1、Surface active agents Determination of wetting power by immersion (IS0 8022 : 1990, modified) English version of DIN EN 1772 ICs 71.1 00.40 DIN EN 1772 - Supersedes September 1995 edition. Grenzflchenaktive Stoffe - Bestimmung des Tauchnetzvermgens (IS0 8022 : 1990, modifiziert) European Standard EN
2、 1772 : 2000 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been prepared by CEN/TC 276 Surface active agents (Secretariat: France). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials
3、 Testing Standards Committee), Technical Committee Anwendungstechnische Verfahren fr Tenside. DIN IS0 607 is the standard corresponding to International Standard IS0 607 referred to in clause 2 of the EN. Amendments This standard differs from the September 1995 edition in that it has been editoriall
4、y revised and sodium bis (2-ethylhexyl) sulfosuccinate has been substituted for sodium di-n-hexylsulfosuccinate and sodium di-n-heptylsulfosuccinate. Previous editions DIN 53901: 1954-07, 1976-01; DIN IS0 8022: 1989-09. EN comprises 11 pages. 4 No pari of this standard may be reproduced without the
5、prior permission of )IN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, lac the exclusive right of sale for German Standards (DIN-Normen). Ref. No. DIN EN 1772 : 2000- Sales No. 1 1: English price group 08 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 17
6、72 March 2000 ICs 71.1 00.40 Supersedes EN 1772 : 1995. English version Surface active agents Determination of wetting power by immersion (IS0 8022 : 1990, modified) Agents de surface - Dtermination du pouvoir mouillant par immersion (IS0 8022 : 1990 modifi) Grenzflchenaktive Stoffe - Bestim- mung d
7、es Tauchnetzvermgens (IS0 8022 : 1990, modifiziert) This European Standard was approved by CEN on 2000-02-18. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any altera
8、tion. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translat
9、ion under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland,
10、 Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 8-1050 Brussels O 2000. CEN - All rights of exp
11、loitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 1772 : 2000 E Page 2 EN 1772 : 2000 Contents Page Foreword Introduction . 1 2 3 4 5 6 7 8 8.1 8.2 8.3 8.4 8.5 8.6 8.7 9 10 scope Normative references Term and definition Principle Reagents and products .
12、Apparatus . Sampling . Procedure . Test portion Preparation of the surface active agent solution . Preparation of the discs of cotton control cloth . Cleaning the apparatus . Filling the measurement beaker . Determination (see figure 3) . Calibration of the cloth Expression of results 3 3 4 4 4 4 5
13、5 8 8 8 8 8 8 9 9 9 9 Test report 10 Annex A (informative) Commercially available control cloths 11 Bibliography 11 Page 3 EN 1772 : 2000 Foreword The text of the International Standard from Technical Committee ISOTTC 91 “Surface active agents“ of the International Organization for Standardization (
14、ISO) has been taken over as an European Standard by Technical Committee CENTTC 276 “Surface active agents“, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest
15、by September 2000, and conflicting national standards shall be withdrawn at the latest by September 2000. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic,
16、 Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This European Standard replaces EN 1772:1995. Annex A is informative. Endorsement notice The text of the International Standard IS0 8022:
17、1990 has been approved by CEN as a European Standard with the following modifications as given below. Punch of diameter 30 mm, carefully degreased using a volatile solvent. NOTE The following solvents may be used : - acetone ; - hexane : - hexane/acetone mixture, 50 % ( V7V) ; - ethanol ; - acetone/
18、ethanol mixture, 50 % (V7V) ; - distilled water (in some cases). The standard product has been modified : sodium di-nhexylsulfosuccinate and sodium di-nheptylsulfocuccinate have been replaced by sodium bis (2-ethylhexyl) sulfosuccinate. Introduction In many textile operations, for example softening
19、or washing textiles, as well as in the rinsing or the cleaning of hard surfaces - in short in all processes in which a phase (air, oil or soil) has to be replaced by a liquid phase (aqueous or organic) - it is useful to know the wetting agents used. It is also important to know after how long comple
