FR2469429A1 - Polyethylene compsn. - with high thermal conductivity and strength, contg. a mixt. of carbon black and carbon fibres or graphite powder - Google Patents

Polyethylene compsn. - with high thermal conductivity and strength, contg. a mixt. of carbon black and carbon fibres or graphite powder Download PDF

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Publication number
FR2469429A1
FR2469429A1 FR7928289A FR7928289A FR2469429A1 FR 2469429 A1 FR2469429 A1 FR 2469429A1 FR 7928289 A FR7928289 A FR 7928289A FR 7928289 A FR7928289 A FR 7928289A FR 2469429 A1 FR2469429 A1 FR 2469429A1
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Prior art keywords
graphite powder
carbon black
thermal conductivity
pref
carbon
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Granted
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FR7928289A
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French (fr)
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FR2469429B1 (en
Inventor
Christian Reinaudo
Bernard Hochon
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Alcatel Lucent SAS
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Compagnie Generale dElectricite SA
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Priority to FR7928289A priority Critical patent/FR2469429B1/en
Publication of FR2469429A1 publication Critical patent/FR2469429A1/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/04—Particle-shaped
    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/06—Elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S70/00—Details of absorbing elements
    • F24S70/10—Details of absorbing elements characterised by the absorbing material
    • F24S70/14—Details of absorbing elements characterised by the absorbing material made of plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S2080/01—Selection of particular materials
    • F24S2080/015—Plastics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Combustion & Propulsion (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Plastic compsn. with high thermal conductivity and good mechanical strength is comprised at least partially of HDPE with a filler consisting of carbon black with an addn. of at least ca. 7 wt.% carbon fibres or graphite powder w.r.t. matrix polymer. Pref. the carbon fibres are 1-3 mm long when incorporated into the plastic, and have a dia. of ca. 8 microns. The graphite powder pref. has a particle size of ca. 5 microns. Pref. matrix polymer is a mixt. of 50-80 wt.% HDPE and 20-50 wt.% ethylene-propylene copolymer. The compsn. pref. contains ca. 1.5 wt.% (w.r.t. ethylene-propylene) of a coupling agent (RO)-Ti-(O-X-R2-Y)3 in which R, R2, X and Y are respectively alkyl, aromatic gp., sulphonyl gp. and H. The prods. are esp. useful in the prodn. of heat exchangers which exhibit less scale formation and corrosion by water than prior art carbon black filled polyethylene based compsns. (c.f. FR application 79FR016375).

Description

Matériau plastique à conductibilité thermique élevée et bonne résistance mécanique
La présente invention concerne un matériau plastique à conduc tibilite, thermique élevée et bonne résistance mécanique, à matrice polymère comprenant au moins du polyéthylène à haute densité, avec une charge de noir de carbone.Plastic material with high thermal conductivity and good mechanical resistance
The present invention relates to a plastic material with high conductivity, high thermal conductivity and good mechanical strength, with a polymer matrix comprising at least high density polyethylene, with a charge of carbon black.

La demande de brevet français n0 79 16375 du 26 juin 1979 de la demanderesse porte sur un matériau de ce genre, dans lequel la matrice polymère est formée par un mélange de 50 à 80% en poids de polyéthylène à haute densité et de 20 à 50% en poids de copolymère éth#%éne-pkopylène, et la charge par du noir de carbone de surface 2 spécifique au moins 100 m2/g, en proportion d'au moins 50% en poids, rapportés au poids de matrice polymère. French patent application No. 79 16375 of June 26, 1979 of the applicant relates to a material of this kind, in which the polymer matrix is formed by a mixture of 50 to 80% by weight of high density polyethylene and 20 to 50 % by weight of eth #% copolymer ene-pkopylène, and the charge with carbon black with a specific surface 2 at least 100 m2 / g, in proportion at least 50% by weight, based on the weight of polymer matrix.

Bien que le matériau plastique ainsi défini possède une conductibilité thermique élevée, il était souhaitable de l'améliorer encore pour lui permettre de trouver des applications en échange de chaleur dans des domaines où l'on utilisait jusqu'à présent les métaux, en dépit des inconvénients, notamment entartrage et corrosion par l'eau, qu'ils présentent. Although the plastic material thus defined has a high thermal conductivity, it was desirable to improve it further to enable it to find applications in exchange for heat in areas where metals have been used until now, despite the disadvantages, in particular scaling and corrosion by water, which they present.

La présente invention a donc pour but de procurer un matériau plastique de conductibilité thermique améliorée par rapport à celle du matériau de la demande de brevet ci-dessus. The present invention therefore aims to provide a plastic material with improved thermal conductivity compared to that of the material of the above patent application.

