ISO 15512:2016 塑料 含水量的测定

标准编号：ISO 15512:2016

中文名称：塑料 含水量的测定

英文名称：Plastics — Determination of water content

发布日期：2016-10

标准范围

1.1 ISO 15512:2016规定了粉末、颗粒和成品形式的塑料含水量的测定方法。这些方法不测试通过ISO 62测量的塑料的吸水率（动力学和平衡）。方法A适用于测定低至0.1%的水分含量，准确度为0.1%。方法B和方法C适用于测定低至0.01%的水分含量，准确度为0.01%。含水量是加工材料的重要参数，必须保持在适当材料标准中规定的水平以下。1.2本国际标准规定了四种替代方法。？方法A是使用无水甲醇的提取方法，然后对提取的水进行卡尔费休滴定。可用于所有塑料，适用于小于4mm × 4mm × 3mm的颗粒。该方法也可用于例如不溶于甲醇的粉末形式的预聚物材料。？方法B1是使用管式炉的汽化方法。将包含在测试部分中的水蒸发并通过干燥空气或氮气载气携带到滴定池，然后对收集的水进行卡尔费休滴定。可用于所有塑料，适用于小于4mm × 4mm × 3mm的颗粒。？方法B2是使用加热的样品瓶的蒸发方法。将包含在测试部分中的水蒸发并通过干燥空气或氮气载气携带到滴定池，然后对收集的水进行卡尔费休滴定。可用于所有塑料，适用于小于4mm × 4mm × 3mm的颗粒。？方法C是测压法。水含量由压力的增加确定，压力的增加是当水在真空下蒸发时产生的。该方法不适用于含有除水以外的挥发性化合物的塑料样品，其量对室温下的蒸气压有显著贡献。应定期检查是否存在大量挥发性化合物，例如通过气相色谱法。对于新类型或新等级的材料尤其需要此类检查。

1.1 ISO 15512:2016 specifies methods for the determination of the water content of plastics in the form of powder, granules, and finished articles. These methods do not test for water absorption (kinetics and equilibrium) of plastics as measured by ISO 62.Method A is suitable for the determination of water content as low as 0,1 % with an accuracy of 0,1 %. Method B and Method C are suitable for the determination of water content as low as 0,01 % with an accuracy of 0,01 %.Water content is an important parameter for processing materials and has to remain below the level specified in the appropriate material standard.1.2 Four alternative methods are specified in this International Standard.? Method A is an extraction method using anhydrous methanol followed by a Karl Fischer titration of the extracted water. It can be used for all plastics and is applicable to granules smaller than 4 mm × 4 mm × 3 mm. The method can also be used for, e.g. prepolymer materials in the form of a powder that are insoluble in methanol.? Method B1 is a vaporization method using a tube oven. The water contained in the test portion is vaporized and carried to the titration cell by a dry air or nitrogen carrier gas, followed by a Karl Fischer titration of the collected water. It can be used for all plastics and is applicable to granules smaller than 4 mm × 4 mm × 3 mm.? Method B2 is a vaporization method using a heated sample vial. The water contained in the test portion is vaporized and carried to the titration cell by a dry air or nitrogen carrier gas, followed by a Karl Fischer titration of the collected water. It can be used for all plastics and is applicable to granules smaller than 4 mm × 4 mm × 3 mm.? Method C is a manometric method. The water content is determined from the increase in pressure, which results when the water is evaporated under a vacuum. This method is not applicable to plastic samples containing volatile compounds, other than water, in amounts contributing significantly to the vapour pressure at room temperature. Checks for the presence of large amounts of volatile compounds are to be carried out periodically, for example by gas chromatography. Such checks are particularly required for new types or grades of material.

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