CN103247363A - Superlow resistance conductive film and preparation method thereof - Google Patents
Superlow resistance conductive film and preparation method thereof Download PDFInfo
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- CN103247363A CN103247363A CN2012104346673A CN201210434667A CN103247363A CN 103247363 A CN103247363 A CN 103247363A CN 2012104346673 A CN2012104346673 A CN 2012104346673A CN 201210434667 A CN201210434667 A CN 201210434667A CN 103247363 A CN103247363 A CN 103247363A
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Abstract
The invention belongs to the field of polymer materials, and relates to a conductive film and a preparation method thereof. The conductive film comprises the constituents including polyurethane PU, benzene organic solvent, carbon black and a dispersing agent. The preparation method comprises the steps of mixing, grinding, scraping and coating. The conductive film provided by the invention has lower surface resistance about dozens of ohm, the resistance value is uniform, the local error of the resistance is less than 2 percent, and the surface resistance maintains the same without affecting by friction, temperature and humidity.
Description
Technical field
The invention belongs to the conducting polymer composite field, be specifically related to a kind of super-low resistance conducting membrane material.
Background technology
Along with the development of material science, conducting film in electronic circuit and Display Technique Application for Field more and more widely.Present known conducting film, the general using vacuum adsorption method, electric conducting material, for example metals such as silver, aluminium are attached on the carrier such as plastics, make its surface form conducting film, and its conductive resistance changes along with the variation of adding the electric conducting material amount.The conducting film that this method is made, sheet resistance along with friction bending or hot and humid and change, produce very big error easily.
Also has a kind of conducting film in the prior art; be the method formation with carbon black and the mixed recycling blown film of plastics (mainly being PE, PVC etc.) particle or curtain coating; the product electric conductivity of this method is not good; minimum resistance is about several kilohms; and sheet resistance is inhomogeneous; may produce general 20% error, make this conducting film electronics and medical aspect can't use.
Summary of the invention
The objective of the invention is to overcome the weak point of prior art, propose a kind of conducting film and preparation method thereof.It is low that membrane material of the present invention has resistance, and the uniform characteristics of sheet resistance, and tension, fire-retardant, be difficult for breaking, be fit to be applied to electronics and medical field, for example can be applicable to the large flat display screen.Membrane material preparation technology of the present invention is simple, is particularly suitable for industrial production.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of high molecular polymer conducting film, according to the weight portion meter, composed of the following components:
Polyurethanes (PU): 100;
Benzene class organic solvent: 15-30;
Carbon black: 15-25;
Dispersant: 1-3.
Described carbon black is one or more in conductive black, superconduction carbon black and the acetylene black.Described dispersant is common dispersants in this area.
A kind of preparation method of described high molecular polymer conducting film comprises mixing, grinding, blade coating step.At first in closed container, carbon black and benzene class organic solvent are mixed according to a certain percentage, and grind through grinder, carbon black and organic solvent are fully mixed.Add dispersant in solvent after grinding and the black stock.Fully grind the back and add polyurethane resin, i.e. PU resin.According to the weight portion meter, each component addition is: polyurethanes (PU): 100; Benzene class organic solvent: 15-30; Carbon black: 15-25; Dispersant: 1-3.Stir through mixer after adding resin, obtain the film precast body.The film precast body is placed a period of time carry out deaeration, make the gas bubbles of film precast body the inside fully break.The employing scraper on leaching membrane paper, adopts drying plant oven dry back to form conducting film film precast body blade coating.
For electric conductivity and the smoothness of the surface that guarantees conducting film, carbon black adopts Powdered, and preferable particle size is 50 microns.
When the thickness of conducting film was the 45-55 micron, comprehensive conductive effect was best.
The time of described deaeration is 24-48 hour.Described drying plant is baking oven.Bake out temperature is for dividing three districts, and 40-50 degree centigrade general 10 meters in first district distinguishes 50-60 degree centigrade general 15 meters for second, distinguishes 130-150 degree centigrade general 20 meters for the 3rd.
The adding of dispersant has increased the compatibility of carbon black, resin and solvent among the present invention, and accelerated solvent penetrates in the conducting particles slit, replaces the air of interparticle surface absorption, thereby helps opening of filler granule.
