Hot melt adhesive, also known as hot glue, is a thermoplastic adhesive that changes its physical state with temperature variations within a certain range. It solidifies at low temperatures and becomes flowable at high temperatures while maintaining its chemical properties unchanged. It is non-toxic, odorless, and considered an environmentally friendly chemical product. Due to its solid nature, it is convenient for packaging, transportation, and storage, and it is solvent-free, non-polluting, and non-toxic. Additionally, its simple production process, high added value, strong bonding strength, and fast bonding speed make it highly favored.

Currently, the rosin industry mainly processes rosin resins for the hot melt adhesive industry, making it essential to study and research. With increasing concerns about potential hazards posed by various everyday products, along with the development of economies worldwide, the application scope of hot melt adhesive products is expanding. Especially in Europe, the United States, and Asian countries like Japan and South Korea, solvent-based adhesive products are increasingly being replaced by hot melt adhesive products.

There are various types of hot melt adhesives, but their overall formulations typically consist of basic resins, tackifiers, viscosity modifiers, and antioxidants. The main types include polyolefin-based hot melt adhesives, ethylene-vinyl acetate (EVA) hot melt adhesives, polyester-based hot melt adhesives, environmentally friendly hot melt adhesives, pressure-sensitive hot melt adhesives, and water-based hot melt adhesives.

Among these, EVA-based hot melt adhesives, environmentally friendly hot melt adhesives (used for wood and paper composite), pressure-sensitive hot melt adhesives, and water-based hot melt adhesives often utilize various types of rosin resins as tackifiers. The properties and costs of hot melt adhesives are adjusted by selecting different types of rosin resins, varying proportions, and compounding with different tackifying resins.

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