2results about How to "Does not affect biodegradability" patented technology

This invention belongs to the field of polymer materials technology, specifically relating to a high-barrier, biodegradable, and flame-retardant composite material, its preparation method, and its applications. The technical solution provided by this invention can obtain a high-barrier, biodegradable, and flame-retardant composite material without compromising the effectiveness of the components. The modified black phosphorus nanosheets possess barrier properties, extending the gas permeation path through their two-dimensional layered structure. Simultaneously, the flame retardant has a core-shell structure; the silica coating prevents direct contact between magnesium hydroxide and the matrix. Upon contact with fire, magnesium hydroxide decomposes and absorbs heat (endothermic heat > 1300 J / g), releasing water vapor to dilute oxygen. The SiO2 shell melts to form a dense ceramic layer, synergistically achieving a better flame-retardant effect. The composite material provided by this invention has stronger barrier properties, effectively protecting the contents; it is biodegradable and environmentally friendly; and it has better flame retardancy, thus better preventing safety hazards.

The invention relates to the technical field of air filter materials, and discloses a nanofiber-based low-resistance air filter material and a preparation method thereof.The air filter material comprises a three-layer composite structure which sequentially comprises a surface layer, a middle layer and a bottom layer from top to bottom; the surface layer is prepared from the following raw materials in parts by mass: 35 to 45 parts of PLA (Polylactic Acid) fiber and 5 to 10 parts of PBS (Phosphate Buffer Solution) fiber; the bottom layer is prepared from the following raw materials in parts by weight: 60-70 parts of broadleaf wood fibers, 5-15 parts of cotton fibers and 10-30 parts of regenerated cellulose fibers; the middle layer is a composite nanofiber membrane layer formed on the surface layer through electrostatic spinning, and a spinning solution adopted for electrostatic spinning comprises an acrylonitrile-methyl methacrylate copolymer, maleic anhydride grafted PLA, an additive and a solvent. Different fiber materials are adopted to construct a three-layer composite structure, the filtering efficiency and bursting strength are greatly improved, and the high-performance, low-resistance, efficient and environment-friendly air filtering material is obtained.