670 results about "Polyglutamic acid" patented technology

The invention provides a special charcoal-based slow-release fertilizer for sandy soil as well as a preparation method and application thereof, and belongs to the technical field of fertilizers. The special charcoal-based slow-release fertilizer for the sandy soil is prepared from amino modified biomass charcoal, urea, urea formaldehyde, monoammonium phosphate, potassium sulfate, polyglutamic acid, fulvic acid, clay, attapulgite, a compound microbial agent and sodium alginate. The compound microbial agent is prepared from halomonas (ACCC 11681), bacillus subtilis (ACCC 60429) and bacillus mucilaginosus (ACCC 10094), and the compound microbial agent is prepared from bacillus subtilis (ACCC 60429) and bacillus mucilaginosus (ACCC 10094). The invention further provides a preparation method and application of the special charcoal-based slow-release fertilizer for the sandy soil. The special charcoal-based slow-release fertilizer for the sandy soil can remarkably improve the water and fertilizer retention capacity of the sandy soil, improve the farmland productivity of the sandy soil, save fertilizer and water input and improve the yield and quality of crops.

The invention discloses a preparation method of an intelligent response type soil conditioner based on a nano composite material, and belongs to the technical field of soil improvement. The modifier is prepared from 10 to 15 parts of modified chitosan, 15 to 25 parts of nano silicon dioxide, 20 to 30 parts of biochar-loaded polyglutamic acid, 8 to 15 parts of humic acid-sodium alginate microcapsules, 3 to 5 parts of trace element slow-release particles, 1 to 2 parts of a pH response type cross-linking agent and 15 to 25 parts of a functional agent. The soil conditioner researched and developed by the invention can flexibly adapt to complex and changeable soil environments, can sensitively sense dynamic changes of key environmental indexes such as soil humidity, pH value and temperature, automatically and accurately regulates and controls the release rate and the action effect of the soil conditioner, realizes multiple functions such as water retention, acid regulation, fertility increase and pollution resistance in a one-stop manner, and has a wide application prospect. High efficiency, long-term effect and ecological environment friendliness of soil improvement are comprehensively achieved, a new road is opened up for global soil improvement, and agricultural yield increase, ecological restoration and urban green development are assisted.

The invention relates to a preparation method of antibacterial gamma-polyglutamic acid superabsorbent hydrogel. The preparation method comprises the following steps: (1) preparing a gamma-polyglutamic acid solution; (2) dissolving an antibacterial agent in the gamma-polyglutamic acid solution, and fully stirring and uniformly mixing to obtain a mixed solution 1; adjusting the pH value of the mixed solution 1, heating the mixed solution 1 to 60 DEG C, and continuously reacting for 1-2 hours to obtain a mixed solution 2; cooling the mixed solution 2 to room temperature, adding a cross-linking agent, and uniformly mixing to obtain a mixed solution 3; standing the mixed solution 3 at room temperature for 1-3 hours and then carrying out gradient heating reaction to obtain an antibacterial gelatinous product; and (3) dehydrating the antibacterial gelatinous product, and carrying out vacuum negative pressure drying to obtain a dried hydrogel product, namely the antibacterial gamma-polyglutamic acid super absorbent hydrogel. The antibacterial gamma-polyglutamic acid superabsorbent hydrogel prepared by the invention has good biocompatibility, is safe and non-toxic, also has excellent water absorption performance and antibacterial performance, and has a good application prospect.

The invention belongs to the technical field of soil improvement, and relates to a soil conditioner for saline-alkali soil and a soil improvement method. The soil conditioner comprises vinegar residues, chitin, glucose, a composite biological preparation, a modified gel and a functional additive, the composite biological agent comprises bacillus subtilis powder, bacillus licheniformis powder, trichoderma spore powder, brown algae powder and light calcium carbonate; the functional auxiliary agent comprises modified bentonite, polyglutamic acid, pregelatinized starch and biochar potassium humate. Through the synergistic effect of multiple components and structural design optimization, systematic remediation of physical properties, chemical properties and biological activity of the saline-alkali soil is achieved. According to the technology, the limitation of single function of a traditional improvement measure is broken through, and the long-standing technical problems of return salt rebound, low fertility, microbial community imbalance and the like in saline-alkali soil treatment are effectively solved by constructing a multi-layer and multi-dimensional soil improvement system.

