塑料.热塑性塑料熔体质量流率（MFR）和熔体体积流率（MVR）的测定.第1部分:标准方法

[中文适用范围]： 本文件规定了在规定的温度和负载条件下测定热塑性材料的熔体质量流动速率（MFR）和熔体体积流动速率（MVR）的两种程序。 程序A是一种质量测量方法。 程序B是位移测量方法。 通常，材料标准中参照本文件规定了熔体流动速率测量的测试条件。 附件 A 中列出了热塑性塑料通常使用的测试条件。 在比较不同填料含量的材料以及比较填充与未填充的热塑性塑料时，MVR 特别有用。 如果测试温度下的熔体密度已知，则可以通过 MVR 测量来确定 MFR，反之亦然。 本文件也可能适用于在测量过程中流变行为受到水解（断链）、缩合和交联等现象影响的热塑性塑料，但仅限于影响程度有限且重复性和再现性良好的情况下。 都在可以接受的范围之内。 对于在测试过程中表现出显着影响流变行为的材料，本文件不适用。 在这种情况下，ISO 1133-2 适用。 注：这些方法中的剪切速率远小于正常加工条件下使用的剪切速率，因此通过这些方法获得的各种热塑性塑料的数据可能并不总是与它们在加工过程中的行为相关。 这两种方法主要用于质量控制。 [外文原描述]： This document specifies two procedures for the determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastic materials under specified conditions of temperature and load. Procedure A is a mass-measurement method. Procedure B is a displacement-measurement method. Normally, the test conditions for measurement of melt flow rate are specified in the material standard with a reference to this document. The test conditions normally used for thermoplastics are listed in Annex A. The MVR is particularly useful when comparing materials of different filler content and when comparing filled with unfilled thermoplastics. The MFR can be determined from MVR measurements, or vice versa, provided the melt density at the test temperature is known. This document is also possibly applicable to thermoplastics for which the rheological behaviour is affected during the measurement by phenomena such as hydrolysis (chain scission), condensation and cross-linking, but only if the effect is limited in extent and only if the repeatability and reproducibility are within an acceptable range. For materials which show significantly affected rheological behaviour during testing, this document is not appropriate. In such cases, ISO 1133-2 applies. NOTE The rates of shear in these methods are much smaller than those used under normal conditions of processing, and therefore it is possible that data obtained by these methods for various thermoplastics will not always correlate with their behaviour during processing. Both methods are used primarily in quality control.