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An introduction to the topic of aqueous silicone resin coating systems for exterior masonry. Concentrates on applications in the construction industry.

This article presents a study of the major corrosion problems of steel structures in rubber and palm oil mill industries in Malaysia. Such structures, improperly coated with protective treatment (commercial coatings) were easily damaged by corrosion due to the environment within a month’s time. In order to prevent these types of corrosion problems, the epoxy‐silicone resin based paints were developed. The performance of the coatings were evaluated. These studies confirm the fact that the epoxy‐silicone coatings are effectively useful for protection of steel structures in these industries for considerably longer times.

The purpose of this paper is to investigate the heat resistance properties of silicone‐acrylic hybrid system on cold rolled mild steel panel.

The presence of Si−C bonds in hydroxyl functional solid phenyl‐methyl silicone should be able to improve heat resistance properties of silicone‐acrylic polyol coating. Different weight ratios of silicone resin and acrylic polyol resins were blended in order to obtain the composition for optimum thermal properties. Thermal stability of silicone based protective coatings has been investigated by means of potential time measurement (PTM) and electrochemical impedance spectroscopy (EIS) techniques.

The blending of silicone intermediate resin with acrylic polyol resins. The coating consisting of 30 per cent silicone resin and 70 per cent acrylic resin showed significant improvement of heat resistivity compared to pure acrylic polyol resins on cold roll mild steel panels. This study demonstrates an interesting correlation between PTM and EIS studies.

Findings may be useful in the development of heat resistant paints.

The blending method provides a simple and practical solution to improve the heat resistance properties of acrylic polyol resins.

Durability and functionality of the coating, critically depend on the strength and adhesion properties of the materials. This may be a useful source of information for the development of organic‐inorganic coatings.

Surfex '88 is the first UK exhibition with the new Akzo Corporate Identity to operate in a more market orientated structure. Within the chemical division of Akzo a group has been formed to promote the wide range of Akzo chemicals for coatings applications. Among the products that can be discussed will be:

‘The Protection of Ferrous Metals’ was the title of an exhibition, the first of its type in the United Kingdom, organised by the Corrosion Group of the Society of Chemical Industry at Battersea Polytechnic, London, on January 22, 1954. This division of the Society was formed in 1951 to meet the need for a scientific society to deal specifically with the study of corrosion and its prevention.

WITH many new alloys being developed from various metals for aeroplane construction, fresh and difficult problems are being encountered in the endeavour to acquire for these metals the sort of background that has been achieved for the aluminium alloys. One of the problems encountered has been the lubrication and protection of such metals during hot forming and heat treatment at very high temperatures and one lubricant that has been developed by Boeing Airplane Company, of Seattle, Wash., U.S.A. in this connection has been of the ceramic family.

During the last year the use of rubber and its derivatives as anti‐corrosive lining agents has been brought into what might be called ‘daily newspaper prominence’ by the completion of two projects using vast quantities of these materials. These projects—the lining of the various parts of the Associated Ethyl Co.'s bromine plant at Amlwch, Isle of Anglesey, and the preparation of the ‘world's largest rubber bag’ for the Mill Hill reservoir at Easington, Co. Durham—are striking examples of the development of this branch of chemical engineering. However, although it is only recently that such large amounts of rubber have been used in single undertakings, this does not minimise the important position which this extremely adaptable material has held for very many years in anti‐corrosive work.

To evaluate the degradation of silicone based coatings that protect the mild steel surfaces from corrosion in high temperature atmospheres, the coatings were exposed to muffle furnace for heating ‐ cooling cycle (as per ASTM specification D 2485) up to 700°C. The ability of the paint film to withstand the temperature is related to its resistance as well as microcracks. These factors are very useful in precisely quantifying the degree of deterioration of the protective film. In the present work, two types of silicone based paints (silicone‐titanate, rhodorsil silicone) were prepared and the surface degradation of these coatings were studied by EIS technique and SEM with EDAX analysis. The chemical resistance properties were also analyzed.

Finzel (American Paint and Coatings Journal, January 19 (1981) p. 19; Metal Finishing, June (1982) p. 49) has authored two review articles on silicones. He points out that silicones are mature products having first been introduced over thirty years ago. Their major use in the coatings field is for maintenance to provide protection against weathering, temperature extremes, and corrosive atmospheres. Silicones, when combined with other vehicles, impart increased resistance to moisture, chemicals, ultraviolet degradation, thermal shock, chalking, fading, and peeling. The major use, however, for silicones is for high temperature coatings as reactive intermediates and as paint additives.