7531 results about "Foaming agent" patented technology

The invention relates to the technical field of polyurethane production, in particular to a polyurethane super-hydrophobic foam composite material for packaging and a preparation method thereof. The polyurethane super-hydrophobic foam composite material for packaging is prepared by reacting a component A and a component B according to a mass ratio of 100: (31.7-46.5), wherein the component A comprises polyether polyol X with high molecular weight and high activity, polymer polyol, a chain extender, a cross-linking agent, an organic metal catalyst, a tertiary amine catalyst, a foam stabilizer, a foaming agent, a flame retardant, inorganic filler and the like, and the component B is isocyanate modified by polyether polyol Y with high functionality. An ester bond, a rigid benzene ring group and a Si-O-Si chain segment are introduced into a polyether polyol molecular chain segment to improve the internal soft segment structure and chemical crosslinking density of the polyurethane foam, and the prepared super-hydrophobic polyurethane foam not only has excellent hydrophobicity and high temperature resistance, but also is low in density and good in mechanical property.

A fireproof magnesium oxide board is prepared by mixing the following raw materials, the raw material names and weight parts are as follows: 80-100 parts of magnesium oxide; 20-30 parts of anhydrous magnesium chloride; 10-20 parts of modified expanded vermiculite foaming agent; 20-30 parts of aluminum silicate fiber; 5-10 parts of sawdust; 10-15 parts of fly ash; 8-12 parts of glass magnesium board crushed powder; 1.5-5 parts of non-woven fabric; 10-20 parts of water; wherein the modified expanded vermiculite is prepared by the following steps: (1) Vermiculite is incompletely expanded and calcined; (2) acrylic acid monomer, sodium hydroxide, acrylamide monomer, initiator potassium persulfate, crosslinking aid pentaerythritol polyglycidyl ether, incompletely expanded vermiculite, and water are taken, stirred evenly and ultrasonically dispersed to obtain a first reaction solution, which is placed in a reactor for reaction to obtain a gel material; (3) the gel material is preliminarily crushed and dried, and then further crushed in a ball mill to obtain a fire-resistant expanded vermiculite with water absorption performance.

The invention discloses efficient sound-absorbing lightweight aggregate foam concrete as well as a preparation method and application thereof, and belongs to the field of inorganic non-metallic materials. The high-efficiency sound-absorbing lightweight aggregate foam concrete is prepared from the following components in parts by weight: 85 to 95 parts of a sulfur-aluminum-iron series low-carbon cementing material, 5 to 15 parts of an auxiliary cementing material, 0.6 to 1.5 parts of a functional additive, 20 to 60 parts of unfired lightweight aggregate, 0.35 to 0.45 part of water and 0.5 to 1.5 L of prefabricated foam, the baking-free lightweight aggregate comprises the following components in parts by weight: 40-50 parts of a sulfur-aluminum-iron series low-carbon cementing material, 50-60 parts of byproduct gypsum, 0.7-1.5 parts of a chemical foaming agent, 15-22 parts of water and 5-8 parts of expanded perlite. According to the invention, a multi-stage-multi-scale pore structure body with expanded perlite pores, hydrogen peroxide foaming pores and physical foaming pores is constructed, so that the balanced broadband sound absorption performance of the material is realized, the sound absorption frequency range is adjustable, the sound absorption and noise reduction coefficient (NRC) of the material is greater than or equal to 0.80, the volume weight is less than or equal to 500 kg / m < 3 >, and the breaking strength is greater than or equal to 1.5 MPa.

The invention discloses an embolism part for peripheral arteriovenous vessels, the embolism part comprises an anchoring part and a blocking part fixedly connected with the anchoring part, the blocking part adopts polyurethane shape memory foam, the expansion rate of the polyurethane shape memory foam is 50-100 times, and a preparation method of the polyurethane shape memory foam comprises the following steps: step 1, preparing a polyurethane shape memory foam material; the preparation method comprises the following steps: preparing a polyurethane acrylate prepolymer from macromolecular polyol, diisocyanate, a chain extender containing disulfide bonds, other micromolecular chain extenders and an acrylate end-capping reagent; and 2, uniformly mixing the polyurethane acrylate prepolymer, a foaming agent, a foaming promoter and a photoinitiator to obtain a foaming solution, and sequentially carrying out light curing and foaming on the foaming solution to obtain the polyurethane shape memory foam. According to the embolism part, the polyurethane shape memory foam is adopted as the blocking part, the blocking part applies radial acting force to the wall of the blood vessel all the time based on the expansion trend of the blocking part, and the blocking part and the anchoring part jointly act and can be stably maintained in the blood vessel.

