CN1156528C - Organic silicon/ultra-high molecular weight polyethylene blend and its preparation method - Google Patents

Organic silicon/ultra-high molecular weight polyethylene blend and its preparation method Download PDF

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CN1156528C
CN1156528C CNB011301619A CN01130161A CN1156528C CN 1156528 C CN1156528 C CN 1156528C CN B011301619 A CNB011301619 A CN B011301619A CN 01130161 A CN01130161 A CN 01130161A CN 1156528 C CN1156528 C CN 1156528C
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molecular weight
weight polyethylene
blend
ultrahigh molecular
ultra
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CN1428370A (en
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阎镇达
范奎城
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Abstract

The present invention relates to an ultrahigh molecular weight polyethylene blend and a preparation method thereof. The ultrahigh molecular weight polyethylene blend is prepared from raw materials, in weight percentages, 85 to 95% of ultrahigh molecular weight polyethylene, 3 to 15% of polysiloxane and 0.2 to 2% of antioxidants. The raw materials are homogeneously mixed, stirred and dried in a vacuum drying box for 5 to 7 hours at 40 to 60 DEG C; the dried raw materials are extruded and pelletized; the temperature of the feed section of the raw materials is from 200 to 240 DEG C; the temperature of the compression section is from 240 to 260 DEG C; the temperature of the homogenization section is from 280 to 320 DEG C; and the temperature of an outlet is from 250 to 300 DEG C. Because organic silicon is added as modifiers, the blend can greatly improve the processing flowability, be applied to extrusion materials and injection materials, realize the purpose of any injection molded parts obtained by processing by an injection machine, manufacture various mechanical components, etc. and replace plastic parts and metal parts originally used on multiple food, medicinal equipment parts and multiple assembly lines, sports equipment, artificial limbs, artificial joints, etc. for surgery. The blend is extruded into multiple plates and pipes, calendered into sheets, hollowly blown to form multiple containers, etc. and has very wide application.

