Adhesives and Sealants - Technology, Applications and by David Dunn

By David Dunn

This particular document covers either technical and marketplace info on adhesives and sealants in a single quantity. It presents a very good research of the cutting-edge within the adhesives and sealants undefined. it's in actual fact written and should be of curiosity to specialists, designers and end-users. The file covers international industry information and specializes in Western Europe and North the US, with additional info concerning the rising markets within the a ways East and Latin the United States. It offers a very good, transparent assessment of the total of the adhesives and sealants from construction and production the right way to industry purposes, new expertise, key businesses and power for development.

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Thus, it is very important in adhesives to keep the components very dry to ensure maximum reaction of hydroxy and isocyanate groups and minimise void formation caused by CO2 evolution. Linear thermoplastic polyurethanes may be obtained by using compounds with two reactive groups such as diisocyanate and diols. Crosslinkable systems can be formed in one of two ways – either by using an excess of isocyanate in the reactions where the excess isocyanate can react with urethane groups in the polymer to form allophanate crosslinks, or by using multifunctional polyols or isocyanates.

32 Adhesives and Sealants – Technology, Applications and Markets Polyurethane aqueous dispersion adhesives are high molecular weight polyurethanes dispersed in water. They are applied and used in exactly the same manner as solvent-borne systems with the benefit of not using hazardous or flammable solvents. 1 One-Component Adhesives There are two types of adhesives in this category - moisture cured products and heat cured products. Moisture cured products use a liquid isocyanate-terminated polyurethane with a relatively high molecular weight and a prepolymer with a low residual isocyanate content.

44 Adhesives and Sealants – Technology, Applications and Markets Products made with phenol-formaldehyde, have proven to be more durable than wood when exposed to warm and humid environments, water, alternate wetting and drying, and even temperatures sufficiently high to char wood. These adhesives are entirely adequate for use in products that are exposed indefinitely to the weather. Phenolic resins are also used as high temperature adhesives in the production of automotive disk brake pads and abrasive products.

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