ASTM D3837-95(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D3837 − 95 (Reapproved 2019)
Standard Practice for
Preparing a Solution of Alkali–Soluble Resins
This standard is issued under the fixed designation D3837; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This practice is a procedure for preparing solutions of 4.1 This practice is suitable for all types of akalali-soluble
alkali-soluble resins in aqueous ammonia and determining the resins. The resin manufacturer shall specify the percent am-
characteristics of such solutions. monium hydroxide to be used (based on the equivalent weight
of resin) and the maximum temperature to be used to achieve
1.2 The values stated in SI units are to be regarded as
solution.
standard. No other units of measurement are included in this
standard.
5. Reagents and Materials
1.3 This standard does not purport to address all of the
5.1 Reaction Vessel—A three-neck, round-bottom 1000-mL
safety concerns, if any, associated with its use. It is the
flask of heat-resistant glass.
responsibility of the user of this standard to establish appro-
5.2 Thermometer, laboratory grade, partial immersion ther-
priate safety, health, and environmental practices and deter-
mometer. Range: from 0 to 230°F, 2° divisions; or from−20 to
mine the applicability of regulatory limitations prior to use.
110°C, 1° divisions.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5.3 Reflux Condenser.
ization established in the Decision on Principles for the
5.4 Stirrer—A motor-driven, variable-speed agitator. The
Development of International Standards, Guides and Recom-
shaft and blade shall be of nonreactive material.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 5.5 Heat Source—Electric heating mantle or gas burner.
5.6 Ammonium Hydroxide, reagent grade, 28 to 30% NH
2. Referenced Documents
(26° Baumé). This solution shall be refrigerated while in
2.1 ASTM Standards:
storage.
D1544TestMethodforColorofTransparentLiquids(Gard-
5.7 Distilled Water, or water of equal purity.
ner Color Scale)
D2834Test Method for Nonvolatile Matter (Total Solids) in
6. Preparation of Sample
Water-Emulsion Floor Polishes, Solvent-Based Floor
6.1 Resinreceivedingroundorflakedformshallbeusedas
Polishes, and Polymer-Emulsion Floor Polishes
received. Select a sample representative of the material under
E70Test Method for pH of Aqueous Solutions With the
test.
Glass Electrode
6.2 Resin received in lump form shall be crushed or ground
3. Summary of Practice
and passed through a 10-mesh screen before testing. Select a
sample representative of the material under test.
3.1 Alkali-soluble resins are dissolved in water by chemi-
cally reacting available carboxylic acid sites on the resin
7. Procedure
molecule with a base to form water-soluble carboxylate salts.
In this practice, the base used is ammonium hydroxide. 7.1 Insert the reflux condenser into one of the sidearms of
the flask and support the assembly suitably. Insert the agitator
throughthecenterneckandchargetheflaskwiththecalculated
This practice is under the jurisdiction of ASTM Committee D21 on Polishes
amount of ammonium hydroxide and water. Using moderate
and is the direct responsibility of Subcommittee D21.02 on Raw Materials.
agitation, slowly add the resin to the contents of the flask.
Currente
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