171 results about "Methyltrimethoxysilane" patented technology

The invention discloses a quick-curing polyurethane seamless expansion joint material for roads and a preparation method, and belongs to the technical field of road engineering materials. The material is prepared from polyether polyol, polycaprolactone glycol, a bisphenol A epoxy-polyether block isocyanate terminated prepolymer, a methyl phenyl silicon-boron hybrid hydroxyl chain extender, diphenylmethane diisocyanate, calcium carbonate, wollastonite, a hindered amine anti-aging agent and dioctyl phthalate. Wherein the bisphenol A epoxy-polyether block isocyanate terminated prepolymer is prepared by the following steps: reacting bisphenol A with epoxy chloropropane to generate epoxy resin, reacting with polytetramethylene ether glycol, and introducing isophorone diisocyanate; the methyl phenyl silicon-boron hybrid hydroxyl chain extender is prepared by carrying out hydrosilylation and ethylene glycol reaction on methyl trimethoxy silane, 3-glycidyl ether oxypropyl trimethoxy silane and allylboronic acid pinacol ester; and the methyl phenyl silicon-boron hybrid hydroxyl chain extender is prepared by carrying out hydrosilylation on methyl trimethoxy silane, 3-glycidyl ether oxypropyl trimethoxy silane and allylboronic acid pinacol ester. The material has the advantages of quick curing property, weather resistance and high-temperature stability, and is suitable for road seamless expansion joint scenes.

The invention relates to the technical field of thermal insulation materials, in particular to an aerogel felt and a preparation method thereof.The aerogel felt is composed of a composite fiber base material and multi-component aerogel loaded in the composite fiber base material, the composite fiber base material comprises 65%-75% of alkali-free glass fibers, 15%-20% of modified polyimide fibers, 4%-6% of nanoscale carbon fibers and 8%-12% of basalt fibers, and the multi-component aerogel is loaded in the composite fiber base material. According to the multi-component aerogel, 78%-82% of tetraethoxysilane, 12%-14% of methyltrimethoxysilane, 4%-6% of dimethyldimethoxysilane and 2%-4% of vinyltrimethoxysilane serve as precursors, 1.5%-2.5% of aluminum oxide, 0.8%-1.5% of titanium oxide nanoparticles and 3%-4% of zinc borate are added, a multi-stage reinforced structure is formed, the mechanical property and flexibility of the aerogel felt are remarkably improved, the tensile strength reaches 400 kPa or above, and the tensile strength reaches 400 kPa or above. The flexibility is excellent.

The invention belongs to the technical field of building materials, and particularly relates to a building thermal insulation aerogel material and a preparation method, the aerogel material comprises the following components by mass: 25-35 parts of a silicon source, 40-80 parts of a solvent, 0.3-0.6 part of a catalyst, 4-13 parts of an aluminum source, 9-20 parts of reinforcing fibers, 4-10 parts of a modifier, and 20-40 parts of carrier fibers; the silicon source is ethyl orthosilicate or methyl trimethoxy silane; the solvent is absolute ethyl alcohol; the catalyst is hydrochloric acid or ammonia water; the aluminum source is aluminum nitrate nonahydrate or aluminum isopropoxide; the reinforced fibers are nano titanium dioxide fibers; the modifying agent is gamma-aminopropyl triethoxy silane or gamma-methacryloyloxy propyl trimethoxy silane, and the modifying agent is gamma-aminopropyl triethoxy silane or gamma-methacryloyloxy propyl trimethoxy silane; the carrier fiber is rock wool or mineral wool. According to the invention, the thermal insulation aerogel material for buildings, which is high in mechanical strength, good in weather resistance and excellent in thermal insulation performance, can be prepared, so that the requirements of the building industry on high-performance thermal insulation materials can be met.

