Polyvinyl chloride-based composition for insulation and sheaths of wires and cables

FIELD: chemistry.

SUBSTANCE: invention relates to processing plastic, particularly polyvinyl chloride-based polymer compositions, which are used in various industries, including for making insulation and sheaths of wires and cables. The composition contains 100 pts.wt polyvinyl chloride, 40-80 pts.wt plasticiser, 3-15 pts.wt heat stabiliser and 0.1-8.0 pts.wt filler, which is chemically deposited calcium carbonate with surface treatment with fatty acids with particle size of 15-70 nm.

EFFECT: introduction of said filler into the polyvinyl chloride-based composition reduces viscosity of the molten composition and increases frost-resistance thereof while preserving physical and mechanical properties.

1 tbl, 25 ex

 

The invention relates to the field of plastic processing, in particular, to polymer compositions based on polyvinyl chloride (PVC), which are used for the manufacture of insulation and sheath of wires and cables.

The task consisted in the development of the plasticized compositions based on PVC with improved processability and high frost resistance while maintaining the physical and mechanical properties.

Improvement of processing AIDS was assessed by the reduction in melt viscosity and characterized by relative viscosity, which was calculated as the ratio of the viscosity of the filled composition to unfilled.

The prototype of the present invention is a polyvinyl chloride composition used in the cable industry, containing PVC, plasticizer, stabilizer and filler - white carbon with a specific surface area of 20-40 m2/g in the amount of 2-15 parts per 100 parts PVC (USSR Author's certificate No. 468927, C08F 29/18, publ. 30.04.75 year). The introduction of the PVC composition white black reduces the melt viscosity of the composition while maintaining good physical and mechanical properties. Frost compound contained in the copyright certificate is minus 55 - minus 60°C. copyright testimony melt viscosity at 170°C 1.25·103- 6,3·102P. Playback ocasinogamblingi and test methodologies the disposal of the authors showed that with the introduction of white carbon black in an amount of 2-15 parts by weight per 100 parts by weight of PVC relative viscosity of the composition is 0.74 - 0.87 for, and frost resistance is reduced from minus 65 degrees C to minus 45 to minus 60°C.

The aim of the invention is to reduce the viscosity of the melt plasticized compositions based on PVC and increase frost resistance while maintaining the physical and mechanical properties.

To achieve this goal composition based on PVC, including plasticizer, thermo stabilizer and filler as the latter contains precipitated calcium carbonate with surface processing of fatty acids with a particle size of 15-70 nm in the following ratio of the components of the composition, parts by weight:

PVC100
The plasticizer40-80
Thermo stabilizer3-15
Chemically precipitated carbonate
calcium particle size 15-70 nmof 0.1 to 8.0

As chemically precipitated carbonate with surface processing of fatty acids used Socal 312 V (0 nm) (f. Solvay, Belgium), Shengke - 206 S (40-70 nm), Shengke - 206 T (40-70 nm), Shengke - 505 A (15-30 nm) (f. Shengda Tech Inc, China), Calcium carbonate nanoparticle (75-105 nm) firm PlasmaChem Gmbh and others

As the plasticizer can be used dioctylsebacate (DOS), dioctylphthalate (DOP), trioctyltrimellitate (TOTM) or mixtures thereof and others.

As thermo stabilizer can be used trehosnovnoy sulfate lead (Tossa), dibasic phthalate lead (DFTS), the dibasic lead stearate (DOSS) and other

The composition may further contain a target additives such as antioxidants, lubricants, co-stabilizers, flame retardants, pigments and other

For comparative tests of the prototype used a white soot according to GOST 18307-78 brand BS-30 (60-108 nm).

Below are examples illustrating the invention.

