23 results about "Biodegradable polyurethane" patented technology

The invention relates to a multilayer packaging material with high barrier property and application thereof. The multi-layer packaging material at least comprises three layers, namely a layer A, a layer B and a layer C, wherein the layer B is located between the layer A and the layer C; the layer A is prepared from the following raw materials: first biodegradable polyurethane and a cellulose nanocrystal graft which is obtained by performing grafting treatment on cellulose nanocrystal after hydrophobic modification, and the content of the cellulose nanocrystal graft is 1wt%-10wt% of that of the first biodegradable polyurethane; the raw material of the layer B comprises biodegradable polyester containing a glycollic acid structural unit, and the content of the glycollic acid structural unit is not less than 60% mol; the raw material of the layer C comprises second biodegradable polyurethane. The hydrophobic modified cellulose nanocrystals are uniformly dispersed in the layer A, so that the adsorption of water vapor on the layer A is reduced, the permeation of the water vapor is hindered, and the barrier property of the whole material is improved.

The invention relates to a biodegradable polyurethane material as well as a preparation method and application thereof. The biodegradable polyurethane material comprises biodegradable polyurethane and a cellulose nanocrystal graft, wherein the cellulose nanocrystal graft is obtained by carrying out grafting treatment on cellulose nanocrystal after hydrophobic modification, and the addition amount of the cellulose nanocrystal graft is 0.1-10 wt% of that of the biodegradable polyurethane. Hydrophobic modification and grafting treatment are carried out on the cellulose nanocrystals, so that adsorption of water vapor on the surface layer of polyurethane is reduced, permeation of the water vapor is hindered, and the situation that the mechanical performance is reduced or fails due to degradation after the polyurethane meets water is avoided.

The invention relates to a biodegradable polyurethane material as well as a preparation method and application thereof. The biodegradable polyurethane material comprises biodegradable polyurethane and a cellulose nanocrystal graft, wherein the cellulose nanocrystal graft is obtained by carrying out grafting treatment on cellulose nanocrystal after hydrophobic modification, and the addition amount of the cellulose nanocrystal graft is 0.1-10 wt% of that of the biodegradable polyurethane. Hydrophobic modification and grafting treatment are carried out on the cellulose nanocrystals, so that adsorption of water vapor on the surface layer of polyurethane is reduced, permeation of the water vapor is hindered, and the situation that the mechanical performance is reduced or fails due to degradation after the polyurethane meets water is avoided.

The invention discloses a functional ecological degradable fabric production process, and relates to the technical field of functional fabrics, and the functional ecological degradable fabric production process comprises the following steps: mixing a water-based biodegradable polyurethane emulsion, a laccase-dopamine hybrid modified nano cellulose filler, a leveling agent and deionized water, stirring at a high speed, and standing for defoaming to obtain a coating emulsion; and uniformly applying the coating emulsion to polyester fiber base cloth by adopting an anilox roller coating mode, and sequentially carrying out pre-drying and baking cross-linking curing on the coated fabric, so as to obtain the functional ecological degradable fabric. The invention provides the production process of the fabric with high mechanical strength, long-acting and lasting antibacterial property and intelligent controllable degradation characteristics, the produced fabric is stable in structure and lasting in function, self-degradation can be started according to preset conditions after the fabric is discarded, and meanwhile, the core function of the fabric can still be kept stable in an extreme use environment.

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 application discloses a biodegradable polyurethane sound-absorbing foam composite material, and relates to the technical field of polymer materials.The composite material comprises the following components in mass fractions: 100-120 parts of carbon dioxide-based polyester polyol; 30-50 parts of bio-based polyether polyol; 90-120 parts of polyisocyanate; 10-20 parts of sound-absorbing modified filler; 7.5-12.5 parts of foaming agent; 0.3-0.9 parts of catalyst; 0.8-1.5 parts of foam uniformizing agent; 1.5-3.0 parts of crosslinking agent; 8-15 parts of flame retardant; 0.5-1.5 parts of stabilizer; and 0.5-2.0 parts of antibacterial agent.The bio-based polyether polyol, the sound-absorbing modified filler, the foaming agent, the catalyst, the foam uniformizing agent, the crosslinking agent, the flame retardant, the stabilizer and the antibacterial agent are added to form a bio-based polyol system with the carbon dioxide-based polyester polyol, so that the low-carbon environmental protection and the basic performance of the material are considered, the various additives are synergistically enhanced, and the foam composite material is integrated with multiple functions such as biodegradation, sound absorption, flame retardation, antibiosis and stability.

