582 results about "Natural polymers" patented technology

The invention provides an injectable short-fiber-based hydrogel tissue repair material with an electric response characteristic as well as a preparation method and application thereof, and the injectable short-fiber-based hydrogel tissue repair material with the electric response characteristic is prepared by taking a natural polymer material loaded with bioactive factors as a core layer material and a biodegradable material as a shell layer material through a coaxial electrostatic spinning technology. The method comprises the following steps: preparing short fibers with a core-shell structure, uniformly mixing the short fibers with a hydrogel matrix, injecting and filling a tissue defect part, and carrying out ultraviolet curing to form the tissue repair material. The injectable short-fiber-based hydrogel tissue repair material with the electrical response characteristic provided by the invention has piezoelectric characteristic and injectable characteristic, can generate electrical response through mechanical stimulation so as to promote cell proliferation and tissue repair, and also has controllable drug release capacity and good mechanical adaptability; the method is suitable for application scenes of complex tissue damage repair such as diabetes infected wound repair, articular cartilage repair, oral barrier membrane repair, abdominal wall defect repair and the like.

The invention relates to a poly-(2-oxazoline) epoxy derivative and application thereof, and belongs to the technical field of crosslinking. The invention provides a poly-(2-oxazoline) epoxy derivative, which is completely different from existing cross-linking agents such as 1, 4-butanediol diglycidyl ether (BDDE), divinyl sulfone, glycidyl methacrylate and the like in structure, and has the advantages that the structure is simple; the polymer can be used as a cross-linking agent for cross-linking natural high-molecular polymers such as polysaccharide (such as hyaluronic acid) and protein and synthetic high-molecular polymers such as polyethylene glycol and polyvinyl alcohol. Compared with an existing cross-linking agent, the poly-(2-oxazoline) epoxy derivative has the advantages that the poly-(2-oxazoline) epoxy derivative can be easily subjected to a cross-linking reaction with high-molecular polymers such as hyaluronic acid, the prepared cross-linked substances such as sodium hyaluronate gel are more stable and uniform, the performance of the prepared cross-linked substances is easier to regulate and control and the like, and the poly-(2-oxazoline) epoxy derivative has a great application prospect.

The invention relates to the technical field of water treatment, and particularly provides a polyaluminum chloride composite water treatment agent and a preparation method thereof, and the polyaluminum chloride composite water treatment agent comprises the following components in percentage by weight: 80-90% of polyaluminum chloride; 0.5%-2% of modified chitosan; 3%-8% of sodium lignosulphonate-Fe < 3 + > complex; 0.1%-0.5% of a pH regulator; wherein the modified chitosan is citric acid cross-linked chitosan, the deacetylation degree of the modified chitosan is not lower than 85%, and in the sodium lignosulphonate-Fe < 3 + > complex, the molar ratio of Fe < 3 + > to sodium lignosulphonate is 1: 3. Through the synergistic interaction of polyaluminum chloride and a natural polymer composite system, the design of an efficient, green and multifunctional water treatment agent is realized.

The present invention relates to a natural light crosslinked hydrogel comprising MXene and a method for preparing same. The present invention provides a natural polymeric hydrogel formed through natural light crosslinking in a non-harmful visible light spectrum. As the hydrogel comprises a drug and MXene, the hydrogel exhibits excellent biocompatibility with no cytotoxicity. It has been confirmed that the hydrogel can maximize a wound healing effect by modulating photothermal reactions and controlling drug release. Accordingly, the hydrogel may be effectively used for wound treatment as a pharmaceutical composition, a quasi-drug composition, and a cosmetic composition.

A preparation method for a bionic multi-channel nerve conduit, and a bionic multi-channel nerve conduit. A double-layer shape memory nanofiber membrane is used as a receiving substrate, strip-shaped and spaced gel strips are printed on an oriented side, seed cells are planted on the strip-spaced nanofiber membrane, temperature changes are adjusted to cause the fiber membrane at the bottom layer to have a deforming response and curl up, gel strips wrapped by the self-curling fiber membrane self-shape into a conduit, gaps between the gel strips form a multi-channel structure inside the conduit, an inner wall of the multi-channel nerve conduit becomes oriented natural polymer nanofibers which can provide directional guidance for nerve regeneration, and the multi-channel tube structure promotes the formation of a vascular network in the conduit and provides more space for nerve cell growth. The present invention can be applied to long-distance peripheral thick nerve defects, and has good application prospects.

