Method for preparing conductive polyaniline electromagnetic interference screening paint

A technology of electromagnetic interference shielding and conductive polyaniline, applied in conductive coatings, polyester coatings, reflective/signal coatings, etc., can solve the problems of reduced electromagnetic interference shielding efficiency, large proportion of metal fillers, and difficulty in melting

Inactive Publication Date: 2005-06-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many deficiencies in the metal-based electromagnetic interference shielding coatings widely used at present
First, the skin depth of metal materials is shallow, so that the shielding effect is mainly due to reflection loss, which limits their application in absorption-based occasions, such as military applications; second, the metal fillers used in coatings (such as powder, Flake or fibrous silver, nickel, copper, etc.) are expensive, and the manufacturing process is complicated and difficult to process; third, the metal filler has a large proportion, and there are certain difficulties in the transportation and long-term storage of the coating; fourth, the metal filler is prone to Migration or corrosion will cause a sharp drop in EMI shielding effectiveness, which is not conducive to the miniaturization of electronic products; fifth, the density of metal fillers is high, and the resulting coating will significantly increase the weight of the product, which limits its application in aerospace and other fields
[0004] Polyaniline is a conductive polymer material with low density (about 1.3g / cm 3 ), simple synthesis, good environmental stability, etc., but its application is limited due to its poor solubility and difficulty in melting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Add 10 parts of aniline monomer to 400 parts of hydrochloric acid solution with a concentration of 20% by mass, and stir for 5 minutes; at 20°C, under constant stirring, gradually add 100 parts of ammonium persulfate with a concentration of 15% by mass After adding the hydrochloric acid solution, continue to react for 0.5h, filter and wash to remove water-soluble impurities, and dry at 40°C to obtain a dry powder; place the above-mentioned dry powder in ammonia water with a concentration of 5% by mass for 1 hour, and add ammonia water The pH value of the treatment solution is 9. After the completion, filter and wash until the filtrate is neutral, and dry at 50°C to obtain polyaniline or polyaniline-wrapped composite particles; take 100 parts of the above particles, and 30 parts of 0.5M concentration Mix the p-toluenesulfonic acid solution, stir for 3 hours, after the end, filter and dry under vacuum at 40°C to obtain conductive polyaniline or its composite pow...

Embodiment 2

[0012] Example 2: Add 15 parts of aniline monomer to 600 parts of sulfuric acid solution with a mass percent concentration of 30%, and stir for 10 minutes; at 0°C, add 50 parts of polyacrylic resin powder with a particle size of less than 500 microns to the above-mentioned In the system; under uniform stirring, gradually add 80 parts of nitric acid solution with a mass percent concentration of 3% potassium dichromate, continue to react for 4 hours after adding, filter and wash to remove water-soluble impurities, and dry at 46°C to obtain a dry powder; The dry powder obtained above was treated in ammonia water with a mass percentage concentration of 1% for 1.5 hours, and the amount of ammonia water was added to make the pH value of the treatment liquid 8. After the end, it was filtered and washed until the filtrate was neutral, and dried at 46°C to obtain polyaniline or polyaniline-wrapped composite particles; take 100 parts of the above particles, mix with 60 parts of acetic ac...

Embodiment 3

[0013] Example 3: 15 parts of aniline monomer was added to 500 parts of nitric acid solution with a concentration of 50% by mass, and stirred for 20 minutes; at 10°C, 100 parts of polymethacrylic resin powder with a particle size of less than 500 microns were mixed Add to the above system; under uniform stirring, gradually add 60 parts of sulfuric acid solution of potassium permanganate with a concentration of 10% by mass, continue to react for 2.0 hours after adding, filter and wash to remove water-soluble impurities, and dry at 42°C to obtain dry Powder; the dry powder obtained above is placed in ammonia water with a mass percentage concentration of 6% for 1.3 hours, and the amount of ammonia water is added to make the pH value of the treatment liquid 8. After the end, filter and wash until the filtrate is neutral, and dry at 48 ° C. Obtain polyaniline or polyaniline-wrapped composite particles; take 100 parts of the above particles, mix with 2 parts of perchloric acid with a...

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Abstract

Disclosed is a method for preparing a conducting polyanion electromagnetic disturbance shielding coating, which uses conducting high molecular polyanion as the main conducting component, thermoplasticity resin as the mains film forming substance. The polyanion electromagnetic disturbance shielding coating has solved problems existing in that belongs to metal system,with advantages like light weigh,low prince good stability,convenient strange and constrction. Bsides,it does not need to used polyanion solution,making the application of conducting polyanion easier, more convenient and have lower cost. Mixing polyanion with different conductivity and inorganic filler can realize electromagnetic disturbance shielding with wider range of frequency, with higher shielding effect.

Description

technical field [0001] The invention relates to a preparation method of an electromagnetic interference shielding paint, in particular to a preparation method of a conductive polyaniline electromagnetic interference shielding paint. Background technique [0002] At present, the problem of electromagnetic interference (EMI) (also called electromagnetic pollution) caused by the widespread use of more and more electronic instruments, computers and radio communication equipment is becoming more and more serious. The harm caused by EMI is mainly manifested in the following aspects: (1) It is easy to cause various electronic equipment to malfunction, distort signals such as images or sounds, or even fail to work; (2) Shorten the service life of electronic equipment or cause electronic equipment (3) Common electrical appliances such as mobile phones, computers, game consoles, microwave ovens, televisions and other sources of electromagnetic radiation, the strong radiation formed po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/24C09D5/33C09D167/00C09D179/02
Inventor 井新利王杨勇
Owner XI AN JIAOTONG UNIV
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