The invention relates to the technical field of fertilizers, in particular to an environment-friendly water-soluble fertilizer containing a seaweed extract and polyglutamic acid. The water-soluble fertilizer is prepared by preparing seaweed oligosaccharide and double-grafted poly-L-gamma-sodium glutamate and compounding and complexing the seaweed oligosaccharide and the double-grafted poly-L-gamma-sodium glutamate, has the characteristics of low salting-out, high stability, no precipitation, good slow release performance and the like, and can continuously release nutrients and keep a solution clear and transparent under a low-salt condition; and because the polyglutamic acid and seaweed extract compound drip irrigation agent has the chelation and water retention characteristics of the polyglutamic acid and the natural growth promoting effect of the seaweed extract, the crop rhizosphere nutrient absorption efficiency and stress resistance are remarkably improved, the compound drip irrigation agent is suitable for drip irrigation and water and fertilizer integrated application of greenhouse vegetables, fruit trees and field crops, and the comprehensive effects of high efficiency, low salt load and environment friendliness are achieved.

The invention discloses a preparation method of a biodegradable material based on gamma-polyglutamic acid, which comprises the following steps: (1) preparing a low-molecular-weight polyglutamic acid aqueous solution, adjusting the pH value to be acidic to obtain a carboxylic acid group protonated polyglutamic acid solution, then adding a metal ion solution into the polyglutamic acid solution, and uniformly stirring and mixing to obtain a mixed solution; and (2) adjusting the pH value of the mixed solution obtained in the step (1) to be alkaline while stirring, then adding a cross-linking agent into the mixed solution, and carrying out cross-linking curing to obtain the biodegradable material. The material disclosed by the invention has mechanical properties, tensile strength, toughness and the like can be improved, so that the material can better meet the requirements of different application scenes, the application range of the material is widened, and meanwhile, the material has relatively good degradation performance, adsorption performance, antibacterial performance and moisture retention performance, can be produced by utilizing renewable resources, is wide in raw material source and sustainable, and is suitable for industrial production. The dependence on non-renewable resources such as petroleum is reduced.

The invention relates to the technical field of textile material and fiber processing, in particular to a high-elasticity moisture-absorption breathable acetate fabric and a preparation method thereof. The invention discloses a high-elasticity moisture-absorption breathable acetate fabric and a preparation method thereof.The acetate fabric takes a bio-based degradable thermoplastic polyester elastomer as an island and acetate as a sea, a homothermal double-hole structure is embedded in the acetate fabric, and the surface of the acetate fabric is covered with a polyglutamic acid and chitosan oligosaccharide self-repairing hydrophilic layer; the preparation method comprises the following steps: pre-burying alkali-resistant microspheres in a marine facies through solid island-solution sea double-path spinning of a bio-based degradable thermoplastic polyester elastomer and acetate, synchronously forming groove-closed pore double channels through simultaneous heating one-step alkali etching-baking, and finally forming a dynamic reversible hydrogen bond network through polyglutamic acid and chitosan oligosaccharide, so as to obtain the marine-based degradable alkali-resistant hydrogel. A bio-based finishing layer with a self-repairing function is obtained, and the finally obtained fabric has the characteristics of high elasticity, breathability, lasting moisture absorption, greenness and degradability.

The invention relates to a natural antioxidant for prefabricated vegetables and a preparation method of the natural antioxidant, and belongs to the technical field of food additives. The antioxidant is prepared from rosmarinic acid, carnosic acid, drug-loaded cellulose and double-phase chelating microspheres; the drug-loaded cellulose is prepared by modifying cellulose with quercetin, loading anthocyanin and then wrapping with a trehalose-gamma-polyglutamic acid composite film; the biphase chelating microspheres are phytic acid-citric acid biphase sustained-release microspheres formed by wrapping phytic acid and citric acid with a chitosan and sodium alginate composite film. Through multi-component functional complementation, multi-stage slow release design and physical-chemical synergistic barrier, comprehensive inhibition of the oxidation problem of the prefabricated vegetable is realized, a'free radical scavenging-metal chelating-phase interface stabilization 'triple protection system is constructed, accurate oxidation resistance in different stages of processing, storage and transportation is realized, and the prepared vegetable has good market prospects. The bottlenecks of short action period and single protection dimension of a natural antioxidant are broken through.

