CN1244626C - Composite of polyethylene with low viscosity ultra high moleculer weight and preparation process thereof - Google Patents
Composite of polyethylene with low viscosity ultra high moleculer weight and preparation process thereof Download PDFInfo
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Abstract
The present invention relates to a low-viscosity ultrahigh molecular weight polyethylene composition and a preparation method thereof, which is characterized in that 70 to 90 parts by weight of ultrahigh molecular weight polyethylene, 30 to 10 parts by weight of polypropylene, 0.03 to 0.8 part by weight of antioxidant, 0.2 to 2.0 parts by weight of lubricant and 1 to 15 parts by weight of compound auxiliary agents are added in a high-speed mixer and stirred for 2 to 5 minutes at a high speed; after homogeneously mixed, the mixture is granulated by a double screw extruder; the extrusion temperature is from 180 DEG C to 230 DEG C. The ultrahigh molecular weight polyethylene composition obviously reduces the viscosity, increases the critical shear rate, effectively improves the processing rheological property of the ultrahigh molecular weight polyethylene, can be processed into a product by the ordinary molding, extrusion and injection molding, has good comprehensive property, especially has impact property basically maintained unchanged, and has obvious economic benefits and social benefits.
Description
One, technical field
The present invention relates to a kind of low viscosity ultra-high molecular weight polyvinyl composite and preparation method thereof, belong to the manufacture field of polymer materials.
Two, background technology
Ultrahigh molecular weight polyethylene(UHMWPE) is meant that generally viscosity-average molecular weight is at the linear polyethylene more than 1,500,000, have remarkable excellent comprehensive performances such as wear resistance, shock resistance, self lubricity, erosion resistance, dimensional stability and low temperature resistant stress cracking, can be applicable to numerous areas such as weaving, papermaking, grain processing, chemical industry, medical treatment, physical culture and military affairs.But, ultrahigh molecular weight polyethylene(UHMWPE) makes that its melt viscosity is high (to be about 10 because having high molecular weight and the random entanglement of macromole interchain height
9Pa.s) and critical shear rate is extremely low (is about 10
-2s
-1), generally can only adopt compacting-agglomerating forming method that it is processed.Ultrahigh molecular weight polyethylene(UHMWPE) forming process difficulty has influenced the actual of it to a great extent and has applied.
Chinese patent 98100960.3 has been reported liquid crystal polymer and other auxiliary agent that adds certainweight per-cent in ultrahigh molecular weight polyethylene(UHMWPE), the blend granulation, can make can be with common extruding and extruding and the injection grade super-high molecular weight polyethylene PP Pipe Compound that injection device is processed.This method utilizes the property of liquid crystal polymer to improve the processing fluidity of ultrahigh molecular weight polyethylene(UHMWPE), but required liquid crystal polymer large usage quantity (consumption is between 10 parts to 30 parts among the embodiment), and compare with polyvinyl resin with super-high molecular weight, liquid crystal polymer costs an arm and a leg, and processing temperature is also higher.
Chinese patent 01100016.3 report will have ad hoc structure earlier and the cation exchange capacity clay mixes with intercalator, carry out intercalation processing for 60～120 ℃ in temperature, clay dispersion after will handling then is in specific dispersion medium, stir in high speed kneader high speed with ultrahigh molecular weight polyethylene(UHMWPE) again, carry out situ-formed graft intercalation process in 80～130 ℃ of temperature, the nm composite material of ultra-high-molecular polyethylene and clay that obtains can be used traditional extruding with the injection moulding mode and process.This method utilizes between the layered silicate lamella frictional coefficient little, be dispersed in the ultrahigh molecular weight polyethylene(UHMWPE) equably, when melt, relative slippage between the silicate lamella, reduced the unordered entanglement between the ultrahigh molecular weight polyethylene(UHMWPE) macromole, on the basis that keeps the original excellent properties of ultrahigh molecular weight polyethylene(UHMWPE) basically, reached the purpose of improving the ultrahigh molecular weight polyethylene(UHMWPE) processing characteristics.But this method all has particular requirement to particle diameter, crystalline structure, the cation exchange capacity of used clay, intercalation processing reaches and ultrahigh molecular weight polyethylene(UHMWPE) recombination process complexity, and the addition of clay could effectively improve the rheological of ultrahigh molecular weight polyethylene(UHMWPE) when big.The production technology cost is also higher.
