BS-5350-B5-1976.pdf
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1、BRITISH STANDARD BS 5350-B5: 1976 Incorporating Amendment No. 1 Methods of test for Adhesives Part B5: Determination of gelation time UDC 665.93:620.1 + 665.93:66.095.2640 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:58:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-B5:1976 BSI 1
2、1-1999 ISBN 0 580 09103 1 Foreword Gelation time, as defined in clause 3, is applicable to solvent-containing and solventless systems and provides a simple means of assessing the rate of polymerization or the efficiency of curing agents. Certain systems when fully cured may only develop very soft ge
3、ls which break into lumps upon inversion of the tubes. Similar systems, at an earlier stage of polymerization, will flow evenly and this difference in behaviour may provide an adequate criterion. With hot-melt adhesives, dwell time in the hot application equipment is important. A method for the dete
4、rmination of heat stability of hot-melt adhesives is given in BS 5350-H1. 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
5、immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, page 1 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
6、inside front cover. Amendments issued since publication Amd. No.DateComments 5359February 1987 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:58:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-B5:1976 BSI 11-1999i Contents Page Foreword Inside f
7、ront cover 1Scope1 2References1 3Definition1 4Method 1: gelation time at 25 C of solvent-containing adhesives1 5Method 2: gelation time for solventless adhesives1 6Expression of results1 7Test report1 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:58:03 GMT+00:00 2006, Uncontrolled Copy,
8、(c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:58:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-B5:1976 BSI 11-19991 1 Scope Two methods of test are specified in this Part. Method 1 has an arbitrary endpoint and is suitable for comparative and quality control purp
9、oses. Method 2 is suitable for solventless systems and corresponds to BS 2782:Method 835C:1980. It can be used for high-viscosity materials, which may contain a proportion of solvent. 2 References This Part makes reference to the following standards publications: BS 2782, Methods of testing plastics
10、 Method 835C Determination of gelation time of polyester and epoxide resins using a gel timer. BS 5350, Methods of test for adhesives Part H1 Determination of heat stability of hot melt adhesives in the application equipment . 3 Definition For the purposes of this Part, the following definition appl
11、ies. gelation time the time taken for a two (or more) part system to form a gel of reproducible, but arbitrary, consistency under standard conditions 4 Method 1: gelation time at 25 C of solvent-containing adhesives 4.1 Principle. The adhesive components are mixed at a specified temperature and main
12、tained, in stoppered glass tubes, at an even temperature. The contents are examined at specified periods for evidence of flow. 4.2 Apparatus 4.2.1 Constant-temperature bath (or oven) capable of being controlled at 25 0.2 C. 4.2.2 Glass tubes of approximately 150 ml capacity and approximately 35 mm i
13、nternal diameter, each fitted with an airtight stopper. 4.2.3 Timing device, accurate to 1 min or less. 4.3 Procedure. Bring the individual components to a temperature of 25 1 C and then mix in the proportions and manner described by the manufacturer. The proportions shall be accurate to within 2.5
14、% of those specified by the manufacturer. Unless the manufacturers instruction require otherwise, complete the addition and intermixing of the components in not less than 60 s and start the timing device as soon as the addition of the final component is completed. Place approximately 75 ml of the mi
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