Polypropylene zipper for liquid packaging and preparation method thereof
A technology for polypropylene and packaging, which is applied in the field of zipper composite bags. It can solve the problems of PP zipper materials such as brittleness, low temperature resistance, and non-freezing, and achieve high low-temperature impact resistance, high room temperature impact strength, and low-temperature freezing. Effect
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Embodiment 1、2
[0066] Prepare nucleating and smooth masterbatch by strand cutting, comprising the following steps;
[0067] Weigh erucamide or oleamide, inorganic silica, nucleating agent and polypropylene in proportion. Among them, the particle size of inorganic silica is about 5 μm, the nucleating agent is phosphate nucleating agent NA-21, the polypropylene is ethylene propylene binary copolymerized polypropylene, and the melting point is about 140 ° C, so as to maintain a close relationship with the substrate. melting point. The specific raw material consumption is shown in Table 1 below.
[0068] First, the polypropylene resin is ground into powder by a grinder, and then added into a high-speed mixer in the order of polypropylene, inorganic silica, nucleating agent, erucamide or oleic acid amide and mixed evenly, and then added into a twin-screw extruder The machine carries out water-cooled strand cutting, the processing temperature is 180-200°C, not exceeding 200°C, and the screw spee...
Embodiment 3-14
[0072] Prepare the polypropylene zipper material, comprising the following steps:
[0073] Add polypropylene, styrene-based elastomer, propylene-based elastomer, nucleated smooth masterbatch, antioxidant, and photosynthetic stabilizer in turn, mix in the color mixer for 3-5 minutes, mix well and add to the extruder, or Use an automatic feeding system to feed materials according to the ratio, extrude at a temperature of 160-200°C and a low torque speed of no more than 300rpm, water-cool, dry, and pelletize to obtain polypropylene zipper materials.
[0074] The formulation components and consumption are shown in Table 2 below in each embodiment. Use the polypropylene zipper materials obtained respectively in Examples 3-14 to prepare zippers: put the polypropylene zipper materials into the feeding barrel of a high-speed zipper extruder, melt at high temperature, extrude through a die, and cool naturally for 12 hours The above-mentioned polypropylene slide fastener was obtained. ...
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