Some copper (n) phosphates were synthesized by the reaction between CuSO4 solution and K2HPO4 solution at 96°C, and their synthetic processes and particle properties were investigated. The initial product of the reaction was powdery Cu4H (PO4) 3.3 H2O which had adsurbed K3PO4. The copper (II) phosphate was then converted to other phosphates depending on the initial concentration ratio R (= [K2HPO4] / [CuSO4]). When R was 0.5~6.0, Cu2 (PO4) OH of pale grayish yellow green (Y : 57.p%, λd : 557.7 nm) was obtained ; when R=7.0, Cu5 (PO4) 2 (OH) 4 of pale green (Y : λd : 490.3 nm) was obtained ; and when R was 8.0 or above, KCuPO4.H2O (ca. 20×20μm, platy crystal) of light blue (Y : 48.9%, λd : 480.4 nm) was obtained. The thermal changes of those copper (II) phosphates were summarized as follows ; Cu2 (PO2) OH600°C→Dehydration Cu4 (PO4) 2O (vivid yellow green, Pe : 34.5%, λd : 554.9 nm) Cu5 (PO4) 2 (OH) 4 490°C→Dehydration Amorphous phase 640°C→CrystallizationCu5 (PO4) 2O2 (brilliant yellow green, Pe : 50.1%, λd : 557.5 nm) KCuPO4. H2O 91°C→Dehydration l-KCuPO4 (Low-temperature) 585°C→Transition h-KCuPO4 (High-temperature) Some copper (II) phosphates prepared in this study were found to be applicable as inorganic pigments.
A few kinds of CoHPO4¥3/2 H2O with different crystal shapes and particle size were synthesized by the reaction between 2 CoCO3.3 Co (OH) 2 and H3PO4 in water at 96°C and the interrelation between their color and particle size was investigated. The color of the products varied depending on synthetic conditions, such as the ratio of starting material R= [P2O5]/ [CoO] and aging time. CoHPO4.3/2 H2O of yellowish red (λd ; 578~590 nm) was produced at R=1.0~1.25. The color of the products was tinged red with the aging time. Their dominant wavelengths shifted higher with increasing particle size. Linear relationships were found between the dominant wavelength and the logarithms of the particle's width and thickness. CoHPO4.3/2 H2O of reddish purple (λc ; 510 nm) was synthesized by the addition of an organic compounds (1-butanol, ethylene glycol or 1, 4-dioxane) to the system. The color of the product was mostly influenced by the thickness of the particle, and turned from yellowish red to reddish purple with increasing particle size.
Five sorts of fluorosilicones having different fluoroalkyl group (RF) and substitution number were synthesized by the reaction of 3, 3-diphenyl hexamethyl trisiloxane (DPS) with bis (fluoroalkanoyl) peroxides. The novel fluorosilicones showed a good antifoaming effect in aqueous systems. The effect was almost independent of the substitution number, but it was improved with the increase in the length of RF chain. It was found that the improved antifoaming effect of the fluorosilicones is closely related to the changes of interfacial properties caused by the introduction of RF group to DPS : They are a decrease in the surface tension ; an increase in the spreadability on water surface (an increase in formation ability of a monolayer); and an increase of the area per molecule on an air/water interface.