CN113427806B - Preparation method of polyurethane prefabricated direct-buried heat-insulation composite pipe - Google Patents
Preparation method of polyurethane prefabricated direct-buried heat-insulation composite pipe Download PDFInfo
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- CN113427806B CN113427806B CN202110604402.2A CN202110604402A CN113427806B CN 113427806 B CN113427806 B CN 113427806B CN 202110604402 A CN202110604402 A CN 202110604402A CN 113427806 B CN113427806 B CN 113427806B
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 47
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 47
- 238000009413 insulation Methods 0.000 title claims abstract description 20
- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 41
- 238000000498 ball milling Methods 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 239000011550 stock solution Substances 0.000 claims abstract description 18
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000002244 precipitate Substances 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000004640 Melamine resin Substances 0.000 claims abstract description 5
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- 238000005187 foaming Methods 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 239000005056 polyisocyanate Substances 0.000 claims description 6
- 229920001228 polyisocyanate Polymers 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 2
- 239000004088 foaming agent Substances 0.000 claims description 2
- 239000003381 stabilizer Substances 0.000 claims description 2
- 229920002554 vinyl polymer Polymers 0.000 claims description 2
- 238000002156 mixing Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 229920005830 Polyurethane Foam Polymers 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920005862 polyol Polymers 0.000 description 3
- 150000003077 polyols Chemical class 0.000 description 3
- 239000011496 polyurethane foam Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 229920001748 polybutylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- JLTDJTHDQAWBAV-UHFFFAOYSA-N N,N-dimethylaniline Chemical compound CN(C)C1=CC=CC=C1 JLTDJTHDQAWBAV-UHFFFAOYSA-N 0.000 description 1
- SVYKKECYCPFKGB-UHFFFAOYSA-N N,N-dimethylcyclohexylamine Chemical compound CN(C)C1CCCCC1 SVYKKECYCPFKGB-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012973 diazabicyclooctane Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/10—Metal compounds
- C08K3/14—Carbides
-
- 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
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
-
- 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
- C08K9/10—Encapsulated ingredients
-
- 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
- C08G2101/00—Manufacture of cellular products
-
- 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
- C08G2110/0083—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)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a preparation method of a polyurethane prefabricated direct-buried heat insulation composite pipe, belonging to the technical field of prefabricated direct-buried heat insulation pipeline preparation; the concrete scheme is that the polyurethane stock solution contains an active carbon-graphene inclusion, and the preparation method of the inclusion comprises the following steps: ball-milling tungsten carbide and graphene powder together, adding activated carbon, continuing ball-milling, adding water into a ball-milled mixture, adjusting the pH to 7.2-7.9, carrying out ultrasonic treatment under a stirring state, and carrying out centrifugal filtration on the solution after ultrasonic treatment to obtain a precipitate; treating the precipitate at the temperature of 350-550 ℃ for 20-30min to obtain activated carbon-graphene powder; embedding the activated carbon-graphene powder by using melamine resin to obtain an activated carbon-graphene embedded substance; the polyurethane heat-insulating layer prepared by the invention has the advantages of high strength, good ring stiffness, light weight and high waterproof performance.
Description
Technical Field
The invention belongs to the technical field of prefabricated direct-buried heat insulation pipeline preparation, and relates to a preparation method of a polyurethane prefabricated direct-buried heat insulation composite pipe.
Background
The prefabricated direct-buried heat-insulating energy-saving pipe is used as a heat supply pipeline, is widely applied to the aspects of chemical pipeline engineering, electric power, petroleum, central air-conditioning ventilation pipelines, central heat supply, municipal engineering and the like, and has the advantages of high-efficiency heat insulation, water resistance, corrosion resistance, flame retardance, cold resistance, light capacity, high strength, convenience in construction and the like. The prefabricated direct-buried heat-insulating energy-saving pipe is formed by compounding a working pipe, a heat-insulating pipe (or called a heat-insulating layer) and an outer protective pipe. The working pipe is a heat-resistant plastic pipe such as crosslinked polyethylene (PE-X), heat-resistant polyethylene (PE-RT), random copolymer polypropylene (PP-R), Polybutylene (PB) and the like; the heat preservation pipe is generally rigid polyurethane foam; the outer jacket is typically a thin walled tube of High Density Polyethylene (HDPE).
