CN106366276A - High-density rigid polyurethane foam material prefabricated heat insulating pipeline and prefabricating method - Google Patents
High-density rigid polyurethane foam material prefabricated heat insulating pipeline and prefabricating method Download PDFInfo
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- CN106366276A CN106366276A CN201610728795.7A CN201610728795A CN106366276A CN 106366276 A CN106366276 A CN 106366276A CN 201610728795 A CN201610728795 A CN 201610728795A CN 106366276 A CN106366276 A CN 106366276A
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- polyurethane
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- heat insulating
- high density
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
- C08G18/4808—Mixtures of two or more polyetherdiols
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/18—Filling preformed cavities
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/16—Catalysts
- C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
- C08G18/1816—Catalysts containing secondary or tertiary amines or salts thereof having carbocyclic groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/16—Catalysts
- C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
- C08G18/20—Heterocyclic amines; Salts thereof
- C08G18/2009—Heterocyclic amines; Salts thereof containing one heterocyclic ring
- C08G18/2036—Heterocyclic amines; Salts thereof containing one heterocyclic ring having at least three nitrogen atoms in the ring
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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
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
-
- 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
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0025—Foam properties rigid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0041—Foam properties having specified density
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0083—Foam properties prepared using water as the sole blowing agent
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
A high-density rigid polyurethane foam material prefabricated heat insulating pipeline and a prefabricating method. The heat insulating pipeline is composed of an inner layer working steel pipe, a middle high-density polyurethane heat insulating layer, and an outer layer protective pipeline. The high-density polyurethane heat insulating layer is formed by uniformly mixing combined polyether, a foam stabilizer, a catalyst, a foamer and polyisocyanate and pouring the mixture. During prefabrication, the weighed polyether polyol, foam stabilizer, catalyst and foamer are added into a mixing kettle and are stirred for 30-60 min until uniformly mixed. The temperature of a blank material and the polyisocyanate is regulated to 20-25 DEG C. The blank material and the polyisocyanate are uniformly mixed according to the mass ratio of 1:1-1.3 by means of a high-pressure foaming machine, and the mixture is poured into a pipeline prefabricating cavity die so that the polyurethane stock liquid is foamed in the sealed space under a free pressure to form the high-density polyurethane heat insulating layer. In the method, water serves as the foamer, so that the method is zero in ozone depletion potential. The polyurethane heat insulating layer has high density and high compressive strength, and satisfies the function of supporting the working steel pipe.
Description
Technical field
The invention belongs to a kind of heat preservation technology, especially a kind of prefabricated pipe of utilization High density Rigid PU foams material preparation
Road, specifically a kind of utilidor prefabricated for High density Rigid PU foams foaming materials agent with water and preparation method thereof.
Technical background
With the acceleration of China's economic development and urbanization process, the heat supply network development as urban infrastructure is fast
Speed, closely during the last ten years, heat preservation pipe prefabricated quickly grows in China, it has also become the first-selection of heating network.Insulation material was adopted from early stage
Develop into polyurethane foam heat-insulation pipe with prefabricated mineral wool or hydrophobic pearlite, polyurethane has heat conduction as a kind of insulation material
Coefficient is little, relative mass is light, good stability of the dimension, waterproof, shockproof, solvent resistant, ageing-resistant, easily processed into type etc. many excellent
Point.But, there is also some problems, due to internal work steel pipe very heavy it is desirable to polyurethane insulation coating has certain pressure-bearing energy
Power, the urethane raw of domestic a lot of producers does not reach highdensity requirement after expanding, and mechanical property can not meet requirement, and
And the resistance to elevated temperatures of polyurethane material is also not ideal.In polyurethane foam field, foaming agent cfc-11 has very to ozone layer
Big destruction has been substituted, and succedaneum hcfc-141b also has certain destruction to ozone layer, public with Montreal
Enforcement about, the material of ozone layer depletion is gradually eliminated, and the developed regions such as Europe, the U.S., Japan and country have stopped making
With hcfc-141b, China is also faced with the progressively replacement work of hcfc-141b as the participating country in Montreal.
