CN109148047B - Resistance value debugging method for surface carbon coating of polystyrene foam pellets - Google Patents
Resistance value debugging method for surface carbon coating of polystyrene foam pellets Download PDFInfo
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- CN109148047B CN109148047B CN201811051099.2A CN201811051099A CN109148047B CN 109148047 B CN109148047 B CN 109148047B CN 201811051099 A CN201811051099 A CN 201811051099A CN 109148047 B CN109148047 B CN 109148047B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
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Abstract
The invention relates to a resistance value debugging method for coating carbon on the surface of polystyrene foam balls, in particular to a method capable of effectively reducing the resistance value. Mixing acetylene black and other structural carbon, adding glue, mixing to prepare a coating solution, and coating the coating solution on the surface of the polystyrene foam bead; the coating liquid comprises the following raw materials in percentage by weight of solid content: 25-40% of acetylene black, 45-55% of other structural carbon, 45-55% of adhesive and the balance of other non-conductive auxiliary agents; wherein the other structural carbons are: 3 to 7 percent of superconducting carbon black, 6 to 18 percent of expanded graphite, 6 to 18 percent of nano graphite or 3 to 7 percent of carbon nano tube. The method can obviously reduce the resistance, the surface resistance value can reach about 300-480 ohms after 4 times of coating, and each particle of the carbon-coated pellets can be conducted and has lower resistance. Compared with the coating condition of only using acetylene black as a conductive material, the surface resistance value is reduced by about 10 times, and the method is an effective method for adjusting the resistance value.
Description
Technical Field
The invention relates to a resistance value debugging method for coating carbon on the surface of a polystyrene foam ball.
Background
The resistance is a specific physical parameter of the conductor, the size of the resistance is related to the material of the conductor, whether the resistance is useful and what function the resistance plays, and what is used is the key point to see; a substance which has a small resistance and easily conducts current is called a conductor, a substance which has a large resistance and is inferior to conduction of current is called an insulator, and a substance between them is called a semiconductor.
In order to increase the conductivity of a substance, it is conceivable to use a conductive material such as a metal, an inorganic (ionic, carbon, or metal oxide), a composite (inorganic-organic) polymer conductive material, or a structural polymer conductive material. However, the applicable aspect of each material is different, so that from the practical point of view, the inventor needs to specifically analyze specific problems and search for a conductive material suitable for the requirement of a certain aspect. The invention aims to reduce the resistance of the surface carbon coating of polystyrene foam beads, and in the early test work, only single acetylene black is used as a conductive material, and tests show that the surface resistance is reduced with the increase of the use amount of the acetylene black, but the surface resistance can only reach about 3600-4100 ohm at the lowest, and the resistance cannot reach the expected effect, so the resistance cannot meet the application requirement, and a method for reducing the resistance is to be developed.
Disclosure of Invention
The invention aims to provide a resistance debugging method for coating carbon on the surface of a polystyrene foam ball, and a method for reducing the resistance.
The technical scheme adopted by the invention to achieve the aim is as follows:
a resistance value debugging method for coating carbon on the surface of polystyrene foam beads is characterized in that acetylene black and other structural carbon are mixed to prepare coating liquid which is coated on the surface of the polystyrene foam beads; the coating liquid comprises the following raw materials in percentage by weight of solid content: 25-40% of acetylene black, 45-55% of other structural carbon, 45-55% of adhesive and the balance of other non-conductive auxiliary agents; wherein the other structural carbons are: 3 to 7 percent of superconducting carbon black, 6 to 18 percent of expanded graphite, 6 to 18 percent of nano graphite or 3 to 7 percent of carbon nano tube.
In the method, the preference of the superconducting carbon black is 6%, the preference of the expanded graphite is 9-12%, the preference of the nano graphite is 9%, and the preference of the carbon nano tube is 6%.
