KR101664271B1 - Polyethylene Powder for steel pipe coating manufacturing methods and polyethylene powder manufactured by someone - Google Patents

Polyethylene Powder for steel pipe coating manufacturing methods and polyethylene powder manufactured by someone Download PDF

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Publication number
KR101664271B1
KR101664271B1 KR1020150068037A KR20150068037A KR101664271B1 KR 101664271 B1 KR101664271 B1 KR 101664271B1 KR 1020150068037 A KR1020150068037 A KR 1020150068037A KR 20150068037 A KR20150068037 A KR 20150068037A KR 101664271 B1 KR101664271 B1 KR 101664271B1
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South Korea
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polyethylene powder
steel pipe
particle size
powder
polyethylene
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KR1020150068037A
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Korean (ko)
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류성걸
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류성걸
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • C08G2150/00—Compositions for coatings
    • C08G2150/20—Compositions for powder coatings

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

A polyethylene powder for manufacturing a steel pipe, a polyethylene powder produced by the method, and a coated steel pipe using the same.
Among them, the method for producing a polyethylene powder for coating a steel pipe comprises the steps of obtaining a polyethylene powder for coating a steel pipe of a reference particle size through an extrusion process, a cooling process, a cutting process, a pulverizing process and a sorting process after a blending process of blending polyethylene granules and a master batch Wherein the sorting step selects each of a first polyethylene powder having a reference particle size, a second polyethylene powder having a larger particle size than the reference particle size and a third particle powder having a smaller particle size than the reference particle size, Returning to an extrusion step or a grinding step, and the third polyethylene powder is returned to the compounding step or the extrusion step.

Description

TECHNICAL FIELD The present invention relates to a method for producing a polyethylene powder for coating a steel pipe and a method for producing the same,

The present invention relates to a method for producing a polyethylene powder for coating steel pipes and a polyethylene powder produced by the method.

Particularly, in the process of sorting polyethylene powder for steel pipe coating into a prescribed size, powder having a size smaller than a prescribed size, that is, fine powder is separately collected and recycled by an extrusion process, thereby increasing a recycling rate and preventing scattering So that the working environment can be improved.

Steel pipes, especially steel pipes such as water and sewage pipes buried in the underground, form corrosion films on the inner and outer surfaces to prevent corrosion. Such coatings are coated with a conventional paint or formed with a thermoplastic resin. Generally, when a steel pipe used for a water supply and drainage pipe is coated with a paint to form a film, a coating film is lost due to a reactive component contained in the water or sewage, and the steel pipe itself is easily corroded. Therefore, a polyolefin- And is covered with a polyethylene film.

Particularly, in the process of producing polyethylene powder used as a steel pipe covering material, polyethylene pellets are produced by extruding a granular polyethylene powder at high temperature, cooling it, and cutting it to a predetermined size.

The polyethylene pellets are pulverized and pulverized by a pulverizing unit such as a disk mill or a hammer mill, and only a polyethylene powder having a particle size specified by a sorter is selected and packed. Powders larger than the prescribed size are re-pulverized.

As shown in FIG. 1, a circular discriminator (vibrator) 10 for sorting polyethylene powder by size is provided with a mesh net 11 inside thereof. The powder passing through the mesh net 11 is packaged and shipped. The powder of large particles that have not passed through is collected separately and sent to the grinding process, where it is subjected to a re-grinding process.

However, since the powder passing through the mesh net 11 includes powder of very small particles, there is a problem that it is scattered during the steel pipe covering work.

2, the large-sized powder container 20 is filled with polyethylene powder P and the steel pipe 1 clogged at both ends heated to 280 to 300 ° C is filled with the polyethylene powder P, The polyethylene powder P is melted by the hot steel pipe 1 and is coated on the surface of the steel pipe.

At this time, air is injected from the lower part of the powder container 20 into the blower to allow the polyethylene powder P to float for good covering. In this process, the polyethylene powder P is scattered and the periphery is contaminated, Thereby adversely affecting the health of the operator, and the raw material loss is also caused by the scattered fine polyethylene powder.

In addition, there is a problem that the fine polyethylene powder scattered adheres to the surface of the coating layer, adversely affecting the quality of the product. Therefore, there is a demand for a solution to the processing problem of fine polyethylene powder.

Patent Document 1: Registration Utility Model No. 20-0180388 Patent Document 2: JP-A-10-1237741

An object of the present invention is to provide a method for manufacturing a polyethylene powder for coating a steel pipe, in which fine powder having a particle size smaller than a specified particle size is collected and recycled by an extrusion process.

