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Yuan Lei Small Classroom | Brief Introduction of Fillers for Common Coatings

Release time:

2024-01-29 09:35

 

Yuan Lei Small Classroom | Brief Introduction of Fillers for Common Coatings

 

General coatings are composed of film-forming substances, solvents, pigments, additives, and fillers. Filler is the largest component of the coating in addition to the film-forming material, so the choice of filler is very important for the performance of the coating.


01


in paintThe main role is the following aspects:

 


1. Improve the mechanical strength of paint and film;

2. Filling effect, improve the solid content, reduce the amount of resin and solvent, reduce the cost;

3. Give the coating good fluidity, construction performance, increase the thickness of the film;

4. Provide partial coverage, weather resistance, UV resistance, and prolong the service life of the coating film;

5. Special functionality, such as UV shielding, heat resistance, minimal toxicity;

6. Improve the performance of other additives, such as thickeners, rheological agents, antistatic agents, UV stabilizers, etc.


 

 

The fillers needed in coatings mainly include calcium carbonate, barite powder, quartz powder, talc, kaolin, mica powder, wollastonite, dolomite, etc. These fillers have different composition structure and chemical properties, but they all have common characteristics, which are necessary as coating fillers:

 


White or light color, whiteness requirements are generally above 90%;

2. Small particle size, narrow particle size distribution, easy to disperse, can cover the coating evenly;

3. It is necessary to have low oil absorption and low oil absorption value to improve the critical pigment volume concentration of the coating, save the resin substrate, and meet the requirements of modern high-solid coatings. The following figure shows the oil absorption value/(g/100g) of some non-metallic fillers;


 

 


4. Can make the coating has good rheological properties (fluidity, leveling, suspension, thickening, etc.), so that the coating does not precipitate during storage, which is convenient for construction and film formation, forming a smooth and smooth coating film;

5. Good compatibility with other components of the coating film and no chemical reaction with other components;

6. Appropriate specific surface area, particle shape and crystal morphology. It directly affects the viscosity, dispersion stability, refractive index and other properties of the coating.


 

Common, coatings, fillers, performance, improvement, role, composition, composition, dispersion, resin

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