PP non-woven aging mechanism

In the machining process of PP non-woven fabric, due to the material itself structure and processing the influence of such factors as temperature, light, oxidation, so easy to aging degradation, and pulverization, discoloration and embrittlement phenomenon, the elongation at break and breaking strength is reduced, not only shortens the products use fixed number of year, and caused great waste materials, and waste products in effective interpretation of the natural conditions, easy to cause environmental pollution. Look from its aging mechanism, mainly caused by the matrix resin PP material aging, combined with the structure, the residual impurities, PP material itself and the use of inorganic fillers, additives and so on, making it easier for the material in the processing under the influence of temperature, oxygen and appear hot oxygen aging, screw shear, etc. At the same time, in use process, if long time exposure to ultraviolet light, oxygen, oxygen aging also prone to light. （ 1) Among them, the hot oxygen aging and is mainly due to the shear machine in PP material processing, material barrel, screw shear extrusion, a carbon bonds allow the carbon to macromolecular chain appear rupture, and influenced by temperature under, after the molecular chain rupture of macromolecular carbon and oxygen free radical reaction, and form the hydrogen peroxide, and further is broken into RO? Oxygen free radical, - OH oxyhydrogen free radical, accelerate the oxidation reaction automatically, makes the material is reduced, the relative molecular mass and its breaking strength, elongation at break decreased. （ 2) Light oxygen aging. Uv rays can cut the PP molecular chain, and light oxidation reaction occurred under the effect of oxygen, lowered the PP light oxygen aging resistance. Look from PP non-woven fabric production, mainly made from the jet, its diameter is small, easy to widespread contact with oxygen, uv light, and in light of oxygen aging, and the PP molecular chain rupture.