216 results about "Polyhydroxybutyrate" patented technology

The invention discloses a preparation method of a slow-release oxygen agent for reducing methane emission, which mainly comprises the following steps: preparing a PHB (polyhydroxybutyrate) solution, adding CaO2, copper sulfate (CuSO4) and goethite (FeO (OH)) into the PHB solution, and drying to prepare a spherical degradable slow-release oxygen agent embedded with CaO2 / CuSO4 / FeO (OH). The degradable slow-release oxygen agent prepared by the invention can inhibit methane generation and promote methane oxidation consumption, gets rid of the limitation that only the methane generation process is inhibited and the methane oxidation consumption is not promoted when CaO2 is directly added, and effectively solves the water quality problems that the action period is short, the pH is increased and the like when powder CaO2 is added. The invention further discloses an application method of the slow-release oxygen agent for reducing methane emission, the slow-release oxygen agent is added into slow-flow water body sediments in a shallow injection mode of 4-8 cm under mud, the utilization efficiency of oxygen in CaO2 and the emission reduction effect on methane in the sediments can be improved, and the action depth of the slow-release oxygen agent on the slow-flow water body sediments is increased.

An object of the present invention is to provide a coated paper that includes a coating layer containing poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) with few coating defects. As a solution, the present invention provides a coated paper including a coating layer containing poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and an adhesive, on at least one side of a paper substrate. A solid content weight ratio of the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) to the adhesive in the coating layer is 99.9 / 0.1 to 60.0 / 40.0.

The present invention discloses a degradable high-barrier composite BOPP matting film. The present invention also discloses a preparation method of the above-mentioned degradable high-barrier composite BOPP matting film. Tannic acid is added to a single-layer magnesium-aluminum hydrotalcite colloid, the system is adjusted to be alkaline, and stirring is continued for 1-3 h. Then it is mixed uniformly with polypropylene and added to an extruder, and melt-extruded at 180-200 °C to obtain a composite polypropylene resin. The composite polypropylene resin, polyhydroxybutyrate, polylactic acid, and cross-linking agent are blended and cast into a base film blank with a thickness of 0.1-1 mm. The matting agent and the slip agent are mixed uniformly, melt-extruded and formed, and then added to the base film blank to obtain a matting blank. The matting blank is biaxially stretched at 80-90 °C, the stretching speed is 40-70 mm / s, the stretching ratio is 4-10, and the stretched blank is irradiated with an electron beam in a nitrogen atmosphere to obtain the degradable high-barrier composite BOPP matting film.

The invention discloses a bio-based material composite hose and a preparation method thereof, and belongs to the technical field of aluminum-plastic pipes, the bio-based material composite hose provided by the invention comprises a hose head and a hose body, the hose body is formed by lapping bio-based material composite sheets, the bio-based material composite sheet sequentially comprises an outer polylactic acid film, a bonding layer, an aluminum foil, a bonding layer and an inner polylactic acid film, the outer-layer polylactic acid film or the inner-layer polylactic acid film is prepared from the following components in parts by weight: 70 to 90 parts of polylactic acid, 5 to 20 parts of polyhydroxybutyrate-co-valerate and 10 to 30 parts of long carbon chain terminated hyperbranched polycaprolactone. According to the invention, the modified polylactic acid film with complete biodegradability is used in the composite hose, the modified polylactic acid film can be degraded under the action of microorganisms after the use cycle is ended, the aluminum foil is convenient to recycle, and the biocompatibility of the modified polylactic acid film is more beneficial to the application in food packaging, biological medicine packaging and cosmetic packaging.

The invention belongs to the technical field of 3D printing materials, and particularly relates to an FDM 3D printing long-acting noctilucent material and a preparation method thereof. The polylactic acid is used as a main body material, the noctilucent material is added, meanwhile, the modified polyhydroxybutyrate and the anhydride modified montmorillonite are introduced, and through the synergistic effect of all the components, the tensile strength and the oxygen index of the 3D printing material are improved while the long-acting noctilucent effect is achieved.

