239 results about "Thermostability" patented technology

The invention belongs to the field of environment-friendly materials, and particularly discloses a method for preparing a high-performance exterior wall flame-retardant material from waste plastics. Through a unique formula, for example, waste polyethersulfone and the like are used as base materials, a waste basalt fiber and MOF derived carbon nanosheet composite reinforced phase, multiple novel flame retardants and the like are added, and innovative processes including pulsed electric field treatment, carbon dioxide supercritical fluid assistance and the like are combined, so that the material performance is remarkably improved. The tensile strength, the thermal stability, the flame retardant property and the like of the material are greatly enhanced, the material also has multiple functions of flexibility, self-cleaning, antibiosis and the like, and a new way is provided for high-value utilization of waste plastics and performance optimization of exterior wall materials.

The invention discloses a PBAT (poly (butylene adipate-co-terephthalate)) composite material containing nano encapsulation enzyme as well as a preparation method and application thereof. The PBAT composite material is prepared from the following components in percentage by mass: 50 to 90 parts of PBAT resin, 0 to 40 parts of filler and 0.01 to 20 parts of nano encapsulation enzyme. The preparation method comprises the following steps: firstly synthesizing the nano encapsulation enzyme, and then mixing the nano encapsulation enzyme, the PBAT resin and the filler, extruding, and carrying out hot press molding or curtain coating and film blowing. The method is characterized in that 1) the nano encapsulated enzyme has more excellent thermal stability than other immobilized enzymes, and the biological activity of the enzyme can be effectively maintained after high-temperature heat treatment; and 2) as the biological activity of the enzyme is effectively reserved, the PBAT composite material containing the nano encapsulated enzyme has higher environmental degradation speed than pure PBAT or a PBAT composite material containing free enzyme, and the environmental degradation speed can be reflected in various conditions such as aqueous solution and industrial compost.

The invention discloses a preparation method of a flame-retardant anti-aging polyolefin plastic, and belongs to the technical field of polyolefin material processing.The preparation method comprises the steps that a modified anti-aging agent is mixed with a DOPO-based flame retardant modified by introducing isocyanate and epoxy groups, the mixture is added into a polyolefin material, during combustion, carbon formation is promoted by the phosphorus element, and the flame-retardant anti-aging polyolefin plastic is obtained. The flame retardant and nitrogen element synergistically play a flame-retardant role, meanwhile, epoxy groups in the flame retardant and carboxyl of polypropylene are subjected to a ring-opening reaction, the crosslinking degree of the material is enhanced, the modified anti-aging agent can effectively capture free radicals and inhibit oxidative degradation, and the mechanical strength and flame-retardant effect of the material are improved. According to the modification method, the anti-aging, high-temperature-resistant and flame-retardant properties of the polyolefin plastic are remarkably improved, the stability of the polyolefin plastic in high-temperature and severe environments is enhanced, the service life is prolonged, and the mechanical property and the thermal stability of the polyolefin plastic are improved.

The present invention belongs to the field of enzyme engineering technology, and specifically relates to a plastic hydrolase ThPETase mutant and its application, wherein the plastic hydrolase ThPETase mutant is obtained by multiple mutations in the 48th, 204th, 213th, 214th and 253rd positions of the amino acid sequence shown in SEQ ID NO.1. The present invention performs molecular modification on the basis of the wild-type ThPETase. While the wild-type ThPETase has almost no hydrolysis activity for PBAT, the mutant obtained by the present invention has obvious hydrolysis ability for PBAT, and can hydrolyze a plastic film made of PBAT into powder in 2 weeks at 37°C. Moreover, the mutant obtained by the present invention has a significant improvement in thermal stability compared with the wild-type, and has great industrial application prospects.

The invention discloses a flame-retardant thermoplastic polyurethane elastomer material and a preparation method thereof, and belongs to the technical field of modified nano materials. The preparation method comprises the following steps: dissolving melamine, phytic acid and boron nitride in deionized water, carrying out oil bath, adding a coupling agent, stirring, carrying out vacuum filtration, washing with water, and drying to obtain a layered nano flame retardant; the preparation method comprises the following steps: dispersing a flame retardant in deionized water containing a nonionic dispersant, and carrying out ultrasonic treatment; the preparation method comprises the following steps: reacting polyether polyol with diisocyanate to obtain a primary prepolymer; adding other auxiliary agents, stirring, and carrying out gradient heating polymerization; and injecting into a mold, curing for 6-12 hours at 105-125 DEG C, and drying for 12-24 hours at 80-90 DEG C. A phosphorus-nitrogen-silicon ternary synergistic flame-retardant system is introduced, the boron nitride nanosheet surface grafting and dynamic pre-polymerization-gradient heating process is optimized, the dispersity is improved, and smoke suppression and thermal stability are achieved. Compared with the prior art, the flame retardant efficiency is high, the mechanical property is excellent, and environmental friendliness is achieved.