Japanese Patent JP6055042, JP6042078, low molecular weight polyethylene and super-high molecular weight polythene blending were to improve its mobile method during U.S. Pat 4281070 had been reported and used.The principle of these class methods is: low molecular weight polyethylene is the liquid phase with good fluidity in more than fusing point, and ultrahigh molecular weight polyethylene(UHMWPE) then suspends on it, and blend can be extruded with injection moulding and process.Its shortcoming be general in the add-on big (more than 30%) of low molecular weight polyethylene, the mechanical property of blend descends very big than ultrahigh molecular weight polyethylene(UHMWPE), and has limited purposes.
Three, summary of the invention
The objective of the invention is provides a kind of low viscosity ultra-high molecular weight polyvinyl composite and working method thereof at the deficiencies in the prior art, be characterized on Chinese patent 02133674.1 basis of present inventor's application, introducing efficient composite assistant, more effectively improve the processing fluidity of ultrahigh molecular weight polyethylene(UHMWPE), and kept ultrahigh molecular weight polyethylene(UHMWPE) excellent comprehensive performance.
Purpose of the present invention is realized that by following technical measures wherein raw materials used umber is parts by weight except that specified otherwise.
The recipe ingredient of low viscosity ultra-high molecular weight polyvinyl composite is:
Ultrahigh molecular weight polyethylene(UHMWPE), 70～90 parts
30～10 parts of polypropylene
0.03～0.8 part in oxidation inhibitor
0.2～2.0 part of lubricant
1～15 part of composite assistant
Wherein, the ultrahigh molecular weight polyethylene(UHMWPE) molecular weight is 200 to 4,000,000; Polypropylene is a homopolymerization type polypropylene, melting index (MI) 〉=2.0g/10min;
Oxidation inhibitor is at least a in four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, β-(4-hydroxyl-3,5-di-tert-butyl-phenyl) positive octadecyl ester of propionic acid or tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester;
Lubricant is any in stearic acid, calcium stearate, Zinic stearas or the stearic amide;
Composite assistant is any in polyoxyethylene glycol and diatomite or polyoxyethylene glycol and the glass microballon.Wherein the molecular weight of polyoxyethylene glycol is 2000～20000, and the particle diameter of diatomite and glass microballon is 0.2 μ m～20 μ m.
The preparation method of low viscosity ultra-high molecular weight polyvinyl composite:
1, the preparation of composite assistant
With polyoxyethylene glycol and diatomite or polyoxyethylene glycol and glass microballon, with polyoxyethylene glycol: diatomite or polyoxyethylene glycol: the weight ratio of glass microballon=1: 2 to 1: 4 adds in the super mixer, airtight, in 70 ℃～100 ℃ high-speed stirring of temperature 5～30 minutes, cooling back discharging obtained composite assistant.
2. the preparation of low viscosity ultra-high molecular weight polyvinyl composite
With 70～90 parts of ultrahigh molecular weight polyethylene(UHMWPE)s, 30～10 parts of polypropylene, 0.03～0.8 part in oxidation inhibitor, 0.2～2 part of lubricant, composite assistant adds in the super mixer high-speed stirring 2～5 minutes for 1～15 part, using twin screw extruder granulation, extrusion temperature after mixing is 180 ℃～230 ℃.Pellet can be by mold pressing, extrude, goods are processed in injection moulding.
Test result shows, compares with the ultrahigh molecular weight polyethylene/polypropylene composition that does not add composite assistant, and be 11.52s in shearing rate
-1To 1152s
-1Scope, composition melt viscosity of the present invention obviously reduces, simultaneously over-all properties remains unchanged substantially.And pure ultra-high molecular mass polyethylene is in the test of the high pressure capillary rheometer of the same terms because melt viscosity is high and critical shear rate is extremely low, in shearing rate greater than 11.52s
-1Scope, almost can not get stable data.
