Application of CPP resin in adhesive

Yellowish granular CPP resin has good resistance to aging, fire and corrosion, and is soluble in solvents such as toluene and CCl₄. When the chlorinated polypropylene solution is contacted with the polypropylene material, the surface of the polypropylene undergoes limited swelling, The intercrystalline force of the crystals of the same chemical structure is attracted to each other, thereby exhibiting the bonding ability. At this time, the polypropylene with high crystallinity is formed by the introduction of chlorine atoms to form chlorinated polypropylene, which reduces the crystallization to below 4%, and the introduction of chlorine greatly enhances the active point of chemical reaction of polypropylene, therefore, many reactions that cannot occur on polypropylene are achieved.

However, at the same time, the melting point is greatly reduced due to the decrease in crystallinity, so the mechanical strength is also lowered by the decrease in cohesive force. In order to increase its cohesion, it is necessary to modify the chlorinated polypropylene by introducing a compound having a strong polar group into the chlorinated polypropylene molecule to enhance its mechanical strength and bonding property. By reacting chlorinated polypropylene with various types of monomers containing polar groups, adhesives having different properties can be obtained.

Granular CPP resin is a very good adhesive with a strong bond. It has many different formulations, making it a wide range of applications.