SU395414A1 - STABILIZED COMPOSITION BASED ON POLYETHYLENE - Google Patents

Description

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The invention relates to the industry of polymeric materials that are widely used in traditional households, and can be used to stabilize polyethylene in order to extend the service life of products made from this polymer.

Polyethylene, as well as other polymer materials, is subject to chemical changes by exposure to heat, light, oxygen, and a number of other factors, i.e., it is aging. During aging, the strength of polyethylene decreases, elastic properties are lost, and brittleness increases.

To slow down the aging process, polyethylene is stabilized by the introduction of various additives - stabilizers: Irganox 1010, topanol KA, or its mixture with dilauylthiodipropionate (DLTDP).

To stabilize polyethylene, orthocremnic acid ester, which is the product of the reaction of lt- (tert-butylpheroxy) dichlorosyl with cyclohexanol, di-Cgreg-butylphenoxy) -dicyclohexyloxy-sylone, of the following structure is proposed:

OSbN „I С4Н9СбН4О-Si-ОСбН.

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OSbNN

In an amount of 0.01-3% by weight of the polymer. The stabilizer used in the molecule contains simultaneously cyclohexyloxy-treg-butylphenoxy groups, which impart thermo-light-stabilizing properties to the compound.

The technique is investigated and. As (Polymer, low-density polyethylene grade 2020 T is tested with the following characteristics:

tensile strength, kg / cm

140-148 relative elongation:; no,% 620-640

melt flow index, g / 10 min1.2.

The reference stabilizer is BisalkofenBP-stabilizer 2246. The following 1 mm thick films were made from the samples of stabilization of: unstabilized and unstabilized polyethylene by means of a shrinking method with the following mode: pressing temperature of 180 ° C, specific pressure 200 kgcm-, press time 10-15 min, cooling under pressure up to 40-45 ° С.

The blades were cut out of the compressed films, for which the physical, ico-mechopical and rheological characteristics (GOST 269-53) were determined before and after the accelerated thermal aging of light aging in the weometer (GOST 10226-62).

The mode of the tempo of the warrent and and. Thermal luminosity samples were carried out in an Atlas of the type DM 5-H (USA) with an arc carbon electrode at 60-70 ° and an average intensity of the luminous flux falling to the surface of the stodik during leaking 1000-2400 min, equal to 0.55 ± 0, 05 gcal / cm min.

To maintain the inoBbimeHiHoft moisture in the KaiMepy weather gauge, they were irrigated with distillate water for 8 minutes. After thermal aging, the samples were tested with aa rupture machine RMI-60 according to the following parameters: tensile strength, elongation at rupture (GOST 270-53), as well as melt flow index on the IIRT instrument according to MRTU 6-05-890-64.

The indicated physicomechanical and rheological parameters were determined every 100 hours for 100 hours of heat shrinkage. The test results are given in table. 1-3.

It can be seen from 1NIX that the proposed stabilizer di- (tert-butylenephenoxy) -dicyclohexyloxy-silane is more effective in stabilizing efficiency than the widely used universal stabilizer 2246. The advantage of this stabilizer is that it does not interrogate polyethylene.

Example I (see tab. 1). The breaking strength of polyethylene, stabilized by the introduction of 1% of the standard stabilizer 2246 after 100 hours of heat aging, is reduced by 46.1% (from 167 to 91 kg / cm). The strength of polyethylene stabilized by the introduction of 0.5 and 1% of the proposed stabilizer, under the same aging conditions, even increases by 2.7% (144-148 kg / cm) and .39.5% (119-166 kg / sl ).

Table

PRI m. M 2 (see tab. 2), the relative elongation of the samples, stable, isolated. The introduction of a 20% reduction in 1% stabilizer 2246 after 1000 hours of aging is reduced by 47.5% (from 610 to

When m er 3 (see tab. 3). The melt flow index of polyethylene stabilized with 1% of stabilizer 2246, after 1000 hours of effort, decreases from 1.38 to 0.03 g per

table 2

10 min, i.e., almost 46 times. With the introduction of

polyethylene 15% of the proposed stabilizer

25 melt index; worn after aging decreases

from 1.26 to 0.20 g in 10 minutes, i.e., only 6 times. 320). The relative elongation of polyethylene, stabilized by 0.5% of the proposed stabilizer, under the same aging conditions, changes only by 1 to 15% (from 720 to 612).

Table 3

Thus, the proposed stabilizer di-Cgreg-butylphenoxy) -dicyclohexyloxy and other means less heat (0.5%) stabilizes the polyethylene and exceeds the standard stabilizer 2246 in effect. Besides, it does not color iB polyethylene aging conditions, whereas 2246 stains polyethylene in yellow color.

In tab. 4 shows the results of accelerated aging of a sample of polyethylene, stabilized and 10 min), and for Irtanoks - 1010 - by 90.7%, whereas with the proposed stabilizer only a .7.7% decrease (from 1.23 to 1.11 g in 10 min ).

Thus, these data suggest that the proposed stabilizer exceeds the standard stabilizers NG-2246, Irganox-1010, a mixture of Tonanol KA with DLDTP in many respects.

The proposed stabilizer and industrial stabilizers are Irganox-1010 and the siergetic mixture Topanol KA + DLTDP, on rollers at 160 ° C for 12 hours.

Example 4. The tensile strength of a sample of polyethylene, stabilized with a 0.5% mixture of Topanol 1 A + DLDTP, after 12-hour aging decreases from 144 to 132 kg / cm (8.4%), and for Irganox-1010 from 146 to 101 kg / cm, i.e., by 30.9%, whereas with the introduction of the proposed stabilizer, the tensile strength of polymeipa is increased by 4.1%.

nip and measures 5. The relative elongation (e) of polyethylene stabilized by 0.5% of a mixture of Topanol KA + DLDTP decreases after aging from 690 to 510, i.e. by 26.1%, and Irganox - 1010 - by 76%, then As with the proposed stabilizer, the relative elongation of the polymer is practically non-existent.

Example 6. The melt flow index (/) of polyethylene, stabilized by 0.5% of a mixture of Topanol KA + DLDTP, after 12-hour aging decreases by 63% (from 1.08 to 0.68 g per

Table 4

PRIORITY

25

A stabilizer-iravaina composition based on polyethylene and a stabilizing additive, characterized in that, in order to increase the stabilizing effect, di (tert-butylphenoxy) -dicyclohexyloxy-silane is added to the composition in an amount of 0.1-3% by weight of polymer .