Performance parameter editing
Classified according to different purposes: anti-static materials, conductive materials,
electromagnetic shielding material.
Aluminum coated fiberglass is prepared by hot-dip coating method,
There are three varieties: semi coated aluminum layer accounts for 40% of the fiber outer layer area (civilian)
Full package type (civilian)
Hollow type (high military cost) glass composition: E-glass
Diameter: 25-35 microns
Aluminum layer thickness: 2-7 microns
DC specific resistance: less than 3.5 ohms CM
Aluminum content: 40-50%
Fiber specific gravity: 2.7 grams per cubic centimeter
Dispersion rate: 70%
Tensile strength 54000 KN/m * 2
Fiberglass length: greater than 1MM can be cut to any length as needed
The filling ratio in composite conductive polymer materials is 15-35% (weight ratio)
Scope of application editing
Can be compounded with various resins such as polyethylene, polyester, nylon, polyvinyl chloride, polypropylene, polystyrene, silicone resin, fluororesin, etc. Can be added according to different purposes: coupling agents such as silicate and titanate, surfactants, and can also be mixed with other conductive fillers in the basic resin.
Silver based conductive filler editor
Silver conductive paintThe market sales representative model includes YB-828 conductive paint, which has the best conductivity, slow oxidation rate, and conductive oxidation products. It has good thermal conductivity, excellent resistance to media, and excellent shielding effect (surface resistivity below 0.010 Ω/cm, can reach over 75dB in the range of up to 10GHz). However, silver as a conductive filler also has some problems: it is expensive and limited to use only in environments with extremely strict shielding requirements; The migration of silver will bring difficulties to the miniaturization of electronic products. The so-called migration of silver refers to the phenomenon where silver from the anode grows in a dendritic shape at the cathode when a direct current flows through silver as an electrode, resulting in a short circuit. The most effective way to prevent silver migration is to minimize the moisture in the coating as much as possible.
Copper based conductive filler editor
Copper powder has a moderate price and excellent conductivity, but it is limited by its susceptibility to oxidation in air and the non-conductive nature of oxides. At present, significant progress has been made in the antioxidant technology of copper powder, which is currently the most commercially valuable conductive filler. At present, the main techniques for anti-oxidation of copper powder include: (1) surface coating with inert metals (Ag, Al, Ni, etc.); (2) adding reducing agents to reduce the oxidized copper on the surface of copper powder; (3) Organic phosphide treatment; (4) Polymer dilute solution treatment; (5) Treat with coupling agent. In practical applications, in order to achieve better antioxidant effects, the above methods can be comprehensively applied. Surface coating with silver is currently the most widely used method, with a surface resistivity of 0.075-0.10 Ω/cm and a shielding performance of 75dB in the range of over 1GHz. The widely used silver copper conductive paint now is the one that uses silver plated silver coated copper powder (market sales representative model: T3 silver coated copper powder) as a filler (market sales representative model: TF-801 silver copper conductive paint).
Nickel based conductive filler editor
The price of nickel powder is also relatively moderate, and its antioxidant properties are between silver powder and copper powder. Therefore, there is no need for antioxidant treatment during use, and the good hardness provides excellent durability for the coating. The conductivity of nickel is lower than that of silver and copper, with a surface resistivity of 1 Ω/cm and a shielding effect of up to 60-65dB (5-1800 MHz). Nickel conductive paint (market sales representative model: YB-606 nickel conductive paint) has a lower shielding effect in the low-frequency range (below 30MHz) than copper conductive paint (market sales representative model: YB-801 copper conductive paint). But nickel conductive paint (market representative model: TF-606 nickel conductive paint) has high magnetic permeability, large attenuation amplitude of magnetic vector, and strong ability to absorb electromagnetic interference. Nickel has excellent oxidation resistance and chemical corrosion resistance, which can fully meet the application requirements. Therefore, nickel conductive paint (represented by the market sales model YB-606 nickel conductive paint) occupies a large proportion in the coating category. Electrodag 550 produced by Acheson Corporation in the United States
Nickel based shielding coatingIt has been applied for 20 years. In recent years, Sichuan University in China has conducted extensive research on nickel based conductive coatings and made great progress.