The invention discloses a high-valued graded utilization method of marine shells, and belongs to the technical field of comprehensive utilization of biological resources and preparation of functional materials. The method comprises the following steps: cleaning, air-drying and superfine grinding marine shell wastes such as abalone shells, and extracting water-soluble organic components in the marine shell wastes by adopting mild water extraction, so that the obtained extract is rich in protein, polysaccharide or small molecule peptide, has good biological activity, and can be used for preparing functional materials such as biomimetic mineralization, tissue repair and the like; extracted shell powder residues are subjected to heat treatment or chemical activation treatment and then compounded with natural polymer materials such as chitosan and sodium alginate, and the composite adsorbent which is loose in structure and large in specific surface area is prepared and can be used for removing dye, heavy metal, antibiotics and other water pollutants. According to the invention, separate utilization of organic components and inorganic framework materials in the marine shells is realized, and the method has the characteristics of environmental protection, efficient resource conversion and multifunctional application, and has a good industrial popularization prospect.

The invention relates to the technical field of coating liquid, and particularly discloses anti-reflection self-cleaning type coating liquid as well as a preparation method and application thereof. The invention provides anti-reflection self-cleaning type coating liquid. The anti-reflection self-cleaning type coating liquid is specifically prepared from, by weight, 12-18 parts of polymethyl methacrylate, 5-8 parts of composite sol, 3-6 parts of silane, 2-4 parts of inorganic materials, 1-3 parts of an anti-reflection agent and 30-40 parts of a solvent. The composite sol is obtained by carrying out water bath heat preservation reaction treatment on a natural polymer colloid and a styrene-acrylonitrile-glycidyl methacrylate copolymer through a dopamine hydrochloride aqueous solution; the inorganic material is formed by mixing silicon dioxide with the particle size of 10-30 nm and silicon dioxide with the particle size of 40-70 nm according to the weight ratio of (0.5-1.5): (5-8). The anti-reflection self-cleaning coating liquid prepared by the invention can obviously improve the light transmittance and self-cleaning property of photovoltaic glass; and the durability and the stability of the coating layer are excellent.

The present invention relates to the field of metal corrosion and protection, and specifically to a preparation method and application of a modified chitosan Schiff base corrosion inhibitor. The preparation method comprises six steps: (1) preparing a gel-like chitosan dispersion; (2) preparing an ethanol solution of 2,6-dimethyl-5-heptenal; (3) adding the gel-like chitosan dispersion; (4) adding the ethanol solution of 2,6-dimethyl-5-heptenal and conducting a Schiff base reaction; (5) rotary evaporation and dehydration of the reaction product; and (6) washing, filtering, and drying. The present invention utilizes 2,6-dimethyl-5-heptenal, a common food additive, as a modifier to condense with natural polymer chitosan to prepare an acid corrosion-resistant corrosion inhibitor, with a simple process and low production cost. The invention is applied to N80 steel sheets in a hydrochloric acid medium for corrosion protection, uses a low concentration, and effectively improves the corrosion inhibition rate of the corrosion inhibitor on metals. The invention is a green, environmentally friendly, economical, and efficient corrosion inhibitor with good promotion prospects.

