SU378394A1 - STABILIZED COMPOSITION ON THE BASIS OF POLYOLEFINE - Google Patents

Description

one

The invention relates to

to the production of polymeric materials.

Stabilized compositions are known based on a polyolefin and a stabilizing mixture consisting of bis- (2-methyl-5-tert-butyl-4-hydroxyphenyl) monosulfide and organic phosphite. When stabilizing polypropylene intended for fiber and films, it is important that the stabilizer is compatible with the polymer and that uncolored stabilized coating is obtained.

To increase the effectiveness of stabilizer compositions used for polyoleflins, including fibers, especially polypropylene, against thermo-oxidative and photo-oxidative degradation, a mixture of stabilizers consisting of bis- (2methyl-5-tert-butyl -4-hydroxyphenyl) monosulfide (thioalkofen HMH) and the floor of α-diphenylolpropane phenyLphosphoiata with a ratio of the latter and monosulfide of 3: 1 -1: 3.

Wo-H OSbN5

Sbnb

In tab. 1 shows the effectiveness of this mixture in the oxidation of polypropylene at 200 ° C and an oxygen pressure of 200 mm Hg. Art.

Table

ten

Notes: 1. Polyphosphite - 1800 mol. weight. monomerically link - 335 mol. weight. (concentration taken; based on the molecular weight of the monomer).

2. Coloring watered; Era svepla.

From tab. 1 that a mixture of bist- (2-methyl 5-tert-butyl-4-hydroxyphenyl) monosulfide with polydiphenylol propane-propylphosphonate gives a significant synergistic effect. Mix does not paint polypropylene Bol o, not

evaporates when forming a monofilament. Both components of the composition are white powders & different substances and combine well with the polymer.

Thus, the proposed composition

with a small total concentration of stabilizers, it shows high efficiency, does not stain, and stabilizers do not volatilize during the shaping of the fiber.

From polypropylene with the above composition at a total concentration of 0.01, monofilament is obtained. A mixture of stabilizers is introduced into the powdered polymer, and the mixture is mixed and granulated on a screw-type extruder at C. The fiber is molded in a laboratory molding unit at 265-270 ° C. The resulting fiber is stretched 5-6 times the length to 135 ° C. The effectiveness of the composition is determined by the drop in fiber strength after it is heated in air at 150 ° C for 8 hours. Lightfastness is determined on a daylight device with irradiation for 10 days. The results are shown in Table. 2

table 2

The data show that in the presence of stabilizer compositions during monofilament aging for 8 hours. at 150 ° C, its strength remained the original. In the presence of the components separately, the strength decreased during the indicated time. The different efficiencies of the mixtures compared to the efficacy of the components at the same concentration are particularly pronounced.

during aging of the fiber to its destruction, which is important for increasing the durability of polypropylene fabrics. The fiber with additives of the composition, irradiated on a daylight device, lasts only 10% for 10 days. In fiber with the addition of single thiolkofen, BM retains only 70% strength, and without stabilizers, the fiber is destroyed after

1.5 days of irradiation.

- Example 1. A mixture of α-n-thioxidants at a concentration of 0.01 mol / kg (i.e. about 0.4-0.5%) is introduced into the polymer in the usual way. The mixture at this concentration prevents

-polymer from oxidative degradation at 200 ° C and oxygen pressure of 200 mm Hg. Art. for 8 hours, and the polypropylene fiber at 150 ° C in air for 8 hours retains its original strength. Mixture

does not stain the polymer and fiber from the latter.

Example 2. A mixture of thioalcophene PMP with polydiphenylolpropanephenylphosphonate with a total concentration of 0.01 mol / kg

(0.35%) at a ratio of components of 1: 4, respectively, protects the polymer from destruction at 200 ° C and oxygen pressure of 200 mm. Hg Art. within 8 hours, and the strength of the monofilament at 150 ° C in an atmosphere of air

remains unchanged. The polymer retains white color.

Subject and title

A stabilized composition based on tuliolefin and a stabilizing mixture consisting of bms- (2-methyl-5-1ret-butyl-4-hydroxyphenyl) monosulfide and a phosphorotanic compound, characterized in that

In order to obtain unpainted thermostable ylIsiNed polyolefine, as the organophosphorus compound, it is introduced into it polydiphylNylolproroyfenylphosphonate with a ratio of the latter and monosulfide equal to 3: 1-1: 3.