Another object of the present invention is to provide a polyethylene powder for covering a steel pipe, which is produced by the method for producing a polyethylene powder for covering a steel pipe.

The above object is achieved by a method for obtaining a polyethylene powder for coating a steel pipe of a reference particle size through an extrusion process, a cooling process, a cutting process, a pulverizing process and a selection process after a blending process of blending polyethylene granules and a master batch, The process comprises the steps of: selecting a first polyethylene powder having a reference particle size, a second polyethylene powder having a larger particle size than the reference particle size, and a third particle powder having a smaller particle size than the reference particle size, and the second polyethylene powder is subjected to the mixing process, And returning the third polyethylene powder to the compounding step or the extrusion step. The method for producing a polyethylene powder for covering a steel pipe according to claim 1,

Here, it is preferable that the second polyethylene powder is returned to the pulverizing step and the third polyethylene powder is returned to the extruding step.

The coating of the steel pipe is carried out so that the first polyethylene powder is filled in the powder container and the heated steel pipe is partially immersed in the first polyethylene powder and rotated so that the first polyethylene powder is fused and coated on the surface of the steel pipe. And injecting air into the lower part of the powder can by a blower to cause the first polyethylene powder to float toward the steel pipe.

The vibrator may include a first mesh network of 24 to 32 meshes for sorting the second polyethylene powder into the vibrator, and a second mesh network installed at a lower portion of the first mesh network And a second mesh network of 60 to 75 meshes for sorting the first polyethylene powder.

The fine third polyethylene powder that has passed through the second mesh net of the vibrator may be transferred to a transfer unit by an air blower and may be introduced into the hopper of the extruder for the extrusion process in the transfer unit.

The transfer unit may include a cyclone body having the third polyethylene powder introduced therein through an inlet formed in a tangential direction of the outer circumferential surface to be moved downward while being rotated along an inner circumferential surface of the cyclone body; An air discharge pipe provided at the upper center of the cyclone body for discharging the air in the internal space to the outside; And a discharge port for collecting and discharging the third polyethylene powder moved to the lower portion of the cyclone body.

The object of the present invention is also achieved by a process for producing a polyethylene powder for coating a steel pipe of a reference grain size through an extrusion process, a cooling process, a cutting process, a pulverizing process and a sorting process after a blending process of blending polyethylene granules with a master batch, The second polyethylene powder having a standard particle size, the second polyethylene powder having a larger particle size than the reference particle size and the third particle powder having a smaller particle size than the reference particle size are respectively selected and the second polyethylene powder is returned to the compounding step, And the third polyethylene powder is returned to the mixing process or the extrusion process, wherein the sorting process is performed by a vibrator, wherein the vibrator has a 24 to 32 mesh (mesh) mesh for sorting the second polyethylene powder therein, And a second mesh network provided at a lower portion of the first mesh network, A steel pipe coating polyethylene powder obtained by a steel pipe 60 to the coating of polyethylene powder production process 75 comprising a second mesh net of a mesh (mesh) for sorting the ethylene powder,
And a polyethylene powder for covering a steel pipe to be selectively collected on the second mesh net.

In the process of sorting the polyethylene powder for steel pipe coating into a specified size, the fine powder smaller than the specified size is separately collected and recycled by the extrusion process, thereby increasing the recycling rate of the material and scattering the powder during the coating operation It is possible to prevent the pollution of the workplace and protect the health of the worker.

In addition, the problem of adhering adhering fine micro polyethylene powder to the surface of the coating layer or foreign matter in the air adhering to the surface of the coating layer adversely affects the quality of the product can be solved.

Fig. 1 is a view showing the structure of a separator for a conventional polyethylene powder
Fig. 2 is a state diagram in which a steel pipe is covered with a polyethylene powder
3 is a flowchart of a steel pipe covering process according to the present invention
Fig. 4 is a schematic view of a separator (vibrator) for steel pipe covering process according to the present invention
5 is a detailed configuration diagram of a transfer unit for a fine polyethylene powder according to the present invention

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

3 is a flowchart of a steel pipe covering process according to the present invention.

3, the method for producing a polyethylene powder for covering a steel pipe according to the present invention comprises a mixing step (S10) of blending polyethylene granules with a master batch, an extrusion step (S20) of extruding the mixture at a high temperature, A cooling step (S30) for curing the extrudate of the polyethylene pellets, a cutting step (S40) for cutting the hardened long type polyethylene into a pellet shape, a pulverizing step (S50) for pulverizing the polyethylene pellets, and a pulverized polyethylene powder (S60) for sorting the polyethylene powder having the standard particle size.

