Introduction to polyurethane glues

Polyurethane glues are chemical adhesives formulated from polyurethane polymers that are widely used in the construction, carpentry and manufacturing industries. These adhesives are characterized by their high mechanical resistance, excellent adhesion to a wide variety of materials and their ability to form durable and flexible joints.

Their chemical formulation gives them unique properties, such as resistance to water, chemicals and temperature changes, making them ideal for both interior and exterior applications. Furthermore, polyurethane glues can be single-component or two-component, adapting to different technical needs and production processes.

Chemical base and main components

Polyurethane glues are mainly composed of polyurethane prepolymers, which are formed through the chemical reaction between diisocyanates and polyols. This reaction gives rise to a polymeric structure that can be formulated to have different mechanical and chemical properties.

In addition to prepolymers, these glues include additives such as catalysts, curing agents, plasticizers, and modifying agents to optimize the viscosity, setting time and final strength of the adhesive. The exact formulation varies depending on the manufacturer and the specific use of the product.

Common diisocyanates in the manufacture of polyurethane glues include toluene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI), although the choice depends on toxicity and performance requirements.

Classification according to its component

Polyurethane glues can be classified as one-component and two-component. The monocomponents contain all the necessary ingredients and cure upon contact with ambient humidity, which facilitates their application and handling on site.