Gloss Affecting Factors of Acrylic Paints
1. What is the gloss of acrylic paint?
The gloss of acrylic paint is the ability to reflect light on its surface. The gloss performance of different paints is generally different. Gloss is a characteristic of the object surface, which depends on the specular reflection ability of the surface to light. Glossiness is the ability to measure the specular reflection of the material surface under a set of geometric conditions. The so-called specular reflection refers to the reflection angle equal to the angle of incidence. Most acrylic paints are neither completely mirrored nor completely matte, but somewhere in between.
Gloss measuring instrument is to measure the reflectivity of the object surface, which is called the specular gloss measuring instrument. To measure the glossiness of acrylic paint surface, we can use Linshang gloss measuring instrument-paint gloss tester LS192. After booting through self-calibration, place the measuring port on the surface of the measured object, the measured value will be displayed. LS192 gloss tester can automatically calculate the maximum value, minimum value, average value and standard deviation value of paint. The smaller the standard deviation, the more uniform of the product gloss. Here we need to pay attention to the different angle of incidence selected during the measurement and the measured results are also different.
2. Factors affecting the gloss of acrylic paint
(1) The pigment particle size and dispersion in the base material affect the gloss of the paint film. First, the finer the pigment, the better the dispersion uniformity. The more favorable it is to form a smooth paint film. The second is that the pigment particles in the paint film weaken the specular reflection and cause the gloss to decrease. The gloss gradually decreases as the volume concentration of the pigment increases.
(2) The degree of light absorption and reflection of different colors of pigments are different. Black paint completely absorbs light and white paint completely reflects light, black paint shows higher gloss than white paint.
(3) The type of solvent used in the paint directly affects the speed of its volatilization rate. Too fast or too slow will affect the smoothness of the paint film and reduce the gloss of the paint film.
(4) The gloss of the paint film surface not only depends on the smoothness and roughness, but also the light incident angle will affect the gloss. The greater the angle of incidence, the higher the intensity of the reflected light.
(5) In the medium-gloss area, the visual gloss is approximately linear with the instrument's measured gloss; in the high-gloss area, due to the sharpness of the reflected image, the visual gloss is often lower than the measured gloss; in the low-gloss area, due to the pigment (matting agent ), the added amount and the roughness of the paint film surface will make the visual gloss higher than the actual measurement result of the instrument.
(6) The standard board is the main benchmark for measuring and calculating the gloss of the paint film, which will directly affect the accuracy of the gloss determination of the sample, so it should be carefully preserved to prevent surface damage.
The above is the main content of the influence factor of the acrylic paint gloss. As mentioned above, we can use the gloss tester LS192 to easily detect the specific gloss of acrylic paints so as to facilitate the control of the gloss quality of acrylic paints.