The invention discloses a high-temperature-resistant and corrosion-resistant coating for an aluminum alloy heat exchange tube and a preparation method thereof, and relates to the technical field of coating materials. The method comprises the following steps that the aluminum alloy heat exchange tube is cleaned and deoiled, then a treating agent is sprayed, composite coating slurry is sprayed to the surface of the aluminum alloy heat exchange tube after curing, and the high-temperature-resistant and corrosion-resistant coating for the aluminum alloy heat exchange tube is obtained after curing treatment. Wherein the treating agent is prepared from NS-30 silica sol, deionized water and methyltrimethoxysilane; the composite coating slurry is prepared from a polyamide acid solution, a synergist, functionalized boron nitride nanosheets, modified hexagonal boron nitride, a flatting agent and a defoaming agent. The silane film introduced into the treating agent and the synergist, the functionalized boron nitride nanosheet and the modified hexagonal boron nitride introduced into the composite coating slurry effectively improve the high temperature resistance, the corrosion resistance, the adhesive force, the thermal conductivity, the aging resistance and the toughness of the coating. Therefore, the method has a wider application prospect.

The invention relates to the technical field of building, chemical engineering and energy heat preservation, and discloses a silicon-based aerogel composite material and a preparation method and application thereof. The invention relates to a light-emitting diode (LED) photo-curing agent, which is prepared from tetraethyl orthosilicate, methyltrimethoxysilane, allyltriethoxysilane, pentaerythritol tetra (3-mercaptopropionate), N-(3-(triethoxysilyl) propyl) furfuryl amine, N-(3-(triethoxysilyl) propyl) maleimide, a photoacid generator and a photoinitiator. The composite material has a three-dimensional porous silicon dioxide network skeleton and a polymer interpenetrating network, the three-dimensional porous silicon dioxide network skeleton is formed by copolymerization of tetraethyl orthosilicate and methyltrimethoxysilane, and the polymer interpenetrating network is formed by reaction of pentaerythritol tetra (3-mercaptopropionate) and allyltriethoxysilane. The preparation method comprises the steps of sol preparation, light curing, solvent replacement, surface hydrophobic modification and normal-pressure drying. The material shows excellent thermal insulation and mechanical properties in the fields of building heat insulation, pipeline heat preservation and cryogenic heat insulation.

The invention relates to the technical field of wind power and power grid equipment anti-icing, and discloses a fluorosilicone oil microcapsule anti-icing coating for wind power and power grid equipment. Comprising the following components which are independently subpackaged: a component A, namely a nano ceramic pre-dispersion: 20-30 parts of methyltrimethoxysilane, 5-8 parts of tetraethoxysilane, 40-60 parts of isopropanol and 10-15 parts of silicon dioxide nanoparticles with perfluoroalkyl grafted on the surfaces; the component B is microcapsule dry powder: 25-40 parts of mesoporous alumina microcapsules filled with fluorosilicone oil, 1-4 parts of amino modified carbon nanotubes and 2-5 parts of an oxygen vacancy defect type titanium dioxide photocatalyst, the microcapsules are triggered to release the fluorosilicone oil through the volume expansion rate of a thermal expansion layer and stress sensitive layer composite wall material at low temperature, and meanwhile, when ice pressure exists, the stress sensitive layer can release the fluorosilicone oil, so that the stress sensitive layer can release the fluorosilicone oil. And the polydopamine-coated aluminum oxide layer is elastically deformed to synergistically release the fluorosilicone oil to form a dual-mode anti-icing mechanism.

The invention relates to the technical field of thermal insulation materials, in particular to a high-temperature-resistant aerogel composite material and a preparation method thereof. The high-temperature-resistant aerogel composite material is prepared from the following components in parts by weight: 15 to 35 parts of reinforced fiber matrix, 43 to 65 parts of silicon-aluminum-zirconium ternary aerogel network, 3 to 12 parts of functional nano filler, 2 to 8 parts of zinc borate flame-retardant component and 0.5 to 2 parts of surface hydrophobic modified layer. Wherein the reinforced fiber matrix is composed of aluminum silicate fibers, silicon carbide fibers and aluminum oxide nanofibers; the molar ratio of silicon to aluminum to zirconium in the silicon-aluminum-zirconium ternary aerogel network is 5: 2: 1; the functional nanofiller comprises aluminum oxide nanoparticles, titanium oxide nanoparticles, carbon nanotubes and boron nitride nanosheets; the zinc borate flame-retardant component is zinc borate; the surface hydrophobic modification layer comprises an inner methyltrimethoxysilane modification layer and an outer hexamethyldisilazane modification layer. The high temperature resistance and thermal shock resistance of the material are remarkably improved, a low-energy-consumption preparation process is adopted, and the material has excellent comprehensive performance.

