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Application of carbon black in waterborne paint and reinforcement in rubber

2020-09-23 18:34:37
carbon black Can it be dissolved directly in water? Generally, it is insoluble in water, and it is usually necessary to add specific additives to achieve the effect of carbon black dissolving in water after specific treatment. We call this kind of carbon black water-soluble carbon black. In water, the special carbon black pigment which can be dissolved in water is the biggest.
  
The main raw material of black water-borne paint is carbon black. The basic principle is that the blackness should be good enough, and the structure should not be too low, otherwise it will affect the dispersion, and the content of oxygen-containing groups should be rich enough.
  
Water based paint has been widely used in many fields such as interior wall decoration, wood furniture and so on. Water as a solvent or as a dispersion medium of coatings, can be called water-based paint. Water based paints include water soluble, water diluted and water dispersed. In the past decade, under the increasingly strict environmental protection law, waterborne wood coatings have been increasing by 19% annually in Europe. The market share of water paint in the world is expanding year by year. Germany is 70%, the United States is 80%, and the annual growth rate is about 9%. However, the domestic water-based paint is still in its infancy, and it will have broad application prospects. In the next five years or so, water-based wood coatings will be popularized.
  
When making black water-based paint, the performance of pigment carbon black should be stable to ensure the quality. The dispersion of carbon black is particularly important in the production of waterborne paint, which has a certain impact on the blackness, brightness and fluidity of waterborne paint. The smaller the aggregate, the better the dispersion in the paint, the higher the gloss. Powder products without granulation treatment are often used in water-borne paint. Such products usually go through post-treatment to increase the content of chemical adsorbed oxygen groups on the surface of particles. With the increase of these oxygen-containing groups, it will give them better performance. Not only can the blackness of carbon black be greatly improved, but also the higher the level of these groups, the better the flow will be Mobility.
 
Now many rubber products are mostly made of carbon black. Therefore, rubber and carbon black form a solid bond that can be obtained by sliding, and this bond also produces a second reinforcement effect. So, why can carbon black play a reinforcing role in rubber?
 
The first reinforcement effect is that when the rubber is deformed by external force, the slip of molecular chain and a large number of physical adsorption can absorb the impact of external force and buffer the friction or hysteresis deformation caused by external force; the second effect is to make the stress distribution uniform. As a result of these two effects, the rubber strength is increased. The basic principle of carbon black reinforcement is to resist tearing without damaging the elasticity of rubber too much (i.e. the movement of molecular chains).
 
There are many reinforcing fillers in rubber industry, such as clay, heavy calcium carbonate, precipitated silica and fumed silica. Among them, silica and carbon black have the best reinforcing properties. As for why silica and carbon black have good reinforcing properties, it is mainly because rubber is an organic substance, mainly composed of C atom and H atom, while C in carbon black and Si in silica are in yuan In the periodic table, they all belong to the same column. There are four electrons outside their nuclei. That is to say, they may participate in the chemical reactions in the rubber mixing and vulcanization process, and form bonds with rubber molecules, so as to enhance the binding force between rubber molecules and achieve the reinforcement effect.
 
Why carbon black can be reinforced: when carbon black is added in the production of rubber, it will cross-linked, form a spatial network structure, and then wrap carbon black, carbon black The structure adsorption layer and rubber macromolecules adsorbed on the surface of filler ions such as carbon black, resulting in the reinforcement effect with sliding effect.
 Application of black in water based paint
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