20、te wetting is obtained. Page 4 EN 1772 : 2000 1 Scope This European standard specifies a method for determining the wetting power of a surface active agent in solution by immersion of a disc of raw cotton cloth in the solution. The method is applicable to all curface active agents, whatever their io
21、nic character, used as wetting agents in neutral, slightly acid or slightly basic baths for textile applications. The method is not applicable to mercerizing assistants (baths highly basic) or to carbonising assistants (baths highly acid). 2 Normative references This European standard incorporates b
22、y dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the pubtications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Stan
23、dard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 201 39, Textiles - Standard atmospheres for conditioning and testing (IS0 139: 1973). IS0 607, Surface active agents and detergents - Methods of sample div
24、ision. IS0 2456, Surface active agents - Water used as a solvent for tests - Specification and fest methods. IS0 381 9, Laborafotyglassware - Beakers. 3 Term and definition For the purposes of this standard, the following term and definition apply : 3.1 wetting power (by immersion) degree of ability
25、 of a solution of surface active agent to displace the air trapped in a cloth when the cloth is steeped in the solution NOTE The wetting power of a surface active agent can be evaluated by examination of plos of wetting time of discs of raw cotton cloth immersed in solutions of surface active agents
26、 or solutions of standard wetting agents of known concentration, against concentration. 4 Principle Immersion, while held in a gripper, of a cotton disc of known nature and characteristics, in a solution of surface active agent of known concentration ; maintenance of complete submersion in the solut
27、ion, by means of the specially designed gripper, of the cotton disc, which tends to float to the surface due to air trapped in the cloth. After displacement of air and penetration of the solution into the cloth, the cotton disc starts to sink. Determination of the wetting time by measuring the inter
28、val between the moment of immersion of the cotton disc and the moment when it begins to sink. Determination of the wetting time using a standard solution at five concentrations, and then using the surface active agent solution under test, also at five different concentrations. After plotting the two
29、 “wetting time/concentration“ curves, determination of the wetting power of the surface active agent under test by comparison of the position of its curve with the standard curve. Page 5 EN 1772 : 2000 5 Reagents and products 5.1 Distilled water, or water of equivalent purity, complying with the spe
30、cifications of IS0 2456. NOTE Other grades of water can be used provided details are noted in the test report. 5.2 Sodium bis (2-ethylhexyl) sulfosuccinate, of recognised analytical grade (purity 2 98 %). 5.3 Raw cotton control cloth, of known nature and characteristics, conditioned in the standard
31、temperate atmosphere specified in EN 20139, .e. a relative humidity of 65 % and a temperature of 20 OC. (Various types of commercially available control cloths are described in annex A). 6 Apparatus Ordinary laboratory apparatus and, in particular : 6.1 Beaker, low form, of capacity 1 O00 ml, comply
32、ing with the specifications of IS0 3819. 6.2 Cloth-immersion gripper, made of stainless-steel wire of about 2 mm diameter and whose dimensions are given in figure 1 (see also the photo, figure 2, which shows an example of a gripper constructed in accordance with figure 1, with three support arms pro
33、jecting at right angles from the gripper body). These arms can be mounted on a sliding collar as shown in figure 1. It is important that the design of the gripper is such that, when a raw cotton disc held in the gripper is immersed in 700 ml of test solution in the 1 O00 ml beaker (6.1), the cotton
34、disc is held about 40 mm below the surface of the solution. It is also important that the gripper tips only open about 6 mm so that the cotton disc remains nearly vertical in the solution. 6.3 Punch, of diameter 30 mm, carefully degreased using a volatile solvent. NOTE The following solvents can be
35、used : - acetone - hexane ; - hexanelacetone mixture, 50 YO (VN) ; - ethanol - acetone/ethanol mixture, 50 YO (VN) ; - distilled water (in some cases). 6.4 Stopwatch, accurate to 0,l s. Page 6 EN 1772 : 2000 Dimensions in millimetres Figure 1 - Cloth-immersion gripper Figure 2 - Photo showing exampl
