128 results about "Siloxide" patented technology

The present invention relates to the technical field of coatings and discloses a method for preparing an EVA waterproof coating. Activated montmorillonite reacts with toluene diisocyanate to obtain isocyanate-modified montmorillonite. EVA is hydrolyzed under the catalysis of potassium hydroxide to obtain hydroxylated EVA. An epoxy trisiloxane intermediate reacts with terephthalic acid under ring-opening esterification with benzyltriethylammonium chloride to obtain p-hydroxytrisiloxane benzoate. P-hydroxytrisiloxane benzoate, hydroxylated EVA, and isocyanate-modified montmorillonite are cross-linked with toluene diisocyanate under the catalysis of stannous octoate, and a defoamer and a dispersant are added thereto and stirred uniformly to obtain an EVA waterproof coating. The EVA waterproof coating prepared by the present invention has good mechanical properties and waterproof properties.

The present invention relates to a method for simultaneously achieving a superhydrophobic and superoleophobic surface on 5,000 series aluminum alloy in an anodic oxidation process without a pre-patterning step, wherein the uniform anodic oxide film can be produced even without a pre-patterning step, thus making it possible to reduce manufacturing costs, the anodic oxide film can be imparted with superhydrophobicity and superoleophobicity according to a coating composition in which a cross-linked PDMS derivative represented by chemical formula 1 and an organic solvent are used in a specific mixing ratio, the coating composition has a low manufacturing cost and the coating film thickness can be adjusted to several to several tens of nm, thus enabling application to the coating of a microstructured oxide film, and the method can be useful for creating a machine learning database for developing 5,000 series aluminum alloy surface treatment technology.

The invention discloses an epoxy organic silicon tackifier as well as a preparation method and application thereof, and relates to the technical field of tackifiers. The preparation method of the epoxy organic silicon tackifier comprises the following steps: filling an ultra-microporous Pt / SiO2 catalyst into a reactor, and heating to activate the ultra-microporous Pt / SiO2 catalyst; the preparation method comprises the following steps: mixing tetramethylcyclotetrasiloxane, allyl glycidyl ether and 3-methacryloxypropylmethyldimethoxysilane to obtain a mixed reaction raw material, heating the mixed reaction raw material until the temperature reaches 70-100 DEG C, adding the mixed reaction raw material into a reactor, reacting to generate a synthetic product, and collecting the synthetic product flowing out of the bottom of the reactor, the epoxy group organic silicon tackifier is obtained. According to the preparation method of the epoxy organic silicon tackifier, a solvent does not need to be added in the reaction process, potential safety hazards are avoided, the step of removing the solvent and the catalyst can be omitted, the technological process is simplified, and continuous production of the tackifier can be achieved by adopting the method of the scheme.

The invention relates to a preparation method and application of trifluoropropyl methyl cyclotrisiloxane (D3F), and the method comprises the following steps: hydrolyzing trifluoropropyl methyl dichlorosilane to prepare a hydrolysate containing D3F, and then separating and purifying through distillation to obtain a high-purity D3F product. And the D3F yield is improved by optimizing hydrolysis conditions including reaction temperature, reaction time, reaction media, the feeding ratio of a substrate to the media and the like. According to the method, D3F is directionally prepared through one-step reaction, hydrochloric acid, an organic solvent and other catalysts do not need to be additionally added into a reaction system, further catalytic cracking is not needed, and the method has the advantages of being easy and convenient to operate, high in efficiency, green in reaction condition, high in product purity and the like.

