36results about How to "Thermally stable" patented technology

The invention discloses a synthesis method of a non-silicon defoaming agent and application of the non-silicon defoaming agent in the field of scandium extraction in hydrometallurgy. The defoaming agent is synthesized by a component A, a component B and a component C through a two-step reaction, the synthesis method comprises the following specific synthesis steps: 1) carrying out esterification reaction on an amino acid substance A and a fatty alcohol substance B to generate an amino ester substance D; and 2) carrying out substitution reaction on the amino ester substance D and a triazine compound C to obtain the non-silicon defoaming agent. The defoaming agent disclosed by the invention is wide in application range, can be applied to links such as a laterite-nickel ore hydrometallurgy front-end scandium extraction method and an MHP hydrometallurgy scandium impurity removal process, is added as an auxiliary agent in the extraction process, and is used for reducing the surface tension of liquid, preventing the formation and enrichment of a third-phase substance and reducing the occurrence of an emulsification phenomenon; the process stability and the output quality are improved, and the method has important industrial application value.

The invention belongs to the technical field of hydrogen bond organic framework materials, and relates to a three-component hydrogen bond organic framework material as well as a preparation method and application thereof, the chemical formula is {C26H21O12P4. (CH6N3). (C10H12N4). (H2O)} n, and n is a positive integer. A structural unit belongs to a triclinic system, a space group is P-1, a molecular formula is C37H41N7O13P4, and each repeating unit comprises a water molecule, a G < + > cation, a DBpy < 2 + > cation and a H5TPE < 3-> molecule; amino groups on G < + > cations, amino groups on DBpy < 2 + > cations, deprotonated HPO3-groups in H5TPE < 3-> molecules and unprotonated phosphonic acid groups have a synergistic effect, and water molecules form a two-dimensional hydrogen bond network. According to the three-component strategy, the chemical and structural diversity of HOFs is greatly expanded, and the material performance is remarkably improved.

The invention relates to the field of thin film materials, and provides a patterned low-internal-stress high-reflection layer and a preparation method and application thereof, and the high-reflection layer comprises an n (Si / Ni) layer, a Cr layer, a cap layer and a patterned reflection layer which are sequentially located on a gamma-Al2O3 substrate from bottom to top; the n (Si / Ni) layer is formed by alternately depositing a Si layer and a Ni layer for n periods, and the alternating period n is 30-60; the average thickness of the Si layer is 15-40 nm, the average thickness of the Ni layer is 3-8 nm, and the ratio of the average thickness of the Si layer to the average thickness of the Ni layer is 5: 1; the lowest layer of the n (Si / Ni) layer is a Si layer and is connected with the gamma-Al2O3 substrate, and the uppermost layer is a Ni layer. The multilayer composite structure design is adopted, high reflectivity, low internal stress, low defect density and chemical stability are achieved, the problems that a traditional high-reflection layer is large in internal stress, large in defect density and the like are solved, and the method can be applied to the fields of photoetching masks, optical imaging and sensors.

The invention relates to a high-entropy oxide wave-absorbing ceramic powder material as well as a preparation method and application thereof, belongs to the technical field of electromagnetic wave absorbing materials, and solves the problems of poor high-temperature resistance and oxidation resistance and low absorption efficiency on low-frequency wave bands of an existing electromagnetic wave absorbing material. The high-entropy oxide ceramic material has a perovskite structure, the molecular structure is ABO3, A comprises La and Sr, and B is at least five elements of Cr, Ni, Mn, Fe, Co, Zr, Hf and Ti. According to the invention, the high-entropy oxide is combined with the perovskite structure, the electromagnetic function of the high-entropy oxide ceramic material is accurately regulated and controlled, and effective absorption of low-frequency electromagnetic waves is realized; the material has oxidation resistance and thermal stability under a high-temperature condition, and excellent electromagnetic function strength of the material at a high temperature is maintained. According to the high-entropy oxide ceramic powder material, the range of an electromagnetic wave absorbing material is widened, the environmental adaptability is improved, and higher requirements of development of a communication technology on the electromagnetic wave absorbing material are met.