The invention discloses a foam base fluid, a preparation method and a preparation method of a temperature-resistant and salt-resistant CO2 foam flooding system.The foam base fluid comprises a foaming agent, a foam stabilizer and water, the foaming agent is a betaine type surfactant, and the foam stabilizer is a biological polysaccharide polymer. A temperature-resistant and salt-resistant foam base solution and a biological polysaccharide reinforced CO2 foam oil displacement system are obtained by introducing a biological polysaccharide polymer as a foam stabilizer and combining with a betaine type surfactant, so that the problem that the viscosity of polyacrylamide as a traditional foam stabilizer is reduced and even fails in a high-temperature and high-salt environment is effectively solved; the stability of CO2 foam can be obviously improved. Meanwhile, the biological polysaccharide polymer has the characteristics of environmental friendliness and degradability, and can effectively reduce the negative influence on the environment. In addition, due to rich resources and low price of the biological polysaccharide, the system is competitive in cost, and the economic benefit of the oil field can be further improved.

The invention relates to the technical field of barium hydroxide, and discloses a preparation method of barium hydroxide octahydrate. Epoxidized soybean oil and iminodiacetic acid react to obtain a sodium iminodiacetate modified epoxidized soybean oil trapping agent. According to the method, witherite raw ore is used as a raw material, a sodium iminodiacetate modified epoxidized soybean oil trapping agent, an inhibitor and a foaming agent are added for separation and mineral separation, the separation recovery rate of the obtained high-grade witherite reaches 83.7-91.5%, and the grade reaches 57.7-63.8%. The high-grade witherite is used as a barium source, the yield of the prepared barium hydroxide octahydrate reaches 91.0-91.8%, and the purity of the prepared barium hydroxide octahydrate reaches 97.5-98.7%.

The invention relates to the technical field of high polymer material processing, in particular to an insulation board extrusion molding control method and system.The method comprises the steps that 1, multi-dimensional parameters are collected in real time, at least three detection sections are arranged on an outlet section of a die head of an extruding machine in the material flowing direction, and each section synchronously collects the following data; 2, evaluating the rheological state of the melt in real time; 3, dynamically reconstructing a temperature field, dividing the die cavity into an axial independent temperature control section and a circumferential heating unit, and dynamically adjusting the power of the heating unit according to a state judgment result in the step 2; 4, pressure-rotating speed cooperative compensation is carried out; and 5, closed-loop verification is carried out, the density uniformity of the formed plate is detected after the adjustment instruction is executed, and if the density range exceeds the limit, the step 2 is executed again. By accurately controlling the temperature and the concentration of the foaming agent, the feasibility of high-proportion mixing of the reclaimed material is optimized, the quality fluctuation caused by temperature and viscosity fluctuation is reduced, and green manufacturing, energy conservation and consumption reduction are promoted.

The invention discloses a foam cement-based sound absorption material with an adjustable and controllable pore structure and a preparation method of the foam cement-based sound absorption material, and belongs to the technical field of building functional materials. Aiming at the problems of insufficient pore structure regulation and control, limited sound absorption performance and high cost of a traditional cement-based sound absorption material, P.O42.5R Portland cement is used as a basis, a physical-chemical synergistic foaming method and a three-stage gradient temperature control freeze-drying process are combined through the synergistic effect of a composite foaming agent, a microporous structure regulator and a composite pore forming agent, and the sound absorption material is prepared. Precise regulation and control of pores from the nm level to the mm level are achieved, and an interconnected pore channel network with the high open porosity is formed. The density of the obtained material is 200-1000 kg / m, the porosity is 60-90%, the aperture coverage range is 2 nm-6 mm, the open porosity is 70-85%, the 28d compressive strength is 1.83-14.56 MPa, the average sound absorption coefficient in the frequency range of 250-2000 Hz is 0.12-0.62, and the noise reduction coefficient is 0.14-0.64. The composite material has the characteristics of adjustable pore structure, light weight, high strength, broadband sound absorption, low cost and good durability, and is suitable for the noise control fields of building walls, traffic facilities and the like.

