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                                                                                                                                                                                                        聚四氟乙烯薄膜生產工藝流程

                                                                                                                                                                                                        2021/12/20 18:54:57      點擊:
                                                                                                                                                                                                        聚四氟乙烯薄膜是由模壓燒結圓柱形坯料,經機床切削成膜后再壓延而成。根據處理方法的不同可分為定向膜,半定向膜和不定向膜三種,目前PTFE 薄膜產品有多孔膜、微濾膜、彩色膜等。
                                                                                                                                                                                                              1、聚四氟乙烯彩色薄膜
                                                                                                                                                                                                              PTFE 彩色薄膜適用于以色澤區分標志的電器儀表或導線絕緣上,是一種新型的綜合性能優良的C 級絕緣材料,是無線電工業、航空工業以及尖端科學技術中不可缺少的重要材料之一。聚四氟乙烯薄膜一般采用懸浮聚合聚四氟乙烯樹脂,要求顆粒直徑在150μm 以下。顏料必須具備耐熱性好( >400℃) ,顆粒細,著色力強,對化學試劑穩定等要求。
                                                                                                                                                                                                              其生產工藝流程:
                                                                                                                                                                                                              PTFE樹脂、顏料→混合→模壓成型→燒結→冷卻→車削不定向膜→壓延半定向膜
                                                                                                                                                                                                              主要工藝參數:
                                                                                                                                                                                                              混合:目前生產彩色PTFE薄膜混合方式主要有兩種;干法混合和濕法混合。研究表明濕法混合比干法混合混料均勻但工序多,成本高,需加溶劑,為了保證制品的均勻性一般采用濕法混合。
                                                                                                                                                                                                              工藝過程是將PTFE 樹脂、顏料加溶劑→混合→干燥→除溶劑→彩料。
                                                                                                                                                                                                              模壓預成型: 合理選擇預成型單位壓力是生產PTFE 彩色薄膜重要的工藝條件。主要根據樹脂的細度、壓縮比、顏料種類細度等條件來選擇,一般在20~40MPa 。

                                                                                                                                                                                                              燒結冷卻:由于彩色薄膜含有顏料,導熱系數、熱脹系數與PTFE不一致。因此在燒結過程中升降溫度比普通PTFE 薄膜要慢,燒結溫度比普通薄膜低,升降溫度為20~30℃/h ,燒結溫度為375 ℃。而普通薄膜升溫速度在327 ℃前50~60℃/h , 在327℃后30~40℃/h ,燒結溫度380℃,降溫速度20~50℃/h。

                                                                                                                                                                                                        車削不定向膜:刀尖角以40°~45°為宜,速度比普通PTFE慢。
                                                                                                                                                                                                              壓延半定向膜:壓延溫度隨薄膜厚度而異,一般5μm 厚,110℃±5℃;30μm 厚,130℃±10℃。壓延倍數為2.5~3.0。
                                                                                                                                                                                                              主要設備:
                                                                                                                                                                                                        (1) 混合攪拌機;
                                                                                                                                                                                                        (2) 液壓機 35~40MPa ;
                                                                                                                                                                                                        (3) 燒結爐 DL151 ;
                                                                                                                                                                                                        (4) 精密數控車床 C620 ;
                                                                                                                                                                                                        (5) 壓延機 輥筒Φ100 ×120。

                                                                                                                                                                                                        亞星塑業_專業生產:特氟龍輸送帶、四氟網格帶、PTFE耐高溫布、鐵氟龍膠帶、微波輸送帶、烘干機傳送帶,訂購電話:18952601573

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