CN115451208A - PE-RT II type polyethylene pipeline, preparation method thereof and heat-resistant polyethylene thermal pipeline - Google Patents
PE-RT II type polyethylene pipeline, preparation method thereof and heat-resistant polyethylene thermal pipeline Download PDFInfo
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- CN115451208A CN115451208A CN202211138880.XA CN202211138880A CN115451208A CN 115451208 A CN115451208 A CN 115451208A CN 202211138880 A CN202211138880 A CN 202211138880A CN 115451208 A CN115451208 A CN 115451208A
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- 239000004698 Polyethylene Substances 0.000 title claims abstract description 83
- -1 polyethylene Polymers 0.000 title claims abstract description 77
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 24
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000005977 Ethylene Substances 0.000 claims abstract description 19
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 17
- 238000009826 distribution Methods 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000005187 foaming Methods 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 239000011651 chromium Substances 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 9
- 229920001903 high density polyethylene Polymers 0.000 claims description 9
- 239000004700 high-density polyethylene Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000004814 polyurethane Substances 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 238000002425 crystallisation Methods 0.000 claims description 7
- 230000008025 crystallization Effects 0.000 claims description 7
- 239000006261 foam material Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000011701 zinc Substances 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 239000003086 colorant Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000002902 bimodal effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012968 metallocene catalyst Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Images
Classifications
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- 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
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
- F16L9/19—Multi-channel pipes or pipe assemblies
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/04—Protection of pipes or objects of similar shape against external or internal damage or wear against fire or other external sources of extreme heat
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention relates to the technical field of thermal pipelines, in particular to a PE-RT II type polyethylene pipeline and a preparation method thereof, and a heat-resistant polyethylene thermal pipeline, wherein the PE-RT II type polyethylene pipeline comprises 35-65 parts of ethylene, 30-60 parts of hexene and 2 parts of catalyst by weight, wherein the ratio of ethylene to hexene is (0.8 to 2): 1. the invention aims to provide a PE-RT II type polyethylene pipeline, a preparation method thereof and a heat-resistant polyethylene thermal pipeline, wherein ethylene and hexene are used as comonomers to generate high-density II type heat-resistant polyethylene, and the high-density II type heat-resistant polyethylene pipeline is designed by a structure with bimodal molecular weight distribution, has excellent heat resistance, and simultaneously retains the excellent low-temperature impact resistance and stress cracking resistance of polyethylene family materials.
Description
Technical Field
The invention relates to the technical field of thermal pipelines, in particular to a PE-RT II type polyethylene pipeline and a preparation method thereof, and a heat-resistant polyethylene thermal pipeline.
Background
The conventional PE-RT type heat pipe is a special linear medium-density ethylene copolymer prepared by copolymerizing ethylene and octene, a proper amount of auxiliary agent is added, and the thermoplastic heating pipe formed by extrusion has good flexibility, small bending radius which is 5 times of the outer diameter of the pipe, does not rebound after being bent due to special stress relaxation and is convenient for laying operation. The material has good impact resistance and thermal stability, can be connected by hot melting, is convenient to install and maintain, and has excellent forming and processing properties.
The conventional PE-RT type heat pipe is a medium density polyethylene pipe, has excellent low temperature impact resistance and stress cracking resistance, but is not excellent enough in heat resistance, is easily deformed when hot water having a temperature close to 100 ℃ is transported for a long time, and has a risk of emitting its component substances.
Disclosure of Invention
The invention aims to provide a PE-RT II type polyethylene pipeline, a preparation method thereof and a heat-resistant polyethylene thermal pipeline, wherein ethylene and hexene are used as comonomers to generate high-density II type heat-resistant polyethylene, and the high-density II type heat-resistant polyethylene pipeline is designed by a structure with bimodal molecular weight distribution, has excellent heat resistance, and simultaneously retains the excellent low-temperature impact resistance and stress cracking resistance of polyethylene family materials.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a PE-RT II type polyethylene pipeline which comprises, by weight, 35-65 parts of ethylene, 30-60 parts of hexene and 2 parts of a catalyst, wherein the ratio of ethylene to hexene is (0.8 to 2): 1.
in the above PE-RT ii polyethylene pipe, the catalyst is preferably in powder form, and comprises chromium, zinc or metallocene, or a mixture of chromium and zinc in any proportion, or a mixture of chromium and metallocene in any proportion.
The invention also provides a preparation method of the PE-RT II type polyethylene pipeline, the PE-RT II type polyethylene pipeline is made of heat-resistant polyethylene PE-RT materials, and the preparation method comprises the following steps:
step 3, vacuum sizing; shaping the extruded pipe by using a vacuum cooling shaping machine, wherein the water temperature of a vacuum box is 30-35 ℃;
step 4, cooling and forming; and cooling the pipe obtained in the step, wherein the cooling water temperature is 30 +/-5 ℃, and the offline temperature of the pipe after leaving the cooling water is not more than 30 ℃.
