DIN ISO 2006:2006 pdf free.Synthesekautschuk-Latex -Bestimmung der mechanischen Stabilitat bei hoher Ruhrgeschwindigkeit (ISO 2006:1985)Englische Fassung DIN ISO 2006:2006-04.
1 Scope and field of application
This International Standard specifies a method for the determination of the high-speed mechanical stability of synthetic rubber latex.
The stirring disk which is specified has a greater diameter than that specified for natural rubber latex concentrate in ISO 35, Rubber latex, natural — Determination of mechanical stability.
The test is applicable to synthetic rubber latices which have a viscosity, determined with the L Instrument In accordance with ISO 1652, of up to 200 mPas (200 cP). Latices of higher viscosity shall be tested after dilution to a viscosity of 200 mPa•s (200 cP) or less, provided that such dilution1 does not reduce the concentration of the latex by more than 10 % (rn/rn) total solids.
The duration of stirring shall be so selected that the latex does not increase in temperature to more than 60 °C and does not exceed a height of 100 mm in the latex container. The duration of stirring shall be agreed between the interested parties and shall not be longer than 30 mm or less than 1 mm. In the case of a latex which contains ammonia, the duration of stirring shall be limited, since loss of ammonia by evaporation during the test may cause additional destabilization.
The test does not necessarily indicate the stability of a synthetic rubber latex to high shear stress, for which a rubbing test may be more applicable.
3 Principle
A test portion is stirred at high speed.
The amount of coagulum formed is regarded as an inverse
measure of the mechanical stability of the latex.
4 Reagent
During the analysis, use only distilled water or water of equivalent purity.
Soap solution, 5 % (rn/rn) solution of potassium oleate of pH value 10, or, for use with a latex which is coagulated by potassium oleate solution, 5 % (rn/rn) solution of a synthetic anionic or non-ionic surfactant.
5 Apparatus
Ordinary laboratory apparatus and
5.1 Mechanical stability measuring apparatus2, consisting of the following items:
5.1.1 Latex container, flat-bottomed, cylindrical, at least
100 mm high, with an internal diameter of 58 ± 2 mm and a wall thickness of about 2,5 mm. The inner surface shall be smooth, and a glass container is preferred.DIN ISO 2006 pdf download.