CN101259748A - Method for preparing large-diameter pipe from super-high molecular weight polyethylene material - Google Patents
Method for preparing large-diameter pipe from super-high molecular weight polyethylene material Download PDFInfo
- Publication number
- CN101259748A CN101259748A CNA2007100201744A CN200710020174A CN101259748A CN 101259748 A CN101259748 A CN 101259748A CN A2007100201744 A CNA2007100201744 A CN A2007100201744A CN 200710020174 A CN200710020174 A CN 200710020174A CN 101259748 A CN101259748 A CN 101259748A
- Authority
- CN
- China
- Prior art keywords
- molecular weight
- weight polyethylene
- high molecular
- uhmwpe
- ultra
- 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
-
- 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
-
- 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
- B29C48/397—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 using a single screw
-
- 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
- B29C2948/92514—Pressure
-
- 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
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to a manufacturing method of tubular products, particularly relating to a method for preparing a big caliber tubular product with an ultra-high molecular weight polyethylene, wherein a liquid crystal LCP, an ultra-high molecular weight polyethylene UHMWPE, and a special auxiliary are mixed evenly by a stirring mill for raw material blending, and are transmitted in a single screw extruder to directly and quickly compress powder material into material with a certain density, and after melting and plasticization, the tubular product is extruded directly; a tube shape is formed after the tubular product sequentially passes through a mould; then the tubes are cooled in a water tank, pulled by a tractor, and finally incised with a set length by a cutter to realize the production of the ultra-high molecular weight polyethylene tubular products. The method is characterized in that an ultrasonic vibration force field is led in before extruding the tubular product after the UHMWPE is melted and plasticized to improve liquidity; wherein the power of the ultrasonic is 50-250W; the frequency thereof is 20,000-100,000 Hz; extrusion pressure of the single screw extruder is 6-8 MPa; pressure drop is 20-40 percent. The method can effectively improve the viscosity of UHMWPE melt of the ultra-high molecular weight polyethylene and facilitate the preparation of the tubular product with a big caliber.
Description
Technical field
The invention belongs to the preparation method of tubing, refer in particular to a kind of method of preparing large-diameter pipe from super-high molecular weight polyethylene material.
Background technology
Ultra-high molecular weight polyethylene (UHMWPE) tubing has that coefficient of friction is little, low, the chemical proofing of abrasion, shock-resistant, resistance to pressure, frost resistance, heat insulating ability, moisten good characteristics such as stickiness, anti-fouling tendency, stress cracking resistance, wholesomeness certainly, be mainly used in solid particle, the conveying of powder, the conveying of slurry, fluid gas is carried, and in fields such as communications and transportation, agricultural, mining, chemical industry, machinery, building, papermaking, weaving, food, medical treatment, physical culture extensive use is arranged.Because high, coefficient of friction of UHMWPE viscosity and critical shear rate are extremely low, its processing and forming is difficulty very.Can only adopt similar processing polytetrafluoroethylregenerated compacting sintering and plunger pushing forming method article of manufacture for a long time, the present ultrahigh molecular weight polyethylene tubing of using, " extrude preparation method " as Chinese patent ZL98100960.3 with the injection grade super-high molecular weight polyethylene PP Pipe Compound, its production method is to adopt the two-step method tube-making process, the difficult control of the viscosity of the molten state of unresolved UHMWPE, cause large-diameter pipe material forming difficulty height, produce unstable, exist UHMWPE high temperature easily to degrade, problems such as easy oxidation.
Sonochemistry (sonochemistry) is that acoustics and chemistry mutually intersect infiltration and emerging intersection and front subject of growing up, and it mainly is a subject that utilizes the ultrasonic wave acceleration and control chemical reaction, improve reaction yield, change the reaction mechanism mechanism of reaction and improve reaction condition and cause new chemical reaction etc.The ultrasonic velocity that is used for chemical reaction is about 1500m/s, and wavelength is 10～0.01cm, and frequency range is about 20kHz, and ultrasonic power is between 500～1500W.Sonochemistry mainly comes from acoustic cavitation---and the formation in liquid hollow chamber, vibration, growth are shunk and collapse, and the physics and the chemical change that cause.At present, the research of sonochemistry has related to material, chemistry, the every field of chemical industry, yet, aspect the in-situ synthesized reaction that utilizes ultrasonic wave acceleration and control ultrahigh molecular weight polyethylene tubing material, 02133674.1 " can be used for extruding the super high molecular weight polyethylene blend and the processing method thereof of processing ", arranged, it mixes the back with raw material and extrudes processing with single-screw machine, in extrusion, apply ultrasonic vibration, to reduce outlet pressure and melt viscosity, its ultrasonic power that adopts is 0～300W, frequency is 20000～100000Hz, extrusion pressure is: 2～4MPa, the superhigh molecular weight polyethylene material of its processing and technological parameter are different with the present invention.
