71 results about "Dimethylammonium chloride" patented technology

The invention discloses a preparation method of a composite flocculant based on efficient water treatment, belongs to the technical field of flocculant processing, and aims to solve the technical problem that the flocculation performance and the settling performance of a flocculant need to be further improved in the prior art. The preparation method specifically comprises the following steps: putting acrylamide, diallyldimethylammonium chloride, 2-hydroxypropyl methacrylate and deionized water into a reaction kettle, and uniformly mixing to obtain a mixed monomer; according to the preparation method, citric acid monohydrate and iron nitrate nonahydrate react under a mild acidic condition to form a Fe < 3 + >-citric acid complex, and then 2-hydroxyethylamine is introduced to further participate in complexing to obtain a citric acid complexing solution, so that not only is the flocculation performance of the composite flocculant improved, but also the settling performance of the composite flocculant is improved.

The described invention is a disinfectant that has a bactericidal and fungicidal effect. Optimally, the agent is diluted more than 70 times before use, thereby achieving pH neutrality of the solution. The agent is also effective, bactericidal and fungicidal, and when diluting the final formulation up to 200 times. The improvement of the disinfectant is based on the presence of the active substance didecyldimethylammonium chloride. The agent also contains sodium chlorite. In this invention, polyethylene glycol, in addition to the function of a polymer carrier, also has the function of a stabilizer of the solution of the active substance, a non-ionic surfactant.

The application discloses an active oxygen response type bacteriostatic and repair promoting hydrogel and a preparation method and application thereof, the hydrogel is formed by disulfide bond cross-linked hydrogel in response to active oxygen free radicals in the vagina of vaginitis patients through thiol modified hyaluronic acid (HASH), and can enhance in-vivo retention by thiol and vaginal tissue interaction. Cationic surfactant such as didecyldimethylammonium chloride (DDAC) as the bacteriostatic component of the hydrogel, efficiently killing pathogenic bacteria while having good biocompatibility, and is not prone to cause bacterial drug resistance. As a natural immune regulator, beta-glucan regulates the vaginal microenvironment, promotes the polarization of macrophages into anti-inflammatory M2 type and promotes cell migration, etc., to promote the repair of the vaginal immune barrier, regulate the vaginal flora, and reduce the probability of vaginitis recurrence. The HASH hydrogel provides an efficient, convenient and highly transformative potential strategy to provide more choices for the treatment of vaginitis.

The invention belongs to the technical field of photovoltaic cell processing materials, and relates to an RCA cleaning additive for a TOPCon cell POLY FINGER process and a preparation method of the RCA cleaning additive. The invention relates to an RCA cleaning additive for a TOPCon battery POLY FINGER process. The RCA cleaning additive comprises the following substances in parts by weight: 0.5-5 parts of a protective agent; 0.1 to 2.0 parts of a catalyst; 0.2 to 3.0 parts of a stabilizing agent; 0.3 to 2.5 parts of a selective adsorbent; 0.1 to 3.0 parts of a surfactant; 0.05 to 1.0 part of a defoaming agent; the protective agent is prepared from at least two of sodium 3-carboxybenzenesulfonate, tetraethyl ammonium acetate, methyl tributyl ammonium chloride, benzyl trimethyl ammonium chloride and bis (2-ethoxyl) dimethyl ammonium chloride. The selection range of the core component and the protective agent of the RCA cleaning additive is defined, and a multi-component synergistic effect system is constructed through reasonable matching. According to the present invention, the problems of single protection and non-uniform corrosion of the existing additive are effectively solved, the corrosion requirement of the laser region can be met, the POLY layer can be comprehensively protected, the foundation is laid for the subsequent battery passivation and the performance improvement, and the core cleaning requirement of the TOPCon battery POLY FINGER process can be met.

