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August 12 reports: sunscreen, summer beauty is almost the primary task of the United States, in order to cover up the body, all kinds of sunscreen masks, sunscreen sunscreen sun protection clothing and other textiles applications more and more, how to make a reasonable choice and use Sunscreen textiles, but also increasingly become the beauty of people keen to understand the knowledge. This summer, the colorful "skin clothing" almost become a must-have for every beauty person, but do you really pick out the "skin coat"? UV or pathogenic, sunscreen more about health Everyone knows that the sun, can promote the synthesis of cellulose D and bone development, children sun exposure can effectively prevent rickets, tanned red and black skin is a sunny health Symbol, do not know these are based on a certain amount of foundation. Sunscreen For most people's understanding is the sun, but not all the sun? According to Donghua University Institute of Textile Technology, Textile Technology, Ministry of Education, Associate Professor Zhang Bin, Associate Professor introduction, the sun reaches the ground after the human skin has a greater impact on the main UV, the radiation energy, although only 6% of the total solar radiation, But it is the main light sunscreen. "If our skin is too exposed to ultraviolet light, it will be black and rough, losing its elasticity. This only affects the appearance. More importantly, it accelerates the formation of cataracts, causing keratitis and conjunctivitis. It can cause skin diseases and even skin cancer and bring many health benefits Problem, so sunscreen is not only related to fair-skinned, more about health. "Zhang Bin said. According to reports, the UV wavelength can be divided into long-wave UVA (wavelength 320 ~ 420nm), UVB UVB (wavelength 275 ~ 320nm) and short-wave UV UVC (wavelength 200 ~ 275nm). UVA can penetrate the dermis through the epidermis, UVA daily exposure to more than 95% of UVA, can easily lead to damage the skin aging; long-term exposure, but also lead to the formation and deposition of melanin, the skin black and dull, it is said Tanning paragraph. UVB is called the red sun, long exposure, the skin will turn red, tingling, can cause immediate skin sunburn, which is the main band to be prevented. The UVC has been absorbed by the ozone layer before reaching the ground and has virtually no effect on the skin. Therefore, sunscreen is mainly to protect against UVA and UVB damage. In recent years, due to massive human emissions of chlorofluorocarbons such as freon, the atmosphere over the Earth is increasingly destroyed, the ozone layer also thinning, thinning, the amount of ultraviolet radiation reaching the ground gradually increased, the resulting disease Also increasing, so the sun has become something people have to care about. In view of this, sunscreen textiles came into being, the ability to effectively prevent UV radiation has become the main consideration of the choice of sunscreen-type textiles. Cotton sun weak, black more sunburn According to Zhang Bin introduction, UV light onto the textiles, some are absorbed, part of the reflection, part through the fabric. Only through the fabric of ultraviolet light on the skin have an impact. If more are absorbed and reflected, the less UV light is transmitted and the better the protective properties. "Therefore, the identification of textile UV protection depends on whether it enhances the UV reflection and absorption.UV ability of textiles, and fiber type and structure, yarn structure, fabric structure and size and color and other factors." According to reports, at present, we commonly used in textile fibers, the benzene ring in the polyester molecules, wool amino acids and other groups on the wavelength of less than 300nm UV good absorption; pectin slant fiber bias Hole structure and the existence of grooves and cracks on the light waves have a good elimination; cotton fabric UV protection is relatively poor, is the most easily through the UV fabric. Therefore, cotton products without the targeted processing, the UV performance is poor. In the aspect of the structure of the original yarns, the regularity of the anti-ultraviolet properties of the textile is that the short fiber fabric is superior to the filament fabric; the fine fiber fabric is better than the coarse fiber fabric; the general profiled cross-section synthetic fabric is better than the circular cross-section fabric; Better than twisting filament products. Fabric structure is also one of the factors that determine the UV radiation resistance of textiles. The heavier and heavier the fabric, the lower the porosity and the lower the UV transmittance, the greater the protective effect of the textile on the human body. "Therefore, we can easily understand why people pay attention to sunscreen in the summer, but less in other seasons." According to Zhang Bin said that at present, the market is mostly translucent sunscreen protective fabric, if not for any Anti-UV design and processing, you can only cover, it is difficult to shield the UV. However, heavy and dense fabric breathable, less moisture permeability perspiration, it must be UV protection and clothing cool, comfortable with each other. So, how to choose suitable for summer textiles? In this regard, Zhang Bin recommends taking into account both thin and cool, comfortable. "After the fabric is dyed, and with the deepening of the fabric color, the UV transmittance of the fabric decreases, that is, the anti-UV performance is improved. Among the different colorings, the black has better UV protection performance, followed by the dark blue, red and dark green , Purple, and green, pink, light green, white is poor, especially white, white as the fabric, the worse the anti-UV performance. "Zhang Bin said. "If you do not go through a special anti-UV treatment, it is difficult to get a better sunscreen performance, but after UV protection of textiles finishing, physical and mechanical properties of textiles, feel and comfort and other service performance will generally be reduced, and finishing Anti-UV textiles made by the method are generally not washable, it is recommended that sunscreen textile do not wash or wash as little as possible, so as not to affect its UV protection performance.In addition, such as UV sun umbrellas products, rain and rain as direct contact with anti-UV layer , Its UV performance will be reduced, it is recommended not to use rainy day.In order to help people better sunscreen, researchers have not stopped the pace of the paces.According to the reporter, in order to improve the clean production capacity of textiles, Donghua University research workers are Has developed an eco-friendly natural UV protection finishing agent, which has been successfully applied to silk and wool products because of its high compatibility with the human body and the environment due to its origin in the plant kingdom. In silk products, not only Can significantly improve the anti-UV properties of silk products, and can be improved Silk fabrics are not light-resistant properties.
October 06, 2021