In the above method for preparing PE-RT II type polyethylene pipe, preferably, in step 1, the pre-crystallization time is not less than 1.5h.
In the preparation method of the PE-RT II type polyethylene pipeline, as a preferable scheme, the method is characterized in that in the step 2, the temperature of a screw mixing section is 220 +/-5 ℃, the screw tooth depth of the mixing section is 0.25D, and D is the screw diameter.
In the above method for preparing the PE-RT II type polyethylene pipe, as a preferable scheme, the method is characterized in that in the step 2, the depth of the chromium plating layer of the mould is not less than 0.06mm, and the surface roughness is not higher than Ra0.4 μm.
The invention also provides a PE-RT II type heat-resistant polyethylene heat distribution pipeline, which is characterized by comprising the following components:
the inner layer pressure-bearing pipeline is the PE-RT II type polyethylene pipeline or the PE-RT II type polyethylene pipeline prepared by the preparation method;
the middle layer foaming heat insulation layer is a PE + EVA closed cell foaming material and/or a polyurethane PU foaming material;
the outer protective sheath is a High Density Polyethylene (HDPE) single-wall corrugated pipe, or an HDPE skinning layer, or a PVC-U sheath.
In the PE-RT II type heat-resistant polyethylene heat distribution pipeline, as a preferred scheme, two or three parallel inner layer pressure-bearing pipelines are arranged inside the heat distribution pipeline, and PE + EVA closed-cell foam materials and/or polyurethane PU foam materials are filled between the inner layer pressure-bearing pipelines and the outer layer protective sleeve.
In the PE-RT II type heat-resistant polyethylene thermal pipeline, as a preferable scheme, the heat conductivity coefficient of the middle foaming heat-insulating layer is not lower than 0.032W/m.K.
In the PE-RT II type heat-resistant polyethylene heat distribution pipeline, as a preferable scheme, the heat conductivity coefficient of the outer protective sleeve is not lower than 0.42W/m.K.
Compared with the prior art, the invention has the following technical effects:
the invention provides a PE-RT II type polyethylene pipeline, which takes ethylene and hexene as comonomers to generate high-density II type heat-resistant polyethylene, is designed by a structure with bimodal molecular weight distribution, has excellent heat resistance, and simultaneously retains the excellent low-temperature impact resistance and stress cracking resistance of polyethylene family materials.
The invention also provides a preparation method of the polyethylene pipeline and a PE-RT II type heat-resistant polyethylene heat distribution pipeline, and the beneficial effects and the PE-RT II type heat-resistant polyethylene heat distribution pipeline are not repeated.
Drawings
FIG. 1 is a schematic diagram of the general structure of a PE-RT II type heat-resistant polyethylene heat pipe provided by an embodiment of the present invention;
FIG. 2 is a second schematic diagram of the general structure of a PE-RT II type heat-resistant polyethylene heat pipe according to an embodiment of the present invention;
FIG. 3 is a third schematic diagram of the general structure of a PE-RT II type heat-resistant polyethylene heat distribution pipeline provided by an embodiment of the present invention.
Description of reference numerals:
1. an outer protective jacket; 2. a middle layer foaming heat-insulating layer; 31. a first inner layer pressure-bearing conduit; 32. a second inner layer pressure-bearing pipe; 33. and a third inner layer pressure-bearing pipeline.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but rather as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including but not limited to.
The meaning of the words related to TCM and TCM presented in the present invention is well known to those skilled in the art without specific explanation, such as stuffy and moist, etc.
The "parts" in the present invention are all parts by mass unless otherwise specified.
The parts by weight of the invention mainly comprise the disclosed numerical range, any numerical value (including integers and decimal points) or any two numerical intervals in the disclosed range, or discontinuous multiple intervals, and also comprise numerical values or numerical ranges which are close to the end value of the numerical range and can be expected to have similar effects, for example, 5-10 parts, not only 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts and any two intervals, but also other numerical ranges, not examples, are all included in the invention. Thus, the invention also includes any sub-range of the numerical range that has been disclosed directly or any specific value therein.
The invention provides a PE-RT II type polyethylene pipeline, which comprises 35-65 parts (such as 35 parts, 36 parts, 40 parts, 46 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 64 parts, 65 parts and the like, which can be decimal) of ethylene, 30-60 parts (such as 30 parts, 32 parts, 35 parts, 36 parts, 40 parts, 46 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts and the like, which can be decimal) of hexene, 2 parts (such as 1 part, 2 parts, which can be decimal) of catalyst, wherein the proportion of ethylene to hexene is (0.8-2): 1.
in the above PE-RT ii polyethylene pipe, the catalyst is preferably in powder form, and comprises chromium, zinc or metallocene, or a mixture of chromium and zinc in any proportion, or a mixture of chromium and metallocene in any proportion.
