As the demand for eco-friendly adhesives increases in various industries due to the improvement of quality of life, interest in solvent-free hot melt adhesives is gradually increasing. Hot melt adhesive is an adhesive that is applied in a molten state after heating to a solid at room temperature. It has excellent workability and processability. As an environmentally friendly product, it can improve process efficiency by applying it to automation such as roll coating / spray coating.
Reactive Hotmelt
Reactive hot melt adhesives are heated before processing and applied in molten state. When the adhesive cools down, it builds up its green strength through a physical hardening process. Water molecules (from the substrate or the air) then trigger a chemical reaction which transforms the adhesive into an elastomer. After complete crosslinking, reactive hot melt adhesives provide a stronger bond with a superior resistance against moisture, heat and chemicals.The reactive groups in the adhesive will also form strong (covalent) chemical bonds with suitable reactive partners on the surface of the substrate, which significantly expands the range of adhesion.
EVA Hotmelt
EVA hot melt adhesive is a hot melt adhesive in which EVA is the main component and a tackifying resin and wax are blended. It is an adhesive that can be applied to a wide range of uses depending on the physical properties of its main component, EVA. It has excellent elasticity, flexibility even at low temperatures, and is widely used in the fields of packaging, bookbinding, plywood woodworking, shoe insole adhesion, etc.
Amorphous Poly-Alpha-Olefin Hotmelt
Amorphous Poly-Alpha-Olefin (APAO / APO) bulk hot melt is a non-crystalline adhesive that is soft, tacky and flexible. APAO hot melt adhesives have better adhesion in low temperatures than EVA and provide high heat resistance. They are available in a broad range of viscosities and are non-polar meaning they are resistant to high and low pH chemicals and many solvents. With excellent bonding capabilities to low energy substrates, APO type adhesives are excellent for difficult to bond materials and are often used for product assembly applications.
Polyamide Hotmelt
Polyamide hot melts are mainly synthesized by the reaction of diacid and diamine. Since dicacid hydrocarbons are involved in adhesion to non-polar substrates, and polar amide groups and terminal amine acids induce adhesion to polar surfaces, adhesion to a wide range of materials is possible. They have high thermal stability, high melting points, and good chemical resistance to many compounds including many common solvents, plasticizer, and oils. Compared to other hot melts, such as EVA and polyolefins, they offer higher creep resistance under load and better flame retardancy and heat stability. Polyamides have high cohesive strength due to the presence of strong inter-chain hydrogen bonds, which is the reason for the relative high strength, high melting point and good temperature and chemical resistance.
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