Environment-friendly flame-retardant polyvinyl alcohol film and preparation method thereof

Through the combination of chitosan/phytic acid/boron nitride composite flame retardant and polydopamine modified cellulose nanocrystals, the problems of flammability and insufficient toughness of polyvinyl alcohol films are solved, and efficient flame retardant and mechanical properties are achieved, while maintaining light transmittance and environmental protection.

CN120484415APending Publication Date: 2025-08-15ANHUI RUIHONG NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202510802600.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-16
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

Polyvinyl alcohol films are flammable and produce black smoke and melt droplets when burned. They are not tough enough and are prone to expand and dissolve in humid environments. The existing flame retardants have problems such as poor compatibility and degradation of mechanical properties.

Method used

Chitosan/phytic acid/boron nitride composite flame retardant and polydopamine modified cellulose nanocrystals are used to improve flame retardant performance through electrostatic interaction and interface compatibility, form an expanded carbon layer and thermal stability, and enhance mechanical properties.

Benefits of technology

The flame retardant properties and mechanical properties of polyvinyl alcohol films are improved, while maintaining good light transmittance and biodegradability, avoiding the side effects of traditional flame retardants.

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Abstract

The invention discloses an environment-friendly flame-retardant polyvinyl alcohol film and a preparation method thereof, and relates to the technical field of polyvinyl alcohol films. The polyvinyl alcohol film is prepared from the following components in parts by weight: 90 to 110 parts of polyvinyl alcohol, 0.4 to 1.2 parts of polydopamine modified cellulose nanocrystals, 8 to 15 parts of chitosan / phytic acid / boron nitride composite flame retardant and 0.6 to 0.9 part of plasticizer. The preparation method comprises the following steps: adding polyvinyl alcohol into deionized water, dissolving and mixing to obtain a polyvinyl alcohol aqueous solution, adding glycerol, continuously stirring for 1-2 hours, sequentially adding a chitosan / phytic acid / boron nitride composite flame retardant and polydopamine modified cellulose nanocrystals, and uniformly stirring and mixing at 50-70 DEG C to obtain a blended solution; and carrying out film casting on the blended solution. The limit oxygen index of the film is greater than or equal to 30%, the vertical combustion grade is V-0, the tensile strength is greater than or equal to 40%, the elongation at break is greater than or equal to 140%, and the light transmittance is greater than or equal to 85%.
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