131results about How to "Guaranteed degradability" patented technology

A starch-type fuel-degradable plastics is prepared from superfine starch, plasticizer, compatibilizer, cooxidanta nd synthetic degradating material. Its advantages are synergistic effect of the combination of optical degradation, thermal oxidizing degradation and biologic degradation and short degradation period (one year).

The invention provides a heat-resistant polylactic acid composite material and a preparation method thereof, which belong to the technical field of polymer materials. The preparation method solves the technical problems of low product biodegradability, high cost, poor mechanical performance and the like of the prior method for preparing polylactic acid crosslinking materials and polymer crosslinking materials. The heat-resistant polylactic acid composite material comprises the following components in portion by weight: 50 to 99 portions of polylactic acid resin with an oligomerization-D lactic acid content, 0.1 to 15 portions of nucleating agent and 1 to 50 portions of starch or modified starch, wherein the content of a poly-D lactic acid in the poly-lactic acid resin with the oligomerization-D lactic acid content is less than 5 weight percent. The preparation method for the composite material comprises the following steps: a, mixing and pelleting; b, injection molding; and c, heat treatment. The composite material has the advantages of high mechanical and heat-resistant performance. The preparation method for the composite material is simple in technical process, high in processability and low in cost and can realize large-scale industrial production.

The invention discloses a preparation method based on an amphoteric cellulose composite material. Cellulose is used as a raw material to obtain amphoteric quaternary ammonium-sulfated cellulose, then the amphoteric quaternary ammonium-sulfated cellulose is used as a carrier of oxidized grapheme and chitosan, the amphoteric quaternary ammonium-sulfated cellulose, the oxidized grapheme and the chitosan can be powerfully combined under the actions of the covalent bond, the electrostatic attraction, the hydrogen bond and the like, and then is subjected to freeze-drying to obtain the amphoteric quaternary ammonium-sulfated cellulose, the oxidized grapheme and the chitosan ternary composited material. The composite material has the renewability, the degradability, green and environment-friendly effect and high-efficiency adsorbability, the condition is mild and easy to realize in the preparation process, and the cellulose can be reasonably and effectively utilized, therefore, the preparation method has good economic and social benefits.

The invention discloses a terpolymer containing polyester chain links and polycarbonate chain links and a synthetic method thereof. The synthetic method comprises the following steps: mixing zinc-cobalt double metal cyanide complex catalyst, cyclohexene oxide and dicarboxylic anhydride in a solvent, introducing CO2 under the temperature of 30 to 150 DEG C till the pressure of CO2 is 0.5 to 10.0MPa, carrying out copolyreaction for 0.5 to 48 hours so as to obtain a crude product, and preparing the terpolymer which contains polyester chain links and polycarbonate chain links and has excellent thermal property and easy decomposition after purification. The molar percentage content of the polyester chain links, the polycarbonate chain links and polyether chain links of the terpolymer containing polyester chain links and polycarbonate chain links in the main chain are respectively 5 to 70 percent, 23 to 90 percent and 0.5 to 7 percent.

The invention discloses a preparation method of a colloidal solution of nano-ZnO. The method comprises the following steps: mixing an aqueous modified cellulose solution having a concentration of 0.001-100g/L with a zinc salt solution having a concentration of 0.01-100g/L according to a volume ration of 1:10-100:1, wherein the modified cellulose is dialdehyde hydehydroxypropyl methyl cellulose obtained through the selective oxidation of the secondary hydroxyl groups in the C2 and C3 positions of hydroxypropyl methyl cellulose; and slowly adding an alkaline solution for adjusting the pH value to 8.5-11.5, and stirring at 20-90DEG C for 1-600min until reaction completion in order to obtain the colloidal solution of nano-ZnO having an average particle size of 1-100nm. The prepared nano-ZnO has the advantages of ultrahigh stability, antibiosis and ultraviolet resistance, good biocompatibility and good biodegradability, and can be applied to the coat field, the textile field, the medical health field and the like.