The invention belongs to the technical field of sealants, and particularly relates to a dealcoholized organosilicon sealant as well as a preparation method and application thereof. The organic silicon sealant is prepared from alpha, omega dihydroxy polydimethylsiloxane, a flame retardant, a cross-linking agent, a coupling agent and a catalyst, the flame retardant comprises aluminum hydroxide, aluminum hypophosphite and silica powder; the coupling agent is prepared from gamma-aminopropyl triethoxy silane, gamma-(2, 3-epoxypropoxy) propyl trimethoxy silane and bis-(gamma-trimethoxy silylpropyl) amine; the cross-linking agent is prepared from methyl trimethoxy silane, methyl vinyl dimethoxy silane and methyl triethoxy silane; the catalyst comprises ethyl acetoacetate and diisobutyl titanate. The flame retardant, the coupling agent and the cross-linking agent are compounded by adopting specific substances, meanwhile, specific types of catalysts are adopted, and all the components have a synergistic effect, so that the organic silicon sealant has good flame retardant property, mechanical property and adhesive property at the same time and is not prone to yellowing.

The present invention relates to the field of catalyst technology, and specifically to a ruthenium-based catalyst with high thermal stability, a preparation method and application thereof. (1) A ruthenium salt, a polyol and a surface protective agent are mixed and reacted to obtain a ruthenium nanoparticle colloid, wherein the polyol includes one of ethylene glycol, propylene glycol and isopropanol, and the surface protective agent includes one of trimethylsiloxane, aminosilane and dimethylpolysiloxane; (2) The ruthenium nanoparticle colloid described in step (1) is mixed with a rare earth oxide, and the ruthenium nanoparticles are loaded onto the rare earth oxide by a colloidal precipitation method to obtain a catalyst precursor; (3) The catalyst precursor is calcined to obtain the ruthenium-based catalyst. The ruthenium-based catalyst prepared by the present invention is applied to an ammonia decomposition reaction, and the reaction temperature is 500°C and 20,000 h. ‑1 Under the space velocity conditions, the catalyst reaction conversion rate can reach 99.5%, and the catalyst reaction activity remains basically unchanged when maintained at 500°C for 20,000 hours.

The invention discloses an efficient metal cleaning agent and a preparation method thereof, and belongs to the technical field of chemical cleaning agents, and the efficient metal cleaning agent comprises the following components in parts by weight: 10-18 parts of builder, 4-15 parts of surfactant, 0.2-0.8 part of solubilizer, 1-1.5 parts of corrosion inhibitor, 0.2-0.5 part of antirust agent, 1-2 parts of complexing agent, 0.2-0.8 part of preservative, 0.5-1.5 parts of potassium alkylolamide phosphate and 0.5-1 part of defoaming agent. And the balance of deionized water. According to the surface active agent, N-(2-aminoethyl)-3-aminopropyl tetrasiloxane, D-(+)-gluconic acid delta-lactone, epoxy chloropropane, glycerol and the like are used as raw materials, and the obtained metal cleaning agent has good defoaming capacity and deoiling cleaning capacity, meets the requirements in metal cleaning and is high in practicability.

There is provided a biological specimen separation instrument with which a biological specimen can be stably separated into a predetermined component. The biological specimen separation instrument includes an accommodation instrument (1) for accommodating a collected biological specimen, a filter (128) for filtering a predetermined component in the collected biological specimen, and a holding instrument (100) for accommodating the predetermined component filtered by the filter (128), where the holding instrument (100) is configured to be inserted into the accommodation instrument (1), in which the filter (128) is provided on a tip side of the holding instrument (100) in a direction of insertion into the accommodation instrument (1), a sealing member (130) is provided in an outer circumference on the tip side of the holding instrument (100) in the direction of insertion to allow movement in the accommodation instrument (1), in a state of being liquid-tightly brought into contact with an interior wall of the accommodation instrument (1), and the sealing member (130) has a Shore A hardness of 20 or more and 90 or less and has a residual siloxane concentration of 1 wt % or less.

