1、BSI Standards PublicationBS ISO 5794-2:2014Rubber compoundingingredients Silica,precipitated, hydratedPart 2: Evaluation procedures in styrene-butadiene rubberBS ISO 5794-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 5794-2:2014. It supersedes BS 6449-
2、2:1984 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/23, Test methods for rubber and non-black com-pounding ingredients.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not pu
3、rport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 85476 7 ICS 83.040.20 Compliance with a British Standard cannot confer immunity from legal obli
4、gations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2014.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e d ISO 2015Rubber compounding ingredients Silica, precipitated, hydrated Part 2: Evaluation proce
5、dures in styrene-butadiene rubberIngrdients de mlange du caoutchouc Silices hydrates prcipites Partie 2: Mthodes dvaluation dans le caoutchouc styrne-butadineINTERNATIONAL STANDARDISO 5794-2Third edition 2014-12-01Reference number ISO 5794-2:2015(E)BS ISO 5794-2:2014ISO 5794-2:2015(E)ii ISO 2015 All
6、 rights reservedCOPYRIGHT 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
7、prior written 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 Switzerlan
8、dBS ISO 5794-2:2014ISO 5794-2:2015(E)Contents PageForeword iv1 Scope . 12 Normative references 13 Sampling 14 Test formulations . 25 Procedure. 25.1 Equipment and procedure 25.2 Mill mixing procedure . 25.3 Testing of the uncured mix . 36 Evaluation of vulcanization characteristics . 36.1 Evaluation
9、 according to oscillating disc curemeter test 36.2 Evaluation according to rotorless curemeter test 46.3 Evaluation according to stress-strain properties 46.4 Hardness . 47 Precision . 48 Test report . 4Bibliography 5 ISO 2015 All rights reserved iiiBS ISO 5794-2:2014ISO 5794-2:2015(E)ForewordISO (t
10、he 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 subject for which a technical commit
11、tee 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 (IEC) on all matters of electrotech
12、nical 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 be noted. This document was drafted
13、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 identifying any or all such patent rights.
14、 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 convenience of users and does not constitute
15、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 - Supplementary information.The committe
16、e responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.This third edition cancels and replaces the second edition (ISO 5794-2:1998), which has been technically revised with the following changes: ISO
17、 5794-3 is now mentioned in the scope; normative references have been updated; those standards which refer to the ingredients of the standard test formulations have been moved to the new section “Bibliography”; footnote 1 in Table 1 has been deleted because SBR 1500 EST is no longer available.ISO 57
18、94 consists of the following parts, under the general title Rubber compounding ingredients Silica, precipitated, hydrated: Part 1: Non-rubber tests Part 2: Evaluation procedures in styrene-butadiene rubber Part 3: Evaluation procedures in a blend of solution styrene-butadiene rubber (S-SBR) and buta
19、diene rubber (BR)iv ISO 2015 All rights reservedBS ISO 5794-2:2014Rubber compounding ingredients Silica, precipitated, hydrated Part 2: Evaluation procedures in styrene-butadiene rubberWARNING Persons using this part of ISO 5794 should be familiar with normal laboratory practice. This International
20、Standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.1 ScopeThis part of ISO 5794 specifies the test
21、 formulation, equipment, procedure, and test methods for determining the physical properties of precipitated hydrated silica in a styrene-butadiene rubber mix.ISO 5794-1 describes methods for chemical analysis of precipitated hydrated silica, describes its physical and chemical properties, and class
22、ifies silica with respect to their specific surface area obtained by nitrogen adsorption.ISO 5794-3 specifies the test formulation, equipment, procedure, and test methods for determining the physical properties of precipitated hydrated silica in a compound based on a blend of solution styrene-butadi
23、ene rubber and butadiene rubber.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 edition of the reference
24、d document (including any amendments) applies.ISO 37, Rubber, vulcanized or thermoplastic Determination of tensile stress-strain propertiesISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD)ISO 289-1, Rubber, unvulcanized Determinations using
25、 a shearing-disc viscometer Part 1: Determination of Mooney viscosityISO 2393, Rubber test mixes Preparation, mixing and vulcanization Equipment and proceduresISO 3417, Rubber Measurement of vulcanization characteristics with the oscillating disc curemeterISO 6502, Rubber Guide to the use of curemet
26、ersISO 15528, Paints, varnishes and raw materials for paints and varnishes SamplingISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods3 SamplingThe sampling shall be carried out in accordance with ISO 15528.INTERNATIONAL STANDARD ISO 5794-2:2015(
