1、Designation: D 3837 95 (Reapproved 2007)Standard Practice forPreparing a Solution of AlkaliSoluble Resins1This standard is issued under the fixed designation D 3837; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、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 practice is a procedure for preparing solutions ofalkali-soluble resins in aqueous ammonia and determining thecharact
3、eristics of such solutions.1.2 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 health practices and determine the applica-bility of regulatory limitations p
4、rior to use.2. Referenced Documents2.1 ASTM Standards:2D 1544 Test Method for Color of Transparent Liquids(Gardner Color Scale)D 2834 Test Method for Nonvolatile Matter (Total Solids)in Water-Emulsion Floor Polishes, Solvent-Based FloorPolishes, and Polymer-Emulsion Floor PolishesE70 Test Method for
5、 pH of Aqueous Solutions With theGlass Electrode3. Summary of Practice3.1 Alkali-soluble resins are dissolved in water by chemi-cally reacting available carboxylic acid sites on the resinmolecule with a base to form water-soluble carboxylate salts.In this practice, the base used is ammonium hydroxid
6、e.4. Significance and Use4.1 This practice is suitable for all types of akalali-solubleresins. The resin manufacturer shall specify the percent am-monium hydroxide to be used (based on the equivalent weightof resin) and the maximum temperature to be used to achievesolution.5. Reagents and Materials5
7、.1 Reaction VesselA three-neck, round-bottom 1000-mLflask of heat-resistant glass.5.2 Thermometer, laboratory grade, partial immersion ther-mometer. Range: from 0 to 230F, 2 divisions; or from 20 to110C, 1 divisions.5.3 Reflux Condenser.5.4 StirrerA motor-driven, variable-speed agitator. Theshaft an
8、d blade shall be of nonreactive material.5.5 Heat SourceElectric heating mantle or gas burner.5.6 Ammonium Hydroxide, reagent grade, 28 to 30 % NH3(26 Baum). This solution shall be refrigerated while instorage.5.7 Distilled Water, or water of equal purity.6. Preparation of Sample6.1 Resin received i
9、n ground or flaked form shall be used asreceived. Select a sample representative of the material undertest.6.2 Resin received in lump form shall be crushed or groundand passed through a 10-mesh screen before testing. Select asample representative of the material under test.7. Procedure7.1 Insert the
10、 reflux condenser into one of the sidearms ofthe flask and support the assembly suitably. Insert the agitatorthrough the center neck and charge the flask with the calculatedamount of ammonium hydroxide and water. Using moderateagitation, slowly add the resin to the contents of the flask.Adjust the a
11、gitator speed as necessary to keep the resinsuspended and moving, but not so fast as to entrain air into thesolution. Heat the solution to the specified temperature within10 min, and maintain this temperature until the solution iscomplete, or for a maximum of 30 min. If the solution is cloudyor hazy
12、 at this point, add additional ammonium hydroxide to1This practice is under the jurisdiction of ASTM Committee D21 on Polishesand is the direct responsibility of Subcommittee D21.02 on Raw Materials.Current edition approved Oct. 1, 2007. Published October 2007. Originallyapproved in 1979. Last previ
13、ous edition approved in 2002 as D 383795 (2002).2Annual Book of ASTM Standards, Vol 06.01.For 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 Summ
14、ary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.clear solution. Total heating time shall not exceed 40 min. Coolthe solution and transfer to a clear, clean glass bottle.NOTE 1Any deviation from this proced
15、ure shall be specified by theresin manufacturer, for example, pre-wetting of resin prior to NH4OHadditive.8. Calculation8.1 Solution weight desired (400 to 700 g suggested) timespercent solids desired equals weight of resin.8.2 Weight of resin times percent ammonium hydroxidespecified equals weight
16、of ammonium hydroxide.8.3 Solution weight minus resin weight minus ammoniumhydroxide weight equals weight of water.8.4 Example400 g of a 15 % solids solution is desired.The specified amount of ammonium hydroxide is 25 % of theweight of the resin. The calculations are as follows:400 g 3 0.15 5 60 g r
17、esin (1)60 g 3 0.25 5 15 g ammonium hydroxide (2)400 g 2 60 g 2 15 g 5 325 g water (3)9. Report9.1 Report the following information:9.1.1 Percent solids of the solution (Test Method D 28344h),9.1.2 Total amount of NH4OH used to prepare the solution,9.1.3 Maximum temperature used,9.1.4 Any undissolve
18、d material, haziness, or cloudiness,9.1.5 Total elapsed time from start of heating until completesolution is achieved or heat is removed, and9.1.6 Final pH of the solution, (Test Method E70).NOTE 2This solution may be used to test color in accordance withTest Method D 1544 or viscosity by any suitab
19、le method, or both.10. Keywords10.1 alkali-soluble; leveling; polish; preparing resin solu-tion; resinASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that de
20、termination 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 andif not revised, either reapproved
21、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, which you may attend. If you feel t
22、hat 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 19428-2959,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).D 3837 95 (2007)2
