CN1377762A - Method for producing super high molecular weight polyvinyl products by screw extruder - Google Patents
Method for producing super high molecular weight polyvinyl products by screw extruder Download PDFInfo
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- CN1377762A CN1377762A CN 02112912 CN02112912A CN1377762A CN 1377762 A CN1377762 A CN 1377762A CN 02112912 CN02112912 CN 02112912 CN 02112912 A CN02112912 A CN 02112912A CN 1377762 A CN1377762 A CN 1377762A
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Abstract
The process of producing superhigh molecular weight polyethylene product includes the steps of: material pre-treatment; adding LCP as modifying assistant into superhigh molecular weight polyethylene; feeding the mixture material into feeding port of the double screw extruder; smelting and denaturing the mixture material inside the double screw extruder; and extruding through the double screw extruder and one single screw extruder connected serially to the double screw extruder. The said production process has low production cost and high production efficiency and it is suitable for mass industrial production.
Description
Technical field
The present invention relates to technical field of macromolecules, specifically a kind of method of utilizing screw extrusion press to produce the ultra high molecular polyethylene goods.
Background technology
Ultrahigh molecular weight polyethylene(UHMWPE) (UHMW-PE) is meant that molecular weight is at the linear structure polyethylene more than 1,500,000.Because its molecular weight is high, have extremely strong wear-resistant, shock-resistant, corrosion-resistant, resistance to low temperature and good self-lubricating property and resistive connection dirt performance, it is the unsurpassed model engineering plastic of a kind of performance, materials such as alternative stainless steel, high mangaenese steel, wearable cast steel, broad market prospect.
But, because the melt temperature of ultrahigh molecular weight polyethylene(UHMWPE) is than higher, mobile poor, material is in high viscoelastic condition behind heating and melting, mobile almost nil, add characteristics such as its frictional coefficient is little, critical shear rate is low, existing plastic processing and extrusion equipment, be difficult to produce mechanicals, more can not form the industrialization continuous production.
For a long time, ultrahigh molecular weight polyethylene(UHMWPE) adopts the sintering drawing method usually: according to the shape chamber of required goods, the processing compacting tool set, the powdered ultrahigh molecular weight polyethylene(UHMWPE) of in mould, packing into, after with modes such as electrically heated material in the mould being carried out fusion, suppress by vulcanizing press, the operating time is long again, the production cost height, production efficiency is low.Domestic once had units concerned to attempt to utilize single screw extrusion machine to produce ultra-high molecular weight polyethylene product, but owing to technical reason is failed successfully; It is reported, still have about producer more than 90% using traditional sintering drawing method to produce this goods abroad so far.
Summary of the invention
The objective of the invention is to seek a kind of method of utilizing screw extrusion press to produce ultra-high molecular weight polyethylene product,, make this goods can be suitable for industrialized mass to reduce production costs, to enhance productivity.
Its main technical schemes is:
B, interpolation auxiliary agent add modified additive liquid crystal polymer LCP in the raw material ultrahigh molecular weight polyethylene(UHMWPE), composition mixture, and wherein ultrahigh molecular weight polyethylene(UHMWPE) is 85～95%, and liquid crystal polymer LCP is 5～15%, and unit is a weight percentage;
C, reinforced adds said mixture in the charging opening of twin screw extruder;
D, fusion plastification, utilize twin screw extruder that said mixture is carried out melt modification, the twin screw length-to-diameter ratio is 23～27, the axis of two screw rods is approximate parallel, rotates in the same way, and the temperature of machine barrel is made as 4 sections, the 1st section: 80～115 ℃, the 2nd section: 130～180 ℃, the 3rd section: 220～260 ℃, the 4th section: 220～260 ℃;
E, extrude, the above-mentioned material of crossing through fusion plastification is put into the single screw extrusion machine that is connected in series with above-mentioned twin screw extruder continue plasticizing, extrude then, single screw slenderness ratio is 23～27, the temperature of machine barrel is made as 4 sections, the 1st section: 220～260 ℃, and the 2nd section: 200～240 ℃, the 3rd section: 200～240 ℃, the 4th section: 190～230 ℃.
F, moulding, the above-mentioned material of extruding changes axial motion into by circumferential motion behind the press filtration plate, enter tubular in-mold molding.
G, cooling and shaping make the work in-process of above-mentioned moulding enter the refrigerating unit internal cooling similar to finished state, change with surrounding temperature, and the work in-process temperature descends gradually, solidifying and setting.For avoiding when the charging opening of twin screw extruder is reinforced, the cutout phenomenon occurring, can on the charging opening of twin screw extruder, electromagnetic oscillation device be installed.