Content of the invention
The present invention not only needs the foaming using welding in a large number when being directed to the heat-insulation layer preparation of prior art utilidor
Agent and cause prefabricated utilidor bearing capacity not enough and resistance to elevated temperatures difference problem, invent a kind of poly- ammonia of high density
The prefabricated utilidor of ester rigid foam material, provide a kind of corresponding pipe prefabrication method simultaneously, using being provided of the present invention
Rigid foam material formula and preparation method can prepare density in 60kg/m3More than, diametrically deformation 10% compressive strength not
Less than 400kpa, heat conductivity is less than 0.03w/ (m k), is resistant to 150 DEG C of temperature, in 120 DEG C of Long Service Lifes up to 30 years
High density polyurethane heat-insulation layer, in addition, the present invention makes to use water as foaming agent, nontoxic, the destruction (odp) to ozone layer is
Zero.
One of technical scheme is:
A kind of prefabricated utilidor of High density Rigid PU foams, is characterized in that it by inner operative steel pipe, middle high density
The outer protection tube road composition of polyurethane insulation coating and outer layer；Described high density polyurethane heat-insulation layer by combined polyether, foam stabilizer, urge
Agent, foaming agent are poured into after being mixed homogeneously with polyisocyanates in the closed cavity being formed by service pipe and outer protection tube road
Foamable reaction is obtained.
Described inner operative steel pipe is one of seamless steel pipe, spiral steel pipe or steel pipes with straight；Described outer layer
Outer protection tube road is high density polyethylene (HDPE) or glass reinforced plastic pipe.
Each component (by weight) of described high density polyurethane heat-insulation layer is:
100 parts of combined polyether glycol；
2～3 parts of foam stabilizer；
1～3 part of catalyst；
1～3 part of foaming agent；
100～130 parts of polyisocyanates.
Described combined polyether glycol is one of polyoxypropylene polyol or polytetrahydrofuran polyol or two
The combination planted, preferably one or more of dc380, dc635c, n210, tmn-450, gb4110a and nj4502.
Described foam stabilizer is the group of one or more of Siloxane-Oxyalkylene Copolymers, polysiloxanes or polyether silicone
Close, preferably one or more of ak-8805, b8525, b8528, b8462, l-6863, sd624 and sd622.
Described catalyst is one or more of dimethyl cyclohexyl amine class, dimethyl benzene amine or triazines catalyst
Combination, preferably one or more of pc-8, dabco, bdma, pc-41.
Described foaming agent is h2o.
Described polyisocyanates is polymethylene multi-phenenyl isocyanate (mdi) or thick mdi.
One of technical scheme is:
A kind of method for prefabricating of High density Rigid PU foams material utilidor is it is characterised in that it comprises the following steps:
A) prefabricated pipeline cavity mould: service pipe is nested in outer protection tube road and fixing, in service pipe and outer protection tube road
Two-port flange closure, adjustment termination, flange, control, by design requirement, length of letting the hair grow；
B) prepare white material: load weighted combined polyether glycol, foam stabilizer, catalyst, foaming agent are put in mixing kettle, stirring
30～60min is to mix homogeneously；
C) preparation of High density Rigid PU foams: according to the volume of the cavity mould between prefabricated pipeline working steel tube and outer protection tube
With the quality of the polyurethane stock solution crossing packed density calculating needs filling, adjustment is white to expect that the material temperature with polyisocyanates is 20～25
DEG C, white material and polyisocyanates are filled into prefabricated pipeline cavity mould by 1:1～1.3 material than after mixing homogeneously through high pressure foaming machine
Interior, make polyurethane stock solution carry out free pressure foaming in the space of closing, form high density polyurethane heat-insulation layer.
Described mistake packed density is the 110%～140% of the polyurethane insulation coating density of design.
