16results about How to "Degradable" patented technology

The invention discloses a preparation method of a multifunctional polyvinyl composite film and application of the multifunctional polyvinyl composite film in food preservation. The preparation method comprises the following steps: firstly, preparing Ag-coated MOF through a hydrothermal method, then uniformly dispersing the Ag-coated MOF and tannic acid into a carboxymethyl chitosan solution, and carrying out crosslinking modification on the Ag-coated MOF; and coating the prepared CMCS / TA / Ag (at) MOF mixed solution on a polyethylene film treated by oxygen plasma, and drying to form a film, so as to obtain the multifunctional polyethylene-based composite film. The CMCS and the TA are adopted to perform crosslinking modification on the Ag-coated MOF, so that the stability of the Ag-coated MOF can be further improved, and the release of silver ions is reduced. Compared with a common PE preservative film, the composite film prepared on the basis has better barrier capacity and mechanical property, and has antibacterial, anti-ultraviolet and anti-oxidation effects. The multifunctional preservative film is convenient to use and low in price, and has an important application prospect in the aspect of fresh-keeping packaging of meat products.

The invention provides a preparation method and application of a material for removing heavy metals in lithium battery waste liquid, and relates to the technical field of wastewater treatment. The method comprises the following steps: firstly, dispersing chitosan in acetic acid (1 Vol%), sequentially and respectively adding 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide, N-hydroxysuccinimide and L-cysteine, and sealing and stirring in a dark place for 24 hours; the method comprises the following steps: dissolving chitosan (Cys-CTS) in deionized water, then precipitating a product with absolute ethyl alcohol, then centrifuging, washing with ethyl alcohol and deionized water, and carrying out vacuum drying on a sample at 50 DEG C to obtain L-cysteine modified chitosan (Cys-CTS); the method comprises the following steps: adding Cys-CTS and cetyltrimethylammonium bromide into heavy metal-containing wastewater, and magnetically stirring; then, polyacrylamide is added into the stirring liquid, and after full stirring is conducted for 30 min, standing and settling are conducted, and the heavy metal can be removed. The flocculating agent is directly used for flocculating and precipitating the heavy metal, the heavy metal removal efficiency is high, the cost is saved, the technological process is simple, and complex special equipment is not needed.

This invention provides a porous Zr-MOF material for synergistic sterilization and in-situ degradation of harmful substances, its preparation method, and applications. The material comprises a three-dimensional framework structure formed by the coordination of zirconium-based metal nodes and polycarboxylic acid organic ligands, exhibiting a pore system with both micropores and mesopores. The mass ratio of zirconium-based metal nodes to polycarboxylic acid organic ligands is 1:1. The polycarboxylic acid organic ligands include one of terephthalic acid, tetrafluoroterephthalic acid, and nitroterephthalic acid. Through its pore structure design and the catalytic effect of the metal nodes, this material achieves highly efficient killing of attached or contacted bacteria, while simultaneously degrading or passivating toxic metabolites released by bacteria (such as protein toxins) and residual organophosphorus pesticides in the environment.

The utility model relates to degradable spunlaced non-woven fabric for nursing. The degradable spunlaced non-woven fabric comprises a polylactic acid fiber layer, a chitin fiber layer, a polypropylene carbonate fiber layer and regenerated cellulose fibers which are compounded in a spunlaced mode. A biodegradable polypropylene composite spun-bonded non-woven fabric layer is compounded on one side, far away from the polypropylene carbonate fiber layer, of the regenerated cellulose fiber. According to the degradable spunlace non-woven fabric for nursing, the polylactic acid fibers, the chitin fibers, the polypropylene carbonate fibers, the regenerated cellulose fibers and the biodegradable polypropylene composite spunbond non-woven fabric are all made of degradable materials, so that the non-woven fabric has degradability. In addition, the hygroscopicity of the polylactic acid fibers is poor, liquid on the surfaces of the polylactic acid fibers is absorbed by the chitin fibers with good hygroscopicity, and therefore good use experience can be kept.

The invention discloses polythioester with a main chain containing a carbon-carbon double bond, the polythioester is of a fully alternating copolymerization structure, each repetitive unit contains a sulfur element and the carbon-carbon double bond, the structural general formula is shown in the following formula (I) or (II), and in the formula, n is selected from 1-500; r1 is selected from hydrogen, methyl or isobutyl; r2, R3 and R4 are independently selected from hydrogen or methyl; r5 is selected from hydrogen, methyl, ethyl or phenyl; and R6 is selected from hydrogen or methyl. The invention discloses alternating copolymerization polythioester containing a carbon-carbon double bond with a clear chain structure, wherein the content of an alternating copolymerization chain link is 99%; a carbon-carbon double bond is introduced into a main chain, so that the polythioester has the advantages of degradability and sulfur content, also has high reaction activity, and is convenient for chemical modification for practical application. (I); and (II).

The application discloses a fibrous nitrogen-doped carbon metal mesh composite membrane for water treatment, which utilizes a metal mesh as a base film and a metal source, uses amino acids as a nitrogen source and a carbon source, and forms a stable nitrogen-doped carbon layer through a calcination process and uniformly distributes the nitrogen-doped carbon layer on the surface of the metal mesh. The application utilizes abundant amino and carboxyl functional groups in amino acid molecules, forms a stable chemical chelate structure with metal ions of the metal mesh base through coordination bonding, and effectively enhances the interfacial bonding strength between the nitrogen-doped carbon and the metal mesh base film in the carbonization process through the bonding mechanism at the molecular level.

The present application relates to the oil field chemistry and surfactant technical field, especially a kind of for high sulfur gas field sulfur particle anti-agglomerant and preparation method.The elemental sulfur anti-agglomerant provided in the present application includes the following mass fraction components: potassium stearate 2~5 parts, sodium lignosulfonate 3~9 parts, sodium p-toluenesulfonate 4~8 parts, inorganic salt adjuvant 11~23 parts and solvent 60~75 parts.The process flow of the elemental sulfur anti-agglomerant prepared in the present application is simple, and the economic cost is low, by adjusting the synergism and compatibility between surfactants, improve its dispersed sulfur particle performance, applicable to sulfur deposition prevention and control means in high sulfur gas field.

This invention discloses an environmentally friendly biodegradable mulch film and its preparation method, belonging to the field of agricultural film technology. This invention addresses the shortcomings of existing mulch film preparation technologies, such as poor compatibility and thermal stability of the organic components; and the technical problem that adding crosslinking agents increases the difficulty of mulch film degradation. A method for preparing an environmentally friendly biodegradable mulch film includes the following steps: S1, melt-blending modified cellulose, modified plasticizer, dried polybutylene terephthalate-adipate, and modified calcium carbonate powder to obtain a blend; S2, vulcanizing and molding the blend to prepare the environmentally friendly biodegradable mulch film. The mulch film material prepared by this invention has good biodegradability, thermal stability, and mechanical properties, and its crystallinity and glass transition temperature are moderate.

This invention belongs to the field of polyester biodegradable plastics technology, specifically relating to a PBAT / PLA composite biodegradable plastic and its preparation process. This invention aims to solve the problems of poor weather resistance and insufficient mechanical properties in existing PBAT / PLA composite materials. The invention involves preheating PBAT resin particles and then performing melt grafting to obtain modified PBAT; obtaining hydroxyl-terminated PBS through transesterification polycondensation, and further obtaining a triblock compatibilizer through bulk polymerization; acetylifying nanocellulose to obtain a dispersing reinforcing agent, and then melt-blending it with PLA resin particles to obtain a reinforcing masterbatch; reactively blending the modified PBAT, reinforcing masterbatch, and triblock compatibilizer, followed by vacuum drying, to obtain the biodegradable plastic. The biodegradable plastic provided by this invention maintains excellent biodegradability while possessing good mechanical strength.

This invention belongs to the field of bio-based functional polymer materials, specifically relating to a high-strength, high-transmittance bio-based polyurethane film and its preparation method. The invention utilizes the reaction of malic acid with an aromatic ring diol to obtain a malic acid polyol, which is then polymerized with isocyanate. Chain extension is performed using a small molecule chain extender, and coumarin derivative monomers are used for end-capping to obtain the bio-based polyurethane. The bio-based polyurethane film is then obtained using a casting method and ice bath cooling treatment, exhibiting high transmittance, good mechanical properties, and biodegradability. This invention pertains to bio-based renewable materials and has potential applications in fields such as agricultural mulch films and packaging materials.

The application discloses a kind of based on underwater structure settlement nondestructive intelligent monitoring optical fiber layout method, comprising the following steps: optical fiber layout is carried out on dry canal bottom surface and slope surface;Adopt negative pressure suction disc assembly and fix optical fiber on canal bottom concrete slab;When disassembling, pressurized grouting is added through communicating pipe, and biological-based adhesive strip is expanded, the negative pressure adsorption state is destroyed, and the negative pressure suction disc assembly is removed.The application can obtain canal bottom settlement data in real time before, during and in the operation period of crossing engineering construction by laying optical fiber on dry canal bottom surface and slope surface and fixing optical fiber on concrete slab by negative pressure suction disc assembly, provides direct basis for judging the influence of crossing engineering on dry canal deformation, and does not need to punch or anchor in concrete bottom plate, completely avoids damage to canal bottom structure, and will not cause any pollution to dry canal water, meets the high protection level requirement of South-to-North Water Diversion Project.

The application discloses a preparation method of konjac glucoside-based hydrophobic biomass film, and comprises the following steps: S1, purification: eluting konjac powder, drying, grinding and screening to obtain konjac glucoside; S2, modification: fully stirring and mixing the konjac glucoside obtained in the step S1 with an ethanol solution to configure a homogeneous solution, adding a sodium hydroxide solution to carry out a deacetylation reaction, and obtaining deacetylated konjac glucoside; and S3, film preparation: blending the deacetylated konjac glucoside with agar, pullulan and glycerol in a solvent, heating and stirring to form a film solution, removing bubbles, and drying to obtain the konjac glucoside-based hydrophobic biomass film formed by the deacetylated konjac glucoside, agar and pullulan; the konjac glucoside-based hydrophobic biomass film prepared by the method has good hydrophobic performance and mechanical performance, can help to reduce the dependence on fossil energy, promote the development of circular economy, and make contributions to environmental protection and sustainable development.

The utility model provides a highway semi-rigid base construction supporting formwork, belongs to the technical field of supporting formworks, mainly aims at solving the problems that an existing supporting formwork is poor in adaptability to uneven pavement construction and low in repeated utilization rate, and adopts the technical scheme that the highway semi-rigid base construction supporting formwork comprises a bottom plate, a baffle and a supporting rod, a plurality of groups of supporting rods are arranged at the top of the bottom plate, two groups of connecting plates are arranged on one side of the bottom plate, a splicing plate is arranged on the other side of the bottom plate, a bubble level is arranged at the top of the bottom plate, a plurality of groups of fixing bolts are arranged at the top of the bottom plate, a reinforcing rod is arranged at one end of the baffle, and a base plate is arranged at one end of the baffle. The bubble level can feed back the levelness of the bottom plate in real time, the construction precision of the device is improved, the base plate is installed at one end of the baffle and can prevent concrete and other construction materials from adhering to the baffle, the device is more durable, and the reuse frequency of the device is increased.

The invention belongs to the field of biological medicines, relates to delivery and stability of nucleic acid medicines, and particularly relates to a method for preparing a nucleic acid medicine based on biological ions and application of the nucleic acid medicine. The invention provides a zwitterionic biological material which is a cationic polyelectrolyte-nucleic acid micelle formed by inorganic salt and nucleic acid, has biocompatibility, degradability and mild preparation conditions, and can deliver nucleic acid into a living body. Meanwhile, as one of important plant nutrient sources, the plant source has a long coexistence history in the fields of human beings and ecological environments and complements each other. The invention further discusses the structural characteristics of the gene and provides a scheme for multi-scene application of plant genetic transformation, RNA delivery of human medicine mRNA, siRNA and the like, RNA biopesticide on agricultural pest control and the like.

The invention relates to a preparation method and application of a sodium alginate (SA) / PCN-225 / Eu (DBM) 3Bpy composite indicating film, PCN-225 powder is obtained through a hydrothermal method firstly, then the obtained PCN-225 powder is washed in ethyl alcohol and acetone to be activated to obtain PCN-225 fluorescent indicator powder with the pH sensitive characteristic, then the activated PCN-225 fluorescent indicator powder and organic europium Eu (DBM) 3Bpy (DBM: dibenzoylmethane) are subjected to a reaction, and the sodium alginate (SA) / PCN-225 / Eu (DBM) 3Bpy composite indicating film is obtained. The preparation method comprises the following steps: respectively and uniformly dispersing fluorescent powder (Bpy: bipyridine) in a sodium alginate (SA) solution, and finally preparing an SA / PCN-225 / Eu (DBM) 3Bpy composite indicating film by adopting a tape casting method. The SA film substrate has the advantages of no color, no toxicity, excellent transparency, degradability and the like; the ratio fluorescent probe constructed by the PCN-225 fluorescent indicator powder and the organic europium Eu (DBM) 3Bpy fluorescent powder has sensitive pH fluorescent color response; based on the SA / PCN-225 / Eu (DBM) 3Bpy fluorescence indication film, sensitive color development in the deterioration process of low-concentration ammonia water, milk and shrimp meat can be realized, so that real-time detection of the freshness of ammonia gas, milk and shrimp meat is realized, and the fluorescence indication film has important application prospects in the fields of ammonia gas detection and food freshness detection.

The application discloses an intelligent platform type multifunctional drug dispersant, a preparation method and application. The intelligent platform type multifunctional drug dispersant comprises an adhesive dispersant aqueous solution and a solid drug. The adhesive dispersant solute in the adhesive dispersant aqueous solution is a core-shell structure composite material. The core body is biodegradable nanoparticles, and the shell body is a nanometer film formed by polymerization of amyloid aggregates. The intelligent platform type multifunctional drug dispersant has the following excellent performances: green raw materials and biodegradability, intelligent controlled release performance, excellent hydrophobic particle dispersion capacity, ultraviolet resistance and acid rain erosion resistance, super spreading and synergistic effect, and has a wide application field and other characteristics. The preparation method uses natural proteins and biomass nanomaterials as main construction units, and uses water as a solvent in the whole preparation process, and does not involve toxic organic solvents, so that the environmental protection performance is good, and the preparation method lays a foundation for large-scale production of the intelligent platform type multifunctional drug dispersant.