Conducting film of the present invention is black, and its service time is permanent, and resistance is even, and long-time friction is rubbed and is difficult for breaking, not the performance of malleable product own.
Add polyurethane resin again after the abundant ground and mixed of carbon black and organic solvent among the preparation method of the present invention and grind again, it is more even to make that raw material mixes, thereby makes the resistance uniformity of conducting film improve.The present invention has overcome surperficial absorption electric conducting material and has come off easily and two kinds of bigger and inhomogeneous drawbacks of resistance ratio, and the I of resistance is accomplished tens ohm, and local error is less than 2%, and sheet resistance can not change because of friction temperature humidity.
The present invention greatly reduces the sheet resistance of conducting film, does not influence the characteristic of film itself, such as stretching resistance, fire-retardant, be difficult for breaking etc.
Description of drawings:
Accompanying drawing 1 shows that the content of conductive black is to the influence of electric conductivity.
Accompanying drawing 2 shows that the powder diameter of conductive black is to the influence of electric conductivity.
Accompanying drawing 3 shows that the thickness of conducting film is to the influence of electric conductivity.
Embodiment
Embodiment 1:
In closed container micron powder shape superconduction carbon black and benzene class organic solvent are mixed according to 1: 1 ratio, the superconduction carbon black is dissolved in the solvent fully, becomes thick.Grind through grinder, superconduction carbon black and organic solvent are fully mixed.Add dispersant in solvent after grinding and the superconduction black stock.Fully grind the back, back and add polyurethane resin, i.e. PU resin.According to the weight portion meter, each component addition is: polyurethanes (PU): 100; Benzene class organic solvent: 15-30; Dispersant: 1-3; Superconduction carbon black: in the scope of 0-25, adopt different additions.Stir through mixer after adding resin, obtain the film precast body.The placement of film precast body is carried out deaeration in 48 hours, make the gas bubbles of film precast body the inside fully break.The employing scraper on leaching membrane paper, adopts drying plant oven dry back to form the black conductive film film precast body blade coating.
Adopt the universal instrument measured resistance value, the resistance measurement probe is 10mm.
From the graph as can be seen, the conductive black proportion is very big to the surface conductivity influence of conducting film itself.Conductive black accounts for resin content when 0%-5%, and surface area resistance is very big.Content resistance in the time of 5%-10% descends slowly, in the time of 10%-20%, descend obviously, be lower than 20% and descend slowly, thus conductive black account for resin content be higher than 25% back continue to strengthen content of carbon black to electric conductivity less than too big change, can influence the performance of film on the contrary.The quality assurance that is unfavorable for film itself.Therefore the carbon black percentage that accounts for resin content is defined as 15-25%.
Embodiment 2:
Adopt the conductive black of different-grain diameter to prepare conducting film, the preparation method is with embodiment 1.The percentage that conductive black accounts for resin content is 20%.Obtain detecting sheet resistance behind the conducting film, as shown in Figure 2.
As seen along with the reducing of conductive black particle diameter, the conducting film sheet resistance can increase with reference to Fig. 2.In not having the raw material that grinds, the conducting particles aggregation does not have destroyed, and grinding can destroy the conductive network that forms in the original system, reduces the contact probability of conducting particles, thereby makes electric conductivity reduce.The conductive black particle diameter is more little, encased by organic solvent more easily, and organic solvent insulate, so the more little conducting film sheet resistance of conductive black particle diameter is more high.But the particle diameter conference influences to some extent to appearance, causes the film rough surface.The opposite little conducting film surface effect of particle diameter is best, but the resistance height.The conductive black particle diameter conducting film effect that grinding again obtains of preparing burden in the time of 50 microns is best.
Embodiment 3:
The conducting film of preparation different-thickness, the preparation method is with embodiment 1.The percentage that conductive black accounts for resin content is 20%.Obtain detecting sheet resistance behind the conducting film, as shown in Figure 3.
Film thickness increases the conducting film sheet resistance and can reduce, when film thickness to certain the time, sheet resistance increases with film thickness and changes not quite.When the thickness of conducting film was the 45-55 micron, conductive effect was ideal.
