This standard specifies a method for measuring the flow properties of non-solid surfactants using a rotational viscometer with a coaxial cylinder measuring system. This standard applies to single or mixed surfactants, and also to products containing mainly surfactants. GB/T 5561-1994 Surfactants - Method for determining viscosity and flow properties using a rotational viscometer GB/T5561-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Surfactants
Method for determination of viscosity and flow properties by rotational viscometer
Surluce aclive ayents-Deterninallon nf visenkity andCluw propertiesiies uslng a rntatkowal, vlscnmeterCB/T5561—94
Substitute CK5561-85
Standard ReferenceInternational Standard 150388—198Surfactants—Determination of flow properties by rotational viscometer 31 Main content and scope of application
This standard specifies the method for determining the flow properties of non-solid surfactants using a rotational viscometer with a simple measuring system.
This standard is applicable to single or weak surfactants. It is also applicable to products with a main surfactant. 2 Technical General
2.1 Viscosity
The resistance of a flow between two parallel planes subjected to shear, when one plane moves on its own plane under direct load and speed, is called viscosity. The viscosity of a fluid can be expressed by the Newtonian equation: D
Viscosity (dynamic shear stress):
When the viscosity of a fluid is independent of the shear rate at which it is measured, the fluid is considered to be Newtonian. For non-Newtonian fluids, the apparent viscosity value is a function of the shear rate and depends on the thermal and rheological properties of the sample in the instrument. The viscosity is measured in Newtons per cubic meter (N·9/m) or Pascal seconds (Pa). 2.2 Rheological phenomena (see Appendix A and Appendix B) Rheological phenomena are described by a specified shear stress. 2.2.1 Shear thinning
Under constant shear stress, the apparent viscosity decreases with increasing shear rate. 2.2.2 Expansion
Under isothermal reversible conditions, the apparent viscosity increases with the increase of shear rate. 2.2.3 Time-dependent viscosity
Under isothermal reversible conditions, when the shear rate is constant, the apparent viscosity changes with time. 2-2.3-1 Touch
Under isothermal reversible conditions, due to the cold shearing effect, the viscosity decreases from static value (the time of starting shearing) to the final value (depending on the size of the shear rate). When the shear is interrupted, the viscosity stops or recovers within a certain time. This time is called "speed time". 2.2-3.2 Coagulation phenomenon
National Technical Supervision Approved on December 22, 1994
Implementation on October 1, 1995
GB/T 5561-94
The phenomenon that after a high rate of thixotropy is interrupted, the time of thixotropy recovery is shortened by a small rate of thixotropy. 2-2.3.3 Antithixotropy
Under isothermal conditions, the shear action causes the temperature or stiffness to increase from static (the moment before the start of shearing) to the final value (the magnitude of the single-decision drying rate).
When the shear is interrupted, the static temperature is recovered within a certain period of time: this period is called the "thixotropy recovery time". 2.2.3.4 Rheological hysteresis
| Under isotropic reversible conditions, if the shear rate increases linearly with time to a maximum value (the upper curve) and then decreases in the same manner (the lower curve), the shear rate curve can be used to characterize thixotropic or anti-thixotropic properties. 2.2.4 Plasticity
When a plastic body reaches a certain "yield tension limit"; under the action of tension, it behaves like an elastic body, above which it will undergo thixotropic motion. When the shear rate is expressed as a straight line, the gradient D = () (is the shear rate) is expressed as a straight line. ：The material can be said to follow the Bigham model. 3 Principle
The scale represents the force generated by the relative motion of the fluid. When the fluid is flowing, the rotor rotates in the fluid and is subjected to a force that reacts, and the value is proportional to the resistance to the motion of the rotor. The inverse of the scale multiplied by the rotor is the basic value of the dynamic viscosity: Use different shear rates to draw a "shear rate viscosity" (potential shear stress viscosity) curve , or * potential shear stress shear velocity curve describing fluid properties. 4 Reagents and materials
4.1 Dream photo material, known station chasing cattle amount plastic. 5 Instruments
6-1 Rotary viscometer: NJ-?3 type rotary viscometer: or equivalent instrument. Determination needs to buy: 1 unit, the original stator rotor diameter ratio is less than 1.0, 1~0*mPu5
Maximum measurement error: ± 3% (for cattle).
5.2 Constant pressure instrument accuracy 10.
5. 3. Determination procedure 6.1. Carefully collect a sample from the homogenized laboratory sample, ensuring that there are no air bubbles. Place the sample in a thermostatically controlled measuring vessel, adjust the temperature to the new temperature, place the measuring tube in the measuring vessel, turn on the instrument, and read the indicated value after the pointer stabilizes. Perform several tests on the same sample and repeat the test at different shear rates. 6.2. Calibration of the pressure parameter material The method described in 6.1 is used to measure the viscosity of the test material: the standard is a function of the viscosity. The line must pass through the origin. Expression of results 7.1. Curve method (or chart method) The result can be expressed as a line or in the form of a graph with the value of =, [-(or…). Where is the shear rate, is the shear stress, and is the resolution. 7.1.1. Shear force CB/T 5561--94
The shear stress distribution between the inner and outer rings of the shaft is:,
where,
tons of force added by the couple N·blood:
The same rail between the original, m
radius.m.
The shear force of the inner and outer rings and. are respectively given by equations (3) and (4), ·
where: T and! The broad meaning of the same formula (2)
a, m, inner diameter
d, m, outer diameter.
7.1.2 Shear rate
7.1.2.1 Case of high frequency products
When measuring high frequency products, a coefficient can be used to calculate the shear rate. The coefficient value is provided by the instrument manufacturer. The shear rate is given by formula (5).
Where: and are the shear rates of the inner and outer cylindrical walls, respectively, t/min:
and have the same meaning as in equation (3) and equation (4)
7.1.2.2 Case of Newtonian products
When measuring non-Newtonian products, the value obtained by multiplying the frequency by the coefficient of the Newtonian object is equivalent to the "apparent shear rate" expressed by ? , which cannot be expressed as shear rate: 7.1.3 Gauge viscosity
/! -/, the ratio is equivalent to the apparent viscosity, 7.2 At a certain shear rate, the viscosity is expressed as 7 = F.4
Where, .y -…Viscosity.ma·s1
F—rotational velocity
A——scale number.
8Test accuracy
The test error should be less than ±3 (Newtonian body)
9Test report
The test report shall include the following aspects:
9.1 All information required for complete identification of the sample, the complete information of the sample;
All the results and their expression
Test conditions:
Uniformity data of the sample:
Specimen and sample preparation instructions:
Test certificate
GB/T 6561
The designation of the system, the length of the measuring unit used, the ratio of the diameters of the two cylinders and the length of the gap between the cylinders; the shearing procedure, the rotation rate of the cylinder, the test results under each modification, and the total shearing time. 9.5 Whether there are any operating details specified or optional in this standard. And any conditions that may affect the results. a6
GB/T5561—94
Appendix A
Schematic diagram of typical flow law of the case
(supplement)
Absolute
Baghamt
Figure 4 shows the typical flow law of the flow under constant (visible) or fixed (visible) shear rate (GB/T 5561-94bzxZ.net
Schematic diagram of rheological hysteresis curve
(Supplementary information)
The rheological characteristics of the body are shown in the following figure: the rheological curve of the shear stress acting time.
Additional explanation:
GB/T5561-94
The standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Shanghai Dye Research Institute. This standard was drafted by Shanghai Material Research Institute. The main drafters of this standard are Wu Jingmu, Ling Wenting and Xiao Jiao. 48
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