The invention relates to the technical field of natural polymer material processing, and discloses a cross-linked composite chitosan solution which is composed of the following components in percentage by mass: 1%-5% of chitosan, 0.1%-5% of a cross-linking agent, 0.1%-5% of acetic acid and the balance of water, and the cross-linked composite chitosan solution is prepared from the following components in percentage by mass: 1%-5% of chitosan, 0.1%-5% of a cross-linking agent, 1%-5% of acetic acid and the balance of water. The cross-linking agent is one or more of glutaraldehyde, citric acid and epoxy chloropropane. According to the cross-linked composite chitosan solution and the preparation method of the chitosan fiber of the cross-linked composite chitosan solution, the adaptability of the cross-linked composite chitosan solution in a human body can be further improved and the immunoreaction can be reduced through a cross-linking reaction, so that the enhancement of the biocompatibility of the cross-linked composite chitosan solution can be ensured; by selecting different cross-linking agents and controlling the cross-linking degree, the biodegradation rate of the chitosan can be adjusted to a certain extent, so that the chitosan is more suitable for specific medical or environmental application requirements, and in addition, the water resistance of the chitosan can be remarkably improved through the cross-linking effect.

The invention provides an intelligent antibacterial konjac glucomannan composite film and a preparation method thereof. The intelligent antibacterial konjac glucomannan composite film is prepared by carrying out graft copolymerization on oxidized konjac glucomannan OKGM and amino-functionalized poly (N-isopropylacrylamide) PNIPAM-NH2 and then crosslinking with an antibacterial agent, the tail end of a molecular chain of the amino-functionalized poly (N-isopropylacrylamide) is provided with an amino group. The intelligent antibacterial konjac glucomannan composite film disclosed by the invention has temperature responsiveness, can control the release of an antibacterial agent according to environmental changes, ensures that the antibacterial agent is accurately released as required, and effectively prolongs the food preservation time and the food shelf life. The film is good in biocompatibility, has no obvious toxic reaction on human tissues and cells, and provides possibility for application in the field of biomedicine. Besides, the film has degradability, and the OKGM and the chitosan are natural high polymer materials and can be decomposed into harmless substances by microorganisms in the natural environment, so that the film meets the requirements of environmental protection and is beneficial to reducing environmental pollution.

The invention discloses a degradable polymeric flocculant and application thereof.The preparation method specifically comprises the following steps that sulfonated starch is dissolved in deionized water, chitosan composite powder is added, the mixture is heated and stirred until the chitosan composite powder is dissolved, acrylamide is added after ultrasonic dispersion, then N, N '-methylene bisacrylamide and potassium persulfate are added, the mixture is stirred until a gel state is formed, and the degradable polymeric flocculant is obtained; cutting the gel into small blocks, soaking the small blocks in distilled water for washing, and drying, crushing and sieving the washed gel to obtain the degradable polymeric flocculant. According to the preparation method, the flocculation capacity and the degradation capacity are improved by compounding synthesized organic polymer and natural polymer materials, the antibacterial capacity and the degradation performance are improved by compounding silver oxide, titanium oxide and graphene oxide, and the composite material is good in flocculation and sedimentation capacity, excellent in degradation performance and good in antibacterial capacity.

The invention relates to the technical field of polymer composite materials, and discloses a refining treatment method of a bamboo fiber ultra-nano micro powder and natural polymer blended material, which comprises the following steps: (a) premixing bamboo fiber ultra-nano micro powder and a deep eutectic solvent to obtain a premix and realize in-situ activation; (b) adding the premix and a natural polymer matrix from a main feed port of a double-screw extruder; and (c) in the melt blending process, adding a dynamic interface locking agent through a side feeding port arranged at the downstream of the main feeding port, and then extruding and granulating. A staged dynamic compatibilization process is adopted, a hydrogen bond network of bamboo fibers is destroyed by using a deep eutectic solvent to promote shearing dispersion of the bamboo fibers in the front section, and stable interface bonding is constructed in the rear section through a dynamic interface locking agent after dispersion is completed. The method synergistically solves the conflict between dispersion and interfacial compatibilization, so that the composite material has good comprehensive performance.

