SU732320A1 - Polymeric composition - Google Patents

Description

This invention relates to the oxidative stabilization of polyethylene. Polymer compositions based on polyethylene and stabilizing additives of thiazole derivatives are known, for example, 2-fensch1-amino-thiazole (4,) -indenone-3 1. However, the stabilizing ability of additives used in these compositions under thermal oxidation conditions is not high enough. In addition, they do not stabilize polyethylene under atmospheric conditions. The purpose of the invention is to increase the resistance of the composition to thermal and photodestruction. The ability to protect polyethylene from thermo-oxidative and photodegradation at the same time is an important advantage of the stabilizer, since in a number of cases, effective thermal oxidation inhibitors contribute to polymer photo-destruction processes. This goal is achieved by the fact that the polymer composition containing polyethylene and 2-phenylaminothiazol- (4.5 l, 2 Vindenone-2, additionally contains calcium metasilicate in the following ratio of components, wt.%:. 2-phenylaminothiazole (4.5: 1, 2) -indenone-30.2 - 0.5 Calcium Metasilicate 5-10 Polyethylene Remaining When the content of calcium metasilicate is more than 5-10% by weight, the latter also exhibits the properties of the filler — the initial properties of polyethylene change significantly (rigidity increases, elasticity decreases and etc.), which is sometimes undesirable. The proposed mixture is 2- Enylaminothiazol- (4,5: l, 2) -indenone-3 with calcium metasilicate possesses synergistic properties. This follows all criteria chosen for assessing the resistance by the method of rolling at 160 ° С and aging at 100 ° С (by time, during which the elongation does not change, i.e., during the induction period, during which the elongation does not decrease by more than 10%, during which the elongation retains a half of its original value; sign3 7323204

residual elongation after 8 h val-1. Assessment of resistance by the method of long

tsevani). The proposed mixture provides rolling at 160 ° С (rotation speed

high resistance to aging of polyethylene rolls 22 and 17 rpm; fraction 130; thermal oxidation gap and photo degradation of 0.2 mm; the amount of mass 100 g). Persistence

Example 1. Resistance of a polymeric composition to oxidative degradation under thermal oxidation conditions. Stabilizer Unstabilized polyethylene A mixture of 0.2-0.4 wt.% 2-phenylaminothiazol- (4.5: 1, 2) -indenone-3 and 5-10 wt.% Calcium metasilicate 2-phenylaminothiazol- (4.5: 1, 2) -indenone-3 Calcium metasilicate 5-10 wt.% A mixture of 0.2-0.4 wt.% 2-fe sulminothiazol- (4.5: 1, 2) -indenone-3 and 5-10 wt.% chalk chalk, 5-10 wt.%. : Stabilizer Mixture OD-0.4 wt.% 2-Fensch1-amino-thiazole (4.5: 1, 2) -indenone-3 and 5-10 wt.% Calcium metasilicate

2-phenylaminothiazol- (4.5: 1, 2) -indenone-3 0.2-0.4 wt.%

Calcium Metasilicate, 5-10. weight.%

A mixture of 0.2-0.4 wt.% 2-fechsaminothiazol- (4.5: 1, 2) -indenone-3 and 5-10 wt.% Chalk

Chalk, 5-W wt.%

Visalkofen BP (22-46), 0.2 wt.%

Phenyl- | 3-naphthylamine (neozone D), 0.2 wt.% Diafen HH, 0.2 wt.%

Nonox WSP, OD wt.% Phosphite P-24, 0.2 wt.%.

5 of the composition is evaluated by the change in the relative elongation at break at a strain rate of 10 mm / min.

