1、BRITISH STANDARD Adhesives Determination of viscosity The European Standard EN 12092:2001 has the status ofa British Standard ICs 83.180 BS EN 12092:2001 Wk present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;
2、 monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its secretary. Cr oss-r e fer enc e s The British Standards which implement international or European publications referred to
3、 in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contrac
4、t. 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, the EN title page, pages 2 to 12, an inside back c
5、over and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 22 March 2002 ISBN O 580 39284 8 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12092 October 2001 ICs 83.180 English version Adhesives - Determination of viscosity Adhsi
6、fs - Dtermination de la viscosit Klebstoffe - Bestimmung der Viskositt This European Standard was approved by CEN on 30 September 2001 CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national st
7、andard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other l
8、anguage made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
9、 Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2001 CEN All rights of exp
10、loitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12092:2001 E EN 12092:2001 (E) Contents Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 5 4 Choice of the preferred method . 5 5 Safety 5 6 Test methods . 5 Annex A (informative) D
11、ynamic and kinematic viscosity . Definition and calculation 12 2 EN 12092:2001 (E) Foreword This European Standard has been prepared by Technical Committee CEN/TC 193 “Adhesives“, the secretariat of which is held by AENOR. This European Standard shall be given the status of a national standard. eith
12、er by publication of ai? identical text or by endorseinent. at the latest by April 2002, ai?d conflicting national standards shall be withdrawn at the latest by April 2002. In this standard the Annex A is informative. According to the CENKENELEC Internal Regulations, the national standards organizat
13、ions of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 3 EN 12092:2001 (E) 1 Sco
14、pe This European Standard specifies six methods which, experience has shown, are suitable for measuring the viscosity of a wide range of adhesives: - rotational viscometer method; - cone and plate viscometer method; - falling ball viscometer method; - glass capillary viscometer method; - flow cup me
15、thod; - pressurised extrusion method. This standard does not intend to describe equipment, which is unique to one manufacturer, rather it describes generic types of viscometer. The instruments described operate on very different principles making it inadvisable to compare results from one type of vi
16、scometer with those from another. However, results from different instruments of the same type should be comparable. NOTE 1 Some modern viscometers incorporate integrated electronic measuring devices and have a high degree of automation. The user will not necessarily have access to (or need to know)
17、 full details of an instruments measuring systems. However, all viscometers are capable of being calibrated and, to conform to this standard, the viscometer used should be calibrated in the appropriate viscosity range before a test. Certified calibration fluids should be used for this purpose and ev
18、idence of calibration given with the test results. NOTE 2 The properties of many adhesives are very sensitive to test conditions. It is important therefore that the test report contains comprehensive information on the conduct of the test. 2 Normative references This European Standard incorporates b
19、y dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European stan
20、dard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 923 Adhesives - Terms and definitions. EN 1066 Adhesives - Sampling. EN 1067 EN IS0 2431 EN IS0 2555 EN IS0 3104 Adhesives - Determi
21、nation and preparation of samples for testing. Paints and varnishes - Determination of flow time by use of flow cups (IS0 2431: 1993, including Technical corrgendum I: 1994). Plastics - Resins in the liquid state or as emulsions or dispersions - Determination of apparent viscosity by the Brookfield
22、test method (IS0 2555: 1989). Petroleum products - Transparent and opaque liquids - Determination of kinematic viscosity and calculation of dynamic viscosity (IS0 3104: 1994). 4 EN 12092:2001 (E) EN IS0 3219 IS0 3105 IS0 4575 ISO/DIS 12058-2 Plastics - Polymers/resins in the liquid or as emulsions o
23、r dispersions - Determination of viscosity using a rotational viscometer with defined shear rate (IS0 3219: 1993). Glass capillary kinematic viscometers - Specifications and operating instructions. Plastics - Polyvinyl chloride pastes - Determination of apparent viscosity using the Severs viscometer
24、. Plastics - Determination of viscosity using a falling ball viscometer - Part 2: Free-falling-ball method. 3 Terms and definitions For the purposes of this European Standard the following term and definition, together with those given in EN 923, apply. 3.1 property of a material to resist deformati
25、on increasingly with increased rate of deformation viscosity 4 Choice of the preferred method The preferred method shall be chosen according to the types and requirements of the adhesives used. For Newtonian liquids with viscosity below 10 Pa.s, the method described in 6.5 is preferred. The alternat
26、ive methods are given in 6.4 and 6.6. For Newtonian liquids with a viscosity higher than 10 Pa.s, the methods described in 6.2 and 6.7 are preferred. For non-Newtonian liquids the method described in 6.3 is preferred. The method given in 6.2 can also be used. NOTE the rate of shear in simple shear f
27、low and with zero normal stress differences. Newtonian liquid or ideal liquid is defined as a liquid characterized by a constant value for the shear stress divided by Non-Newtonian liquid or non-ideal liquid is defined as a liquid not exhibiting Newtonian behaviour. 5 Safety Persons using this stand
28、ard shall be familiar with normal laboratory practice. This standard does not purport to address all the safety problems, if any, associated with its use. It is the responsibility of the user to establish health and safety practices and to ensure compliance with any European and national regulatory
