BS ISO 23900-5-2015 Pigments and extenders Methods of dispersion and assessment of dispersibility in plastics Determination by filter pressure value test《颜料和填充剂 扩散方法和在塑料中可扩散性的评定 采用.pdf

1、BSI Standards PublicationBS ISO 23900-5:2015Pigments and extenders Methods of dispersion andassessment of dispersibility inplasticsPart 5: Determination by filter pressurevalue testBS ISO 23900-5:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 23900-5:2015

2、.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 include all the necessaryprovisions of a contract. Users are responsible

3、for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 86265 6ICS 87.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy

4、and Strategy Committee on 30 April 2015.Amendments issued since publicationDate Text affectedBS ISO 23900-5:2015 ISO 2015Pigments and extenders Methods of dispersion and assessment of dispersibility in plastics Part 5: Determination by filter pressure value testPigments et matires de charge Mthodes

5、de dispersion et valuation de laptitude la dispersion dans les plastiques Partie 5: Dtermination de la valeur de pression du filtre lors dun essaiINTERNATIONAL STANDARDISO23900-5First edition2015-05-01Reference numberISO 23900-5:2015(E)BS ISO 23900-5:2015ISO 23900-5:2015(E)ii ISO 2015 All rights res

6、ervedCOPYRIGHT PROTECTED DOCUMENT ISO 2015All rights reserved. Unless otherwise 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 writt

7、en permission. Permission can be requested from either ISO at the address below 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 239

8、00-5:2015ISO 23900-5:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Material 15.1 Colour concentrate 15.2 Basic test polymer 25.3 Test mixture . 26 Apparatus . 26.1 General . 26.2 Extruder 26.3 Melt pump . 26.4 Melt pressure transducer . 26.5 Breaker p

9、late 36.6 Filter . 36.6.1 General 36.6.2 Screen-pack 1 36.6.3 Screen-pack 2 36.6.4 Screen-pack 3 36.7 Sealing ring . 37 Preparation of test mixtures 47.1 General . 47.2 Mixture 1 47.3 Mixture 2 48 Procedure. 48.1 Pre-conditioning 48.2 Determination . 49 Evaluation 510 Test report . 611 Precision . 7

10、Annex A (normative) Breaker plate 8Annex B (informative) Example of a test report . 9Bibliography .10 ISO 2015 All rights reserved iiiContents PageBS ISO 23900-5:2015ISO 23900-5:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bo

11、dies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizatio

12、ns, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further

13、 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 be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives)

14、.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 identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introd

15、uction 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 convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to con

16、formity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for this document is ISO/TC 256, Pigments, dyestuffs and extenders.ISO 23900 consists o

17、f the following parts, under the general title Pigments and extenders Methods of dispersion and assessment of dispersibility in plastics: Part 1: General introduction Part 2: Determination of colouristic properties and ease of dispersion in plasticized polyvinyl chloride by two-roll milling Part 3:

18、Determination of colouristic properties and ease of dispersion of black and colour pigments in polyethylene by two-roll milling Part 4: Determination of colouristic properties and ease of dispersion of white pigments in polyethylene by two-roll milling Part 5: Determination by filter pressure value

19、test Part 6: Determination by film testiv ISO 2015 All rights reservedBS ISO 23900-5:2015Pigments and extenders Methods of dispersion and assessment of dispersibility in plastics Part 5: Determination by filter pressure value test1 ScopeThis part of ISO 23900 specifies a method of assessing the degr

20、ee of dispersion of a colorant in a thermoplastic polymer.The method is suitable for testing colorants in the form of colour concentrates in all polymers used for extrusion and melt-spinning processes.The filter pressure value (FPV) determined according to this method is valid only for the equipment

21、, conditions and test polymer being used. The use of test conditions differing from those specified might give different results. The method of preparing the colour concentrate is not specified in this part of ISO 23900. The results obtained for individual colorants are therefore comparable only whe

22、n the same method of preparation for colour concentrates is used.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, th