In the normal operation of the centralized heat supply pipe network, high-low temperature hot water alternately operates, the working pipe, the heat preservation layer and the outer protective pipe generate relative displacement force due to different thermal expansion amounts, and if the axial shear strength of the prefabricated direct-buried heat preservation pipeline is low, the structure of the heat preservation pipe is not tight, and the heat preservation performance of the heat preservation layer is easily damaged by the displacement force. In addition, the direct-buried insulating pipe working environment needs to bear the external pressure of soil, especially for the prefabricated direct-buried insulating pipe with a large pipe diameter specification, along with the increase of the pipe diameter, the phenomenon that the insulating pipe and the working pipeline cannot be tightly attached easily occurs, and therefore the insulating effect of the insulating pipe is influenced.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides a preparation method of a polyurethane prefabricated direct-buried heat insulation composite pipe, so as to improve the strength of a heat insulation layer in the polyurethane prefabricated direct-buried heat insulation composite pipe.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A method for preparing polyurethane prefabricated direct-buried heat-insulating composite pipe includes embedding and fixing a working pipeline in an outer protection pipeline, forming a cavity between the working pipeline and the outer protection pipeline, filling prepared polyurethane stock solution into the cavity through a high-pressure foaming machine for free pressure foaming to form a polyurethane heat-insulating layer; the preparation method is characterized in that the polyurethane stock solution comprises an active carbon-graphene inclusion, and the preparation of the inclusion comprises the following steps:
a) weighing 5-10% of tungsten carbide and 2-10% of graphene powder by mass percentage, and the balance of activated carbon powder, ball-milling the tungsten carbide and the graphene powder for 1-2h, adding activated carbon, and continuing ball-milling for 20-30min to obtain a ball-milled mixture.
b) Adding water into the ball-milled mixture, adjusting the pH value to 7.2-7.9, carrying out ultrasonic treatment under a stirring state, and carrying out centrifugal filtration on the solution after ultrasonic treatment to obtain a precipitate.
c) And (3) treating the precipitate at the temperature of 350-550 ℃ for 20-30min to obtain the activated carbon-graphene powder.
d) And embedding the activated carbon-graphene powder by using melamine resin to obtain the activated carbon-graphene embedded substance.
Preferably, the mass percentage of the activated carbon-graphene embedding substance in the polyurethane stock solution is 1.5-5.5%.
Preferably, the polyurethane stock solution comprises a white material and polyisocyanate, wherein the mass ratio of the white material to the polyisocyanate is 1: 1-2.
Preferably, the ball milling is dry ball milling, and the rotation speed of the ball milling is 240-300 r/min.
Preferably, the temperature of the ultrasonic treatment is 65-85 ℃, the time is 2-5h, and the frequency is 40-120 KHZ.
Preferably, the polyurethane stock solution further comprises a foam stabilizer, a catalyst and a foaming agent.
Preferably, the inner wall surface of the outer jacket pipe and the outer wall surface of the working pipe are coated with an adhesive, respectively, before the working pipe is nested inside the outer jacket pipe.
Preferably, the adhesive is polyvinyl formal or polyurethane adhesive
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, tungsten carbide and graphene are ball-milled together, so that the tungsten carbide and the graphene have smaller particle sizes and are mixed more uniformly, and meanwhile, the tungsten carbide has a hexagonal crystal structure, so that the graphene is prevented from agglomerating in the ball-milling process. The active carbon has a large number of holes, and tungsten carbide and graphene with small particle sizes can continuously enter the holes of the active carbon in the ball milling process and are adsorbed on the surface of the active carbon. Through low-temperature ultrasonic treatment, tungsten carbide and graphene with small particle sizes further enter the activated carbon, and the combination of the tungsten carbide and the activated carbon is more stable; the mixture after high-temperature treatment enables tungsten carbide and graphene small particles to be combined in the activated carbon more stably, and in the high-temperature treatment, the activated carbon further develops a part of micropores and mesopores. The mixture is then embedded so that the structure of the mixture is not destroyed in the subsequent foaming operation. The polyurethane heat-insulating layer added with the activated carbon-graphene embedding substance is internally provided with the activated carbon which stably adsorbs graphene and tungsten carbide, and the embedded closed holes are formed, so that the polyurethane heat-insulating layer is high in strength, good in ring stiffness, light in weight and high in waterproof performance.
