The Properties and the Analysis for Surface, Interface and Reformed Surface of Color Materials (II):Application of Photoacoustic Spectrometry to Studies of Thermal Stability of ZrO<SUB>2</SUB>-SiO<SUB>2</SUB> Coated, SiO<SUB>2</SUB> Coated and Uncoated Ch
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概要
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The thermal stabilities of uncoated, ZrO<SUB>2</SUB>-SiO<SUB>2</SUB> coated and SiO<SUB>2</SUB> coated chrome yellow pigments in polyethylene (PE) at thermal extrusion molding were studied by the method of photoacoustic spectroscopy. <BR>The reduced thermal decomposition of chrome yellow in PE was led to the formation of Cr<SUB>2</SUB>O<SUB>3</SUB>, and this product contributed to the color changing of PE panel contained chrome yellow.<BR>The amount of Cr<SUB>2</SUB>O<SUB>3</SUB> was proportional to temperature of thermal extrusion molding of 0.5% uncoated chrome yellow in PE and these rate constant from 240°C to 280°C was 0.355%/°C and from 280°C to 320°C was 0. 183%/°C.<BR>At the thermal extrusion molding of 0.5% ZrO<SUB>2</SUB>-SiO<SUB>2</SUB> coated chrome yellow in PE, the amount of Cr<SUB>2</SUB>O<SUB>3</SUB> was proportional to the temperature of thermal extrusion molding, and these rate constant from 240°C to 280°C was 0.108%/°C and from 280°C to 320°C was 0.088%/°C.<BR>The controlled effect of color changing of sample panel by coated material on chrome yellow was indicated in order of ZrO<SUB>2</SUB>-SiO<SUB>2</SUB>SiO<SUB>2</SUB>.
- Japan Society of Colour Materialの論文