1、 FORD LABORATORY TEST METHOD AO 005-02 Date Action Revisions 2001 01 30 Revised Editorial no technical change A. Cockman 1992 04 30 Printed copies are uncontrolled Page 1 of 3 Copyright 2001, Ford Global Technologies, Inc. AMINE EQUIVALENT OF PREPOLYMER OF FLEXIBLE POLYURETHANE FOAM Application This
2、 is a test for determining the amine equivalent (NCO) of prepolymer of flexible polyurethane foam. Apparatus Required Automatic Burette with Desiccant Tubes 100 mL. Catalog #BG 7540 or equivalent. Source: Gardner Laboratory Bethesda, Maryland Pipettes (1) 20 mL (1) 25 mL Analytical Balance Accurate
3、to 1.0 mg. Erlenmeyer Flask 500 mL, glass stoppered Steam Bath Glass Stirring Rod Graduates - Cylindrical (1) 1000 cc (1) 500 CC Hypodermic Syringe 10 mL Hood - Fume FORD LABORATORY TEST METHOD AO 005-02 Page 2 of 3 Copyright 2001, Ford Global Technologies, Inc. Chemicals Required Dibutyl Amine (Rea
4、gent Grade, Redistilled 2N) Toluene, Dry (Reagent Grade) Brom Cresol Green - Water Soluble Hydrochloric Acid .5 N - standardized by accepted method to +/- .001 N. Distilled Water Isopropyl Alcohol - Anhydrous (Reagent Grade) Preparation of Reagents Dibutyl-Amine (2 Normal) Caution: Handle in fume ho
5、od. Add by graduate 340 cc of dibutyl amine to the 1000 cc graduate. Dilute to 1000 cc with the dry toluene. Mix well and store in a brown bottle, away from any light. Note: This quantity is sufficient for 30 - 40 tests. Indicator .1 gram brom cresol green, indicator grade. Dissolve in distilled wat
6、er and dilute to 100 mL with distilled water. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unl
7、ess otherwise specified. Procedure Weigh the sample to be tested according to chart. Anticipated Amine Equivalent Sample SizeTolerance 0 100 1 - 2 grams +/- 5 mg 100 250 2 - 3 grams +/- 5 mg 250 500 3 - 5 grams +/- 5 mg 500 5 - 7 grams +/- 50 mg FORD LABORATORY TEST METHOD AO 005-02 Page 3 of 3 Copy
8、right 2001, Ford Global Technologies, Inc. 1. Clean the 500 cc Erlenmeyer flask. 2. Add required amount of sample (see chart) to flask. Use glass hypodermic syringe. 3. Add 25 mL of toluene into flask, using pipette. Dissolve sample. Warm gently if necessary. DO NOT BOIL. 4. Add 20 mL of the 2 norma
9、l dibutyl-amine solution into flask and stopper. Swirl vigorously and allow to cool for 10 - 20 minutes to 23 +/- 2 C. CAUTION: Moisture must be kept out of solution. 5. Add 100 mL of isopropyl alcohol. 6. Add 10 drops of brom cresol green indicator. 7. Titrate carefully with .5 N HCL to a yellow en
10、d point, taking at least 15 seconds. 8. Run a blank determination in the same manner simultaneously, using all the reagents but omitting the sample. Calculation: Amine Equivalent = W (B - S) x N W = Sample weight in milligrams B = Volume of HCl used in blank S = Volume of HCl used in sample N = Exact normality of HCl Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities.
