Synthesis and characterisation of heatproof polyester polyols used in polyurethane adhesive

Abstract

Purpose Presently, a wide range of polyurethane adhesives can be obtained using different kinds of polyols and isocyanates. However, the applied temperature of the polyurethane adhesive is not more than 80°C. The film of polyurethane adhesive will be softened and deformed when its applied temperature is more than 100°C. Thus, the mechanical property of the polyurethane adhesive is decreased clearly, which limits its further application. The purpose of the study is to improve the heat resistance of polyols, especially polyester polyols and its resultant polyurethane adhesives. Design/methodology/approach The more rigid benzene ring is introduced into the polyester polyols to improve the heat resistance of its resultant polyurethane adhesive. Findings The more rigid benzene ring has ben introduced into the polyester polyols and the heat resistance of its resultant polyurethane adhesive is improved. Originality/value The polyester polyols with more rigid benzene ring have been prepared successfully by the vacuum melting method when diethylene glycol, neopentyl glycol, 1,6-hexanediol, ethanediol, isophthalic acid, terephthalic acid, sebacic acid and adipic acid are used as raw materials and tetra-isopropyl titanate is adopted as the catalyst.

Regulating the structure of thermoplastic polyurethane elastomers with a diol chain extender to strength performance

“…It is generally accepted that embedding rigid aromatic structures (e.g., benzene rings) can directly strengthen the hard segments and effectively improve the mechanical properties and heat resistance of TPUs. 26,27 These building blocks with conjugated planes can also weaken the water absorption of corresponding chain extenders through their inherent hydrophobic and π π stacking interactions. 28 To the best of our knowledge, no literature has been reported on adjusting the regularity of TPUs by introducing aromatic structures to improve their performance.…”

Continuous, Free‐Formable Sandwich Design with 3D Fiber Reinforced Core for Increased Lightweight Level of Applications in Large‐Scale Production

“…This is widely used with PUR. During its production, this forms excellent adhesive bonds to many different materials . This is often used for the production of sandwich structures with thin aluminum and steel cover layers .…”