62 results about "Poly-3-hydroxybutyrate" patented technology

Methods are provided for producing biodegradable polyhydroxyalkanoates (PHAs) with desired geometry, molecular mass, mechanical and/or physical-chemical properties from glycerol, an inexpensive carbon source and byproduct of the biodiesel industry. Microorganisms capable of converting carbon to PHA can be used to convert biodiesel-glycerol to poly-3-hydroxybutyrate (PHB) or other monomer or copolymer PHAs via fermentation. The microorganisms are cultured in a medium comprising glycerol as a primary carbon source and one or more low molecular mass organic acids as a secondary carbon source. Biomass can be harvested from the culture medium and crude PHA extracted and purified, thereby recovering purified PHA with the desired property. After PHA isolation, a nucleating agent can be added to improve certain physical-chemical properties of the PHA; e.g., crystallization temperature, to enhance performance of the PHA during injection molding.

The present invention discloses a resin composition having excellent impact resistance and heat resistance, which comprises poly-3-hydroxybutyrate and core-shell latex rubber or specific thermoplastic polyurethane, the core-shell latex rubber Contains acrylic rubber and/or silicone-acrylic rubber copolymer as core component and polymethyl methacrylate as shell component. The resin composition meets the following requirements (c) and (d): (c) when heated from room temperature to 180° C. at a rate of 80° C./min by a differential scanning calorimeter, kept at 180° C. for 1 minute, and then When cooled at a cooling rate of 10°C/min, the crystallization temperature is 110 to 170°C; and (d) when the chloroform-soluble content is measured by gel permeation chromatography, the weight average molecular weight (Mw) in terms of polystyrene is 100,000 -3,000,000.

The invention discloses a functional PET technology, and particularly relates to a poly 3-hydroxybutyrate-3-hydroxyvalerate and poly lactic acid blending modification polyester filament and a preparation method thereof. The invention aims at overcoming the defects in the prior art and providing a PLA (Poly Lactic Acid) and PHBV (Poly Hydroxyl Butyrate Valerate) blending modification polyester filament which is quick in degradation velocity, high in softness, good in handfeel, and easy to color and a preparation method thereof. The polyester filament consists of 20-50wt% of PLA and the balance of PHBV, can satisfy the existing pursue of people, and has the characteristics that under the condition that the quality of cloth is met, abundant colors can be selected by people, so that the more choices are provided.

The invention discloses a high polymer-based cigarette filter material with an excellent temperature control effect and a preparation method thereof. The high polymer-based cigarette filter material is obtained by using a high polymer material with excellent biodegradability as a base material and adding a microcapsule phase change material and nano particles with high heat conductivity coefficients, wherein the high polymer material is one or more of polycaprolactone, polyhydroxyalkanoate, poly 3-hydroxybutyrate, a polyglycolide polymer material; and the microcapsule phase change materials ismicroencapsulated polyethylene glycol, the polyethylene glycol is used as a core material, and polyacrylonitrile is used as a wall material. The preparation method can be used for preparing a multi-component high polymer-based composite material which is cheap, safe, harmless and suitable for cigarette filters, and has the relatively high latent heat of phase change and heat transfer capability.The high polymer-based cigarette filter material with the excellent temperature control effect can be used as a novel cigarette filter to effectively reduce the mainstream smoke of cigarettes, and hasthe characteristics of low addition amount, obvious cooling effect, and significant reduction of harmful substances in smoke.

The invention belongs to the technical field of genetic engineering and fermentation, and particularly discloses an engineering bacterium for producing 3-hydroxybutyric acid and 4-hydroxybutyric acid copolyester (P3HB4HB) by utilizing a sugar carbon source. Exogenous genes needed for combining the P2HB4HB are recombined and integrated on the genome of the engineering bacterium and comprise poly-3-hydroxybutyrate synthetic gene phaCAB and 4-hydroxybutyryl coenzyme A which is transferase gene orfZ, 4-hydroxybutyric acid dehydrogenase gene 4hbD and 2-oxoglutarate dehydrogenase gene kgd. By utilization of the engineering bacterium, the P3HB4HB can be produced by using the sugar carbon source with relatively cheap price, the production cost is effectively reduced, and the large-scale industrial production and the commercial application and development are pushed.

