The softening point of petroleum resin is generally 80-140 ℃, the relative density is 0.970-0.975, the relative molecular weight is less than 2×103, insoluble in water, soluble in organic solvents, low acid value, good adhesion, water resistance and resistance. chemical properties, and is characterized by good viscosity regulation and thermal stability.

Therefore, petroleum resins can completely replace rosin resins and terpene resins as tackifiers for hot melt adhesives and pressure-sensitive adhesives, which can improve wettability and adhesion. The performance of rosin resin modified hot melt adhesive can be achieved by using petroleum resin with a mass fraction of 60%.

Performance index of petroleum resin for hot melt adhesive

When formulating hot melt adhesives and pressure sensitive adhesives, the matrix resin only has cohesion when it melts at a certain temperature. Once the temperature drops, the cohesion will decrease or even lose the cohesive ability. Adding petroleum resin to the elastomer can not only improve the viscosity and wettability of the hot melt adhesive, but also improve the surface contact effect and characteristic bonding performance, and achieve an ideal balance between viscosity, cohesive strength and interfacial strength;

It is also possible to expand the use environment of hot melt adhesives by adjusting the rheology of the adhesive, increasing the glass transition temperature of the mixture, and adjusting the heat resistance temperature of the hot melt adhesive.

As an amorphous petroleum resin with complex composition composed of monoolefin and diolefin polymerization, it has no fixed melting point, and the ring and ball softening point of the resin becomes an important factor determining the performance of the resin.

Other physical properties of petroleum resin such as color, compatibility, melt viscosity, acid value and iodine value are also important factors in determining the application field of petroleum resin.