SU605413A1 - Polymer composition - Google Patents

Description

(54) POLYMER COMPOSITION

The film substrate bounded by a glass circle is cast films. For comparison, similar compositions are prepared with Tinuvin II, as well as a polymer film without a stabilizer. The obtained films with a thickness of 70 μm are irradiated with unfiltered UV-light of the G1RK-2 lamp in the air environment.

Accumulation of carbonyl groups (relative units) in impact-resistant polystyrene in the presence of a stabilizer during UV irradiation

During the aging process, samples are taken and the degree of polymer degradation is determined by IR spectroscopy based on the accumulation of carbonyl groups in the 1600–1800 region, preserving the number of double bonds in the 900–100 cm region during UV irradiation,

The results are shown in Table. 1 and 2

Table 1

Preservation of the number of double bonds (% of initial) in the presence of a stabilizer, with UV irradiation in impact resistance

polystyrene Nz dannp: tab. 1 and 2, in the presence of compound C-245, the accumulation of carbonyl groups and the decrease in the number of double bonds in the poly table significantly slows down compared with the unstabilized polymer and polymer stabilized by 65 tinivin P.

Example 2, Samples of high impact polystyrene films in the presence of compound C-245 in an amount, wt.%: 0.2; 0.5; 0.75; and 1.0 is prepared according to the method indicated in Example 1. For comparison, similar 5 are prepared.

compositions with polyhards and strips from the Accumulation of carbonyl in high impact polystyrene in thermal aging (120s) Preservation of the number of double bonds in high impact polystyrene in the presence of thermal aging (120s)

from tab. 3 and 4, it is clear that the compound C-245 is higher than the efficiency; the C-245 slender is highly efficient three times.

thermal stabilizer of impact-resistant. Thus, the proposed soy polystyrene. Co-65 efficiency is characterized by high light and

unstabilized polymer. Films with a thickness of 70 µm are subjected to thermal aging in air, followed by sampling and removal of the IR absorption spectra in the region of 16001800 and 900-1000. The data obtained are given in table. 3 and 4.

Table 3 groups (relative units) in the presence of a stabilizer with Table 4 (% of the initial) stabilizer with a thermostabilizing effect and does not stain the polymer both before aging and during the aging process. In addition to loto, a film of high-impact polystyrene in the presence of C-245 retains its original elasticity during the entire time of light and heat aging. Example 3. A composition is prepared from impact polystyrene and stabilizers in an amount of 0.5% by weight of the polymer. From the obtained composition, films of 30-50 microns thick are prepared by irrigating a 20% benzene polymer solution through a spinneret onto a glass surface. Films are irradiated in an AIPT device under mercury-quartz lamps, followed by sampling and determining changes in the IR absorption spectra. C-245 ICT EFFECT ON THE GROWTH OF CARBONYL GROUPS DURING AGING

high impact polystyrene 0.75 1.68 Without stabilizer - 0.67 1.44. C-2450.5 Polygard 0.5 0.7 1.22 Tinuvin P0 / 3

The data table. 5 shows the high light-stabilizing efficiency 40 of compound C-245, introduced into the polymer in its individual form, equal to the effectiveness of the Tinuvin II blend composition with polyardsm. The polymer film in the presence of compound C-245 during the aging process does not change the initial elasticity and is not colored.

Example 4. Preparing composite materials in the form of standard bars (GOST 7. The effect of C-245 on the stability of impact resistant

69) from high-impact polystyrene and stabilizer. Samples are subjected to a Sweeper

to aging in a veterometer

under coal-arc lamps and the same samples of heat aging at 60 ° С in a thermostat. In the aging process, the change in impact strength was monitored.

The results are presented in Table 6, the absorption spectra of high-impact polystyrene films are recorded on a Hilger two-beam spectrometer, (model 800) in the range of 4000-700 cm. The degree of oxidation is controlled by the rate of formation of carbonyl groups (absorption band 1720 cm). To eliminate the film thickness, the degree of oxidation is evaluated by the ratio of the optical densities of the characteristic absorption band, the intensity of which varies during aging (1720 cm) to the optical density of the polystyrene absorption band ( 1875 cm), the intensity of which remains unchanged. The test results are given in Table 5. Table 5 2.10 2.84 4.49 5.02 7.04 1.76 2.02 2.62 2.94 4.00 1 , 55 1.78 2.78 2.95 4.10 Polystyrene table S-245 has been shown to impart enhanced thermal and light resistance to impact-resistant polystyrene. Samples are not painted during the aging process. -245.The composition is subjected to oxidation at 160 ° at an oxidizing installation recording the oxygen absorption of the material. The drawing shows a plot of the oxidation rate of ABC plastic (STAN-M grade) versus the rhenium thermostat. ; curve 2 - for STAN-M + Tinuvin P + 0.5%; curve 3 is for STAN-M + 0.5% polyhard, curve 4 is for STAN-M + polygard 1% curve 5 is for STAM-M + C-245; Curve STAN-M + C-24 1% The introduction of stabilizer C-245 inhibits the oxidation process (the nature of the oxygen absorption curve 5 indicates that the oxidation process is inhibited)

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Claims (3)

tMi / M Formula of the Invention A polymer composition comprising polystyrene and a stabilizing additive from the class of derivatives 2,2,6,6-tetramethylpiperidine, characterized in that, in order to increase the light and heat stabilizing effect, the composition contains N, mbis (2,2,6,6-tetramethylpiperidyl) ethylene diamine with the following ratio of components, wt.%: Polystyrene 99-99,8 N, N-bis- (2,2,6,6-tetramethylpiperidyl) -ethylene diamine 0, 2-1 Sources of information taken into account in the examination 1. USSR Patent No. 404268, cl. From 08 L 25/06, 1971. 2.Poliplast eplast finforz 1972 ,. 20 No. 179, p. 18-23. 3 .. USSR author's certificate number 433175, cl. From 08 L 25/06, 1971.