1、BRITISH STANDARD BS 5293-20: 1992 ISO 3257:1992 Sampling and testing carbon black for use in the rubber industry Part 20: Method for evaluation in styrene-butadiene rubbers UDC 667.621.6:543.813BS5293-20:1992 This British Standard, having been prepared under the directionof the Plastics and Rubber S
2、tandards Policy Committee, was published underthe authority of the Standards Board and comes intoeffect on 15December1992 BSI08-1999 The following BSI references relate to the work on this standard: Committee reference PRM/53 Draft for comment92/41627 DC ISBN 0 580 21453 2 Committees responsible for
3、 this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/53, upon which the following body was represented: British Rubber Manufacturers Association Amendments issued since publication Amd.
4、No. Date CommentsBS5293-20:1992 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Preparation of test mixes for evaluation of carbon black instyrene-butadiene rubbers 1 4 Evaluation of vulcanization characteristics by the
5、oscillating disccuremeter test 2 5 Evaluation of tensile stress-strain properties of vulcanized test mixes 2 6 Test report 2 Table 1 Standard test formula for evaluation of carbon black in butadiene-styrene rubbers 2 List of references Inside back coverBS5293-20:1992 ii BSI 08-1999 National foreword
6、 This Part of BS5293has been prepared under the direction of the Plastics and Rubber Standards Policy Committee and is identical with ISO3257:1992 Rubber compounding ingredients Carbon black Method of evaluation in styrene-butadiene rubbers, published by the International Organization for Standardiz
7、ation (ISO). This Part of BS5293is a part of a revision of BS5293:1976as a multipart standard, parts of which are identical with ISO standards. The first edition of BS5293published in1976did not include a method to evaluate carbon black in styrene-butadiene rubbers. The Technical Committee has revie
8、wed the provisions of ISO37:1977, ISO289:1985and ISO2393:1973, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to ISO289is BS903-A58:1990 Methods using the Mooney viscometer. A British St
9、andard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding
10、 British Standard BS 903 Physical testing of rubber ISO 471:1983 Part A35:1985 Temperatures, humidities and times for conditioning and testing of test pieces (Identical) ISO 3417:1991 Part A60 Curemetering Section 60.2:1992 Method for the determination of vulcanization characteristics using an oscil
11、lating disc curemeter. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendm
12、ent table on the inside front cover.BS5293-20:1992 BSI 08-1999 1 1 Scope This International Standard specifies standard materials, equipment and processing methods for evaluating carbon black in styrene-butadiene rubbers (SBR). NOTE 1Variations in equipment and testing procedure permitted in this In
13、ternational Standard can lead to discrepant results. Therefore, carbon black is preferably compared to a reference carbon black tested under the same conditions. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this Int
14、ernational Standard. At the time of publication, the editions 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 recent editions of the standards indicated belo
15、w. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 37:1977, Rubber, vulcanized Determination of tensile stress-strain properties. ISO 289:1985, Rubber, unvulcanized Determination of Mooney viscosity. ISO 471:1983, Rubber Standard temperatures, humidities and
16、 times for the conditioning and testing of test pieces. ISO 2393:1973, Rubber test mixes Preparation, mixing and vulcanization Equipment and procedures. ISO 3417:1991, Rubber Measurement of vulcanization characteristics with the oscillating disc curemeter. 3 Preparation of test mixes for evaluation
17、of carbon black in styrene-butadiene rubbers 3.1 Standard test formula The standard test formula is given in Table 1. The materials shall be NIST 1)standard reference materials as indicated in Table 1, or shall be in accordance with equivalent national or International Standards. 3.2 Procedure 3.2.1
18、 Equipment and procedure Equipment and procedure for preparation, mixing and vulcanization shall be in accordance with ISO2393. 3.2.2 Mill mixing procedure The standard laboratory mill batch mass, in grams, shall be based on four times the formula mass (seeTable 1). The surface temperature of the ro
19、lls shall be maintained at50 C 5 C throughout the mixing. All mill openings shall be adjusted to maintain a good rolling bank at the nip of the rolls during mixing. 1) National Institute of Standards and Technology (formerly the National Bureau of Standards) of the USA. Duration Cumulative time (min
