CN110901005A - Oxygen-blocking and scale-preventing composite pipe and preparation method thereof - Google Patents
Oxygen-blocking and scale-preventing composite pipe and preparation method thereof Download PDFInfo
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- CN110901005A CN110901005A CN201911063814.9A CN201911063814A CN110901005A CN 110901005 A CN110901005 A CN 110901005A CN 201911063814 A CN201911063814 A CN 201911063814A CN 110901005 A CN110901005 A CN 110901005A
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- oxygen
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- hydrophobic
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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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
- F16L9/12—Rigid pipes of plastics with or without reinforcement
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- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- 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
- B29L2009/00—Layered products
-
- 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
Abstract
The invention provides an oxygen-blocking and scale-preventing composite pipe and a preparation method thereof, and belongs to the technical field of pipes. The oxygen-blocking and scale-preventing composite pipe has a structure with 5 layers, and is sequentially provided with an ultra-hydrophobic layer, an adhesive layer A, an oxygen-blocking layer, an adhesive layer B and a protective layer from inside to outside, wherein the material of the ultra-hydrophobic layer comprises heat-resistant polyethylene and an ultra-hydrophobic auxiliary agent, and the oxygen permeability of the pipe is reduced, the scaling of the inner wall of the pipe is prevented, and the safety, the heating efficiency and the economy of a floor heating system are improved.
Description
Technical Field
The invention belongs to the technical field of pipes, and relates to an oxygen-resistant and anti-scaling composite pipe and a preparation method thereof.
Background
With the progress and development of society, the heating mode has been gradually changed from the heating by radiating fins to the underground heating. The ground heating pipe is a pipe used as a circulating flow carrier of low-temperature hot water in a low-temperature hot water ground radiation heating system, and is increasingly widely used in recent years, and the pipe itself is required to have good mechanical property, high temperature resistance and low temperature resistance in order to enable the low-temperature hot water to better circulate. Heat resistant Polyethylene (PERT) tubing is currently an ideal product for use as floor heating pipe worldwide.
However, the heat-resistant polyethylene pipe has some defects in daily use, which mainly appear in two aspects: on one hand, the oxygen permeability exists, and the oxygen content in the hot water pipe is increased along with the rise of the temperature, so that the metal pipe fittings in the system are corroded, and microorganisms are propagated in a large quantity, so that a layer of biological slime is generated on the inner wall of the pipe, and the water flow and the heat exchange efficiency are influenced; on the other hand is that ground heating coil often can the scale deposit on the pipeline inner wall after long-time the use, and the time along with the pipeline use increases intraductal flow area and constantly diminishes, has influenced the discharge and the heat exchange efficiency of system, causes pipe-line system's jam even, consequently need carry out periodic cleaning to the pipeline inner wall, not only wastes time and energy, washs improper fracture that can also cause the pipeline, and the loss is serious.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide an oxygen-blocking and scale-preventing composite pipe and a preparation method thereof, so as to improve the safety, heating efficiency and economy of a floor heating system.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the invention provides an oxygen-blocking and scale-preventing composite pipe which has a 5-layer structure and comprises a super-hydrophobic layer, an adhesive layer A, an oxygen-blocking layer, an adhesive layer B and a protective layer in sequence from inside to outside, wherein the super-hydrophobic layer is made of heat-resistant polyethylene and a super-hydrophobic auxiliary agent. The hydrophobic property of the super-hydrophobic layer is improved by adopting the super-hydrophobic auxiliary agent; by introducing the oxygen-resistant layer and the super-hydrophobic layer simultaneously, the oxygen permeability of the pipe is reduced, and the scaling of the inner wall of the pipeline is prevented.
As a preferred embodiment of the oxygen-resistant and anti-scaling composite pipe, the super-hydrophobic auxiliary agent is prepared by taking heat-resistant polyethylene as a matrix and has the surface energy of 20J/m2The following resins.
As a preferred embodiment of the oxygen-resistant and anti-scaling composite pipe, the surface energy is 20J/m2The following substances are fluorine and/or organosilicon; as a more preferable embodiment of the oxygen-blocking and scale-preventing composite pipe, the super-hydrophobic auxiliary agent is at least one of polyvinyl fluoride, polyvinylidene fluoride and polydimethylsiloxane with the molecular weight of 10-30 ten thousand.
As a preferable embodiment of the oxygen-resistant and scale-resistant composite pipe, in the material of the super-hydrophobic layer, the weight ratio of the heat-resistant polyethylene to the super-hydrophobic auxiliary agent is 100: 1-10.