The invention discloses an anti-bacterial and acid-alkali-resistant medical material and a preparation method thereof. The medical material is prepared from main ingredients including pharmaceutical grade polyvinyl alcohol, polypropylene resin, poly-3-hydroxybutyrate and polyethylene glycol fatty acid ester mixed with pentaerythritol oleate, octenyl succinic acid modified starch, citrate, N-butylcyanoacrylate, sulfanilamide, sodium citrate, polyactic acid fibers, aluminium silicate ceramic fibers, magnesium carbonate, gaseous-phase white carbon black, malic acid, a dispersing agent and a stabilizer by mixing, stirring, high-temperature sintering, grinding, high-pressure calcination, acid leaching, ultrasonic dispersion, screw extrusion, injection molding treatment and the like. The anti-bacterial and acid-alkali-resistant medical material has an excellent anti-bacterial property and acid and alkali resistance, can meet requirements of the industry and has better application prospect.

The invention discloses a PHBV (polyhydroxylbutyrate valerate) polymer, a preparation method and a hemostatic material manufactured by using the PHBV polymer. The PHBV polymer is a copolymer of 3-hydroxybutyrate (3HB) and 3-hydroxyvalerate (3HV), and the main chain of the polymer includes at least 50 blocks of poly 3-hydroxybutyrate and at least 50 blocks of poly 3-hydroxyvalerate. The preparation method comprises: inoculating Haloferax mediterranei ES1 strains to a fermentation medium, and automatically feeding 2M hydrochloric acid solution or 2M sodium hydroxide solution under the condition that the fermentation temperature is 37 DEG C, the stirring revolution speed is 300-500r/min and the ventilatory capacity is 1.25: 1vvm to stabilize the pH value at 6.9-7.1; fermenting for 36-48h under the condition that the ventilatory capacity is 1.25: 1vvm and the inner pressure of a tank body is 1 atmosphere; and extracting the PHBV polymer from the fermentation solution.

The invention provides a method of using poly-3-hydroxybutyrate to prepare a liquid fuel; method comprises: adding the catalyst aluminum dihydrogen phosphate and poly-3-hydroxybutyrate into a high-temperature high-pressure reactor, reacting at 210-270 DEG C for 3-12 hours to obtain the liquid fuel. Aluminum dihydrogen phosphate is used as a catalyst herein, poly-3-hydroxybutyrate may be further catalytically converted at the mild temperature (210-270 DEG C) to prepare an oil product; the technical process of the method is simple and convenient to perform, and the method has industrial application prospect; the yield of oil the product is up to 36.9% by weight, the contents of carbon and hydrogen in the oil product are up to 84.5% by weight and 11.5% by weight respectively, and caloric value is up to 42 MJ/kg, which is equal to that of conventional commercial oxygen-bearing gasoline; under catalysis of the aluminum dihydrogen phosphate, the poly-3-hydroxybutyrate is converted into hydrocarbons mainly in decarboxylation form, and the decarboxylation rate is up to 73%.

The invention belongs to the field of packaging materials, and relates to a polymeric membrane material for packaging and a preparation method thereof. The polymeric membrane material is prepared from the following constituents: 35-60 parts of polypropylene, 4-10 parts of polycaprolactone, 5-16 parts of polytrimethylene terephthalate, 3-9 parts of poly(butylene succinate), 2-5 parts of dioctyl terephthalate, 0.5-1.5 parts of tributyl phosphate, 4-8 parts of polyethylene glycol acrylate, 2-6 parts of poly-3-hydroxybutyrate, and 0.5-1.2 parts of diethyl phthalate. The preparation method comprises the following steps: (1) starting a high-speed mixer, and sequentially feeding the raw materials into a high-speed mixer to be mixed; (2) using a twin-screw extruder to squeeze the mixed membrane materials at high temperature; (3) using a high-temperature casting machine to cast the mixed materials squeezed by the twin-screw extruder to form a membrane; (4) cooling the packaging membrane material cast by the casting machine, so as to obtain the polymeric membrane material for packaging.

