CN102850735B - PBT/ASA composition with high conductivity, and preparation equipment, preparation method and application thereof - Google Patents
PBT/ASA composition with high conductivity, and preparation equipment, preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a conductive composition, and a preparation method and application thereof, and in particular relates to a PBT / ASA composition with high conductivity, and preparation equipment, a method and application thereof. The composition has surface resistivity of 103-105 ohm/ sq, and is prepared from 21-58 wt% of PBT, 9-13 wt% of ASA, 2-3 wt% of an ethylene-acrylate-glycidyl methacrylate ternary copolymer, 15-37 wt% of an intermediate, 0-0.3 wt% of a carbon nanotube dispersing agent and 10-30% of the alkali-free glass fiber, through blend extrusion by a double screw extruder. The intermediate comprises 10-20% of carbon nanotubes, 79-89 wt% of PBT and 0.2-1 wt% of a carbon nanotube dispersing agent, and has a surface resistivity of 100-101 ohm / sq. The carbon nanotube in the composition prepared by the invention can be uniformly dispersed in a continuous phase (PBT) system to form a stable conductive network, without local accumulation or surface accumulation. The composition can be used for the production of a conductive roller in a currency count machine and a laser printer.
Description
[technical field]
The present invention relates to electrically conductive composition and Preparation equipment thereof, methods and applications, particularly a kind of composition of the high conductivity that contains PBT/ASA that conducts electricity level and Preparation equipment thereof, methods and applications.
[background technology]
Be applied at present the conductive rollers (material strengthens PBT for conduction) on financial instrument (as: paper money counter) and laser printer, basically by the PBT resin, add graphite, metal powder, conductive carbon black, carbon fiber, carbon nanotube etc. wherein one or more hybrid conductive media obtain, wherein graphite, metal powder, conductive carbon black, because addition large (10～20%) causes toughness of material bad, easily ftracture; Carbon fiber causes the cost performance of material unreasonable because unit price is expensive;
And carbon nanotube (CNT), the Nano-graphite Crystals of tubulose, be the single or multiple lift graphite flake around central shaft by the curling seamless nano level pipe formed of certain helix angle, the C of every layer is SP2 hydridization, forms the cylindrical surface on hexagon plane; Due to its unique electricity, optics and mechanical characteristics, carbon nanotube all has broad application prospects in fields such as physics, chemistry, information technology, environmental science, Materials science, energy technology, life and medical sciences; Just because of this potential value of carbon nanotube and application prospect widely, make the research of relevant carbon nano tube compound material become one of research field of greatest concern.
From current domestic disclosed patent documentation, the domestic study on the synthesis to carbon nanotube is paid special attention to, and the application and development of carbon nanotube is quite lagged behind, as patent CN102532823A, although added carbon nanotube 1～7%, the surface resistivity of material or higher (10
6～10
10Ω/sq), antistatic-level can only be belonged to, conduction level (10 can not be belonged to
0～10
5Ω/sq), trace it to its cause and be that the applied research to carbon nano tube compound material is deep not enough.
In the process of routine use paper money counter or laser printer, the phenomenon such as people often find that paper money counter occurs in high speed counting process that number is made mistakes, card machine, bill are overlapping and laser printer also there will be the phenomenons such as writing sharpness heterogeneity, hanging togother in print procedure, the conductive rollers that is paper money counter and laser printer of tracing it to its cause can produce a large amount of static electric charges with the paper friction when high speed scroll, and a large amount of static electric charges is deposited on conductive rollers and can't eliminates fast by conductive rollers, will cause above-described phenomenon to occur.The surface resistivity of the conduction rod of domestic production at present is substantially 10
6～10
10Ω/sq, belong to antistatic-level, do not reach the conduction level, and the surface resistivity of the conductive rollers of the paper money counter of external import (Japan or Germany) or laser printer is 10
3～10
4Ω/sq, belong to the conduction level, and therefore there is very large gap in the surface resistivity of at present domestic conductive rollers and imported materials and items.
