Classification and performance testing standards for conductive paints (shielding coatings) Precautions for using conductive paint: ① The service life is greatly influenced by environmental factors, such as humidity, temperature difference, sunlight, etc. The above data is for reference only. ② Metal powder type conductive paints are not alcohol resistant. Due to the difference between conductive paint and ordinary paint or varnish, in order to form better conductivity, metal particles inside the conductive paint account for It is difficult to form a strong paint film layer like ordinary varnish or color paint wrapped in resin

First of all, let's understand a phenomenon. When electronic equipment is working, it neither wants to be interfered by external electromagnetic waves, nor does it want to radiate electromagnetic waves to interfere with external equipment, as well as radiation hazards to human body. Therefore, it is necessary to block the propagation path of electromagnetic waves. This is electromagnetic shielding.

The main uses of conductive coatings are as follows: 1. It can be used to protect the space near the antenna, radio station, television station, transmission network or line of the mobile communication system; 2. In stores, laboratories, national defense and research facilities, wireless network data can be prevented from being intercepted (data stealing), and conference rooms or offices can be protected; 3. Protect radar radiation in military facilities or airports; 4. It can prevent incorrect measurement of patients in medical treatment; 5. Protect confidential areas and R & D departments in industry; 6. Block unauthorized non mobile phone calls in prison; 7. It can also be used in data center, technology area, school, children's room, hotel room, hospital area, recording studio, library, church, etc.

I. performance advantages: Shielding coating: stable conductivity, wide coverage, can meet the requirements of customers, can pass the test of testing institutions, many high-end products are shielded by shielding coating. Vacuum plating: poor conductivity, poor coverage, such as corner, column and other places can not be electroplated, so it can not achieve a very ideal shielding effect.

Conductive paint is to add conductive powder such as silver, copper, nickel or graphite into the varnish, so that the obtained paint layer has conductivity. Commonly used varnish is polyurethane or acrylic varnish. In addition, anti precipitation agent and dispersant are often added to reduce the sedimentation rate of conductive powder and make it well dispersed. In order to prevent the oxidation of conductive powder, antioxidants are often added. The commonly used conductive powder is nickel powder. The coating process is as follows:

Precautions for use of silver copper conductive paint: Before use, the paint shall be completely stirred in the paint tank evenly before use. After stirring, the silver copper metal particles are evenly dispersed, and the coating film can achieve the conductivity. After the paint is diluted, it is better to mix it frequently for not less than 5min. Mix it once to achieve the best conductive effect after coating; the diluted product should be used up as soon as possible to avoid For long-term storage, it is easy to precipitate after dilution, but it does not affect the effect of use characteristics after mixing. Protective measures: during use, ensure the working environment is well ventilated and avoid long-term direct Do not pour the paint into the water channel or sewer to pollute the environment.

Conductive paint - as the name implies, it is a kind of paint that can conduct electricity, but it is not the paint itself that can conduct electricity, but the paint film can form a conductive coating layer after drying. The reason why the conductive film layer can conduct electricity is that the film layer is a thin conductive film composed of conductive powder particles or pieces of contact.

Conductive paint is a popular name. There are many products called conductive paint on the market. It can be divided into two categories according to application, conductivity and material. That is, metal conductive paint and non-metal conductive paint. Nonmetallic conductive paint is a kind of common paint which can conduct electricity by adding some additives. Its conductivity is usually in the range of tens of thousands to millions of ohms. Mainly used for anti-static function, such as: floor paint.

Some customers use conductive paint when spraying good measurement of non-conductive or resistance value is very large, what is the reason? The measurement of the conductive paint sprayed on the shell can be done with a general digital multimeter. The conductivity of the sprayed product can be measured only after it is completely dry. Set the multimeter to the 200 Ω position (note that here is the resistance value below 200 Ω). First, put the two positive and negative level probes together tightly and look at the resistance value between the probes after the number is stable. Then test the resistance between two points. The conductivity between two points of the product can be obtained by subtracting the value of the probe from the measured value.

Conductive paint is a kind of paint with good conductivity. When spraying, we have the following process. One. Preparation before spraying conductive paint: (1) gun diameter: 0.5mm? -0.8mm? (2) paint dilution ratio: silver copper conductive paint: diluent = 1:0.5 (weight ratio) II. Construction method of spraying conductive paint:

Anti electromagnetic interference shielding coating. Commonly known as: conductive paint. The conductive paint is a kind of paint with good conductive performance, which uses composite particles such as copper and silver as conductive particles Conductive coating is a kind of special functional coating with the rapid development of modern science and technology. In 1948, the United States issued a patent to make conductive adhesive from silver and epoxy resin, which is the first conductive coating to be disclosed. China also began to research and apply conductive coatings in the 1950s. In recent decades, conductive coatings have been applied in many military and civil industries, such as electronics, electrical appliances, aviation, chemical industry, printing, etc. Accordingly, the theoretical research of conductive coatings has been developed rapidly, and promoted the maturity and perfection of application technology.

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