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

This invention discloses a pressure-induced heating composite material, comprising: a flexible support layer, which is a PI film; a first triboelectric material layer, which is a CNT-OH / PVDF-HFP composite film, attached to one side of the flexible support layer; a second triboelectric material layer, which is an AgNW / PDMS composite film, attached to the other side of the flexible support layer; a pyramidal microstructure is constructed on the surface of the second triboelectric material layer; and a thermoelectric conversion layer, attached to either the first or second triboelectric material layer. The thermoelectric conversion layer is prepared by combining Bi2Te3 / Sb2Te3 heterojunction nanosheets, PEDOT:PSS hydrogel, and Ti3C2TxMXene, with each component being doped with each other to form a uniform dot-like spatial distribution structure. The material of this invention exhibits high response under low pressure because the pyramidal microstructure increases the contact area change rate by 400% under low pressure (≤5kPa) and achieves a charge density of 1.2–1.5 mC / m², breaking through the high-pressure triggering bottleneck of existing materials.

The utility model relates to the technical field of special performance products and composite materials, in particular to a composite material and an absorption article, and the composite material comprises an EPTFE (Expanded Polytetrafluoroethylene) film and a moisture-proof and gas-proof film which are laminated; a through hole is formed in the moisture-proof and gas-proof film; the EPTFE film and the moisture-proof and gas-proof film are bonded and fixed in partial areas; the moisture and gas insulation film is in direct contact with the EPTFE film, or a barrier layer is arranged between the moisture and gas insulation film and the EPTFE film. The composite material provided by the utility model has the advantages of high air permeability and low moisture permeability, so that part of moisture can be discharged from the core body, and the external environment cannot be influenced. In addition, residual liquid in the interlayer space can be sucked back into the absorption layer through the through holes, so that the air permeability of the composite material is kept, and the composite material has good comfort and leakage resistance.

The application discloses a fruit active fresh-keeping material and a preparation method and application thereof. Modified amphiphilic nano carbon particles are selected as a self-assembly coating, and an amphiphilic multi-walled carbon nanotube coating with high bacteriostatic effect is loaded on a self-developed substrate by using a self-assembly coating technology, so that a multilayer molecular film is formed on the surface of the substrate, metabolic gas and moisture permeability are effectively adjusted, the high oxygen resistance, low moisture permeability and excellent bacteriostatic function of the fruit active fresh-keeping material are realized. The fruit active fresh-keeping material prepared by the application contains a plurality of substances with natural bacteriostatic function in raw materials, adopts a substrate and a multilayer molecular film structure, guarantees mechanical properties, has high oxygen resistance, low moisture permeability and high bacteriostatic performance, better blocks microorganisms and environmental pollution, can adjust a fruit storage sealed micro-gas environment, reduces a physiological metabolic rate of the fruit, realizes the functions of prolonging fruit storage time and shelf life, and improves quality safety of the fruit.