Super-hydrophobic antifogging masterbatches for film and preparation of super-hydrophobic antifogging masterbatches

Abstract

The invention relates to superhydrophobic antifogging masterbatches for a polypropylene film and a preparation method of the superhydrophobic antifogging masterbatches. The method mainly comprises thefollowing steps: (1) preparing grafted polypropylene PP-g-GMA by adopting a melt grafting method; (2) copolymerizing ethylaminosiloxane with methylhydrosiloxane; (3) reacting the ethylaminosiloxane / methylhydrosiloxane copolymer obtained in the step (2) with perfluorooctylethylene to obtain fluorosilicone resin with amino; and (4) carrying out reactive extrusion on the fluorosilicone resin with the amino obtained in the step (3), the grafted polypropylene PP-g-GMA obtained in the step (1) and polypropylene, and reacting the amino on the fluorosilicone resin with the amino and an epoxy group onthe side chain of the grafted polypropylene PP-g-GMA to prepare the superhydrophobic antifogging masterbatches. According to the invention, the hydrophobic antifogging masterbatches are added to an antifogging surface layer of the film to prepare the antifogging film in a mixing manner, so that the antifogging film has the advantages of easiness in processing, low cost, good antifogging effect, permanent antifogging, no influence on the optical performance of the film, improvement of the weather resistance of the polyolefin film and the like. The method can be applied to freshness retaining of vegetables.

Description

technical field [0001] The invention relates to the field of superhydrophobic antifog masterbatch, in particular to a superhydrophobic antifog masterbatch for thin films and its preparation. Background technique [0002] Anti-fog film is mainly used in the fields of agricultural film and food packaging. For example, anti-fog agricultural film can prevent fog droplets from reducing the light transmittance of the greenhouse and directly affect the growth of crops. Fog droplets falling on crops will also cause stems and leaves to rot . At present, anti-fog films are mainly biaxially oriented polypropylene film (BOPP), cast polypropylene film (CPP), and cast polyethylene film (CPE). Both polyethylene and polypropylene are non-polar polymers with poor hydrophilicity. The surface tension of both is very low, only 31mN / m, while the surface tension of water is 72mN / m. The contact angle is 90-92°, which cannot play an anti-fog effect. [0003] At present, the anti-fog film mainly ...

AI Technical Summary

Problems solved by technology

[0007] The main disadvantage of the external coating method is that it needs to add coating facilities, and there are problems such as solvent volatilization, recycling, and environmental protection, and the anti-fog effect is often affected by the weak coating

The main disadvantage of the internal addition method is that the anti-fog agent used is a hydrophilic small molecule, and the anti-fog effect is achieved by the migration of the small molecule to the surface of the film, and the anti-fog effect is related to the migration amount of the small molecule

Since the small molecules of the anti-fogging agent can dissolve in water, the anti-fogging agent in the film will gradually lose due to constant contact with water, and the anti-fogging effect will gradually weaken

Moreover, since the migration of small molecules of anti-fogging agents is affected by temperature, when the temperature is too low and the migration of small molecules is too small, the anti-fogging effect will be too poor, and if the temperature is too high, more anti-fogging agents will be lost.

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