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Article
Publication date: 1 September 1976

A. Marchese, A. Papo and G. Torriano

Summary Chlorinated rubber primers formulated with active pigments, which are claimed to be non‐toxic and non‐polluting, are investigated; they are designed for the protection of…

17

Abstract

Summary Chlorinated rubber primers formulated with active pigments, which are claimed to be non‐toxic and non‐polluting, are investigated; they are designed for the protection of ships (above the waterline), port installation, industrial plants, bridges, etc.

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Anti-Corrosion Methods and Materials, vol. 23 no. 9
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 August 1982

Anne J. Walton

Salts of aluminium and calcium such as stearates, octoates and naphthenates, are used to impart structure to oleoresinous paints. Alternatively, aluminium alcohoiates can be used…

98

Abstract

Salts of aluminium and calcium such as stearates, octoates and naphthenates, are used to impart structure to oleoresinous paints. Alternatively, aluminium alcohoiates can be used as reactive intermediates which form salts by reaction with the medium. The use of these materials is generally restricted to flat or semi‐gloss paints and storage instability is sometimes encountered. A chlorinated rubber paint which contains titanium, kaolin, talc, a chloroparaffin plasticiser, and a solvent blend of hexyl acetate and xylene, is rendered thixotropic using a 1% level of aluminium stearate addition. The product is suitable for applying as thick corrosion‐resistant coatings to metals.

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Pigment & Resin Technology, vol. 11 no. 8
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 9 May 2016

Lydia Kuranchie-Pong, Godfred Alufa Bokpin and Charles Andoh

This paper aims to empirically examine the relationship between disclosure and risk-taking of banks in Ghana. The study also aims to gain an insight into the general risk-taking…

886

Abstract

Purpose

This paper aims to empirically examine the relationship between disclosure and risk-taking of banks in Ghana. The study also aims to gain an insight into the general risk-taking behaviour of banks in Ghana for the period 2007-2011.

Design/methodology/approach

The study used panel regression model and relate risk-taking to disclosure, controlling for bank size, profitability, liquidity and treasury bill rate. Disclosure scores from a disclosure index are used as a measure of disclosure, likewise Z-score as a measure of total risk. Also, the ratio of provisions for loan losses to gross loans by each bank for each year was used to examine the general risk-taking behaviour of Ghanaian banks.

Findings

The study revealed that the election year and the immediate subsequent year are characterized by an increase in non-performing loans. Greater disclosure is associated with more risk-taking and vice versa. This implies that market discipline is not effective in Ghana. Treasury bill rate, profitability and liquidity were found to be economically meaningful and statistically significant in influencing risk-taking of banks in Ghana.

Originality/value

As there are relatively few studies conducted in this area, specifically among banks in Ghana, this study will broaden the scope of the literature on disclosure and risk-taking by providing empirical evidence.

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Journal of Financial Regulation and Compliance, vol. 24 no. 2
Type: Research Article
ISSN: 1358-1988

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Article
Publication date: 1 December 1985

J Boxall

The rheological properties of a coating are important determinants of storage, application and flow characteristics and, as such, the need for its accurate measurement is an

32

Abstract

The rheological properties of a coating are important determinants of storage, application and flow characteristics and, as such, the need for its accurate measurement is an important requirement in formulation development. Measurement of rheology is also an important phase of quality control testing, though frequently less sophisticated, more rapid, characterisation techniques may sometimes be used here. This article will consider some of the literature concerned with techniques of measuring coating rheology.

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Pigment & Resin Technology, vol. 14 no. 12
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 1 February 2001

M. Deyá, V.F. Vetere, R. Romagnoli and B. del Amo

The efficiency of two anticorrosive pigments containing aluminium polyphosphate was studied. Pigments were analysed by current analytical techniques and characterised by FT‐IR…

626

Abstract

The efficiency of two anticorrosive pigments containing aluminium polyphosphate was studied. Pigments were analysed by current analytical techniques and characterised by FT‐IR spectrometry. The anticorrosive properties of the selected pigments were evaluated following the electrochemical behaviour of a steel electrode in pigments suspensions. In a second stage, solvent‐borne paints with 30 and 10% v/v of the pigment and PVC/CPVC (pigment volume concentration/critical pigment volume concentration) ratio 0.8 were formulated. Three resins were chosen as film forming materials: an alkyd, an epoxy and a vinyl. The performance of the resulting anticorrosive paints was assessed by accelerated (salt spray cabinet and humidity chamber) and electrochemical tests (corrosion potential, ionic resistance and polarisation resistance). The anticorrosive performance of the tested paints was closely related with pigment composition. The nature of the resin was also of importance; in this sense, epoxy paints showed the best anticorrosive performance. Good correlation has been obtained between accelerated and electrochemical tests.

