CN105968498A - Polymer-based conductive heat tracing cable with high heat stability - Google Patents

Abstract

The invention discloses a polymer-based conductive heat tracing cable with high heat stability. The polymer-based conductive heat tracing cable comprises a PTC core belt, an insulating layer, a metal shielding layer and an anti-abrasion jacket layer. The PTC core belt is sequentially covered with the insulating layer, the metal shielding layer and the anti-abrasion jacket layer. The PTC core belt is composed of two parallel heating wires and a PTC material layer covering the heating wires. The prepared heat tracing cable material is good in flame retardance and antioxidation effect, high in heat stability, resistant to scratches and folding, good in flexibility and machinability and worthy of popularization.

Description

A kind of high thermal stability polymer-based conduction accompanying-heat cable

Technical field

The present invention relates to cable material technical field, particularly relate to a kind of high thermal stability polymer-based conduction heat tracing electricity 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 a kind of high thermal stability polymer-based conduction companion Electric heating cable.

The present invention is achieved by the following technical solutions:

A kind of high thermal stability polymer-based conduction accompanying-heat cable, including PTC core ribbon, is coated on outside described PTC core ribbon successively Insulating barrier, metal screen layer and wear-resistance protective sleeve layer, PTC core ribbon is by two heating-wires being arranged in parallel and to be coated on it outer Ptc layer is constituted；Described ptc material is made up of the raw material of following weight portion: polypropylene 30-35, sn-bi alloy powder 4- 6, sodium tripolyphosphate 0.3-0.4, titanium carbide 13-16, carboxyl butyronitrile powdered rubber 9-12, potato starch 4-5, linoleic acid sodium 2- 2.5, aluminium stearate 0.5-0.8, graphite oxide 8-12, Kaolin 6-8, sodium trimetaphosphate 1.3-2, cross-linking agent TAC0.1-0.2, Nylon 25-30, polyphenylene sulfide 12-15, high density polyethylene (HDPE) 44-50, deionized water are appropriate.

Described a kind of high thermal stability polymer-based conduction accompanying-heat cable, is made up of step in detail below:

(1) potato starch is added in cold deionized water stir 4-6min, rise high-temperature to when 70-85 DEG C stir gelatinizing, Mixing speed controls at 500-700rpm, adds linoleic acid sodium, aluminium stearate continuation stirring reaction 30-40min, and stirring terminates Rear addition graphite oxide and Kaolin, naturally cool to 45-55 DEG C after stirring, stir speed (S.S.) is 200-400rpm, now It is standby that addition sodium trimetaphosphate and cross-linking agent TAC are cooled to room temperature after stirring；

(2) by polypropylene in an oven 80 DEG C dry 6-8h, be cut into granule after cooling, by sn-bi alloy powder, sodium tripolyphosphate, The polypropylene granules of titanium carbide and pretreatment, according to proportioning mix homogeneously in homogenizer, is 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 (2) prepared and step (3) 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 the present invention also uses the horse of water-repelling agent and pasty state Bell sweet potato starch generation compound reaction so that starch obtains hydrophobicity, reduces its dissolution rate in water, finally hands over filler Connection modification so that it is there is good hydrophobicity, mechanical property, improve the anti-shear ability of filling surface so that it is at matrix material Having the good compatibility and electric conductivity in material, accompanying-heat cable material prepared by the present invention is fire-retardant, antioxidant effect good, heat stability Can be high, damage resistant, fold resistant have good pliability and machinability, are worthy to be popularized.

Detailed description of the invention

A kind of high thermal stability polymer-based conduction accompanying-heat cable, including PTC core ribbon, is coated on described PTC core ribbon successively Outer insulating barrier, metal screen layer and wear-resistance protective sleeve layer, PTC core ribbon is by two heating-wires being arranged in parallel and is coated on outside it Ptc layer constitute；Described ptc material is made up of the raw material of following weight portion (kilogram): polypropylene 30, sn-bi alloy Powder 4, sodium tripolyphosphate 0.3, titanium carbide 13, carboxyl butyronitrile powdered rubber 9, potato starch 4, linoleic acid sodium 2, aluminium stearate 0.5, graphite oxide 8, Kaolin 6, sodium trimetaphosphate 1.3, cross-linking agent TAC0.1, nylon 25, polyphenylene sulfide 12, high-density polyethylene Alkene 44, deionized water are appropriate.

Described a kind of high thermal stability polymer-based conduction accompanying-heat cable, is made up of step in detail below:

(1) it is added to potato starch in cold deionized water stir 4min, rises high-temperature to stirring gelatinizing when 70 DEG C, stirring speed Spending controls at 500rpm, adds linoleic acid sodium, aluminium stearate continuation stirring reaction 30min, and after stirring terminates, addition aoxidizes stone Ink and Kaolin, naturally cool to 45 DEG C after stirring, stir speed (S.S.) is 200rpm, now adds sodium trimetaphosphate and crosslinking It is standby that agent TAC is cooled to room temperature after stirring；

(2) by drying 6h at polypropylene in an oven 80 DEG C, granule it is cut into after cooling, by sn-bi alloy powder, sodium tripolyphosphate, carbon The polypropylene granules of change titanium 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 (2) prepared and step (3) 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 material is as follows:

Hot strength (MPa): 26.5；Elongation at break (%): 379；Oxygen index (OI) (%): 32；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): 97；Operating temperature >=160 DEG C.

Claims (2)

1. a high thermal stability polymer-based conduction accompanying-heat cable, it is characterised in that include PTC core ribbon, be coated on institute successively State the insulating barrier outside PTC core ribbon, metal screen layer and wear-resistance protective sleeve layer, PTC core ribbon by two heating-wires being arranged in parallel and It is coated on its outer ptc layer to constitute；Described ptc material is made up of the raw material of following weight portion: polypropylene 30-35, Sn-bi alloy powder 4-6, sodium tripolyphosphate 0.3-0.4, titanium carbide 13-16, carboxyl butyronitrile powdered rubber 9-12, potato starch 4- 5, linoleic acid sodium 2-2.5, aluminium stearate 0.5-0.8, graphite oxide 8-12, Kaolin 6-8, sodium trimetaphosphate 1.3-2, cross-linking agent TAC0.1-0.2, nylon 25-30, polyphenylene sulfide 12-15, high density polyethylene (HDPE) 44-50, deionized water are appropriate.

A kind of high thermal stability polymer-based conduction accompanying-heat cable, it is characterised in that by following tool Body step is made:

(1) potato starch is added in cold deionized water stir 4-6min, rise high-temperature to when 70-85 DEG C stir gelatinizing, Mixing speed controls at 500-700rpm, adds linoleic acid sodium, aluminium stearate continuation stirring reaction 30-40min, and stirring terminates Rear addition graphite oxide and Kaolin, naturally cool to 45-55 DEG C after stirring, stir speed (S.S.) is 200-400rpm, now It is standby that addition sodium trimetaphosphate and cross-linking agent TAC are cooled to room temperature after stirring；

(2) by polypropylene in an oven 80 DEG C dry 6-8h, be cut into granule after cooling, by sn-bi alloy powder, sodium tripolyphosphate, The polypropylene granules of titanium carbide and pretreatment, according to proportioning mix homogeneously in homogenizer, is 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 (2) prepared and step (3) 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.