CN104961966B - Heat the preparation method of cable, semi-conductive high polymer material and semi-conductive high polymer material - Google Patents

Heat the preparation method of cable, semi-conductive high polymer material and semi-conductive high polymer material Download PDF

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CN104961966B
CN104961966B CN201510423378.7A CN201510423378A CN104961966B CN 104961966 B CN104961966 B CN 104961966B CN 201510423378 A CN201510423378 A CN 201510423378A CN 104961966 B CN104961966 B CN 104961966B
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CN104961966A (en
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林群彬
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Guangdong Huan Wei Electric Wire Ltd Co
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/02—Organic and inorganic ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/346—Clay
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/13—Phenols; Phenolates
    • C08K5/134—Phenols containing ester groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C08L23/0853—Vinylacetate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C08L91/06—Waxes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

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Abstract

The present invention relates to a kind of semi-conductive high polymer material, and the semi-conductive high polymer material includes component A, B component and crosslinking agent；In terms of parts by weight, the component A includes：LLDPE is 100 parts；Carbon black CB is 20 parts；10.0~11.0 parts of clay；Paraffin：8.0~8.5 parts；BaTiO3：4.5~5.0 parts；The B component includes：EVA is 100 parts；Carbon black CB is 20 parts；Antioxidant 1010 is 6.0~6.5 parts；Paraffin is 7.5~8.0 parts；Crosslinking agent is 2~3 parts.Semi-conductive high polymer material provided in an embodiment of the present invention is used to manufacture the heater element of self controlled heating cable, reach it is conductive can be good, there are the advantageous effects of good electric heating circulating performance and mechanical performance.

