Principle and application method of conductive adhesive

Conductive adhesive, an adhesive that exhibits specific conductive properties after curing or drying, its unique conductive properties and a wide range of application scenarios make it an important and indispensable material in the electronics industry.

I. In-depth analysis of the principle of electrical conductivity

The conductive properties of conductive adhesives are mainly due to their internal conductive particles.Before the adhesive is cured or dried, these particles are in a discrete state and do not form a continuous contact with each other, so the whole is insulated.However, when the conductive adhesive through the curing or drying process, the solvent gradually evaporate, the adhesive volume contraction, the distance between the conductive particles to be closer, and then form a stable continuous state, thus showing the conductive properties.

Specifically, the conductive principle of conductive adhesives can be attributed to two main effects:

Contact conductivity: when the amount of conductive filler filler reaches a certain critical value, the original independent metal conductive particles began to contact each other, interwoven into a continuous network structure, the network structure makes the conductive adhesive has the ability to conduct electricity.

Tunneling effect: Electrons, as a kind of microscopic particles, have the ability to cross the tiny isolation layer between conductive particles.When the thickness of the isolation layer is reduced to a certain degree, the electrons can easily cross, the original isolation of the conductive particles between the formation of a conductive channel.This conductive channel generated by the tunneling effect can be equated to a combination of a resistance and a capacitance.

II. Application details

Conductive adhesive is relatively easy to use, but still need to pay attention to some details to ensure its conductive properties and bonding strength:

Preparation: Clean the surface to be bonded, remove oil, dust and other dirt to ensure that the conductive adhesive and the surface to be bonded to form a good contact.Stirring and mixing: After opening the package of conductive adhesive, stir and mix thoroughly to ensure that the conductive filler is evenly distributed in the adhesive.

Coating: use a scraper, brush and other tools will be evenly coated in the conductive adhesive to be bonded on the surface, pay attention to control the thickness of the coating, to avoid too thick or too thin to affect the conductive properties and bonding strength.

Curing: According to the curing instructions of the conductive adhesive, choose the appropriate curing method, such as hot pressing, UV irradiation or natural curing, etc., to ensure that the conductive adhesive is completely dry and achieve the best conductive properties and bond strength.

Test: After curing is complete, use a conductivity tester and other tools to detect whether the conductivity of the conductive adhesive meets the requirements.

III. Wide range of application scenarios

Conductive adhesives have a wide range of application scenarios in the electronics industry, including but not limited to:

Connection of electronic components: Conductive adhesive can be used for connection and fixing of electronic components, such as circuit boards inside mobile phones.

Conductive bonding: In the case where welding cannot be used, conductive adhesive can be used as a conductive bonding material, such as the touch screen of electronic products.

Electromagnetic shielding: Conductive adhesive can be used for electromagnetic wave shielding to reduce the impact of electromagnetic interference on electronic equipment.

Conductive repair: Conductive adhesive can be used to repair circuit boards and other electronic components with broken conductive paths, improving the reliability and service life of the equipment.

In summary, conductive adhesive with its unique conductive principle and easy to use, in the electronics industry plays a pivotal role.With the continuous progress of technology and application areas continue to expand, the future development prospects of conductive adhesive will be more broad.