Description

Organic silicon/ultra-high molecular weight polyethylene blend and preparation method thereof
Technical field
The present invention relates to technical field of polymer materials, be specifically related to superpolymer and forming processing technology field thereof, more particularly, relate to a kind of extruding and injection stage organic silicon/ultra-high molecular weight polyethylene blend and preparation method thereof.
Background technology
Ultrahigh molecular weight polyethylene(UHMWPE) (hereinafter to be referred as UHMWPE) is the very excellent thermoplastic engineering plastic of a kind of over-all properties.Because of its have superpower wear resistance (be iron and steel 8-9 doubly, 4 times of nylon, 27 times of brass); Excellent in impact resistance (being 2 times of polycarbonate, 5 times of ABS, 15 times of polyoxymethylene), especially rare is still keeps its excellent shock strength in liquid nitrogen-196 ℃; Good resistance and erosion resistance can compare favourably with tetrafluoroethylene, in certain temperature and concentration range, and can anti-various corrosive liquid and organic solvent; Frictional coefficient low (its kinetic friction coefficient is 0.1-0.22) is the ideal self-lubricating material; Advantages such as fabulous noise reduction and nontoxicity, thereby worldwide extremely people's favor, its range of application is very extensive.
But, (reach 10 because the melting viscosity of UHMWPE is high 9Pa.S), flowing property extreme difference---its melting index of melting body is almost nil.So, be difficult to directly to extrude and to inject machine-shaping, this be because:
1.UHMWPE viscosity high, do not become viscous state, but be in high viscoelastic attitude.So add man-hour on conventional screw forcing machine and injector, material is difficult to advance along screw rod, rotates together but encase screw rod, is absorbed in the state that can not extrude, forms " material plug ";
2.UHMWPE frictional coefficient extremely low, powder is very easily skidded in fill process, be difficult for charging;
3.UHMWPE critical shear rate very low, about 10 -2/ S can cause when extrusion moulding and melt body and break, and can cause pore and delamination owing to the injection stream state occurring when injection molding;
4. mold temperature narrow range, very easily oxidative degradation.
Because there is above-mentioned difficult point in the processing of UHMWPE, so existing processing technology generally is to adopt intermittent type molding sintering moulding process, with simple sheet material and bar, carries out secondary mechanical again and is processed into goods.Thereby limit the industrial applications of this elite clone.The forcing machine and the injector of designing high-power though abroad begin one's study in recent years, as high pressure, the high speed injection machine of Mitsui company, its injection pressure reaches 290Mpa, can inject small-sized goods, but apparatus expensive, energy consumption height are difficult to machining large goods and industrialization and use.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of ultra-high molecular weight polyethylene blend of extruding and injecting and preparation method thereof that is used to, not only can greatly improve the processing fluidity of ultrahigh molecular weight polyethylene(UHMWPE), can significantly reduce the energy expenditure of processing units simultaneously.
Above-mentioned technical problem of the present invention is to solve like this, construct a kind of ultra-high molecular weight polyethylene blend, adopt unique organosilicon modifier and ultrahigh molecular weight polyethylene(UHMWPE) to carry out blend, produce the ultrahigh molecular weight polyethylene(UHMWPE) PP Pipe Compound that directly to extrude and to inject, it is characterized in that described blend composition comprises ultrahigh molecular weight polyethylene(UHMWPE) 85-97%, organosilicon 3-15%, oxidation inhibitor 0.2-2%, the weight percent sum of each component is 100%.
Another technical problem of the present invention is to solve like this, construct a kind of preparation method who is suitable for the ultrahigh molecular weight polyethylene(UHMWPE) PP Pipe Compound of extruding and injecting, may further comprise the steps: with raw material with following weight percent mixing: ultrahigh molecular weight polyethylene(UHMWPE) 85-97%, organosilicon 3-15%, oxidation inhibitor 0.2-2%, the weight percent sum of each component is 100%; Said mixture is stirred, in vacuum drying oven, dried 5-7 hour for 40-60 ℃; Above-mentioned dried raw material is carried out extruding pelletization, and its extrusion temperature is: feed zone: 200-240 ℃, and compression section: 240-260 ℃, homogenizing zone: 260-320 ℃, outlet: 250-300 ℃.
Above-mentioned according to organic silicon/ultra-high molecular weight polyethylene blend PP Pipe Compound provided by the invention and preparation method thereof in, described organosilicon is a polysiloxane.
Above-mentioned according to organic silicon/ultra-high molecular weight polyethylene blend PP Pipe Compound provided by the invention and preparation method thereof in, described oxidation inhibitor is a kind of in following: phenolic antioxidants such as antioxidant 1010 or B215.
Implement organic silicon/ultra-high molecular weight polyethylene blend PP Pipe Compound provided by the invention and preparation method thereof,, can greatly improve the processing fluidity of UHMWPE owing in ultrahigh molecular weight polyethylene(UHMWPE), add organosilicon as properties-correcting agent.Injection material with material of the present invention is made can be processed into any moulding with injector easily.Can be used for making various components of machine (as axle sleeve), valve, pump case, impeller, carrying roller etc.; Cryogenic freezing machinery and low temperature resistant parts of nuclear industry and radioprotective shading unit etc.; Can replace former usefulness plastic components and metal parts at various food and medicine equipment unit, various assembling line, and surgery is used with artificial limb, joint prosthesis etc. very extensive.
Embodiment
Properties-correcting agent used in the present invention is polysiloxane (Silicones), is commonly called as " organosilicon ".Organosilicon has the characteristic of organic polymer and inorganic polymer, thereby many unique distinctions are arranged on performance.Compare with other macromolecular material, organosilyl outstanding properties is:
1. good temperature tolerance
