High-temperature-resistant composite antibacterial agent and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant composite antibacterial agent and a preparation method thereof, and belongs to the technical field of bactericides. The composite antibacterial agent comprises a guanidine salt antibacterial agent and inorganic additives, wherein the inorganic additives are selected from one or more of boric acid, boric oxide, zinc oxide, titanium dioxide, phosphoric acid, zeolite powder, silica gel powder, glass powder, talcum powder and hydroxyapatite. The preparation method comprises the following steps: adding a small number of volatile solvents into the guanidine salt antibacterial agent and the inorganic additives, mixing to be pasty, and uniformly grinding to obtain the high-temperature-resistant composite antibacterial agent; or dissolving the guanidine salt antibacterial agent and the inorganic additives into the solvents, and steaming and removing the solvents to obtain the high-temperature-resistant composite antibacterial agent. The composite antibacterial agent can integrate the immediate action, the broad spectrum and the continuity of an organic system with the safety and the heat resistance of an inorganic system. Compared with an undoped antibacterial agent, the high-temperature-resistant composite antibacterial agent has the advantage that the heat stability is obviously improved. Other accessory components can be added into the antibacterial agent according to specific application.

Description

technical field [0001] The invention relates to the technical field of bactericides, in particular to a high-temperature-resistant composite antibacterial agent and a preparation method thereof. Background technique [0002] Antibacterial materials are a new type of materials with antibacterial and bactericidal functions. They are made by adding one or several specific antibacterial agents. From the development of antibacterial materials at home and abroad, antibacterial plastics are the fastest growing and most widely used. Wide range of antibacterial materials. [0003] There are many kinds of antibacterial agents, which can be roughly divided into three categories: inorganic, organic and natural according to their chemical composition. At present, inorganic antibacterial agents are the most widely used in antibacterial plastics and the largest antibacterial agents in the market, mainly silver-based antibacterial agents. It is characterized by good safety, heat resistanc...

AI Technical Summary

Problems solved by technology

[0003] There are many kinds of antibacterial agents, which can be roughly divided into three categories: inorganic, organic and natural according to their chemical composition. At present, inorganic antibacterial agents are the most widely used in antibacterial plastics and the largest antibacterial agents in the market, mainly silver-based antibacterial agents. It is characterized by good safety, heat resistance and durability. It is currently the most widely used antibacterial agent in fiber plastics. The disadvantages are the high price and the delayed effect of antibacterial. It cannot kill bacteria quickly like organic antibacterial agents. , and has almost no inhibitory effect on fungi and molds. At the same time, the chemical properties of silver are active, and it is easy to oxidize to form dark silver oxide, thereby reducing the antibacterial effect and affecting the appearance of the product. In addition, the inorganic antibacterial powder has poor compatibility with polymers. It is easy to agglomerate in the matrix plastic, which will bring great difficulties to the processing of materials such as spinning and film drawing

However, experiments have found that the antibacterial properties of polyhexamethylene biguanide stearate, which is hydrophobic, are much worse than those of water-soluble hydrochloride propionate. In addition, polyhexamethylene biguanide stearate is added to plastics. After that, it is easy to make the color of the product yellow, which limits its application in white or transparent plastic products

[0007] Patents CN1350022A, CN1445270A, CN1569923A, US728253882 disclose a method for preparing polymers of polyamines and guanidinium salt polymers. The guanidinium salt polymer products have reactive groups that can be grafted, including double bonds, epoxy groups group, etc., and then use the melting method, solution method or solid phase method to make this guanidinium salt polymer and resin according to a higher ratio to make antibacterial masterbatches, and then use the masterbatch to prepare corresponding antibacterial plastics, which use guanidinium salt polymers To prepare antibacterial plastics, it needs to be prepared into antibacterial masterbatch first, the steps are cumbersome, resulting in higher cost, and the color of antibacterial masterbatch products is yellow, which has a certain impact on the color of the final product