Polyols are also used in the production of coatings, adhesives, sealants, and elastomers (CASE), which are used in a wide range of applications such as automotive, construction, packaging, and electronics. Polyols used in CASE applications can be divided into two main categories: polyester polyols and polyether polyols.
Polyester Polyols: Polyester polyols are commonly used in the production of CASE materials due to their high resistance to chemicals, solvents, and weathering. These polyols are typically made by the reaction of a diol or triol with a dicarboxylic acid or anhydride, and they have a more rigid, hydrophobic structure than polyether polyols. They are used in a wide range of applications, including coatings for metal, plastic, and wood substrates, as well as adhesives and sealants for construction and industrial applications.
Polyether Polyols: Polyether polyols are also used in the production of CASE materials, particularly in applications that require flexibility and good mechanical properties. These polyols are typically made by the reaction of a polyfunctional alcohol such as glycerol or trimethylolpropane with an alkylene oxide such as propylene oxide or ethylene oxide. They have a flexible, hydrophilic structure that allows for the production of CASE materials with good adhesion, low viscosity, and high elasticity. Polyether polyols are used in a wide range of applications, including coatings for textiles, flexible packaging, and adhesives and sealants for automotive and aerospace applications.
Polyols are important building blocks in the production of CASE materials, and their choice depends on the specific application requirements, such as resistance to chemicals, weathering, flexibility, and adhesion. Polyester polyols are commonly used in applications that require high chemical resistance, while polyether polyols are used in applications that require flexibility and good mechanical properties.
