SU487907A1 - Polymer composition - Google Patents

Description

3

Nenin and do not volatilize during processing or under the action of high temperatures do not stain the polymer when the composition is burned.

Bis (kresolcyclohexaioi-3) -disulfides I and and have an effective stabilizing effect and are useful for stabilizing low and high density polyethylene, as well as other polyolefins. The introduction of bis (cresolcyclohexanone-3) -disulfides into the polymer does not cause technological difficulties and can be carried out by roller-rolls or other mixers.

PRI me R. "C- (2-lg-cresolcyclohexacon-3) -disulfide or bass- (2 -" -cresolcyclohexanone-3) disulfide is introduced into the polyethylene in an amount of 0.1-0.3% by weight of the polyethylene. The mixing is carried out in a Beiberi mixer with a capacity of 1800 g, at 130-135 ° C for 4-5 minutes.

The obtained samples of stabilized polyethylene compositions are checked for thermal aging by rolling at 160 ° C on rollers with a friction of 1.2 mm and a gap between the rolls of 0.2 mm, with trimming of the roll fabric. A mass is rolled for 8–16 hours. From the rolled compositions, different times are prepared by pressing samples for mechanical tests, determining the tangent of dielectric loss angle, the rasilav flow index, etc. For comparison, iestabilized polyethylene is rolled in the same way, and ethylated with introduced

imported antioxidant - Santonoxx (2-methyl-5-g / 7g-butyl-4-o-syphenyl) -mono sulfide. The results of changes in the properties of stabilized antioxidant and unstabilized polyethylene in the process of rolling at 160 ° C for 12-16 hours are presented in Table. one.

As you can see nz table. 1, in the case of plastic-stabilized polyethylene, the melt flow index, dielectric loss tangent and other physicomechanical properties change dramatically during rolling already within 4 hours. Samples of low-density and high-density polyethylene compositions stabilized by adding 0.1–0.3% of bi-functional antioxidants I and II in the same conditions retain their initial physicomechanical properties, in particular, elongation, rasilawa index, dielectric loss tangent even after rolling at 160 ° С for e 12-16ch. Anti-oxidant-stabilized I or II-polyethylene does not change color and can be used as an ingredient for the preparation of light-orange formulations.

Changes in the physicomechanical properties of polyethylene and low density (LDPE) and high density (PEVI) iodine by the action of oxygen in the process of rolling

at 160 ° C, stabilized with antioxidites I and II, santoioksom, and unstabilized peTetylene shown in Table. one.

T a b .4 and c a 1

Name of the co.

Mestabilized Illas | PEIP

LDPE + bis- (2-.1 / -cresolcyclohexaio-3) -disulfide

0.1

LDPE-I- (2- / g-cresol cnclohexanone-3) -disulfide

Nestabil | ziri11ny PEVP

LDPE -f b "c- (2-.i-cresolcyclohex 0, 3 RQH-3) - disulfide

In terms of their stabilizing effectiveness, the antioxidants I and II are comparable with industrial antioxidant-santonox. Antioxidant 1 -bis (2-lg-cresolcyclohexaion-3) -disulfide has an advantage over industrial saitonox in that when introduced into polyethylene it provides a lower tangent of dielectric loss angle Z-Yu against 5 saitonox, which is important in the production of polyethylene for electrical engineering .

T and b and U and 2

CiioiicTBa after aging

..in 500 hours

Paimenovaino

And under the PPK lamp, the composition has a tgSlO equal to 20, it does not withstand freezing and frost resistance.

Continued table. one

Stabilized with antioxidant I polyethylene compositions have been tested for light resistance.

The results of these tests are shown in Table. 2

From tab. 2 that the introduction of aptoxdant 1 into polyethylene increases the light resistance of the composition.

The data obtained show that the development of an effective polymeric composition based on polyethylene with the addition of bt1functional antioxidant stabilized against thermal oxidative degradation

bis (2-lg-cresolcyclohexapone-3) - dpsulfide or b; c (2- / g-cresolcyclohexanop-3) - disulfide.

35For the m o

A full-dimensional compound based on polyethylene and a stabilizing additive, characterized in that, in order to increase the stabilization effect, it contains bms {2 -. - iln-2-p-cresolcyclohexaion-3) disulfide as an stabilizing additive, 1-0.5% by weight of polyethylene.