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The impact of melt viscosity, thermal stability on petroleum resin

author£ºadmin Date£º2016/12/30 17:48:44

The melting viscosity of petroleum resin is often determined by the relative molecular weight of the resin, relative molecular mass distribution and structural characteristics of the decision. When processed at high shear rates, polymers with narrow monodisperse or relative molecular mass distribution have higher viscosities than homogeneous polymers with broad distribution; under the same injection and extrusion processing conditions. The broad relative molecular mass distribution is better than the narrow distribution sample fluidity.

Low melt viscosity hot melt adhesive can be better in the substrate on the spread, increasing the hot melt adhesive and the substrate between the contact area and improve the hot melt adhesive to the extent of the infiltration of the adhesive. But the melt viscosity is too low, on the one hand may cause the hot melt adhesive system caused by the settlement of the material composition of the uneven distribution of materials, on the other hand may cause hot-melt adhesives and adhesives will be the interface between the increase; The cohesive strength of the gel is reduced but not conducive to adhesion. The melt viscosity of the petroleum resin is preferably 150 to 250 mPas.

At present, the world's petroleum resin is toward specialization, multi-purpose and electron beam curing direction. Due to historical conditions and other reasons, China has long been tackifying resin rosin resin and terpene resin-based, while the slow development of petroleum resins, compatibility, softening point and other major quality indicators and similar foreign products there is a big gap , High softening point, low color weather resistance resin, copolymer resin, modified DCPD resin, colorless hydrogenated petroleum resin has been relying on imports.

In the modification of C5 petroleum resin, efforts should be made to develop new modifiers to produce C5 petroleum resin with lower color, higher softening point and wider application scope; to increase the degree of distillation of C9 fractions, to improve C9 petroleum resin color, quality and cheap C9 and C5-C9 petroleum resin, to meet our hot-melt adhesives, pressure-sensitive adhesive with the growing needs of petroleum resins.