The invention relates to the technical field of heat-resistant materials, in particular to a heat-resistant polyethylene material and a preparation method thereof, and the heat-resistant polyethylene material comprises the following raw materials: ultra-high molecular weight polyethylene, zirconium oxide-zinc aluminate spinel (ZrO2-ZnAl2O4), modified graphdiyne, an antioxidant, a heat stabilizer, a plasticizer, a flame retardant and an anti-ultraviolet agent. The ultrahigh molecular weight polyethylene, the ZrO2-ZnAl2O4 and the modified graphdiyne play a role through a synergistic effect, a polyethylene molecular chain forms a firm three-dimensional network structure in a high-temperature radiation process, and a stable matrix supporting effect is provided; the excellent chemical stability and oxidation resistance of ZrO2-ZnAl2O4 in a high-temperature environment effectively inhibit the thermal degradation reaction of polyethylene, the service life of the material is prolonged, the modified graphdiyne is beneficial to rapid heat transmission, the thermal stability of the material is improved, meanwhile, the layered structure of the material has good lubricating performance, and the service life of the material is prolonged. The modified graphdiyne and the ZrO2-ZnAl2O4 are combined to avoid heat accumulation and material aging caused by the friction effect, and the ultrahigh molecular weight crosslinked polyethylene, the ZrO2-ZnAl2O4 and the modified graphdiyne form a multi-layer protection system to jointly improve the heat stability of the material.

The invention relates to the technical field of plastic films, in particular to a preparation method of an environment-friendly plastic bag, which comprises the following steps: S1, mixing polyethyleneimine, ammonium polyphosphate and a first solvent, then carrying out primary reaction, cooling to room temperature, filtering, washing and drying to obtain a solid-phase substance; s2, tannic acid and a second solvent are mixed, tris (hydroxymethyl) aminomethane is added, the pH is adjusted to 7-9, then hydrogen peroxide is added, after a secondary reaction, the solid-phase matter is added for a third reaction, filtering, washing and drying are conducted, and a heat-resistant enhancer is obtained; s3, the modified polylactic acid, the heat-resistant enhancer and the auxiliaries are put into a high-speed mixer to be mixed to be uniform, then the mixture is added into a double-screw extruder to be granulated, then film blowing is conducted through an air blower, and the environment-friendly plastic bag is obtained. The environment-friendly plastic bag provided by the invention has excellent mechanical properties, thermal stability and ultraviolet resistance.

The invention belongs to the field of environment-friendly materials, and relates to a waste plastic recycling method which comprises the following steps: designing a novel organic compound modifier, mixing with waste plastic and other auxiliaries, and treating by a specific process. According to the method, the performance, such as bending strength, tensile strength and thermal stability, of the regenerated material is remarkably improved, and an innovative approach is provided for efficient utilization of waste plastics.

The invention discloses a dsPETase01 plastic degrading enzyme mutant and application thereof, and relates to the technical field of bioengineering, the amino acid sequence of a wild type plastic degrading enzyme (dsPETase01) is designed and modified, 8 dsPETase01 single mutation sites or 19 combined mutation sites are provided, the thermal stability of the obtained dsPETase01 mutant is improved by about 4-21 DEG C compared with that of the wild type dsPETase01, and the dsPETase01 mutant can be used for preparing a plastic degrading enzyme. And the activity is improved by nearly 1.2-3 times. The invention also provides four preferable mutant proteins which have higher yield, activity and thermal stability compared with wild dsPETase01, have wider application conditions, are more suitable for degrading PET (Polyethylene Terephthalate) plastics, and are beneficial to large-scale production and industrial application.

