22 results about "Hydrolytic degradation" patented technology

The invention belongs to the technical field of PBT plastic particle injection molding, and particularly relates to a precise injection molding process control system for PBT plastic particles. The control system is composed of the following modules: a material characteristic sensing and modeling module, a multi-physical field simulation and parameter generation module, a distributed optical fiber global sensing module, a predictive closed-loop control module, and a digital twinning and full-period optimization module. The material characteristic sensing and modeling module is used for acquiring microscopic parameters of PBT raw materials through a near infrared spectrum sensor and constructing a material characteristic dynamic model; raw material characteristic fluctuation is pre-judged through near infrared spectrum dynamic modeling, technological parameter drift is predicted in advance in combination with an LSTM neural network, and feed-forward compensation is started before deviation is formed; compared with post correction in the prior art, the mechanism has the advantages that the parameter fluctuation control precision is improved, and the prevention efficiency for the problems of hydrolytic degradation, internal stress concentration and the like which are prone to occurring in PBT is improved.

This disclosure generally relates to the design of renewably sourced, readily degradable pressure-sensitive adhesives (PSAs) that exhibit tunable adhesion properties is beneficial to address sustainability concerns associated with traditional, fossil fuel-derived counterparts. More generally, aliphatic polyester triblock copolymers of poly(L-lactide)-block-poly(γ-methyl-ε-caprolactone)- blockpoly(L-lactide) (LML) and blends with renewable tackifier in PSA formulations are discussed. More particularly, effects of tackifier, composition, and processing history on microstructural, thermal, mechanical, and adhesive properties of the PSAs are disclosed. Specifically, LML-based PSAs are hydrolytically degradable into water soluble or dispersible compounds at 45°C under basic conditions within 30 days, offering a sustainable end-of-life scenario via its potential in composting makes for an ideal and sustainable alternative for commercial acrylic incumbents.

The invention discloses a tolvaptan sodium phosphate freeze-dried composition for injection and a preparation method of the tolvaptan sodium phosphate freeze-dried composition. The composition comprises tolvaptan sodium phosphate, tromethamine, disodium hydrogen phosphate and sodium dihydrogen phosphate, the molar ratio of the tolvaptan sodium phosphate to the tromethamine to the disodium hydrogen phosphate to the sodium dihydrogen phosphate is 1: (1.5-3.5): (2-4): (0.05-0.15). According to the invention, tromethamine is creatively adopted to replace cane sugar in the prior art to be used as a freeze-drying protective agent and a skeleton forming agent, so that the safety risks of high permeability, kidney burden, production pollution and the like possibly caused by the cane sugar are solved. In combination with a specific freeze-drying process comprising a pre-freeze-thawing step, the moisture content of the freeze-dried composition prepared by the invention can be lower than 0.3%, a stable freeze-dried cake-shaped structure is formed, and hydrolytic degradation of a main drug is effectively inhibited. Compared with the prior art, the composition provided by the invention has the beneficial effects of high safety, good stability and excellent product appearance.

This invention belongs to the field of biodegradable materials and discloses a recyclable and hydrolytically degradable polyurethane-like glass, its preparation method, and its applications. The preparation method includes: dispersing a macromolecular diol, a B-N internally coordinated cyclic boron ester diol, a small molecule polyol, and a diisocyanate in a polar solvent; mixing and adding a catalyst to carry out a polymerization reaction; followed by a curing reaction and solvent removal to obtain the recyclable and hydrolytically degradable polyurethane-like glass. The polyurethane-like glass prepared by this invention contains stable boron ester dynamic covalent bonds. Under certain stimulating conditions, the material can be reshaped, degraded, and recycled through the breaking and recombination of boron esters. Therefore, it can not only achieve the reshaping of thermosetting polyurethane under mild conditions but also achieve hydrolytic recycling under relatively mild conditions without a catalyst, thus having high value for the complete recycling of resin-based composite materials.

The invention discloses a hydrolysis degradation damage assessment method and system for mine laneway fracture surrounding rock, and the method comprises the following steps: S1, surrounding rock sample collection and characterization, S2, high-frequency variable-amplitude hydrolysis and mechanical coupling test design, S3, macro-micro data synchronous collection, S4, hydrolysis degradation damage quantitative modeling, and S5, damage grade assessment and prediction. A high-frequency variable-amplitude hydrolysis-static confining pressure-dynamic impact load coupling loading platform is constructed, and through linkage control of a high-frequency variable-amplitude water-rock circulation system, a rock mechanics test system and an SHPB system, complex actual working conditions of high-frequency variable-amplitude water level + protolith static load + impact disturbance in scenes such as a reservoir under a pumped storage power station rebuilt by an abandoned mine are accurately simulated. The problem of damage risk underestimation caused by disjunction of a test environment and an actual working condition is avoided by adjusting key parameters such as the water pressure amplitude, the cycle frequency and the fracture inclination angle, and a reliable test basis is provided for evaluation of a high-risk scene.

The utility model discloses a high-temperature-resistant composite soft can packaging bag, which relates to the technical field of packaging bags and comprises a bag body, the bag body is sealed by a heat sealing edge and is made of a composite film, and the composite film sequentially comprises a polyester film layer, an aluminum foil layer, a nylon film layer and a polypropylene composite film layer from outside to inside. The polyester film layer, the aluminum foil layer, the nylon film layer and the polypropylene composite film layer are arranged, the aluminum foil layer forms a barrier foundation, oxygen, water vapor, light and peculiar smell can be absolutely isolated, and the nylon film layer and the polypropylene composite film layer are connected through the modified polypropylene adhesive. Therefore, the defect that a traditional polyurethane adhesive is easy to hydrolyze and degrade is overcome, layering and air leakage risks are completely eradicated, the nylon film layer has excellent toughness and impact resistance, the firm interface, the strength of the polyester film layer, the rigidity of the aluminum foil layer and the flexibility of the polypropylene composite film layer are combined into a firm whole, and the puncture resistance of the packaging bag is greatly improved.

A packaging system for the storage of an ophthalmic device is disclosed. The packaging system includes a sealed container containing one or more unused ophthalmic devices immersed in an aqueous packaging solution that includes one or more conjugated glycosaminoglycans having a polymer backbone having a reactive functional moiety conjugated to an amine group having one or more moieties that inhibit and / or prevent one or more of oxidation and hydrolytic degradation of the polymer backbone during use in the eye; wherein the aqueous packaging solution has an osmolality of at least about 150 mOsm / kg, a pH of about 6 to about 9 and is sterilized.

The invention provides a confinement conductive composite membrane, a preparation method thereof and an electrochemical method for in-situ hydrolysis of extracellular polymeric substances based on the confinement conductive composite membrane, and relates to the technical field of sewage treatment. The confinement conductive composite membrane comprises an ultrafiltration membrane carrier and a conductive layer formed on the surface of the ultrafiltration membrane carrier, the conductive layer is made of a carbon nano tube material, and at least one of nano Ni, Co, Fe and Mo catalysts is selectively loaded on the inner wall of a hollow tube or between two-dimensional layers of the carbon nano tube material. The structure effectively prevents agglomeration and loss of the catalyst through a confinement effect, and the dispersity and stability of the catalyst are improved; meanwhile, a continuous conductive network formed by the carbon nanotubes has excellent electron transmission capability, and electrons can be quickly transmitted to catalytic active sites. When the composite membrane is used as a cathode to work, the loaded nano-metal catalyst can remarkably reduce the overpotential of hydrogen evolution reaction, an interface can be induced to construct an alkaline microenvironment in situ under low voltage, and EPS attached to the surface of the membrane is promoted to be hydrolyzed and degraded.

This invention provides a confined conductive composite membrane, its preparation method, and an electrochemical method for in-situ hydrolysis of extracellular polymeric substances (EPS) based thereon, relating to the field of wastewater treatment technology. The confined conductive composite membrane comprises an ultrafiltration membrane carrier and a conductive layer formed on its surface. The conductive layer is composed of carbon nanotubes, with at least one of nano-Ni, Co, Fe, and Mo catalysts selectively loaded onto the inner wall of the hollow tubes or between the two-dimensional layers. This structure effectively prevents catalyst aggregation and loss through the confinement effect, improving the catalyst's dispersibility and stability. Simultaneously, the continuous conductive network formed by the carbon nanotubes possesses excellent electron transport capabilities, enabling rapid electron transfer to the catalytically active sites. When the composite membrane of this application operates as a cathode, the loaded nano-metal catalyst significantly reduces the overpotential of the hydrogen evolution reaction, inducing the in-situ construction of an alkaline microenvironment at low voltage, promoting the hydrolytic degradation of EPS attached to the membrane surface.

The application discloses an anti-floating anchor rod and waterproof layer integrated construction method, and belongs to the technical field of underground engineering rock soil anchoring; in view of the pain points that the anti-corrosion coating is easily scratched during construction, the free section isolation layer forms a permanent weak interface, and the traditional degradable material is unreliable in microbial degradation, the application coats the anchor rod with an anti-corrosion primer, and only in the free section, a hydrolyzable degradable fiber braided sleeve bag filled with buffer dry powder is worn, and the anchoring section is directly grouted. The sleeve bag is made of polyglycolic acid and poly (lactic acid-co-glycolic acid) blended fiber, the dry powder contains river sand, fly ash, a small amount of cement and an alkaline hydrolysis accelerator, and the controllable hydrolysis of 12-24 months is realized through internal and external double-alkali triggering; the application buffers and protects the coating during construction, forms a non-Newtonian fluid to absorb energy and reduce vibration during use, completely eliminates the organic interface after degradation, the anchoring section is not affected by the uplift capacity, the free section realizes long-acting waterproof and corrosion protection, the comprehensive cost is low, the construction is simple, and the application meets the current specification requirements.

A hydrogel is provided comprising a first polymer, a second polymer, and a crosslinker. The first polymer comprises at least one ester-containing moiety and at least one first crosslinking moiety. The second polymer comprises at least one amide-containing moiety and at least one second crosslinking moiety. The crosslinker is covalently bound to the first polymer and the second polymer via the first crosslinking moiety and the second crosslinking moiety. Articles formed from the hydrogel as well as methods of use are also described.

The invention relates to the technical field of composite current collectors, in particular to a composite current collector and a preparation method thereof, an electrode plate, a battery and an electric device, and the composite current collector comprises a polyester matrix layer and a conductive layer arranged on at least one surface of the polyester matrix layer; the polyester matrix layer is prepared from the following components in parts by mass: 40 to 65 parts of polyester, 20 to 50 parts of metal material, 5 to 15 parts of filler, 3 to 8 parts of compatilizer, 0.5 to 3 parts of hydrolysis stabilizer and 0.1 to 1 part of antioxidant; the hydrolysis stabilizer comprises an oligomer containing an epoxy group and an oligomer containing a carbodiimide group. According to the composite current collector provided by the invention, the binding force between the base material and the conductive layer is improved, the hydrolytic degradation process of the polyester matrix layer in an electrolyte environment is inhibited, and the mechanical property of the composite current collector is improved.

Disclosed herein are self-fortifying hydrophobic polymer systems including a crosslinked epoxidized lipid / epoxidized-alkoxysilane network. The systems have improved resistance to hydrolytic degradation relative to other polymer systems.

The invention discloses a preparation method of an imitated oral solution for lactulose Dumishan. The preparation method comprises the following steps: step 1, pretreating raw materials; 2, preparing a buffer system; step 3, dissolving and mixing core components; step 4, adjusting flavor and optimizing taste; step 5, osmotic pressure regulation; step 6; step 7, carrying out sterile treatment; step 8, constant-temperature curing and stability regulation and control; and step 9, quality detection and packaging. According to the invention, beta-cyclodextrin is adopted to carry out clathration treatment on lactulose, and the composite wall material can effectively protect the molecular structure of lactulose, so that the lactulose is prevented from being hydrolyzed and degraded in the preparation and storage processes; meanwhile, a citric acid-sodium citrate composite buffer pair and EDTA disodium have a synergistic effect, so that the pH value of the system is stabilized, metal ions are chelated, the degradation of lactulose is further inhibited, and the validity period of the preparation is prolonged. The sweetness is adjusted through the sucralose and maltitol compound sweetening agent, and the sweet greasy feeling of a single sweetening agent is avoided.

The invention relates to a method and a structure for improving adhesive force of a glass substrate fine metal mask (GS-FMM) and an organic metal mask (GS-OMM) in an organic light emitting diode (OLED) process. The innovative technique deposits one or more interfacial bonding layers (IBLs) between the glass substrate and the metal layer. The interfacial bonding layer (IBL) is selected from a metal oxide, nitride or oxynitride and forms a covalent or ionic bond with the glass and the upper metal to ensure long-lasting adhesion. In addition, IBL provides hydrolytic degradation resistance, and the long-term stability of the mask in multiple cleaning and thermal cycle processes is improved. The coefficient of thermal expansion (CTE) of the IBL is lower than 15 ppm / DEG C, and thermal stress can be reduced in the OLED manufacturing process. According to the invention, the adhesion performance, the process stability and the durability of high-precision OLED display are ensured.

The invention discloses a controllably degradable polyglycolic acid copolymer and a preparation method thereof, and belongs to the technical field of high-molecular compounds obtained by reaction except for carbon-carbon unsaturated bonds and hydrolysis degradation modification of biodegradable polyester intrinsic. The polyglycolic acid copolymer is an A-B or A-B-A or B-A-B block copolymer; the block A is a cyclic ester polymer chain segment, and the block B is a polyglycolic acid chain segment. The preparation method comprises the following steps: performing ring-opening polymerization on a cyclic ester monomer or glycolide, a catalyst and an initiator to obtain a prepolymer; carrying out ring opening polymerization on the prepolymer, glycolide or cyclic ester monomer and a catalyst, and fully reacting to obtain a controllably degradable polyglycolic acid copolymer; and purifying and drying the polyglycolic acid copolymer. According to the invention, the hydrophobic monomer is introduced to inhibit the hydrolytic degradation of polyglycolic acid; the degradation of the material is regulated and controlled by adjusting the monomer introduction amount and the hydrophobic chain length; the intrinsic modification has no obvious negative effect on the processing property and the mechanical property of the polyester material, and meanwhile, the elongation at break of the material is greatly improved.

Provided are polymers with one or more domains. At least one domain of the polymer is zwitterionic. The zwitterionic domain may be a polyphosphazene having one or more HEPES-based groups. In various examples, the polymer is zwitterionic. The repeat unit in polyphosphazenes has the following general formula:where n is an integer. Each R may be the same or different. The pendant groups are also referred to herein as R and R′. At least one of the zwitterionic group may have the following structure:or a protonated or deprotonated form thereof. Also provided are methods of making and using the polymers of the present disclosure.

The invention relates to the technical field of high polymer materials, and discloses a full-biodegradable bamboo-based material, a preparation method and application thereof, and the material is prepared from bamboo powder, citric acid, pentaerythritol, epoxidized soybean oil, ionic liquid, polylactic acid, poly (butylene succinate), poly (butylene adipate terephthalate) and other auxiliaries. According to the preparation method, an ionic liquid assisted in-situ reaction system is adopted, a hydrophobic modification layer with a hyperbranched structure is constructed on the surface of the bamboo powder, a step-by-step process strategy of modification dehydration and low-temperature blending is adopted, water generated by reaction is removed through high-temperature vacuum dehydration before matrix resin is introduced, and hydrolytic degradation of a polyester matrix is effectively inhibited. According to the invention, the material is endowed with excellent dry fluidity, and granulation-free one-step direct extrusion molding is realized. The obtained material has interface toughness, rheological property and water resistance under high filling amount, solves the problems of high brittleness and difficult processing of the existing bamboo-plastic material, and is suitable for production of hollow corrugated boards and woven bags.

A packaging system for the storage of an ophthalmic device is disclosed. The packaging system includes a sealed container containing one or more unused ophthalmic devices immersed in an aqueous packaging solution that includes one or more conjugated glycosaminoglycans having a polymer backbone having a reactive functional moiety conjugated to an amine group having one or more moieties that inhibit and / or prevent one or more of oxidation and hydrolytic degradation of the polymer backbone during use in the eye; wherein the aqueous packaging solution has an osmolality of at least about 150 mOsm / kg, a pH of about 6 to about 9 and is sterilized.

The invention belongs to the technical field of functional terraces, and provides a super-wear-resistant, anti-rolling, anti-corrosion, anti-skid, fireproof and high-temperature-resistant terrace and a preparation method thereof. The method disclosed by the invention comprises the following steps: checking the flatness of the ground: repairing cracks and concave parts of the ground by adopting putty, wherein the putty comprises fluorosilicone resin coating and filler; a flat ground is sequentially subjected to blade coating of the bottom layer coating, coating of the middle layer coating and coating of the surface layer coating, and the super-wear-resistant anti-rolling anti-corrosion anti-skid fireproof high-temperature-resistant floor is obtained. By means of the method, the terrace with the multifunctional characteristics of super wear resistance, rolling resistance, corrosion resistance, skid resistance, fire prevention, high temperature resistance and the like can be obtained, the defects that an existing general coating is low in mechanical strength, short in service life, prone to hydrolytic degradation in a humid environment, not resistant to wear and the like are overcome, and compared with an existing terrace product, the terrace is longer in service life and lower in cost. And no stripping within ten years is ensured.

A biodegradable polymer usable in fishing gear and that biodegrades in aquatic environments. The polymer includes a polymer backbone that has monomeric units that are susceptible to hydrolytic degradation, and a plurality of pH responsive moieties. Each pH responsive moiety is grafted to a respective one of the monomeric units. The pH responsive moieties are relatively hydrophilic when exposed to an aqueous solution of a pro-biodegradation pH range to facilitate hydrolytic degradation of the monomeric units, and are relatively hydrophobic when removed from the aqueous solution of the pro-biodegradation pH range, to protect the monomeric units from hydrolytic degradation.

The application relates to the technical field of high polymer materials, and discloses a full-biodegradable bamboo-based material, a preparation method and application of the material, which is prepared from bamboo powder, citric acid, monopentaerythritol, epoxy soybean oil, ionic liquid, polylactic acid, polybutylene succinate, polybutylene terephthalate and other additives. The preparation method adopts an ionic liquid assisted in-situ reaction system, constructs a hydrophobic modified layer with a hyperbranched structure on the surface of the bamboo powder, and adopts a modified dehydration-low temperature blending step-by-step process strategy, removes reaction generated water through high temperature vacuum dehydration before the introduction of a base resin, and effectively inhibits the hydrolytic degradation of the polyester base. The application endows the material with excellent dry flowability, and realizes one-step direct extrusion molding without granulation. The obtained material has interface toughness, rheological performance and water resistance under high filling amount, solves the problems of large brittleness and difficult processing of existing bamboo plastic materials, and is suitable for the production of hollow corrugated boards and woven bags.