CN101508793A - Preparation method for filling polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material with hydrocarbon black - Google Patents
Preparation method for filling polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material with hydrocarbon black Download PDFInfo
- Publication number
- CN101508793A CN101508793A CNA2009100106791A CN200910010679A CN101508793A CN 101508793 A CN101508793 A CN 101508793A CN A2009100106791 A CNA2009100106791 A CN A2009100106791A CN 200910010679 A CN200910010679 A CN 200910010679A CN 101508793 A CN101508793 A CN 101508793A
- Authority
- CN
- China
- Prior art keywords
- epr
- conductive
- ntc
- parts
- pvc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a melt-bending preparation method for ultra-conductive carbon-black filled PVC/EPR foam conductive NTC material. The method takes ultra-conductive carbon-black (HG-1P) as conductive filler, PVC and EPR as polymer matrix, DOP as plasticizer, St as lubricant, AC as vesicant, Zn-St as foaming synergistic agent, DCP as cross-linking agent and Ca/Zn composite stabilizer as thermal stabilizer, adopts the melt-bending processing method to prepare PVC /EPR foam conductive NTC material and also studies foam structure and resistance-temperature characteristics of the composite material. The prepared conductive foam has ideal foam structure and strong NTC effect. The purpose is to improve the preparation process of the material and obtain the ultra-conductive carbon-black filled PVC/EPR foam conductive NTC material with stable NTC performance.
Description
Technical field:
The invention belongs to the polymer melt blend and prepare the functional polymer technology, particularly relate to a kind of employing polymer melt blend method and prepare the spy and lead carbon black (HG-1P) filling polyvinyl chloride (PVC)/ethylene-propylene rubber(EPR) (EPR) foam conductive negative temperature coefficient (NTC) preparation methods.
Background technology:
Polymer-based carbon compound-type conducting material is to be matrix with the high molecular polymer, and the conducting material that adds some amount has the processibility of macromolecular material and the electroconductibility of metal concurrently by the material that different recombining process constitutes.With the metallographic phase ratio, conductive composite material has that processibility is good, technology is simple, corrosion-resistant, advantage such as the resistivity variable range is big, price is low.
The principal item of conductive polymeric composite has: conductive plastics, conductive rubber, electro-conductive fiber fabric, electrically conducting coating, electro-conductive adhesive and transparent conductive film etc. can be used for electric parts, electrofax, circuit material, antistatic material, electromagnetic-field-shielded, optical recording and magnetic recording material etc.
Positive temperature coefficient (PTC) material of polymer-based carbon was widely used since 1975.Carbon black filled type electro-conductive material is most widely used a kind of in the present compound-type conducting material.The one, because carbon black is cheap practical; The 2nd, because carbon black can require to have bigger choice according to different conductions.Polymkeric substance/carbon black system resistivity can be in 10 Ω～10
10Adjust between the Ω, not only can eliminate and prevent static, can also be as face dress heating element, electromagnetic wave shielding and high conductor, electrode materials etc.The 3rd, the conduction lasting stability.The foam type conducting polymer composite can be used for the electrostatic protection of the packing of product, and the anti-electrostatic foam develops to permanent type conduction polyolefine direction from traditional impermanent type.Carbon black filled type electrical conduction mechanism can be explained with conduction energy band, tunnel effect and field emission.The foam type conducting polymer composite mainly utilizes its physical property, high thermal expansivity, surge capability and electroconductibility.The foam type conducting polymer composite is widely used in detecting static and eliminates electrostatic art.The foam type conducting polymer composite mainly utilizes its resistivity-temperature characteristics and switching characteristic, mainly shows as PTC, NTC effect.What the carbon black filled polymer-type electro-conductive material people that in the past developed were paid close attention to is the PTC performance of material, in the preparation process of material, always try every possible means to eliminate material and in temperature-rise period, produce the NTC behavior that takes place after the PTC behavior, and the preparation of NTC material is seldom related to; Moreover the carbon black filled polymer-type electro-conductive material of in the past being developed is the not solid material of foaming, and the carbon black filled polymer materials of the foam type of material-saving, light weight does not appear in the newspapers.Ptc material raises with temperature, and resistance changes from small to big, and becomes isolator by conductor, and what ptc material produced in temperature-rise period is the PTC effect.NTC is opposite with PTC, and along with the resistance decreasing of temperature rising material, what the NTC material produced in temperature-rise period is the NTC effect.Still there is not now truly foam NTC material by practical application.
