ASTM E2408-2004 Standard Test Method for Relative Extensional Viscosity of Agricultural Spray Tank Mixes《农用喷雾箱混合料的相对拉伸粘度的标准试验方法》.pdf
《ASTM E2408-2004 Standard Test Method for Relative Extensional Viscosity of Agricultural Spray Tank Mixes《农用喷雾箱混合料的相对拉伸粘度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E2408-2004 Standard Test Method for Relative Extensional Viscosity of Agricultural Spray Tank Mixes《农用喷雾箱混合料的相对拉伸粘度的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E 2408 04Standard Test Method forRelative Extensional Viscosity of Agricultural Spray TankMixes1This standard is issued under the fixed designation E 2408; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the relativeextensional viscosity or Screen Factor (SF) of dilute agricul-
3、tural spray mixes.1.2 The test can be used for tank mixes containing dis-solved, emulsified or dispersed materials, or mixtures.1.3 Results may be affected by the quality of the water used.Make-up water quality should therefore be specified in thepresentation of results.1.4 Proper safety and hygiene
4、 precautions must be takenwhen working with pesticide formulations to prevent skin oreye contact, vapor inhalation, and environmental contamina-tion. Read and follow all handling instructions for the specificformulation and conduct the test in accordance with goodlaboratory practice.NOTE 1References
5、 to the development of extensional viscosity fromdissolved polymers, extensional viscosity effects on the droplet sizedistribution of sprays, and measurements of screen factor on recirculatedspray mixes containing polymers are available2,3.1.5 This standard does not purport to address all of thesafe
6、ty concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:4D 1193 Specifications for Reagen
7、t WaterE 609 Terminology Relating to PesticidesE 1116 Test Method for the Emulsification Characteristicsof Pesticide Emulsifiable Concentrates2.2 CIPAC Documents:CIPAC Monograph 1 (Instructions for the preparation ofhard water)CIPAC Method MT 18.1.1 to 18.1.7 (Instructions for thepreparation of stan
8、dard waters)3. Terminology3.1 Definitions:3.1.1 screen factor, (SF)the ratio of the flow time of a testfluid (tp) to the flow time of water (tw) through the screenviscometer apparatus.3.1.2 extensional viscosity, (E)a measure of the resistanceof a fluid to distortion by a stretching force.4. Signifi
9、cance and Use4.1 Extensional viscosity is a measure of the resistance of aliquid to stretching forces, such as those occurring during thedisruption of liquid films and the formation of sprays used inagriculture and other purposes including painting operations ormetal working. This method for measure
10、ment of a ScreenFactor, gives a relative value for extensional viscosity, whichmay be used:4.1.1 To compare the potential for drift control of differentpolymers.4.1.2 To compare the relative extensional viscosity compo-nent of different spray tank mixtures.4.1.3 To determine the extent of breakdown
11、of polymersolutions used as drift control additives during the recirculationof the solutions through pumps and screens.4.1.4 To use as a parameter in the Spray Drift Task ForceModels for droplet size prediction.4.2 It should also be noted that many drift control polymersare irreversibly destroyed du
12、ring the recirculation of spraymixes by pumping with high shear pumps such as gear orcentrifugal pumps. It is advisable to subject the test mixture tosimilar pumping regimes to simulate practical conditionsbefore carrying out the extensional viscosity test. Measure-ments of extensional viscosity are
13、 the only presently known1This test method is under the jurisdiction of ASTM Committee E35 onPesticides and Alternative Control Agents and is the direct responsibility ofSubcommittee E35.22 on Pesticide Formulations and Delivery Systems.Current edition approved Oct. 1, 2004. Published November 2004.
14、2Dexter, R. W.,Measurements of Extensional Viscosity of Polymer Solutions andits Effect on Atomization from a Spray Nozzle,” Atomization and Sprays, 6, 1996,pp. 167-1913Zhu, H., Dexter, R. W., Fox, R. D., Reichard, D. L., Brazee, R. D., and Okzan,H. E.,“Droplet Size and Viscosity Effects in Recircul
15、ated Polymer Spray Solutions,”J. Agric. Engr. Res., 67, 1997, pp. 35-454For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe AST
16、M website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.method of determining the extent of this breakdown propertiesof dilute polymer solutions.4.3 This method is intended to produce a relative value forextensional viscosity. The
17、purpose of the method is to comparethe extensional viscosity produced by different polymer typesor concentrations of polymer in spray tank mixes.5. Apparatus5.1 List of Materials for Construction of Screen Viscometer:5.1.1 Item 1Fluorinated plastic14 in. (0.635 cm) straightunion, reference SKU-II4,
18、P#D1O77019. Norton PerformancePlastics, 150 Dey Road, Wayne, New Jersey, 07470, USA.5.1.2 Item 2Cut five (5)14 in. diameter discs (see 5.2)from 100 mesh (150 m aperture) USA Standard Testing Sieve,ASTM E 11 specification, stainless steel plain weave screen, soas to fit tightly into the14 in. plastic
19、 union.5.1.3 Item 3Glass 25 mL pipette, VWR catalog #7102(1999) or equivalent. External diameter of the tube below thebulb of the pipette = 0.82 cm. Cut off the lower part of thepipette at a point 2.5 cm below the bulb. Round off the sharpedges of the tube with a flame.5.1.4 Item 4Silicone rubber tu
20、bing, flexible, for use as asleeve to join a glass tube (Item 5) to the lower end of thepipette (Item 3).5.1.5 Item 5Glass tube, cut froma2mLpipette, Kimax#37000, or equivalent (American Scientific catalog #P4140-2).Dimensions of tube are: length = 3 cm; outside diameter = 0.62cm. Round off the shar
21、p ends of the tube in a flame.NOTE 2Appropriate safety precautions should be taken when using anopen flame for rounding the ends of the glass tubes.5.2 Assembly of Screen ViscometerRefer to Fig. 1, whichshows the arrangement of the separate items of equipment, andFig. 2, which shows the placement of
22、 the screen pack in theplastic union.5.2.1 Push the five stainless screen discs, one at a time, intothe14 in. (0.635 cm) plastic union. Push each screen down tothe central lug in the union, using a piece of14 in. glass tubing.Ensure that the last of the 5 screens fits tightly into the plastictube to
23、 keep the pack of screens well compacted and fixed inplace.5.2.2 Push the silicone rubber sleeve (Item 4) on to thelower end of the pipette tube (Item 3). Leave approximately 0.8cm of the silicone tube projecting beyond the glass.5.2.3 Push the short glass tube (Item 5) into the plastic unionfirmly
24、and press down on the pack of screens. Screw on the endcap of the union to retain the position of the screen pack.Ensure that the Teflon cone supplied with the union is fittedproperly, to provide a leak tight seal. About 0.6 cm of the glasstube should protrude from the end cap of the union.5.2.4 Pus
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