PVCs are irregular contractions that begin while in the ventricles in place of the atria. The contractions commonly conquer prior to another predicted heartbeat.
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Nevertheless, PVC is recyclable below particular circumstances. It could be mechanically recycled by grinding it into compact pieces, which can be then melted and remolded. Sometimes, PVC will also be chemically recycled, breaking it down into its constituent monomers for reuse.
The polymers are linear and therefore are solid. The monomers are predominantly organized head-to-tail, which means that chloride is situated on alternating carbon centres. PVC has generally an atactic stereochemistry, which implies the relative stereochemistry of your chloride centres are random. Some diploma of syndiotacticity of the chain provides a few per cent crystallinity that is influential to the Qualities of the fabric.
Expanded marine PVC board or expanded PVC can be a type of PVC that has been expanded using a Exclusive foaming agent سعر شبابيك pvc to raise the thickness of the material when lowering its density. The foaming agent continues to be included in the look purposefully to lower how much plastic is employed.
پلیوینیل کلراید بهطور اتفاقی در دو موقعیت کوچک در قرن ۱۹ کشف شد. نخستین بار در سال ۱۸۳۵ بهوسیله هنری ویکتور رگنالت و در ۱۸۷۲ بهوسیله اوگن بومان.
聚氯乙烯可由乙烯、氯和催化劑經取代反應製成。由於其防火耐熱作用,聚氯乙烯被廣泛用於各行各業各式各樣產品:
در ژانویهٔ ۲۰۰۶ اتحادیهٔ اروپا یک تحریم برای ۶ نوع فتالیت نرمکننده در اسباببازیها قرار داد. در سال ۲۰۰۳ کمیسیون امنیتی محصولات مصرفی آمریکا عریضه برای تحریم مشابه در ایالات متحده را انکار کرد.
در ویکیانبار پروندههایی دربارهٔ پلیوینیل کلراید موجود است.
初心者でも簡単、金属加工を個人で依頼する方法!流れと注意点を詳しく解説
上図はドクターナイフ法と呼ばれる方式で、厚みの調節が自由に行えます。表面に凹凸の模様を入れるエンボス加工にも対応が可能です。
熱成形は、押出成形やカレンダー成形であらかじめ生産した板状の製品を加熱し、空気や気圧を利用して型の形に成形する加工方法です。
コーティング加工は、繊維材料などに樹脂溶液を塗布して熱乾燥処理する加工方法です。
Whilst PVC has quite a few useful makes use of, In addition, it has a substantial environmental impact. The manufacturing and disposal of PVC may result in the discharge of damaging chemical substances into the ecosystem. Also, on account of its sturdiness, PVC waste can persist in the ecosystem for prolonged intervals.