CN115216076B - Heat-conducting polyethylene pipe and preparation method thereof - Google Patents

Heat-conducting polyethylene pipe and preparation method thereof Download PDF

Info

Publication number
CN115216076B
CN115216076B CN202211042965.8A CN202211042965A CN115216076B CN 115216076 B CN115216076 B CN 115216076B CN 202211042965 A CN202211042965 A CN 202211042965A CN 115216076 B CN115216076 B CN 115216076B
Authority
CN
China
Prior art keywords
polyethylene
heat
conducting
fiber
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202211042965.8A
Other languages
Chinese (zh)
Other versions
CN115216076A (en
Inventor
于彦存
张也
史和昌
韩常玉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changchun Institute of Applied Chemistry of CAS
Original Assignee
Changchun Institute of Applied Chemistry of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Changchun Institute of Applied Chemistry of CAS filed Critical Changchun Institute of Applied Chemistry of CAS
Priority to CN202211042965.8A priority Critical patent/CN115216076B/en
Publication of CN115216076A publication Critical patent/CN115216076A/en
Application granted granted Critical
Publication of CN115216076B publication Critical patent/CN115216076B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/33—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles with parts rotatable relative to each other
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • 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
    • C08K7/10—Silicon-containing compounds
    • 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
    • C08K7/14—Glass
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention belongs to the field of high polymer materials, and particularly relates to a heat-conducting polyethylene pipe and a preparation method thereof. The heat-conducting polyethylene pipe provided by the invention is prepared by double-layer coextrusion of a polyethylene composite material; the polyethylene composite material comprises polyethylene and coupling agent modified heat-conducting fibers; in the double-layer coextrusion process, the outer die of the extruder head is kept rotating. The invention uses the coupling agent to carry out chemical modification on the heat-conducting fiber to lead the fiber to contain active functional groups, thereby being capable of being in reactive blending with the polyethylene matrix to form effective molecular combination. On the basis, the die at the outer layer of the machine head is kept rotating in the process of material blending extrusion, so that the blended extruded pipe can form a polyethylene serial crystal structure at a microscopic level, and the pipe can also form a heat conduction three-dimensional network structure at a macroscopic level under different extrusion working conditions of the inner layer and the outer layer, so that the heat conduction performance and the comprehensive mechanical property of the pipe are greatly improved.