Carbon nanotube (CNT), the Nano-graphite Crystals of tubulose, be the single or multiple lift graphite flake around central shaft by the curling seamless nano level pipe formed of certain helix angle, the C of every layer is SP2 hydridization, forms the cylindrical surface on hexagon plane.Carbon nanotube can be single-walled nanotube or many walls nanotube, has two or more pipes of concentric wall usually, diameter 1～50nm, and length 1～100 μ m, have very large length-to-diameter ratio.The geometrical shape of carbon nanotube has straight, crooked or bending, and carbon nanotube generally exists with the composition forms of these geometrical shapies; Also there is the carbon nanotube of some types to be existed by the form with winding or boundling simultaneously, be that their mats become larger structure, but size still belongs to nano level, form is the spitting image of the scouring pad in our daily life or Steel Wool, special needs to be pointed out is this larger structure often contain quantity larger amorphous carbon.Based on the above, the carbon nanotube stable dispersion is at PBT/ASA composition system (PBT: polybutylene terephthalate, ASA: vinylformic acid-styrene-acrylonitrile copolymer) and form that stable conductive network structure not can realize easily, reason is between carbon nanotube to exist this generally acknowledged phenomenon of strong magnetism to cause, the result of strong magnetism can cause carbon nanotube to trend towards being the appurtenant form existence of nanotube, and the appurtenant of this nanotube is difficult to disperse.
[summary of the invention]
Can't be dispersed in order to solve carbon nanotube in prior art the problem that causes the material poorly conductive in the PBT/ASA composition system, the invention provides a kind of conduction level PBT/ASA composition and method of making the same and application of dispersed carbon nanotube.
For achieving the above object, at first the present invention provides a kind of PBT/ASA composition with high conductivity, and described compositions table surface resistivity is 10
3～10
5Ω/sq, said composition is grouped into by the one-tenth that accounts for following composition weight per-cent,
Described intermediate is that the carbon nanotube that accounts for intermediate weight percent 10～20%, 79～89% PBT and 0.2～1% carbon nanotube dispersed agent form, and the surface resistivity of described intermediate is 10
0～10
1Ω/sq.
Above-mentioned composition can access surface resistivity 10
3～10
5Ω/sq, reached the level of conduction level; Carbon nanotube disperses equably in composition, and disperse phase (carbon nanotube) is evenly dispersed in external phase (PBT) system, and has formed stable conductive network structure, not there will be the phenomenon of local accumulation or surface sediment.
Above-mentioned composition also has following screening formulation:
The limiting viscosity of described PBT routine: 0.83～1.3dl/g, be preferably 1.0dl/g, and conventional melting index MFI:9～60 g/10min, be preferably 20～25 g/10min; PBT limiting viscosity for the preparation of intermediate is preferably 0.83 dl/g, and melting index MFI is preferably 52～60g/10min, is conducive to improve the dispersiveness of carbon nanotube in the PBT system;
Described ASA(acrylonitrile-styrene-acrylic copolymer) conventional melting index: 7～35g/10min, be preferably 20～25 g/10min;
Described PBT/ASA composition can improve the dimensional stability (or dimensional precision) of PBT, low warpage, surface smoothness, the performances such as uvioresistant, but belong to half compatible system, need to add compatilizer, such as: one or more in ASA grafted maleic anhydride, ASA-copolymer-maleic anhydride, ethylene-acrylate-methyl propenoic acid glycidyl fat terpolymer etc. are preferably ethylene-acrylate-methyl propenoic acid glycidyl fat terpolymer;
PBT(in described PBT/ASA composition system is containing the PBT in intermediate) be preferably PBT:ASA=85:15 with the weight proportion of ASA, improve as far as possible rigidity and the surface smoothness of PBT/ASA composition on the basis of the dimensional precision that meets conductive rollers itself (or warpage properties).
Described carbon nanotube is preferably multi-walled carbon nano-tubes, diameter 5～50nm, length 1～20 μ m;
Described carbon nanotube accounts for 3～4.5% of composition total weight.
