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      關于襯膠防腐的說明

      來源:成都市新都永通機械廠 瀏覽次數:6956次 更新日期:2013-09-05

       1.襯膠

      顧名思義膠就是塑料因此廣義的襯膠可理解為將塑料襯里與接觸物料面達到防腐效果。
      2.襯膠為什么能防腐
      剛才我們已經說到襯膠就是襯塑料,我們知道大多數化工設備都是鋼結構;但是大多數化工反應中都會伴隨著腐蝕的進行,據了解每年因腐蝕而浪費的金屬占該金屬產量的三分之一,這個數字是非?膳碌。為了可持續發展構建節約型社會襯膠工藝出現極大的轉折,大大的降低金屬腐蝕的損耗率,我們知道塑料通常有聚乙烯(PE)、聚烯烴(PO)、聚四氟乙烯(PTFE)以及聚四氟乙烯的改性塑料如:PVC、PFA、ETFE、PVDF以及橡膠和其他鹵代烴的聚合物。
      3.襯膠防腐學名糾正
      通過以上介紹我們知道襯膠的實質是襯塑料,因此工業防腐學名統一稱為鋼襯塑防腐。比如鋼襯聚四氟儲罐、鋼襯聚烯烴反應釜等都統一襯為鋼襯塑儲罐或鋼襯塑反應釜。
      4.襯膠防腐的選擇
      (1)非氧化性酸
      低濃度非氧化性酸的氧化性主要表現氫離子的氧化性,如稀鹽酸、稀硫酸、低濃度的氫氟酸等均可以用烯烴內聚合物防腐,如聚乙烯、聚丙烯、聚烯烴等。
      (2)氧化性酸
      氧化性酸主要表現酸根的氧化性如硝酸、濃硫酸、濃鹽酸等這內酸防腐需要的襯膠類型有聚四氟乙烯(PTFE)、ETFE、PVDF、PFA等。
      5.幾種現代襯膠成熟工藝比較
      (1).烯烴共聚物:主要由三類,聚乙烯(PE)、聚烯烴(PO)、聚丙烯(PP)此類防腐一般采用龜甲襯里,厚度可達2-10mm,理論使用溫度一般在100℃,建議溫度為80℃造價一般在600元/平方米左右。
      (2)聚四氟乙烯的改性聚合物:ETFE、F40、PVDF、ECTFE、PFA,此類物質防腐性能較好,其出生背景在于聚四氟乙烯防腐工藝沒有實現的時候,為滿足局部需要而特意改性而生的,理論上能抗大多數強酸強堿的腐蝕等,但是面對混合類酸等復雜的化學環境并沒有明確實驗證明其可靠性,例如效果最好的是F40噴涂,其最接近PTFE的結構因此性能相對最好,但噴涂的厚度非常有限可修復性低,該類防腐造價一般在1000-3000元/平方米。
      (3)聚四氟乙烯(PTFE)防腐:PTFE車削板整體成型襯里于設備工藝是中國四氟防腐先鋒潘兆金經過多年研究,從表面改性到工藝成型的完整論證直到各大使用化工企業的成功案例于近幾年在中國開始推廣的新技術(http://www.visitpeterhead.com/productread.asp?id=271),實現了中國PTFE 防腐的空白,由于聚四氟乙烯具有奇特的防腐效果,號稱塑料王的PTFE實現在鋼襯塑防腐工藝中自然也是防腐至極品乃至化工設備中的奇葩!該類設備的造價通常在3500-20000元/平方米的樣子,相對于以上兩種使用性很更廣,穩定性更好,價格較高。
      通過以上說明相信廣大網友都對襯膠防腐有個比較全面的了解,望有助于你結合實際情況選擇合適的材料以最大限度的節約成本。
      標簽:襯膠防腐  
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