Some domestic manufacturers began to produce antistatic agent for electric double-layer electrification. The charge generated by the antistatic agent is opposite to the charge carried by the fiber when it is rubbed, so the phenomenon of electric neutralization occurs, which reduces the surface charge of the fiber and improves the electrostatic property. At the same time, the antistatic property of the product will not be affected by the change of air humidity
the action mechanism of antistatic agent for nonwovens is mainly manifested in two aspects: one is to form a conductive layer on the surface of the material to reduce the resistivity and make the generated static charge leak quickly; the other is to form a conductive layer on the surface of the material to reduce the resistivity; The other is to endow the material surface with certain lubricity and reduce the friction coefficient, so as to inhibit and reduce the generation of static charge
when using antistatic agent for nonwovens, it must meet the following conditions: less dosage, good effect, convenient use, appropriate price, no physical or chemical adverse effects on fibers, etc. For products with temporary demand, they can be removed after use. For products with durability and antistatic performance, they should have friction resistance, washing resistance and dry cleaning resistance
antistatic agents for nonwovens are developing rapidly abroad, especially in developed countries such as the United States and Japan. The production and sales of antistatic agents are in the forefront of the world. The development of foreign antistatic agents tends to be durable, good heat resistance, wide applicability and variety serialization. 1n addition, the varieties of solid antistatic agents used for measurement and processing are also increasing
however, in China, “improving the moisture absorption of fibers” is the main way for most antistatic nonwovens manufacturers to use antistatic agents. Finish with hydrophilic nonionic surfactant or polymer. The antistatic effect of surfactant is that it can form a directional adsorption layer on the fiber surface. 1n the adsorption layer, the hydrophobic end of surfactant attracts the hydrophobic fiber, while the hydrophilic end points to air, forming a hydrophilic film on the fiber surface. Thus, the moisture absorption of the fiber is improved, the charge dissipation efficiency is accelerated, the electrostatic accumulation is reduced, the surface resistance of the fiber is reduced, and the antistatic effect is achieved. But this kind of finishing agent will affect its antistatic performance because of the decrease of air humidity
however, it is gratifying that some domestic manufacturers have started trial production of electric double-layer antistatic agent. This antistatic agent is essentially ionization and adsorption caused by interfacial polarization, or electrokinetic phenomenon caused by the affinity of resistance, which forms a charge layer in the very thin surface layer. Generally speaking, acidic polymers are easy to lose positive ions and form negative charged surfaces, while alkaline polymers are on the contrary. Because the charge generated by antistatic agent is opposite to that of fiber friction, the phenomenon of electric neutralization occurs, which reduces the surface charge of fiber and improves the electrostatic property. At the same time, the antistatic property of the product will not be affected by the change of air humidity. 1t is understood that at present, it can be used to produce this kind of antistatic agent with special electricity dissipation effect, and the raw materials include polyurethane, 640 oil agent, etc
it should be noted that in the process of antistatic finishing of nonwovens, rolling liquid rate, rolling speed, setting temperature and time will also affect the finishing effect. When the rolling liquid rate is too low, it is difficult for antistatic agent to form a continuous hydrophilic conductive layer on the fiber surface, and the antistatic effect is poor; The results show that the rolling liquid rate is too high, it is not easy to dry after finishing, the setting effect is not good, and the antistatic hydrophobic group does not co melt with the fiber, which is easy to lead to charge accumulation, thus reducing or affecting the antistatic effect; 1f the vehicle speed is too fast, the antistatic agent of nonwovens will be completely soaked, and the two can not be fully co fused, and the continuous, complete and relatively uniform hydrophilic conductive layer can not be formed on the surface of nonwovens. 1n addition, if the setting temperature is too low and the setting time is too short, the fabric electrode can not be fully co fused with the polyester fiber, so it is difficult to form a good hydrophilic conductive layer and achieve good antistatic effect; On the contrary, it is easy to cause the heat loss of the substrate, and then cause the deterioration of other properties and waste of energy
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