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ASTM D5629-05

(Test Method)

Standard Test Method for Polyurethane Raw Materials Determination of Acidity in Low-Acidity Aromatic Isocyanates and Polyurethane Prepolymers

Standard Test Method for Polyurethane Raw Materials Determination of Acidity in Low-Acidity Aromatic Isocyanates and Polyurethane Prepolymers

SIGNIFICANCE AND USE
This test method can be used for research or for quality control to characterize aromatic isocyanates and low-acidity prepolymers. Acidity correlates with performance in some polyurethane systems.
SCOPE
1.1 This test method measures the acidity, expressed as ppm of hydrochloric acid (HCl), in aromatic isocyanate or polyurethane prepolymer samples of below 100 ppm acidity. The test method is applicable to products derived from toluene diisocyanate and methylene-bis-(4-phenylisocyanate) (see Note 0). Refer to Test Method D 6099 for determination of acidity in moderate- to high-acidity aromatic isocyanates.ISO 14898, Method B is technically equivalent to this test method.
1.2 The values stated in SI units are to be regarded as the standard.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
28-Feb-2005
ICS
83.080.10 - Thermosetting materials
Technical Committee
D20 - Plastics
Drafting Committee
D20.22 - Cellular Materials - Plastics and Elastomers
Current Stage
Ref Project

Relations

Replaces
ASTM D5629-99 - Standard Test Method for Polyurethane Raw Materials Determination of Acidity in Low-Acidity Aromatic Isocyanates and Polyurethane Prepolymers
Effective Date
01-Mar-2005
Replaced By
ASTM D5629-11 - Standard Test Method for Polyurethane Raw Materials Determination of Acidity in Low-Acidity Aromatic Isocyanates and Polyurethane Prepolymers
Effective Date
01-Feb-2011
Referred By
ASTM D1786-21 - Standard Specification for Toluene Diisocyanate
Effective Date
01-Mar-2005

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ASTM D5629-05 - Standard Test Method for Polyurethane Raw Materials Determination of Acidity in Low-Acidity Aromatic Isocyanates and Polyurethane PrepolymersASTM D5629-05 - Standard Test Method for Polyurethane Raw Materials Determination of Acidity in Low-Acidity Aromatic Isocyanates and Polyurethane Prepolymers
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ASTM D5629-05 - Standard Test Method for Polyurethane Raw Materials Determination of Acidity in Low-Acidity Aromatic Isocyanates and Polyurethane Prepolymers
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D5629–05
Standard Test Method for
Polyurethane Raw Materials: Determination of Acidity in
Low-Acidity Aromatic Isocyanates and Polyurethane
1
Prepolymers
This standard is issued under the fixed designation D5629; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* ISO 14898 Plastics—Aromatic Isocyanates for Use in the
Production of Polyurethane—Determination of Acidity
1.1 This test method measures the acidity, expressed as ppm
of hydrochloric acid (HCl), in aromatic isocyanate or polyure-
3. Terminology
thane prepolymer samples of below 100 ppm acidity. The test
3.1 Definitions—The terminology in this test method fol-
method is applicable to products derived from toluene diiso-
lows the standard terminology defined in Terminology D883.
cyanate and methylene-bis-(4-phenylisocyanate) (see Note 1).
3.2 Definitions of Terms Specific to This Standard:
Refer to Test Method D6099 for determination of acidity in
3.2.1 acidity, n—the acid strength of a sample expressed in
moderate- to high-acidity aromatic isocyanates.
ppm HCl.
NOTE 1—ISO 14898, Method B is technically equivalent to this test
method.
4. Summary of Test Method
1.2 The values stated in SI units are to be regarded as the 4.1 The isocyanate is mixed with an excess of n-propanol, a
standard.
cosolvent and a known amount of HCl. Additional acid is
1.3 This standard does not purport to address all of the released into the solvent system during urethane formation.
safety concerns, if any, associated with its use. It is the
The acid is then titrated potentiometrically with methanolic
responsibility of the user of this standard to establish appro- KOH. The same procedure is performed with a blank solution
priate safety and health practices and determine the applica-
andthedifferenceintiterisusedtocalculatetheaciditypresent
bility of regulatory limitations prior to use. in the isocyanate sample.
2. Referenced Documents 5. Significance and Use
2
2.1 ASTM Standards:
5.1 This test method can be used for research or for quality
D883 Terminology Relating to Plastics control to characterize aromatic isocyanates and low-acidity
D6099 Test Method for Polyurethane Raw Materials: De-
prepolymers. Acidity correlates with performance in some
termination of Acidity in Moderate to High Acidity Aro- polyurethane systems.
matic Isocyanates
6. Apparatus
E180 Practice for Determining the Precision of ASTM
Methods for Analysis and Testing of Industrial and Spe- 6.1 Disposable Beakers, 250 mL.
cialty Chemicals 6.2 Repipet,50mL.
3
2.2 ISO Standards: 6.3 Pipet, 100 mL, class A volumetric; or a 100-mL buret
with a dosimat; or a 100-mL repipet, class A volumetric.
6.4 Automatic Titration Equipment, such as the following:
1
4
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
6.4.1 Titroprocessor.
and is the direct responsibility of Subcommittee D20.22 on Cellular Plastics.
Current edition approved March 1, 2005. Published March 2005. Originally
4
approved in 1994. Last previous edition approved in 1999 as D5629 - 99. DOI: The sole source of supply of instruments similar to and including the Metrohn
10.1520/D5629-05. 686 Titroprocessor with a Metrohn 665 Dosimat/magnetic stirrer known to the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or committee at this time is Brinkman Instruments Company, Division of Sybron
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Corporation, Cantiague Road, Westbury, NY 11590-9974, have been found to be
Standards volume information, refer to the standard’s Document Summary page on satisfactoryforthisanalysis.Ifyouareawareofalternativesuppliers,pleaseprovide
the ASTM website. this information to ASTM International Headquarters. Your comments will receive
3 1
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., careful consideration at a meeting of the responsible technical committee , which
4th Floor, New York, NY 10036. you may attend.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D5629–05
4
6.4.2 Dosimat, with magnetic stirrer. 11.4 Pipet 100 mL of acidified n-propanol into the solution
6.4.3 Reference Electrode (Brinkman Catalogue No. 020- so that the volume can be reproduced to 0.05 mL.
94-400-5 or equivalent: bridge electrolyte (double junction), 11.5 Add a stir bar, cover with a watch glass and stir for 20
sleeve-typediaphragm),having
...

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5.2 Dynamic mechanical testing provides a sensitive method for determining cure characteristics by measuring the elastic and loss moduli as a function of temperature or time, or both. Plots of cure behavior and tan delta of a material versus time provide graphical representation indicative of cure behavior under a specified time-temperature profile.  
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SCOPE
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