68 results about "Polymer degradation" patented technology

Disclosed in the present invention are a high-strength polylactic acid material, a preparation method therefor, and use thereof, belonging to the technical field of macromolecular materials. The high-strength polylactic acid material comprises the following components in parts by weight: 80-90 parts of polylactic acid, 10-20 parts of polybutylene adipate terephthalate, 1-5 parts of a nucleating agent, and 2-5 parts of a compatibilizing agent. The mesh number of the nucleating agent is 1500-2500 mesh; the compatibilizing agent is polycaprolactone, and the intrinsic viscosity thereof is 1.0-3.0 dL / g. The present invention lowers the melting temperature and shortens the melting time of PLA and PBAT, reduces the negative impact of polymer degradation and aging on mechanical properties, produces a heterogeneous nucleation effect, and performs the function of a crystallization nucleus in the cooling crystallization stage, improving crystallization speed and crystallinity, while causing the crystalline phase structure to tend toward a spherulitic state, improving the tensile strength of the polylactic acid material.

The present disclosure provides a detection and analysis method for rapid delineation of aging stages of styrene-butadiene-styrene (SBS) modified asphalt, including the following steps: performing a Fourier transform infrared spectroscopy (FTIR) test on unaged SBS-modified asphalt samples to obtain a copolymer index of IB0 / S0 and neat asphalt functional group indexes, including the SI0, IB, aI0, ARI0, and CI0; performing the FTIR test on the aged SBS-modified asphalt samples to obtain an actual index of IB / S, SI, IB, aI, ARI, and CI; and delineating three aging stages of SBS-modified asphalt, including a polymer swelling stage, a polymer degradation stage and a component imbalance stage according to changes of functional group indexes. According to the present disclosure, the actual aging stages of the SBS-modified asphalt can be determined rapidly and accurately, providing a reasonable basis for the decision on pavement maintenance timing and mode.

The invention relates to the technical field of chemical flooding recovery efficiency improvement, in particular to a polymer-surfactant binary in-situ emulsification system assisted water-gas alternating flooding numerical simulation method which comprises the following steps: determining reaction kinetic components of an emulsification reaction; establishing a reaction kinetic equation of an emulsification reaction; determining reaction kinetic parameters of the emulsification reaction; establishing a reaction kinetic model of the emulsion reaction; and creating a geological concept model based on CMG software, and carrying out optimization design on an oil production scheme. According to the method, in-situ generation, demulsification, solid-phase trapping, flow dispersion and polymer degradation processes of emulsion are quantitatively described by utilizing a reaction kinetic equation, and a physical process is ingeniously represented by utilizing chemical reaction kinetics in combination with mature reservoir numerical simulation software; functional numerical simulation development is carried out on polymer-surfactant binary in-situ emulsification system assisted water-gas alternating flooding, and a set of practical polymer-surfactant binary in-situ emulsification system assisted water-gas alternating flooding numerical simulation method is formed.

The invention belongs to the technical field of high polymer material recovery, and particularly relates to a method for degrading nylon 6 or a similar polymer thereof into a lactam monomer. The method comprises the following steps: placing waste nylon 6 or a similar polymer thereof, an activation accelerator and an alcohol solvent in a closed reaction container according to a certain proportion, reacting for a period of time at a certain temperature, and evaporating to remove the solvent to obtain a first-step degraded crude product; recrystallizing the degradation crude product obtained in the first step to obtain a pure alcoholysis product; or directly carrying out a second-step cyclization reaction, namely putting the first-step degradation product, alkali, an additive and a solvent into a closed container, reacting at a certain temperature, directly filtering to remove filter residues, and evaporating the solvent in the obtained solution to dryness to obtain the high-purity lactam monomer. According to the invention, nylon 6 or similar polymers thereof can be degraded into corresponding lactam synthetic monomers with high efficiency and high selectivity, the operation is simple, the condition is mild, the post-treatment is simple and convenient, and the method is suitable for large-scale industrial application.

The invention discloses an anti-aging waterproof coiled material and a preparation process thereof, and relates to the technical field of waterproof coiled materials prepared from high-molecular compounds. According to the waterproof coiled material, linear low-density polyethylene serves as a matrix, and an antioxidant, a light stabilizer, an ultraviolet absorbent, a synergistic agent, a rare earth cerium complex, carbon black and other components are added in a matched mode. The preparation process comprises the steps of mixing ingredients, premixing and melting, extrusion molding, online rheology monitoring and temperature dynamic adjustment, cooling and shaping and the like. According to the invention, through construction of a multi-component synergistic anti-aging system, the components play a protection role in different stages and different paths of polymer degradation, and a three-dimensional protection network is formed; the prepared waterproof coiled material has excellent ultraviolet aging resistance and thermo-oxidative aging resistance, the product quality stability is high, the comprehensive performance is balanced, the service life is long, and the waterproof coiled material has good application prospects and economic value.

Methods of forming compostable polymeric materials and compostable polymeric materials formed through the methods are provided herein. In an embodiment, a method includes blending a biodegradable polymer chosen from a biodegradable polyester, a biodegradable polysaccharide, or combinations thereof, with a polymer-degrading enzyme and a plasticizer to form an intermediate composition. The intermediate composition is gel extruded to form the compostable polymeric material. In an embodiment, a compostable polymeric material is formed by a method comprising the recited steps.

The application discloses MS glue, an MS glue additive and a preparation method of the MS glue additive, and the preparation method of the MS glue additive comprises the following steps: dissolving pentamethyl piperidyl alcohol in an organic solvent, heating, and stirring; adding octadecadiene acid dimer, and stirring; adding diisopropyl bis(dioctyl pyrophosphoric acyloxy) titanate, and stirring; heating, and extracting the solvent under reduced pressure to obtain a product. In the technical scheme, the MS glue additive can effectively capture free radicals in a polymer degradation chain reaction, thereby inhibiting a photo-oxidation process, and achieving a light stabilization purpose. Through evaluation, the additive can greatly reduce performance attenuation and yellowing of the MS glue under light aging.

The invention relates to methods of identifying enzymes and methods of screening for optimised enzymes for degrading polymers such as plastics. The invention also relates to polymer degrading enzymes and nucleic acids encoding these enzymes as well as expression cassettes and host cells comprising the nucleic acids. The invention also relates to uses of these enzymes or the host cells comprising the nucleic acids encoding these enzymes to degrade polymers such as plastics. Lastly, the invention also relates to the crystal structure of plastic degrading enzymes and uses of these structures.

The invention relates to the technical field of polyglycolic acid processing, and provides a degradation method and a preparation device of a polymer for well drilling leakage stoppage, and the degradation method comprises the following steps: preparation, pressurization, heating, regulation and control, and sampling inspection. The preparation process comprises the following steps: weighing 3 parts of 15g of A particles by using an electronic scale, and the sampling inspection process comprises the following steps: 8 hours later, adjusting a control cabinet, sequentially cooling and depressurizing a reaction kettle, opening the reaction kettle after safety is confirmed, closing the reaction kettle again, and repeating the steps of pressurizing, heating and regulating. According to the technical scheme, the problem that in the prior art, whether the degradability of a polyglycolic acid (PGA) material exists or not needs to be judged by means of observation, analysis and the like is solved, a degradable polyglycolic acid (PGA) particle sample is placed in a beaker, clear water is added, the beaker and the beaker are placed in a hot box, the mixture is heated for a period of time at different given temperatures, then the surface morphological change of the sample is observed, and the detection result is accurate. The thermal stability of the material at different temperatures can be evaluated according to the color change, the surface structure damage and the like.

The invention belongs to the technical field of environmental management, and particularly relates to a method for degrading polyolefin waste into oil. The invention provides a method for degrading polyolefin wastes into oil, which comprises the following steps: mixing the polyolefin wastes and a catalyst, and carrying out ball milling to obtain a degradation product; the catalyst is inorganic compound particles; the degradation product comprises a gas phase and a liquid phase, the gas phase comprises short-chain alkane, the liquid phase is an oily compound, and the liquid phase comprises one or more of long-chain alkane, cycloalkane and aromatic compounds. Carbon-carbon bonds in molecular chains of polyolefin compounds can be efficiently attacked under the action of a catalyst through the mechanochemical action initiated by mechanical force of a ball mill, so that the breakage reaction of macromolecular chains is triggered, the polymer degradation efficiency is remarkably improved, and the polyolefin compounds are degraded into gas and liquid oil compounds; the liquid oil compound can be applied to the fields of industrial lubrication, energy supply, chemical raw materials, infrastructure construction and the like.

The invention relates to the field of chemical medicine impurities, and particularly discloses a cefoperazone sodium polymer degradation impurity and a preparation process thereof.The preparation process comprises the steps that cefoperazone sodium serves as a raw material and is subjected to an acylation reaction with pivaloyl chloride, then a product obtained after the acylation reaction reacts with 7-TMCA, and the cefoperazone sodium polymer degradation impurity is obtained. According to the method, cefoperazone sodium is taken as a raw material, cefoperazone sodium polymer degradation impurities are prepared through a synthesis method, the content of the cefoperazone sodium polymer degradation impurities is higher, synthesized components are purer, crystallization and purification are facilitated, a target product with higher purity is prepared, the purity reaches 95.21-99.88%, the yield is 45-50%, the process is simplified, the period is short, operation is easier, and large-scale preparation is easy.

The invention discloses a lithium ion battery diaphragm as well as a preparation method and application thereof, and relates to the technical field of lithium ion battery diaphragms. The lithium ion battery diaphragm comprises the following components in parts by mass: 70-95 parts of matrix resin, 0.5-5 parts of an antioxidant, 5-30 parts of inorganic particles, 0.1-2 parts of a coupling agent and 0.5-3 parts of a processing aid. And by introducing the antioxidant, the oxidation erosion of the electrolyte to the diaphragm matrix resin at high voltage / high temperature is effectively inhibited. The design can block an oxidation chain reaction and reduce pore structure damage and polymer degradation, so that the long-term performance stability of the diaphragm is maintained. The rigid network of the inorganic particles and the interface bonding effect of the coupling agent synergistically inhibit high-temperature thermal shrinkage, and the antioxidant reduces the risk of oxidation side reaction. The combination significantly improves the dimensional stability and flame retardancy of the diaphragm under a high temperature condition, and reduces the potential safety hazards such as battery swelling and short circuit.

The invention discloses a photoaging-resistant PBAT functional resin, and also discloses a preparation method and an application of the photoaging-resistant PBAT functional resin. The chemical formula of the photoaging-resistant PBAT functional resin provided by the invention is as shown in a formula I in the specification. A TMP structure is introduced into a PBAT molecular chain segment, and PBAT-TMP block copolyester with a stable structure, namely the photoaging-resistant PBAT functional resin, is formed by a chemical copolymerization method. The PBAT-TMP block copolyester can effectively capture free radicals R in polymer degradation chain reaction under the action of illumination, so that the effect of continuously resisting light aging is achieved. The light-aging-resistant PBAT functional resin prepared by the invention has long light-resistant stability and a stable structure. Formula I.

The invention relates to the technical field of oilfield chemistry, in particular to an environment-friendly biological blocking remover for oil extraction and a processing technology of the environment-friendly biological blocking remover. The environment-friendly biological blocking remover is prepared from the following components in percentage by weight: 4 to 6 percent of alkyl glycoside, 4 to 6 percent of sophorolipid, 3 to 5 percent of methylglycine diacetic acid, 5 to 8 percent of rhamnolipid, 6 to 8 percent of compound microorganism fermentation liquor, 5 to 8 percent of lipase, 5 to 8 percent of protease, 6 to 8 percent of polymer degrading enzyme, 2 to 4 percent of citric acid, 2 to 4 percent of mandelic acid, 1 to 2 percent of glycerol, 1 to 2 percent of trehalose and 31 to 57 percent of deionized water. The biological enzyme, the biological surfactant, the organic acid and the chelating agent cooperate to fundamentally disintegrate blockages, meanwhile, the microcapsule technology and the nano-bubble technology are used, the action period is greatly prolonged, blockages of deeper parts can be treated, and the treatment effect is good. And corrosion and damage of strong acid and strong alkali to underground pipe columns, tools and stratum rocks are avoided, and secondary damage caused by plug removal operation is prevented.

The instant invention concerns a process for fragmenting a polymer chain, comprising an oxidative degradation step wherein the polymer chain is contacted with a reduced form of a metal M and an oxidant such as dioxygen, and wherein the polymer carries covalently bound chemical groups acting as a ligand of said reduced form of the metal M.The invention also relates to methods making use of this fragmentation process as a first step of a degradation process of the polymer especially useful for avoiding the negative impact of a polymer to the environment. In this connection, the invention relates to the use of polymers carrying chemical groups acting as a ligand for a reduced form of a metal M, as a polymer biodegradable in an environment wherein the reduced form of a metal M is present.

The present disclosure provides methods of mitigating polymer degradation in poly (hydroxyalkanoates) including carboxylic acid end groups and monomer repeat units that are readily degradable to form unsaturated carboxylic acid byproducts. The carboxylic acid end groups are reacted with an end-capping agent selected from the group consisting of carbodiimides, diisocyanates, epoxides, and mixtures thereof, and the poly (hydroxyalkanoate) is further reacted with an anhydride to graft the side chains onto the poly (hydroxyalkanoate).

Methods of degrading a polymer are provided. The methods may include incubating the polymer with Pseudomonads and / or Bacillus species and / or bacterial consortia thereof. Kits for degrading a polymer are also provided. The kits may include Pseudomonads and / or Bacillus species and / or bacterial consortia thereof. The kits may also include an incubator for culturing the Pseudomonads and / or the Bacillus species and / or bacterial consortia thereof. Compositions for degrading a polymer-containing substrate including the Pseudomonads and / or Bacillus species and / or bacterial consortia thereof are also provided.

This invention discloses an in-situ polymer characterization method based on conductive two-dimensional materials. First, conductive two-dimensional material films and polymer films are prepared. Then, a composite material is constructed based on the conductive two-dimensional material films and the polymer films, such that the conductive two-dimensional material films act as electrical probes, uniformly and orderly dispersed within different polymer matrices, and forming continuous conductive pathways within the composite material. The composite material is used as a platform-based test unit to measure its resistance, obtaining resistance change curves. Analysis and processing of these resistance change curves reveal the structural changes of the polymer matrix during thermal transition and degradation processes, and the glass transition temperature and melting point of the polymer matrix are calculated. This method can be applied to important fields such as polymer thermal property characterization, polymer degradation process research, and polymer degradability evaluation.

The application discloses an upgrading and recycling method for catalytic alcoholysis of PET based on in-situ generation of alkali-rich proton salt, and relates to the fields of polymer degradation and green catalysis technology. The method uses organic alkali and amino acid as catalytic components, constructs an alkali-rich proton salt composite catalytic system in-situ in an ethylene glycol or methanol alcoholysis medium, and does not need to synthesize and purify the catalyst in advance. The pretreated PET fragments are added into the system, and catalytic alcoholysis is carried out under mild conditions to efficiently prepare BHET or DMT. The alkali-rich proton salt composite catalytic system is constructed in-situ, the catalyst does not need to be synthesized and purified in advance, the process steps are simplified, the energy consumption and cost are reduced, the efficient alcoholysis of PET under mild conditions is realized, the high-purity BHET or DMT product is obtained, the catalyst can be recycled, and the problems of complicated preparation of the existing PET alcoholysis catalyst, high reaction energy consumption and difficult product purification are solved, which meets the needs of green environmental protection and industrial production.

According to the technical scheme, the method comprises the following steps that 1, activated carbon is added into water, heating and stirring are conducted, suction filtration is conducted after stirring is conducted, then solids are collected and dried, and activated AC is obtained; 2, adding all AC into the HNO3 aqueous solution, heating and stirring, and condensing and refluxing for 3-15 hours; after the reflux is finished, washing a product to be neutral, and drying overnight to obtain AC-H; 3, transferring AC-H into a NaOH aqueous solution, stirring at normal temperature, and then washing to be neutral to obtain AC-H-Na; 4, polylactic acid, AC-H-Na and absolute methanol are added into a reaction kettle, the temperature is increased to the specified temperature in the nitrogen environment for a reaction, and methyl lactate is obtained; the method adopts nitric acid and sodium hydroxide step-by-step modified activated carbon as a catalyst to catalyze degradation of polylactic acid, has high catalytic efficiency, and the catalyst is easy to recover, and reduces reaction energy consumption at the same time; belongs to the technical field of polymer degradation.

The application provides a polymer degradation method, comprising the following steps: under visible light conditions, a polymer and an oxidant generate an oxidation product through an oxidation reaction under the action of a catalyst; wherein the catalyst is selected from a compound or a mixture capable of generating chlorine or bromine radicals in situ; the oxidant is selected from oxygen or air, the pressure of the oxidant gas is 1 atm-100 atm; the reaction temperature of the oxidation reaction is 0 DEG C-100 DEG C, and the reaction time is 8h-48h. The degradation method has low reaction cost, can convert the polymer into a high-value chemical product, and has simple operation, good safety, and is a mild and environment-friendly degradation method. The degradation method can solve the problems of increased reaction cost and environmental pollution in the polymer degradation process.

This invention discloses a NaP molecular sieve catalyst prepared using Fischer-Tropsch synthesis waste residue, its method, and its application, belonging to the field of catalytic materials and polymer degradation technology. It includes a NaP-type molecular sieve support on which active metal components copper and nickel are loaded. The loading amounts of copper and nickel on the support are 12–76 wt% and 11–70 wt%, respectively. The silica-alumina ratio of the NaP-type molecular sieve support is 6.5–7.5, the sodium-silicon ratio is 1.3–2.0, the water-silicon ratio is 75–90, and the water-sodium ratio is 50. The NaP molecular sieve catalyst can be applied to the depolymerization of lignin. The NaP molecular sieve catalyst combines the catalytic advantages of two metals, effectively improving the liquefaction rate of lignin.

The invention discloses a real-time monitoring system and method for nano-enzyme degradation polymer dynamics based on plasmon imaging, and the system comprises a monochromatic laser emission module which is used for generating excitation light with a fixed wavelength, and adjusting a light path to excite surface plasmon resonance; the sample reaction module comprises a plasmon resonance gold sheet of which the surface is modified with a polymer molecular layer, and a sample pool for accommodating a reaction solution; the optical detection module is used for collecting and detecting scattered light signals from the sample reaction module and carrying out image acquisition; wherein the monochromatic laser emission module, the sample reaction module and the optical detection module are sequentially connected according to a light path; the invention provides a new important research means for researching the local change of the single nano enzyme and the interaction of biomolecules.

The present invention discloses a degradable polymer part suitable for 3D printing and a method for preparing the same, relating to the technical field of 3D printing liquid resin materials. The method comprises obtaining an acrylate-based crosslinker through the reaction of dopamine hydrochloride and polyethylene glycol diacrylate; mixing a monomer mixture including the crosslinker and a photoinitiator to form a 3D printing precursor solution; and obtaining a three-dimensional polymer part after 3D printing and curing. The three-dimensional polymer part is capable of dissolving into a liquid state in an aqueous solution. The present invention regulates the degradation rate of the polymer by controlling parameters such as the ratio of monomers and the ratio of solvents, thereby obtaining a polymer part with rapid degradation and controllable degradation.

Laboratory Equipment For Controlled Polymer Degradation And Chemical Stability Analysis

The present invention belongs to the technical field of waste polymer degradation and metal-organic framework (MOF) material preparation, and discloses a method for preparing aliphatic carboxylic acid ligand MOF by two-step hydrothermal degradation of waste nylon 66, comprising the following steps: S1. dispersing waste nylon 66 and a strong base compound in water to obtain a dispersion; S2. subjecting the dispersion to a hydrothermal reaction at 180-220°C for 12-48h to hydrolyze nylon 66 to obtain a nylon 66 degradation solution; S3. adding a metal salt solution thereto, and continuing the hydrothermal reaction at 60-160°C for 3-24h to coordinate the adipic acid salt and hexamethylenediamine in the degradation solution with metal ions to synthesize MOF, and the obtained product is an aliphatic carboxylic acid ligand MOF material. The present invention realizes the preparation of high-value-added MOF products from waste nylon 66 raw materials through a two-step hydrothermal method, the method is simple, realizes waste resource utilization, improves resource utilization, and reduces MOF production costs.

A nanobubble-enhanced fluid to transport acid to a subterranean formation. The nanobubble-enhanced fluid generally comprises nanobubbles, an acid, and an additive. The acid may be an organic acid or a mineral acid. The additive may be a salt or brine, corrosion inhibitor, corrosion inhibitor intensifier, biocide, scale control additive, clay control additive, gel stabilizer, anti-oxidant, polymer degradation prevention additive, relative permeability modifier, surfactant, demulsifier, foaming agent, wetting agent, dispersant, flocculant, scavenger (e.g., H2S scavengers, CO2 scavengers, or O2 scavengers), gelling agent, iron control agent, chelating agent, complexing agent, sequestering agent, metal ion control additive, or combinations thereof.

The present disclosure provides methods for mitigating polymer degradation in poly(hydroxyalkanoates), which include carboxylic acid end groups and monomeric repeat units which are susceptible to degradation to form unsaturated carboxylic acid by-products. The carboxylic acid end groups are reacted with an end-capping agent selected from the group consisting of carbodiimides, diisocyanates, epoxides, and mixtures thereof, and the poly(hydroxyalkanoates) are also reacted with an acid anhydride to graft side chains onto the poly(hydroxyalkanoates).

The application discloses a polymer shear degradation evaluation method based on a FENE-P model and belongs to the field of polymer turbulent flow drag reduction. The method comprises the following steps: based on a polymer degradation loop experimental device, polymer degradation influencing factor experiments are carried out, and a degradation rate is calculated; rheological experiments are carried out on solutions in different degradation stages; rheological experimental data are fitted, and a rheological equation is established; viscoelastic parameters in the FENE-P model are determined, a momentum equation and a molecular deformation transport equation are corrected, and relevant UDF files are compiled; the UDF files are loaded into source terms, transient terms and convection terms of a fluid domain of FLUENT software, FENE-P model related viscoelastic parameters are changed, polymer fluid degradation flow field simulation is realized; differences between Newton fluid and FENE-P solution flow field information are analyzed, polymer shear degradation behaviors from macro flow to micro flow field are evaluated, and polymer shear degradation mechanisms are explained. The method provides a theoretical basis for optimization of polymer drag reducers in actual fluid turbulent flow transportation.