Detailed Description
In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. The technical solution of the present invention is described in detail with reference to the following examples, but the scope of protection is not limited thereto.
Example 1
A preparation method of a polyurethane prefabricated direct-buried heat insulation composite pipe comprises the following steps:
step 1: preparing a prefabricated pipe cavity mold: polyurethane adhesives are respectively coated on the inner wall surface of the outer protection pipeline and the outer wall surface of the working pipeline, the working pipeline is nested and fixed in the outer protection pipeline, and two ports of the working pipeline and the outer protection pipeline are sealed by flanges.
Step 2: preparing a white material: respectively weighing 90kg of combined polyether polyol DC380, 50kg of polyether polyol DC635C, 25kg of polyether polyol N210, 2kg of silicone oil SD624, 0.5kg of dimethylcyclohexylamine catalyst PC-8, 2.3kg of dimethylaniline catalyst DABCO and 2kg of H 2 And (4) putting the mixture into a mixing kettle, and stirring and mixing the mixture uniformly.
And 3, step 3: preparing an active carbon-graphene embedding material: weighing 5% of tungsten carbide and 10% of graphene powder by mass, and the balance of activated carbon powder, carrying out dry ball milling treatment on the tungsten carbide and the graphene powder for 2 hours, adding activated carbon, and continuing ball milling for 20min to obtain a ball-milled mixture; the rotation speed of the ball milling is 240-300 r/min.
Adding water with the mass 5 times of that of the ball-milled mixture into the ball-milled mixture, adjusting the pH value to 7.5 by using sodium bicarbonate, performing ultrasonic treatment under a stirring state, and performing centrifugal filtration on the solution after the ultrasonic treatment to obtain a precipitate; wherein the ultrasonic treatment temperature is 75 deg.C, time is 3h, and frequency is 60 KHZ.
And (3) treating the precipitate in a high-temperature furnace at 550 ℃ for 20min to obtain activated carbon-graphene powder. And then embedding the activated carbon-graphene powder by using melamine resin to obtain the activated carbon-graphene embedded substance. The embedding adopts a conventional embedding process.
And 4, step 4: preparing the rigid polyurethane foam: calculating the volume of a cavity die between the working steel pipe and the outer protective pipe, calculating the mass of the polyurethane stock solution to be filled according to the overfilling density, and mixing the white material and the polyisocyanate according to the ratio of 1:1, adding 2 mass percent of activated carbon-graphene embedding substances to form a polyurethane stock solution, uniformly mixing by a high-pressure foaming machine, and then filling the mixture into a prefabricated pipeline cavity mold, so that the polyurethane stock solution is subjected to free pressure foaming in a closed space to form a polyurethane heat-insulating layer.
Example 2
A method for preparing a polyurethane prefabricated direct-buried heat-insulation composite pipe comprises the following steps 1, 2 and 4, which are the same as those in example 1, except that the step 3:
preparing an active carbon-graphene embedding substance: weighing 8% of tungsten carbide and 5% of graphene powder by mass, and the balance of activated carbon powder, carrying out dry ball milling on the tungsten carbide and the graphene powder for 1h, adding activated carbon, and continuing ball milling for 20min to obtain a ball-milled mixture; the rotation speed of the ball milling is 240-300 r/min.
Adding water with the mass 5 times of that of the ball-milled mixture into the ball-milled mixture, adjusting the pH value to 7.9 by using sodium bicarbonate, performing ultrasonic treatment under a stirring state, and performing centrifugal filtration on the solution after the ultrasonic treatment to obtain a precipitate; wherein the ultrasonic treatment temperature is 65 deg.C, the time is 2h, and the frequency is 80 KHZ.
