Influence of cycloaliphatic compounds on the properties of polyurethane coatings

Abstract

A series of polyester polyol resin was synthesized by using 1,4-cyclohexanedimethanol (1,4-CHDM) and three different diacids: 1,3-cyclohexanedicarboxylic acid (1,3-CHDA), isophthalic acid (IPA) and adipic acid (AA). The solubility and viscosity of the polyester polyols were determined by using methyl ethyl ketone (MEK). All the polyester polyols were crosslinked with hexamethylene diisocyanate (HDI) isocyanurate to form polyurethane coating films. These films were evaluated for their mechanical and chemical resistance properties. Studies on the film characteristics revealed that the polyurethane films based on cycloaliphatic diacid generally showed comparatively better performance properties than the polyurethane film based on aromatic and linear aliphatic diacids in general.

Review on hygroscopic aging of cellulose fibres and their biocomposites

“…In the 1950s polyurethanes (PU) were introduced as coating resins and subsequently expanded in their application (Awasthi & Agarwal, 2007). They have been used typically for aircraft top-coats, plastics, automotive top-coats and wood because of their excellent chemical and mechanical properties.…”

“…The difference between the polyether and polyester polyols is their industrial production which differ in their monomer compositions, for instance polyether polyols are limited to tetrahydrofuran, ethylene, propylene and butylene oxides. On the other hand, polyester polyols are products of alcohols and organic acids which can be produced from different combinations of monomers and this further adds a great value to the polyurethane products (Awasthi & Agarwal, 2007. So far polyurethanes produced industrially are usually petroleum based polyol.…”

“…The chemical and water resistance improved with greater molar ratios of 1,4-CHDM or TMP. In the case of Awasthi and Agarwal (2007) polyester polyols resin were synthesized with three diacids and further crosslinked with hexamethylene diisocynate …”

“…The mechanical properties improved with increase HBPU content as a result of enhanced molecular interactions brought by the amount of hydrogen bonding and aromatic Table 5 Resistance to water a of polyurethane films. Reprinted from Awasthi and Agarwal (2007), Open Access.…”

Amorphous polyamide coating resins from sugar-derived monomers

“…These polyesters are typically based on bifunctional monomers, e.g., terephthalic acid, isoph-thalic acid, adipic acid, neopentyl glycol, and ethylene glycol, with the addition of a small percentage of trifunctional monomers, e.g., trimellitic anhydride and trimethylolpropane. [8][9][10] These compounds are derived from petrochemicals. With depleting oil reserves, efforts are made to replace these starting materials with bio-based alternatives to create more sustainable polyesters.…”