The invention relates to the field of building materials, and discloses a multifunctional foamed ceramic sound insulation and heat preservation material for buildings. Comprising the following raw materials in parts by weight: 42 to 48 parts of pottery clay tailings, 14 to 16 parts of fly ash, 10.5 to 12 parts of crushed stone materials, 2.8 to 3.2 parts of a silicon carbide foaming agent, 0.7 to 0.8 part of a borax fluxing agent, 7 to 8 parts of paraffin / silicon dioxide phase change microcapsules, 0.5 to 1.0 part of graphene, 2.0 to 2.5 parts of nano iron powder, 0.05 to 0.5 part of nano silver, 1.0 to 1.5 parts of photocatalytic titanium dioxide and 0.3 to 0.4 part of a fluorosilane coupling agent. A stable matrix structure is constructed through the argil tailings, the fly ash and the crushed stone materials, the silicon carbide foaming agent and the borax fluxing agent reduce the heat conductivity coefficient, the sound insulation performance is improved, the material is endowed with the antibacterial ability through nano-silver and photocatalytic titanium dioxide, indoor sanitation is guaranteed, and a super-hydrophobic layer is constructed through the fluorosilane coupling agent.

The invention relates to the technical field of solid waste treatment, in particular to a flotation method and system for waste incineration fly ash decontamination and calcium conservation. The method comprises the steps that waste incineration fly ash is placed in a natural environment to be subjected to a natural carbonation reaction till the pH value is 7-9, pretreated fly ash is obtained and mixed with water, and then a collecting agent and a foaming agent are added for flotation separation; or mixing the waste fly ash by using the sulfuric acid aqueous solution as the flotation liquid, and then adding the collecting agent and the foaming agent for flotation separation; wherein the collecting agent is one or more of butyl xanthate, ammonium dibutyl dithiophosphate and N, N-diethyldithiocarbamate. By means of the method, heavy metal and chlorine salt in the fly ash can be removed, Ca-based components in the fly ash can be reserved, and therefore resource utilization of the waste incineration fly ash is achieved to the maximum extent.

The invention discloses application of a combined collecting agent in flotation of low-grade copper oxide ore, and belongs to the technical field of beneficiation flotation reagents. The combined collecting agent comprises a chelating agent and a xanthate collecting agent, the chelating agent is benzyl-N, N-dimethyl dithiocarbamic acid, the xanthate collecting agent is amyl xanthate, and the combined collecting agent is used for flotation of low-grade copper oxide ore. Ore is subjected to crushing, ore grinding, coarse separation and pulp mixing to obtain ore pulp to be floated, a gangue inhibitor is firstly added into the ore pulp, then sodium sulfide is added to activate copper oxide ore, and after activation, a combined collecting agent and a foaming agent are sequentially added to recover copper oxide minerals in the ore. Compared with a single xanthate collecting agent, the low-grade copper oxide ore combined collecting agent is small in agent dosage and convenient to add, the dosage of amyl xanthate serving as a collecting agent and the dosage of sodium sulfide serving as a vulcanizing agent are reduced, the beneficiation cost is reduced while the flotation recovery rate and grade of low-grade copper oxide ore are improved, and the low-grade copper oxide ore combined collecting agent is an environment-friendly agent.

The invention discloses an energy storage power station safety management system capable of realizing thermal runaway grading early warning based on flame-retardant foaming, which is characterized in that a battery module is quickly wrapped and isolated from oxygen by controlling refrigerant spraying and triggering a foaming device to start, a large amount of high-temperature-resistant flame-retardant foaming agent is quickly released, and the thermal runaway grading early warning is realized by combining the refrigerant spraying with a foaming material. The further spreading risk of thermal runaway of the battery module is avoided, and safety management of the energy storage power station is achieved. By controlling the valves, switching of different operation modes can be achieved, and safety management of graded early warning of thermal runaway of the energy storage power station is achieved. According to the system, two stages of grading early warning stages are set for the battery of the energy storage power station, a battery cooling operation mode of the second-stage early warning stage and a battery thermal runaway blocking mode in the first-stage early warning mode are achieved, the battery operation temperature can be reasonably regulated and controlled, the battery operation efficiency is improved, and the energy storage power station is protected. And the risk propagation of thermal runaway of the battery is effectively blocked.