Belonging to the technical field of high polymer materials, the invention relates to a degradable fiber and a preparation method thereof. The degradable fiber material is prepared from the following components by weight: 60-90 parts of poly(butylene adipate/terephthalate), 10-40 part of polylactic acid, 0.5-6 parts of a compatibilizer, 0.2-5 parts of a nucleating agent, and 0.2-2 parts of an antioxidant. Compared with the prior art, the degradable fiber provided by the invention has good melting spinnability under a low spinning temperature of 170-240DEG C and a high spinning speed of 500-2000m/min, and can crystallize in later spinning and treatment processes, so that the fiber can have high mechanical strength and lasting and steady soft handfeel, and can satisfy the use requirements so as to expand application fields.

The invention discloses a degradable polyurethane biological material and a preparation method thereof. The degradable polyurethane biological material is prepared from the following components in parts by weight: 7.8 to 19 percent of poly epsilon-caprolactone (PCL), 3 to 15.6 percent of polyethylene glycol (PEG), 12.8 to 13.8 percent of isocyanate, 3.1 to 4.1 percent of a chain extender, 0.09 to0.11 percent of a catalyst and 57.6 to 63 percent of a green solvent, wherein isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), dicyclohexyl methane diisocyanate (HMDI) or mixed isocyanate of more than two of the above materials is adopted as the isocyanate. The preparation method comprises the following steps: blending according to the proportion of the raw materials, adding the vacuum-dried PCL and PEG into the isocyanate dropwise, reacting at 70 to 85 DEG C for 2 to 3 hours, adding the solvent and the catalyst, adjusting the temperature to be 55 to 65 DEG C, adding the chainextender, performing chain-extending reaction for 4 to 5 hours, casting the obtained polyurethane solution on a polytetrafluoroethylene mold, and naturally volatilizing the solvent in a ventilation kitchen to prepare a polyurethane film.

The invention relates to a PBAT melt-blowing degradable non-woven fabric and a manufacturing method thereof. The manufacturing method comprises: blending 100 parts of dried PBAT, 10-50 parts of dried polylactic acid, 5-30 parts of dried polycaprolactone, and 0-10 parts of compatilizer for 3-10 min, through a screw extruder, heating, melting, and extruding the above to form a melt, when the melt is extruded from the spinneret orifice of a die head, the melt being blown by high-pressure hot airflow on two sides of the spinneret orifice, and being stretched to superfine fibers and coagulating on a drum-type receiver which is a certain distance away from the nozzle, the superfine fibers bonding to form a non-woven fabric, after being cooled, taking the non-woven fabric down from the drum and putting the non-woven fabric in a drying oven to dry and shape, to obtain the PBAT melt-blowing degradable non-woven fabric. Compared with the prior art, the method is simple in device, short in process flow, and low in energy consumption. Using the melt-blowing method to manufacture the non-woven fabric, fibers of the non-woven fabric are thin in diameter, and the non-woven fabric is characterized by large specific surface area, high porosity, and excellent filter efficiency.

The invention discloses a method for preparing alpha-calcium sulfate hemihydrates (alpha-CSH) /beta-tertiary calcium phosphate (beta-TCP) porous granular-type composite artificial bones, which is characterized in that the alpha-CSH is directly synthesized on the surface and/or in the pores of the beta-TCP granules synchronously by the hydrothermal synthesis process and finally the alpha-CSH/beta-TCP porous granular-type artificial bones is prepared. The invention has the advantages that the preparation process is simpler, the preparation period can be effectively reduced, and the preparation efficiency is improved; the proportion between alpha-CSH and beta-TCP phases of the granular-type composite artificial bones can be effectively controlled, thereby controlling the pore structure of the artificial bone granules; meanwhile, the invention guarantees the in-situ solidifying performance and degrading performance of the composite artificial bones, controls the evenness of the product and the porosity and pore diameter of the beta-TCP granules, improves the bone-formation performance and degrading performance of the composite artificial bones and further improves the quality of the product, thereby finally obtaining the composite artificial bones having self-solidifying performance and controllable degradation and having a certain biomechanical strength. The invention has good application and market prospect.