The invention provides an MgAl2O4 carrier as well as a preparation method and application thereof, and relates to the technical field of catalysts. The preparation method comprises the following steps: mixing urea, soluble aluminum salt, soluble magnesium salt, polydiene dimethyl ammonium chloride and water, and carrying out a hydrothermal reaction to obtain a precipitate; the molar ratio of the urea to the aluminum element in the soluble aluminum salt to the magnesium element in the soluble magnesium salt to the polydiene dimethyl ammonium chloride is 4.5: 2: 1: (1-2); and sequentially drying and calcining the precipitate, so as to obtain the MgAl2O4 carrier. The prepared MgAl2O4 carrier is used as a catalyst carrier to be used in a high-temperature and high-pressure methane and carbon dioxide dry reforming reaction, excellent stability is shown, and the MgAl2O4 carrier is evaluated for 230 h under the high-temperature and high-pressure conditions of 850 DEG C and 2 MPa, has no obvious difference in morphology before and after the reaction, has small change in specific surface area, and shows excellent mechanical strength and chemical stability.

The application provides a MgAl2O4 carrier and a preparation method and application thereof, and relates to the technical field of catalysts. Urea, a soluble aluminum salt, a soluble magnesium salt, polydiallyldimethylammonium chloride and water are mixed to carry out a hydrothermal reaction to obtain a precipitate; the molar ratio of the urea, aluminum elements in the soluble aluminum salt, magnesium elements in the soluble magnesium salt and the polydiallyldimethylammonium chloride is 4.5:2:1:(1-2); the precipitate is sequentially dried and calcined to obtain the MgAl2O4 carrier. The prepared MgAl2O4 carrier is used as a catalyst carrier in a high-temperature and high-pressure dry reforming reaction of methane and carbon dioxide, and excellent stability is exhibited; under high-temperature and high-pressure conditions of 850 DEG C and 2 MPa, the MgAl2O4 carrier is evaluated for 230 hours, and the morphology of the MgAl2O4 carrier before and after the reaction has no obvious difference, the specific surface area changes little, and excellent mechanical strength and chemical stability are shown.

This invention relates to the field of chemical additives for oil and gas field development. It discloses an oil and gas field bactericide and its preparation method, comprising the following components by mass percentage: glutaraldehyde 8%-18%; quaternary ammonium salt 12%-22%; disodium ethylenediaminetetraacetate 2%-6%; polyethylene glycol 400 1%-3%; and the balance being water. The quaternary ammonium salt is a mixture of dodecyl dimethyl benzyl ammonium chloride and disedecyl dimethyl ammonium chloride in a mass ratio of 1.5:1-2.5:1. This invention, through synergistic compounding of multiple components, significantly improves the stability of the bactericide under high temperature, high mineralization, and weakly alkaline environments, achieving an active substance retention rate of ≥92% after 72 hours. This solves the problems of easy degradation of glutaraldehyde and poor stability of conventional formulations. The product has a broad bactericidal spectrum and good long-lasting effect, with low concentrations effective against three key types of bacteria, inhibiting microbial corrosion and blockage. The compounded system is less prone to drug resistance, and the preparation process is mild and simple, suitable for industrial production, and can meet the long-term stable bactericidal requirements of oil and gas fields.

This invention belongs to the technical field of rubber hoses, specifically relating to an antibacterial hose for conveying food and its manufacturing process. It comprises an inner rubber layer coated with a quaternary ammonium salt antibacterial agent, a reinforcing layer treated with the antibacterial agent, and an outer rubber layer treated with antifungal agents. The quaternary ammonium salt antibacterial agent is a compound of food-grade alkyl dimethyl benzyl ammonium chloride and disdecyl dimethyl ammonium chloride. The reinforcing layer is prepared by impregnating / spraying polyester fibers with the quaternary ammonium salt antibacterial agent, followed by drying and curing, and then simultaneously winding and laminating it with food-grade low-density polyethylene. The outer rubber layer is uniformly distributed with a pre-dispersed antifungal agent, effectively inhibiting the growth of mold in the high-temperature and high-humidity environment of food processing. The antibacterial hose is manufactured through a process of spraying the inner rubber layer with the antibacterial agent, impregnating the reinforcing layer with the antifungal agent, pre-dispersing the antifungal agent, and mixing. This process achieves beneficial effects such as a >99.99% inhibition rate against common pathogenic bacteria, long-lasting antibacterial performance, zero-mold growth on the outer rubber layer (grade 0), stable mechanical properties, and excellent anti-aging properties.

