81results about How to "Remain biodegradable" patented technology

The invention discloses a preparation method of antibacterial silver/chitosan nano fibrous membranes, pertaining to the preparative technologies of nano composite fibrous membranes. The process of the method includes that a chitosan hexanoic acid solution, a silver nitrate aqoeous solution, a sodium borohydride water solution and an ethylene epoxide hexanoic acid solution are prepared and mixed to form compounded latex according to the volume ratios of the chitosan hexanoic acid solution and the silver nitrate aqoeous solution as well as an NaBH4 aqueous solution. The compounded latex and the ethylene epoxide hexanoic acid solution are mixed according to the volume ration to prepare a spinning solution, then the spinning solution is added into an injector in an electrostatic spinning device and electrostatic spinning is carried out to form the fibrous membrane. Crosslinking treatment is carried out to the fibrous membrane to obtain the antibacterial silver/chitosan nano fibrous membrane. The antibacterial silver/chitosan nano fibrous membrane of the invention has the advantages that the preparation process is simple; the prepared membrane material has broad-spectrum bactericidal property and comparatively high fatality rate to Bacillus coli, Bacillus subtilis, Staphylococcus aureus and Pseudomonas aeruginosa for 24 hours.

The present invention discloses a biodegradable aliphatic polyester / aromatic polyester multi-block copolymer and preparation method and application thereof. The copolymer is a AB-type multi-block copolymer composed of A chain segment and B chain segment; the number average molecular weight of the copolymer is 5,000-500,000, and the molecular weight distribution is 1-5; in the copolymer, the A chain segment is prepared by reacting C2-C12 aliphatic dibasic acids or esters, acyl chlorides, and anhydrides thereof with C2-C12 aliphatic diols; the B chain segment is prepared by reacting 1,2-propylene glycol with C8-C14 aromatic or alicyclic dibasic acids or esters, acyl chlorides, and anhydrides thereof. The present invention introduces rigid amorphous polyester chain segments into crystalline aliphatic polyesters to obtain a biodegradable aliphatic polyester / aromatic polyester multi-block copolymer, which maintains the biodegradability and at the same time improves the mechanical properties of aliphatic polyesters. In addition, the copolymer can be used as an environment friendly polymer material and an anti-impact modifier for biodegradable polymer materials such as poly(butylene succinate), polylactic acid, polyhydroxybutyrate, etc., and has high application value.

The invention discloses a filling masterbatch used in biodegradable plastic. The masterbatch is composed of components of, by mass: (A) 20.0-80.0% of biodegradable polyester, (B) 1.0-80.0% of a filling material, (C) 0.1-10.0% of a lubricating agent, (D) 0.1-5.0% of a high-temperature-resistant agent, and (E) 0.1-5.0% of a hydrolysis-resisting agent. The masterbatch is advantaged in that: (1) compatibility of the carrier is consistent with that of the biodegradable plastic, such that the filling masterbatch has excellent dispersity in the biodegradable plastic; (2) the obtained filling masterbatch satisfies an application requirement of biodegradable plastic En13432; when the filling masterbatch is mixed with biodegradable plastic, the biodegradation performance of the original material is completely maintained; (3) high temperature and hydrolysis resistances of the filling masterbatch are good, and the filling masterbatch has high physical mechanical properties; (4) with the filling masterbatch, while the cost of biodegradable plastic is reduced, physical chemical properties especially the biodegradation performance of the filled material are maintained.

The invention relates to a natural fiber/polylactic acid composite material and a preparation method thereof. The natural fiber/polylactic acid composite material is prepared from the following components in parts by weight: 70 to 95 parts of polylactic acid, 5 to 30 parts of natural fiber, 0 to 5 parts of coupling agent, 0 to 2 parts of antioxidant and 1 to 5 parts of nucleating agent. The preparation method comprises the following steps: vacuum-drying the polylactic acid, the natural fibers and the nucleating agent at 60 to 100 DEG C for 6 to 12 hours, and removing moisture; weighing the components in parts by weight in proportion, blending all the raw materials in a blender for 5-10 minutes, extruding a mixture out of a twin-screw extruder at 160 to 200 DEG C, and performing cooling, grain-sized dicing and drying to obtain the natural fiber/polylactic acid composite material. Compared with the prior art, the natural fiber/polylactic acid composite material and the preparation method thereof have the advantages that the method is simple; the process is easy to implement; the composite material is high in performance, and the like.

