2results about How to "Self-extinguishing" patented technology

A high-strength, chemically stable, flame-retardant closed-loop recycled plastic and its preparation and recycling method, belonging to the technical field of closed-loop recycled plastic preparation. The present invention utilizes reversible forces to connect rigid polymer chains with multifunctional flame-retardant crosslinking agents to construct reversible crosslinked plastics with high crosslinking degree, which have excellent mechanical properties, chemical stability and flame retardancy, and its strength is comparable to that of commercial engineering plastics such as PI and PEEK, etc. It can be immersed in corrosive liquids such as acids, alkalis, organic solvents, etc. for a long time without losing mechanical strength, and its flame retardancy reaches the highest level V0 of UL94 test. Controllable depolymerization can be achieved in acidic solutions, and monomer purification can be achieved by solution precipitation method, with a monomer recovery rate of >90%. The recovered monomers can be repolymerized into new plastics identical to the original materials. The present invention provides a simple and universal method for the design of closed-loop recyclable plastics with flame retardant properties, which is expected to be widely used in packaging, home furnishings, construction and other fields.

This invention relates to the field of polymer composite materials technology, specifically to an aramid composite foam material and its preparation method. The raw materials of the aramid composite foam material include: 0.5-1 parts of meta-aramid chopped fibers; 0.2-0.5 parts of meta-aramid precipitate; 0.05-0.2 parts of thermally expandable microspheres; 2-10 parts of water-based adhesive; 0.5-1 parts of surfactant; and 15-50 parts of deionized water. The preparation method of the meta-aramid precipitate is as follows: meta-phenylenediamine and isophthaloyl chloride are polymerized in a polar solvent to obtain a meta-solvent; the meta-solvent is then fully dispersed in water, followed by solid-liquid separation to obtain the meta-aramid precipitate. The aramid composite foam material exhibits uniform structure, low density, high strength, and temperature resistance with flame retardancy, and the preparation method is green and efficient.