Description

Heat-conducting polyethylene pipe and preparation method thereof
Technical Field
The invention belongs to the field of high polymer materials, and particularly relates to a heat-conducting polyethylene pipe and a preparation method thereof.
Background
In recent years, along with the continuous improvement of the economic level of China, people are more and more concerned about the improvement of life quality, in particular to living environment. In north of China, the lowest air temperature can reach about minus 40 ℃ in winter each year. In the eighth nineties, people generally adopt a heating mode for heating in the winter in the cold, and a great deal of geothermal heating mode is started in recent years, but the indoor temperature is often not as good as that of people, and the consumption of fuel is increased to output heat when the ideal temperature is reached, so that the consumption of energy sources is increased, and meanwhile, the environment is polluted. Therefore, on the basis of the same energy consumption, the heat conduction of the pipeline is increased as much as possible, and more heat is consumed, so that the pipeline becomes a current research hot spot.
At present, the ground radiation heating plastic pipe varieties mainly comprise a polypropylene pipe, a polybutylene pipe, a heat-resistant polyethylene pipe, a cross-linked polyethylene pipe and the like, wherein the heat-resistant polyethylene pipe becomes a research hot spot due to the advantages of low temperature resistance, good heat stability, excellent shock resistance, good flexibility, recycling and the like. However, since the heat-resistant polyethylene has a low thermal conductivity, generally about 0.4W/(m·k), how to improve the thermal conductivity of the polyethylene pipe is an important point of study in the art. In addition, in order to better expand the application range of the polyethylene pipe, how to further improve the mechanical properties of the polyethylene pipe is also the research focus in the field.
Disclosure of Invention
In view of the above, the invention aims to provide a heat-conducting polyethylene pipe and a preparation method thereof, and the heat-conducting polyethylene pipe provided by the invention has excellent heat-conducting property and mechanical property.
The invention provides a heat-conducting polyethylene pipe, which is prepared by double-layer coextrusion of a polyethylene composite material;
the polyethylene composite material comprises polyethylene and coupling agent modified heat-conducting fibers;
the coupling agent is one or more of gamma- (methacryloyloxy) propyl trimethoxy silane, triisostearyl isopropyl titanate, distearoyl oxy isopropyl aluminate and trimethylolpropane trimethacrylate;
in the double-layer coextrusion process, the outer die of the extruder head is kept rotating.
Preferably, the weight average molecular weight of the polyethylene is 10 to 40 tens of thousands.
Preferably, the fiber length of the heat conducting fiber is 0.5-10 mm; the fiber diameter of the heat conducting fiber is 1-20 mu m.
Preferably, the polyethylene accounts for 56-93 parts by weight of the heat-conducting polyethylene pipe, the heat-conducting fiber accounts for 5-40 parts by weight of the heat-conducting polyethylene pipe, and the coupling agent accounts for 2-4 parts by weight of the heat-conducting polyethylene pipe.
The invention provides a preparation method of the heat-conducting polyethylene pipe, which comprises the following steps:
and adding the polyethylene composite material into a double-layer pipe extruder, and carrying out double-layer coextrusion under the rotation condition of an outer layer mouth die of the machine head to obtain the heat-conducting polyethylene pipe.
Preferably, the polyethylene composite material is prepared according to the following steps:
and (3) melting, blending and extruding the polyethylene and the coupling agent modified heat-conducting fiber in a blending extruder to obtain the polyethylene composite material.
Preferably, the rotating speed of the blending extruder is 200-350 r/min; the processing temperature of the blending extruder is 160-185 ℃.
Preferably, the coupling agent modified heat-conducting fiber is prepared by the following steps:
spraying the solution of the coupling agent on the surface of the heat-conducting fiber, and drying to obtain the coupling agent modified heat-conducting fiber.
Preferably, the rotation speed of the outer layer die of the machine head of the double-layer pipe extruder is 5-60 r/min, and the axial traction speed is 300-400 mm/min.
Preferably, the barrel temperature of the double-layer pipe extruder is 160-200 ℃, and the die temperature is 155-190 ℃.
Compared with the prior art, the invention provides a heat-conducting polyethylene pipe and a preparation method thereof. The heat-conducting polyethylene pipe provided by the invention is prepared by double-layer coextrusion of a polyethylene composite material; the polyethylene composite material comprises polyethylene and coupling agent modified heat-conducting fibers; the coupling agent is one or more of gamma- (methacryloyloxy) propyl trimethoxy silane, triisostearyl isopropyl titanate, distearoyl oxy isopropyl aluminate and trimethylolpropane trimethacrylate; in the double-layer coextrusion process, the outer die of the extruder head is kept rotating. The invention uses the coupling agent to carry out chemical modification on the heat-conducting fiber to lead the fiber to contain active functional groups, thereby being capable of carrying out reactive blending with the polyethylene matrix to form effective molecular combination and avoiding a series of problems caused by aggregation of the heat-conducting fiber in the matrix. On the basis, the outer layer mouth mould of the machine head is kept rotating in the process of material blending extrusion, so that the material can be overlapped and circularly dragged to flow on the basis of axial traction flow, the flow direction of the material deviates from the axial direction in the process of blending extrusion, and then the fiber structure of the heat conducting fiber is combined, so that the blended extruded pipe can form a polyethylene serial crystal structure on a microscopic level, and the pipe can also form a heat conducting three-dimensional network structure on a macroscopic level under different extrusion working conditions, so that the heat conducting performance and comprehensive mechanical performance of the pipe are greatly improved.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a heat-conducting polyethylene pipe, which is prepared by double-layer coextrusion of a polyethylene composite material; the polyethylene composite material comprises polyethylene and coupling agent modified heat-conducting fibers.
In the heat-conducting polyethylene pipe provided by the invention, the weight average molecular weight of the polyethylene is preferably 10-40 ten thousand, and can be 10 ten thousand, 11 ten thousand, 12 ten thousand, 13 ten thousand, 14 ten thousand, 15 ten thousand, 16 ten thousand, 17 ten thousand, 18 ten thousand, 19 ten thousand, 20 ten thousand, 21 ten thousand, 22 ten thousand, 23 ten thousand, 24 ten thousand, 25 ten thousand, 26 ten thousand, 27 ten thousand, 28 ten thousand, 29 ten thousand, 30 ten thousand, 31 ten thousand, 32 ten thousand, 33 ten thousand, 34 ten thousand, 35 ten thousand, 36 ten thousand, 37 ten thousand, 38 ten thousand, 39 ten thousand or 40 ten thousand.