Belonging to the plastic packaging field, the invention in particular relates to a degradable high barrier active preservative film and a preparation method thereof. The degradable high barrier activepreservative film consists of an inner layer PLA resin film, a middle layer PVA resin film and an outer layer PLA resin film from the inside out in order, the inner layer PLA resin film, the middle layer PVA resin film and the outer layer PLA resin film all include a matrix and an assistant, and the inner layer PLA resin film also includes a bacteriostatic active ingredient. The degradable high barrier active preservative film provided by the invention has excellent moisture barrier properties, gas barrier properties, bacteria resistance, oil resistance and degradability, can effectively prevent moisture or oil loss, oxidation, corruption or degradation of food and fresh and raw food, extend the shelf life, and improve the quality guarantee effect.

The invention discloses a pseudomonas aeruginosa CCTCCM208114 and application of the pseudomonas aeruginosa in petroleum pollutant degradation. The pseudomonas aeruginosa provided by the invention has the following characteristics that: 1) the pseudomonas aeruginosa has high-efficient petroleum hydrocarbon degradation capability; 2) the pseudomonas aeruginosa is capable of co-metabolizing fluorene in an inorganic salt culture medium in the presence of n-tetradecane; 3) a resting cell system of the pseudomonas aeruginosa has good polycyclic aromatic hydrocarbon degradation capability and can tolerate high polycyclic aromatic hydrocarbon concentration; 4) the pseudomonas aeruginosa has a wide substrate spectrum; and 5) the pseudomonas aeruginosa grows in an LB (Luria Bertani) culture medium or an inorganic salt culture medium (straight-chain paraffin or polycyclic aromatic hydrocarbon serves as the unique carbon source and energy source) and can generate biological surfactant. The pseudomonas aeruginosa can be widely applied to the field of bioremediation of petroleum compound pollution and is suitable for large-area popularization and application.

The invention discloses a biodegradable film based on irradiation modification and a preparing method thereof. The degradable film is composed of, by weight, 100 parts of biodegradable materials, 0-5 parts of compatilizer, 0.05-5 parts of irradiation sensitizing agents, 0.05-3 parts of antioxidants, 0.1-2 parts of light stabilizer, 0.1-3 parts of anti-ultraviolet agents and 0-2 parts of lubricating agents in a mixed mode. Compared with the prior art, the biodegradable film has the following advantages of having excellent mechanical strength, barrier performance, ageing resistance and the like, and being innovative, and application of the biodegradable film is expanded; the composite film keeps complete biodegradable performance, and has high application potentiality in medical science and environmental science, the composite film can replace petroleum-base general films to be used greatly, and environmental pressure is relieved. The preparing method is simple and easy to implement, the addition quantity of all the auxiliaries is small, cost is low, and the production process is controllable.

The present invention discloses cross-linked polymethacrylic ethylene carbonic acid ester polymer electrolyte membrane and the preparation method. The polymer electrolyte membrane consists of cross-linked polymethacrylic ethylene carbonic acid ester polymer and electrolyte solution including conductive lithium salt and non-protonic solvent. The preparation method adopts carbon dioxide, epoxy dimethylmethane and unsaturated acid anhydride which are synthesized into polymethacrylic ethylene carbonic acid ester trivalent copolymer with special functional group under the role of catalyst dyadic carboxylic acid zinc. Then the trivalent copolymer is under the cross-linking reaction so as to get the dry polymethacrylic ethylene carbonic acid ester polymer membrane. Afterwards, the dry membrane is immerged into the liquid electrolyte solution for activation, thus obtaining the cross-linked polymethacrylic ethylene carbonic acid ester polymer electrolyte membrane. The polymer electrolyte membrane prepared by the present invention has the advantages of high mechanical performance, good thermal performance and high ion electric conduction. The present invention with low cost and simple process is applicable to the industrialized production.

