Light fastness (weather) index should pay attention to when plastic color matching
Date：2022-03-15
(1) The light resistance (weather) property is related to the amount of colorant. As the amount of colorant increases, the light resistance (weather) will increase. The volume of the colorant will increase and the amount of pigment on the surface layer will increase. Under the same degree of light irradiation, Its light resistance is better than the amount of colorant. When the pigment volume concentration increases to a critical value, the enhancement of lightfastness also reaches its limit.
(2) Light fastness (weather) and light time are related. Light fastness (weather) has a strong dependence on light time. The decay of most quotients is linear, once exposed to sunlight. change continuously. Generally speaking: plastic coloring products can reach 3 or more after 2000 hours of weather resistance, and can be used outdoors.
(3) The light fastness (weather) is related to the addition of titanium dioxide. Generally speaking, after adding titanium dioxide, the light fastness (weather) of the pigment decreases to a certain extent, and the more it is added, the more it decreases.
(4) The light resistance (weather) is related to the resin. The color change of some polymers is intensified under light irradiation, which affects the color change of the product. Adding UV stabilizer is a feasible method to reduce the color change of the product.
The chemical properties of polymer monomers, polymerization methods, and the antioxidants and light stabilizers used are different, and the light resistance (weather) properties of pigments in different types of plastics are different.
(5) Differences between light fastness (weather) performance technical indicators and actual use The method of measuring light fastness (weather) under conditions. The basis of any accelerated test is to adequately simulate different gas conditions with an experimental setup, and also to take into account the correlation between the two test principles.
On the one hand, it is because the needs of customers are not always fully satisfied; on the other hand, the technical indicators of light resistance (weather) will deviate between theory and practice. However, the change of color and the time of exposure are not always linear. Sometimes the change of color is only when exposed to the sun, and the change of color stops after a period of time. Sometimes it is just the opposite. At first, there is no change in exposure, but after some time, the color change begins.
(2) Light fastness (weather) and light time are related. Light fastness (weather) has a strong dependence on light time. The decay of most quotients is linear, once exposed to sunlight. change continuously. Generally speaking: plastic coloring products can reach 3 or more after 2000 hours of weather resistance, and can be used outdoors.
(3) The light fastness (weather) is related to the addition of titanium dioxide. Generally speaking, after adding titanium dioxide, the light fastness (weather) of the pigment decreases to a certain extent, and the more it is added, the more it decreases.
(4) The light resistance (weather) is related to the resin. The color change of some polymers is intensified under light irradiation, which affects the color change of the product. Adding UV stabilizer is a feasible method to reduce the color change of the product.
The chemical properties of polymer monomers, polymerization methods, and the antioxidants and light stabilizers used are different, and the light resistance (weather) properties of pigments in different types of plastics are different.
(5) Differences between light fastness (weather) performance technical indicators and actual use The method of measuring light fastness (weather) under conditions. The basis of any accelerated test is to adequately simulate different gas conditions with an experimental setup, and also to take into account the correlation between the two test principles.
On the one hand, it is because the needs of customers are not always fully satisfied; on the other hand, the technical indicators of light resistance (weather) will deviate between theory and practice. However, the change of color and the time of exposure are not always linear. Sometimes the change of color is only when exposed to the sun, and the change of color stops after a period of time. Sometimes it is just the opposite. At first, there is no change in exposure, but after some time, the color change begins.