Modified polypropylene zipper material for liquid packaging and preparation method thereof

Abstract

The invention discloses a modified polypropylene zipper material for liquid packaging and a preparation method thereof. The formula comprises the following components in parts by weight: 50-70 parts of polypropylene I, 30-50 parts of a toughening elastomer, 2-10 parts of nucleating smooth master batch, 0.05-0.1 part of an antioxidant and 0-0.1 part of a composite light stabilizer, wherein the total amount of the polypropylene I and the toughening elastomer is 100 parts by weight; the nucleating smooth master batch is prepared from polypropylene II, inorganic silicon dioxide, a nucleating agent and a slipping agent, and the mass ratio of the polypropylene II to the inorganic silicon dioxide to the nucleating agent to the slipping agent is (85-90): 5: (2.5-5): (2.5-5). According to the modified polypropylene zipper material, the waterproof effect of a 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 the production energy consumption of the zipper is reduced by about 50%.

Description

technical field [0001] The invention relates to the field of zipper composite bags, in particular to a modified polypropylene zipper material 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 pro...

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

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