The invention relates to a preparation method of a gallium ion-doped lithium lanthanum zirconium oxide solid electrolyte, and belongs to the field of solid electrolytes. The preparation method comprises the following steps: adding lithium carbonate, lanthanum oxide, zirconium oxide, gallium oxide, a Ga < 3 + >-hydrogen-based silsesquioxane chelating auxiliary agent and ethanol into a ball milling tank for ball milling, drying, and then putting into a muffle furnace for pre-sintering to obtain pre-sintered powder; putting the pre-sintered powder into the ball milling tank again for ball milling, and tabletting to obtain a green body; and placing the green body in a sintering furnace, and carrying out high-temperature sintering in an oxygen atmosphere to obtain the gallium ion-doped lithium lanthanum zirconium oxide solid electrolyte, the Ga < 3 + >-hydrogen-based silsesquioxane chelating auxiliary agent is prepared from gallium fluoride, lithium carbonate, hydrogen-based silsesquioxane, citric acid and deionized water; by doping gallium ions, the ionic conductivity can be remarkably improved; and after the lithium lanthanum zirconium oxide is placed in an air atmosphere for 30 days, the retention rate of ionic conductivity is greater than 97%, and the problem of poor stability of lithium lanthanum zirconium oxide is solved.

The present invention provides a dealcoholized silicone sealant with rapid initial curing and a preparation method thereof, comprising the following steps: dispersing a metal-organic framework (MIL-101), a silane coupling agent, and calcium carbonate in an organic solvent and reacting for 5 to 7 hours to obtain MIL-101@CaCO3; and mixing and dispersing α,ω-dihydroxy polydimethylsiloxane, alkoxy-terminated polydimethylsiloxane, MIL-101@CaCO3, a crosslinking agent, a coupling agent, and a catalyst to obtain the dealcoholized silicone sealant. The present invention significantly increases the migration rate of water vapor within the filler by modifying CaCO3 with the metal-organic framework (MIL-101). The diffusion coefficient of water vapor within the filler is 0.112 cm at 25°C and 30% relative humidity. 2 / s, and ensure the mechanical strength; on this basis, it is combined with alkoxy-terminated polydimethylsiloxane to further improve the curing rate, and the curing depth can reach more than 1mm in 6 hours.

The invention discloses snowflake cream with pearly luster and a preparation process of the snowflake cream. The snowflake cream comprises the following raw material components: a phase A: water; butanediol; glycerol; methyl glucitol polyether-20; a polyacrylate cross-linked polymer-6; sodium hyaluronate; potassium hydroxide (90%); 4-hydroxyacetophenone; xanthan gum; phase B: caprylic / capric triglyceride; cetostearyl alcohol; stearic acid; a polydimethylsiloxane; squalane; simmondsia chinensis seed oil; mineral oil; and polyethylene glycol (PEG)-100 stearate. Glyceryl stearate; tocopheryl acetate; isononyl isononanoate; a phase C: 1, 2-hexanediol; carnosine; a centella asiatica extract; collagen; the snowflake cream has the advantages of uniform pearly luster texture and the advantages of traditional snowflake cream.

The invention discloses a preparation method of a cresol trozole trisiloxane intermediate, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: by taking 2, 6-dibromo-4-methylphenol as a raw material, reacting with 3, 4-dihydropyran under the action of p-toluenesulfonic acid, so as to generate an intermediate 2-(2, 6-dibromo-4-methylphenoxy) pyran; reacting with sodium methoxide under the action of a catalyst to generate an intermediate 2-(2-bromo-4-methyl-6-methoxyphenoxy) pyran; then generating a Grignard reagent, carrying out coupling reaction on the Grignard reagent and 3-bromine-2-methallyl, finally reacting with benzotriazole lithium salt, and carrying out acidolysis deprotection to obtain the cresol trozole trisiloxane intermediate. The raw materials are available in the market, the overall yield is high, and a route reference is provided for synthesis of the compounds.

