CN109944988A - A kind of abrasion resistant polyurethane double layer innerliner pipeline and the preparation method and application thereof - Google Patents
A kind of abrasion resistant polyurethane double layer innerliner pipeline and the preparation method and application thereof Download PDFInfo
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- CN109944988A CN109944988A CN201711393020.XA CN201711393020A CN109944988A CN 109944988 A CN109944988 A CN 109944988A CN 201711393020 A CN201711393020 A CN 201711393020A CN 109944988 A CN109944988 A CN 109944988A
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Abstract
The present invention provides a kind of abrasion resistant polyurethane double layer innerliner pipelines and the preparation method and application thereof, the abrasion resistant polyurethane double layer innerliner pipeline includes thermoplastic polyurethane liner layer pipeline and casting type polyurethane filled layer bilayer polyurethane structural, wherein, a plurality of deep floor is equipped on the outside of thermoplastic polyurethane liner layer pipeline, casting type polyurethane filled layer is filled between a plurality of deep floor.Double layer innerliner pipeline of the invention provides high-wear resistance, high impact resistance by the wear-resisting thermoplastic polyurethane liner layer of innermost layer for multiple tube, by the common casting type polyurethane filled layer of middle layer provide water resistance, with the high-adhesive-strength of steel pipe, can be used for that the liquid such as petroleum oil-sand, metallurgical ore in sand form are solid, conveying of Dual-Phrase Distribution of Gas olid.
Description
Technical field
The present invention relates to a kind of abrasion resistant polyurethane double layer innerliner pipeline and the preparation method and application thereof, the pipeline is available
Make oil-sand and ore in sand form conveyance conduit.
Background technique
Polyurethane liner pipe is the conveyance conduit of solid, gas-solid, two phase flow conveying operating condition suitable for liquid, has been applied at present
The conveying of petroleum oil-sand, the multiple fields such as the ore in sand form conveying and the conveying of chemical plant chemical mediator of metallurgical mine.
Conventional urethane liner pipe is often made of the method in steel duct rotary casting polyurethane, and structure is such as
Shown in Fig. 1, casting type polyurethane liner layer 20, due to the inherent characteristic of casting type polyurethane, this pipeline are equipped in steel pipe 10
The phenomenon that layer of polyurethane caused by bad, poor water resistance that there are wear-resisting properties and adhesive property are bad and steel pipe layer are removed, from
And make pipe wear too fast and reveal, or cause the blocking in pipeline, it needs to shut down Measuring error, increases construction cost, wave
Take human and material resources resource.
Summary of the invention
It is an object of the present invention to provide a kind of wear-resisting polyurethane liner pipes.
Another object of the present invention is to provide a kind of methods for preparing the wear-resisting polyurethane liner pipe.
Another object of the present invention is to provide the applications of the wear-resisting polyurethane liner pipe.
In order to achieve the above object, technology mainly compound using the double-deck polyurethane in the present invention, by thermoplastic polyurethane
Wear-resisting property, impact resistance are combined with the water resistance of casting type polyurethane, high-adhesive-strength, and the multiple tube of preparation is available
The solid, gas in liquid such as petroleum oil-sand, the metallurgical ores in sand form that there is super-high wear-resistant performance, water resistance, high-adhesive-strength to require pipeline
The conveying of fixed double phase flow.
On the one hand, the present invention provides a kind of abrasion resistant polyurethane double layer innerliner pipelines comprising thermoplastic polyurethane liner
Layer pipeline and casting type polyurethane filled layer bilayer polyurethane structural, wherein be equipped on the outside of thermoplastic polyurethane liner layer pipeline
A plurality of deep floor, casting type polyurethane filled layer are filled between a plurality of deep floor.
Specific embodiment according to the present invention, abrasion resistant polyurethane double layer innerliner pipeline of the invention further include being located to pour
Infuse the steel pipe on the outside of type polyurethane filled layer.
Abrasion resistant polyurethane double layer innerliner pipeline of the invention has high-wear resistance, water resistance, high-adhesive-strength, fits
Solid, Dual-Phrase Distribution of Gas olid the conveying for liquid such as petroleum oil-sand, metallurgical ores in sand form.
Specific embodiment according to the present invention, abrasion resistant polyurethane double layer innerliner pipeline of the invention, the casting type are poly-
The material of urethane filled layer can be common casting type polyurethane material in the prior art.Preferred implementation side according to the present invention
Case, the composition of raw materials of the casting type polyurethane filled layer are as follows: 100~150 parts by weight of polyether polyol；5~20 weight of chain extender
Measure part；50~90 parts by weight of polyisocyanates.
