DOI: https://doi.org/10.55373/mjchem.v26i6.46

Keywords: Polyurethane grouting; ratios; polyol & isocyanate; physical properties; morphology properties

Abstract

Malaysian infrastructure projects are experiencing a 43 % increase in the usage of polyurethane materials owing to their adaptability, long lifespan, and affordability. The mixture of polyol and isocyanate, as polyurethane (PU), possesses exceptional qualities that make it an ideal grouting material. These include being lightweight, durable and flexible, while resistant to abrasion, chemicals and weather. The primary challenges associated with the production of polyurethane are shrinkage, high absorption, and durability under high pressure due to unbalanced ratios of polyol and isocyanate. However, these challenges can be overcome using appropriate ratios. In this study, to achieve the optimum result for grouting applications, polyurethane was synthesised utilising different ratios of polyol and isocyanate (0.5:1, 1:1, and 1:0.5). The samples were tested for their physical, water absorption, and morphological properties. With a moisture absorption of less than 12 %, the product of the 1:1 ratio showed good performance in water-resistant, rigid, durable and good hydrophobicity characteristics, with a lower viscosity and weight than the other samples. In addition, the closely packed foam cells were observed in the morphology of the 1:1 ratio polyurethane sample. Through a partnership with Al Fazance Resources, polyurethane-related issues related to grouting materials used in Malaysia's construction sector may be improved.