The invention belongs to the technical field of shoe materials, and particularly relates to a high-elasticity shoe material and a preparation process thereof. The high-elasticity shoe material comprises the following components in parts by weight: 70-80 parts of thermoplastic polyurethane elastomer; 10 to 20 parts of an ethylene-vinyl acetate copolymer; 15 to 20 parts of an ethylene-octylene copolymer; 10 to 15 parts of nitrile rubber; 8-10 parts of a composite antibacterial agent; 2-4 parts of a foaming agent; 0.6-1 part of zinc oxide; 1-2 parts of an antioxidant; 10-15 parts of a composite filler; the components are subjected to a blending foaming process to prepare the shoe material which is moderate in hardness, light in weight and high in elasticity, and the prepared shoe material also has good strength, wear resistance, yellowing resistance, antibacterial property and flame retardance.

The invention discloses a preparation method of atmospheric water collection porous gel, and belongs to the technical field of environmental ecological restoration, the method comprises the following steps: S1, dissolving a monomer, a foam stabilizer and a foaming aid in an acidic solution, and stirring to form a solution A; s2, mixing N, N '-methylene bisacrylamide, tetramethylethylenediamine and an initiator with the solution A to form a solution B; s3, mixing and stirring a foaming agent and the solution B, and standing for reaction to form a substrate C; s4, drying the matrix C, and immersing the matrix C into the solution D for reaction to form a precursor E; and S5, drying the precursor E to obtain the atmospheric water collection porous gel material. The problems that in the prior art, the preparation process is complex, and the foaming process is uncontrollable are solved.

The invention discloses water-based formaldehyde-free woodworking glue and a preparation method thereof, and relates to the technical field of woodworking glue. When the water-based formaldehyde-free woodworking glue is prepared, firstly, n-butyllithium is used as an initiator to initiate cyclosiloxane and an acrylate monomer to be polymerized, then dimethyl chlorosilane is used for blocking to obtain pre-modified polyacrylate, and the pre-modified polyacrylate is used for preparing the water-based formaldehyde-free woodworking glue. Reacting the pre-modified polyacrylate with vinyl diphenylphosphine, and then reacting with 3-(4-bromophenyl)-1-propylene to obtain modified polyacrylate; secondly, reacting the 4-(trimethoxysilyl) butyraldehyde modified silicon dioxide with chitosan, and then reacting with mercaptoacetic acid to obtain modified silicon dioxide; finally, mixing the modified polyacrylate, the modified silicon dioxide, an emulsifier, a defoaming agent, pure water and a photoinitiator to obtain the water-based formaldehyde-free woodworking glue. The water-based formaldehyde-free woodworking glue prepared by the invention has flame retardance and antibacterial property.

The invention relates to the technical field of concrete, and particularly discloses ultralow-density foam concrete and a preparation method thereof. The ultralow-density foam concrete is prepared from the following raw materials in parts by weight: 35 to 60 parts of cement, 15 to 25 parts of steel slag, 8 to 15 parts of lightweight aggregate, 1 to 3 parts of reinforced fiber, 0.5 to 1 part of a foaming agent, 0.1 to 0.3 part of a stabilizer, 0.3 to 0.5 part of a foaming aid and 30 to 70 parts of water, the foaming aid is at least one of aluminum powder, silica fume, calcium stearate and triethanolamine, and the foaming agent is one of an animal protein foaming agent and a rosin foaming agent; the foaming agent and the foaming aid are combined, a stable foam structure is formed in a concrete system, meanwhile, the phenomena of foam merging and foam breaking are reduced, formation of communicating holes is reduced while the foam hole structure is refined, the stability of foam concrete bubbles is improved, and foam collapse is reduced.

A method of manufacturing a foam component includes generating, via a computer aided design (CAD) software, three-dimensional data corresponding to the foam component. The method further includes scaling, using the CAD software, the three-dimensional data to correspond to a preform. The preform is smaller than the foam component based on a scaling factor. The method further includes fabricating the preform from a thermoplastic elastomer and adding a foaming agent to the preform. The method further includes foaming the preform by exposing the preform to a target temperature for a target time via a heat generating device.

