The latest anti-static epoxy coating

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New anti-static epoxy coating

New anti-static epoxy coating

March 17, 2004

the research on anti-static coating in China has been quite active in recent years, and its development can be roughly divided into two categories: (1) intrinsic type: obtain conductivity by preparing a macromolecule with conjugated π bond through molecular design, such as polyethylene, polypyrrole, polyphenylene sulfide, polyaniline, etc; (2) Add the arrow type of activity bias on the outside of the appropriate part: obtain conductivity by adding conductive substances to polymer materials. Such as carbon series (carbon black, carbon fiber, graphite), metal powder (silver powder, copper powder, nickel powder), semiconductor metal oxide (tin oxide, iron oxide, magnesium oxide), organic synthetic ionic antistatic additives. The synthesis of intrinsic conductive polymer materials with conjugated π bonds is a very active research field at present, but it has not yet moved from laboratory research to practical stage. Its main disadvantages are: high manufacturing cost, complex preparation process, difficult to control, and this kind of polymer is difficult to dissolve in general organic solvents, so it is difficult to construct by ordinary methods. Additive anti-static coating is the most common one at present, and some kinds have been commercialized, such as carbon series anti-static coating, whose good conductivity has been widely used in various fields, especially in petrochemical industry. But its adhesion and oil resistance are poor, and its color is ugly; At present, anti-static coatings based on metal powder are not widely used, mainly because of their high price and high oxidizability ratio on the metal surface; Antistatic coatings with semiconductor oxides were developed by Germany, France, Japan and the United States in the 1990s, and have been partially commercialized. However, due to the high manufacturing cost and the high proportion of semiconductor oxide itself, its promotion is limited; Organic synthetic ionic antistatic coating additive is a kind of surfactant, which has poor stability, slow charge leakage speed and durability, which also hinders its use. The new anti-static epoxy coating basically overcomes the shortcomings of the above anti-static coatings, and is gradually applied to the fields of electronics, medicine, military industry, precision machinery, instruments and so on

performance of new epoxy antistatic coatings epoxy antistatic coatings are divided into solvent-free and solvent-free. The former is composed of epoxy resin, additives, composite conductive pigments, fillers, coloring pigments and mixed solvents, with polyamide resin as the curing system, and the latter is composed of epoxy resin additives, composite conductive pigments, active diluents, other pigments and fillers, with modified polyamines as the curing system. The improved coating still has the properties of epoxy resin coating. The paint film has excellent adhesion to polar substrates such as metal (steel, aluminum, etc.), ceramics, glass, concrete, wood, terrazzo, epoxy resin insulation board, etc; At the same time, its excellent chemical resistance ensures the consistency of system sampling and good high-speed and effective control function. Because there are no alkyl, ether and ester bonds in the resin, the alkali resistance is particularly prominent. Because the epoxy resin coating is solidified and has a three-dimensional structure, and is resistant to oil impregnation, it has been widely used in the inner wall lining of the integral oil tank of oil tanks, oil tankers and aircraft. The new epoxy anti-static coating also has the following characteristics: (1) good conductivity and attention: strong durability. The conductive composite filler in the coating is a composite material obtained by taking a cheap and light material as the base or coil, such as mica powder, and coating its surface with one or more layers of conductive substances with chemical stability, strong corrosion resistance and high conductivity. Mica particles are flaky and have a large surface area, which is conducive to dispersion in the resin. Why do foreigners use metal surfaces? The function of this layer of metal surface is heat reflection and mutual contact. Its volume resistivity can reach 40 Ω· cm. At the same time, the characteristics of semiconductor oxide determine that it has permanent conductivity. (2) The color is adjustable. Due to the light color of conductive composite filler, anti-static coatings of different colors can be obtained by matching with other pigments

at present, epoxy anti-static coatings are mainly used in floors and oil storage tanks in places requiring anti-static such as electronics, communications, printing, machine rooms, precision machinery, powder, chemistry, military industry, aerospace, etc. Taking the epoxy anti-static coating developed by our company as an example, the construction procedure is as follows: Primer: roll brush 1 ~ 2 times of anti-static primer (PC10); Grounding copper: lay grounding copper according to the design, and brush and fill the trench joints with conductive putty (decide whether to construct according to the needs); Intermediate coating: use anti-static intermediate coating (kccm) mixed with quartz sand or quartz powder for brushing and leveling; Surface coating: spraying or roller brushing solvent based epoxy anti-static surface coating (kccec); Use a flat knife or trowel to brush solvent-free epoxy resin and anti-static surface coating (kccef); Floor thickness: 0.3 ~ 2.0mm

with the development of science and technology and the gradual improvement of environmental requirements, new epoxy anti-static coatings are not only applied to floors, but also gradually penetrated into the electronic industry, such as SMT, pqcr and other plates. At present, the epoxy resin insulation plate used can be brushed with solvent-based epoxy anti-static paint or directly made of solvent-free epoxy anti-static paint to eliminate the harm caused by static electricity

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