1. Vacuum stirring defoamerCheck before starting the equipment
Power and component inspection: Confirm that the equipment power connection is stable, check whether key components such as vacuum pump, mixing device, heating system (if any) are intact, and ensure that there is no looseness or damage.
Cleaning and sealing verification: Clean the interior of the vacuum chamber and mixing drum to ensure that there are no residual impurities; Check whether the sealing ring, valve and other parts are intact to prevent air leakage from affecting the defoaming effect.
2. Material preparation and container selection
Material pretreatment: Weigh and mix the materials according to their characteristics (such as epoxy resin, silicone gel, electronic paste, etc.) in proportion to avoid defoaming failure caused by mixing errors.
Container adaptation: Choose containers that are resistant to vacuum and corrosion, ensuring that their capacity does not exceed 80% of the equipment specifications to prevent overflow during the mixing process; The container material needs to be compatible with the material (such as avoiding the reaction between metal containers and acidic materials).
3. Parameter setting and mode selection
Vacuum degree setting: Adjust the vacuum degree according to the viscosity of the material (usually -0.08~-0.095MPa). High viscosity materials require a higher vacuum degree to accelerate bubble expansion.
Mixing parameter setting:
Low viscosity materials (such as thin glue): orbital speed of 300-600rpm, rotational speed of 150-300rpm.
High viscosity materials (such as electronic pastes): orbital speed of 800-1400rpm, rotational speed of 400-2000rpm.
Mode selection: Automatic mode is suitable for standardized processes (preset speed, time, vacuum degree); Manual mode allows for flexible adjustment of parameters and is suitable for experimental operations.
4. Material loading and container sealing
Uniform loading: Slowly pour the mixed materials into the mixing bucket to avoid the formation of initial bubbles; Ensure that the surface of the material is smooth and free from unevenness.
Sealing operation: Place the container on the vacuum chamber workbench, tightly close the sealing cover, and check if the sealing ring is properly attached to prevent air leakage.
5. Vacuum pump start-up and pumping
Gradual pumping: Start the vacuum pump, observe the vacuum gauge reading, and ensure that the pressure gradually drops to the set value; Avoid rapid pumping that may cause severe rolling or spillage of materials.
Bubble monitoring: Check the escape of bubbles on the surface of the material through the observation window. If there are too many bubbles, adjust the vacuum degree or stirring speed.
6. Start up of mixing device and collaborative defoaming
Synchronization of revolution and rotation: Start the stirring device, the revolution generates centrifugal force to push the bubbles towards the surface, and the rotation forms shear force to break the large bubbles into microbubbles, accelerating the defoaming process with a dual effect.
Temperature control (if any): If the equipment is equipped with a heating system, set the temperature according to the material characteristics (such as controlling the temperature between 25-40 ℃ for silicone defoaming). Heating can reduce the viscosity of the material and promote the release of bubbles.
7. Monitoring and parameter adjustment of defoaming process
Real time observation: closely monitor the vacuum gauge, tachometer, and material status to ensure parameter stability; If the bubbles are discharged slowly, the vacuum degree or stirring speed can be appropriately increased.
Exception handling: In case of material overflow, equipment abnormal noise, or vacuum degree decrease, immediately suspend operation, check sealing, stirring blade position, or vacuum pump status.
8. Determination and shutdown of defoaming completion
Time or threshold control: Determine the completion of defoaming based on preset time (such as 5-10 minutes) or bubble content threshold (such as no visible bubbles).
Sequential shutdown: First turn off the mixing device, then stop the vacuum pump to avoid negative pressure caused by the sudden stop of the mixing blade, which may lead to material backflow.
9. Vacuum release and material extraction
Slow pressure relief: Open the vent valve and slowly release the vacuum chamber pressure to atmospheric pressure to prevent material splashing due to sudden pressure changes.
Safe removal: Wear protective gloves, carefully open the sealing cover, and remove the material after defoaming; Check whether the surface of the material is uniform, free of bubbles, and meets the quality requirements.
10. Vacuum stirring defoamerEquipment cleaning and maintenance
Residual cleaning: Wipe the vacuum chamber, mixing tank, and sealing ring with a dust-free cloth to avoid material solidification and blockage of the equipment.
Component inspection: Regularly check the oil level of the vacuum pump, the wear of the stirring blade, and the elasticity of the sealing ring, and replace aging components in a timely manner.
Data recording: Record the operating parameters (vacuum degree, stirring speed, time, etc.) and defoaming effect of this operation, providing reference for subsequent process optimization.