CN1126654C - Method for improving processing performance of linear low density polyethylene - Google Patents
Method for improving processing performance of linear low density polyethylene Download PDFInfo
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- CN1126654C CN1126654C CN99115123A CN99115123A CN1126654C CN 1126654 C CN1126654 C CN 1126654C CN 99115123 A CN99115123 A CN 99115123A CN 99115123 A CN99115123 A CN 99115123A CN 1126654 C CN1126654 C CN 1126654C
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Abstract
The present invention relates to a method for improving the processing properties of linear low-density polyethylene, which is characterized in that the linear low-density polyethylene is conveyed by a screw rod (8) of an ultrasonic extrusion device to be plasticized and melted by 120 to 220DEGC; melt (9) is flown out from a machine head neck mould (5) after being irradiated by an ultrasonic probe (4); ultrasonic irradiation of which the frequency from 18 to 25KHz and the power is from 50 to 300W is exerted when the melt is extruded. As a result, the movement of the molecule sections of the linear low-density polyethylene can be intensified by the ultrasonic irradiation, so the pressure and the apparent viscosity of an extruded neck mould of the melt of the linear low-density polyethylene are reduced, the extrusion output is increased, a melt fracture phenomenon of the melt fracture is eliminated and the quality of extruded products is increased.
Description
The invention belongs to polymer processing field.
Polyethylene is most important in the world general-purpose plastics, accounts for about 30% of plastics total output.It is reported that whole world polyethylene production in 1998 has reached 0.54 hundred million ton (Anon.ModernPlast., 1998,75 (10), 256) and LLDPE (LLDPE) as the poly new varieties of the third generation, development just by leaps and bounds in recent years.Price is low, output is high, good mechanical property advantages such as (as performances such as hot strength, tear resistance, anti-puncture force and anti-environmental stress cracks) because LLDPE has, capture low density polyethylene (LDPE) (LDPE) market rapidly, estimating to replace the most at last 70% common low density polyethylene (LDPE) goods.But the feature of LLDPE narrow molecular weight distribution causes its melt viscosity big, is difficult to process on common polyethylene formation equipment thereby easily produce the melt fracture phenomenon.Therefore, improve the melt characteristic of LLDPE, improve its processing characteristics and have crucial meaning.
At present, the main method of improving processing performance of linear low density polyethylene has:
One. with the blending and modifying of other polymer.
By in LLDPE, add low density polyethylene (LDPE) as processing aid or add low polymer such as fluoropolymer polymer, organosilicon polymer, poly alpha methylstyrene, low molecular weight polycaprolactone alkene etc. as modifier (Wu Peixi, Zhang Liucheng writes, polymer blending modification, China Light Industry Press, Beijing, 1996), can enlarge markedly the flowability of LLDPE melt, avoid the generation of melt fracture and improve processing output, general former needn't be transformed just can be in order to processing.But this can influence the excellent properties of LLDPE itself, reduces Products Quality, even causes industrial pollution, does not fundamentally solve the problem of processing performance of linear low density polyethylene difference.
Two. adopt custom-designed plastic processing machinery.
With the extrusion molding is example, and (C. Lao Wendaier is outstanding, and Chen Wenying etc. translate, and plastics are extruded, China Light Industry Press, Beijing, 1996 to adopt counter-rotating double screw extruder, plunger piston extrusion machine and electromagnetic dynamic plasticizing extruder; Qu Jinping, Chinese plastics, 1997,11 (3), 69) etc. process equipment can effectively reduce the extrusion pressure and the apparent viscosity of melt, reduce the processing temperature of LLDPE, improve the quality of extruded product, improve the processing characteristics of LLDPE; Development new screw, increase extruder screw diameter and draw ratio also can improve extrudes output and plasticizing quality, improves the quality of products, and is beneficial to the processing of LLDPE.But adopt special processing equipment can make manufacturer's originaling forming idleness of equipment and waste, increased cost and working strength, cause the unreasonable of resource distribution, do not meet the actual needs of producer.
The objective of the invention is provides a kind of method of improving processing performance of linear low density polyethylene at the deficiencies in the prior art, be characterized in the ultrasound wave irradiation device is installed at the machine head port mould place of extruder, improved the processing characteristics of LLDPE greatly by the ultrasound wave irradiation effect, effect is remarkable, and is simple.
Purpose of the present invention realizes by following technical measures:
1. LLDPE is carried by the screw rod (8) of ultrasonic extrusion device, through 120～220 ℃ of plastifying fusions, flow out from machine head port mould (5) outlet behind melt (9) process ultrasonic probe (4) irradiation, melt applies frequency 18～25KHz when extruding, the ultrasound wave irradiation of power 50～300W.
2. ultrasonic probe (4) is installed in the machine head port mould (5) of extruder (1), and ultrasonic probe (4) connects supersonic generator (2) by transducer (3).
3. ultrasonic extrusion device has not only improved the processing characteristics of LLDPE, also is applicable to the processing characteristics of improving low density polyethylene (LDPE) (LDPE), high density polyethylene (HDPE) (HDPE), polypropylene (PP) and polystyrene plastic materials such as (PS).