As a preferable embodiment of the oxygen-resistant and anti-scale composite pipe, the material of the super-hydrophobic layer further comprises color master.
As a more preferable embodiment of the oxygen-resistant and anti-scaling composite pipe of the invention, in the material of the super-hydrophobic layer, the weight ratio of the heat-resistant polyethylene to the color master is 100: 1-2.
As a preferred embodiment of the oxygen-barrier and anti-fouling composite pipe of the present invention, the material of the oxygen-barrier layer is EVOH.
As a preferred embodiment of the oxygen-blocking and scale-preventing composite pipe of the present invention, the materials of the adhesive layer a and the adhesive layer B are both hot melt adhesives.
As a preferable embodiment of the oxygen-resistant and scale-resistant composite pipe, the material of the protective layer is heat-resistant polyethylene or a mixture of heat-resistant polyethylene and color master.
As a more preferable embodiment of the oxygen-resistant and anti-scaling composite pipe of the present invention, in the material of the protective layer, the weight ratio of the heat-resistant polyethylene to the color master is 100: 2.
As a preferable embodiment of the oxygen-resistant and anti-scaling composite pipe, the thickness of the adhesive layer A and the adhesive layer B is 0.04-0.15mm, and the thickness of the oxygen-resistant layer is 0.04-0.15 mm.
The protective layer and the super-hydrophobic layer are pressure bearing layers and accord with corresponding standards.
In a second aspect, the invention also provides a preparation method of the oxygen-resistant and anti-scaling composite pipe, which adopts a five-layer co-extrusion technology and comprises the following steps: simultaneously extruding a mixture of heat-resistant polyethylene and a super-hydrophobic auxiliary agent or a mixture of heat-resistant polyethylene, the super-hydrophobic auxiliary agent and color master through a first double-screw extruder to form a super-hydrophobic layer, extruding a hot melt adhesive through a second double-screw extruder to coat an adhesive layer A on the outer wall of the super-hydrophobic layer, extruding an oxygen retardant agent through a third double-screw extruder to coat the oxygen retardant layer on the outer wall of the adhesive layer A, extruding the hot melt adhesive through a fourth double-screw extruder to coat an adhesive layer B on the outer wall of the oxygen retardant layer, and extruding a mixture of heat-resistant polyethylene and color master or heat-resistant polyethylene through a fifth double-screw extruder to coat a protective layer on the outer wall of the adhesive layer B; and then sequentially carrying out vacuum sizing, cooling and shaping to obtain the oxygen-blocking and scale-preventing composite pipe.
As a preferred embodiment of the preparation method of the invention, the extrusion temperature of the super-hydrophobic layer is 190-210 ℃, the extrusion temperatures of the adhesive layer A, the oxygen barrier layer and the adhesive layer B are 195-220 ℃, and the extrusion temperature of the protective layer is 195-210 ℃.
Compared with the prior art, the invention has the following advantages and beneficial effects: according to the invention, by introducing the oxygen-blocking layer and the super-hydrophobic auxiliary agent, the oxygen permeability of the pipe is reduced, the scaling of the inner wall of the pipeline is prevented, and the safety, the heating efficiency and the economy of the floor heating system are improved.
Drawings
FIG. 1 is a perspective view of the oxygen-barrier scale-preventive composite pipe of the present invention;
FIG. 2 is a cross-sectional view of the oxygen-blocking and scale-preventing composite pipe of the present invention;
the notation in the figure is: 1-an ultra-hydrophobic layer; 2-an adhesive layer; 3-an oxygen barrier layer; 4-an adhesive layer; 5-protective layer.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
An embodiment of the oxygen-blocking and anti-scaling composite pipe of the present invention is shown in fig. 1, and the structure of the oxygen-blocking and anti-scaling composite pipe has 5 layers with the same length, and comprises, from inside to outside, a super-hydrophobic layer 1, an adhesive layer 2, an oxygen-blocking layer 3, an adhesive layer 4 and a protective layer 5, wherein the super-hydrophobic layer 1 is made of the following materials in parts by weight: 100 parts of heat-resistant polyethylene, 1 part of super-hydrophobic auxiliary agent and 2 parts of color master batch; the adhesive layer 2 and the adhesive layer 4 are both made of hot melt adhesive, and the protective layer 5 is made of the following materials in parts by weight: 100 parts of heat-resistant polyethylene and 2 parts of color master batch; the thicknesses of the adhesive layer 2, the oxygen barrier layer 3 and the adhesive layer 4 are all 0.04 mm-0.15 mm. The preparation method of the oxygen-resistant and anti-scaling composite pipe comprises the following steps: meanwhile, extruding a mixture of heat-resistant polyethylene, a super-hydrophobic auxiliary agent and color master through a first twin-screw extruder to form a super-hydrophobic layer 1, extruding a hot melt adhesive through a second twin-screw extruder to form an adhesive layer 2 coated on the outer wall of the super-hydrophobic layer 1, extruding an oxygen retardant through a third twin-screw extruder to form an oxygen retardant layer 3 coated on the outer wall of the adhesive layer 2, extruding the hot melt adhesive through a fourth twin-screw extruder to form an adhesive layer 4 coated on the outer wall of the oxygen retardant layer 3, and extruding a mixture of heat-resistant polyethylene and color master through a fifth twin-screw extruder to form a protective layer 5 coated on the outer wall of the adhesive layer 4; and then sequentially carrying out vacuum sizing, cooling and shaping to obtain the oxygen-resistant and anti-scaling composite pipe.
