CN103350499A - Screw for extruding UHMWPE (Ultra High Molecular Weight PolyEthylene) - Google Patents
Screw for extruding UHMWPE (Ultra High Molecular Weight PolyEthylene) Download PDFInfo
- Publication number
- CN103350499A CN103350499A CN2013103155762A CN201310315576A CN103350499A CN 103350499 A CN103350499 A CN 103350499A CN 2013103155762 A CN2013103155762 A CN 2013103155762A CN 201310315576 A CN201310315576 A CN 201310315576A CN 103350499 A CN103350499 A CN 103350499A
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- CN
- China
- Prior art keywords
- screw
- molecular weight
- uhmwpe
- weight polyethylene
- extruding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a screw for extruding UHMWPE (Ultra High Molecular Weight PolyEthylene), and aims to solve the problems of high viscosity, poor fluidity, and susceptibility to fracture and degradation during the manufacturing process of the UHMWPE. Pins and protective screens are arranged on the screw; the rotary speed and the shearing rate are relatively low (the rotary speed is 1-10 r/min, the shearing rate is 40-400 r/min); the compression ratio of the screw is optimized. The extruder screw provided by the invention has a good mixing effect, and can prevent melt fracture and UHMWPE degradation to prevent material blockage in the screw groove, so as to increase the extruding efficiency of the extruder and the mass of the UHMWPE.
Description
Technical field
The present invention relates to a kind of screw rod of producing ultra-high molecular weight polyethylene.
Background technology
Ultra-high molecular weight polyethylene (Ultra-High Molecular Weight Polyethylene UHMWPE) was at first succeeded in developing with Ziegler catalyst by U.S. Unichem in nineteen fifty-seven.This is a kind of line polymer, molecular weight is usually 1,000,000-5,000,000, degree of crystallinity is 65-85%, density is 0.92-0.96g/cm3, compare with numerous polymeric materials, UHMWPE has the advantages that coefficient of friction is little, abrasion are low, chemical resistance is good, but also has the good characteristics such as shock-resistant, resistance to pressure, frost resistance, heat insulating ability, self lubricity, ant-scaling, stress cracking resistance, wholesomeness.These good characteristics make UHMWPE tubing have important practical value.Be described as " the novel thermoplastic engineering material that is emerging rapidly ", in various fields, have important practical value.
At present, when ultra-high molecular weight polyethylene being produced the plastic products such as various tubing, sheet material, profile shapes as raw material, extrusion by melting and mould forming method have usually been adopted.So-called extrusion by melting refers to: the raw material that enters extruding machine barrel is extruded behind conveying, compacting, the fusion plastification realizing under the effect of screw rod, and the material of extruding enters die for molding again.As everyone knows, the UHMWPE molecular weight is unordered entanglement between the extraordinary strand up to millions of, and its molecule segment shows as melt viscosity up to 108Pa.S to the warm-up movement delay of response.Just because of the molecular weight of UHMWPE is very large, viscosity is high, does not almost have flowability, does not have viscous state, only has rubbery state, so easily cause material to expand in extruder when adopting common screw to extrude, back pressure is very high, can't realize extruding; Critical shear rate is extremely low in addition, and melt fracture easily occurs; Because the coefficient of sliding friction is low, easily skids in the time of charging; Heat release in the extrusion and accumulation of heat are difficult to control, cause macromolecules degradation, so that the molecular weight less than 1,000,000 of goods, cause all premium properties of ultra-high molecular weight polyethylene also to weaken thereupon and disappear, seriously restrict the application of UHMWPE, become the hot subject of material educational circles and industrial circle joint exploration since the eighties.
Summary of the invention
The invention provides a kind of screw rod of extruding ultrahigh molecular weight polyethylene.
For solving the problem that exists in the ultra-high molecular weight polyethylene production process, the technical step that the present invention adopts is: the ultra-high molecular weight polyethylene raw material of molecular weight 〉=2,000,000 is sent in the extruder, pass through successively after conveying, compacting and the heating, realized extruding according to specific technique by extruder.
Pin and barrier head are set on the above-mentioned extruder screw, thereby material is cut apart, converged with mixing, make the material in the screw channel even.
Above-mentioned screw speed is that 1-10 turns/min, and shear rate is that 40-400 turns/min, because both are all lower, the ultra-high molecular weight polyethylene that can avoid melt fracture to cause can not moulding.
Compression ratio to above-mentioned screw rod has adopted optimization process, can prevent that material from stopping up in screw channel and cause machine barrel to burst.
The specific embodiment
The screw rod of a kind of extruding ultrahigh molecular weight polyethylene of the present invention the steps include: the ultra-high molecular weight polyethylene raw material of molecular weight 〉=2,000,000 is sent in the extruder, passes through successively after conveying, compacting and the heating, is extruded by extruder.At screw rod pin and barrier head are set, keeping screw speed in the extrusion is that 1-10 turns/min, and shear rate is that 40-400 turns/min, and has optimized the compression ratio of screw rod.
The present invention arranges pin and barrier head at screw rod, can cut apart material, converge with mixing, makes the material in the screw channel even; Lower screw speed and shear rate can prevent melt fracture, avoid the degraded of ultra-high molecular weight polyethylene, thereby improve its Forming Quality; The screw compression ratio of optimizing can prevent that material from stopping up and cause machine barrel to burst in screw channel.
Claims (3)
1. the screw rod of claim 1 extruding ultrahigh molecular weight polyethylene is characterized in that: pin and barrier head are set on the described screw rod.
2. the screw rod of claim 2 a kind of extruding ultrahigh molecular weight polyethylene according to claim 1, it is characterized in that: described screw speed is that 1-10 turns/min, shear rate is that 40-400 turns/min.
3. claim 3 is characterized in that according to the screw rod of claims 1 described a kind of extruding ultrahigh molecular weight polyethylene: described screw compression ratio is optimized processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103155762A CN103350499A (en) | 2013-07-25 | 2013-07-25 | Screw for extruding UHMWPE (Ultra High Molecular Weight PolyEthylene) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103155762A CN103350499A (en) | 2013-07-25 | 2013-07-25 | Screw for extruding UHMWPE (Ultra High Molecular Weight PolyEthylene) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103350499A true CN103350499A (en) | 2013-10-16 |
Family
ID=49306958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103155762A Pending CN103350499A (en) | 2013-07-25 | 2013-07-25 | Screw for extruding UHMWPE (Ultra High Molecular Weight PolyEthylene) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103350499A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105061806A (en) * | 2015-07-22 | 2015-11-18 | 浦江县金鑫废旧物资回收有限公司 | Recovery process of ultra-high molecular weight polyethylene waste |
-
2013
- 2013-07-25 CN CN2013103155762A patent/CN103350499A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105061806A (en) * | 2015-07-22 | 2015-11-18 | 浦江县金鑫废旧物资回收有限公司 | Recovery process of ultra-high molecular weight polyethylene waste |
| CN105061806B (en) * | 2015-07-22 | 2017-12-22 | 浦江县金鑫废旧物资回收有限公司 | A kind of recovery process of ultra-high molecular weight polyethylene discarded object |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131016 |