44results about How to "Guaranteed biodegradability" patented technology

The invention belongs to the technical field of composite materials, and relates to a polylactic acid composite material and a preparation method thereof. The polylactic acid composite material is prepared from the following components in percentage by weight: 5 to 90 percent of polylactic acid, 5 to 80 percent of biodegradable polyester and 5 to 80 percent of heat-resistant master batch. The heat-resistant high-toughness polylactic acid composite material is obtained by continuous in-situ reaction extrusion. The composite material simultaneously has the characteristics of high toughness, high temperature resistance, low production cost, full biodegadability and the like.

The invention discloses bio-based biodegradable multi-block copolymer as well as a preparation method and application thereof. The multi-block copolymer comprises a chain segment A and a chain segmentB; the chain segment A is fat-aromatic coplyester with number average molecular weight of 3000 to 100000, which is obtained by performing esterification (ester exchange) on C2-C36 fatty diacid and derivatives thereof, C6-C20 aromatic diacid and derivatives thereof, C2-C36 divalent alcohol, and 0.0 to 10% by weight of polyhydroxyl or polycarboxyl compound and performing condensation polymerization; the chain segment B is fatty copolyester with number average molecular weight of 3000 to 100000, which is obtained by performing esterification (ester exchange) on dimer acid and derivatives thereof, C2-C12 fatty diacid and derivatives thereof, C2-C36 divalent alcohol as well as 0.0 to 10% of polyhydroxyl or polycarboxyl compound and performing condensation polymerization. The chain segment A and the chain segment B react with a polyfunctional chain extender of polyisocyanate, a polyepoxy compound and carbodiimide which is 0.01 to 10% of the polymer to form the multi-block copolymer. The product prepared by the method has high biodegradability, mechanical property and processing property, and can be widely applied to the fields of packaging, biological medicine, medical treatment and thelike.

The invention discloses a preparation method of biodegradable regenerated polyester staple fibers, which is characterized by comprising the steps of drying spinning materials by a vacuum drum, mixing with biodegradable master batch dried by a master batch drying system at the feed inlet of a screw extruder; preparing primary fibers after mixing and fusing by the screw extruder and extruding by a spinneret plate; cooling primary fibers by an annular blowing device; successively carrying out winding, falling, bundling and time balancing on the primary fibers in a constant temperature and constant-humidity room; stretching the primary fibers in oil bath and stream respectively; performing curling, relaxation heat setting, cutting and packaging to obtain biodegradable regenerated polyester staple fibers, wherein physical properties and mechanical properties of the biodegradable regenerated polyester staple fibers produced by the method do not change, and therefore, the subsequent processing and usage are not influenced; after being used, the fibers can be decomposed into inert humus, carbon dioxide and water in a microorganism-enriching environments such as refuse landfill or composting site, thereby returning to nature and achieving real biodegradation.

The invention discloses a preparation method of nanometer strontium hydroxyapatite, which comprises the following steps: preparing a strontium nitrate aqueous solution and a diammonium phosphate aqueous solution with certain concentrations, adjusting the pH value of the strontium nitrate aqueous solution, mixing the strontium nitrate and the diammonium phosphate aqueous solutions to generate a nanometer strontium hydroxyapatite precipitate, standing and aging, filtering to remove the upper supernatant, washing and filtering the nanometer strontium hydroxyapatite precipitate to be neutral, performing centrifugal dewatering and freeze drying to finally obtain the nanometer strontium hydroxyapatite. When compared with nanometer hydroxyapatite, the nanometer strontium hydroxyapatite obtained in the preparation method has better biodegradability and better osteoinductivity; meanwhile, the preparation process avoids high temperature process, so the biodegradability is further ensured; The nanometer strontium hydroxyapatite obtained in the preparation method has good prospects in the application of bone repair materials.