The invention belongs to the field of environment-friendly materials, and relates to the field of waste plastic recycling, in particular to a method for recycling waste plastics through modification, and the waste plastics are converted into high-performance materials by introducing various novel organic compound modifiers such as CCPFT and MBPOT and combining a unique component formula and process. The method not only solves the problem of environmental pollution caused by waste plastics, but also improves the mechanical property, thermal stability, flame retardance, antibacterial property and the like of the regenerated material. Compared with the prior art, the regenerated material disclosed by the invention has the advantages that various properties are remarkably improved, efficient recovery and resource reutilization of waste plastics are realized, and the regenerated material has a wide application prospect.

The present invention relates to molecular sieves, in particular to a novel silicate zeolite molecular sieve ZMQ-1, and a preparation method and use thereof. The anhydrous chemical composition of the silicate zeolite molecular sieve precursor is SiO2·1 / xXO 1.5 mMO 0.5 ·qQ, where X is a framework trivalent element, Si / X molar ratio x≥5, M is a framework balancing cation, M / Si molar ratio 0≤m≤1, Q is a diquaternary ammonium or diquaternary phosphorus organic structure directing agent, Q / Si molar ratio q≥0.01. The anhydrous chemical composition of silicate zeolite molecular sieve is SiO2·1 / xXO 1.5 mMO 0.5 , wherein X is a framework trivalent element, Si / X molar ratio x≥5, M is a framework balanced cation, and M / Si molar ratio 0≤m≤1. The molecular sieve of the present invention can be further applied to energy storage, sensing, loading, adsorption, separation or catalysis processes due to its novel topological structure, unique pore system, and high thermal and hydrothermal stability, and may exhibit unique properties.

The invention discloses an IsPETase mutant with improved thermal stability and activity and application of the IsPETase mutant. According to the invention, a mutant TS-PETase of PET plastic degrading enzyme IsPETase is taken as a parent, and the IsPETase mutant with improved thermal stability and / or PET degrading activity is obtained by performing single-point mutation or combined mutation on amino acid at a specific site of the mutant TS-PETase. The obtained IsPETase mutant can be used for effectively degrading PET (Polyethylene Terephthalate) plastics under a Tg condition, and can also be prepared into a corresponding preparation for degrading the PET plastics accumulated in the environment and improving the environment polluted by the PET plastics. The obtained IsPETase mutant can also be used for degrading PET-containing plastic products and assisting in harmless treatment of plastics. The IsPETase mutant with improved thermal stability and activity, provided by the invention, has a promoting effect on the development of industrial biodegradation of PET (Polyethylene Terephthalate) plastics.

The present invention relates to novel esterases, more particularly to esterase variants having improved activity and / or improved thermostability compared to the esterase of SEQ ID NO: 1 and the uses thereof for degrading polyester containing material, such as plastic products. The esterases of the invention are particularly suited to degrade polyethylene terephthalate, and material containing polyethylene terephthalate.

The invention discloses a preparation method of modified thermostable polycaprolactone, and belongs to the technical field of high polymer materials. The method comprises the following steps: selecting branched monomers such as 3-methyl-epsilon-caprolactone, inhibiting molecular chain slippage through a side group steric effect, and improving chain rigidity; a super-crosslinking metalloporphyrin porous material catalyst is adopted; (3) introducing a light / heat reversible group to an end group; and (4) optimizing process conditions and narrowing molecular weight distribution. Experiments show that the modified PCL obtained by the method is high in thermal decomposition temperature, small in melt flow rate change rate, low in yellowing index and high in tensile strength, and the comprehensive performance of the modified PCL is far better than that of the modified PCL obtained by a traditional method. The material is suitable for the fields of medical instruments, intelligent packaging and the like, and has the characteristics of high thermal stability, rapid shape recovery and controllable degradation.

The invention provides ATP / CCS / SA-PEI aerogel as well as a preparation method and application thereof, attapulgite ATP, carboxylated chitosan CCS, polyethyleneimine PEI and sodium alginate SA are adopted as raw materials, and polymer modification and crosslinking are promoted through an ionic crosslinking method to form the aerogel. The preparation method comprises the following steps: firstly, adding a prepared CCS solution into an SA solution to obtain a CCS / SA solution; the preparation method comprises the following steps: adding a CCS solution into a reaction kettle, adding an ATP suspension, finally adding a PEI solution, uniformly mixing, pouring into a plastic mold, freeze-drying, cross-linking, washing with water, and freeze-drying again to obtain the ATP / CCS / SA-PEI aerogel. The aerogel prepared in the invention has the advantages of large specific surface area, many adsorption groups, good adsorption performance on dye pollutants and heavy metal ions, good thermal stability, reusability, and good application value in the removal of dye pollutants and heavy metal ions in sewage.

