Electromagnetic shielding polyamide material and preparation method thereof

Abstract

The invention relates to the technical field of polyamide material modification, in particular to an electromagnetic shielding polyamide material and a preparation method thereof. The electromagneticshielding polyamide material is prepared from the following raw materials in parts by weight: 75-85 parts of polyamide resin, 3-5 parts of PEDOT-g-MAH:PSS conductive powder, 10-15 parts of carbon fiber, 0.5-2 parts of a silane coupling agent, 0.1-0.5 part of an antioxidant and 2-3 parts of other auxiliary agents; the PEDOT-g-MAH:PSS conductive powder is prepared from 3,4-dioxyethylene thiophene, 3-thiophene acetic acid and sodium polystyrene sulfonate. The electromagnetic shielding polyamide material provided by the invention has excellent electromagnetic shielding performance and can effectively reduce the percolation threshold of carbon fiber in a composite material, and meanwhile, the material has excellent mechanical properties; a preparation process of the material is simple and easyto operate, and has an important practical application value.

Description

technical field [0001] The invention relates to the technical field of polyamide material modification, in particular to an electromagnetic shielding polyamide material and a preparation method thereof. Background technique [0002] Electromagnetic waves generated by electronic equipment will not only interact with other electronic equipment and cause electronic interference, but also cause damage to people and the environment. Electromagnetic compatibility has become one of the most important quality indicators for electronic products. At present, electromagnetic shielding materials are generally used to protect electronic equipment. The polymer-based electromagnetic shielding material is mainly used in the inner layer of the electromagnetic shielding body. The eddy current generated by the interference magnetic field and the electromagnetic induction on the surface of the material is used to form a reverse magnetic field to offset the dissipation of electromagnetic waves. ...

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Problems solved by technology

[0003] At present, polymer-based electromagnetic shielding materials are mainly conductive coatings, which mainly have the following disadvantages: (1) The solvents used are volatile organic compounds, which pollute the environment; (2) The spraying process is complicated, the construction is cumbersome, and the labor cost is high; (3) The yield rate of the product is low; (4) The service life is low, and the coating is easy to peel off after aging

[0004] Polymer-based electromagnetic shielding materials mainly use metals and carbon-based materials as fillers. Metal materials have excellent electrical conductivity and excellent shielding effect, but they have the following disadvantages: (1) The price is expensive; (2) The material is easy to oxidize, and the oxide has no Conductivity, causing material failure and low service life; (3) metals are easy to migrate from anode to cathode inside the material, and long-term use will show dendritic growth inside the material, resulting in short circuit, resulting in material failure, and difficulty in miniaturization of electronic equipment. limited in scope;

Due to the characteristics of the material itself, its percolation threshold in the polymer matrix is ​​high, and a high filling amount is required to achieve the effect of electromagnetic shielding. A large amount of fillers is poorly dispersed in the matrix and is prone to agglomeration, which not only affects the electrical properties and mechanics of the material. performance, also increases material cost

[0006] Chinese patent CN102690514 proposes a preparation method of electromagnetic shielding nylon composite material, the disclosure date is September 26, 2012; through the combination of nylon 610, carbon fiber and 3-thiocyanatopropyltriethoxysilane, a It is a material with excellent electromagnetic shielding effect, and its surface resistivity can reach 0.018Ω·cm, but the carbon fiber content of this material has reached 30%, and the cost is still high. The material is very difficult, and the dispersion effect is poor. In addition, a large amount of conductive dust will accumulate during long-term production, which will easily cause safety hazards such as motor short circuit.

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