In the method of the invention, the adhesive is preferably styrene-acrylic emulsion, and in order to ensure that the coating does not fall off after 4 times of coating and the water resistance, the minimum amount is 45 percent after the test, so the adhesive is preferably 45 percent. Other adhesives may be used instead. The conductive material of the invention adopts the mixture of acetylene black and carbon with other structures, and the carbon with other structures adopts the following components: high-structure type superconducting carbon black Keqin EC-600JD, expanded graphite (10 microns), nano graphite (0.5 micron) and carbon nano tubes (30-50 microns); the acetylene black with certain solid content and mass percentage is mixed with other structural carbon with different solid content and mass percentage, the styrene-acrylic emulsion is used as an adhesive, and the prepared coating liquid is coated on the surface of the polystyrene foam bead, and the test is as follows: if the weight ratio of 10:9 is adopted, stirring and drying are not easy, and the weight ratio of 10: the amount of coating carbon is naturally relatively small, the weight ratio of the polystyrene foam beads to the coating solution is determined to be 10:8 for the optimum maximum mixing ratio, the number of coating passes is fixed to 4, the surface resistance value of the polystyrene foam beads coated 4 times is measured by a QUICK499D surface resistance tester, and the surface resistance value is significantly reduced and can meet the required requirements by comparing the measured value with the coating condition of using acetylene black alone. The coating liquid is prepared by mixing acetylene black with other structural carbons, adding water and a dispersing agent, grinding at a high speed, taking styrene-acrylic emulsion as an adhesive, adding other non-conductive additives, and stirring, dispersing and mixing according to a certain weight proportion.
In the present invention, the coated carrier used is polystyrene foam beads having a density of 20kg/m3The diameter of the small ball is 1-4 mm.
The coating method adopted in the invention is as follows, and the weight mixing ratio of each coating is 10:8 (polystyrene foam beads: coating liquid), coating for 4 times, ensuring that the particles in each time are basically in a dispersed state according to the used equipment and the ambient temperature and humidity conditions, then coating for the next time, and measuring the surface resistance value after coating for 4 times and completely drying overnight.
In the present invention, after the above coating manner was completed, the surface resistance value of the particles of the polystyrene foam beads coated 4 times was measured using a QUICK499D surface resistance tester. Measuring the surface resistance value to be 350-450 ohm by adopting a mixing mode of 25% of acetylene black and 6% of superconducting carbon black in solid content weight; the surface resistance value is measured to be 410-480 ohms by a mixing mode of 25% of acetylene black and 9% or 12% of expanded graphite in solid content weight; the surface resistance value is 560-750 ohm when the acetylene black with solid content weight is 25% + the nano graphite with solid content weight is 9%; the surface resistance value is about 300 ohm when the mixing mode of acetylene black 25% and carbon nano tube 6% is measured.
According to the invention, acetylene black is respectively mixed with other structural carbons, and the mixture is coated on the surfaces of polystyrene foam beads after being added with glue and mixed, so that the resistance value can be obviously reduced, the surface resistance value can reach about 300-480 ohms after being coated for 4 times, and each bead particle coated with carbon on the surface can be conducted and has lower resistance. Compared with the coating condition only using acetylene black as a conductive material, the surface resistance value of the polystyrene foam bead coated for 4 times after the coating method is adopted is reduced by about 10 times, and the method is an effective resistance value debugging method.
