聚酰胺PA66美國杜邦原材料代理商

特性編輯

PA66塑料在聚酰胺材料中有較高的熔點。PA66塑料在成型后仍然具有吸濕性，PA66塑料的粘性較低， PA66塑料熱性質(zhì)熔點即結(jié)晶熔解時的溫度，對結(jié)晶性高分子PA66塑料，顯示清晰的熔點，根據(jù)采用的測試方法，熔點在259~267℃的范圍內(nèi)波動。通常采用差熱分析法測出的PA66塑料的熔點為264℃。如果將體積膨脹系數(shù)顯示極大值的溫度當(dāng)作熔點，則尼龍-66的熔點溫度范圍為246~263℃。接近理論熔解溫度259℃。PA66塑料的注塑特性干燥處理：如果加工前材料是密封的，那么就沒有必要干燥。然而，如果儲存容器被打開，那么建議在85C的熱空氣中干燥處理。如果濕度大于0.2%，還需要進行105C，12小時的真空干燥。

　　熔化溫度：260~290C。對玻璃添加劑的產(chǎn)品為275~280C。熔化溫度應(yīng)避免高于300C。

　　模具溫度：建議80C。模具溫度將影響結(jié)晶度，而結(jié)晶度將影響產(chǎn)品的物理特性。對于

　　薄壁塑件，如果使用低于40C的模具溫度，則塑件的結(jié)晶度將隨著時間而變化，為了保持

　　塑件的幾何穩(wěn)定性，需要進行退火處理。

　　注射壓力：通常在750~1250bar，取決于材料和產(chǎn)品設(shè)計。

　　注射速度：高速（對于增強型材料應(yīng)稍低一些）。

　　流道和澆口：由于PA66的凝固時間很短，因此澆口的位置非常重要。澆口孔徑不要小于0.5*t（這里t為塑件厚度）。如果使用熱流道，澆口尺寸應(yīng)比使用常規(guī)流道小一些，因為熱流道能夠幫助阻止材料過早凝固。如果用潛入式澆口，澆口的Zui小直徑應(yīng)當(dāng)是0.75mm。PA66塑料應(yīng)用PA66是PA系列中機械強度Zui高、應(yīng)用Zui廣的品種，因其結(jié)晶度高，故其剛性、耐熱性都較高。

　　品種

　　包括脂肪族聚酰胺、脂肪-芳香族聚酰胺及芳香族聚酰胺。脂肪族聚酰胺品種多、產(chǎn)量大、應(yīng)用廣泛，既可作纖維，也可作塑料。聚酰胺纖維也稱耐綸，它與聚酰胺塑料的產(chǎn)量比為9∶1。脂肪-芳香族聚酰胺品種少，產(chǎn)量也小。芳香族聚酰胺常簡稱為聚芳酰胺，主要用作纖維，后者稱芳香族聚酰胺纖維，俗稱芳綸。聚酰胺品種的名稱，工業(yè)上習(xí)慣用單元鏈節(jié)所含碳原子數(shù)來表征，可以大體上按聚合物單體分為p型和mp型兩種。p型聚酰胺是由氨基酸H2N(CH2)p-1COOH（或內(nèi)酰胺）制成的。單元鏈節(jié)結(jié)構(gòu)為：[—HN(CH2)p-1—CO—]，如聚酰胺6[—HN(CH2)5CO—]n ；聚酰胺11[—HN（CH2）10CO—]n等。它們的名稱中6和11分別表示單元鏈節(jié)中的碳原子數(shù)。mp型聚酰胺是由二元酸HOOC—（C-H2）m-2COOH與二元胺H2N(CH2)pNH2制成的，單元鏈節(jié)結(jié)構(gòu)為：[—OC—（CH2）m-2CONH(CH2)pNH—]，如聚酰胺66[—OC（C-H2）4CONH(CH2)6NH—]n，聚酰胺1010[—OC（CH2）8CONH(C-H2)10—NH—]n等。它們的名稱中66和1010分別表示單元鏈節(jié)中酸和胺的碳原子數(shù)。工業(yè)生產(chǎn)的聚酰胺塑料主要品種有聚酰胺66、聚酰胺6、聚酰胺610、聚酰胺1010、聚酰胺11、聚酰胺12和共聚酰胺等。按聚酰胺中加入的添加劑不同，聚酰胺又有增強、耐磨、微晶、防老化等不同的改性品種；按加工成型的方法，可分為注塑、擠出、模壓、澆鑄、燒結(jié)等品種；按其形態(tài)還可分為粒料、薄膜、粉末和坯料等。

聚酰胺PA66美國杜邦原材料代理商

聚酰胺PA66美國杜邦原材料代理商

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