The invention relates to the technical field of ecological restoration, in particular to an ecological restoration composite material and a preparation method thereof. Comprising a base material: 30-70 parts of a natural polymer material or a degradable synthetic polymer material; reinforced fibers: 5-40 parts of natural fibers or degradable synthetic fibers; a functional additive: 10-40 parts of at least one of a water-retaining agent, an organic fertilizer, a microbial carrier and a soil conditioner; a plant growth promoter: 1-15 parts of humic acid, a seaweed extract, a trace element fertilizer or an antagonistic antibacterial agent; a binder: 0 to 15 parts of a degradable polymer binder; and 5-15 parts by weight of water. According to the invention, the biodegradability of the material is ensured, the mechanical strength is improved and the overall performance of the composite material is enhanced by optimizing the combination of base materials, pretreating the reinforced fibers, achieving the synergistic effect of the multifunctional additive and efficiently loading the plant growth promoter; the ecological restoration composite material provides long-term support for plant growth.

The invention relates to a method for treating sewage by using an efficient grafting type natural polymeric flocculant, and belongs to the technical field of environmental protection. Not only is the flocculation performance of the material improved, but also the dissolving performance of natural macromolecules is improved; the high polymer material is wide in source and low in price, and the flocculant material has relatively high cost performance; the natural polymer has biodegradability and is non-toxic, so that secondary pollution to the water body is avoided; compared with a polyacrylamide flocculant, the mass proportion of the added acrylamide in the final flocculant is greatly reduced, and the pollution risk of an acrylamide monomer is greatly reduced; the method has the characteristic of high efficiency, and the putting amount is low and is generally 0.1-0.5 mg / L; the composite material is suitable for treating water bodies with different charges, has good salt resistance and a wide pH range, can be applied within 2-11, and can be used for treating kaolin turbid liquid, a humic acid aqueous solution and a hematite powder turbid liquid, and the pollutant removal rate of the treated water sample is higher than 98.5%.

The invention discloses a degradable organic-inorganic composite film and a preparation method and application thereof, and belongs to the technical field of composites.The method comprises the steps that 1, an organic amine stabilizer, a calcium source, a phosphorus source and an organic solvent are used for preparing a calcium phosphate nano-cluster precursor, and calcium phosphate nano-clusters are obtained through further separation; (2) mixing the calcium phosphate nano-cluster and a natural polymer material to prepare a uniformly dispersed emulsion, the natural polymer material including carboxymethyl chitosan and alginate, using the emulsion to prepare a membrane, and during the membrane preparation process, generating an evaporation-induced self-assembly process to prepare the membrane. The degradable organic-inorganic composite film is obtained by combining a rod-like hydroxyapatite nanocrystal which is formed by phase change of the calcium phosphate nanocluster and crystallization with a natural high polymer material. The organic-inorganic composite film has adjustable mechanical properties, can be naturally and directly degraded in soil, and has wide application prospects in the fields of packaging, agriculture, medical treatment and the like.

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 discloses a preparation method of modified carboxymethyl cellulose lithium for a lithium ion battery, and belongs to the technical field of chemical modification of natural polymer materials, decarboxylation and acidification are performed simultaneously, hydrolysis and lithiation are performed simultaneously, and preparation and purification are simple; a branched structure is grafted on lithium carboxymethyl cellulose, additional carboxyl and hydroxyl are introduced after grafting and hydrolysis, the lithium content of the obtained modified lithium carboxymethyl cellulose is higher than that of common lithium carboxymethyl cellulose, and the grafted branched polymer contains a multi-hydrogen-bond structure, so that the adhesive property is enhanced.

Disclosed in the present invention are a gel having a regulatable free water content and morphology, a preparation method therefor, and the use thereof. The method comprises: S1, preparing a solution A from a natural polymer material; S2, mixing a small molecule material containing a positively charged polar group with the solution A to obtain a composite solution B; S3, mixing the composite solution B with a regulator to obtain a composite solution C, stirring same, then adding a condensing agent to the reaction system, and carrying out a curing crosslinking reaction; and S4, removing the regulator and the condensing agent to obtain the gel. By adjusting the concentrations of the natural polymer material and the regulator, gels having different morphologies can be prepared; the gel undergoes a physical process to remove hydrogen bond interaction between the gel and free water, so that the content of free water attached to the surface of the gel can be regulated, thereby regulating the physical and chemical properties of the gel. The gel of the present invention has regulatable morphology and controllable elastic modulus, and has many advantages such as good lubrication effect, good biocompatibility and biodegradability, capability of being biologically active, and capabilities of stimulating cell growth and accelerating wound repair.

