Polyurethanes for Flexible Surface Coatings and Adhesives

Abstract

Polyurethanes can be tailor-made for a wide range of flexible surface coatings, e.g., for textile substrates and leather; and for a wide variety of adhesives. Polyurethanes give unexcelled performance in almost all of these applications. A prime target of coating textiles with polyurethanes is the achievement of the quality of natural leather. A highly water vapor permeable, but water repellent textile coating has recently become possible using a direct coating process. The application of a micro porous polyurethane film on split leather by a reaction process leads to prime quality leather for shoe uppers. For many years, elastomenc polyurethanes have been the top-ranking adhesives for highly plasticized PVC articles. More recently, polyure thanes have been introduced into the market as structural adhesives, especially for the bonding of automotive body parts. A new principle of heterogeneous cross-linking of polyurethanes which has potential for one-package structural adhesives is pre sented. Aqueous polyurethane dispersions can also be tailor-made for the whole range of two-dimensional applications. They complement the high solids and the powder polyurethane coatings, as well as the solvent-free polyurethane adhesives in the fulfillment of ecological and industrial hygiene requirements.

Fabrication and characterization of polyurethane-coated fabrics for collapsible diesel tanks

“…It is observed that the percentage elongation increases with increase in the molecular weight of polyurethanes [3,4].…”

“…Each of these three has a direct bearing on the properties of the polyurethanes synthesized. The polyols and diisocyanates form the backbone of the molecular chain of the polymer, which is responsible for its ultimate performance properties such as mechanical properties, abrasion resistance,¯exural endurance and resistance to chemicals and hostile environments [3,4]. The end use requirement is met by varying these three types of material.…”

“…F 1 ®lm formed from low molecular weight (M w 1000) polyurethane F 2 ®lm formed from medium molecular weight (M w 2000) polyurethane F 3 ®lm formed from high molecular weight (M w 3000) polyurethane Fa virgin fabric Fa 1 fabric coated with low molecular weight (M w 1000) polyurethane Fa 2 fabric coated with medium molecular weight (M w 2000) polyurethane Fa 3 fabric coated with high molecular weight (M w 3000) polyurethane…”

Impact on peel strength, tensile strength and shear viscosity of the addition of functionalized low density polyethylene to a thermoplastic polyurethane sheet calendered on a polyester fabric

“…These properties make TPU an attractive material for coated textiles (9) or for leather like products (10). These TPU coated textiles are used for inflatable boats, flexible tanks or more technical applications like Lighter-Than-Air systems for high altitude applications (11).…”

Influence of Hard Segment on Thermal Degradation of Thermoplastic Segmented Polyurethane for Textile Coating Application

“…In the application of breathable-coated fabrics, the polyurethane film has become an important element [11][12][13][14][15] . However, these materials are generally not thermally very stable, especially above their softening temperature [16,17] .…”