1、BRITISH STANDARD BS 2782-4: Method 454G: 1996 ISO 4576:1996 Methods of testing Plastics Part 4: Chemical properties Method 454G: Polymer dispersions Determination of sieve residue (grossparticle and coagulum content) ICS 83.080BS2782-4:Method454G:1996 This British Standard, having been prepared unde
2、r the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 October 1996 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference PRI/21 Draft for comment 94/341937 DC I
3、SBN 0 580 26043 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/21, Testing of plastics, upon which the following bodies were represented: The British Apparel and Textile Confederation British Plastics Federation De
4、partment of the Environment (Building Research Establishment) Department of Trade and Industry (National Physical Laboratory) Electrical and Electronic Insulation Association GAMBICA (BEAMA Ltd.) Institute of Materials Ministry of Defence Packaging and Industrial Films Association PIRA International
5、 RAPRA Technology Ltd. Royal Society of Chemistry Amendments issued since publication Amd. No. Date CommentsBS2782-4:Method454G:1996 BSI 11-1998 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Principle 1 4 Reagents 1 5 Apparatus 1
6、6 Sampling 1 7 Procedure 1 8 Expression of results 2 9 Precision 2 10 Test report 2 Figure 1 Example of filtration apparatus 3 List of references Inside back coverBS2782-4:Method454G:1996 ii BSI 11-1998 National foreword This British Standard has been prepared by Technical Committee PRI/21 and is id
7、entical with ISO 4576:1996 Plastics Polymer dispersions Determination of sieve residue (gross particle and coagulum content), published by the International Organization for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO3310-1:1990 to which normative reference is m
8、ade in the text and has decided that they are acceptable for use in conjunction with this standard. A related British Standard is BS410:1986 Specification for test sieves. NOTEInternational and European Standards as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick
9、High Road, London, W4 4AL. A British Standard 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-referenc
10、es Publication referred to Corresponding British Standard ISO 123:1985 BS 6057 Rubber lattices. Part 2:1987 Sampling (Identical) ISO 842:1984 BS 4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) Summary of pages This document comprises a front cover, an inside front c
11、over, pages i and ii, pages1 to 3, 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 theinside front cover.BS2782-4:Method454G:1996 BSI 11-1998 1 1 Scope This Internati
12、onal Standard specifies a method of determining the sieve residue (gross particle and coagulum content) of polymer dispersions, i.e. of particles much greater in diameter (for example 10 or 100 times) than the mean diameter of the other particles. This determination is carried out by sieve analysis.
13、 The sieves used depend on the type of dispersion under test and are in consequence to be specified, or agreed upon by the interested parties, for each dispersion or group of closely related dispersions. This International Standard refers only to coagulum-type content. Skinned material and fragments
14、 of skin larger than 5 mm are avoided while taking the sample (see clause 6) 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. A
15、ll 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 below. Members of IEC and ISO maintain registers of currently valid International Standar
16、ds. ISO 123:1985, Rubber latex Sampling. ISO 842:1984, Raw materials for paints and varnishes Sampling. ISO 3310-1:1990, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth. 3 Principle The polymer dispersion is diluted with a specified volume of deionized water an
17、d filtered through a metal gauze of a specified mesh size. The residue is washed with deionized water and then dried and weighed. 4 Reagents During the analysis, use only reagents of recognized analytical grade, and deionized water or water of equivalent purity. 4.1 Surfactants, for stabilizing the
18、polymer dispersion during testing (if necessary), as agreed between the interested parties. 5 Apparatus 5.1 Test sieves (series of metal gauzes, preferably stainless steel), as specified in ISO 3310-1, in the form of discs or squares, including at least meshes with the following aperture sizes: 45 m
19、, 63 m, 90 m, 125 m and 180 m Non-metallic gauzes may be used, but this shall be indicated in the test report. 5.2 Equipment to support the wire gauzes, such as steel rings or glass funnels of equal internal diameter between 25 mm and 50 mm. 5.3 Laboratory balances, one having an accuracy of 1mg for
20、 weighing test portions of up to 200 g (or10mg for test portions between 200 g and1000g) and the other having an accuracy of0,1mg for weighing the sieve (with and without the residue). 5.4 Normal oven or vacuum oven, capable of maintaining, to 2 C, a temperature of preferably105 C, or any of the fol