The invention discloses a preparation method of a microcarrier used for cell three dimensional multiplication culture, and belongs to the field of tissue engineering material. According to the preparation method, Poly-L-lactic acid (PLLA) is taken as a matrix, gelatin is taken as a dispersant, and composite microspheres are prepared; the particle size of the composite microspheres is adjusted viacontrolling the concentration of a PLLA dichloromethane solution, the mass ratio of nano-hydroxyapatite (nHAp) to PLLA, and the using amount of gelatin; the PLLA is taken as the matrix to ensure the mechanical strength and biological degradability of a support; composite nHAp is capable of improving the osteo inductivity and the conductivity of the support, and at the same time, assisting PLLA toimprove cell osteogenic capability, and avoiding damage of cells under an overly acidic environment; the existing of nHAp is capable of forming a large amount of small pores on the surfaces of the PLLA microspheres, the existing of the small pores is capable of improving the mass transfer capability of the support, and providing cells with more abundant attachment sites. The microcarrier possessesexcellent biological performance on osteoblasts, and is suitable to be used in the field of bone tissue engineering.

The invention discloses a method for extracting 10-deacetylbaccatin III from taxus chinensis. The method comprises the following steps: soaking and extracting 10-deacetylbaccatin III in taxus chinensis by adopting an aqueous solution containing a stability maintainer; and extracting, performing discoloring and flocculating treatment, recrystallizing and the like, thereby obtaining the high-purity10-deacetylbaccatin III. The method disclosed by the invention is clean, low in cost, non-harsh in extraction conditions, less in by-products, less in pigments and high in extraction rate, and is applicable to industrialized production and market popularization and application.

The invention discloses a corn slow-release fertilizer. The corn slow-release fertilizer is prepared by uniformly spraying a layer of water-soluble high molecular polymer on the surface of fertilizer particles, and comprises the following ingredients: 8.5-9.5 weight portions of (NH4)2HPO4, 5.5-6.5 weight portions of K2SO4, 30-32 weight portions of large particle urea, 8-10 weight portions of diatomite, and 22-24 weight portions of high molecular polymer. The corn slow-release fertilizer effectively overcomes nitrogen loss caused in fertilizing, increases the utilization rate of nitrogenous fertilizers, benefits the absorption and continuous utilization of crops, fully makes full use of the effects of fertilizers, and simultaneously increases the yield of corn. The corn slow-release fertilizer conforms to the policy guidance of developing energy saving, environment friendly, and continuously efficient agriculture.

The invention discloses a degradable metal guided tissue regeneration barrier membrane and a preparation method thereof. A transparent liquid medium which does not react with metal is used as a protective solution, and especially when a sodium hydroxide solution is adopted, it is achieved that pure magnesium and magnesium alloy materials are processed in water. By using a flowing liquid membrane,the heat diffusion situation on the periphery of a processing site can be obviously improved, and self cleaning in the processing process is achieved. On the basis that the processing quality of the micro-nano structure of the metal surface is ensured, the processing precision is obviously improved, the processing precision reaches about 10 micrometers, and it is of great significance for loadingof a specific drug, such as a drug of a specified size. The content of oxides in the processing product can be remarkably reduced, the adverse effects of excessive oxides on drug loading are avoided,and the degradability and the mechanical property of the metal guided tissue regeneration membrane are ensured. Through the multi-level mesh hole structure of micro-nano patterns, level-by-level release of the drug is achieved; compared with the prior art that deep holes are directly dug in the surface of magnesium alloy to load the drug, the medical treatment effects of treating inflammation andguiding tissue regeneration are greatly improved.

The invention discloses one kind of fast starting biology activated charcoal enhancement technology. First treat the water with conventional tap water processing; After that, the conventional processing water is introduced to ozone contact oxidation column; The ozone contact oxidation column's water leakage is send in again by manual screening, domesticates in universities biology fungus and be fixed in fast start biology activated charcoal storage tank; The coal pot water leakage enters the disinfection contact pond again, extinguishes the microorganism in the running water. This invention domesticates the microorganism technology through manual screening, the immobilized cell technology and the water treatment craft technology, the economy removes the tap water convention processing under-water micro organic matter highly effectively, specially ' three leads ' matter, which enables the water leakage in the entire system to achieve the new tap water quality standard request, thus the realization depth processing technology universities and the efficient request, guarantees people's potable water safety and enhances the tap water deeply processing efficiency with the method of biology activated charcoal enhancement technology.

The invention discloses a plastics biodegrading method with coleoptera larvae and the intestinal microflorae of the coleoptera larvae and belongs to plastics degrading methods. The method specificallycomprises the following steps of, firstly, uniformly mixing plastics and feeds, and filling the mixture into a container containing yellow melworms; secondly, culturing the yellow melworms in an incubator; thirdly, during the culturing process, replenishing feeds. The plastics biodegrading method with the coleoptera larvae and the intestinal microflorae of the coleoptera larvae can not only improve the survival rate of the larvae, but also improve the plastics degrading rate by more than 150%.