Description

Heat the preparation of cable, semi-conductive high polymer material and semi-conductive high polymer material Method
Technical field
The present invention relates to industrial polymeric material field more particularly to a kind of self controlled heating cable semiconductive high scores Sub- material and preparation method thereof.
Background technology
It is colder in northern China winter, bring inconvenience, such as oil pipeline to industrial and agricultural production, people's lives Road, the pertroleum wax in winter crude oil are easily set on the inner tubal wall of oil pipe, and cumulative, cause oil transportation blockage, Difficulty is brought to Crude Oil Transportation.Traditional solution is to add oil pipeline with boiler hot-water, allows and is set in inner wall of the pipe Pertroleum wax melts, and is carried out dehydrating before being sent to oil plant, the water detached is sent boiler back to and recycled again, is done using this Method needs a large amount of material resources and financial resources, can also waste mass energy.Therefore, occur some new solutions at present, it will Self controlled heating cable is wrapped on the outside of oil pipeline, and this scheme can effectively solve this technical barrier.
The manufacture key of self controlled heating cable is to form a kind of semiconductive material for playing heating functioin of the construction of cable, Therefore this semi-conductive high polymer mixture is developed with very big economic value and realistic function.
Invention content
In view of this, it is really necessary to provide a kind of semi-conductive high polymer material for heating cable.
The present invention provides a kind of semi-conductive high polymer material, which includes component A, component B and crosslinking agent, and component A It is base material (English by LLDPE：Linear Low-Density Polyethy-lene, english abbreviation LLDPE, Chinese：Line style Low density polyethylene (LDPE)), component B is by EVA (English names：Ethylene-vinyl acetate copolymer, English abbreviation： EVA, Chinese：Plastic material is ethylene-vinyl acetate copolymer) it is base material, first by component A and component B respectively at a high speed Mixing granulation in mixing machine, then component A particles and component B particles are put into high-speed mixer be mixed and added by a certain percentage Crosslink agent DCP (English name：Dicumylperoxide, english abbreviation：DCP, Chinese：Cumyl peroxide), mixing It is granulated again through comminutor after uniformly, a kind of self controlled heating cable semi-conductive high polymer material is made.The specific skill of the present invention Art scheme is as follows：
A kind of semi-conductive high polymer material, the semi-conductive high polymer material include component A, B component and crosslinking agent；With weight Number meter is measured, the component A includes：
LLDPE：100 parts；Carbon black CB：20 parts；Clay：10.0~11.0 parts；Paraffin：8.0~8.5 parts；BaTiO3：4.5 ~5.0 parts；
The B component includes：
EVA：100 parts；Carbon black CB：20 parts；Antioxidant 1010：6.0~6.5 parts；Paraffin：7.5~8.0 parts；
Crosslinking agent：2~3 parts.
Further, the crosslinking agent is DCP.
Further, described method includes following steps：
Step a:The component A is added in and is stirred into high-speed mixer, the component A after stirring evenly is added to granulation In machine, extruding pelletization obtains component A particle；
Step b:The component B is added in high-speed mixer and is stirred, the component B after stirring evenly is added to granulation In machine, extruding pelletization obtains component B particle；
Step c:The component A particle and the component B particle are put into high-speed mixer, at the same add in crosslinking agent into Row mixing, the mixture after stirring evenly are sent into comminutor, and granulation obtains the heating cable semi-conductive high polymer material Material.
Further, the specific method of the step a includes：
The component A is added in high-speed mixer and is stirred, and when reaching 87~93 DEG C, the component A after stirring evenly is added in Into the comminutor of pre-heating to 112~118 DEG C, extruding pelletization obtains component A particle.
Further, the specific method of the step b includes：
The component B, which is added in high-speed mixer, to be stirred, and when reaching 52~58 DEG C, the component B after stirring evenly adds Enter to being preheated in 77~83 DEG C of comminutor, extruding pelletization obtains component B particle.
Further, the specific method of the step c includes：
The component A particle and the component B particle are put in proportion into high-speed mixer, at the same add in crosslinking agent into Row mixing, when temperature reaches 92~98 DEG C, the mixture after stirring evenly is sent into the granulation of pre-heating to 107~113 DEG C In machine, granulation obtains the heating cable semi-conductive high polymer material.
A kind of heating cable, including being protected outside tin plating soft copper stranded conductor, heater element, tincopper fuse wire braided armor and PVC Set；Semiconductor high polymer material described in the heater element is made；Two tin plating soft copper stranded conductors are set up in parallel, institute State the outside that heater element integral type is coated on described two tin plating soft copper stranded conductors；The tin copper-wire braided layer of crossing is coated on Outside the heater element, the PVC oversheaths are coated on outside the tincopper fuse wire braided armor.
