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Factors Affecting the Performance of Petroleum Resin

author£ºadmin Date£º2016/12/29 17:39:22

Different types of petroleum resin, because of its large differences in molecular structure, only with the corresponding elastomer compatibility has a good viscosity. In general, the cationic catalytic polymerization or thermal polymerization of the C9 petroleum resin from the softening point of high polarity. And poor compatibility with elastomers such as natural rubber and styrene-isoprene-styrene block copolymer (SIS) containing a conjugated diene structure. These adhesives are not suitable as tackifiers for rubber-based adhesives, but have good compatibility with styrene-butadiene-styrene block copolymer (SBS) and styrene-butadiene rubber (SBR) a tackifier for such elastomers. From the elastomer and petroleum resin generally compatible range of view, with SBS and SBR as the elastic, preferably C9 petroleum resin, C5-C9 copolymer petroleum resin as tackifier; SIS as elastomer, preferably C5 Petroleum resin, C5-C9 copolymer resin as tackifier.

The softening point of the petroleum resin is generally determined by the relative molecular weight of the resin and the structure of the resin, and is about 40¡æ to 50¡æ higher than the glass transition temperature Tg. The higher the relative molecular mass, the higher the specific gravity of the ring structure, the higher the softening point of petroleum resin.

The softening point of petroleum resin has a great influence on the holding strength of hot melt adhesive. The higher the softening point of the resin, the stronger the cohesive strength of the resin, the higher the sticking strength of the adhesive, and the higher the application temperature of the hot-melt adhesive, the wider the application range; therefore, the softening point as high as possible, but too high softening point may increase the melt viscosity of the resin, reducing the infiltration of hot-melt adhesives, but not conducive to hot-melt adhesives. If the melting temperature of hot-melt adhesives by reducing the method of reducing the melt viscosity, likely to cause too high due to the sizing temperature of the matrix resin thermal degradation, reducing the service life of hot-melt adhesives, petroleum resin softening point is generally 80 ~ 130 ¡æ between the more appropriate. In addition, the softening point of petroleum resin on the hot melt adhesive curing speed, hot melt adhesive sizing speed also has a great impact. Softening point is too high also easily lead to hot-melt adhesive hardening and crust.

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