PDF《Ti-Pure?》

Ti-Pure? TITANIUM DIOXIDE GLOSS, 30J AUTOMOTIVE ENAMEL METHOD: T4400.

010.02.WP

1 TITANIUM_DIOXIDE (TI-PURE?) Determination of Alkyd Automotive Gloss (20 degrees) (T4400.010.02WP) I. Principle Paints are prepared from dry, finished pigment samples and low and high gloss pigment standards. The pigments are dispersed in an alkyd vehicle, sand-milled and reduced with resins and thinners to spray consistency. Aluminum panels are spray painted using automatic spraying equipment under controlled conditions to produce uniform film thickness and surface characteristics. The paint films are then baked. Finally gloss is determined by measuring 20° specular reflectance of the panels and calculating gloss in relationship to the reflectance values of the high and low gloss standards. II. Applicability A. General This method can be used to determine pigment gloss in an alkyd vehicle. The paint system is solvent borne, melamine-formaldehyde fortified alkyd at

59 wt.% solids, pigmented with

19 vol.% TiO2 pigment in the paint film (PVC). NOTE: The above formulation is not more precise because of the usual density and solids content ambiguities in the composition of resins and pigments. III. Limitations This method can only be used with enamel grade pigment. IV. Sensitivity, Precision and Accuracy A. Sensitivity Data are unavailable.

2 B. Precision 1. Single Operator _ The average analysis (X), standard deviation (s) and 95% confidence limits (95% CL) established for the single operator precision of the method were as follows: _ X s 95% CL Alkyd Gloss 59.4 1.19 ± 2.49 The above data were calculated from

20 replicate analyses of

1 sample performed by

1 technician over a period of a few days. 2. Multiple Operator _ The average analysis (X), standard deviation (s) and 95% confidence limits (95% CL) established for the multiple operator precision of the method were as follows: _ X s 95% CL Alkyd Gloss 70.9 1.01 ± 1.98 The above data were calculated from

32 replicate analyses of

1 sample performed by

8 technicians over a period of several days. C. Accuracy Not applicable. No absolute standards. V. Special Apparatus (Equivalent apparatus may be substituted) Hockmeyer Mixer Model

2 HL, available from Hockmeyer Equipment Corp., PO Box 113, Harrison, NJ 07029, (201) 482-0225. HunterLab Models D-48-7, D-48-8, D-48-D or PRO-3, for reading gloss at 20°, Hunter Associates Laboratory Inc.,

11491 Sunset Hills Road, Reston, VA.

22090 703-471-6870, or BYK Multi Gloss Meter, 20° 60° 85°, from BYK-Gardner,

2435 Linden Lane, Silver Springs, MD 20910, 301-589-4747

3 VI. Reagents 1. Acetone, Exxon Houston TX., purchase locally, or Lacquer Thinner, DuPont 3602S. 2. Beckosol 12-035 (R), Alkyd type resin, 60% solids content, Reichold Chemicals Inc.,

407 South Pace Blvd., Pensacola, FL 32596. 3. Cymel 248-8 (R), Amine type resin, 55% solids content., American Cyanamide Co., Polymer Products Div., PO box 425, Wallingford, CT 06492. 4. Hi-Sol

10 (R) (high flash naptha), Ashland Chemical Inc., PO Box 13305, Memphis, TN

38101 5. n-Butanol, Ashland Chemical Inc.,

91 Van Buren St., Nashville, TN 37208. 615-320-5474 (Ashland Chemical Inc., PO Box 371002M, Pittsburgh, PA 152507002) 6. Xylol (xylene), Exxon Houston TX., purchase locally. 7. Ottawa Silica Sand (R), 20-30 mesh, Ottowa Sand Corp., Ottowa. IL, 61350. 800-635-7263. VII. Special Safety Considerations A. Product Hazards Refer to the Material Safety Data Sheets (MSDS) on any chemicals with which you are unfamiliar. No product hazards have been identified with titanium dioxide. However, titanium dioxide is regulated as an air contaminant and care should be exercised to minimize product dusting. Wipe up all spills with a damp paper towel. For more information, refer to MSDS #2816CR.