Compared to the prior art, the present invention provides a kind of main advantageous effect of semi-conductive high polymer material and is：Using The grouping blending technology of component A and component B makes carbon black CB be uniformly distributed in the semi-conductive high polymer material, so that material Electric conductivity is uniform；Because clay and BaTiO3 electropositivies have the ability of absorption electronics, the electric stability of material is greatly improved；Stone Wax can be obviously improved the positive temperature coefficient characteristic of material, and material has good temperature control sensitivity；Antioxidant 1010 makes Material has good heat-resisting, anti-aging characteristic.It is to have positive temperature that the present invention, which provides heating cable semi-conductive with high molecular material, Spend the semi-conductive high polymer material of coefficient, reached with good electric conductivity and simultaneously with good electric heating circulating performance and The advantageous effects of good mechanical performance.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is below specific embodiment, to this hair It is bright to be further elaborated.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention Limit the present invention.
Embodiment 1
The embodiment of the present invention provides a kind of semi-conductive high polymer material, and the semi-conductive high polymer material includes component A, B Component and crosslinking agent；In terms of parts by weight, the component A includes：
LLDPE：100 parts；Carbon black CB：20 parts；Clay：10.0 parts；Paraffin：8.0；BaTiO3：4.5 part；
The B component includes：
EVA：100 parts；Carbon black CB：20 parts；Antioxidant 1010：6.0 part；Paraffin：7.5 part；Crosslinking agent：2 parts.
It should be noted that in component A, using LLDPE as base material, add in clay and BaTiO3 greatly improves the electricity of mixture Thermal stability, because its electropositive has the ability of absorption electronics.
Carbon black CB is highly conductive carbon black, and conductive black CB difficulties in dispersion, leads to semi-conductive high polymer material in the prior art Electric conductivity is uneven, and the carbon black equivalent is distributed into two components, made in material using grouping hybrid technique by the present invention Conductive black CB is uniformly dispersed, and while electric action is played, makes electric conductivity uniform.
Paraffin can be obviously improved the positive temperature coefficient characteristic of material, and material has good temperature control sensitivity.
Conductive CB particles " confinement " in cross-meshed, are effectively limited CB particles in crystallization/melting process by crosslinking agent The degree of freedom of middle movement, while improve the Curie-point temperature of material.
Antioxidant 1010 is added in, makes material that there is good heat-resisting, anti-aging characteristic.
The preparation method of the heating cable semiconductor high polymer material includes the following steps：
It is prepared by component A particle：The component A is added in high-speed mixer and is stirred, when reaching 87 DEG C, after stirring evenly Component A is added in the comminutor of pre-heating to 112 DEG C, and extruding pelletization obtains component A particle.
It is prepared by component B particle：The component B, which is added in high-speed mixer, to be stirred, when reaching 52 DEG C, after stirring evenly Component B be added to and be preheated in 77 DEG C of comminutor, extruding pelletization obtains component B particle.
Component A particle is blended with component B particle：The component A particle and the component B particle are put into mixed at high speed Machine, while add in crosslinking agent and mixed, when temperature reaches 92 DEG C, the mixture after stirring evenly be sent into pre-heating to 97 DEG C comminutor in, be granulated obtain heating cable semi-conductive high polymer material.
Performance detection：
1st, electrical property detects, at different temperature the resistivity of detection material, and the relationship of resistivity log and temperature is such as Under：
Table 1
lgρ 4.09 4.15 4.21 5.1 7.21 8.1 7.32
Temperature 30 50 70 90 110 130 150
Under normal circumstances, the control temperature range of self controlled heating cable is at 30~50 DEG C, in the automatic control of heating cable In warm range, resistivity log is more than or equal to 4, and the material has positive temperature coefficient, and electrical property is good.
2nd, physical mechanical property detects
The tensile strength and elongation at break before the material aging and after aging are detected, it is as shown in the table：
Table 2
Tensile strength Elongation at break
Before aging ≥12.5N/mm2 >=150%
After aging ≥12.5N/mm2 >=150%
By the test result of above example it is found that heating cable semi-conductive macromolecule mixture disclosed by the embodiments of the present invention It with excellent positive temperature-coefficient of electrical resistance, is recycled through multiple cold heat, temperature-coefficient of electrical resistance is stablized, and there is good electric heating to follow Ring performance, physical mechanical property meets manufacture self controlled heating cable requirement, so that cable may be reused, and preparation method It is simple and convenient to operate, is at low cost.
Embodiment 2
The embodiment of the present invention provides a kind of semi-conductive high polymer material, and the semi-conductive high polymer material includes component A, B Component and crosslinking agent；In terms of parts by weight, the component A includes：
LLDPE：100 parts；Carbon black CB：20 parts；10.5 parts of clay；Paraffin：8.2 part；BaTiO3：4.7 part；
The B component includes：
EVA is 100 parts；Carbon black CB is 20 parts；Antioxidant 1010 is 6.3 parts；Paraffin is 7.7 parts；
The crosslinking agent is DCP, and parts by weight are 2.5 parts.
The preparation method of the heating cable semiconductor high polymer material：
It is prepared by component A particle：The component A is added in high-speed mixer and is stirred, when reaching 90 DEG C, after stirring evenly Component A is added in the comminutor of pre-heating to 115 DEG C, and extruding pelletization obtains component A particle.
It is prepared by component B particle：The component B, which is added in high-speed mixer, to be stirred, when reaching 55 DEG C, after stirring evenly Component B be added to and be preheated in 80 DEG C of comminutor, extruding pelletization obtains component B particle.