27、E) ISO 2015 All rights reserved 1BS ISO 5794-2:2014ISO 5794-2:2015(E)4 Test formulationsTwo standard formulations are given in Table 1, differing in the amount of activator.Silica with high specific surface area requires more activator than silica with lower specific surface area. International or n
28、ational standard chemicals shall be used, if available. Materials used shall be chemically identical with those indicated in Table 1.Table 1 Standard test formulationsMaterial Formulation1Parts by mass2Parts by massSBR 1500 100 100Silica (type A, B, C, D) 50 Silica (type E, F) 50Zinc oxidea5 5Steari
29、c acidb1 1PEG 4000c3 1,5MBTS 1,2 1,2MBT 0,7 0,7DPG 0,5 0,5Sulfurd2 2Total 163,4 161,9aISO 9298:1995, Table D.1, class B1a.bISO 8312:1999, Table L.1, class A, very low iodine value.cPoly(ethylene glycol) (relative molecular mass 4 000).dISO 8332:2011, Table A.1, grade W.5 Procedure5.1 Equipment and p
30、rocedureEquipment and procedure for preparation, mixing, and vulcanization shall be in accordance with ISO 2393.5.2 Mill mixing procedureThe standard laboratory mill batch mass, in grams, shall be based on four times the test formulation mass. The surface temperature of the rolls shall commence at 2
31、5 C 5 C with proper cooling. The mass of the mixed batch shall not differ from the total mass of materials by more than +0,5 % or -1,5 %.2 ISO 2015 All rights reservedBS ISO 5794-2:2014ISO 5794-2:2015(E)Time minCumulative time min5.2.1 Band the rubber with the mill opening set at 1 mm. Add zinc oxid
32、e and stearic acid. Make 3/4 cuts every 30 s from alternate sides.3 35.2.2 Add 1/3 of the silica and make two 3/4 cuts from each side. 5 85.2.3 Add 1/3 of the silica and make two 3/4 cuts from each side. 5 135.2.4 Add 1/3 of the silica and the activator. Make two 3/4 cuts from each side6 195.2.5 Add
33、 sulfur and accelerator slowly and evenly across the rubber. When all substances have been incorporated, make two 3/4 cuts from each side.3 225.2.6 Cut the batch from the mill, set the mill opening to 0,8 mm to 1 mm nip and pass the rolled batch three times endwise through the rolls.1,5 23,55.2.7 Cu
34、t the batch from the mill, set the mill opening to 3 mm to 3,5 mm nip and pass the rolled batch three times endwise through the rolls.1,5 25Total time: 255.2.8 From the freshly prepared batch form, one 6 mm sheet for samples for the determination of vulcanization characteristics and one 2,2 mm sheet
35、 for the preparation of tensile test pieces.5.2.9 Condition the batch for 18 h to 24 h before vulcanization, if possible, at standard temperature and humidity as defined in ISO 23529.5.3 Testing of the uncured mixDetermine the viscosity at 100 C using the shearing disc viscometer in accordance with
36、ISO 289-1.6 Evaluation of vulcanization characteristics6.1 Evaluation according to oscillating disc curemeter testMeasure the following standard test parameters in accordance with ISO 3417:ML, MH, ts1, tc(50) and tc(90)using the following test conditions: oscillation frequency: 1,7 Hz (100 cycles pe
37、r minute); amplitude of oscillation: 3 arc (1 arc may be used, if required); selectivity: to be chosen to give at least 75 % full scale deflection at MH; die temperature: 160 C; pre-heat time: none. ISO 2015 All rights reserved 3BS ISO 5794-2:2014ISO 5794-2:2015(E)6.2 Evaluation according to rotorle
38、ss curemeter testMeasure the following standard test parameters in accordance with ISO 6502:FL, Fmaxat a specified time, t s1, tc(50) and tc(90)using the following test conditions: oscillation frequency: 1,7 Hz (100 cycles per minute); amplitude of oscillation: 0,5 arc; selectivity: to be chosen to
39、give at least 75 % full scale deflection at Fmax; die temperature: 160 C; pre-heat time: none.6.3 Evaluation according to stress-strain propertiesVulcanize the test slabs at 160 C for 15 min.Determine the tensile stress-strain properties stress at 300 % strain, stress at 500 % strain (if elongation
40、at break exceeds 600 %), tensile strength, and elongation at break in accordance with ISO 37 using type 2 test pieces.6.4 HardnessDetermine the hardness in accordance with ISO 48.7 PrecisionThe test precision may vary depending on the type of silica and on the rubber properties determined.8 Test rep
41、ortThe test report shall include the following information:a) a reference to this part of ISO 5794, i.e. ISO 5794:2014;b) all details necessary for the identification of the sample;c) standard test formulation used (1 or 2);d) viscosity of the uncured mix (see 5.3);e) cure characteristics (see 6.1 o
42、r 6.2);f) stress-strain properties (see 6.3);g) hardness (see 6.4);h) any operations not included in this part of ISO 5794 or in the International Standards to which reference is made, as well as any operation regarded as optional;i) date of the test.4 ISO 2015 All rights reservedBS ISO 5794-2:2014I
43、SO 5794-2:2015(E)Bibliography1 ISO 5794-1:2010, Rubber compounding ingredients Silica, precipitated, hydrated Part 1: Non-rubber tests2 ISO 8312:1999, Rubber compounding ingredients Stearic acid Definition and test methods3 ISO 8332:2011, Rubber compounding ingredients Sulfur Methods of test4 ISO 92
44、98:1995, Rubber compounding ingredients Zinc oxide Test methods ISO 2015 All rights reserved 5BS ISO 5794-2:2014ISO 5794-2:2015(E) ISO 2015 All rights reservedICS 83.040.20Price based on 5 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and
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