The invention discloses a long-acting analgesic compound as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a mixed solution containing a polymer, a local anesthetic, a non-steroidal anti-inflammatory drug and a solvent into drug-loaded microspheres through an electrostatic spraying technology; the preparation method comprises the following steps: dissolving poloxamer and a natural polymer material in water to obtain a hydrogel solution; and uniformly mixing the drug-loaded microspheres and a hydrogel solution to prepare the long-acting analgesic compound. The long-acting analgesic compound comprises drug-loaded microspheres and hydrogel, the long-acting analgesic compound and the hydrogel are both of a three-dimensional porous network structure, the drug-loaded microspheres are evenly dispersed in the hydrogel, and the drug-loaded microspheres are of a solid spherical structure. The advantages of electrostatic spraying microspheres and hydrogel are combined, the preparation method is mild in condition and simple in process, and the preparation process is non-toxic and harmless; the long-acting analgesic compound has the advantages of thermosensitivity, injectability, high drug loading rate and the like, and can be effectively applied to preparation of analgesic products.

The invention discloses high-strength gelatin / carbonic acid dihydrazide modified sodium alginate natural polymer hydrogel for 3D printing and a preparation method and application of the high-strength gelatin / carbonic acid dihydrazide modified sodium alginate natural polymer hydrogel. A gelatin solution and a carbonic acid dihydrazide modified sodium alginate solution are blended to obtain gelatin / carbonic acid dihydrazide modified sodium alginate ink; then, the hydrogel subjected to ink 3D printing is sequentially soaked in a CaCl2 solution and soaked in an EDC / NHS solution for cross-linking to be subjected to sequential enhancement treatment, and the high-strength natural polymer hydrogel is obtained. In addition, bioactive factors can be introduced into the 3D printing high-strength natural polymer hydrogel system, so that a bioactive hydrogel stent meeting clinical requirements is prepared. The biological ink A loaded with the growth factor for promoting corneal epithelialization and the biological ink B loaded with the histone deacetylase inhibitor are printed layer by layer through a multi-nozzle 3D printing system, so that the bioactive double-layer hydrogel scaffold can be obtained and used for corneal regeneration. The operation involved in the preparation process of the 3D printing high-strength natural polymer hydrogel is simple and convenient, and the system has high designability and universality.

The invention belongs to the technical field of chemical modification of natural polymer materials, and particularly relates to a modified cellulose adhesive and a preparation method thereof. The modified cellulose adhesive is prepared from the following components in parts by weight: 50 to 70 parts of modified cellulose-based emulsion, 10 to 20 parts of VAE (Vinyl Acetate Ethylene) composite emulsion, 5 to 8 parts of rosin water emulsion, 3 to 8 parts of cross-linking agent and 2 to 5 parts of plasticizer, the modified cellulose is obtained by grafting an epoxy hypophosphite compound and a fluorine-containing pentaphenyl alkynyl dicarboxylic acid compound with a nano cellulose solution; according to the prepared modified cellulose adhesive, targeted improvement of waterproofness, durability and bonding strength is achieved through molecular design.

The invention discloses a polyampholyte chitosan with high polymerization degree and water solubility and a preparation method thereof, and belongs to the field of natural polymer material preparation. The polyampholyte chitosan is prepared by mixing aminosulfonic acid and one or more of glycerol, urea, lactic acid or choline chloride as a low eutectic solvent, and then adding chitosan for modification, and contains a polyampholyte of cationic groups and anionic groups. The chitosan sulfate product prepared by the invention has a small molecular weight loss, controllable modification sites, and can obtain a polyampholyte chitosan with high polymerization degree; the sulfation reaction has high efficiency, few side reactions, high product purity, good product water solubility, and extremely high application value.