The invention has the beneficial effects as follows:
(1) present invention adopts and uses water as foaming agent, different from the physical blowing agent of fluorochlorohydrocarbon, cyclopentanes, and water is that a kind of chemistry is sent out
Infusion, in the foamable reaction stage, water and isocyanates react generation urea, discharge co simultaneously2, the co of release2Remain in abscess
Play foaming effect.co2Odorless, nontoxic, the destruction (odp) to ozone layer is zero, and the multi-stress (tewi value) of global warming is
Zero, and use water as the foaming system process is simple of foaming agent, not high to equipment requirements, comply fully with replacement foaming agent hcfc-
The environmental requirement of 141b.
(2) using the prefabricated pipeline mould foam process of sealing, packed density is more than the polyurethane insulation coating density of design,
The polyurethane insulation coating density being formed after foaming ripening is larger, and compressive strength is good, meets the bearing capacity to working steel tube.
(3) pass through to adjust polyether polyol species and content, add silicone oil and the catalyst of excellent performance, adjust polyurethane
The mobility of stock solution, makes the ratio that foaming stock solution is filled in mould more uniform completely, and the polyurethane insulation coating being formed is existing
Preferably dimensional stability, also has preferable pliability, and the heat conductivity of polyurethane insulation coating is low, high insulating effect,
Resistance to elevated temperatures is good, long service life.
The rigid foam material formula being provided of the present invention and preparation method can prepare density in 60kg/m3More than, footpath
It is not less than 400kpa to the compressive strength of relative deformation 10%, heat conductivity is less than 0.03w/ (m k), is resistant to 150 DEG C of temperature,
120 DEG C of Long Service Lifes high density polyurethane heat-insulation layer up to 30 years is in addition, the present invention makes to use water as foaming agent, nontoxic
Harmless, the destruction (odp) to ozone layer is zero.
Brief description
Fig. 1 is the heat preservation pipe prefabricated first structure cross-sectional schematic of the present invention.
In figure: 1, inner operative steel pipe；2nd, middle high density polyurethane heat-insulation layer；3rd, the outer protection tube road of outer layer.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
Embodiment 1:
A kind of prefabricated thermal insulation pipeline, it is prepared from by following steps:
A) preparation of prefabricated pipeline cavity mould: service pipe is nested in outer protection tube road and fixing, in service pipe with outward
Pillar road two-port flange closure, adjustment termination, flange, control, by design requirement, length of letting the hair grow.
B) prepare white material: weigh 60kg combined polyether glycol dc380,30kg polyether polyol dc635c, 10kg respectively
Polyether polyol n210(adds up to 100kg combined polyether glycol, is equivalent to 100 weight portions), 2kg silicone oil sd624(Suzhou think moral
New material Science and Technology Ltd.), 0.4kg dimethyl cyclohexyl amine class catalyst pc-8(air Chemical Co., Ltd.), 1.6kg diformazan
Base aniline type catalysts dabco(air Chemical Co., Ltd.) (total 2kg catalyst is equivalent to 2 parts of catalyst), 2kgh2o
(being equivalent to 2 parts of foaming agent) puts in mixing kettle, and 40min is to mix homogeneously for stirring.
C) preparation of High density Rigid PU foams: the cavity mould between calculating prefabricated pipeline working steel tube and outer protection tube
Volume, by 75kg/m3Mistake packed density calculate quality, the white material of adjustment and the polyisocyanates of the polyurethane stock solution needing filling
(mdi) material temperature is 25 DEG C, and it is empty that white material is filled into prefabricated pipeline after mixing homogeneously through high pressure foaming machine by 1:1.05 material ratio with mdi
In cavity mould, make polyurethane stock solution carry out free pressure foaming in the space of closing, form high density polyurethane heat-insulation layer.
100 parts of combined polyether glycol；
2～3 parts of foam stabilizer；
1～3 part of catalyst；
1～3 part of foaming agent；
100～130 parts of polyisocyanates.
Embodiment 2:
A kind of prefabricated thermal insulation pipeline, it is prepared from by following steps:
A) preparation of prefabricated pipeline cavity mould: service pipe is nested in outer protection tube road and fixing, in service pipe with outward
Pillar road two-port flange closure, adjustment termination, flange, control, by design requirement, length of letting the hair grow.
