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Additions for use in polyurethane coatings. Angus Chemie GmbH has announced the introduction of two new additions to its product line for polyurethane coatings. Zoldine RD‐20…
Abstract
Additions for use in polyurethane coatings. Angus Chemie GmbH has announced the introduction of two new additions to its product line for polyurethane coatings. Zoldine RD‐20 Reactive Diluent is designed to replace higher viscosity polyols in high solids polyurethane coatings. Zoldine MS‐Plus Moisture Scavenger eliminates bubbles, pinholes, downglossing and hazing in polyurethane coatings to allow for fast cure times in all types of weather.
The use of metallic coatings as a protection against corrosion is a subject of considerable antiquity. Cladding and inlaying with gold, silver, and electrum was practised during…
Abstract
The use of metallic coatings as a protection against corrosion is a subject of considerable antiquity. Cladding and inlaying with gold, silver, and electrum was practised during the Byzantine and early Egyptian civilisations—the tinning of cast iron and copper vessels was known to be established prior to the birth of Christ by the Romans, to whom must also be attributed the lead cladding of ferrous fittings intended for service in marine environments. Metallic coatings can be produced by a wide variety of methods, and on the technique selected depends certain of the factors which control the protective value of the coating, e.g. thickness, uniformity, porosity, adhesion, and purity. Since the type of process used is often restricted by the nature of the article or component to be treated, it is intended to precede a description of the properties of the various metal coatings by a general discussion of the more important methods of coating application.
THE Glacier Metal Co Ltd manufacturers three dry bearing materials, namely Glacier DU, DQ and Deva Metal.
Songying Mo, Manni Mo and Kai-Chiu Ho
Under extremely cold weather, traditional winter clothing may not be adequate to keep warm in the harsh environment. The paper aims to discuss this issue.
Abstract
Purpose
Under extremely cold weather, traditional winter clothing may not be adequate to keep warm in the harsh environment. The paper aims to discuss this issue.
Design/methodology/approach
Wearable heat-generating (electric heating) clothing which covers the thermal sensitive zone of the human body can protect the human body from hypothermia. Existing heatable jacket in the market using carbon fiber is relatively expensive, complicated and require a lengthy manufacturing time.
Findings
Through experimental evaluation, the textile treated by plasma-assisted metal coating (PAC) has demonstrated excellent stability in temperature during the heating process.
Originality/value
This paper introduces an innovative, low-cost PAC technology using optimized plasma-assisted metallic deposition that is able to preserve the physical properties of the textile.
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The aerospace industry relies heavily on protective treatments and processes to ensure that the structural integrity of an aircraft is not degraded in service as a result of…
Abstract
The aerospace industry relies heavily on protective treatments and processes to ensure that the structural integrity of an aircraft is not degraded in service as a result of operating under harsh corrosive conditions. Many of the chemicals and processes currently employed in metal finishing have been found to cause pollution and long‐term damage to the environment. Legislation and international agreements are now in place which ultimately will lead to a ban or major reduction in the use of many of these processes and coatings. The aircraft constructors and operators are seeking to adopt new protective schemes and treatments which will satisfy future environmental requirements.
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Hassan S. Emira, Alia A. Shakour, Sayed S. Abd El Rehim, Inas A. Saleh and Mohammed A. El‐Hashemy
The purpose of this paper is to report the use of zinc phosphate pigment as a chromate substitute for coatings on non‐ferrous metals (galvanized steel, pure aluminum, α‐brass and…
Abstract
Purpose
The purpose of this paper is to report the use of zinc phosphate pigment as a chromate substitute for coatings on non‐ferrous metals (galvanized steel, pure aluminum, α‐brass and pure copper).
Design/methodology/approach
Paint systems based on zinc chromate and zinc phosphate pigments were prepared. The paints were tested for their physico‐mechanical properties. Testing of the anticorrosive properties of the zinc phosphate pigment in comparison with zinc chromate pigment was carried out by accelerated corrosion exposure, i.e. immersion in 3.5 percent salt solution and exposure for one year at five outdoor stations.
Findings
The possibility of replacing chromate pigment was assessed and the “gap“ observable between the performance of zinc chromate and zinc phosphate pigments was noted.
Originality/value
The non‐toxic inhibitive pigment, zinc phosphate, incorporated into a plasticized‐chlorinated rubber binder, could be applied successfully for the protection of non‐ferrous substrates.
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Abstract
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R.A. Mhatre, P.A. Mahanwar, V.V. Shertukde and V.A. Bambole
The paper's aim is to synthesise ultraviolet (UV) curable polyurethane acrylate based on polyester polyol and to study change in its mechanical, chemical, optical and weather…
Abstract
Purpose
The paper's aim is to synthesise ultraviolet (UV) curable polyurethane acrylate based on polyester polyol and to study change in its mechanical, chemical, optical and weather resistance properties with varying amount of nanosilica. It also seeks to determine its optimum loading levels for property maximisation.
Design/methodology/approach
New UV curable polyurethane acrylate has been synthesised using polyester polyol, blend of isophorone diisocyanate and toluene diisocyanate and hydroxyl ethyl acrylate. This resin was incorporated with nanosilica (1‐3 per cent) on the basis of total solids. The newly synthesised material was characterised by fourier transform infrared spectroscopy, gel permeation chromatography, X‐ray diffraction and scanning electron microscopy. The mechanical, chemical and optical properties of the coating films were studied and compared.
Findings
The hardness, tensile strength and abrasion resistance show significant enhancement with increasing amount of nanosilica. It is also found that UV cured polyurethane acrylate nanocoating exhibited improved weather resistance. The optimum concentration of nanosilica for better performance is found to be 3 per cent of total solids. The improvement is the result of inherent nature of nanosilica.
Research limitations/implications
Nanosilica used in present context is having 10 nm mean diameter and near about 600 m2/g surface area. Nanosilica having different particle size, surface area and surface modification can be used to improve more specific properties.
Practical implications
Addition of nanosilica particles to polyurethane acrylate coating is a simple and inexpensive method resulting in phenomenal increase in properties.
Originality/value
The new organic‐inorganic hybrid nanocoating with improved weather resistance was synthesised. These coatings could find applications in demanding fields such as automotive topcoats.
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Abstract
Purpose
The purpose of this paper is to report a new method, the dissolution‐precipitation process, to prepare nylon‐coated metal powders for the indirect selective laser sintering (SLS) process.
Design/methodology/approach
The nylon‐12 coated carbon steel powders were prepared by the dissolution‐precipitation process. The powder characteristics are examined by scanning electron microscope (SEM) and laser diffraction particle size analysis. The effect of the applied laser energy density on the three‐point bend strength and dimensional accuracy of the SLS specimens are studied. The influence of nylon‐12 content on the bend strength are also investigated.
Findings
The SEM and laser diffraction particle size analysis results indicate that the steel particles are well coated by nylon‐12 resin. The bend strength of the SLS specimens increases with increasing the applied energy density until it reaches a maximum value, and then further increasing energy density will cause the decrease in the bend strength. The bend strength of the SLS specimens increases with increasing the nylon‐12 content over the investigated range. The dimensional errors in the X‐Y‐and Z‐directions are all increased with the increase in energy density.
Research limitations/implications
This paper only concerns the preparation and SLS of the coated powders. Further investigations are planned into post‐processing, such as binder decomposition and high‐temperature sintering, of the green parts made from the coated powders.
Originality/value
This paper provides a useful method for preparing nylon‐coated metal powders for making metal parts by the indirect SLS process.
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