1、BRITISH STANDARD BS2782-8: Method835B: 1980 Methods of testing Plastics Part8: Other properties Method835B: Determination of gelation time of polyester resins (manual method) IMPORTANT NOTE. Before reading this method it is essential to read the foreword, general introduction and instructions to BS2
2、782, issued separately. UDC 678.5/.8:678.01:536.421.4:678.674BS2782-8:Method 835B:1980 This British Standard, havingbeen prepared under thedirection of the Plastics Standards Committee, was published under the authority ofthe Executive Board and comesinto effect on 30 May1980 BSI 10-1999 The followi
3、ng BSI references relate to the work on this standard: Committee reference PLC/17 Draft for approval79/51003DC ISBN 0 580 11310 8 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. Compl
4、iance 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 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpo
5、rated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS2782-8:Method 835B:1980 BSI 10-1999 i Contents Page 0 Introduction 1 1 Scope 1 2 References 1 3 Principle 1 4 Reagents 1 5 Apparatus 1 6 Test temperatu
6、re 1 7 Procedure 1 8 Expression of results 2 9 Test report 2 Figure 1 Typical apparatus for determination of gelation time of polyester resin (manual method) 2ii blankBS2782-8:Method 835B:1980 BSI 10-1999 1 0 Introduction This method has been prepared under the direction of the Plastics Standards Co
7、mmittee. It is one of a series of methods for determination of gelation time of resins, the others being as follows. It should be noted that BS4584 “Metal-clad base materials for printed circuits” Part11 “Bonding sheet material for use in the fabrication of multi-layer printed boards: EP-GC-11” also
8、 includes a method for testing resins used for laminates, etc. This method describes a procedure for determining the gelation time of a polyester system when maintained at a specified temperature. The method covers the requirements of method111C of BS2782:1970 which is therefore being withdrawn. WAR
9、NING NOTE. This method does not necessarily detail all precautions necessary to meet the requirements of the Health and Safety at Work etc. Act1974. Attention should be paid to any appropriate safety precautions, and the method should be operated only by trained personnel. 1 Scope This method descri
10、bes a procedure for determining the gelation time of a catalysed polyester system when maintained at a specified temperature. 2 References The following standards publications are referred to in this method. BS572, Interchangeable conical ground glass joints. BS3787, Glass condensers with standard j
11、oints. 3 Principle The time is measured for gelation of a mixture of resin and catalyst maintained nominally at a temperature of82 C or117 C. 4 Reagents The following reagents are required. All reagents used (except where stated) shall be of analytical quality. 4.1 Butan-1-ol, b.p.116 C to118 C. 4.2
12、 Propan-2-ol, b.p.82.4 C. 4.3 Liquid paraffin, B P quality. 5 Apparatus The following apparatus is required. 5.1 Flask,150ml, with round bottom fitted with a34/35conical joint complying with the requirements of BS572. 5.2 Heating bath or mantle 5.3 Adaptor, with34/35conical joint and side neck with1
13、9/26conical joint complying with the requirements of BS572. 5.4 Liebig condenser, of nominal length300mm, with conical joint. The condenser shall comply with the requirements of BS3787 and the conical joint shall comply with the requirements for joint19/26 of BS572. 5.5 Test tubes, of heat resistant
14、 glass,150mm long and25mm in diameter and150mm long and19mm in diameter. 5.6 Glass stirring rod,7mm in diameter. 5.7 Timing device, accurate to1s or less. 6 Test temperature The test temperature shall be preferably81 C to82.5 C or116 C to118 C as appropriate, but other test temperatures may be used
15、depending on the choice of a suitable reagent used in the flask. NOTEThe temperature used in method111C of BS2782:1970 was81 C to82.5 C. 7 Procedure Assemble the apparatus as shown in Figure 1. Place6g to7g of the liquid paraffin in the test tube (B) and50ml of the propan-2-ol or butan-1-ol, as appr
16、opriate, in the flask (A) and raise the alcohol to boiling point by means of a heating bath or mantle, so that the test tube (B) is maintained at a temperature of81 C to82.5 C (using propan-2-ol) or116 C to118 C (using butan-1-ol). Method835A Determination of gelation time of phenolic resins Method8
17、35C Determination of gelation time of polyester and epoxide resins using a gel timer Method835D Determination of gelation time of thermosetting resins using a hot plate Method835E Determination of gelation time of resin in impregnated materials used for laminatesBS2782-8:Method 835B:1980 2 BSI 10-19
18、99 To100g of the polyester resin add to an accuracy of2.5% the amount of catalyst specified by the resin manufacturer and following the manufacturers instructions. Then pour a25mm deep layer of the resin mixture into test tube (C) and immediately reassemble the apparatus. Start the timing device imm
19、ediately the test tube (C) is immersed in the liquid paraffin. Place the stirring rod in the resin mixture and stir it by moving the rod one complete revolution of the diameter of the tube (C) about every15s until gelation occurs. Stop the timing device and note the time for gelation. Make a second
20、determination using fresh test portions from the same samples of components of the resin system. 8 Expression of results Calculate the mean of the two results and report this mean as the gelation time expressed in minutes. 9 Test report The test report shall include the following particulars. a) A c
21、omplete identification of the material tested, including type, source, manufacturers code number and previous history. b) A reference to the British Standard method i.e.BS2782:Method835B:1980. c) The test temperature. d) The result of the test and, if required, the individual results. Figure 1 Typic
22、al apparatus for determination of gelation time of polyester resin (manual method)blankBS2782-8: Method835B: 1980 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standa
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