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Pigment & Resin Technology, vol. 30 no. 1
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 1 August 1986

J Boxall

For any paint or coating system performance in service is determined by the whole formulation, with each of the individual ingredients contributing either directly or by…

34

Abstract

For any paint or coating system performance in service is determined by the whole formulation, with each of the individual ingredients contributing either directly or by interaction to the overall balance of film properties. Within these constraints, paint formulators recognise that certain materials have a well defined role to play and in many instances a consideration of a coatings service requirements does largely dictate the initial approach to formulation. One such ‘key’ group of materials are the pigments added to anticorrosive paints to provide protection to metallic substrates under aggressive conditions of exposure. One group of these pigments inhibit corrosion by perturbing in one of a number of ways the chemical reactions that would otherwise occur on the substrate surface in the presence of water. Other types of protective pigments function by improving the barrier properties of the applied paint film so that water cannot readily permeate through and initiate corrosion reactions on the substrate. Pigments in this group typically have a flake‐like particle shape which enables a ‘leafing’ effect to be achieved within the liquid coating after application. The inhibitive types of pigment need to be in close proximity to the substrate to function properly, and accordingly these are normally placed in primer coats only. The flake pigments which reduce moisture permeation through the film are most effective if added in depth, and these are often added to severa or all of the coats comprising a system, or are included as the sole protective pigment in high‐build paints. Recent developments in both of these broad groups of inhibitive and flake pigments will be considered in this article.

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Pigment & Resin Technology, vol. 15 no. 8
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 1 October 1986

J Boxall

The previous three reviews in this series have considered recent developments in the pigments and extenders used in surface coatings; the next two articles will be concerned with…

18

Abstract

The previous three reviews in this series have considered recent developments in the pigments and extenders used in surface coatings; the next two articles will be concerned with the other essential ingredient, the polymer component. The polymer is the media that binds the other constituents of the formulation together and forms an adherent film on the substrate being coated. This vital component also provides many of the necessary chemical, mechanical and durability properties required for the coating to provide an effective level of performance in its service environment.

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Pigment & Resin Technology, vol. 15 no. 10
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 1 June 2003

Antonio D. Jimenez

This study examines the consequences of stigmatization that occurred during a tuberculosis outbreak concentrated among Puerto Rican clients enrolled in a Chicago drug treatment…

443

Abstract

This study examines the consequences of stigmatization that occurred during a tuberculosis outbreak concentrated among Puerto Rican clients enrolled in a Chicago drug treatment center. Using ethnographic methods, I examine three factors that contributed to the stigmatization of those with TB. One factor concerns the fear elicited by the deadly disease that aroused reactions among Puerto Rican community members that were derived from earlier experiences. A second factor involves traditional public health measures enacted in response to the outbreak that facilitating labeling of those with TB, further fueling stigmatization. A third factor concerns the re‐articulation of group boundaries occurring among drug program inhabitants, whereby TB‐impacted persons were marginalized in order to reaffirmed the status of others whose identity had been compromised by the epidemic. The study’s implications for public health are discussed and suggestions are offered for developing innovative intervention approaches.

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International Journal of Sociology and Social Policy, vol. 23 no. 6/7
Type: Research Article
ISSN: 0144-333X

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Article
Publication date: 1 July 1982

Anne J. Walton

Thixotropy can be regarded as the loss of viscosity in a paint or other material that is brought about by mechanical agitation, and where the viscosity continues to decrease…

60

Abstract

Thixotropy can be regarded as the loss of viscosity in a paint or other material that is brought about by mechanical agitation, and where the viscosity continues to decrease provided that this disturbance is continued for a period of time. Conversely, when the mechanical force is removed, the material then increases in viscosity and this recovery toward the initial structure continues to take place over a period of time. Sometimes the time dependency of the viscosity is vanishingly small so that the material is then properly referred to as pseudoplastic. In most of the literature, however, it is not usually possible to differentiate between thixotropy and true pseudoplasticity and therefore both kinds of structure are included in this review as they each are destroyed by mechanical agitation and recover when this is discontinued.

Details

Pigment & Resin Technology, vol. 11 no. 7
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 2 January 2024

Hongjing Dong, Xi Chen, Guangying Yang, Dandan He, Ying Dai and Pengfei He

The purpose of this paper is to obtain a constitutive model of cement-based material in the rheological stage, which owns the different water-cement ratio (w/c) and temperature…

89

Abstract

Purpose

The purpose of this paper is to obtain a constitutive model of cement-based material in the rheological stage, which owns the different water-cement ratio (w/c) and temperature and have a significant impact on the workability of concrete materials.

Design/methodology/approach

It is introduced a modified Arrhenius equation into the Herschel–Bulkley model, which is widely applied in rheological analysis and constructed an ordinary differential equation (ODE) of w/c from the Navier–Stokes equation. By solving the ODE, an approximate constitutive relation of cement-based materials included w/c and temperature is derived. Compared with the experimental results, the present model is validated.

Findings

The shear stress and shear rate curves with different w/c and temperature are simulated by the present method, and the present model can be applied to analyze the changes of apparent viscosity in cement-based material slurry as the w/c and temperature varying.

Originality/value

This work gives a mathematical model, which can effectively approximate the shear stress–shear rate relation with different w/c and temperature in the rheological stage of cement-based material.

Details

Multidiscipline Modeling in Materials and Structures, vol. 20 no. 1
Type: Research Article
ISSN: 1573-6105

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