The product is a liquid, add it directly to the material under the temperature of 80℃ and stir it well.
1, The dosage of common daily cosmetic is 0.2-0.3‰
2, The dosage of cosmetics is 0.3-0.5‰
3, The dosage of detergent products is 0.5-1.0‰
If you need sterilization and antibacterial effect at the same time, the dosage will be increased or decreased according to the above dosage after doubling the small test.
Coating light aging behavior
Coating light aging evaluation
There are many ways to characterize the photo-aging properties of coatings. For polymers without carbonyl structure, their photo-aging behavior can be characterized by changes in the carbonyl signal of infrared absorption spectroscopy. Many types of coatings, including photocurable coating formulations, sasol chemicals wax contain ester carbonyl and ammonia. Ester bond, etc., is not suitable to use carbonyl value to characterize its photoaging behavior. At this time, the yellowing index (YI) can be used for characterization, and the international standard method follows ASTM D1925. Generally, the cured film is placed in an ultraviolet light environment to receive ultraviolet radiation. After a period of exposure, the light transmittance of the cured film at several specific wavelengths is measured with an ultraviolet-visible spectrophotometer. The radiation source can be Pyrex A medium-pressure mercury lamp that filters short-wave ultraviolet light below 320nm. The yellowness index is defined as:
In the formula, T420um and T’420mm are respectively at 420nm before and after photoaging of the cured film
The light transmittance, %;
T680mm and T’680mm are the cured film at 680nm before and after photoaging.
T580nm-the light transmittance of the cured film at 580nm before photoaging.
The aging test using artificial light sources is called accelerated aging, and it is often equipped with additional devices such as humidity, temperature, salt spray, etc., to comprehensively evaluate the anti-aging performance of the coating more objectively. In addition to the ultraviolet light source, the more commonly used aging light source is a xenon lamp with a power of several hundred watts. Its spectral output is a continuous spectrum starting from 250nm, which is similar to the distribution of the positive band reaching the ground. It is often used as a light source for artificial aging machines. Other artificial aging light sources include Q UVA and Q UVB. Q UVA belongs to long-wave ultraviolet output. The output wavelength of Q UVB ranges from 280 to 360 nm, with the center at 310 nm. In most documents, unless otherwise specified, Q UV refers to Q UVA. Figure 14-1 shows the output wavelength distribution of these types of light sources.
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