Detailed Description
Example 1
Preparing 1000 parts of coating liquid with acetylene black accounting for 25 percent of the weight of solid content, weighing 79.6 parts of acetylene black by weight, 287.1 parts of styrene-acrylic emulsion accounting for 45 percent of the weight of the solid content, 537.6 parts of water, and 95.7 parts of dispersing agent and other conventional non-conductive additives, firstly grinding and dispersing the water, the dispersing agent and the acetylene black at high speed by using a grinding machine, then adding the other non-conductive additives for dispersing by using a dispersing machine, and finally adding the styrene-acrylic emulsion SD-800 for uniformly stirring and dispersing by using the dispersing machine to form the coating liquid; weighing 100g of polystyrene foam beads by weight, pouring 80 g of coating liquid into a stirring container, stirring into a dispersed state by a single planet type stirrer, wherein the process comprises the steps of coating for 1 time, then 80 g of coating liquid is poured into the stirring container again until the surfaces of the small balls coated for 1 time are coated for the 2 nd time coating, after the 2 nd time coating is finished, coating the 3 rd and 4 th times according to the method, measuring the surface resistance value after the particles coated for 4 times are completely dried overnight, measuring the surface resistance value of the particles of the polystyrene foam beads coated for 4 times by a QUICK499D surface resistance tester to be about 5600-6000 ohm, coating conditions and analysis that acetylene black accounts for 25%, 30%, 35%, 40% and more than 40% of the solid content are shown in Table 1, in order to add reserved space for other structural carbon, therefore, 25 percent of acetylene black in the solid content weight is taken as a base when other structural carbon is added for compounding. When the styrene-acrylic emulsion accounts for 55 percent of the solid content, 339.4 parts, 77.2 parts of acetylene black, 521.9 parts of water, 61.5 parts of dispersant and other conventional non-conductive additives are weighed according to the weight.
TABLE 1
Example 2
Preparing 1000 parts of coating liquid with acetylene black accounting for 25 percent of the weight of the solid content and superconducting carbon black accounting for 6 percent of the weight of the solid content, weighing 79.6 parts of acetylene black, 19 parts of superconducting carbon black, 287.1 parts of styrene-acrylic emulsion accounting for 45 percent of the weight of the solid content, 537.6 parts of water and 76.7 parts of dispersing agent and other non-conductive additives according to the weight, firstly, adding water and the dispersing agent into the acetylene black and the superconducting carbon black by a grinder, grinding and mixing at a high speed, then adding other conventional non-conductive additives for dispersing, and finally adding styrene-acrylic emulsion for uniformly stirring and dispersing by a dispersion machine to form the coating liquid; weighing 100g of polystyrene foam beads by weight, taking 80 g of coating solution, pouring the coating solution into a stirring container, stirring the mixture into a dispersion state by a single planet type stirrer, coating for 1 time, then pouring 80 g of coating solution into the stirring container to coat the surfaces of the beads coated for 1 time for 2 times, coating for 3 times and 4 times according to the method after the 2 nd coating is finished, measuring the surface resistance value of the particles coated for 4 times by using a QUICK499D surface resistance tester, measuring the surface resistance value of the particles coated for 4 times by using the formula to be about 350-450 ohm, and adding superconducting carbon black to account for 3%, 4%, 5%, 6%, 7% and 9% of the solid content in the coating situation during compounding and analyzing the coating situation as shown in Table 2. When the styrene-acrylic emulsion accounts for 55 percent of the solid content, 339.4 parts, 18.6 parts of superconducting carbon black, 77.2 parts of acetylene carbon black, 521.9 parts of water, 42.9 parts of dispersing agent and other conventional non-conductive auxiliary agents are weighed according to the weight.
TABLE 2
Example 3
Preparing 1000 parts of coating liquid with acetylene black accounting for 25 percent of the weight of solid content and expanded graphite accounting for 9 percent of the weight of the solid content, weighing 79.6 parts of acetylene black, 28.6 parts of expanded graphite, 286.8 parts of styrene-acrylic emulsion accounting for 45 percent of the weight of the solid content, 537.6 parts of water, 67.4 parts of dispersing agent and other non-conductive additives according to the weight, firstly, adding water and the dispersing agent into the acetylene black and the superconducting carbon black by a grinder, grinding and mixing at high speed, then, adding other conventional non-conductive additives for dispersing, and finally, adding the styrene-acrylic emulsion for uniformly stirring and dispersing by a dispersion machine to form the coating liquid; weighing 100g of polystyrene foam beads by weight, taking 80 g of coating liquid, pouring into a stirring container, stirring into a dispersion state by a single planet type stirrer, coating for 1 time, then pouring 80 g of coating liquid into the stirring container to coat the surfaces of the beads coated for 1 time for 2 times, coating for 3 times and 4 times according to the method after the 2 nd coating is finished, measuring the surface resistance value of the particles coated for 4 times by using a QUICK499D surface resistance tester, measuring the surface resistance value of the particles coated for 4 times by using the formula to be about 410-480 ohm, and adding expanded graphite to coat the polystyrene foam beads with the solid content of 6%, 9%, 12%, 15%, 18% and more than 18% during compounding, wherein the coating condition and analysis are shown in Table 3. When the styrene-acrylic emulsion accounts for 55 percent of the solid content, 339.4 parts, 27.6 parts of expanded graphite, 77.2 parts of acetylene black, 521.9 parts of water, 33.9 parts of dispersing agent and other conventional non-conductive additives are weighed according to the weight.