The invention discloses a degradable waterproof and oilproof paper pulp molded product and a preparation method thereof. The preparation method comprises the following steps: S1, pretreatment of polyhydroxybutyrate; s2, preparing modified starch; s3, coating the polyhydroxybutyrate with the modified starch; s4, preparation of modified montmorillonite; and S5, preparing the paper pulp molded product. According to the paper pulp molded product, the degradable oleophobic and hydrophobic high polymer material polyhydroxybutyrate is introduced, the degradability of the paper pulp molded product is guaranteed, the waterproof and oil-proof performance of the paper pulp molded product is improved, the polyhydroxybutyrate is coated with the modified starch, the compatibility of the polyhydroxybutyrate and paper pulp fibers is improved, and the paper pulp molded product has the advantages of being environmentally friendly and free of pollution. The overall quality of a paper pulp molded product is ensured; meanwhile, the added modified montmorillonite and the modified starch coated polyhydroxybutyrate can synergistically improve the barrier property of a paper pulp molded product, and the waterproof and oil-proof properties of the paper pulp molded product are jointly improved.

This extruded film contains a poly(3-hydroxyalkanoate)-based copolymer (A) and a poly(3-hydroxybutyrate) (B). The copolymer (A) preferably contains at least two types of poly(3-hydroxyalkanoate)-based copolymers having different constituent monomer types and / or constituent monomer content ratios. The copolymer (A) may include a copolymer (A-1) of a 3-hydroxybutyrate unit and another hydroxyalkanoate unit, wherein a content ratio of the other hydroxyalkanoate unit is 24 mol% or more.

The invention belongs to the technical field of high polymer materials, and provides a polylactic acid composite material with a Pickering microsphere interwoven structure and a preparation method of the polylactic acid composite material. The method specifically comprises the following steps: carrying out TEMPO oxidation reaction on bacterial cellulose, then carrying out nanocrystallization treatment, emulsifying an obtained oxidized nano bacterial cellulose aqueous suspension and a poly (3-hydroxybutyrate-co-3-hydroxyvalerate) composite organic solution of a polylactic acid main material, drying, and carrying out hot pressing to obtain the polylactic acid-poly (3-hydroxybutyrate-co-3-hydroxyvalerate) composite material. According to the invention, on the basis of the amphiphilic characteristic of the oxidized nano bacterial cellulose, hydrophobic modification is not needed, a polylactic acid system structure is stabilized in the composite material through network sphere interweaving by using a Pickering emulsification microsphere method, polylactic acid heterogeneous nucleation is induced by the nano size to promote crystallization, and the mechanical strength, heat resistance and barrier property of polylactic acid are improved. Meanwhile, by adding the biopolyester PHBV, the toughness and barrier property of the polylactic acid composite material are enhanced, and the biodegradability is maintained.

A surgical system including an implantable medical device having a size and shape. The surgical device having a substrate and a coating that covers at least a portion of the substrate. The coating includes a polymer, collagen, glycerin and a hemostatic agent. The polymer is selected from the group of polyhydroxybutyrate, polyglycerol sebacate and adducts of polyglycerol sebacate. The substrate including a first piece and a second piece that is joined with the first piece. The first piece and the second piece forming a pocket having a cavity and an opening that is in communication with the cavity. The device being pre-formed such that a size and shape of the cavity conforms to the size and shape of the implantable medical device.

The invention relates to the technical field of dental floss pick injection molding materials, in particular to a PHA degradable injection molding material for dental floss picks and a preparation method of the PHA degradable injection molding material. The invention relates to a PHA degradable injection molding material for a floss pick. The PHA degradable injection molding material is prepared from the following components: bio-based poly (3-hydroxybutyrate), nano cellulose fibers, a polylactic acid copolymer, poly (butylene adipate-co-butylene terephthalate), graphene nanosheets, zinc stearate, an antioxidant 1010 and silver nanoparticles. The full-biodegradable material is adopted, the bio-based content reaches up to 70% or above, degradation can be achieved under the household composting condition, and the problem that traditional dental floss picks are difficult to degrade after being used in a large amount is solved; by optimizing the formula, the material has high rigidity and is suitable for being used as materials such as knives, forks and spoons; by optimizing the processing technology, simplifying the preparation process and reducing the strict requirements on equipment and technology, the preparation process is simpler and more convenient.