The present invention has following advantage:
1, the ultra-high molecular weight polyvinyl composite melt viscosity significantly reduces, and critical shear rate improves, and has improved the processing rheological of ultrahigh molecular weight polyethylene(UHMWPE) effectively, can be with common mold pressing, extrude, injection molding process processes.
2, the good combination property of ultra-high molecular weight polyvinyl composite, particularly impact property remains unchanged substantially.
3, the composite assistant raw material sources are extensive, low price, and complex method is easy, helps suitability for industrialized production; Add a small amount of composite assistant and just can play the effect that reduces viscosity.
Four, embodiment
Below by embodiment the present invention is carried out concrete description; be necessary to be pointed out that at this present embodiment only is used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment according to the content of the invention described above.
Embodiment 1: at first be that the diatomite 200g that 2000 polyoxyethylene glycol 100g and median size are 0.2 μ m adds in the super mixer with molecular weight, airtight, in 80 ℃ of high-speed stirring of temperature 5 minutes, cooling back discharging, obtain composite assistant PPA1, be 2504 ± 500,000 ultrahigh molecular weight polyethylene(UHMWPE) 80g and polypropylene (F401) 20g, calcium stearate 1.0g, the four [β-(3 of MI=2.2g/10min then with molecular weight, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester 0.3g and composite assistant PPA1 1g mix, and uses double-screw extruding pelletizing.Its extrusion temperature each section from the opening for feed to the discharge port is followed successively by 1 section: room temperature-190 ℃, and 2 sections 180 ℃～220 ℃, 3 sections: 180 ℃～230 ℃, 4 sections: 180 ℃～220 ℃.The performance of gained pellet is detailed to be shown in Table 1.
Embodiment 2: the content of composite assistant PPA1 is become 3g, and all the other components and operational condition are with embodiment 1 in the prescription.The result does not see table 1 for details not.
Embodiment 3: the content of composite assistant PPA1 is become 6g, and all the other components and operational condition are with embodiment 1 in the prescription.The result is detailed to be shown in Table 1.
Embodiment 4: at first be that the glass microballon 200g that 10000 polyoxyethylene glycol 100g and median size are 5 μ m adds in the super mixer with molecular weight, airtight, in 90 ℃ of high-speed stirring of temperature 15 minutes, cooling back discharging, obtain composite assistant PPA2, be 250 ± 500,000 ultrahigh molecular weight polyethylene(UHMWPE) 80g and polypropylene (F401) 20g of MI=2.2g/10min then with molecular weight, stearic acid 1.5g, β-(4-hydroxyl-3, the 5-di-tert-butyl-phenyl) positive octadecyl ester 0.3g of propionic acid and tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester 0.2g and composite assistant PPA2 3g mix, and use double-screw extruding pelletizing.The granulation condition is with embodiment 1.Granule performance is detailed to be shown in Table 1.
Embodiment 5: the content of composite assistant PPA2 is become 6g, and all the other components and operational condition are with embodiment 4 in the prescription.The result is detailed to be shown in Table 1.
Embodiment 6: at first be that 20000 polyoxyethylene glycol 100g and median size are that 20 μ m glass microballon 400g add in the super mixer with molecular weight, airtight, in 100 ℃ of high-speed stirring of temperature 30 minutes, cooling back discharging, obtain composite assistant PPA3, be 350 ± 500,000 ultrahigh molecular weight polyethylene(UHMWPE) 80g and polypropylene (F401) 20g, stearic amide 2.0g, β-(the 4-hydroxyl-3 of MI=2.2g/10min then with molecular weight, the 5-di-tert-butyl-phenyl) positive octadecyl ester 0.8g of propionic acid and composite assistant PPA3 5g mix, and use double-screw extruding pelletizing.The granulation condition is with embodiment 1.Granule performance is detailed to be shown in Table 1.