29、conditions. 6 Test methods 6.1 General All the procedures described in the following test methods shall be carried out in duplicate. The difference between the values of two consecutive tests shall be less than 5% and less than 3% for the test method described in 6.2, in particular. If this is not t
30、he case, further tests shall be carried out until this requirement is fulfilled. 5 EN 12092:2001 (E) 6.2 Rotational viscometer method 6.2.1 Principle A spindle, usually in the shape of a cylinder or disc, rotates at a constant speed in the adhesive. The instrument measures the torsional resistance o
31、f rotation. Factors, which depend on the speed of rotation and the characteristics of the spindle, are applied to the torsional resistance measurement resulting in an estimate of the coefficient of viscosity. The method is often applied to non-Newtonian fluids and the viscosity measured depends on t
32、he rate of shear A detailed description of the apparatus to be used and further details of this method are given in EN IS0 2555 and EN IS0 3219. 6.2.2 Procedure 6.2.2.1 Prepare the adhesive in accordance with the manuacturers instructions. Unless otherwise specified, take a sample of the adhesive in
33、 accordance with EN 1066 and examine and prepare it in accordance with EN 1067. 6.2.2.2 Set up, calibrate and operate the viscometer in accordance with the manufacturers instructions. Spindles and speeds shall be chosen such that the instrument reading is in the range of 20% to 95% of the full scale
34、 value. 6.2.2.3 Ensure that the temperature of the test specimen is within the prescribed limits. Unless otherwise specified, the temperature of the test specimen shall be maintained at (23*0,5)“C. Heat or cool the container holding the test specimen by immersion in a thermostatically controlled bat
35、h. Special attachments are usually available for testing hot melt adhesives. 6.2.2.4 Start the motor and leave the spindle turning in the adhesive until a steady value is recorded. In some fluids the reading of the instrument will not settle, but will continue to drift. In such cases, record the rea
36、ding after a specific time. 6.2.2.5 Stop the motor, wait until the spindle has stopped, then restart the motor and take a second measurement. 6.2.2.6 Repeat the process described in 6.2.2.5 until two consecutive readings differ by no more than 3%. Take the average of these two values. 6.2.2.7 After
37、each determination, remove the spindle from the appliance and wash it carefully in the appropriate solvent. 6.2.3 Expression of results Calculate the estimate of viscosity by the method prescribed by the manufacturer of the viscometer Express the result to three significant figures in units of Pa.s
38、or in mPa.s as appropriate. If required, plot the characteristic viscositykhear rate curve for the adhesive. 6.2.4 Test report The test report shall contain, at least, the following information: a) reference to this European Standard; b) identification of the product tested including details of any
39、mixing or other preparations carried out; c) the test temperature; d) details of the viscometer, manufacturer and model, including the spindles and speeds used and the shear rate, if known; e) in cases where a measurement was taken after a specific time, the value of this time period; 6 EN 12092:200
40、1 (E) f) the vaiue(s) of the viscosity expressed as indicated in 6.2.3; g) proof of instrument calibration; h) the test date. 6.3 Cone and plate viscometer method 6.3.1 Principle The adhesive under test is contained between the conical end of a rotating disc and a static plate. The viscosity of the
41、adhesive is related to the torque required to maintain a given speed of rotation and the diameter and angle of the cone. A detailed description of the apparatus to be used and further details on this method are given in EN IS0 3219. 6.3.2 Procedure 6.3.2.1 Prepare the adhesive in accordance with the
42、 manufacturers instructions. Unless otherwise specified, take a sample of the adhesive in accordance with EN 1066 and examine and prepare it in accordance with EN 1067. 6.3.2.2 Set up and calibrate the viscometer in accordance with the manufacturers instructions. Unless otherwise stated the instrume
43、nt shall be adjusted to a shear rate of 18 O00 s-. 6.3.2.3 With the cone in the operating position but with no adhesive in place, ensure that the viscometer reaches the prescribed temperature. Unless otherwise specified, the test shall be carried out at (23 f 0,5)”C. 6.3.2.4 Start the cone rotating
44、and zero the instrument. 6.3.2.5 Stop the rotation and raise the cone to a high position. 6.3.2.6 Place a small amount of the adhesive (as specified by the viscometer manufacturer) in the centre of the plate and lower the cone again to the operating position. 6.3.2.7 Remove excess adhesive. 6.3.2.8
45、Wait approximately 15 s for the sample to reach the test temperature. 6.3.2.9 Start the cone rotating. Allow the reading to reach a steady value and record the reading. 6.3.2.10 After each determination carefully clean all components with an appropriate solvent. 6.3.3 Expression of results Calculate
46、 the estimate of viscosity by the method prescribed by the manufacturer of the viscometer Express the result to three significant figures in units of Pa.s or in mPa.s as appropriate. If required, plot the characteristics viscositykhear rate curve for the adhesive. 6.3.4 Test report The test report s
47、hall contain, at least, the following information: a) reference to this European Standard; b) identification of the product tested including details of any mixing or other preparations carried out; c) the test temperature; 7 EN 12092:2001 (E) d) details of the viscometer, manufacturer and model, inc
48、luding the spindles and speeds used and the shear rate, if known; e) in cases where a measurement was taken after a specified time, the value of this time period; f) the vaiue(s) of the viscosity expressed as indicated in 6.3.3; g) proof of instrument calibration; h) the test date. 6.4 Falling ball
49、viscometer method 6.4.1 Principle The time for a ball of known density to fall through a known distance in a column of adhesive is used to estimate the viscosity of the adhesive. The tube containing the adhesive is contained within a thermostatically controlled sleeve. The measurement range of the instrument can be extended by using a series of standardized balls and tubes. A detailed description of the apparatus to be used and further details on this method are given in ISO/DIS 12058-2. 6.4.2 Procedure 6.4.2.1 Prepare the adhesive in accordance with the manufacturer instru