Specific embodiment according to the present invention, in the composition of raw materials of filling polyurethane layer of the invention, the polyethers is more
First alcohol can include but is not limited to one of PTG1000, PTG2000, PCL1000 and PCL2000 or a variety of；Preferably, institute
Stating polyether polyol includes but is not limited to PTG1000, PTG2000, PCL1000 and PCL2000, and the mixed proportion of each component can be with
For 1~2:1~2:1~2:1~2, more preferably mixed by equal proportion.
Specific embodiment according to the present invention, in the composition of raw materials of filling polyurethane layer of the invention, the chain extender
It may include TMP and/or BDO；Preferably, the equal proportion mixture of TMP and BDO is selected.
Specific embodiment according to the present invention, in the composition of raw materials of filling polyurethane layer of the invention, the polyisocyanate cyanogen
Acid esters may include MDI and/or TDI；Preferably, the equal proportion mixture of MDI and TDI is selected.
Specific embodiment according to the present invention, abrasion resistant polyurethane double layer innerliner pipeline of the invention, the thermoplastic poly
The material of urethane liner layer pipeline is wear-resisting thermoplastic polyurethane material.
Specific embodiment according to the present invention, abrasion resistant polyurethane double layer innerliner pipeline of the invention, the thermoplastic poly
The composition of raw materials of urethane liner layer are as follows: 100~150 parts by weight of thermoplastic polyurethane elastomer；1~10 parts by weight of wear resistant filler；
1~5 parts by weight of remover.
Specific embodiment according to the present invention, in the composition of raw materials of thermoplastic polyurethane liner layer of the invention, preferably
Ground, the hardness 85~95 of the thermoplastic polyurethane elastomer, tensile strength >=25MPa, tearing strength >=70N/mm.The present invention
In to other performances of thermoplastic polyurethane elastomer without particular/special requirement.Being suitable for the invention thermoplastic polyurethane elastomer can
With commercially available, such as the production of ten thousand China can be bought, the trade mark mainly has 8190,8290,8264 and A890 etc..
Specific embodiment according to the present invention, it is described in the composition of raw materials of thermoplastic polyurethane liner layer of the invention
Wear resistant filler may include one or more of carbon nanotube, molybdenum disulfide, graphene and montmorillonite.When using a variety of mixing
When, to the mixed proportion of each component without particular/special requirement.
Specific embodiment according to the present invention, it is described in the composition of raw materials of thermoplastic polyurethane liner layer of the invention
Conventional release agent in fields, such as silicone grease, silicone oil or other lubricant greases etc. can be used in release agent.
Specific embodiment according to the present invention, abrasion resistant polyurethane double layer innerliner pipeline of the invention, the thermoplastic poly
The a plurality of floor being arranged on the outside of urethane liner layer pipeline, can play the self-supporting for making liner layer pipeline and determine in steel pipe
Position effect, according to the difference of multiple tube caliber, number of ribs can be adjusted accordingly, and usually 4~16.For example, multiple tube
Diameter (internal diameter) 800~1000mm, settable 12~16 floors；Compound 500~800mm of pipe diameter, settable 8~14 ribs
Plate；Compound 200~500mm of pipe diameter, settable 6~10 floors；Compound pipe diameter < 200mm, settable 4~8 floors.
Specific embodiment according to the present invention, different according to the wall thickness of thermoplastic polyurethane liner layer pipeline, floor is thick
Degree may range from 5~20mm, and floor width range can be 5~30mm.
Specific embodiment according to the present invention, a plurality of floor can be evenly dispersed point on the outside of polyurethane liner layer pipelines
Cloth.The length direction of every floor can be consistent with pipe lengths, can also there is certain spiral angle.Every floor can
To be continuous or intermittent.
On the other hand, the present invention also provides the method for preparing the abrasion resistant polyurethane double layer innerliner pipeline, this method packets
It includes:
The raw material of thermoplastic polyurethane liner layer is uniformly mixed, preparatory extrusion molding is the thermoplasticity with rib structure
Polyurethane liner layer pipeline, then the liner layer pipeline is placed in steel pipe, casting type polyurethane material is filled in the annular space of the two
Material forms casting type polyurethane filled layer, and obtains the abrasion resistant polyurethane double layer innerliner pipeline.
