CN114484090B - Pressure-resistant foam plastic foaming heat-insulating pipe and preparation method thereof - Google Patents
Pressure-resistant foam plastic foaming heat-insulating pipe and preparation method thereof Download PDFInfo
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- CN114484090B CN114484090B CN202210008824.8A CN202210008824A CN114484090B CN 114484090 B CN114484090 B CN 114484090B CN 202210008824 A CN202210008824 A CN 202210008824A CN 114484090 B CN114484090 B CN 114484090B
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- 238000005187 foaming Methods 0.000 title claims abstract description 57
- 239000006260 foam Substances 0.000 title claims abstract description 23
- 239000004033 plastic Substances 0.000 title claims abstract description 20
- 229920003023 plastic Polymers 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000004698 Polyethylene Substances 0.000 claims abstract description 40
- 238000009413 insulation Methods 0.000 claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 239000007822 coupling agent Substances 0.000 claims abstract description 9
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical group [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 8
- OJMOMXZKOWKUTA-UHFFFAOYSA-N aluminum;borate Chemical compound [Al+3].[O-]B([O-])[O-] OJMOMXZKOWKUTA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000011591 potassium Substances 0.000 claims abstract description 8
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 8
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 7
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 7
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 6
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 6
- 239000002270 dispersing agent Substances 0.000 claims abstract description 6
- 239000004088 foaming agent Substances 0.000 claims abstract description 6
- 230000002787 reinforcement Effects 0.000 claims abstract description 5
- 238000013329 compounding Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 12
- 238000005253 cladding Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 7
- 239000004156 Azodicarbonamide Substances 0.000 claims description 6
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 6
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000002530 phenolic antioxidant Substances 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 5
- 150000004645 aluminates Chemical class 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 claims description 3
- RGSFGYAAUTVSQA-UHFFFAOYSA-N pentamethylene Natural products C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 claims description 3
- -1 pentamethylene tetramine Chemical compound 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 2
- 229940088560 citric acid / sodium bicarbonate Drugs 0.000 claims description 2
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 39
- 210000004027 cell Anatomy 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 238000004513 sizing Methods 0.000 description 5
- 238000004321 preservation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 210000000497 foam cell Anatomy 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/133—Rigid pipes of plastics with or without reinforcement the walls consisting of two layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0085—Use of fibrous compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/065—HDPE, i.e. high density polyethylene
-
- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
-
- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- 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
- C08K7/08—Oxygen-containing compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Thermal Insulation (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Abstract
The invention discloses a pressure-resistant foam plastic foaming heat-insulating pipe which is formed by compounding an inner layer pipe and an outer layer pipe, wherein the inner layer pipe is PE or PP, the outer layer pipe is a PE modified foaming layer, and the PE modified foaming layer comprises the following components in parts by weight: 100 parts of matrix resin; 1-3 parts of foaming agent; 5-10 parts of reinforcing body; 1-3 parts of an antioxidant; 1-3 parts of dispersing agent and 2-3 parts of coupling agent; the matrix resin is one of PE-RT or HDPE powder, and the reinforcement is potassium hexatitanate whisker and aluminum borate whisker; the invention also discloses a preparation method of the pipe. According to the invention, by designing the two layers of composite pipelines, the inner layer pipe is PE or PP with good heat resistance, the outer layer pipe is a PE modified foaming layer, and the PE modified foaming layer has very high pressure resistance and strength, so that the pipe has very high pressure resistance while the heat insulation performance of the foaming pipe is not lost, the problems of deformation of cells and heat insulation of the existing pipe under the conditions of long-time high temperature and high pressure are solved, and the PE modified foaming layer has wide application prospect in the deep geothermal field.
Description
Technical Field
The invention belongs to the technical field of deep geothermal pipelines, and particularly relates to a pressure-resistant foam plastic foaming heat-insulating pipe and a preparation method thereof.
Background
At present, in the deep geothermal field, hot water needs to be extracted from the pit with the diameter of 2500 meters, then heat exchange is carried out, a foaming pipe is a pipe with good heat preservation effect, derivative products of the pipe comprise a foaming composite pipe, a core layer foaming pipe and the like, but the common foaming pipes have poor pressure resistance, and can be subjected to great pressure in a high-temperature water medium environment with the diameter of 2500 meters, so that foam holes are extruded and deformed, even the foam holes are broken to enter water, and the heat preservation performance is lost. Patent CN1105743C mentions that adding rigid ions such as calcium carbonate and talcum powder to the foaming system improves the rigidity, but at high pressure of 25MPa, the foam cells are easily extruded, so that the foam cells are difficult to be used in the field of deep geothermal heat.
