120 results about "Polyhydroxybutyrate" patented technology

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 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.

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.

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.

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 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 invention discloses a high-performance polylactic acid biaxially oriented film, which is prepared by a two-step biaxially oriented process by polylactic acid, poly (3-hydroxybutyrate-co-3-hydroxyhexanoate), an epoxy compatibilizer and a processing aid; its raw materials include 80-95 parts of polylactic acid (PLA), 5-20 parts of poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH), 0.1-2 parts of epoxy compatibilizer, and 0.1-3 parts of processing aid; each raw material is measured in parts by mass. The present invention successfully solves one of the industrial problems of unstable film formation and poor toughness at a large ratio and low strength at a low ratio in the preparation process of polylactic acid biaxially oriented film. Finally, high-performance polylactic acid biaxially oriented film is successfully prepared under the synergistic effect of PHBH toughening PLA and two-step stretching process to improve the content of polylactic acid mesophase.

The present invention provides genetically modified Gram-positive bacteria that efficiently produce polyhydroxyalkanoates (PHAs). Also provided in the present description is a DNA molecule encoding enzymes necessary for the synthesis of PHAs. The invention further provides methods of producing PHAs comprising cultivating a genetically modified Gram-positive bacterium that produces polyhydroxyalkanoates (PHAs) efficiently and procedure for purification of PHA from a culture of a genetically modified Gram-positive bacterium that produces polyhydroxyalkanoates (PHAs).

Provided in the present invention is a poly(3-hydroxybutyrate) polymer derivative, having a structure as represented by formula (I), wherein A is phenyl or phenyl C1-C4 alkyl, optionally substituted with a substituent selected from hydroxyl, C1-C4 alkyl, and C2-C4 alkenyl, R is saturated C1-C4 alkyl or hydroxyl-substituted saturated C1-C4 alkyl, Z is a polymeric residue of a hydroxy C3-C10 alkanoic acid, x is an integer from 1 to 20, and y is an integer from 0 to 20. Compared with an unmodified 3-hydroxybutyrate polymer, the poly(3-hydroxybutyrate) polymer derivative provided by the present invention has a significantly improved aromatic odor while retaining excellent broad-spectrum antimicrobial / antiviral effects of a poly(3-hydroxybutyrate) polymer, can also degrade under natural conditions, and has no irritation to the skin.

To provide a method for producing a composition for thermal processing that contains a poly(3-hydroxyalkanoate)-based resin, the composition exhibiting favorable solidification property during thermal processing, allowing production with high productivity, and enabling reduction of poor mixing of resin components.SOLUTION: A composition for thermal processing is obtained by subjecting a raw material composition containing a poly(3-hydroxyalkanoate)-based resin to melting, followed by cooling and solidification. The raw material composition comprises a resin component (I) that, in differential scanning calorimetry, exhibits a melting point peak (i) with a peak temperature of 165°C or more, and a resin component (II) that does not exhibit the melting point peak (i), and the resin component (I) includes a melt-kneaded material derived from a poly(3-hydroxyalkanoate)-based copolymer (A) and poly(3-hydroxybutyrate) (B). The melting of the raw material composition is performed under a condition such that the maximum temperature of the raw material composition is at or below the end temperature of the melting point peak (i).SELECTED DRAWING: None

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.

The invention belongs to the technical field of compounds, and particularly relates to a preparation method of R-3-hydroxybutyric acid. The preparation method of the R-3-hydroxybutyric acid comprises the following steps: hydrolyzing poly-3-hydroxybutyrate, removing impurities, concentrating and dehydrating, extracting, carrying out suction filtration, adjusting acid, decolorizing, carrying out molecular distillation, and drying to obtain the R-3-hydroxybutyric acid. The R-3-hydroxybutyric acid obtained by the preparation method disclosed by the invention has the advantages of high purity, high content, short production period, low equipment requirement, low raw material cost and the like, is suitable for industrial production and has a good application prospect.

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.

In alternative embodiments, provided are methods for selecting, isolating and recombinantly engineering methane- and hydrogen-oxidizing autotrophs, including methanotrophic bacteria, for the production of biopolymer, renewable polymer or biodegradable polymer such as polyhydroxyalkanoate (PHA) such as polyhydroxybutyrate (PHB) and co-polymers, and products of manufacture and kits, and methods for using them to produce biopolymer, renewable polymer or biodegradable polymer. Provided and isolation are efficient methane-consuming methane- and hydrogen-oxidizing autotrophic microbes for PHA (for example, PHB and co-polymers) production and methods for using them, which in alternative embodiments the methanotrophs are genetically modified to improve C1 (methane or methanol)-to PHA conversion parameters.

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.

A biodegradable composite comprising: a biodegradable polymer of biodegradability of 80-95% measured according to a biodegradability test of ASTM D6400 – 19 standard, wherein the polymeric matrix of the biodegradable polymer may have a tensile strength of 30-45 MPa and an elastic modulus of 2600-3600 MPa; a bio-derived fiber with a tensile strength and an elastic modulus greater than that of the polymeric matrix, the fiber infused with a bio-derived wax to have a surface energy of 45-50 mJ / m2, the fiber with average diameter of 20-30 µm and average length of 15-20 mm. The preferred embodiment uses beeswax treated hemp fibers with poly-3-hydroxybutyrate-co-3- poly-3-hydroxyvalerate (PHBV). The composite can be formed into a container. A method of producing said composite comprises wetting the bio-derived fiber with a wax emulsion, infusing it, then fusing said wax infused bio-derived fiber with the biodegradable plastic. The composite may exhibit a water contact angle ≥ 90 degrees. The biodegradable plastic may be one of or a mix of poly-3-hydroxybutyrate (P3HB), poly-4-hydroxybutyrate (P4HB), poly-3-hydroxybutyrate-co-4-hydroxybutyrate (P3HB-co-4HB), poly-3-hydroxybutyrate-co-3- poly-3-hydroxyvalerate (PHBV), poly-3-hydroxybutyratehexanoate (PBHH), polylactic acid (PLA), thermoplastic starch (TPS), polycaprolactone (PCL), polybutylene succinate (PBS), polyglycolic acid (PGA), poly(lactic-co-glycolic acid) (PLGA), polybutylene adipate terephthalate (PBAT), polyvinyl alcohol (PVA).

The invention belongs to the technical field of catalysts, relates to spiro Salen ligands as well as a preparation method and application thereof, and particularly relates to application of the spiro Salen ligands to preparation of degradable polyhydroxyalkanoate by catalyzing ring-opening polymerization of beta-butyrolactone. According to the invention, spiro-o-hydroxyaldehyde and dialdehyde are designed and synthesized and are applied to preparation of spiro-Salen ligands, so that the variety of the Salen ligands is enriched, and the derivation application range of spiro-compounds is widened. The invention also relates to ring opening polymerization participated by the ligand. By adopting a catalytic system formed by the Salen ligand and a yttrium metal precursor, the high-activity and high-selectivity poly-3-hydroxybutyrate with a regular stereostructure can be obtained. The method has the advantages that the catalyst is low in dosage and high in activity, the poly-3-hydroxybutyrate product has high syndiotactic degree, the defect that only isotactic products can be obtained by a biological method can be effectively overcome, and the method has industrial application value.

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.