To provide coated paper that retains desirable hot water resistance and includes a PHBH-coated layer hard to swell and soften by water.SOLUTION: Coated paper includes at least on one surface of a paper base material thereof: an under coated layer including PHBH (poly (3-hydroxybutyrate-co-3-hydroxyhexanoate)), inorganic pigments and an adhesive; and a top coated layer including PHBH, where the adhesive includes polyvinyl alcohol-based resin having a saponification degree of 90% or higher, and Cobb water absorbency to 90°C hot water after 30 minutes of a contact time is 25 g / m2 or less.SELECTED DRAWING: None

The present invention belongs to the technical field of poly 3-hydroxybutyrate utilization, and relates to a method for preparing R-3-hydroxybutyrate by catalyzing the degradation of poly 3-hydroxybutyrate with sodium bisulfate as a catalyst. Poly 3-hydroxybutyrate, sodium bisulfate catalyst and solvent are mixed evenly and reacted, and after the reaction is completed, the temperature is lowered, water is added and stirred for stratification, and the upper solution is distilled to recover the solvent and the target product, and the lower solution is evaporated and concentrated, and sodium bisulfate is recovered by cooling and crystallization. The method of the present invention is simple in process and easy to operate, solves the problems of large environmental pollution, inability to recycle and reuse, and troublesome post-processing of traditional homogeneous catalysts, realizes the recovery and reuse of catalysts, and efficiently prepares R-3-hydroxybutyrate at the same time, with a yield of up to 128wt%, and a sodium bisulfate recovery rate of 96%.

The application provides a preparation method of piezoelectric nanofiber aerogel, comprising the following steps: S1, zinc oxide is added into hexafluoroisopropanol, polyhydroxybutyrate is added after ultrasonic dispersion, and magnetic stirring is conducted to obtain a PHB@ZnO solution; S2, the PHB@ZnO solution is prepared into a nanofiber membrane through electrospinning, the nanofiber membrane is placed into a vacuum drying box for vacuum drying to obtain a PHB@ZnO nanofiber membrane; S3, the PHB@ZnO nanofiber membrane is added into deionized water, and a short PHB@ZnO nanofiber dispersion liquid is obtained after homogenization; S4, chitosan powder is added into deionized water, glacial acetic acid is added after stirring, and chitosan solution is obtained after continuous stirring; S5, the short PHB@ZnO nanofiber dispersion liquid, the chitosan solution and glutaraldehyde are uniformly mixed to obtain a mixture, the mixture is poured into a mold, the mold is placed into a freeze dryer for freeze drying to obtain piezoelectric nanofiber aerogel. The piezoelectric nanofiber aerogel prepared by the piezoelectric nanofiber aerogel has a porous structure and good piezoelectric performance, and can accelerate bone defect repair.

The invention discloses a self-degradable biomass composite fiber and a preparation method thereof, and relates to the technical field of high polymer material preparation, and the self-degradable biomass composite fiber comprises the following components by weight: 40-60 parts of plant fiber composite polylactic acid; 20 to 30 parts of polyhydroxybutyrate; 10 to 20 parts of nano cellulose; 5 to 10 parts of acetylated lignin; 3-5 parts of a citrate plasticizer; 2 to 4 parts of sodium alginate; the components are all natural derived and biological fermentation products, and the total bio-based carbon content is greater than 85%. Through the component design of the biomass composite fiber, the function of precise and controllable degradation performance is realized, multi-stage degradation mechanisms are cooperated, the proportion of polyhydroxybutyrate to nanocellulose is adjusted, the degradation period is flexibly regulated and controlled, different scene requirements are met, the application range is expanded, low-temperature spinning is matched, the unification of high performance and low energy consumption is realized, and the preparation method is suitable for industrial production. And industrialization landing is promoted.

A method for producing a laminate having a substrate layer and a resin layer formed on at least one side of the substrate layer, the resin layer containing a poly(3-hydroxybutyrate)-based resin and having a weight per unit area (dry weight) of 15 to 50 g / m 2 On the surface of the substrate layer, an aqueous dispersion (HB-A) containing a poly(3-hydroxybutyrate)-based resin (a1) and a dispersant (a2) containing a water-soluble high molecule is applied to form a coating film (a), and heating is performed to form a coating layer (A) having a weight per unit area (dry weight) of 0.5 to 10 g / m 2 On the surface of the coating layer (A), an aqueous dispersion (HB-B) containing a poly(3-hydroxybutyrate)-based resin (b1) and a dispersant (b2) containing a water-soluble high molecule is applied to form a coating film (b), and heating is performed to form a coating layer (B). The content of the dispersant (b2) containing a water-soluble high molecule is 0 to 0.5 parts by weight per 100 parts by weight of (b1).

