Insulating coating composition

FIELD: chemistry.

SUBSTANCE: there is disclosed insulating coating composition, containing bitumen in amount 90-100 wt fractions, fluorocarbon polymer 32 LN in amount 10-15 wt fractions, butyl acetate in amount 40-45 wt fractions, acetone in amount 40-45 wt fractions and mica in amount 2-3 wt fractions.

EFFECT: improved insulating properties, mechanical strength and chemical stability.

1 tbl, 1 ex

 

The invention relates to methods of making compositions with insulating and waterproofing properties on the surface of the conductive tissues, and can be used in the construction, cable and automotive industries.

Known composition based on synthetic rubber containing a conductive phase-based carbon materials, bitumen bn 90/10, mineral additive is silica sand, industrial oil and synthetic rubbers [U.S. Pat. RU # 2237302, NV 1/20. Composite resistance self-regulating heating material. 2004 Basanavicius S.A., Basanavicius NS]. The disadvantage of this composition are low insulating properties, low thermal stability and adhesion of the coating to the substrate.

Closest to the technical essence and the achievable result, to the proposed composition is a polymer-bitumen composition based on chlorinated polyethylene [U.S. Pat. RU # 2232216, 7 D06N 5/00, WV 11/04 // E04D 5/10. Combined waterproofing coil coating. 2002 Emelyanov PU etc.] the Disadvantage of this composition is low in mechanical strength, water resistance and thermal stability, which does not allow to exploit the coating on the basis of above 100C for a long time, poor adhesion, causing the need for the creation of additional rez the new sublayer. The presence in the composition of chlorinated polyethylene makes unstable electrical insulating properties of the coating, as it quickly breaks down over time. Low maintenance properties of the coatings has led to the formation of additional protective layers of plasticized polyvinyl chloride and corrosion of the enamel. All this makes the coatings of this composition a very tedious process.

The objective of the invention is to increase elektroizoljatsionnyh, waterproofing coating properties, its mechanical strength and chemical resistance, flexibility with simultaneous increase in the efficiency of heat dissipation of the heat from the conductive fabric, and thereby increase its resource usage.

The task is achieved in that in the composition as a polymer matrix is used lacquer PTFE-based brand 32 LN, includes a solvent mixture of butyl acetate and acetone, as well as filler - oil bitumen grades bn 70/30 or bn 90/10 GOST 6617/76 and mica ground GOST 855-74, in the following ratio of components, parts: bitumen 90,0-100,0; PTFE 32 LN 10,0-15,0; butyl acetate 40,0-45,0; acetone 40,0-45,0; mica 2.0 to 3.0.

The use of Teflon brand 32 LF as the polymer matrix has improved thermal stability, electrical insulating properties pokr is ment, elasticity, chemical resistance. This is because PTFE has exceptional resistance to strong mineral acids, peroxides, alkalis, alcohols, aliphatic and some chlorinated solvents, hydraulic fluids, silicone oils and greases. Introduction bitumen and mica in the composition provides high adhesion and abrasion resistant coatings, so there is no need to form additional rubber substrate and protective layers, which greatly simplifies the technology of coating.

The novelty in the present invention is the use in the composition as the porous matrix of polytetrafluoroethylene brand 32 LN, possessing high insulating properties and which allowed to obtain a coating with a high tensile strength, while maintaining the basic performance properties (heat capacity and electrical insulation), as the relative elongation is 600 -800%, and tensile strength tensile 21-42 kgf/see Fluoroplastic 32 LN retains its amorphous structure even at - 40C, that is elastic over a wide temperature range. PTFE 32 LN - copolymer of triptoreline with vinylidenefluoride. Krupnotsvetny white powder, non-toxic.

The composition was prepared as follows: 100 g of bitumen melt marks the N 70/30 and 6N 90/10 under continuous stirring was added varnish PTFE-based brand 32 LN, includes a solvent mixture of butyl acetate and acetone and ground mica. Then within 30 minutes the composition was stirred, maintaining the temperature of the melt constant (100C).

For experimental verification of the proposed compositions were obtained coating method heterologously on a conductive graphite polyester fabric. Time coating 5 minutes thermal Stability of the coating was evaluated at 60C for two months, the insulating properties of the fabric during this period of time was characterized by the magnitude of the resistance and elasticity of the coating method Erickson.

Example

High-quality coating was obtained at a temperature of 100-125C With the following ingredients (in parts) per 100 g of molten bitumen:

bitumen100,0
- fluoroplastic f-32 LF10,0
butyl acetate45,0
- acetone45,0
- mica2,5

The coatings obtained from this composition was kept thermostability at 60C without changes in the next two months; electroid the calculations of properties of tissue during this period of time compared to the original is not changed; elasticity in bending was 5 mm

Comparative performance properties of coatings obtained from the proposed compositions are known and given in the table.

The performance properties of coatings obtained from the proposed and known songs
Operational propertiesKnown compositionThe proposed composition
thermal stability at a temperature of 60CNo change in six monthsWithout changes in the next two to three years
The heat Vika95130
Insulating propertiesThe dielectric constant of 3.0. Breakdown strength 20 kV/mmThe dielectric constant of 3.0. Breakdown strength of 30 kV/mm
The adhesion score21
Impact strength (kgfcm/cm270-160Not broken

Composition for the production of dielectric coatings containing bitumen, characterized in that it further contains polytetrafluoroethylene 32 LN, butyl acetate, acetone and mica in the following ratio of initial components, parts:

Bitumen90,0-100,0
PTFE 32 LF10,0-15,0
Butyl acetate40,0-45,0
Acetone40,0-45,0
Mica2,0-3,0



 

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