Be the steam of avoiding to exist in the raw material, before adding auxiliary agent, can carry out a, raw materials pretreatment earlier, utilize high-speed mixer that ultrahigh molecular weight polyethylene(UHMWPE) is stirred, make pulverous stock yard produce heat, remove the moisture in the raw material because of friction.
Advantage of the present invention is when adopting screw extrusion press extruding ultrahigh molecular weight polyethylene tubing originally, the plasticizing process is carried out in the single-screw machine tube fully, though screw rod is through optimizing improvement, but plasticizing capacity is nowhere near, high viscoelastic body ultrahigh molecular weight polyethylene(UHMWPE) after the fusion can stop up machine barrel, be attached on the screw rod, cause and to extrude, after the present invention uses twin screw extruder and single screw extrusion machine instead and is connected in series, the material plasticizing process increases, and plasticizing is good, and the flowability of fused ultrahigh molecular weight polyethylene(UHMWPE) improves, on the basis of optimizing screw rod, extrusion ratio is smooth, stable.Secondly, when utilizing single screw extrusion machine extruding ultrahigh molecular weight polyethylene tubing, because of ultrahigh molecular weight polyethylene(UHMWPE) has extremely strong viscosity, must increase the compression ratio of screw rod, to overcome the too big problem of viscosity, increased but the consequence of Chan Shenging is that shearing force is also corresponding therefrom, the increase of shearing force can cause material shear degradation to occur again---a kind of phenomenon that reduces the molecular weight of ultrahigh molecular weight polyethylene(UHMWPE) because of shearing, influence physical properties of articles and oeverall quality, after the present invention adopts cord wood parallel dual-screw expressing technique, can guarantee that material is evenly distributed, shearing force is little, reduces the rate of descent of molecular weight, simultaneously, because plasticizing process mainly is to carry out in twin screw extruder, the effect of single screw extrusion machine mainly is axial release, thereby can not influence the physicals of ultrahigh molecular weight polyethylene(UHMWPE).The 3rd, utilize mode two, that single screw extrusion machine is connected in series to produce ultra-high molecular weight polyethylene product, help building up automatic industrial manufacturing line, compare with traditional sintering process and single screw rod expressing technique, production cost reduces greatly, the production marketing price is lower than existing market price, and economic benefit and social benefit all improve a lot, and also will promote the manufacturing more new development of China's engineering plastics simultaneously.
Effect to each operation is described below.
Generally all contain certain moisture in a, the raw materials pretreatment, raw material, therefore should carry out dry pre-treatment.
B, interpolation auxiliary agent utilize modified additive that ultrahigh molecular weight polyethylene(UHMWPE) is carried out modification, lubricate the viscosity that reduces the fused ultrahigh molecular weight polyethylene(UHMWPE) with outer mode of lubricating, minimizing sticking equipment with interior.
C, reinforced adds said mixture in the charging opening of twin screw extruder, so that next procedure is carried out extrusion modification to mixture.
D, fusion plastification, when utilizing two screw rods approximately parallel, that rotate in the same way to extrude, shearing force to material is smaller, thereby can avoid the molecular structure of the shear fracture ultrahigh molecular weight polyethylene(UHMWPE) of screw rod, and then reduce the phenomenon of its molecular weight, simultaneously, when utilizing this mode to extrude, material temperature is more even, and the plasticizing of material is relatively good, can guarantee that next procedure realizes efficiently extruding.
E, extrude, the ultrahigh molecular weight polyethylene(UHMWPE) powder is behind the twin screw extruder fusion plastification, directly enter the material mouth of single screw extrusion machine by die orifice, continue plasticizing and propelling by single screw extrusion machine, the machine barrel of single screw extrusion machine is made up of slotted line and smooth section, so that the increase transport capacity, and prevent the skidding of material seize; The compression ratio of screw rod is also through optimization design, increases propulsion capability with the change in depth of screw channel.
F, moulding, material becomes mobile reasonable molten mass after two single screw extrusion machine compressions, fusion, plasticizing, after being extruded by single screw extrusion machine, enter pipe mold, is combined into pipe in the mould molding district.
G, cooling and shaping, pipe enter in the cooling diameter-setting equipment, change with surrounding temperature, and heat pipe temperature descends gradually, becomes product.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Embodiment one
A, raw materials pretreatment utilize high-speed mixer that ultrahigh molecular weight polyethylene(UHMWPE) is stirred, and make pulverous stock yard produce heat because of friction, remove the moisture in the raw material.