The utility model discloses a high-strength polyester FDY (fully drawn yarn) filament which comprises a core yarn and a wrapping yarn wound on the outer side of the core yarn. The core yarn comprises PTFE split film filaments, ultra-high molecular weight polyethylene filaments and hot melting filaments which are doubled and twisted; the wrapping yarn comprises a polyester FDY filament and a special-shaped section polyester filament which are spirally wound on the outer side of the core yarn in opposite directions, the section of the special-shaped section polyester filament comprises a linear fiber body, and first protrusions, second protrusions and third protrusions are symmetrically arranged on the two sides of the fiber body; the first protrusion and the third protrusion incline in the direction away from the second protrusion. The second protrusions are perpendicular to the fiber body. According to the utility model, the PTFE split film filaments are adopted, so that the filaments have thermal stability when being heated. The used ultra-high molecular weight polyethylene filaments provide good strength for the filaments. And the used hot melting filaments can enable the core filaments to be adhered to the wrapping filaments, so that the hair falling phenomenon of the wrapping filaments is reduced. And the polyester filament yarns with the special-shaped cross sections enable the formed fluff to have good upright property.

The application belongs to the technical field of microorganisms, and particularly discloses application of Bifidobacterium longum subsp. longum CGMCC No. 20105 in bacteriostasis. The application discloses for the first time that the Bifidobacterium longum subsp. longum strain CGMCC No. 20105 has the ability to ferment TPY or MRS to synthesize bacteriostatic substances, and the fermentation liquor has certain inhibitory effect on intestinal pathogenic bacteria, oral pathogenic bacteria, environmental pathogenic bacteria and antibiotic-resistant microorganisms. More importantly, the fermentation product does not affect the survival performance of conventional probiotics, indicating that the bacteriostatic substances synthesized by the Bifidobacterium longum subsp. longum strain CGMCC No. 20105 fermentation have certain safety, specificity and pertinence. Compared with other MRS fermentation strains, the bacteriostatic effect of the MRS fermentation liquor of the Bifidobacterium longum subsp. longum strain CGMCC No. 20105 is remarkable, and therefore has potential application value.

The invention discloses lactobacillus bacteriocin as well as a preparation method and application thereof, and belongs to the technical field of microorganisms. According to the invention, a bacteriocin is extracted from lactobacillus pentosus with the preservation number of CCTCC NO: M 2022431, and the bacteriocin has thermal stability, can tolerate low temperature, and can keep the activity in a very wide pH range. Meanwhile, the bacteriocin can inhibit the growth and proliferation of the food-borne pathogenic bacteria Listeria monocytogenes, and the bacteriocin is derived from edible Sichuan pickles, so that the bacteriocin is harmless to human bodies, can provide a new research direction for preventing or treating diseases caused by the food-borne pathogenic bacteria, and has a good application prospect.

The invention provides a dynamic detection method and system for internal temperature distribution of a heated cigarette, and relates to the technical field of cigarette burning and smoking index detection.The method comprises the steps that an actual measurement heating smoking set and a reference heating smoking set which are arranged in a set temperature measurement area in advance are used for heating an actual measurement cigarette and a reference cigarette clamped by the actual measurement heating smoking set and the reference heating smoking set respectively; wherein the actually measured heating smoking set and the reference heating smoking set adopt heating smoking sets of the same model, and the material of the reference cigarette has thermal stability within the heating temperature range of the heating smoking sets; smoking the actually measured cigarette and the reference cigarette by using a smoking machine; performing real-time temperature measurement on the actual measurement heating smoking set, the reference heating smoking set and the exposed ends of the actual measurement cigarette and the reference cigarette by using a non-contact temperature measurement device to obtain temperature data; and according to the temperature data, obtaining an actually measured dynamic cloud picture of the internal temperature of the cigarette. The internal temperature field of the heated cigarette in the heating process can be detected under the condition that the heating smoking set is not broken or intruded.

