Fluorine-containing antifogging agent, preparation method and application thereof

Abstract

A fluorine-containing antifogging agent, a preparation method and an application thereof. The fluorine-containing antifogging agent is composed of a polyether glycol, a fluorine-containing alcohol and diisocyanate, wherein the total molar ratio of hydroxyl groups to isocyanate groups in the antifogging agent is 1-2:1 and the molar ratio of the fluorine-containing alcohol to the polyether glycol is 1:1-5. The preparation method includes the steps of mixing the fluorine-containing alcohol with the polyether glycol, dehydrating the mixture and adding polyisocyanate to carry out a reaction to obtain the fluorine-containing antifogging agent when the reaction is finished after the isocyanate group eliminated. The fluorine-containing antifogging agent is safe to human and other animals, is free of chemical accumulation, is convenient to prepare and is environmental-protective. The fluorine-containing antifogging agent, when being used in plastic package and agricultural greenhouse films, can effectively solves a problem of damage on growth of crops and storage of foods due to fog drops generated from condensation of steam.

Description

technical field [0001] The invention relates to a fluorine-containing antifogging agent, a preparation method and application thereof. Background technique [0002] At present, the vegetable greenhouse films used in my country mainly include PVC non-drip film and PE non-drip film. The functional additives of these two films are ordinary non-drip agents with polyol ester surfactants as the main components. Due to the low efficiency of polyol ester surfactants, they are affected by gravity and the Marangoni effect at the same time. In the actual use process, especially in winter, when the shed is closed, heavy fog will be generated in the shed, which will hinder the transmission of light, reduce the intensity of light, and affect the increase of the temperature and low temperature in the shed, which is not conducive to the indoor temperature of the shed. Moreover, mist can easily spread various diseases, reduce the yield of crops in the shed, and affect the quality of agricul...

AI Technical Summary

Problems solved by technology

The existing synthetic method of fluorine-containing surfactant generally adopts electrolytic fluorination method, because this reaction is very intense, and C-C chain breakage is prone to occur. Short-chain perfluorinated compounds and other types of by-products, so the overall product yield is low, resulting in high cost and pollution

[0005] The main component of the fluorine-containing surfactant commonly used in anti-fogging agents on agricultural film materials is perfluorooctanoic acid (PFOA). Although it has excellent surface activity and anti-fog function, it is one of the most difficult to degrade organic pollutants known at present, and its properties are stable. , has high bioaccumulation, "Research Progress on the Bioaccumulation Effect of Perfluorinated Compounds" ([Journal of Ecological Environment], 2010, 9 (5): 1246-1252) shows that PFOA will not only make the human respiratory system, Problems with the immune system can also cause tumors and cause weight loss in experimental animals

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