Le matériau plastique selon l'invention est caractérisé en ce que sa charge de noir de carbone est additionnée d'au moins environ 7% en poids de fibres de carbone ou de poudre de graphite, rapportés au poids de matériau polymère. The plastic material according to the invention is characterized in that its carbon black load is added with at least about 7% by weight of carbon fibers or graphite powder, based on the weight of polymeric material.

Il répond en outre de préférence à au moins l'une des caractéristiques suivantes - La longueur des fibres de carbone est de 1 à 3 mm environ au moment où elles sont incorporées au matériau plastique. It also preferably meets at least one of the following characteristics - The length of the carbon fibers is approximately 1 to 3 mm when they are incorporated into the plastic material.

- Le diamètre moyen des fibres de carbone est d'environ 8 microns.- The average diameter of the carbon fibers is approximately 8 microns.

La dimension moyenne de particule de la poudre de graphite est d'environ 5 microns. The average particle size of the graphite powder is about 5 microns.

il est décrit ci-après, à titre d'exemple, la fabrication de matériaux plastiques selon l'invention, dont la charge de noir de carbone est additionnée, soit de fibres de carbone, soit de poudre de graphite. it is described below, by way of example, the manufacture of plastic materials according to the invention, in which the charge of carbon black is added, either with carbon fibers, or with graphite powder.

On fond d'abord dans un mélangeur vers 1500-1600C, une quantité déterminée de copolymère éthylène-propylène, à laquelle on ajoute environ 1,5% en poids d'un agent de couplage formé par un titanate organique répondant à la formule (RO) -Ti-(O-X-R2-Y) 3, dans laquelle
R, R2 X et Y désignent respectivement les radicaux alkyle, aromatique, le groupe sulfonyle et l'hydrogène, et vendu sous la désignation commerciale KR-9S par Kenrich Petrochemicals.First, in a mixer at around 1500-1600C, a determined quantity of ethylene-propylene copolymer is melted, to which about 1.5% by weight of a coupling agent formed by an organic titanate corresponding to the formula (RO) is added. ) -Ti- (OX-R2-Y) 3, in which
R, R2 X and Y denote respectively the alkyl and aromatic radicals, the sulfonyl group and hydrogen, and sold under the trade designation KR-9S by Kenrich Petrochemicals.

La fonction de cet agent de couplage est d'assurer la fixation ultérieure des particules de noir de carbone sur des sites privilégiés des chaines de polymère, ce qui permet en particulier d'améliorer la résistance au choc du matériau chargé. The function of this coupling agent is to ensure the subsequent fixation of the carbon black particles on privileged sites of the polymer chains, which in particular makes it possible to improve the impact resistance of the loaded material.

On ajoute également à titre d'agent anti-oxydant un mélange de polyphénol alcoylé tétrakisLméthylène#3 (3', 5'- di-t-butyl-4' -hydroxyphény#propionate#méthane, vendu sous la désignation commerciale Irganox 1010 par la société Ciba-Geigy, et de distéarylthiodipropionate, vendu sous la désignation commerciale Irganox PS 802 par la même société. On ajoute alors 2 parties en poids de polyéthylène à haute densité par partie de copolymère éthylène-propylène, en continuant le mélange. Also added as antioxidant is a mixture of alkylated polyphenol tetrakisLmethylene # 3 (3 ', 5'- di-t-butyl-4' -hydroxypheny # propionate # methane, sold under the trade name Irganox 1010 by Ciba-Geigy, and distearylthiodipropionate, sold under the trade name Irganox PS 802 by the same company, then 2 parts by weight of high density polyethylene are added per part of ethylene-propylene copolymer, continuing the mixing.

Les deux polymères étant bien mélangés, on ajoute en plusieurs fois 80% en poids du noir de carbone vendu sous la désignation Vulcan
XC 72 par la société Cabot, de surface spécifique 254 m2/g et de dimension moyenne de particule 0,03 micron. Puis on ajoute 10% en poids de fibres courtes de carbone de longueur 1 à 3 mm et de diamètre moyen 8 microns, commercialisées par la société Serofim. Lorsque l'ensemble de la charge est bien mélangée aux polymères, on retire le matériau du mélangeur et le laisse se solidifier. Il possède une conductibilité thermique de 5 à 10 fois supérieure selon les proportions, de bonnes propriétés mécaniques et une bonne résistance au vieillissement. Il peut être mis en forme de pièces profilées par extrusion.Il est certain que les fibres s'orientant dans une certaine mesure parallèlement à l'axe d'extrusion, créent des liaisons physiques entre les particules de noir de carbone et améliorent la conductibilité thermique principalement dans la direction de leur orientation. The two polymers being well mixed, 80% by weight of the carbon black sold under the designation Vulcan is added in several installments
XC 72 by Cabot, with a specific surface of 254 m2 / g and an average particle size of 0.03 micron. Then 10% by weight of short carbon fibers of length 1 to 3 mm and of average diameter 8 microns, sold by the company Serofim, are added. When all of the filler is well mixed with the polymers, the material is removed from the mixer and allowed to solidify. It has a thermal conductivity of 5 to 10 times higher depending on the proportions, good mechanical properties and good resistance to aging. It can be shaped into profiled parts by extrusion. It is certain that the fibers which orient themselves to a certain extent parallel to the extrusion axis, create physical bonds between the carbon black particles and improve the thermal conductivity. mainly in the direction of their orientation.

