CN106060987A - High molecular self-temperature-limiting heat-tracing cable applicable to safety voltage - Google Patents

Abstract

The invention discloses a high molecular self-temperature-limiting heat-tracing cable applicable to safety voltage. The high molecular self-temperature-limiting heat-tracing cable comprises a PTC core belt, an insulating layer, a metal shielding layer and a wearable sheath layer, wherein the insulating layer, the metal shielding layer and the wearable sheath layer are sequentially wrapped outside the PTC core belt; and the PTC core belt is composed of two parallel heating conductor wires and a PTC material layer wrapped outside. The cable prepared by the invention is high-temperature resistant, good in ageing resistance and high in flexibility; the stability and the service life of the cable material in a severe environment are improved; the cost is low; temperature rising can be rapidly completed at low voltage; and the high molecular self-temperature-limiting heat-tracing cable is high in safety and worthy of being popularized.

Description

One can be applicable to safe voltage high polymer self-limiting temperature accompanying-heat cable

Technical field

The present invention relates to cable material technical field, particularly relate to one and can be applicable to safe voltage high polymer self-limiting temperature companion Electric heating cable.

Background technology

Accompanying-heat cable is widely used in many fields, needs in oil, chemical industry, steam power plant etc. as mainly utilized in industrial aspect The place that liquid substance solidification/flowing velocity in pipeline to be prevented or tank is slow, is mainly used in extinguishing pipe in terms of communal facility The heat tracing in road, can be used for heating of house and the antifreeze aspect of yard piping in winter at civilian aspect.The core of accompanying-heat cable is Its structure and its electrothermal part ptc material of making.Ptc material refers to the one that the resistance value of material rises with the rising of temperature It is held essentially constant when the resistance of thermo-sensitive material, i.e. material or resistivity are within the scope of a certain specific temperature or only small quantity Change, and when temperature reaches near certain specific knee pointy temperature of material, the resistivity of material can be in the several years or ten Undergoing mutation within the scope of the narrow temperature in several years, resistivity increases rapidly the 103-109 order of magnitude.Ptc material is broadly divided into pottery Porcelain matrix PTC material and high molecular based PTC material two types.Wherein, high molecular based PTC material is owing to having easily processing, manufacturing The advantages such as cost is relatively low, conductive extensions is big, room temperature resistivity is low and demonstrate huge using value.But, prior art In, high molecular based PTC material and macromolecule accompanying-heat cable there is also the defects such as stability is poor, PTC intensity is relatively low.

In " preparation of conduction _ anti-electrostatic polymer nano composite material and performance study thereof " literary composition, author utilizes low melting point The conductive filler such as metal, CNT prepares conductive anti-static polymer composites and fiber, it is proposed that new preparation Method and new principle, the low-melting-point metal use electrical conductivity height, easily processing is as conductive filler, by melt blending and solid phase The methods such as stretching, prepare composite fibre, show that polymer/low melting point conducting metal composite fibre has resistivity along with stretching The raising of multiplying power and the character that reduces, compare with the composite fibre not containing low conduction melting-point fibers, the intensity of its composite fibre All increase with elongation at break.Metal is significantly reduced by interpolation CNT and nano imvite in composite fibre Grain diameter so that composite fibre obtains more excellent electrical property and mechanical property.Conductive filler is in polymeric matrix Dispersibility be the deciding factor whether affecting ptc material function admirable, affect development and the application of ptc material.PTC material The stability of material and whether to have NTC effect be to apply to topmost problem in accompanying-heat cable.And author is not examined in the whole text Considering to this problem, this is also problem to be solved by this invention.

Summary of the invention

The object of the invention is contemplated to make up the defect of prior art, it is provided that one can be applicable to safe voltage macromolecule certainly Limit temperature accompanying-heat cable.

The present invention is achieved by the following technical solutions:

One can be applicable to safe voltage high polymer self-limiting temperature accompanying-heat cable, including PTC core ribbon, is coated on described PTC core successively Insulating barrier, metal screen layer and wear-resistance protective sleeve layer outside band, PTC core ribbon is by two heating-wires being arranged in parallel and is coated on it Outer ptc layer is constituted；Described ptc material is made up of the raw material of following weight portion: maleic anhydride inoculated polypropylene 30- 35, metallic tin powder 6-7, antioxidant BD0.2-0.4, carbon fiber 13-16, white carbon black 6-8, carboxyl butyronitrile powdered rubber 9-12, poly-second Enol, binary isocyanates, graphene oxide 7-9, antimony oxide 7-8, maleic anhydride grafted polyethylene 44-49, polyester tree Fat 14-18, antioxidant 1010 0.4-0.6, vaseline 3-4, anti-aging agent RD 0.7-1, DMF 7-9, go from Sub-water is appropriate.

