CN103247363B - A kind of superlow resistance conductive film and preparation method thereof - Google Patents
A kind of superlow resistance conductive film and preparation method thereof Download PDFInfo
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- CN103247363B CN103247363B CN201210434667.3A CN201210434667A CN103247363B CN 103247363 B CN103247363 B CN 103247363B CN 201210434667 A CN201210434667 A CN 201210434667A CN 103247363 B CN103247363 B CN 103247363B
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Abstract
The invention belongs to polymeric material field, relate to a kind of conducting film and preparation method thereof.The component of conducting film is polyurethanes (PU), benzene class organic solvent, carbon black and dispersant.Preparation technology comprises mixing, grinding, blade coating step.Conducting film of the present invention has lower sheet resistance, is tens ohm, and resistance value is even, and resistance local error is less than 2%, and sheet resistance can not change because of friction temperature humidity.
Description
Technical field
The invention belongs to conducting polymer composite field, be specifically related to a kind of superlow resistance conductive film material.
Background technology
Along with the development of material science, the application of conducting film in electronic circuit and Display Technique field is more and more extensive.Current known conducting film, the method for general vacuum suction, electric conducting material, the metals such as such as silver, aluminium are attached on the carriers such as plastics, and make its surface form conducting film, its conductive resistance changes along with the change adding electric conducting material amount.The conducting film that this method is made, sheet resistance easily along with friction bending or hot and humid and change, produces very large error.
A kind of conducting film is also had in prior art; that method carbon black and plastics (mainly PE, PVC etc.) particle being mixed recycling blown film or curtain coating is formed; the product electric conductivity of this method is not good; minimum resistance is about several kilohms; and sheet resistance is uneven; the error of general 20% may be produced, make this conducting film electronics and medical in cannot use.
Summary of the invention
The object of the invention is the weak point overcoming 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 feature of sheet resistance, and tension, fire-retardant, not easily break, be applicable to being applied to electronics and medical field, such as, can be applicable to 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 parts by weight, 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 acetylene black.Described dispersant is common dispersants in this area.
A preparation method for described high molecular polymer conducting film, comprises mixing, grinding, blade coating step.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.Dispersant is added in solvent after grinding and black stock.Polyurethane resin is added, i.e. PU resin after abundant grinding.According to parts by weight, 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 film precast body.Film precast body is placed a period of time and carry out deaeration, the gas bubbles inside film precast body is fully broken.Adopt scraper by film precast body blade coating on leaching membrane paper, employing drying plant forms conducting film after drying.
In order to ensure electric conductivity and the smoothness of the surface of conducting film, carbon black adopts Powdered, and preferable particle size is 50 microns.
When the thickness of conducting film is 45-55 micron, comprehensive conductive effect is best.
The time of described deaeration is 24-48 hour.Described drying plant is baking oven.Bake out temperature is Fen Sange district, first district 40-50 degree Celsius general 10 meters, second district 50-60 degree Celsius general 15 meters, the 3rd district 130-150 degree Celsius general 20 meters.
In the present invention dispersant add the compatibility adding carbon black, resin and solvent, accelerated solvent penetrates in conducting particles gap, replaces the air of interparticle adsorption, thus helps the 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 not easily broken, the not performance of malleable product own.
Add polyurethane resin again after carbon black and the abundant ground and mixed of organic solvent in preparation method of the present invention again to grind, raw material is mixed more even, thus the resistance homogeneity of conducting film is improved.Instant invention overcomes adsorption electric conducting material easily to come off and the larger and uneven two kinds of drawbacks of resistance ratio, the most I of resistance accomplishes 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 affect the characteristic of film itself, such as stretching resistance, fire-retardant, not easily break.
Accompanying drawing illustrates:
Accompanying drawing 1 shows the impact of content on electric conductivity of conductive black.
Accompanying drawing 2 shows the impact of powder diameter on electric conductivity of conductive black.
Accompanying drawing 3 shows the impact of thickness on electric conductivity of conducting film.