Example 2
An embodiment of the oxygen-blocking and anti-scaling composite pipe of the present invention is shown in fig. 1, and the structure of the oxygen-blocking and anti-scaling composite pipe has 5 layers with the same length, and comprises, from inside to outside, a super-hydrophobic layer 1, an adhesive layer 2, an oxygen-blocking layer 3, an adhesive layer 4 and a protective layer 5, wherein the super-hydrophobic layer 1 is made of the following materials in parts by weight: 100 parts of heat-resistant polyethylene, 2 parts of super-hydrophobic auxiliary agent and 2 parts of color master batch; the adhesive layer 2 and the adhesive layer 4 are both made of hot melt adhesive, and the protective layer 5 is made of the following materials in parts by weight: 100 parts of heat-resistant polyethylene and 2 parts of color master batch; the thicknesses of the adhesive layer 2, the oxygen barrier layer 3 and the adhesive layer 4 are all 0.04 mm-0.15 mm. The preparation method of the oxygen-resistant and scale-proof composite pipe is the same as that of the embodiment 1.
Example 3
An embodiment of the oxygen-blocking and anti-scaling composite pipe of the present invention is shown in fig. 1, and the structure of the oxygen-blocking and anti-scaling composite pipe has 5 layers with the same length, and comprises, from inside to outside, a super-hydrophobic layer 1, an adhesive layer 2, an oxygen-blocking layer 3, an adhesive layer 4 and a protective layer 5, wherein the super-hydrophobic layer 1 is made of the following materials in parts by weight: 100 parts of heat-resistant polyethylene, 5 parts of super-hydrophobic auxiliary agent and 2 parts of color master batch; the adhesive layer 2 and the adhesive layer 4 are both made of hot melt adhesive, and the protective layer 5 is made of the following materials in parts by weight: 100 parts of heat-resistant polyethylene and 2 parts of color master batch; the thicknesses of the adhesive layer 2, the oxygen barrier layer 3 and the adhesive layer 4 are all 0.04 mm-0.15 mm. The preparation method of the oxygen-resistant and scale-proof composite pipe is the same as that of the embodiment 1.
Example 4
An embodiment of the oxygen-blocking and anti-scaling composite pipe of the present invention is shown in fig. 1, and the structure of the oxygen-blocking and anti-scaling composite pipe has 5 layers with the same length, and comprises, from inside to outside, a super-hydrophobic layer 1, an adhesive layer 2, an oxygen-blocking layer 3, an adhesive layer 4 and a protective layer 5, wherein the super-hydrophobic layer 1 is made of the following materials in parts by weight: 100 parts of heat-resistant polyethylene, 10 parts of super-hydrophobic auxiliary agent and 2 parts of color master batch; the adhesive layer 2 and the adhesive layer 4 are both made of hot melt adhesive, and the protective layer 5 is made of the following materials in parts by weight: 100 parts of heat-resistant polyethylene and 2 parts of color master batch; the thicknesses of the adhesive layer 2, the oxygen barrier layer 3 and the adhesive layer 4 are all 0.04 mm-0.15 mm. The preparation method of the oxygen-resistant and scale-proof composite pipe is the same as that of the embodiment 1.
The superhydrophobic aids of examples 1-5 are each at least one of PVF (polyvinyl fluoride), PVDF (polyvinylidene fluoride), and polydimethylsiloxane having a molecular weight of 10-30 ten thousand.
Comparative example
The comparative example is a single layer tube made from the following materials in parts by weight: 100 parts of heat-resistant polyethylene and 2 parts of color master batch.
Examples of effects
The pipes of examples 1-5 and comparative example were subjected to performance tests, the results of which are shown in table 1.