The invention also provides a preparation method of the PE-RT II type polyethylene pipeline, the PE-RT II type polyethylene pipeline is made of heat-resistant polyethylene PE-RT materials, and the preparation method comprises the following steps:
step 3, vacuum sizing; shaping the extruded pipe by using a vacuum cooling shaping machine, wherein the water temperature of a vacuum box is 30-35 ℃;
step 4, cooling and forming; and cooling the pipe obtained in the step, wherein the cooling water temperature is 30 +/-5 ℃, and the offline temperature of the pipe after leaving the cooling water is not more than 30 ℃.
In the above method for preparing PE-RT II type polyethylene pipe, preferably, in step 1, the pre-crystallization time is not less than 1.5h.
In the preparation method of the PE-RT II type polyethylene pipeline, as a preferable scheme, the method is characterized in that in the step 2, the temperature of a screw mixing section is 220 +/-5 ℃, the screw tooth depth of the mixing section is 0.25D, and D is the screw diameter.
In the above method for preparing the PE-RT II type polyethylene pipe, as a preferable scheme, the method is characterized in that in the step 2, the depth of the chromium plating layer of the mould is not less than 0.06mm, and the surface roughness is not higher than Ra0.4 μm.
The invention also provides a PE-RT II type heat-resistant polyethylene heat distribution pipeline, which is characterized by comprising the following components:
the inner layer pressure-bearing pipeline is the PE-RT II type polyethylene pipeline or the PE-RT II type polyethylene pipeline prepared by the preparation method;
the middle layer foaming heat insulation layer 2 is a PE + EVA closed cell foaming material and/or a polyurethane PU foaming material;
the outer protective sheath 1, outer protective sheath 1 is High Density Polyethylene (HDPE) single wall bellows, or HDPE skinning layer, or PVC-U sheath.
In the PE-RT II type heat-resistant polyethylene heat distribution pipeline, as a preferred scheme, two or three parallel inner layer pressure-bearing pipelines are arranged inside the heat distribution pipeline, and PE + EVA closed-cell foam materials and/or polyurethane PU foam materials are filled between the inner layer pressure-bearing pipelines and the outer layer protective sleeve 1.
In the PE-RT II type heat-resistant polyethylene thermal pipeline, as a preferable scheme, the heat conductivity coefficient of the middle foaming heat-insulating layer 2 is not lower than 0.032W/m.K.
In the PE-RT II type heat-resistant polyethylene heat distribution pipeline, the heat conductivity coefficient of the outer protective sleeve 1 is preferably not lower than 0.42W/m.K.
As shown in fig. 1, in the above embodiment, the inner pressure-containing pipe is the first inner pressure-containing pipe 31.
As shown in fig. 2, as a preferred embodiment, two parallel inner pressure-bearing pipelines, namely a first inner pressure-bearing pipeline 31 and a second inner pressure-bearing pipeline 32, are arranged inside the heat distribution pipeline.
As shown in fig. 3, as a preferred embodiment, two parallel inner layer pressure-bearing pipelines are arranged inside the heat distribution pipeline, which are respectively a first inner layer pressure-bearing pipeline 31, a second inner layer pressure-bearing pipeline 32 and a third inner layer pressure-bearing pipeline 33.
Example 1
The invention provides a PE-RT II type polyethylene pipeline which comprises, by weight, 35 parts of ethylene, 40 parts of hexene and 2 parts of a catalyst, wherein the catalyst is a mixture of 0.5 part of chromium powder, 0.8 part of zinc powder and 0.7 part of metallocene catalyst.
The PE-RT II type polyethylene pipe of the embodiment is prepared by the following method:
step 3, vacuum sizing; and (3) shaping the extruded pipe by using a vacuum cooling shaping machine, wherein the water temperature of a vacuum box is 30-35 ℃.
Step 4, cooling and forming; and cooling the pipe obtained in the step, wherein the cooling water temperature is 30 +/-5 ℃, and the offline temperature of the pipe after leaving the cooling water is not more than 30 ℃.
Example 2
The invention provides a PE-RT II type polyethylene pipeline which comprises, by weight, 60 parts of ethylene, 30 parts of hexene and 2 parts of a catalyst, wherein the catalyst is a powdery mixture of 1 part of chromium powder and 1 part of zinc powder.
The PE-RT II polyethylene pipe of this example was prepared in the same manner as in example 1.
Example 3
The invention provides a PE-RT II type polyethylene pipeline which comprises, by weight, 50 parts of ethylene, 50 parts of hexene and 1 part of catalyst, wherein the catalyst is a mixture of 0.5 part of chromium powder and 0.5 part of metallocene catalyst.