The invention discloses a mobile phone middle frame with efficient heat dissipation and high-strength impact resistance, which comprises a frame and a middle plate, the middle plate comprises a bottom plate layer, a transition layer and a panel layer which are sequentially laminated from bottom to top, the middle plate is arranged in the frame and is connected with the frame to form an integrated structure, and the surface of the middle plate is also provided with an accommodating cavity; wherein the bottom plate layer and the panel layer are both made of metal materials, the transition layer is formed by compounding a heat conduction material and a metal material, and the heat conduction material is formed by mixing ceramic fibers and metal fibers or carbon fibers. According to the mobile phone middle frame, the bottom plate layer, the transition layer and the panel layer which are sequentially laminated are adopted, the purpose of efficient heat dissipation is achieved, meanwhile, the shock resistance of the middle plate can be enhanced, the strength of the middle plate can be improved, the purpose of reducing the weight of the middle plate can be achieved, and therefore the purposes of efficient heat dissipation, high strength, high hardness and excellent toughening performance are achieved; and the use requirements of mobile phone products can be met.

The present invention relates to an activated carbon for water treatment and a preparation method thereof, and belongs to the technical field of activated carbon. The preparation method comprises the treatment and activation of carbon materials, the grafting of hydrophobic groups, the grafting of long-chain flexible groups, and the cross-linking of silk protein suspension. Beeswax and other materials are used as raw materials, and sodium dodecyl sulfate and polyethylene glycol are used to perform hydrophobic modification and flexible long-chain grafting on the activated carbon. With the help of the structure of silk protein and glutaraldehyde cross-linking to form a stable intertwined network, a higher specific surface area and a more developed pore structure are obtained, the mechanical properties and durability of the activated carbon are improved, and its adsorption efficiency and stability in water treatment are further improved.

The invention provides a double-layer pressure-bearing pipe and a preparation method thereof, and belongs to the technical field of pipes, and the preparation method comprises the following steps: carrying out infiltration surface treatment on continuous glass fiber bundles and pretreated basalt fibers in a composite coupling agent ethanol solution, carrying out vacuum drying, uniformly mixing with molten high-density polyethylene, and pressing into a glass fiber / basalt fiber composite belt; the preparation method comprises the following steps: mixing and stirring molten-state high-density polyethylene and modified hollow glass microspheres to prepare an HGM / HDPE composite material, extruding to prepare an inner-layer pipe blank, winding a glass fiber / basalt fiber composite belt on the inner-layer pipe blank, and compounding at 380-400 DEG C to prepare a composite inner-layer pipe; preheated epoxy resin and other auxiliaries are mixed and stirred, the amination-modified SiO2 / CeO2 composite filler is added, high-speed stirring and uniform mixing are performed, the mixture is sprayed to the outer surface of the composite inner layer pipe to form an outer protection layer, high-temperature curing is performed, and the double-layer pressure-bearing pipe is prepared. The bearing strength can be improved, and meanwhile durability and corrosion resistance are achieved.

The invention discloses a polypropylene composite material with weather resistance and flame retardancy and a preparation method thereof, and belongs to the field of thermoplastic high molecular polymer materials. The invention comprises the following steps: a benzyl-containing hindered phenol antioxidant, bromine and a free radical initiator react to obtain a brominated hindered phenol antioxidant; the brominated hindered phenol antioxidant reacts with an amino-terminated organosiloxane to obtain a hindered phenol-organosiloxane; hindered phenol-organosiloxane, a carbon-carbon double bond-terminated organosiloxane and an organic weak acid react to obtain a carbon-carbon double bond-terminated hindered phenol-organosiloxane; hindered phenol-organosiloxane and propylene are polymerized under the action of a composite catalyst to obtain a polypropylene composite material. The invention directly introduces a functional group with flame retardancy and antioxidant properties into the main chain of polypropylene by covalent crosslinking during the preparation process of polypropylene, and then polymerizes to obtain a polypropylene composite material with weather resistance and flame retardancy.