The invention discloses a PE (Poly Ethylene) heat shrink film and a preparation method thereof, and relates to the field of packing materials. The PE heat shrink film is prepared from the following raw materials in parts by weight: 40-60 parts of ethylene-ethylene vinyl acetate copolymer, 50-60 parts of poly-3-hydroxybutyrate, 60-70 parts of high density polyethylene, 40-50 parts of linear low density polyethylene, 1-2 parts of antioxygen, 1-3 parts of heat stabilizer, 1-5 parts of fire retardant, 1-3 parts of lubricating agent, 1-3 parts of antiblocking agent and 2-4 parts of plasticizer. Since the raw materials mutually cooperate and act, the prepared PE heat shrink film has various excellent properties, high impact resistance and tear resistance and good transparency and surface glossiness, is easy to degrade and does not pollute environment. The preparation method is simple and easy in operation, and can realize large-scale production.

The invention relates to the field of packaging materials, particularly to a PE heat shrinkable film and a preparation method thereof, wherein the PE heat shrinkable film is prepared from the following raw materials by weight: 40-60 parts of an ethylene-vinyl acetate copolymer, 50-60 parts of poly-3 hydroxybutyrate, 60-70 parts of high-density polyethylene, 40-50 parts of linear low-density polyethylene, 1-2 parts of an antioxidant, 1-3 parts of a heat stabilizer, 1-5 parts of a flame retardant, 1-3 parts of a lubricant, 1-3 parts of an opening agent, 2-4 parts of a plasticizer, and 5-10 partsof modified kaolin powder. According to the present invention, the tensile strength of the PE heat shrinkable film prepared based on the technical scheme is improved to a certain extent; and by modifying the kaolin with cetyltrimethoxysilane, the modified kaolin can be uniformly dispersed into the polyethylene matrix so as to increase the impact resistance and the toughness of the PE heat shrinkable film and improve the processing rheology of the PE heat shrinkable film.

The invention discloses a poly-3-hydroxybutyrate composite material and a preparation method thereof. The poly-3-hydroxybutyrate composite material is prepared from the raw materials in parts by weight: 100 parts of poly-3-hydroxybutyrate copolymer and 10-40 parts of stereo-composite polylactic acid, wherein the stereo-composite polylactic acid is prepared from 30-70 parts of polylevolactic acid and 30-70 parts of polyparalactic acid. Through blending the stereo-composite polylactic acid and poly-3-hydroxybutyrate, the mechanical properties of pure poly-3-hydroxybutyrate resin are enhanced. According to the poly-3-hydroxybutyrate composite material and the preparation method thereof, the raw materials are readily available, and the process is simple; by adopting a two-step melting and blending method, the introduction of non-degradable materials such as a chain extender is avoided, and other non-degradable substances are not introduced while the mechanical properties of the pure poly-3-hydroxybutyrate resin are enhanced, so that the formed poly-3-hydroxybutyrate composite material has excellent biodegradability.

The invention relates to a method for preparing crotonic acid through catalytic conversion of poly-3-hydroxybutyrate by using a solid catalyst. The method comprises the following steps: poly-3-hydroxybutyrate, the solid catalyst and a gamma valerolactone solvent are mixed, and stirred and react for 1 to 24 hours at 120 to 180 DEG C to obtain crotonic acid; wherein the solid catalyst is one or moreof a solid acid catalyst or a solid base catalyst. The invention takes stable and high boiling point gamma valerolactone as solvent, solid acids and solid bases which are easy to separate and recoverand reusable are used as catalysts, so as to convert environmentally friendly and renewable poly-3-hydroxybutyrate into crotonic acid, and that yield of crotonic acid is as high as 85%, which has theprospect of industrialization. In addition, gamma valerolactone is used as the reaction solvent and has high stability and negligible loss in the preparation of crotonic acid. The separation and recovery process of solid catalyst after reaction is simple and has good reusability.