TABLE 3
Example 4
Preparing 1000 parts of coating liquid with acetylene black accounting for 25 percent of the weight of solid content and nano graphite accounting for 9 percent of the weight of the solid content, weighing 79.6 parts of acetylene black, 28.6 parts of nano graphite, 286.8 parts of styrene-acrylic emulsion accounting for 45 percent of the weight of the solid content, 537.6 parts of water, 67.4 parts of dispersing agent and other conventional non-conductive additives by weight, firstly adding water and the dispersing agent into the acetylene black and the superconducting carbon black by a grinder, grinding and mixing at high speed, then adding other non-conductive additives into the mixture, dispersing the mixture by a dispersion machine, and finally adding styrene-acrylic emulsion into the mixture, stirring and dispersing the mixture by the dispersion machine to obtain; weighing 100g of polystyrene foam beads by weight, taking 80 g of coating solution, pouring into a stirring container, stirring into a dispersion state by a single planet type stirrer, coating for 1 time, then pouring 80 g of coating solution into the stirring container to coat the surfaces of the beads coated for 1 time for 2 times, coating for 3 times and 4 times according to the method after the 2 nd coating is finished, measuring the surface resistance value of the particles coated for 4 times by using a QUICK499D surface resistance tester, measuring the surface resistance value of the particles coated for 4 times by using the formula to be about 560-750 ohm, and adding nano graphite to coat the polystyrene foam beads with the solid content of 6%, 9%, 12%, 15%, 18% and more than 18% in compounding and analyzing the coating condition as shown in Table 4. When the styrene-acrylic emulsion accounts for 55 percent of the solid content, 339.4 parts, 27.6 parts of nano graphite, 77.2 parts of acetylene black, 521.9 parts of water, 33.9 parts of dispersing agent and other conventional non-conductive additives are weighed according to the weight.
TABLE 4
Example 5
Preparing 1000 parts of coating liquid with acetylene black accounting for 25 percent of the weight of solid content and carbon nano tubes accounting for 6 percent of the weight of the solid content, weighing 79.6 parts of acetylene black, 19 parts of carbon nano tubes, 287.1 parts of styrene-acrylic emulsion accounting for 45 percent of the weight of the solid content, 537.6 parts of water, and 76.7 parts of dispersing agent and other conventional non-conductive additives by weight, firstly, adding water and the dispersing agent into the acetylene black and the superconducting carbon black by a grinder, grinding and mixing at high speed, then, adding other non-conductive additives into the mixture, dispersing the mixture by a dispersion machine, and finally, adding styrene-acrylic emulsion into the mixture, stirring and dispersing the mixture; weighing 100g of polystyrene foam beads by weight, taking 80 g of coating solution, pouring into a stirring container, stirring into a dispersion state by a single planet type stirrer, coating for 1 time, then pouring 80 g of coating solution into the stirring container to coat the surface of the beads coated for 1 time for 2 times, coating for 3 times and 4 times according to the method after the 2 nd coating is finished, measuring the surface resistance value after the particles coated for 4 times are completely dried overnight by using a QUICK499D surface resistance tester, measuring the surface resistance value of the particles coated for 4 times by using the formula to be about 300 ohm, and analyzing the coating condition that the added carbon nano tubes account for 3%, 4%, 5%, 6%, 7% and 9% of the solid content in compounding as shown in Table 5. When the styrene-acrylic emulsion accounts for 55 percent of the solid content, 339.4 parts, 18.6 parts of carbon nano tubes, 77.2 parts of acetylene black, 521.9 parts of water, 42.9 parts of dispersing agent and other conventional non-conductive auxiliary agents are weighed according to the weight.
