An antibacterial polycarbonate composite material and a preparing method thereof

Abstract

An antibacterial polycarbonate composite material is disclosed. The composite material includes, by weight, 100 parts of polycarbonate, 0.01-5 parts of a nanometer metal oxide, and 0.01-5 parts of a silicon-containing polymer, with content of silver ions based on the total weight of the composite material being 100-1200 ppm. The nanometer oxide and the silicon-containing polymer are synergistic toachieve dispersion and migration effects so that the silver ion concentration increases in a gradient manner from inside to the surface of the material, and along with abrasion of the material surface, the silver ions inside the material migrate to the surface along with the silicon-containing polymer at a uniform speed so that the material maintains good continuous antibacterial effects, and therefore, the dosage of the silver ions can be reduced, and the composite material has good appearance, good color stability, good antibacterial performance, and other advantages.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to an antibacterial polycarbonate composite material and a preparation method thereof. Background technique [0002] At present, polycarbonate (PC) is widely used in the production of various industrial and civil parts (such as various transparent parts, lampshades, instrument panels, etc.). With the improvement of living standards, people pay more and more attention to health. In order to avoid the reproduction of bacteria in plastic parts and improve the safety of products, the requirements for plastics to inhibit the reproduction of bacteria are becoming increasingly stringent. [0003] At present, the most antibacterial agents used in modified plastics are metal ion antibacterial agents. Due to their instability, these metal ions are easily oxidized during processing or even during use, which not only loses the bactericidal function but also makes the materia...

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Problems solved by technology

[0003] At present, the most antibacterial agents used in modified plastics are metal ion antibacterial agents. Due to their instability, these metal ions are easily oxidized during processing or even during use, which not only loses the bactericidal function but also makes the material color darken

Especially in engineering plastics, such as polycarbonate resin, the processing temperature is often higher than 300 ° C, so how to make the antibacterial agent stable and maintain the effect in the higher processing technology is more difficult, the existing technology can be increased by The amount of toner is used for appearance modification, but increasing the amount of toner will greatly increase the cost of materials and will directly affect the heat resistance of polycarbonate materials

Chinese patent 201610555237.5 discloses a yellow-resistant nano-silver antibacterial polycarbonate material. This patent uses a metal ion passivator to prevent the material from turning yellow at high temperature during processing, but it does not consider the dispersion of silver ions in the material.

[0004] At the same time, the melted polycarbonate has a high viscosity during processing, and the polycarbonate material is a temperature-sensitive material rather than a shear-sensitive material. Therefore, the metal ion antibacterial agent of the filler type is easy to aggregate. How to ensure that the addition amount is small? It can also ensure that the antibacterial agent forms an obvious gradient concentration difference in the matrix and disperses on the surface of the entire material to achieve a bactericidal effect, which is a technical problem to be solved urgently

Moreover, the existing technology can only enrich the silver ion antibacterial agent on the surface of the material or evenly disperse it in the material. The former is easy to wear and lose antibacterial properties due to the surface of the material, and the latter is because the silver ion antibacterial agent is evenly distributed in the material. , there is very little silver ion antibacterial agent distributed on the surface, so the antibacterial effect is not good. The solution is generally to increase the amount of silver ion antibacterial agent and increase the cost

On the other hand, after the silver ion antibacterial agent on the surface of the material is worn away, the silver ion antibacterial agent present inside the material cannot migrate to the surface, so the durability of the material is poor

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