Embodiment 7: the content of composite assistant PPA3 is become 10g, and all the other components and operational condition are with embodiment 6 in the prescription.The result is detailed to be shown in Table 1.
Embodiment 8: the content of composite assistant PPA3 is become 15g, and all the other components and operational condition are with embodiment 6 in the prescription.The result is detailed to be shown in Table 1.
Embodiment 9: the content of composite assistant PPA1 is become 3g, and ultrahigh molecular weight polyethylene(UHMWPE) content becomes 90g, and polyacrylic content becomes 10g, and all the other components and operational condition are with embodiment 1 in the prescription.The result is detailed to be shown in Table 1.
Embodiment 10: the content of composite assistant PPA1 is become 3g, and ultrahigh molecular weight polyethylene(UHMWPE) content becomes 70g, and polyacrylic content becomes 30g, and all the other components and operational condition are with embodiment 1 in the prescription.The result is detailed to be shown in Table 1.
Comparative Examples 1: do not add composite assistant, all the other components and operational condition are with embodiment 1 in the prescription.Result such as table 2.
Comparative Examples 2: do not add composite assistant, ultrahigh molecular weight polyethylene(UHMWPE) content becomes 90g, and polyacrylic content becomes 10g, and all the other components and operational condition are with embodiment 1 in the prescription.The result is detailed to be shown in Table 2.
Comparative Examples 3: do not add composite assistant, ultrahigh molecular weight polyethylene(UHMWPE) content becomes 70g, and polyacrylic content becomes 30g, and all the other components and operational condition are with embodiment 1 in the prescription.The result is detailed to be shown in Table 2.
Comparative Examples 4: composite assistant is become flow ability modifying agent ultra-high molecular weight silicone MB 50-002, and its content becomes 1g, and other component and operational condition are with embodiment 1 in the prescription.The result is detailed to be shown in Table 2.
Comparative Examples 5: composite assistant is become flow ability modifying agent ultra-high molecular weight silicone MB 50-002, and its content becomes 1g, and other component and operational condition are with embodiment 1 in the prescription.The result is detailed to be shown in Table 2.
Comparative Examples 6: composite assistant is become silicone plastics additive GM-100, and its content becomes 0.5g, and other component and operational condition are with embodiment 1 in the prescription.The result is detailed to be shown in Table 2.
Comparative Examples 7: composite assistant is become silicone plastics additive GM-100, and its content becomes 1g, and other component and operational condition are with embodiment 1 in the prescription.The result is detailed to be shown in Table 2.
Comparative Examples 8: as a comparison case, composite assistant is become silicone plastics additive GM-100, its content becomes 2g, and other component and operational condition are with example 1 in the prescription.The result is detailed to be shown in Table 2.
The test result of embodiment 1-10 and Comparative Examples 1-8 shows:
1, compare with the ultrahigh molecular weight polyethylene/polypropylene composition that does not add composite assistant, ultra-high molecular weight polyvinyl composite of the present invention is in very wide range of shear rate, and melt viscosity obviously reduces, and has low viscous characteristics.Simultaneously over-all properties is approaching or remain unchanged with the former.
2, can improve common plastics and process the ultra-high molecular weight silicone additive of rheological does not reduce viscosity to the ultrahigh molecular weight polyethylene/polypropylene composition effect.The present invention adopts the composite assistant of polyoxyethylene glycol and diatomite or polyoxyethylene glycol and glass microballon composition, the ultrahigh molecular weight polyethylene/polypropylene composition is had the effect of tangible reduction viscosity.
3, pure ultra-high molecular mass polyethylene is in the test of the high pressure capillary rheometer of the same terms because melt viscosity is high and critical shear rate is extremely low, in shearing rate greater than 11.52s
-1Scope, almost can not get stable data.Ultra-high molecular weight polyvinyl composite of the present invention is at whole range of shear rate (11.52s
-1To 2880s
-1), all can obtain stable data, illustrate that its critical shear rate significantly improves than pure ultra-high molecular mass polyethylene.
