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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

Active Publication Date: 2022-01-07
RENOLIT HENGXUN PACKAGING TECH BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The PE material zipper can be waterproof, but it cannot be welded with the PP bag body;
[0005] 2) The PE zipper material can be welded with the PP bag after modification, but the smell produced by the PE material after irradiation cannot be avoided, and it cannot withstand high-temperature cooking, and it will be deformed after cooking;
[0006] 3) The transparency of the PE zipper material is poor, which cannot meet the requirements for the appearance of products with transparency requirements;
[0007] 4) PP material zippers can only be used for the packaging of some solid products due to their high hardness and insufficient elasticity;
[0009] 6) The PP zipper material has a large shrinkage rate, and the zipper skeleton is prone to shrinkage pits and is not full;
[0010] 7) PP zippers are usually prone to stretching due to the high heat-sealing temperature, and it is difficult to maintain the flatness of the heat-sealing part after sealing with the PP bag body, and the part sealed with the bag body is also prone to local delamination;
[0011] 8) PP zipper material is brittle, easy to break when bent, not resistant to low temperature, and cannot be frozen

Method used

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  • Polypropylene zipper for liquid packaging and preparation method thereof
  • Polypropylene zipper for liquid packaging and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a polypropylene zipper for liquid packaging and a preparation method thereof. The polypropylene zipper is obtained by putting a polypropylene zipper material into a feeding cylinder of a high-speed zipper extruder, melting at high temperature, extruding through a mouth mold, and cooling and shaping. The polypropylene zipper material is prepared from the following components in parts by weight: 50 to 70 parts of polypropylene I, 30 to 50 parts of toughening elastomer, 2 to 10 parts of nucleating smooth master batch, 0.05 to 0.1 part of antioxidant and 0 to 0.1 part of composite light stabilizer, wherein the total amount of the polypropylene I and the toughening elastomer is 100 parts; and the nucleating smooth master batch comprises polypropylene II, inorganic silicon dioxide, a nucleating agent and a slipping agent. The waterproof effect of the PP zipper is achieved, the performance that PP is prone to embrittlement, not resistant to low-temperature freezing and resistant to high-temperature steaming and boiling is improved, and about 50% of production energy consumption of the zipper is reduced.

Description

technical field [0001] The invention relates to the field of zipper composite bags, in particular to a polypropylene zipper for liquid packaging and a preparation method thereof. Background technique [0002] The zipper composite bag is a product with a tight seal to prevent air from continuously entering the inner bag, and is easy and convenient to operate. The zipper materials used in commercial zipper composite bags are generally polyethylene, polypropylene and EVA (ethylene-vinyl acetate copolymer). Welding process is generally adopted, considering the welding performance of different materials, it is necessary to select the corresponding zipper material for matching according to the material of the composite bag. As for liquid packaging, because PE zipper and film have good thermal sealing property and softness, liquid sealing can already be realized through technical means, see patent application CN109575407A "a film zipper production formula and process". However, P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L53/02C08L53/00C08K13/02C08K5/20C08K3/36C08K5/527C08K5/3435
CPCC08L23/14C08L2201/08C08L2205/24C08L53/025C08L53/00C08K13/02C08K5/20C08K3/36C08K5/527C08K5/3435
Inventor 王璧王婧杨萌萌许贺张丽芹杨德庆
Owner RENOLIT HENGXUN PACKAGING TECH BEIJING CO LTD
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