And (3) treating the precipitate in a high-temperature furnace at 500 ℃ for 30min to obtain activated carbon-graphene powder. And then embedding the activated carbon-graphene powder by using melamine resin to obtain the activated carbon-graphene embedded substance. The embedding adopts a conventional embedding process.
Example 3
A method for preparing a polyurethane prefabricated direct-buried heat-insulation composite pipe comprises the following steps 1, 2 and 3, which are the same as those in example 1, except that the step 4:
preparing the rigid polyurethane foam: calculating the volume of a cavity mould between the working steel pipe and the outer protective pipe, calculating the mass of the polyurethane stock solution to be filled according to the over-filling density, and mixing the white material and the polyisocyanate according to the ratio of 1: and 2, after the materials are matched according to the material ratio, adding 5% by mass of activated carbon-graphene embedding substances to form a polyurethane stock solution, uniformly mixing the polyurethane stock solution by a high-pressure foaming machine, and then pouring the mixture into a prefabricated pipeline cavity die, so that the polyurethane stock solution is subjected to free pressure foaming in a closed space to form a polyurethane heat-insulating layer.
The basic technical indexes of the polyurethane prefabricated direct-buried heat-insulation composite pipe prepared in the embodiment 1-3 are as follows:
while the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method for preparing polyurethane prefabricated direct-buried heat-insulating composite pipe includes embedding and fixing a working pipeline in an outer protection pipeline, forming a cavity between the working pipeline and the outer protection pipeline, filling prepared polyurethane stock solution into the cavity through a high-pressure foaming machine for free pressure foaming to form a polyurethane heat-insulating layer; the preparation method is characterized in that the polyurethane stock solution comprises an active carbon-graphene inclusion, and the preparation of the inclusion comprises the following steps:
a) weighing 5-10% of tungsten carbide and 2-10% of graphene powder by mass percentage, and the balance of activated carbon powder, ball-milling the tungsten carbide and the graphene powder for 1-2h, adding activated carbon, and continuing ball-milling for 20-30min to obtain a ball-milled mixture;
b) adding water into the ball-milled mixture, adjusting the pH value to 7.2-7.9, carrying out ultrasonic treatment under a stirring state, and carrying out centrifugal filtration on the solution after ultrasonic treatment to obtain a precipitate;
c) treating the precipitate at the temperature of 350-550 ℃ for 20-30min to obtain activated carbon-graphene powder;
d) and embedding the activated carbon-graphene powder by using melamine resin to obtain the activated carbon-graphene embedded substance.
2. The method for preparing the polyurethane prefabricated direct-buried heat-insulation composite pipe according to claim 1, wherein the mass percentage of the activated carbon-graphene embedding substance in the polyurethane stock solution is 1.5-5.5%.
3. The preparation method of the polyurethane prefabricated direct-buried heat insulation composite pipe according to claim 2, characterized in that the polyurethane stock solution comprises white material and polyisocyanate, and the mass ratio of the white material to the polyisocyanate is 1: 1-2.
4. The method for preparing the polyurethane prefabricated direct-buried heat-preservation composite tube as claimed in claim 1, wherein the ball milling is dry ball milling, and the rotation speed of the ball milling is 240-300 r/min.
5. The method for preparing the polyurethane prefabricated direct-buried heat-insulation composite pipe according to claim 1, wherein the ultrasonic treatment temperature is 65-85 ℃, the time is 2-5h, and the frequency is 40-120 KHZ.
6. The method for preparing the polyurethane prefabricated direct-buried heat-insulation composite pipe according to the claim 1, wherein the polyurethane stock solution further comprises a foam stabilizer, a catalyst and a foaming agent.
7. The method for preparing the polyurethane prefabricated direct-buried heat-insulation composite pipe according to claim 1, wherein before the working pipeline is nested in the outer protection pipeline, an adhesive is respectively coated on the surface of the inner wall of the outer protection pipeline and the surface of the outer wall of the working pipeline.
8. The method for preparing the polyurethane prefabricated direct-buried heat-insulation composite pipe as claimed in claim 7, wherein the adhesive is polyvinyl formal or polyurethane adhesive.
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