Example 1

In a heated mixer company Henshel of 10 l at 40°C load 100 parts PVC, 5 parts by weight of thermo stabilizer Tossa, of 0.1 parts by weight of precipitated calcium carbonate Socal 312 V, with a particle size of 60 nm, mix to a temperature of 60°C for 15 minutes and Then in a mixer add 50 parts by weight of plasticizer DOS and continue stirring the mixture to a temperature of 100°C for 15 minutes. The mixture is then cooled to room temperature. Powdery mixture of rolls in the mill with oil heating at a temperature of 165°C for 5 minutes On the received samples determined the t frost compounds in accordance with GOST 5960-72 on three samples with a size of 130×10 mm and a thickness of (1±0,1) mm For brittle transition temperature of taking the minimum temperature at which all samples were preserved their integrity at the bend of 180°.

The tensile strength and elongation at break were determined according to GOST 11262-80 at a temperature of (20±2)°C.

The melt viscosity of the compounds were determined using a capillary rheometer "Instron" model 3211 with the diameter of the capillary to 0.127 cm and a length of 2.55 cm at 165°C and shear rate 3,79-1.

The relative viscosity (ηRel) compute the ratio of the viscosity of the filled composition (ηnto unfilled (η0):

ηabouttn=ηnη0

The properties of the compound shown in the table.

Examples No. 2-11 (invention)

The method of obtaining compositions and methods test compounds according to example 1. The composition and properties of the compositions are given in the table.

Example No. 12 (prototype - copyright certificate of the USSR No. 468927)

Examples No. 13-17 (prototype)

The method of obtaining compositions and methods test compounds according to example 1. The composition and properties of the compositions are given in the table.

Examples No. 18-25 (for comparison)

The method of obtaining compositions and methods test compounds according to example 1. Comp is in and the properties of the compositions are given in the table.

From the table it follows that the introduction of the declared plasticized PVC compositions of precipitated calcium carbonate surface-worked fatty acids with a particle size of 15-70 nm in an amount of 0.1 to 8.0 parts by weight per 100 parts by weight of PVC, it is possible to significantly reduce the viscosity of the melt of the composition (the relative viscosity of the melt is 0.48-0,71) and increase frost resistance, which is minus 50°C to minus 70°C. These figures are significantly higher than the prototype shown in the description of the author's certificate of the USSR No. 468927, and received during playback of this invention with the use of 2-15 parts by weight of white carbon black with a particle size of 60-108 nm. The relative viscosity of the melt of the prototype is to 0.71-0.87 for, and frost resistance -45°C To -60°C (see examples No. 1-11 in comparison with No. 12-17).

In the table following examples illustrate the reduction in melt viscosity and increase frost resistance by introduction of nanoparticles (15-70 nm) chemically precipitated calcium carbonate in the compositions containing different plasticizers in different quantities within the declare. Because performance hardiness compound also depend on the selected plasticizer and its amount, it is necessary to compare the examples No. 1 to 7 with No. 1, No. 8 No. 14 No. 9 No. 15 No. 10 No. 16 No. 11 to No. 17. In this comparison it follows that the resistance of the claimed composition is improved in comparison with the prototype at 5-10°C.

The introduction of the claimed composition of precipitated calcium carbonate in the present number, but with a particle size of 75-105 nm and not more greatly reduces the melt viscosity and impairs the resistance of compositions (see example No. 18-23 in CP No. 1-7).

The use of precipitated calcium carbonate with a particle size of 15-70 nm in amounts outside the claimed also not greatly reduces the viscosity of the melt (see examples No. 24-25).

The tensile strength and elongation at break of the inventive compositions comprise a 14.5 to 22.0 MPa and 300-400%, which is at the level of the prototype, where the strength and elongation are 14,0 is 19.7 MPa and 315-370%, respectively.

Composition based on polyvinyl chloride for insulation and sheath of wires and cables, including plasticizer, thermo stabilizer and a filler, wherein the filler it contains precipitated calcium carbonate with surface processing of fatty acids with a particle size of 15-70 nm, in the following ratio of the components of the composition, parts by weight:

polyvinyl chloride100
the plasticizer40-80
thermo stabilizer3-15
precipitated calcium carbonate
with a particle size of 15-70 nmof 0.1 to 8.0



 

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