There has been a problem of low bonding strength in conventional insulating layers, i.e., SiO2. In addition, there is a problem of poor conduction of the electrode or a decrease in reliability of the obtained laminate due to a void generated when a minute foreign matter is sandwiched in the bonding interface. The invention provides a laminated body. A-1 in at least a portion of a first substrate including an exposed (A-1) metal electrode and an exposed (B-1) resin layer on the same surface of a substrate main body, and a second substrate including an exposed (A-2) metal electrode and an exposed (B-2) resin layer, or an exposed (A-2) metal electrode and an exposed (C) inorganic insulating layer on the same surface of the substrate main body the metal electrode and the (A-2) metal electrode and at least a portion of the (B-1) resin layer and the (B-2) resin layer, or at least a portion of the (A-1) metal electrode and the (A-2) metal electrode and at least a portion of the (B-1) resin layer and (C) an inorganic insulating layer are bonded together directly, respectively; at least one of the (B-1) resin layer and the (B-2) resin layer contains one or more resins selected from the group consisting of a carbonyl group, a hydroxyl group, an alkylene oxide group, a group having a siloxane bond, and a nitrogen-containing heterocyclic ring.

The application discloses a supported chiral phosphine heterogeneous catalyst and a preparation method and application thereof, and relates to the technical field of heterogeneous catalyst preparation. The method comprises the following steps: mixing hollow mesoporous polystyrene nanospheres, chiral phosphine and DCE, stirring, adding FDA, stirring, adding concentrated sulfuric acid dropwise, and reacting to obtain a reactant one; and mixing the reactant one, toluene, tetramethyldisiloxane and tetraisopropyl titanate, and reacting under temperature rise to obtain the supported chiral phosphine heterogeneous catalyst. The application is simple and convenient in a one-pot method, and can efficiently anchor the chiral phosphine and its oxide catalyst to the carrier. The application solves the problems of complicated modification in the existing organic catalyst immobilization process and mass transfer limitation of the prepared catalyst.

The invention relates to the technical field of organic silicon materials, in particular to a synthesis method of high-purity methylsiloxane. Comprising the following steps: mixing a methyl chlorosilane monomer with deionized water according to a molar ratio of 1: (3-5), adding a metal oxide catalyst, and carrying out a hydrolysis reaction under the protection of inert gas; controlling the temperature by stages after the hydrolysis reaction: stirring and reacting for 1-2 hours at 60-80 DEG C in the first stage, heating to 90-110 DEG C and reducing the pressure to 0.05-0.1 MPa in the second stage, and continuously reacting for 0.5-1 hour; and after the reaction is finished, purifying through reduced pressure distillation, molecular sieve adsorption and membrane filtration in sequence to obtain the methylsiloxane with the purity of more than or equal to 99.8%. The invention provides a synthetic method with high-efficiency catalysis, precise temperature control and deep purification, so that the bottleneck of the prior art is broken through, and the purity of methylsiloxane is greatly improved.

The application relates to the technical field of fine chemical synthesis, and discloses a PDI catalyst for preparing cresol trisiloxane, a preparation method and a preparation method of cresol trisiloxane. Me PDI)FeBr2, sodium and nai are dissolved in an ultradry solvent, and the reaction is stirred under a nitrogen atmosphere; the reaction product is post-treated to obtain a PDI catalyst; 2-(2'-hydroxy-3'-methylethenyl-5'-methylphenyl) benzotriazole and the PDI catalyst are dissolved in an organic solvent, the temperature is increased to 50-60 DEG C, bistrimethylsiloxy methylsilane is added dropwise, and the reaction is preserved for 6-10 h; the organic solvent is removed by concentration under reduced pressure, and crystallization is carried out to obtain cresol trisiloxane. The iron complex catalyst is used to replace the traditional platinum catalyst, the material cost is reduced, the risk of heavy metal residue can be avoided, a small amount of the iron complex catalyst can be used, and higher catalytic activity and selectivity can be realized.

The application provides a method for preparing methyl phenyl silicone oil by one-pot method, comprising: S100, carrying out hydrolysis reaction of phenyl dialkoxysilane selected from methyl phenyl dimethoxysilane and diphenyl dimethoxysilane and a chain extender selected from dimethyl cyclosiloxane and alpha, omega-dihydroxypolydimethylsiloxane in the presence of water and a first catalyst at a temperature of 40-90 DEG C, and carrying out first low boiling point removal treatment; S200, adding a second catalyst and reacting at 70-160 DEG C; S300, carrying out second low boiling point removal treatment to obtain methyl phenyl silicone oil; wherein the first catalyst and the second catalyst are each independently selected from tetramethyl ammonium hydroxide silanol salt and potassium hydroxide silanol salt; and the method further comprises: adding an end-capping agent before the hydrolysis reaction in step S100 or before adding the second catalyst in step S200.

