The aging resistance and color fastness test of PVC film is an important part of evaluating its performance and service life . The following is a detailed description of the two test methods:
First, PVC film aging resistance test
As a commonly used plastic film material, PVC film is widely used in construction, packaging and electronics industries. However, long-term exposure to ultraviolet light or harsh environments may cause aging and degradation of PVC film, which affects its performance and service life. Therefore, the aging resistance test is very important.
Aging resistance test usually includes natural climate exposure test and artificial accelerated aging test. Natural climate exposure test is to directly expose the PVC film sample to the natural environment, and observe the changes in its appearance and properties, such as color change, degree of embrittlement, tensile strength, etc. . This method can truly reflect the aging of PVC film in the natural environment, but the test cycle is longer.
In order to shorten the test period, artificial accelerated aging test is widely used. Among them, xenon lamp aging test and fluorescent ultraviolet lamp aging test are two common methods. Xenon lamp aging test can accelerate the aging process of PVC film by simulating ultraviolet, visible and infrared spectra in sunlight, and set specific irradiation intensity, temperature, humidity and test time to compare the performance of the film before and after aging . The aging test of fluorescent ultraviolet lamp mainly simulates the aging effect of ultraviolet on PVC film, and monitors the aging of the film by controlling the wavelength and irradiation amount of the lamp .
Two, PVC film color fastness test
Color fastness refers to the ability of PVC film to maintain its original color when subjected to external factors (such as light, heat, friction, etc.). For color PVC film, the color fastness test is particularly important.
Color fastness test usually includes light fastness test, friction fastness test and so on. The color fastness test to light can be observed and recorded by exposing PVC film to a light source of specific intensity (such as an ultraviolet lamp). The color fastness test to friction is to evaluate the color retention ability of PVC film under friction by simulating the friction situation in actual use.
In the color fastness test, the color difference meter can be used to measure the color difference of PVC film before and after aging to determine its appearance change. The degree of color difference can be quantified by comparing the changes in L*, a*, and b* values.
In summary, the aging resistance and color fastness test of PVC film is an important link to ensure its performance and service life. Through scientific testing methods, the durability and color retention ability of PVC film can be evaluated in different environments, providing strong support for product quality control and application.——Pvc film buy in china.