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Terminology for the physical properties of UV coatings and coating films
Release time:
2024-04-12
Is the mass per unit volume of the substance at the specified temperature. commonly used units are kilograms per cubic meter and grams per cubic centimeter.
1. The ability of transparent
substances to transmit light. Transparency indicates whether varnishes, lacquers and thinners contain mechanical impurities and turbidity.
2. The color
of the transparent liquidThe degree of color of the transparent liquid (varnish, clear oil, paint and thinner).
3. The density
is the mass per unit volume of the substance at the specified temperature.
Commonly used units are kilograms per cubic meter and grams per cubic centimeter.
4. The internal resistance of viscous
liquids to flow.
5. The ratio of the shear stress exerted by the dynamic viscosity
to the velocity gradient of the liquid.
Note:
(1) The SI unit of dynamic viscosity is Pascal seconds (Pa?s), and the customary unit is centipoise (cP), 1cP=1mPa?s.
(2) It can be determined by a rotational viscometer.
6. The ratio of kinematic viscosity to
dynamic viscosity to liquid density. The SI unit is square meters per second (m2/s) and the customary unit is centiscus (cSt), where 1 cSt = 1 mm2/s
7. The outflow time
is in the outflow cup filled with the tested liquid, and the time elapsed from the beginning of the outflow of the test liquid to the first interruption of the flow beam near the hole is generally expressed in seconds.
8. The number of milligrams of potassium hydroxide (KOH) required for acid value
neutralization of free acid in 1g of non-volatile products of the product.
9. The hydroxyl value
is equivalent to the number of potassium hydroxide (KOH) milligrams of hydroxyl (equivalent number) in 1g of non-volatile substances of the product.
10. Storage stabilityUnder
the specified conditions, the degree to which UV coating products resist the performance changes such as peculiar smell, consistency, crusting, coarseness, bottom sinking, agglomeration, and increased acid value that may occur after storage.
11. The wet paint film after leveling
can flow and eliminate the coating marks, and the degree of uniform flat paint film can be obtained after drying.
12. An optical property of a glossy
surface, expressed by its ability to reflect light.
Note: The gloss of the paint film can be divided into light, semi-light and matte. Gloss is often measured at a 60° angle.
13. The firmness of the bond between the adhesive
paint film and the coated surface (through physical and chemical action). The surface to be coated can be either a bare substrate or a painted substrate.
14. The ability of the hardness
paint film to resist mechanical forces such as collision, depression, scratching, etc.
15. The ability of flexible
paint film to deform with its substrate without damage.
16. The ability of the impact-resistant
paint film to deform rapidly under the impact of a heavy hammer without cracking or falling off from the metal substrate.
17. The resistance of wear-resistant
paint film to friction.
18. The resistance of the water-resistant
(gasoline) paint film to the action of water (gasoline). That is, under the specified conditions, the painted test board is soaked in water (gasoline) to observe whether it has whitening, discoloration, blistering, falling off and other phenomena, as well as the difficulty of restoring the original state.
19. The resistance of acid (alkali, salt water, solvent)
resistant paint film to acid (alkali, salt water, organic solvent) erosion.
20. The resistance of salt spray resistant
paint film to salt spray erosion.
21. The resistance of damp heat resistant
paint film to high temperature and high humidity environment.
22. The ability of
weather-resistant paint film to resist the damaging effect of sun, rain, dew, wind, frost and other climatic conditions and maintain the original performance.
23. The performance changes of natural aging
paint film when exposed to outdoor natural conditions.
24. The performance change of artificial aging
paint film gradually occurs when it is exposed in the artificial aging testing machine.
25. Gloss-retaining (color) The ability of
the paint film to maintain its original gloss (color).
26. Yellowing and yellowing
of paint film in the process of aging tendency to yellow.
27. The ability of temperature-resistant denaturation
paint film to maintain its original properties by alternating temperature changes of cold and heat.
28. The breakdown voltage
is the voltage value of the paint film when it is broken down under the action of the voltage applied in the specified way.
29. The ratio of the breakdown voltage of the electrical (dielectric) strength
paint film to the average thickness of the paint film.
30. The dielectric loss tangent
represents a parameter of the energy loss of the paint film under the alternating current field, which is the cotangent of the phase angle between the applied sinusoidal voltage and the current passing through the sample.
31. The ratio of the DC electric field strength of
the volume resistivity in the direction of the volume current of the paint film to the current density there. Expressed in ohms.
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