Leather glue, as a key medium for connecting leather with other materials, has a development history almost as long as the history of human use of leather. As early as ancient times, people extracted collagen from animal skins, bones, and tendons to make natural animal glue, which was used to bond wood and leather. This ancient wisdom demonstrates the unique charm of natural materials in the field of bonding. However, with the rise of modern industry and higher requirements for adhesive strength, weather resistance, and production efficiency, leather adhesives have ushered in the era of synthetic materials.

Nowadays, polymer materials such as polyurethane and water-based acrylic ester have become mainstream. They not only inherit the flexibility of natural rubber, but also achieve a qualitative leap in water resistance, acid and alkali resistance, and fatigue resistance.

The core characteristic of modern leather glue lies in its excellent "flexibility and synchronicity". Leather itself is a natural or synthetic material with elasticity and ductility, which undergoes deformation when subjected to force. If the adhesive layer is too hard, stress concentration will occur at the bending point, leading to wrinkling or even cracking and delamination. Therefore, high-quality leather glue must maintain a soft and elastic film after curing, which can perfectly synchronize with the deformation of the leather, truly achieving the goal of "leather moving, glue moving, deformation not separated".

In addition, leather adhesive also needs to have strong adhesion and permeability, which can penetrate deep into the interior of leather fibers or form a dense chemical bonding layer with them, thereby providing a durable and strong bonding effect in complex surfaces, folds, and other areas, without damaging the original texture and luster of the leather.

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