Particularly, in the sorting step of the present invention, it is difficult to obtain a powder having uniform particle size during the pulverizing step. Therefore, it is preferable that the pulverized polyethylene powder be a first polyethylene powder which is a reference particle size, a second polyethylene powder which is larger than a reference particle size, Lt; RTI ID = 0.0 > polyethylene < / RTI >

Here, the first polyethylene powder as the reference particle size can be shipped immediately, and the second polyethylene powder larger than the reference particle size can be returned to the pulverizing process for re-pulverization. Further, the fine third polyethylene powder smaller than the reference particle size can be trapped and returned to the extrusion process.

Alternatively, the second polyethylene powder may be returned to the blending process or the extrusion process, not the pulverization process, and the third polyethylene powder may be returned to the blending process rather than the extrusion process.

However, since such a method may lead to an increase in power cost and a decrease in productivity, it is more reasonable to return the second polyethylene powder to the pulverizing step and the third polyethylene powder to the extrusion step as described above.

Fig. 4 is a configuration diagram of a separator (a vibrator) for a steel pipe covering process according to the present invention.

The separator (or vibrator) 100 shown in FIG. 4 is a sorter designed specifically for the sorting process of the present invention. The sorter 100 includes a first mesh net 110 for filtering the second polyethylene powder P 2 , And a second mesh net 120 for filtering the first polyethylene powder P 1 is installed at a lower portion thereof.

The second polyethylene powder P 2 collected in the first mesh net 110 is transferred to the crushing process through the dedicated outlet 111 and the first polyethylene powder P 2 collected in the second mesh net 120 1 is conveyed to the packaging process through the dedicated outlet 121. [

Here, the first mesh network 110 is 24 to 32 meshes, and the second mesh network 120 is 60 to 75 meshes.

The reason why the mesh of the first mesh net 110 is set to 24 to 32 is that if the numerical value is smaller than 24, the polyethylene powder having a particle size larger than the desired size is collected and not melted during the coating operation, It is necessary to breathe air very firmly. In this case, there is a problem that other polyethylene powder having a small particle size is scattered. When the value is larger than 32, the production amount is decreased, .

The reason why the mesh of the second mesh 120 is set to 60 to 75 is that when the numerical value is smaller than 60, the amount of the powder having a fine particle size fed to the extruder through the second mesh 120 is increased It is preferable to set the mesh in the above range because the polyethylene powder having a particle size smaller than the desired size may be collected and scattered during the coating operation may occur if the numerical value is larger than 75 Do.

Meanwhile, the third polyethylene powder P 3 having a fine particle size passed through the second mesh net 120 is transferred to a hopper (not shown) of the extruder for the extrusion process. Here, the means for transferring the third polyethylene powder (P 3 ) to the hopper is the blower 200 and the transfer unit 300.

The transfer unit 300 may be a cyclone transfer unit, for example, as shown in FIG. The cyclone-type transfer unit includes a cyclone body 310 for moving the third polyethylene powder P 3 introduced into the interior of the cyclone-type transfer unit through an inlet 311 formed in the tangential direction of the outer circumferential surface, An air discharge pipe 320 provided on the upper center of the cyclone body 310 to discharge air in the internal space to the outside; And a discharge port 330 provided at a lower portion of the cyclone body 310 for collecting and discharging the third polyethylene powder P 3 which is moved to the lower portion of the cyclone body 310, And is associated with the hopper of one extruder.

Meanwhile, the process of covering the steel pipe 1 using the prescribed polyethylene powder obtained through the above process is shown in FIG. 2 and has already been described in the background art, so a detailed description will be omitted.

However, when the steel pipe 1 is coated with the polyethylene powder obtained by the method of the present invention, no polyethylene powder with a fine particle size is included, so that even if air is injected into the lower portion of the powder container 20 by the blower, This can protect the health of the operator and reduce the loss of raw material as the raw material is not scattered and the quality of the product can be improved by not attaching fine fines and foreign matter on the surface of the cloth .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

100: selector 110: first mesh network
120: second mesh network 200: blower
300: transfer unit 310: cyclone body
320: air discharge pipe 330: discharge port

Claims (7)