B, interpolation auxiliary agent add modified additive liquid crystal polymer LCP in the raw material ultrahigh molecular weight polyethylene(UHMWPE), composition mixture, and wherein ultrahigh molecular weight polyethylene(UHMWPE) is 95%, liquid crystal polymer LCP is 5%;
C, reinforced adds said mixture in the charging opening of twin screw extruder;
D, fusion plastification utilize twin screw extruder that said mixture is carried out melt modification, and the twin screw length-to-diameter ratio is that the axis of 27, two screw rods is approximate parallel, rotate in the same way, the temperature of machine barrel is made as 4 sections, the 1st section: 115 ℃, the 2nd section: 180 ℃, the 3rd section: 260 ℃, the 4th section: 260 ℃;
E, extrude, the above-mentioned material of crossing through fusion plastification is put into the single screw extrusion machine that is connected in series with above-mentioned twin screw extruder continue plasticizing, extrude then, single screw slenderness ratio is 23, the temperature of machine barrel is made as 4 sections, the 1st section: 220 ℃, and the 2nd section: 200 ℃, the 3rd section: 200 ℃, the 4th section: 190 ℃.
F, moulding, the above-mentioned material of extruding changes axial motion into by circumferential motion behind the press filtration plate, enter tubular in-mold molding.
G, cooling and shaping make the work in-process of above-mentioned moulding enter the refrigerating unit internal cooling similar to finished state, change with surrounding temperature, and the work in-process temperature descends gradually, solidifying and setting.
Embodiment two
A, raw materials pretreatment utilize high-speed mixer that ultrahigh molecular weight polyethylene(UHMWPE) is stirred, and make pulverous stock yard produce heat because of friction, remove the moisture in the raw material.
B, interpolation auxiliary agent add modified additive liquid crystal polymer LCP in the raw material ultrahigh molecular weight polyethylene(UHMWPE), composition mixture, and wherein ultrahigh molecular weight polyethylene(UHMWPE) is 85%, and liquid crystal polymer LCP is 15%, and unit is a weight percentage;
C, reinforced adds said mixture in the charging opening of twin screw extruder;
D, fusion plastification utilize twin screw extruder that said mixture is carried out melt modification, and the twin screw length-to-diameter ratio is that the axis of 23, two screw rods is approximate parallel, rotate in the same way, the temperature of machine barrel is made as 4 sections, the 1st section: 80 ℃, the 2nd section: 130 ℃, the 3rd section: 220 ℃, the 4th section: 220 ℃;
E, extrude, the above-mentioned material of crossing through fusion plastification is put into the single screw extrusion machine that is connected in series with above-mentioned twin screw extruder continue plasticizing, extrude then, single screw slenderness ratio is 27, the temperature of machine barrel is made as 4 sections, the 1st section: 260 ℃, and the 2nd section: 240 ℃, the 3rd section: 240 ℃, the 4th section: 230 ℃.
F, moulding, the above-mentioned material of extruding changes axial motion into by circumferential motion behind the press filtration plate, enter tubular in-mold molding.
G, cooling and shaping make the work in-process of above-mentioned moulding enter the refrigerating unit internal cooling similar to finished state, change with surrounding temperature, and the work in-process temperature descends gradually, solidifying and setting.
Embodiment three
A, raw materials pretreatment utilize high-speed mixer that ultrahigh molecular weight polyethylene(UHMWPE) is stirred, and make pulverous stock yard produce heat because of friction, remove the moisture in the raw material.
B, interpolation auxiliary agent add modified additive liquid crystal polymer LCP in the raw material ultrahigh molecular weight polyethylene(UHMWPE), composition mixture, and wherein ultrahigh molecular weight polyethylene(UHMWPE) is 90%, and liquid crystal polymer LCP is 10%, and unit is a weight percentage;
C, reinforced adds said mixture in the charging opening of twin screw extruder;
D, fusion plastification utilize twin screw extruder that said mixture is carried out melt modification, and the twin screw length-to-diameter ratio is that the axis of 25, two screw rods is approximate parallel, rotate in the same way, the temperature of machine barrel is made as 4 sections, the 1st section: 95 ℃, the 2nd section: 155 ℃, the 3rd section: 240 ℃, the 4th section: 240 ℃;
E, extrude, the above-mentioned material of crossing through fusion plastification is put into the single screw extrusion machine that is connected in series with above-mentioned twin screw extruder continue plasticizing, extrude then, single screw slenderness ratio is 25, the temperature of machine barrel is made as 4 sections, the 1st section: 240 ℃, and the 2nd section: 220 ℃, the 3rd section: 220 ℃, the 4th section: 210 ℃.
F, moulding, the above-mentioned material of extruding changes axial motion into by circumferential motion behind the press filtration plate, enter tubular in-mold molding.
