ISO 20844:2004 石油和相关产品-利用柴油注射喷嘴对含油-聚合体的修剪稳定性的测定

标准编号：ISO 20844:2004

中文名称：石油和相关产品-利用柴油注射喷嘴对含油-聚合体的修剪稳定性的测定

英文名称：Petroleum and related products — Determination of the shear stability of polymer-containing oils using a diesel injector nozzle

发布日期：2004-03

标准范围

ISO 20844:2004规定了一种方法，用于评估矿物油、合成油和其他含有聚合物的液体通过指定柴油喷油器喷嘴时的抗剪应力能力。剪切稳定性是通过受试流体的粘度变化来测量的，这是由聚合物在应力过程中的降解引起的。在正常情况下，ISO 20844:2004适用于ISO 6743-4和ISO 11158规定的HR和HV类液压油，但也可适用于火灾-HFA、HFB、HFC和HFD类的耐腐蚀液压油，具有ISO 12922规定的修改条件。使用ISO 20844:2004中描述的程序获得的粘度损失或无粘度损失与实际使用的油和液体之间尚未建立正式的相关性。然而，ISO 20844:2004提供了在最小化热应力和氧化应力下评估聚合物稳定性的标准化条件。它通常被液体和添加剂的制造商以及用户用作对现有和潜在配方进行排序的一种方法。某些规范中规定了粘度以外的特性变化，但ISO 20844:2004中规定的程序不包括这些变化。

ISO 20844:2004 specifies a method to assess the resistance to shear stresses applied to mineral oils, synthetic oils and other fluids containing polymers, when passed through a specified diesel injector nozzle. The shear stability is measured by the change in viscosity of the fluid under test, brought about by the polymer degradation during stress. Under normal circumstances, ISO 20844:2004 is applied to hydraulic fluids of categories HR and HV as defined in ISO 6743-4 and specified in ISO 11158, but it may also be applied to fire-resistant hydraulic fluids within categories HFA, HFB, HFC and HFD, with modified conditions as specified in ISO 12922.No formal correlation has been established between the viscosity loss, or the absence of viscosity loss, obtained using the procedures described in ISO 20844:2004 and that of oils and fluids in actual service. However, ISO 20844:2004 provides standardized conditions for the evaluation of polymer stability under minimized thermal and oxidative stresses. It is normally used by manufacturers of fluids and additives, and users, as a means of ranking existing and potential formulations.Changes to properties other than viscosity are specified in some specifications, but these are not covered by the procedures specified in ISO 20844:2004.

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