Preparation and Characterization of Barite/TiO2Composite Particles

To make full use of barite mineral and obtain a kind of composite particles material which has the property of both barite and TiO2, the composite particles material with TiO2coated on the surface of barite particle was prepared by the method of TiOSO4solution chemical hydrolysis and precipitation to form hydrolysis composite, removing the impurities of hydrolysis composite, drying, and calcination in this study. The results were evaluated by the covering power of composites. Composite structure and properties were characterized by means of XRD, SEM, FTIR, and XPS. The results showed that the surface of barite had been coated with rutile TiO2uniformly and compactly and the hiding power value and oil absorption value of the composite powder were 18.50 g/m2and 15.5 g/100 g, respectively, which had similar pigment performances to TiO2. The results also showed that it was mainly the strong chemical bond between barite and TiO2that combined them firmly in barite/TiO2composite particle (B/TCP).

Study on the Covering Property of White Water-Based Flexo Ink

Covering property (CP) is the most important performance of white ink. In order to research the CP of white water-based flexo ink, this paper studies the component part of ink, which is prepared by changing (a) the variety of both pigments and resins, (b) the ratio of pigment to resin, (c) the variety and the content of dispersants and (d) the variety of film-forming resins. This paper tests the diameter size and coating it onto the surface of the covering power test paper to get their CP data. It has been testified that the dispersion property is the major factor that influences the CP of the white water-based covering ink. The variety of both pigments and resins, the ratio of pigment to resin are the key factors for the CP; the result also proves that different kind of dispersants and contents are also important factors that influence the dispersion property.

Experiment Research on Preparation Pigment Type Magnetic Iron Oxide Powder Utilizing Magnetic Separated Slag

This per systematically studies the influence of roasting temperature and time to the composition and performance of magnetic iron powder, with magnetic separated converter slag as raw material, and low-temperature roasting-magnetic separation craft is also used with analyzing methods of chemical, XRD, tinting strength and so on. The investigation reveals that: pigment type iron powder with high tinting strength and covering power can be prepared with magnetic separated converter slag. Iron content and tinting strength of the iron powder rise with reaction temperature, while the covering power tends to decrease. Tinting strength of the iron powder tends to rise with extending of reaction time, while covering power rises in the first and reduces afterward, with highest covering power of 56g•m-2 at reaction time of 30min.

The Research about EDTA Plating Solutions of Non-Cyanide Copper Plating

Six formulae of plating solution were studyed in the experiment. The first formula was cyanide plating solutions. The others formulae based on the EDTA as primary complexing agent, C6H5O7K3•H2O and KNaC4H4O6•4H2O as auxiliary complexing agent. Bath quality of the six formulae were examined and Compared. The results show that the EDTA system improve the ability of throwing power, covering power, current efficiency and reduce the bath voltage. In some ways, the performance of EDTA system were better than cyanide plating solutions, such as the deep plating ability, dispersing power, cathodic current efficiency.

The Semantic View, Empirical Adequacy, and Application

It is widely accepted in contemporary philosophy of science that the domain of application of a theory is typically larger than its explanatory covering power: theories can be applied to phenomena that they do not explain. I argue for an analogous thesis regarding the notion of empirical adequacy. A theory’s domain of application is typically larger than its domain of empirical adequacy: theories are often applied to phenomena from which they receive no empirical confirmation.