Embodiment
Embodiment 1:
In closed container by micron powder shape superconduction carbon black and benzene class organic solvent according to 1: 1 ratio mixing, superconduction carbon black is dissolved completely in solvent, becomes thick.Grind through grinder, superconduction carbon black and organic solvent are fully mixed.Dispersant is added in solvent after grinding and superconduction black stock.Polyurethane resin is added, i.e. PU resin after after abundant grinding.According to parts by weight, each component addition is: polyurethanes (PU): 100; Benzene class organic solvent: 15-30; Dispersant: 1-3; Superconduction carbon black: adopt different additions in the scope of 0-25.Stir through mixer after adding resin, obtain film precast body.Film precast body is placed and within 48 hours, carries out deaeration, the gas bubbles inside film precast body is fully broken.Adopt scraper by film precast body blade coating on leaching membrane paper, formation black conductive film after adopting drying plant to dry.
Adopt universal instrument measured resistance value, resistance measurement probe is 10mm.
Can find out from the graph, the surface conductivity impact of conductive black proportion on conducting film itself is very large.Conductive black accounts for resin content when 0%-5%, surface area Resistance Maximum.Content resistance when 5%-10% declines slowly, decline obviously when 10%-20%, declining slowly lower than 20%, so conductive black accounts for resin content higher than continuing to strengthen content of carbon black after 25% to electric conductivity less than too large change, the performance of film can be affected on the contrary.Be unfavorable for the quality assurance of film itself.Therefore the percentage that carbon black accounts for resin content is defined as 15-25%.
Embodiment 2:
Adopt the conductive black of different-grain diameter to prepare conducting film, preparation method is with embodiment 1.The percentage that conductive black accounts for resin content is 20%.Sheet resistance is detected, as shown in Figure 2 after obtaining conducting film.
With reference to Fig. 2 as seen along with the reduction of conductive black particle diameter, conducting film sheet resistance can increase.Do not having in the raw material ground, conducting particles aggregation is not destroyed, and grinding can destroy the conductive network formed in original system, reduces the contact probability of conducting particles, thus electric conductivity is reduced.Conductive black particle diameter is less, is more easily encased by organic solvent, and organic solvent is insulation, so conductive black particle diameter less conducting film sheet resistance is higher.But particle diameter conference effects on surface outward appearance affects to some extent, causes film rough surface.Contrary particle diameter little conducting film surface effect is best, but resistance is high.Conductive black particle diameter is prepared burden 50 microns time, and to grind the conducting film effect obtained again best.
Embodiment 3:
Prepare the conducting film of different-thickness, preparation method is with embodiment 1.The percentage that conductive black accounts for resin content is 20%.Sheet resistance is detected, as shown in Figure 3 after obtaining conducting film.
Film thickness increases conducting film sheet resistance and can reduce, and when film thickness is to time certain, sheet resistance increases with film thickness and change is little.When the thickness of conducting film is 45-55 micron, conductive effect is ideal.
Claims (6)
1. prepare the method for high molecular polymer conducting film for one kind, it is characterized in that comprising mixing, grinding, blade coating step, 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, dispersant is added in solvent after grinding and black stock, polyurethane resin (PU) is added after abundant grinding, according to parts by weight, 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 film precast body, film precast body is placed a period of time and carry out deaeration, gas bubbles inside film precast body is fully broken, adopt scraper by film precast body blade coating on leaching membrane paper, employing drying plant forms conducting film after drying.
2. method according to claim 1, is characterized in that, the time of described deaeration is 24-48 hour.
3. method according to claim 1, is characterized in that, described drying plant is baking oven, and bake out temperature is Fen Sange district, first district 40-50 degree Celsius 10 meters, second district 50-60 degree Celsius 15 meters, the 3rd district 130-150 degree Celsius 20 meters.
4. the high molecular polymer conducting film prepared of method according to claim 1, according to parts by weight, composed of the following components:
Polyurethanes (PU): 100;
Benzene class organic solvent: 15-30;
Carbon black: 15-25;
Dispersant: 1-3.
5. high molecular polymer conducting film according to claim 4, is characterized in that,
Described carbon black is Powdered, and its particle diameter is 50 microns;
The thickness of described conducting film is 45-55 micron.
6. the high molecular polymer conducting film according to claim 4 or 5, is characterized in that, described carbon black is one or more in conductive black, superconduction carbon black and acetylene black.
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| CN103247363B true CN103247363B (en) | 2015-08-12 |
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Citations (5)
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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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6926972B2 (en) * | 2002-01-10 | 2005-08-09 | Basf Corporation | Method of providing an electroluminescent coating system for a vehicle and an electroluminescent coating system thereof |
| US7294033B1 (en) * | 2006-05-03 | 2007-11-13 | Speed Tech Corp. | Method for fabricating luminescent solid key |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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