The invention relates to the field of processing aids and lubricants thereof, in particular to a plastic lubricant and a preparation method and application thereof.The preparation method comprises the following steps that firstly, dodecanedioic acid and pentaerythritol are added into a reaction kettle provided with a stirring device and a heating system; fully and uniformly mixing under the conditions that the temperature is 190-250 DEG C and the stirring speed is 300-500 revolutions per minute, so as to carry out dehydration esterification reaction, and continuously stirring until a chemical balancing state is achieved; and cooling to 150 DEG C, spraying powder and sieving to finally obtain the finished product plastic lubricant. The plastic lubricant disclosed by the invention can keep excellent lubricating property in a high-temperature environment, effectively reduce the viscosity of a plastic melt and remarkably improve the fluidity. Meanwhile, good thermal stability and chemical stability are achieved, it is ensured that no adverse reaction is generated when the coating is in contact with a plastic matrix, the environmental protection requirement is met, and pollution to the environment is avoided.

The invention relates to the technical field of flame-retardant materials, and particularly discloses a full-bio-based reactive flame retardant, a zero-VOC bio-based basic flame-retardant waterborne polyurethane emulsion and a preparation method of the zero-VOC bio-based basic flame-retardant waterborne polyurethane emulsion. According to the invention, vanillin, lysine and phytic acid are taken as raw materials, a full-bio-based reactive flame retardant is synthesized, and the full-bio-based reactive flame retardant can form chemical bonding with a waterborne polyurethane matrix, so that intrinsic flame retardance is realized. A molecular structure of the cosolvent contains a plurality of high-activity groups such as hydroxyl groups, the cosolvent has excellent thermal stability and lasting flame-retardant efficiency, can be chemically bonded with a waterborne polyurethane matrix under a low-temperature condition, remarkably reduces the dosage of the cosolvent, and can realize zero VOC solvent emission when being applied to a chemical flame-retardant modification process of waterborne polyurethane. Meanwhile, the Schiff base group contained in the flame retardant endows the flame retardant with an extra antibacterial function, breeding of microorganisms on the surface and inside of the material can be inhibited after the flame retardant is combined with waterborne polyurethane, material degradation caused by microbial erosion is avoided, the service life of the material is prolonged, and the using effect of the material is improved.

The invention provides high-strength flame-retardant plastic and a preparation method thereof. The high-strength flame-retardant plastic is prepared from the following components: pre-irradiated polyhedral oligomeric silsesquioxane reinforced polypropylene, a flame retardant compound, a flame-retardant synergist, a lubricant and an antioxidant. Wherein the flame retardant compound is prepared by compounding at least two of a hyperbranched triazine charring agent, ammonium polyphosphate, melamine polyphosphate and antimony trioxide. The prepared high-strength flame-retardant plastic has stable char forming property and mechanical property, polypropylene is reinforced by using pre-irradiated polyhedral oligomeric silsesquioxane, so that free radicals are generated on the surface of the polyhedral oligomeric silsesquioxane and can form chemical bonds with a polypropylene chain, the interface bonding force is enhanced, and the mechanical property loss caused by addition of a flame retardant is counteracted. And on the other hand, the problem of poor thermal stability of polypropylene after irradiation can be solved.

The invention relates to a heat-resistant agent for a transparent material and a preparation method of the heat-resistant agent, the heat-resistant agent is prepared from the following raw materials in parts by weight: 30-75 parts of an acrylate monomer, 10-30 parts of an aromatic vinyl monomer, 5-40 parts of a maleimide substance and 0.3-0.5 part of an initiator, and the heat-resistant agent is prepared by a suspension polymerization method. The heat-resistant agent prepared by the invention has excellent heat stability and glass transition temperature, the transparency of the transparent plastic is not influenced after the transparent plastic is added, the preparation process is simple, environment-friendly and low in cost, and the heat-resistant agent can be applied to engineering plastics with requirements on transparency and heat resistance.

