2results about How to "Moderate softening point" patented technology

The invention provides a cigarette soft package hardened packaging hot melt adhesive and a preparation method thereof, the cigarette soft package hardened packaging hot melt adhesive is mainly prepared by reaction of hot melt adhesive base resin and polyurethane hot melt adhesive prepolymer, the melt viscosity of the hot melt adhesive at 150 DEG C is 500-1000 mPa.S, and the Tg is 60-80 DEG C; the hot melt adhesive is prepared from the following main raw materials in percentage by weight: 20-50% of base resin, 10-30% of polyurethane hot melt adhesive prepolymer, 30-60% of tackifying resin, 0-20% of viscosity modifier, 1-5% of compatilizer, antioxidant and base material wetting agent. The polyurethane hot melt adhesive prepolymer is mainly prepared from raw materials such as polyether polyol, polyester polyol and isocyanate according to the weight ratio of (20 to 40): (15 to 30): (15 to 30); the polyester polyol is not easy to crystallize and has low polarity. The hot melt adhesive can meet the requirements of the hot melt adhesive for hardening packaging of soft packages for cigarettes.

The present application relates to the field of pitch, and discloses a kind of impregnated pitch and its preparation method and application, which comprises: (1) oil slurry I is separated, and the intermediate distillate oil with initial boiling point 390-420 DEG C and final boiling point 450-470 DEG C is obtained;(2) in the presence of inert gas I, the intermediate distillate oil is carried out first heating reaction, and heavy distillate oil is obtained;(3) in mixed gas, the heavy distillate oil is carried out second heating reaction, and impregnated pitch is obtained;The volume ratio of inert gas II and air in the mixed gas is 1:2-5;The temperature of the second heating reaction is at least 30 DEG C lower than that of the first heating reaction;The pressure of the first heating reaction and the second heating reaction is independently 0.05-1 MPa respectively.The impregnated pitch prepared by the method of the present application has the advantages of low softening point, low quinoline insoluble content and high coking value, and can enhance the bulk density of graphite electrode when applied to graphite electrode.