SU406851A1 - STABILIZED POLYETHYLENE COMPOSITION - Google Patents

Description

substances of light yellow color with a molecular weight, so pl. 70-80 ° С, well soluble in aromatic and chlorinated hydrocarbons. Bisarylphenol disulfides I,

II, III, IV have an effective stabilizing effect and are suitable for stabilizing polyolefins of any structure, for example, polypropylene, ethylene-propylene copolymers.

The method of introduction of the proposed stabilizers - bisarylfensldisulfides I, II, III, IV does not cause technological difficulties and can be carried out on rollers or other mixes.

Example. Bisarylphenol disulfides I, I,

III, IV are obtained by the interaction of sulfur monochloride S2C12 with monoaryl-substituted products of phenol and isomeric cresols, dialin (1,2-dihydronaphthalene) in solutions of ether, aromatic and chlorinated hydrocarbons at temperatures of 40-80 ° C and a reaction time of 20-30 hours. The yield is almost quantitative from the equimolar molecular excitations of HCl and monosubstituted products of phenol and isomeric cresols with dialin.

Bisariphenol disulfides I, P, HI, IV introducing the change of the physicomechanical properties of low density polyethylene under the action of oxygen in the process of milling at 160 ° C stabilized with antioxidants I, II, III, IV santonox and

d in high and low pressure polyethylene in an amount of 0.1% by weight of polyethylene. The mixture is carried out in a 1800-gram Banbury mixer at a temperature of 130-135 ° C in

for 4-5 minutes The obtained samples of stabilized polyethylene compositions are checked for thermal aging by rolling at a temperature of 160 ° C on rollers with a friction of 1.2 mm and a gap between the rolls of 0.2 mm. A lot of rolls for 8-16 hours. Mixed at different times, mixtures are prepared by pressing samples to determine the physicomechanical properties and the tangent of dielectric loss angle; simultaneously selected

samples to determine the melt flow index. For comparison, unstabilized polyethylene, as well as polyethylene with the introduced antioxidant-santonox, is rolled in the same way. Results of property changes

in the process of rolling at a temperature of 160 ° C and a time of 12-16 hours of stabilized and unstabilized polyethylene are given in Table. 1 and 2. As can be seen from the table. I and 2, in unstabilized high-pressure polyethylene, the tangent of dielectric loss angle increases by 8 times after 8 hours of rolling, the relative lengthening of the reduction Table 1

unstabilized

Changes in the physicomechanical properties of high-density polyethylene under the action of oxygen in the process of milling at 160 ° C, stabilized with antioxidants I, II, III, IV

table 2