Polyaniline electromagnetic shielding material based on cellulosic fibers and preparation method of electromagnetic shielding material

Abstract

The invention provides a polyaniline electromagnetic shielding material based on cellulosic fibers and a preparation method of the electromagnetic shielding material. The material is of a core-shell structure taking the cellulosic fibers as the core and taking doped polyaniline as the shell. The specific preparation method comprises the following steps: mixing cellulosic fibers with aniline monomers for standing, adding the mixture into an acid doped solution so as to form a solution A; dissolving an oxidizing agent into the acid doped solution so as to form a solution B, and cooling the solution A and B to the temperature of 10 DEG C below zero to 0 DEG C for later use; slowly dripping the solution B into the solution A, carrying out an oxidative polymerization reaction under the temperature of 10 DEG C below zero to 0 DEG C, filtering and washing the reaction product, and performing vacuum drying, thereby obtaining the polyaniline electromagnetic shielding material based on cellulosic fibers. Sugarcane fibers and straw fibers are taken as reaction materials, the production cost is low, the adopted in-situ chemical oxidation method is simple in conditions, the operability is high, the prepared electromagnetic shielding material is regular in arrangement of the doped polyaniline, high in degree of crystallinity and high in conductivity, has one-dimensional fiber morphology and is convenient to be overlapped to form a conductive network, and the electromagnetic shielding performance of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding materials, and in particular relates to a cellulose fiber-based polyaniline electromagnetic shielding material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the electronics industry, the number of various commercial and household electronic products has increased dramatically, and more and more components such as integrated circuits used in electronic products have become more and more miniaturized. The higher the sensitivity of electronic products, the easier it is to be interfered by external electromagnetic interference, and the electromagnetic waves formed by high-frequency pulses emitted by electronic products will also cause electromagnetic pollution. Therefore, electromagnetic shielding materials are used to eliminate or reduce electromagnetic radiation pollution, and to achieve electronic equipment and the en...

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Problems solved by technology

[0003] Electromagnetic shielding materials usually use metal and its composite materials. They have good shielding performance, but they have the disadvantages of being bulky, difficult to adjust performance, requiring secondary processing, low production efficiency and high cost. Polyaniline, polypyrrole, polyacetylene, etc. are conductive High molecular polymer is a new class. Compared with traditional conductive materials such as carbon black, graphite, and metal, conductive high polymer has good electromagnetic shielding performance, light weight, controllable permittivity, and high production efficiency. Advanced merit

Polyaniline is the most widely used conductive polymer, but polyaniline has poor solubility and processing properties. Therefore, polyaniline nanocomposites are synthesized in situ from aniline monomers in the matrix polymer, and then combined with other solubility properties and processing properties. Combination of polymers with better properties to form polyaniline-polymer composites

[0004] Chinese patent CN 102153862B discloses a preparation method of a polyaniline / carbon nanotube composite electromagnetic shielding material. Carbon nanotubes are carboxylated and then added to a hydrochloric acid solution, mixed and reacted with the hydrochloric acid solution containing aniline monomer, and vacuum-dried by suction filtration Obtain the composite material of polyaniline and carbon nanotube, the price of the carbon nanotube used in this method is more expensive, is unfavorable for market popularization and use

Chinese patent CN 103642039B discloses a wood-based polyaniline electromagnetic shielding material and its manufacturing method. After vacuuming the wood material, it is impregnated with a polyaniline prepolymer to obtain a product through in-situ polymerization, and finally the wood-based polyaniline is obtained by washing and drying. Polyaniline electromagnetic shielding material, the raw material of this shielding material is veneer, veneer, bamboo chips and other materials, the material size is large and thick, the formability is poor, and the application field is greatly restricted

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