1、Designation: D5166 97 (Reapproved 2016)Standard Practice forLaboratory Preparation of Gelled Vehicle Samples Using aMicrowave Oven1This standard is issued under the fixed designation D5166; the number immediately following the designation indicates the year oforiginal adoption or, in the case of rev
2、ision, 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 practice outlines a procedure for preparing gelledvehicle samples using a microwave oven.1.2 T
3、he test samples can be used for characterizing thegelability or reactivity of resins, gelling agents, and vehiclesused in the manufacture of oil based printing inks, or both.1.3 Evaluation of the gelled vehicles may, depending uponpreference, be either visual or instrumental.1.4 The values stated in
4、 SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and heal
5、th practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D154 Guide for Testing VarnishesD1545 Test Method for Viscosity of Transparent Liquids byBubble Time MethodD1725 Practice for Preparing Resin Solutions for ViscosityMeasure
6、ment by Bubble Time MethodD4040 Test Method for Rheological Properties of PastePrinting and Vehicles by the Falling-Rod ViscometerE1 Specification for ASTM Liquid-in-Glass Thermometers3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 gel, nAny resin solution, or more complex ble
7、nd ofresins and alkyds that has been cooked or reacted with a gellingor cross-linking agent to build molecular weight and thatexhibits a pseudoplastic rheology. (Also called “gelled ve-hicle.”)3.1.2 gelling agent, nin the context of ink resins andvehicles, gelling agents or gellants are typically or
8、gano-aluminum compounds that react with carboxylic acid andhydroxyl groups present on the backbone of resins and alkydsto form cross-linked networks. (Also called “gellant.”)3.1.3 gel length, nReferences to long, medium, and shortgel length refer to the length of a string of gelled vehicleobserved w
9、hen pulling apart a small sample of vehicle with aspatula (that is, a long gel is very fluid and forms a “long”filament; a short gel has little flow and forms a “short”filament).3.1.4 pregel, nThe resin solution or vehicle componentscomprising the vehicle prior to the addition of gelling agentand vi
10、scosity adjusting solvent. (Also called “pregel vehicle.”)4. Summary of Practice4.1 Prepare a pregel resin solution or vehicle.4.2 Separate the pregel vehicle into five or more aliquots towhich various levels of gellant are added. Alternately, variousgellants can be added at a given concentration to
11、 compare theireffectiveness.4.3 Place the test samples on a turntable in the microwaveoven and heat the samples at full power until the desired testtemperature is attained.4.4 After the prescribed waiting period, test and ratesamples for gelability.5. Significance and Use5.1 This practice provides a
12、 means of preparing a number ofgel vehicle samples with minimum use of materials and time.It provides a means of quickly characterizing and comparingthe gelability or reactivity of resins, vehicles, and gellingagents.6. Apparatus6.1 Mercury Thermometer, capable of reading from 0 to250C and conformin
13、g to Specification E1.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.37 on Ink Vehicles.Current edition approved April 1, 2016. Published April 2016. Originallyapproved in 19
14、91. Last previous edition approved in 2008 as D5166 97 (2008)1.DOI: 10.1520/D5166-97R16.2For 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 Summa
15、ry page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 Jars, (40 mm in diameter by 83 mm in height), 70 cm3with nonmetallic screw-on lids.6.3 Microwave Oven, common 750-watt.36.4 Microwave Oven Carousel, if not
16、 contained in themicrowave oven.6.5 Glass Dish, 15.2 cm in diameter.6.6 Balance or Scale, capable of weighing to 60.1 gaccuracy.6.7 Ink Knife or Rigid Spatula.6.8 Rheology Testing Apparatus, at the discretion of theuser.7. Reagents and Materials7.1 Nonvolatile materials including resins, alkyds, gel
17、lants,etc., consistent with those used in the manufacture of litho-graphic ink vehicles, for example, aromatic hydrocarbonresins, modified rosin ester resins, long oil linseed isophthalicalkyds, and aluminum compounds.7.2 Solvents typically used in the manufacture of litho-graphic ink vehicles, for
18、example, hydrocarbon petroleumdistillate with carbon numbers in the range of C12 to C16 andinitial boiling point above 150C.8. Procedure8.1 Place 45 g (or the calculated weight) of previouslyprepared pregel vehicle into each of five or more 70-cm3bottles.NOTE 1Any vehicle, even a very complex formul
19、ation, without thegellant added may be used as the pregel vehicle portion for the microwaveoven gelability process.8.1.1 In the absence of a vehicle formula agreed uponbetween user and seller, the following test vehicle formula issuggested:4,5PartsPregel VehicleResin 35Alkaline refined linseed oil (
20、ARLO) 30C12-C16 hydrocarbon petroleum distillate 2590Gellant/Solvent Addition33.3 % oxyaluminum octoate/66.7 % C12-C16 hydrocarbonpetroleum distillate101008.2 Estimate the amount of gellant required to make anacceptable gel vehicle. Add gellant solution (between 30 and50 % gellant in major vehicle s