20、) (min) a) Band the rubber with the mill opening set at1,1 mm, and make3/4cuts every30s from alternate sides 2 2 b) Add the sulfur slowly and evenly across the rubber . 2 4 c) Add the stearic acid. Make one3/4cut from each side 2 6 d) Add carbon black evenly across the mill at a uniform rate. When a
21、bout half the black has been incorporated, open the mill to1,4mm and make one3/4cut from each side. Then add the remainder of the carbon black. When all the black has been incorporated, open the mill to1,8mm and make one3/4cut from each side. Be certain to add the black that has dropped into the mil
22、l pan 10 16 e) Add the zinc oxide and the TBBS with the mill opening at1,8mm 3 19 f) Make three3/4cuts from each side 3 22BS5293-20:1992 2 BSI 08-1999 Table 1 Standard test formula for evaluation of carbon black in butadiene-styrene rubbers 4 Evaluation of vulcanization characteristics by the oscill
23、ating disc curemeter test Measure the following standard test parameters: M L , M H(at defined time), t s1 , t c (50) and t c (90) in accordance with ISO 3417, using the following test conditions: If macro-dies are used, a pre-heat time of1min is necessary. 5 Evaluation of tensile stress-strain prop
24、erties of vulcanized test mixes Vulcanize sheets at145 C for two (or, preferably, three) periods selected from a cure series of25min,35min, 50min and75min, depending on the characteristics of the carbon black under test. NOTE 2Alternatively, vulcanize sheets at150 C for two (or, preferably, three) p
25、eriods selected from a cure series of20min,25min, 30min, 35min and50min, depending on the characteristics of the carbon black under test. These conditions will give results that differ from those obtained with the standard vulcanization conditions. Condition the vulcanized test slabs for16h to72h at
26、 a standard temperature (see ISO471). Measure the stress-strain properties in accordance with ISO37. 6 Test report The test report shall include the following: a) a reference to this International Standard: b) all details necessary for the identification of the sample; c) the reference materials use
27、d, including the Mooney viscosity of the SBR; d) the vulcanizing temperature and times used in clause5; e) any unusual features noted during the determination; f) any operation not included in this International Standard or in the International Standards to which reference is made, as well as any op
28、eration regarded as optional; g) the results and the units in which they have been expressed; h) the date of the test. g) Cut the batch from the mill. Set the mill opening to0,8mm and pass the rolled batch endwise through the rolls six times 2 24 Total time 24 h) Sheet the batch to approximately6mm
29、and check-weigh the batch. If the mass of the batch differs from the theoretical value by more than0,5%, discard the batch and re-mix. Remove sufficient material for oscillating disc curemeter testing. i) Sheet the batch to approximately2,2mm for preparing test slabs or to the appropriate thickness
30、for preparing ISO ring test pieces and other test specimens. j) Condition the batch for2h to24h, after mixing and prior to vulcanizing, at a standard temperature (see ISO471). Material NIST standard reference material number Parts by mass SBR 1500 a 386 100,00 Zinc oxide 370 3,00 Sulfur 371 1,75 Ste
31、aric acid 372 1,00 Carbon black (except N700series) b 50,00 TBBS c 384 1,00 Total 156,75 a A European equivalent to NIST standard reference material386has been developed to match by Erichem Elastomeri SpA. This EST (European Standard Type) rubber is an SBR1500type using a rosin acid emulsifier and a
32、 staining stabilizer. The Mooney viscosity ML (1 + 4) at100 C, determined in accordance with ISO289, of this standard reference material shall have limits of 1Mooney unit within the absolute range of48to52, but with the preferred viscosity of50to51. b If N700series carbon black is used, the number o
33、f parts by mass shall be80,00, making a total parts by mass of186,75. The carbon black shall be dried for30min at105 C or125 C and cooled to room temperature in a dessicator prior to use. c N-tert-butylbenzothiazole-2-sulfenamide. This shall be supplied in powder form, with an initial ether- or etha
34、nol-insoluble-matter content of less than0,3% (m/m). The material shall be stored at room temperature in a closed container and the ether- or ethanol-insoluble-matter content shall be checked every6months. If this is found to exceed0,75% (m/m), the material shall be discarded or re-crystallized. osc
35、illation frequency: 1,7 Hz (100 cycles per minute) amplitude of oscillation: 1,00 0,03 of arc selectivity: to be chosen to give at least50% full-scale deflection at M H die temperature: 160 C 0,3 C pre-heat time: noneBS5293-20:1992 BSI 08-1999 List of references See national foreword.BS 5293-20: 199
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