Described one can be applicable to safe voltage high polymer self-limiting temperature accompanying-heat cable, is made up of step in detail below:

(1) by carbon fiber and white carbon black acetone soak, it is placed on magnetic stirring apparatus stirring 24h, is then washed with deionized number It is dried at 80 DEG C in vacuum drying oven to constant weight after secondary, graphene oxide is added to after vacuum drying DMF Uniform with ultrasonic disperse in the mixed solvent of water 1:9, add above-mentioned carbon fiber and the ultrasonic 30-40min of white carbon black, after ultrasonic end It is transferred in sintering furnace at 200-250 DEG C sinter 2-3h；

(2) by drying 6-8h at polypropylene in an oven 80 DEG C, granule it is cut into after cooling, by metallic tin powder, antioxidant BD, three oxygen Change the polypropylene granules of two antimony and pretreatment according to proportioning mix homogeneously in homogenizer, be then added to double screw extruder Extruding pelletization, then granule is dried at 80 DEG C 4-5h, be placed in capillary rheometer, make mixing precursor, by precursor It is clamped on fixture, adds in hot tank at the environment of 170-180 DEG C, with the speed Uniform Tension fiber of 10mm/min；

(3) product prepared by product residue each component of formula ratio, step (1) prepared and step (2) is melted by banbury Melting blended, temperature is 160-175 DEG C, and the time is 15-25min, then by single screw extrusion machine pelletize, then by particle at 10- Under the rate of extrusion of 15m/min, it is cooled to room temperature by extrusion die extrusion stranding material.

The invention have the advantage that and by the present invention in that with low-melting-point metal as conductive filler, in conjunction with melting mixing with solid The means stretched mutually, are prepared for conduction, antistatic composite fiber so that it is have good intensity and elongation at break, and have Excellent electric conductivity and mechanical property, solve metal and cause electrical conductivity to decline with matrix material poor compatibility, easily oxidation Problem, and by introduce ultra fine powder rubber and modified graphene, it is achieved high volume fill, significantly improve volume get rid of The efficiency of effect, and help difficult scattered nanoparticle in polymerization species dispersion, the perfect conductive mesh of metal/conductive material Network, considerably reduces conduction excess effusion value, improves the electrical stability of material, and conductive material is changed by the present invention by solvent Property so that it is at matrix material, there is the good compatibility, it is possible to form preferable conductive network, rise high-temperature fast, energy-conserving and environment-protective, Cable prepared by the present invention is high temperature resistant, ageing resistance good, pliability is high, improves cable material stablizing in the presence of a harsh environment Property and life-span, low cost, and it is high to be rapidly completed intensification, safety under low voltage, is worthy to be popularized.

Detailed description of the invention

One can be applicable to safe voltage high polymer self-limiting temperature accompanying-heat cable, including PTC core ribbon, is coated on described successively Insulating barrier, metal screen layer and wear-resistance protective sleeve layer outside PTC core ribbon, PTC core ribbon is by two heating-wires being arranged in parallel and bag Overlay on its outer ptc layer to constitute；Described ptc material is made up of the raw material of following weight portion (kilogram): maleic anhydride Graft polypropylene 30, metallic tin powder 6, antioxidant BD0.2, carbon fiber 13, white carbon black 6, carboxyl butyronitrile powdered rubber 9, polyvinyl alcohol, Binary isocyanates, graphene oxide 7, antimony oxide 7, maleic anhydride grafted polyethylene 44, polyester resin 14, antioxidant 10100.4, vaseline 3, anti-aging agent RD 0.7, DMF 7, deionized water are appropriate.