In the heat-conducting polyethylene pipe provided by the invention, the content of the polyethylene in the heat-conducting polyethylene pipe is 56-93 parts by weight, specifically 56-57 parts by weight, 58 parts by weight, 59 parts by weight, 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight, 73 parts by weight, 74 parts by weight, 75 parts by weight, 76 parts by weight, 77 parts by weight, 78 parts by weight, 79 parts by weight, 80 parts by weight, 81 parts by weight, 82 parts by weight, 83 parts by weight, 84 parts by weight, 85 parts by weight, 86 parts by weight, 87 parts by weight, 88 parts by weight, 89 parts by weight, 90 parts by weight, 91 parts by weight, 92 parts by weight or 93 parts by weight.
In the heat-conducting polyethylene pipe provided by the invention, the coupling agent modified heat-conducting fiber is prepared by modifying the heat-conducting fiber through a coupling agent, and is preferably prepared by spraying a coupling agent solution onto the surface of the heat-conducting fiber and then drying. Wherein the heat conducting fiber is one or more of carbon fiber, glass fiber, basalt fiber and silicon carbide fiber; the fiber length of the heat conducting fiber is preferably 0.5-10 mm, and can be specifically 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm; the fiber diameter of the heat conductive fiber is preferably 1 to 20. Mu.m, and may specifically be 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm or 20. Mu.m.
In the heat-conducting polyethylene pipe provided by the invention, the heat-conducting fibers can be divided into long fibers and short fibers according to the size specification; the length of the long fiber is preferably 5-10 mm, and can be specifically 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm; the long fibers preferably have a fiber diameter of 3 to 20. Mu.m, and specifically may be 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm or 20 μm; the fiber length of the short fiber is preferably 0.5 to less than 5mm, and can be specifically 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm or 4.5mm; the fiber diameter of the staple fibers is preferably 1 to 15. Mu.m, and may specifically be 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm or 15. Mu.m.
In the heat-conducting polyethylene pipe provided by the invention, in some embodiments, the heat-conducting fibers are preferably silicon carbide fibers and basalt fibers, and more preferably silicon carbide fiber long fibers and basalt fiber long fibers; the mass ratio of the silicon carbide fiber long fiber to the basalt fiber long fiber is 28: (8-15), specifically 28:12. In other embodiments, the thermally conductive fibers are preferably carbon fibers and glass fibers, more preferably carbon fiber staple fibers and glass fiber staple fibers; the mass ratio of the carbon fiber short fiber to the glass fiber long fiber is preferably 2: (20-40), specifically 2:30. In other embodiments, the thermally conductive fibers are preferably glass fibers, silicon carbide fibers, and basalt fibers, more preferably glass fiber staple fibers, silicon carbide fiber long fibers, silicon carbide fiber staple fibers, and basalt fibers; the mass ratio of the glass fiber short fibers to the silicon carbide fiber long fibers to the basalt fiber is preferably 1: (0.5-2): (0.5-2): (0.5-2), and may be specifically 1:1:1:1.
In the heat-conducting polyethylene pipe provided by the invention, the content of the heat-conducting fiber in the heat-conducting polyethylene pipe is 5-40 parts by weight, specifically 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight or 40 parts by weight.
In the heat-conducting polyethylene pipe provided by the invention, the coupling agent in the coupling agent modified heat-conducting fiber is one or more of gamma- (methacryloyloxy) propyl trimethoxysilane, isopropyl triisostearoyl titanate, distearoyl oxy isopropyl aluminate and trimethylolpropane trimethacrylate. In some embodiments, the coupling agent is isopropyl triisostearoyl titanate, gamma- (methacryloyloxy) propyl trimethoxysilane, and distearoyloxy isopropyl aluminate, the mass ratio of the isopropyl triisostearoyl titanate, gamma- (methacryloyloxy) propyl trimethoxysilane, and distearoyloxy isopropyl aluminate preferably being 1: (0.5-2): (0.5-2), and may be specifically 1:1:1.
In the heat-conducting polyethylene pipe provided by the invention, the content of the coupling agent in the heat-conducting polyethylene pipe is 2-4 parts by weight, specifically can be 2 parts by weight, 2.1 parts by weight, 2.2 parts by weight, 2.3 parts by weight, 2.4 parts by weight, 2.5 parts by weight, 2.6 parts by weight, 2.7 parts by weight, 2.8 parts by weight, 2.9 parts by weight, 3 parts by weight, 3.1 parts by weight, 3.2 parts by weight, 3.3 parts by weight, 3.4 parts by weight, 3.5 parts by weight, 3.6 parts by weight, 3.7 parts by weight, 3.8 parts by weight, 3.9 parts by weight or 4 parts by weight.
In the heat-conducting polyethylene pipe provided by the invention, the polyethylene composite material is preferably prepared by melt blending and extrusion of polyethylene and coupling agent modified heat-conducting fibers. Wherein, the extruder used for the melt blending extrusion is preferably a twin-screw extruder; the rotating speed of the extruder is preferably 200-350 r/min; the processing temperature of the extruder is preferably 160-185 ℃.
In the heat-conducting polyethylene pipe provided by the invention, the extruder used for double-layer coextrusion is a double-layer pipe extruder, the discharge end of the machine barrel of the extruder is connected with a machine head, and the machine head is provided with a die; the extruder is preferably of a single screw structure, and the screw diameter is preferably 40-50 mm, and particularly can be 45mm. In the double-layer coextrusion process, the outer layer mouth mold of the machine head keeps rotating; the rotation speed of the outer layer die of the machine head is preferably 5-60 r/min; the axial traction speed of the extruder is preferably 300-400 mm/min; the barrel temperature of the extruder is preferably 160-200 ℃, and the die temperature of the extruder is preferably 155-190 ℃.
The invention also provides a preparation method of the heat-conducting polyethylene pipe, which comprises the following steps:
and adding the polyethylene composite material into a double-layer pipe extruder, and carrying out double-layer coextrusion under the rotation condition of an outer layer mouth die of the machine head to obtain the heat-conducting polyethylene pipe.
In the preparation method provided by the invention, the polyethylene composite material is preferably prepared according to the following steps:
and (3) melting, blending and extruding the polyethylene and the coupling agent modified heat-conducting fiber in a blending extruder to obtain the polyethylene composite material.
In the preparation step of the polyethylene composite material provided by the invention, the coupling agent modified heat-conducting fiber is preferably prepared according to the following steps:
spraying the solution of the coupling agent on the surface of the heat-conducting fiber, and drying to obtain the coupling agent modified heat-conducting fiber.