The invention relates to a surfactant for shampoo and a preparation method of the surfactant, and belongs to the technical field of surfactants. The surfactant for shampoo comprises a compound amino acid surfactant and a synergistic surfactant, the composite amino acid surfactant is prepared by taking corn oil, coconut oil and L-alanine as raw materials on the basis of an existing process, and the synergistic surfactant comprises sodium cocoyl isethionate, cocamidopropyl PG-sodium dimethyl ammonium chloride phosphate and potassium cocoyl hydrolyzed oat protein. After the sebum removing agent is added into the shampoo, the sebum removing effect can be better than that of SLES without high proportion and 4% mass content, the substitution effect is excellent, and the performance and the cost are both considered.

An object of the present invention is to provide a hair cosmetic which has an appropriate viscosity and can continuously provide a feeling effect such as hair manageability, finger combability, and softness.SOLUTION: (A) contains (a1) a highly polymerized silicone having a mean polymerization degree of 2000 to 20000 and a silicone having a mean polymerization degree of less than 2000, and (B) contains (b1) a dicocoyldimethylammonium chloride or a three chain-type quaternary ammonium salt-type cationic surfactant, the (C) higher alcohols include (c1) higher alcohols that are liquid at 25 °C and have a branched structure, and higher alcohols other than the (c1) components.SELECTED DRAWING: None

The invention relates to the technical field of high-purity noble metal catalysts, in particular to a preparation method of high-purity iridium powder, which comprises the following steps: iridium dissolution and liquid preparation: adding chloroiridic acid into deionized water, stirring and dissolving, and filtering to remove insoluble substances to obtain an iridium solution A; complexing and precipitating iridium: adding didecyl dimethyl ammonium chloride into the iridium solution A, heating to 80-90 DEG C, separating out a large amount of yellow precipitate, and filtering when the solution becomes colorless from orange red to obtain iridium-containing precipitate B; recrystallization: adding the iridium-containing precipitate B into deionized water for recrystallization, and filtering to obtain an iridium-containing precipitate C; dissolving the iridium-containing precipitate C to prepare a solution, namely adding the iridium-containing precipitate C into dilute ammonia water with the pH value of 8-9 to be dissolved to obtain an iridium solution D, and filtering to remove trace insoluble impurities; and reducing to obtain high-purity iridium powder: adding hydrazine hydrate into the iridium solution D under a micro-boiling condition for reaction, filtering after reduction to obtain iridium powder, boiling and washing with aqua regia, filtering, washing with deionized water, and drying in vacuum to obtain the high-purity iridium powder.

The invention relates to the technical field of welding, and particularly discloses a water-soluble soldering flux and a preparation method thereof. The water-soluble soldering flux comprises the following raw materials in parts by weight: 6-12 parts of a borate covalent activator; 3 to 8 parts of cucurbituril hydrate; 0.01 to 2 parts of a corrosion inhibitor; 1-3 parts of a modified graphene quantum dot solution; 1-5 parts of a cyclic ether solvent; 0.5 to 2 parts of a metal organic framework material containing sulfydryl; 68 to 88.5 parts of deionized water; the modified graphene quantum dot solution is obtained by modifying graphene quantum dots through dioctadecyl dimethyl ammonium chloride. According to the soldering flux, the water-soluble soldering flux is combined with the cyclic ether solvent, so that the problem of later-stage water residue after decomposition and volatilization of an activating agent in the early stage of welding can be effectively solved, the problems of pseudo soldering, bubble defects and the like of welding spots are reduced, and the strength and reliability of the welding spots are effectively improved.

