Light stabilizer used in the textile industry
Inhibit bacteria and ultraviolet disinfection effect, can promote the body's synthesis of anti-arrest rickets vitamin D, for the people and the planet biological essential. Nature mainly from ultraviolet sunlight, it is for 180 ^} 400nm wavelength electromagnetic waves. Length can be divided according to their wavelength ultraviolet ① near ultraviolet (UVA), also known as UVA; ② far ultraviolet (UVB), also known as UVB; ③ ultrashort ultraviolet CUVC), often called the short ultraviolet light. UVA wavelengths of 315 a 400am, UVB wavelengths of 280} 315am UVC wavelengths of 100 "280nm, UV}:. Basically can be absorbed by the body outside the epidermal and dermal tissue, UVB transmission capacity is worse than UVA, only one can be transmitted only uvn below the dermis is the main reason for aging skin.
Modern nutritionally adequate, no more than the sun to generate excess vitamin D, according to statistics, one day the sun is very Zhongtai Yang enough, and in the morning and evening is appropriate. However, due to extensive human use of modern fluorocarbon solvent and Freon, the ozone layer in the Earth's atmosphere absorbs ultraviolet effects have been seriously damaged, ultraviolet radiation that reaches the earth's surface is increasing. Excess ultraviolet radiation can tan skin wrinkles and accelerate skin aging, prone to burns, redness and blisters induced skin diseases (such as dermatitis, dry skin pigment disorder), and even skin cancer, cataracts and reduce trigger the body's immune function. In order to protect the body from excessive UV rays, UV fibers and textiles developed into the 20th century, 9. Since the era of new industries. For example in the summer field work to develop UV clothing, supply soldiers, police, geologists, construction workers wear, especially by the people of the plateau region of strong long-term use of ultraviolet radiation, prevent UV penetration, in order to reduce the harm to human body. In addition, UV also adverse effects on the textile after the fabric dyes absorb ultraviolet photochemical reaction, leading fabric fading, discoloration, it requires a higher fabric sun and color fastness. Many textile color fastness to sunlight has been plagued by poor printing and dyeing industry, the international market for clothing requirements steering comfort and functional health scratch, especially for UV protection and sun and color fastness performance demanding a direct impact on China in the international textile market competition. In addition to color fastness to sunlight, the UV-induced oxidative aging fiber optical and thermal oxidative aging, fabric strength decreased and shorten life, so easily degradable fibers such as polypropylene textiles must be approved by the anti-UV treatment.
Textile manufacturing UV ways:
l) selecting an ultraviolet absorber having a reactive functional group, a monomer copolymerizable with the fiber-forming polymer, copolymer manufacture UV and UV textile fiber obtained. May be prior to polymerization, the Ti () z and a ceramic powder and inorganic fine particles of a light-shielding agent and monomer stick together, and then polymerized into an inorganic material uniformly dispersed polymer, and then spinning manufacturing an ultraviolet shielding function fibers. In recent years, found that the special structure of the ceramic ultrafine particles were mixed within the fibers, the resulting fiber can not only shield ultraviolet, visible and infrared reflection also has insulation function. It is also possible before spinning one or more light stabilizers, in order to strengthen the resistance to aging even add antioxidants and the resin blend, and then spinning fiber manufacture UV weathering. Because of the modified polymers and fibers have good durability, and has the same general fiber washable, anti-hot sex, injury to the skin, good light stability and security
2) The fabric UV finishing, i.e. the inorganic ultraviolet shielding agent or organic UV Absorber, individually or in combination. With padding, printing method or exhaustion method attached to the fabric fibers. For decorative or industrial textiles, coating method can also be used to light stabilizer bonded fabric surface.
3) UV fiber and fabric finishing late and with the resulting fabric is UV shielding rate g. % The above. Textile and apparel level of UV protection to ultraviolet protection factor UPF size indicates, the greater the UPF value, it means that the better protective effect. For example: wear hanging UPFS. Certification tag clothes, can increase 50 times the level of protection.