The invention relates to the technical field of environment-friendly materials, in particular to a modified regenerated polyphenyl plastic material and a preparation method thereof. The material is composed of a plurality of novel formula components such as regenerated polyphenyl plastic, hydrogenated SBS, PET-PBS, nano titanium dioxide, an antioxidant 1010, calcium stearate and a phosphorus-containing benzoxazine prepolymer. The preparation method comprises the following steps: synthesizing the novel component, pretreating the regenerated polyphenyl plastic, proportioning, mixing, and carrying out extrusion molding to obtain the product. Through a unique formula and a preparation process, the tensile strength, the impact strength, the thermal deformation temperature, the thermal stability, the flame retardance, the antibacterial property, the fluorescence property and the like of the modified regenerated polyphenyl plastic material are remarkably improved.

The invention belongs to the technical field of blown film preparation, and relates to a bio-based poly (butylene furandicarboxylate) blown film and a preparation method thereof, and the blown film is prepared from poly (butylene furandicarboxylate) with specific molecular weight and functional master batch. The preparation method comprises the following steps: step A, preparing polybutylene furandicarboxylate; and step B, preparing the polyfurandicarboxylic acid butanediol blown film. The butanediol furandicarboxylate blown film not only shows excellent thermal stability and mechanical strength, but also has good antibacterial and barrier properties, so that the film is applicable to the fields of food, medicine packaging, agricultural films and the like. The invention aims to provide an environment-friendly high polymer material blown film completely derived from biomass, so as to reduce plastic pollution and provide a sustainable material choice.

The present invention relates to the technical field of fluorine-containing additives, and discloses a fluorine-containing block copolymer and a preparation method thereof. The structural formula of the fluorine-containing block copolymer is: #imgabs0#R F CF3(CF2) m (CH2) n —, m is an odd number from 1 to 7, n is an integer from 1 to 3; R C CH3(CH2) k —, k is an integer of 4 to 12; wherein i:j=0.5 to 2, and the value range of i and j is an integer of 10 to 100. The fluorine-containing block copolymer provided by the present invention has a thermal decomposition temperature of up to 330 to 400°C and exhibits good thermal stability during high-temperature processing; the present invention can be blended with general-purpose plastics (polystyrene, polyethylene, polypropylene, etc.) and the product has good compatibility. While ensuring the mechanical properties, the water-repellent and oil-repellent properties of the blended materials are improved. And compared with the coating process, the present invention exhibits better anti-fouling durability when used in the molding process.

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 discloses octyl vanillate as well as a preparation method and application thereof, and relates to the field of insulating oil additives. According to the invention, vanillic acid and n-caprylic alcohol are subjected to esterification reaction under the action of the bio-enzyme catalyst to synthesize octyl vanillate, and the synthesis method is efficient, green, environment-friendly and low in cost. The prepared octyl vanillate is added into the synthetic ester insulating oil as an antioxidant active component, a long ester chain in the octyl vanillate has high thermal stability, the oxidation of the synthetic ester insulating oil can still be effectively inhibited at high temperature, and the compatibility between the octyl vanillate and the synthetic ester insulating oil is good. Therefore, compared with traditional antioxidants, the synthetic ester insulating oil has remarkable advantages in the aspect of maintaining excellent oxidation resistance and electrical performance of the synthetic ester insulating oil.

The present invention relates to novel esterases, and more particularly to esterase variants having improved activity and / or improved thermal stability compared to the parent esterase of SEQ ID NO: 1 or SEQ ID NO: 2 under acidic conditions and their use for degrading polyester-containing materials, such as plastic articles. The esterase of the present invention is particularly suitable for degrading polyethylene terephthalate and materials containing polyethylene terephthalate under acidic conditions.

The invention provides a waste plastic recovery catalyst system as well as a preparation method and application thereof. The catalyst comprises surface deposition site modified diatomite, a gas-phase atom deposition loaded Pt active component, a Cu and Si regulating agent and a cascade series NaY molecular sieve, wherein the loading capacities of the Pt element, the Cu element and the Si element are respectively 0.02 to 0.1 percent, 0.4 to 3 percent and 0.1 to 0.5 percent. The Pt dehydrogenation active component of the catalyst realizes high dispersion and stability on the specially pretreated diatomite carrier, the agglomeration effect of the active metal at high temperature is weakened, and the thermal stability is improved. The dehydrogenation part and the cracking part of the catalyst are coupled in series, carbon deposition of metal components in the cracking process is slowed down while cascade dehydrogenation activation and catalytic cracking of hydrocarbon molecules are achieved, and the prepared catalyst shows good activity and stability in the waste plastic cracking test process.

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.