The invention relates to a system and method for testing the high-temperature creep performance of a thermoplastic non-crosslinked insulating material, and relates to the technical field of cable material performance test.The system comprises a temperature control box, a sample bearing frame and a pressure loading mechanism; the temperature control box body is provided with a test chamber which can be closed, a temperature control module is arranged on the temperature control box body, and the temperature control module is used for controlling the temperature of the test chamber and realizing air circulation in the test chamber; the sample bearing frame is fixedly arranged in the test chamber and is used for horizontally bearing at least one sample to be tested; the pressure loading mechanism comprises a pressure applying unit and a weight assembly, the pressure applying unit is arranged on the upper side of the sample bearing frame, and the weight assembly is connected with the pressure applying unit, so that the pressure applying unit applies constant vertical acting force to the surface of the to-be-tested sample. Through a high-precision temperature control and forced circulation system integrated by the temperature control box body and the temperature control module, the temperature fluctuation and gradient in the box are effectively reduced, a more stable thermal environment is provided, and a test temperature field is more uniform.

The invention provides a preparation method of polyurethane sponge with integral fireproof and flame-retardant properties and good environmental protection property, and the preparation method comprises the following steps: mixing polyether polyol, isocyanate, environment-friendly fireproof microcapsules, a catalyst, a cross-linking agent, a foam stabilizer and a cooling type foaming agent, and carrying out foaming reaction to obtain polyurethane fireproof sponge, wherein the cooling type foaming agent is selected from at least one of perfluorohexanone, perfluorohexane, tetrafluorodibromoethane and heptafluoropropane; a capsule core material of the environment-friendly fireproof microcapsule is selected from at least one of carbon dioxide, heptafluoropropane, hexafluoropropane, perfluorohexanone, perfluorohexane, tetrafluorodibromoethane and trifluorotrichloroethane.

This invention discloses a hot melt adhesive for high-temperature protective clothing and its preparation method, comprising the following raw materials: Fischer-Tropsch wax, styrene-isoprene-styrene block copolymer with 0% diblock content, styrene-isoprene-styrene block copolymer with 20-30% diblock content, styrene-isoprene-styrene block copolymer with 40-50% diblock content, rosin resin, petroleum resin, ethylene-vinyl acetate copolymer, and antioxidant. This hot melt adhesive requires no toxic solvents, possesses both heat resistance and water resistance, and is suitable for high-temperature protective clothing. The preparation method of this hot melt adhesive involves heating and mixing polymer materials without adding any solvents or toxic substances during the preparation process, reducing the risk of toluene poisoning, completely solving the problems of solvent evaporation and recovery, and, more importantly, eliminating safety hazards in the storage and use of organic chemicals, achieving environmentally friendly, safe, and efficient production.

The present invention relates to the field of thin film materials, and provides a patterned low internal stress high reflective layer and a preparation method and application thereof, wherein the high reflective layer comprises γ-Al 2 O 3 n(Si / Ni) layer, Cr layer, cap layer, and patterned reflective layer on the substrate; the n(Si / Ni) layer is composed of n cycles of Si layer and Ni layer alternately deposited, and the alternating cycle n is 30-60; the average thickness of the Si layer is 15-40nm, the average thickness of the Ni layer is 3-8nm, and the average thickness ratio of the Si layer to the Ni layer is 5:1; the bottom layer of the n(Si / Ni) layer is a Si layer and is adjacent to the γ-Al 2 O 3 The substrate is connected, and the top layer is a Ni layer. The present invention adopts a multi-layer composite structure design to achieve high reflectivity, low internal stress, low defect density and chemical stability, solving the problems of high internal stress and high defect density in traditional high reflective layers, and can be applied to photolithography masks, optical imaging and sensor fields.

The invention provides a method for obtaining a garlic fermentation extract with high content of S-allyl-L-cysteine, and belongs to the technical field of biology. The bacillus subtilis capable of producing invertase is separated from a natto product, and the bacillus subtilis can be applied to food and is high in passage stability; the obtained invertase has transglutaminyl ability and thermal stability, the enzyme activity is not reduced due to the influence of conditions in the biosynthesis process, and gamma-glutamyl-S-allyl-L-cysteine (SAC) can be efficiently biotransformed to obtain S-allyl-L-cysteine (SAC) when the invertase is applied to preparation of the garlic extract. Compared with endogenous enzyme self-transformation, the method has the advantages that the time required for obtaining high-content SAC is remarkably shortened, and the SAC content in the garlic fermentation extract can reach 0.8%, is 200 times of the SAC content in fresh garlic, and is far higher than the market product level.

