標準號：BS EN ISO 7327-1996
中文標準名稱：塑料.環(huán)氧樹脂用固化劑和促進劑.酸酐中游離酸測定
英文標準名稱：Plastics - Hardeners and accelerators for epoxide resins - Determination of free acid in acid anhydride
標準類型：G31
發(fā)布日期：1996/1/15 12:00:00
實施日期：1996/1/15 12:00:00
中國標準分類號：G31
國際標準分類號：83.040.30;83.080.10
適用范圍：The principle of the method specified is reacting a small amount of free acid present in a test portion of acid anhydride hardener or accelerator with rhodamine 6G to colour the test solution pink, measuring the absorbance of the coloured solution at a wavelength of about 510 nm using a spectrometer, determining the free-acid content from a calibration curve. The method is suitable for most anhydrides except for polyester and oligomeric anhydrides which may give too wide a scatter of results.