This invention discloses a synthetic process for an empagliflozin intermediate, belonging to the technical field of pharmaceutical intermediate synthesis. The synthetic process is as follows: 2-chloro-5-bromobenzoic acid is first mixed with dichloromethane and N,N-dimethylformamide, and thionyl chloride is added dropwise to obtain a dichloromethane solution of acyl chloride. Then, it is reacted with fluorobenzene under anhydrous aluminum trichloride catalysis to obtain intermediate EGAB-3. Then, it is dehydrated by azeotropic reaction with potassium hydroxide aqueous solution in toluene, and then refluxed with 3-hydroxytetrahydrofuran under tetrabutylammonium bromide catalysis to obtain intermediate EGAB-7. Then, it is reacted with 1,1,3,3-tetramethyldisiloxane under anhydrous aluminum trichloride and nitrogen protection, dried, and tested to be qualified to obtain empagliflozin intermediate. This process achieves high purity, high yield, and low isomer impurities in the preparation of empagliflozin intermediate.

The application relates to a deburring method for a micro-aperture cross-hole of a semiconductor equipment precision component. The method comprises the following steps: deburring liquid: uniformly mixing cage polysilsesquioxane-octakis-epoxy nano silicon dioxide dispersion, phenylboronic acid, octakis octyl cage polysilsesquioxane, an activated dispersant and a first solvent to obtain a first mixed liquid; dissolving an organic acid in a second solvent to obtain a second mixed liquid, adding the second mixed liquid into the first mixed liquid, adjusting the PH value to 3-5 to obtain an environment-friendly deburring liquid; capillary removal: removing the burrs inside the hole of the semiconductor equipment precision component by using the heated deburring liquid, and then performing flushing to obtain the precision component with the removed burrs and the recycled deburring liquid. The above scheme realizes the triple effects of "grinding-dissolving-protection", improves the burr removal effect of the micro-aperture cross-hole of the semiconductor equipment precision component, and can maintain good removal effect for long-term repeated use and heating.

The present invention provides a method for preparing a new type of semiconductor single-walled carbon tube catalyst, which utilizes the unique molecular structure of silsesquioxane to graft multiple reactive groups or metal atoms, improves the compatibility of different phases, increases the regularity and controllability of the molecular structure, and the end group contains multiple active reaction sites, connects multiple active reaction sites, and combines more active metals, which greatly improves the yield of carbon nanotubes. By controlling the proportion of metals in the active components of the catalyst, the diameter of the single-walled carbon nanotube is controlled, and the size-controlled production of single-walled carbon nanotubes is achieved. The catalyst preparation process in this method is controllable and easy to implement, the raw material source is wide, the price is low, the later single-walled carbon tube processing and instrument maintenance are simpler, and the mass production of single-walled carbon nanotubes can be achieved.

The invention relates to a polishing solution, a preparation method thereof and an aluminum alloy polishing method. The polishing solution comprises a lubricant, a corrosion inhibitor, an antirust agent and a solvent; wherein the lubricant comprises at least one of the following characteristics: (1) the lubricant comprises oleic acid diethanolamine molybdic acid; (2) the lubricant comprises an organic lubricant and an inorganic lubricant, the inorganic lubricant comprises inorganic molybdenum salt, and the organic lubricant comprises at least one of coconut oil diethanolamide, polyol ester and ricinoleate; the corrosion inhibitor comprises one of the following characteristics: (1) isomeric alcohol phosphate; and (2) at least one of phosphate ester, siloxane ketone, cyclocarboxypropyl oleic acid and polyoxyethylene oleate, and an anionic surfactant. The polishing solution can effectively prevent the phenomenon of poor brightness or burnishing caused by drying of a lubricating film due to friction heat in the polishing process, effectively reduces pinhole-shaped corrosion pits, and can effectively improve the polishing brightness at the same time.

