Polyurethane Adhesive Formulation Analysis: Component Reconstitution, Content, and Proportion Testing

Polyurethane adhesives are a type of adhesive containing urethane groups and isocyanate groups, characterized by high reactivity and room-temperature curing capability. They can bond various materials such as metal, rubber, glass, ceramic, plastic, and wood, and exhibit excellent resistance to impact, vibration, and bending fatigue, as well as high peel strength. The characteristics of polyurethane adhesives include good low-temperature resistance but poor water resistance and heat resistance.

The formulation of polyurethane adhesives typically includes polyether-type polyurethane prepolymers (containing free isocyanate groups), 3,3-dichloro-4,4'-diaminodiphenylmethane (MOCA), etc. The preparation process involves reacting polyether polyols with diisocyanates, followed by the addition of MOCA to synthesize the prepolymer.

The formulation of water-based polyurethane adhesives includes carboxylic acid-type water-based polyurethane, di-n-butyl phthalate, xylene, sodium dodecylbenzenesulfonate, and other components. The proportions and selection of these components affect the adhesive strength, temperature resistance, water resistance, and other properties of the adhesive.

The formulation of single-component polyurethane adhesives may include high-activity polyether polyols, MDI, tertiary amines, and organic tin catalysts. These components, when mixed in specific proportions, can form a prepolymer containing fillers for specific bonding applications.

Polyurethane adhesives come in a wide variety of types, including two-component and single-component formulations, as well as different curing methods such as solvent-based, solvent-free, hot-melt, and water-based. They have extensive applications in various fields such as the transportation industry, packaging and printing industry, and industrial assembly industry.

In summary, the formulation analysis of polyurethane adhesives involves the selection and adjustment of various components to meet different application requirements and performance specifications. These components include, but are not limited to, polyether-type polyurethane prepolymers, isocyanates, catalysts, and fillers.

Knowledge Analysis Technology utilizes scientific instruments such as spectroscopy, chromatography, energy spectroscopy, and mass spectrometry, employing multi-modal analytical methods to provide services including component analysis, failure analysis, comparative analysis, and foreign material analysis for chemical industry products. This helps clients analyze the chemical composition and component content of samples, or conduct qualitative and quantitative analysis of specified components and their content according to client requirements, as well as identify raw materials, specific components, content, and foreign material components.