TABLE 1 pipe Performance test results
Note: the standard of oxygen permeability refers to ISO17455, the standard of hydrophobic property refers to GB/T30693-2014, and the standard of hydrostatic pressure refers to GB/T6111-2003.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. An oxygen-resistant and scale-resistant composite pipe is characterized in that: the oxygen-resistant and anti-scaling composite pipe has a 5-layer structure and sequentially comprises a super-hydrophobic layer, an adhesive layer A, an oxygen-resistant layer, an adhesive layer B and a protective layer from inside to outside, wherein the super-hydrophobic layer is made of heat-resistant polyethylene and a super-hydrophobic auxiliary agent.
2. The oxygen-resistant and anti-scaling composite pipe as claimed in claim 1, wherein the super-hydrophobic auxiliary agent is heat-resistant polyethylene as a matrix and has a surface energy of 20J/m2The following resins.
3. The oxygen-barrier, anti-fouling composite pipe of claim 2, wherein the surface energy is at 20J/m2The following substances are fluorine and/or silicone.
4. The oxygen-blocking and scale-preventing composite pipe according to claim 3, wherein the super-hydrophobic auxiliary agent is at least one of polyvinyl fluoride, polyvinylidene fluoride and polydimethylsiloxane with a molecular weight of 10-30 ten thousand.
5. The oxygen-barrier and scale-proof composite pipe according to claim 1, wherein: in the material of the super-hydrophobic layer, the weight ratio of the heat-resistant polyethylene to the super-hydrophobic auxiliary agent is 100: 1-10.
6. The oxygen-resistant and scale-resistant composite pipe as claimed in claim 1, wherein the material of the super-hydrophobic layer further comprises color masterbatch; in the material of the super-hydrophobic layer, the weight ratio of the heat-resistant polyethylene to the color master is 100: 1-2.
7. The oxygen-resistant and scale-resistant composite pipe according to claim 1, wherein the material of the oxygen-resistant layer is EVOH, the materials of the adhesive layer A and the adhesive layer B are hot melt adhesives, and the material of the protective layer is heat-resistant polyethylene or a mixture of heat-resistant polyethylene and color masterbatch.
8. The oxygen-barrier scale-control composite pipe as claimed in claim 1, wherein the thickness of the adhesive layer a and the adhesive layer B is 0.04-0.15mm, and the thickness of the oxygen-barrier layer is 0.04-0.15 mm.
9. A method for preparing the oxygen-resistant and anti-scaling composite pipe as claimed in any one of claims 1 to 8, wherein the preparation method adopts a five-layer co-extrusion technology, and comprises the following steps: simultaneously extruding a mixture of heat-resistant polyethylene and a super-hydrophobic auxiliary agent or a mixture of heat-resistant polyethylene, the super-hydrophobic auxiliary agent and color master through a first double-screw extruder to form a super-hydrophobic layer, extruding a hot melt adhesive through a second double-screw extruder to coat an adhesive layer A on the outer wall of the super-hydrophobic layer, extruding an oxygen retardant agent through a third double-screw extruder to coat the oxygen retardant layer on the outer wall of the adhesive layer A, extruding the hot melt adhesive through a fourth double-screw extruder to coat an adhesive layer B on the outer wall of the oxygen retardant layer, and extruding a mixture of heat-resistant polyethylene and color master or heat-resistant polyethylene through a fifth double-screw extruder to coat a protective layer on the outer wall of the adhesive layer B; and then sequentially carrying out vacuum sizing, cooling and shaping to obtain the oxygen-blocking and scale-preventing composite pipe.
10. The method as claimed in claim 9, wherein the extrusion temperature of the super-hydrophobic layer is 190-210 ℃, the extrusion temperatures of the adhesive layer A, the oxygen barrier layer and the adhesive layer B are 195-220 ℃, and the extrusion temperature of the protective layer is 195-210 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911063814.9A CN110901005B (en) | 2019-11-01 | 2019-11-01 | Oxygen-blocking and scale-preventing composite pipe and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911063814.9A CN110901005B (en) | 2019-11-01 | 2019-11-01 | Oxygen-blocking and scale-preventing composite pipe and preparation method thereof |
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| CN110901005A true CN110901005A (en) | 2020-03-24 |
| CN110901005B CN110901005B (en) | 2022-05-13 |
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Cited By (1)
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|---|---|---|---|---|
| CN109424798A (en) * | 2017-08-23 | 2019-03-05 | 山东品源管业有限公司 | A kind of outer black interior white type polyethylene solid-wall pipe |
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| CN110901005B (en) | 2022-05-13 |
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