Disclosure of Invention
Aiming at the defects of the medium-deep geothermal pipeline, the invention aims to provide a high-pressure-resistance high-strength foaming heat-insulation pipe and a preparation method thereof, which can realize high pressure resistance without losing the heat-insulation performance of the foaming pipe, and can solve the problem of deformation of cells under the conditions of high pressure and high temperature for a long time and the problem of heat insulation.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the pressure-resistant foam plastic foaming heat-insulating pipe is formed by compounding an inner layer pipe and an outer layer pipe, wherein the inner layer pipe is PE or PP, the outer layer pipe is a PE modified foaming layer, and the PE modified foaming layer comprises the following components in parts by weight:
100 parts of matrix resin; 1-3 parts of foaming agent; 5-10 parts of reinforcing body; 1-3 parts of an antioxidant; 1-3 parts of dispersing agent and 2-3 parts of coupling agent;
the matrix resin is one of PE-RT or HDPE powder.
As a preferable technical scheme, when the inner layer pipe adopts PE, the PE is one of HDPE, PERT I type or PERT II type; when the inner layer pipe is selected from PP, the PP is one of PPR, PPB, PPH.
As a preferable technical scheme, the foaming agent is any one of azodicarbonamide, pentamethylene tetramine and citric acid/sodium bicarbonate.
As the preferable technical scheme, the reinforcement is one or two of potassium hexatitanate whisker and aluminum borate whisker; the antioxidant is phenolic antioxidant 1010 or 1076; the dispersing agent is one or two of zinc stearate and barium stearate.
As a preferable technical scheme, the coupling agent is any one or two of aluminate, tin coupling agent and silane coupling agent.
The invention also provides a preparation method of the pressure-resistant foam plastic foaming heat-preserving pipe, which comprises the following steps:
s1: after uniformly stirring PE modified foaming layer components, adding the PE modified foaming layer components into a granulator at a certain temperature for granulating, and pouring the materials into a charging barrel of a coating machine for standby;
s2: extruding the inner layer pipe through an extruder extrusion molding process;
s3: when the inner layer pipe passes through the cladding machine, cladding the outer layer pipe at a certain temperature;
s4: and (5) cooling, traction cutting and wire-off the pipe after the cladding of the outer layer pipe is finished.
Preferably, the granulating temperature in the step S1 is 140-160 ℃; in the step S2, the set temperature of the extruder is 180-190 ℃; in the step S3, the temperature of the cladding machine is set to be 180-190 ℃.
Compared with the prior art, the technical scheme of the invention has the advantages that by designing the two layers of composite pipelines, wherein the inner layer is PE or PP with good heat resistance, the outer layer is the PE modified foaming layer, and the PE modified foaming layer has very high pressure resistance and strength, and the potassium hexatitanate whisker and the aluminum borate whisker are added in the PE modified foaming layer, so that the heat insulation performance of the foaming pipe is not lost, the pipe has very high pressure resistance, the problems of deformation of cells and heat insulation of the existing pipe under the conditions of long-time high temperature and high pressure are solved, and the PE modified foaming layer has wide application prospect in the deep geothermal field.
Drawings
FIG. 1 is a schematic diagram of a pressure-resistant foam plastic foaming insulation pipe structure of the invention;
FIG. 2 is a flow chart of a process for preparing the pressure-resistant foam plastic foaming insulation pipe.
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.
As shown in fig. 1, the pressure-resistant foam plastic foaming heat-insulating pipe is formed by compounding an inner pipe 2 and an outer pipe 1, wherein the inner pipe 2 is PE or PP, the outer pipe 1 is a PE modified foaming layer, and the PE modified foaming layer comprises the following components in parts by weight:
100 parts of matrix resin; 1-3 parts of foaming agent; 5-10 parts of reinforcing body; 1-3 parts of an antioxidant; 1-3 parts of dispersing agent and 2-3 parts of coupling agent;
the matrix resin is one of PE-RT or HDPE powder;
fig. 2 is a process flow chart of a preparation process of the pressure-resistant foam plastic foaming insulation pipe, and the specific preparation embodiment is as follows:
in the embodiment, a single screw extruder is selected as the extruder;
example 1:
granulating: 100 parts of PERT II type resin, 2 parts of azodicarbonamide, 5 parts of potassium hexatitanate whisker, 1010 parts of phenolic antioxidant, 2 parts of zinc stearate and 2 parts of silane coupling agent are added into a stirrer to be uniformly stirred, and then added into a charging barrel of a granulator to be granulated, wherein the granulating temperature is set to be 150 ℃.
