SU763380A1 - Dispersion for stabilizing polyethylene - Google Patents

Description

one

The invention relates to the production of stabilized compositions based on polyolefins, in particular high pressure polyethylene. It is known that polyethylene, during processing and operation under the influence of various factors, undergoes an oxidizing agent: as a result, it ages, deteriorates a number of its physical and mechanical properties. In this connection, stabilizers are introduced into polyethylene to prevent its premature aging.

Methods are known for preparing stabilizing mixtures by dissolving stabilizers in organic solvents such as benzene, acetone, methanol, ethanol, hydrocarbon resin, low molecular weight polyethylene, other P. 20

A 30% white oil dispersion of the stabilizer Santonox R is known, recommended for use in the production of high-pressure polyethylene 23.25

However, the use of such a dispersion leads to a scattering of the content of extractable substances (oils in the composition and insufficient distribution of the stabilizer. 30

The purpose of the invention is to increase the stabilization effect by increasing the concentration of stabilizing additives in the dispersion and thereby improving the distribution of stabilizers in the mass of polyethylene.

The goal is achieved by the fact that the dispersion for stabilizing polyethylene, consisting of a dispersion medium and stabilizing additives distributed in it, contains HMP-12 naphthenic oil as a dispersion medium, components are taken in the following ratio, wt.%:

Naphthenic oil HMP-12 48-60 Stabilizing agents 40-52 The concentration of stabilizers in the dispersion should be as large as possible and determined by the ability to be transferred by the dosing unit. The minimum concentration is determined by the quality requirements of the compositions on the content of extractables.

An example. Make a composition that is resistant to thermal oxidation aging brand 107-02K according to GOST 16336-70 and compared with the composition obtained using the known dispersion.

The quality indicators of the composition, obtained with a known stabilizing dispersion and proposed, are summarized in the table.

As can be seen, the quality indicators of the obtained composition using the proposed dispersion correspond to the highest grade, and using the known dispersion to the first grade.

in composition 107-02K, the content of the stabilizer Nonox-WSP is determined by GOST 16336-70 and is 0.1 weight L.

Content ksdag40 8

HMP-12 naphthenic oil

52

Example 2. The content of ponent, wt.% Stabilizer:

Nonox

45 9

Topanol OS Naphthenic oil NMR-12

46

Example 3. The content of ponent, wt.%:

Stabilizer:

Nonox50

Topanol OS10

Naphthenic oil

HMP-1240

Density, 9185 0.9183 0.9194 ± 0.0015 feKy4ecTb of the melt, g / 10 min 2il5% 2.1 1.9 12 3.2

5 2

2, 5 2.5

1.2 0.9

and

,

95 101

125 131 550 576. 88 x

J -4j- -h

3-10 2.04-10 1.73-10 2.74 "10 2.68vlO

6.0 3.0 6.0 Ab. No Out 2.5 2.5 2.5

0.6

0.8

0.7

100

100

100

131

130

130

566

569

553 0.9182 0.9183 1.9 2.0

Dielectric

permeability

with frequency

10 Hz

Electrical strength kV / mm

Sort of composition

in the specified dispersion, a Topanol-OS stabilizer is introduced, based on the requirements for the manufacture of the base grade of polyethylene 10702-020 according to the current process regulations. Its concentration in the base grade polyethylene must be 0.02 wt.%.

Claims (2)

1. USSR author's certificate t 424362, cl. From 08 L 25 / 08.20.01.72. 2.Installation of high-pressure polyethylene five 24,000 tons / year. Working draft Developed. Simon Karvz Company (England) under contract 46/22123, 1963 (prototype)