ASTM D3837-95

ASTM D3837 95 - 0759530 05b94bb 3T=l -
AMERICAN SOCIETY FOR TESTtNG AND MATERIALS
Designation: D 3837 - 95
100 Barr Harbw Dr., West Gmshohodten. PA 19428
Reprinted frcm the Annual SC& of ASTM Standards. Cqyi$t ASTM
If not listed in the cumnt cm-bid index. wil appear in tfw next edition.
Standard Practice for
Preparing a Solution of Alkali-Soluble Resins1
This standard is issued under the fixed designation D 3837; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (c) indicates an editorial change since the last revision or reapproval.
1. Scope 5.6 Ammonium Hydroxide, reagent grade, 28 to 30 %
NH, (26’ BaumC). This solution shall be refrigerated while in
1.1 This practice is a procedure for preparing solutions of
storage.
alkali-soluble resins in aqueous ammonia and determining
5.7 Distilled Water or water of equal purity.
the characteristics of such solutions.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Preparation of Sample
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
6.1 Resin received in ground or flaked form shall be used
bility of regulatory limitations prior to use.
as received. Select a sample representative of the material
under test.
2. Referenced Documents
6.2 Resin received in lump form shall be crushed or
2.1 ASTM Standards: ground and passed through a IO-mesh screen before testing,
D 1544 Test Method for Color of Transparent Liquids Select a sample representative of ‘the material under test.
(Gardner Color Scale)z
D 2834 Test Method for Nonvolatile Matter (Total Solids)
in Water-Emulsion Floor Polishes, Solvent-Based Floor 7. Procedure
Polishes, and Polymer-Emulsion Floor Polishes3
7.1 Insert the reflux condenser into one of the sidearms of
E 70 Test Method for pH of Aqueous Solutions with the
the flask and support the assembly suitably. Insert the
Glass Electrode4
agitator through the center neck and charge the flask with the
calculated amount of ammonium hydroxide and water.
3. Summary of Practice
Using moderate agitation, slowly add the resin to the
3.1 Alkali-soluble resins are dissolved in water by chemi-
contents of the flask. Adjust the agitator speed as necessary
cally reacting available carboxylic acid sites on the resin
to keep the resin suspended and moving, but not so fast as to
molecule with a base to form water-soluble carboxylate salts.
entrain air into the solution. Heat the solution to the
In this practice, the base used is ammonium hydroxide.
specified temperature within 10 min, and maintain this
temperature until the solution is complete, or for a max-
4. Significance and Use
imum of 30 min. If the solution is cloudy or hazy at this
4.1 This practice is suitable for all types of akalali-soluble
point, add additional ammonium hydroxide to clear solu-
resins. The resin manufacturer shall specify the percent
tion. Total heating time shall not exceed 40 min. Cool the
ammonium hydroxide to be used (based on the equivalent
solution and transfer to a clear, clean glass bottle.
weight of resin) and the maximum temperature to be used to
achieve solu
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