The invention relates to the technical field of polymer materials, and specifically relates to a high-toughness high-water-steam-baffled completely-biodegraded composite multilayer film and a manufacturing method thereof. The film comprises a structure from the second layer to the seventh layer and is composed of a PBAT based high-toughness high-barrier biodegradable material (A), a high-weatherability high-barrier biodegradable material (B), and a high-toughness functional biodegradable material layer (C). A multi-layer co-extrusion film blowing technology is adopted. Multiple material layers are compounded to prepare the film. The film is highly tough, the tensile strength can reach 18 MPa, the horizontal/vertical breaking elongation rate can reach more than 500%, no prominent difference exists in the vertical direction and the horizontal direction, the water steam baffling performance is strong, the water steam penetration rate of the film with a thickness of 10 [mu]m is 240 g/m2.24h; the processing performance is good, the minimal thickness of the film can reach 5 [mu]m; the processing equipment does not need frequent adjustment, and the film is used as a package film, an agricultural cover film, and the like.

The invention discloses a biodegradable toughened heat-resistant polylactic acid modified resin and a preparation method thereof. The polylactic acid modified resin of the present invention comprises the following raw materials by mass percentage: 30-90% polylactic acid, 5-65% thermoplastic starch, 3-40% fully biodegradable plant fiber, 1-10% auxiliary agent ; Wherein, auxiliary agent is lubricant, coupling agent and antioxidant. The raw materials are first dried, and then blended in a high-speed mixer according to the stated ratio for 5-30 minutes, and the resulting mixture is added to a twin-screw extruder for plasticization, extrusion, and granulation to obtain a biodegradable toughened heat-resistant polymer. Lactic acid modified resin. The preparation method of the polylactic acid modified resin of the present invention has simple equipment requirements and process flow, low cost, easy to realize large-scale production, and is economical and efficient; by adding thermoplastic starch and fully biodegradable plant fibers into the polylactic acid matrix, the product is guaranteed. Both good heat resistance and impact performance.

The invention discloses a preparation method of a solid microbial inoculant. The method comprises the following steps: concentrating a strain culture solution, adding an inhibitor, uniformly mixing a certain amount of solid adsorbing carrier, drying the mixture, and adding a deoxidizer to obtain the solid microbial inoculant. The method can enhance the storage time and viability of the solid microbial inoculant and lower the preservation and transportation cost; and the inhibitor and iron powder deoxidizer are added to lower the microbiological contamination probability, prevent the residual organic matters of the strain culture medium from oxidation, lower the activity of the target strain to some extent and perform promotion functions on prolonging the storage time.

The present invention relates to improvement of the brittleness and cold flowability of a carbon dioxide-propylene oxide copolymer (PPC). The invention provides a blend comprising 50 to 98 parts by weight of a PPC; 2 to 50 parts by weight of a poly(butylenes succinate) (PBS) or poly(butylene succinate/adipate) (PBSA); 1 part by weight of a maleic anhydride, and 0.5 to 3.0 parts by weight of SiO₂ and a method for producing the same. Compared with the pure PPC, the elongation rate at break of the blend of the invention increases by 3 to 15 times while the tensile strength maintains at 30 MPa or more. The blend of the PPC and PBSA can keep its dimension stably at 70° C., while the blend of the PPC and PBSA can keep its dimension stably at 55° C. No viscous flow occurs at these temperatures.

