CN105985572A - High-electric-stability self-regulation cable material - Google Patents

Abstract

The invention discloses a high-electric-stability self-regulation cable material which comprises a PTC (positive temperature coefficient) core tape, and an insulation layer, a metal shielding layer and a wear-resistant sheath layer which are sequentially coated on the PTC core tape, wherein the PTC core tape is composed of two heating wires arranged in parallel and a PTC material layer respectively coated outside the each heating wire. The preparation method is simple, and is suitable for industrialized mass production. The prepared tracing cable has the advantages of high heat stability and long service life, and is worthy of popularization.

Description

The high self limiting temperature cable material of a kind of electrical stability

Technical field

The present invention relates to cable material technical field, particularly relate to the high self limiting temperature cable material of a kind of electrical stability.

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 slow place of liquid substance solidification/flowing velocity in pipeline to be prevented or tank, 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 10³-10⁹The order of magnitude.Ptc material is broadly divided into pottery Matrix PTC material and high molecular based PTC material two types.Wherein, high molecular based PTC material is easily processed owing to having, is manufactured into The advantages such as this is relatively low, conductive extensions is big, room temperature resistivity is low and demonstrate huge using value.But, in prior art, 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, use electrical conductivity low-melting-point metal high, easily processing 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 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.Significantly reduce metal 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 Dispersiveness be the deciding factor whether affecting ptc material function admirable, affect development and the application of ptc material.PTC material Material stability and whether have NTC effect to be the topmost problem in accompanying-heat cable that applies to.And author is not examined in the whole text Considering and arriving this problem, this is also problem to be solved by this invention.

Content of the invention

The object of the invention is contemplated to make up the defect of prior art, provides the self limiting temperature cable that a kind of electrical stability is high Material.

The present invention is achieved by the following technical solutions:

The high self limiting temperature cable material of a kind of electrical stability, including PTC core ribbon, be coated on successively outside described PTC core ribbon is exhausted Edge 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 layer is constituted；Described ptc material is made up of the raw material of following weight portion: polypropylene 30-35, sn-bi alloy powder 7-9, hard Resin acid 0.2-0.4, sulphur 2-3, conductive zinc oxide 11-13, epoxy natural rubber 9-12, metatitanic acid 5-6, ethanol 12-15, nitre Acid silver 4-6, carbon fiber 15-18, acetylene carbon black 8-9, aluminum-zirconium coupling agent 0.4-0.6, PAMC 0.7-0.8, nothing Water aluminium chloride 3-4, antioxidant 1010 0.3-0.5, cyclic olefine copolymer 22-26, polyethylene 48-55, deionized water are appropriate.

The high self limiting temperature cable material of described a kind of electrical stability, is made up of step in detail below:

(1) take metatitanic acid, ethanol, silver nitrate are added in deionized water, are heated with stirring to 40-50 DEG C of constant temperature and keep 1.5-2h to mix Close solution, then carbon fiber, acetylene carbon black, aluminum-zirconium coupling agent, PAMC are added in mixed liquor stirring, rise high temperature Degree is to holding 1-1.5h when 55-60 DEG C, then adds anhydrous Aluminum chloride under ultrasonic disperse, filters, produce gained after mixing Thing sinters 0.5-1h at 300-400 DEG C, is cooled to after room temperature is pulverized standby；

(2) it by drying 6-8h at polypropylene in an oven 80 DEG C, is cut into particle after cooling, by sn-bi alloy powder, stearic acid, sulphur The polypropylene granules of sulphur, conductive zinc oxide and pretreatment mixes in homogenizer according to proportioning, is then added to double spiral shell Bar extruder extruding pelletization, then particle is dried at 80 DEG C 4-5h, be placed in capillary rheometer, make mixing former Precursor is clamped on fixture by silk, in the environment heating case of 170-180 DEG C, with the speed Uniform Tension fiber of 10mm/min；

(3) product prepared by the product prepared each component of residue formula ratio, step (1) and step (2) is melted by banbury Melting blended, temperature is 160-175 DEG C, and the time is 15-25min, is then granulated by single screw extrusion machine, then by particle at 10- It under the rate of extrusion of 15m/min, is cooled to normal 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 and solid The means stretching 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 nano particle 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, also modified suspension is coated on carbon fiber With acetylene black surface so that it is combine between particle is more tight, and does not affect electric conductivity, and and matrix material between Compatibility is more preferable, does not affect the performance of material itself, and the preparation method of the present invention is simple, is suitable for industrialized production, preparation Accompanying-heat cable heat endurance is high, and service life is long, is worthy to be popularized.

