HG/T 2298-2001 Determination of sedimentation of aqueous dispersions of rubber compounding agents HG/T2298-2001 Standard download decompression password: www.bzxz.net

Record number: 10143-2002
HG/T2298--2001
This standard is a revision of the recommended chemical industry standard HG/T2298--1992 "Determination of Sedimentation of Rubber Compounding Aqueous Dispersion".
The main technical differences between this standard and HG/T2298--1992 are: the determination method in HG/T2298--1992 is revised to method A, and method B is added. 1. The sampling time provision of method A is added, that is, it is clearly stipulated that sampling should be taken immediately after grinding. From the date of implementation, this standard will replace HG/T2298--1992. This standard was proposed by the Policy and Regulations Department of the former State Administration of Petroleum and Chemical Industry. This standard is under the jurisdiction of the Latex Products Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products. The drafting unit of this standard: Zhuzhou Rubber and Plastics Industry Research and Design Institute of China Rubber Group. The main drafters of this standard are Zhang Yu, Cao Qijian and Li Meihui. This standard was first issued in 1992.
Chemical Industry Standard of the People's Republic of China
Determination of sediment of aqueous dispersion-Rubbercompoundingmaterial
1 Scope
This standard specifies the determination method of sediment of aqueous dispersion-Rubbercompoundingmaterial. This standard is applicable to aqueous dispersion of rubber compounding material. 2 Referenced standards
HG/T2298—2001
Replaces HG/T2298—1992
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. HG/T2299--2001 Determination of total solid content of rubber compound aqueous dispersion 3 Definitions
This standard adopts the following definitions:
Sedimentation
is the mass of particles of rubber compound aqueous dispersion that settle on the sedimentation plate under specified conditions, in milligrams (mg). 4 Principle of the method
Particles of the same density and different sizes in the suspension perform a hook-speed sedimentation motion under the combined action of gravity, buoyancy and viscous resistance. The sedimentation velocity of the particles conforms to Stokes' law, that is, the sedimentation velocity is proportional to the square of the particle diameter. The mass of the particles that settle on the plate can be weighed by hanging the sedimentation plate at one end of the balance beam, that is, the sedimentation amount. The size of the sedimentation amount reflects the stability of the particles and the dispersion. 5 Test steps
5.1 Method A
5.1.1 Instrumentswww.bzxz.net
5.1.1.1 Sedimentation balance: sensitivity 0.002g: automatic recording range 0～0.5mm, with automatic balancing and automatic recording devices. 5.1.1.2 Sedimentation plate: stainless steel, diameter (53±1)mm, vertical height of the edge 3mm, a stainless steel wire with a hook connected to the center of the circle perpendicular to the disk, diameter 2mm, length 340mm (see Figure 1). 5.1.1.3 Sedimentation tube: glass, height 310mm, inner diameter 56.6mm, with circulating water jacket (see Figure 1). 5.1.1.4 Super constant temperature water bath: accuracy is ±1℃. 5.1.1.5 Platform scale: sensitivity 1g.
Approved by the State Economic and Trade Commission on January 24, 2002, and implemented on July 1, 2002
5.1.2 Sample preparation
HG/T2298-2001
Figure 1 Sedimentation part
5.1.2.1 Sampling: After grinding, immediately stir the dispersion evenly, take an appropriate amount of sample, filter it through two layers of 80 nylon cloth, place it in a dry, clean ground-mouth wide-mouth bottle, cover it and wait for testing. 5.1.2.2 Storage time: Samples must be used within 24 hours. 5.1.2.3 Preparation of sedimentation liquid: Determine the total solid content of the dispersion according to the provisions of HG/T2299, and then adjust the total solid content of the sample to (5±0.2)% with distilled water.
5.1.3 Test steps
5.1.3.1 Hang the sedimentation tray and carefully add the sedimentation liquid into the sedimentation tube, so that the distance between the liquid surface and the sedimentation tray is 200mm to avoid bubbles.
5.1.3.2 Connect the sedimentation tube jacket to the super constant temperature water bath to stabilize the sedimentation liquid temperature at (30±1)℃. 5.1.3.3 Move the sedimentation tray up and down in the sedimentation tube 1015 times. After the sedimentation liquid is uniform, quickly hang the sedimentation tray on the ear of the balance, turn on the balance, adjust the balance to a balanced state, and start the measurement. When the measurement reaches 30min, read the sedimentation amount in milligrams (mg). 5.2 Method B
5.2.1 Instrument
5.2.1.1 Torsion balance: sensitivity 0.01g. 5.2.1.2 Constant temperature oven, glass slide.
5.2.1.3 Specimen bottle: 55mmX550mm.
5.2.1.4 Aluminum (iron) sedimentation plate: area (10±0.5)cm. 5.2.1.5 Stopwatch, wide-mouth thermos bottle, etc.
5.2.2 Sample preparation
5.2.2.1 Sampling: After grinding, immediately stir the dispersion evenly, take an appropriate amount of sample, filter it through two layers of 80-mesh nylon cloth, put it in a special sample bottle, cover it, and label it. 5.2.2.2 Storage time: Samples must be used within 24 hours. 5.2.2.3 Preparation of sedimentation liquid: Determine the total solid content of the dispersion according to the provisions of HG/T2299, and then adjust the total solid content of the sample to (20±0.5)% with distilled water.
5.2.3 Test steps
5.2.3.1 Stir the sedimentation liquid at a high speed for 3 to 5 minutes, weigh 380g of the sedimentation liquid, and put it in the specimen bottle, taking care to avoid bubbles. 5.2.3.2 Hang one end of the sedimentation plate under the weighing rod of the torsion balance, and adjust the height of the thermos bottle so that the distance from the sedimentation plate to the liquid surface is 10cm. 5.2.3.3 According to the different requirements of the dispersion, record the reading of the torsion balance at regular intervals in milligrams (mg). 6 Test report
The test report should report the following:
a. The standard based on;
b. The name, number and sampling time of the sample; c. The test results;
d. The tester.
HG/T2298—2001
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