Antibacterial master batch based on guanidinium polymer and preparation method thereof

Abstract

The invention provides an antibacterial master batch based on a guanidinium polymer and a preparation method thereof. The antibacterial master batch comprises the following blended components: a matrix resin, a composite antibacterial agent and a dispersant, wherein, on the basis of 100 parts by weight of the matrix resin, the composite antibacterial agent is 10 to 30 parts by weight, the dispersant is 2 to 10 parts by weight, the matrix resin is at least one selected from the group consisting of low-density polyethylene and high-melt index polypropylene, and the composite antibacterial agentis a polyguanidine / polysilicate composite antibacterial agent and is prepared by mixing an aqueous solution of water-soluble polyguanidine inorganic acid salt or organic acid salt with an aqueous solution of water-soluble silicate and adding an aqueous solution of water-soluble metal salt. The antibacterial master batch is used for antimicrobial modification of polypropylene, and addition amount of the antibacterial master batch is 2 to 10 wt % of the matrix material polypropylene; prepared modified polypropylene has the advantages of high antibacterial efficiency, a white color, good washingfastness, etc.

Description

technical field [0001] The invention relates to a masterbatch used for an antibacterial composition, and furthermore, to an antibacterial masterbatch used for antibacterial modification of polypropylene and a preparation method thereof. Background technique [0002] With the improvement of people's living standards and the increasing awareness of health and hygiene, antibacterial requirements have been put forward for many plastic products. As one of the largest varieties of general-purpose plastics, polypropylene is widely used in the preparation of daily necessities. Therefore, the antibacterial modification of polypropylene has always been a hot spot in the field of antibacterial research. [0003] During the processing of polypropylene products, such as injection molding, blow molding, extrusion, etc., adding a certain amount of antibacterial masterbatch can endow the final polypropylene products with antibacterial function. Due to the advantages of flexible application...

AI Technical Summary

Problems solved by technology

However, due to its high hygroscopicity and the generally low melting point of guanidinium salt polymers, usually lower than 120°C, the following problems are prone to occur when preparing masterbatches: (1) The guanidinium salt polymers are easy to dissolve in the mixer during the mixing stage. It is not easy to mix evenly with the matrix resin, dispersant or other components, and it is difficult to clean up after the wall is attached; (2) In the granulation stage, due to the low melting point of the guanidine-based polymer, it is easy to absorb moisture. It is very easy to block the feeding section of the screw, resulting in no feeding and no granulation, and the guanidinium salt polymer is also easy to stick to the wall of the feeding funnel, which is difficult to clean and causes inaccurate metering; (3) in the final In plastic products, because the general guanidinium salt polymer still has a certain degree of moisture absorption, if it is often soaked in water or in contact with water, it will gradually precipitate out of the plastic after a long time, and the antibacterial efficiency will decrease or even disappear.

However, the preparation steps of the special structure guanidinium salt polymer used in this antibacterial masterbatch are relatively cumbersome, involving the use of more organic solvents, styrene monomers, peroxides, etc., and the color of the antibacterial masterbatch product is yellower. , has a certain influence on the color of the final product

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