The invention discloses an aluminum oxide coated diaphragm and a preparation method thereof in the field of lithium ion battery diaphragms. The diaphragm comprises aluminum oxide particles, a fluorine-containing porous organosilicon compound, a phosphorus heterocyclic covalent organic framework, a binder, a dispersant and deionized water. The fluorine-containing porous organosilicon compound is prepared by mixing methyltrimethoxysilane, perfluorohexyltrimethoxysilane and water, adding ammonia water to adjust the pH value, then reacting to form a sol-gel system, adding amino silane to continue reacting, and then carrying out rotary evaporation, calcination and grinding. The phosphorus heterocycle covalent organic framework is prepared by dissolving cyanuric chloride, triphenylphosphine oxide and anhydrous tetrahydrofuran, adding imidazole bromide to react to form an intermediate, then adding ethylene glycol to continuously react, and performing vacuum drying and grinding to obtain the phosphorus heterocycle covalent organic framework. According to the diaphragm, the interface adhesion and electrolyte wettability are enhanced synergistically through the bifunctional compound, and the thermal stability and the cycle performance are improved.

The preparation method comprises the following steps: firstly, dispersing hydroxylated carbon nanotubes in water, carrying out ultrasonic treatment to form a uniform dispersion liquid, and then uniformly mixing the uniform dispersion liquid with a bacterial cellulose dispersion liquid, so as to obtain the carbon nanotube-based aerogel with the photo-thermal electric heating effect. Adding methyltrimethoxysilane sol which is hydrolyzed in advance, stirring to form a precursor system, and then performing directional freezing, freeze drying and heat treatment to obtain the carbon nanotube-based aerogel with the photo-thermoelectric heating effect. The carbon nanotube-based aerogel has the super-hydrophobic characteristic, the surface water contact angle is 161 DEG C, the surface temperature is rapidly increased to 126.7 DEG C under applied voltage, photo-thermal response is rapidly generated under simulated sunlight irradiation, the surface temperature is rapidly increased to 117.7 DEG C, and the carbon nanotube-based aerogel is suitable for rapid adsorption and separation of high-viscosity crude oil, has excellent chemical stability and mechanical stability, and can be used in the field of adsorption and separation of high-viscosity crude oil. And after the surface is broken, excellent super-hydrophobic performance and efficient photo-thermal-electric-thermal response capability are still kept.

The invention discloses a high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating and a preparation method thereof, and belongs to the technical field of organic silicon coatings. According to the invention, methyltrimethoxysilane, silica sol, hydroxyl silicone oil, isopropanol and water are used as raw materials to prepare a high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating, and a design strategy of manufacturing a nanoscale polysiloxane coating through an organic silicon precursor controllable sol-gel hydrolysis process is adopted. According to the present invention, the coating with the matrix completely composed of the in-situ generated nano SiO2 particles is prepared, the defect minimization and the highly-crosslinked Si-O-Si network structure are achieved, the nano-scale inorganic structure has long-term thermal stability, and the visible light transmittance of the coating can achieve 98% due to the inhibition of the light scattering by the sub-wavelength particle size; and tiny nano particles are uniformly and tightly arranged on the surface of the coating, so that the coating is endowed with ultrahigh hardness. In addition, the coating still maintains the inherent antifouling property of the organic silicon coating.

The invention relates to the technical field of ceramics, and particularly discloses green special refractory ceramic slurry as well as a preparation method and application thereof. The green special refractory ceramic slurry is prepared from aluminum oxide, methyltrimethoxysilane-phosphoric acid modified polysiloxane, fluorocarbon emulsion, expanded vermiculite powder, silane coupling agent modified feldspar tailing powder, a dispersing agent, an organic silicon defoaming agent, a polyurethane curing agent and deionized water. After being sintered, the green special refractory ceramic slurry provided by the invention has excellent high-temperature stability, corrosion resistance, thermal shock resistance and mechanical strength, and solves the problems of low high-temperature-resistant upper limit and poor corrosion resistance of the traditional slurry, so that the sintered ceramic adapts to severe high-temperature working conditions such as steel plant converter liners and chemical high-temperature reaction kettle inner walls; and long-term protection requirements of industrial equipment are met.

