80 results about "Polyhydroxybutyrate" patented technology

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.

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 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 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.

The present disclosure relates to fiber and a method to obtain a fiber / filament comprising lignin, the method comprising the following steps: mixing 60-90 % (v / v) of lignin with a 10 to 40%(v / v) of solvent to obtain a lignin solution; providing polymer pellets; coating the polymer pellets by spraying the lignin solution; drying coated polymer pellets for removing the solvent through evaporation; placing the dried coated pellets into a melt-spinning equipment to obtain the fiber / filament. It also relates a fiber comprising: 70 to 95% (w / w) of a polymer selected from a list consisting of polylactic acid, polyhydroxyalkanoates, polyhydroxybutyrate, polycaprolactone or their mixtures; and 5 to 30% (w / w) of lignin.

Provided is a method for producing a stretched film containing a poly(3-hydroxybutyrate) resin which exhibits less shrinkage on heating, including melting a film raw material containing the poly(3-hydroxybutyrate) resin with an extruder and molding the film raw material into a film shape; stretching the molded film in a specific direction; and heating the stretched film to a temperature in a range from (melting point of the poly(3-hydroxybutyrate) resin−40)° C. to (melting point of the poly(3-hydroxybutyrate) resin)° C. by a non-contact heating technique with a relaxation amount in the specific direction represented by the formula (i) of 9 to 50%, (i) Relaxation amount [%]={(film dimension in specific direction before heat treatment)−(film dimension in specific direction during heat treatment)} / (film dimension in specific direction before heat treatment)×100.

The present specification generally relates to aqueous based compositions of poly hydroxyalkanoate (PHA) and polymer blends of PHA for use with food contact items and similar packaging films. In particular, the invention pertains to a composition and an article of manufacture having a coating or laminate made up of poly(3-hydroxybutyrate) homopolymer (PHB) having a final coating thickness in the range of 0.1 to 2.0 mil thickness dry weight, or in a weight basis of about 3 to 70 grams per square meter coat weight basis. Methods of making the compositions of the invention are also described. The invention also includes articles and films comprising the compositions.

The present application relates to the technical field of stretch film, and particularly relates to a stretch film for medical accessories and a preparation method thereof.The stretch film for medical accessories comprises a middle layer, an upper surface layer covering one side of the middle layer, and a lower surface layer covering the other side of the middle layer; the raw materials of the upper surface layer comprise, by mass fraction, polylactic acid 60-100, polybutylene adipate terephthalate 10-20, activated graphene 5-10, functional master batch 2-8, and a compatibilizer 1-2; the raw materials of the middle layer comprise, by mass fraction, polyhydroxybutyrate 40-60, branched starch 20-40, amino-terminated polyamide amine 1-2, and a compatibilizer 1-2; and the raw materials of the lower surface layer comprise, by mass fraction, polylactic acid 60-100, polybutylene succinate 10-20, activated graphene 5-15, functional master batch 1-10, and a compatibilizer 1-2.The present application can be degraded under natural conditions, has more excellent barrier properties, and has good mechanical properties.

A nanoyarn, comprising poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHX), (i) the nanoyarn being essentially free of a core material, (ii) the nanoyarn being essentially free of a co-polymer, or both (i) and (ii). An article, the article comprising a nanoyarn according to the present disclosure. A method, comprising forming a nanoyarn according to the present disclosure.

An object of an embodiment of the present invention is to provide a biodegradable polyester solution that exhibits good solubility in a halogen-free organic solvent and that has sufficient adhesive strength even when aged for a short time. The object is achieved by providing a biodegradable polyester solution containing a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer and a solvent, the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer having an average content of 16 mol % or more 3-hydroxyhexanoate.

This application relates to the field of film packaging technology, and particularly to a high-toughness biaxially oriented polyglycolic acid (PGA) film and its preparation method. The film has a three-layer structure: the upper and lower surface layers comprise an anti-sticking masterbatch and a PGA composite resin, and the core layer comprises a PGA composite resin. The composite resin comprises PGA, a PGA toughening agent, a hydroxyl fatty acid ester, a chain extender, and an antioxidant. The PGA toughening agent is a copolymer polymerized from ε-caprolactone, glycolide, succinic acid, and butanediol, and the hydroxyl fatty acid ester is poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) with a 3-hydroxyhexanoate unit molar content ≥25%. This application achieves synergistic toughening through the toughening agent and PGA, combined with the chain extender and antioxidant, significantly improving film toughness and processing stability while ensuring high barrier properties, high transparency, and high strength, making it suitable for high-requirement packaging applications.