The utility model relates to the technical field of building construction, in particular to a prefabricated U-shaped building block structure which comprises frameworks, each framework comprises two rib plates and a bottom plate, concrete mortar is fixedly connected between every two frameworks, a trapezoidal concave groove and a trapezoidal convex groove are formed in the two sides of each rib plate, and the bottom plate is fixedly connected with the bottom plate. And each trapezoidal groove and the corresponding trapezoidal convex groove are linearly arranged in a staggered mode, the interior of each trapezoidal groove is matched with the outer surface of the corresponding trapezoidal convex groove, and the outer surfaces of part of the trapezoidal convex grooves are clamped into the corresponding trapezoidal grooves. The device is provided with the framework, in the framework which is formed by linearly arranging and vertically piling a plurality of frameworks, the corrugated groove II at the top of the rib plate is embedded into the corrugated groove I of the bottom plate, and meanwhile, wood chips or thickened concrete mortar can be added between the corrugated groove I and the corrugated groove II; and therefore, the effect of leveling and heightening the wall body piled up by the framework is facilitated.

The invention discloses a nano ceramic coating insulator for an electric dust remover and a preparation method of the nano ceramic coating insulator, and belongs to the technical field of flue gas pollutant treatment. According to the method, the nano ceramic coating is prepared, then the insulator body made of a ceramic material is subjected to degreasing, oil removal and acid pickling pretreatment, the surface of the insulator is coated with the nano ceramic coating, firm combination of the nano ceramic coating and the body is achieved through self-assembly (SAMs), and a nano ceramic coating structure is constructed; according to the nano ceramic coating insulator, the good hydrophobicity and the anti-sticking function of the ceramic coating structure and the firm combination of chemical bonds between the nano ceramic coating structure and the insulator body are utilized, so that water vapor on the surface of the insulator cannot form a sheet of water film, creepage and high-voltage breakdown are avoided, meanwhile, dust cannot be bonded to form pollution flashover, and the service life of the insulator is prolonged. Therefore, the anti-condensation and anti-pollution flashover effects of the insulator are achieved, and the operation of an electric heater and hot air blowing in the operation process is reduced or even canceled.

The invention belongs to the technical field of microorganisms, and particularly discloses application of bifidobacterium longum CGMCC (China General Microbiological Culture Collection Center) No.20105 in an antibacterial aspect. The invention discloses the bifidobacterium longum subsp. Longum strain CGMCC No.20105 for the first time, and the bifidobacterium longum subsp. Longum strain has the capability of fermenting TPY or MRS to synthesize antibacterial substances, and the fermentation liquor of the bifidobacterium longum subsp. Longum strain has a certain inhibition effect on enteropathogenic bacteria, oral pathogenic bacteria, environmental pathogenic bacteria and antibiotic-tolerant microorganisms. More importantly, the fermentation product does not influence the survival performance of conventional probiotics, which shows that the antibacterial substance synthesized by fermentation of the bifidobacterium longum subsp. Longum strain CGMCC No.20105 has certain safety, specificity and pertinence. Compared with other MRS fermentation strains, the bifidobacterium longum subsp. Longum strain CGMCC No.20105 MRS fermentation liquor has a remarkable antibacterial effect, so that the bifidobacterium longum subsp. Longum strain has a potential application value.

