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Formaldehyde emission free adhesives
Formaldehyde emission free adhesives
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Formaldehyde emission free adhesives
The conventional phenolic resin used for bonding plywood requires longer curing time, when allowed to cure at room temperature , their by reducing the production rate . The emission of formaldehyde from the products are also posing problems in the international market. Hence there is a need to have an alternate resin system which is free from formaldehyde and which can cure at faster rate at room/intermediate temperature. Hence investigations to develop polyurethane adhesives for bonding wood and bamboo based products including the surface coating dispersions are being carried out at IPIRTI.
Polyurethane adhesives and sealants provide strong bonding and tight seals in a variety of applications. Polyurethane adhesives provide the advantage of a rapid development of "green strength," where the adhesive provides an initial bond before fully curing. This reduces the need for clamping and holding materials, thereby cutting costs and increasing manufacturing and construction flexibility. Since polyurethane chemistry is so versatile, custom adhesives and sealants displaying a wide variety of chemical and physical properties can be manufactured.
The need to protect surfaces from early deterioration has been an issue that has been debated for many years. With the rapid industrialization that is taking place in the country, pollution is likely to be one of the causes for shortening the life of concrete structures. Unless protected, the replacement cost of these structures can become phenomenal. Water-based polyurthanes , can be tailored to suit every single application.
Polyurethane coatings are applied to products to improve their appearance and lifespan.
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