The application belongs to the technical field of polyurethane, and relates to a kind of polyurethane material and its preparation method and application.The biodegradable polyurethane has the structure shown in formula (1).The polyurethane provided by the application has controllable degradation performance and excellent mechanical properties to meet the use requirements of different application scenarios.

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.

The invention discloses a reusable biodegradable anti-static operating gown fabric and a preparation process thereof, and relates to the field of medical composite materials, the reusable biodegradable anti-static operating gown fabric comprises a first layer of base cloth, a middle layer of degradable polyurethane formate (PU) and a third layer of base cloth, the first layer of base cloth and the third layer of base cloth are made of 50D biodegradable polyester low stretch yarns (DTY) and 20D conductive filaments through warp knitting; and the middle layer consists of a degradable polyurethane (PU) film and a modified polyurethane adhesive. The method has a perfect preparation process flow, and meanwhile, the surgical gown fabric has the functions of high waterproofness, high bacteria resistance and static resistance, is free of flocculus removal, can be repeatedly used (after more than 80 times of circulation, one circulation comprises four procedures of washing, disinfection, drying and sterilization), is easy to clean, can be biologically degraded and is low in pollution.

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 present invention relates to a biodegradable polyurethane urea elastic yarn and a manufacturing method thereof. By applying an ester-based polyol, the biodegradable polyurethane urea elastic yarn of the present invention can be effectively biodegraded in a short time while having excellent yarn power.

To provide a polyisocyanate composition exhibiting superior biodegradability and mechanical characteristics when being made into a coating film.SOLUTION: A polyisocyanate composition comprising a polyisocyanate having an allophanate group derived from (A), (C), and (D), wherein (A) is at least one diisocyanate selected from the group consisting of an aliphatic diisocyanate and an alicyclic diisocyanate, (C) is a polyester polyol or a polycaprolactone polyol having a number average molecular weight Mn of 500 or more and 4,000 or less and being difunctional or trifunctional, and (D) is a hydrophilic component, wherein, based on a total mass of the polyisocyanate composition, a content of (C) is more than 50 mass% and 85 mass% or less, and a content of (D) is 0.1 mass% or more and 20 mass% or less.SELECTED DRAWING: None

The invention discloses recyclable and biodegradable polyurethane foam as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: initiating a cyclic ester monomer to perform ring opening polymerization through an initiator to obtain aliphatic polycyclic ester polyol; the aliphatic polycyclic ester polyol is directly used for preparing the polyurethane foam through a chemical foaming process. The polyurethane foam is prepared by the preparation method of the polyurethane foam. The recovery method of the polyurethane foam comprises the following steps: carrying out pyrolysis recovery on the polyurethane foam; wherein the pyrolysis recovery comprises the step of adding a pyrolysis catalyst for depolymerization to obtain a pure cyclic ester monomer, and pyrolysis residues can be recovered by chemical solvent decomposition or directly reused. According to the invention, the aliphatic polycyclic ester-based polyurethane foam which is easy to recover and degradable is prepared from the polycyclic ester polyol, a repolymerizable monomer with high yield and high purity can be recovered and obtained only through simple decompression pyrolysis, and in addition, the foam can be naturally degraded into a small molecular compound which is harmless to the environment in the environment.

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.

There are provided tissue repair laminates which promote cellular in-growth but also prevent or mitigate tissue adhesion. The laminates comprise a biodegradable polyurethane foam layer which facilitates cellular infiltration and a polyurethane barrier layer which is non-adhesive to tissue. The laminates resist shrinkage under in vivo conditions and possess desirable mechanical properties. The laminates find use in, for example, the repair of herniated tissue, particularly, but not limited to hernias in the abdominal wall.

The present invention discloses a thermostabilizing system 100 for the storage and transport of hot goods, particularly food. The system combines a biodegradable polyurethane insulated container 102 with a novel phase change material to achieve improved retention times and temperature ranges. The thermostabilizing system demonstrated in the present invention has achieved retention times of 10-14 hours at temperatures ranging from 45-70°C.

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.