Table 1 embodiment 1-10 experimental result
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Composite assistant | PPA1 | PPA1 | PPA1 | PPA2 | PPA2 | PPA3 | PPA3 | PPA3 | PPA1 | PPA1 |
| The composite assistant content g | 1 | 3 | 6 | 3 | 6 | 5 | 10 | 15 | 3 | 3 |
| The UHMWPE content g | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 90 | 70 |
| The PP content g | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 10 | 30 |
| Apparent viscosity Pa.s (11.52s -1) | 5827 | 3189 | 2711 | 3173 | 2225 | 4271 | 3565 | 2359 | 4969 | 2649 |
| Apparent viscosity Pa.s (115.2s -1) | 1109 | 674.5 | 512 | 504.4 | 374.3 | 615.7 | 765.6 | 371.0 | 904.8 | 691.3 |
| Apparent viscosity Pa.s (1152s -1) | 244.8 | 211.9 | 178.0 | 174.2 | 107.1 | 231.0 | 204.0 | 106.0 | 210.5 | 181.7 |
| Notched Izod impact strength kJ/m 2 | 95.1 | 90.0 | 83.2 | 95.0 | 88.3 | 100.6 | 107.2 | 81.7 | 103.1 | 49.5 |
| Tensile strength MPa | 34.2 | 32.8 | 31.1 | 32.3 | 31.6 | 32.0 | 30.1 | 28.4 | 36.5 | 26.4 |
| Polishing scratch width mm | 5.19 | 5.29 | 5.40 | 4.88 | 4.94 | 5.18 | 5.73 | 5.77 | 5.63 | 5.86 |
| The sassafras coefficient rubs | 0.142 | 0.138 | 0.190 | 0.140 | 0.148 | 0.145 | 0.188 | 0.20 | 0.139 | 0.23 |
Table 2 Comparative Examples 1-8 experimental result
| Comparative Examples | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Composite assistant | MB 50-002 | MB 50-002 | GM -100 | GM -100 | GM -100 | |||
| The composite assistant content g | 1 | 2 | 0.5 | 1 | 2 | |||
| The UHMWPE content g | 80 | 90 | 70 | 80 | 80 | 80 | 80 | 80 |
| The PP content g | 20 | 10 | 30 | 20 | 20 | 20 | 20 | 20 |
| Apparent viscosity Pa.s (11.52s -1) | 6438 | 5619 | 6071 | 6893 | 6556 | 6549 | 6616 | 6011 |
| Apparent viscosity Pa.s (115.2s -1) | 1567 | 1909 | 1370 | 1539 | 1495 | 1601 | 1568 | 1625 |
| Apparent viscosity Pa.s (1152s -1) | 248.6 | 232.0 | 214.0 | 240.1 | 239.6 | 244.4 | 250.5 | 271 |
| Notched Izod impact strength kJ/m 2 | 86.2 | 104.6 | 52.6 | 104.7 | 99.3 | 99.8 | 94.0 | 97.1 |
| Tensile strength MPa | 35.3 | 39.1 | 27.2 | 30.5 | 29.0 | 29.5 | 31.48 | 28.53 |
| Polishing scratch width mm | 4.98 | 5.7 | 5.9 | |||||
| The sassafras coefficient rubs | 0.128 | 0.13 | 0.21 |
● apparent viscosity is measured temperature with Rheograph 2002 (GOTTFERT) type high pressure capillary rheometer: 210 ℃, and capillary die major diameter ratio: 30.Range of shear rate: 11.52s
-1To 2880s
-1Pure ultra-high molecular mass polyethylene in shearing rate greater than 11.52s
-1Scope, can't obtain stable data.
● notched Izod impact strength is tested experimental temperature by the GB1843-80 standard on XJ-40A impact experiment machine: 23 ℃.
● tensile strength is tested draw speed by the GB1040-79 standard on Instron 4302 type universal testing machines: 100mm/min, experimental temperature: 23 ℃.