Described carbon nanotube dispersed agent is one or more in silicone powder, polyterephthalate or peptide, preferably the silicone powder;
Described silicone powder is the lubricant of PBT/ASA composition system and the dispersion agent of carbon nanotube.
The present invention also comprises a kind of equipment for the preparation of the above-mentioned required intermediate of PBT/ASA composition, comprise twin screw extruder, twin screw extruder is provided with screw rod, screw rod is divided into preheating section, fluxing zone, shearing section and extruding zone, the different threaded block arrangement architecture according to the function setting of each section, shearing section, to be provided with angle be 60
0or 90
0kneading block, extruding zone is provided with the transfer block of little helical pitch or large helical pitch, it is characterized in that being provided with 2～3 groups of oblique type toothed disc in described shearings section, to replace conventional angle be 60
0or 90
0kneading block, extruding zone is provided with the transfer block that 2～3 groups of straight type toothed disc replace little helical pitch or large helical pitch.
Can provide better shearing resistance for present design prepares intermediate through the twin screw extruder after improvement, disperse phase (carbon nanotube) is evenly dispersed in external phase (PBT) system, and formed stable conductive network structure, not there will be the phenomenon of local accumulation or surface sediment.
The present invention also comprises a kind of preparation method of above-mentioned composition, and the method comprises the following steps:
A. gas phase is pulverized the described carbon nanotube that accounts for intermediate content 10～20% 180～240 minutes, by the carbon nanotube of pulverizing, the PBT that accounts for intermediate gross weight 79 ~ 89% and 0.2 ~ 1% carbon nanotube dispersed agent by the granulation of described equipment blending extrusion, each section temperature range of forcing machine: 225～255 ℃, screw speed is 300～400r/min, obtain described intermediate
Described carbon nanotube is pulverized the content of the length-to-diameter ratio can effectively reduce carbon nanotube and larger structure by the high speed gas phase;
The adjustment of above-mentioned screw flight piece arrangement architecture will be according to the physical property (280 ℃ of heat decomposition temperatures) of PBT material, in the situation that guarantee that serious thermal destruction does not occur PBT, determine concrete model and the particular location of oblique type toothed disc, the quantity of straight type toothed disc and the kneading block be replaced, transfer block.
After the carbon nanotube dispersed agent that b. will account for intermediate, 21～58% PBT, 9～13% the ASA of composition total weight 15～37%, 2～3% ethylene-acrylate-glycidyl methacrylate terpolymer, 10～30% alkali free glass fibre and 0～0.3% mixes by conventional twin screw extruder blending extrusion granulation, each section temperature range of forcing machine: 225～250 ℃, screw speed is 300～400r/min, and obtaining surface resistivity is 10
3～10
5the described composition of Ω/sq.
The method has fully used existing resource to be improved, improve the shearing resistance of screw rod, the appurtenant of forcing carbon nanotube, the mat of various geometric shapes to become larger structure, carbon nanotube forms stable and dispersion uniformly in the PBT of intermediate; At first pulverize carbon nanotube and carry out high-shear melting dispersion with PBT, by carbon nanotube dispersed in the PBT of intermediate, and then by intermediate and other compositions, the mode by melting mixing forms composition again, and carbon nanotube can be dispersed in the PBT/ASA composition uniformly.
Aforesaid method also has following preferred version:
In described step a, each section extrusion temperature of twin screw extruder is 225 ℃, 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 255 ℃, 250 ℃, 250 ℃, 245 ℃, and screw speed is 400r/min;
In described step b, each section extrusion temperature of twin screw extruder is 250 ℃, 245 ℃, 240 ℃, 235 ℃, 230 ℃, 225 ℃, 230 ℃, 235 ℃, 240 ℃, 245 ℃, screw speed: 300 r/min;
In described step a, described PBT and described carbon nanotube dispersed agent enter the twin screw extruder blending extrusion granulation of repacking again with described carbon nanotube after first stirring by homogenizer.
Above-mentioned composition can be used for making the conductive rollers in paper money counter and laser printer.