The invention relates to the technical field of packaging materials, in particular to a multi-layer high-barrier paper-based composite packaging material and a preparation method thereof.The multi-layer high-barrier paper-based composite packaging material sequentially comprises an outer protective layer, a printing paper base layer, a bonding layer, a high-barrier functional layer, a bonding layer and an inner heat sealing layer from outside to inside; the preparation method of the nano barrier filler contained in the components of the high-barrier functional layer comprises the following steps: step 1, purifying montmorillonite; step 2, modifying dioctadecyl dimethyl ammonium chloride; step 3, grafting with a silane coupling agent; and 4, compounding the graphene oxide. According to the composite packaging film disclosed by the invention, a synergistic barrier network and a filler-flexibilizer interaction network are constructed through a chemical means of organification-coupling-covalent bonding, so that the barrier property, toughness and strength of the material are greatly improved.

The application relates to the field of welding technology, and particularly discloses a water-soluble flux and a preparation method thereof. The water-soluble flux comprises the following raw materials in parts by weight: 6-12 parts of a borate ester covalent activator; 3-8 parts of cucurbituril hydrate; 0.01-2 parts of an inhibitor; 1-3 parts of a modified graphene quantum dot solution; 1-5 parts of a cyclic ether solvent; 0.5-2 parts of a metal-organic framework material containing mercapto groups; and 68-88.5 parts of deionized water. The modified graphene quantum dot solution is obtained by modifying graphene quantum dots with dioctadecyldimethylammonium chloride. The flux of the application can effectively solve the problem of water residue in the later stage after the activator is decomposed and volatilized in the early stage of welding by combining the water-soluble flux with the cyclic ether solvent, thereby reducing the problems of virtual welding, bubble defects and the like of the welding points, and effectively improving the strength and reliability of the welding points.

The application provides an MHM electrode material and a preparation method and application thereof, and belongs to the technical field of electrochemical desalination. The MHM electrode material is Ti3C2T x MXene, polystyrene microspheres are treated by a polydien dimethyl ammonium chloride solution, and then are stirred and reacted with Ti3C2T x MXene, and then are subjected to freeze drying and pyrolysis to obtain the MHM electrode material. The Ti3C2T x MXene is constructed into a three-dimensional spherical structure, the stacking problem of traditional MXene layers is avoided, the advantages of the good conductivity, large surface area and excellent mechanical properties of the Ti3C2T MXene are fully exerted, the structural stability, the electrochemical performance and the desalination capacity are significantly improved, the MHM electrode exhibits excellent adsorption capacity, fast ion transmission rate and good cycle stability in a CDI device, and a new idea is provided for CDI material design.

The application discloses a kind of carbon sequestration type concrete internal curing material based on NaX molecular sieve and preparation method thereof, belong to building material technical field.It is prepared by the following component raw materials by weight fraction: 15%~18% NaX molecular sieve, 8%~10% carboxymethyl cellulose, 6%~8% bagasse cellulose, 5%~10% polyvinyl alcohol, 24%~30% N-methylol acrylamide, 10%~15% maleic anhydride, 3%~4% xanthan gum, 2%~3% calcium silicate, 8%~10% pentaerythritol allyl ether, 10%~13% propylene glycol polyoxyethylene ether, 0.15%~0.2% glycerol dimethacrylate, 0.2%~0.4% triethylene glycol dimethacrylate, 0.3%~0.7% diallyl dimethyl ammonium chloride, 0.08%~0.5% ammonium sulfite, 1%~3% ammonia.The application develops a kind of concrete internal curing material with CO2 capture and storage function, not only presents good alkali absorption characteristics, improves the mechanical properties of concrete, simultaneously realizes carbon sequestration curing and carbon sequestration service in concrete internal curing process and service process, realizes the new building field carbon sequestration mode of CO2 capture-solidification-storage.

