SU1008218A1 - Polymeric composition - Google Patents

Description

This invention relates to polymeric compositions used to produce products of various sizes by extrusion, casting and pressing, in particular, to obtain electrical insulation or sheath of cable products. A known polymer composition for insulating cable products containing low density polyethylene (LDPE) or high density polyethylene (HDPE) and a stabilizer. This composition is widely used in the cable industry to insulate wires and cables 1.. However, this composition is characterized by low processability and when processing it on extrusion automatic lines, it is possible to achieve an extrusion rate of not more than 100 m / min for a composition based on new HDPE and not more than 1000 m / min for a composition based on LDPE. With an increase in the extrusion rate above the indicated values, the surface of the insulation of these compositions becomes rough or does not form a monolithic layer. Also known is a polymer composition based on LDPE or HDPE, containing 15% by weight of polypropylene (PP J D The rate of extrusion is somewhat increased. However, this also reduces physical and mechanical characteristics, in particular, the tensile stress during stretching. Known Composition based on .PNP, including silicone oligomer C 3. The disadvantage of this composition is also low processability. The closest to the proposed technical essence and the effect is 36-7 4.3 wt.% (.100 wt.% PP; 25-55 wt.% (.34-152 wt.) Polyethylene; 0.5-7.0 wt.% (.0.619, 4 wt.h J of siloxane rubber and 0.2-2.0% by weight (0.2-5.5 parts by weight) of stabilizer 4 3. The introduction of siloxane rubber into a composition containing PP and HDPE leads to an increase in impact strength even with negative temperatures. However, no increase in other physicomechanical properties is observed. In addition, due to the presence of such a system of stabilizers as N, N -dir-naphthyl-g "-phenylene-di-amine and tinuvin, to paint this composition in bright colors other than blue are not possible and under the action of heat and light, the color will change dramatically. This composition is processed by all known processing methods: casting, feeding, extrusion and pressing molding. However, the extrusion rates do not exceed 100 m / min, which does not allow its use for processing on high-speed lines. The purpose of the invention is to improve the processability of compositions. The goal is achieved in that the composition containing polyethylene, polypropylene, siloxane rubber and stabilizer contains components in the following ratio, parts by weight: Polyethylene100 Polypropylene 0.5-10.0 Siloxane rubber 0.1-3.0 Stabilizer 0 / 05- 0.8 The composition may contain LDPE with a density of 0.915 - 0.925 g / cm3 and a melt flow rate (MFR) of 0.1 - 3.0 g / 10 min or HDPE with a density of 0.945 - 0.955 g / cm and a melt flow index in the range of 0.5- 3.0 g / 10 min. As polypropylene, a polymer with MFR is used within 0.2–3.5 g / 10 min. High-molecular weight and low-molecular weight rubbers with mol. Mae are used as siloxane rubber. from 12000 to 2 million., for example, of the type SKTVmethylvinylsiloxane with mol.mae. up to 650 thousand and content of vinyl groups of 0.1-2.0 mol.%, type of SKT (Cimethyl vinylphenylsiloxane with mol. mae. up to 750 thousand and content of vinyl groups up to 8 mol.%, type of SKTN - dimethylsiloxane with mol. mae from 12 thousand and viscosity 90 - 1080 from types A, B, C or D of the type SKTST - dimethylstyrenesiloxane from mol% to 1 million with a content of styrene groups up to 10 mol%, etc. As stabilizers for In order to obtain a stable color of the composition, one of the following compounds or a mixture of two or more compounds is used: 2,2-methylene bis (4-methyl-6-tert. buti L-phenol) (bisalkofen BP} i 2,2-methylene-5c (4-methyl-6-o1-methylcyclohexylphenol) (bisalcofen MCP) | bis- (p-phenylaminophenoxy) -dimethylsilane (bisphenamSM) bis f 3-methyl- 5 (o.-methyl-benzyl -2-oxyphenyl sulfide (tialkofen MBP); bis- (2-methyl-5-tert. Butyl-4-oxyphenyl) sulfide (tioalkofen BM); 1,3,5-trimethyl -2, 4,6-three (3, 5-di-tert-butyl-4-hydroxybenzyl-benzene (trialkofen MD) i 2- (3, 5-nitrate-butyl 4-hydroxyphenylpro. pionylhydrazo) -5 -. (3, 5-di-tert, butyl-4-hydroxyphenylethylene) 2,3-d; 1 hydro-1-oxa-3, 4-diaza-2-phosphomene (FLU-13 |; ether 3,5-ditert. Butyl-4-hydroxy-phenyl propionic acid and pentaerythritol (tetraalkophene 2,2-thio-diethyl-bis (h- (g, 5-ditert-butyl-4-hydroxyphenyl) -propionate (feusanzo)) .

The composition may contain carbon black from 0.5 to 3 wt.%.

The compositions of the table. 1) goTOBJRCT as follows.

The BridgeBenbury heavy type mixer is first loaded with LDPE (or HDPE}, then PP, stabilizer and siloxane rubber. Mixed prryz is held at 140-1bb ° C for LDPE-based formulations or 240-250 ° C - for HDPE-based formulations. The mixing time is 15-20 minutes, the resulting mixture is granulated on an extruder at a temperature in the zones within 130200 ° C, the screw speed is 120150 rpm. The material is obtained in the form of granules, which are then used for processing by extrusion. The coloring of the compositions is carried out with polyethylene concentrate 1 different pigments colors containing organic or inorganic pigments or mixtures thereof.