Extrusion: extruding PERT II type pipe by a single screw extruder, wherein the temperature of a barrel area is 180 ℃, the temperature of a die head area is 190-200 ℃, carrying out vacuum sizing, the vacuum degree is 0.1MPa, cooling, coating a PE modified foaming layer by coating equipment, setting the temperature of a coating machine to 190 ℃, cooling, cutting, and taking off.
Example 2:
granulating: 100 parts of PERT II type resin, 3 parts of pentamethylene tetramine, 6 parts of potassium hexatitanate whisker, 4 parts of aluminum borate whisker, 1010 parts of phenolic antioxidant, 3 parts of zinc stearate and 3 parts of aluminate are added into a stirrer to be uniformly stirred, and then added into a charging barrel of a granulator to be granulated, wherein the granulating temperature is set to 140 ℃.
Extrusion: extruding PERT II type pipe by a single screw extruder, wherein the temperature of a barrel area is 190 ℃, the temperature of a die head area is 190-200 ℃, carrying out vacuum sizing, the vacuum degree is 0.1MPa, cooling, coating a PE modified foaming layer by coating equipment, setting the temperature of a coating machine to 180 ℃, cooling, cutting, and taking off.
Example 3:
granulating: 100 parts of PERT II type resin, 2 parts of azodicarbonamide, 8 parts of aluminum borate whisker, 1076 parts of phenolic antioxidant, 1 part of barium stearate, 2 parts of tin coupling agent and 1 part of silane coupling agent are added into a stirrer to be uniformly stirred, and then added into a charging barrel of a granulator to be granulated, wherein the granulating temperature is set to 160 ℃.
Extrusion: extruding PERT II type pipe by a single screw extruder, wherein the temperature of a barrel area is 190 ℃, the temperature of a die head area is 190-200 ℃, carrying out vacuum sizing, the vacuum degree is 0.1MPa, cooling, coating a PE modified foaming layer by coating equipment, setting the temperature of a coating machine to 190 ℃, cooling, cutting, and taking off.
Comparative example 1:
granulating: 100 parts of PERT II type resin and 2 parts of azodicarbonamide are added into a stirrer to be stirred uniformly, and then added into a charging barrel of a granulator to be granulated, wherein the granulating temperature is set to be 150 ℃.
Extrusion: extruding PERT II type pipe by a single screw extruder, wherein the temperature of a barrel area is 185 ℃, the temperature of a die head area is 190-200 ℃, carrying out vacuum sizing, the vacuum degree is 0.1MPa, cooling, coating an un-PE modified foaming layer by coating equipment, setting the temperature of a coating machine to 190 ℃, cooling, cutting, and taking off.
Comparative example 2:
granulating: 100 parts of PERT II type resin, 1 part of azodicarbonamide, 1010 parts of phenolic antioxidant, 2 parts of zinc stearate, 2 parts of silane coupling agent and 1 part of aluminate are added into a stirrer to be uniformly stirred, and then are added into a charging barrel of a granulator to be granulated, wherein the granulating temperature is set to be 150 ℃.
Extrusion: extruding PERT II type pipe by a single screw extruder, wherein the temperature of a barrel area is 190 ℃, the temperature of a die head area is 190-200 ℃, carrying out vacuum sizing, the vacuum degree is 0.1MPa, cooling, coating an un-PE modified foaming layer by coating equipment, setting the temperature of a coating machine to 190 ℃, cooling, cutting, and taking off.
The performance test method comprises the following steps: cutting out a small section of the produced composite pipe, placing the composite pipe into a steel drum, applying pressure of 25MPa, placing for 5 days, taking out, and using a microscope to obtain the shape of the foam holes of the pipe. The strength and thermal conductivity of the samples were measured using conventional testing methods.
The wall thickness ratio of the inner layer to the outer layer of the tubular product specification dn110 SDR11 is 4:1;
through testing, the performance test conditions of each example and comparative example are shown in the following table:
| sample of | Cell morphology | Strength MPa | Thermal conductivity W/m.times.K |
| Comparative example 1 | Cell closure | 22 | 0.40 |
| Comparative example 2 | Cell closure | 25 | 0.38 |
| Example 1 | The cells become elliptical | 31 | 0.21 |
| Example 2 | The cells are still round | 34 | 0.23 |
| Example 3 | The cells become elliptical | 30 | 0.29 |
As can be seen from the table above, the strength of examples 1-3 is higher than that of comparative examples 1-2 due to the addition of whisker reinforcements, and the morphology of cells of comparative examples 1-2 is not greatly changed under the supporting action of the high-strength reinforcements, so that the heat conductivity is maintained at a lower level, and the heat insulation performance is greatly improved.
