SU1165694A1 - Polyvinyl chloride-base compound electric-insulating composition - Google Patents

Abstract

FILLED ELECTROINSULATING COMPOSITION ON THE BASIS OF POLYVINYL CHLORIDE, including ester plasticizer, lead heat stabilizer and filler - hydrophobic calcium carbonate, different 4, -. : i- l lA. t ,, tsh "Ml. I w r Bqi-BHfi-jULU saraaJ so that, in order to increase the degree of filling, thermal stability, specific volume electrical resistance and reduce the melt viscosity of the filled composition, it contains hydrophobic calcium carbonate modified with 3.5–5, 0 wt.% Calcium salt of synthetic fatty acid fraction, and 0.1-0.5 wt.% Diphenylolpropane, in the following ratio of components, May, h: Polyvinyl100 chloride Chloride ester 50-80 fixer: (P Lead Thermostable 3, 0-7, 5 Lysis Modified Hydrophobic carbonate 30-400 calcium 9d U1 3: about 4;

Description

.one ,

This invention relates to highly filled polyvinyl chloride (PVC) compositions that can be used to insulate and sheath wires and cables, as well as other products, for example; whether tone, films, pshangov, etc.

One of the main requirements

presented to the highly filled compositions used in the electrical industry, is a combination of a sufficiently high performance properties of the material volume resistivity (j), heat stabilized. mash (1-) and good processability. Improving the properties of materials during filling is accompanied by a reduction in the cost of materials.

Known filled electrical insulating PVC composite containing 100 math.h. PVC, cu.ch .: plasticizer 20-100j thermal stabilizer 0.1-10; calcium carbonate 0-100; silicon dioxide 0.05-3.0j. diphenylolpropane O, 0005-1, Oj a mixture of calcium stearate and stearic acid 4 (l J.

A composition containing on 100 ma.ch. PVC 50 wt.h. dioctyl sebacate, 5 wt.h. tribasic lead sulfate, 100 wt.h. calcium carbonate, 0.3 wt.h. diphenylolpropane, 2 wt.h. calcium stearate and 2 wt.h. stearic acid, has sufficient melt viscosity but low thermal stability / V 100 min (0.5). This thermal stability is impaired under the conditions of plastic processing and its subsequent operation.

Also known is an electrically insulated plasticized PVC-based composition containing up to 50 wt.h. as a filler. calcium carbonate treated with C 10 fatty acids and their C sodium salts}

Composition containing 100 wt.h. PVC 50 wt.h. calcium carbonate treated with stearic acid or sodium salt of synthetic fatty acids 20

in the amount of 2 wt.%, 50 wt.h. dialkylphthalate and 5, ma.h. triaxial lead sulfate, has a low thermal stability, which means 942

is relatively low compared with an unfilled composition of 0.57, pv at 4,1 ohm-cm.

Closest to the invention in terms of the totality of features and the effect achieved is a filled electrically insulating daone composition on a PVC base containing. 100 wt.h. PVC 50-80 wt.h. plasticizer, 3.0 to 7.5 wt.h. lead stabilizer and 50-300 wt.h. hydrophobic calcium carbonate modified with 3.5-5.0 wt.% calcium stearate Z.

I

The thermal stability of the known filled composition does not change with an increase in the degree of filling. The melt viscosity increases dramatically.

so get material with level

filling more than 300 wt.h. It is not possible due to the impossibility of its processing. In addition, the performance of j at 70C filled with the composition is not enough. high.

The aim of the invention is to increase the degree of filling, thermal stability, specific volume electrical resistance and decrease the melt viscosity of the filled PVC-based electrically insulating composition.

The goal is achieved by the fact that the filled electrically insulating composition based on polyvinyl chloride, including ester plasticizer, lead heat stabilizer and filler - hydrophobic calcium carbonate, contains hydrophobic calcium carbonate as a filler, modified 3.5-5.0 wt.% Calcium salt synthetic fatty acids fraction C - € 20 and 0.1-0.5 wt.% diphenylolpropane, with the following ratio of components, parts by weight: Polyvinyl chloride100 Ester plasticizer50-80 Lead