The invention relates to the field of compound fertilizer analysis, and discloses an analysis method and device for combining polyglutamic acid and a compound fertilizer, computing equipment and a storage medium, and the method comprises the following steps: determining a growth cycle and a critical period of crops of which a fertilization scheme needs to be analyzed; determining environment conditions and nutrient absorption characteristics of crop growth; determining types of fertilizer raw materials and fertilization modes according to environmental conditions and nutrient absorption characteristics; combined fertilization schemes corresponding to different growth cycles are generated according to fertilizer raw material types and fertilization modes; inputting the plurality of combined fertilization schemes into a first fertilizer effect prediction model to obtain evaluation results of the plurality of combined fertilization schemes; and determining an optimal combined fertilization scheme according to the evaluation results of the plurality of combined fertilization schemes. According to the application, a polyglutamic acid and compound fertilizer combination scheme is designed according to crop requirements, and then a scheme with an optimal crop growth effect is selected according to the evaluation model, so that crops can obtain required nutrients, and the production cost is reduced.

The invention discloses a saline-alkali soil improvement and disease resistance double-effect controlled release fertilizer and a preparation method thereof. The fertilizer comprises 18-22% of biochar, 12-18% of furfural residues, 8-12% of cow dung compost and 6-10% of potassium humate. 5-7% of aluminum sulfate, 4-6% of sulfur and 3-5% of zeolite; the microbial inoculum comprises the following components in percentage by weight: 1.5 to 2.5 percent of saline-alkaline bacillus, 0.8 to 1.2 percent of bacillus subtilis and 0.8 to 1.2 percent 8-12% of a sodium polyacrylate coating, 4-6% of a sulfur coating and 1-3% of polyglutamic acid; 0.8 to 1.2 percent of humic acid chelated iron, 0.8 to 1.2 percent of algal polysaccharide and 0.8 to 1.2 percent of urease inhibitor; 0.8 to 1.2 percent of zinc sulfate, 0.5 to 1.0 percent of manganese sulfate and 0.5 to 1.0 percent of borax. The fertilizer can reduce the pH and conductivity of soil, increase the organic matter content of the soil and effectively improve the physicochemical properties of the soil, meanwhile, by adding the microbial agent, the disease resistance of crops can be effectively improved, the morbidity and disease index of the crops can be reduced, and nutrient release of the fertilizer has a sustained and controlled release characteristic; the initial release rate and the cumulative release rate of nitrogen are both lower than those of common chemical fertilizers, and the cumulative release rate of nitrogen is moderate within 60 days, so that the nutrient requirements of crops in different growth stages can be met.

The invention discloses bacillus subtilis subsp. Natto YJ01 and application of the bacillus subtilis subsp. Natto YJ01. The preservation number of the bacillus subtilis subsp. Natto YJ01 strain is GDMCC No: 64944, and the bacillus subtilis subsp. Natto YJ01 strain can be used for dissolving inorganic phosphorus and synthesizing various active substances such as indoleacetic acid, siderophore, protease, gamma-polyglutamic acid, exopolysaccharide and the like. The YJ01 can promote the germination of lavender seeds and the growth in the germination period, and promote the growth and development of corn and oil sunflower plants. Meanwhile, the YJ01 can tolerate a high saline-alkali environment and can improve the physical structure of saline-alkali soil, and key growth indexes such as biomass, leaf area and root development of the corn and the oil sunflower can be effectively improved by applying the YJ01 to the saline-alkali soil. Therefore, the application of the strain YJ01 not only provides a new method for crop growth promotion and saline-alkali soil improvement, but also has important significance for agricultural sustainable development.

