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The most important of the chlorinated resins used by the paint industry is chlorinated rubber. The product frequently used as a solvent solution contains about 65% chlorine. Films form by evaporation of solvent and these generally have outstanding resistance to weathering, to many chemicals including acids, alkalis, oxidizing agents, and to both fresh and sea water. Chlorinated rubber paints, accordingly, are used for many maintenance situations including swimming pools, masonry and steel surfaces in manufacturing plants, and in a variety of other applications where resistance, protection and long life are important.

The purpose of this study is to investigate the effect of chlorination on the structure and properties of reclaimed rubber and to discuss the feasibility of a novel method to chlorinate reclaimed rubber.

A series of chlorinated reclaimed rubber with different chlorination degrees (CD) was prepared by suspension chlorination in aqueous phase (SCAP). Their structure and performance were characterized by Fourier transform infrared spectrometer, energy dispersive spectroscopy, scanning electron microscopy, thermogravimetric and mechanical property test.

The chemistry structure, mechanical performance and heat resistance of CRR is affected greatly by its CD.

Although in the present work only chlorination of reclaimed rubber is researched, but this method can be used to modify other recycled rubber.

SCAP is a useful method to produce CRR, and it is feasible for production of chlorinated recycled rubber in large scale. The present work provides a new strategy to fabricate new materials based on recycled rubber.

Chlorination of reclaimed rubber by SCAP is useful to convert waste rubber into new materials, and it is useful to decrease environment pollution.

SCAP method provides a new technology to chlorinate waste rubber with many merits, such as chlorination rate of RR is accelerated and the reaction can be controlled or adjusted easily. Moreover, conversion of chlorine is increased remarkably.

A large number of resins and polymers are used as film formers. These have been undergoing modifications to meet the growing demand. One of the modifications involves chlorination and products like chlorinated rubber, chlorinated biphenyls, chlorinated paraffins, chlorinated poly(vinyl chloride), chlorinated polyethylene, chlorinated polypropylene and chlorinated polyether are the result. Besides these well‐established chlorinated products, chlorinated drying and semi‐drying alkyds, chlorinated epoxy esters and chlorinated acrylic polymers have also been studied.

This article describes work carried out in UKAEA laboratories to examine the possibility of using protective coatings on cadmium plate—such as that used to protect mild steel—in order to prevent or minimise corrosion due to hostile organic vapours. The degree of attack by vapours of acetic, formic, butyric and propionic acids and formaldehyde on cadmium has been determined and it has been found that attack can be eliminated in many cases by the application of a chlorinated‐rubber lacquer to the metal. A pretreatment primer of the two‐pack etch‐primer type is considered essential for good protection. The protection provided by nine coatings over three pretreatments is described in detail.

One of the most versatile weapons which the corrosion engineer has at his disposal in his constant war against corrosion is rubber. Both natural and synthetic rubber sheet linings have been used for many years for the protection of tanks and chemical plant, and rubber has also entered the field of acid‐resisting cements in the form of the rubber latex‐hydraulic cement compounds. Both of these techniques have been described in previous issues of this journal, but the fact remains that one of the commonest methods of preventing corrosion is by the application of a protective coating of only a few thousandths of an inch thickness and here again the rubbers play an important part.

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.

The paper aims to evaluate the anti‐corrosion performance of inorganic pigments included in paint systems based on plasticized‐chlorinated rubber for carbon steel in different environmental conditions.

Paint systems based on chlorinated rubber and inorganic pigments such as zinc chromate, zinc phosphate, red iron oxide and treated iron industry waste powder were prepared. Immersion in 3.5 percent salt solution, as well as outdoor exposure tests, were performed and the paint physico‐mechanical properties were tested to evaluate the paints' anti corrosive performance.

The concentration and the type of pigments included in the prepared paint systems control their anticorrosive performance.

The paper demonstrates how pigment consisting of treated iron industry waste powder could be used in anticorrosion paints for carbon steel.

Reports on the preparation of some organic corrosion inhibitors, carried out by the reaction of epoxidized linseed oil free fatty acids with different aliphatic amines under the effect of γ‐ray irradiation. Notes that chemical and instrumental methods were used for identification of the reaction products and that the prepared inhibitors were tested for corrosion protection of steel surfaces by incorporating them in some chlorinated rubber varnishes. Reports that the physical, chemical and corrosion protective properties of the varnish films were studied. Concludes that the prepared inhibitors can be used in small quantities to provide varnishes of excellent adhesion and superior protective properties. Contends, also, that increase of the radiation dose during preparation of the inhibitors and/or during the drying process of the varnish films increases the protective properties of the formed films.

In this special feature details are given of those British paints which can be described as corrosion‐resistant primers, both one‐ and two‐pack. The materials are generally classified according to the base or pigment which actively prevents corrosion—e.g. metallic zinc in zinc/epoxy formulations— or by the base which produces a barrier action against corrosion, e.g. bitumen in bituminous paints. Exceptions to this are the etching primers, which are separately classified. About 300 primers are described, the manufacturers' names and addresses being cross‐indexed and listed separately on page 48.

The purpose of this paper is to study the corrosion protective properties of modified urea and/or thiourea formaldehyde resins for steel surface.

Three butyl alcohol modified amino resins were laboratory prepared. The three modified resins were characterized using thermal gravimetric analysis and infrared; the solid content and refractive index of each were also measured.

The resins that contain both nitrogen and sulphur have excellent corrosion inhibitive activity compared with that containing nitrogen only.

The modified resins were based on urea formaldehyde resin, mixed urea and thiourea formaldehyde resin and thiourea formaldehyde resin, respectively.

The prepared resins were introduced in different coating formulations based on short‐oil alkyd resin, medium‐oil alkyd resin and plasticized chlorinated rubber. They were then tested and evaluated for corrosion protection of steel surfaces.

All the prepared resins show promising results for corrosion protection of steel surfaces.