Adhésifs - CTM - Adhesives

CTM Adhesives forme un nouveau partenariat

Wed, 22 Oct 2008 00:35:33 -0400

CTM Adhesives forme un nouveau partenariat avec Quinko-Tek International

Vous pourrez les rencontrer au même kiosque dans le cadre du plus important salon québécois du bois ouvré (SIBO).

Ageing of epoxy adhesive joints

Tue, 14 Oct 2008 16:17:21 -0400

Environmental effects on the ageing of epoxy adhesive joints

Gerald Doylea and Richard A. Pethrick

WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1Xl, UK

Accepted 5 February 2008. Available online 17 February 2008.

Abstract

Adhesive bonded joints are exposed to a range of different environments in aerospace applications. This paper reports dielectric and mechanical analysis of aluminiumepoxy bonded adhesives joints exposed to de-ionized water, aqueous urea solution and salt water at 65 °C. The changes observed are the results of plasticization and corrosion. In the case of the aqueous urea solution, passivation of the oxide by the urea reduced the rate of corrosion. Sea water contains mobile ions and a new feature is detected associated with filiform corrosion. The non-polar media aviation fuel and hydraulic fluid are able to plasticize the adhesive and there is a consequent reduction in the strength of the joint. Propylene glycol, although it is polar solvent, produces limited plasticization and degradation of the joints. Dichloromethane was very aggressive and produced a rapid loss of strength of the joints.

Experimental and analytical investigations

Tue, 14 Oct 2008 16:11:42 -0400

Experimental and analytical investigations of creep of epoxy adhesive at the concreteFRP interfaces

Pania Meshgina, Kyoung-Kyu Choib and Mahmoud M. Reda Tahac,

Department of Civil Engineering, University of New Mexico, 217 Tapy Hall, MSC01 1070, Albuquerque, NM 87131-0001, USA Department of Architectural Engineering, Dankook University, Yongin-city, Gyeonggi-do 448-701, Republic of Korea Department of Civil Engineering, University of New Mexico, 214 Tapy Hall, MSC01 1070, Albuquerque, NM 87131-0001, USA

Accepted 10 January 2008. Available online 3 February 2008.

Abstract

This paper presents the results of experimental and analytical investigations on the long-term behavior of at the interface between the concrete and the fiber-reinforced-polymer (FRP). Double shear experiments under sustained service load were performed on nine specimens composed of two concrete blocks connected by FRP sheets bonded to concrete using epoxy. The primary investigation parameters included the ratio of shear stress to ultimate shear strength, the epoxy thickness and the time-before-loading. Loading was sustained for periods up to nine months. We show that the magnitude of shear stress to ultimate shear strength and the epoxy time-before-loading could be the most critical parameters affecting creep of epoxy at the concreteFRP interfaces. It was also found that the creep of epoxy can result in failure at the interfaces due to the combined effect of relatively high shear stress to ultimate shear strength and thick epoxy adhesive. This can have an adverse effect on the designed performance of reinforced concrete (RC) structures strengthened with FRP. Based on the experimental observations, rheological models were developed to simulate the long-term behavior of epoxy at the concreteFRP interfaces. It is shown that the long-term behavior of epoxy at the interfaces can be properly modeled by analytically for both loading and unloading stages.

Epoxy resins

Tue, 14 Oct 2008 14:40:56 -0400

Epoxy: In chemistry, epoxy or polyepoxide is a thermosetting epoxide polymer that cures (polymerizes and crosslinks) when mixed with a catalyzing agent or hardener. Most common epoxy resins are produced from a reaction between epichlorohydrin and bisphenol-A. The first commercial attempts to prepare resins from epichlorohydrin were made in 1927 in the United States. Credit for the first synthesis of bisphenol-A-based epoxy resins is shared by Dr. Pierre Castan of Switzerland and Dr. S.O. Greenlee of the United States in 1936. Dr. Castan's work was licensed by Ciba, Ltd. of Switzerland, which went on to become one of the three major epoxy resin producers worldwide. Ciba's epoxy business was spun off and later sold in the late 1990s and is now the advanced materials business unit of Huntsman Corporation of the United States. Dr. Greenlee's work was for the firm of Devoe-Reynolds of the United States. Devoe-Reynolds, which was active in the early days of the epoxy resin industry, was sold to Shell Chemical (now Hexion, formerly Resolution Polymers and others).

Wikipedia, the free encyclopedia

Adhesive

Tue, 14 Oct 2008 09:00:00 -0400

Adhesive substance capable of sticking to surfaces of other substances and bonding them to one another. The term adhesive cement is sometimes used in place of adhesive, especially when referring to a synthetic adhesive. Animal glue, a gelatin made from hides, hooves, or bones, was probably known in prehistoric times; it remained the leading adhesive until the 20th cent. It is now used especially in cabinetmaking. Animal glue is sold both as a solid (either ground or in sheets, to be melted in a water-jacketed glue pot and applied while hot) and as liquid glue (an acidic solution). Adhesives from vegetable sources are also important; they include natural gums and resins, mucilage, and starch and starch derivatives. They are commonly used for sizing paper and textiles and for labeling, sealing, and manufacturing paper goods. Other adhesives derived from animal and vegetable sources include blood glue, casein glue, fish glue, rubber adhesives, and cellulose derivatives. Adhesives having special properties are prepared from synthetic resins. Some synthetic adhesives, such as the epoxy resins, are strong enough to be used in construction in place of welding or riveting. Adhesive tapes have a coating of pressure-sensitive adhesive.

Bibliography: See I. Skeist, ed., Handbook of Adhesives (1962); N. A. de Bruyne and R. Houwink, ed., Adhesion and Adhesives (2 vol., 2d ed. 1965-67); A. J. Kinloch, Adhesion and Adhesives: Science and Technology (1987).

Author not available, ADHESIVE., The Columbia Encyclopedia, Sixth Edition 2008

Adhésifs - CTM - Adhesives

CTM Adhesives forme un nouveau partenariat

CTM Adhesives forme un nouveau partenariat avec Quinko-Tek International

Ageing of epoxy adhesive joints

Environmental effects on the ageing of epoxy adhesive joints

Abstract

Experimental and analytical investigations

Experimental and analytical investigations of creep of epoxy adhesive at the concreteFRP interfaces

Abstract

Epoxy resins

Adhesive

Experimental and analytical investigations of creep of epoxy adhesive at the concreteFRP interfaces