The invention belongs to the field of flame-retardant thermal insulation materials, and particularly relates to flame-retardant silicone rubber and a production process thereof. The flame-retardant silicone rubber comprises the following formula components: methyl vinyl silicone rubber, fluorinated silicone rubber, a compound flame retardant, a filler, a silane coupling agent, an antioxidant, a lubricant and a vulcanizing agent, the compound flame retardant is prepared from a carbon nano tube, nano silicon dioxide and a nitrogen-phosphorus complexing agent according to the mass ratio of (4 to 7) to (11 to 13) to (16 to 19). The preparation method comprises the following steps: reacting dimethyl phosphate with methacrylamide to obtain an intermediate, then adding trimethylolpropane, reacting to obtain a nitrogen-phosphorus complexing agent of which the molecular structure simultaneously contains a phosphate group and hydroxymethyl, and preparing nano silicon dioxide with a porous network by taking tetraethoxysilane and methyltrimethoxysilane as silicon sources. The carbon nano tube, the nano silicon dioxide and the nitrogen-phosphorus complexing agent jointly form a compound flame retardant, and the compound flame retardant is added into the flame-retardant silicone rubber, so that the heat insulation property and the flame retardance of the flame-retardant silicone rubber are effectively improved.

The invention discloses photo-thermal hydrophobic composite aerogel for crude oil adsorption and a preparation method of the photo-thermal hydrophobic composite aerogel. The composite aerogel is obtained by uniformly mixing a polyvinyl alcohol solution, a copper sulphide-loaded bacterial cellulose dispersion liquid and methyltrimethoxysilane sol, reacting and then sequentially carrying out pre-freezing treatment, freeze drying and heat treatment. The photo-thermal hydrophobic composite aerogel provided by the invention has excellent hydrophobicity and elasticity, large adsorption capacity on oily substances and excellent photo-thermal performance, can be used as an adsorbent for crude oil recovery, can be repeatedly utilized, and has practical popularization and application values.

The invention discloses a preparation method of an antibacterial warm-keeping fabric, and relates to the technical field of textiles. When the antibacterial warm-keeping fabric is prepared, firstly, (E)-butyl-2-ene-1, 4-diamine, glyoxal, formaldehyde and butyric acid are used as raw materials to synthesize a polyimidazolium salt antibacterial agent, then the polyimidazolium salt antibacterial agent is copolymerized with polytetrahydrofuran ether glycol and diphenylmethane diisocyanate to prepare an antibacterial polyurethane spinning solution, and the antibacterial fabric is obtained through wet spinning and weaving. The preparation method comprises the following steps: reacting L-cysteine with 3-amino propyl triethoxy silane to prepare cysteamine acyl propyl triethoxy silane, reacting with formaldehyde and phosphorous acid to obtain flame-retardant modified silane, and further preparing a silicon dioxide solution from the flame-retardant modified silane and sol-gel such as methyltrimethoxysilane; finally, the antibacterial fabric is treated with a benzophenone solution and then soaked with a silicon dioxide solution, and the antibacterial thermal fabric is prepared through ultraviolet irradiation, standing gelation, aging and hexane washing. The prepared fabric has excellent antibacterial property, heat retention property and flame retardant property.

The invention relates to a high-salt-tolerance asymmetric solar interface evaporator and a preparation method. Nano-crystalline cellulose with low thermal conductivity is used as a base material, carbon black with good photothermal conversion performance is used as a photothermal layer, methyltrimethoxysilane is used as a hydrophobic modifier, and the high-salt-tolerance asymmetric solar interface evaporator with a vertical pore channel structure is constructed through a directional freezing technology. The evaporator is composed of a cellulose hydrophilic lower layer and a carbon black hydrophobic upper layer, water can be rapidly transported to an evaporation interface through the capillary action of cellulose, the carbon black hydrophobic upper layer can improve the light absorption capacity and the heat positioning capacity of the evaporator, and continuous and efficient water evaporation is achieved. Cellulose cation modification and an asymmetric structure can reduce the generation of salt crystals, can significantly improve the salt resistance of the evaporator, has a good application prospect in the field of solar seawater desalination, and has wide practical application potential due to easy preparation, enlargement and low cost.

