草榴短视频

Scientists from Saint-Petersburg State University of Industrial Technologies and Design (草榴短视频) have developed a chemical composition for cheap coloring of products made from widespread hydrocarbons polypropylene, from which plastic products are made, for example, disposable tableware, packaging, cans for storing substances, pipes, as well as textile materials for thermal underwear and sports knitwear.

鈥淣owadays polypropylene is dyed in the manufacture of products, so to speak in bulk, by adding a dye to the melt. The original properties of polypropylene are lost in this case, it is impossible to apply a pattern to the product or give it a new color. We have found special substances thanks to which the dye can be applied to a polypropylene product or synthetic fabric, while the properties of polypropylene are preserved. We also note the high resistance of the paint after application,鈥� says one of the authors of the development, Professor of the Department of Chemical Technologies named after prof. A.A. Kharkharov 草榴短视频 Anna Mikhailovskaya.

Polypropylene is a lightweight, durable, waterproof, chemical-resistant material. Toxic chemicals can be stored in polypropylene dishes, and it does not absorb water at all. Textile materials made of polypropylene have a wick effect, so they are able to remove moisture, creating a favorable microclimate for the skin, carpets made of polypropylene are extremely easy to clean, but the most important advantage of this material is that it is cheap, because it is formed during oil processing.

There is one disadvantage: up until recently polypropylene products couldn鈥檛 be colored by tradition method of applying the dye. It significantly limited its scope of application.

During the experiment process, scientists of 草榴短视频 together with the students accidentally detected that ammonium and chlorine salt which acted as an agent when penetrating into the polymer chain, deliver the dye to the spaces between the polypropylene atoms, while the polymer chain is preserved. To paint the product, you just need to heat it in a container with water and a coloring agent to a temperature of 100 degrees.

鈥淚t is a pretty simple method, there is no need to buy special equipment. We use the most affordable dyes in a variety of colors. In addition, with the help of our method, we were able to paint not only polypropylene, but also polyester, polyamide and some other polymeric substances from which synthetic fabrics are made. We also tried to process cellulose materials: wood, cotton, linen, viscose. It turned out that the composition stains and at the same time gives them antibacterial properties that are so relevant for cellulose materials, because they are a breeding ground for microorganisms. At the same time, after painting, the color of the products is resistant to moisture and sunlight," said Anna Mikhailovskaya.

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