Si l'on veut utiliser comme adjuvant de la charge de noir de carbone de la poudre de graphite, on procède comme précédemment, mais remplace les fibres de carbone par la même quantité de poudre de graphite naturel de dimension moyenne de particule 5 microns. If we want to use graphite powder as a carbon black filler, we proceed as before, but replace the carbon fibers with the same amount of natural graphite powder with an average particle size of 5 microns.

Il se produit également à l'extrusion une orientation préférentielle des plans des particules de graphite selon Loaxe de l'extrusion.There also occurs in the extrusion a preferential orientation of the planes of the graphite particles according to the axis of the extrusion.

Bien que les matériaux dont la fabrication vient d'etre décrite paraissent les formes de réalisation préférables de l'invention, on comprendra que diverses modifications peuvent leur etre apportées sans sortir du centre de l'invention, certains de leurs constituants pouvant être remplacés par d'autres qui joueraient un rôle technique analogue. En particulier, on peut utiliser d'autres antioxydants et d'autres agents de couplage, notamment du groupe des silanes. Although the materials whose manufacture has just been described appear to be the preferred embodiments of the invention, it will be understood that various modifications can be made to them without departing from the center of the invention, some of their constituents being able to be replaced by d others who would play a similar technical role. In particular, other antioxidants and other coupling agents can be used, in particular from the group of silanes.

En vue d'obtenir une bonne résistance au feu, on peut remplacer le copolymère éthylène-propylène de la matrice par du polyéthylène chloré, comme défini dans la demande de brevet déposée ce même jour par la
Demanderesse pour "Matériau plastique résistant au feu, à conductibilité thermique élevée et bonne résistance mécanique".In order to obtain good fire resistance, the ethylene-propylene copolymer of the matrix can be replaced by chlorinated polyethylene, as defined in the patent application filed the same day by
Applicant for "Fire resistant plastic material, with high thermal conductivity and good mechanical resistance".

Le matériau de l'invention s'applique notamment à la fabrication de convecteurs d'échange de chaleur à air pour pièces d'habitation ou bien à eau pour capteurs solaires, ainsi qu'à l'encapsulation de matières de stockage de chaleur.  The material of the invention is particularly applicable to the manufacture of air heat exchange convectors for living rooms or to water for solar collectors, as well as the encapsulation of heat storage materials.

Claims (4)

REVENDICATIONS 1/ Matériau plastique à conductibilité thermique élevée et bonne résistance mécanique, à matrice polymère comprenant au moins du polyéthylène à haute densité, avec une charge de noir de carbone, caractérisé en ce que la charge de noir de carbone est additionnée d'au moins environ 7% en poids de fibres de carbone ou de poudre de graphite, rapportés au poids de matrice polymère.1 / Plastic material with high thermal conductivity and good mechanical strength, with a polymer matrix comprising at least high density polyethylene, with a carbon black filler, characterized in that the carbon black filler is added with at least approximately 7% by weight of carbon fibers or graphite powder, based on the weight of polymer matrix. 2/ Matériau plastique selon la revendication 1, caractérisé en ce que la longueur des fibres de carbone est de 1 à 3 mm environ au moment où elles sont incorporées au matériau plastique.2 / plastic material according to claim 1, characterized in that the length of the carbon fibers is from 1 to 3 mm approximately when they are incorporated into the plastic material. 3/ Matériau plastique selon la revendication 2, caractérisé en ce que le diamètre moyen des fibres de carbone est d'environ 8 microns.3 / plastic material according to claim 2, characterized in that the average diameter of the carbon fibers is approximately 8 microns. 4/ Matériau plastique selon la revendication 1, caractérisé en ce que la dimension moyenne de particule de la poudre de graphite est d'environ 5 microns. 4 / plastic material according to claim 1, characterized in that the average particle size of the graphite powder is about 5 microns.
FR7928289A 1979-11-16 1979-11-16 PLASTIC MATERIAL WITH HIGH THERMAL CONDUCTIVITY AND GOOD MECHANICAL STRENGTH Expired FR2469429B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7928289A FR2469429B1 (en) 1979-11-16 1979-11-16 PLASTIC MATERIAL WITH HIGH THERMAL CONDUCTIVITY AND GOOD MECHANICAL STRENGTH

