Anti-static clothing refers to the prevention of static electricity accumulation on the clothing, using work clothes containing conductive fibers or anti-static modified fabrics to prevent static accumulation of the human body. Applicable to the wearing of chemical, pharmaceutical, petroleum and other complex environmental conditions, is a special labor protection product to ensure the safety of workers. The good and bad anti-static performance is directly related to the safety of workers. The antistatic fabric is a fabric obtained by mixing conductive fibers or antistatic synthetic fibers or a mixture of the two at a certain ratio in a predetermined ratio. Anti-static overalls mainly use the corona discharge and leakage discharge mechanism of metal fiber, sub-conductive fiber or anti-static synthetic fiber to eliminate the charging of clothes and human body. That is to say, when grounded, the static electricity on the fabric is neutralized by the corona discharge of the conductive fiber, and can also be discharged to the earth via the conductive fiber; when it is not grounded, the weak corona discharge by means of the conductive fiber And power. The national standard clearly states that when the minimum ignition energy of combustibles is below 0.25 mJ, workers must wear anti-static clothing. The test data shows that under the same conditions, the human body voltage when wearing pure cotton overalls is about 10 times that of anti-static overalls. Anti-static overalls can effectively suppress static electricity in the human body and clothing, eliminating or reducing the electrostatic discharge hazard. In the test, the electrostatic discharge can ignite the acetone with a minimum ignition energy of 1.15 m J, which means that in most petrochemical enterprises with a minimum ignition energy of less than 1 mJ, there is a greater risk of electrostatic explosion. Therefore, you must wear qualified anti-static clothing, the amount of charged charge must be in accordance with the relevant provisions of the national standard on the amount of charged charge.
Even if it is a qualified anti-static clothing, the static conduction function may be reduced after improper wearing or after repeated washing. The data of water washing experiments show that the antistatic performance of antistatic overalls will decrease after being washed and washed. The surface density of electric charge will increase with the increase of washing time, and with the accumulation of washing time, The magnitude of the increase in charge surface density will also increase. During the washing process, due to the breakage of the conductive fibers or the destruction of the conductive layer, the corona discharge and the charge leakage are not well exhibited, so that the performance of the antistatic garment is degraded. The friction between the anti-static overalls and the human body, between other clothing and the external environment, and various bending actions of the body during work can lead to changes in the structure of the conductive fibers and reduce the antistatic performance of the antistatic clothing. Therefore, the antistatic clothing must ensure a certain degree of washability and durability, that is, it maintains acceptable antistatic properties after a certain number of wear and wash. The washing procedure in the national standard simulates the process of wearing and washing the antistatic clothing, and specifies the washing method, the number of washings and the amount of charged electric charge after washing. At present, widely used fabrics are often embedded with conductive fibers to improve the antistatic properties, and have been tested to prove that they have good washing resistance.
Anti-static clothing should be tested regularly to determine whether its anti-static performance is qualified, or if it is conditional, periodically replace it to prevent the anti-static clothing function from being reduced due to wear and wash, and small to ensure its anti-static use.
