Rheology, the flow and deformation properties of a coating, including viscosity, thixotropy, yield value, and flow curve. It is known that when stirring or shaking the paint, the viscosity is lowered, but after the stirring is stopped, the viscosity is increased again after standing for a while. This property of paint is called "thixotropy", which is the main content of rheology.
The thixotropy of the coating can be determined using a rotational viscosity roughness meter. The structure is generally two concentric cylinders of the leveling device, the gap between the cylinders is small, and one of the two cylinders is rotatable. It can be driven by a motor, the speed can be adjusted, and the inner cylinder rotates at a given lower speed (6 to 120 revolutions per minute), so that the flow conditions of the liquid conform to simple movement. The torque caused by the inner cylinder in the outer cylinder is measured and converted into a value of absolute viscosity.
When measuring thixotropy, an appropriate rotor can be selected depending on the viscosity range of the coating. First, start at low speed, gradually increase the speed, and the color wheel reads each reading; then gradually decrement the speed and then measure the electronic balance once, also record each reading, multiply each reading by a specific coefficient in the coefficient table to obtain the absolute viscosity ( Centipoise). After drawing, a circular curve is obtained, which indicates the thixotropy of the coating to be tested and its size.
For more information on the paint viscometer, please visit: http://DIN cup ozhanduji
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