Aging principle and anti-aging measures of PP non-woven fabric
Aging principle
In the processing of PP non-woven fabrics, due to the influence of the material's own structure and the influence of temperature, light, oxidation and other factors during processing, it is easy to age and degrade, and chalking, discoloration and Embrittlement and other phenomena reduce the elongation at break and breaking strength, which not only shortens the service life of the product, but also causes a large waste of materials, and it is difficult to effectively explain the waste products in natural conditions, which is likely to cause environmental pollution. From the perspective of its aging mechanism, it is mainly caused by the aging of its matrix resin PP material, coupled with the structure of the PP material itself, residual impurities, and the use of inorganic fillers, additives, etc., so that the material is easily affected by temperature and oxygen during processing. Thermal oxygen aging, screw shearing, etc. At the same time, in the process of use, if it is exposed to ultraviolet light and oxygen for a long time, it is also prone to photo-oxidative aging.
(1) Among them, thermal-oxidative aging and mechanical shearing are mainly due to the fact that the PP material is sheared and extruded by the barrel and screw during processing, so that the carbon-carbon chemical bond on the macromolecular chain is broken. , coupled with the influence of temperature, the macromolecular carbon radicals after the molecular chain breakage react with oxygen to form hydroperoxides, which are further decomposed into RO? Oxygen-containing radicals and -OH hydroxyl radicals accelerate the auto-oxidation reaction, reduce the relative molecular weight of the material, and reduce the breaking strength and elongation at break.
(2) Photo-oxidative aging. Ultraviolet rays can cut the PP molecular chain, and photo-oxidation reaction occurs under the action of oxygen, which reduces the anti-photo-oxidative aging performance of PP. From the perspective of the production of PP non-woven fabrics, it is mainly made by spinning, and its diameter is relatively small, and it is easy to contact with oxygen and ultraviolet light in a large area, resulting in photo-oxidative aging and breaking the PP molecular chain.
Measures to improve the anti-aging properties of PP non-woven fabrics
In order to effectively improve the anti-aging properties of PP non-woven fabrics, it is necessary to start from the surface of the product, and appropriately increase the thickness of the product to prolong its aging. The service life, and through coating, coating, composite material with good weather resistance on the outer layer, to attach a protective layer to delay its aging process. Of course, the polyester fabric layer with good photo-oxidative aging resistance can also be needled on the surface of the PP non-woven fabric to absorb ultraviolet radiation and achieve the anti-aging effect [6]. At the same time, the anti-aging properties of PP non-woven fabrics can also be improved by adding stabilizing additives, including anti-aging additives, nanoparticles, etc.
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