Component A particle is blended with component B particle：The component A particle and the component B particle are put into mixed at high speed Machine, while add in crosslinking agent and mixed, when temperature reaches 95 DEG C, the mixture after stirring evenly is sent into that pre-heating is extremely In 110 DEG C of comminutor, granulation obtains the heating cable semi-conductive high polymer material.
Performance detection：
1st, electrical property detects, at different temperature the resistivity of detection material, and the relationship of resistivity log and temperature is such as Under：
Table 3
lgρ 4.10 4.10 4.22 5.5 7.3 8.2 7.4
Temperature 30 50 70 90 110 130 150
Under normal circumstances, the control temperature range of self controlled heating cable is at 30~50 DEG C, in the automatic control of heating cable In warm range, resistivity log is more than or equal to 4, and the material has positive temperature coefficient, and electrical property is good.
2nd, physical mechanical property detects
The tensile strength and elongation at break before the material aging and after aging are detected, it is as shown in the table：
Table 4
Tensile strength Elongation at break
Before aging ≥12.5N/mm2 >=150%
After aging ≥12.5N/mm2 >=150%
By the test result of above example it is found that heating cable semi-conductive macromolecule mixture disclosed by the embodiments of the present invention It with excellent positive temperature-coefficient of electrical resistance, is recycled through multiple cold heat, temperature-coefficient of electrical resistance is stablized, and physical mechanical property meets Self controlled heating cable requirement is manufactured, preparation method is simple and convenient to operate, is at low cost.
Embodiment 3
The embodiment of the present invention provides a kind of semi-conductive high polymer material, and the semi-conductive high polymer material includes component A, B Component and crosslinking agent；In terms of parts by weight, the component A includes：
LLDPE：100 parts；Carbon black CB：20 parts；11 parts of clay；Paraffin：8.5 part；BaTiO3：5 parts；
The B component includes：
EVA is 100 parts；Carbon black CB is 20 parts；Antioxidant 1010 is 6.5 parts；Paraffin is 8 parts；
The crosslinking agent is DCP, and parts by weight are 3 parts.
The preparation method of the heating cable semiconductor high polymer material：
It is prepared by component A particle：The component A is added in high-speed mixer and is stirred, when reaching 93 DEG C, after stirring evenly Component A is added in the comminutor of pre-heating to 118 DEG C, and extruding pelletization obtains component A particle.
It is prepared by component B particle：The component B, which is added in high-speed mixer, to be stirred, when reaching 58 DEG C, after stirring evenly Component B be added to and be preheated in 83 DEG C of comminutor, extruding pelletization obtains component B particle.
Component A particle is blended with component B particle：The component A particle and the component B particle are put into mixed at high speed Machine, while add in crosslinking agent and mixed, when temperature reaches 98 DEG C, the mixture after stirring evenly is sent into that pre-heating is extremely In 113 DEG C of comminutor, granulation obtains the heating cable semi-conductive high polymer material.
Performance detection：
1st, electrical property detects, at different temperature the resistivity of detection material, and the relationship of resistivity log and temperature is such as Under：
Table 5
lgρ 4.20 4.26 4.26 5.1 7.21 8.1 7.22
Temperature 30 50 70 90 110 130 150
Under normal circumstances, the control temperature range of self controlled heating cable is at 30~50 DEG C, in the automatic control of heating cable In warm range, resistivity log is more than or equal to 4, and the material has positive temperature coefficient, and electrical property is good.
2nd, physical mechanical property detects
The tensile strength and elongation at break before the material aging and after aging are detected, it is as shown in the table：
Table 6
Tensile strength Elongation at break
Before aging ≥12.5N/mm2 >=150%
After aging ≥12.5N/mm2 >=150%
By the test result of above example it is found that heating cable semi-conductive macromolecule mixture disclosed by the embodiments of the present invention It with excellent positive temperature-coefficient of electrical resistance, is recycled through multiple cold heat, temperature-coefficient of electrical resistance is stablized, and physical mechanical property meets Self controlled heating cable requirement is manufactured, there is good electric conductivity and excellent mechanical performance, it is reusable, and prepare Method is simple and convenient to operate, is at low cost.
Embodiment 4
On the basis of embodiment 1-3, the embodiment of the present invention provides a kind of heating cable, and the heating cable includes tin plating Soft copper stranded conductor, heater element, tincopper fuse wire braided armor and PVC outer jointing jackets；The heater element is by above-mentioned semiconductor High molecular material is made；Two tin plating soft copper stranded conductors are set up in parallel, and the heater element integral type is coated on described The outside of two tin plating soft copper stranded conductors；The tin copper-wire braided layer of crossing is coated on outside the heater element, outside the PVC Sheath is coated on outside the tincopper fuse wire braided armor.
It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to preferable The present invention is described in detail in embodiment, it will be understood by those of ordinary skill in the art that, it can be to the technology of the present invention Scheme is modified or replaced equivalently, and without departing from the spirit and scope of technical solution of the present invention, should all be covered in this hair In bright right.

