The smart Trick of pvc That No One is Discussing
The smart Trick of pvc That No One is Discussing
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UV-ljus och temperatur anses vara de faktorer som svarar för den huvudsakliga nedbrytningen vid utomhusåldring av plast. I likhet med andra plaster bryts PVC ned av solljus. Den fotokemiska nedbrytningen accelereras vid höjd temperatur.
押出成形は、押出機のなかに溶融した原料を入れ、口金から押し出して成形する加工方法です。
On the other hand, PVC is recyclable beneath specified problems. It may be mechanically recycled by grinding it into little pieces, which happen to be then melted and remolded. Occasionally, PVC can even be chemically recycled, breaking it down into its constituent monomers for reuse.
مشکلات بهداشتی پلاستیک و ترکیب پلی‌هالوژنه (پی‌اچ‌سی)
PVC was synthesized in 1872 by German chemist Eugen Baumann immediately after prolonged investigation and experimentation.[12] The polymer appeared as a white solid inside a flask of vinyl chloride that were remaining with a shelf sheltered from daylight for 4 months. In the early 20th century, the Russian chemist Ivan Ostromislensky and Fritz Klatte of the German chemical company Griesheim-Elektron both tried to employ PVC in professional products and solutions, but difficulties in processing the rigid, sometimes brittle polymer thwarted their efforts.
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Poly(vinyl chloride) (PVC) has long been a fascinating topic for polymer science investigate. Its features are heightened by its inherent structural faults resulting pvc شبابيك from immediate manufacturing (by totally free-radical polymerization), which also cause its thermal instability. Several of the basic limiting options of PVC are already recommended to generally be alleviated by improved chemistry all through PVC synthesis, Together with the use of equally inorganic and organic thermal stabilizers. The attributes, characterization, modification, recycling, and numerous apps of PVC are all examined in this paper combined with the past and most up-to-date exploration discoveries. It has been proposed that many of the basic restricting Qualities of PVC is often lessened by applying equally inorganic and natural and organic thermal stabilizers at the side of improved chemistry for the duration of PVC manufacture.
حتی با وجود این‌که پی‌وی‌سی اسباب‌بازی‌های نرم برای نوزادان برای سال‌ها ساخته شده‌است، این نگرانی وجود دارد که این افزودنی‌ها از اسباب‌بازی‌های نرم به دهان کودکانی که آن را به دهان می‌برند نشت کند.
در دنیای امروز کارت‌های پی‌وی‌سی کاربرد زیادی در زندگی روزانهٔ مردم دارند؛ زیرا این کارت‌ها برای خرید، عبور و مرور، حمل و نقل عمومی (مترو یا اتوبوس)، بانک و … مورد استفاده قرار می‌گیرند.