The invention relates to a method for detecting activity of gamma-polyglutamic acid hydrolase and application. The method comprises the following steps: (1) preparing an enzymolysis reaction solution and a blank reaction solution; (2) preparing an NAC / OPA mixed solution; (3) adding an NAC / OPA mixed solution into the enzymatic hydrolysis reaction solution to obtain a reaction solution to be detected; (4) drawing a standard curve by taking L-glutamic acid as a standard substance; and (5) detecting the fluorescence intensity of the blank reaction solution and the reaction solution to be detected by using a microplate reader, and then calculating the activity of the gamma-polyglutamic acid hydrolase according to the fluorescence intensity and the standard curve. The method for detecting the activity of the gamma-polyglutamic acid hydrolase is high in detection speed, detection of a single sample can be completed within 25 min, and nearly real-time process monitoring is achieved. And the method has the advantages of reliable detection result and high accuracy, can be used for monitoring the enzyme activity of the gamma-polyglutamic acid hydrolase in the gamma-polyglutamic acid preparation process in real time and guiding the optimization of the fermentation process, and has extremely high industrial application value.

The invention relates to the field of microorganisms, and discloses a complex microbial inoculant for preventing and treating clubroot of rape. Comprising the following raw materials in parts by weight: 10 to 12 parts of acid-resistant bacillus, 12 to 15 parts of pseudomonas fluorescens PF-5, 8 to 10 parts of bacillus mucilaginosus, 5 to 7 parts of halophilic bacillus, 8 to 10 parts of bacillus amyloliquefaciens, 12 to 15 parts of trichoderma atroviride ReTv2, 6 to 8 parts of azotobacter chroococcum, 10 to 12 parts of chitosan-gamma-polyglutamic acid microspheres, 12 to 15 parts of diatomite and 8 to 12 parts of humic acid. And 2-4 parts of algal polysaccharides. The living space of plasmodiophora brassicae is preempted by the acid-resistant bacillus; the pseudomonas fluorescens PF-5 directly strikes pathogenic bacteria and stimulates the defense system of the oilseed rape; the bacillus amyloliquefaciens releases a plurality of antibacterial substances; the trichoderma atroviride ReTv2 rapidly destroys the structure of the plasmodiophora brassicae in a manner of hyperparasitism and exoenzyme secretion.

The invention relates to the technical field of agriculture, provides a red soil hardening reduction conditioner based on modified straw adsorption carbon as well as a preparation method and application thereof, and solves the problems that an existing red soil hardening conditioner is poor in soil improvement effect and does not have a slow release function. Comprising the following steps: (1) preparing oyster shell-biochar composite powder; (2) loading functional components; (3) directional immobilization of microorganisms; (4) coating a slow-release layer; (5) activating treatment; the red soil hardening reduction conditioner is prepared from the following raw materials in parts by weight: 80 to 100 parts of oyster shell powder, 100 to 200 parts of modified straw adsorption carbon, 10 to 30 parts of rice hull powder, 30 to 50 parts of nano dihydrate gypsum, 100 to 200 parts of a polyglutamic acid solution, 10 to 50 parts of acid-resistant bacillus, 15 to 30 parts of sodium alginate, 30 to 60 parts of humic acid, 10 to 30 parts of carbide slag and 30 to 60 parts of attapulgite.

The invention relates to a composite microbial agent suitable for saline-alkali soil remediation of sorghum production in northeast alpine regions, and a preparation method and application thereof. The composite microbial agent comprises bacillus subtilis, bacillus mucilaginosus and pseudomonas fluorescens. Bacillus mucilaginosus capable of efficiently producing polyglutamic acid and potassium and pseudomonas fluorescens capable of secreting chitinase are separated and screened from obstacle soil in northeast alpine regions, and field trials are carried out in the obstacle soil (coastal saline-alkali soil) in the northeast alpine regions. The low-temperature slow-release fertilizer has the unique characteristics of secreting polyglutamic acid, potassium and chitinase under the low-temperature condition, is low in cost, and can effectively improve the physical and chemical properties of soil, increase the seed emergence rate, stimulate the root growth and enhance the salt resistance and alkali resistance of seedlings after being applied.