The invention relates to a disinfection product, in particular to a povidone iodine disinfection product. The povidone-iodine disinfectant is prepared from the following components in percentage by mass: 0.1 to 1 percent of povidone-iodine, 0.001 to 0.01 percent of PHB (Polyhydroxybutyrate) liposome nanoparticles, 0.03 to 0.1 percent of pH (Potential of Hydrogen) regulator, 0.5 to 1.5 percent of humectant and the balance of purified water, the preparation method of the disinfectant comprises the following steps: preparing a solution of the PHB liposome nanoparticles containing povidone iodine; weighing a solution of the povidone-iodine-containing PHB liposome nanoparticles according to a prescription amount, adding the solution into a preparation tank, adding a proper amount of purified water, and uniformly stirring and dissolving; weighing the pH regulator according to the prescription amount, adding the pH regulator into the preparation tank, and uniformly stirring; weighing the moisturizing agent according to the prescription amount, adding the moisturizing agent into the preparation tank, adding the rest purified water, stirring and dissolving uniformly, and filtering to obtain the disinfectant. The disinfectant does not need to be diluted before being used, can be directly used, is convenient to operate, has good stability and adhesiveness and is free of irritation; meanwhile, the preparation process is safe and simple.

A method for producing a stretched film includes the steps of: (i) melting a film raw material and extruding the molten film raw material onto a cast roll to mold a film; (ii) separating the film from the cast roll at a temperature of 0 to 60° C.; and (iii-a) stretching the film in an MD direction at a temperature of 10 to 75° C., and the stretched film contains 100 parts by weight of a poly(3-hydroxybutyrate) resin and 1 to 100 parts by weight of another resin with a glass transition temperature lower than 0° C. The method may further include either or both of the steps of (iii-b) stretching the film in a TD direction at a temperature of 10 to 80° C.; and (iv) heating the film to a temperature that is 10° C. or more above the temperature during the step (iii-a) or (iii-b) and that is 70° C. or higher.

A process for the synthesis of poly-4-hydroxybutyrates is described, comprising the use of a kit of (i) one or more bases comprising alkali metal cations and (ii) one or more alcohols in said process, as well as the poly-4-hydroxybutyrates obtainable by said process.

The invention discloses a preparation method and application of a bio-based polyester porous membrane, an organic solvent is used as a poly-3-hydroxybutyrate-co-4-hydroxybutyrate solvent, water is used as a non-solvent, and a phase inversion method is adopted to prepare the porous membrane. By adjusting the concentration of the membrane casting solution and the temperature of the coagulating bath, the phase separation behavior in the membrane forming process is regulated and controlled, the poly-3-hydroxybutyrate-co-4-hydroxybutyrate porous membrane with a controllable structure is prepared, and the porous membrane is uniform in pore distribution and high in porosity. The preparation method of the green polymer porous membrane material, provided by the invention, has the advantages of low cost, simple method, easiness in operation, energy conservation, environment friendliness and the like, and has a wide application prospect in the fields of oil-water separation, lithium ion batteries and the like; the problems of non-uniform pore size distribution, poor repeatability and the like of the existing polyhydroxyalkanoate in the phase separation film forming process are solved.

The present invention relates to the technical field of biomaterials, and discloses a biodegradable polyurethane elastomer, a preparation method thereof and an application. The preparation method comprises the following steps: (1) Using polycaprolactone diol, poly-3-hydroxybutyrate, polyethylene glycol, diisocyanate and 2-hydroxyethyl methacrylate as raw materials, under a nitrogen or inert gas environment, preparing a vinyl-terminated polyurethane prepolymer; (2) Heating the product in (1), adding a diluent, mixing evenly, adding an initiator, and raising the temperature for reaction for 3 to 4 h to obtain a biodegradable polyurethane elastomer; using the prepared biodegradable polyurethane elastomer to prepare an artificial tissue engineering hard bone tissue material. The present invention uses three kinds of diols as raw materials, as a mixed soft segment for preparing the biodegradable polyurethane elastomer, exerts the synergistic effect of the three kinds of diols, and regulates the biodegradation rate of the biodegradable polyurethane elastomer by controlling the mass ratio and molecular weight of the three.