The present application belongs to the technical field of silica sol preparation, and particularly relates to a silica sol preparation method using ion exchange method. In the prior art, the silica sol growth time is shortened by optimizing the preparation and impurity removal process, and the silica sol seed mother liquor is prepared under ultrasonic assistance. The organic alkali catalyst maintains the silica sol growth pH and the metal ions in the complex solution, so that the impurities are reduced during the silica sol growth. After the introduction of dodecyltrimethoxysilane, hexadecyltrimethoxysilane and methyltrimethoxysilane as the hydrophobic group surface modification, the impurity metal ions are filtered through the complexing agent and the ammonium type resin. The three ethylene tetramine ethanol solution modifies the ammonium type resin, enhances the selective adsorption of the resin to the metal ions, and the maleic anhydride crosslinking agent and nano silicon dioxide modify the ammonium type resin, increase the service life of the ammonium type resin. The prepared silica sol has high purity, good mechanical properties and dispersibility, and excellent hydrophobic performance.

A method for preparing methyl silicone resin for high-temperature mica boards includes: (1) Solution A is a mixture of methyltrimethoxysilane, dimethyldimethoxysilane, and epoxysilane coupling agent, which account for 87%-95%, 3%-7%, and 2%-6% of the total amount of A, respectively; (2) Adding 0.5-1.0 times the amount of benzene solvent, 0.2-0.3 times the amount of isopropanol, and adding 0.5%-1% of the total amount of A acidic catalyst to obtain solution B; (3) Heating B to 70℃-80℃, and uniformly adding deionized water, and adding... The time is controlled at 2-3 hours. After the addition is completed, continue stirring for half an hour to obtain solution C. The amount of deionized water is 40%-50% of the total amount of A. (4) Transfer C to a separatory funnel and let it stand to separate into layers. The lower layer of methanol solution is purified by distillation, and the upper layer of silanol solution is washed with water until neutral to obtain solution D. (5) Heat D and reflux for condensation reaction. Maintain the temperature at 130℃-140℃ for half an hour, then cool to room temperature and add benzene solvent to form a 50%-60% concentration of methyl silicone resin for high-temperature mica boards. The benzene solvent content is 40%-50%. It is environmentally friendly, has a simple process, excellent bending resistance, and good moisture resistance.

The invention relates to a preparation method of a hydrolysis modified organic silicon high-temperature-resistant anticorrosive coating, and belongs to the technical field of anticorrosive coatings. The preparation method comprises the following steps: heating 1, 1 '-bis (dimethylsilyl) ferrocene, methylbenzene, chloroplatinic acid, 2, 2, 3, 3, 4, 4, 4-heptafluorobutyl acrylate and bis-(2-methylallyl) cyclooctyl-1, 5-diene ruthenium, and reacting to obtain an intermediate product 1; weighing methyltrimethoxysilane, phenyltrimethoxysilane and the intermediate product 1, uniformly stirring and mixing, slowly dropwise adding diluted hydrochloric acid, hydrolyzing, and heating to react, so as to obtain modified silicon resin; adding the modified silicon resin into petroleum ether, and adding silicone oil, an organic tin catalyst, a bis-ammonia coupling agent, filler and a curing agent to obtain the anticorrosive paint.

