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1、BRITISH STANDARD BS 3424-22: 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 ge
2、neral introduction”. UDC 677.077.652:678.066.2:677.019.348 BS 3424-22:1983 This British Standard, having been prepared under the direction of the Fibres, Yarns and Fabrics Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 May 1983 BSI 03-1999 The
3、following 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 issueComments BS 3424-22:1983 BSI 03-1999i Contents Page Forewordii 1Scope1 2Method 25A: determination of fusi
4、on of PVC coatings1 3Method 25B: determination of state of cure of vulcanized rubber coatings (subjective method)1 Table 1 Reagents and polymers1 Publications referred toInside back cover BS 3424-22:1983 ii BSI 03-1999 Foreword The methods of test described in this Part of BS 3424 are included becau
5、se 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 method 2
6、5A fulfils all the requirements of ISO 6451 published by the International Organization for Standardization (ISO). Because of the subjective means of assessing the results of method 25B, it is not suitable for inclusion in British Standard product specifications as a method for assessing the degree
7、or extent 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 method 25 of BS 3424:1973. A British Standard does not purport to include all the necessary p
8、rovisions 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, pages i and ii, pages 1 and
9、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 amendment table on the inside front cover. BS 3424-22:1983 BSI 03-19991 1 Scope This Part of this British Standard describes methods f
10、or the determination 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 suitab
11、le for coatings 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 of 5 mm diameter. 2.1.3 Acetone complying with BS 509. 2.2 Preparation of test specimens. Cut from the sample three test specimens, or, if the material under test
12、 is double-faced cut six test specimens, each 20 mm 40 mm. Take test specimens so that they are evenly distributed across the full width of the sample but not within 200 mm of a selvedge. 2.3 Procedure. Heat the test specimens for 1 h at 65 C to 70 C in order to remove any residual solvents. Allow t
13、he test specimens to cool 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 (see 2.1.2) with the coating to be evaluated outermost. Secure the test specimen in place around the glass rod with a suitable
14、clip. Immerse each test specimen in acetone (see 2.1.3) at a temperature of 20 2 C for 15 min. 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
15、-faced coated fabrics. 2.4 Expression 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)
16、 if no signs of cracking or disintegration 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:
17、determination of state of cure of vulcanized rubber coatings (subjective method) 3.1 Reagents and polymers. The reagent required for each polymer is given in Table 1. CAUTION. In carrying out this test, due notice should be taken of the potentially hazardous nature of the reagent used. Particular ca
18、re should be taken to avoid contact with the eyes, and the use of eye protectors complying with BS 2092 is recommended. 3.2 Apparatus 3.2.1 Graduated pipette, 10 mL capacity. 3.2.2 Watch glass, 50 mm diameter. 3.2.3 Stopwatch. 3.2.4 Filter paper1). 3.3 Preparation of test specimens. Cut from the sam
19、ple either three test specimens or, if the material under test is double-faced, six test specimens, each 100 mm 100 mm. Take test specimens so that they are evenly distributed across the width of the sample but not within 200 mm of a selvedge. 3.4 Procedure. Where double texture fabrics are to be te
20、sted, remove sufficient of the surface textile to enable the test to be conducted. Ensure that the surface of the test specimen is free of dust. Apply 1.0 mL of the appropriate solvent given in Table 1 to the centre of the test specimen, cover the solvent-covered area with a watch glass. Table 1 Rea
21、gents and polymers 1) Whatman No. 41 is suitable. Polymer typeReagent to be used ChemicalTo BS: Natural rubberXylene458/3a Styrene-butadiene rubbersXylene458/3a ButadienesXylene458/3a IsoprenesXylene458/3a Ethylene/propyleneXylene458/3a ChloroprenesXylene458/3a ButylsXylene458/3a UrethanesButanone 1
22、940 Chlorosulphonated polyethylenes Xylene458/3a PVC nitrilesButanone 1940 Butadiene/AcrylonitrilesButanone 1940 a BS 458/3 is contained in BS 135, BS 458, BS 805. BS 3424-22:1983 2 BSI 1998 Ensure that the fingers are dry and free of foreign matter. After 120 s remove the watch glass and any residu
23、al solvent by means 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
24、 fabric; b) the results 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. BS 3424-22:1983 BSI 03-199
25、9 Publications referred to BS 135, BS 458, BS 805, Specifications for benzene, xylenes and toluenes. BS 509, Acetone. BS 1940, Butanone (methyl ethyl ketone). BS 2092, Industrial eye-protectors. ISO 6451, Plastics coated fabrics Polyvinyl chloride coatings Rapid method of checking fusion2). 2) Refer
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