21、lowing alternative temperatures if more suitable for a particular dispersion: 80 C, 125 C or 140 C The temperature for drying the sieve residue shall be selected from those given, the preferred temperature being 105 C 2 C. The temperature chosen will depend on the stability of the polymer and the pr
22、esence of any additives, and shall be in line with the temperature recommended for the determination of the residue on drying of the polymer dispersion under test. 5.5 Desiccator, big enough to hold the gauzes. 5.6 Beaker, of capacity at least 600 ml, with a lip. 5.7 Filtration apparatus, as shown i
23、n Figure 1, for instance. 6 Sampling Sampling shall be carried out in accordance with one of the methods specified in ISO 123 or ISO 842 to obtain a homogeneous sample. Visible skin and skin fragments larger than 5mm shall be carefully avoided while sampling. 7 Procedure 7.1 Weigh approximately 100
24、g to 200 g (mass m 0 ) of the sample into the beaker (5.6). NOTE 1Depending on the required precision, larger test portions (up to 1 000 g) may be used. 7.2 Dilute the test portion with a volume, in millilitres, of water numerically equal to twice the mass of the test portion taken, adding a suitabl
25、e surfactant (4.1) if necessary to the water before dilution.BS2782-4:Method454G:1996 2 BSI 11-1998 NOTE 2Dilution with water prevents film formation and promotes mobility, thus ensuring rapid and complete filtration. The surfactant prevents additional agglomeration or coagulation occurring during t
26、he test. 7.3 Carefully mix the added water (plus surfactant, if used) into the polymer dispersion, using a glass rod or a slowly rotating stirrer to produce adequate mixing without destroying existing agglomerates. 7.4 For each mesh size used, prepare a suitably sized, clean metal gauze test sieve (
27、5.1), dry it in the oven (5.4) at 105 C 2 C or any of the other specified temperatures to constant mass and, after cooling in the desiccator (5.5), weigh the test sieve to the nearest 0,1mg (mass m 1 ). If the metal gauze is not clean, immerse it for30min in boiling water and rinse it with acetone b
28、efore drying to constant mass and weighing. For non-metallic gauzes, use appropriate cleaning procedures. 7.5 Place the sieve on a suitable support (5.2), and wet or wash the sieve with water or the appropriate surfactant solution (4.1). Pour the diluted dispersion on to the sieve, ensuring that the
29、 liquid is poured through the centre of the sieve. 7.6 On completion of the filtration, wash the residue on the sieve with the same diluent as used for the test portion, followed by deionized water, until a clear filtrate is obtained. 7.7 Dry the sieve plus residue in the oven at105C 2 C, or at the
30、alternative temperature selected, for approximately 30min, weigh, and repeat the drying for 15min periods until constant mass is reached. 7.8 Cool the sieve plus residue in the desiccator and weigh it to the nearest 0,1mg (mass m 2 ). 7.9 Do not rinse the sieve without proper cleaning. 7.10 Carry ou
31、t two determinations. 8 Expression of results 8.1 Calculate the sieve residue (gross particle and coagulum content) for a particular test sieve, expressed as a percentage by mass of the dispersion, using the formula where 8.2 Calculate the arithmetic mean of the two determinations for each test siev
32、e used, rounding to one place of decimals. The results of the individual determinations shall agree to 5% of the mean value. If they do not, carry out two further determinations until the results satisfy this condition. 9 Precision It is estimated that, if this test procedure is performed twice on t
33、he same day by the same person, using the same apparatus and testing the same laboratory sample, the two results will agree to within 8%. 10 Test report The test report shall include the following information: a) a reference to this International Standard; b) all details necessary for the identifica
34、tion of the polymer dispersion tested; c) the test sieve and drying temperature used; d) the sieve residue (gross particle and coagulum content); e) a description of the residue; f) any unusual feature noted during the determination; g) details of any deviation from the procedure specified in this I
35、nternational Standard or in the International Standards to which reference is made, as well as any operation considered as optional; h) the date and place of the test. m 2 m 1 m 0 -100 m 0 is the mass, in grams, of the test portion (see7.1); m 1 is the mass, in grams, of the test sieve (see7.4); m 2
36、 is the mass, in grams, of the sieve plus dried residue (coagulum) (see7.8).BS2782-4:Method454G:1996 BSI 11-1998 3 Figure 1 Example of filtration apparatus4 blankBS2782-4:Method454G:1996 BSI 11-1998 List of references See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | |
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