stabilizer 3.0-7.5 Modified hydrophobic calcium carbonate 30-400 Dioctyl phthalate (DOP), dialkyl phthalate (DAP), dioctyl sebacinate (DOS), etc. are used as the ester layer of the fixer. A lead sulfate is used as a lead stabilizer. (TOSS), dibasic lead phthalate (DOPTS), dibasic lead stearate (DOSS), etc. In order to obtain a hydrophobic calcium carbonate modified with a calcium salt of fatty acids and diphenylolpropane, the latter is dissolved in the melted fatty acid at a BO-BOC. acid fraction C followed by treatment with this melt of calcium carbonate. Example 1. A mixer preheated to BO-UO C is loaded with 100 mas. PVC and 30 ppm of hydrophobic calcium carbonate modified with 3.5 wt.% Calcium salt of synthetic fatty acids and O, 1 may.% Diphenylolpropane C17-Cgv on, and stirred for 8-10 minutes. Then, through the nozzle, in 8-10 minutes, a suspension was heated to 5 ma.h. TOSS at 70 ma.h. DAP, the temperature is raised to 100-120 ° C and stirred for 10-30 minutes. The mixture is cooled with stirring and granulated at the melt temperature 150-1. Examples 2-10. The filled compositions of Example 1 are prepared and tested. Examples 11-29 are given for the composition and properties of the compositions are given in table. 1 and 2. Test specimens were prepared using the roller-presse method. The specific volume electrical resistivity is determined with, in accordance with GOST 6433-71, thermal stability with GOST 140A168, melt viscosity on a constant-pressure capillary viscometer of the type PKB-1 with a capillary of 60 mm length and 3 mm diameter, and freeze-resistant. Bone in accordance with GOST 5960-72 breaking stress and relative elongation according to GOST 11262-68. From the table. 1, it follows that the use of hydrophobic calcium carbonate modified with 3.5–5.0 wt.% Calcium salt of fatty acids of fraction C, and 0, 0.5 wt.% Of diphenylol propane, allows to obtain filled electrical insulating PVC composition with degree of filling up to 400 ma.ch. filler on 100 mach. PVC When the degree of filling is 30-400 mph. hydrophobic calcium carbonate f when it rises to 1, 3–10 ohm-cm, the thermal stability increases by 2–5.7 times in comparison with the unfilled composition, the relative melt viscosity is 1.05-1.88 (Table 1, examples 1 -ten). These indicators are significantly better than those of the known composition for the same degree of filling. By using calcium carbonate modified with 3.5-5.0 wt.% Calcium stearate (known composition), a composition with a filling level of not more than 300 parts by weight can be obtained. filler on 100 mach. PVC, increase when up to 1.2-10 5.2-10 Ohm-cm (when filling 30-300 -mae.4.), Increase the thermal stability of 1.2-1.4 times compared to the unfilled composition. Relative melt viscosity with 1.47-17.3 (examples 11-14). The use of hydrophobic calcium carbonate modified with a mixture of calcium salts of fatty acids and diphenylolpropane in quantities less than 30 mash. on 100 ma.ch. PVC (for example, 20 wt.h.), does not mean to obtain a composition with sufficiently high properties (example 24). With the introduction of the specified filler more than 400 wt. Hours, for example, 450 May, h. (example 25), it is not possible to mold a sample. Modification of calcium carbonate with smaller amounts of the calcium salt of fatty acids and diphenylolpropane does not allow the desired material properties to be achieved (examples 26 and 27 as compared with examples 2-5). Modification of calcium carbonate with large amounts of calcium fatty acid and diphenylopropane does not provide significant advantages in the properties of the composition (examples 28 and 29 in comparison with examples 3 and 10). The addition of diphenylolpropane as an additive to the etetav composition containing calcium carbonate modified with calcium stearate does not give such a high thermal stability and such a low melt viscosity. as in the case of its use as a modifier on the surface of calcium carbonate (example 16 as compared with example 2). When used in the composition of PVC compositions, a mixture of calcium stearate and diphenylolpropane as additives, the properties of such compositions are significantly inferior to the properties of the proposed compositions (examples 17-22, respectively, in comparison with examples 1-5 and 10). A sample with a filling of 300 ma.h., calcium carbonate, containing 5 ma.h. Calcium stearate and O, 5 May diphenylolpropane, cannot be formed (Example 23). In addition to the advantages in the properties of materials, the use of hydrophobic calcium carbonate modified with 20 mixtures of calcium salts of fatty acids and diphenylolpropane, allows you to enter the filler without the independent additives of calcium stearate and diphenylolpropane, which are usually introduced in 25 seconds as a lubricant and antioxidant.

Table 1 makes it possible to exclude from the process of obtaining the stage of dissolving diphenylolpropane and preparing a suspension of calcium stearate. Reducing the melt viscosity of filled PVC compositions by filling calcium carbonate with hydrophobic acid modified with a mixture of calcium salts of fatty acids and diphenylolpropane will allow processing of such compositions under temperature conditions similar to processing unfilled compositions without additional energy consumption. From tab. 2 it follows that the use of a hydrophobic calcium carbonate modified with a mixture of calcium salts of fatty acids C? -Cj and DFP, allows to obtain a material with a level of physicomechanical properties not lower than what is known composition, and with somewhat better properties. than with calcium carbonate, not treated with the modifier.