This invention relates to the field of mineral processing, providing a method for the separation and enrichment of low-quality lithium ore, comprising the following steps: crushing lithium ore to obtain particles with an average particle size of 1-5 mm; weighing the crushed lithium ore particles and mixing them with solid sodium hydroxide, then ball milling for 1-5 hours; adding water to the ball-milled product and ball milling for 5-20 hours until the average particle size of the solid particles is 1-50 μm; subjecting the ball-milled slurry to strong magnetic separation to obtain magnetic minerals; filtering the non-magnetic slurry, drying it, and obtaining filter residue; adding water to the filter residue to obtain a slurry with a mass concentration of 20%-40%, adding sodium hexametaphosphate to it, adjusting its pH to 7-9, stirring for 3-7 minutes, then adding disaccharidated dimethyl ammonium chloride, stirring for 5-8 minutes, and flotation for 5-10 minutes to obtain lithium concentrate. This method employs a combined approach of alkaline grinding and dissociation, strong magnetic separation, and selective flotation, overcoming the technical bottleneck of efficient enrichment of low-quality lithium ore, and eliminating the need for complex flotation reagents.

The invention relates to the technical field of food packaging materials, discloses a long-acting antibacterial mildew-proof modified PE fresh-keeping packaging film and a preparation method thereof, and aims at solving the problems that an antibacterial agent of an existing antibacterial film is prone to failure, processing thermal degradation is caused, and environment false triggering is caused. The preservative film comprises a PE base material and a mesoporous silica nano-carrier deeply buried at a position of 5-10 [mu] m in the PE base material, the inner wall of a channel of the carrier is covalently modified with a carboxymethyl functional group and is loaded with didecyl dimethyl ammonium chloride, and chemical anchoring is performed through a KH550 silane coupling agent and the PE base material subjected to plasma treatment; only at pH lt; 6 and relative humidity gt; and the release of the antibacterial agent is triggered under the synergistic condition of 80%. According to the scheme, on-demand accurate release, high light transmittance, excellent processing stability and long-acting antibacterial and mildew-proof performance are realized.

The present invention relates to the use of an animal feed additive that reduces the toxic effects of mycotoxins, especially fumonisin B1 and zearalenone. This additive is a mycotoxin adsorbent consisting of an organically modified phyllosilicate with 71% substitution of its cation exchange capacity with the organic compound dioctadecyldimethylammonium chloride.

The present invention provides a liquid laundry detergent composition that reduces dye bleeding from fabrics. [Solution] A liquid laundry detergent composition comprising a surfactant system and a cationic polymer, wherein the liquid laundry detergent composition comprises 5.0% to 60% by weight of the surfactant system, the surfactant system comprises a branched-chain nonionic surfactant, the cationic polymer is selected from poly(diallyldimethylammonium chloride), a copolymer of diallyldimethylammonium chloride and acrylic acid, a copolymer of methacrylate, methacrylamidopropyltrimethylammonium chloride and acrylic acid, and mixtures thereof, the surfactant system comprises the branched-chain nonionic surfactant at a concentration of 1.0% to 10% by weight of the composition, and the cationic polymer is present at a concentration of 0.5% to 2.5% by weight of the composition.

The method for constructing a dual-mode sensing platform for NT-pro BNP detection based on Cd-MoS2 nanoflowers includes the following steps: A: preparation of MoS2; B: preparation of Cd-MoS 2； C: Preparation of cadmium sulfide quantum dots; D: Preparation of gold nanoparticles; E: Preparation of Au NPs@dsDNA; F: Construction of the sensing platform: Cd-MoS2 solution was dropped onto an ITO glass substrate, which was then immersed in a polydimethylammonium chloride solution and a CdS QD solution and activated with 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and N-hydroxysuccinimide. Au NPs@dsDNA were dropped onto the ITO glass substrate and incubated for 1 hour, then immersed in a methylene blue solution and blocked with BSA. NT-pro BNP was dropped onto the ITO glass substrate and incubated for 1 hour. The photocurrent was measured at a wavelength of 450 nm. This invention has good reliability.

