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What should be noted when using anti-static powder coating
source：www.cnjindu.com | Release time：2026年08月08日Divided into two categories: conductive (low resistance) and anti-static (dissipative), commonly used in explosion-proof, chemical, electronic equipment rooms, coal mines, and pharmaceutical equipment.
1、 Storage precautions
The warehouse should be cool and dry, with a temperature of ≤ 25 ℃, to avoid moisture; Moisture can cause pinholes and resistance fluctuations.
It is strictly prohibited to mix with ordinary insulation powder. Once mixed with ordinary insulation powder, the conductive filler is diluted, the surface resistance directly increases, and the anti-static ability is lost; Different grades of anti-static powders are also prohibited from being mixed randomly.
Use up as soon as possible after opening; Powder should avoid heavy pressure and clumping. After clumping and sieving, the surface resistance should be retested and not directly online.
Recycled powder should be stored separately without cross contamination with other powders.
2、 Pre treatment of workpieces (affecting resistance and adhesion)
Substrate: Carbon steel, stainless steel, aluminum can all be used; Pre treatment involves strict degreasing, phosphating/passivation, and removal of oil, salt, and dust. Oil stains can block conductive pathways and reduce adhesion.
Workpieces and fixtures must be conductive. The old coating on the hanger should be polished and cleaned thoroughly. The insulation of the hanger can cause poor grounding of the workpiece, uneven powder coating, and abnormal local resistance.
Do not apply insulation primer on the surface of the workpiece; If the primer is an insulating powder, it will directly block the conductive path between the substrate and the anti-static coating, causing the anti-static effect to fail.
Antistatic powder relies on conductive fillers inside the coating to form a continuous conductive network, without the need for insulation between the substrate and the coating.
3、 Spray environment and equipment
The compressed air in the spray booth must be degreased and dehydrated; Oil and water entering the coating can cause pinholes and local resistance abnormalities.
Spray booth, hanger, and workpiece are reliably grounded.
Attention: Anti static powder itself has certain conductivity, and the powder spraying system should be properly grounded to prevent charge accumulation; Compared to ordinary powders, the Faraday cage effect is more likely to occur.
Electrostatic spraying parameters: voltage should not be too high, generally 60-75kV; distance 15-22cm. High voltage can easily cause breakdown and pinholes; Reduce the voltage appropriately for workpieces with deep grooves.
Control of Recycled Powder (Key)
Repeated recycling can cause a deviation in the proportion of conductive fillers and fluctuations in resistance; It is recommended that the proportion of new fans be ≥ 60-70%.
After each batch of recycling, sample and measure the surface resistance. If it is not qualified, it is prohibited to use it.
It is not recommended to use 100% recycled powder for production.
4、 The influence of coating thickness on anti-static performance (very critical)
The surface resistance of anti-static powder is sensitive to film thickness and cannot be adjusted arbitrarily like ordinary powder
Strictly follow the manufacturer's recommended film thickness, typically 80-150 μ m.
Thin film thickness: discontinuous conductive network, high resistance, anti-static failure;
Excessive film thickness: The conductive filler is excessively wrapped by resin, causing an increase in resistance and also exceeding the standard; At the same time, the internal stress increases and the adhesion deteriorates.
Ensure that the thickness of the corners and grooves meets the standard, as these areas are prone to thinning and the resistance is not up to standard.
Within the same batch, if the film thickness fluctuates greatly, the finished resistance will be uneven.
5、 Curing baking
Solidify according to the parameters given by the powder manufacturer and measure the actual metal temperature of the workpiece, not the furnace temperature.
Insufficient curing: incomplete cross-linking of the resin, poor adhesion, damage to the conductive filler network, and increased resistance;
Excessive baking: Some carbon black systems have anti-static powders, and high-temperature baking can cause resistance drift.
It is recommended to increase the temperature gradient of thick coated workpieces to reduce bubbles and pinholes.
The surface resistance test must be conducted after cooling to room temperature, and the resistance measurement results at high temperatures are invalid.
6、 Finished product testing and usage environment
You can't just look at the appearance! Whether the appearance is complete or not does not mean that the anti-static is qualified. Each batch must be sampled for surface resistance (surface resistance tester).
Distinguishing resin systems:
Epoxy anti-static powder: suitable for indoor use, with good anti-corrosion properties, and cannot be exposed to direct sunlight outdoors; Mostly used for chemical equipment, mining equipment, and computer rooms.
Polyester anti-static powder: can be used outdoors and weather resistant.
It is strictly prohibited to spray clear varnish or insulating varnish on the finished coating; Once covered with insulating varnish, the conductive path is directly blocked, and the anti-static function is completely lost.
Avoid bumps and scratches, which can damage the conductive network of the coating and cause local loss of anti-static properties; Avoid long-term adhesion of oil stains to the surface, as the oil film will change the surface measurement resistance.
7、 Safe operation
Although it is an anti-static powder, it still belongs to combustible dust. The spray room should be kept explosion-proof and the dust removal system should work normally.
Wear dust-proof protective equipment for conductive fillers (such as carbon black) dust.
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Changshu Jindu Plastic Industry Co., Ltd
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