Carbon based conductive filler editor
Carbon based conductive fillers mainly include carbon black and graphite. Divided by shape, there are mainly two categories: powder and fiber. When manufacturing conductive coatings, graphite is often mixed with carbon black or carbon black with different properties is mixed to meet different usage requirements. Due to the fact that carbon based conductive fillers belong to semiconductors, the conductivity of the coatings formed is much lower than that of conductive coatings formed by metal based fillers. Their surface resistivity is 30-50 Ω/cm, and the shielding effect can reach up to 30-50dB (50-450MHz). They are only used in environments with lower shielding requirements to save costs. In recent years, a series of achievements have been made in the research of ultrafine carbon black, greatly improving its shielding performance. The United States has developed an ultrafine carbon black that can be used to manufacture electromagnetic shielding materials. Such as Cabot's "Super Conductive" carbon black and Columbia Chemical's "Conductiex40-220" carbon black. The ultra-fine carbon black/PP developed by Mitsubishi Rayon in Japan has a density of 118g/cm3 and a shielding effect of 40dB, which is known as the lightest in the world
electromagnetic shielding material.
Composite conductive filler editing
In order to reduce the cost of conductive fillers and improve their conductivity, composite conductive fillers are often used. Composite conductive fillers can be divided into composite powders and composite fibers according to their shapes. According to the different core materials, metal coated composite powders can be divided into three types: metal metal (such as Ag/Cu), metal non-metal (such as Cu/graphite), and metal ceramic (such as Ag/SiO2). In addition, there are metal oxide coated composite powders. There are various types of composite fibers, such as nylon, glass fiber, carbon fiber, etc., which are coated with metals or metal oxides. This type of conductive filler is generally used as an additive to the above-mentioned main fillers to fine tune the shielding performance of conductive coatings, in order to flexibly adapt to the needs of various situations.
Conductive glass powder editor
(The market is mainly represented by advanced technology institutes)
The specification of silver plated conductive glass microspheres is controlled by a complete set of quality analysis instruments during the production of each CONDUCT-O-FIL product, to ensure that their quality parameters meet the predetermined performance specifications before leaving the factory. Product parameters typically include: silver content, powder resistivity, color grading, apparent density, silver adhesion, effects of silver plating defects, and particle size distribution.
Silver plated solid glass microspheres with a silver coating of 0.01-0.0001 ohm cm have excellent adhesion to glass and meet the requirements of the US military to resist vibration and electromagnetic impact. Chemical inertness, high temperature stability, no decrease in electrical conductivity of silver plated particles due to time and temperature oxidation, low density - reduces weight, improves dispersibility and rheological properties of resin substrates. Used for producing EMI silicone gaskets, adhesives, paints, and other products.
Silver plated hollow glass microspheres with a thickness of 0.1-0.01 ohm cm provide excellent adhesion of silver to the glass surface. Low density avoids particle settling, improves dispersibility, and enhances the rheological properties of the resin substrate. Produce EMI silicone gaskets, adhesives, paints, and other products.
Main features: acid and alkali resistance, with excellent antioxidant properties; Can replace pure silver powder to reduce costs;
Main applications: Mainly used in
Superconducting silicone rubber， FIP conductive silicone rubber, conductive adhesive, epoxy conductive adhesive
Nickel coated copper powder editor
Nickel coated copper powder is currently the most ideal conductive filler for conductive silicone rubber, with excellent conductivity and electromagnetic wave shielding properties. It has good oxidation resistance during high-temperature forming of conductive rubber and has a considerable service life in various environments with corrosion resistance (salt spray test), ensuring a 100% pass rate of the product. Compared to silver plated products such as silver plated glass microspheres and pure silver powder, it has a strong cost advantage. Not causing supply instability due to rising silver prices. Nickel coated copper has comparable supply and price stability performance. It is the dominant filling powder for conductive silicone rubber in the future. At present, the main representative models in the market are Advanced Institute W-5 nickel coated copper powder. characteristic:
Used on conductive rubber, it has excellent electrical and shielding properties, as well as good physical and mechanical properties and water vapor sealing performance. The main reason for this comprehensive performance is the two networks formed inside the rubber.
The network structure of polymer chains formed after rubber vulcanization provides physical and mechanical properties with rubber characteristics, such as resilience and compression performance. Water vapor sealing performance, etc.
2. A three-dimensional conductive network formed by the close packing of conductive particles within a rubber network, which provides the electrical and shielding properties required for the product.
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