In the preparation step of the coupling agent modified heat-conducting fiber provided by the invention, the solvent in the solution is preferably ethanol; the concentration of the coupling agent in the solution is preferably 1 to 3wt%, and may be specifically 1wt%, 1.2wt%, 1.5wt%, 1.7wt%, 2wt%, 2.3wt%, 2.5wt%, 2.7wt% or 3wt%; the selection of the types of the coupling agent and the heat conducting fiber, and the ratio of the amount of the coupling agent to the amount of the heat conducting fiber are described above, and are not described herein.
In the preparation step of the coupling agent modified heat-conducting fiber provided by the invention, the drying mode is preferably vacuum drying; the drying temperature is preferably 70-90 ℃, and can be specifically 80 ℃; the drying time is preferably 4 to 8 hours, and may be specifically 6 hours.
In the preparation step of the polyethylene composite material provided by the invention, the selection of the polyethylene type and the proportion of the coupling agent and the heat conducting fiber in the polyethylene and the coupling agent modified heat conducting fiber are described above, and are not repeated here.
In the preparation step of the polyethylene composite material provided by the invention, the blending extruder is preferably a double-screw extruder; the rotation speed of the blending extruder is preferably 200-350 r/min, and specifically can be 200r/min, 210r/min, 220r/min, 230r/min, 240r/min, 250r/min, 260r/min, 270r/min, 280r/min, 290r/min, 300r/min, 310r/min, 320r/min, 330r/min, 340r/min or 350r/min; the processing temperature of the blending extruder is preferably 160-185 ℃, and the blending extruder is more preferably provided with seven temperature areas according to the processing temperature: the first area temperature is 160-170 ℃, the second area temperature is 170-180 ℃, the third area temperature is 175-185 ℃, the fourth area temperature is 175-185 ℃, the fifth area temperature is 175-185 ℃, the sixth area temperature is 170-180 ℃, and the seventh area temperature is 160-170 ℃.
In the preparation step of the polyethylene composite material provided by the invention, the material subjected to melt blending extrusion is preferably subjected to granulation after cooling, so that polyethylene composite material particles are obtained.
In the preparation method provided by the invention, the discharge end of the machine barrel of the double-layer pipe extruder is connected with a machine head, and the machine head is provided with a die; the double-layer pipe extruder is preferably of a single-screw structure, and the diameter of a screw is preferably 40-50 mm, and particularly can be 45mm.
In the preparation method provided by the invention, in the double-layer coextrusion process, the rotation speed of the outer layer die of the machine head is preferably 5-60 r/min, and can be specifically 5r/min, 10r/min, 15r/min, 20r/min, 25r/min, 30r/min, 35r/min, 40r/min, 45r/min, 50r/min, 55r/min or 60r/min; the axial traction speed of the double-layer pipe extruder is preferably 300-400 mm/min, and can be specifically 300mm/min, 310mm/min, 320mm/min, 330mm/min, 340mm/min, 350mm/min, 360mm/min, 370mm/min, 380mm/min, 390mm/min or 400mm/min; the barrel temperature of the double-layer pipe extruder is preferably 160-200 ℃, and can be specifically 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃, 195 ℃ or 200 ℃; the die temperature of the double-pipe extruder is preferably 155 to 190 ℃, and specifically 155 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃ or 190 ℃.
According to the technical scheme provided by the invention, the heat-conducting fibers are subjected to chemical modification by using the coupling agent to enable the fibers to contain active functional groups, so that the fibers can be subjected to reactive blending with the polyethylene matrix to form effective molecular combination, and a series of problems caused by aggregation of the heat-conducting fibers in the matrix are avoided. On the basis, the outer layer mouth mould of the machine head is kept rotating in the process of material blending extrusion, so that the material can be overlapped and circularly dragged to flow on the basis of axial traction flow, the flow direction of the material deviates from the axial direction in the process of blending extrusion, and then the fiber structure of the heat conducting fiber is combined, so that the blended extruded pipe can form a polyethylene serial crystal structure on a microscopic level, and the pipe can also form a heat conducting three-dimensional network structure on a macroscopic level under different extrusion working conditions, so that the heat conducting performance and comprehensive mechanical performance of the pipe are greatly improved.
More specifically, the technical scheme of the invention has the following advantages:
1) The heat-conducting property and the comprehensive mechanical property of the polyethylene pipe can be greatly improved, and the application field of the polyethylene pipe is expanded;
2) The method is simple to operate, high in production efficiency, good in economy and good in industrialization prospect.
For the sake of clarity, the following examples and comparative examples are described in detail.
In the following examples and comparative examples provided by the present invention, the performance evaluation methods involved are specifically as follows:
1) Impact performance test: sample preparation and performance test the impact resistance of the plastic pipe is tested according to the requirements of the national standard GB/T14152, a drop hammer impact tester is used for testing, and the final result is the average value of the data measured by five sample bars.
2) And (3) testing heat conduction performance: the tube was cut, the curved surface of the tube was pressed into a sheet at 175 ℃, and then the sheet was formed into a circular flat plate having a diameter of 3cm and a thickness of 3mm, and the thermal conductivity of the material was measured at 25 ℃ using a thermal conductivity meter according to ASTM D5470-2012, and the final result was an average of the data measured by five bars.
Example 1
1) Raw material information:
raw materials Dosage of Parameters (parameters)
Polyethylene 60 parts by weight Weight average molecular weight 40 ten thousand
Silicon carbide fiber long fiber 28 parts by weight The length of the fiber is 8mm and the diameter is 3 mu m
Basalt fiber long fiber 12 parts by weight The length of the fiber is 7mm and the diameter is 3 mu m
Gamma- (methacryloyloxy) propyl trimethoxysilane 2 parts by weight -
Concentration of coupling agent in ethanol 2wt％ -
2) The preparation process comprises the following steps:
preparing a coupling agent into an ethanol solution, spraying the ethanol solution onto the fibers, and then drying the fibers in a vacuum drying oven at 80 ℃ for 6 hours to obtain coupling agent modified heat-conducting fibers;
mixing the coupling agent modified heat-conducting fiber with polyethylene, and then feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 200r/min, and the processing temperature of the extruder is controlled to be seven areas: the first temperature is 170 ℃, the second temperature is 180 ℃, the third temperature is 180 ℃, the fourth temperature is 180 ℃, the fifth temperature is 180 ℃, the sixth temperature is 170 ℃, and the seventh temperature is 170 ℃; cooling to room temperature by air cooling after double screw extrusion, and granulating to obtain polyethylene composite material particles;