● frictional wear experiment carries out on MM-200 type wear testing machine.
Claims (4)
1. low viscosity ultra-high molecular weight polyvinyl composite is characterized in that the recipe ingredient of said composition is by weight:
70～90 parts of ultrahigh molecular weight polyethylene(UHMWPE)s
30～10 parts of polypropylene
0.03～0.8 part in oxidation inhibitor
0.2～2.0 part of lubricant
1～15 part of composite assistant
Wherein, composite assistant is any in polyoxyethylene glycol and diatomite or polyoxyethylene glycol and the glass microballon.
2. low viscosity ultra-high molecular weight polyvinyl composite according to claim 1, it is characterized in that oxidation inhibitor is four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, β-(4-hydroxyl-3, the 5-di-tert-butyl-phenyl) at least a in positive octadecyl ester of propionic acid or tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester.
3. low viscosity ultra-high molecular weight polyvinyl composite according to claim 1 is characterized in that lubricant is any in stearic acid, calcium stearate, Zinic stearas or the stearic amide.
4. as the preparation method of low viscosity ultra-high molecular weight polyvinyl composite as described in one of claim 1～3, it is characterized in that:
(1) preparation of composite assistant
With polyoxyethylene glycol and diatomite or polyoxyethylene glycol and glass microballon, with polyoxyethylene glycol: diatomite or polyoxyethylene glycol: the weight ratio of glass microballon=1: 2 to 1: 4 adds in the super mixer, and was airtight, in 70 ℃～100 ℃ high-speed stirring of temperature 5～30 minutes, cooling back discharging obtains composite assistant
(2) preparation of low viscosity ultra-high molecular weight polyvinyl composite
With ultrahigh molecular weight polyethylene(UHMWPE) 70～90 weight parts, polypropylene 30～10 weight parts, oxidation inhibitor 0.03～0.8 weight part, lubricant 0.2～2 weight part, composite assistant 1～15 weight part adds in the super mixer, high-speed stirring 2～5 minutes, using twin screw extruder granulation, extrusion temperature after mixing is 180 ℃～230 ℃.
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|---|---|---|---|
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|---|---|---|---|
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|---|---|
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| CN1244626C true CN1244626C (en) | 2006-03-08 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1919915B (en) * | 2005-08-26 | 2010-10-13 | 海尔集团公司 | Modified polypropylene material for refrigerator and manufacture method thereof |
| CN100371379C (en) * | 2006-03-28 | 2008-02-27 | 四川大学 | Ultrahigh molecular weight polyethylene composition capable of being extrusion molded and its prepn process |
| CN102585332B (en) * | 2012-02-27 | 2013-10-30 | 江苏科技大学 | Modified ultra-high molecular weight polyethylene material |
| CN104045899B (en) * | 2014-06-19 | 2016-06-01 | 江门市道生工程塑料有限公司 | There is superhigh molecular weight polyethylene material and its preparation method of processing fluidity |
| CN104045898B (en) * | 2014-06-19 | 2016-06-01 | 江门市道生工程塑料有限公司 | A kind of superhigh molecular weight polyethylene material and its preparation method |
| CN104212035A (en) * | 2014-09-05 | 2014-12-17 | 扬州巨业耐磨复合材料有限责任公司 | Processing method of high-strength self-lubricating ultra-high molecular weight polyethylene wear-resistant composite pipe |
| CN105905531B (en) * | 2016-06-02 | 2019-01-18 | 黑龙江天地承尚科技有限公司 | A kind of intermediate channel of scratch board conveyor and preparation method thereof |
| CN105947546A (en) * | 2016-06-02 | 2016-09-21 | 长春天地聚氨酯科技有限公司 | Double-chain scraper on edge of scraper conveyor |
| CN113881122B (en) * | 2021-09-23 | 2023-10-31 | 上海金发科技发展有限公司 | Ultra-high molecular weight polyethylene composition capable of being injection molded and preparation method and application thereof |
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