B.K. Chakraborty, S. (Mrs.) and A.K. Vasishtha
In surface coatings, no single resin binder possesses all the desirable properties. It is, therefore, a general practice to blend different polymers or copolymers having suitable…
Abstract
In surface coatings, no single resin binder possesses all the desirable properties. It is, therefore, a general practice to blend different polymers or copolymers having suitable complimentary properties in order to get the desired film characteristics provided that the blended polymers are compatible with each other. Hence, a wide range of performance characteristics can be achieved by blending.
M.I. Khan, S. Chandra and A.K. Vasishtha
Lacquers based on polystyrene and polyvinyl chloride resins were prepared by blending the two resins in various proportions. Their properties were evaluated and compared with…
Abstract
Lacquers based on polystyrene and polyvinyl chloride resins were prepared by blending the two resins in various proportions. Their properties were evaluated and compared with those of a commercial leather lacquer based on polyvinyl chloride resin of organosol type. It was found that some of the blends proved to be comparable and even superior, in some respect, to the commercial sample.
J.K. Vinaik, S. Chandra and A.K. Vasishtha
Polycarbonate was incorporated in castor oil and nigerseed oil alkyds of various oil lengths. Compatibility of polycarbonate with these alkyds was investigated. It was found that…
Abstract
Polycarbonate was incorporated in castor oil and nigerseed oil alkyds of various oil lengths. Compatibility of polycarbonate with these alkyds was investigated. It was found that only a small amount (4 to 10%) of polycarbonate could successfully be blended with these alkyds. Film properties of these blends were examined and compared with those of amino alkyd blends, in order to determine the usefulness of the polycarbonate alkyd blends. It was observed that polycarbonate modified alkyds, even with a small amount of polycarbonate were superior in film properties as compared to amino modified alkyds, especially with respect to chemicals and physical properties.
Sushil Chandra and (Miss) Kiran Batra
Polybisphenol phthalate was synthesized by the melt poly condensation process and its physical and spectral data were determined. It was blended in different proportion with…
Abstract
Polybisphenol phthalate was synthesized by the melt poly condensation process and its physical and spectral data were determined. It was blended in different proportion with linseed alkyds of various oil length. Film properties of these blends were studied and were compared with those of plain linseed alkyds. It was observed that chemical properties of the blends, containing 10 and 25 per cent polybisphenol phthalate were superior to those of the plain alkyds and the blends containing 50 per cent polybisphenol phthalate. The mechanical properties such as scratch hardness of the polybisphenol phthalate alkyd blends were inferior to those of the plain linseed alkyds.
Sushil Chandra and Suman Pasari
In order to obtain desired film properties, alkyd resins are frequently modified by other resins and polymers either by physically blending them or chemically incorporating them…
Abstract
In order to obtain desired film properties, alkyd resins are frequently modified by other resins and polymers either by physically blending them or chemically incorporating them. Some of the recent physical modifications of alkyd have already been described in the first part of the article. In this second part, the different types of resins and polymers used for the chemical modifications of alkyd resin are reviewed. A critical discussion on generally recognised advantages and disadvantages of the resultant coating from each modifier is described. Their use in surface coating industry are enumerated. Types of modifier to be used for improving a particular property in the coating are also suggested.
Darla Daniel‐O'Dwyer, Leslie Thompson, Brent Shriver, Chih‐kang Wu and Linda Hoover
The purpose of this study is to compare the oxidative stability of non‐hydrogenated cottonseed oil with that of the partially hydrogenated oils commonly used as a deep‐fat frying…
Abstract
Purpose
The purpose of this study is to compare the oxidative stability of non‐hydrogenated cottonseed oil with that of the partially hydrogenated oils commonly used as a deep‐fat frying medium by the restaurant industry when used to prepare French fries in order to reduce trans‐fatty acids.
Design/methodology/approach
Stability characteristics of non‐hydrogenated cottonseed oil and two hydrogenated oils, canola and soybean, were evaluated in deep‐fat frying applications. French fries were analyzed for total polar compounds, and the oils were analyzed for iodine, peroxide, p‐anisidine and totox values, and free fatty acids.
Findings
Canola and soybean oil had significantly lower iodine values than cottonseed oil. Free fatty acid values were not significantly different among the oils (0.256 per cent oleic acid). Initially cottonseed oil had higher peroxide, p‐anisidine, and totox values compared with canola and soybean oil. However, as days of frying increased, values trended closer together. Total polar compounds were similar. All oil types were comparable in terms of their stability characteristics under the conditions used in this study.
Research limitations/implications
Research with additional food product and under more stressful conditions would be beneficial.
Practical implications
Hydrogenation increases trans‐fatty acid content. Consumption of trans‐fatty acids has been associated with increased risk of heart disease. Non‐hydrogenated cottonseed oil may be a viable alternative to popular hydrogenated oils currently used in the restaurant setting.
Originality/value
Restaurants are being pressured by health officials to choose healthier oil. This research article can help restaurants make an informed choice.
Details
Keywords
The commercial success of electro‐deposition of aqueous coating is mainly concerned with the development of water‐soluble film forming polymers. The field of these water‐soluble…
Abstract
The commercial success of electro‐deposition of aqueous coating is mainly concerned with the development of water‐soluble film forming polymers. The field of these water‐soluble polymer systems for surface coating application is growing rapidly and expanding vigorously and they are destined to play a leading role in the near future. This may be mainly attributed to regulations on emissions, environment and ecology. In doing so, the electrodeposition technique offers a remarkable assistance to these systems at comparatively low cost, low energy requirement and high utilization efficiency. Research workers have done work on water‐soluble alkyds, epoxies and acrylics.
Polybisphenol maleate was prepared by the reaction of bisphenol diacetate and maleic acid and its molecular weight, relative viscosity, solubility and melting points were…
Abstract
Polybisphenol maleate was prepared by the reaction of bisphenol diacetate and maleic acid and its molecular weight, relative viscosity, solubility and melting points were determined. Its structure was confirmed by spectral and chemical analysis. It was incorporated physically and chemically into linseed oil alkyds and resulting products were termed as physical blends and copolyesters respectively. Film properties of blends and copolyesters were studied and compared with those of plain linseed oil alkyds. It was found that copolyesters were superior in film properties to those of plain linseed oil alkyds, and blends were up to some extent.
Sushil Chandra and Suman Pasari
Alkyds are the work horse of paint industry. In order to obtain desired film properties, alkyd resins are frequently modified by other resins and polymers either by physically…
Abstract
Alkyds are the work horse of paint industry. In order to obtain desired film properties, alkyd resins are frequently modified by other resins and polymers either by physically blending them or chemically incorporating them. Some of the recent physical modifications of alkyds have been described in this first part of the article. The chemical modifications will be described in the second part.
The acute shortage coupled with tremendous increase in cost of various solvents used by paint industry and pollution becoming a serious concern has resulted in intensive study of…
Abstract
The acute shortage coupled with tremendous increase in cost of various solvents used by paint industry and pollution becoming a serious concern has resulted in intensive study of water‐borne coatings. Water‐borne coatings ideally meet the needs for coating systems which do not cause atmospheric pollutions and at the same time help in conservation of precious and renewable petroleum resources. Many research workers have developed water‐soluble epoxies, alkyds and acrylics to make water‐based surface coatings.