adding the polyethylene composite material particles into a double-layer pipe extruder, wherein the extruder is of a single-screw structure, and the diameter of a screw is 45mm; in the operation process of the extruder, the temperature of a machine barrel is 160 ℃, the temperature of a die is 190 ℃, the rotating speed of an outer die is 20r/min, and the axial traction speed is 300mm/min; in the process of processing the material in a double-layer pipe extruder, circumferential dragging flow is overlapped on the basis of axial dragging flow, and finally, the polyethylene pipe is obtained through double-layer coextrusion.
3) Performance test:
the polyethylene pipe is tested for heat conducting property and impact property, and the result is that: thermal conductivity 18 w/(mk), impact strength 22KJ/m 2 。
Example 2
1) Raw material information:
raw materials Dosage of Parameters (parameters)
Polyethylene 91 parts by weight Weight average molecular weight 10 ten thousand
Carbon fiber long fiber 5 parts by weight The length of the fiber is 10mm and the diameter is 3 mu m
Trimethylolpropane trimethacrylate 4 parts by weight -
Concentration of coupling agent in ethanol 1wt％ -
2) The preparation process comprises the following steps:
preparing a coupling agent into an ethanol solution, spraying the ethanol solution onto the fibers, and then drying the fibers in a vacuum drying oven at 80 ℃ for 6 hours to obtain coupling agent modified heat-conducting fibers;
mixing the coupling agent modified heat-conducting fiber with polyethylene, and then feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 350r/min, and the processing temperature of the extruder is controlled to be seven areas: the first temperature is 170 ℃, the second temperature is 180 ℃, the third temperature is 180 ℃, the fourth temperature is 180 ℃, the fifth temperature is 180 ℃, the sixth temperature is 170 ℃, and the seventh temperature is 165 ℃; cooling to room temperature by air cooling after double screw extrusion, and granulating to obtain polyethylene composite material particles;
adding the polyethylene composite material particles into a double-layer pipe extruder, wherein the extruder is of a single-screw structure, and the diameter of a screw is 45mm; in the operation process of the extruder, the temperature of a machine barrel is 200 ℃, the temperature of a die is 155 ℃, the rotation speed of an outer die is 5r/min, and the axial traction speed is 350mm/min; in the process of processing the material in a double-layer pipe extruder, circumferential dragging flow is overlapped on the basis of axial dragging flow, and finally, the polyethylene pipe is obtained through double-layer coextrusion.
3) Performance test:
the polyethylene pipe is tested for heat conducting property and impact property, and the result is that: thermal conductivity 20 w/(mk), impact strength 21KJ/m 2 。
Example 3
1) Raw material information:
raw materials Dosage of Parameters (parameters)
Polyethylene 65 parts by weight Weight average molecular weight 20 ten thousand
Carbon fiber staple 2 parts by weight The length of the fiber is 0.5mm and the diameter is 13 mu m
Glass fiber long fiber 30 parts by weight The length of the fiber is 6mm and the diameter is 2 mum
Distearoyl oxyisopropyl aluminate 3 parts by weight -
Concentration of coupling agent in ethanol 3wt％ -
2) The preparation process comprises the following steps:
preparing a coupling agent into an ethanol solution, spraying the ethanol solution onto the fibers, and then drying the fibers in a vacuum drying oven at 80 ℃ for 6 hours to obtain coupling agent modified heat-conducting fibers;
mixing the coupling agent modified heat-conducting fiber with polyethylene, and then feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 250r/min, and the processing temperature of the extruder is controlled to be seven areas: the first temperature is 170 ℃, the second temperature is 180 ℃, the third temperature is 180 ℃, the fourth temperature is 180 ℃, the fifth temperature is 180 ℃, the sixth temperature is 170 ℃, and the seventh temperature is 170 ℃; cooling to room temperature by air cooling after double screw extrusion, and granulating to obtain polyethylene composite material particles;
adding the polyethylene composite material particles into a double-layer pipe extruder, wherein the extruder is of a single-screw structure, and the diameter of a screw is 45mm; in the operation process of the extruder, the temperature of a machine barrel is 190 ℃, the temperature of a die is 170 ℃, the rotation speed of an outer die is 60r/min, and the axial traction speed is 400mm/min; in the process of processing the material in a double-layer pipe extruder, circumferential dragging flow is overlapped on the basis of axial dragging flow, and finally, the polyethylene pipe is obtained through double-layer coextrusion.
3) Performance test:
the polyethylene pipe is tested for heat conducting property and impact property, and the result is that: thermal conductivity 29 w/(mk), impact strength 26KJ/m 2 。
Example 4
1) Raw material information:
raw materials Dosage of Parameters (parameters)
Polyethylene 58 parts by weight Weight average molecular weight 30 ten thousand
Glass fiber staple 10 parts by weight The length of the fiber is 4mm and the diameter is 15 mu m
Silicon carbide fiber long fiber 10 parts by weight The length of the fiber is 10mm and the diameter is 20 mu m
Silicon carbide fiber staple fiber 10 parts by weight The length of the fiber is 0.5mm and the diameter is 1 mu m
Basalt fiber long fiber 10 parts by weight The length of the fiber is 9mm and the diameter is 15 mu m
Triisostearoyl isopropyl titanate 1 part by weight -
Gamma- (methacryloyloxy) propyl trimethoxysilane 1 part by weight -
Distearoyl oxyisopropyl aluminate 1 part by weight -
Concentration of coupling agent in ethanol 2wt％ -
2) The preparation process comprises the following steps:
preparing a coupling agent into an ethanol solution, spraying the ethanol solution onto the fibers, and then drying the fibers in a vacuum drying oven at 80 ℃ for 6 hours to obtain coupling agent modified heat-conducting fibers;
mixing the coupling agent modified heat-conducting fiber with polyethylene, and then feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 350r/min, and the processing temperature of the extruder is controlled to be seven areas: the first temperature is 170 ℃, the second temperature is 180 ℃, the third temperature is 180 ℃, the fourth temperature is 180 ℃, the fifth temperature is 180 ℃, the sixth temperature is 170 ℃, and the seventh temperature is 165 ℃; cooling to room temperature by air cooling after double screw extrusion, and granulating to obtain polyethylene composite material particles;
adding the polyethylene composite material particles into a double-layer pipe extruder, wherein the extruder is of a single-screw structure, and the diameter of a screw is 45mm; in the operation process of the extruder, the temperature of a machine barrel is 180 ℃, the temperature of a die is 170 ℃, the rotation speed of an outer die is 40r/min, and the axial traction speed is 330mm/min; in the process of processing the material in a double-layer pipe extruder, circumferential dragging flow is overlapped on the basis of axial dragging flow, and finally, the polyethylene pipe is obtained through double-layer coextrusion.
3) Performance test:
the polyethylene pipe is tested for heat conducting property and impact property, and the result is that: thermal conductivity 23 w/(mk), impact strength 25KJ/m 2 。
Comparative example 1
1) Raw material information:
raw materials Dosage of Parameters (parameters)
Polyethylene 100 parts by weight of Weight average molecular weight 40 ten thousand
Heat conducting fiber 0 -
Coupling agent 0 -
2) The preparation process comprises the following steps:
mixing polyethylene, and feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 300r/min, and the processing temperature of the extruder is controlled to be seven areas: the first temperature is 170 ℃, the second temperature is 180 ℃, the third temperature is 180 ℃, the fourth temperature is 180 ℃, the fifth temperature is 180 ℃, the sixth temperature is 170 ℃, and the seventh temperature is 165 ℃; cooling to room temperature by air cooling after double screw extrusion, and granulating to obtain polyethylene particles;
adding the polyethylene particles into a double-layer pipe extruder, wherein the extruder is of a single-screw structure, and the diameter of a screw is 45mm; in the running process of the extruder, the temperature of a machine barrel is 165 ℃, the temperature of a die is 185 ℃, the outer die does not rotate, and the axial traction speed is 300mm/min; in the process of processing the material in a double-layer pipe extruder, the material is axially pulled and flowed, and finally the polyethylene pipe is obtained through double-layer coextrusion.
3) Performance test:
the polyethylene pipe is tested for heat conducting property and impact property, and the result is that: thermal conductivity 0.4 w/(mk), impact strength 10KJ/m 2 。
Comparative example 2
1) Raw material information:
raw materials Dosage of Parameters (parameters)
Polyethylene 80 parts by weight Weight average molecular weight 40 ten thousand
Carbon fiber long fiber 20 parts by weight The length of the fiber is 10mm and the diameter is 3 mu m
Coupling agent 0 -
2) The preparation process comprises the following steps:
mixing the heat-conducting fiber with polyethylene, and then feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 200r/min, and the processing temperature of the extruder is controlled to be seven areas: the first area temperature is 170 ℃, the second area temperature is 180 ℃, the third area temperature is 180 ℃, the fourth area temperature is 180 ℃, the fifth area temperature is 180 ℃, the sixth area temperature is 170 ℃, and the seventh area temperature is 165 ℃; cooling to room temperature by air cooling after double screw extrusion, and granulating to obtain polyethylene composite material particles;
adding the polyethylene composite material particles into a double-layer pipe extruder, wherein the extruder is of a single-screw structure, and the diameter of a screw is 45mm; in the operation process of the extruder, the temperature of a machine barrel is 160 ℃, the temperature of a die is 180 ℃, the rotating speed of an outer die is 30r/min, and the axial traction speed is 300mm/min; in the process of processing the material in a double-layer pipe extruder, circumferential dragging flow is overlapped on the basis of axial dragging flow, and finally, the polyethylene pipe is obtained through double-layer coextrusion.
3) Performance test:
the polyethylene pipe is tested for heat conducting property and impact property, and the result is that: thermal conductivity 11 w/(mk), impact strength 17KJ/m 2 。
Comparative example 3
1) Raw material information:
raw materials Dosage of Parameters (parameters)
Polyethylene 96 parts by weight Weight average molecular weight 40 ten thousand
Heat conducting fiber 0 -
Gamma- (methacryloyloxy) propyl trimethoxysilane 4 parts by weight -
Concentration of coupling agent in ethanol 4wt％ -
2) The preparation process comprises the following steps:
mixing a coupling agent ethanol solution with polyethylene, and then feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 250r/min, and the processing temperature of the extruder is controlled to be seven areas: the first temperature is 170 ℃, the second temperature is 180 ℃, the third temperature is 180 ℃, the fourth temperature is 180 ℃, the fifth temperature is 180 ℃, the sixth temperature is 170 ℃, and the seventh temperature is 165 ℃; cooling to room temperature by air cooling after double screw extrusion, and granulating to obtain modified polyethylene particles;
adding the modified polyethylene particles into a double-layer pipe extruder, wherein the extruder is of a single-screw structure, and the diameter of a screw is 45mm; in the operation process of the extruder, the temperature of a machine barrel is 170 ℃, the temperature of a die is 190 ℃, the rotation speed of an outer die is 35r/min, and the axial traction speed is 250mm/min; in the process of processing the material in a double-layer pipe extruder, circumferential dragging flow is overlapped on the basis of axial dragging flow, and finally, the polyethylene pipe is obtained through double-layer coextrusion.
3) Performance test:
the polyethylene pipe is tested for heat conducting property and impact property, and the result is that: thermal conductivity 5 w/(mk), impact strength 11KJ/m 2 。
Comparative example 4
1) Raw material information:
raw materials Dosage of Parameters (parameters)
Polyethylene 65 parts by weight Weight average molecular weight 20 ten thousand
Carbon fiber staple 2 parts by weight The length of the fiber is 0.5mm and the diameter is 13 mu m
Glass fiber long fiber 30 parts by weight The length of the fiber is 6mm and the diameter is 2 mu m
Distearoyl oxyisopropyl aluminate 3 parts by weight -
Concentration of coupling agent in ethanol 3wt％ -
2) The preparation process comprises the following steps:
preparing a coupling agent into an ethanol solution, spraying the ethanol solution onto the fibers, and then drying the fibers in a vacuum drying oven at 80 ℃ for 6 hours to obtain coupling agent modified heat-conducting fibers;
mixing the coupling agent modified heat-conducting fiber with polyethylene, and then feeding the mixture into a double-screw extruder, wherein the rotating speed of the double-screw extruder is 250r/min, and the processing temperature of the extruder is controlled to be seven areas: the first temperature is 170 ℃, the second temperature is 180 ℃, the third temperature is 180 ℃, the fourth temperature is 180 ℃, the fifth temperature is 180 ℃, the sixth temperature is 170 ℃, and the seventh temperature is 170 ℃; cooling to room temperature by air cooling after double screw extrusion, and granulating to obtain polyethylene composite material particles;
adding the polyethylene composite material particles into a double-layer pipe extruder, wherein the extruder is of a single-screw structure, and the diameter of a screw is 45mm; in the running process of the extruder, the temperature of the machine barrel is 190 ℃, the temperature of the die is 170 ℃, the outer die does not rotate, and the axial traction speed is 400mm/min; in the process of processing the material in a double-layer pipe extruder, circumferential dragging flow is overlapped on the basis of axial dragging flow, and finally, the polyethylene pipe is obtained through double-layer coextrusion.
3) Performance test:
the polyethylene pipe is tested for heat conducting property and impact property, and the result is that: thermal conductivity 18 w/(mk), impact strength 20KJ/m 2 。
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (7)