PVC 100

DOS 50

TOSO 5

SASS Hydrof. 100

4.2-10

5.7

1.15 20.0

PVC 100

DAP 70

TOGO 5

CaCO., Hydrof.

PVC 100

DAP 70

TOSO 5

CaCO Hydrof.

PVC 100

DAP 70

TOSS 5

CaCO, hydrof.

PVC 100

DOS 50

TOSS 5

CASOD Hydro.

PVC 100

DAP 70

DOFTS 7.5

CaCOj Hydrof.

2.4-10

2.48

1.1 14.0

0.32,

1.15

11.7

2.4.10

0.1

1.91.2 8.9

and

6.2 .10

1.58 23.9

12

6.3-10

1.88 37

PVC 100 DOP 70

TOSS 5

CaCOj hydrof.

PVC .100 DAF 70 TOSS 5

SASRH Hydrof. 100

10 PVC 100 DAP 80 TOSS 3

CaCOj hydrof. 200

PVC 100 DAP 70 TOSS 5

CASOd dressing, 30

3.5

PVC 100 DOS 50 TOSS 5

CaCO, sap 100

4.0

2.5

0.1

2.5 1.08 6.2

0.5 2.0-10

1.10 11.8

0.5 6.2. ten

3.2 1.48

7

to

1,2-10

1.2 1.47 1.2

ten

6-10

1.4 2.16

13 PVC 100 DAP 70 TOSS 5

CaCOj hydrof. 100 4

PVC 100 DOS 50 TOSS 5

5.0 CaCOj snapping 300

PVC 100 DOF 70 DOFTS 7.5

CaCO grease 400 5,0 PVC 100.

DOS 50 DOSS 5 CaCO Hydrof. 100 4.0

DFP 0.3 PVC 100

DAP 70

"

TOSS 5 CasOz 30

Calcium stearate 3.5

ten

1,42,1

9. 10

5.2.10

1.3 17.3 16

O It is not possible to form a sample.

1.5 2.10

1g

1-10

0.67 1.5

nineteen

2.7-10 1.15

13

PVC 100 DOS 50 TOSS 5

CaCOE 100 Calcium Stearate 4

DFP 0.3

PVC 100 DAP 70 TOSS 5

CaCOj 100

Calcium Stearate 4

DFP 0.3

20 PVC 100 DAP 70

TOSS 3

Caso 100

Calcium stearate 4 DFP 0.3

21 PVC 100

DAF 70 TOSS 3

CaCO 100

Calcium stearate 4 DFP 0.1

14

1165694 Continuation of the table. one

9,

0.72 .2.86 1.

1,2-10

: 1.36 2.5 1.0

TO

2.7

one.

ten

0.93 2.8

7.3-10 0.3

15

22 PVC 100 DAP 80 TOSS 5

CaCOj 200

Calcium stearate 5 DFP 0,5 PVC 100 DOS 50 TOSS 5

SaSrz 300

Calcium Stearate 5.0 DFP 0.5

PVC 100 DAP 50 TOSS 5

CAS0 Hydrof. 20

5.0

PVC 100 DAP 80 TOSS 5

CaCOj hydrof. 450

sixteen

1165694

Continued table. one

1.23.15

4, 1.48

Could not mold sample.

0.51.7-10

1,31,1

1.7

0.5 Unable to mold a sample

26 PVC 100 DOS 50 TOSS 5

CaCO, gidaof. 100 3

27PVH 100 DAF 70 TOSS 5

CaCO Hydrof. 100 4

28PVH 100 DAF 70 TOSS 5

CaCOj hydrof. 100 4.

29 PVC 100 DAF 80

TOSS 3

CaCOj hydrof. 200 6.5

0.07 Z-IO

1,32,5 4

eleven

1.75 2.0

0.05 1.2-10 7.1

ii

0.6 2.6-10

2.48 1.15 11.2

5,31,3

0,61,3 ..

1,3

Table 2

Claims (1)

A COMPLETED ELECTRIC INSULATION COMPOSITION BASED ON POLYVINYL CHLORIDE, including an ester plasticizer, a lead thermal stabilizer and a filler - hydrophobic calcium carbonate, characterized in that, in order to increase the degree of filling, thermostability, specific volumetric electric melt in the composition and viscosity reduction, contains hydrophobic calcium carbonate, modified 3.5-5.0 wt.% calcium salts of synthetic fatty acids of fraction C _1? -C _go and 0.1-0.5 wt.% Diphenylolpropane, in the following ratio, wt.h: Polyvinyl chloride 100 Ester l * " plastic Mi · ’ fixative 50-80 /A Lead U7 thermostabi- from liser 3.0-7.5 Modify- rounded hydrophobic carbonate calcium 30-400 3d U1 3d Ϊ0> 1165694 2