ISO 1600:1990 塑料.醋酸纤维素.利用热的不同循环在生产模制样品中光吸收量的测定

标准编号：ISO 1600:1990

中文名称：塑料.醋酸纤维素.利用热的不同循环在生产模制样品中光吸收量的测定

英文名称：Plastics — Cellulose acetate — Determination of light absorption on moulded specimens produced using different periods of heating

发布日期：1990-11

标准范围

本方法适用于乙酸产率为54%±2.5%的醋酸纤维素。它也可能适用于其他颜色不强烈且可在规定条件下模制的透明塑料。两次吸收测量，一次在可见光谱的红端，另一次在蓝端，足以表征材料对光的吸收。描述了材料的制备、加入增塑剂的两种方法以及试样的模压成型。对于初始光密度的测定，使用给定最小可行加热量的试样。厚度为25 mm时的光密度计算为初始光吸收。进一步加热后的光吸收通过对模塑过程中使用较长时间加热制备的试样进行类似测量来获得。

This method is intended for cellulose acetate having an acetic acid yield of 54 % ± 2.5 %. It may also be applicable to other transparent plastics which are not strongly coloured and which can be moulded under the specified conditions. Two measurements of absorption, one at the red end and one at the blue end of the visible spectrum, are sufficient to characterize the absorption of light by the material. Describes the preparation of the material, two methods for the incorporation of plasticizers and die moulding of the test specimen. For the determination of the initial optical density, specimens given the smallest practicable amount of heating are used. The optical density at 25 mm thickness is calculated as the initial light absorption. The light absorption after further heating is obtained by similar measurements on specimens prepared using a longer period of heating during moulding.

标准预览图