1. A heat-conducting polyethylene pipe is prepared by double-layer coextrusion of a polyethylene composite material;
the polyethylene composite material comprises polyethylene and coupling agent modified heat-conducting fibers;
the heat conducting fibers in the coupling agent modified heat conducting fibers are carbon fiber short fibers and glass fiber long fibers, or are glass fiber short fibers, silicon carbide fiber long fibers, silicon carbide fiber short fibers and basalt fiber long fibers, wherein the fiber length of the long fibers is 5-10 mm, the fiber diameter of the long fibers is 3-20 mu m, the fiber length of the short fibers is 0.5-less than 5mm, and the fiber diameter of the short fibers is 1-15 mu m;
the coupling agent in the coupling agent modified heat-conducting fiber is distearoyl oxygen isopropyl aluminate or triisostearyl titanic acid isopropyl ester, gamma- (methacryloyloxy) propyl trimethoxy silane and distearoyl oxygen isopropyl aluminate;
the weight portion of the polyethylene in the heat-conducting polyethylene pipe is 56-70 parts, the weight portion of the heat-conducting fiber in the heat-conducting polyethylene pipe is 30-40 parts, and the weight portion of the coupling agent in the heat-conducting polyethylene pipe is 2-4 parts;
in the double-layer coextrusion process, the rotation speed of the outer layer die of the machine head of the extruder is 5-60 r/min, and the axial traction speed is 300-400 mm/min.
2. The thermally conductive polyethylene pipe of claim 1, wherein the polyethylene has a weight average molecular weight of 10 to 40 tens of thousands.
3. A method of making a thermally conductive polyethylene pipe according to any one of claims 1-2, comprising the steps of:
adding the polyethylene composite material into a double-layer pipe extruder, and carrying out double-layer coextrusion under the rotation condition of an outer layer mouth mold of a machine head to obtain a heat-conducting polyethylene pipe;
the rotation speed of the outer layer die of the machine head of the double-layer pipe extruder is 5-60 r/min, and the axial traction speed is 300-400 mm/min.
4. The method of claim 3, wherein the polyethylene composite material is prepared by:
and (3) melting, blending and extruding the polyethylene and the coupling agent modified heat-conducting fiber in a blending extruder to obtain the polyethylene composite material.
5. The method according to claim 4, wherein the rotational speed of the blending extruder is 200 to 350r/min; the processing temperature of the blending extruder is 160-185 ℃.
6. The preparation method of claim 4, wherein the coupling agent modified heat conducting fiber is prepared by the following steps:
spraying the solution of the coupling agent on the surface of the heat-conducting fiber, and drying to obtain the coupling agent modified heat-conducting fiber.
7. The process according to claim 3, wherein the barrel temperature of the double-pipe extruder is 160 to 200℃and the die temperature is 155 to 190 ℃.
CN202211042965.8A 2022-08-29 2022-08-29 Heat-conducting polyethylene pipe and preparation method thereof Active CN115216076B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211042965.8A CN115216076B (en) 2022-08-29 2022-08-29 Heat-conducting polyethylene pipe and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211042965.8A CN115216076B (en) 2022-08-29 2022-08-29 Heat-conducting polyethylene pipe and preparation method thereof

