Coal asphalt manufacturer Gao Xiao
The fluidity and viscosity of coal pitch are two interrelated performance indicators. Viscosity is a measure of the ability of a fluid to resist shear stress, and it represents the internal friction of a substance. In the case of coal pitch, the higher the viscosity, the less fluid it is, i.e. the more difficult it is to flow. In other words, a higher viscosity means that when the coal pitch is subjected to shear forces, the internal friction is greater and it is not easy to flow.
The fluidity and viscosity of coal pitch are negatively correlated, that is, the better the fluidity, the lower the viscosity, and conversely, the worse the fluidity, the higher the viscosity. In practical applications, it is necessary to select coal pitch with appropriate fluidity and viscosity according to specific needs to achieve good use results.
In road paving, it is necessary to choose coal pitch with good fluidity and moderate viscosity to ensure that it can evenly penetrate into the surface of the bonded object to form a uniform adhesive layer, resulting in uneven bonding, if the viscosity is too low, it is easier to produce a flow phenomenon, affecting the flatness and service life of the road surface.
If you want to improve the fluidity of coal pitch, how to reduce its viscosity?
The coal pitch is mixed with the solvent, and the concentration of the coal pitch is reduced through the volatilization of the solvent, and the viscosity and fluidity can also be adjusted, making the coal pitch easier to apply in different engineering projects. Commonly used solvents are petroleum ether, gasoline, etc. It should be noted that the amount and type of solvents and other chemical substances should be controlled, and the optimal ratio scheme should be found in the dilution process to achieve the purpose of adjustment.
By grinding, stirring, and heating the coal pitch, the temperature rises and the viscosity of the coal pitch is reduced. By heating the coal pitch to a certain temperature, it is the coal pitch that becomes more fluid. This method is suitable for coal pitch that requires higher viscosity and can improve flowability when used at low temperatures. It should be noted that excessive grinding may lead to excessive particle fineness and reverse increase viscosity, and the processing time and strength need to be controlled to maintain the properties of coal pitch.
When preparing the charging material, it is necessary to pay attention to its composition and properties to ensure that it has good fluidity and operability. For example, the right amount of diluent or plasticizer can be added to improve the flow of asphalt.
By adjusting the temperature, the viscosity and fluidity of coal pitch can be effectively controlled to meet different application needs.