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FR7928289A FR2469429B1 (en) 1979-11-16 1979-11-16 PLASTIC MATERIAL WITH HIGH THERMAL CONDUCTIVITY AND GOOD MECHANICAL STRENGTH

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FR2469429B1 FR2469429B1 (en) 1986-06-27

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2494180A1 (en) * 1980-11-19 1982-05-21 Comp Generale Electricite Making plastic profiles or sheet - with enhanced transverse thermal conductivity, by extrusion via an annular choke to reorientate conductive fillers
US6114433A (en) * 1998-03-17 2000-09-05 Industrial Technology Research Institute PTC conductive polymer composition
EP1070738A1 (en) * 1998-03-25 2001-01-24 SANYO ELECTRIC Co., Ltd. Thermally conductive organic material
EP1277807A2 (en) * 2001-07-18 2003-01-22 Mitsubishi Engineering-Plastics Corporation Thermoplastic resin composition
FR3029204A1 (en) * 2014-12-01 2016-06-03 Commissariat Energie Atomique THERMALLY CONDUCTIVE COMPOSITE MATERIAL AND PROCESS FOR PRODUCING THERMALLY CONDUCTIVE COMPOSITE MATERIAL.
CN110835432A (en) * 2019-11-29 2020-02-25 四川大学 Polymer-based heat-conducting composite material and preparation method and application thereof
US20200353564A1 (en) * 2019-05-08 2020-11-12 Clack Corporation Fluid Treatment Tank Having A Laser Welded Distributor Plate
CN115216076A (en) * 2022-08-29 2022-10-21 中国科学院长春应用化学研究所 Heat-conducting polyethylene pipe and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1229319A (en) * 1958-07-04 1960-09-06 South African Council Scientif Materials and their moldings having good insulating properties and high chemical resistance
FR2139653A1 (en) * 1971-05-28 1973-01-12 Rhone Poulenc Sa
GB2002782A (en) * 1977-07-04 1979-02-28 Agency Ind Science Techn Carbon fibre-thermoplastic resin composite

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1229319A (en) * 1958-07-04 1960-09-06 South African Council Scientif Materials and their moldings having good insulating properties and high chemical resistance
FR2139653A1 (en) * 1971-05-28 1973-01-12 Rhone Poulenc Sa
GB2002782A (en) * 1977-07-04 1979-02-28 Agency Ind Science Techn Carbon fibre-thermoplastic resin composite

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2494180A1 (en) * 1980-11-19 1982-05-21 Comp Generale Electricite Making plastic profiles or sheet - with enhanced transverse thermal conductivity, by extrusion via an annular choke to reorientate conductive fillers
US6114433A (en) * 1998-03-17 2000-09-05 Industrial Technology Research Institute PTC conductive polymer composition
EP1070738A1 (en) * 1998-03-25 2001-01-24 SANYO ELECTRIC Co., Ltd. Thermally conductive organic material
EP1277807A2 (en) * 2001-07-18 2003-01-22 Mitsubishi Engineering-Plastics Corporation Thermoplastic resin composition
EP1277807A3 (en) * 2001-07-18 2003-08-20 Mitsubishi Engineering-Plastics Corporation Thermoplastic resin composition
US7008991B2 (en) 2001-07-18 2006-03-07 Mitsubishi Engineering-Plastics Corporation Thermoplastic resin composition
FR3029204A1 (en) * 2014-12-01 2016-06-03 Commissariat Energie Atomique THERMALLY CONDUCTIVE COMPOSITE MATERIAL AND PROCESS FOR PRODUCING THERMALLY CONDUCTIVE COMPOSITE MATERIAL.
US20200353564A1 (en) * 2019-05-08 2020-11-12 Clack Corporation Fluid Treatment Tank Having A Laser Welded Distributor Plate
CN110835432A (en) * 2019-11-29 2020-02-25 四川大学 Polymer-based heat-conducting composite material and preparation method and application thereof
CN115216076A (en) * 2022-08-29 2022-10-21 中国科学院长春应用化学研究所 Heat-conducting polyethylene pipe and preparation method thereof
CN115216076B (en) * 2022-08-29 2023-12-19 中国科学院长春应用化学研究所 Heat-conducting polyethylene pipe and preparation method thereof

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Publication number Publication date
FR2469429B1 (en) 1986-06-27

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