The invention relates to the technical field of soil remediation and fertilizer preparation, and discloses a soil remediation fertilizer and a preparation method thereof.The soil remediation fertilizer is formed by compounding a pre-fermented organic matrix and a function activation component, and the organic matrix comprises chicken manure, corn straw, fermented sesame cake powder and traditional Chinese medicine residue powder; a stable organic fertilizer matrix is obtained through high-temperature composting fermentation; the function activation component comprises freeze-dried saccharomyces cerevisiae embedded by chitosan-baking soda, a pineapple peel crude extract, polyglutamic acid, yeast cell walls, fulvic acid, trace mineral substances, microporous vermiculite and the like. After the fertilizer is applied into soil, the embedded flora and the slow-release carbon source are activated through soil moisture and an acid-base environment, the rhizosphere in-situ re-fermentation process is triggered, and the synergistic remediation function of continuous nutrient release, micro-ecological regulation and soil structure improvement is achieved. The product provided by the invention has the advantages of composite structure, synergistic function, controllable activation condition, good ecological adaptability and popularization value.

The invention discloses an anti-seepage, water-locking and fertilizer-retaining sandy land soil conditioner, and relates to the technical field of sandy land soil improvement, the anti-seepage, water-locking and fertilizer-retaining sandy land soil conditioner comprises the following raw materials by mass: 50-60% of decomposed cow dung; 15 to 20% of modified straw fiber; 12 to 15% of a sodium carboxymethyl cellulose solution with a concentration of 0.1%; 3 to 5% of bentonite; 1-2% of a microbial agent; 0-15% of a slow-release compound fertilizer; 0.5-1% of polyglutamic acid; and 0.5-1% of a stone-chitosan coating agent. The invention also discloses a preparation method of the anti-seepage, water-locking and fertilizer-retaining sand soil conditioner. The preparation method comprises the following steps: step 1, straw modification; step 2, cow dung decomposition; step 3, preparing a colloidal solution; step 4, mixing and granulating; step 5, coating treatment; and step 6, post-processing. By adopting agricultural wastes as main raw materials, resource utilization of the wastes is realized, and a biodegradable material is introduced to replace synthetic resin, so that the degradation period is shortened to 18-24 months.

The invention relates to the technical field of agricultural fertilizers, in particular to an organic-inorganic composite silicon-calcium-magnesium fertilizer and a preparation method and application of the organic-inorganic composite silicon-calcium-magnesium fertilizer. The high-temperature activated silicon-calcium-magnesium mineral powder is composed of calcined wollastonite powder, calcined serpentine powder, dolomite powder and zeolite powder; 2%-5% of an organosilane modifier, wherein the organosilane modifier is composed of gamma-aminopropyl triethoxy silane and gamma-glycidyl ether oxypropyl trimethoxy silane, and the organic silane modifier is composed of gamma-aminopropyl triethoxy silane and gamma-glycidyl ether oxypropyl trimethoxy silane; 18%-35% of a functional organic matter complex, wherein the functional organic matter complex is composed of mineral source sodium humate, bioactive small peptide, sodium alginate and polyglutamic acid; and 3%-8% of auxiliary functional components, so that the solubility and the bioavailability of silicon, calcium and magnesium elements in minerals are remarkably improved.

The invention provides an organic-inorganic composite conditioner for improving a soil structure. Comprising the following raw materials in parts by mass: 100-150 parts of calcium, 20-50 parts of magnesium, 10-20 parts of polyglutamic acid, 0.5-2 parts of zinc, 2-4 parts of boron, 2-4 parts of iron, 100-150 parts of organic nitrogen, 150-200 parts of composite organic natural polypeptide amino acid, 50-70 parts of seaweed boron molybdenum, 50-80 parts of phosphorus calcium zinc liquid, 20-50 parts of seaweed calcium magnesium boron iron zinc and 100-120 parts of a plant nutrition preparation. The fertilizer is prepared from the following raw materials in parts by weight: 10-15 parts of high phosphorus and high potassium, 150-200 parts of organic waste compost, 50-80 parts of a synergist and 50-100 parts of a functional microbial agent. Through a unique chelation technology, polyglutamic acid and calcium and magnesium ions are fully fused to form an efficient medium trace element water-soluble fertilizer, calcium and magnesium are directly absorbed by a root system after flushing application, the calcium utilization rate is improved by 50% or above, and due to the fact that polyglutamic acid carries strong negative charges, fertilizer loss caused by rainwater leaching is effectively reduced, and the yield of the fertilizer is improved. And the water-retaining and fertilizer-retaining functions are more obvious when the fertilizer is used in sandy loam.