23、e latest edition of the referenced document (including any amendments) applies.EN 10088-1, Stainless steels Part 1: List of stainless steels3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1filter pressure valueFPVpressure difference between the s

24、tart pressure and the maximum pressure generated by extrusion in front of a screen pack related to the amount of colorant tested4 PrincipleThe test mixture, consisting of a colour concentrate and a basic test polymer, is passed through an extruder fitted with melt pump and screen pack with breaker p

25、late. In front of the screen pack is a melt pressure transducer. The pressure difference between the start pressure and the maximum pressure is used to calculate the filter pressure value (FPV).5 Material5.1 Colour concentrateHomogeneous preparation of a colorant in an appropriate thermoplastic poly

26、mer.INTERNATIONAL STANDARD ISO 23900-5:2015(E) ISO 2015 All rights reserved 1BS ISO 23900-5:2015ISO 23900-5:2015(E)5.2 Basic test polymerThermoplastic polymer, of a grade and type to be agreed between the interested parties.NOTE The development work on this part of ISO 23900 was carried out in polyp

27、ropylene (PP).5.3 Test mixtureA homogeneous mixture of a colour concentrate (5.1) and the basic test polymer (5.2) as specified in Clause 7.6 Apparatus6.1 GeneralFigure 1 illustrates the principle construction of the apparatus (see 6.2 to 6.7).KeyA melt pressure transducer in front of the melt pumpB

28、 melt pressure transducer in front of the filterFigure 1 Apparatus6.2 ExtruderA single screw extruder with non-grooved barrel and a screw without dispersing elements shall be used. A screw with a diameter between 19 mm and 30 mm and with a length of 20 L/D to 30 L/D (length/diameter) is recommended.

29、 It is necessary to have a melt pressure transducer in front of the melt pump (A) to measure the pressure of the melt. An electronic controller with screw speed/pressure feedback loop is necessary in order to maintain this pressure constant, preferably at a level between 30 bar and 60 bar, to ensure

30、 that the melt pump is completely filled and to ensure optimum homogeneity of the melt.6.3 Melt pumpThe melt pump, preferably a metering pump, shall provide a constant throughput of 50 cm3/min to 60 cm3/min.6.4 Melt pressure transducerThe pressure range shall be preferably between 0 bar and 100 bar

31、for mixture 1 (7.2) and between 0 bar and 350 bar for mixture 2 (7.3). The accuracy of the melt pressure transducer (B) shall be within 1 % with a repeatability of less than 0,1 %.The resolution of the pressure measurement should be 0,1 bar.2 ISO 2015 All rights reservedBS ISO 23900-5:2015ISO 23900-

32、5:2015(E)6.5 Breaker plateA breaker plate, as shown in Figure A.1, shall be used to support the screen-pack and defines its free area.6.6 Filter6.6.1 GeneralThe filter media is that part of the system which influences the differential pressure used as the basic data for determining the results of th

33、e test.The differential pressure increase is dependent on the retention characteristics of the filter media.In order to have comparable results it is important that the filter media is defined in detail and assembled exactly to specification.Screen-packs are used as filter media. The screen-pack is

34、assembled from ultrasonically cleaned filter discs, having a filter diameter of 33,8 mm (0,1 mm), in a multi-layer construction, preferably held together in an aluminium frame. All screens shall be made from a suitable material appropriate to the polymer used, e.g. stainless steel in accordance with

35、 EN 10088-1, Type 1.4404. Any change in specification (e.g. weaving pattern, surface condition, number of apertures per unit length or aperture width) can lead to a different test result.6.6.2 Screen-pack 1Two-layer construction, where the first layer is a reverse plain dutch weave 615/108 warp/weft

36、 per 25,4 mm with a wire diameter of 0,042 mm/0,14 mm and the second layer (support mesh) is a square mesh plain weave 0,63 mm aperture width with a wire diameter of 0,40 mm calendered (for further details see ISO 9044).6.6.3 Screen-pack 2Two-layer construction, where the first layer is a reverse pl