Summary of the invention:
The objective of the invention is at above-mentioned situation, a kind of melt blending preparation method of HG-1P filling polyvinyl chloride PVC/ ethylene-propylene rubber(EPR) EPR foam conductive NTC material is provided, its objective is preparation technology who solves this material and the carbon black filled PVC/EPR foam conductive NTC material that obtains a kind of conductive NTC stable performance.
The present invention is achieved through the following technical solutions: be by vinylchlorid/PVC and ethylene-propylene rubber(EPR) EPR substantially, carbon black, dioctyl phthalate (DOP), stearic acid, Cellmic C 121, Zinic stearas, dicumyl peroxide, calcium/zinc is formed, it is characterized in that, selecting polyvinyl chloride/PVC and ethylene-propylene rubber(EPR) EPR is polymer matrix material, it is conductive filler material that the spy leads carbon black, dioctyl phthalate (DOP) is a softening agent, stearic acid is a lubricant, Cellmic C 121 is a whipping agent, Zinic stearas is the foaming synergist, dicumyl peroxide is a linking agent, calcium/zinc Ca/Zn one package stabilizer is a thermo-stabilizer, by opening the molten blend complete processing of refining, the moulded from foam method prepares polyvinylchloride/ethylene-propylene rubber(EPR) EPR foam conductive NTC material.The method for preparing employing melt blending, moulded from foam of the composite foamed conductive NTC material of carbon black HG-1P filling polyvinyl chloride PVC/ ethylene-propylene rubber(EPR) EPR, the concrete operations step is at first to take by weighing vinylchlorid PVC powder, plasticizer phthalic acid dioctyl ester (DOP), HG-1P, lubricant stearic acid (St), calcium/zinc Ca/Zn composite thermal stabilizer by material proportion, in beaker, stir, be positioned over after treating substantially evenly and carry out slaking in the loft drier, temperature is 70 ℃, time is 1h, and the purpose of slaking is that each component can be mixed fully.After the mixture of slaking is cooled to room temperature, in mill, open refining, add the ethylene-propylene rubber(EPR) EPR, whipping agent Cellmic C 121 (AC), foaming synergist Zinic stearas (Zn-St) and the linking agent dicumyl peroxide auxiliary agents such as (DCP) that take by weighing by material proportion simultaneously, two roll temperatures are 140 ℃ in the mixing process, mixing time 10～15min.The sample room temperature that obtains is placed in the mould that scribbles paraffin after placing 24h, with vulcanizing press baking 25～30min demoulding foaming under 170 ℃, 10Mpa pressure, it is interior in 70 ℃ of thermal equilibrium 4h to put it into vacuum drying oven then, takes out in air and promptly obtains final testing sample behind the placement 24h.Concrete material mixture ratio is as follows: material is PVC100-150 part, DOP65-90 part, EPR30-50 part, Ca/Zn one package stabilizer 4-6 part, AC4-6 part, Zn-St1-1.5 part, DCP0.5-1.0 part by mass parts than calculating proportioning, the spy leads the sooty add-on and is respectively 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, prepares five kinds of composite foamed NTC materials of carbon black filled poly-PVC/EPR.
Get the sample that radius is 30mm, an annular copper wire is respectively imbedded as electrode in sample two surfaces, places vacuum drying oven to heat up, and measures and the record data with the VC9808 digital multimeter.Will notice in the experiment that electrode should not imbed too deeply, in order to avoid influence measuring result, after 5 ℃ of every intensifications, write down a secondary data at corresponding point for measuring temperature, Range of measuring temp is 20～165 ℃, thereby obtains the NTC behavior curve of material.The foam structure of material and form are investigated with electronics scanning electron microscope (SEM).