The invention discloses an oral instant film suitable for pet nutrition intervention and a preparation method of the oral instant film, and belongs to the technical field of pet oral preparations. The instant film adopts a sandwich type multi-layer structural design, sequentially comprises a first food calling layer, a core layer and a second food calling layer, can be selectively provided with a functional layer and an interface middle layer, and constructs a staggered hot-pressing laminated structure, so that the structural stability and the function delivery efficiency of a film body are remarkably improved. The core layer contains multiple composite active ingredients such as L-carnitine, coenzyme Q10, beta-glucan, glucosamine sulfate and the like, chitosan-inulin-polyglutamic acid or starch is adopted for embedding to form a first microcapsule and a second microcapsule, and intelligent delivery of temperature / pH response and gastrointestinal controlled release is achieved. The food calling layer is composed of chicken powder, fish oil powder, fructo-oligosaccharide and the like, and the feeding compliance of pets is improved.

The invention relates to a cellulose-chitosan-based lithium ion battery diaphragm and a preparation method and application thereof.The preparation method of the diaphragm comprises the steps that gamma-polyglutamic acid and polyamide epichlorohydrin are adopted for modifying chitosan, the hydrophilicity and the liquid absorption capacity of the chitosan are improved, polyvinylpyrrolidone is adopted for coating the chitosan, and the hydrophilicity and the liquid absorption capacity of the chitosan are improved; pVP is replaced in ethanol soaking to form micropores, so that the porosity of the modified chitosan is improved. Amino groups and hydroxyl groups of the modified chitosan are combined with catechol of the polydopamine and hydroxyl groups of the hydroxy propyl cellulose through hydrogen bonds and covalent bonds to form a chitosan-cellulose-PDA interpenetrating network, and the diaphragm material suitable for the lithium ion battery is finally prepared by combining hot-pressing shaping. The preparation method has the advantages that the balance between the mechanical property and the ion conduction property of the diaphragm is realized through multi-component compounding by utilizing the biocompatibility and renewability of natural macromolecules (cellulose and chitosan).

The invention belongs to the technical field of membrane separation, and particularly relates to a low-pressure high-flux polyamide / polysulfone hollow fiber composite nanofiltration membrane and a preparation method thereof. The preparation method of the composite nanofiltration membrane comprises the following steps: dissolving sulfonated polysulfone, poly (1-vinyl-3-butylimidazole) bromide and polyvinylpyrrolidone to prepare a spinning solution, and spinning to obtain a base membrane; carrying out hydrophilic modification on the base membrane by using 1, 3-propane sultone; then, an aqueous phase solution containing poly (gamma-glutamic acid) and triethylene tetramine and an organic phase solution containing trimesoyl chloride and 3, 5-diaminobenzoic acid are subjected to interfacial polymerization in the inner cavity of the modified base membrane to form a polyamide separation layer; and finally, carrying out heat treatment to obtain the composite nanofiltration membrane. Through the synergistic effect of zwitterionic ionization of the base membrane and biomacromolecule construction of the separation layer, the mass transfer resistance of water is remarkably reduced, unification of high flux and high selectivity is achieved, and good structural stability is achieved.

