Two-way stretch polypropylene film with functions of antibiosis and mildew resistance and preparation method thereof

Abstract

The invention discloses a two-way stretch polypropylene film with functions of antibiosis and mildew resistance and a preparation method, the polypropylene film comprises the following mixed components: 100 parts of polypropylene resin, 0.1-3 parts of anti mildew agent; an anti mildew agent is poly-guanidine pyrithione acid salt which is prepared by mixing poly-guanidine inorganic acid salt or an organic acid salt aqueous solution and a sodium pyrithione aqueous solution, wherein the mol ratio of guanidyl in the poly-guanidine to pyrithione acid salt is 1:(0.1-5); the polypropylene resin is specially used for BOPP. The method comprises the following steps: mixing or performing a melt blending to the components according to the proportion, casting into sheets, and then performing a two-way stretch to the polypropylene film with functions of antibiosis and mildew resistance. According to the invention, the BOPP film prepared by the invention has good effects of antibiosis and mildew resistance, and the components of antibiosis and mildew resistance is difficult to precipitate from the film, the invention has the advantages of good water resistance and stability as well as high transparency, so that the two-way stretch polypropylene film can be widely used.

Description

technical field [0001] The invention relates to the field of plastics, in particular to an antibacterial and antifungal polypropylene biaxially stretched film and a preparation method thereof. Background technique [0002] Polypropylene (PP) has the advantages of good mechanical properties, non-toxicity, heat resistance, chemical corrosion resistance, easy processing and low cost, etc., and has been more and more widely used in many fields. With the rapid development of the packaging industry, biaxially oriented polypropylene film (BOPP for short) has been widely used in the packaging of food, candy, fruit, etc. The rich nutrients in food can easily lead to the growth of microorganisms, resulting in food corruption, resulting in Waste, also can bring harm to health after people eat at the same time; In addition, along with the strengthening of people's hygiene consciousness, and the popular of multiple infectious diseases in recent years, to the articles for use in some publ...

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Problems solved by technology

[0003] Chinese patent CN 2789254Y proposes a method for preparing an antibacterial BOPP film, which uses a polyamine and guanidinium polymer masterbatch, or uses a silver-containing composite masterbatch. The patent does not mention the use of Whether the polyamine and guanidinium salt polymer masterbatch is self-made or commercially available, but the guanidinium salt polymer is first made into a masterbatch and then made into a BOPP film. The steps are cumbersome and increase the cost. In addition, the silver-based antibacterial agent used in this patent The problem of yellowing will appear after long-term light or aging, and the patented BOPP film does not mention that it has anti-mildew properties

If polyguanidine is simply added to BOPP, there is still the disadvantage that polyguanidine is easy to precipitate in the BOPP film, especially in some applications with high humidity, which will reduce the antibacterial timeliness of antibacterial BOPP

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