TPE與PVC相比,更耐高溫和低溫、有更好的彈性,近年來環(huán)保呼聲越來越高,所以在很多領域節(jié)能環(huán)保的熱塑性彈性體TPE開始取代PVC。
使用TPE可獲得的一連串優(yōu)勢:
- 可簡易加工熱塑性塑料
- 可縮短材料成型周期
- 減低生產耗能
- 熱穩(wěn)定度,提供較大的成型區(qū)域
- 可多料加工,從而節(jié)省組裝費用
- 可接合兩種材料 (軟硬接合)
- 材料可回收
- 多種著色可能,包括為了達到更多先進設計的色澤效果
乙烯類的TPE材料一般成為TPS。TPS又可細分為SEBS、SBS、SEPS 及 SEPS-V。凱柏膠寶主要生產的是SEBS(乙烯嵌段共聚物)材料。在這個材料中,乙烯尾段連接在一個彈性的區(qū)段(乙烯-丁烯),SEBS被使用在熱熔連接或為雙料注塑加工材料中軟性的成分。
類別:
聚合物依據他們網絡的結構可分為四類:熱塑性塑料、彈性體、熱硬化性樹脂以及熱塑性彈性體(TPE)。熱塑性塑料的結構是由分子間交互作用產生的微弱物理力支撐的單一面向聚合體鏈接組成。如果遇熱或遇剪切力,則變成自由流體,可以被塑。 冷卻后,材料會再度變硬。因為這個過程純屬物理反應,所以可以隨時重復(如:聚丙烯)。熱硬化性樹脂是緊密交聯(lián)的聚合物,遇高溫也不會融化,可依舊維持其網絡結構。在室溫下,這種材料硬且易碎(如:環(huán)氧樹脂)。而同時也被稱為橡膠的彈性體,為化學交聯(lián)具有彈性的結構,在硫化后不能被塑型,其大分子交聯(lián)且盤繞。這種材料能夠短暫地經壓縮和壓力被塑型, 在壓力解除后立即恢復原有的組織(如:亞硝酸還原酶)。TPE包含熱塑性塑料尾段(聚乙烯)及一個彈性的中間段(乙烯-丁烯)。這種結構使得此種材料能夠自由流動且可被塑。待材料冷卻后,物理交聯(lián)的作用形成;將彈性段嵌入固體的3D網絡中,TPE因此兼具彈性體及熱塑性塑料的屬性。
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