A method for catalyzing the thermal decomposition of polyβ-hydroxybutyrate using a metal catalyst. The present invention belongs to the technical field of chemical recovery of organic materials. The present invention addresses the technical problem that existing methods for thermal decomposition of discarded polyβ-hydroxybutyrate require harsh conditions and the use of toxic catalysts, and lack a green catalytic system and method that can quickly and efficiently thermally decompose polyβ-hydroxybutyrate under mild conditions. The present invention uses green and environmentally friendly metal zinc and magnesium catalysts to catalyze the thermal decomposition of polyβ-hydroxybutyrate. The catalyst is non-toxic and odorless, has little harm to the environment, and can avoid the harm to the ecological environment caused by the use of other toxic metal catalysts. At the same time, the catalytic system of the present invention has a high catalytic efficiency and can catalyze the rapid and efficient thermal decomposition of polyβ-hydroxybutyrate under mild conditions, thereby avoiding the increase in energy consumption caused by reaction conditions such as high temperature and high pressure. It is helpful to achieve green recycling of discarded polyβ-hydroxybutyrate plastics.

The invention provides a strain for producing polyhydroxybutyrate and application of the strain. The sequence of 16s rDNA of the strain is shown as any one of the following sequences: 1) a nucleotide sequence shown as SEQ ID NO: 1; 2) a nucleotide sequence obtained by modifying, substituting, deleting or adding one or more basic groups to the nucleotide sequence shown in 1); 3) a nucleotide sequence having at least 70% identity with 1), preferably a nucleotide sequence having at least 80% identity, preferably a nucleotide sequence having at least 85% identity, preferably a nucleotide sequence having at least 90% identity, preferably a nucleotide sequence having at least 95% identity, preferably a nucleotide sequence having at least 90% identity, preferably a nucleotide sequence having at least 90% identity, preferably a nucleotide sequence having at least 90% identity, preferably a nucleotide sequence having at least 90% identity, preferably a nucleotide sequence having at least 90% identity, preferably a nucleotide sequence having at least 90% identity and preferably a nucleotide sequence having at least 90% identity. The present invention relates to a nucleotide sequence having at least 97% identity, and more preferably, a nucleotide sequence having at least 99% identity. The strain is a Ralzonia bacterium, and the preservation number of the Ralzonia bacterium is CCTCC (China Center for Type Culture Collection) NO: M 20231548. The screened new strain capable of efficiently synthesizing the PHB by using the glycerol has PHB production potential, and fills the blank in the field of producing the PHB by using the strain by using the crude glycerol as a substrate.

Absorbable implants for breast surgery that conform to the breast parenchyma and surrounding chest wall have been developed. These implants support newly lifted breast parenchyma, and / or a breast implant. The implants have mechanical properties sufficient to support a reconstructed breast, and allow the in-growth of tissue into the implant as it degrades. The implants have a strength retention profile allowing the support of the breast to be transitioned from the implant to regenerated host tissue, without significant loss of support. Three-dimensional implants for use in minimally invasive mastopexy / breast reconstruction procedures are also described, that confer shape to a patient's breast. These implants are self-reinforced, can be temporarily deformed, implanted in a suitably dissected tissue plane, and resume their preformed three-dimensional shape. The implants are preferably made from poly-4-hydroxybutyrate (P4HB) and copolymers thereof. The implants have suture pullout strengths that can resist the mechanical loads exerted on the reconstructed breast.

The present invention provides a method for manufacturing an injection molded body from a molding material containing a poly(3-hydroxybutyrate)-based resin, the method comprising: heating and melting the molding material so that the temperature reaches between the melting point peak temperature and the end temperature of the melting point peak, and injecting the molding material into a mold having a temperature in the range of 30°C to 80°C; and cooling the molding material in the mold to crystallize and solidify the molding material, wherein the difference between the melting point peak temperature and the end temperature of the melting point peak in differential scanning calorimetry analysis of the molding material is 10°C or more and 70°C or less.

