Development direction of dry composite adhesives

At present, there are three major categories of adhesives commonly used in the flexible packaging industry: solvent-free adhesives, water-based adhesives, and solvent-based adhesives. Environmentally-friendly European and American developed countries use mainly solvent-free adhesives and water-based adhesives in the production of flexible packaging. Most flexible packaging companies in Asia and Africa still use solvent-based adhesives; solvent-based adhesives account for over 90% of the market share in Japan, where the flexible packaging industry is more developed. According to incomplete statistics, there are more than 6,000 flexible packaging manufacturers in China, and more than 95% of flexible packaging manufacturers use solvent-based adhesives. Less than 5% of companies use environmentally friendly adhesives.

The use of high solids and low viscosity adhesives has become an important development direction for dry composite adhesives. Previous two-component polyurethane adhesives, whose solid content of the main agent was 35% or 50%, have now been increased to 75% or 80%. 75% solids two-component polyurethane adhesives account for 60% of the market, and the market for 50% solids two-component polyurethane adhesives is shrinking to less than 30% of the market. Due to the characteristics of high solids and low viscosity, it is possible to use high solids content for high-speed composite machining.