G, cooling and shaping make the work in-process of above-mentioned moulding enter the refrigerating unit internal cooling similar to finished state, change with surrounding temperature, and the work in-process temperature descends gradually, solidifying and setting.
Embodiment four
A, raw materials pretreatment utilize high-speed mixer that ultrahigh molecular weight polyethylene(UHMWPE) is stirred, and make pulverous stock yard produce heat because of friction, remove the moisture in the raw material.
B, interpolation auxiliary agent add modified additive liquid crystal polymer LCP in the raw material ultrahigh molecular weight polyethylene(UHMWPE), composition mixture, and wherein ultrahigh molecular weight polyethylene(UHMWPE) is 87%, and liquid crystal polymer LCP is 13%, and unit is a weight percentage;
C, reinforced adds said mixture in the charging opening of twin screw extruder;
D, fusion plastification utilize twin screw extruder that said mixture is carried out melt modification, and the twin screw length-to-diameter ratio is that the axis of 24, two screw rods is approximate parallel, rotate in the same way, the temperature of machine barrel is made as 4 sections, the 1st section: 85 ℃, the 2nd section: 140 ℃, the 3rd section: 230 ℃, the 4th section: 230 ℃;
E, extrude, the above-mentioned material of crossing through fusion plastification is put into the single screw extrusion machine that is connected in series with above-mentioned twin screw extruder continue plasticizing, extrude then, single screw slenderness ratio is 24, the temperature of machine barrel is made as 4 sections, the 1st section: 230 ℃, and the 2nd section: 210 ℃, the 3rd section: 210 ℃, the 4th section: 220 ℃.
F, moulding, the above-mentioned material of extruding changes axial motion into by circumferential motion behind the press filtration plate, enter tubular in-mold molding.
G, cooling and shaping make the work in-process of above-mentioned moulding enter the refrigerating unit internal cooling similar to finished state, change with surrounding temperature, and the work in-process temperature descends gradually, solidifying and setting.
Embodiment five
A, raw materials pretreatment utilize high-speed mixer that ultrahigh molecular weight polyethylene(UHMWPE) is stirred, and make pulverous stock yard produce heat because of friction, remove the moisture in the raw material.
B, interpolation auxiliary agent add modified additive liquid crystal polymer LCP in the raw material ultrahigh molecular weight polyethylene(UHMWPE), composition mixture, and wherein ultrahigh molecular weight polyethylene(UHMWPE) is 93%, and liquid crystal polymer LCP is 7%, and unit is a weight percentage;
C, reinforced adds said mixture in the charging opening of twin screw extruder;
D, fusion plastification utilize twin screw extruder that said mixture is carried out melt modification, and the twin screw length-to-diameter ratio is that the axis of 23～27, two screw rods is approximate parallel, rotate in the same way, the temperature of machine barrel is made as 4 sections, the 1st section: 110 ℃, the 2nd section: 170 ℃, the 3rd section: 250 ℃, the 4th section: 250 ℃;
E, extrude, the above-mentioned material of crossing through fusion plastification is put into the single screw extrusion machine that is connected in series with above-mentioned twin screw extruder continue plasticizing, extrude then, single screw slenderness ratio is 26, the temperature of machine barrel is made as 4 sections, the 1st section: 250 ℃, and the 2nd section: 230 ℃, the 3rd section: 230 ℃, the 4th section: 220 ℃.
F, moulding, the above-mentioned material of extruding changes axial motion into by circumferential motion behind the press filtration plate, enter tubular in-mold molding.
G, cooling and shaping make the work in-process of above-mentioned moulding enter the refrigerating unit internal cooling similar to finished state, change with surrounding temperature, and the work in-process temperature descends gradually, solidifying and setting.
Claims (5)
1, utilize screw extrusion press to produce the method for ultra-high molecular weight polyethylene product, it is characterized in that:
B, interpolation auxiliary agent add modified additive liquid crystal polymer LCP in the raw material ultrahigh molecular weight polyethylene(UHMWPE), composition mixture, and wherein ultrahigh molecular weight polyethylene(UHMWPE) is 85～95%, and liquid crystal polymer LCP is 5～15%, and unit is a weight percentage;
C, reinforced adds said mixture in the charging opening of twin screw extruder;
D, fusion plastification, utilize twin screw extruder that said mixture is carried out melt modification, the twin screw length-to-diameter ratio is 23～27, the axis of two screw rods is approximate parallel, rotates in the same way, and the temperature of machine barrel is made as 4 sections, the 1st section: 80～115 ℃, the 2nd section: 130～180 ℃, the 3rd section: 220～260 ℃, the 4th section: 220～260 ℃;
E, extrude, the above-mentioned material of crossing through fusion plastification is put into the single screw extrusion machine that is connected in series with above-mentioned twin screw extruder continue plasticizing, extrude then, single screw slenderness ratio is 23～27, the temperature of machine barrel is made as 4 sections, the 1st section: 220～260 ℃, and the 2nd section: 200～240 ℃, the 3rd section: 200～240 ℃, the 4th section: 190～230 ℃.
