SU810734A1 - Composition for diffusional stabilizing of polyamides - Google Patents

Description

The invention relates to compositions for stabilizing polyamides, namely, compositions of systems for diffusion stabilization.

A known composition for the diffusion stabilization of polyamides containing hydroquinone, glycerin and water 1.

However, this system does not ensure the preservation of the initial mechanical strength of stabilized polyamide products upon prolonged exposure to elevated temperature, which is due to the volatilization of a significant part of the stabilizer from the product.

The purpose of the invention is to preserve the mechanical strength of polyamide products after prolonged heat aging.

This goal is achieved by the fact that the known composition 1 additionally contains hydrogen peroxide in the following ratio of components, weight. including:

Hydroquinone1-10

Glycerin 4-6

Hydrogen peroxide 0.1-0.4

Voda89,6-93,9

Example 1. Polycaproamide film in

30 minutes process the system

containing 89.9 wt. including water, 5.0 wt. h

glycerol, 5.0 weight. h. hydroquinone and

0.1 weight. including hydrogen peroxide at 79 ° C, then heated at for 30 minutes. For comparison, a polycaproamid film is treated in a similar manner.

system conditions that do not contain hydrogen peroxide. The stabilized films are aged in air at 160 ° C for 212 hours. The breaking strength of the films is determined before and after aging (see

table).

As can be seen from the table, the breaking strength of the film stabilized by the proposed method decreases from 8.0 to 6.2 kgf / mm, i.e. it remains at the level of

77.5%, while the tensile strength of the film stabilized by a known method decreases from 8.0 to 4.5 kgf / mm, i.e., it remains at 56.2%. Taki.ch way, the introduction of the known diffusion-stabilizing system of hydrogen peroxide in an amount of 0.1 weight. This allows for more than 10% increase in the degree of retention of the mechanical strength of polyamide films after prolonged heat aging.

Example 2. Polycaproamide film is treated for 30 minutes with a system containing 89.6 wt. including water, 5.0 wt. including glycerol, 5.0 weight. h. hydroquinone and

0.4 weight. including hydrogen peroxide at 70 ° C,

then warmed up at 30 minutes. The tensile strength of the stabilized film before aging is 7.9 kgf / mm, after 212 hours of aging at 160 ° C. B / kg, i.e., it remains at 84.8% of the initial value (see table) .

 Water 90 wt. hours, glycerin 5 wt. hours, hydroquinone 5.0 weight. chg

Example 3. Polycaproamide film is treated for 30 minutes with a system containing 93.9 wt. including water, 5.0 wt. including glycerol, 1.0 weight. including hydroquinone and 0.1 weight. including hydrogen peroxide at 70 ° C, after which the film is heated for 30 minutes at 160 ° C. The breaking strength of the stabilized film before aging is 7.9 kgf / mm, after aging it is 5.9 kgf / mm, i.e., it remains at 74.7% of the initial value (see table).

PRI me R 4. Polycaproamide film is treated for 30 minutes with a system containing 84.9 wt. including water, 5.0 wt. including glycerol, 10.0 weight. including hydroquinone and 0.1 weight. including hydrogen peroxide at 70 ° C, after which the film is heated at 30 minutes. The breaking strength of the stabilized film before aging is

8.2 kgf / mm, after aging - 6.4 kgf / mm, i.e., it remains at 78.0% of its initial value (see table).

Example 5. Polycaproamid film is treated for 30 minutes with a system containing 90.9 wt. including water, 4.0 weight. including glycerol, 5.0 weight. including hydroquinone and 0.1 weight. including hydrogen peroxide at 70 ° C, after which the film is heated at 160 ° C for 30 minutes. The breaking strength of the stabilized film before aging is 8.0 kgf / mm, after aging - 6.1 kgf / mm, i.e., it remains at 76.3% of the initial value (see table).

Example 6. Polycaproamid film is treated for 30 minutes with a system containing 88.9 wt. including water, 6.0 weight. including glycerol, 5.0 weight. including hydroquinone and 0.1 weight. of hydrogen peroxide at Q (fC 30 min. The breaking strength of the stabilized film before aging is 8.0 kgf / mm, after aging - 6.0 kgf / mm, i.e. it remains at 75.0% of the initial values (see table).

Claims (1)

1. Copyright certificate USSR № 367181, cl. C 08 L 31/08, 1971.