SU958442A1 - Polymeric composition - Google Patents

Description

(54) POLYMER COMPOSITION

one

This invention relates to stabilized polymeric compositions based on styrene copolymers, which may be used to make products that have enhanced heat resistance. Stabilized polymer compositions are known, including styrene copolymers with polybutadiene (impact polystyrenes) or styrene copolymers of acrylonitrile and polybutadiene (ABS copolymers) in which monofenol is used: 2,6-di-tert-butyl-p-cresol 1, phosphorous esters (polygard;) 2.

Such compositions at high temperatures (150-160 s) have a high oxidation rate, which can lead to a decrease in the service life of products from them (see counter, examples 57.and 13).

Closest to the proposed effect and composition is a composition containing the same copolymers of styrene and, as a thermopolymer, an additive of N (i / -3, 5-di-tert-butyl-4-hydroxyphenyl) -propio-3-N-salicylidene-ethylenediamine (phenol 58 H)

However, such a composition is also not sufficiently stable.

The aim of the invention is to observe thermal stability.

This goal is achieved by the fact that a stabilized polymer composition comprising a copolymer of styrene with semi-butadiene or a copolymer of styrene with acrylic acid nitrile

10 and polybutadiene and amine stabilizer, as the latter contains N, N-di-X2-hydroxaphthyl-1-methylene-ethylene diamine (C-747) in the following ratio of components, wt.% G

The copolymer of styrene 99,0-99,7

15

N, N -di- (2-hydroxynaphthyl-1-methylene) -ethylene diamn 0.3-1.0 Thermal stabilizer C-747 represents 20; it is a light yellow crystalline powder with a melting point of 143-144 ° C and has the following structural formula:

25

CHiNH (CHi), 14HCHj

thirty

BUT C-747 is obtained by the interaction of beta-naphthol with formidoldehyde and ethylene leamim in an alcohol medium at boiling for two hours. The yield is 83.2%. C-747 receive in one stage, on the basis of cheap and affordable raw materials. The target product is obtained immediately of high quality and does not require additional purification. Example 1-4, 5-14 (control). In the mortar, the following mixtures are used: composition of the copolymer of styrene Gily styrene with ol-methylstyrene), acrylic acid nitrile, and polybutadiene and

Styrene + oL-methylstyrene6 5

Nitrile Acrylic

24 11 acids

Polybutadiene Same

Styrene54

Nitrile Acrylic

acids28

Polybutadiene18

Styrene-4 mbtilstirolb 5

Nitrile Acrylic

to-ty24

6

Control

7

Control

AT

Control

240 (1bO "C)

1.0

C-747

143 (1600s;

o; 5

747,100 ()

0.3

o; 4

290 (150 ° С)

ionol

45 (160 °;

(prom. J 0,5

b7 (- -J

Poligard 1, About prom. Analog

45 (- -)

0.5

Also

30 - -) in appropriate cases a stabilizing additive. The thermostability of the compositions obtained is determined by the rate of oxygen uptake in the oxidation unit. As a measure of the thermal stability of a composition, conditionally take time (). during which the sample absorbs oxygen in an amount corresponding to a 30 mm change in the oil column pressure (Table 1). In tab. 1 shows the formulation and thermal stability, determined by the rate of absorption of oxygen. ; Table 1

Acrylic acid nitrile28

Polybutadi n 18

13 Checklist Same

14

Examples 15,16-18 (control).

A composition of styrene copolymer with polybutylene and, in appropriate cases, a stabilizing additive; prepared by mixing components. In a ball mill 30 Min.

Standard bars are cast from the resulting composition to determine 93

Styrene

Polybutag

7 C-747 0.3 diene

Also

Phenol 0,3 58

Continued table. one

72 ()

0.4

Ionol

30 {- -) (prom, analog) 0.4 3 (- -)

neither toughness (GOST-4647-697. Samples in the form of standard bars 35 are tested at 80 ° C in an air thermostat. In the aging process, the change in toughness is monitored.

In tab. Figure 2 shows the recipe and thermal stability determined by the change in toughness.

.Table 2

71

79

79

100

53

62

70

100

Polygard 0.5

18

Also

The data table. 1 and 2 show that N, N-di-12-hydroxynaphthyl-1-methylene-ethylene diamine has a heat stabilizing effect, exceeding the effect of the phenol 58 of the prototype and stabilizers used in industry (ionol and polyhard).

As a result of testing the thermal stability of the proposed composition, it was found that the heat stabilizing additive is well combined with the polymer base.

Claims (3)

1. For the UK K1433285 | cl. SIR, pub. 1976 .. 2. Japanese Patent I 22537/67, cl. 25 / N / 321. 3. USSR author's certificate №761515, cl. C 08 L 25/10, 1977 (prototype).