The application discloses cupriavidus capable of producing polyhydroxyalkanoate by using various carbon sources such as ethanol and application thereof. Cupriavidus The strain sp.ZWJ01 has a preservation number of CGMCC No.37462 in the China General Microbiological Culture Collection Center. The strain can grow and accumulate poly-3-hydroxybutyric acid ester by using various substances such as ethanol, volatile fatty acid and sugar as carbon sources; can grow by using mixed carbon sources of ethanol+propionic acid or ethanol+valeric acid and accumulate poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid ester) in cells; and can grow by using mixed carbon sources of ethanol+gamma-butyrolactone or ethanol+1,4-butanediol and accumulate poly(3-hydroxybutyric acid-co-4-hydroxybutyric acid) in cells, and has a good application prospect.

The application discloses a kind of visible light switch polymorphic fluorescence biodegradable polymer film preparation and anti-fake application, with Hydrazone18, NSP22, polyhydroxybutyrate and plasticizer as raw material, by solution blending and solvent evaporation method preparation visible light switch polymorphic fluorescence biodegradable polymer.The initial state of the polymer presents red fluorescence, first by visible light 1 (525 nanometer) irradiation changes into green fluorescence, then by visible light 2 (450 nanometer) irradiation changes into no fluorescence state, finally restores to initial red fluorescence under heating condition.The polymer can realize reversible conversion between multiple fluorescence states under visible light and heat stimulation, and exhibits excellent light switch cycle and thermal reversibility.In addition, through molecular modification, biologically derived raw materials, etc., the polymer is biodegradable.The preparation process of the application is simple, and the obtained polymer has great application prospect in the fields of visible light driven multi-level encryption, biodegradable anti-fake label and intelligent fluorescent material.

Provided is a method for production a stretched film comprising a poly(3-hydroxybutyrate) resin and exhibiting less shrinkage on heating, comprising melting a film raw material containing the poly(3-hydroxybutyrate) resin with an extruder and molding the film raw material into a film shape; stretching the molded film; and subjecting the stretched film to a heat treatment that includes bringing the film to a temperature T1 and then to a temperature T2, and the temperatures T1 and T2 satisfy the conditions of the formulas (1) to (3):(Melting⁢ point⁢ of⁢ poly⁡(3-hydroxybutyrate)⁢resin-70)⁢°⁢ C.≤T⁢1 (1)T⁢2≤(melting⁢ point⁢ of⁢ poly⁡(3-hydroxybutyrate)⁢resin-20)⁢°⁢ C.(2)T⁢1≠T⁢2⁢ and⁢ T⁢1<T⁢2.(3)

Described are a process for the synthesis of poly-4-hydroxybutyrate, the use of a kit comprising (i) one or more bases comprising an alkaline metal cation and (ii) one or more alcohols in said process and to poly-4-hydroxybutyrate obtainable by said process.

The application discloses Halomonas for producing PHA by using CO2 electrochemical derivatives, a construction method and application of the Halomonas, and the Halomonas expresses Rhs644 genes and Rhs647 genes from Halomonas sp.TD01. The application realizes production of poly-3-hydroxybutyrate by using CO2 electrochemical derivatives as a single carbon source in the Halomonas, without additional adding of antibiotics and inducers, greatly reduces production cost, and improves single batch fermentation income. Meanwhile, efficient utilization of a cheap carbon source is realized, and the process of low-carbon biological manufacturing can be promoted. The poly-3-hydroxybutyrate is produced by using the application, and the time period is short, the production process is simple, the environment is green and pollution-free, and the application is beneficial to industrialized large-scale production.

The present invention relates to a biodegradable seed coating composition and a process to enhance seed protection, growth promotion, sustainability, and environmental compatibility. The composition comprises Polyhydroxybutyrate-co-valerate (PHBV), a natural antimicrobial agent like chitosan, plant-derived growth promoters such as aloe vera extract, a micronutrient complex, additives and a carrier such as purified water. The process for manufacturing the coating ensures precise integration of components under controlled conditions, maintaining temperatures below 70° C. The resulting coated seed product offers a shelf life of 5-7 years, germination rates above 90%, and moisture stability within ±2%.

