A kind of nano-silver inorganic antibacterial master batch for highly transparent polyolefin plastics and its preparation method and its application

Abstract

The invention relates to a nano-silver inorganic antibacterial master batch for high-transparency polyolefin plastics, its preparation method and its use. The method includes dissolving silver salt and volatile solvent into a transparent and homogeneous solution in a reaction kettle with a reflux device; then putting it into a high-speed mixer together with a dispersing reducing agent, a dispersing agent and a polyolefin carrier resin and stirring it uniformly After that, 90% of the solvent is evaporated; finally, the mixed material is added to a high aspect ratio twin-screw extruder equipped with a powerful devolatilization device, and melt-extruded and granulated at 150-240° C. to obtain the antibacterial masterbatch. The antibacterial masterbatch prepared by the invention has excellent antibacterial performance, outstanding transparency and safety performance, low production cost, and can be widely used in food and medical fields, such as high transparent antibacterial baby bottles, fresh-keeping boxes, infusion tubes and the like.

Description

technical field [0001] The invention relates to the technical field of plastics. More specifically, the present invention relates to a nano-silver inorganic antibacterial masterbatch for highly transparent polyolefin plastics, a preparation method of the nano-silver inorganic antibacterial masterbatch, and an application of the nano-silver inorganic antibacterial masterbatch. Background technique [0002] Transparent plastics such as EVA, PE, PP, PVC, PS, AS, etc. have been favored by the market since they were applied to the field of packaging materials due to their excellent transparency, mechanical properties, and easy formability. For example, PE is used in transparent fresh-keeping film for fruits and vegetables; PP is used in high-transparency baby feeding bottles, fresh-keeping boxes, etc.; BOPS film and sheet are widely used in food packaging such as sweet bread, candied fruit, fruits, vegetables, and meat; AS is used in refrigerators , Soymilk machine transparent c...

AI Technical Summary

Problems solved by technology

There is a big problem in the crushing of the material in the preparation stage of the composition of the masterbatch preparation method. After melting, it will form large pieces when cooled. The polymer materials themselves, such as polyethylene, polypropylene, PVC, etc., are relatively soft materials at room temperature, so the crushing is very difficult. It is more difficult, unless a large amount of inorganic powder fillers or ultra-low temperature freezing treatment are added, and adding a large amount of fillers to transparent resin materials will inevitably affect the transparency of the material, so this preparation process is not suitable for the preparation of highly transparent antibacterial polyolefin materials

[0009] CN 102453273A discloses an antibacterial masterbatch based on guanidinium salt polymer and its preparation method. It uses an organic guanidine salt antibacterial agent, which has good compatibility with resin and good material transparency. However, due to migration, precipitation and Greater toxicity limits its application in food and medical fields

[0010] Both CN 102140199A and CA102219956A disclose a method for preparing polypropylene antibacterial masterbatch by dispersing nano-silver powder in an organic solvent. The big problem in this type of method is that the cost of nano-silver powder is high, and the anti-agglomeration post-treatment technology of nano-silver powder It is very difficult, and in addition, organic solvents such as n-hexane and n-heptane, which are more toxic, are used in the operation, which will cause environmental pollution

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