Advantage and effect: it is polymeric matrix that the present invention adopts PVC and EPR, HG-1P is a conductive filler material, each set of dispense ratio by control material, melting temperature and mixing time, the pressure of moulded from foam, time and temperature, and the thermally equilibrated temperature and time of material, prepare HG-1P and fill poly-PVC/EPR composite foam material with NTC effect intensity height, good stability.Studies show that in recent years: HG-1P fills poly-PVC/EPR matrix material and has stable NTC characteristic.HG-1P is a powdery, and particle diameter 33nm than resistance 0.22 Ω cm, is the very strong conductive filler material of conductive capability with high structure of nano-scale.In addition, PVC and EPR are common Industrial products, and other auxiliary agents such as employed DOP, Ca/Zn one package stabilizer, blowing agent AC and crosslink agent DCP are the commercial goods in the test, and are cheap and easy to get, and the source is abundant.Therefore in the present invention, our selected starting material source is abundant, cheap and easy to get.
The present invention has searched out a kind of method that adopts melt blending, moulded from foam prepared HG-1P to fill the poly-composite foamed NTC material of PVC/EPR.With PVC and EPR is polymeric matrix, with HG-1P is conductive filler material, polyvinyl chloride (PVC) and ethylene-propylene rubber(EPR) (EPR) are polymeric matrix, dioctyl phthalate (DOP) (DOP) is a softening agent, stearic acid (St) is a lubricant, Cellmic C 121 (AC) is a whipping agent, Zinic stearas (Zn-St) is the foaming synergist, dicumyl peroxide (DCP) is a linking agent, the Ca/Zn one package stabilizer is a thermo-stabilizer, each set of dispense ratio by control material, melting temperature and mixing time, the pressure of moulded from foam, time and temperature, and the thermally equilibrated temperature and time of material prepare and have NTC effect intensity height, HG-1P filled PVC/EPR the composite foam material of good stability.In process of the present invention, the effect of PVC has two aspects: can be polymeric matrix on the one hand; The electronics of electron-withdrawing group with the constraint carbon blacksurface is provided on the other hand, makes it when being heated, discharge the formation that electronics participates in conductive channel.The effect of EPR is a toughness of improving PVC, regulates the foaming condition of foam material, guarantees can successfully foam under high content of carbon black.The effect of DOP is to improve PVC plasticity, helps the homodisperse of carbon black in body material simultaneously.
Description of drawings:
Accompanying drawing 1,2 is the stereoscan photograph of the composite foamed NTC material of the carbon black filled poly-PVC/EPR of the present invention;
Accompanying drawing 3 is the resistance-temperature curve of the composite foamed NTC material of carbon black filled poly-PVC/EPR of the different content of carbon black of the present invention.
Embodiment:
The present invention will be further described below in conjunction with embodiment:
By Fig. 1 and Fig. 2 as can be known, show be material to calculate proportioning by mass be PVC100 part, DO P65 part, EPR30 part, 4 parts of Ca/Zn one package stabilizers, AC4 part, DCP0.5 part, the SEM picture of the prepared composite foamed NTC material of carbon black filled poly-PVC/EPR when the spy leads the sooty add-on and is respectively 10 parts.Be about 0.269g/cm through surveying foam density
3, being high frothing foam body, the SEM photo of foams section is seen Fig.1, by photo as can be seen, cross section, foam hole is the Polygons on 5 or 6 limits, and the abscess space is irregular polyhedron, based on unicellular structure, the mean pore size of abscess is about 250 μ m, and abscess is tiny, even, fine and close; Bubble wall weave in well forms honey comb structure.
