3results about How to "Low gas permeability" patented technology

This application relates to the field of rubber materials technology, and discloses a hybrid particle, its preparation method and application, and a low-gas-permeability rubber composite material. The general chemical structural formula of the hybrid particle is: M n+ ( ‑ OOC) n -RM n+ It is a coordinating metal cation, ( ‑ OOC) n -R represents the carboxylate ion. This application describes the preparation of novel hybrid particles by organic carboxylic acids and inorganic metal ions through organic-inorganic coordination hybridization. Benefiting from the partially organic properties and low surface polarity of these hybrid particles, they exhibit excellent compatibility with the rubber matrix. When introduced into rubber, they can disperse well in the rubber matrix and form excellent interfacial bonds without additional modification. This significantly extends the gas permeation path in the rubber network and effectively reduces gas escape at weak interfaces, thereby greatly improving the gas barrier properties of the rubber material and reducing gas permeation.

The application provides a nanocellulose-based edible preservative liquid, a preparation method and a use method thereof. The nanocellulose-based edible preservative liquid comprises a nanocellulose solution, beeswax and glycerol. The preparation method comprises the following steps: mixing the nanocellulose solution, the beeswax and the glycerol according to a proportion and heating to melt the beeswax to obtain a mixed liquid; then, stirring and emulsifying the mixed liquid to obtain a nanocellulose emulsion; finally, performing vacuum defoaming treatment on the nanocellulose emulsion to obtain the nanocellulose-based edible preservative liquid. The application develops an edible and easy-to-wash preservative liquid based on nanocellulose, adopts a dipping coating mode to perform coating film treatment on fruits and vegetables, forms a micro-nano level preservative coating layer on the surface of the fruits and vegetables, can effectively reduce the loss of water and nutrients on the surface and inside of the fruits and vegetables, reduces the gas permeability of the preservative coating layer, and significantly enhances the mechanical strength of the preservative coating layer.

This invention discloses a high-barrier composite blown film of EVOH / organically modified mica powder and its preparation method, belonging to the field of polymer composite materials and food packaging technology. The composite blown film consists of 90-99 parts by weight of blow-molding grade ethylene-vinyl alcohol copolymer and 1-10 parts by weight of organically modified mica powder. The organically modified mica powder is obtained by surface modification of muscovite powder with silane coupling agent KH-570, with the amount of KH-570 being 1.5-3.0 wt% of the mass of the muscovite powder. In the preparation process, muscovite powder is first added to an alcoholic aqueous solution of KH-570, stirred, filtered, washed, and dried to obtain organically modified mica powder; then, dried EVOH and organically modified mica powder are premixed and melt-blended and granulated using a twin-screw extruder; finally, the composite granules are blown into a film. This invention utilizes the high aspect ratio and hydrophobic surface of organically modified mica powder to form a tortuous path effect in the EVOH matrix, significantly reducing oxygen and water vapor permeability. It exhibits good thermal stability, simple process, and is suitable for barrier packaging of lipid-based foods.