[embodiment]
In order to make purpose of the present invention, technical scheme and advantage clearer, the present invention is further elaborated.Production unit in the application is all the common equipment of this area, should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The twin screw extruder that the present invention adopts improves and obtains on known structure, twin screw extruder is provided with screw rod, screw flight piece arrangement architecture is divided into preheating section, fluxing zone, shear section and extruding zone, the different threaded block arrangement architecture according to the function setting of each section, shear section and be provided with the kneading block that angle is 60 ° or 90 °, extruding zone is provided with the transfer block of little helical pitch or large helical pitch, after repacking: shear section and be provided with 2～3 groups of oblique type toothed disc and replace the kneading block that conventional angle is 60 ° or 90 °, extruding zone is provided with the transfer block that 2～3 groups of straight type toothed disc replace little helical pitch or large helical pitch, the twin screw extruder of this repacking is specifically designed to the preparation of intermediate.
One, the preparation of intermediate
1) multi-walled carbon nano-tubes of getting 3Kg carries out the pulverizing of high speed gas phase, and gas phase is pulverized after 240 minutes and emitted, and the side feeding barrel that joins twin screw extruder is standby;
2) open the head of parallel dual-screw extruding machine, pull out twin screw, in the shearing section of screw rod, take down the kneading block that 1 group of angle is 90 °, 2 groups of oblique type toothed disc are installed; Extruding zone at screw rod takes down 1 group little helical pitch transfer block, and 2 groups of straight type toothed disc are installed;
3) 16.9Kg PBT and 100g silicone powder are joined in homogenizer, by homogenizer, stir after 7 minutes and emit, the main feeding barrel that joins twin screw extruder is standby;
4) each section temperature of parallel dual-screw extruding machine is set as successively: 225 ℃, 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 255 ℃, 250 ℃, 250 ℃, 245 ℃, and screw speed: 400r/min;
5) according to production technique described above, set main feeding machine rotating speed 11r/min and side feeding machine rotating speed 18r/min in this forcing machine, main feeding machine and side feeding machine be continuous flow rate simultaneously, by the granulation of parallel dual-screw extruding machine blending extrusion, can obtain the midbody particle that content of carbon nanotubes accounts for intermediate weight percent 15%, standby by aluminium foil packing;
6) intermediate, the intermediate of the content of carbon nanotubes 15% that obtains are diluted to containing the PBT resin of 3% carbon nanotube and the mixture of intermediate, be injection molded into the standard batten by injection moulding machine respectively, its notch shock section is carried out to the SEM(scanning electronic microscope) take a picture and observe, be dispersed in the external phase system to even carbon nanotube, formed stable conductive network structure.The different test point (at least wanting 10 test point) according to the IEC60093 standard testing, the surface resistivity recorded is respectively 10
0-10
1Ω/sq and 10
3-10
4Ω/sq, the carbon nanotube dispersed in this explanation intermediate meets the requirement that strengthens the PBT/ASA composition system.Each of described injection moulding machine section temperature is followed successively by 225 ℃, 230 ℃, 235 ℃, 235 ℃.
Two, the preparation of the enhancing PBT/ASA composition of high conductivity
The proportioning of the weight percent of embodiment 1-6 and comparative example 1-2 is as follows:
Table one
After PBT, ASA are dried to 4 hours respectively in convection oven under 100 ℃ and 80 ℃, with ethylene-acrylate-methyl propenoic acid glycidyl fat terpolymer, silicone powder, intermediate (content of carbon nanotubes 15%), alkali free glass fibre, conductive carbon black, carbon fiber, by the weight percent shown in table one, mixed, parallel dual-screw extruding machine blending extrusion granulation by conventional, can obtain 8 finished products; 8 finished products are dried after 4 hours and are injection molded into the standard testing batten by injection moulding machine in convection oven under 120 ℃;
Each of described parallel dual-screw extruding machine section temperature is followed successively by: 250 ℃, 245 ℃, 240 ℃, 235 ℃, 230 ℃, 225 ℃, 230 ℃, 235 ℃, 240 ℃, 245 ℃, and screw speed: 300 r/min;
Each of described injection moulding machine section temperature is followed successively by 225 ℃, 230 ℃, 235 ℃, 235 ℃.
