This standard specifies the method for determining the sieve residue and particle size distribution of vinyl chloride homopolymer and copolymer resins by air jet sieving. These characteristics help to ensure the consistency of feeding and predict processing behavior. GB/T 2916-1997 Plastics--Vinyl chloride homopolymer and copolymer resins--Sieve analysis using air jet sieving device GB/T2916-1997 standard download decompression password: www.bzxz.net

GB/T 29161997
This standard is equivalent to ISO4610-1977 "Plastics-vinyl chloride homopolymer and copolymer resins-Sieve analysis using air jet sieving device". The difference is: the note of Article 7 of ISO4610 adds "If the sieve residue is less than 5%, it is effective to extend the sieving time (to 10 or 15 minutes or more)..." on the sieving time. Based on experimental verification, this standard is changed to: "When determining the particle size distribution, the sieving time can be extended (to 10 or 15 minutes)".
This standard is a revised version of GB2916--82 "Dry sieving test method for polyvinyl chloride resins". Compared with the previous version, the difference is: this standard adopts the air jet method, while the previous version adopts the non-international standard mechanical oscillation method. The sieving machine and operating conditions used are different. This standard replaces GB2916-82 from the date of implementation. This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee on Plastic Standardization (TC15/SC7). The drafting units of this standard are: Jinxi Chemical Research Institute of the Ministry of Chemical Industry, Weifang Yaxing Chemical Group Corporation, and Shanghai Chlor-Alkali Chemical Co., Ltd.
The main drafters of this standard are: An Shaohua, Gong Yixing, Si Yeguang, Du Fengmei, and Li Huiquan. 109
GB/T2916-1997
ISO Foreword
The International Organization for Standardization (ISO) is a worldwide federation of national standards bodies (ISO member bodies). The work of formulating international standards is carried out by ISO technical committees. Any member body interested in a project established by a technical committee has the right to send representatives to participate in the technical committee. International organizations, whether governmental or non-governmental, may also participate in this work by contacting ISO. Draft international standards adopted by technical committees must be voted on and approved by member bodies before being accepted as international standards by the ISO Council. International Standard ISO 4610 was developed by ISO/TC61 Plastics Technical Committee and was sent to member bodies in December 1975. This standard has been adopted by member bodies in the following countries: Austria, Germany, Japan, Romania, Yugoslavia, Belgium, Hungary, Mexico, Spain, Brazil, India, Netherlands, Switzerland, Canada, Iran, New Zealand, Turkey, Czechoslovakia, Ireland, Peru, United Kingdom, Finland, Israel, Poland, United States, France, Italy, Portugal, and Soviet Union.
National Standard of the People's Republic of China
Plastics-Vinyl chloride homopolymer and copolymer resins-Sieve analysis using air-jet sieve apparatus
Plastics-Vinyl chloride homopolymer and copolymer resinsSieve analysis using air-jet sieve apparatus1 Scope
GB/T 2916--1997
eqy ISO 4610: 1977
Replaces GB/T2916-82
This standard specifies the method for determining the sieve residue and particle size distribution of vinyl chloride homopolymer and copolymer resins using air-jet sieve. These characteristics contribute to the consistency of feeding and expected processing behavior. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB6003-86 Test sieve
3 Definition
This standard adopts the following definitions.
Sieve residue: Resin left on the sieve after the test, expressed as a mass percentage. 4 Sample
Take a sufficient amount of resin that is representative and can determine the particle size distribution as the sample. The test should be carried out on the same day. If it cannot be carried out on the same day: it should be stored in a cool and dry sealed container. In order to prevent the tree from having difficulty in sieving due to static electricity, an antistatic agent such as 0.1% of -alumina (for example: Degussa P110CI or powdered activated alumina with a particle size larger than the sieve aperture) can be added at the beginning of the test. 5 Instrument
5.1 Sieve, the diameter of the screen surface is 200mm, the frame and screen are metal, and should comply with the provisions of GB6003. And select the required aperture according to the technical requirements of the resin and the particle size distribution of the resin. Note: The sieve can be cleaned with an ultrasonic cleaning device containing water and detergent, or carefully cleaned with a brush. If it is severely blocked, the sieve can be immersed in tetrahydrofuran for 3 to 4 days, taken out and dried before use.
5.2 Air jet sieve machine (see Figure 1), which consists of a frame with a sieve (5.1), an outlet and an inlet for extracting air at the bottom, and a transparent cover at the top. At the air inlet, close to the bottom of the sieve, there is a grooved rotating nozzle, which blows air through the sieve during rotation to keep the particles suspended. The extracted air carries the fine particles out of the sieve. There is a regulating valve at the air outlet to adjust the working pressure and control the airflow. Approved by the State Administration of Technical Supervision on September 9, 1997, and implemented on February 1, 1998
GB/T 2916-—1997
1 Transparent cover; 2-Sieve; 3-Shell 4-Rotating nozzle; 5-Pressure gauge Figure 1 Schematic diagram of air jet screen
5.3 Timer (or stopwatch), which can indicate minutes and seconds, can be connected to the motor switch of the screening device. 5.4 Balance, with a sensitivity of 0.05g.
6 Operation process
6.1 Install each selected sieve on the sieve machine. 6.2 Weigh 25g of the sample (a small amount of sample, such as 10g, can be taken for resins with finer particles) with an accuracy of 0.1g. Pour it on the sieve and cover it with a transparent cover.
6.3 Adjust the amount of air passing through the sieve machine to achieve a partial vacuum of 2.5kPa. When the sieving machine and vacuum cleaner have been running for 4min±15s, stop them.
For particle size distribution test, the sieving time can be extended to 10 or 15min1). 6.4 Weigh the mass of the sieve residue to an accuracy of 0.1g (the sieve and the sieve residue can be weighed together and then the mass of the sieve can be subtracted). 6.5 Perform a second measurement under the same conditions. Result expression
7.1 The amount of sieve residue is usually expressed as the percentage of sieve residue, calculated using formula (1): Instructions for use:
1) ISO) 4610 stipulates that if the sieve residue is small (for example, the percentage of sieve residue is less than 5%), the sieving time can be extended (to 10 or 15min). However, for reference purposes (especially for naming), the value obtained after 4min±15: should be used. This standard is changed to: "When conducting particle size distribution test, the sieving time can be extended to 10 or 15 min."
Where: R
Sieve residue, %;
The mass of a sample, g;
The mass of the residue on the sieve,.
GB/T 2916—1997bZxz.net
ml×100
The arithmetic mean of the two measured values ​​is taken as the result, rounded to one decimal place. 7.2 Repeatability
For the same sample, when the percentage of the residue is equal to or greater than 5%, the absolute value difference between the results is not greater than 1%; when the percentage of the residue is less than 5%, the absolute value difference is not greater than 0.5%, otherwise it should be re-measured. Until it meets the error requirements. Test report
The test report shall include the following items:
Indicate the use of this standard;
The complete mark of the test resin;
The percentage of residue on each sieve and the percentage passing the finest sieve hole. c)
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