The invention relates to a biodegradable bonding agent material prepared from LA (lactide) chemical synthesis products. The LA materials are poured into a reaction container containing solvents according to the proportion of 5 to 50 percent of the mass of the solvents; a reactor has a stirring and control function; the reactor is controlled under the nitrogen gas protection condition; a certain reaction temperature is controlled; meanwhile, the stirring is performed; after the LA is completely fused, catalysts are added; after reacting for a period of time, stirring is stopped; after the materials are taken out, extraction and centrifugation are performed, so that the LA chemical synthesis products are obtained; then, the LA chemical synthesis products are dissolved by acetic ester, so that the biodegradable bonding agent is obtained. The bonding agent has the characteristics that the preparation is simple; the relative molecular weight and the viscosity are controllable; the biodegradable performance is realized. The biodegradable bonding agent material can be used in the fields of adhesive tapes, leather, sticking paper, stationery, office, electronics, automobile edge trimming fixation, shoe industry, handwork ornament pasting and fixation and the like.

The invention discloses a cationization silk fibroin and a preparation method thereof, and belongs to the technical field of medical high-molecular materials. The cationization silk fibroin is obtained through reaction by coupling protamine sulfate mediated by water-soluble 2-imido thiacyclopentane hydrochloride with silk fibroin activated by sulfo-succinimido-4-[N-maleimide methyl]-cyclohexane-1-carboxylate. The cationization silk fibroin disclosed by the invention has the advantages of good biocompatibility and degradability, controllability in surface charge density, effective DNA (Deoxyribonucleic Acid) compression and protection capacity, higher transfection efficiency and uniqueness in cell targeting and cell nucleus positioning function. The cationization silk fibroin disclosed by the invention can form a cationization silk/gene compound with a gene substance through electrostatic action, and the cationization silk/gene compound is a novel biodegradable cationization silk gene transfer vector with cell targeting and a cell nucleus positioning function.

The invention relates to the technical field of organic silicon materials. In order to solve problems of heat resistance of the existing aliphatic polyester materials, the invention discloses a biodegradable material containing ladder-like polysilsesquioxane and a preparation method of the biodegradable material. The biodegradable material containing the ladder-like polysilsesquioxane is prepared by carrying out polymerization reaction on hydroxyl end-capped ladder-like polysilsesquioxane and aliphatic cyclic ester monomers in the presence of a catalyst. The method disclosed by the invention is used for preparing a biodegradable segmented copolymer by virtue of ring opening polymerization of aliphatic cyclic ester monomers, so that biodegradable performances of the materials are guaranteed, and heat resistance of the aliphatic polyester is improved.

The invention discloses a cationic silk fibroin/gene compound, and a preparation method and application thereof and belongs to the technical field of polymeric biomaterials. The cationic silk fibroin/gene compound, and the preparation method and application thereof are characterized in that a cationic silk gene transmission carrier which has cell targeting and cell nucleus positioning functions and can be biodegraded is established and is obtained through the following steps: protamine sulfate is mediated by a water-soluble 2-imino thiacyclopentane hydrochloride to be in coupled with and react with the silk fibroin activated by sulfo-succunyl imino group-4-[N-maleimide methyl]-cyclohexane-1-carboxylic ester; the combination and a gene matter form the cationic silk fibroin/ gene compound through electrostatic interaction. According to the invention, the cationic silk fibroin/gene compound has good biocompatibility and degradability, is controllable in surface charge density, can be effectively compressed and protect DNA, is relatively high in transfection efficiency, and has the particular cell targeting and cell nucleus positioning functions.

The invention discloses thermal response poly-(carbonate-ether) capable of being biologically degraded and a preparation method thereof. The method comprises a step of implementing co-polymerization reaction for carbon dioxide and ethylene oxide under a catalytic action of a composite catalyst of a duplex-metal-cyanide-rare-earth complex to obtain the poly-(carbonate-ether). Because the rare earth complex can accelerate the ring-opening reaction of the ethylene oxide, so that the method can adopt the composite catalyst of the duplex-metal-cyanide-rare-earth complex to accelerate the co-polymerization reaction, can ensure that the contents of the carbonic ester of the poly-(carbonate-ether) can be adjusted within 4% and 45%, and can ensure that the prepared poly-(carbonate-ether) has thermal response performance while being biologically degraded. The test result shows that the poly-(carbonate-ether) prepared by using the method has a thermal response behavior in water liquid and can be dissolved in water at low temperature. The polymer cannot be dissolved and separated out from water while the temperature is higher than the critical dissolving temperature. The transition temperature is 10 DEG C to 90 DEG C. Especially the poly-(carbonate-ether) has the thermal response behavior at 35 DEG C to 37 DEG C.