2, according to the described method of claim 1, it is characterized in that before adding auxiliary agent, carrying out a, raw materials pretreatment earlier, utilize high-speed mixer that ultrahigh molecular weight polyethylene(UHMWPE) is stirred, make pulverous stock yard produce heat because of friction, remove the moisture in the raw material.
3, according to the described method of claim 1, it is characterized in that after extruding, carrying out f, moulding, the above-mentioned material of extruding changes axial motion into by circumferential motion behind the press filtration plate, enter tubular in-mold molding.
4, according to the described method of claim 1, it is characterized in that: carry out g, cooling and shaping after moulding, make the work in-process of above-mentioned moulding enter the refrigerating unit internal cooling similar to finished state, change with surrounding temperature, the work in-process temperature descends gradually, solidifying and setting.
5,, it is characterized in that on the charging opening of twin screw extruder, electromagnetic oscillation device being installed according to the described method of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 02112912 CN1377762A (en) | 2002-04-23 | 2002-04-23 | Method for producing super high molecular weight polyvinyl products by screw extruder |
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| CN 02112912 CN1377762A (en) | 2002-04-23 | 2002-04-23 | Method for producing super high molecular weight polyvinyl products by screw extruder |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429263C (en) * | 2004-11-18 | 2008-10-29 | 成都新柯力化工科技有限公司 | Biological-degradable starch/polyester plastic completely and production thereof |
| CN102927379A (en) * | 2012-11-26 | 2013-02-13 | 天津军星管业集团有限公司 | Novel oxygen blocking type polybutene tubular product |
| CN103351529A (en) * | 2013-06-28 | 2013-10-16 | 广东威林工程塑料有限公司 | High-fluidity and high-temperature UHMWPE/LCP/PP alloy material and preparation method thereof |
| CN104526903A (en) * | 2014-12-19 | 2015-04-22 | 南京炫胜塑料科技股份有限公司 | Device and method for extruding and granulating special material for polyethylene air-permeable membrane |
| CN107216517A (en) * | 2017-05-08 | 2017-09-29 | 衢州学院 | A kind of preparation method of ultra-high molecular weight polyethylene 3D printing consumptive material |
| CN110181853A (en) * | 2019-05-20 | 2019-08-30 | 宁波市奥特曼自动化设备有限公司 | A kind of full-automatic carbon-point extrusion shaping machine |
| CN115464853A (en) * | 2021-10-21 | 2022-12-13 | 浙江海象新材料股份有限公司 | Preparation method of SPC (SPC) floor and SPC floor |
-
2002
- 2002-04-23 CN CN 02112912 patent/CN1377762A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429263C (en) * | 2004-11-18 | 2008-10-29 | 成都新柯力化工科技有限公司 | Biological-degradable starch/polyester plastic completely and production thereof |
| CN102927379A (en) * | 2012-11-26 | 2013-02-13 | 天津军星管业集团有限公司 | Novel oxygen blocking type polybutene tubular product |
| CN103351529A (en) * | 2013-06-28 | 2013-10-16 | 广东威林工程塑料有限公司 | High-fluidity and high-temperature UHMWPE/LCP/PP alloy material and preparation method thereof |
| CN104526903A (en) * | 2014-12-19 | 2015-04-22 | 南京炫胜塑料科技股份有限公司 | Device and method for extruding and granulating special material for polyethylene air-permeable membrane |
| CN107216517A (en) * | 2017-05-08 | 2017-09-29 | 衢州学院 | A kind of preparation method of ultra-high molecular weight polyethylene 3D printing consumptive material |
| CN110181853A (en) * | 2019-05-20 | 2019-08-30 | 宁波市奥特曼自动化设备有限公司 | A kind of full-automatic carbon-point extrusion shaping machine |
| CN110181853B (en) * | 2019-05-20 | 2024-09-17 | 宁波市奥特曼自动化设备有限公司 | Full-automatic carbon-rod extrusion molding machine |
| CN115464853A (en) * | 2021-10-21 | 2022-12-13 | 浙江海象新材料股份有限公司 | Preparation method of SPC (SPC) floor and SPC floor |
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