Claims (7)
1. high molecular polymer conducting film, according to the weight portion meter, composed of the following components:
Polyurethanes (PU): 100;
Benzene class organic solvent: 15-30;
Carbon black: 15-25;
Dispersant: 1-3.
2. high molecular polymer conducting film according to claim 1 is characterized in that, described carbon black is one or more in conductive black, superconduction carbon black and the acetylene black.
3. high molecular polymer conducting film according to claim 1 is characterized in that, described carbon black is Powdered, and its particle diameter is 50 microns.
4. high molecular polymer conducting film according to claim 1 is characterized in that, the thickness of described conducting film is the 45-55 micron.
5. one kind prepares the method for high molecular polymer conducting film according to claim 1, it is characterized in that comprising mixing, grinding, blade coating step, at first in closed container, carbon black and benzene class organic solvent are mixed according to a certain percentage, and the process grinder grinds, carbon black and organic solvent are fully mixed, add dispersant in solvent after grinding and the black stock, fully grind the back and add polyurethane resin (PU), according to the weight portion meter, each component addition is: polyurethanes (PU): 100; Benzene class organic solvent: 15-30; Carbon black: 15-25; Dispersant: 1-3, stir through mixer after adding resin, obtain the film precast body, the film precast body is placed a period of time carry out deaeration, make the gas bubbles of film precast body the inside fully break, the employing scraper on leaching membrane paper, adopts drying plant oven dry back to form conducting film film precast body blade coating.
6. method according to claim 5 is characterized in that, the time of described deaeration is 24-48 hour.
7. method according to claim 5 is characterized in that, described drying plant is baking oven, bake out temperature is for dividing three districts, 40-50 degree centigrade general 10 meters in first district distinguishes 50-60 degree centigrade general 15 meters for second, distinguishes 130-150 degree centigrade general 20 meters for the 3rd.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106147198A (en) * | 2015-03-09 | 2016-11-23 | 台虹科技股份有限公司 | Conductive composition, conductive film and method for manufacturing conductive film |
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| CN101065323A (en) * | 2004-10-01 | 2007-10-31 | 帝国化学工业公司 | Dispersions, films, coatings and composites |
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| CN101331251A (en) * | 2005-10-21 | 2008-12-24 | 可乐丽股份有限公司 | Electrically conductive composite fiber and process for producing the same |
| CN101387614A (en) * | 2008-10-16 | 2009-03-18 | 上海交通大学 | Air-sensitive micro sensor based on conducting polymer-carbon black granules |
| CN101624468A (en) * | 2009-07-30 | 2010-01-13 | 海宁杰玛高科涂层织物有限公司 | Conductive film of coating of high molecular polymer and preparation method thereof |
| CN102532975A (en) * | 2011-12-27 | 2012-07-04 | 深圳市乐普泰科技股份有限公司 | Nano aqueous conductive carbon black color paste and preparation method thereof |
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- 2012-11-05 CN CN201210434667.3A patent/CN103247363B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030129297A1 (en) * | 2002-01-10 | 2003-07-10 | Michael Jakobi | Method of providing an electroluminescent coating system for a vehicle and an electroluminescent coating system thereof |
| CN101065323A (en) * | 2004-10-01 | 2007-10-31 | 帝国化学工业公司 | Dispersions, films, coatings and composites |
| CN101331251A (en) * | 2005-10-21 | 2008-12-24 | 可乐丽股份有限公司 | Electrically conductive composite fiber and process for producing the same |
| US20070256290A1 (en) * | 2006-05-03 | 2007-11-08 | Speed Tech Corp. | Method for fabricating luminescent solid key |
| CN101387614A (en) * | 2008-10-16 | 2009-03-18 | 上海交通大学 | Air-sensitive micro sensor based on conducting polymer-carbon black granules |
| CN101624468A (en) * | 2009-07-30 | 2010-01-13 | 海宁杰玛高科涂层织物有限公司 | Conductive film of coating of high molecular polymer and preparation method thereof |
| CN102532975A (en) * | 2011-12-27 | 2012-07-04 | 深圳市乐普泰科技股份有限公司 | Nano aqueous conductive carbon black color paste and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106147198A (en) * | 2015-03-09 | 2016-11-23 | 台虹科技股份有限公司 | Conductive composition, conductive film and method for manufacturing conductive film |
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