A bioreactor and process are disclosed for forming polyhydroxybutyrate directly from depolymerized polyhydroxybutyrate. In two bioreactor vessels, a microorganism product, such as one or more enzymes, are combined with the polyhydroxybutyrate-containing post-consumer product materials. The microorganism can naturally secrete the one or more enzymes or can be genetically modified to secrete the enzyme. The combination of enzymes is designed to facilitate a metabolic pathway that can depolymerize PHB, convert the resulting hydroxybutyrate to hydroxybutyryl-CoA, and in turn polymerize it into PHB. Namely, a solution for the recycling of polyhydroxybutyrate to hydroxybutyrate and back to polyhydroxybutyrate.

This invention provides a laminate comprising a substrate layer, a gas barrier layer, and a sealant layer. The sealant layer is located on the outermost surface of one side of the laminate. The sealant layer is a resin layer comprising poly(3-hydroxybutyrate-copolymer-3-hydroxyhexanoate) and has at least one peak temperature (Tma) in the range of 130°C to 160°C in a crystallization melting curve obtained by differential scanning calorimetry.

This invention discloses a food-grade, medical-grade, photocatalytic, antibacterial, and bio-based fully degradable composite material and its preparation method. The composite material comprises a bio-based, fully degradable polymer matrix and an antibacterial masterbatch dispersed within the matrix. The bio-based, fully degradable polymer matrix contains at least two of polylactic acid, poly(butylene adipate / terephthalate), and poly(3-hydroxybutyrate-co-3-hydroxyvalerate). The antibacterial masterbatch uses core-shell structured microparticles as a carrier. These microparticles include a silver-doped nano-titanium oxide core and an alginate cross-linked shell coating the core. The core surface is also provided with a phytic acid or tannic acid biomimetic passivation layer. Through the TiO2@calcium alginate core-shell confinement + phytic acid biomimetic passivation design, the effect of 100% antibacterial rate in the dark for 2 minutes and a kill log value >5.00 for 5 minutes of 0.57% TiO2 suspension is transferred to solid film / product scenarios, solving the problem of compliance issues in food contact with existing high-load TiO2 bio-based materials.

A poly(3-hydroxyalkanoate) resin composition for molding contains a poly(3-hydroxyalkanoate) copolymer (A) having a weight-average molecular weight of 10×104 to 100×104 and a poly(3-hydroxybutyrate) resin (C) having a weight-average molecular weight of 16×104 to 50×104. The amount of the resin (C) is from more than 5 to 50 parts by weight per 100 parts by weight of the copolymer (A).

The invention belongs to the field of packaging bag preparation, and particularly relates to a degradable bamboo fiber express packaging bag. The express packaging bag is prepared from the following raw materials: low-density polyethylene, high-density polyethylene, butyl stearate, modified bamboo fiber powder, epoxidized soybean oil, polyhydroxybutyrate, modified filler, a polyethylene maleic anhydride copolymer, methoxytrimethylsilane, polyvinylidene fluoride, polybutadiene rubber and polyvinyl butyral. The express packaging bag prepared in the invention has excellent tensile strength and wear resistance on the premise of good degradation performance, and can be applied to the field of express packaging bags.

The invention discloses a polyhydroxyalkanoate composition and application thereof. The invention relates to a polyhydroxyalkanoate composition. The polyhydroxyalkanoate composition is prepared from the following raw materials: a polyhydroxyalkanoate polymer, polypropylene carbonate-phthalate and a processing aid, wherein the polyhydroxyalkanoate polymer is selected from one or a combination of more of poly (3-hydroxybutyrate), (3-hydroxybutyrate-co-4-hydroxybutyrate) copolymer, (3-hydroxybutyrate-co-3-hydroxyvalerate) copolymer and (3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer, and the polyhydroxyalkanoate polymer is selected from one or a combination of more of poly (3-hydroxybutyrate), (3-hydroxybutyrate-co-4-hydroxybutyrate) copolymer and (3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer. The weight percentage of the processing aid in the raw materials is 4-15%, and the processing aid comprises a nucleating agent, a melt flow regulator, an antioxidant, a release agent and an anti-hydrolysis agent. The polyhydroxyalkanoate composition has better processability and is easy to degrade.

To provide a coated paper having good heat sealability.SOLUTION: The coated paper has a coating layer containing PHBH (poly (3-hydroxybutyrate-co-3-hydroxyhexanoate)) and EVA (ethylene-vinyl acetate copolymer resin) on at least one surface of a paper base material and a second coating layer containing PHBH on the coating layer.SELECTED DRAWING: None