B) prepare white material: weigh 50kg combined polyether glycol dc380,40kg polyether polyol dc635c, 10kg respectively
Polyether polyol n210,2.3kg silicone oil ak8805,0.3kg dimethyl cyclohexyl amine class catalyst pc-8,1.5kg dimethylaniline
Class catalyst bdma(great river Chemical Co., Ltd.), 1.2kg triazines catalyst pc-41(air Chemical Co., Ltd.),
3kgh2O puts in mixing kettle, and 50min is to mix homogeneously for stirring.
C) preparation of High density Rigid PU foams: the cavity mould between calculating prefabricated pipeline working steel tube and outer protection tube
Volume, by 80kg/m3Mistake packed density calculate the quality of the polyurethane stock solution needing filling, the material temperature of the white material of adjustment and mdi
For 25 DEG C, white material is filled in prefabricated pipeline cavity mould after being mixed homogeneously through high pressure foaming machine by 1:1.15 material ratio with mdi, makes
Polyurethane stock solution carries out free pressure foaming in the space of closing, forms high density polyurethane heat-insulation layer.
Embodiment 3:
A kind of prefabricated thermal insulation pipeline, it is prepared from by following steps:
A) preparation of prefabricated pipeline cavity mould: service pipe is nested in outer protection tube road and fixing, in service pipe with outward
Pillar road two-port flange closure, adjustment termination, flange, control, by design requirement, length of letting the hair grow.
B) prepare white material: weigh 55kg combined polyether glycol nj4502,40kg polyether polyol gb4110a, 5kg respectively
Polyether polyol n210,3kg silicone oil b8525(Gauss Mitt USA Corporation), 0.6kg dimethyl cyclohexyl amine class catalyst pc-8(air
Chemical Co., Ltd.), 0.4kg dimethyl benzene amine catalyst dabco, 1kgh2O puts in mixing kettle, and stirring 60min is to mixing
Uniformly.
C) preparation of High density Rigid PU foams: the cavity mould between calculating prefabricated pipeline working steel tube and outer protection tube
Volume, by 85kg/m3Mistake packed density calculate the quality of the polyurethane stock solution needing filling, the material temperature of the white material of adjustment and mdi
For 25 DEG C, white material is filled in prefabricated pipeline cavity mould after being mixed homogeneously through high pressure foaming machine by 1:1.3 material ratio with mdi, makes
Polyurethane stock solution carries out free pressure foaming in the space of closing, forms high density polyurethane heat-insulation layer.
Product performance index:
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.
Claims (10)
1. the prefabricated utilidor of a kind of High density Rigid PU foams, is characterized in that it by inner operative steel pipe, middle highly dense
The outer protection tube road composition of degree polyurethane insulation coating and outer layer；Described high density polyurethane heat-insulation layer by combined polyether, foam stabilizer,
Catalyst, foaming agent are poured into the closed cavity being formed by service pipe and outer protection tube road with polyisocyanates after mixing homogeneously
Interior foamable reaction is obtained.
2. prefabricated thermal insulation pipeline according to claim 1 it is characterised in that: described inner operative steel pipe be seamless steel
One of pipe, spiral steel pipe or steel pipes with straight；The outer protection tube road of described outer layer is high density polyethylene (HDPE) or glass reinforced plastic pipe.
3. prefabricated thermal insulation pipeline according to claim 1 it is characterised in that: described high density polyurethane heat-insulation layer each
Component (by weight) is:
100 parts of combined polyether glycol；
2～3 parts of foam stabilizer；
1～3 part of catalyst；
1～3 part of foaming agent；
100～130 parts of polyisocyanates.
4. prefabricated thermal insulation pipeline according to claim 3 it is characterised in that: described combined polyether glycol be polyoxygenated
The combination of one of propylene polyhydric alcohol or polytetrahydrofuran polyol or two kinds, preferably dc380, dc635c, n210, tmn-
450th, one or more of gb4110a and nj4502.