This research indicates a new kind of bio-self-assembled nanocomposite hydrogel based on natural xanthan polymer and sodium montmorillonite nanoparticle in the field of polymers, which is modified by Triaminopropyl triethoxysilane. This process does not contain any chemical cross-linking agent and it also has been synthesized; this bio-self-assembled nanocomposite hydrogel aims to function as a removal of heavy metals from drinking water and wastewater because it has the property to absorb ions. The self-assembling hybrid nanocomposite hydrogel is composed of xanthan gum which is a natural polymer and sodium montmorillonite which is an unmodified clay nanoparticle with precursor triaminopropylene triethoxysilane and hydrolysis of the precursor to stabilize nanoparticles to increase the surface area absorbent matrix, abundant binding and absorption sites, improvement of swelling behavior; the increase of the absorption capacity of heavy metals in the absence of any crosslinking agent was designed and synthesized.

The invention belongs to the technical field of marine anti-drag materials, and particularly relates to a porous anti-drag coating and a preparation method thereof.The method comprises the steps that a substrate is coated with a mixed solution of natural polymers, cellulose nanocrystals, a two-dimensional nanomaterial and water and then soaked in a metal salt solution for a certain time, and a cross-linked coating is formed; the preparation method comprises the following steps: taking out the porous cross-linked coating, treating the porous cross-linked coating by using a directional freezing casting technology, soaking the porous cross-linked coating in an organic-inorganic mixed solution for a certain time, removing inorganic salt in the porous cross-linked coating after taking out the porous cross-linked coating, and performing hot pressing on the porous cross-linked coating to obtain the porous anti-drag coating. The organic-inorganic mixed solution is obtained by mixing a silane coupling agent, an inorganic precursor, inorganic salt, an adhesive polymer and an organic solvent. The finally obtained porous anti-drag coating has the characteristics of hardness and softness, rough surface, good mechanical stability, obvious micro vortex and excellent anti-drag performance.

The invention discloses a multifunctional coating with a compact-porous double-layer structure on the surface of magnesium alloy and a preparation method, and belongs to the technical field of biological materials. According to the multifunctional coating, magnesium alloy serves as a substrate, a compact layer and a porous layer are sequentially stacked from the substrate to the outside, and the compact layer is composed of two-dimensional transition metal carbide / nitride, calcium silicate nanowires and a positively charged polymer. The porous layer is composed of copper-containing complex / biopolymer composite fibers, mineralized silk fibers loaded with bioactive metal ions and astragalus polysaccharide on the surface, and natural polymers. According to the multifunctional coating with the compact-porous double-layer structure prepared on the surface of the magnesium alloy, the porous layer on the surface layer has a unique porous structure, growth and proliferation of osteoblasts can be well promoted, meanwhile, the multifunctional coating has the characteristics of pressure resistance, bacteria resistance and oxidation resistance, the compact layer on the bottom layer can improve the corrosion resistance of the magnesium alloy, and the service life of the magnesium alloy is prolonged. The coating is particularly suitable for surface coating of magnesium alloy implant materials and can be used in the field of medical instruments.

The invention provides a method for preparing vaterite type nanoscale calcium carbonate with ardealite as a raw material and application of the method, and relates to the technical field of inorganic nano-material preparation.The method comprises the following steps that firstly, efficient dissociation of calcium ions in the ardealite is achieved through a phase transfer method, then digestion treatment is conducted on a leaching solution, and the leaching solution is obtained; a crystal morphology regulating agent is further introduced to construct a mineralized microenvironment, and then through a carbon dioxide carbonization reaction, vaterite type nano-scale calcium carbonate with a specific average particle size (200-400 nm) is prepared. According to the preparation method, natural high polymer materials such as collagen are introduced in the preparation process to serve as green crystal form guiding agents, so that the coordination effect of the natural high polymer materials and calcium ions can be utilized, the crystal morphology can be effectively regulated and controlled, and the biocompatibility of the nano material is improved; and the application possibility of calcium carbonate in the biomedical fields of drug carriers, bone repair materials and the like is expanded.