General high molecular synthetic material great majority are to be backbone structure with carbon-to-carbon (C-C) key, and as PP, PE, styrene-butadiene rubber(SBR) etc., and organosilicon is to be backbone structure with silicon-oxygen (Si-O) key, and the bond energy of Si-O key is than the bond energy height (C-C bond energy/KJMol of C-C key -1Be 344.4, Si-O bond energy/KJMol -1Be 504.6), so, the thermostability of organosilicon product higher (being generally more than 200 ℃).The thermostability of organosilicon product generates non-combustible carbonic acid gas when also showing burning and puts out certainly.
2. You Yi weathering resistance
The main chain of organosilicon product is Si-O-Si, and unparalleled key exists, and therefore is not subject to the decomposition of UV-light and ozone.The bond distance of Si-O-Si key approximately is C-C key bond distance's 1 sesquialter, and it is had than the better thermostability of other high molecular synthetic material and anti-irradiation and weather resistance.
3. excellent electric insulation and excellent hydrophobic nature
4. good physiology inertia
Polysiloxane compound is one of compound of known non-activity, very anti-biological aging and nontoxicity.
5. fabulous surface tension and surface energy
Organosilyl main chain is very submissive, and the kindliness of chain can be by weighing around the energy of Si-O key rotation.The energy that is rotated around the C-C key in PVC is 13.76KJ/mol; In tetrafluoroethylene, this energy is greater than 19.60KJ/mol, and almost nil around the required energy of Si-O key rotation.
6. it is low to melt the body viscosity, the forming process good fluidity.
Because above excellent properties, organosilicon not only can be used as a kind of base mateiral, structured material, and main is can be used as accessory agent or shared or improve the processing performance of other material with other material.
In the present invention, organosilicon modifier is used for ultrahigh molecular weight polyethylene(UHMWPE), its add-on is generally the 3-15% of total amount.And the oxidation inhibitor that uses in the present invention can be antioxidant 1010, or phenolic antioxidant such as B215, and its add-on is generally the 0.1-2% of raw material blending ingredients.
The first embodiment of the present invention:
90 parts ultrahigh molecular weight polyethylene(UHMWPE) powder and 10 parts of organosilicon modifiers and 0.5 part of antioxidant 1010 are mixed, and oven dry is about 6 hours in 50 ℃ of drying bakers, carries out granulation with single screw rod or twin screw extruder, the fervent or pelletizing after water cooling of batten.Processing condition are as follows:
Ultrahigh molecular weight polyethylene(UHMWPE) PP Pipe Compound extrusion temperature table 1
I. feeding section ℃ II. compression section ℃ III. homogenizing zone ℃ IV. the outlet ℃
200 240 280 250
The tensile yield strength MPa:22.92 of obtained PP Pipe Compound, tensile break strength MPa:35.01, shock strength KJ/m 2: constantly, kinetic friction coefficient: 0.05.
The second embodiment of the present invention
92 parts of ultrahigh molecular weight polyethylene(UHMWPE) powder and 8 parts of organosilicon modifiers and 0.2 part of oxidation inhibitor B215 are mixed, and 50 ℃ of oven dry are about 6 hours in vacuum drying oven, carry out granulation with single screw rod or twin screw extruder, the fervent or pelletizing after water cooling of batten.Processing condition are as follows:
Ultrahigh molecular weight polyethylene(UHMWPE) PP Pipe Compound extrusion temperature table 2
I. feeding section ℃ II. compression section ℃ III. homogenizing zone ℃ IV. the outlet ℃
220 260 300 260
The performance of above gained PP Pipe Compound: tensile yield strength MPa:23.66, tensile break strength MPa:30.49, shock strength KJ/m 2: constantly, kinetic friction coefficient: 0.07.
Utilize the ultra-high molecular weight polyethylene blend of the method preparation of the invention described above, its processing fluidity is greatly improved, and obtains unusual effect.Experimental results show that, the present invention is prepared extrudes, the injection stage PP Pipe Compound, adopt common equipment just can carry out forming process easily, not only keep raw-material tensile strength and shock strength, and reduce a lot than former ultra-high molecular weight polyethylene product frictional coefficient, wear resistance improves a lot, and can produce high-performance, high-quality goods.This be because organosilicon modifier can effectively solve in the ultrahigh molecular weight polyethylene(UHMWPE) course of processing occur easily melt the body splintering problem, the processing fluidity of unmodified resin is significantly improved.Be embodied in mould fill good, extrude moment reduction, internal lubrication and release property and improve the few warpage of goods etc.Can significantly reduce simultaneously the energy expenditure of processing units, prolong the work-ing life of processing units.Compare with former intermittent type sintering process, can reduce investment outlay, shorten the production cycle, enhance productivity, have tangible economic benefit and social benefit.
Utilize PP Pipe Compound of the present invention, can produce the pipeline of high abrasion, be widely used in: industry pipelines such as electric power, metallurgy, grain processing, various mine ore dressing and mine tailing conveying, oil and gas conveying, town gas conveying, organic chemical industry and inorganic chemical industry, snagboat sediment transport, coal washery, colliery, coal water slurry conveying, marine chemical industry (salt, halogen, alkali), tap water main pipe, sewage disposal, to substitute former steel pipe (corrode easily and wear and tear), application potential is very huge.As fuel-burning power plant ash transfer pipe, because of the calcium oxide in the delivery medium, magnesium oxide, aluminium sesquioxide and multiple acid ion etc. and very easily fouling obstruction of steel pipe generation electrochemical action.With this material conduit non flouling behaviour and improve wear resistance then, and transporting resistance reduces, and obvious energy conservation can effectively increase the service life and save cleaning charge and use.In addition, as grain processing plant, the former steel pipe of using can be worn out about 3 months, and have heavy metal ion to sneak into; And use this material conduit, the several times that can increase the service life, and reduce noise, the heavy metal free ion is sneaked into, or the like.

