1. Please put on rubber gloves when using this product, wash your hands with soapy water after operation, and do not touch other parts, especially eyes, before cleaning, to prevent allergy in some allergy-prone people.
2. When using the product, please match it first to see if there is any insoluble or discoloration problem.
3. accidentally splashed in the eyes or on the skin when using, immediately wash with soapy water, allergic people can use Laohuzi ointment to rub the allergic place.
4. When using must be oil anti-mildew antibacterial agent and oily liquid substances fully mixed, but should not be violently stirred to avoid spilling.
For pseudoplastic bodies: ①The shear stress versus shear rate is plotted as a curve passing through the origin [Figure 5-3(a)]; ②The viscosity decreases as the shear rate increases [Figure 5-3(b)].
At the same time, the opposite phenomenon occurred. As the shear rate increased, the viscosity also increased. Figure 5-4 shows the “dilatant flow” or “shear thickening”, however, this is a relative change. Examples are solid dispersions, such as sand or unstable pigment pastes, because the particles have a hydrophobic surface, such as calcium and magnesium soap dispersions. These sticky particles collide with each other and increase friction. In addition, because the polymer molecules are partially dissolved, a strong montan wax cas no internal affinity is generated in the molecular chain. After the mechanical energy is applied, it is extended, resulting in a higher flow resistance.
For dilatant liquids: ①The shear stress versus shear rate is plotted as a curve passing through the origin, [Figure 5-4(a)]; ②The viscosity increases with the increase of the shear rate [Figure 5-4(b) ].
Another very important characteristic of coatings is thixotropy. It is a pseudoplastic phenomenon related to time and shear history. As the shear time is increased at a given shear rate, the viscosity becomes lower. When increasing the shear rate, the rheological curve is recorded on the rheometer, and returning to the low shear rate, the second curve will be lower than the previous one. The area between the two curves is called the hysteresis zone, which also represents the thixotropy of the material, as shown in Figure 5-5. In addition, the test conditions will also affect the results of the thixotropy test. After leveling, the paint stays still and returns to its original viscosity.
In some cases, the fluid does not flow until the shear stress exceeds a certain minimum value. This minimum shear stress is called the “yield value”.
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