As shown in Figure 3, what show is that to calculate proportioning by mass be PVC100 part, DOP65 part, EPR30 part, 4 parts of Ca/Zn one package stabilizers, AC4 part, DCP0.5 part to material, the spy leads the sooty add-on and is respectively 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, has prepared the composite foamed NTC material of carbon black filled poly-PVC/EPR.Five groups of material proportions have all obtained composite foamed NTC material, and their NTC intensity (is measured the ratio of maximum resistance with the minimum resistance of material in the temperature range, i.e. ρ
Max/ ρ
Min) be respectively: when the spy led the sooty add-on and is respectively 8 parts, the NTC intensity of material was 3.67; In the time of 10 parts, the NTC intensity of material is 3.99; In the time of 12 parts, the NTC intensity of material is 2.98; In the time of 14 parts, the NTC intensity of material is 2.77; During 16 parts of parts, the NTC intensity of material is 2.53.
Among the present invention, melt-mixing method is adopted in the preparation of the composite foamed NTC material of carbon black filled poly-PVC/EPR, the concrete operations step is at first to take by weighing PVC powder, plasticizer phthalic acid dioctyl ester (DOP), HG-1P, lubricant stearic acid (St), calcium/zinc Ca/Zn composite thermal stabilizer by material proportion, in beaker, stir, be positioned over after treating substantially evenly and carry out slaking in the loft drier, temperature is 70 ℃, and the time is 1h, and the purpose of slaking is that each component can be mixed fully.After the mixture of slaking is cooled to room temperature, in mill, open refining, add the ethylene-propylene rubber(EPR) EPR, whipping agent Cellmic C 121 (AC), foaming synergist Zinic stearas (Zn-St) and the linking agent dicumyl peroxide auxiliary agents such as (DCP) that take by weighing by material proportion simultaneously, two roll temperatures are 140 ℃ in the mixing process, mixing time 10～15min.The sample room temperature that obtains is placed in the mould that scribbles paraffin after placing 24h, with vulcanizing press baking 25～30min demoulding foaming under 170 ℃, 10Mpa pressure, it is interior in 70 ℃ of thermal equilibrium 4h to put it into vacuum drying oven then, takes out in air and promptly obtains final testing sample behind the placement 24h.Get the sample that radius is 30mm, an annular copper wire is respectively imbedded as electrode in sample two surfaces, places vacuum drying oven to heat up, and measures and the record data with the VC9808 digital multimeter.Will notice in the experiment that electrode should not imbed too deeply, in order to avoid influence measuring result, after 5 ℃ of every intensifications, write down a secondary data at corresponding point for measuring temperature, Range of measuring temp is 20～165 ℃, thereby obtains the NTC behavior curve of material.The foam structure of material and form are investigated with electronics scanning electron microscope (SEM).
Technical process:
PVC+DOP+CB+ stablizer → slaking+AC+DCP+EPR → two rollers are opened refining → moulded from foam → thermal treatment → test
Concrete material mixture ratio is as follows: material is PVC100 part, DOP65-part, EPR30 part, 4 parts of Ca/Zn one package stabilizers, AC4 part, Zn-St1 part, DCP0.5 part by mass parts than calculating proportioning, the spy leads the sooty add-on and is respectively 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, prepares five kinds of composite foamed NTC materials of carbon black filled poly-PVC/EPR.Five groups of material proportions have all obtained composite foamed NTC material, and the maximum resistance of material and minimum resistance is poor in their the NTC ionization meter temperature range, i.e. ρ
Max/ ρ
MinBe respectively: when the spy led the sooty add-on and is respectively 8 parts, the NTC intensity of material was 3.67; In the time of 10 parts, the NTC intensity of material is 3.99; In the time of 12 parts, the NTC intensity of material is 2.98; In the time of 14 parts, the NTC intensity of material is 2.77; During 16 parts of parts, the NTC intensity of material is 2.53.Prepared foam densities is about 0.261～0.2 70g/cm
3, be high frothing foam body, by the SEM photo as can be seen, cross section, foam hole is the Polygons on 5 or 6 limits, and the abscess space is irregular polyhedron, and based on unicellular structure, the mean pore size of abscess is about 250 μ m, and abscess is tiny, even, fine and close; Bubble wall weave in well forms honey comb structure.