The invention relates to the technical field of compatilizers, and particularly discloses a P34HB-g-GMA compatilizer as well as a preparation method and application thereof. The P34HB-g-GMA compatilizer is prepared from the following preparation raw materials in percentage by mass: 88%-98% of poly (3-hydroxybutyrate-4-hydroxybutyrate), 0.02%-2% of an initiator, 1%-10% of glycidyl methacrylate, 0.1%-1% of an inhibitor, 0.1%-1% of a lubricant and 0.1%-1% of an auxiliary agent, wherein the sum of the mass percentages of the preparation raw materials is 100%. The P34HB-g-GMA, which is prepared by carrying out addition reaction on GMA serving as a grafting monomer and free radicals on a P34HB molecular chain, has the property of a compatilizer, and can be used for effectively improving the compatibility between PHA and other biological materials and improving the stability and the mechanical property of the composite material when being applied to a biodegradable composite material.

The present invention relates to a method for treatment of poly hydroxy alkanoate (PHA) containing post-consumer product, the method comprising contacting a post-consumer product with a polypeptide that can catalyze degradation of the PHA, the contact taking place at a temperature at least 40° C. and in the presence of salt at a concentration of 1 M or greater. In a specific embodiment, the polypeptide is a wild-type PHA depolymerase expressed by a halophilic microorganism or a modified PHA depolymerase that includes one or more single-site mutations as compared to the wild-type PHA depolymerase. In another specific embodiment, the polypeptide comprising a modified poly hydroxy butyrate (PHB) depolymerase comprising one or more single-site mutations as compared to SEQ ID NO: 1, and the modified PHB depolymerase having a solubility of 10 mg / L or greater. The present invention also relates to a host cell transformed to express a polypeptide that catalyzes degradation of a PHA in the presence of salt at a concentration of 1 M or greater, wherein the host cell is selected from an E. coli cell or a halophilic microorganism.

The application provides an ADR chain extender modified poly(-3-hydroxybutyrate-co-3-hydroxyhexanoate) and a preparation method and application thereof. The full-biological antibacterial film can be prepared by blending the ADR chain extender modified poly(-3-hydroxybutyrate-co-3-hydroxyhexanoate) polymer and the epoxy soybean oil modified starch. The epoxy soybean oil modified starch has a core-shell structure, the existence of the shell can prevent the starch from absorbing water, improve the water resistance of the full-biological antibacterial film, and prolong the shelf life. Meanwhile, after the poly(-3-hydroxybutyrate-co-3-hydroxyhexanoate) polymer is modified by the ADR chain extender, the molecular weight can be significantly increased, so that the tear resistance and tensile strength of the full-biological antibacterial film can be obviously improved, and the full-biological antibacterial film also has excellent antibacterial performance.

In a method for producing a stretched film by stretching a film web containing a poly(3-hydroxybutyrate) resin, the film web is stretched under conditions where a film surface maximum temperature is within a temperature range represented by the following inequality:Tm-60≤film surface maximum temperature (° C.)≤Tm-5, where the Tm is a melting point (° C.) of the film web.

The application relates to the technical field of biomaterials, and particularly discloses a PHA combined microsphere as well as a preparation method and application thereof. The PHA combined microsphere provided by the application contains 10-40 wt% of PHA microspheres with a weight average molecular weight of less than 30000 Da and 1-40 wt% of PHA microspheres with a weight average molecular weight of more than 100000 Da, with the PHA being selected from one or more of poly-beta-hydroxybutyric acid, a copolymer of 3-hydroxybutyric acid ester and 3-hydroxyvaleric acid ester, a copolyester of 3-hydroxybutyric acid and 3-hydroxyhexanoic acid and poly(3-hydroxybutyric acid-co-4-hydroxybutyric acid). After the PHA combined microsphere is filled in the skin, on one hand, the PHA combined microsphere can be rapidly degraded in an early stage and promote the reproduction of fibroblasts and endothelial cells in a short time; on the other hand, the PHA combined microsphere can be continuously degraded within 21 weeks and cannot cause inflammation, so that the effect of persistent filling is achieved.