1、 FORD LABORATORY TEST METHOD BO 024-01 Date Action Revisions 2001 03 27 Revised Editorial no technical change A. Cockman 1992 07 27 Printed copies are uncontrolled Page 1 of 6 Copyright 2001, Ford Global Technologies, Inc. DETERMINATION OF MOISTURE CONTENT OF NYLON MOISTURE METER METHOD Application
2、This procedure describes a method for determining the moisture content of nylon resins having moisture contents in the range of 0.04 to 2.5 %. This method is applicable to nylon molding powders in the form of 1/8 inch cubes and to fabricated nylon articles from which chips approximately this same si
3、ze may be cut. This procedure, which depends on the volatilization of moisture, should be used only where it has been determined that the presence of plasticizers, fillers, lubricants or other materials added to the base nylon will not interfere with the determination. Unless test data indicates tha
4、t these added materials do not interfere with the procedure, it is recommended that moisture determinations with this method be restricted to Type 6 nylons only. Equipment Required Moisture Meter - Complete Unit (See Figure 1) Source: Manufacturers Engineering & Equipment Co. Hatboro, PA or (a) A fo
5、ur-well heater block with a control for maintaining temperature of 200 +/- 2 C and 240 +/- 2 C. (b) Four 50 cc “Luer-Lok“* type hypodermic syringes, calibrated in millimeters, selected for sliding fits at operating temperatures with outside diameters corresponding to the well openings in the heater
6、block. *Trademark of Becton, Dickinson & Co. (c) “Luer-Lok“ type closure for each syringe. (d) “Luer-Lok“ type connector with a 6 inch length of tubing. FORD LABORATORY TEST METHOD BO 024-01 Page 2 of 6 Copyright 2001, Ford Global Technologies, Inc. (e) Quantity of Dow Corning 200 silicone oil, 20 c
7、entipoise or equivalent. Prior to the moisture determination and with each new shipment of silicone oil, it will be necessary to run a blank since the silicone oil may contain volatiles. (f) Thermometer covering the 200 - 240 C range. (g) Carrying case. (h) Analytical balance. (i) Metal tongs. (j) C
8、otton gloves. (k) Rack for storing hot syringes. (l) Brush for cleaning the cylinders. (m) Lintless cloth. 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 2
9、4 h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. Turn heater block on and temperature to reach equilibrium at 240 +/- 2 C. 2. Carefully clean the syringe cylinder and piston with a lintless cloth to remove all lint or dirt particles. 3. If sample is
10、from a molded part, cut pieces approximately the size and shape of 1/8 inch cubes. 4. Weigh out sample on balance (a) 10 +/- 0.2 g where moisture content is suspected of being in the .05 - .4 % range. (b) 1 +/- .05 g where moisture content is suspected of being in the 0.4 -2.5 % range. Note: Weigh o
11、ut sample as rapidly as possible since nylon absorbs moisture from humid air. FORD LABORATORY TEST METHOD BO 024-01 Page 3 of 6 Copyright 2001, Ford Global Technologies, Inc. 5. Place the weighed sample in the syringe, using care not to allow small particles to remain on the wall. 6. Before insertin
12、g the piston, wet it and the syringe inside wall with a generous amount of silicone oil. A small tube or other similar device should be used to allow the oil to flow down the wall so that any particles remaining on the wall will be washed down. The same approximate amount of silicone oil should be u
13、sed for each determination. 7. Insert the piston as far as possible into the syringe, rotating the piston to insure complete lubrication of all contacting surfaces. 8. Attach the tubing to the discharge end of the syringe, using the standard fitting. Place free end of tubing in the oil reservoir and
14、 slowly withdraw the piston to suck sufficient oil into the syringe to cover the sample with a 5 or 10 mm layer of oil. 9. Invert the syringe (discharge end up) and remove the tubing and the standard fitting. Rotate and work the piston up and down a small amount to dislodge all bubbles trapped betwe
15、en cubes and along the syringe wall. 10. Push piston in slowly to finally expel the air from between the oil level and the end of the syringe. Reinvert the syringe (discharge end down). Continue to insert the piston slowly, wiping off excess oil, until the piston nearly touches the sample. Cap the s
16、yringe with the standard closure while continuing to lightly expel oil so that no air bubble may enter. 11. Check carefully for bubbles. If bubbles are found, repeat Steps 8 - 10. 12. Record the reading on the piston at the lip of the syringe for the initial point. 13. Record time and temperature. 1
17、4. Place the syringe in the appropriate well in the heater block. 15. After 45 minutes, record the reading on the piston at the lip of the syringe for the final point. The analysis is now completed. 16. Using gloves and tongs, remove the syringe to a rack or beaker and allow to cool. Remove closure
18、and piston from syringe, pour off oil into beaker and discard the sample. The silicone fluid must not be reused unless it has been demoisturized*. Using appropriate curve, determine percent of moisture present. *Demoisturizing Process: Heat fluid to 240 C in an open container. A large test tube, ins
19、erted into the aluminum heater block may be used. 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. FORD LABORATORY TEST METHOD BO 024-01 Page 4 of 6 Copyright
20、 2001, Ford Global Technologies, Inc. DETERMINATION OF MOISTURE CONTENT OF NYLON MOISTURE METER METHOD Moisture Meter Commercial Unit Figure1 FORD LABORATORY TEST METHOD BO 024-01 Page 5 of 6 Copyright 2001, Ford Global Technologies, Inc. DETERMINATION OF MOISTURE CONTENT OF NYLON MOISTURE METER METHOD Calibration Curve for ESF-M4D150-A, M4D82-A, M4D89-A Moisture Content - % Figure 2 FORD LABORATORY TEST METHOD BO 024-01 Page 6 of 6 Copyright 2001, Ford Global Technologies, Inc. DETERMINATION OF MOISTURE CONTENT OF NYLON MOISTURE METER METHOD Moisture Content - % Figure 3
