EN 1890:2006

Surface active agents - Determination of cloud point of non-ionic surface active agents obtained by condensation of ethylene oxide

This document specifies methods for the determination of the cloud point of solutions of non-ionic surface active agents obtained by the reaction of ethylene oxide with a hydrophobic base molecule.
This document primarily applies to surfactants obtained by reaction of ethylene oxide with hydrophobic base molecules, such as fatty alcohols, fatty acids, long-chain alkylphenols, fatty amines, fatty acid esters of sugar derivatives among other ethoxylated non-ionic surfactants, which are by far the most commonly used.
NOTE   Other non-ionic surfactants containing other structural units, such as propylene oxide-ethylene oxide block copolymers, have distinctive behaviours that make the determination of the cloud point more difficult. This leads sometimes to a gradual turbidity over a temperature range of several degrees or even to the occurrence of two cloud points at significantly different temperatures.

Grenzflächenaktive Stoffe - Bestimmung des Trübungspunktes nichtionischer, durch Anlagerung von Ethylenoxid hergestellter grenzflächenaktive Stoffe

Dieses Dokument legt Verfahren zur Bestimmung des Trübungspunktes von Lösungen nicht ionischer
grenzflächenaktiver Stoffe fest, wie sie durch Reaktion von Ethylenoxid mit einem hydrophoben
Ausgangsmolekül erhalten werden.
Dieses Dokument gilt hauptsächlich für grenzflächenaktive Stoffe, wie sie durch Reaktion von Ethylenoxid mit
hydrophoben Ausgangsmolekülen, wie Fettalkoholen, Fettsäuren, langkettigen Alkylphenolen, Fettaminen,
Fettsäureestern von Zuckerderivaten neben anderen ethoxylierten nicht ionischen grenzflächenaktiven
Stoffen erhalten werden, wobei die oben aufgezählten bei weitem am meisten verwendet werden.
ANMERKUNG Andere nicht ionische grenzflächenaktive Stoffe mit anderen strukturellen Einheiten, wie Propylenoxid-
Ethylenoxid-Blockcopolymere, zeigen ein bestimmtes Verhalten, das die Bestimmung des Trübungspunktes schwieriger
macht. Dies führt manchmal zu einer allmählichen Eintrübung über einen Temperaturbereich von mehreren Grad oder
sogar zu zwei Trübungspunkten bei deutlich verschiedenen Temperaturen.

Agents de surface - Détermination du point de trouble des agents de surface non ioniques obtenus par condensation d'oxydes d'éthylène

Le présent document spécifie les méthodes de détermination du point de trouble des solutions d'agents de
surface non ioniques obtenus par réaction de l'oxyde d'éthylène avec un radical hydrophobe.
Le présent document s’applique avant tout aux agents de surface obtenus par réaction de l'oxyde d'éthylène
avec des radicaux hydrophobes, tels que les alcools gras, les acides gras, les alkylphénols à chaîne longue,
les amines grasses, les esters d'acides gras des dérivés du sucre entre autres agents de surface non
ioniques éthoxylés, qui sont de loin les plus couramment utilisés.
NOTE Les agents de surface non ioniques qui contiennent d'autres motifs structuraux, tels que les copolymères
séquencés oxyde de propylène-oxyde d'éthylène, présentent des comportements différents qui rendent plus difficile la
détermination du point de trouble. Ceci se traduit parfois par une turbidité continue sur une plage de températures de
plusieurs degrés ou même par l'apparition de deux points de trouble à des températures significativement différentes.

Površinsko aktivne snovi – Ugotavljanje točke zmotnitve neionskih površinsko aktivnih snovi, pridobljenih s kondenzacijo etilen oksida

General Information

• Status: Published
• Publication Date: 20-Jun-2006
• ICS: 71.100.40 - Surface active agents
• Technical Committee: CEN/TC 276 - Surface active agents
• Drafting Committee: CEN/TC 276/WG 2 - Methods of test
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Completion Date: 31-Oct-2024
• Ref Project: SIST EN 1890:2006 - Surface active agents - Determination of cloud point of non-ionic surface active agents obtained by condensation of ethylene oxide

Relations

• Replaces: EN 1890:1999 - Surface active agents - Determination of cloud point of non-ionic surface active agents obtained by condensation of ethylene oxide
• Effective Date: 22-Dec-2008

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Surface active agents - Determination of cloud point of non-ionic surface active agents obtained by condensation of ethylene oxideAgents de surface - Détermination du point de trouble des agents de surface non ioniques obtenus par condensation d'oxydes d'éthyleneGrenzflächenaktive Stoffe - Bestimmung des Trübungspunktes nichtionischer, durch Anlagerung von Ethylenoxid hergestellter grenzflächenaktive StoffeTa slovenski standard je istoveten z:EN 1890:2006SIST EN 1890:2006en71.100.40ICS:SIST EN 1890:19991DGRPHãþDSLOVENSKI
STANDARDSIST EN 1890:200601-september-2006

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1890June 2006ICS 71.100.40Supersedes EN 1890:1999
English VersionSurface active agents - Determination of cloud point of non-ionicsurface active agents obtained by condensation of ethyleneoxideAgents de surface - Détermination du point de trouble desagents de surface non ioniques obtenus par condensationd'oxydes d'éthylèneGrenzflächenaktive Stoffe - Bestimmung desTrübungspunktes nichtionischer, durch Anlagerung vonEthylenoxid hergestellter grenzflächenaktive StoffeThis European Standard was approved by CEN on 18 May 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1890:2006: E

4 Introduction Solutions of non-ionic surface active agents obtained by the reaction of ethylene oxide with a hydrophobic base molecule, in water or in mixtures of water and organic solvents become turbid at a given temperature as the temperature increases and finally separate into two liquid phases. The process is reversible and the system becomes homogeneous again upon cooling. The temperature at which the solution becomes clear upon cooling is determined as the "cloud point". This temperature is characteristic for a particular surfactant. This temperature increases with the amount of ethylene oxide chemically combined in the surfactant molecule for a given composition of solvents. This phenomenon is not limited to ethoxylated surfactants and the cloud point can be determined also for other non-ionic compounds. The knowledge of the cloud point of non-ionic surfactants obtained by the reaction of ethylene oxide with hydrophobic bases is important for their use. For a given base molecule, the cloud point is indeed a simple measure of the amount of the combined ethylene oxide. Moreover, the cloud point suggests directly the temperature at which many functional surfactant properties change dramatically. The curve of cloud point versus degree of ethoxylation is asymptotic; therefore molecules containing high amounts of ethylene oxide show only small differences in their cloud point. In these cases the cloud point loses its significance.

3 Terms and Definitions For the purposes of this document, the terms and definitions given in EN ISO 862:1995 and the following apply. 3.1 cloud temperature temperature above which aqueous solutions of certain non-ionic surface active agents become heterogeneous by the separation into two liquid phases (coacervation) [EN ISO 862:1995] NOTE 1 The value of the cloud temperature depends on the concentration of the solution. NOTE 2 The temperature at which the system become
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