ISO-7387-1-1983.pdf
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1、International Standard 738711 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEI+(AYHAPOAHAR OPrAHM3AMR l-IO CTAHAPTM3ALWWORGANISATlON INTERNATIONALE DE NORMALISATION Adhesives with solvents for assembly of u PVC pipe elements - Characterization - Part 1 : Basic test methods Adhkfs Section two : con
2、ventional dry matter content; Section three : ash content. (Applicable only to adhesives which do not contain a filler unstable at the test temperature.) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not
3、 for Resale, 04/23/2007 23:10:23 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 7387/1-1983 (EI Section one : Viscosity 2 General Two test methods are specified for the determination of this characteristic. The first allows the measurement of dynamic viscosity accordin
4、g to the shear rate; this is the reference method. The second is the Brookfield method which tan be reserved, for example, for manufacturing inspection. 3 Dynamit viscosity according to shear rate 3.1 Definitions For the purpose of this International Standard, the viscosity of a Solution is defined
5、as follows : Consider a volume of liquid lying within two parallel planes, A and B. Plane A is stationary, plane B is moved at a uniform velocity v by a forte F. Assuming laminar flow, when rate velocity v is low, it tan be assumed that the laminar elements of liquid slide in relation to each other
6、at a uniform shear rate defined by the formula : Y dv =- dY In the case of laminar flow, 9 is in direct proportion to the forte applied per surface unit, A : 9 1 F =- 21 X where q is the reciprocal of the coefficient of proportionality, that is the dynamic viscosity of the liquid under consideration
7、; in Pascals seconds (Pas)*; F - = z A is the shear stress, in Pascals (Pa); 9 is the shear rate, in seconds to the power minus one (s-1). Liquids for which, at a given temperature, z is independent of 9 are called Newtonian. In other cases, the liquid is said to be non-Newtonian. x A liquid tan the
8、refore only be characterized by its viscosity coefficient if it is Newtonian. If this is not so, the value of 9 or z for which 1;1 is indicated shall be stated. 3.2 Principle Measuring, at a determined temperature, the value of torque required to overcome the resistance of adhesive to the move- ment
9、 of an immersed rotor turning at a determined and con- stant rate. Plotting of the shear stress curve as a function of the shear rate (t = vj% 3.3 Apparatus Viscometer, with a cylindrical moving body, turning in a vessel which is also cylindrical. The vessel and the cylinder are strictly coaxial. Th
10、is viscometer shall be equipped with the following : - manual switch allowing selection of known shear rates; - measuring equipment allowing a value p proportional to the viscosity and to the shear stress z to be indicated. - thermostatically controlled environment, enabling the revolving moving bod
11、y and the vessel to be kept at a con- stant temperature. 3.4 Preparation of the test Sample Mix the adhesive to make it homogeneous and take a Sample of sufficient volume to enable two measurements to be carried out. * 1 Pa-s = 1 Nes/m2 = 103 CP (centipoise). 2 Copyright International Organization f
12、or Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 23:10:23 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 7387/1-1983 (E) 3.5 Procedure c) the temperature of the determination; Condition
13、the following for 16 h at a temperature of 23 + 1 OC: d) the values mean value; of z obtained for each nation, and the - the Sample of the solvents) (in a closed Container to avoid evaporation e) the z = J(y) curves, determined as shown in 3.5. - the and dry) moving body and vessel Chosen ( perfectl
14、y 4 Brookfield viscosity Carry out the measurements after selecting the cylinder and the required range for the shear rate and setting the thermostati- cally controlled environment at the temperature of 23 + 1 OC. 4.1 General This method is largely based on ISO 2555, Resins in the Liquid state or as
15、 emulsions or dispersions - Determination of the Brookfield R V viscosiiy. NOTE - It may be necessary to coat the outside of the vessel with glycerine (for example) to ensure suitable thermal contact between it and the thermostatically controlled environment. Determine the curve z = q 9 by varying t
16、he shear increasing values followed by decreasing values. rate 9 first by - sampling; 3.6 Expression of results - preparation and conditioning of the test Portion; The that measuring appliance gives an indication of a value p such - a further possibility of the moving body; regarding the choice of S
17、peed B P=VAu - the temperature at which the test shall be carried out. 4.2 Principle is the dynamic viscosity, in Pascals seconds (Pas); A moving body of cylindrical or related shape (disc), driven by a synchronous motor, rotates at constant Speed around its axis in the adhesive being examined. A an
18、d B are constants relating to the equipment used; u B =- Y is the instrument reading which is in inverse Proportion to the shear rate jL The resistance exerted by the adhesive against the moving body, which depends on the viscosity of the product, Causes tension in a spring coil which is indicated b
19、y the movement of a needle on a dial. From the above formula and the ratio z = 9, calculate the values of shear stress 2, in Pascals (Pa), obtained for each value of 9, at the temperature of the determination. The “Brookfield viscosity” is measured by multiplying the value of this movement by a coef
20、ficient depending on the Speed of rotation and the characteristics of the moving body. Record for each value values of z measured. of jj the arithmetic mean of the two The products to which this method applies are generally non- Newtonian, and the viscosity measured depends on the shear rate to whic
21、h the product is subjected during measurement. The test shall be more than 5 %. considered invalid if the two differ bY However, in this type of viscometer, the shear rate is not the same at all Points on the moving body. Therefore, for non- Newtonian liquids, the result of measurement is not that o
22、f a “viscosity” at known shear rate, which is why it is conven- tionally called “Brookfield RV viscosity”. From the paired values of 9 and z, obtained by increasing then decreasing the value of 9, plot the curves z ZE f(r) 3.7 Test report The test report shall include the following information : 4.3
23、 Apparatus a) reference to this International Standard; 4.3.1 RV model synchro-lectric Brookfield viscometer, (RVF, RVF-100 or RVT), to be Chosen according to the product being studied and the accuracy of measurement required. b) the full reference of the adhesive examined; 3 Copyright International
24、 Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 23:10:23 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO7387/1-1983 (EI NOTE - RV model Brookfield viscometers allow viscos
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