UV Absorber UV-327: Introduction to UV Absorbers

2023-08-31

UV absorbers, as absorbers, are currently the most widely used type of light stabilizers in China. According to their structural design, they can be divided into the use of salicylic acid and its esters, benzophenones, benzotriazoles, and substitution for the production of triazines. The most widely studied industrial applications are benzophenones and benzotriazoles. Quenching agents mainly form complexes with metals, such as divalent nickel complexes, which can be used in conjunction with ultraviolet absorbers to achieve synergistic development.

Seven main antioxidants

2023-08-31

1. Antioxidant DLTP: White crystalline powder, melting point around 40 ℃, low toxicity, insoluble in water, soluble in benzene, carbon tetrachloride, and acetone. Used as an auxiliary antioxidant for polyethylene, polypropylene, ABS, and polyvinyl chloride resins, it can change the heat resistance and oxygen resistance of products. The general dosage is 0.05%~1.5%

Polyethylene glycol standard

2023-08-31

Determination of molecular weight and polydispersity of macromolecular polymers by gel permeation chromatography (GPC) has been widely used in various industries due to its advantages of simple operation, economy and speed. For this method, when determining the sample to be tested, it is necessary to select a standard sample to make the standard curve. Therefore, for accurate determination of the molecular weight of polymer, the correct selection of the standard sample is particularly important.

Misunderstanding of preservatives

2023-08-31

In response to the problems in the use of food preservatives and people's misconceptions about preservatives, the China Consumer Association solemnly reminded consumers in the second consumer warning in 2001: to have a correct understanding and rational view of preservatives in food, and to master common knowledge about food preservatives, so that they can make clear choices when purchasing food; Children, pregnant women, and other special populations belonging to a special period of physical development should be given special protection in terms of food intake. It is recommended not to give them food that uses too much preservatives to ensure their physical health; When choosing food and beverages, try to purchase products with credibility and quality that can withstand market tests, as the use of preservatives in these products is more cautious and reliable, and the labeling is often more authentic; Do not easily believe the claims made by some small and medium-sized enterprises in product descriptions or advertisements that "this product absolutely does not contain any preservatives". Some essential preservatives in food are also developing towards safety, nutrition, and pollution-free directions. New types of preservatives such as glucose oxidase, protamine, lysozyme, lactic acid bacteria, chitosan, and pectin decomposition products have emerged and have been approved for use by the state. It is recommended that everyone try to * * * foods containing natural preservatives to ensure that your health is not damaged.