Specific embodiment according to the present invention in method of the invention, can refer in thermoplastic polyurethane extrusion molding
Steel tube standard API 5L controls the ovality, concentricity and straightness of pipe, to guarantee installation accuracy when being put into steel pipe.
Specific embodiment according to the present invention in method of the invention, when liner layer is installed to steel pipe, needs to guarantee steel
The cleanliness of inside pipe wall and liner layer outer wall.
Specific embodiment according to the present invention, in method of the invention, when cast polyurethane material, needs to control casting
Speed avoids excessive velocities from having little time to be vented and generate defect.Specific embodiment according to the present invention, the polyurethane material
Poring rate can be 0.9kg/min~50kg/min.More specific speed can be adjusted according to different tube diameters and wall thickness, and caliber is got over
Greatly, the thicker poring rate of wall thickness can suitably increase in the range, and caliber is smaller, the thinner speed of wall thickness can be reduced suitably.
Specific embodiment according to the present invention, abrasion resistant polyurethane double layer innerliner pipeline of the invention, steel pipe and polyurethane,
There is good adhesive property, general > 10.6kN/m between two layers of polyurethane (testing standard refers to GB/T7760-2003).
On the other hand, the present invention also provides the applications of the abrasion resistant polyurethane double layer innerliner pipeline, and specifically it is being made
For application of the liquid admittedly and/or in the conveyance conduit of Dual-Phrase Distribution of Gas olid such as petroleum oil-sand, metallurgical ores in sand form.Abrasion resistant polyurethane of the invention
Double layer innerliner pipeline provides high-wear resistance by the wear-resisting thermoplastic polyurethane liner layer of innermost layer for multiple tube, by middle layer
Casting type polyurethane filled layer provides water resistance and the high-adhesive-strength with steel pipe, has high-wear resistance, water resistance, height
Adhesive strength, solid, Dual-Phrase Distribution of Gas olid the conveying suitable for liquid such as petroleum oil-sand, metallurgical ores in sand form.
Detailed description of the invention
Fig. 1 is prior art polyurethane liner pipe structural schematic diagram, wherein 10 be steel pipe, 20 be casting type polyurethane
Layer.
Fig. 2 is abrasion resistant polyurethane double layer innerliner pipeline configuration schematic diagram of the present invention, wherein 1 is steel pipe, 2 be the poly- ammonia of casting type
Ester filled layer, 3 be wear-resistant thermoplastic polyurethane liner layer pipeline, and 31 be floor.
Fig. 3 is a kind of schematic cross-section of specific embodiment of wear-resistant thermoplastic polyurethane liner layer.
Fig. 4 is abrasion resistant polyurethane double layer innerliner pipeline production process schematic diagram of the present invention.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be further described with embodiment, these embodiments are not limited to this hair
Bright, for those skilled in the art, the invention may be variously modified and varied.It is all in the spirit and principles in the present invention
Within, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
It is shown in Figure 2, for the structure of the abrasion resistant polyurethane double layer innerliner pipeline of some specific embodiments of the present invention
Schematic diagram.As shown in Fig. 2, the abrasion resistant polyurethane double layer innerliner pipeline include steel pipe 1, it is casting type polyurethane filled layer 2, wear-resisting
Thermoplastic polyurethane liner layer pipeline 3 is equipped with a plurality of deep floor 31 on the outside of wear-resisting thermoplastic polyurethane liner layer pipeline 3.It pours
Note type polyurethane filled layer 2 is filled between a plurality of deep floor, is clipped in steel pipe 1 and wear-resisting thermoplastic polyurethane liner layer pipeline
Between 3.
The production method of abrasion resistant polyurethane double layer innerliner pipeline of the invention includes the following steps:
1, the extrusion of wear-resisting thermoplastic polyurethane liner layer pipeline:
Wear-resisting thermoplastic polyurethane raw material is measured respectively by recipe requirements, it is then cold mixed with the mixed machine low speed of high speed heat respectively
Machine is blended together to stir evenly, and puts into double screw extruder after sieving, and raw material plasticizing is in molten state, from molding die
Extrusion molding pipe, then by tubulose by sizing mill sizing, to reach the diameter and thickness of the polyurethane wear resistant internal lining pipe of technique requirement
Degree is cut into required length after water cooled case sizing.The internal lining pipe pipe outer wall of extrusion contains several deep floors, and structure is such as
Shown in Fig. 3, it is stand-by to be prepared into wear-resisting thermoplastic polyurethane liner layer.