The present invention provides a method of producing short amylose, treating a native starch containing amylopectin with a 4-a-glucanotransferase to extend the starch chain, and treating the extended starch chain with a starch debranching enzyme to produce an a-amylase resistant starch comprising short amylose fragments; the method is a method for producing the low-molecular-weight alpha-amylase resistant starch under the condition of high temperature, the obtained alpha-amylase resistant starch has the polymerization degree of 12-25, the conversion efficiency from natural starch to the alpha-amylase resistant starch is not lower than 50% by weight, the whole reaction process is carried out under the condition of 80-85 DEG C, and the alpha-amylase resistant starch can be produced under the condition of high temperature. The resistant starch capable of resisting hydrolysis of alpha-amylase can be obtained and is used for reducing the calorie content of the starch or increasing the content of dietary fibers of the starch; meanwhile, the low-molecular-weight alpha-amylase resistant starch has thermal stability at least in a solution of about 80 DEG C, so that the low-molecular-weight alpha-amylase resistant starch can be widely applied to food processed under high temperature or high humidity.

The utility model discloses a bone patch composite stent. A G-BCP (at) PLA bone patch composite stent is prepared through a combined method of 3D printing and freeze drying. The composite scaffold is composed of a 3D printed PLA (or PCL) double-layer hexagonal support frame and a porous G-BCP bioactive filler, and is loaded with an active factor BMP, magnesium ions or icariin. The composite scaffold has the mechanical strength (20-40 MPa) and flexibility equivalent to those of cancellous bones, highly interconnected pores (the porosity is 40-70%), good osteoconductivity, osteoinductivity and vascularization promotion and appropriate degradation rate. The bone patch stent is free of cytotoxicity and can be converted into a clinical product so as to meet personalized, accurate and efficient bone reconstruction requirements of patients with large-area bone defects.

This invention relates to an npn-type solar-blind ultraviolet detector using Ga2O3 as the light-absorbing layer and its fabrication method. The detector, from bottom to top, comprises a GaN substrate, a CuI hole transport layer, a Ga2O3 solar-blind ultraviolet absorption layer, a Ti electrode layer, and an Au electrode layer. An In electrode layer is disposed on one side of the CuI hole transport layer on the GaN substrate. This invention uses n-GaN, which has high electron mobility, good thermal stability, and a mature fabrication process, as the bottom substrate; p-CuI, with high hole concentration, high mobility, and excellent p-type conductivity, and good energy level matching with n-GaN and subsequent materials, as the hole transport layer; and n-Ga2O3, with an ultrawide bandgap, high chemical stability, and a high absorption coefficient for solar-blind ultraviolet light, as the light-absorbing layer. Combining the low contact resistance of the bottom In electrode with the high contact area of ​​the top Ti / Au interdigitated electrode improves carrier collection efficiency.

The invention provides a nitrile hydratase mutant and application thereof. The nitrile hydratase mutant is obtained by mutation of amino acid residues on a flexible ring structural domain of the wild type nitrile hydratase and comprises any one or a combination of mutations 1-3: mutation 1: polar amino acid mutation on a flexible ring between secondary structural domains S1 and S2 of a beta subunit of the wild type nitrile hydratase, and mutation 2: polar amino acid mutation on a flexible ring between the secondary structural domains S1 and S2 of the beta subunit of the wild type nitrile hydratase, and mutation 3: polar amino acid mutation on a flexible ring between the secondary structural domains S1 and S2 of the beta subunit of the wild type nitrile hydratase; the 152-site amino acid site of the beta subunit is mutated; mutation 2: polar amino acid mutation on a flexible ring between secondary structural domains H6 and H7 located at the starting end of the beta subunit of the wild nitrile hydratase, and mutation of the 110-site amino acid site of the beta subunit; mutation 3: a hydrophobic amino acid located on an initial flexible ring L1 of a beta subunit of the wild nitrile hydratase is mutated, and a 17-site amino acid site of the beta subunit is mutated. The nitrile hydratase mutant provided by the invention singly or plays a synergistic regulation effect, has certain enzyme activity, and has good thermal stability and tolerance.

The present invention provides a carbon dioxide absorbing composition containing an ionic species containing a cyclic ammonium cation and a method for separating carbon dioxide using the carbon dioxide absorbing composition, the carbon dioxide absorbing composition of the present invention having high thermal stability and chemical stability and having an excellent carbon dioxide absorbing effect. In addition, the method for separating carbon dioxide using the carbon dioxide absorbing composition is very effective for desorption of carbon dioxide, and the carbon dioxide absorbing composition can be reused, thus being a very economical method.

