There are many ways to generate static electricity, which is a very common natural phenomenon, but there are also many cases of property and life safety caused by static electricity explosions. Once an accident occurs, the consequences will be disastrous. Therefore, anti-static has become a necessary measure.
Learn about anti-static materials:
1. Antistatic agent for antistatic materials
The mechanism of antistatic agent is to form a water film on the surface of the product through adsorption to prevent the formation and accumulation of static electricity. Therefore, the antistatic performance of the antistatic agent depends on the ability of the antistatic agent to absorb moisture and the humidity of the environment in which the product is used. According to the difference of antistatic agent molecules, it can be divided into two categories: organic small molecule antistatic agent and permanent antistatic agent.
Organic small molecule antistatic agents are a class of organic substances with the characteristic structure of surfactants, which can be divided into four categories: cationic, anionic, nonionic and zwitterionic. The permanent antistatic agent is a kind of hydrophilic polymer with large molecular weight. The two types of antistatic agents can be coated on the surface of the product or mixed with the base resin when used. The antistatic agent directly coated on the surface of the product will be continuously lost due to washing or friction, so the antistatic agent needs to be replenished regularly to maintain stable antistatic performance; while the antistatic agent mixed inside can make up for the surface antistatic through migration The loss of the agent, so the antistatic effect is more durable. The polymer antistatic agent mixed inside the matrix has a slow migration rate, which can maintain the long-lasting antistatic performance of the product material. When using a polymer antistatic agent, adjusting and controlling its compatibility with the matrix resin is the key to technology. If the compatibility is too strong, the antistatic agent inside the matrix cannot replenish the loss on the surface of the matrix in time, and the antistatic effect cannot be achieved; if the compatibility is too weak, the antistatic agent is easy to accumulate on the surface of the matrix to accelerate the loss, and cannot achieve lasting antistatic effect.
2. Antistatic inorganic materials for antistatic materials
That is to say, the conductive or semiconducting inorganic materials are dispersed into the polymer material matrix, and the ribs or mesh paths formed by these materials conduct electricity so that the product has antistatic effect.
Inorganic antistatic materials can be divided into carbon, metal, semiconductor oxides and their composites according to the type of substance. According to the spatial structure, they can be fibrous, flake, granular and shapes with special three-dimensional structures. Divided into dark and light antistatic materials.
At present, the commonly used inorganic antistatic materials are as follows:
(1) Carbon black or graphite. Carbon black or graphite is currently the most widely used carbon-based conductive material. It has stable and permanent conductive properties, and has a wide range of sources, low cost, and is easy to use. It is the first choice for the preparation of anti-static products. During use, quite large carbon powder and graphite particles will fall off and float in the air, and the anti-static function will decay rapidly. This is why after the anti-static floor is finished, the inspection is often up to the standard, and the anti-static function decays after 1-2 years of use.
(2) Chopped conductive fibers. Including carbon fiber and metal fiber (mainly stainless steel fiber) has very low bulk resistance, and it is easy to form a linear structure of conductive network in the matrix material, so it needs to be added in a small amount. The product has stable electrical conductivity and light color. However, the conductive fibers are in the form of tows and must be fully dispersed in polymer materials to achieve good results. Due to the difficulty of dispersion, the conductivity of the product is also difficult to control.
(3) Conductive mica powder. Mica powder is a commonly used filling material for polymer materials. The sheet structure of mica powder is conducive to the formation of conductive networks in polymer materials. However, mica powder itself is not conductive, and a layer of antistatic material (such as ATO) must be deposited or coated on the surface of mica powder to play an antistatic role. Conductive mica powder has light specific gravity and light color, and can be used to process decorative products, and its application in the field of antistatic is increasing year by year.
NFJ anti-static material: NFJ metal aggregate itself is a very good conductive material. The proportion of metal aggregate is increased through foam production. The scientific grading method and mature construction technology make the metal aggregate and metal aggregate fully Effective lap joints form a dense conductive network on the ground. When the electrostatic ions reach the ground, they can form timely and effective dissipation and absorption. So that the electrostatic ions do not aggregate, and thus do not generate electrostatic discharge.
