Thickening resin

Technical analysis of tackifying resins

I. Main types and characteristics

Petroleum resin:

C5 petroleum resin: Made from cracked carbon five fractions, it has low chroma, high compatibility (compatible with polymers such as EVA/SBS/SEBS) and aging resistance, with a softening point range of 70-140°C, and is widely used in hot melt adhesives, pressure-sensitive adhesives and rubber tires.

C9 petroleum resin: Aromatic structure, acid and alkali resistance and better temperature resistance (softening point > 120°C), suitable for high-strength bonding scenarios such as tire tread adhesives and anti-corrosion coatings, and has good compatibility with natural rubber and synthetic rubber.

Terpene resin: Made from turpentine, it is light and transparent, resistant to yellowing, and has excellent compatibility with elastomers such as SBS/SIS, and is suitable for environmentally friendly products such as transparent tape and medical pressure-sensitive adhesives.

Phenolic resin: Tert-butylphenolic resin (204 resin): Soluble in organic solvents, significantly improves the bonding strength and process stability of styrene-butadiene rubber and chloroprene rubber, and is used in industrial fields such as tire molding and hose lamination. Thermoplastic phenolic resin (SP-1068): Specially used in tire lamination process, enhances the dynamic bonding strength of rubber-cord, and is suitable for high temperature and high pressure processing environment. Modified resin: P-580 tackifying resin: Colorless and transparent, yellowing resistance (softening point 110-130℃), enhances the cohesion and heat resistance of chloroprene adhesive, and is suitable for food packaging and medical grade adhesives. 2. Core mechanism of action Physical tackification: Filling the gaps between rubber molecules or forming a dense adhesive film to improve the mechanical bite force of the interface, such as C5 resin in hot melt adhesive to improve wettability and initial adhesion. Chemical bonding: Resin active groups (such as phenolic hydroxyl groups and anhydride) form hydrogen bonds or covalent bonds with rubber polar segments. For example, phenolic resin improves dynamic bonding strength by cross-linking phenolic hydroxyl groups with rubber.

3. Typical application scenarios

Hot melt adhesive and pressure-sensitive adhesive: C5 petroleum resin (such as Daqing Huake HK51) provides high peel strength and fast adhesion in EVA/SBS hot melt adhesive, suitable for label and sanitary product production.

Tire manufacturing: C9 petroleum resin is compounded with SP-1068 phenolic resin to enhance the wear resistance of tread rubber and the bonding strength of rubber-cord interface, and reduce the risk of high-temperature delamination.

Industrial adhesive: P-580 resin is used in chloroprene adhesive to improve hydrolysis resistance and stability, and is suitable for automotive sealing strips and building structure bonding.

Comparison Table of Core Parameters of Thickening Resin：