2results about How to "Raw green" patented technology

The application belongs to the technical field of bio-based packaging materials, and particularly relates to a novel double-layer composite film and application thereof. The novel double-layer composite film comprises the following steps: reacting palmitic anhydride and carboxymethyl cellulose to obtain carboxymethyl cellulose palmitate; adding a pH-sensitive natural dye indicator to obtain carboxymethyl cellulose palmitate nanoemulsion containing a pH-sensitive substance; then loading a natural polymer material to prepare a film material; finally adding the film material to the carboxymethyl cellulose palmitate to prepare a composite film, thereby obtaining the novel double-layer composite film. The double-layer composite film can be self-emulsified without adding a surfactant, and has the ability to load functional indicator (pH-sensitive color indicator) substances; meanwhile, the barrier performance of the film material, such as a chitosan film, to water vapor and oxygen is improved, and the double-layer composite film has a very promising application in food or fruit preservation. The method provided by the application is not only green in raw materials, but also uses a flow casting method, which can be applied to industrial production and has a good application prospect.

The application belongs to the technical field of nanomaterials and lubrication, and discloses a hydrophobic modified graphene quantum dot, a preparation method thereof and application of the graphene quantum dot in lubricating oil, and the preparation method comprises the following steps: (1) using citric acid as a carbon source, hydrophilic GQDs are prepared by a pyrolysis method; (2) using o-xylene as a solvent and lauric acid as a modification reagent, the hydrophilic GQDs are subjected to hydrophobic modification, and then the hydrophobic modified graphene quantum dot is obtained by low-temperature precipitation, centrifugation and purification, and can be applied in lubricating oil. The application solves the problems that traditional GQDs are prone to agglomeration, have poor dispersibility and limited lubricating effect in non-polar lubricating oil, and the prepared hydrophobic graphene quantum dot has excellent friction-reducing and wear-resisting synergistic effect, can form a continuous and uniform protective layer rich in carbon and oxygen at a friction interface, can simultaneously reduce a friction coefficient and a wear volume, the lowest friction coefficient is 0.063, the wear volume is reduced by 90.84%, and the comprehensive lubricating performance is outstanding.