The application provides a kind of digital ink-jet special ink and its preparation method, belong to ink technical field, the digital ink-jet special ink includes the following component is made: 30-40 parts by weight water-based binder, 6-10 parts by weight modified color material, 0.3-0.6 parts by weight polyethylene wax, 0.8-1.2 parts by weight film-forming aid, 0.2-0.4 parts by weight leveling agent, 0.1-0.3 parts by weight defoaming agent, 10-20 parts by weight water;Wherein, the water-based binder is obtained by reaction of polysorbate 60, sodium carboxymethyl cellulose, dioctadecyldimethylammonium chloride, sodium bicarbonate, water, core emulsion, shell emulsion and sodium persulfate aqueous solution;The modified color material is obtained by modifying inorganic color material with modified liquid.The digital ink-jet special ink prepared by the application can better adapt to the requirements of digital ink-jet printing by improving components and optimizing formula, has the advantages of strong adhesion, good stability, fast curing, good gloss, green environmental protection and the like.

This invention belongs to the field of solid waste treatment technology, specifically relating to a quaternary ammonium salt ionic liquid microemulsion for heavy oil desorption, its method, and its application. The quaternary ammonium salt ionic liquid microemulsion for heavy oil desorption of this invention, by weight, comprises 0.1-0.8 parts of a quaternary ammonium salt ionic liquid surfactant, 17.2-22.9 parts of n-propanol, 20-25 parts of n-hexane, and 56-59 parts of water; wherein the quaternary ammonium salt ionic liquid surfactant is 1-alkyl-(2-hydroxyethyl)-dimethylammonium chloride. The quaternary ammonium salt ionic liquid microemulsion for heavy oil desorption of this invention is prepared using a quaternary ammonium salt ionic liquid surfactant, n-propanol, n-hexane, and water as raw materials. The microemulsion is an oil-in-water type, characterized by low surface tension, strong solubilizing ability, low dosage, simple treatment process, and recyclability.

This invention discloses an antifouling and antibacterial TPU yacht film and its preparation method, relating to the field of polymer materials technology. In preparing the antifouling and antibacterial TPU yacht film, this invention involves reacting amino POSS with 2-maleimide acetaldehyde, 5-(4-hydroxy-3-methoxy-benzylcarbamoyl)-valeric acid, and ethyl isocyanate to obtain modified POSS; reacting 5-hydroxymethylfurfural with 3-aminopropyl-3-hydroxypropyl dimethylammonium chloride to obtain a chain extender; reacting isophorone diisocyanate sequentially with hydroxyl-terminated methyl-3,3,3-trifluoropropyl (siloxane and polysiloxane) and the chain extender to obtain modified thermoplastic polyurethane; mixing the modified thermoplastic polyurethane with the modified POSS, pouring the mixture into a mold, and thermosetting to obtain the antifouling and antibacterial TPU yacht film. The antifouling and antibacterial TPU yacht film prepared by this invention exhibits excellent antibacterial, antifouling, self-healing, and mechanical properties.

The invention relates to the technical field of cosmetics, and discloses an external-use allergy-relieving itching-relieving bioactive biomimetic membrane skin care preparation and a preparation method thereof.The preparation is prepared from, by weight, red ginseng extract rich in rare ginsenoside, colloidal oat powder, cetostearyl alcohol and distearyl dimethyl ammonium chloride; the preparation method comprises the following steps: firstly, carrying out ultrasonic activation treatment on the red ginseng extract, then carrying out high-temperature emulsification on the oil phase and the water phase, and finally, carrying out programmed control cooling on the obtained emulsion. According to the method, all the components are subjected to in-situ self-assembly on the skin surface to form the layered liquid crystal biomimetic membrane; the biomimetic membrane structure simulates skin cuticle lipid, and can effectively reduce percutaneous moisture loss and repair a skin barrier; meanwhile, as a carrier, rare ginsenoside is promoted to permeate into the skin, so that instant and long-acting allergy-relieving and itching-relieving effects are realized.

The invention discloses a high-elasticity quick-drying fabric and a preparation method thereof. The fabric is prepared from the following raw materials in parts by weight: 20-40 parts of modified natural fibers, 20-40 parts of polyester, 40-80 parts of spandex, 3-8 parts of a moisture absorbent, 3-5 parts of a softening agent and 3-5 parts of an antibacterial agent. According to the fabric, the modified natural fibers and the chemical fibers are compounded and blended, and under the condition that the mechanical property of the fabric is kept, the elasticity and the moisture absorption and sweat releasing performance of the material are enhanced. The elasticity of the material is enhanced through the composite use of the modified giant bamboo fibers and the modified camel hair fibers in the components, the perspiration performance of the material is improved through the combined use of the sericin and the konjac glucomannan, and the fracture resistance of the material is improved through the combined use of the dioctadecyl dimethyl ammonium chloride and the epoxy modified betaine.