21、olvent recommended) in 1 %increments plus additional solvent to adjust the vehicle to a100 % formula. If the amount of gellant required can not beestimated, use a larger range of gellant concentration.8.2.1 If using the pregel formula as just recommended, therequired amount of gellant can be estimat
22、ed from Table 1.8.2.2 A sample containing no (0 %) gellant solution isalways prepared as the standard for each resin.8.3 Mix the added liquids into the pregel very well using anink knife or rigid spatula.8.4 Place the five sample bottles, without tops, into the15.2-cm glass dish and place on the car
23、ousel in the microwaveoven.8.5 Turn on the carousel and ensure that it is turning beforestarting the heating cycle. Turn on the light in the oven toobserve the process.8.6 Set the timer on the oven for “5.00” min and start thecooking cycle.8.7 Upon completion of the cooking cycle, check thetemperatu
24、re of the samples to determine whether a temperatureof 105 to 110C was obtained. If not, continue the heatingcycle in 1-min intervals until the samples have reached thistemperature.8.8 Remove the samples from the microwave oven, andallow to cool.8.9 Seal cooled samples with jar lids.NOTE 2If more th
25、an one set of samples is to be run, allow themicrowave oven to cool between runs. Heat is retained in the oven and ifa second set of samples is run immediately it will be subjected to moreheat than the first set.9. Evaluation9.1 Samples should be tested immediately after preparationand after 24 h to
26、 determine the effects of post gelation, if any.9.2 Guide D154 outlines many methods applicable to thetesting of varnishes. It is an excellent guide for those lookingfor specific areas of evaluation.9.3 Lightly gelled resin solutions and vehicles can be testedfor changes in viscosity by using either
27、 Test Method D1545 orD1725. These test methods both use Gardner bubble tubes todetermine the viscosity of liquids.3Any common microwave oven, available at most appliance stores, can be used.A 750watt oven with a builtin turntable is preferred. Ovens with lower power willrequire adjustments in the te
28、st cycle.4This formula works best with higher molecular weight ink resins (for example,phenolic modified rosin esters). It is suggested that the resin solids be increased forlow molecular weight resins (for example, simple rosin esters, modifiedhydrocarbons, etc).5When a resin is insoluble, reformul
29、ate replacing 5 parts of C12-C16 hydrocar-bon petroleum distillate with TXIB (2,2,4-trimethyl-1,3-pentanediol, diisobutyrate)or TDA (tridecyl alcohol). Caution: TDA may hinder the reactivity of the resinsystem tested.TABLE 1 Microwave Gelability Test, Weights and Concentrationsfor 50-g SamplesGellan
30、tSolution, %Actual GellantConcentration, %Weight GellantSolution, gA(at 33.3 %Gellant in Ink Oil)Weight Ink Oil, gA0 0.00 0.0 5.01 0.33 0.5 4.52 0.67 1.0 4.03 1.00 1.5 3.54 1.33 2.0 3.05 1.67 2.5 2.56 2.00 3.0 2.07 2.33 3.5 1.58 2.67 4.0 1.09 3.00 4.5 0.510 3.33 5.0 0.0AWeight added to 45-g pregel s
31、ample.D5166 97 (2016)29.4 Another test method for testing gelled ink vehicles isTest Method D4040. This method utilizes a falling-rod viscom-eter and can be used to determine the non-Newtonian nature ofvehicles. Other viscometers used for determining the rheologyof gelled vehicles include variable s
32、hear rate viscometers andcone and plate viscometers.9.5 For the trained analyst the occurrence of gelation isevident and gels can be rated visually (for example, long,medium, medium short, short gel body).10. Report10.1 Report the following information:10.1.1 Sample identification,10.1.2 Test run,10
33、.1.3 Brief summary of procedure,10.1.4 Conditions of test procedure, and10.1.5 Results of the analyses made. In the case of fallingrod viscometer determinations, the following data could beobtained using Test Method D4040 (see also the ApparatusSection of this test method):10.1.5.1 Apparent viscosit
34、y at 2500 at 25C, s,10.1.5.2 Pseudo-Bingham Yield value at 25C,10.1.5.3 Shortness ratio (yield value/viscosity), and10.1.5.4 Slope (non-Newtonian parameter).NOTE 3For a measurement of relative resin, vehicle, or gellantreactivity, lots of rheology versus gellant concentration (see Fig. 1)provide an
35、excellent comparison.NOTE 4Falling rod viscosity slope (non-Newtonian parameter), short-ness ratio, and visual degree of shortness, if used properly, are all suitablemeasures of rheology.11. Keywords11.1 gel; gelability; gelled varnish; gelled vehicle; micro-wave oven; non-Newtonian fluid; pregel; p
36、regel varnish; pregelvehicle; shortness ratio; slope; yield valueFIG. 1 Determination of Lithographic Ink Resin GelabilityD5166 97 (2016)3ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this st
37、andard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years a
38、ndif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee,
39、 which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-29
40、59,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 97 (2016)4
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