The characteristics of the formulations of the proposed composition, the control composition and the composition of the prototype are determined by the following methods; breaking stress at stretching (dp) H relative elongation at break (br) according to GOST 11262-73 at a deformation rate of 500 mm / min on specimens cut from previously pressed plates; The abrasion resistance of the insulation is determined by the number of double needle strokes under the load of 0.1 kgf. The processability of the composition is evaluated visually by the quality of the insulation surface of a cable product obtained at different isolation rates on extrusion automatic lines.

The resistance of the colored insulation to temperature and light is determined by standard methods.

in tab. 1 shows the compositions of the proposed composition, the control and the composition of the prototype and their characteristics.

Table 1

Polyethylene bottom density; High Density Polyethylene Polypropylene SKTN A A mixture of stabilizers Bisapkofen BP Bisalkofen MCP Bysphenam CM Thioalkofen MBP Tioalkofen BM Trialkofen MD FAU-13 Tetraalkofen PE Phenoean 30 100 100 100 100 0/4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 - - 0.3 3.5 2 0, 3 0.3 Breaking stress at stretching, kgf / cm 230 270 125 128 Elongation at break,% Resistance to analysis, 3

- 0.8

0.05

Continued / abl. one

0.5

3 - 2

0.05

0.05 28. 210 215 260 250 580 605 Destructive stress during stretching,: kgf / cm 255 260 165 160 Relative elongation at 800 600 620 rupture,% Abrasion resistance, number 3540 2060 256 DUAL strokes Resistance to Exposure Vyver-Vyder-Vyde sveta light lasts for a living of 96 hours. Resists resistance to temperature of 100 ° C over a period of 1400 hours. one .

density.

High density polyethylene

Polypropylene

SKTV

SKTN A, SKT: ktst

Continued table.

j

Continuation of table 1

100 100 100 100 100

10 5

0.5 0.5 0.5 0.5 0.1 170 158 165 168 600 585 660 580 0 2580 2 $ 70 2630 2в80 Out-Out-Out-Out-Lived &

Tioalkofen WBIl TIoalkofen BM Trialkofen MD FAU-13

Tetraalcofe PE Phenozan 30 Destructive stress at 170 164 162 tensile strength, kgc / cm Relative 636 650 590 elongation at break,% Resistance to use, 3232 3310 3300 tyranny, number of double strokes Vyder-Vyder-Vyde-live life of light for 96 hours; Temperature resistance for 1400 hours. A mixture of stabilizers: topanope CAj, N-di-fi-n atil-p-phenyl ndiami and. Technological properties of the proposed / th composition, composition-protoCol continuation of table 1

0.25 0.1

0.1

0.05

OD

0.1 154 157 162 660 610 620 630 3270 3310 3250 3280 Exhauster Vyder vydor vydiv-vivazhivayett em em dilaurylthiodipropionat, tinuvin, type and control compositions are presented in the table, 2. as shown in the test data, the introduction LDPE polypropylene is less than 0.5 mAh, and siloxane rubber (ck; less than 0.1 mAh.h. (compositions 3 and 4), as well as the introduction of PP and CK more than 10 and 3 mAh.ch respectively does not lead to increase in br and 6. These characteristics remain at a rather low level. With the introduction of PP and IC above 10 and 3 parts by weight, there is also a poor compatibility of components A similar situation is observed with the introduction of polypropylene and silicone rubber below 0.5 and OD of may (part 6), and higher than 10.0 and 3 parts by weight (composition 7) in HDPE. low isolation x (isolation compositions 3.5 and 6). or due to poor compatibility, the networks are not recycled (compositions 4 and 7). Introduction of polypropylene in the amount of 0.5 - 10 parts by weight and organic rubber 0.1-3, C ma.ch. both in LDPE and HDPE, it leads to an increase in p and € p, as well as in the improvement of abrasion resistance of the insulation of telephone wires. The speed of processing the composition on the basis of HDPE returns up to 500-600 m / min V composition 8-11) | and the composition on the Oenove LDPE - up to 2400-2600 m / min .. The pressure in the head does not exceed 510 kgf / cm2, which reflects better flowability of the composition and, therefore, processability. The composition should be painted in different bright colors for the convenience of mounting products made from it. The brightness of the color, as well as its stability to the action of light and temperature, depends on the type of stabilizer or mixture of stabilizers used. Thus, the proposed composition has a good processability and can be used to isolate live conductors on high-speed automatic extrusion lines.

Claims (1)

POLYMERIC COMPOSITION containing polyethylene, polypropylene, siloxane rubber and a stabilizer, characterized in that, in order to improve processability, it contains components in the following ratio, wt.: Polyethylene Polypropylene Siloxane rubber Stabilizer one hundred 0.5-10.0 0.1-3.0 0.05-0; 8 " SU p »1008218, however, its extrusion speed does not exceed 100 m / min, which does not allow it to be used for processing on high-speed lines. The purpose of the invention is the improvement of recyclable ™ compositions.