The manufacturing method of pigments and fillers is an important technology in the field of chemical raw materials production. Color fillers are mainly used to improve the appearance quality and performance of products, and increase their added value. This article will introduce several common methods for manufacturing pigments and fillers
1、 Precipitation method is a common method for manufacturing pigments and fillers, which is based on chemical reactions to precipitate metal ions from the raw materials, forming pigment particles. The specific steps are as follows:
1 Mix salts containing metal ions with water to create a salt solution
2. Add a precipitant to allow metal ions to react with the precipitant to form precipitates
3. By controlling reaction conditions such as temperature, pH value, etc., the precipitate gradually grows to form pigment particles of a certain size
4. Wash, dry, and grind the pigment particles to obtain finished pigments and fillers
The advantages of precipitation method are simple process, low cost, and the ability to prepare various colors of pigments. However, the pigment particles prepared by this method have a larger particle size and insufficient color brightness, requiring grinding treatment
2、 Sol gel process
Sol gel process is a new method for manufacturing pigments and fillers. Its principle is to prepare nanometer pigment particles through the sol gel process. The specific steps are as follows:
1 Mix metal salts with water to create a uniform sol
2. Add organic solvent and catalyst to make the sol undergo hydrolysis and condensation reaction to form gel
3. The gel is transformed into pigment particles through post-treatment such as drying and roasting
The advantages of sol gel method are small particle size, uniform distribution and high color brightness. However, the preparation process of this method is relatively complex and the cost is high
3、 Microemulsion method
Microemulsion method is a method of preparing pigments and fillers by using micro lotion technology. Its principle is to prepare nanometer pigment particles by coalescence and growth of water droplets in micro lotion. The specific steps are as follows:
1 A micro lotion is prepared by mixing salts containing metal ions, surfactants and water
2. Adjust pH value, temperature and other factors to make water droplets in the micro lotion coalesce and grow to form pigment particles
3. Wash, dry, and grind the pigment particles to obtain finished pigments and fillers
The advantages of microemulsion method are that the pigment particles prepared are small in size and evenly distributed, and the process is simple and easy to operate. However, this method requires a large amount of surfactants and organic solvents, which can cause certain environmental pollution
4、 High temperature synthesis method is a method of preparing pigments and fillers through high-temperature reactions. Its principle is to cause chemical reactions in the raw materials under high-temperature conditions to generate pigment particles. The specific steps are as follows:
1 Mix the raw materials in a certain proportion and place them in a high-temperature furnace
Under high temperature conditions, the raw materials undergo chemical reactions to generate pigment particles
3. Obtain finished pigments and fillers through post-processing such as cooling and grinding
The advantages of high-temperature synthesis method are that the prepared pigment particles have small particle size, high color brightness, and high production efficiency. However, this method consumes a lot of energy and requires high equipment requirements
In summary, there are various manufacturing methods for pigments and fillers, and each method has its own advantages, disadvantages, and applicability. In actual production, appropriate manufacturing methods should be selected based on specific needs and conditions to ensure product quality and production efficiency.
