This technology features a boric acid-PVA film matrix, its manufacturing method, and a barrier film for packaging, created by crosslinking boric acid and polyvinyl alcohol within a polyvinyl alcohol matrix using hydrochloric acid as an acid catalyst.
While PVA offers biodegradability and high oxygen barrier properties, its use in packaging has been limited by poor water resistance, high water vapor permeability, and inferior thermal characteristics. Previous crosslinking agents like diisocyanate and glyoxal were unsuitable for eco-friendly packaging due to their volatility and toxicity.
This technology uses 0.1–10 parts by weight of boric acid and 0.35–0.87 parts by weight of hydrochloric acid per 100 parts by weight of PVA to induce eco-friendly crosslinking. This enhances water resistance and thermal stability while maintaining PVA's inherent gas barrier properties and non-toxicity. The film is produced through a simple solution casting process followed by curing at 50–70°C. It is ideal for food packaging, paper coating barrier layers, and biodegradable materials, enabling the production of moisture-resistant barrier films without toxic crosslinkers.
This invention was developed with support from the Ministry of Land, Infrastructure and Transport for the development of fresh logistics packaging technology and systems to ensure the safety of temperature-sensitive cargo and reduce household waste.
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