Claims (5)
1, a kind of preparation method of carbon black filled polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material, be by vinylchlorid/PVC and ethylene-propylene rubber(EPR) EPR, carbon black, dioctyl phthalate (DOP), stearic acid, Cellmic C 121, Zinic stearas, dicumyl peroxide, calcium/zinc is formed, it is characterized in that, selecting polyvinyl chloride/PVC and ethylene-propylene rubber(EPR) EPR is polymer matrix material, it is conductive filler material that the spy leads carbon black, dioctyl phthalate (DOP) is a softening agent, stearic acid is a lubricant, Cellmic C 121 is a whipping agent, Zinic stearas is the foaming synergist, dicumyl peroxide is a linking agent, the Ca/Zn one package stabilizer is a thermo-stabilizer, by opening the molten blend complete processing of refining, the moulded from foam method prepares the PVC/EPR foam conductive NTC material.
2, the preparation method of carbon black filled polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material according to claim 1, it is characterized in that, material is PVC100-150 part, DOP65-90 part, EPR30-50 part, Ca/Zn one package stabilizer 4-6 part, AC4-6 part, DCP0.5-1.0 part by mass parts than calculating proportioning, the spy leads the sooty add-on and is respectively 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, has prepared the composite foamed conductive NTC material of carbon black filled poly-PVC/EPR.
3, the preparation method of carbon black filled polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material according to claim 1, it is characterized in that: the concrete operations step is the PVC powder that at first takes by weighing 100-150 part, the DOP of P65-90 part, the Ca/Zn one package stabilizer of 4-6 part, in beaker, stir, be positioned over after treating substantially evenly and carry out slaking (temperature is 70 ℃, and the time is 1h) in the loft drier.The mixture of slaking is cooled to room temperature, in mill, open refining after adding 4 parts of Cellmic C 121 AC, 1 part of Zinic stearas Zn-St and 1 part of other auxiliary agent such as dicumyl peroxide DCP, add 30 parts of ethylene-propylene rubber(EPR) EPR simultaneously, in the mixing process two roll temperature 140-145 ℃, mixing time 10-15min.
4, the preparation method of carbon black filled polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material according to claim 1, it is characterized in that: the sample room temperature placement 24h that claim 3 is obtained is placed in the mould that scribbles paraffin afterwards, with vulcanizing press baking 25～30min demoulding foaming under 170-180 ℃, 8-10Mpa pressure, it is interior in 70 ℃ of thermal equilibrium 4h to put it into vacuum drying oven then, takes out in air and promptly obtains final testing sample behind the placement 12-24h.
5, the preparation method of carbon black filled polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material according to claim 1, it is characterized in that: get the sample that radius is the 30mm testing sample, an annular copper wire is respectively imbedded as electrode in sample two surfaces, place vacuum drying oven to heat up, measure and the record data with digital multimeter or resistance meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100106791A CN101508793A (en) | 2009-03-13 | 2009-03-13 | Preparation method for filling polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material with hydrocarbon black |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100106791A CN101508793A (en) | 2009-03-13 | 2009-03-13 | Preparation method for filling polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material with hydrocarbon black |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101508793A true CN101508793A (en) | 2009-08-19 |
Family
ID=41001332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100106791A Pending CN101508793A (en) | 2009-03-13 | 2009-03-13 | Preparation method for filling polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material with hydrocarbon black |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101508793A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102558709A (en) * | 2011-12-21 | 2012-07-11 | 常州大学 | Flexible polyvinyl chloride foam material and molding method thereof |
| CN102634131A (en) * | 2012-04-11 | 2012-08-15 | 深圳市新纶科技股份有限公司 | Low-density PVC (Poly Vinyl Chloride) injection-molded shoe material and preparation method thereof |
