Polymer composition for manufacturing electrohydroinsulating material

FIELD: chemistry.

SUBSTANCE: invention relates to polymer composition for manufacturing sealing and electroinsulating materials for production of connection cable envelope. Composition contains low-pressure polyethylene, lubricant buxol as plasticiser and filling agent representing titanium oxide.

EFFECT: composition is characterised by high thermodynamic compatibility of components, which makes it possible to obtain material with high mechanical characteristics and optimal combination of electro- and hydroinsulating properties.

2 tbl

 

The invention relates to sealing and insulating materials for the production of sheath of communication cable, preferably an outer layer of the cable, performs a protective function in the manufacture of products for radio and electrical industry.

Known polymer waterproofing material made from waste - composition [1] using polyethylene obtained from waste material, with a density of not more than 0,940 g/cm3and polyethylene with a density of more 0,940 g/cm3the following composition, wt.%:

the polyethylene obtained from waste
(density of not more than 0,940 g/cm3)30-90
polyethylene (density more 0,940 g/cm3)10-70

The disadvantage of this composition is that used as the main component, the polyethylene obtained from waste, can give coatings with low mechanical properties such as ultimate tensile stress, elongation, resistance to cracking under the influence of environmental conditions compared to the original polymer materials. In addition, the aforementioned layers of the coating can the be degraded appearance mainly because of the formation of defects on their surface, for example, the formation of small agglomerates, which not only impair the appearance and violate the smoothness, but also reduce their mechanical characteristics.

The closest in composition to the inventive polymer composition is a polymer waterproofing material [2], including polyethylene, polyisobutylene, coal tar pitch and softening agent (a product of oxidation of bitumen with a boiling point 360-420°C) of the following composition, wt.%:

polyethylene25
polyisobutylene25
coal high temperature tar pitch30-35
softnerrest

It is designed for sealing protection, so its composition is introduced fillers with waterproofing effectiveness. However, the binder is polyethylene with just 25%, so the strength characteristics it is very low. Another disadvantage of this composition is that its structure is unnecessarily complicated by a large number of fillers.

Object of the invention is the improvement of physico-mechanical, electrical, and waterproofing material properties, chemical resistance and compatible with the value of components based on cheap and available raw materials.

This object is achieved in that the polymer composition for the manufacture of sealing and insulating material contains low-pressure polyethylene, buccal as a plasticizer and a granular filler TiO2(titanium oxide) in the following ratio, wt.%:

low-pressure polyethylene82-86
buccal as softener4-8
granular filler TiO2(titanium oxide)rest

This material is characterized by high thermodynamic compatibility of the components of the composition, which allows you to generate high-quality samples with high mechanical characteristics.

For evaluation of the physico-mechanical properties of the material were prepared by five mixtures, composed of powder of polyethylene (PE) low pressure (20606-012, GOST 16338-70), bulk filler TiO2(titanium oxide) and plasticizer - developed rail lubrication buccal. The initial lubrication:

Additive on the basis of nitrated oil (AKOR-1
GOST 15171)1,0-1,5%
Lithium soap of 12-hydroxystearic acid8,0-12%
Lithium soap of oleic acid5-3,0%
Dialkyldithiophosphate zinc (additive DF-11 and TU 24216-80)4,0-8,0%
Oil oil (a mixture of industrial oils):
And-40 (GOST 2079988-97) made it THE 38.101413;
And a-50 (TU 38.101413-97);
spun oil AU (hydraulic
oil NN according to ISO 6743/4)rest

From each mixture was formed samples by hot pressing at a temperature of 150°C. the compositions of the samples are given in table.1, Physical and mechanical material properties of the claimed composition in comparison with the prototype are given in table.2.

Table 1
TrackContent, wt.% Ultimate tensile strength, MPaWater absorption, %DK
PETiO2proven rail lubrication buccal
18111817,80,0132,70
28311618,80,0112,68
38412419,20,0122,62
48510520,00,012,56
58611318,70,01 to 2.57

From table 1 it is seen that when the content of polyethylene in the amount of less than 81% of the strength characteristics of the material are greatly reduced and increases water absorption.

Table 2
The analyzed parameterMethod research equipmentMeasurementsThe conditions of the experiment
Known materialProposed. material
Ultimate tensile strength, MPaBreaking machine RMU-0.05 GOST 14236-81420,0At a constant strain rate of 50 mm/min
Water absorption, %0,6-1,00,01Extract in distilled water at 20°C for 7 days

Thus, the optimum combination of power and waterproofing properties of the developed material is achieved when the content of polyethylene 82-86%, plasticizer 4-8% and oxide Titus is at rest.

In such compositions, the materials of the proposed compositions are superior to the known strength and water absorption. The ultimate tensile strength of a sample of known composition is not less than 4 MPa, whereas for samples of the proposed composition is 18.7-20.0 MPa, and the water absorption of the proposed composition is less than that of the prototype in more than 60 times.

Developed polymer composite material has a complex technological properties, allowing its processing on standard packaging equipment, good termosvarivaemaya and satisfactory mechanical characteristics. When the plant material can be used proven rail lubrication buccal.

In the generated material at the expense of part of the waste grease additives based nitrated oil AKOR-1, designed to improve protection (conservation) properties of mineral lubricating oils for various purposes and fuels, the principle of combining methods of protecting metal from corrosion as the result of combining both the functions of the barrier and cathodic protection.

Sources of information

1. Patent RU 2327714 cable with a coating layer made from waste / Castellani L., Felicioni A., Peruzzotti F., Albizzati E. (27.08.2008), IPC C08L 23/06, C09D 123/06, H01B 3/44, C08J 1/06, 2008.

2. Inventor's certificate SU 245357 A1 Polymeric material / Provincial I. C. (01.01.1969), IPC C08L 23/06, C08K 11/00, C08L 95/00, 1969, is the prototype.

Polymer composition for the manufacture of electrical insulation material containing polyethylene, plasticizer and filler TiO2, characterized in that the plasticizer contains a lubricant buccal in the following ratio, wt.%:

low-pressure polyethylene82-86
buccal as softener4-8
granular filler is titanium oxiderest



 

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