By the embodiment 1-6 that obtains and comparative example 1-2 batten, according to its mechanical property of ASTM standard testing and electrical property, test result is in Table two:
Table two
From the test result of table two, can draw:
1) embodiment 2-3, the content of carbon nanotubes that reaches the 23%(PBT/ASA composition system at the content of intermediate is 3.5%) time, the surface resistivity of the PBT/ASA composition system of glass fibre enhancing 10% has reached 5.79E+04 Ω/sq, belong to the conduction level, and the mechanical property performance is good, cost performance is good, but can not meet the rigidity requirement of conductive rollers material, and the surface resistivity of embodiment 1 belongs to antistatic-level and can not meet the mechanical property requirements of conductive rollers;
2) comparative example 1-3, in the PBT/ASA composition system of glass fibre enhancing 10%, content of carbon nanotubes is respectively 2.3%, 3.5%, 4.5%, surface resistivity is respectively 8.07E+08 Ω/sq, 5.79E+04 Ω/sq, 4.94E+04 Ω/sq, this explanation has just reached the seepage flow threshold values when content of carbon nanotubes is 3.5%, composition system has formed stable conductive network, along with the increase of content of carbon nanotubes on not significantly impact of the surface resistivity in composition system, and composition system can not form conductive network when content of carbon nanotubes is 2.3%, therefore not there will be to exceed and ooze phenomenon,
3) embodiment 5, when the content of intermediate reaches 30% (content of carbon nanotubes of PBT/ASA composition system is 4.5%), the surface resistivity of the PBT/ASA composition system of glass fibre enhancing 30% has reached 7.27E+04 Ω/sq, belong to the conduction level, and the mechanical property performance is good, meet the performance requriements of conductive rollers material, cost performance is better than embodiment 6, and the surface resistivity of embodiment 4 belongs to antistatic-level, can not meet the surface resistivity requirement of conductive rollers;
4) comparative example 4-6, in the PBT/ASA composition system of glass fibre enhancing 30%, content of carbon nanotubes is respectively 3.5%, 4.5%, 5.5%, surface resistivity is respectively 5.11E+06 Ω/sq, 7.27E+04 Ω/sq, 6.13E+04 Ω/sq, this explanation has just reached the seepage flow threshold values when content of carbon nanotubes is 4.5%, composition system has formed stable conductive network, along with the increase of content of carbon nanotubes on not significantly impact of the surface resistivity in composition system, and composition system can not be completed into conductive network when content of carbon nanotubes is 3.5%, therefore not there will be to exceed and ooze phenomenon,
5) comparative example 1-3 and embodiment 4-6, increase along with content of glass fiber, glass fibre in the PBT/ASA composition system is more and more obvious to the blocking effect of carbon nanotube, this just can find out from the content of carbon nanotubes that reaches the seepage flow threshold values, therefore, while adopting enhancing weighting material (as glass fibre, wollastonite etc.) that length-to-diameter ratio is larger with the carbon nanotube combination, just should consider to strengthen the blocking effect of weighting material to carbon nanotube;
6) comparative example 1, although conductive carbon black has added 12%, the surface resistivity of the PBT/ASA composition system of glass fibre enhancing 30% can only reach 5.76E+06 Ω/sq, belongs to antistatic-level, and mechanical property is poor, can not meet the performance requriements of conductive rollers material;
7) comparative example 2, and the surface resistivity of the PBT/ASA composition system of carbon fiber enhancing 30% has reached 3.53E+04 Ω/sq, belong to the conduction level, and the mechanical property performance is excellent, meet the performance requriements of conductive rollers material, but the cost performance costliness;
Comprehensive above the analysis, embodiment 5 meets the electrical property of conductive rollers and mechanical property requirements, content of carbon nanotubes in the PBT/ASA composition system only has 4.5% simultaneously, reached the seepage flow threshold values, belong to the conduction level, and cost performance is good, can be used for making the conductive rollers in paper money counter and laser printer, the replace imported material.