Claims (4)

1, a kind of ultra-high molecular weight polyethylene blend, it is characterized in that, adopt organosilicon to form blend composition as the Modification of UHMWPE agent, its component comprises ultrahigh molecular weight polyethylene(UHMWPE) 85-97%, organosilicon 3-15%, oxidation inhibitor 0.2-2%, the weight percent sum of each component is 100%.
According to the described ultra-high molecular weight polyethylene blend of claim 1, it is characterized in that 2, described oxidation inhibitor is phenolic antioxidant, described phenolic antioxidant is antioxidant 1010 or B215.
3, a kind of preparation method who is suitable for the ultra-high molecular weight polyethylene blend extruding and inject, it is characterized in that, may further comprise the steps: with raw material with following weight percent mixing: ultrahigh molecular weight polyethylene(UHMWPE) 85-97%, polysiloxane 3-15%, oxidation inhibitor 0.2-2%, the weight percent sum of each component is 100%; Said mixture is stirred, in vacuum drying oven, dried 5-7 hour for 40-60 ℃; The raw material of drying is carried out extruding pelletization, and its extrusion temperature is: feed zone: 200-240 ℃, and compression section: 240-260 ℃, homogenizing zone: 260-320 ℃, outlet: 250-300 ℃.
According to the described method of claim 3, it is characterized in that 4, described oxidation inhibitor is phenolic antioxidant, described phenolic antioxidant is antioxidant 1010 or B215.
CNB011301619A 2001-12-28 2001-12-28 Organic silicon/ultra-high molecular weight polyethylene blend and its preparation method Expired - Fee Related CN1156528C (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105482233A (en) * 2016-01-27 2016-04-13 广东省南粤交通揭惠高速公路管理中心 Ultrahigh molecular weight polyethylene composition for extrusion molding escape pipeline

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103012905B (en) * 2011-09-22 2015-03-18 中国石油化工股份有限公司 Colored polyethylene composition and colored polyethylene sheet material
GB201220099D0 (en) * 2012-09-19 2012-12-26 Dow Corning Production of blend of polyolefin and organopolysiloxane
CN103789860A (en) * 2012-10-30 2014-05-14 中国石油化工股份有限公司 High molecular weight polyethylene fiber, preparation method and application thereof
CN107266772A (en) * 2017-08-01 2017-10-20 合肥康之恒机械科技有限公司 A kind of sports protective equipment material and preparation method thereof
CN111892775A (en) * 2020-08-18 2020-11-06 闫镇达 Polypropylene-siloxane blending lipophilic special material and preparation method thereof
CN112709869A (en) * 2020-11-24 2021-04-27 六安中财管道科技有限公司 Wear-resistant steel wire mesh framework composite pipe and preparation process thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105482233A (en) * 2016-01-27 2016-04-13 广东省南粤交通揭惠高速公路管理中心 Ultrahigh molecular weight polyethylene composition for extrusion molding escape pipeline
CN105482233B (en) * 2016-01-27 2017-12-29 广东省南粤交通揭惠高速公路管理中心 A kind of ultra-high molecular weight polyvinyl composite for extrusion molding pipe for escaping

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