Experimental result shows, the ultrasound wave irradiation effect can activate the motion of LLDPE molecule segment, significantly reduce the extrusion neck ring mold pressure and the apparent viscosity of LLDPE melt, extruding output increases considerably, behind effect of irradiation, the extrudate outlet is expanded and is reduced, and the extrudate presentation quality obviously improves.
The concrete structure of ultrasonic extrusion device of the present invention is provided by the following drawings and embodiment:
Fig. 1 is the structural representation of ultrasonic extrusion device.
1 extruder, 2 supersonic generators, 3 transducers, 4 ultrasonic probes, 5 machine head port moulds, 6 heating jackets, 7 thermocouples.
Fig. 2 is the machine head port mould structural representation.
8 screw rods, 9 melts.
Fig. 3 is without ultrasound wave irradiation LLDPE extrudate surface topography SEM photo (extrusion temperature 160 (℃, extruder rotating speed 40rpm).
Fig. 4 is through frequency 20KHz, the LLDPE extrudate surface topography SEM photo (160 ℃ of extrusion temperatures, extruder rotating speed 40rpm) of power 250W ultrasound wave irradiation.
Embodiment:
Below be the specific descriptions of the present invention being carried out by embodiment; be necessary to be pointed out that at this following examples only are used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, the person skilled in art can make some nonessential improvement and adjustment to the present invention according to the invention described above content.
1. each section of control extruder heating-up temperature is respectively 130,150, and 160,160 ℃, extruder rotating speed 40rpm applies frequency 20KHz in the extrusion of LLDPE, the ultrasound wave irradiation of power 250W.The extrusion neck ring mold pressure test shows, apply ultrasound wave irradiation after, a mouthful molding pressure drops to 5.1MPa by 6.8MPa, as calculated, apparent melt viscosity reduces by 25%, extrudes output and improves 87%.Scanning electron microscopic observation extrudate surface topography is without the serious sharkskin phenomenon of LLDPE extrudate surface appearance of irradiation, as shown in Figure 3; Behind the ultrasound wave irradiation, extrudate smooth surface, defective seldom, as shown in Figure 4.
2. each section of control extruder heating-up temperature is respectively 130,150, and 170,170 ℃, extruder rotating speed 30rpm applies frequency 20KHz in the extrusion of LLDPE, the ultrasound wave irradiation of power 250W.The extrusion neck ring mold pressure test shows, apply ultrasound wave irradiation after, a mouthful molding pressure drops to 4.1MPa by 5.8MPa, as calculated, apparent melt viscosity reduces by 28%, extrudes output and improves 83%.
3. each section of control extruder heating-up temperature is respectively 130,150, and 170,170 ℃, extruder rotating speed 10rpm applies frequency 20KHz in the extrusion of LLDPE, the ultrasound wave irradiation of power 250W.The extrusion neck ring mold pressure test shows, apply ultrasound wave irradiation after, a mouthful molding pressure drops to 2.0MPa by 3.4MPa, as calculated, apparent melt viscosity reduces by 40%, extrudes output and improves 123%.
4. each section of control extruder heating-up temperature is respectively 130,150, and 170,170 ℃, extruder rotating speed 10rpm applies frequency 20KHz in the extrusion of LLDPE, the ultrasound wave irradiation of power 150W.The extrusion neck ring mold pressure test shows, apply ultrasound wave irradiation after, a mouthful molding pressure drops to 2.5MPa by 3.4MPa, as calculated, apparent melt viscosity reduces by 26%, extrudes output and improves 48%.
5. each section of control extruder heating-up temperature is respectively 130,160, and 180,180 ℃, extruder rotating speed 20rpm applies frequency 20KHz in the extrusion of LLDPE, the ultrasound wave irradiation of power 250W.The extrusion neck ring mold pressure test shows, apply ultrasound wave irradiation after, a mouthful molding pressure drops to 3.1MPa by 4.4MPa, as calculated, apparent melt viscosity reduces by 28%, extrudes output and improves 75%.
6. each section of control extruder heating-up temperature is respectively 130,160, and 190,190 ℃, extruder rotating speed 20rpm applies frequency 20KHz in the extrusion of LLDPE, the ultrasound wave irradiation of power 250W.The extrusion neck ring mold pressure test shows, apply ultrasound wave irradiation after, a mouthful molding pressure drops to 2.8MPa by 4.1MPa, as calculated, apparent melt viscosity reduces by 30%, extrudes output and improves 79%.
7. each section of control extruder heating-up temperature is respectively 140,180, and 200,200 ℃, extruder rotating speed 10rpm applies frequency 20KHz in the extrusion of HDPE, the ultrasound wave irradiation of power 250W.The extrusion neck ring mold pressure test shows, apply ultrasound wave irradiation after, a mouthful molding pressure drops to 2.9MPa by 4.3MPa, as calculated, apparent melt viscosity reduces by 34%, extrudes output and improves 88%.