Table 1

0.7

less than 0.1 (fragile)

0.4

less than 0.1 (fragile)

0.5

0.8 0.6

0.7

0.4 Time (h), during which the value of elongation does not decrease - does not decrease - it keeps poloet (indukts, with more guilt from the initial period) than by 10% elongation O 1 1 8-1210-14 18-20 12, 5 14 1-21.5-2.5 4-5 34 7 Less than 1 1, t a b l and c a 2 Residual elongation after 8 hours of rolling 1.0 (maintained for 8-12 hours) In the table. 1 and 2 show the induction period, as well as the time during which the elongation does not decrease by more than 10% or retains half of the original elongation for the polyethylene composition with a stabilized mixture of 2-phenylaminothiazole- (4.5: 1, 2) -indenone -3 with calcium metastirate For comparison, the resistance of polyethylene stabilized by other effective stabilizers is also given. From tab. Figure 1 shows that the induction period of this stabilizing mixture is 6–12 times higher than the induction period of each component of the mixture, taken separately, and up to 4 times higher than the induction period obtained by summing the effects of both components. The time during which the elongation values do not decrease by more than 10%, and the time during which the elongation saves half of the initial value for the proposed

mixture, up to 5-6 times higher than each component of the mixture separately and up to 2-3 times higher than the time obtained by summing up the effects of both components. This stabilizing mixture ensures the safety of half of

relative elongation at break at a deforming speed of 10 mm / min.

The results of the evaluation of resistance at 100 ° C of this stabilizing mixture are given in table. 3. initial elongation for IS-20 hours in 1 hour. According to the criterion of 8 hours, the steel on the rolls should follow (Table 2) that this stabilizing mixture ensures that the initial value of the extension remains constant (8–12 hours), and individual the components of this mixture are kept only at a level of 0.1-0.7 from the original. In the case of other known stabilizers (diafen HH, ionox 330, nonox WSP, phosphite P-24), the residual udlsh-gekke is at a level of 0.4-0.7 from the original, i.e. lower than in the case of the dzina mixture. A mixture of 2-phenylaminothiazol- (4.5: 1 2) -indenone-3 with chalk does not possess synergistic properties according to all persistent criteria. 2. Evaluation of resistance when (the form of the samples is a plate with dimensions of 150x150 mm, thickness of 3 mm). The stability of the composition is assessed in its position.

Stabilizer

Unstabilized polyethylene

A mixture of 03-0.4 wt.% 2-phenylaminothiazole (4.5: 1, 2) -1 1 Zdenone-3 and 5-10 wt.% Calcium metasilicate

2-phenylaminothiazol- (4.5: 1, 2) -indenone-3 0.4 wt.%

Calcium metasilicate, 5-10 wt.%

From tab. 3, it is clear that this Ca-abilicent mixture ensures that the relative elongation is kept up to half of the initial component, which is no less than 60 times greater than each component of the mixture, taken separately, and 10 times greater than is obtained by summing Effects of both components. Dp this stabilizing mixture this time. more than 15,000 hours. In the case of known stabilizers (phosphite P-24, bis-alkofen BP, bis-alkofen. Table 3

Time during which half of the original time is kept, h

250

more than 15,000 (experiment continues)

700 800

MCP) at time 13000-17000 h already comes brittleness.

EXAMPLE 2. Resistance of a polymer composition under conditions of the atmosphere: Staresh (photodestruction).

Tests conducted over two years.

Claims (1)

The sample form is a plastint with dimensions of 150x150 mm and a thickness of 1 mm. Samples are exhibited on stands set with the front facing south and inclined to the horizon line at an angle of 45 °. The stability of the composition is determined by the change in the relative elongation at break at a strain rate of 10 mm / min. The addition of a mixture of calcium metasilicate with 2-phenylaminothiazol- (4.5: 1, 2) -indenone-3 provides at least 12 times greater weather resistance for polyethylene (judging by the time during which the value of relative elongation at discharge remains constant) than the additive, 2-phenylaminothiazol- (4-5: 1, 2) -indenone-3 alone or calcium metasilicate alone. In terms of weather resistance, this mixture is not inferior to the well-known light stabilizer, OA benzon. Polymer composition containing polyethylene and 2-phenylaminothiazol- (4.5: 1, 2) -indenone-3 as a stabilizing additive, characterized in that, in order to increase the thermal and photodegradation of the composition, it also contains Calcium metaxylate at the following ratio of components, wt.%: 2-phenylaminothiazole, (4.5 1G2) -indenone-3,0,2 - 0,5 Calcium metasilicate 5-10 Polyethylene Other Sources of information taken into account during the examination 1. Copyright certificate of the USSR No. 487909, cl. C 08 L, 23/06, 1974.