2, steel pipe (steel pipe 1 in Fig. 2) inner surface treatment:
(1) it cleans
Steel pipe inner wall is cleaned using solvent, emulsion, to reach oil removing, grease, dust, lubricant and similar organic matter.
(2) derusting is penetrated in spray (throwing)
Steel pipe inner wall is handled using sandblasting or shot-blasting machine, the surface roughness needed for reaching derusting and obtaining
Purpose.
(3) (brush) coating adhesive is sprayed
After the complete steel pipe progress drying and processing of sandblasting will be cleaned, (brush) is equably sprayed in its inner surface and applies one layer of viscoelastic polyurethane
Mixture, it is stand-by after drying.
3, the compound positioning of wear-resisting thermoplastic polyurethane liner layer and steel pipe:
In the steel pipe that the merging of wear-resisting thermoplastic polyurethane liner layer is handled well, its both ends is sealed with positioning mold
Processing, keeps perpendicular to the ground for homogeneous tube.
4, the casting of casting type polyurethane filled layer:
The raw material of casting type polyurethane filled layer is pressed into formula metering, performed polymer is synthesized first with reaction kettle, by pre-polymerization
Body is sealed for use, will be added in polyurethane casting machine after the drying of performed polymer heating, vacuum with chain extender, casting machine is arranged,
Pouring head is inserted into the annular space of wear-resisting thermoplastic polyurethane liner layer and steel pipe when casting and is poured, it is to be cast after the completion to homogeneous tube
Heating makes casting type polyurethane curing molding, forms casting type polyurethane filled layer.
5, it demoulds.
In the present invention, it is preferable that the wear-resisting thermoplastic polyurethane innerliner forumulations are denoted as by weight: thermoplastic poly ammonia
100~150 parts of ester elastomer；1~10 part of wear resistant filler, wear resistant filler includes carbon nanotube, molybdenum disulfide, graphene and Meng Tuo
One or more of soil, 1~5 part of remover.
Contain a number of floor on the outside of the wear-resisting thermoplastic polyurethane liner layer, according to the difference of compound caliber, rib
Plate quantity is 4~16.
The common casting type polyurethane filled layer formula is denoted as: 100~150 parts of polyether polyol；It is wear-resisting
1~10 part of filler, wear resistant filler includes one or more of carbon nanotube, molybdenum disulfide, graphene and montmorillonite；Chain extender
5~20 parts；Polyisocyanates: 50~90 parts.
Embodiment 1
In the abrasion resistant polyurethane double layer innerliner pipeline of the present embodiment, wear-resisting thermoplastic polyurethane liner layer contains 4 floors,
Formula is denoted as: 100 parts of thermoplastic polyurethane elastomer, 5 parts of wear resistant filler carbon nanotube, 3 parts of remover.This example
The thermoplastic polyurethane elastomer of middle use is the ten thousand China production of purchase, the trade mark 8190.Used thermoplastic polyurethane elastic
The Essential Performance Requirements of body: hardness: 85~95, tensile strength >=25MPa, tearing strength >=70N/mm.
Casting type polyurethane fills layer formula are as follows: 100 parts of polyether polyol, 10 parts of chain extender, 50 parts of polyisocyanates.This
In embodiment: polyether polyol is the equal proportion mixture of PTG and PCL, and chain extender is the equal proportion mixture of BDO and TMP, more
Isocyanates is the equal proportion mixture of TDI and MDI.
In the present embodiment, wear-resisting thermoplastic polyurethane liner layer line size is: internal diameter 193.7mm, wall thickness 15mm, length
5m.Steel pipe uses wall thickness for 9.3mm, 10 inches of steel pipes of length 5m.
The production method of the abrasion resistant polyurethane double layer innerliner pipeline of the present embodiment includes the following steps (reference can be made to Fig. 4 institute
Show):
1, the extrusion of wear-resisting thermoplastic polyurethane liner layer pipeline
Wear-resisting thermoplastic polyurethane raw material is measured respectively by recipe requirements, it is then cold mixed with the mixed machine low speed of high speed heat respectively
Machine is blended together to stir evenly, and mixing speed does not do particular/special requirement, adjusts according to the actual situation.Twin-screw is put into after sieving
In extruder, 180~220 DEG C of extrusion temperature, raw material plasticizing is in molten state, the extrusion molding pipe from molding die, then will pipe
Shape is cut after water cooled case sizing by sizing mill sizing with reaching the diameter and thickness of the polyurethane wear resistant internal lining pipe of technique requirement
It is cut into required length.The internal lining pipe pipe outer wall of extrusion contains several deep floors, and structure is as shown in figure 3, be prepared into wear-resisting
Thermoplastic polyurethane liner layer is stand-by.
