, - | LO (:, H, 0 - $ t Yne J dHa where n 1.2 when following the ratio of components, wt.h .: Ethylene-propylene copolymer100 Zinc oxide 4,0-6,0 Sulfur0.3-0.4 Peroxide dicumyl2.5-3.5 Dehydrated kaolin 80-100 O igoriocyclodisilazan1, 5-4.0% .I1E X f Jl-K j: ir-SiNHz iH, i bi3 (JH, dHa Information sources taken into account when examination 1. USSR author's certificate 443881, class C 08 .F 37/00, 1974. S -2. US patent 3428707, class C 08 L 9/00, 1968. 3. Author's copy of the USSR. 08 F 37/00 ,, 1974 (y) ootype).

Claims (1)

Claim Composition based on ethylene-propylene copolymer, zinc oxide, sulfur, dicumyl peroxide, dehydrated kaolin and organosilazane, characterized in that, in order to increase tear resistance, resistance to multiple deformations _f and also to increase frost resistance while maintaining high physical and mechanical, dielectric properties and heat resistance of the composition, it as an organosilazane contains oligoorgan 65 cyclodisilazane of the following general formula where η = 1.2 at the following time, wt.h .: Ethylene-Propylene Copolymer Zinc Oxide Sulfur Dicumyl Peroxide Dehydrated Kaolin Oligoorganocycloodisilase a component ratio 100 4.0-6.0 0.3-0.4 2.5-3.5 80-100 1,5-4,0 _{Ί 3} en en, pt --jjt-jr-₽l - to έί-AMG .. "({NzN'nz (! _CE CH ₅ yNz