Summary of the invention
The method that the purpose of this invention is to provide a kind of preparing large-diameter pipe from super-high molecular weight polyethylene material can effectively be improved the viscosity of ultra-high molecular weight polyethylene UHMWPE melt, is beneficial to the preparation heavy caliber pipe.
The technical scheme that realizes above-mentioned purpose is:
With liquid crystal LCP and ultra-high molecular weight polyethylene UHMWPE and special assistant through mixer mix carry out the raw material compounding after, send into single screw extrusion machine, directly the powder material Fast Compression is become the material of certain density, carry out behind the fusion plastification directly extruding pipe material, form cast through mould successively again, cool off by water tank again, the hauling machine traction, at last by the cutting machine fixed length cutting, realize the production of ultrahigh molecular weight polyethylene tubing, it is characterized in that introducing the ultrasonic vibration field of force before the extruding pipe material behind the UHMWPE fusion plastification improves its flowability, wherein hyperacoustic power is 50-250W, frequency is 20,000-100,000 HZ, the extrusion pressure of single screw extrusion machine is 6～8MPa, and pressure reduces to 20～40%.
The invention has the advantages that:
Adopt ultrasonic wave to act on the UHMWPE melt, the dither that it can utilize ultrasonic wave to cause, an additional alternate stress has superposeed on main shear flow, the state of UHMWPE material is determined by combined stress. the mass balance in the extrusion like this, momentum balance, variation has all taken place in energy balance relations. and ultrasonic vibration has been strengthened the physics and the chemical change process of polymer work in-process, changed the rheology state of UHMWPE melt, simultaneously, periodic pulsation shearing force produces a large amount of burn-offs, cause the viscosity of UHMWPE melt to reduce, therefore, extruding the required pressure of UHMWPE reduces. and on average extrude flow rate and increase, extrusioning power reduces. and ultrasonic vibration makes also that extruding expands reduces, and the physical and mechanical properties of UHMWPE pipe is improved.
Description of drawings
Fig. 1 is for implementing schematic diagram of the present invention
The 1-supersonic generator; The 2-hopper; The 3-motor; The 4-hollow shaft; The 5-heater; The 6-barrel; The 7-screw rod; The 8-die head; 9-base 10. supersonic generator 11.. die heads
The specific embodiment
Embodiments of the invention 1～5: with liquid crystal LCP and ultra-high molecular weight polyethylene UHMWPE and special assistant through mixer mix carry out the raw material compounding after, send into single screw extrusion machine, direct extruding pipe material after carrying out fusion plastification under the ultrasonic vibration force field, form cast through mould successively again, again by water tank cooling, hauling machine traction, at last by the cutting machine fixed length cutting, realize the production of ultrahigh molecular weight polyethylene tubing, the concrete parameter of the extrusion pressure of wherein hyperacoustic amplitude, frequency, single screw extrusion machine is as follows:
The table 1 ultrasonic vibration field of force/extrusion pressure table (unit: MPa)
| Power (W) | 50 | 100 | 150 | 200 | 220 | 250 | |
| 1 | Frequency 20,000 Hz | 7.91 | 7.56 | 7.43 | 7.34 | 7.28 | 7.21 |
| 2 | Frequency 30,000 Hz | 7.62 | 7.55 | 7.33 | 7.13 | 6.96 | 6.76 |
| 3 | Frequency 50,000 Hz | 7.55 | 7.43 | 7.21 | 6.89 | 6.48 | 6.37 |
| 4 | Frequency 70,000 Hz | 6.83 | 6.76 | 6.68 | 6.55 | 6.42 | 6.30 |
| 5 | Frequency 100,000 Hz | 6.35 | 6.26 | 6.21 | 6.19 | 6.13 | 5.97 |
Owing in extrusion molding, introduce the ultrasonic vibration field of force, by changing relevant parameter the viscosity of UHMWPE melt is reduced, make it under less extrusion pressure, to realize the processing of extruding of ultra-high molecular weight polyethylene heavy caliber pipe; Simultaneously, the effect in the vibration field of force also makes pipe workpiece quality be improved.The pipe performance for preparing is as follows:
The physical and mechanical properties of table 2 tubing and test method
Claims (1)
1. the method for a preparing large-diameter pipe from super-high molecular weight polyethylene material, its with liquid crystal LCP and ultra-high molecular weight polyethylene UHMWPE and special assistant through mixer mix carry out the raw material compounding after, send into single screw extrusion machine, directly the powder material Fast Compression is become the material of certain density, carry out behind the fusion plastification directly extruding pipe material, form cast through mould successively again, cool off by water tank again, the hauling machine traction, at last by the cutting machine fixed length cutting, realize the production of heavy caliber ultrahigh molecular weight polyethylene tubing, extruding pipe material is introduced the ultrasonic vibration field of force before after it is characterized in that the UHMWPE fusion plastification, wherein hyperacoustic power is 50-250W, frequency is 20,000-100,000 HZ, and the extrusion pressure of single screw extrusion machine is 6～8MPa, and pressure reduces to 20～40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100201744A CN101259748A (en) | 2007-03-05 | 2007-03-05 | Method for preparing large-diameter pipe from super-high molecular weight polyethylene material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100201744A CN101259748A (en) | 2007-03-05 | 2007-03-05 | Method for preparing large-diameter pipe from super-high molecular weight polyethylene material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101259748A true CN101259748A (en) | 2008-09-10 |
Family
ID=39960541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100201744A Pending CN101259748A (en) | 2007-03-05 | 2007-03-05 | Method for preparing large-diameter pipe from super-high molecular weight polyethylene material |
Country Status (1)
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|---|---|
| CN (1) | CN101259748A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615802A (en) * | 2012-04-11 | 2012-08-01 | 大连交通大学 | Visual ultrahigh molecular weight continuous extrusion experimental device for polyethylene |
| CN103252886A (en) * | 2012-02-16 | 2013-08-21 | 江西鸿盛塑业有限公司 | Production technology of precision-type high-pressure and high-density pipe fittings |
| CN107696378A (en) * | 2017-11-23 | 2018-02-16 | 华南理工大学 | A kind of super high molecular weight polymer abnormal shape product forming method and equipment |
| CN109226771A (en) * | 2018-11-20 | 2019-01-18 | 深圳艾利佳材料科技有限公司 | A kind of method that ultrasound plastics molding prepares metal product |
| CN111497173A (en) * | 2020-04-29 | 2020-08-07 | 江苏裕兴薄膜科技股份有限公司 | Method for preparing liquid crystal polymer film |
| CN115339099A (en) * | 2022-08-23 | 2022-11-15 | 西安交通大学 | High-viscosity material extrusion device based on double ultrasonic vibrator resonance |
-
2007
- 2007-03-05 CN CNA2007100201744A patent/CN101259748A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103252886A (en) * | 2012-02-16 | 2013-08-21 | 江西鸿盛塑业有限公司 | Production technology of precision-type high-pressure and high-density pipe fittings |
| CN102615802A (en) * | 2012-04-11 | 2012-08-01 | 大连交通大学 | Visual ultrahigh molecular weight continuous extrusion experimental device for polyethylene |
| CN102615802B (en) * | 2012-04-11 | 2014-04-30 | 大连交通大学 | Visualized ultrahigh molecular weight continuous extrusion experimental device for polyethylene |
| CN107696378A (en) * | 2017-11-23 | 2018-02-16 | 华南理工大学 | A kind of super high molecular weight polymer abnormal shape product forming method and equipment |
| CN107696378B (en) * | 2017-11-23 | 2023-06-06 | 华南理工大学 | Forming method and equipment for ultra-high molecular weight polymer special-shaped part |
| CN109226771A (en) * | 2018-11-20 | 2019-01-18 | 深圳艾利佳材料科技有限公司 | A kind of method that ultrasound plastics molding prepares metal product |
| CN111497173A (en) * | 2020-04-29 | 2020-08-07 | 江苏裕兴薄膜科技股份有限公司 | Method for preparing liquid crystal polymer film |
| CN115339099A (en) * | 2022-08-23 | 2022-11-15 | 西安交通大学 | High-viscosity material extrusion device based on double ultrasonic vibrator resonance |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080910 |