The invention belongs to the technical field of biological bacterial fertilizers, and discloses a Chinese herbal medicine carrier-based multifunctional microbial bacterial fertilizer, which comprises a microbial strain group, a Chinese herbal medicine active component group, an organic matter and nutrition carrier, mineral elements and auxiliary components, and a functional synergist. Through the synergistic interaction of Chinese herbal medicine active ingredients and functional microbial flora, breeding of harmful bacteria in soil is inhibited, synthesis of acetylcholin esterase of nematodes is interfered, a continuous cropping disease occurrence chain is blocked from the source, and meanwhile, organic acid and flavonoid substances slowly released by a Chinese herbal medicine carrier are utilized to activate resistance gene expression of a plant system, so that the disease resistance of the nematodes is improved. The tolerance threshold of crops to high temperature, cold damage and diseases is enhanced; in the composite carrier, humic acid and diatomite are crosslinked through hydrogen bonds to form a stable granular structure, the cation exchange capacity and porosity of soil are effectively improved, the strong hydration capacity of polyglutamic acid is combined to lock nutrients and moisture, and development of meristem of a root system and proliferation of capillary roots are promoted.

The invention belongs to the technical field of chemical fertilizer preparation, and discloses an efficient water-soluble fertilizer based on polyglutamic acid and a preparation method thereof.The efficient water-soluble fertilizer comprises the following raw materials: polyglutamic acid which is prepared through a microbial fermentation method, has the molecular weight range of 500-1500 kDa and the purity of more than or equal to 95% and serves as a core water and fertilizer retention and nutrient slow release carrier; the high-quality fulvic acid is derived from weathered coal or biochemical extraction, the content of the fulvic acid is greater than or equal to 50%, and the fulvic acid is used for promoting root development and nutrient absorption; the humic acid takes young lignite as a raw material, the content of the humic acid is greater than or equal to 70%, and the humic acid is used for improving the granular structure and microbial activity of soil; the calcium element is added in the form of soluble calcium salt such as calcium nitrate and calcium amino acid chelate, the calcium content is larger than or equal to 10%, and the calcium element is used for enhancing the stability and stress resistance of cell walls of crops in terms of CaO; and the acid-base equilibrium stress-resistant factor comprises a silicon nanowire. The invention provides an efficient water-soluble fertilizer based on polyglutamic acid and a preparation method of the efficient water-soluble fertilizer. The water-soluble fertilizer has higher fertilizer utilization rate, better crop growth promoting effect and stronger stress resistance.

The invention relates to a mussel bionic adhesive material based on oligopeptide modified polyglutamic acid, and a preparation method and application thereof, and belongs to the field of bionic bio-based materials. The preparation method comprises the following steps: firstly, synthesizing tyrosine-containing oligopeptide through protease catalysis, and modifying the oligopeptide onto a polyglutamic acid skeleton to obtain a bionic polymer precursor; meanwhile, polyglutamic acid is modified by cysteine groups, so that a bionic high polymer material with reducibility is synthesized, and a required reducibility reaction environment is provided. The preparation method comprises the following steps: uniformly mixing the polyglutamic acid and the precursor, activating tyrosine in the precursor in a reducing environment by using tyrosinase, converting the tyrosine into dopa to finally obtain a bionic adhesive material solution, and adjusting the pH value of the solution to be close to an isoelectric point of the polyglutamic acid to realize self-assembly to form the adhesive. The adhesive prepared by the preparation method disclosed by the invention shows excellent adhesion performance and also shows good biocompatibility.

The invention discloses a water-retention synergistic coated slow-release fertilizer and a preparation method thereof, and relates to the technical field of water-retention slow-release fertilizers. The coated slow-release fertilizer sequentially comprises a fertilizer core, an inhibitor layer, a slow-release coating layer, a bonding layer and a water-retaining slow-release layer from inside to outside. Wherein the inhibitor layer is composed of a urease / nitrification inhibitor, the slow-release coating layer is composed of organic polymer resin, the bonding layer is composed of an ethyl cellulose binder, and the water-retaining slow-release layer is composed of a modified water-retaining agent. The coated slow-release fertilizer prepared by the invention has good water retention performance, controlled release performance and salt resistance, is suitable for high-salt soil, and can obviously improve the nitrogen fertilizer utilization rate. Meanwhile, the combination of polyglutamic acid and sulfonic acid groups is used for modifying polyacrylic acid to prepare the modified water-retaining agent, so that a synergistic effect on improving the salt resistance of the coated slow-release fertilizer is achieved, the fertilizer efficiency can be improved, the loss is reduced, the soil environment is improved, and the water-retaining capacity of soil and the utilization rate of the fertilizer are improved.