36、e of gripper constructed in accordance with the requirements specified in 6.2 2 1 Page 7 EN 1772 : 2000 Figure 3 - Illustration of procedure 10 100 1 1000 10000 1 Wetting time in seconds 2 Concentration in grams per litre Figure 4 - “Wetting timdconcentration” curves for surface active agents A, B a
37、nd C, with standard curve for comparison Page 8 EN 1772 : 2000 7 Sampling The surface active agent laboratory sample shall be prepared and stored in accordance with IS0 607. 8 Procedure 8.1 Test portion Weigh, to the nearest 0,05 g, 5 g of the laboratory sample into a 100 ml beaker. 8.2 Preparation
38、of the surface active agent solution Dissolve the test portion (8.1) in water (5.1), if necessary after first making a paste of the surface active agent with water warmed to 40 OC, then diluting with water at about 20 OC. Transfer quantitatively to a 1 O00 ml volumetric flask, make up to the mark wi
39、th water and mix. Take 200 ml of the solution thus obtained, transfer to a 1 O00 ml volumetric flask, make up to the mark with water and mix. If the Krafft-temperature of the surface active agent is higher than 40 OC, make the paste and carry out the dissolution at a temperature at least equal to th
40、e Kram temperature. Keep the solution at (20 f 2) OC until the beginning of the test. Prepare the solution not less than 15 min, but not more than 2 h, before the measurement. NOTE assistants) can be chosen provided that they are noted in the test report. Conditions other than those given above (con
41、cerning the hardness or pH of the water, temperature, possible 8.3 Preparation of the discs of cotton control cloth Using the punch (6.3), cut out discs of 30 mm diameter from the raw cotton cloth (5.3). It is very important to avoid touching the cloth with the fingers as the presence of fatty mater
42、ials or perspiration on the surface of the cloth can affect the results. 8.4 Cleaning the apparatus The success of the tests depends, to a certain extent, on the cleanness of the apparatus. Before the test, and if possible overnight, leave a chromic/sulfuric acid mixture) , prepared by gently stirri
43、ng sulfuric acid (p20 = 1,84 g/ml) into an equal volume of a saturated solution of potassium dichromate, to stand in the beaker (6.1). Then rinse the beaker with water (5.1) until all traces of acid have disappeared, finally rinsing with a small quantity of the solution under test. Clean the gripper
44、 (6.2) using a volatile solvent, dry, then rinse with a small quantity of the solution under test. For a particular surface active agent under test, the apparatus is only rinsed between measurements with the solution at a new concentration. l) Other cleaning solutions can be used provided that they
45、are noted in the test report Page 9 EN 1772 : 2000 8.5 Filling the measurement beaker Using a measuring cylinder, introduce 700 ml of the test solution prepared in 8.2 into the measurement beaker (6.1). During these operations, in order to avoid the formation of undesirable foam, it is recommended t
46、hat the test solution be allowed to flow down the internal walls of the vessels. If necessary, remove any foam formed on the surface of the solution in the measurement beaker with a filter paper. 8.6 Determination (see figure 3) Measure, to the nearest 1 “C, the temperature of the solution. Clamp a
47、raw cotton disc (8.3) in the gripper (6.2). Immerse the disc in the solution, starting the stopwatch (6.4) at the moment when the lower part of the disc touches the solution. Rest the support arms on the rim of the beaker and allow the gripper to open. Stop to stopwatch when the disc begins to sink
48、of its own accord. In the case of solutions at high temperatures, it is important to wait at least 15 min after stabilisation of the temperature before carrying out the measurement. If the wetting time for the first test solution (concentration 1 g/I) is not about 300 s, adjust the mass of the test
49、portion correspondingly and repeat the procedure until the test solution concentration has been found which gives a wetting time of about 300 s. When this test solution concentration has been found, repeat the measurement nine times on this solution, but taking a fresh cotton disc for each measurement. Calculate the arithmetic mean of the 10 measurements and record this as the wetting time for that particular test solution concentration. Prepare, in the same way as for the first test solution, four further solutions of increasing concentration and determine the wetting time
