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歡迎來到云南華表聯(lián)塑管道官網(wǎng)！主要從事云南聯(lián)塑管道、聯(lián)塑PVC管、聯(lián)塑水管系列產(chǎn)品的銷售服務，公司業(yè)務涉及西南地區(qū)以及越南、緬甸、老撾等周邊國家。

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聯(lián)塑PVC管道發(fā)黑是什么原因導致的你清楚嗎?廠家揭曉

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信息來源：www.beconsultan.com | 發(fā)布時間：2022年11月07日

  在云南聯(lián)塑PVC管道配方主要由PVC樹脂和助劑組成。其中助劑按功能又分為：熱穩(wěn)定劑、潤滑劑、加工改性劑、沖擊改性劑、填充劑、耐老化劑、著色劑等。那么你知道PVC管道變黑主要有哪幾個方面的原因?


聯(lián)塑PVC管道發(fā)黑是什么原因導致的你清楚嗎?廠家揭曉



  首先是PVC產(chǎn)品質量，由于PVC分子結構中存在叔氯和烯丙基氯，故PVC管材在加工和后期的使用過程中易發(fā)生分解，脫HCL易形成共軛雙鍵，多個雙鍵形成，導致管材變色開始發(fā)生，其顏色變化順序為：白色-粉紅色-淺黃色-紅色-黑色，故PVC質量，穩(wěn)定劑質量和用量至關重要。

  質量不合格鈦白誘發(fā)的變色，在合適的條件下，TiO。發(fā)生在表面的光催化反應可以看做是一個周期性的氧化還原反應。由于氧化還原反應過程產(chǎn)生了黑色的鉛，因而導致淺色PVC—U管材表面出現(xiàn)了灰黑色斑。當停止光照一定時間后，PVC—U管材表面的灰黑色斑會慢慢消失。

  硫污染和鉛鹽穩(wěn)定劑、鎘穩(wěn)定劑隨著工業(yè)的發(fā)展，酸雨，硫污染日趨嚴重，且型材在貯存和運輸過程中可能與硫磺，硫化物相接觸，故發(fā)生硫化污染的可能性較大。硫污染主要是Pb2﹢+S2-→PbS(黑)
2S2﹣+PbCl?→Pb(ClS)?(紅褐色)反應形成的物質為黑色或紅裼色，可導致白色材料變色。

  群青引發(fā)的變色，云南聯(lián)塑PVC管材廠家介紹群青是含多硫化鈉而具有特殊結構的硅酸鋁。不經(jīng)特殊處理的群青耐堿性耐熱性和耐酸性差。當管材被酸雨淋后，在強烈的陽光照射下，在管材表面殘存的酸雨與群青作用形成“HS------ˉ”離子，該離子溶于水，進一步水解形成Sˉ與型材中存在的Pb2+作用。Pb2﹢+S?ˉ→PbS↓(結晶形：藍色)(無定形：則黑色)

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