This standard specifies the general method for determining the viscosity or apparent viscosity of surfactant and detergent liquid products using a rotational viscometer. This standard is applicable to products with a viscosity of 5 to 5×10 4mPa·s. For Newtonian samples below 5mPa·s, a more accurate method should be used, such as a capillary viscometer. GB/T 15357-1994 Determination of the viscosity of liquid products using a rotational viscometer for surfactants and detergents GB/T15357-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Surface active agents and detergents-Determination of viscosity of liquid productsusing a rotational viscometer This standard is not equivalent to the international standard ISO6388-1989 "Surfactants 1 Subject content and scope of application
GB/T 15357-94
Determination of fluidity using a rotational viscometer".
This standard specifies the general method for determining the viscosity or apparent viscosity of surfactant and detergent liquid products using a rotational viscometer. This standard is applicable to products with a viscosity of 5 to 5×10°mPa·s. For Newtonian samples below 5mPa·s, a more accurate method should be used: such as a capillary viscometer.
2 Reference standards
GB5327 Terminology of surfactants
GB/T13173.1 Method for sampling detergent samples JG215-81 Verification procedure for rotational viscometer (trial) 3 Terms, symbols and units
3.1 Dynamic viscosity (): A measure of the internal friction of a liquid when a liquid layer flows relative to another liquid layer under a certain shear stress. Its value is the ratio of the shear stress (t) applied to the flowing liquid to the shear rate (D), in Pascal seconds (Pa·s) or millipascal seconds (mPa·s) as units!), expressed by Newton's equation:
In the formula; n—dynamic viscosity;
shear stress; www.bzxz.net
-shear rate;
the speed of one liquid layer relative to another; Z -the coordinate perpendicular to the two liquid layers.
Note: 1) The units of dynamic viscosity are Newton·seconds per square meter (N·s/m2), millinewton·seconds per square meter (mN·s/m\), poise (P), centipoise (cP). 1 N·s/m2=1 Pa·s=10 P(poise)=10°cP(centipoise), 1 mN·$/m2=1 mPa·$=1 cP(centipoise). 3.2 Apparent viscosity (7.): The internal friction characteristics of non-Newtonian liquids when they flow under certain shear stress and shear rate. 3.3 Newtonian liquid: A liquid that shows constant viscosity at all shear rates. 3.4 Non-Newtonian liquid: A liquid whose viscosity changes with changes in shear rate or even shear time. 3.5 Rheological phenomena (see Figures 1 and 2).
1994-12-30 approved by the State Bureau of Technical Supervision 296
1995-10-01 implemented
Binwen type
GB/T 15357—94
Newtonian characteristics
Shear thinning
Dilatant
Plasticity
Bingham type
Figure 1 Typical flow law of the system under constant stress (D=(t)) and the system under constant shear rate [t=f(D))
GB/T15357-94
Thixotropy
Anti-thixotropy
Figure 2 Hysteresis curve showing that the rheological characteristics of the product are strongly affected by the length of shear time
The typical rheological phenomena shown in Figures 1 and 2 include: Newtonian characteristics, shear thinning, dilatant, plasticity, thixotropy and anti-thixotropy, and their definitions are shown in GB5327.
3.6 Time-dependent viscosity: Under isothermal reversible conditions, at a constant shear rate, the apparent viscosity changes with time. 4 Principle
Use a specified rotational viscometer to determine the viscosity (\) of Newtonian liquids or the apparent viscosity (na) of non-Newtonian liquids at a specified shear rate.
5 Instruments
5.1 Rotational viscometer: a viscometer with a coaxial cylinder and a flat plate measuring unit, with a measuring range of 1 to 10° mPa·s and a measuring error of ±5% (for Newtonian liquids), such as NDJ-1 and NDJ-79 rotational viscometers. Verify and calibrate the viscometer in accordance with the provisions of JJG215. 5.2 Super constant temperature water bath: can control the temperature at 20~30℃, accurate to 0.2℃. 5.3 Thermometer: graduation 0.1℃.
6 Test procedure
6.1 Test portion
Prepare a uniform laboratory sample carefully in accordance with the provisions of Article 4.3 of GB/T13173.1, and take the test portion from it to ensure that there are no air bubbles at all.
6.2 Selection of rotational viscometer and measuring unit To determine the viscosity of a specific product, the instrument and the selected rotor, the shear rate and time during the measurement should be clearly specified in the specific product standard. These choices depend on the rheological properties of the product (see Figure 1 and Figure 2). a.
The viscosity of Newtonian products is independent of the rotor diameter, shear rate and shear time. A rotor or shear rate with a narrow measuring range should be selected to obtain a more accurate measurement value. GB/T15357—94
b. The apparent viscosity of non-Newtonian products is closely related to the rotor diameter or shear rate and time. Shear thinning, dilatancy, plasticity, thixotropy and anti-thixotropy should be considered. Several diameters of rotors, shear rates and times should be used to test and determine the rheological properties of the product so as to select the appropriate diameter of the rotor, shear rate and time, and whether to use a new test portion or wait for the liquid to recover for a certain period of time when repeating the measurement. 6.3 Determination
Pour the sample to be tested into a thermostatically controlled measuring container, adjust the temperature to the selected temperature, then put the selected rotor into the measuring container and connect it to the rotating shaft, immerse the rotor in the center of the sample, and keep the sample liquid level at the rotor liquid level mark. Prevent the rotor from generating bubbles, and then operate according to the instrument instruction manual.
7 Determination results
The viscosity (n) or apparent viscosity (n) is calculated according to formula (2): or) =·α
Dynamic viscosity of Newtonian sample at the measuring temperature, mPa·s; Where: n--
n. Apparent viscosity of non-Newtonian sample at the measuring temperature, mPa·s; K--coefficient, given by the instrument according to the selected rotor and speed; reading value.
When the power supply frequency is inaccurate, the reading value α should be corrected according to formula (3): reading value ×
8 Test report
The test report should include the following items:
All information required to fully identify the sample; a.
Results and the expression method used;
Nominal frequency
Actual frequency
Experimental temperature, the instrument and rotor used, the speed and reading time; any operation not included in this standard or selected, and the situation that may affect the results. d.
Additional notes:
This standard is proposed by the China Light Industry General Association.
This standard is under the technical coordination of the National Surfactant Detergent Standardization Center. This standard was drafted by the Nanjing Alkylbenzene Factory Research Institute and the Daily Chemical Industry Science Research Institute of the Ministry of Light Industry. The main drafters of this standard are Wu Yusheng, Gao Cuifang and Zhu Chuanjia. (2
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