The invention discloses a biodegradable toughened heat-resistant polylactic acid modified resin and a preparation method thereof. The polylactic acid modified resin comprises the following raw materials by mass: 30-90% of polylactic acid, 5-65% of thermoplastic starch, 3-40% of fully biodegradable plant fibers and 1-10% of auxiliary agents, wherein the auxiliary agents are composed of a lubricant,a coupling agent and an antioxidant. The above raw materials are dried at first and then added into a high-speed mixer for blending for 5-30 minutes, and the obtained mixture is added into a twin-screw extruder for plastification, extrusion and granulation so as to prepare the biodegradable toughened heat-resistant polylactic acid modified resin. The preparation method of the invention is low inrequirements on equipment, simple in process flow, low in cost, easy to realize mass production, economic and highly efficient; and good heat resistance and impact properties of the produced resin areensured by adding the thermoplastic starch and fully biodegradable plant fibers into a polylactic acid matrix.

The invention discloses a preparation method of a cross-linking antibacterial acellular matrix material. Oxidized chitosan quaternary ammonium salt is cross-linked with an acellular matrix material, multiple aldehyde groups on oxidized chitosan quaternary ammonium salt are cross-linked with active groups on the acellular matrix, the structural stability of the material is improved, meanwhile, chitosan quaternary ammonium salt is grafted in the acellular matrix material, and therefore excellent antibacterial and bacteriostatic performance is provided for the acellular matrix material. According to the method, cross-linking and providing of the antibacterial performance of the material are combined, the preparation method is a preparation method of the novel functional acellular matrix material, and the method can be widely applied to the field of biological materials.

The invention relates to a biodegradable foamed material and a method for utilizing the biodegradable foamed material to manufacture a heat-resistant foamed lunch box. The biodegradable foamed material is prepared from the following raw materials in parts by mass: 100 parts of polylactic acid, 0.1-5 parts of a chain extender, 0.1-5 parts of a cross-linking agent, 0.1-5 parts of an antioxidant and0.1-5 parts of other additives. The technical scheme has the technical effects that the problems of poor heat resistance of the polylactic acid and poor processing performance of cross-linked polylactic acid are solved, and meanwhile the biodegradable performance of the heat-resistant foamed lunch box is maintained.

The invention discloses a fully degradable ceramic-imitated straw flowerpot and a manufacture method of the flowerpot. The manufacture method comprises the following steps: using crushed straw powder as materials, adding a gelatin adhesive, wherein the weight ratio of the straw powder to the gelatin adhesive is 1 to 0.5-0.8; mixing the materials, and then thermo-forming to obtain the fully degradable ceramic-imitated straw flowerpot. The industrial gelatin adopted in the invention is modified in a cross-linking manner by silane coupling agent Kh-550, zinc chloride and a borax composite modifier; the advantages of the silane coupling agent Kh-550, zinc chloride and the borax composite modifier are used for achieving a good effect. Hydroxide radical in the gelatin protein is closed to reduce the water solubility of the gelatin; a peptide chain of the gelatin protein is lengthened to generate part coordination compound, so that the flexibility of the gelatin is reinforced, and the degradation characteristic of the glue solution is kept. The fully degradable ceramic-imitated straw flowerpot product is applied to domestic urban landscaping, landscape modeling and beautifying, ecological tourism, holiday villages, families, units, public places, catering industry, wine shops, hotels, conference rooms, offices, schools, clubs, hospitals, villages, and the like.

The invention relates to the technical field of ink, and discloses environment-friendly acrylate modified waterborne polyurethane printing ink and a preparation method thereof. The printing ink comprises the following components in parts by weight: acrylate modified waterborne polyurethane, modified nano titanium dioxide, a defoaming agent, a dispersing agent and water. The preparation method comprises the following steps: adding the acrylate modified waterborne polyurethane, the defoaming agent and the deionized water into a stirring kettle, conducting stirring for 30-50 minutes at the stirring speed of 400-500 r/min, adding the modified nano titanium dioxide and the dispersing agent, and conducting stirring for 20-30 minutes at the stirring speed of 600-800 r/min, thereby obtaining the printing ink. The waterborne polyurethane printing ink prepared by the invention has the advantages of environmental protection, high solid content and excellent water resistance; and besides, the nanotitanium dioxide pigment added into the ink can be uniformly dispersed in a water-based medium, and an acrylate modified water-based polyurethane binder cannot be subjected to photocatalytic degradation, so that the service life of the ink is prolonged.