Ultraviolet technology was first used in medical clinical, mutation breeding, biological research and lithography processes and sterilization of microelectronics manufacturing. In the late 1990s, the research and application of ultraviolet radiation technology in the textile printing and dyeing industry began to attract people's attention and application. This paper mainly introduces the UV treatment rubber roller, using its fluorescence effect to identify the fiber type, fiber surface modification and curing treatment of fiber fabric or garment. The rubber roller is the main drafting component in the spinning process, and its performance directly affects the quality of the yarn. The surface treatment of nitrile rubber rolls at home and abroad is generally secondary acid treatment. However, the acid-treated nitrile rubber roller has a short service life, and the dryness of the yarn is gradually deteriorated as the use time is prolonged. As early as the 1970s, the surface treatment technology of ultraviolet ray-coated rubber roller was developed abroad. Many domestic units have also carried out experiments. The results show that the elasticity of the rubber roller increases after UV irradiation, the surface is smoother, and the flower resistance is resistant. Improved.
The mechanism of action of UV-irradiated rubber roller is: the nitrile rubber is composed of butadiene and acrylonitrile. In its macromolecule, it has only double bond and a strong polarity of CN, and its bond energy is less than 2.7 x 105 J/ The tool is easily catalyzed by light energy to generate a chemical reaction. At a wavelength of 200-450 nm, the nitrile rubber produces a catalytic chemical reaction, and the chemical bond is broken, so that the rubber molecules on the surface of the rubber roller are re-decomposed and crosslinked to produce a new compound. This new compound is generally considered to be The isomer of the original nitrile rubber. That is to say, ultraviolet irradiation can change the spatial network structure of the rubber molecules and the order of the molecules, increase the internal energy of the macromolecular chain, and thus increase the elasticity of the rubber roller. In addition, the rubber macromolecule absorbs the quantum energy and the motion is intensified, and the distance between the molecules is shortened. The molecular particle size becomes smaller, which means that the surface of the rubber roller has a smooth hand feeling; at the same time, the polar group in the rubber roller and the electrolyte compounding agent molecule are closer together, which enhances the ability to eliminate external static electricity and makes the rubber roller resist during spinning. The performance of the winding is significantly improved to improve the spinning quality.
At the same time, it should be noted that the intensity of ultraviolet irradiation, the irradiation time, the hardness and diameter of the rubber roller directly affect the quality of the treatment. Therefore, the influencing factors should be strictly controlled in the specific production process. Application of Ultraviolet Fluorescence Effect Ultraviolet light quantum has a large energy. When ultraviolet light is irradiated onto many substances, the molecules are excited to emit fluorescence. This phenomenon is called the ultraviolet fluorescence effect HJ. The fluorescent effect of ultraviolet light is a photoluminescence. When ultraviolet light illuminates certain substances, these substances are selectively absorbed and emit visible light of different wavelengths and different intensities. The fluorescence emitted by the surface of the substance reflects the characteristics of the substance, and the substance can be qualitatively and quantitatively analyzed. There are many methods for identifying textile fiber types, such as sensory identification, combustion, microscopic observation, dissolution, drug coloring, specific gravity, and infrared spectroscopy. Among the many methods of identification, the ultraviolet method has an important feature that directly identifies the fiber type of a fabric or garment without having to cut a sample and destroy its appearance.
Ultraviolet light can also be used to check fiber raw materials or fabrics for mold b]. 2 Detection and removal of foreign fibers and detection and removal of foreign fibers are a hot topic at home and abroad. The colored foreign fiber is activated by the photoelectric sensor, and can be basically removed on the combing foreign fiber removing machine and the winding electronic clearer. It is difficult to detect and remove the natural fibers such as polypropylene. In recent years, under the ultraviolet light irradiation, artificially detecting synthetic fiber foreign fibers such as polypropylene has been used in production, and it is possible to check the presence or absence of foreign fibers in the semi-product sliver, roving, bobbin, warp beam and cloth surface. A certain effect has been achieved.
Ultraviolet radiation can be applied to the surface modification of various polymer fiber materials to impart moisture absorption, antibacterial, deodorizing, antistatic and adhesive properties. The effect of ultraviolet rays on the fibers occurs only in the range of tens to thousands of angstroms of the surface thereof, and thus does not affect the basic physical properties and mechanical properties of the fibers nJ. The energy of ultraviolet light varies according to the length of its wavelength, and its energy is basically in the same category as the chemical binding energy of most organic substances. When the energy exceeds the chemical binding energy of the polymer, the molecular chain of the ultraviolet-irradiated polymer fiber material is cracked. Under the aerobic atmosphere, the oxygen molecules in the atmosphere become ozone, active oxygen, and the polymer fiber material is oxidized. The surface generates a carboxyl group, an aldehyde group, a hydroxyl group, and a carbonyl group. The ultraviolet fiber-treated polymer fiber material can introduce abundant polar groups, such as an OH, a NH2, etc., thereby improving the hydrophilicity, hygroscopicity and antistatic property of the polymer fiber material; introducing deodorizing and antibacterial substances, The polymer fiber material can be deodorized and antibacterial. Ding Zhongxia et al. ̈1 put polyester fiber in normal temperature air, after ultraviolet irradiation (irradiation distance 40 into, irradiation time 10 min, irradiation energy 3.4 J/era2), and use chitosan solution with deacetylation degree above 80% The results of impregnation showed that the antistatic, wettability, dyeability and antibacterial properties of the surface of the polyester fiber were improved. Since chitosan is bonded in the form of ionic bonds on the surface of the polymer fiber material, it has excellent durability. Especially for hot water, it is ten times more durable than UV irradiation.
However, excessive ultraviolet irradiation causes a great change in the chemical structure of the surface of the polymer material, causing local interface damage and damaging the original properties of the polymer. It is preferable to use ultraviolet rays having an energy of 1 to 500 J/degree of damage to the properties of the polymer fiber material.
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