Detailed description of the invention

The high self limiting temperature cable material of a kind of electrical stability, 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 the 30th, sn-bi alloy powder 7th, stearic acid the 0.2nd, sulphur the 2nd, conductive zinc oxide the 11st, epoxy natural rubber the 9th, metatitanic acid the 5th, ethanol the 12nd, silver nitrate the 4th, carbon fiber 15th, acetylene carbon black the 8th, aluminum-zirconium coupling agent the 0.4th, PAMC the 0.7th, anhydrous Aluminum chloride the 3rd, antioxidant 1010 is the 0.3rd, Cyclic olefine copolymer the 22nd, polyethylene the 48th, deionized water is appropriate.

The high self limiting temperature cable material of described a kind of electrical stability, is made up of step in detail below:

(1) take metatitanic acid, ethanol, silver nitrate are added in deionized water, are heated with stirring to 40 DEG C of constant temperature and keep 1.5h must mix molten Liquid, then carbon fiber, acetylene carbon black, aluminum-zirconium coupling agent, PAMC are added in mixed liquor stirring, rise high-temperature extremely Keep 1h when 55 DEG C, then under ultrasonic disperse, add anhydrous Aluminum chloride, filter after mixing, by products therefrom at 300 DEG C Sintering 0.5h, is cooled to after room temperature is pulverized standby；

(2) by polypropylene in an oven 80 DEG C dry 6h, be cut into particle after cooling, by sn-bi alloy powder, stearic acid, sulphur, The polypropylene granules of conductive zinc oxide and pretreatment mixes in homogenizer according to proportioning, is then added to twin-screw and squeezes Go out machine extruding pelletization, then particle dried at 80 DEG C 4h, be placed in capillary rheometer, make mixing precursor, by former Silk is clamped on fixture, in the environment heating case of 170 DEG C, with the speed Uniform Tension fiber of 10mm/min；

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

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

Tensile strength (MPa): 26.2；Elongation at break (%): 381；Oxygen index (OI) (%): 30；Heat endurance: 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): 91；Operating temperature >=160 DEG C.

Claims (2)

1. the high self limiting temperature cable material of an electrical stability, it is characterised in that include PTC core ribbon, is coated on described successively Insulating barrier outside PTC core ribbon, metal screen layer and wear-resistance protective sleeve layer, 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: polypropylene 30-35, tin Bismuth alloy powder 7-9, stearic acid 0.2-0.4, sulphur 2-3, conductive zinc oxide 11-13, epoxy natural rubber 9-12, metatitanic acid 5- 6th, ethanol 12-15, silver nitrate 4-6, carbon fiber 15-18, acetylene carbon black 8-9, aluminum-zirconium coupling agent 0.4-0.6, cation polypropylene Acid amides 0.7-0.8, anhydrous Aluminum chloride 3-4, antioxidant 1010 0.3-0.5, cyclic olefine copolymer 22-26, polyethylene 48-55, Deionized water is appropriate.

2. the high self limiting temperature cable material of a kind of electrical stability according to claim 1, it is characterised in that by detail below Step is made:

(1) take metatitanic acid, ethanol, silver nitrate are added in deionized water, are heated with stirring to 40-50 DEG C of constant temperature and keep 1.5-2h to mix Close solution, then carbon fiber, acetylene carbon black, aluminum-zirconium coupling agent, PAMC are added in mixed liquor stirring, rise high temperature Degree is to holding 1-1.5h when 55-60 DEG C, then adds anhydrous Aluminum chloride under ultrasonic disperse, filters, produce gained after mixing Thing sinters 0.5-1h at 300-400 DEG C, is cooled to after room temperature is pulverized standby；

(2) it by drying 6-8h at polypropylene in an oven 80 DEG C, is cut into particle after cooling, by sn-bi alloy powder, stearic acid, sulphur The polypropylene granules of sulphur, conductive zinc oxide and pretreatment mixes in homogenizer according to proportioning, is then added to double spiral shell Bar extruder extruding pelletization, then particle is dried at 80 DEG C 4-5h, be placed in capillary rheometer, make mixing former Precursor is clamped on fixture by silk, in the environment heating case of 170-180 DEG C, with the speed Uniform Tension fiber of 10mm/min；

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