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你對PMMA亞加力塑料注射成型技術了解多少?

來源:發布時間:2020-12-24 15:41:55點擊率:

PMMA通常被稱為有機玻璃,亞加力等等?;瘜W名稱是聚甲基丙烯酸甲酯。改性PMMA是由于其表面硬度不高,易擦拭,耐沖擊性差,成型流水性差等缺點而相繼產生的。甲基丙烯酸甲酯與苯乙烯、丁二烯的共聚反應,PMMA與PC的共混反應;三七二有機玻璃是由甲基丙烯酸甲酯與苯乙烯共聚而成。將少量NBR(約50%)加入372有機玻璃中,可制成373有機玻璃。由于PMMA的流動性較PS、ABS差,熔體粘度對溫度變化較為敏感,在成型過程中,熔體粘度的變化主要是從注塑溫度開始。聚丙烯酰胺是一種非晶態聚合物,熔點在160℃以上,分解溫度在270℃以上。

一,塑料加工
PMMA具有一定的吸水性能,吸水率在0.3-0.4%之間,注射溫度低于0.1%,一般為0.04%。水份的存在使熔體產生氣泡,氣紋,透明度下降等。因此,必須進行干燥。烘干溫度80-90℃,烘干時間3小時以上。
在某些情況下,回收的材料可100%使用,實際用量取決于質量要求,一般可超過30%,回收材料避免污染,否則會影響透明度和成品的性質。
注塑機械選型
對于注塑機PMMA沒有特殊要求。由于它的熔體粘度大,需要更深的螺槽和更大的噴嘴直徑。若對制品強度要求較高,則采用長徑比較大的螺桿進行低溫塑化。此外PMMA必須使用干燥的斗式烹調材料。
模具及澆口的設計
模溫可在60℃-80℃之間,主流道直徑應與內錐度相匹配, 角度為5~7,若要注塑4mm或以上制品,必須有7個角度,主流道直徑在8~10mm之間,澆口整體長度不超過50mm。
壁厚小于4mm的制品,流道直徑應為6-8mm
壁厚大于4mm的制品,流道直徑應為8-12mm
邊緣形狀、扇形和垂片形狀的澆口深度應在0.7~0.9t之間(t為制品壁厚),針形澆口直徑應在0.8~2mm之間;粘度較低的澆口應選用較小的尺寸。
普通排氣口0.05~0.07mm深6mm寬

開裂角度30′-1型腔部分介于35′-130之間。

四、膠凝溫度

可采用對空注射法測量:溫度范圍在210℃-270℃之間,具體取決于供應商提供的信息。
五、注入溫度
可快速注塑,但要避免產生高度內應力,宜采用多段注塑,如慢、快、慢等,厚件可采用慢速注塑。
6.保留時間
在260℃條件下停留時間 長不得超過10分鐘,在270℃條件下停留時間不得超過8分鐘。
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