The invention discloses a method for preparing silicon dioxide aerogel powder from building solid waste micro-powder and silicon dioxide aerogel powder.The method comprises the steps that calcium removal and aluminum removal pretreatment is conducted on the building solid waste micro-powder, and a pretreatment filter cake is obtained; the content of SiO2 in the pretreated filter cake is more than 85%, the content of CaO is less than 1.5%, and the content of Al2O3 is less than 3% by mass; mixing the pretreated filter cake with alkali liquor, and carrying out hydrothermal synthesis reaction to obtain first sol; sequentially carrying out flash evaporation concentration and modulus adjustment on the first sol to obtain modulus-adjusted water glass; mixing the water glass with ethanol and methyltrimethoxysilane, adding a catalyst, carrying out dispersion treatment to obtain second sol, carrying out injection molding gelation on the second sol, and carrying out aging treatment to obtain aged gel; and carrying out hydrophobic modification, crushing, multi-stage gradient drying and screening on the aged gel to obtain the silicon dioxide aerogel powder. The problem of difficulty in resource utilization of the solid waste micro powder is solved.

The invention discloses organic silicon modified wood lacquer and a preparation method thereof, and relates to the technical field of coatings. The invention discloses organic silicon modified wood lacquer. The water-based silicone sealant is prepared from the following raw materials in parts by weight: 20 to 35 parts of hydroxyl-terminated polydimethylsiloxane, 8 to 15 parts of methyltrimethoxysilane, 12 to 20 parts of bio-based polyol, 6 to 12 parts of isophorone diisocyanate, 3 to 8 parts of modified nano titanium dioxide, 5 to 10 parts of polyvinylidene fluoride, 4 to 9 parts of modified organosilicone elastomer, 0.2 to 0.8 part of dibutyltin dilaurate and 1 to 3 parts of ammonium polyacrylate. 0.5 to 1.5 parts of polyether modified polysiloxane, 2 to 6 parts of alcohol ester-12 and 15 to 30 parts of deionized water. According to the organic silicon modified wood lacquer, hydroxyl-terminated polydimethylsiloxane serves as a matrix, cross-linking is conducted through methyl trimethoxy silane, toughening is conducted through bio-based polyhydric alcohol, an interpenetrating network structure is formed in cooperation with multiple layers of modified nano titanium dioxide and the organic silicon elastomer, the organic silicon modified wood lacquer has high cross-linking density and flexibility, a coating is compact, and weather resistance is high.

The application provides an in-situ oriented carbon nanotube / silicon nitride nanobelt composite material and a preparation method thereof, and comprises the following steps: uniformly mixing methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, water and nitric acid according to a certain proportion, and obtaining a siloxane xerogel precursor after stirring and drying; obtaining a silicon nitride nanomaterial by a carbothermal reduction reaction method under high-temperature conditions; injecting a mixed solution of ethanol, ethylenediamine and ferrocene into a tube furnace by a floating CVD method under high-temperature conditions, and growing carbon nanotubes on the surface of the silicon nitride nanobelt to obtain the in-situ oriented carbon nanotube / silicon nitride nanobelt composite material; and the application grows the carbon nanotubes on the surface of the silicon nitride nanobelt material by the floating CVD method to improve the electromagnetic shielding performance of the silicon nitride nanocomposite material, and finally, the carbon nanotube / silicon nitride nanobelt composite material with light weight, flexibility and good electromagnetic shielding performance is prepared.

The invention relates to the technical field of sealants, and particularly discloses a dealcoholization type organic silicon sealant and a preparation method thereof.The dealcoholization type organic silicon sealant is prepared from, by weight, 20-60 parts of methoxy-terminated 107 glue with the viscosity being 20000-80000 mPa.s, 0.5-20 parts of methoxy-terminated 107 glue with the viscosity being 1000-5000 mPa.s, 0.2 part of black paste and 2-10 parts of methyltrimethoxysilane, and the dealcoholization type organic silicon sealant is prepared from, by weight, 20-60 parts of methoxy-terminated 107 glue with the viscosity being 20000-80000 mPa.s, 0.5-20 parts of methoxy-terminated 107 glue with the viscosity being 1000-5000 mPa.s, 0.2 part of black paste and 2-10 parts of methyltrimethoxysilane. The sealant comprises the following components in parts by weight: 10-40 parts of nano calcium carbonate, 0.2-5 parts of a simple coupling agent, 1-7 parts of a complex coupling agent, 0.2-2 parts of chelated titanate and 0.01-0.15 part of an organic tin catalyst, and the sealant provided by the invention can be physically and chemically bonded with hydroxyl of an aluminum oxide thin layer of a micro-interface on the surface of an aluminum alloy, so that the bonding force of an oil stain interface is effectively enhanced.

