ISO-1658-1994.pdf
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1、INTERNATIONAL STANDARD IS0 1658 Second edition 1994-02-l 5 Natural rubber (NR) - Evaluation procedure Caoutchouc nature1 (NRI - MBthode dkaluation Reference number IS0 1658: 1994(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodi
2、es (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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 organizations
3、, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated
4、 to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 1658 was prepared by Technical Committee lSO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw ma- terials (including
5、latex) for use in the rubber industry. This second edition cancels and replaces the first edition (IS0 1658:1973), plus Amendment 1 :I976 to the first edition, which have been technically revised. Annex A forms an integral part of this International Standard. 0 KS0 1994 All rights reserved. Unless o
6、therwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. international Organization for Standardization Case Postale 56 l Cl-l-121 1 Gen
7、bve 20 l Switzerland Printed in Switzerland ii -,-,- INTERNATIONAL STANDARD 0 IS0 IS0 1658:1994(E) Natural rubber (NR) - Evaluation procedure 1 Scope This International Standard specifies - physical and chemical tests on raw natural rub- bers; - standard materials, standard test formulae, equip- men
8、t and processing methods for evaluating the vulcanization characteristics of natural rubber (NR). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions
9、indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently
10、valid International Standards. IS0 37:-l), Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties. IS0 248:1991, Rubbers, raw - Determination of volatile-matter con tent. IS0 289: 1985, Rubber, unvulcanized - Determination of Mooney viscosity. IS0 471 :I 983, Rubber
11、- Standard temperatures, hu- midities and times for the conditioning and testing of test pieces. IS0 1795:1992, Rubber, raw, natural and synthetic - Sampling and further preparative procedures. IS0 2007:1991, Rubber, unvulcanized - Determi- nation of plasticity - Rapid-plastimeter method. IS0 2393:-
12、Z, Rubber test mixes - Preparation, mixing and vulcanization - Equipment and proce- dures. IS0 3417:1991, Rubber - Measurement of vulcanization characteristics with the oscillating disc curemeter. IS0 6502:1991, Rubber - Measurement of vulcanization characteristics with ro torless curemeters. 3 Samp
13、ling and further preparative procedures 3.1 A laboratory sample of mass approximately 1,5 kg shall be prepared by the method described in IS0 1795. 3.2 Preparation of the test portions shall be in ac- cordance with IS0 1795. 1) To be published. (Revision of IS0 37:1977) 2) To be published. (Revision
14、 of IS0 2393:1973) IS0 1656:1994(E) 0 IS0 4 Physical and chemical tests on raw rubber 4.1 Mooney viscosity b) a black-filled formula for comparative testing of natural rubber for use in black-filled compounds. NOTE 1 Formula b) can also be used for comparative testing of isoprene rubbers (IR). Deter
15、mine the Mooney viscosity in accordance with IS0 289 on a test portion prepared as indicated in 3.2. Record the result as ML (1 + 4) at 100 “C. 5.1 Standard test formulae The standard test formulae are given in table 1. 4.2 Volatile-matter content Determine the volatile-matter content by the oven me
16、thod specified in IS0 248 on a test portion pre- pared as indicated in 3.2. 5 Preparation of the test mix Three formulae are recommended: a) two gum-stock formulae for comparative testing of the vulcanization characteristics of natural rub- ber for use in non-black-filled compounds; The materials sh
17、all be national or international stan- dard reference materials. 5.2 Procedure 5.2.1 Equipment and procedure Equipment and procedure for the preparation, mixing and vulcanizing shall be in accordance with IS0 2393. The surface temperature of the mill rolls shall be maintained at 70 “C + 5 “C through
18、out the mixing. The rubber shall be homogenized in accordance with IS0 1795. I Table 1 - Standard test formulae I Material Natural rubber Zinc oxide Sulfur Stearic acid Oil furnace black (HAF) IRB MBT) TBBS*) Total Number of parts by mass s 3,50 3.50 2,25 0,50 0,50 2,00 - - 35,00 0,50 - - - 0,70 0,7
19、0 110,50 1 IO,70 144,95 I 1) 2-Mercaptobenzothiazole. 2) N-tert-butyl-2-benzothiazole-sulfenamide. This shall be supplied in powder form having an initial ether-insoluble or ethanol-insoluble matter content of less than 0.3 % (m/m). The material shall be stored at room temperature in a closed contai
20、ner and the ether-insoluble or ethanol-insoluble matter shall be checked every 6 months. If this is found to exceed 0,75 % (m/m), the material shall be discarded or recrystallized. 5.2.2 Mixing procedure for formulae 1 and 2 5.2.4 Mixing procedure for formula 3 (black-filled (gum compounds) compound
21、) Duration a) Pass the rubber twice between the rolls without banding, with the mill opening set at 0,2 mm. b) Band the rubber with the mill opening set at 1,4 mm. When a smooth band has been obtained, adjust the mill opening at 1,8 mm. c) Add the zinc oxide, the stearic acid, the sulfur and the MBT
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