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Moisture cure polyurethanes have been widely used in the adhesive and coating industries. Thermal, mechanical, and surface properties of hyperbranched polyurethane-urea (HBPU) moisture cured coatings have been studied in relationship to chemical structure. [3]
Adhesive treatments include: Reactivation of hide glues. Hide glues, often made from processed cow hides, are a protein-based adhesive commonly used by conservators as the glue is known for both its longevity and reversibility. Hide glues may be reactivated with heat, allowing for repairs to be made where glued joints have begun to loosen. [25]
In the paint and coating industries, paint adhesion testing is often used to determine if the paint or coating will adhere properly to the substrates to which they are applied. Several tests measure the resistance of paints and coatings from substrates: cross-cut test, scrape adhesion, pull-off test , and others.
Stoner's survey on conservators' use of adhesive agents shows that thirty one out of thirty two professionals use BEVA 371 as their lining adhesive. Sixty two percent of these conservators used wax-based adhesives only when necessary. While the data set is fairly small, this is emblematic of a stark shift in attitude across the twentieth century.
Polyurethane is the basis for some construction adhesives in a caulking tube format. [16] On the way to a new and better glue for bookbinders, a new adhesive system was introduced for the first time in 1985. The base for this system is polyether or polyester, whereas polyurethane (PUR) is used as prepolymer.
Polyurethane synthesis, wherein the urethane groups −NH−(C=O)−O− link the molecular units A kitchen sponge made of polyurethane foam . Polyurethane (/ ˌ p ɒ l i ˈ jʊər ə ˌ θ eɪ n,-j ʊəˈr ɛ θ eɪ n /; [1] often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links.