A slow-release epidoxorubicin-polylactic acid microball is prepared through dissolving epidoxorubicin hydrochloride in DMF, adding triethylamine, adding polylactic acid, adding water, dialyzing in water while stirring and exchanging water every 1-3 hr, centrifugal dewatering, ultrasonic treating, water washing, removing uncoated epidoxorubicin, and freeze-drying of deposit.

The invention provides an air-permeable and water-proof aquatic product fresh-keeping bag and a preparation method thereof. The aquatic product fresh-keeping bag has excellent air permeable and water-proof performance as well as good mechanical strength, resveratrol and antibacterial substances enable the fresh-keeping bag to have antibacterial performance, and it is guaranteed that bacteria failto breed in the fresh-keeping bag for a long time; calcium hydroxide can absorb water permeating the inside and the outside of the fresh-keeping bag, so that the fresh-keeping bag is made to have a water-proof function; porous packing can guarantee that the fresh-keeping bag has an air-permeable and water-proof function; and poly butylene succinate and polyglutamic acid enables the fresh-keeping bag to have a biodegradation function, pollution is reduced, and environment protection is facilitated. The air-permeable and water-proof aquatic product fresh-keeping bag is safe and innoxious, has noadverse influence on aquatic products and can be fully utilized, in addition, the aquatic products are not prone to rotting, the fresh-keeping bag is suitable for fresh-keeping of the aquatic products, and the fresh-keeping period of the aquatic products is prolonged.

The invention discloses an easily biodegradable water-soluble polyester and a preparation method thereof. According to the present invention, terephthalic acid, sodium bis(2-hydroxyethyl)isophthalate-5-sulfonate, ethylene glycol, 1, 4-butanediol, an aliphatic dibasic acid modified monomer and other components are subjected to copolymerization modification to successfully prepare the high BOD5/CODcr type water-soluble polyester with excellent biochemical degradability, meanwhile, an intermittent four-kettle process is adopted, a step-by-step polymerization process is realized, process parameters are optimized, a final product has the characteristics of easiness in sizing, easiness in desizing, high glass-transition temperature and the like, and the use requirements of efficient sizing and green desizing of polyester chemical fiber filaments, short fibers and polyester-nylon composite yarns are met.

The invention relates to a biodegradable adhesive material prepared by using a chemical degradation product of a polyhydroxyalkanoate (PHA) alkali liquor and belongs to the field of adhesives. The method comprises the steps of firstly pouring a PHA material into a reaction container with an alkali solution at the ratio of 5-30% of the mass of the alkali solution, wherein a reactor has stirring and temperature control functions; controlling the reactor at a certain reaction temperature while stirring, stopping stirring after reacting for a period of time and obtaining a PHA alkaline chemical degradation product; and diluting the PHA alkaline chemical degradation product by using distilled water to obtain the biodegradable adhesive. The adhesive is a water-soluble adhesive, has the characteristics of being simple in preparation, controllable in relative molecular weight and viscosity and biodegradable, can be applied to the fields of adhesive tape, leather, sticker, stationery, office, electrons and automotive trim fixation, footwear industry and handmade jewelry pasting and fixation.

The invention discloses a biodegradable heat shrink film and a processing technology thereof, and relates to the technical field of heat shrink films. The biodegradable heat shrink film is prepared from the following raw materials by weight: 100 parts of modified polylactic acid, 0.5-5 parts of an anti-static agent, 0.5-5 parts of a lubricant, 0.5-5 parts of an antioxidant, and 0.5-5 parts of a light stabilizer. The polylactic acid is used as a processing raw material of the heat shrink film, and the green and environment-friendly heat shrink film is prepared by using the excellent biodegradability of the polylactic acid, so that the problem of environmental pollution caused by discarding of a conventional heat shrink film is relieved.