GB/T 2794-2022_English: PDF (GB/T2794-2022)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 2794-2022 | English | 110 |
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Determination for viscosity of adhesives
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GB/T 2794-2022
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| GB/T 2794-2013 | English | 239 |
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Determination for viscosity of adhesives -- Single cylinder rotational viscometer method
| Obsolete |
GB/T 2794-2013
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| GB/T 2794-1995 | English | 199 |
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Determination methods for viscosity of adhesives
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GB/T 2794-1995
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| GB 2794-1981 | English | 199 |
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The method for determination of viscosity of adhesives (the method of rotary viscosimeter)
| Obsolete |
GB 2794-1981
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| Standard ID | GB/T 2794-2022 (GB/T2794-2022) | | Description (Translated English) | Determination for viscosity of adhesives | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G38 | | Classification of International Standard | 83.180 | | Word Count Estimation | 10,122 | | Date of Issue | 2022-10-14 | | Date of Implementation | 2023-05-01 | | Older Standard (superseded by this standard) | GB/T 2794-2013 | | Drafting Organization | Shanghai Rubber Products Research Institute Co., Ltd., Beijing Tianshan New Material Technology Co., Ltd., Asahikawa Chemical (Suzhou) Co., Ltd., Shenzhen North Test Testing Technology Co., Ltd., Wellton (Xiamen) Technology Co., Ltd., Changchun Yonggu Technology Co., Ltd. , Shanghai Hansi Industrial Co., Ltd., Kangda New Materials (Group) Co., Ltd., Shanghai Huayi Resin Co., Ltd., Heilongjiang Academy of Sciences Petrochemical Research Institute, Guangzhou Baiyun Chemical Industry Co., Ltd., Wenzhou Huate Hot Melt Adhesive Co., Ltd., Shanghai Plastics Research Institute Co., Ltd., Dongguan Aozhong New Material Technology Co., Ltd., Jiangsu Heisonglin Adhesive Factory Co., Ltd., Xiamen Baianxing New Materials Co., Ltd., Fujian Product Quality Inspection Research Institute | | Administrative Organization | National Adhesive Standardization Technical Committee (SAC/TC 185) | | Proposing organization | China Petroleum and Chemical Industry Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Management Committee | | Standard ID | GB/T 2794-2013 (GB/T2794-2013) | | Description (Translated English) | Determination for viscosity of adhesives. Single cylinder rotational viscometer method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G38 | | Classification of International Standard | 83.180 | | Word Count Estimation | 6,671 | | Older Standard (superseded by this standard) | GB/T 2794-1995 | | Drafting Organization | New Chemical Materials Co., Ltd. Shanghai Kangda | | Administrative Organization | National Standardization Technical Committee Adhesives | | Regulation (derived from) | National Standards Bulletin 2013 No. 10 | | Proposing organization | China Petroleum and Chemical Industry Federation | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies: Determination of the viscosity of the adhesive method uses a single cylinder rotation viscometer method. This standard applies to the determination of liquid adhesive viscosity. | | Standard ID | GB/T 2794-1995 (GB/T2794-1995) | | Description (Translated English) | Determination methods for viscosity of adhesives | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G39 | | Classification of International Standard | 83.18 | | Word Count Estimation | 5,564 | | Date of Issue | 1995/12/20 | | Date of Implementation | 1996/8/1 | | Older Standard (superseded by this standard) | GB 2794-1981 | | Adopted Standard | ASTM D1084-1988, MOD | | Drafting Organization | Shanghai Rubber Products Institute | | Administrative Organization | Shanghai Rubber Products Institute | | Regulation (derived from) | National Standards Bulletin 2013 No. 10 | | Proposing organization | Ministry of Chemical Industry of the People Republic of China | | Issuing agency(ies) | State Bureau of Technical Supervision | | Summary | This Standard specifies using a rotational viscometer and viscosity measuring cup viscosity adhesive methods. The standard method is suitable for rotational viscometer Newtonian fluids or near Newtonian behavior of the adhesive viscosity measurement. The viscosity of this standard applies to 50mL sample cup outflow time adhesive viscosity measurements within 30 ~ 100s. |
GB/T 2794-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.180
CCS G 38
Replacing GB/T 2794-2013
Determination for viscosity of adhesives
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Sampling ... 5
5 Apparatus ... 5
6 Sample conditioning ... 7
7 Test methods ... 7
8 Result representation ... 9
9 Test report ... 9
Determination for viscosity of adhesives
1 Scope
This document describes methods for determination for the viscosity of adhesives using
single cylinder rotational viscometer, cone-plate rotational viscometer, and rotational
rheometer.
This document applies to the determination for viscosity of adhesives.
2 Normative references
The contents of the following documents, through normative references in this text,
constitute indispensable provisions of this document. Among them, for dated references,
only the edition corresponding to that date applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
GB/T 2918 Plastics - Standard atmospheres for conditioning and testing
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 20740 Adhesive - Sampling
3 Terms and definitions
This document does not have terms and definitions that need to be defined.
4 Sampling
Sample sampling shall be carried out in accordance with the provisions of GB/T 20740.
5 Apparatus
5.1 Single cylinder rotational viscometer
Measurement accuracy: ±5%.
5.2 Cone-plate rotational viscometer
Measurement accuracy: ±5%.
6 Sample conditioning
The samples shall be conditioned and tested in the standard conditioning environment
specified in GB/T 2918.
7 Test methods
7.1 Method 1: Single cylinder rotational viscometer method
7.1.1 Principle
A cylindrical or disc-shaped rotor rotates at a constant rate through the sample to be
tested. Measure the torque caused by the viscous drag; combine with the selected speed
and rotor type; obtain the viscosity value of the sample.
