1、BSI Standards PublicationBS ISO 23900-4:2015Pigments and extenders Methods of dispersion andassessment of dispersibility inplasticsPart 4: Determination of colouristicproperties and ease of dispersion of whitepigments in polyethylene by two-roll millingBS ISO 23900-4:2015 BRITISH STANDARDNational fo
2、rewordThis British Standard is the UK implementation of ISO 23900-4:2015.The UK participation in its preparation was entrusted to TechnicalCommittee STI/1, Pigments.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to i
3、nclude all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 86264 9ICS 87.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This Br
4、itish Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2015.Amendments issued since publicationDate Text affectedBS ISO 23900-4:2015 ISO 2015Pigments and extenders Methods of dispersion and assessment of dispersibility in plastics Part 4: Determina
5、tion of colouristic properties and ease of dispersion of white pigments in polyethylene by two-roll millingPigments et matires de charge Mthodes de dispersion et valuation de laptitude la dispersion dans les plastiques Partie 4: Dtermination des proprits colorimtriques et de la facilit de dispersion
6、 des pigments blancs dans le polythylne par calandrage sur bicylindreINTERNATIONAL STANDARDISO23900-4First edition2015-05-01Reference numberISO 23900-4:2015(E)BS ISO 23900-4:2015ISO 23900-4:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015All rights reserved. Unless otherwi
7、se specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address bel
8、ow or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 23900-4:2015ISO 23900-4:2015(E)Foreword iv1 Scope . 12 Normative references 13 T
9、erms and definitions . 14 Principle 25 Materials . 25.1 Polyethylene 25.2 Carbon black polyethylene masterbatch 26 Apparatus . 27 Sampling 28 Procedure. 28.1 Testing of colouristic properties in polyethylene in admixture with carbon black . 28.1.1 Preparation of the mixture 28.1.2 Preparation of the
10、 test sample . 38.1.3 Pressing . 38.1.4 Photometric measurement . 38.2 Testing of ease of dispersion . 38.2.1 Preparation of the test samples 38.2.2 Pressing and photometric measurement . 39 Evaluation 310 Test report . 411 Precision . 4 ISO 2015 All rights reserved iiiContents PageBS ISO 23900-4:20
11、15ISO 23900-4:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a s
12、ubject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission
13、(IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should b
14、e noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identif
15、ying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenienc
16、e of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supp
17、lementary information .The committee responsible for this document is ISO/TC 256, Pigments, dyestuffs and extenders.ISO 23900 consists of the following parts, under the general title Pigments and extenders Methods of dispersion and assessment of dispersibility in plastics: Part 1: General introducti
18、on Part 2: Determination of colouristic properties and ease of dispersion in plasticized polyvinyl chloride by two-roll milling Part 3: Determination of colouristic properties and ease of dispersion of black and colour pigments in polyethylene by two-roll milling Part 4: Determination of colouristic
19、 properties and ease of dispersion of white pigments in polyethylene by two-roll milling Part 5: Determination by filter pressure value test Part 6: Determination by film testiv ISO 2015 All rights reservedBS ISO 23900-4:2015Pigments and extenders Methods of dispersion and assessment of dispersibili
20、ty in plastics Part 4: Determination of colouristic properties and ease of dispersion of white pigments in polyethylene by two-roll milling1 ScopeThis part of ISO 23900 specifies a method of determining the colouristic properties of a test pigment in polyethylene (PE) relative to a standard, and the
21、 ease of dispersion DHPEof pigments from the differences in tinting strength of dispersing colouring materials under various conditions.The method is appropriate for use with white pigments.The ease of dispersion determined in this way is valid only for the dispersion equipment, dispersion condition
22、s and dispersion medium being used. The use of test conditions differing from those specified can give different results; this applies both to the absolute magnitude and to the relation between values of the ease of dispersion of various pigments. The subscript DHPEis therefore used to designate the
23、 value obtained as specified in this part of ISO 23900.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest e
24、dition of the referenced document (including any amendments) applies.ISO 787-24:1985, General methods of test for pigments and extenders Part 24: Determination of relative tinting strength of coloured pigments and relative scattering power of white pigments Photometric methodsISO 15528, Paints, varn
25、ishes and raw materials for paints and varnishes SamplingISO 18314-11), Analytical colorimetry Part 1: Practical colour measurement3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1ease of dispersionDHPEmeasure of the rate at which or the degree t
26、o which a pigment or extender achieves a given level of dispersion when dispersed in a plastics materialNote 1 to entry: The DHPEis derived from the increase in tinting strength achieved by two-roll milling as specified in 8.2, relative to the tinting strength achieved as specified in 8.1.1) To be p
27、ublished.INTERNATIONAL STANDARD ISO 23900-4:2015(E) ISO 2015 All rights reserved 1BS ISO 23900-4:2015ISO 23900-4:2015(E)4 PrincipleUsing a two-roll mill, the pigment under test is dispersed at an appropriate temperature in the polymer. The cooled milled sheet obtained in this way is then subjected t
28、o the higher shearing forces resulting from two-roll milling at a narrower gap width. The resulting increase in tinting strength is a measure of the ease of dispersion DHPE.5 Materials5.1 PolyethyleneOf a form, grade and type to be agreed between the interested parties.NOTE Where HDPE is used, a phe