The invention provides a method for preparing 3-aminobutyric acid by using poly-3-hydroxybutyrate, and the method comprises the following steps: (1) adding the poly-3-hydroxybutyrate and ammonia waterinto a reaction container, and sealing the reaction container; and (2) opening a stirrer, heating the reaction container, and after the reaction is finished, cooling to room temperature to obtain the3-aminobutyric acid. The method disclosed by the invention is used for preparing the 3-aminobutyric acid by using the poly-3-hydroxybutyrate, the mass yield of the obtained 3-aminobutyric acid is 120% based on the content of the poly-3-hydroxybutyrate, namely, the yield reaches 100% of the theoretical yield. The adopted process is very simple, the reaction raw materials are the poly-3-hydroxybutyrate and the ammonia water, no catalyst or other additives are needed, the selectivity of the 3-aminobutyric acid can reach 100%, and the method has an industrial prospect.

The invention discloses an engineering bacterium containing an NADH (nicotinamide adenine dinucleotide) kinase gene and an application thereof. The invention provides a method for constructing a recombinant bacterium. The method is characterized by guiding an NADH kinase coding gene pos5 and a PHB (poly-beta-hydroxybutyrate) synthetic gene phbCAB into a target bacterium to obtain the recombinant bacterium. Experiments prove that the NADH kinase gene in the recombinant bacterium can promote transformation of NADH in cells to NADPH (nicotinamide adenine dinucleotide phosphate), thus improving synthesis of NADPH-dependent poly-3-hydroxybutyrate. Compared with former strains, the engineering bacterium has higher PHB production efficiency.

The invention discloses a method for increasing microbe intracellular inclusion accumulation amount by increasing bacteria volume. The method can increase the accumulation amount of a microbe intracellular inclusion, which is characterized in that microbe volume is increased by reforming the gene which can influence the microbe volume, and the accumulation amount of the microbe intracellular inclusion can be increased. The experiment proves that the method can construct engineering bacteria for increasing the bacteria volume, so that output of poly(3-hydroxybutyrate)(PHB), protein, polyphosphoric acid and carboxysome can be increased, and the some engineering bacteria poly(3-hydroxybutyrate)(PHB) can reach as high as 80% of dry cell weight which is increased by 30%. According to the invention, production process is simple, cost is low, and application prospect is wide.

The invention discloses a biodegradable wire used for fused deposition molding and a preparation method thereof. The wire is prepared from 100 parts of poly 3-hydroxybutyrate-co-3-methyl-3-hydroxyvalerate copolymer (the number average molecular weight is 5-150 thousand), 10-25 parts of plasticizer, 10-15 parts of chaotropic agent, 0.1-1 part of antioxidant, 0.1-8 parts of filler and auxiliaries, wherein the molar ratio of a 3-methyl-3-hydroxyvalerate chain segment in a copolymer is 20-35%, the plasticizer refers to one or a mixture of triethyl citrate, acetyl tributyl citrate, pentaerythritol and bisphenol A, and the chaotropic agent refers to one or a mixture of polyvinyl alcohol and polyethylene glycol. After the chaotropic agent and the plasticizer are added, the biodegradable wire can be removed completely in a very short period of time, the chaotropic agent a has certain plasticization effect on the biodegradable wire, and through the synergistic effect of the plasticizer and the chaotropic agent, the processability and mechanical properties of the biodegradable wire can be further improved.

The invention discloses a preparation method of oil-absorbing paper for facial care, comprising: step (1) preparing an organic phase of a mixed solution of polylactic acid and poly-3-hydroxybutyrate caproate; step (2) dissolving ammonium bicarbonate in In water, prepare the water phase; step (3) divide the organic phase into 4 to 7 parts, add them to the water phase one by one, and perform homogenization treatment after each part of the organic phase is added, and the time for each homogenization treatment is 12 to 25 minutes , and the rotation speed of the homogenization treatment increases successively, the rotation speed of the first homogenization treatment is 300 rpm, and the rotation speed of each subsequent homogenization treatment is increased by 100-130 rpm compared with the previous homogenization treatment, and the obtained For the emulsion, the volume ratio of the total amount of the organic phase to the water phase is 6-8:1; step (4) place the emulsion at room temperature for 1-2 hours; step (5) place it at -10--15°C to freeze Dry for 3 to 4 hours. The oil-absorbing paper prepared by the invention has good oil-absorbing capacity.