ISO 3251:2019 色漆、清漆和塑料 非挥发性物质含量的测定

标准编号：ISO 3251:2019

中文名称：色漆、清漆和塑料 非挥发性物质含量的测定

英文名称：Paints, varnishes and plastics — Determination of non-volatile-matter content

发布日期：2019-05

标准范围

本文件规定了按涂料、清漆、涂料和清漆用粘合剂、聚合物分散体和缩合树脂（如酚醛树脂（酚醛树脂、酚醛树脂溶液等））质量测定非挥发性物质含量的方法。该方法也适用于含有填料、颜料和其他助剂（例如增稠剂、成膜剂）的配方分散液。注1:产品的非挥发性物质含量不是绝对量，而是取决于测定所用的温度和加热时间。因此，当使用该方法时，由于溶剂保留、热分解和低分子质量组分的蒸发，只能获得非挥发性物质含量的相对值，而不是真实值。因此，该方法主要用于测试同一类型产品的不同批次。注2:该方法适用于合成橡胶网格，前提是认为加热一段特定时间是合适的（ISO 124规定了加热，直到连续加热后2g试样的质量损失小于0.5mg）。注3:测定非挥发性物质的室内方法通常包括用红外或微波辐射干燥。这种方法不可能标准化，因为它们并不普遍适用。在这种处理过程中，几种聚合物成分容易分解，因此给出了错误的结果。

This document specifies a method for determining the non-volatile-matter content by mass of paints, varnishes, binders for paints and varnishes, polymer dispersions and condensation resins such as phenolic resins (resols, novolak solutions etc.).The method is also applicable to formulated dispersions containing fillers, pigments and other auxiliaries (e.g. thickeners, film-forming agents).NOTE 1 The non-volatile-matter content of a product is not an absolute quantity but depends upon the temperature and period of heating used for the determination. Consequently, when using this method, only relative and not true values for non-volatile-matter content are obtained owing to solvent retention, thermal decomposition and evaporation of low molecular mass constituents. The method is therefore primarily intended for testing different batches of the same type of product.NOTE 2 This method is suitable for synthetic rubber lattices, provided heating for a specific period of time is considered appropriate (ISO 124 specifies heating until the loss in mass of a 2 g test portion following successive periods of heating is less than 0,5 mg).NOTE 3 In-house methods for determining non-volatile matter often include drying with infrared or microwave radiation. Standardization of such methods is not possible, since they are not generally applicable. Several polymer compositions tend to decompose during such treatment and therefore give incorrect results.

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