SU827500A1 - Polymeric composition - Google Patents

Description

one

This invention relates to the stabilization of polymer materials, i.e., oleoles.

Stabilizing agents such as ionol, dilauryl thiodipropionate, and mixtures thereof are known, for example, a mixture of dilauralthiodipropionate and topanol OK, used to stabilize polyethylene, polypropylene and other polymeric materials 1.

These compounds are not sufficiently effective under conditions of high-temperature oxidation and, in addition, at sufficiently high concentrations, they are poorly combined with the indicated polyolefins.

The closest among those that are known to the technical essence and the achieved result is a polymer polymer composition containing polyethylene and, as a thermal stabilizer, benzene sulfonylimidobisonic and diethyldithiocarbamic acid (Sulfocarbamine-25) thioanhydride 2.

However, for effective stabilization, significant concentrations of stabilizing additive are required, which, in turn, increases the coloring of the polymer. This has a negative effect on the manufacture of polyethylene films and products that do not require dyeing. In addition, a significant disadvantage of the known composition is that high concentrations of the stabilizer under conditions of high temperatures contribute to the volatilization of the stabilizer and the reduction of its effectiveness during rolling.

The aim of the invention is to increase the resistance of the composition to thermo-oxidative degradation and reduce staining.

This is achieved by the fact that the polymeric composition, including polyethylene and benzenesulfonylimidobenzoic and diethyldithiocarbamic acid thioanhydride, additionally contains quercetin ramnoside glucoside in the following ratio of components, May. %:

Polyethylene 99-99,75

Benzenesulfonylimidobeninolium thioanhydride and diethyldithiocarbamic acid 0.125-0.5

Ramsidosyoglucoside quercetin 0.125-0.5

The total content of the stabilizing additive is 0.25-1 May. % Preferably the ratio of stabilizers is 1: 1. Quercetin ramnesidoglucoside (rutin) compound having the chemical formula

but

OCigHjjOg

OH Oh

It is used as a medicine in medicine. Previously, as a stabilizing additive, it was not used.

The effectiveness of these stabilizers was investigated on powdered high density polyethylene grade 20306-005 and on granular low density polyethylene grade 10702-020.

The invention is explained in the following examples.

Example 1. A stabilizing mixture is introduced into high-density polyethylene in the form of an acetone solution, after which the induction period of oxidation of polyethylene at 160 ° C, PO 760 mm Hg. st

the scavenger is removed by drying. The same stabilizing mixture is introduced into low density polyethylene on rollers at 130 ° C. Films are prepared from the compositions obtained on a hydraulic press with heated plates. 50mg of polymer is cut out from the middle part of the film sample and placed in an oxidizing unit. The oxidation is carried out at 160 ° C and an oxygen pressure of 760 mm Hg. Art.

The components are introduced into high or low density polyethylene in the following ratio, May. %:

Polyethylene 99,75

Sulfocarbamin-250,125

Rutin0,125

Example 2. Carried out analogously to example 1.

Table 1

Po.11 high density ethylene

Without stabilizer Rutin

Sulfocarbamine-25 (prototype)

Sulfocarbamine-25 + rutin (1: 1 ratio)

Dilauryl thiodipropionate + topanol OK (1: 1 ratio) (industrial stabilizing mixture)

Low density polyethylene

Without stabilizer Rutin

Sulfocarbamine-25 (prototype)

Sulfocarbamine-25H-rutin (1: 1 ratio)

Dilauralthiodipropionate + topanol OK (ratio 1 :)) (industrial stabilizing mixture)

The components are introduced into high or low density polyethylene in the following composition, May. %:

Polyethylene 99.5

Sulfocarbamine-250,25

Rutin0.25

Example 3. Carried out analogously to example 1.

Components of the com position are introduced into high or low density polyethylene in the following ratio, May. %:

Polyethylene 99.0

Sulfocarbamine-250,5

Rutin0,5

The effect of stabilizers on the resistance of polyethylene to thermo-oxidative degradation during aging on rollers for 18 hours at 160 ° C

It follows from the above data (see Tables 1, 2) that a mixture of sulfo-carbamine-25 + + rutin at a ratio of 1: 1 exceeds 20 in inhibitory efficiency under the same conditions of testing individual sulfo-carbamine-25, rutin and an industrial mixture of stabilizers. The indicated composition with a sulfo-carbamine-25 2S: rutin ratio of 1: 1 with its addition in the amount of studies on the compositions by the oxidation induction period, which is the most important characteristic of the effectiveness of stabilizing additives, is presented in Table. one.

From the data table. As can be seen in Figure 1, the mixture of sulfocarbamide: n-25 + rutin significantly exceeds sulfocarbamine-25 and industrial stabilizing additive in inhibiting efficacy under the same conditions.

In addition to determining the period of induction of oxidation, the inhibitory effect of the above additives was determined during the thermomechanical degradation of polyethylene on rollers at 160 ° C for 18 h.

The test results are shown in Table. 2

table 2

0.25: 1.0 May. %: in comparison with individual sulphocarbamine-25 does not stain the polymer. The mixture of antioxidants is not washed out with water and aggressive media, it is well combined with the polymer and does not bleed out of it during storage.

Thus, the use of a mixture of sulfo-carbamine-25 and rutin as a stabilizing additive makes it possible to increase the resistance of polyethylenes to thermal-oxidative degradation by an average of 2.5 times in comparison with the industrial mixture: dilaurylthiodIPropionate and tonanol OK and 2.3 times in comparison with nrotothiomy.

Claims (1)

1. Handbook of plastics. Ed. M. I. Garbara et al., Vol. 1, M., Himi, 1969, p. 411. 2 Copyright certificateSSSR No. 263874, cl. C 08L 23/06, 1969 (prototype).