11 results about "Biodegradable polyurethane" patented technology

To provide a technology that enables the production of a polyurethane foam suitable for seedling cultivation while also being biodegradable. [Solution] This technology provides a biodegradable polyurethane foam for seedling cultivation obtained from a composition containing a polyol and a polyisocyanate, wherein the polyol contains a biodegradable polyol, the polyisocyanate contains an aliphatic isocyanate and / or an alicyclic isocyanate, and the number of cells is 5 or more per 25 mm.

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 utility model provides a measuring tank for polyurethane storage, which comprises an upper sealing cover, an outer tank body is arranged on the surface of the lower end of the upper sealing cover, an adjusting rotary rod is arranged on the surface of the upper end of the upper sealing cover, a through hole is formed in the surface of the top of the upper sealing cover, and a support frame is arranged on the outer surface of the outer tank body. A material gathering bottom cover is arranged on the surface of the lower end of the outer tank body, and a particle flow detector is arranged at the lower end of the material gathering bottom cover so as to solve the problems that in the actual use process, due to the fact that polyurethane is divided into high-temperature-resistant polyurethane, biodegradable polyurethane and flame-retardant polyurethane, a plurality of metering tanks need to be arranged for classification, and when materials need to be taken out, the material gathering bottom cover is arranged, and the particle flow detector is arranged at the lower end of the material gathering bottom cover. Materials need to be taken respectively, and a plurality of metering tanks occupy space.

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 relates to a biodegradable polyurethane and its preparation method. The biodegradable polyurethane comprises a first structural unit, a second structural unit, a third structural unit, and a fourth structural unit. The first structural unit is a polyester oligomer diol residue, the second structural unit is a small molecule diol residue, the third structural unit is a small molecule monool residue, and the fourth structural unit is a diisocyanate residue. The first structural unit serves as the soft segment of the polyurethane. The first and fourth structural units are linked by a urethane ester. The second and fourth structural units are linked by a urethane ester to form the hard segment of the polyurethane. The third and fourth structural units are linked by a urethane ester to form the end groups of the polyurethane. During preparation, the polyester oligomer diol, a catalyst, lysine diisocyanate, and a portion of the solvent are added to a reactor for reaction. Then, a chain extender and the remaining solvent are added, and finally, a terminator is added to the reaction. This invention has a simple method; the product exhibits excellent degradation performance.

The application provides a carbon dioxide-based biodegradable polyurethane fiber and a preparation method and application thereof, and the preparation raw material of the carbon dioxide-based biodegradable polyurethane fiber comprises poly(carbonate-ether) glycol, aromatic polyisocyanate, an aliphatic alcohol chain extender with a carbon chain length not lower than 10, an amine chain extender with a carbon chain length not lower than 10 and an amine chain terminator; the poly(carbonate-ether) glycol with biodegradability is selected as a soft segment, the aromatic polyisocyanate is matched as a hard segment, and the aliphatic alcohol chain extender with a carbon chain length not lower than 10 and the amine chain extender are matched and introduced for chain extension, so that the finally prepared carbon dioxide-based biodegradable polyurethane fiber has excellent biodegradability and mechanical properties, and in particular, has high toughness.

This invention discloses a method for preparing a biodegradable polyurethane material, comprising the following steps: (1) under an inert atmosphere, decanolide monomer, alcohol initiator and ring-opening polymerization catalyst are mixed, and after reaction, the reaction product is dissolved in an organic solvent and then precipitated in cold methanol, filtered and dried to obtain polydecanolide prepolymer; wherein, the molar ratio of the alcohol initiator to decanolide monomer is 1:100~600; (2) the polydecanolide prepolymer is vacuumed at 20~100℃ for 4~20h, then isocyanate and polycondensation catalyst are added to it, and the reaction is carried out at 20~120℃ for 1~20h to obtain polyurethane precursor; (3) the polyurethane precursor obtained by the reaction, cyclodextrin, organic solvent and catalyst are mixed, and the reaction is carried out at 60~120℃ for 12~24h, and the obtained product is dried to obtain polyurethane material. The polyurethane material of this invention has both good biodegradability and mechanical properties.

The invention relates to the field of sponges, and particularly discloses a modified soft polyurethane sponge which is of an integrally-formed three-layer gradient structure and sequentially comprises a substrate bottom layer, a supporting core layer and a surface layer from bottom to top, and the substrate bottom layer is made of a biodegradable polyurethane material with a main chain containing ester bonds and glucosidic bonds; the supporting core layer is compounded on the substrate bottom layer and is made of a composite material of lignin-based polyurethane and natural plant fibers; the surface layer is compounded on the supporting core layer and is formed by a composite material of non-isocyanate polyurethane and biodegradable microcapsules encapsulated with an antibacterial agent; the preparation method of the modified soft polyurethane sponge comprises the following steps: preparing a surface layer foaming material, preparing a supporting core layer foaming material, preparing a substrate bottom layer foaming material, carrying out layered pouring and integrated foaming, and carrying out compression shaping, cutting and surface functionalization treatment on the cured sponge to obtain a final product. The spanning from single performance optimization to system problem solving is realized, and normal form transformation of a polyurethane sponge modification technology is represented.

The invention discloses a continuous production system for biodegradable polyurethane, and relates to the technical field of high polymer material production, and the continuous production system comprises a raw material pretreatment module for drying, filtering, crushing and homogenizing various raw materials and then storing in a sealed manner; the proportioning metering module dynamically adjusts the raw material proportioning and mixes and conveys the raw materials; the continuous reaction module regulates and controls temperature and pressure regionally to push the raw materials to fully react to form a prepolymer; the forming module is matched with a forming process regulation and control parameter guarantee effect; the waste recycling module is used for recycling waste after treating the waste; the quality detection module collects data in real time and feeds back the data; and the control system module adjusts the parameter recording data in a linkage manner to form a traceable file. The full-process continuous production of the biodegradable polyurethane is realized, the production efficiency and the product performance stability are improved, and the forming precision and the raw material purity are guaranteed; resource circulation is realized through closed-loop waste recovery, and the production process is intelligently regulated, controlled and optimized.

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.