CN106028485A - Super chemical resistant self-temperature-limiting heat tracing cable - Google Patents

Abstract

The invention discloses a super chemical resistant self-temperature-limiting heat tracing cable. The super chemical resistant self-temperature-limiting heat tracing cable comprises a PTC core belt, as well as an insulating layer, a metal shielding layer and a wear-resistant sheath layer which are wrapped outside the PTC core belt in sequence, wherein the PTC core belt is composed of two heating wires arranged in parallel and a PTC material layer wrapped outside the heating wires. The heat tracing cable prepared by the invention has higher insulating property, corrosion resistance, flame retardant property and mechanical property, is simple in preparation technology, and is applicable for large-scale industrial production.

Description

A kind of super chemical-resistant self limiting temperature accompanying-heat cable

Technical field

The present invention relates to cable material technical field, particularly relate to a kind of super chemical-resistant self limiting temperature accompanying-heat 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 super chemical-resistant self limiting temperature heat tracing electricity Cable.

The present invention is achieved by the following technical solutions:

A kind of super chemical-resistant self limiting temperature accompanying-heat cable, including PTC core ribbon, is coated on the insulation outside described PTC core ribbon successively Layer, 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 its outer PTC material The bed of material is constituted；Described ptc material is made up of the raw material of following weight portion: polypropylene 30-35, pb-ag alloy powder 4-6, silane Coupling agent kh5700.3-0.4, zinc stearate 0.2-0.4, carbon fiber 13-16, carboxyl butyronitrile powdered rubber 9-12, polypyrrole are micro- Ball 9-12, silicon dioxide microsphere 6-8, Polyurethane Thermoplastic Elastomer 22-28, high density polyethylene (HDPE) 50-60, antioxidant 10100.5-0.7, deionized water appropriate.

Described one surpasses chemical-resistant self limiting temperature accompanying-heat cable, is made up of step in detail below:

(1) will be added in dehydrated alcohol be prepared as the dispersion liquid of 3-5mg/ml after carbon fiber chopped, ultrasonic disperse uniformly after with The speed centrifugation of 800-1000 rev/min, takes its supernatant standby；By polypyrrole microsphere and silicon dioxide microsphere, (particle diameter is 10-20 μm) it is added in above-mentioned supernatant, ultrasonic disperse processes, and power is 50Kw, carries out centrifugation after ultrasonic end, filters, Product is added in baking oven in 105 DEG C of dried；

(2) by drying 6-8h at polypropylene in an oven 80 DEG C, after cooling, it is cut into granule, silane coupler kh570, lead silver are closed The polypropylene granules of bronze 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 4-5h, be placed in capillary rheometer, make mixing precursor, by precursor press from both sides Hold on fixture, add 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 the present invention also utilizes polymer microballoon and poly-pyrrole Carbon fiber is coated with by stability and the electric conductivity of coughing up microsphere, obtains electric conductivity height, good stability, phase in matrix material The filler that capacitive is good, improves electric conductivity and the heat stability of composite conducting material, and accompanying-heat cable prepared by the present invention possesses Preferably insulating properties, decay resistance, fire resistance and mechanical performance, its preparation technology is simple, is suitable for large-scale industry Metaplasia is produced.

Detailed description of the invention

A kind of super chemical-resistant self limiting temperature 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 (kilogram): polypropylene 30, pb-ag alloy powder 4, silane coupler kh5700.3, zinc stearate 0.2, carbon fiber 13, carboxyl butyronitrile powdered rubber 9, polypyrrole microsphere 9, dioxy SiClx microsphere 6, Polyurethane Thermoplastic Elastomer 22, high density polyethylene (HDPE) 50, antioxidant 1010 0.5, deionized water are appropriate.

Described one surpasses chemical-resistant self limiting temperature accompanying-heat cable, is made up of step in detail below:

(1) will be added in dehydrated alcohol be prepared as the dispersion liquid of 3mg/ml after carbon fiber chopped, with 800 after ultrasonic disperse is uniform Rev/min speed centrifugation, take its supernatant standby；Polypyrrole microsphere and silicon dioxide microsphere (particle diameter is 10 μm) are added to In above-mentioned supernatant, ultrasonic disperse processes, and power is 50Kw, carries out centrifugation after ultrasonic end, filters, and product is added to baking oven In in 105 DEG C of dried；

(2) by drying 6h at polypropylene in an oven 80 DEG C, granule it is cut into after cooling, by silane coupler kh570, pb-ag alloy The polypropylene granules of powder and pretreatment, according to proportioning mix homogeneously in homogenizer, is then added to double screw extruder extrusion Pelletize, then granule is dried at 80 DEG C 4h, be placed in capillary rheometer, make mixing precursor, precursor be clamped in 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): 24.7；Elongation at break (%): 382；Oxygen index (OI) (%): 31；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): 92；Operating temperature >=160 DEG C.

Claims (2)

1. a super chemical-resistant self limiting temperature accompanying-heat cable, it is characterised in that include PTC core ribbon, be coated on described PTC successively Insulating barrier, metal screen layer and wear-resistance protective sleeve layer outside core ribbon, PTC core ribbon is by two heating-wires being arranged in parallel and is coated on Its outer ptc layer is constituted；Described ptc material is made up of the raw material of following weight portion: polypropylene 30-35, lead silver close Bronze 4-6, silane coupler kh5700.3-0.4, zinc stearate 0.2-0.4, carbon fiber 13-16, carboxyl butyronitrile powdered rubber 9- 12, polypyrrole microsphere 9-12, silicon dioxide microsphere 6-8, Polyurethane Thermoplastic Elastomer 22-28, high density polyethylene (HDPE) 50-60, Antioxidant 1010 0.5-0.7, deionized water are appropriate.

A kind of super chemical-resistant self limiting temperature accompanying-heat cable, it is characterised in that by walking in detail below Suddenly make:

(1) will be added in dehydrated alcohol be prepared as the dispersion liquid of 3-5mg/ml after carbon fiber chopped, ultrasonic disperse uniformly after with The speed centrifugation of 800-1000 rev/min, takes its supernatant standby；By polypyrrole microsphere and silicon dioxide microsphere, (particle diameter is 10-20 μm) it is added in above-mentioned supernatant, ultrasonic disperse processes, and power is 50Kw, carries out centrifugation after ultrasonic end, filters, Product is added in baking oven in 105 DEG C of dried；

(2) by drying 6-8h at polypropylene in an oven 80 DEG C, after cooling, it is cut into granule, silane coupler kh570, lead silver are closed The polypropylene granules of bronze 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 4-5h, be placed in capillary rheometer, make mixing precursor, by precursor press from both sides Hold on fixture, add 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.