A method for obtaining a polyethylene powder for coating a steel pipe having a standard particle size through an extrusion process, a cooling process, a cutting process, a pulverizing process and a selection process after a blending process of blending polyethylene granules and a master batch,
Wherein the sorting step selects each of the first polyethylene powder of the reference particle size, the second polyethylene powder larger than the reference particle size, and the third polyethylene powder smaller than the reference particle size, and the second polyethylene powder is subjected to the mixing process, And returning the third polyethylene powder to the mixing process or the extrusion process. The method for producing a polyethylene powder for covering a steel pipe according to claim 1,
The method according to claim 1,
Wherein the second polyethylene powder is returned to the pulverizing step and the third polyethylene powder is returned to the extruding step.
The method according to claim 1,
The covering of the steel pipe is,
The first polyethylene powder is filled in the powder container, the heated steel pipe is partially immersed in the first polyethylene powder, and the first polyethylene powder is fused and coated on the surface of the heated steel pipe by rotation,
And injecting air into the lower portion of the powder container by a blower to cause the first polyethylene powder to float toward the steel pipe.
The method according to claim 1,
Wherein the vibrator includes a first mesh net of 24 to 32 meshes for sorting the second polyethylene powder therein, and a second mesh net installed at a lower portion of the first mesh net, 1. A method for manufacturing a polyethylene powder for covering a steel pipe, the method comprising: a second mesh net having a mesh size of 60 to 75 to select a polyethylene powder.
The method of claim 4,
Wherein the fine third polyethylene powder that has passed through the second mesh net of the vibrator is fed to a feed unit by a blower and is fed into a hopper of an extruder for the extrusion process in the feed unit.
The method of claim 5,
The transfer unit
The third polyethylene powder flowing inwardly through the inlet formed in the tangential direction of the outer circumferential surface moves downward while being rotated along the inner circumferential surface;
An air discharge pipe provided at the upper center of the cyclone body for discharging the air in the internal space to the outside; And
And a discharge port for collecting and discharging the third polyethylene powder moved to the lower portion of the cyclone body.
A polyethylene powder for coating a steel pipe having a standard particle size is obtained through an extrusion process, a cooling process, a cutting process, a pulverizing process and a sorting process after a blending process of blending polyethylene granules and a master batch,
Wherein the sorting step selects each of the first polyethylene powder of the reference particle size, the second polyethylene powder larger than the reference particle size, and the third polyethylene powder smaller than the reference particle size, and the second polyethylene powder is subjected to the mixing process, And returning the third polyethylene powder to the compounding or extrusion process,
Wherein the vibrator includes a first mesh net of 24 to 32 meshes for sorting the second polyethylene powder therein, and a second mesh net installed at a lower portion of the first mesh net, 1. A polyethylene powder for covering a steel pipe obtained by a method for producing a polyethylene powder for coating a steel pipe comprising a second mesh net of 60 to 75 mesh for sorting polyethylene powder,
Wherein the polyethylene powder is selectively collected at the upper portion of the second mesh net.
KR1020150068037A 2015-05-15 2015-05-15 Polyethylene Powder for steel pipe coating manufacturing methods and polyethylene powder manufactured by someone KR101664271B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH086290A (en) * 1994-06-20 1996-01-12 Mitsubishi Chem Corp Production of toner for developing electrostatic charge image
JPH08134287A (en) * 1994-09-13 1996-05-28 Ube Ind Ltd Composition for coating steel pipe
KR200180388Y1 (en) 1999-11-17 2000-05-01 주식회사동국산업 Apparatus for coating the steel pipe with polyethylene powder
KR101237741B1 (en) 2010-06-30 2013-02-26 주식회사 투에이취켐 Highly flowalbe and flame-retardant modified polyethylene resin composition for metal coating, modified polyethylene powder for metal coating, and mehtod of manufacturing the same
KR20130075935A (en) * 2011-12-28 2013-07-08 주식회사 한국켄트메타스 Coating method and that commodity of waterworks materials and product

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH086290A (en) * 1994-06-20 1996-01-12 Mitsubishi Chem Corp Production of toner for developing electrostatic charge image
JPH08134287A (en) * 1994-09-13 1996-05-28 Ube Ind Ltd Composition for coating steel pipe
KR200180388Y1 (en) 1999-11-17 2000-05-01 주식회사동국산업 Apparatus for coating the steel pipe with polyethylene powder
KR101237741B1 (en) 2010-06-30 2013-02-26 주식회사 투에이취켐 Highly flowalbe and flame-retardant modified polyethylene resin composition for metal coating, modified polyethylene powder for metal coating, and mehtod of manufacturing the same
KR20130075935A (en) * 2011-12-28 2013-07-08 주식회사 한국켄트메타스 Coating method and that commodity of waterworks materials and product

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