【Summary】:

The development of silicone conductive materials has gone through several stages of single, coexisting and special. The first conductive rubber materials used the screen printing technology of conductive ink, that is, the conductive ink was screen printed to the silicone contacts through a specific mesh screen. It is characterized by simplicity, convenience and high molding efficiency, but the disadvantages are obvious: uneven silk screen coating, poor adhesion, incomplete coverage, short life and limited application range. Many key products need to use contact switches and dome sheets as conductive points. The second material is pad printing conductive ink. The conductive ink is dot-printed by the pad printing machine and the method of mold tooling.

The development of silicone conductive materials has gone through several stages of single, coexisting and special.

The first conductive rubber materials used the screen printing technology of conductive ink, that is, the conductive ink was screen printed to the silicone contacts through a specific mesh screen. It is characterized by simplicity, convenience and high molding efficiency, but the disadvantages are obvious: uneven silk screen coating, poor adhesion, incomplete coverage, short life and limited application range. Many key products need to use contact switches and dome sheets as conductive points.

The second material is pad printing conductive ink. The conductive ink is dot-printed to the silicone contacts through a pad printing machine and a mold tooling method. Its characteristics are accurate position, uniform coating, smooth surface, but the disadvantage is that the thickness is small and not wear-resistant. In the past, it was often found that the buttons of the TV remote control failed after being used for a period of time. When disassembling and checking, the conductive resistance increased after the conductive layer of the pad printing was contaminated by dust.

The above-mentioned two conductive materials have low cost and convenient processing. At the beginning of the rise of conductive silica gel, they were in a dominant low position. And because of its limitations, it restricts the promotion and development of the popular use of silicone materials in electronic products.

Later, the finished conductive particle material appeared, which was made by mixing a certain proportion of carbon powder with silicone material combined with silicone oil and auxiliary additives. Generally, it is a regular round particle, the diameter is from 2.00MM to 8.00MM, every 0.50MM is a classification, and the thickness is generally between 0.3-0.6MM. This material is carried out at the same time as the silicone molding, and the conductive particles and the silicone key body are combined together at one time with high temperature and high pressure. Its advantages are very obvious: strong adhesion, full coverage, superior electrical conductivity, and anti-oxidation. And the resistance decays slowly and the life is very long. With this conductive material, the use of silicone buttons covers almost all electronic industries, gradually replacing mechanical switches and membrane switches, and advancing to higher-grade electronic and electrical products.

With the demand for life and quality of automotive electronics and military products, the use of metal conductive particles has been born. The main material of the gold particles is nickel, the surface is coated with 18K gold by a special process, and the backside is adhesively bonded to the silica gel affinity material. It is also operated by one-time molding of abrasive tools. It is characterized by strong anti-oxidation, high electrical conductivity (almost zero resistance), long life, strong adhesion, and resistance to transient currents. The quality is very stable. Such materials combined with keys are widely used in automotive electronic components, and military control keyboards, such as missiles, aircraft, radar and so on. The disadvantage is that the cost is high and the production efficiency is low. Therefore, when the cost of the conductive material of silica carbon particles can be ignored, the cost of using metal particles needs to be calculated by particles.

Gradually, beyond the field of metal particles, high-end products such as superconducting particles (resistance 10-20 ohms), silver particles (resistance 1 ohm), green particles (resistance 0 ohms), etc.

Many customers only require the resistance value of the conductive material. We will select the conductive material according to the use environment and weight requirements of the customer's products. In order to meet the needs of customers from the aspects of cost, quality and so on.

Jiaxing Fanya Silicone Products Co., Ltd.