8. each section of control extruder heating-up temperature is respectively 180,190, and 220,220 ℃, extruder rotating speed 20rpm applies frequency 20KHz in the extrusion of PS, the ultrasound wave irradiation of power 250W.The extrusion neck ring mold pressure test shows, apply ultrasound wave irradiation after, a mouthful molding pressure drops to 1.5MPa by 2.0MPa, as calculated, apparent melt viscosity reduces by 34%, extrudes output and improves 50%.
The present invention has the following advantages:
1. by ultrasound wave irradiation, can significantly reduce the apparent viscosity of LLDPE melt and extrude pressure Power is eliminated the melt fracture phenomenon, improves and extrudes output, has greatly improved the processing of LLDPE Performance.
2. by ultrasound wave irradiation, can overcome under the properties of product that cause owing to interpolation low-molecular-weight auxiliary agent viscosity reduction Falling and chemical industrial pollution, is a kind of viscosity reducing process of clean and effective, and it is poly-to be widely used in linea low density The machine-shaping of ethene.
3. adopt the ultrasound wave irradiation technology, only need existing machine-shaping device is transformed a little, but both processing lines The property low density polyethylene (LDPE), can be used for again processing high density polyethylene (HDPE), low density polyethylene (LDPE), polypropylene, poly-Other plastic material such as styrene, operation is simple, safe and reliable, avoided overlapping investment, reduced Production cost.
Claims (2)
1. improve the method for LLDPE high density polyethylene (HDPE) polystyrene processing characteristics, it is characterized in that screw rod (8) conveying by ultrasonic extrusion device, through 120～220 ℃ of plastifying fusions, flow out from machine head port mould (5) outlet behind melt (9) process ultrasonic probe (4) irradiation, melt applies frequency 18～25KHz when extruding, the ultrasound wave irradiation of power 50～300W.
2. according to the described device that improves LLDPE high density polyethylene (HDPE) polystyrene processing characteristics of claim 1, it is characterized in that and will ultrasonic probe (4) be installed in the machine head port mould (5) of extruder (1), ultrasonic probe (4) connects supersonic generator (2) by transducer (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99115123A CN1126654C (en) | 1999-09-09 | 1999-09-09 | Method for improving processing performance of linear low density polyethylene |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99115123A CN1126654C (en) | 1999-09-09 | 1999-09-09 | Method for improving processing performance of linear low density polyethylene |
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| Publication Number | Publication Date |
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| CN1287915A CN1287915A (en) | 2001-03-21 |
| CN1126654C true CN1126654C (en) | 2003-11-05 |
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| CN99115123A Expired - Fee Related CN1126654C (en) | 1999-09-09 | 1999-09-09 | Method for improving processing performance of linear low density polyethylene |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411860C (en) * | 2002-07-02 | 2008-08-20 | 四川大学 | Method and equipment for improving metallocene catalyzed polythene working property |
| CN101671412B (en) * | 2009-10-10 | 2011-08-17 | 江苏圣杰实业有限公司 | 1-polyolefin halogenation production method |
| US20130266700A1 (en) * | 2010-06-14 | 2013-10-10 | Abbott Laboratories | Ultrasonically-assisted extrusion methods for manufacturing powdered nutritional products |
| CN104728220A (en) * | 2015-04-01 | 2015-06-24 | 广东工业大学 | Device for improving fluidity of viscoelastic fluid |
| CN104841322A (en) * | 2015-04-01 | 2015-08-19 | 广东工业大学 | Method for improving liquidity of viscoelastic fluid via high frequency ultrasounds |
| CN105014925A (en) * | 2015-07-27 | 2015-11-04 | 广东工业大学 | Device and method for manufacturing metal flashing plastic through ultrasonic treatment |
| CN107141729A (en) * | 2017-05-12 | 2017-09-08 | 绵阳市杉木塑料科技有限责任公司 | The method for recycling plastics |
| CN108794883A (en) * | 2018-05-23 | 2018-11-13 | 青岛科技大学 | The preparation method of SiC reaction modifying PP heat-conductive composite materials |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4510305A (en) * | 1967-11-21 | 1985-04-09 | Coathylene S.A. | Process for the production of polypropylene powders |
| CN1037179A (en) * | 1988-04-19 | 1989-11-15 | 成都科技大学 | Preparation of modified polyvinyl fibre by chemical method |
| CN1069742A (en) * | 1991-08-27 | 1993-03-10 | 福建师范大学 | The technology of preparation polyethylene, polypropylene powder |
| JPH0757567A (en) * | 1993-08-10 | 1995-03-03 | Fujikura Ltd | Manufacture of cv cable |
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1999
- 1999-09-09 CN CN99115123A patent/CN1126654C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4510305A (en) * | 1967-11-21 | 1985-04-09 | Coathylene S.A. | Process for the production of polypropylene powders |
| CN1037179A (en) * | 1988-04-19 | 1989-11-15 | 成都科技大学 | Preparation of modified polyvinyl fibre by chemical method |
| CN1069742A (en) * | 1991-08-27 | 1993-03-10 | 福建师范大学 | The technology of preparation polyethylene, polypropylene powder |
| JPH0757567A (en) * | 1993-08-10 | 1995-03-03 | Fujikura Ltd | Manufacture of cv cable |
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