2, steel pipe (steel pipe 1 in Fig. 2) inner surface treatment
(1) it cleans
Steel pipe inner wall is cleaned using solvent, emulsion, to reach oil removing, grease, dust, lubricant and similar organic matter.
(2) derusting is penetrated in spray (throwing)
Steel pipe inner wall is handled using sandblasting or shot-blasting machine, the surface roughness needed for reaching derusting and obtaining
Purpose.
(3) (brush) coating adhesive is sprayed
After the complete steel pipe progress drying and processing of sandblasting will be cleaned, (brush) is equably sprayed in its inner surface and applies one layer of viscoelastic polyurethane
Mixture, it is stand-by after drying.
3, the compound positioning of wear-resisting thermoplastic polyurethane liner layer and steel pipe
In the steel pipe that the merging of wear-resisting thermoplastic polyurethane liner layer is handled well, its both ends is sealed with positioning mold
Processing, keeps perpendicular to the ground for homogeneous tube.
4, the casting of casting type polyurethane filled layer
The raw material of casting type polyurethane filled layer is pressed into formula metering, performed polymer is synthesized first with reaction kettle, by pre-polymerization
Body is sealed for use, will be added in polyurethane casting machine after the drying of performed polymer heating, vacuum with chain extender, casting machine is arranged,
Pouring head is inserted into the annular space of wear-resisting thermoplastic polyurethane liner layer and steel pipe when casting and is poured, the casting of casting type polyurethane
Speed 5kg/min.Homogeneous tube is heated after the completion of to be cast, makes casting type polyurethane curing molding, casting type polyurethane is formed and fills out
Fill layer.
5, it demoulds.
Embodiment 2
In the abrasion resistant polyurethane double layer innerliner pipeline of the present embodiment, wear-resisting thermoplastic polyurethane liner layer contains 8 floors,
Formula is denoted as: 100 parts of thermoplastic polyurethane elastomer, 5 parts of wear resistant filler molybdenum disulfide, 3 parts of remover；This example
The thermoplastic polyurethane elastomer of middle use is the ten thousand China production of purchase, the trade mark 8290.Used thermoplastic polyurethane elastic
The Essential Performance Requirements of body: hardness: 85~95, tensile strength >=25MPa, tearing strength >=70N/mm.
Casting type polyurethane fills layer formula are as follows: and 100 parts of polyether polyol, 13 parts of chain extender, polyisocyanates: 60 parts.
In the present embodiment: polyether polyol is the equal proportion mixture of PTG and PCL, and chain extender is the equal proportion mixture of BDO and TMP,
Polyisocyanates is the equal proportion mixture of TDI and MDI.
The production method of the abrasion resistant polyurethane double layer innerliner pipeline of the present embodiment is substantially the same manner as Example 1.
Embodiment 3
In the abrasion resistant polyurethane double layer innerliner pipeline of the present embodiment, wear-resisting thermoplastic polyurethane liner layer contains 8 floors,
Formula is denoted as: 100 parts of thermoplastic polyurethane elastomer, 2 parts of wear resistant filler graphene, 3 parts of carbon nanotube, and remover
3 parts；The thermoplastic polyurethane elastomer used in this example is the ten thousand China production of purchase, and the trade mark mainly has 8190.It is used
The Essential Performance Requirements of thermoplastic polyurethane elastomer: hardness: 85~95, tensile strength >=25MPa, tearing strength >=70N/
mm。
Casting type polyurethane fills layer formula are as follows: and 100 parts of polyether polyol, 15 parts of chain extender, polyisocyanates: 70 parts.
In the present embodiment: polyether polyol is the equal proportion mixture of PTG and PCL, and chain extender is the equal proportion mixture of BDO and TMP,
Polyisocyanates is the equal proportion mixture of TDI and MDI.
The production method of the abrasion resistant polyurethane double layer innerliner pipeline of the present embodiment is substantially the same as embodiment 1.