29、nolic antioxidant can be used as a slip agent to facilitate processing.5.2 Carbon black polyethylene masterbatchBased on an easily dispersing type of carbon black as recommended for use in polyethylene.6 Apparatus6.1 Two-roll mill, equipped with heating facilities and having rollers adjustable for s
30、pacing. The roll diameter shall be between 80 mm and 200 mm, and the ratio of the speeds of rotation of the two rollers shall be between 1:1,1 and 1:1,2.NOTE It has been found that comparable results on different two-roll mills can be obtained under the following conditions: ratio of roller diameter
31、s of the two machines: between 1:1 and 1:1,5; ratio of peripheral speeds: between 1:1 and 1:1,1; Hk(bank) to Hs(gap width) such as Hk/Hs 20.If smaller roller sets are used (roller diameter e.g. 80 mm), the settings of the thickness of the milled sheet to 0,4 mm to 0,5 mm with the recommended conditi
32、ons of similarity can lead to difficulties with regard to the requirement for a rolling bank.6.2 Plate press, provided with heating facilities and, preferably, also with cooling facilities.6.3 Photometer.7 SamplingRepresentative samples of the colouring materials to be tested shall be taken as speci
33、fied in ISO 15528.8 Procedure8.1 Testing of colouristic properties in polyethylene in admixture with carbon black8.1.1 Preparation of the mixtureIn a plastic beaker pre-blend gently 100 parts of polyethylene and 0,05 parts carbon black in prepared form (5.2). Add 5 parts of titanium dioxide test pig
34、ment. Mix using a spatula so that no test pigment remains on the beaker walls.2 ISO 2015 All rights reservedBS ISO 23900-4:2015ISO 23900-4:2015(E)The masterbatch should be diluted in the test polymer to facilitate incorporation and handling.A quantity of test mixture based on 100 g polymer is genera
35、lly adequate for most two-roll mills. It may be increased or decreased according to the size of the mill in order to facilitate handling.8.1.2 Preparation of the test sampleThe mixture is added to the rotating rolls of the two-roll mill previously heated to a defined temperature established as being
36、 appropriate for the polymer being used. The ratio of the speeds of rotation of the two rollers shall be between 1:1,1 and 1:1,2.NOTE A temperature between 140 C and 160 C has been found suitable for most types of polymer.A sheet is formed within 1 min in such a way that the whole of the material fo
37、rms a continuous sheet on the front roll. The dispersion of the pigment is obtained by cutting and folding of the sheet every 30 s while milling for a further 7 min at 25 min-1with the gap width maintained at 0,5 mm. After the full 8 min milling the sheet is removed and allowed to cool to room tempe
38、rature, unless photometric measurement is carried out directly on the rotating sheet.After each milling operation the rolls shall be cleaned.8.1.3 PressingSufficiently large pieces are cut out of the sheets prepared from the standard and the test sample and pressed in a spacing frame between polishe
39、d chromed press plates so as to ensure a surface suitable for photometric measurement.NOTE Photometric measurement can also be carried out directly on the rotating sheet.8.1.4 Photometric measurementThe tinting strength of the test specimens prepared as specified in 8.1.2 and 8.1.3 shall be measured
40、 as specified in ISO 18314-1. These values shall be used to determine the tinting strength as specified in ISO 787-24:1985, 8.1 and Clause 9 for the purposes of the calculation.8.2 Testing of ease of dispersion8.2.1 Preparation of the test samplesThe roll gap of the mill is reduced to 0,3 mm and one
41、 half of the sheet prepared under 8.1.2 is returned to the rollers maintained at the same temperature as used in 8.1.2 at 25 min-1. Milling is continued for 7 min with cutting and folding every 30 s. Then the sheet is removed and cooled between metal plates, unless photometric measurement is carried
42、 out directly on the rotating sheet.This procedure is carried out for each sheet containing the test pigments, the rolls being cleaned after each milling operation.8.2.2 Pressing and photometric measurementPressing and photometric measurement are carried out as specified in 8.1.3 and 8.1.4.9 Evaluat
43、ionThe ease of dispersion, DHPE, is expressed as the percentage increase in tinting strength following roll milling at 0,3 mm gap width relative to that obtained following milling at 0,5 mm (see 8.1). ISO 2015 All rights reserved 3BS ISO 23900-4:2015ISO 23900-4:2015(E)It shall be computed from the F
44、 values, using Formula (1):DHPE21=100 1FF(1)whereF1is the tinting strength of the test specimen specified in 8.1;F2is the tinting strength of the test specimen specified in 8.2.10 Test reportThe test report shall contain at least the following information:a) all details necessary to identify the pro
45、duct tested;b) a reference to this part of ISO 23900 (i.e. ISO 23900-4);c) the designation of the test specimens and their preparation, including the temperature of milling;d) the type and concentration of the carbon black pigment in the masterbatch;e) the type, grade and form of the test polymer us
46、ed;f) the photometric data obtained, how obtained and the ease of dispersion, DHPE;g) the method of tinting strength determination;h) any deviation from the test method specified;i) the date of the test.11 PrecisionThis part of ISO 23900 defines the principles of the method and the procedures to be
47、used, but allows variation as regards the dimensions of the machinery used and the type and grade of polyethylene used. Precision data thus cannot be established for the method itself, precision should be determined by repeatability and reproducibility studies according to the equipment and compound
48、 used in the testing laboratory, and according to the pigment under test.4 ISO 2015 All rights reservedBS ISO 23900-4:2015BS ISO 23900-4:2015ISO 23900-4:2015(E) ISO 2015 All rights reservedICS 87.060.10Price based on 4 pagesThis page deliberately left blankBSI is the national body responsible for pr
49、eparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other standardization products are published by BSI Standards Limited.British Standards Institution (BSI)BSI Group Headquarters389 Chiswick High Road London W4 4AL UKAbout usWe bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions.The knowledge embo
