4 results about "Biodegradable polyurethane" patented technology

This invention discloses a biomass fiber-reinforced biodegradable polyurethane foam packaging material and its preparation method, belonging to the field of new energy packaging materials and preparation technology. The biomass fiber-reinforced biodegradable polyurethane foam packaging material of this invention comprises the following components by weight: 40-60 parts of biodegradable polyurethane prepolymer, 20-35 parts of composite modified biomass fiber, 3-8 parts of foaming agent, 5-12 parts of flame retardant additive, 1-3 parts of crosslinking agent, 0.5-1.5 parts of anti-aging agent, 0.3-1 part of release agent, and 1-2 parts of water. During the preparation of the biodegradable polyurethane prepolymer, 0.1-0.3% of nano-zinc oxide catalyst by weight of the prepolymer is added, which increases the catalytic efficiency by more than 25%, shortens the prepolymerization reaction time by 30%, thereby improving the stability of the prepolymer, avoiding shrinkage defects during later foaming, and preventing the release of toxic and harmful substances. This solves the technical problems of poor environmental performance and difficulty in synergistically combining mechanical strength and cushioning performance in existing new energy packaging materials.

The present invention discloses a thermostable system 100 for storage and transportation of hot goods, especially of food items. The said system combines an insulation container 102 made of biodegradable polyurethane with a novel phase change material to provide improved holding time and temperature ranges. With the thermostable system set-forth by the present invention, 10-14 hours of holding time in the range of 45-70° C. was achieved.

This invention discloses a biodegradable polyurethane elastomer, its preparation method, and a force-electro-coupled artificial blood vessel, belonging to the field of biomedical materials. The process includes: mixing soft segment glycol and functionalized chain extender 1 under nitrogen protection, reacting under stirring and heating conditions, and then cooling to obtain reactant a; adding diisocyanate to continue the reaction to obtain a polyurethane prepolymer; dissolving functionalized chain extender 2 in solvent a, adding it dropwise to the prepolymer to obtain reactant b, precipitating it in solvent b and vacuum drying to obtain the biodegradable polyurethane elastomer. This invention uses bioactive molecules with anticoagulant and anti-inflammatory effects as functionalized chain extenders, endowing the biodegradable polyurethane elastomer with a stable structure and piezoelectric properties. The artificial blood vessel can achieve continuous dynamic regulation of the regenerative microenvironment throughout the entire degradation cycle, continuously releasing anticoagulant and anti-inflammatory bioactive molecules, which has significant clinical application value.

The application discloses an inlaid biodegradable polyurethane / lignin composite material and a preparation method and application thereof. The preparation method of the inlaid biodegradable polyurethane / lignin composite material comprises the following steps: (1) obtaining NCO-terminated polyurethane prepolymer by taking polycaprolactone, polycarbonate diol and polyisocyanate as raw materials; (2) mixing and stirring lignin with the NCO-terminated polyurethane prepolymer under a solvent-free condition; (3) adding glycerol or 1,4-butanediol into the system to perform a chain extension reaction, so as to obtain a chain-extended product; and (4) vulcanizing the chain-extended product to obtain the inlaid biodegradable polyurethane / lignin composite material. The application provides application of the composite material in preparation of an armored track shock-absorbing block. The polyurethane / lignin composite material prepared by the application has high strength, low compression permanent deformation and biodegradability and the like, and can improve the bearing capacity and durability of the armored track as a whole.