橡胶配合剂.炭黑.碘吸收值的测定

[中文适用范围]： 本国际标准规定了橡胶工业用碳黑碘吸附数的测定方法。描述了两种滴定方法：——方法A：使用 burette 和淀粉作指示剂的滴定；——方法B：使用自动滴定仪的电位滴定法。碘吸附数与碳黑的比表面积有关，但当易挥发或可溶于溶剂的物质含量较高时，该值会显著降低。因此，碘数并不总是反映碳黑的比表面积。碳黑老化也会对碘数产生影响。在出现争议时，建议优先采用方法B（电位滴定法）。 [外文原描述]： ISO 1304:2016 specifies methods for the determination of iodine adsorption number of carbon blacks for use in the rubber industry. Two titration methods are described: - method A: titration using a burette and starch as indicator; - method B: potentiometric titration with an automatic titrator. The iodine adsorption number is related to the surface area of a carbon black and is generally in agreement with the nitrogen surface area. However, it is significantly depressed in the presence of a high content of volatile or solvent-extractable materials; the iodine adsorption number therefore does not always provide a measure of the specific surface area of a carbon black. Ageing of carbon black can also influence the iodine number. In case of dispute, the preferred method is method B (potentiometric titration).