Nonwoven Antistatic Agents Are Emerging In China.

< p > domestic manufacturers began trial production of double layers of antistatic agent.

The charge produced by the antistatic agent is opposite to that of the fiber when it is rubbed. Therefore, the phenomenon of electric neutralization leads to the decrease of the surface charge of the fiber and the enhancement of the static electricity. At the same time, the antistatic performance of the product will not be affected by the change of the air humidity.

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< p > external coating method or internal mixing method, < a href= "//www.sjfzxm.com/news/index_c.asp" > nonwoven material < /a > the mechanism of action of antistatic agent is mainly manifested in two aspects: first, the conductive layer is formed on the surface of the material, which reduces the electrical resistivity, and causes the already generated static charge to leak rapidly; two, gives the material surface certain lubricity and reduces the friction coefficient, thus restraining and reducing the generation of the static charge.

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< p > non-woven material antistatic agent must meet the requirements of less dosage, good effect, convenient use, suitable price, no physical or chemical adverse effects on fibers.

Products for temporary demand can be removed after use. For products requiring durable antistatic properties, they should be resistant to friction, washing and dry cleaning.

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< p > antistatic agents for nonwovens have been developing rapidly abroad, especially in developed countries such as the United States and Japan, both in terms of production and sales of antistatic agents.

The development of foreign antistatic agents tends to be durable, good heat resistance, wide applicability and variety serialization. In addition, the solid anti-static species used for metering and operation processing are also gradually increasing.

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< p > finishing with hydrophilic non-ionic surfactant or polymer material.

The antistatic effect of surfactant is due to its formation of a directional adsorption layer on the surface of the fiber. In the adsorption layer, the hydrophobic side of the surfactant is attracted to the hydrophobic a href= "//www.sjfzxm.com/news/index_c.asp" > fiber > /a >, while the hydrophilic terminal points to the air and forms a hydrophilic film on the surface of the fiber.

Therefore, the hygroscopicity of the fiber is improved, the charge escaping efficiency is accelerated, the electrostatic accumulation is reduced, the surface resistance of the fiber is reduced, and the antistatic effect is achieved.

However, the antistatic properties of these finishing agents will be affected by the decrease of air humidity.

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< p > but it is gratifying that domestic manufacturers began trial production < a href= "//www.sjfzxm.com/news/index_c.asp" > electric double layer < /a > antistatic agent.

This antistatic agent is essentially an electric phenomenon caused by the polarization of the interface, or an electric phenomenon caused by the affinity of the resistance, and forms a charge layer in the very thin surface.

Generally speaking, acidic polymers are liable to lose positive ions and form negative charged surfaces, whereas alkaline polymers are opposite.

Because the charge produced by the antistatic agent is opposite to that of the fiber when it is rubbing, the phenomenon of electric neutralization results in the decrease of the surface charge of the fiber and the increase of its static electricity. At the same time, the antistatic performance of the product will not be affected by the change of the air humidity.

It is understood that at present can be used to produce this kind of special antistatic agent antistatic agent has polyurethane, 640 oil and so on.

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< p > special attention should be paid to the effect of rolling rate, rolling speed, setting temperature and time during the antistatic finishing of nonwoven fabrics.

When the rolling rate is too low, the antistatic agent is difficult to form a continuous hydrophilic conductive layer on the surface of the fiber, and has poor antistatic effect. The rolling rate is too high, it is not easy to dry after finishing, and the stereotyped effect is not good, and the antistatic hydrophobic group is not fused with the fibers, which easily leads to the accumulation of charge, thereby reducing or affecting the antistatic effect.

In addition, when the setting temperature is too low and the time is too short, the fabric electrode can not be fully fused with polyester fiber, so it is difficult to form a good hydrophilic conductive layer, and can not achieve good antistatic effect. Otherwise, it will easily cause the heat loss of the substrate and cause deterioration of other properties and waste of energy.

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