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Waterproof and Moisture-Permeable Coating Agent and Its Application

The coating finishing of fabrics is an important branch of textile post-finishing technology. It not only imparts unique style, feel, and appearance to the fabric but also endows the fabric with various functions, significantly enhancing the added value of the product. The main Applications of coated products can be divided into three categories: first, clothing, shoes, and hats; second, industrial fabrics; and third, decorative fabrics. Among these, the clothing, shoes, and hats category has the largest usage. Currently, the development of coated products is rapid both domestically and internationally, with functional coating products such as waterproof and moisture-permeable coatings, UV-resistant coatings, thermal insulation coatings, flame-retardant coatings, light-blocking coatings, and conductive coatings emerging. Among them, waterproof and moisture-permeable coatings are undoubtedly one of the more challenging and technically demanding varieties of functional coating products, and they can be widely applied to military uniforms, sportswear, special occupational clothing, ordinary autumn and winter clothing, and fabrics for shoes.

2022

Does adding a certain amount of electrolyte (such as salt or sodium carbonate) to the detergent improve the washing effect?

Adding an electrolyte with an opposite charge to the anionic surfactant can generally improve surface activity and reduce the critical micelle concentration (CMC). This is because increasing the concentration of counterions for ionic surfactants affects the diffusion double layer of the surfactant micelles, reducing the repulsive forces between surfactant ions, which in turn decreases the thickness of the double layer, making it easier for micelles to form, thus lowering surface tension and CMC. For example, in a Cl2H25·OSO3Na solution, increasing the NaCl concentration, such as adding 0.02 mol/L, can reduce the CMC from the original 0.0081 mol/L to 0.0038 mol/L, and with a concentration of 0.2 mol/L, the CMC drops to 0.00083 mol/L. Additionally, adding a small amount of salt (NaCl) to liquid detergents can also increase the concentration of the detergent, but the amount should not be excessive, or it may lead to precipitation. Generally, liquid detergents can add about 1% NaCl, while powdered detergents can add 20% to 40% Na2SO4.

2022

Acid dye varieties in the textile printing and dyeing industry of our country

Acid dyes are mainly used for dyeing wool, silk, and nylon, and are also used for coloring leather and paper. They hold an important position in both production and import-export volumes among various domestic dyes.

2022

Traditional natural plant medicine and health care antibacterial finishing of textiles

Humanity is facing an increasingly deteriorating ecological environment, hoping for the emergence of natural therapies that can restore the body's healing abilities; hoping for the advent of functional textiles that can restore health and enhance immunity. The functional textiles referred to in this article are those processed with extracts from natural medicinal plants as functional agents, achieving effects such as antibacterial and deodorizing, moisturizing, moisture absorption, mothproofing, improving skin feel, anti-allergy, and treating dermatitis. It can be said that this is a health-preserving and comfortable processing method.

2022

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