The invention discloses a sewage treatment method. The sewage treatment method comprises the following steps: S01, pre-treating sewage: enabling the sewage to pass through a first-grade pre-treatment system to remove floating matters and suspension matters; S02, introducing the sewage treated by the step S01 into a second-grade reaction system, and enabling the sewage to pass an anaerobic section and an aerobic section in sequence; degrading organic matters in the sewage and removing main pollutants in the sewage through utilizing microorganisms attached on surfaces of emergent aquatic plants and artificial fillers; S03, introducing the sewage treated by the step S02 into a third-grade advanced treatment system, and carrying out flocculation, precipitation, filtration and disinfection deep treatment on the sewage to reach emission or recycling standards. The invention further discloses a sewage treatment system. By adopting the method and the system, provided by the invention, the occupied area of a sewage treatment device can be reduced, the odorous pollution of a sewage treatment plant is reduced; the yield of sludge can also be reduced and the sludge treatment and disposal difficulty is reduced; particularly, the method and the system can meet the conditions in low-temprature regions.

The invention discloses a degradable high-barrier composite membrane and a preparation method thereof.The composite membrane is of a layer structure of one of A/B, A/C, A/B/C and A/B/A/C. The layer A is a modified poly (butylene terephthalate)-adipate copolymer and comprises, by mass, 50-103 parts of poly (butylene terephthalate)-adipate copolymer, 20-109 parts of thermoplastic starch and 2-10 parts of compatilizer; 0.5 to 10 parts of a tackifier and 1.5 to 42 parts of an auxiliary material; the layer B is paper or a cellulose membrane; and the layer C is a composite material and comprises the following components in parts by mass: 40-150 parts of a full-biodegradable polymer, 12-60 parts of a reinforcing filler, 2-16 parts of an antistatic agent and 0.1-15 parts of an ultraviolet light absorber. The composite film disclosed by the invention has good barrier property and relatively high interlayer peel strength, and can be applied to the field of packaging of liquid and fresh foods.

The invention relates to shell powder interior wall paint and a preparation method and device thereof. The shell powder interior wall paint is prepared from the following components: coarse shell powder, fine shell powder, a dispersing agent, an emulsifying agent, a defoaming agent, ethanol, sodium carbonate and vegetable gum, wherein the particle size of the coarse shell powder is 20-50 meshes, the content of CaO in the coarse shell powder is not higher than 10%, the particle surface of the coarse shell powder is covered with an aluminum oxide coating layer, chopped fibers are embedded in thealuminum oxide coating layer, and a copper-manganese catalyst is doped in the aluminum oxide coating layer; the particle size of the fine shell powder is 500-800 meshes, and the content of CaO in thefine shell powder is not lower than 50%. In the composition of the scheme, the coarse shell powder is used for replacing most of the fine shell powder, the use amount of vegetable gum is greatly reduced, the adsorption capacity is greatly improved, and the capacity of adsorbing and degrading formaldehyde and adjusting the humidity of the shell powder interior wall paint is effectively guaranteed.

The invention discloses a pneumatic de-molding type sewage treatment combined filler and a matched device thereof, belongs to the field of combined fillers, and has the advantages that in the use process, oxygen-containing gas is introduced into a hollow elastic bag rope, so that on one hand, the hollow elastic bag rope can be expanded to drive a film attaching disc silk screen to outwards extendand expand; a biofilm loose due to the pulling action, which accelerates the shedding of the aged biofilm initially, on the other hand, oxygen-containing gas is dispersed into the sewage through the gas filtering shaping pipe to form gas flow impact on the film attaching disc silk screen, so that the falling of the biological film is further promoted, the oxygen content of the sewage is increased,and the degradation efficiency of the biological film is improved; the oxygen-containing gas drives a collision ball to continuously float up and down and collide with an air filtering shaping pipe,so that the film attaching disc silk screen generates certain vibration and depth to promote falling of the biofilm, the blockage condition of the biofilm is greatly reduced through the three auxiliary demolding processes, and the continuous and efficient degradation performance of the combined filler is guaranteed.