The invention provides an axial anti-pulling water-blocking cable, and relates to the technical field of water-blocking cables, a cable core is spirally twisted on a central anti-pulling bearing unit, the central anti-pulling bearing unit is used for bearing main pulling force, and due to the winding mode of the cable core, when the cable core is subjected to pulling force, the cable core can be prevented from being damaged. The cable core can extrude the central tensile bearing unit towards the center so as to obtain a certain extension buffer space, so that the conductor is prevented from being broken, and the liquid foaming agent capsule in the central tensile bearing unit is extruded and broken by utilizing an extrusion force exceeding a limited value; therefore, the first foaming agent in the cable penetrates through the woven central tensile bearing unit to be combined with the second foaming agent in the twisting gap of the cable core, a large amount of foam colloid is generated, a high-stress area, where water leakage possibly occurs, of the cable is pressurized and subjected to leaking stoppage, and active response to water blocking according to local stress sudden change is achieved. Compared with a traditional passive water blocking technology, the response speed is higher, and the water blocking effect is better.

The invention relates to the technical field of polyurethane foam materials, and provides viscoelastic polyurethane foam and a preparation method and application thereof.The viscoelastic polyurethane foam prepared through the preparation method has the advantages of being rapid in curing and high in production efficiency, meanwhile, the viscoelastic polyurethane foam low in density and good in physical performance can be obtained, and the viscoelastic polyurethane foam is suitable for being used in the field of polyurethane foam materials. The technical requirements of automobile sound insulation pad foam can be met. According to the preparation method, materials comprising an isocyanate reactive component and isocyanate are subjected to a reaction to obtain the viscoelastic polyurethane foam, wherein the isocyanate reactive component comprises a polyether polyol composition and a foaming agent; the polyether polyol composition is prepared from polyether polyol A1 and polyether polyol A2; the use amount of the polyether polyol A1 is 25-65 parts by mass, the use amount of the polyether polyol A2 is 30-70 parts by mass, and the use amount of the foaming agent is 3-6 parts by mass.

The invention discloses a preparation method and application of a bimetal organic framework composite fiber membrane, and the preparation method comprises the following steps: 1) adding polyacrylonitrile, an organic ligand and a pore-foaming agent into an organic solvent, uniformly stirring and mixing at room temperature, carrying out electrostatic spinning to obtain primary fibers, and soaking the primary fibers to remove the pore-foaming agent, so as to obtain primary fibers; drying to obtain a polyacrylonitrile nanofiber membrane containing the organic ligand; 2) placing the polyacrylonitrile nanofiber membrane in a mixed solution of bimetallic salt to prepare a fiber membrane containing bimetallic MOF (Co / Zn-MOF) crystal nucleus, and washing the fiber membrane with deionized water for three times; and 3) immersing the fiber membrane into an organic ligand solution, reacting at room temperature, washing with deionized water, and drying to obtain a target product. The antibacterial rate of the bimetallic MOF modified nanofiber membrane prepared by the method in 24 hours can reach 99.5% or above, the removal rate of a common anionic dye solution is 80% or above, and the purpose of efficiently and safely treating industrial wastewater is achieved.

The invention belongs to the technical field of polyurethane soft foam, and particularly relates to hydrophobic high-strength polyurethane soft foam as well as a preparation method and application thereof. The hydrophobic high-strength polyurethane soft foam is composed of a component A and a component B according to the mass ratio of 100: (58-60), and the component A comprises the following raw materials: vegetable oil modified polyester polyol, silane modified polyether polyol, silicone oil, a catalyst, a chain extender and a foaming agent; and the component B comprises the following raw materials and polymerization inhibitors: polyether polyol 1, hydroxyl fluorosilicone oil, pure MDI and liquefied MDI. The hydrophobic high-strength soft polyurethane foam has excellent mechanical property, hydrophobic property and anti-aging property, and also has good elasticity and wear resistance, and when the hydrophobic high-strength soft polyurethane foam is applied to a mouse pad, foam holes are fine, the hydrophobic property is good, and the market demand is met; the invention also provides a preparation method thereof.