The present application relates to the technical field of disinfection in the breeding industry, and specifically discloses a spray composite disinfectant as well as a preparation method and application thereof.The spray composite disinfectant provided by the present application comprises the following components in mass percentage: 0.8-1% of quaternary ammonium salt surfactant, 1-1.5% of alkyl polyglycoside, 5-8% of cosolvent, and the balance of water; wherein the quaternary ammonium salt surfactant is a mixture of modified bisdecyl dimethyl ammonium chloride and hexadecyl dimethyl benzyl ammonium chloride; the alkyl polyglycoside is C12-C14 alkyl polyglycoside; and the modified bisdecyl dimethyl ammonium chloride is gamma-glycidyl ether oxygen propyl trimethoxysilane modified bisdecyl dimethyl ammonium chloride.The spray composite disinfectant provided by the present application is free of chlorine and phenols, is safe and non-toxic, is green and healthy, has a simple preparation and use method, has good compatibility, has good storage performance, and is easy to realize large-scale production.

The invention discloses hollow carbon microspheres as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) synthesizing polymethyl methacrylate microspheres in a water-phase system by taking methyl methacrylate as a raw material and potassium persulfate as an initiator; (2) dispersing the polymethyl methacrylate microspheres obtained in the step (1) in a polydiene dimethyl ammonium chloride solution for surface charge modification; (3) synthesizing a phenolic resin shell layer on the surface of the polymethyl methacrylate microsphere modified in the step (2) to obtain a core-shell polymer; (4) performing high-temperature treatment on the core-shell polymer obtained in the step (3) in an inert atmosphere to obtain hollow carbon microspheres; the method is simple in operation steps and generates less wastewater, and the prepared hollow carbon microspheres are uniform in particles, good in sphericity and easy to adjust in particle size, show excellent performance in an electromagnetic shielding test, reduce the maximum reflection loss and increase the effective wave-absorbing bandwidth.

The application discloses a method for detecting perchlorate based on a silver nanofilm substrate. The application uses polydiene dimethyl ammonium chloride and sodium diethylthio carbamate as a protective agent, polyvinyl pyrrolidone as a stabilizer, and sodium borohydride-ethylene glycol as a reducing agent to obtain polydiene dimethyl ammonium chloride or diethylthio amino modified silver nanoparticles with high activity through one-pot synthesis or microwave synthesis, which are used as a surface-enhanced Raman scattering substrate for the detection of perchlorate. The perchlorate detection technology provided by the application has the advantages of simple preparation process, green and environmentally-friendly synthesis process, high sensitivity and the like, and provides a new technical path for the accurate detection of perchlorate in water.

This invention discloses a composite pyrolysis catalyst for desulfurization before coal combustion and a method for pre-treatment of coal before combustion. The composite pyrolysis catalyst comprises 2-6 parts of a penetrant, 10-40 parts of a swelling agent, and 2-30 parts of a solvent. The penetrant is selected from one or a combination of two or more components selected from azone, linoleic acid, or octadecyl dimethyl ammonium chloride. The swelling agent is selected from one or a combination of two or more components selected from octadecyl dimethyl ammonium chloride, formamide, polyethylene glycol 600, ethylene glycol butyl ether, isopropanol, and propylene glycol methyl ether. The solvent is selected from one or a combination of two or more components selected from propylene glycol butyl ether, ethylene glycol, cyclohexanol, cyclohexanone, dichloromethane, xylene, methanol, and n-butanol. After treatment with this invention, ultra-low sulfur and low ash ultra-pure coal can be obtained, while ensuring that its physical and chemical properties remain unchanged.