A new large-scale method for preparing silver-containing inorganic antibacterial masterbatches for highly transparent plastics

Abstract

The invention relates to a novel large-scale method for preparing silver-containing inorganic antibacterial master batches for highly transparent plastics. This method utilizes the ultra-high temperature (260-350°C) processing technology of the plastic itself, and through the principle of chemical pyrolysis of silver salts and oxides, the silver-containing inorganic nano Preparation of antibacterial masterbatch. The silver-containing antibacterial masterbatch prepared by the invention has excellent antibacterial performance, outstanding transparency and safety performance, low production cost, is suitable for large-scale industrial production, and can be widely used in food and medical fields, such as making highly transparent antibacterial baby feeding bottles and fresh-keeping boxes , Medical surgical trays, etc.

Description

technical field [0001] The invention relates to the technical field of plastics. More specifically, the present invention relates to a method for preparing a silver-containing inorganic antibacterial masterbatch for highly transparent plastics, in particular to a preparation process of a silver-containing inorganic antibacterial masterbatch that is simple, low in production cost, and suitable for large-scale production. method. Background technique [0002] Due to the advantages of light weight, good toughness, easy molding, and low cost, plastics are increasingly used instead of glass in modern industry and daily products, especially in optical instruments and packaging industries, and the development is particularly rapid. Plastics used to replace glass are commonly called transparent plastics, among which PMMA (polymethyl methacrylate), PET (polyethylene terephthalate), PC (polycarbonate), PA (polyamide), PPSU (polyphenylene sulfone) or PES (polyether sulfone), etc. Fo...

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Problems solved by technology

[0005] According to reports, in 1983, Shinagawa Fuel Co., Ltd. of Japan launched the silver-loaded inorganic antibacterial agent for the first time in the world. It is a loaded zeolite silver-loaded antibacterial agent. 1μm, easy to turn yellow and black during long-term storage and use

[0006] U.S. Patent No. 5,094,847 discloses a preparation method of antibacterial masterbatch, which uses silver-loaded inorganic powder and organic silver compound to prepare antibacterial plastics, but the obtained plastic products must be treated by corona discharge, otherwise there is no antibacterial performance, even if the silver content The same goes for reaching 260-1000ppm

[0007] CN101392065A discloses a preparation method of inorganic antibacterial plastic film, which adopts zirconium phosphate silver-loaded antibacterial agent, the refractive index of zirconium phosphate itself and some polyolefins have a large difference, and the loaded nano-silver particles have a large size and are easy to agglomerate , can not meet the actual requirements of high transparent plastic

This method seems to be easy to operate, but the transfer control operation of nano-silver from the water phase to the oil phase is cumbersome, and the residual water in the alcohol solvent is not conducive to the dispersion of nano-silver in the plastic resin; in addition, simple mixing and drying of the materials The prepared antibacterial masterbatch may encounter problems such as pollution caused by the slow precipitation of residual solvents during storage, oxidation and discoloration of nano-silver directly exposed to the air, etc.

[0009] CN102453273A discloses a kind of antibacterial masterbatch based on guanidinium salt polymer and its preparation method. It uses organic guanidine salt antibacterial agent, which has good compatibility with resin and good material transparency. Large toxicity limits its application in food and medical fields

[0010] Both CN102140199A 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-processing technology of nano-silver powder is difficult 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

Among them, the use of organic guanidine salt and chitosan will decompose at high temperature, producing toxic and harmful gases, and nano-titanium dioxide and nano-silver oxide powder will also destroy the transparency of PC due to dispersion, agglomeration and refraction problems.

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