ASTM D1981-2002(2006) Standard Test Method for Measuring Color After Heating of Tall Oil Fatty Acids《脂肪酸加热色变测定的标准试验方法》.pdf
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1、Designation: D 1981 02 (Reapproved 2006)Standard Test Method forMeasuring Color After Heating of Tall Oil Fatty Acids1This standard is issued under the fixed designation D 1981; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the measurement of the Gardnercolor of tall oil fatty acids after heating in an atmosp
3、here ofnitrogen at 205C for one or two h, depending on whether itsiodine value is over or under 15, respectively. The specimenmay be heated using either an aluminum heating block or an oilbath. This method is applicable to all tall oil fatty acids.Applicability of this method to other types of fatty
4、 acids hasnot been determined.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of
5、this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 1544 Test Method for Color of Transparent Liquids(Gardner Color Scale)D 6166 Test Method for Color of Naval Stores
6、and RelatedProducts (Instrumental Determination of Gardner Color)E1 Specification for ASTM Liquid-in-Glass Thermometers3. Significance and Use3.1 The color of a tall oil fatty acid is readily affected byheat and oxidization. Variations in degree of heat, time of heat,and exposure to atmosphere durin
7、g heating have a markedeffect on the color obtained; therefore, conformity to theequipment and procedure outlined in this test method isessential to accuracy and precision.4. Heating ApparatusMethod A, Aluminum Block4.1 Forced Draft Oven, maintained at 205 6 2C.4.2 Aluminum Heating Block (see Fig. 1
8、). Wrap the outersurface with an appropriate insulating material.5. Heating ApparatusMethod B, Oil Bath5.1 Oil BathA 5-L steel beaker equipped with a mechani-cal stirrer and containing any light-colored alkali-refined oilsuch as hydrogenated cottonseed oil.5.2 Heat SourceAn electric immersion heater
9、 with suit-able thermostatic control may be used. The heater shall be ofsufficient capacity so that when placing several tubes in thebath, the bath temperature does not drop by more than 5Cbelow the minimum bath temperature and the recovery time toreach 205C does not exceed 5 min.5.3 Test Tube Holde
10、r (see Fig. 2).6. Materials6.1 Thermometer, range 95 to 255C, 0.5 subdivisions, 100mm partial immersion, conforming to the requirements forThermometer 42C as prescribed in Specification E1.6.2 Tubes, 25 mm (1 in.) in diameter, 240 mm (912 in.) inlength with ground-glass joints (see Fig. 3) and adapt
11、er.6.3 Timer, capable of registering up to 135 min.6.4 Nitrogen, a source of nitrogen capable of being regu-lated to a pressure of 7 to 14 kPa (1 to 2 psi).6.5 Bubble Counter for NitrogenAs a liquid, use a portionof tall oil fatty acid, instead of water or mercury.6.6 Gardner Color Tubes or 1 cm Cuv
12、etSee Test MethodsD 1544 or D 6166.7. ProcedureMethod A, Aluminum Block7.1 Insert the thermometer into the aluminum block. Placethe block in a forced-draft oven maintained at a temperature of205 6 2C.7.2 Fill a clean, dry tube to a depth of approximately 125mm with the specimen.7.3 Place a fitted ad
13、apter in each tube. Adjust the flow ofnitrogen through the side arm of the adapter at a rapid rate for3 to 5 min to displace the air, then reduce the flow to a gentlerate of 2 or 3 bubbles per second so that the surface of thespecimen is blanketed by nitrogen at all times. Place the tubein one of th
14、e wells of the heating block. The temperature of the1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.34 on Naval Stores.Current edition approved Nov. 1, 2006. Published Nove
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