Embodiment 4
In the abrasion resistant polyurethane double layer innerliner pipeline of the present embodiment, wear-resisting thermoplastic polyurethane liner layer contains 12 floors,
Its formula is denoted as: 100 parts of thermoplastic polyurethane elastomer, 3 parts of wear resistant filler montmorillonite, 1 part of graphene, carbon nanometer
2 parts of pipe, 3 parts of remover；The thermoplastic polyurethane elastomer used in this example is the ten thousand China production of purchase, trade mark A890.Institute
The Essential Performance Requirements of the thermoplastic polyurethane elastomer of use: hardness: 85~95, tensile strength >=25MPa, tearing strength >=
70N/mm。
Casting type polyurethane fills layer formula are as follows: and 100 parts of polyether polyol, 18 parts of chain extender, polyisocyanates: 80 parts.
In the present embodiment: polyalcohol is the equal proportion mixture of PTG and PCL, and chain extender is the equal proportion mixture of BDO and TMP, isocyanide
Acid esters is the equal proportion mixture of TDI and MDI.
The production method of the abrasion resistant polyurethane double layer innerliner pipeline of the present embodiment is substantially the same as embodiment 1.
Polyurethane material and several frequently seen pipeline in each embodiment are compared with material property referring to table 1.
Polyurethane material in each embodiment of table 1 is compared with several frequently seen pipeline with material property
As can be seen from Table 1, polyurethane double layer innerliner pipeline of the invention has good wear-resisting and water resistance, each layer
Between adhesive property it is good.
Claims (10)
1. a kind of abrasion resistant polyurethane double layer innerliner pipeline comprising thermoplastic polyurethane liner layer pipeline and casting type polyurethane are filled out
Fill layer bilayer polyurethane structural, wherein a plurality of deep floor, the poly- ammonia of casting type are equipped on the outside of thermoplastic polyurethane liner layer pipeline
Ester filled layer is filled between a plurality of deep floor.
2. pipeline according to claim 1 further includes the steel pipe on the outside of casting type polyurethane filled layer.
3. pipeline according to claim 1, wherein the composition of raw materials of the material of the casting type polyurethane filled layer are as follows:
100~150 parts by weight of polyether polyol；5~20 parts by weight of chain extender；50~90 parts by weight of polyisocyanates.
4. pipeline according to claim 3, wherein the polyether polyol include but is not limited to PTG1000, PTG2000,
One of PCL1000 and PCL2000 or a variety of.
5. pipeline according to claim 1, wherein the composition of raw materials of the material of the thermoplastic polyurethane liner layer are as follows:
100~150 parts by weight of thermoplastic polyurethane elastomer；1~10 parts by weight of wear resistant filler；1~5 parts by weight of remover.
6. pipeline according to claim 5, wherein the hardness 85~95 of the thermoplastic polyurethane elastomer stretches strong
Degree >=25MPa, tearing strength >=70N/mm.
7. pipeline according to claim 5, wherein the wear resistant filler include carbon nanotube, molybdenum disulfide, graphene and
One or more of montmorillonite.
8. pipeline according to claim 1, wherein number of ribs on the outside of the thermoplastic polyurethane liner layer is 4~
16.
9. a kind of method for preparing any one of claim 1~8 abrasion resistant polyurethane double layer innerliner pipeline, this method comprises:
It is the thermoplastic polyurethane liner layer with rib structure by the preparatory extrusion molding of thermoplastic polyurethane material, then this is interior
Lining is placed in steel pipe, and casting type polyurethane material is filled in the annular space of the two, forms casting type polyurethane filled layer, and is obtained
To the abrasion resistant polyurethane double layer innerliner pipeline.
10. any one of the claim 1~8 abrasion resistant polyurethane double layer innerliner pipeline is as petroleum oil-sand and/or metallurgical mine
Application in sand conveyance conduit.
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| CN110735604A (en) * | 2019-09-09 | 2020-01-31 | 建湖县永维阀门钻件有限公司 | Preparation method of corrosion-resistant marine riser |
| CN110903636A (en) * | 2019-12-18 | 2020-03-24 | 万华化学集团股份有限公司 | Polyurethane elastomer and preparation method and application thereof |
| CN113461899A (en) * | 2021-07-19 | 2021-10-01 | 青岛邦皓环境科技有限公司 | Wear-resistant hydrophilic polyurethane and preparation process thereof |
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