The PE-RT II type polyethylene pipe of this example was prepared in the same manner as in example 1.
The PE-RT II type polyethylene pipeline has the following properties:
| performance of | Test standard | Unit | Standard value | Measured value |
| Density of | GB/T1033.1-2008 | Kg/m³ | 945～955 | 947 |
| Melt flow rate | GB/T3682.1-2018 | g/10min | 0.3～0.8 | 0.7 |
| Time of oxidative induction | GB/T19466.6 | Min | ≥40 | ≥40 |
| Tensile yield stress | GB/T1040.2 | MPa | ≥18.0 | 25±2 |
| Ash content | GB/T9345.1 | % | ≤0.1 | 0.06 |
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The PE-RT II type polyethylene pipeline is characterized by comprising, by weight, 35-65 parts of ethylene, 30-60 parts of hexene and 2 parts of a catalyst, wherein the ratio of ethylene to hexene is (0.8 to 2): 1.
2. the PE-RT II polyethylene pipe according to claim 1, wherein the catalyst is in powder form and comprises chromium, zinc or metallocene as a single component, or a mixture of the two in any ratio, or a mixture of the three in any ratio.
3. A preparation method of a PE-RT II type polyethylene pipeline is characterized in that the PE-RT II type polyethylene pipeline is made of heat-resistant polyethylene PE-RT materials, and comprises the following steps: step 1, mixing colors and drying; heating and mixing hexene, ethylene and a catalyst in a certain ratio, and then performing pre-crystallization at 95 ℃ to obtain a PE-RT material; step 2, screw extrusion; and (2) putting the PE-RT material obtained in the step into a screw extruder for extrusion, wherein the screw temperature is 210-225 ℃, and the screw parameters are 1:33, the temperature of the die is 215-225 ℃; step 3, vacuum sizing; shaping the extruded pipe by using a vacuum cooling shaping machine, wherein the water temperature of a vacuum box is 30-35 ℃; step 4, cooling and forming; and cooling the pipe obtained in the step, wherein the cooling water temperature is 30 +/-5 ℃, and the offline temperature of the pipe after leaving the cooling water is not more than 30 ℃.
4. The process for preparing PE-RT II polyethylene pipes according to claim 1, wherein in step 1, the pre-crystallization time is not less than 1.5h.
5. The method for preparing PE-RT II polyethylene pipe according to claim 1, wherein in step 2, the temperature of the screw mixing section is 220 ± 5 ℃, the screw depth of the mixing section is 0.25D, and D is the screw diameter.
6. The process for preparing PE-RT II polyethylene pipes according to claim 3, wherein in step 2, the depth of the chrome-plated layer of the mould is not less than 0.06mm, and the surface roughness is not higher than Ra0.4 μm.
7. A PE-RT II type heat-resistant polyethylene heat distribution pipeline is characterized by comprising: an inner pressure-bearing pipeline which is the PE-RT II type polyethylene pipeline as defined in any one of claims 1 to 2 or the PE-RT II type polyethylene pipeline prepared by the preparation method as defined in any one of claims 3 to 6; the middle layer foaming heat insulation layer is a PE + EVA closed cell foaming material and/or a polyurethane PU foaming material; the outer protective sheath is a High Density Polyethylene (HDPE) single-wall corrugated pipe, or an HDPE skinning layer, or a PVC-U sheath.
8. The PE-RT II heat-resistant polyethylene heat pipe according to claim 7, wherein two or three parallel inner pressure-bearing pipes are arranged inside the heat pipe, and PE + EVA closed-cell foam material and/or polyurethane PU foam material are filled between the inner pressure-bearing pipes and the outer protective jacket.
9. The PE-RT II heat-resistant polyethylene heat pipe as claimed in claim 7, wherein the intermediate foamed insulation layer has a thermal conductivity of not less than 0.032W/m.K.
10. A PE-RT II type heat resistant polyethylene thermal pipe according to claim 7, characterized in that the thermal conductivity of the outer protective sheath is not less than 0.42W/m-K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211138880.XA CN115451208A (en) | 2022-09-19 | 2022-09-19 | PE-RT II type polyethylene pipeline, preparation method thereof and heat-resistant polyethylene thermal pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211138880.XA CN115451208A (en) | 2022-09-19 | 2022-09-19 | PE-RT II type polyethylene pipeline, preparation method thereof and heat-resistant polyethylene thermal pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116838862A (en) * | 2023-06-20 | 2023-10-03 | 陕西伟星新型建材有限公司 | A high-rigidity and high-weather-resistant prefabricated thermal insulation composite plastic pipe and its preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116838862A (en) * | 2023-06-20 | 2023-10-03 | 陕西伟星新型建材有限公司 | A high-rigidity and high-weather-resistant prefabricated thermal insulation composite plastic pipe and its preparation method |
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