5. prefabricated thermal insulation pipeline according to claim 3 it is characterised in that: described foam stabilizer be polyether-modified poly- silica
The combination of one or more of alkane, polysiloxanes or polyether silicone, preferably ak-8805, b8525, b8528, b8462, l-
6863rd, one or more of sd624 and sd622.
6. prefabricated thermal insulation pipeline according to claim 3 it is characterised in that: described catalyst be dimethyl cyclohexyl amine
The combination of one or more of class, dimethyl benzene amine or triazines catalyst, preferably in pc-8, dabco, bdma, pc-41
One or more.
7. prefabricated thermal insulation pipeline according to claim 3 it is characterised in that: described foaming agent be h2o.
8. prefabricated thermal insulation pipeline according to claim 3 it is characterised in that: described polyisocyanates be the many benzene of polymethylene
Based isocyanate (mdi) or thick mdi.
9. High density Rigid PU foams material utilidor according to claim 1 method for prefabricating it is characterised in that it
Comprise the following steps:
A) prefabricated pipeline cavity mould: service pipe is nested in outer protection tube road and fixing, in service pipe and outer protection tube road
Two-port flange closure, adjustment termination, flange, control, by design requirement, length of letting the hair grow；
B) prepare white material: load weighted combined polyether glycol, foam stabilizer, catalyst, foaming agent are put in mixing kettle, stirring
30～60min is to mix homogeneously；
C) preparation of High density Rigid PU foams: according to the volume of the cavity mould between prefabricated pipeline working steel tube and outer protection tube
With the quality of the polyurethane stock solution crossing packed density calculating needs filling, adjustment is white to expect that the material temperature with polyisocyanates is 20～25
DEG C, white material and polyisocyanates are filled into prefabricated pipeline cavity mould by 1:1～1.3 material than after mixing homogeneously through high pressure foaming machine
Interior, make polyurethane stock solution carry out free pressure foaming in the space of closing, form high density polyurethane heat-insulation layer.
10. the method according to right 9 it is characterised in that: described mistake packed density be design polyurethane insulation coating close
The 110%～140% of degree.
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| CN201610728795.7A CN106366276A (en) | 2016-08-26 | 2016-08-26 | High-density rigid polyurethane foam material prefabricated heat insulating pipeline and prefabricating method |
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| CN201610728795.7A CN106366276A (en) | 2016-08-26 | 2016-08-26 | High-density rigid polyurethane foam material prefabricated heat insulating pipeline and prefabricating method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108215045A (en) * | 2017-11-29 | 2018-06-29 | 芜湖君如保温材料有限公司 | A kind of New hot oil line foam process and device |
| CN108359075A (en) * | 2018-01-08 | 2018-08-03 | 北京豪特耐管道设备有限公司 | A kind of heat preservation group material and its preparation method and application |
| CN109323083A (en) * | 2018-10-30 | 2019-02-12 | 中投（天津）热力股份有限公司 | A kind of efficient, durable heat-insulation pipe manufacturing process |
| CN109337351A (en) * | 2018-09-28 | 2019-02-15 | 安徽环科泵阀有限公司 | A kind of pump valve pipeline and preparation method thereof with heat insulation function |
| CN109571845A (en) * | 2018-10-30 | 2019-04-05 | 中投（天津）热力股份有限公司 | A kind of resistance to compression, ageing-resistant insulating tube manufacturing process |
| CN110701489A (en) * | 2019-09-27 | 2020-01-17 | 南京新核复合材料有限公司 | On-line monitoring double-wall glass reinforced plastic pipe conveying system |
| CN110715119A (en) * | 2019-09-27 | 2020-01-21 | 南京新核复合材料有限公司 | Multifunctional double-wall glass fiber reinforced plastic pipeline and preparation method thereof |
| CN113719670A (en) * | 2021-08-31 | 2021-11-30 | 黑龙江贞财管道有限公司 | ESEPI prefabricated heat-preservation direct-buried heat-resistant high-density polyethylene low-temperature heat supply composite pipe |
| EP4008737A1 (en) * | 2020-12-02 | 2022-06-08 | Logstor A/S | An insulated pipe with an increased compressive strength and axial shear strength |
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