Publications (2)

Publication Number Publication Date
CN115216076A CN115216076A (en) 2022-10-21
CN115216076B true CN115216076B (en) 2023-12-19

Family

ID=83616946

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211042965.8A Active CN115216076B (en) 2022-08-29 2022-08-29 Heat-conducting polyethylene pipe and preparation method thereof

Country Status (1)

Country Link
CN (1) CN115216076B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469429A1 (en) * 1979-11-16 1981-05-22 Comp Generale Electricite Polyethylene compsn. - with high thermal conductivity and strength, contg. a mixt. of carbon black and carbon fibres or graphite powder
CN102408610A (en) * 2011-11-14 2012-04-11 联塑市政管道（河北）有限公司 Functional polyethylene pipe and preparation method thereof
CN103172924A (en) * 2013-04-17 2013-06-26 天津大学 High-thermal conductivity polymer composite material and preparation method thereof
CN104045896A (en) * 2014-06-09 2014-09-17 北京华创瑞风空调科技有限公司 Heat-conductive polyethylene composite material and preparation method thereof
CN104559145A (en) * 2014-12-16 2015-04-29 惠州力王佐信科技有限公司 High-toughness and high-thermal-conductivity polymer material and preparation method thereof
CN105017667A (en) * 2014-04-30 2015-11-04 上海楚堰实业有限公司 Anti-impact heat conduction material and preparation method thereof
CN105131385A (en) * 2015-07-29 2015-12-09 天津金发新材料有限公司 High-oxygen barrier property high-strength polyolefin heat conduction pipe and preparation method thereof
CN107641235A (en) * 2017-09-22 2018-01-30 辽宁利浩管业股份有限公司 Build composite polyethylene material of space heat conduction network and preparation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469429A1 (en) * 1979-11-16 1981-05-22 Comp Generale Electricite Polyethylene compsn. - with high thermal conductivity and strength, contg. a mixt. of carbon black and carbon fibres or graphite powder
CN102408610A (en) * 2011-11-14 2012-04-11 联塑市政管道（河北）有限公司 Functional polyethylene pipe and preparation method thereof
CN103172924A (en) * 2013-04-17 2013-06-26 天津大学 High-thermal conductivity polymer composite material and preparation method thereof
CN105017667A (en) * 2014-04-30 2015-11-04 上海楚堰实业有限公司 Anti-impact heat conduction material and preparation method thereof
CN104045896A (en) * 2014-06-09 2014-09-17 北京华创瑞风空调科技有限公司 Heat-conductive polyethylene composite material and preparation method thereof
CN104559145A (en) * 2014-12-16 2015-04-29 惠州力王佐信科技有限公司 High-toughness and high-thermal-conductivity polymer material and preparation method thereof
CN105131385A (en) * 2015-07-29 2015-12-09 天津金发新材料有限公司 High-oxygen barrier property high-strength polyolefin heat conduction pipe and preparation method thereof
CN107641235A (en) * 2017-09-22 2018-01-30 辽宁利浩管业股份有限公司 Build composite polyethylene material of space heat conduction network and preparation method thereof

Also Published As

Publication number Publication date
CN115216076A (en) 2022-10-21

Similar Documents

Publication Publication Date Title
CN104448813B (en) Glass fiber reinforced polyamide 66 composite material, and preparation method and application thereof
CN102220659B (en) Preparation method of heat-resistant polyphenylene sulfide fiber
CN103435998B (en) A kind of method preparing high-ductility heat conduction functional composite material
CN101805472B (en) Regeneration high-density polyethylene (HDPE) particle used for tubings and manufacture method thereof
CN101564874B (en) Method for preparing nanometer heat-insulation composite material
CN100567601C (en) Modified polyphenyl thioether fibre and preparation method thereof
CN104723528B (en) Process for producing polymer modified asphalt waterproof coil
CN102532884A (en) Nylon 66 composition capable of being used in automobile radiator covers and preparing method thereof
CN105235175A (en) Efficient screw extruder
CN111421932A (en) Anti-scaling plastic pipe with far infrared radiation function and preparation method thereof
CN101644360A (en) Antibacterial oxygen obstructing composite pipe and preparation method thereof
CN104086924A (en) Carbon fiber-reinforced thermoplastic resin composite material and preparation method thereof
CN115216076B (en) Heat-conducting polyethylene pipe and preparation method thereof
CN1328309C (en) Conductive composite materials with positive temperature coefficient effect and process for making same
CN102532829B (en) Method for preparing high-temperature resistant plastic pipes for transferring hot spring
CN103205044A (en) Silane grafted polyethylene thermally conductive composite material and preparation method and application thereof
CN201343584Y (en) Cooling and anti-blocking device of vacuum twin-screw extruding machine
CN113357446A (en) Self-cleaning floor heating pipeline and preparation method thereof
CN103350497B (en) A kind of Special precision extrusion system for polyvinylidene fluoride
CN113308752A (en) Anti-counterfeiting fiber preparation method and anti-counterfeiting fiber
CN108003613A (en) A kind of nylon of resistance to alcohol and preparation method thereof
CN115612211A (en) Conductive polypropylene composite material and preparation method thereof
CN213412585U (en) Melting and mixing device for plastic granulation
CN203317725U (en) Special precision extrusion device for polyvinylidene fluoride (PVDF)
CN102086535A (en) Method for preparing polyvinyl alcohol coarse denier monofilament fiber

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant