90 results about "Thermostability" patented technology

The application discloses a low-viscosity nitrogen-modified flame-retardant and smoke-suppressing silicone oil and a preparation method thereof, relates to the technical field of modified silicone oil, and the flame-retardant and smoke-suppressing silicone oil is obtained by ring-opening addition reaction of double-end epoxy silicone oil and methyl urea. The nitrogen-containing group is introduced into the polysiloxane molecule in a reactive form by adopting the chemical modification of methyl urea on the end epoxy silicone oil, so that the flame-retardant and smoke-suppressing performance and the thermal stability of the silicone oil are improved without significantly sacrificing the material fluidity. The obtained low-viscosity nitrogen-modified flame-retardant and smoke-suppressing silicone oil still maintains a good flow state at normal temperature, and is convenient to use in the modification of high polymer materials, the blending of composite systems and subsequent processing applications.

The invention provides a synthetic method of a novel flame retardant with a phosphaphenanthrene-chloropropyl synergistic structure. The preparation method comprises the following steps: synthesizing bis (1-chloro-2-propyl) phosphoryl chloride from phosphorus oxychloride and epoxypropane in a molar ratio of 1: 2 in a low-temperature condition through a micro-channel reactor, reacting with DOPO-HQ (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl-1, 4-benzenediol), adding a specific solvent and a catalyst, reacting to generate a crude product, filtering, washing, carrying out reduced pressure distillation, and recrystallizing to obtain the 2-(1-chloro-2-propyl) phosphoryl chloride, namely the 2-(1-chloro-2-propyl) phosphoryl chloride-DOPO-HQ (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl-1, 4-benzenediol). The novel flame retardant with the phosphaphenanthrene-chloropropyl synergistic structure is obtained. A phosphaphenanthrene-chloropropyl synergistic structure is designed, so that the molecular weight and the phosphorus content are improved, and the gas-phase flame-retardant and condensed carbon-forming synergistic flame-retardant effect is improved; the thermal stability and the molecular weight are improved through a molecular bridge chain (hydroquinone), and migration is inhibited. The flame retardant has excellent flame retardant property.

The invention relates to the technical field of bioengineering and environmental biology, and particularly discloses high-temperature-resistant polylactic acid depolymerases and application thereof in degradation of polylactic acid plastics. The nucleotide sequence of the coding gene of the high-temperature-resistant polylactic acid depolymerases B01 is as shown in SEQ ID NO: 1, and the amino acid sequence of the coding gene is as shown in SEQ ID NO: 2. The enzyme is derived from metagenome mining, the sequence similarity of the enzyme and the known PLA depolymerases PAM is only 34.45%, and the enzyme has remarkable novelty. According to the present invention, the secretory expression and the purification of the B01 are successfully achieved in the bacillus subtilis SCK6; an enzymatic property research shows that the optimal reaction temperature of the B01 is 65 DEG C, the half-life period at 60 DEG C is as long as 150 minutes, and the B01 shows excellent thermal stability; and the optimum pH value of the strain is 9.0. The invention provides a novel enzyme preparation with important application potential for high-temperature biological recovery treatment of PLA plastic waste.

The invention discloses a crystalline porous organic molecular framework material POM-OFPDT constructed by non-covalent pi accumulation as well as a preparation method and application of the crystalline porous organic molecular framework material POM-OFPDT. The crystalline porous organic molecular framework material POM-OFPDT constructed by non-covalent pi stacking provided by the invention has a capsule-shaped permanent one-dimensional pore channel in the a-axis direction, has good thermal stability, recyclability and high selectivity, and can effectively realize efficient separation of aromatic hydrocarbons / cycloalkanes.

The invention relates to the technical field of catalyst preparation and discloses a skeleton type iron-based molecular sieve as well as a preparation method and application thereof. The method comprises the following steps: (1) in the presence of a solvent, pre-reacting an Fe source, an M source and a zeolite molecular sieve, and drying to obtain a precursor; (2) calcining the precursor at the temperature of 500 DEG C or above for the first time, and then performing thermal modification in a hydrogen-containing atmosphere to obtain Fe / M seed crystal; and (3) mixing the Fe / M seed crystal with a silicon source, an aluminum source and a template agent, carrying out hydrothermal treatment, separating, drying, and carrying out secondary calcination at 500 DEG C or above to obtain the skeleton type iron-based molecular sieve. Through the synergistic effect of a hydrogen reduction seed crystal method and specific auxiliary metal, the skeleton type iron-based molecular sieve catalyst which has the denitration efficiency of 87% or above at the high temperature of 650 DEG C and has excellent cycle stability and high-temperature hydrothermal stability is successfully prepared.

The invention discloses a high-temperature-resistant degradable polypropylene bio-based composite material and a preparation method thereof, and relates to the technical field of degradable plastics. The preparation method comprises the following steps: by adopting PEG modified straw powder instead of conventional unmodified straw as a biomass filler, firstly soaking the straw powder in PEG, so that the straw powder interacts with cellulose / hemicellulose in the straw through hydrogen-bond interaction; and then carrying out heat treatment to promote a dehydration condensation reaction between PEG terminal hydroxyl groups and straw components to form stable chemical bonding, so that a heat-resistant protective layer is constructed on the surface of the straw, and a long-chain shielding effect is generated. Through modification, the thermal stability of the straw can be remarkably improved, the surface polarity is reduced, and the interfacial compatibility of the straw and a polypropylene matrix is enhanced, so that the mechanical property and the heat resistance of the composite material are remarkably improved, and the problems that the straw is poor in interface bonding and easy to thermally decompose in the polypropylene-based material are effectively solved. The method is simple in process, environmentally friendly and low in cost, and an efficient way is provided for high-value utilization of agricultural waste.

The invention belongs to the field of recycling of precious metal resources in environmental engineering, and particularly relates to a preparation method and application of an organic polymer sphere adsorbent. The amidoxime modified self-polymerized microporous polymer (AO-PIM-1) is prepared into the spherical adsorbent through a phase inversion method, and compared with other traditional adsorbents, the polymer sphere adsorbent is high in specific surface area and good in thermal stability and water stability and has a large number of functional groups with high combining capacity for Au ions. In a low-concentration Au solution, a good adsorption effect and excellent adsorption selectivity are still kept, and Au ions in electronic waste leachate can be well adsorbed and recycled.

The invention discloses a long-side-chain internal-plastic toughened polyurethane elastomer as well as a synthesis method and application thereof, and belongs to the technical field of high-performance elastomers. According to the invention, a long side chain toughening element is introduced as a cohesive reinforcing unit, binary hydrazide is adopted as a chain extender for cooperation, and the long side chain toughening element reacts with an isocyanate prepolymer to construct a strong hydrogen bond cross-linked polymerization network. The structure integrates the processability / stretchability / low temperature resistance of the flexible chain segment and the high toughness / thermal stability / chemical resistance of the long side chain toughening element. By regulating and controlling the component proportion of the soft chain segment, the stretchability and mechanical toughness of the material can be balanced and rejected, so that high Td and chemical resistance are maintained, and on the premise of not reducing the modulus and tensile strength of the material, the low-temperature toughness is improved, the combination of rigidity and toughness is realized, and the defect of insufficient toughness of the existing commercially available polyurethane elastomer is overcome.

This invention relates to engineered plastic-degrading enzymes with improved functional features. In particular, modified PETases capable of hydrolysis of PET or polyethelene terephthalate plastic polymer are disclosed herein. These engineered PETases contain one or more amino acid modifications at specified residue or residues, for example, N233, and exhibit improved enzymatic activity as well as therrnostability.

The invention discloses a radiation-resistant sealing composition based on an end-group functionalized elastomer as well as a preparation method and application of the radiation-resistant sealing composition, and belongs to the technical field of high polymer materials and radiation protection. The composition comprises the following components in parts by weight: 100 parts of an end group functionalized elastomer, 15-60 parts of a radiation-resistant filler, 1-8 parts of a cross-linking agent and 0.5-5 parts of a processing aid, wherein the end group functionalized elastomer is obtained by modifying hydroxyl-terminated polybutadiene or fluorinated elastomer by an end group modifier containing a naphthalene ring, an anthracene ring or a phenanthrene ring, and the radiation-resistant filler comprises a composite system of a radiation shielding filler and a free radical capturing filler. According to the invention, by combining the conjugated structure design at the molecular terminal with the synergistic effect of the composite filler, the sealing material keeps good processing and mechanical properties, and the high-dose irradiation resistance, thermal stability and compression permanent deformation resistance are remarkably improved; the sealing device is particularly suitable for sealing systems in high-end fields such as nuclear reactors, spacecrafts and medical equipment.

The invention relates to the field of chemical engineering, in particular to a bio-based hindered phenol antioxidant and a preparation method thereof. According to the bio-based hindered phenol antioxidant provided by the invention, a tert-butyl group with relatively large steric hindrance is arranged at the ortho-position of a hydroxyl group, a linear alkyl group (C15H31-) is arranged on a benzene ring, and the tert-butyl group and the linear alkyl group jointly regulate and control the activity of a phenolic hydroxyl group, so that the bio-based hindered phenol antioxidant has very good solubility in a non-polar medium (such as polyolefin plastics as polyethylene PE, polypropylene PP and the like); the compatibility is improved, volatilization and migration precipitation are reduced, and the thermal stability and the antioxidant activity are greatly improved. Moreover, the adopted raw material cardanol is a bio-based material and is safe and environment-friendly, and the preparation method is simple and easy to implement, mild in condition and beneficial to large-scale production.

This invention relates to the field of polymer degradable materials technology, specifically to a biodegradable material, its preparation method, and its applications. The material is based on modified polylactic acid (PLA), supplemented by antioxidants, plasticizers, flame retardants, and inorganic fillers in specific weight proportions. Its unique feature lies in the polymerization of lactic acid and epicatechin imidazole ammonium chloride polymer under stannous octoate catalysis, using chemical bonding to introduce the bioactive groups of epicatechin into the PLA backbone, significantly improving the material's biodegradation rate, mechanical properties, and thermal stability. The bioactive substances and ionic groups in this material promote microbial degradation, achieving complete decomposition in a composting environment within a short time. Simultaneously, through molecular-level reinforcement and ionic cross-linking effects, the strength, toughness, and high-temperature processing performance of PLA are effectively improved. This material can be widely used in disposable tableware, food packaging films, and biodegradable agricultural mulch films.

The invention belongs to the field of biotechnology and enzymology, and particularly relates to a thermostable variant of MDH and application thereof. The amino acid sequence of the mutant is shown as any one of SEQ ID NO: 1 to SEQ ID NO: 23. The catalyst has a normal MDH catalysis function and shows high temperature stability. The thermal stability variant of MDH provided by the invention can be used for replacing traditional MDH to be applied to clinical diagnostic reagents, cold-chain transportation and low-temperature storage are avoided, the cost is reduced, and the shelf life is prolonged.

ABSTRACT CORROSION-RESISTANT COATING COMPOSITION AND THE METHOD OF PREPARATION THEREOF The present invention relates to a corrosion-resistant coating composition and a method for preparing and applying the same for corrosion protection of metallic substrates under aggressive acidic and high-temperature environments. The boron-integrated phthalonitrile coating exhibits improved resistance to acid-induced degradation while retaining the inherent thermal stability and chemical robustness of phthalonitrile polymers. The invention provides a simple, catalyst-free, and scalable coating system suitable for corrosion protection of substrates exposed to harsh chemical and thermal conditions in industrial applications Fig. 1

The invention relates to the technical field of cable materials, in particular to a low-smoke halogen-free flame-retardant power cable material and a preparation method thereof, and the low-smoke halogen-free flame-retardant power cable material comprises the following raw materials: ethylene-vinyl acetate, low-phosphorus grafted polyvinylidene fluoride, metal hydroxide, microencapsulated ammonium polyphosphate, zinc stearate, tetra [beta-(3, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3 2, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester and polyolefin elastomer grafted maleic anhydride are used as raw materials. According to the low-phosphorus grafted polyvinylidene fluoride, a phosphate group is introduced to a polymer main chain, so that the polarity and interfacial activity of a matrix are enhanced, stable interface bonding with other components can be formed in the processing and combustion process, the dispersity and synergism of flame-retardant components are improved, and migration and precipitation phenomena are reduced; the microencapsulated ammonium polyphosphate effectively inhibits moisture absorption and water sensitivity of the ammonium polyphosphate, and the processing thermal stability is improved; and during combustion, the microcapsule shell layer can enhance the heat insulation and oxygen isolation capability, inhibit generation of toxic smoke and improve the flame retardant efficiency.

The invention provides modified silicon dioxide enhanced photosensitive resin and a preparation method and application thereof, and the modified silicon dioxide enhanced photosensitive resin comprises the following components in parts by weight: 40-70 parts of polyurethane acrylate containing large-steric-hindrance urea bonds; 20 to 40 parts of a reaction diluent; 0.5 to 5 parts of a photoinitiator; and 1-15 parts of silicon dioxide nanoparticles modified with hydroxyl or carboxyl. According to the modified silicon dioxide enhanced photosensitive resin provided by the invention, hydroxyl or carboxyl is modified on the surface of silicon dioxide, and silicon dioxide plays roles of a chain extender and a functional filler at the same time, so that the mechanical property and thermal stability of the photosensitive resin can be remarkably improved.

The invention relates to the technical field of molecular sieve modification, denitration catalysts and ship tail gas denitration treatment, in particular to a modified Fe-ZSM-5 denitration catalyst with high low-temperature denitration activity as well as a preparation method and application of the modified Fe-ZSM-5 denitration catalyst. According to the preparation method, a silicotungstic acid solution is added into a Fe-ZSM-5 suspension to prepare gel, so that silicotungstic acid is loaded on the surface of a Fe-ZSM-5 molecular sieve; and then carrying out high-temperature calcination to form Fe2 (WO3) 3 on the surface of the molecular sieve so as to prepare the silicotungstic acid modified Fe-ZSM-5 molecular sieve material. The modified Fe-ZSM-5 denitration catalyst is used as a selective catalytic reduction denitration catalyst, the NOx conversion rate at 210 DEG C is maintained at 90% or above, the denitration rate at 225 DEG C can reach 100%, and the modified Fe-ZSM-5 denitration catalyst has the advantages of being high in low-temperature denitration activity, wide in active temperature window, high in sulfur poisoning resistance and excellent in thermal stability, is applied to ship tail gas denitration treatment and has a very good application prospect.

This invention discloses a biodegradable breathable membrane and its preparation method, belonging to the field of thin film materials. The breathable membrane comprises, by weight, 60 parts modified polylactic acid, 12 parts modified natural cellulose, 1.5 parts plasticizer, 3.5 parts compatibilizer, 1 part lubricant, 0.1-2 parts calcium stearate, and 0.5-5 parts microgel particles. The microgel particles can be pre-crosslinked calcium alginate microgel particles, calcium-aluminum ion gradient crosslinked microgel particles, or pore-controlled calcium-aluminum ion gradient crosslinked microgel particles. Through the synergistic effect of calcium stearate and specific microgel particles, this membrane significantly improves its thermal stability, resistance to damp heat aging, and durability under harsh environments while ensuring the material's biodegradability, breathability, and antibacterial and oxygen-barrier functions. The preparation method includes steps such as raw material mixing, melt blending and granulation, and blow molding, which is simple and suitable for large-scale production.

The invention belongs to the technical field of degradable mulching films, and relates to a biodegradable mulching film as well as a preparation method and application thereof, and the biodegradable mulching film is prepared from oxidized starch, hydroxymethyl cellulose, trehalose, polyvinyl alcohol and a plasticizer. According to the invention, natural and synthetic biological materials are compounded, so that the water resistance, thermal stability, tensile property and the like of the mulching film are improved; starch and cellulose are used as main materials, so that resource utilization of agricultural wastes is realized, and the preparation cost is reduced; after degradation, nutrient substances necessary for life activity are provided for soil microorganisms to promote reproduction, and the soil structure is improved; environmental pollution caused by the plastic mulching film is reduced, and agricultural sustainable development is facilitated; the preparation operation is simple, the whole process is normal temperature and normal pressure, liquid is converted into a solid film at normal temperature, and the safety is high.

This invention relates to engineered plastic-degrading enzymes with improved functional features. In particular, modified PETases capable of hydrolysis of PET or polyethelene terephthalate plastic polymer are disclosed herein. These engineered PETases contain one or more amino acid modifications at specified residue or residues, for example, N233, and exhibit improved enzymatic activity as well as thermostability.

The present application relates to the field of genetic engineering and PET plastic degradation, and particularly relates to a PET degrading enzyme mutant based on hot spring metagenome and application thereof. Based on the sequence of TsmPETase from hot spring metagenome, multiple mutants Mut1-4 with excellent performance under high temperature conditions are obtained through random mutation, and the amino acid sequences are shown as SEQ ID No. 3-6 in sequence. The mutants are significantly superior to the original enzyme in terms of thermal stability and / or specific activity, and show good degradation effect on single and mixed PET plastic waste, thereby providing more efficient and stable enzyme preparation selection for biodegradation of PET.

The application discloses a PC / PBT modified plastic and a preparation method thereof in the technical field of modified plastics, and comprises the following components in parts by weight: polycarbonate (PC) 70-80 parts, maleic anhydride modified polybutylene terephthalate (maleic anhydride modified PBT) 20-30 parts and reinforcing agent 15-20 parts. The application provides high strength and thermal stability through PC, improves the rigidity and dimensional stability of the material through PBT, disperses the reinforcing agent in the phase interface to form a "soft phase toughening" area, absorbs impact energy, prevents crack propagation, forms a chemical bond crosslinking structure through multiple reaction sites, and further improves the impact performance and heat resistance.

The present application relates to a kind of flame-retardant porous adsorbent, preparation method and its application.The preparation method of the flame-retardant porous adsorbent is simple, high in mechanical strength, strong in water heat stability, with good volatile organic compound adsorption performance, long service life and the like.

This invention discloses a method for preparing a wall-mounted magnetic nanoparticle-immobilized enzyme microreactor. The method first involves encapsulating Fe3O4 nanoparticles with polydopamine. Utilizing the self-polymerization properties of dopamine, a uniform polydopamine coating layer rich in active groups is formed on the surface of the Fe3O4 nanoparticles. This provides a high-density reaction site for subsequent activation with a silanizing agent (3-aminopropyltriethoxysilane, APTES) and cross-linking with glutaraldehyde (GA). Subsequently, through multi-level surface functionalization modification involving 3-aminopropyltriethoxysilane activation and glutaraldehyde cross-linking, efficient and stable immobilization of CALB is achieved, while simultaneously endowing the immobilized enzyme with excellent magnetic separation performance, thermal stability, and storage stability. This invention features a simple process, easy operation, and easy recovery.

The invention belongs to the technical field of polymer electrolyte and electrochemical energy storage, and particularly relates to a preparation method of an intrinsic flame-retardant solid electrolyte, the prepared solid electrolyte and application of the intrinsic flame-retardant solid electrolyte. An aziridine ring-containing monomer, a flame-retardant group-containing functional monomer and an epoxy compound are used as copolymerization precursors, lithium (sodium / potassium) salt is used as an initiator, and the intrinsic flame-retardant solid electrolyte is prepared. And a quasi-solid electrolyte network with ionic conduction and intrinsic flame-retardant functions is constructed in the battery through in-situ cross-linking polymerization. According to the design, a flame-retardant structural unit becomes a constituent part of a polymer network in a chemical bonding manner instead of physical addition, so that effective coating and flame-retardant protection of residual organic solvent molecules in a system are realized. The electrolyte system has excellent thermal stability and active fireproof safety while keeping high ion transmission capability.

This invention discloses a broad-spectrum polyester hydrolase with wide temperature adaptability and its applications, belonging to the fields of enzyme engineering and biocatalysis. Compared to the wild type, the polyester hydrolase mutant provided by this invention exhibits significantly improved catalytic performance, excellent thermal stability, and strong temperature adaptability, demonstrating good activity across a temperature range of 20-60 °C. It also possesses a broad substrate spectrum, showing good hydrolytic ability not only for PBAT but also for PET and PLLA. This provides a high-performance enzyme catalyst for biodegradable plastics treatment, mixed polyester recycling, and green chemical processes, demonstrating outstanding industrial application prospects. It can be used in fields such as biodegradable plastics, polyester recycling, and green chemical processes.