SU610843A1 - Polymer composition - Google Patents

Description

(54) POLYMER COMPOSITION

This invention relates to stabilized compositions based on copolymers of styrene with rubber. Such cops of 1pc can be used to obtain products possessing increased resistance to the effect of svvad and heat.

Polymer Cogchs are known, including styrene-polybutadiene copolymers (impact polystyrene), copolymers of styrene, acrylic acid nitrile and polybutadiene (ABS), in which organic compounds such as alkylfecols are used as staples, which are organic compounds such as alkalfecols, Gymptocytes, Zyx, etc. Tiiuvina P J.

However, the known stabilizers from the class of alkylphenols are only heat stabilizers, and the compounds such as benzophenoc and benzotriazole are only light stabilizers.

The closest to the invention in its technical essence is the α-catalytic solution based on a copolymer of styrene (9530 wt.%) With polybutadiene; (5-10% / and thermal luminosity supplement di (4-phenylaminophenyl) carboxyate 4}.

The essential disadvantage of this COMPOSITION 5 is inadequate because of its thermal stability and light stability. In addition, the introduction of di (4-phenylMinophenyl) carbonate as a stabilizer imparts a dark color to the composition, as a result of which the composition can be recommended only for the manufacture of dark colored articles.

The aim of the invention is to increase the thermal and light stability of the composition,

This goal is achieved by the fact that, as a stabilizing additive, the composition contains three (2,2,6,6 tetramethyl - 1 - oxyl-4-piperidium-, oxy) phenyl silane with the following ratio of components, wt. %:

Styrene copolymer

rubber

Stabilizer

As a copolymer of styrene with a rubber garden, take a copolymer of styrene with polybutadiene or a copolymer of styrene, acrylonitrile and polybutadiene.

The styrene component used in the first copolymers can be styrene, alpha-methyl styrene, or mixtures thereof.

The proposed stabilizer has the structure (, c

(L

. J

enz ynz

The synthesis of this compound (tentatively named Lastar 30) is based on available raw materials - 2, 2, .6, b tetramethyl-4-hydroxypiperidine-1 oxyl and phenyltrichloropilane, is carried out at room temperature, and requires complicated instrumentation.

Lastar 30 is a pink powder, m, pl. 1o4 C, mol. Weight 611b “Introduction of Lastar 30 in a concentration above 0.3 weight,% gives the composition a pleasant pink color, which in some cases excludes the use of a dye, in a lower concentration, the introduction of Lastar 30 gives a slightly pink color, which It does not interfere with coloring the composition in bright colors.

To obtain an opaque composition, a filler, titanium dioxide, in an amount of 0.5-1% by weight, by weight of the composition, can be added to its composition.

The introduction of a stabilizer into the composition under the desired conditions can be carried out by mixing in a blended mixer.

In laboratory conditions Lastar

thirty

can be-. introduced into the composition

by mixing in a ball mill or in a copolymer solution,

P, p and m .. r. S. .1-5. A composition is prepared from a styrene copolymer with polybutadiene OR, a styrene copolymer (or a mixture of styrene, cc, methyl styrene), and acrylonitrile. polybutadiene and lysing additives, by mixing the components in a ball mill at room temperature for 30 minutes. The resulting compositions are granulated on a standard screw extruder and standard pieces of 55x6x4 mm are made from a granulated material by means of injection molding.

In order to determine the stability of the bars, the bars made from the proposed composition are exposed in an equator-type weatometer with an irradiation source - coal-arc lamps; samples are taken after 50p100, 200.300 and 500 hours of exposure and the impact strength is determined in accordance with GOST 4647-69, - .

Thermal stability is determined after warming up of standard bars at air temperature | osgate after 500.1000, 2000 and 3000 hours for changing the impact strength of

Light and thermal stability is also determined by the oxidation rate of the composition under UV irradiation under the PRK-2 lamp or heated at 1bO ° C. To carry out such tests, thin (5.0 µm) films are made from a benzene solution of styrene copolymer and stabilizing; supplements. After heating for 1.3, 5 and 10 hours or irradiation for 5.10, 25.50 hours, the amount of carbonyl groups (C-O groups) (absorption bands at 1720 cm) characterizing the rate of oxidation composition.

EXAMPLES. 6–13 (contr.). The experiments were carried out analogously to examples 1-5, the X-ray specimens of the compositions and examples 1-13 are given in table. 1. Results; Tests are presented in Table. 2,

The data table. 2 show that Lastar-30 has a high stabilizing effect, exceeding the effect of the previously recommended stabilizer 4 and stabilizers used in industry. The proposed composition with the addition of Lastar-30 has an increased light and thermal stability.

The thermostability of the compositions with the addition of di (4-phenylaminophenyl) carbonate (see Example 8) was determined by the inaction period of the C – O group and is characterized by the following values of the induction period, min: at - 210, at 225 ° C - 13. Periods, Min, at and 225 ° C compositions on

on the basis of styrene-polybutadiene copolymers without a stabilizing additive and in the presence of trinonylphenyl phosphite, respectively:

At 180 С At 225С Composition

Based on styrene copolymer with polybutadiene 10 4

Composition based on copolymers of styrene with polybutadiene CH- + trinonylfevil phosphite45 9

The stabilizer is well combined with the polymer and after a year does not. migrates.

Products made from this polymer composition are highly stable under conditions of elevated temperatures and ultraviolet irradiation.

Megilstyrol 54,5 Acrylonitrile 24 Polybutadiene 11

Styrene71 Acrylonitrile 22 Polybutadiene 7

Styrene 93 Polybutadiene 7

Styrene 10,5 Methyl styrene 54,5 Acrylonitrile 24 Polybutadiene 11

Styrene 71 Acrylonitrile 22 Polybutadiene 7

Table 1

0.5

0.3

.0,5 0,3

1.0

0.5

Tinuvil P

0.3

Tinuvin P 0.3 Poligard

sch

(fl

a s h o l

m

Claims (4)

1. The patent of France 1343872, cl. Since 08, 1962. 2. The author's certificate of the USSR I 179467, cl. From 08 .L, 25/06, 1964. 3. US patent number 3368997, cl. 260-45.8,1968. 4. USSR author's certificate No. 403699, class, C 08 L 25/06, 1972.