The utility model discloses a desalting device for production of methyltrimethoxysilane, which comprises a base, vertical plates fixedly connected to the left end and the right end of the upper surface of the base, a temporary storage box arranged between the two vertical plates, two mounting discs fixedly connected to the surface of the temporary storage box, and the two mounting discs are oppositely distributed up and down. A plurality of automatic telescopic rods are fixedly connected to the upper surface of the base, limiting assemblies are arranged at the upper ends of the automatic telescopic rods and the lower surface of the lower mounting disc, a built-in box is fixedly connected to the interior of the temporary storage box, two liquid guide pipes are fixedly connected to the lower surface of the temporary storage box, and long plates are arranged in the built-in box and the temporary storage box correspondingly; the surfaces of the long plates are fixedly connected with a plurality of ion exchange resin storage boxes, and the faces, away from the ion exchange resin storage boxes, of the two long plates make close contact with the front inner wall of the temporary storage box and the rear inner wall of the built-in box correspondingly. Through the structure, the occupied area of the desalting device is reduced, and the convenience of replacing articles in the device is improved.

The invention discloses an ammonia colorimetric sensor for detecting meat freshness. According to the sensor, cellulose aerogel is used as a sensing base material, the natural pigment hematoxylin is used as an indicator, and the natural pigment loaded bio-based ammonia colorimetric sensor is constructed by utilizing the characteristics of high porosity and large specific surface area of the cellulose aerogel and the characteristic that the hematoxylin is sensitive to the change of a pH value. And when the freshness of meat is reduced, ammonia gas and other substances can be released, so that the pH value of the environment is changed, and the color of the hematoxylin is changed, so that the putrefaction degree of food can be intuitively reflected. In order to improve the practicability of the sensor in a complex environment, methyl trimethoxy silane is used for carrying out hydrophobic modification treatment on the surface of the cellulose aerogel, and the treatment can effectively inhibit the interference of moisture on the cellulose aerogel. The invention provides a convenient, sensitive, rapid and efficient solution for detecting the freshness of the food.

This invention relates to a silicone rubber adhesive and its preparation method, belonging to the technical field of silicone rubber adhesives. The silicone rubber adhesive comprises the following components: 100 parts of hydroxyl-terminated polydimethylsiloxane and nano-calcium carbonate, of which 40 to 60 parts are nano-calcium carbonate; 2 to 3 parts of methyltrimethoxysilane; 1 to 2 parts of diisopropyl bis(ethyl acetoacetate) titanate; and 0.3 to 0.7 parts of a tackifier. The tackifier comprises compounds with the general structural formula shown in Formula I or Formula II. Compared with existing silicone rubber adhesives, the silicone rubber adhesive provided by this invention contains a tackifier with a specific structure, which can significantly improve the construction speed, meet the needs of rapid construction, and make up for the shortcomings of existing silicone rubber adhesives.

The invention discloses a SiOC aerogel-molecular sieve composite material with a coating structure for protecting a methane gas sensor and a preparation method of the SiOC aerogel-molecular sieve composite material, the SiOC aerogel-molecular sieve composite material adopts a structural design of coating a molecular sieve with SiOC aerogel, and the inner core structure adopts a molecular sieve with micron-scale granularity and nano-scale internal pores; and the SiOC aerogel coated outside is prepared by adopting methyl trimethoxy silane and vinyl triethoxy silane as silicon sources and adopting a sol-gel method. On one hand, defects caused in the preparation process of the aerogel can be reduced as much as possible, on the other hand, interface contact between the aerogel and the molecular sieve can be effectively ensured, the specific surface area and the micropore porosity of the aerogel are further improved while the structural stability of the aerogel is ensured, and the preparation method is simple and convenient. Therefore, the SiOC aerogel and molecular sieve composite material has better gas adsorption and filtration capacity and can be stably applied to a methane gas sensor protection material.