The invention belongs to the technical field of sealants, and particularly relates to a heat-conducting flame-retardant sealant for a power battery and a preparation method thereof.The heat-conducting flame-retardant sealant for the power battery is prepared through collaborative design of a composite heat-conducting filler and a polyglutamic acid-melamine cyanurate-calcium hydrophosphate composite flame retardant and combination of magnetic field dispersion, ultrasonic blending and silane coupling agent interface optimization technologies; the heat-conducting and flame-retardant properties of the material are obviously improved. A lithium silicate glass ceramic precursor is subjected to surface modification through phosphorus oxychloride, the combination of a reinforcing filler and a matrix is enhanced, a flexible cross-linked network is constructed by amino-terminated polyether and an isocyanate curing agent, and the mechanical strength and thermal stability are guaranteed. The sealant inhibits combustion propagation and reduces toxic gas release through a multi-stage reaction mechanism during thermal runaway, meanwhile, the sealant adapts to high-frequency vibration and thermal cycle working conditions of a battery module, and the preparation process realizes synergistic enhancement of heat conduction and flame retardance through gradient stirring, vacuum defoaming and filler uniform dispersion technologies.

The invention relates to the technical field of fertilizers, in particular to a seaweed-containing synergistic monoammonium phosphate fertilizer as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a seaweed extract with beta-cyclodextrin, performing microencapsulation, and performing spray drying to obtain an embedded material; mixing with monoammonium phosphate and polyglutamic acid, and granulating; spraying salt-resistant compound bacteria liquid on the surfaces of the particles; and finally, coating the particles with a chitosan-sodium alginate composite film. According to the prepared synergistic monoammonium phosphate fertilizer finished product, the phosphorus utilization rate of monoammonium phosphate saline-alkali soil can be increased, the phosphorus fixation rate can be greatly reduced, the retention rate of active ingredients of the seaweed extract is greatly increased compared with that in the prior art, the rhizosphere survival rate of salt-tolerant flora is greatly increased, and the salt-tolerant flora, the seaweed extract and monoammonium phosphate cooperate to promote crop yield increase.

The invention relates to the technical field of compound fertilizers, and discloses a silicon-containing compound fertilizer special for lodging resistance and disease prevention of rice and a preparation method thereof.The silicon-containing compound fertilizer is prepared from 30-35 parts of organic compound matrix, 20-26 parts of straw liquefied matter, 5-10 parts of water-soluble silicon fertilizer, 4-8 parts of humic acid, 1-1.5 parts of microbial agent, 0.5-0.8 part of polyglutamic acid, 5-10 parts of compound coating liquid and 0.2-0.5 part of microelement chelate, the composted duck manure, the peat and the coco coir are used as main raw materials, the air permeability of the peat is combined with nutrients of the duck manure, soil hardening can be improved, soil fertility can be improved, the water-soluble silicon fertilizer is matched with the organic compound matrix, absorption of silicon elements by rice is promoted, a silicified cell layer is formed on the stem epidermis, then the cell wall thickness is increased, and the rice yield is increased. The breaking strength of the stalks is improved.

The invention discloses a gamma-polyglutamic acid and hydrophilic polysiloxane composite material and application thereof, and belongs to the technical field of medical antibacterial coating materials. The gamma-polyglutamic acid and hydrophilic polysiloxane composite material is prepared from a hydrophilic polysiloxane aqueous solution and a gamma-polyglutamic acid aqueous solution through an ionic cross-linking reaction, the hydrophilic polysiloxane is prepared by sequentially carrying out click chemical reaction and ionization modification on polysiloxane with a side chain containing vinyl and a sulfydryl-containing compound; the sulfydryl-containing compound also contains a carboxylic acid group or an amino-terminated group; when the sulfydryl-containing compound further contains carboxylic acid groups, the raw materials of the ionic cross-linking reaction further comprise an aqueous solution containing divalent metal cations. The composite material has low swelling rate and good antibacterial performance, and can be used for long-acting stable antibacterial. As an antibacterial coating, the composite material is suitable for the surfaces of medical apparatuses and instruments made of different materials, and has a wide application prospect.