7.1.2 Test procedure
7.1.2.1 Add an appropriate amount of the sample to be tested into the sample holder as
needed, to ensure that no air bubbles are introduced. If necessary, use vacuum or other
suitable methods to eliminate air bubbles. If the sample is volatile or hygroscopic,
during the constant-temperature process, it shall seal the sample holder.
7.1.2.2 Select the appropriate rotor and speed, so that the meter reading is within
20%~90% of the maximum range.
7.1.2.3 Make sure that the sample temperature reaches the specified temperature.
Unless otherwise specified, the temperature of the test sample shall be kept at
(23.0±0.5)°C. When conducting arbitration, the thermometer shall be immersed in the
sample, to test the actual temperature of the sample.
7.1.2.4 Start the motor; the rotor rotates in the test sample. After the reading is stable,
record the data. When measuring the viscosity of some adhesives, if the reading
displayed by the instrument is unstable, the viscosity value should be read at a specified
time, such as 15 min. The time can also be determined through negotiation between the
two parties.
7.1.2.5 After each test, remove the rotor from the instrument. Use a solvent, which can
completely dissolve the sample, to carefully clean the rotor and cylinder.
7.1.2.6 Take two samples for parallel test, until the difference between the readings of
two consecutive sample tests is less than 3%. The result is the average of two
measurements.
7.2 Method 2: Cone-plate rotational viscometer method
7.2.1 Principle
Place the sample to be tested between the rotor and the plate. When the rotor rotates,
measure the torque caused by the viscous drag; combine with related parameters such
as the selected rotational speed and the diameter and angle of the rotor; obtain the
viscosity value of the sample.
7.2.2 Test procedure
7.2.2.1 According to the sample, select the appropriate instrument model, rotor and
speed; so that the instrument reading is within 10%~90% of the maximum range.
7.2.2.2 Make sure the viscometer is at the temperature required for the determination.
7.2.2.3 Zero the instrument.
7.2.2.4 Set the cone-plate gap.
7.2.2.5 According to the viscosity and thixotropy of the adhesive and the requirements
of the rotor, take an appropriate amount of the sample to be tested; place it in the center
of the plate; to ensure that the space between the rotor and the plate is filled with
adhesive. There shall be no excessive adhesive overflow. At the same time, ensure that
no air bubbles are introduced.
7.2.2.6 Wait for a period of time for the sample temperature to reach thermal
equilibrium, to ensure that the sample temperature is within the specified range. Unless
otherwise specified, the temperature of the test sample shall be kept at (23.0±0.5)°C.
7.2.2.7 Start the rotor. After the reading is stable, record the data.
7.2.2.8 After each test, use a solvent, which can completely dissolve the sample, to
carefully clean the rotor and plate.
7.2.2.9 Take two samples for parallel test, until the difference between the readings of
two consecutive sample tests is less than 3%. The result is the average of two
measurements.
7.3 Method 3: Rotational rheometer method
7.3.1 Principle
Apply strain (stress) to the rotor to test. According to the shear rate and shear stress,
measure the viscosity of the sample under the corresponding temperature conditions.
7.3.2 Test procedure
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GB/T 2794-2013
Determination for viscosity of adhesives. Single cylinder rotational viscometer method
ICS 83.180
G38
National Standards of People's Republic of China
Replacing GB/T 2794-1995
Determination of the viscosity of the adhesive
Single cylinder viscometer method
Issued on. 2013-07-19
2013-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard replaces GB/T 2794-1995 "Determination of the viscosity of the adhesive," compared with the GB/T 2794-1995, the main technical change
as follows.
--- Standard name was changed to "adhesive viscosity measurement single cylinder rotational viscometer Law";
--- Remove the determination of the viscosity cup.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee adhesive (SAC/TC185) centralized.
This standard was drafted. Hai Kangda New Chemical Materials Co., Ltd., Shanghai Institute of Rubber Products, Nanhai, Foshan City tyrants of chemical
Products Co., Ltd.
The main drafters of this standard. Hu Hongmei, Hou Yibin, Liu Zhenglong, Xu Ning, Lin Huayu.
This standard previously issued as follows.
--- GB/T 2794-1995.
Determination of the viscosity of the adhesive
Single cylinder viscometer method
1 Scope
This standard specifies the determination of the viscosity of the adhesive using a single cylinder viscometer METHOD.
This standard applies to the determination of the viscosity of the liquid adhesive.
Principle 2
Cylindrical or disc-shaped rotor in the sample at a constant rate of rotation, due to the viscosity of the sample run of the rotor resistance guide
Organic produce viscous torque, the elastic member deflecting torque is generated when the viscous torque and torque balance deflection by measuring the deflection of the elastic element
Angle calculating viscosity samples to be tested.
NOTE. Single cylinder rotational viscometer measured viscosity is dynamic viscosity for non-Newtonian fluids, shear stress and shear rate is not a linear relationship between viscosity and shear rate
Rate. Viscosity value measured at a particular rotor speed is called "apparent viscosity", which viscosity measurement is called "relative measurement."
3 instruments and equipment
3.1 Single cylinder rotational viscometer. Schematic diagram of Figure 1 and Figure 2, cylindrical or disc-shaped structure with a rotor is shown in Figure 3.
3.2 thermostatic bath. to maintain at a predetermined measuring temperature ± 0.5 ℃, if desired measured at higher temperatures, it is recommended between the rotor and the instrument
Install the connecting rod.
3.3 Thermometer. indexing is 0.1 ℃.
3.4 container. low-profile or beaker containing the sample, a standard size for the nominal capacity of 600mL, the outer diameter (90.0 ± 2.0) mm, full-height (125.0 ±
3.0) mm and a minimum wall thickness of 1.3mm.
1 mechanical single cylinder rotational viscometer Schematic
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