ISO 2555:2018 プラスチック—液体状態またはエマルジョンまたは分散液としての樹脂—単気筒タイプの回転粘度計法を使用した見かけの粘度の測定 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical properties.

This third edition cancels and replaces the second edition (ISO 2555:1989), which has been technically revised. The main changes compared to the previous edition are as follows:

• a) the name of the equipment has been changed to “single cylinder type rotational viscometer” and the method of determination of viscosity is described with more general terms to avoid reference to specific brand names;
• b) the commercially available main models and spindles have been summarized;
• c) digital type viscometer has been added;
• d) the accuracy of test method has been added;
• e) the calibration method has been added.

Introduction

A rotational viscometer is composed of a spindle, a torque measuring device and a spring. There are three types of rotational viscometers with regard to difference of the spindle:

• a) single cylinder type (used in this document, i.e. ISO 2555);
• b) coaxial cylinder type (used in ISO 3219 ^[2]);
• c) cone-plate type (used in ISO 3219 ^[2]).

Single cylinder type rotational viscometers measure viscosity under non-constant shear rate. Coaxial cylinder type and cone-plate type instruments measure viscosity under constant shear rate.

When using a single cylinder type instrument, the measured viscosity is relative to measuring conditions. Conditions are therefore intended to be specified for viscosity measurements.

For Newtonian fluids, the viscosity value remains the same even if different viscosity measuring methods from this document and ISO 3219 are used.

With non-Newtonian fluids the measured viscosity changes depending on shear rate. The viscosity determined using different measuring methods such as methods from this document and ISO 3219 therefore may differ from each other, depending on shear rates used during measurements.

The Brookfield method has contributed a lot to determination of liquid viscosity. With its simple measuring low-cost equipment, the principles underlying the Brookfield technique still remain an important element in determination of viscosity of liquids.

This document is largely based on the Brookfield method established in 1989. However, some of the instruments mentioned in the previous edition of this document have long been discontinued. Moreover, although analogue (or the so-called “dial”) type was the predominant viscometer type at that time, the use has now shifted to digital viscometers in the recent years, increasing the need for this document to be revised.

The terms and standards introduced in this new edition are based on ISO 1652 ^[1].

Currently, digital viscometer has become the mainstream. However, analogue (or dial) viscometer is still used and cannot be removed from the method. This document allows the use of both analogue (or dial) viscometer and digital viscometer.

1 Scope

This document specifies a method of determining apparent viscosity of resins in a liquid state using a single cylinder type rotational viscometer.

The method can be used for viscosity measurements in the range from 0,02 Pa ⋅ s to 60 000 Pa ⋅ s.

This document is applicable to both Newtonian and non-Newtonian liquids and the measured apparent viscosity depends on the velocity gradient to which the liquids are subjected during the measurement.

2 Normative references

There are no normative references in this document.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography