4results about How to "Low sealing temperature" patented technology

The invention belongs to the technical field of packaging materials, and particularly relates to an ultrathin high-speed packaging biaxially oriented polypropylene film and a preparation method thereof. The polypropylene film comprises an extrusion layer I, an extrusion layer II, a core layer, an extrusion layer III and an extrusion layer IV which are sequentially connected from outside to inside. The sealing temperature of the polypropylene film is lower than 90 DEG C, and the sealing requirement of a high-speed packaging machine can be met; the bending modulus of the film exceeds 1800 Mpa, and the high-speed film feeding requirement of a packaging machine is met; meanwhile, the advantages of low friction, high transparency, low shrinkage and the like are realized.

The invention discloses a propylene / alpha-olefin copolymer as well as a preparation method and application thereof. The weight-average molecular weight of the propylene / alpha-olefin copolymer is 100,000 to 300,000, and the melting temperature Tm of the propylene / alpha-olefin copolymer is 80 to 120 DEG C; the propylene / alpha-olefin copolymer is subjected to a rheological test by using a parallel plate rheometer in an oscillation shear mode, and an obtained fitting formula is as follows: Lg (eta *) = k * Lg omega + b. When the propylene / alpha-olefin copolymer material provided by the invention is used for a polyolefin cast film, the sealing temperature can be effectively reduced, the heat sealability is enhanced, and meanwhile, the mechanical properties of the material are not influenced.

The present application provides a propylene-based copolymer, a preparation method and application thereof, the weight average molecular weight of the propylene-based copolymer is 2.0*10 4 -40.0*10 4 g / mol, the density is 0.860-0.890 g / cm 3 -3; the gamma value of the propylene-based copolymer is greater than or equal to 80%. Through the design of specific molecular weight, density and gamma value, the regulation of material structure and composition is realized. The propylene-based copolymer is used for polyolefin film material, can effectively reduce the sealing temperature, widen the heat sealing temperature range, and make the polyolefin film containing the same have significantly improved heat sealing performance.

This invention relates to a battery sealing cap assembly and its preparation method, characterized in that: (1) glass mixture a and mixture b are melted in a high-temperature furnace to obtain glass liquid a and glass liquid b respectively; (2) glass liquid a and glass liquid b are quenched in water, dried, ground, and sieved to obtain powder a and powder b respectively; (3) powder a and powder b are mixed with water, binder and coupling agent respectively to form a slurry, granulated into balls, and sieved to obtain glass powder a and glass powder b; (4) glass powder a and glass powder b are shaped to obtain green blank a and green blank b, and after complete glue removal at room temperature to 300°C, the temperature is raised to 370 to 500°C and kept warm to form sealing glass blank I and sealing glass blank II; (5) the metal aluminum shell to be sealed, copper core column and sealing glass blank I and sealing glass blank II are assembled together to form a component to be sealed, and sealed at 490 to 540°C and annealed. Advantages of this invention: The sealing glass prepared has a coefficient of thermal expansion > 160 × 10⁻⁶ at 300°C. ‑7 / ℃, water resistance rating of level 3 or above, sealing temperature <550℃.