The design concept of the high-pressure-resistance high-strength foaming heat-preservation pipe is that a two-layer composite pipe is manufactured, the inner layer is PE or PP with good heat resistance, the PE can be one of HDPE, PERT I type or II type, the PP can be one of PPR, PPB, PPH, and the outer layer is a PE modified foaming layer with high pressure resistance and strength. The PE modified foaming layer is added with the potassium hexatitanate whisker and the aluminum borate whisker, has the characteristics of high infrared reflectivity, low heat conductivity, high elastic modulus, high wear resistance, high chemical stability and the like, and improves the mechanism of pressure resistance, namely, the foaming material can be decomposed into cells and a plastic matrix in microscopic analysis, and the potassium hexatitanate whisker and the aluminum borate whisker can strengthen the plastic matrix, so that the foaming material can also have a supporting effect under the action of very high external force.
According to the technical scheme, by designing the two-layer composite pipeline, the inner layer is PE or PP with good heat resistance, the outer layer is the PE modified foaming layer, and the PE modified foam pipe has high pressure resistance and strength, so that the pipe has high pressure resistance while the heat insulation performance of the foaming pipe is not lost, the problems of deformation of cells and heat insulation of the existing pipe under the condition of high temperature and high pressure for a long time are solved, and the PE modified foam pipe has wide application prospects in the deep geothermal field.
Claims (8)
1. The pressure-resistant foam plastic foaming heat-insulating pipe is characterized by being formed by compounding an inner layer pipe and an outer layer pipe, wherein the inner layer pipe is PE or PP, the outer layer pipe is a PE modified foaming layer, and the PE modified foaming layer comprises the following components in parts by weight:
100 parts of matrix resin; 1-3 parts of foaming agent; 5-10 parts of reinforcing body; 1-3 parts of an antioxidant; 1-3 parts of dispersing agent and 2-3 parts of coupling agent;
the matrix resin is one of PE-RT or HDPE powder;
the reinforcement is one or two of potassium hexatitanate whiskers and aluminum borate whiskers;
the dispersing agent is one or two of zinc stearate and barium stearate.
2. The pressure-resistant foam plastic foaming heat-insulating pipe applied to the deep geothermal field, according to claim 1, wherein the inner pipe PE is one of HDPE, PERT I type or PERT II type; the inner layer tube PP is one of PPR, PPB, PPH.
3. The pressure-resistant foam plastic foaming heat-insulating pipe applied to the deep geothermal field, according to claim 1, wherein the foaming agent is any one of azodicarbonamide, pentamethylene tetramine and citric acid/sodium bicarbonate.
4. The pressure-resistant foam plastic foaming thermal insulation pipe applied to the deep geothermal field, according to claim 1, wherein the antioxidant is phenolic antioxidant 1010 or 1076.
5. The pressure-resistant foam plastic foaming heat-insulating pipe applied to the deep geothermal field, according to claim 1, wherein the coupling agent is any one or two of aluminate, tin coupling agent and silane coupling agent.
6. The pressure-resistant foam plastic foaming thermal insulation pipe applied to the deep geothermal field according to claim 1, wherein the wall thickness ratio of the inner layer pipe to the outer layer pipe is 4:1.
7. the method for preparing the pressure-resistant foam plastic foaming heat-insulating pipe applied to the field of deep geothermal heat according to any one of claims 1 to 6, which is characterized by comprising the following steps:
s1: weighing the components of the PE modified foaming layer according to the proportion, uniformly stirring, adding the components into a granulator at a certain temperature for granulating, and pouring the materials into a charging barrel of a coating machine for standby after granulating;
s2: extruding the inner layer pipe through an extruder extrusion molding process;
s3: when the inner layer pipe passes through the cladding machine, cladding the outer layer pipe at a certain temperature;
s4: and (5) cooling, traction cutting and wire-off the pipe after the cladding of the outer layer pipe is finished.
8. The method for preparing the pressure-resistant foam plastic foaming heat-preserving pipe applied to the deep geothermal field, according to claim 7, wherein the granulating temperature in the step S1 is 140-160 ℃; in the step S2, the set temperature of the extruder is 180-190 ℃; in the step S3, the temperature of the cladding machine is set to be 180-190 ℃.
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