Described one can be applicable to safe voltage high polymer self-limiting temperature accompanying-heat cable, is made up of step in detail below:

(1) by carbon fiber and white carbon black acetone soak, it is placed on magnetic stirring apparatus stirring 24h, is then washed with deionized number It is dried at 80 DEG C in vacuum drying oven to constant weight after secondary, graphene oxide is added to after vacuum drying DMF Uniform with ultrasonic disperse in the mixed solvent of water 1:9, add above-mentioned carbon fiber and the ultrasonic 30min of white carbon black, turn after ultrasonic end Move to sintering furnace sinters at 200 DEG C 2h；

(2) by drying 6h at polypropylene in an oven 80 DEG C, granule after cooling, it is cut into, by metallic tin powder, antioxidant BD, three oxidations The polypropylene granules of two antimony and pretreatment, according to proportioning mix homogeneously in homogenizer, is then added to double screw extruder and squeezes Go out pelletize, then granule dried at 80 DEG C 4h, be placed in capillary rheometer, make mixing precursor, by precursor clamp On fixture, add in hot tank at the environment of 170 DEG C, with the speed Uniform Tension fiber of 10mm/min；

(3) product prepared by product residue each component of formula ratio, step (1) prepared and step (2) is melted by banbury Melting blended, temperature is 160 DEG C, and the time is 15min, then by single screw extrusion machine pelletize, then by particle squeezing at 10m/min Go out under speed, be cooled to room temperature by extrusion die extrusion stranding material.

The performance test of this accompanying-heat cable is as follows:

Hot strength (MPa): 25.2；Elongation at break (%): 387；Oxygen index (OI) (%): 35；Heat stability: by 10 DEG C to 99 DEG C After circulating 300 times back and forth, electric cable heating amount maintains 95%；Specific insulation (Ω .cm): 88；Operating temperature >=160 DEG C.

Claims (2)

1. one kind can be applicable to safe voltage high polymer self-limiting temperature accompanying-heat cable, it is characterised in that includes PTC core ribbon, wraps successively Overlaying on the insulating barrier outside described PTC core ribbon, metal screen layer and wear-resistance protective sleeve layer, PTC core ribbon is by two heatings being arranged in parallel Wire is constituted with the ptc layer being coated on outside it；Described ptc material is made up of the raw material of following weight portion: maleic acid Acid anhydride graft polypropylene 30-35, metallic tin powder 6-7, antioxidant BD0.2-0.4, carbon fiber 13-16, white carbon black 6-8, carboxyl butyronitrile powder End rubber 9-12, polyvinyl alcohol, binary isocyanates, graphene oxide 7-9, antimony oxide 7-8, maleic anhydride are grafted poly-second Alkene 44-49, polyester resin 14-18, antioxidant 1010 0.4-0.6, vaseline 3-4, anti-aging agent RD 0.7-1, N, N-dimethyl Methanamide 7-9, deionized water are appropriate.

The most according to claim 1, one can be applicable to safe voltage high polymer self-limiting temperature accompanying-heat cable, it is characterised in that by Step is made in detail below:

(1) by carbon fiber and white carbon black acetone soak, it is placed on magnetic stirring apparatus stirring 24h, is then washed with deionized number It is dried at 80 DEG C in vacuum drying oven to constant weight after secondary, graphene oxide is added to after vacuum drying DMF Uniform with ultrasonic disperse in the mixed solvent of water 1:9, add above-mentioned carbon fiber and the ultrasonic 30-40min of white carbon black, after ultrasonic end It is transferred in sintering furnace at 200-250 DEG C sinter 2-3h；

(2) by drying 6-8h at polypropylene in an oven 80 DEG C, granule it is cut into after cooling, by metallic tin powder, antioxidant BD, three oxygen Change the polypropylene granules of two antimony and pretreatment according to proportioning mix homogeneously in homogenizer, be then added to double screw extruder Extruding pelletization, then granule is dried at 80 DEG C 4-5h, be placed in capillary rheometer, make mixing precursor, by precursor It is clamped on fixture, adds in hot tank at the environment of 170-180 DEG C, with the speed Uniform Tension fiber of 10mm/min；

(3) product prepared by product residue each component of formula ratio, step (1) prepared and step (2) is melted by banbury Melting blended, temperature is 160-175 DEG C, and the time is 15-25min, then by single screw extrusion machine pelletize, then by particle at 10- Under the rate of extrusion of 15m/min, it is cooled to room temperature by extrusion die extrusion stranding material.