1、BRITISH STANDARD BS3424-22: 1983 Testing coated fabrics Part 22: Method 25. Methods for determination of fusion of PVC coatings and the state of cure of vulcanized rubber coatings IMPORTANT NOTE. It is recommended that this Part be read in conjunction with the information in Part 0 “Foreword and gen
2、eral introduction”. UDC 677.077.652:678.066.2:677.019.348BS3424-22:1983 This British Standard, having been prepared under the directionof the Fibres, Yarns andFabrics Standards Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 31 May 1983 BSI 03-1999 The following
3、BSI references relate to the work on this standard: Committee reference FBM/13 Draft for comment 82/35564 DC ISBN 0 580 11940 8 Amendments issued since publication Amd. No. Date of issue CommentsBS3424-22:1983 BSI 03-1999 i Contents Page Foreword ii 1 Scope 1 2 Method 25A: determination of fusion of
4、 PVC coatings 1 3 Method 25B: determination of state of cure of vulcanized rubber coatings (subjective method) 1 Table 1 Reagents and polymers 1 Publications referred to Inside back coverBS3424-22:1983 ii BSI 03-1999 Foreword The methods of test described in this Part of BS3424 are included because
5、of their value as control tests in the manufacture of coated fabrics. As a general rule if fusion or vulcanization is incomplete the mechanical and physical properties of the coated fabric will be insufficient and consequently further testing will not be worthwhile. The test described in method25A f
6、ulfils all the requirements of ISO 6451 published by the International Organization for Standardization (ISO). Because of the subjective means of assessing the results of method25B, it is not suitable for inclusion in British Standard product specifications as a method for assessing the degree or ex
7、tent of cure of vulcanized rubber coatings. Test methods for studying the degree of cure or extent of crosslinking are being developed and will be published as soon as practicable. This Part supersedes method25 of BS3424:1973. A British Standard does not purport to include all the necessary provisio
8、ns 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. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, an insid
9、e 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 amendment table on theinside front cover.BS3424-22:1983 BSI 03-1999 1 1 Scope This Part of this British Standard describes methods for the determ
10、ination of fusion of PVC coatings and the determination of the state of cure of vulcanized rubber coatings. NOTEThe titles of the publications referred to in this Part are listed on the inside back page. 2 Method 25A: determination of fusion of PVC coatings NOTEThis method is not suitable for coatin
11、gs based upon PVC latices or certain PVC copolymers. 2.1 Apparatus and reagent 2.1.1 Glass vessel and cover. 2.1.2 Glass rod of5mm diameter. 2.1.3 Acetone complying with BS509. 2.2 Preparation of test specimens. Cut from the sample three test specimens, or, if the material under test is double-faced
12、 cut six test specimens, each20mm 40mm. Take test specimens so that they are evenly distributed across the full width of the sample but not within 200mm of a selvedge. 2.3 Procedure. Heat the test specimens for1h at65 C to70 C in order to remove any residual solvents. Allow the test specimens to coo
13、l to room temperature. Examine each test specimen for evidence of cracks or holes and record the results. Fold each test specimen over the glass rod (see2.1.2) with the coating to be evaluated outermost. Secure the test specimen in place around the glass rod with a suitable clip. Immerse each test s
14、pecimen in acetone (see2.1.3) at a temperature of20 2 C for15min. Remove the test specimens from the acetone and examine the coating visually for signs of cracking or disintegration. Disregard any removal of lacquer or surface effects. Test separately each face of double-faced coated fabrics. 2.4 Ex
15、pression of results. Record any new cracks or holes that have appeared in the test specimen. 2.5 Test report. The test report shall include the following particulars: a) the description of the coated fabric; b) the results of the test recorded in the following manner: 1) if no signs of cracking or d
16、isintegration of the coating, report “Fusion complete”; 2) if any new cracks or holes appear in the test specimen or there are signs of disintegration of the coating, report “Fusion incomplete”; c) details of any deviation from the standard test procedure. 3 Method 25B: determination of state of cur
17、e of vulcanized rubber coatings (subjective method) 3.1 Reagents and polymers. The reagent required for each polymer is given inTable 1. CAUTION. In carrying out this test, due notice should be taken of the potentially hazardous nature of the reagent used. Particular care should be taken to avoid co
18、ntact with the eyes, and the use of eye protectors complying with BS2092 is recommended. 3.2 Apparatus 3.2.1 Graduated pipette, 10mL capacity. 3.2.2 Watch glass, 50mm diameter. 3.2.3 Stopwatch. 3.2.4 Filter paper 1) . 3.3 Preparation of test specimens. Cut from the sample either three test specimens
19、 or, if the material under test is double-faced, six test specimens, each100mm 100mm. Take test specimens so that they are evenly distributed across the width of the sample but not within200mm of a selvedge. 3.4 Procedure. Where double texture fabrics are to be tested, remove sufficient of the surfa
20、ce textile to enable the test to be conducted. Ensure that the surface of the test specimen is free of dust. Apply1.0mL of the appropriate solvent given inTable 1 to the centre of the test specimen, cover the solvent-covered area with a watch glass. Table 1 Reagents and polymers 1) Whatman No. 41 is
21、 suitable. Polymer type Reagent to be used Chemical To BS: Natural rubber Xylene 458/3 a Styrene-butadiene rubbers Xylene 458/3 a Butadienes Xylene 458/3 a Isoprenes Xylene 458/3 a Ethylene/propylene Xylene 458/3 a Chloroprenes Xylene 458/3 a Butyls Xylene 458/3 a Urethanes Butanone 1940 Chlorosulph
22、onated polyethylenes Xylene 458/3 a PVC nitriles Butanone 1940 Butadiene/Acrylonitriles Butanone 1940 a BS 458/3 is contained in BS135, BS458, BS805.BS3424-22:1983 2 BSI 1998 Ensure that the fingers are dry and free of foreign matter. After120s remove the watch glass and any residual solvent by mean
23、s of a filter paper. Assess by touch the surface of the polymer for signs of tackiness. 3.5 Expression of results. Record any signs of tackiness of the surface of the polymer. 3.6 Test report. The test report shall include the following particulars: a) the description of the coated fabric; b) the re
24、sults of the test recorded in the following manner: 1) if no signs of tackiness are recorded report “Cure satisfactory”; 2) if any signs of tackiness are recorded report “Insufficiently cured”; c) details of any deviation from the standard test procedure.BS3424-22:1983 BSI 03-1999 Publications refer
25、red to BS135, BS 458, BS 805, Specifications for benzene, xylenes and toluenes. BS509, Acetone. BS1940, Butanone (methyl ethyl ketone). BS2092, Industrial eye-protectors. ISO6451, Plastics coated fabrics Polyvinyl chloride coatings Rapid method of checking fusion 2) . 2) Referred to in the foreword
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