ASTM D1823-1995(2009) Standard Test Method for Apparent Viscosity of Plastisols and Organosols at High Shear Rates by Extrusion Viscometer《用挤压粘度计测定高剪切率下塑料溶胶和有机溶胶的表观粘度的标准试验方法》.pdf
《ASTM D1823-1995(2009) Standard Test Method for Apparent Viscosity of Plastisols and Organosols at High Shear Rates by Extrusion Viscometer《用挤压粘度计测定高剪切率下塑料溶胶和有机溶胶的表观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 D1823-1995(2009) Standard Test Method for Apparent Viscosity of Plastisols and Organosols at High Shear Rates by Extrusion Viscometer《用挤压粘度计测定高剪切率下塑料溶胶和有机溶胶的表观粘度的标准试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D1823 95 (Reapproved 2009)Standard Test Method forApparent Viscosity of Plastisols and Organosols at HighShear Rates by Extrusion Viscometer1This standard is issued under the fixed designation D1823; the number immediately following the designation indicates the year oforiginal adoption
2、 or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the measurement of plastisoland organosol viscosity
3、at high shear rates by means of anextrusion viscometer.1.2 Apparent viscosity at low shear rates is covered in TestMethod D1824.1.3 The values stated in SI units are to be regarded asstandard. The values in parentheses are given for informationonly.1.4 This standard does not purport to address the s
4、afetyconcerns associated with its use. It is the responsibility of theuser of this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.NOTE 1This test method resembles ISO 4575-1985 in title only. Thecontent is signific
5、antly different.2. Referenced Documents2.1 ASTM Standards:2D1475 Test Method For Density of Liquid Coatings, Inks,and Related ProductsD1755 Specification for Poly(Vinyl Chloride) ResinsD1824 Test Method forApparent Viscosity of Plastisols andOrganosols at Low Shear RatesE1 Specification for ASTM Liq
6、uid-in-Glass ThermometersE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 4575-1985 Poly Vinyl Chloride PastesDetermination of Apparent Viscosity Using the SeversRheometer33. Summary of Test Method3.1 The sample is conditioned to th
7、e proper temperature,placed into an extrusion chamber, and extruded under standardconditions. The viscosity is calculated from the extrusionpressure and the rate of flow through the orifice.4. Significance and Use4.1 The suitability of a dispersion resin for any givenapplication is dependent upon it
8、s viscosity characteristics.4.2 The extrusion viscosity defines the flow behavior of aplastisol or organosol under high shear. This viscosity relates tothe conditions encountered in mixing, pumping, knife coating,roller coating, and spraying processes.5. Apparatus5.1 Extrusion Rheometer.45.2 Orifice
9、, 3.17 6 0.13 mm (0.125 6 0.005 in.) insidediameter and 50 6 1.0 mm (1.97 6 0.04 in.) long.5.3 Sample Containers, Tin Cans, or Glass Jars, 1-pt(500-mL) capacity.5.4 Paper Cups, 8-oz (250-mL) capacity.5.5 Nitrogen Cylinder, equipped with pressure regulator andgage.5.6 ThermometerASTM Solvents Distill
10、ation Thermom-eter having a range from 2 to +52C (28 to 126F) andconforming to the requirements for Thermometer 37C asprescribed in Specification E1. Use of temperature measuringdevices such as liquid-in-glass thermometers, thermocouples,or platinum resistance thermometers having equivalent orbetter
11、 accuracy and precision, while covering the temperaturerange of Thermometer 37C shall be permitted.5.7 Timer.6. Conditioning6.1 Maintain the plastisol or organosol samples at 236 1C(73 6 2 F) and 50 6 5 % relative humidity at all times aftermixing and throughout the period of viscosity determination
12、s.1This test method is under the jurisdiction ofASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materials(Section D20.15.08).Current edition approved Oct. 1, 2009. Published January 2010. Originallyapproved in 1961. Last previous edition approve
13、d in 2001 as D1823 95 (2001).DOI: 10.1520/D1823-95R09.2For 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 ASTM website.3Availa
14、ble from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4The sole source of supply of the Burrell Severs, Model A-120 known to thecommittee at this time is Burrell Corp., 2223 Fifth Ave., Pittsburgh, PA 15219. Ifyou are aware of alterna
15、tive suppliers, please provide this information to ASTMInternational Headquarters. Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-
16、2959, United States.7. Procedure7.1 Set Up RheometerAttach the pressure regulator to thenitrogen tank. Connect the nitrogen supply to the rheometer bymeans of the copper tubing. Do not use oxygen or liquidpressure sources (Note 2). Set the three-way quick-acting valveto the IN position. Regulate the
17、 tank pressure to give 1.04 MPa(150 psi) pressure to the instrument. Do not use input or linepressure over 1.38 MPa (200 psi). Insert the medium-sizeorifice (approximately 3.2 mm (18 in.) inside diameter) in theorifice retaining cap, with the orifice and the barrel, then screwthe cap solidly in plac
18、e. Mount the barrel in the instrument.NOTE 2Air may be used instead of nitrogen.7.2 Weigh four empty paper cups for each sample to betested. Record tare weight of each cup to the nearest 0.1 g. Fillthe barrel with the sample to be tested to within 13 mm (12 in.)from the top of the barrel. Measure th
19、e sample temperature.7.3 Insert the top air cap and gasket into the air cap ring,screw it in place on top of the barrel, and connect the air supplyquick-connector.7.4 Set the rheometer regulator gage (on the right side of theinstrument) to 0.069 MPa (10 psi) pressure. Open the three-way quick-acting
20、 valve to the OUT position and allow the mixto extrude into an unweighed paper cup for 10 s. Adjust thegage pressure back to 0.069 MPa (10 psi).7.5 Quickly place a preweighed and labeled paper cup underthe nozzle and at the same time start the timer. Collect theextrudate until approximately 50 g of
21、sample have entered thecup. Simultaneously remove the cup and stop the timer, againplacing the unweighed cup under the nozzle. (Use a maximumflow time of 200 s for extremely viscous samples.)7.6 Push the three-way quick-acting valve to the IN positionto turn off the nitrogen supply to the chamber.7.
22、7 Record the extrudate weight to the nearest 0.1 g andefflux time to the nearest second.7.8 Increase the gage pressure to 0.28 MPa (40 psi) andrepeat 7.4-7.7. Increase to 0.48 MPa (70 psi) and repeat. Makea fourth determination at 0.69 MPa (100 psi). Report the exactefflux time for each determinatio
23、n. After all tests have beencompleted, turn off the nitrogen supply at the tank. Release thepressure in the instrument by pulling the three-way valve to theOUT position.7.9 Clean the orifice between runs using pipe cleaners thathave been wetted with mineral spirits. Take care that the innersurface o
24、f the orifice does not become scratched. After rinsingwith mineral spirits, dry the orifice in air.8. Calculation8.1 Calculate the shear stress, shear rate, and viscosity asfollows:Shear stress, MPa or psi!5PR/2L (1)where:P = pressure in rheometer, MPa (or psi),R = radius of orifice, cm (in.), andL
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