The invention relates to the technical field of printing materials, in particular to a 3D printing material, a preparation method and application of the 3D printing material in shoe materials, and the 3D printing material comprises the following raw materials in parts by weight: 35-40 parts of TPU, 10-15 parts of polycaprolactone, 6-9 parts of nano silver powder, 3-5 parts of a compatilizer, 3-4 parts of a foaming agent, 2-3 parts of a foam stabilizer, 1-3 parts of a lubricant and 1-3 parts of an antioxidant. According to the 3D printing material disclosed by the invention, TPU is matched with polycaprolactone, functional aids such as a compatilizer, a lubricant and an antioxidant are added, nano silver powder is added to optimize the antibacterial property of a product, and meanwhile, the added carbon nano tube is blended with a nano attapulgite agent and a supplementing agent for supplementing and adjusting a modified filler to be mutually blended and matched, so that the obtained 3D printing material optimizes the raw material agglomeration property; the antibacterial property, the wear resistance and the mechanical tensile property of the product are improved in a balanced and coordinated manner, and the weather-proof and washing-resistant stability effects of the product are remarkable.

The invention relates to the field of adhesives, in particular to a structural adhesive epoxy composition and a preparation method thereof. The structural adhesive epoxy composition is prepared from the following raw materials: epoxy resin, a toughening agent, a reinforcing agent, filler, a latent curing agent, a latent accelerant, a chemical foaming agent, a physical foaming agent and the like. Finally, the epoxy composition prepared by the invention can be used as a structural adhesive raw material, has ultrahigh expansion rate, low-temperature rapid curing capacity and structural adhesive property, and also has good mechanical properties and excellent comprehensive application effect, so that the complex requirements of the application field of the prior art on the structural adhesive raw material are met.

The invention discloses an anti-shrinkage light, soft and elastic sole foaming material and a preparation method thereof, and belongs to the technical field of footwear products. The light, soft and elastic sole foaming material is formed by chemically foaming an EVA (Ethylene Vinyl Acetate) composite raw material, the EVA composite raw material is prepared from 50 to 70 parts of EVA, 20 to 40 parts of olefin thermoplastic elastomer, 10 to 20 parts of styrene elastomer, 1.5 to 3 parts of maleic anhydride grafted ethylene-octylene copolymer compatilizer, 0.4 to 0.8 part of peroxide cross-linking agent, 3 to 4 parts of foaming agent, 1 to 1.5 parts of zinc oxide, 1 to 1.5 parts of polyethylene wax substance and 0.5 to 1.5 parts of poly (butylene succinate). 0.3 to 1 part of polyamide 12 microspheres and 2 to 3 parts of nano montmorillonite. The foaming material can resist shrinkage when being used as a shoe sole part, and has good rebound performance and the like, so that the high-quality requirement of sneakers, the mass production stability and the like are met.

The invention discloses gel foam for preventing spontaneous combustion of coal, and belongs to the technical field of gel foam fire extinguishing. The gel foam comprises the following components: 0.1-0.5% of a composite foaming agent, 5-15% of a gelling agent, 0.1-0.5% of a cross-linking agent and the balance of water, the composite foaming agent is sodium lignin sulfonate and sodium fatty alcohol polyoxyethylene ether carboxylate; the gels are silica sol and sodium alginate. The gel foam has excellent water-retaining property, and can relieve water loss and weight loss of coal; the flame retardant can effectively hinder the contact between coal and oxygen, interrupt the free radical chain reaction of coal and avoid the oxidation weight gain of coal, and has an excellent flame retardant effect; in the combustion process, less heat is generated, and the smoke suppression effect is excellent. The gel foam does not contain antioxidants and flame retardants, can avoid environmental pollution, is an environment-friendly anti-oxidation gel foam, and can be used as an efficient fire preventing and extinguishing material in the field of preventing spontaneous combustion of coal.