TABLE 5
Claims (8)
1. A resistance value debugging method for coating carbon on the surface of a polystyrene foam bead is characterized in that acetylene black and other structural carbon are mixed to prepare coating liquid which is coated on the surface of the polystyrene foam bead; the coating liquid comprises the following raw materials in percentage by weight of solid content: 25-40% of acetylene black, 45-55% of other structural carbon, 45-55% of adhesive and the balance of other non-conductive auxiliary agents; wherein the other structural carbons are: 3 to 7 percent of superconducting carbon black, 6 to 18 percent of expanded graphite, 6 to 18 percent of nano graphite or 3 to 7 percent of carbon nano tube.
2. The method for adjusting the resistance value of the surface carbon coating of the polystyrene foam beads as claimed in claim 1, wherein the amount of acetylene black is 25%.
3. The resistance value debugging method of polystyrene foam bead surface carbon coating according to claim 1, characterized in that the other structural carbons are: superconducting carbon black Keqin EC-600JD, 10 micron expanded graphite, 0.5 micron nano graphite or 30-50 micron carbon nano tube.
4. The resistance value debugging method of polystyrene foam bead surface carbon coating according to claim 1, characterized in that the proportions of other structural carbons are: 6% of superconducting carbon black, 9-12% of expanded graphite, 9% of nano graphite and 6% of carbon nano tubes.
5. The method for adjusting the resistance of the surface-applied carbon of the polystyrene foam bead as claimed in claim 1, wherein the adhesive is styrene-acrylic emulsion, and the proportion thereof is 45%.
6. The method for adjusting the resistance of the surface-coated carbon on polystyrene foam beads according to claim 1, wherein the resistance is adjusted by a method comprisingCharacterized in that the polystyrene foam beads have a density of 20kg/m3The diameter of the small ball is 1-4 mm.
7. The method for adjusting the resistance value of the surface-coated carbon of the polystyrene foam bead as claimed in claim 1, wherein the weight mixing ratio of the polystyrene foam bead to the surface-coated carbon in each coating pass is as follows: the coating solution was 10:8, coating 4 times.
8. A resistance value debugging method for surface carbon coating of polystyrene foam pellets is characterized in that the raw material proportion is designed according to the following sheet resistance requirement, namely: when the surface resistance value is required to reach 300 ohms, coating for 4 times by adopting a mixing mode of mixing 25% of acetylene black, 6% of carbon nano tubes and 45% of styrene-acrylic emulsion in solid content weight; when the surface resistance value is 350-450 ohms, coating for 4 times by adopting a mixing mode of 25% of acetylene black, 6% of superconducting carbon black and 45% of styrene-acrylic emulsion; when the surface resistance value is required to reach 410-480 ohms, coating for 4 times by adopting a mixing mode of 25% of acetylene black, 9% of expanded graphite and 45% of styrene-acrylic emulsion; when the surface resistance value is required to reach 560-750 ohms, coating is carried out for 4 times by adopting a mixing mode of 25% of acetylene black, 9% of nano graphite and 45% of styrene-acrylic emulsion.
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| US20100304075A1 (en) * | 2009-05-28 | 2010-12-02 | Nova Chemicals Inc. | Enhanced expanded polystyrene foam insulation |
| CN103408788B (en) * | 2013-08-06 | 2015-04-08 | 南京洛普电子工程研究所 | Flame-retardance wave-absorbing polystyrene foam material and preparation method thereof |
| ES2830262T3 (en) * | 2015-03-13 | 2021-06-03 | Basf Se | Electrically conductive particle foams based on thermoplastic elastomers |
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