The invention provides a process for printing on the surface of gel and application of the process, and belongs to the technical field of printing. The printing material is prepared from the following components in parts by weight: 80 to 100 parts of composite sodium alginate, 30 to 50 parts of composite fatty alcohol-polyoxyethylene ether, 20 to 30 parts of color fixing agent, 15 to 20 parts of humectant, 0.1 to 15 parts of dye, 10 to 20 parts of filler, 3 to 5 parts of dispersing agent, 3 to 5 parts of surfactant, 30 to 50 parts of cross-linking agent and 0.5 to 3 parts of photoinitiator. When the prepared printing material is applied to a printing process, chemical treatment does not need to be carried out on a matrix material, the surface of a matrix such as gel is not damaged, and the printing material has good adhesiveness and excellent environment resistance.

The present invention provides a carbon dioxide absorbing composition containing an ionic substance containing a spiroammonium cation and a method for separating carbon dioxide using the carbon dioxide absorbing composition, the carbon dioxide absorbing composition of the present invention having high thermal stability and chemical stability and having an excellent carbon dioxide absorbing effect. In addition, the method for separating carbon dioxide using the carbon dioxide absorbing composition is very effective for desorption of carbon dioxide, and the carbon dioxide absorbing composition can be reused, thus being a very economical method.

The utility model discloses a flame-retardant and heat-insulating DTY (draw textured yarn) polyester composite yarn which comprises a core yarn, a first covering fiber layer and a wrapping yarn layer, the core yarn comprises PTFE (Polytetrafluoroethylene) split film filaments and polyphenylene sulfide fiber yarns which are doubled and twisted; the first coating fiber layer is made of aerogel flame-retardant PP (polypropylene) fibers; the wrapping yarn layer comprises flame-retardant DTY polyester filaments. According to the flame-retardant and heat-insulation DTY polyester composite yarn, the PTFE split film filaments and the polyphenylene sulfide fibers adopted in the core yarn have the flame-retardant effect and the heat stability, and therefore the polyester composite yarn can have the good size stability. The aerogel flame-retardant PP fiber enables the composite filament to have a heat insulation effect and a flame-retardant effect.

The application provides an antibacterial peptide AMP-OUC329 of marine plant Lactobacillus and application thereof, the antibacterial peptide is derived from marine plant Lactobacillus Bac-329, the amino acid sequence is VSGFETLDEDAKKLSNN, the molecular weight is 1866.5 Da, and the antibacterial peptide has thermal stability and acid stability.The application extracts the metabolite of Bac-329 strain by culture, obtains the crude extract of antibacterial peptide, uses the antibacterial activity of water product spoilage bacteria Shewanella and the damage of bacterial microstructure as directional screening index, separates by Sephadex G-25 gel filtration chromatography and TSKgel G2000SWxl reverse phase high performance liquid chromatography, optimizes the separation and purification conditions of antibacterial peptide, and the obtained antibacterial peptide has strong inhibition activity on Shewanella and precise target.

The application discloses a kind of ZIF-8 nanoparticle loaded cellulose barrier membrane and preparation method thereof, comprising the following steps: (1) TOCNF suspension gel is diluted into TOCNF suspension by deionized water, to obtain nanocellulose suspension solution A;(2) zinc nitrate hexahydrate is added in solution A to obtain solution B;(3) polyvinylpyrrolidone is added in solution B to obtain solution C;(4) 2-methylimidazole is added in solution C to obtain solution D;(5) solution D is placed in mold by vacuum filtration device to form a wet film, the wet film is removed, and the wet film is clamped between two pieces of acrylic plate, dried in vacuum drying oven, to obtain ZIF-8 nanoparticle loaded cellulose barrier membrane.The application selects TOCNF as the template for ZIF-8 growth, TOCNF as the template for ZIF-8 in-situ growth, which can effectively prevent them from forming aggregates, and load ZIF-8 nanoparticles through in-situ + non-in-situ method to improve the hydrophobicity, thermal stability and ultraviolet shielding property of TOCNF membrane.