The invention relates to the field of functional coatings for traffic facilities, in particular to a long-acting light-storing and light-emitting coating as well as a preparation method and application thereof. According to the long-acting light-storing and light-emitting coating provided by the invention, the light-storing and light-emitting coating adopts the function collaborative design of the light-storing bottom coating, the light-emitting enhancing middle coating and the anti-fouling and weather-proof transparent surface coating, and has the advantages of efficient light absorption, long-acting light emitting, anti-fouling and anti-aging. The two light-storing and light-emitting materials AH-805W and AH-812W in the coating are compounded, and when excitation is stopped for 10 min, the luminance is larger than or equal to 300 mcd / m < 2 >. Due to the particle size gradient distribution design of the floating coating, the light storage and luminous efficiency is effectively improved, and the problem of insufficient afterglow brightness of a single-layer coating is solved. And the transparent finishing coat layer adopts an organic silicon methyl trimethoxy silane antifouling technology, so that the self-cleaning capability of the coating is remarkably improved, and the coating is suitable for an outdoor traffic environment. The long-acting light-storing and light-emitting coating can store light in the daytime and does not need power supply at night, and 40%-50% of the illumination energy-saving effect of traffic facilities is achieved.

The present invention provides a friction-reducing liquid crystal screen optical film and a preparation method thereof, relating to the technical field of optical films. The preparation method comprises the following steps: dissolving polyethylene glycol and silane in toluene, adding dibutyltin dilaurate, vacuumizing and extracting the toluene solvent after refluxing, and the remainder being polyethylene glycol containing terminal alkoxysilane; adding methyltrimethoxysilane, dimethyldimethoxysilane, aminosilane, fluorosilane, and polyethylene glycol containing terminal alkoxysilane to a mixed solvent of ethanol and isopropanol; adding hydrochloric acid solution and glacial acetic acid to the solution, stirring and aging to obtain a sol-gel solution; coating the sol-gel on the optical film, and drying to obtain the friction-reducing liquid crystal screen optical film. The present invention has the beneficial effects of effectively reducing the electrostatic effect generated during the friction process and improving the friction-reducing performance of the liquid crystal screen optical film on the lower polarizer.

The application provides a combined silicon nitride ceramic antenna dome and a preparation method thereof, and belongs to the technical field of silicon nitride ceramic antenna dome; the preparation method of the antenna dome main dome body comprises preparation of a primary dome body and surface sealing; the preparation of the primary dome body comprises preparation of titanium sol, preparation of a blank and sintering; in the preparation of the blank, silicon powder, aluminum nitride powder, a sintering aid and sodium dodecylbenzenesulfonate are mixed, and after uniform stirring, polymethyl methacrylate and polyethylene glycol 2000 are added to obtain a mixture; the mixture is added to the titanium sol, stirred at 900-1200 rpm for 30-40 min under a nitrogen atmosphere, then ball milled for 1.8-2.2 h, methyltrimethoxysilane solution is added, and the ball milling is continued for 26-35 min, then the mixture is placed in a mold and left to stand, and the blank is obtained after drying; the antenna dome prepared by the application has low density, high strength and hardness, high toughness, low thermal conductivity and dielectric constant, and excellent rain erosion resistance.

The application provides a high-toughness methyl silicone resin and a preparation method thereof. The high-toughness methyl silicone resin comprises the following raw materials in parts by mass: 100 parts of methyltrimethoxysilane; 18-24 parts of dimethyldimethoxysilane; 10-12 parts of a polyhydroxy steric-modified agent; 20-26 parts of water; 36-44 parts of an organic solvent; 0.1-0.3 parts of a titanate catalyst; and 0.1-0.3 parts of an organic tin catalyst. The polyhydroxy steric-modified agent is a topological structure compound containing at least two active hydroxyl groups, which is prepared by an addition reaction of a multifunctional aliphatic polyol and an unsaturated bridged cyclic alicyclic compound under the catalysis of a Lewis acid, and the active hydroxyl group content of the topological structure compound is 3.5-4 mmol / g. The high-toughness methyl silicone resin is applied in the preparation of a flexible sealing material or a heat-resistant coating material for a heating pipe.