The invention discloses a sodium alginate / chitosan microsphere for loading cells and a preparation method, the preparation method comprises the following steps: adding a pore-foaming agent into a sodium alginate solution, and stirring overnight to obtain a sodium alginate solution containing the pore-foaming agent; the preparation method comprises the following steps: dissolving chitosan in an acetic acid solution, adding calcium chloride, and stirring until the calcium chloride is completely dissolved to obtain a chitosan mixed solution; dropwise adding a sodium alginate solution containing a pore-foaming agent into the chitosan mixed solution, standing, and filtering to obtain a microsphere precipitate; soaking the microsphere precipitate in a hydrochloric acid solution until no bubble overflows, filtering, cleaning and drying; according to the sodium alginate / chitosan microspheres for loading the cells, natural polymer materials, namely the sodium alginate and the chitosan, are adopted, so that excellent biocompatibility is ensured, and the rejection reaction risk is reduced; through a calcium carbonate pore-forming technology, the microspheres have an accurate pore structure, so that loading of cells and stable release of drugs are facilitated, the release rate is controlled, and the treatment effect is improved.

The invention relates to the field of preparation of waste gas adsorption materials, in particular to a preparation method of carbon aerogel for air purification. Comprising the following steps: (1) uniformly mixing a natural polymer and deionized water to prepare a solution, then adding a cross-linking agent, stirring in a water bath, pouring the solution into a mold after the cross-linking reaction is finished, and standing; (2) putting the composite hydrogel obtained in the step (1) above a cuboid steel tank filled with liquid nitrogen, and directionally freezing the composite hydrogel; after complete freezing, demolding the sample, and performing freeze drying to obtain aerogel; (3) dipping the aerogel material obtained in the step (2) in an activating agent solution, and then drying in a vacuum drying oven; and then putting into a tubular furnace for heat treatment, and washing with water to obtain the carbon aerogel material with the graded porous structure. Compared with traditional activated carbon, the material is richer in pore structure and wider in application range; and heat accumulation is not easily caused to cause spontaneous combustion, so that the safety is greatly improved.

The invention provides a water-based suspension pesticide composition. The water-based suspension pesticide composition comprises the following components: a solvent deionized water; based on the mass of the solvent, the core-shell structure active particles account for 0.5-20w%; based on the mass of the solvent, 0.01-5w% of a suspension stabilizer; the core-shell structure active particles are humidity response microspheres resistant to acid and alkali, the core-shell structure active particles are used, intermolecular acting force is reduced, particle agglomeration is reduced, dispersity of active ingredients is improved, a natural polymer material is adopted as a shell, biocompatibility is good, biodegradability is achieved, pollution to the environment is reduced, and the core-shell structure active particles are environmentally friendly. Meanwhile, the PEG-PCL block copolymer is introduced, so that the pesticide release rate can be accurately controlled according to the environment humidity change, and the pesticide utilization rate is increased. Moreover, the chitosan-sodium alginate composite gel of the particle shell layer is stably and slowly released in neutral and weakly alkaline soil, in acidic and strongly alkaline environments, the microspheres are prevented from collapsing, the stability of the particle slow-release system in soil with different PH values is improved, and the application range of the active particles is expanded.

The invention relates to an application of carboxylated chitin or carboxylated chitosan in promoting insect-killing fungi to prevent and treat diseases and insect pests. Research finds that carboxylated chitin or carboxylated chitosan can significantly promote spore germination and hypha growth of insecticidal fungi, also can significantly enhance stress resistance of the insecticidal fungi, significantly enhance toxicity of the insecticidal fungi to pests, improve ultraviolet resistance and high temperature resistance of the insecticidal fungi, and improve the insecticidal activity of the insecticidal fungi. The invention also finds that the carboxylated chitin or chitosan can effectively inhibit the growth of Xanthomonas oryzae pv. Oryzae. Therefore, the carboxylated chitin or the carboxylated chitosan can be used for preparing a product for enhancing the insecticidal fungus effect and a product for preventing and treating the rice bacterial leaf blight, and the prevention and treatment of plant diseases and insect pests are realized. In addition, carboxylated chitin and carboxylated chitosan are derived from natural polymer materials, have the characteristics of safety, no toxicity, biodegradability, environmental friendliness and the like, are environment-friendly and economical, and have wide application prospects and market values.