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PBT 聚對苯二甲酸丁二醇酯 家用器具(食品加工刀片、真空吸塵器元件、電風扇、頭髮乾燥機殼體、咖啡器皿等),電器元件(開關、電機殼、保險絲盒、電腦鍵盤按鍵等),汽車工業(散熱器格窗、車身嵌板、車輪蓋、門窗部件等)。 乾燥處理:這種材料在高溫下很容易水解,因此加工前的乾燥處理是很重要的。建議在空氣中的乾燥條件爲120C,6~8小時,或者150C,2~4小時。濕度必須小於0.03%。如果用吸濕乾燥器乾燥,建議條件爲150C,2.5小時。
熔化溫度:225~275C,建議溫度:250C 。
模具溫度:對於未增強型的材料爲40~60C。要很好地設計模具的冷卻腔道以減小塑件的彎曲。熱量的散失一定要快而均勻。建議模具冷卻腔道的直徑爲12mm。
注射壓力:中等(最大到1500bar)。
注射速度:應使用盡可能快的注射速度(因爲PBT的凝固很快)。
流道和澆口:
建議使用圓形流道以增加壓力的傳遞(經驗公式:流道直徑=塑件厚度+1.5mm)。可以使用各種型式的澆口。也可以使用熱流道,但要注意防止材料的滲漏和降解。澆口直徑應該在0.8~1.0*t之間,這裏 t是塑件厚度。如果是潛入式澆口,建議最小直徑爲0.75mm。 PBT是最堅韌的工程熱塑材料之一,它是半結晶材料,有非常好的化學穩定性、機械強度、電絕緣特性和熱穩定性。這些材料在很廣的環境條件下都有很好的穩定性。 PBT吸濕特性很弱。
非增強型PBT的張力強度爲50MPa,玻璃添加劑型的PBT張力強度爲170MPa。玻璃添加劑過多將導致材料變脆。PBT的;結晶很迅速,這將導致因冷卻不均勻而造成彎曲變形。對於有玻璃添加劑類型的材料,流程方向的收縮率可以減小,但與流程垂直方向的收縮率基本上和普通材料沒有區別。一般材料收縮率在.5%~2.8%之間。含30%玻璃添加劑的材料收縮0.3%~1.6%之間。熔點(225%C)和高溫變形溫度都比PET材料要低。維卡軟化溫度大約爲170C。玻璃化轉換溫度(glass trasitio temperature)在22C到43C之間。
由於PBT的結晶速度很高,因此它的粘性很低,塑件加工的周期時間一般也較低。
 

 
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