Claims (3)

1. a kind of semi-conductive high polymer material, which is characterized in that the semi-conductive high polymer material includes component A, B component and friendship Join agent；It is calculated as with parts by weight：
The component A includes：
LLDPE：100 parts；Carbon black CB：20 parts；Clay：10.0~11.0 parts；Paraffin：8.0~8.5 parts；BaTiO3：4.5~5.0 Part；
The B component includes：
EVA：100 parts；Carbon black CB：20 parts；Antioxidant 1010：6.0~6.5 parts；Paraffin：7.5~8.0 parts；And
Crosslinking agent：Crosslinking agent is 2~3 parts of DCP.
2. the preparation method of a kind of semi-conductive high polymer material as described in right wants 1, which is characterized in that the method includes such as Lower step：
Step a:The component A is added in and is stirred into high-speed mixer, reaches 87~93 DEG C, the component A after stirring evenly It is added in the comminutor of pre-heating to 112~118 DEG C, extruding pelletization obtains component A particle；
Step b:The component B is added in high-speed mixer and is stirred, when reaching 52~58 DEG C, by the component after stirring evenly B, which is added to, to be preheated in 77~83 DEG C of comminutor, and extruding pelletization obtains component B particle；
Step c:The component A particle and the component B particle are put into high-speed mixer, while adds in crosslinking agent and is mixed It closes, when temperature reaches 92~98 DEG C, the mixture after stirring evenly is sent into the comminutor of pre-heating to 107~113 DEG C, Granulation obtains the heating cable semi-conductive high polymer material.
3. a kind of heating cable, which is characterized in that including tin plating soft copper stranded conductor, heater element, tincopper fuse wire braided armor and PVC outer jointing jackets；The heater element is made of semiconductor high polymer material described in claim 1；Two described tin plating soft Copper stranded conductor is set up in parallel, and the heater element integral type is coated on the outside of described two tin plating soft copper stranded conductors；Institute It states and crosses tin copper-wire braided layer and be coated on outside the heater element, the PVC oversheaths are coated on the tincopper fuse wire braided armor It is external.
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CN101585943A (en) * 2009-06-18 2009-11-25 上海交通大学 Cable semi-conductive shielding material and preparation method thereof
CN102408606A (en) * 2011-09-02 2012-04-11 西安盖沃热能科技有限公司 Flame-retardant PTC (positive temperature coefficient) polymer electroconductive material and preparation method thereof
CN103804779A (en) * 2012-11-13 2014-05-21 安邦电气集团有限公司 High temperature resistant PTC (positive temperature coefficient) composite material used for automatic temperature limiting electric tracing band cable and preparation method thereof
CN103304875A (en) * 2013-05-24 2013-09-18 安邦电气集团有限公司 PTC composite material and preparation method thereof
CN103396599A (en) * 2013-08-23 2013-11-20 哈尔滨理工大学 Polymer-base PTC (Positive Temperature Coefficient) composite material for self temperature limiting heat tape
CN104582030A (en) * 2013-10-15 2015-04-29 安邦电气集团有限公司 Anti-aging polymer-based self-temperature-limiting heat tracing cable

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