Usage method of non silicone leveling agent for unstable polyurethane varnish foam
1、 Formula preparation
Choose leveling agent:
Select the appropriate non silicone leveling agent based on the type, viscosity, curing conditions, and desired leveling effect of polyurethane varnish.
Determine the amount to be added:
Generally speaking, the amount of leveling agent added will be adjusted according to the formula of polyurethane varnish and the required leveling effect. The recommended addition amount is usually between 0.1% and 5%, depending on the product description and experimental data.
2、 Mixed process
Pre mixed:
Before adding leveling agent to polyurethane varnish, it can be pre mixed with a small amount of solvent (such as acetone, ethanol, etc.) or the base resin of polyurethane varnish to ensure that the leveling agent can be uniformly dispersed.
Gradually add:
Gradually add the pre mixed leveling agent to the polyurethane varnish while stirring continuously to ensure that the leveling agent can be evenly dispersed in the polyurethane varnish.
Mixing time:
The mixing time should be long enough to ensure that the leveling agent is fully mixed with the polyurethane varnish. It is generally recommended to use a high-speed mixer for stirring, and the stirring time is usually between 10 and 30 minutes.
3、 Coating process
Construction environment:
Before coating, it is necessary to ensure that the temperature, humidity, and other conditions of the construction environment meet the construction requirements of polyurethane varnish.
Coating method:
Spraying, brushing, roller coating and other methods can be used for coating. The specific choice of coating method depends on the shape, size, and desired coating effect of the product.
Control the coating amount:
The coating amount should be adjusted according to the required coating thickness and leveling effect. Excessive coating amount may cause the coating to be too thick and dry slowly, while insufficient coating amount may not achieve the desired leveling effect.
Drying and curing:
After coating, it should be dried and cured according to the curing conditions of polyurethane varnish. The curing temperature and time should be adjusted according to the specific product to ensure that the coating can be fully cured and achieve the required performance.
4、 Precautions
Avoid pollution:
When using leveling agents, they should be avoided from mixing with other chemicals to prevent chemical reactions that may cause performance degradation.
Storage conditions:
Leveling agents should be stored in a cool, dry, well ventilated place, away from direct sunlight and high temperatures.
Safe operation:
When using leveling agents, appropriate protective equipment such as gloves, masks, etc. should be worn to avoid irritation or injury to the skin and respiratory tract.
Experimental verification:
Before formal use, it is recommended to conduct small-scale experimental verification to determine the optimal addition amount and coating process parameters.
In summary, the use of non silicone leveling agents for unstable polyurethane varnish involves multiple aspects such as formulation preparation, mixing process, coating process, and precautions. By using it correctly, the leveling agent can be fully utilized to improve the leveling performance and coating quality of polyurethane varnish.