The invention relates to chitin-based acrylic resin and a preparation method thereof, and belongs to the technical field of intersection of high value-added utilization of biomass resources and acrylic resin. The chitin-based acrylic resin is prepared from the following components in parts by weight: 30 to 50 parts of acrylic modified chitin, 20 to 30 parts of acrylic monomer, 10 to 20 parts of polyaldehyde monomer, 5 to 10 parts of polybasic organic amine, 1 to 5 parts of emulsifier, 0.1 to 0.5 part of initiator, 0.2 to 0.4 part of defoaming agent and 80 to 120 parts of deionized water. According to the method, forestry and agricultural residues are used as raw materials, chitin with small molecular chains is obtained through deacetylation treatment of chitin, meanwhile, a large number of primary amino groups with high chemical reaction activity are exposed on the surfaces of the molecular chains of the chitin, and organic acrylic aldehyde is further utilized to react with the chitin; acrylic acid groups are successfully grafted to chitin molecular chains to be subjected to polymerization reaction with acrylic acid monomers to form macromolecule resin, meanwhile, the macromolecule resin is subjected to cross reaction with polyaldehyde and polybasic organic amine to generate net-shaped crosslinking, and the strength of the acrylic resin after film forming is improved.

The invention relates to the field of sponge materials, and provides an antibacterial degradable sponge material and a preparation method thereof. The material is prepared from protocatechuic acid modified quaternized chitosan, quaternary ammonium salt grafted gelatin, sodium alginate, polyhydroxybutyrate, polycaprolactone, a polylactic acid-glycolic acid copolymer, hexamethylene diisocyanate, a foaming agent, nano cellulose, vitamin E, polyethylene glycol, triethylamine and dimethylformamide. Protocatechuic acid and quaternized chitosan are subjected to amidation modification, and chitosan and gelatin are subjected to quaternization treatment by adopting 2, 3-epoxypropyl trimethyl ammonium chloride, so that the antibacterial property and biodegradability of the material are improved. In the material preparation process, through vacuum degassing, foaming vacuum degree and humidity control and a multi-step drying process, it is ensured that the average pore size of the material is uniform (50-200 microns) and the porosity is high (50%-90%), and the obtained material has excellent antibacterial property and degradability and has wide application value.

The invention provides a method for preparing porous iron phosphate through an emulsion reaction. The method comprises the following steps: (1) reacting an iron source and a phosphorus source according to a certain proportion to prepare an iron phosphate precursor; (2) reacting the iron phosphate precursor with a foaming agent to obtain emulsified iron phosphate dihydrate; (3) adding a cross-linking agent for further emulsification and dispersion, and adding a curing agent to obtain cured iron phosphate dihydrate; and (4) drying, calcining and crushing the iron phosphate dihydrate to obtain the porous iron phosphate. The method is specifically characterized in that the porous iron phosphate with the three-dimensional foam structure is finally obtained through the processes of emulsification foaming, curing reaction, calcination pore-forming and the like in sequence in the iron phosphate preparation process. The iron phosphate material prepared by the method has rich three-dimensional reticular porous structures, high specific surface area and high porosity. The lithium iron phosphate material prepared from the precursor material is high in electronic conductivity and can adapt to a high-rate lithium iron phosphate process. In addition, the raw materials used in the preparation process are cheap and easy to obtain, the preparation process is stable and controllable, and the iron phosphate prepared by the process has better application value and economic value.

The invention relates to a wave-absorbing and vibration-reducing method for dynamic disturbance of an asymmetric high-stress tunnel, which belongs to the technical field of tunnel excavation, and specifically comprises the following steps: step 1, determining the position, range and depth of an asymmetric stress concentration area or a rockburst potential risk area behind a high-stress tunnel face, and determining the position, number and depth of grouting holes; 2, preparing and grouting a wave-absorbing material, and solidifying the wave-absorbing material, wherein the wave-absorbing material comprises the following components: cement, water, a foaming agent, polyacrylonitrile fiber and rubber powder; thirdly, monitoring holes are drilled in the middle and the two ends of the wave-absorbing grouting area, and a vibration sensor is placed in each monitoring hole; and 4, after the vibration sensor monitors that the high-energy disturbance stress wave is transmitted, obtaining an amplitude value through the waveform of the disturbance wave to obtain the main frequency of the disturbance wave. The specific position of wave-absorbing grouting is provided for a rockburst risk area, and the disturbance wave monitoring method provided by the invention can realize disturbance wave attenuation effect evaluation for various disturbance waves.

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.