Claims (4)
1. the equipment for the preparation of the PBT/ASA composition, comprise twin screw extruder, twin screw extruder is provided with screw rod, screw rod is divided into preheating section, fluxing zone, shear section and extruding zone, the different threaded block arrangement architecture according to the function setting of each section, shear section and be provided with the kneading block that angle is 60 ° or 90 °, extruding zone is provided with little helical pitch or large helical pitch transfer block, it is characterized in that being provided with 2～3 groups of oblique type toothed disc and replacing the kneading block that conventional angle is 60 ° or 90 ° described the shearing on section, extruding zone is provided with the transfer block that 2～3 groups of straight type toothed disc replace little helical pitch or large helical pitch.
2. a method for preparing the PBT/ASA composition, comprise equipment claimed in claim 1, it is characterized in that the method comprises the following steps:
A. gas phase is pulverized the described carbon nanotube that accounts for intermediate content 10～20% 180～240 minutes, by the carbon nanotube of pulverizing, the PBT that accounts for intermediate gross weight 79～89% and 0.2～1% carbon nanotube dispersed agent by the granulation of described equipment blending extrusion, each section temperature range of forcing machine: 225～255 ℃, screw speed is 300～400r/min, obtain described intermediate
After the carbon nanotube dispersed agent that b. will account for intermediate, 21～58% PBT, 9～13% the ASA of composition total weight 15～37%, 2～3% ethylene-acrylate-glycidyl methacrylate terpolymer, 10～30% alkali free glass fibre and 0～0.3% mixes by conventional twin screw extruder blending extrusion granulation, each section temperature range of forcing machine: 225～250 ℃, screw speed is 300～400r/min, and obtaining surface resistivity is 10
3～10
5the described composition of Ω/sq.
3. the preparation method of PBT/ASA composition as claimed in claim 2, it is characterized in that in described step (a), each section extrusion temperature of twin screw extruder is 225 ℃, 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 255 ℃, 250 ℃, 250 ℃, 245 ℃, screw speed is 400r/min.
4. the preparation method of PBT/ASA composition as claimed in claim 2, it is characterized in that in described step (a), described PBT and described carbon nanotube dispersed agent enter twin screw extruder with described carbon nanotube again after first stirring by homogenizer and mix.
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| CN103435847A (en) * | 2013-09-02 | 2013-12-11 | 上海梵和聚合材料有限公司 | High-heat conductivity composite material for LED (light-emitting diode) lamp, heat-conducting filler and production equipment |
| CN108129794B (en) * | 2017-12-27 | 2022-05-31 | 上海统慧科技发展有限公司 | Styrene polymer-based conductive master batch based on carbon nanotube and graphene compound system and preparation method thereof |
| CN109021156A (en) * | 2018-07-25 | 2018-12-18 | 嘉兴华雯化工有限公司 | A kind of low yellowing styrene-acrylonitrile-copolymer-maleic anhydride and preparation method thereof |
| CN109836783A (en) * | 2018-12-29 | 2019-06-04 | 太仓市华鼎塑料有限公司 | A kind of antistatic fiber glass reinforced PBT/ASA composite material and preparation method thereof |
| TWI788009B (en) | 2021-09-13 | 2022-12-21 | 南亞塑膠工業股份有限公司 | Conductive polyester composition |
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| CN102532823B (en) * | 2010-12-30 | 2015-03-25 | 合肥杰事杰新材料股份有限公司 | Anti-static polybutylene terephthalate (PBT) material with excellent comprehensive performance and preparation method thereof |
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Effective date of registration: 20190115 Address after: Room 8-1, Building 9, 4888 Yuanjiang Road, Minhang District, Shanghai 201108 Patentee after: SHANGHAI PUGONG MATERIAL TECHNOLOGY CO., LTD. Address before: No. 701 Taogan Road, Sheshan Town, Songjiang District, Shanghai, 2010 Patentee before: Shanghai Tisma polymer composite material Co., Ltd. |