37、ain dutch weave 615/132 warp/weft per 25,4 mm with a wire diameter of 0,042 mm/0,13 mm and the second layer (support mesh) is a square mesh plain weave 0,63 mm aperture width with a wire diameter of 0,40 mm calendered (for further details see ISO 9044).6.6.4 Screen-pack 3Three-layer construction, wh

38、ere the first layer is a twilled dutch weave 165/1400 warp/weft per 25,4 mm with a wire diameter of 0,071 mm/0,040 mm and the second layer (support mesh) is a square mesh plain weave 0,25 mm aperture width with a wire diameter of 0,16 mm and the third layer (support mesh) is a square mesh plain weav

39、e 0,63 mm aperture width with a wire diameter of 0,40 mm calendered (for further details see ISO 9044).It is recommended to request confirmation from the supplier that the above specifications are used for the screen-pack. Especially the number of apertures per unit length and the wire diameters of

40、the individual layers are extremely critical for the result of the filter pressure value test.NOTE The use of further finer screen-packs than described in 6.6.2 may be agreed between the interested parties.6.7 Sealing ringThe sealing ring or aluminium frame of the filter disc should have a diameter

41、of 33,8 mm 0,1 mm and an inside diameter of 28 mm 0,1 mm.If the screen-pack has no aluminium frame a sealing ring is to be used. ISO 2015 All rights reserved 3BS ISO 23900-5:2015ISO 23900-5:2015(E)7 Preparation of test mixtures7.1 GeneralThe colour concentrate (5.1) and the basic test polymer (5.2)

42、are mixed together, for example in a glass or plastics container, to provide the homogeneous test mixture.Mixture 1 (7.2) is recommended for colour pigments and mixture 2 (7.3) is recommended for white and carbon black pigments.NOTE 1 The use of other mixtures may be agreed between the interested pa

43、rties.NOTE 2 Colorant quantities below 5,0 g will lead to insufficient accuracy.7.2 Mixture 1A test mixture of 200 g (100 %), including 5,0 g colorant (2,5 %) is used.NOTE If the colour concentrate contains 40 % colorant the quantities are: 12,5 g colour concentrate and 187,5 g basic test polymer.7.

44、3 Mixture 2A test mixture of 1 000 g (100 %), including 80,0 g colorant (8 %) is used.NOTE If the colour concentrate contains 40 % colorant the quantities are: 200 g colour concentrate and 800 g basic test polymer.8 Procedure8.1 Pre-conditioningThe complete apparatus (Clause 6) should be pre-heated

45、to the processing temperature appropriate for the basic test polymer.The equipment should be cleaned or adequately purged with the basic test polymer (5.2) before each test is started.8.2 DeterminationMount a new screen-pack (6.6.2 to 6.6.4) in front of the breaker plate (6.5) and the measuring equi

46、pment in such a way that the melt flows through the finer screen first and through the breaker plate last. A sealing ring (6.7) shall prevent leakage of the mixture around the edge of the screen-pack.Allow sufficient time for the screen-pack and the breaker plate to reach the temperature of the equi

47、pment. This time depends on the equipment being used. The basic test polymer (5.2) is then plasticized in the extruder and passed through the screen-pack with a defined melt volume throughput until the melt temperature and pressure remain constant. The machine conditions should guarantee a constant

48、melt temperature, with temperature deviations of less than 2C.Measure the start pressure psdeveloped by the basic test polymer directly in front of the screen-pack. The start pressure psshould be constant. When the hopper is empty and the extruder screw is just visible, add the test mixture (5.3).NO

49、TE A pressure drop can occur because of different rheological properties of basic test polymer and test mixture.After feeding of the test mixture is completed, 100 g basic test polymer are added just as the extruder screw becomes visible again.4 ISO 2015 All rights reservedBS ISO 23900-5:2015ISO 23900-5:2015(E)The test is finished as soon as the extruder screw once again becomes visible. Use the recorded data to evaluate the maximum pressure pmaxand to calculate the filter pressure value.Remove the screen-pack while s