| CN104151594A (en) * | 2014-06-30 | 2014-11-19 | 安徽恒森新材料有限公司 | Foaming agent synergistic auxiliary agent |
| CN104842568A (en) * | 2015-04-20 | 2015-08-19 | 中国科学院长春应用化学研究所 | Preparation method of conductive polymeric material |
-
2009
- 2009-03-13 CN CNA2009100106791A patent/CN101508793A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102558709A (en) * | 2011-12-21 | 2012-07-11 | 常州大学 | Flexible polyvinyl chloride foam material and molding method thereof |
| CN102634131A (en) * | 2012-04-11 | 2012-08-15 | 深圳市新纶科技股份有限公司 | Low-density PVC (Poly Vinyl Chloride) injection-molded shoe material and preparation method thereof |
| CN102634131B (en) * | 2012-04-11 | 2014-06-18 | 深圳市新纶科技股份有限公司 | Low-density PVC (Poly Vinyl Chloride) injection-molded shoe material and preparation method thereof |
| CN104151594A (en) * | 2014-06-30 | 2014-11-19 | 安徽恒森新材料有限公司 | Foaming agent synergistic auxiliary agent |
| CN104151594B (en) * | 2014-06-30 | 2018-01-19 | 安徽恒森新材料有限公司 | A kind of foaming agent cooperates with auxiliary agent |
| CN104842568A (en) * | 2015-04-20 | 2015-08-19 | 中国科学院长春应用化学研究所 | Preparation method of conductive polymeric material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5958303A (en) | Electrically conductive compositions and methods for producing same | |
| Sau et al. | Electrical and mechanical properties of conducting carbon black filled composites based on rubber and rubber blends | |
| Tang et al. | Synergetic effects of carbon nanotubes and carbon fibers on electrical and self-heating properties of high-density polyethylene composites | |
| Tang et al. | Studies on the electrical conductivity of carbon black filled polymers | |
| Kranauskaite et al. | Dielectric properties of graphite‐based epoxy composites | |
| CN101508793A (en) | Preparation method for filling polyvinyl chloride/ethylene propylene rubber composite foam conductive NTC material with hydrocarbon black | |
| CN103113732A (en) | Conductive polymer composite and preparation method thereof | |
| CN102352087B (en) | Antistatic flame-retardant acrylonitrile butadiene styrene (ABS) rubber material and preparation method thereof | |
| EP1166282A1 (en) | Electrically conductive compositions and methods for producing same | |
| Bertolini et al. | Fabrication and characterization of piezoresistive flexible pressure sensors based on poly (vinylidene fluoride)/thermoplastic polyurethane filled with carbon black‐polypyrrole | |
| Huang et al. | Processability, mechanical properties, and electrical conductivities of carbon black‐filled ethylene‐vinyl acetate copolymers | |
| Tian et al. | Rapid electrothermal response and excellent flame retardancy of ethylene‐vinyl acetate electrothermal film | |
| AU740765B2 (en) | Conductive polymer composite materials and methods of making same | |
| Lee et al. | Morphology, resistivity, and thermal behavior of EVOH/carbon black and EVOH/graphite composites prepared by simple saponification method | |
| JP2002298865A (en) | Fuel cell separator and manufacturing method therefor | |
| Ghofraniha et al. | Electrical conductivity of polymers containing carbon black | |
| CN103214799A (en) | Heat conduction antistatic PET/PTT material and preparation method thereof | |
| Bertolini et al. | Poly (vinylidene fluoride) and thermoplastic polyurethane composites filled with carbon black‐polypyrrole for electromagnetic shielding applications | |
| El‐Tantawy et al. | New smart conducting elastomer blends of Bi‐based superconductor ceramics nanoparticles reinforced natural rubber/low‐density polyethylene for double thermistors, antistatic protectors, and electromagnetic interference shielding effectiveness applications | |
| CN109320849A (en) | Anti-electrostatic fire retardant polypropylene material and preparation method thereof | |
| Mohd Yazid et al. | Effects of polyaniline loading and naphthalene surface modifier on properties of conductive polyethylene oxide/polyvinyl chloride/polyaniline films | |
| Kim et al. | PTC behavior of polymer composites containing ionomers upon electron beam irradiation | |
| CN107663376A (en) | A kind of encapsulant and preparation method thereof | |
| Xia et al. | A model-based approach to electrical percolation behavior of CB-HDPE composites | |
| Li et al. | Positive temperature coefficient behavior of HDPE/EVA blends filled with carbon black |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090819 |