This invention discloses a method for preparing a 3D-printed impact-resistant elastic conductor material. Silver particles / silver nanosheets are used as the conductive phase, and polyboron dimethylsiloxane (PBMS) is used as the impact-resistant material. The addition of a polyhydroxyl-based low-boiling-point solvent reversibly adjusts the density of the dynamic B-O crosslinking bonds within PBMS and reversibly increases the number of silanol groups, thereby increasing the hydrogen bond density and enhancing the printability of PBS without affecting its shock-absorbing effect. This invention utilizes the reversible reaction principle between the polyhydroxyl-based low-boiling-point solvent and the dynamic B-O crosslinking bonds to control the decrease and recovery of B-O density. Simultaneously, due to the percolation effect of silver powder particles / silver sheets, the Ag / PBS impact-resistant elastic conductor exhibits excellent conductivity. After vacuum drying of the polyhydroxyl-based low-boiling-point solvent in the printed pattern, the density of the dynamic B-O crosslinking bonds is restored, and the Ag / PBS impact-resistant elastic conductor regains its good shear thickening effect, conductivity, sensing performance, and self-healing properties.

The invention relates to a clean production process for co-producing diacetylmonoxime and acetaldehyde oxime. The method comprises the following steps: adding a modified catalyst, solvent water and butanone into a reaction kettle, starting to stir and heat under the protection of nitrogen, slowly introducing ammonia gas, then slowly adding a hydrogen peroxide aqueous solution, and after the reaction is finished, carrying out centrifugal separation to obtain diacetylmonoxime; the preparation method comprises the following steps: adding hydroxylamine hydrochloride and water into a reaction kettle, stirring to dissolve the hydroxylamine hydrochloride and the water, dropwise adding acetaldehyde under cooling of an ice-water bath, and reacting; dropwise adding alkali liquor, and stirring to obtain an acetaldehyde oxime water solution; the method comprises the following steps: extracting an acetaldoxime aqueous solution with dichloromethane, drying an extract liquid with anhydrous sodium sulfate, fractionating at normal pressure to obtain most of a solvent, fractionating at reduced pressure, and collecting fractions to obtain anhydrous acetaldoxime; the modified catalyst disclosed by the invention is obtained by reacting a TS-1 molecular sieve, mercapto siloxane, (E)-1-allyl potassium trifluoroborate, allyl trimethyl stannane, methylbenzene and sodium ethoxide; the diacetylmonoxime and acetaldehyde oxime prepared by the invention have higher purity.

This invention relates to a catalytic membrane for HCl oxidation reaction, the preparation method of which includes: Step 1: reacting silica particles with SiO2. ­2 A mixture of ZrO2 sol and silica gel is coated onto a hollow fiber carrier and calcined to obtain a transition layer for the membrane. Step two: A silsesquioxane sol is applied to the transition layer obtained in step one and calcined to obtain a silica membrane. Step three: The silica membrane obtained in step two is subjected to impurity removal treatment. Step four: A solution of silane coupling agent (A) and a metal salt solution (B) are prepared separately and mixed to obtain solution C. The silica membrane treated in step three is immersed in solution C and grafted with nano-metal particles using ultrasonic assistance, followed by a high-temperature reaction to obtain a catalytic membrane. The catalytic membrane designed in this invention, when applied to the HCl oxidation reaction, can separate reactants and products simultaneously, causing the reaction to shift forward, increasing the reaction conversion rate, reducing the reaction temperature, and extending the catalyst lifetime.

The invention relates to the technical field of cables, in particular to a preparation process of a high-flame-retardance cable. According to the process, low-density polyethylene and an ethylene-vinyl acetate copolymer are adopted as matrixes, silane is grafted through twin-screw extrusion, then nano-composite flame retardants based on magnesium-aluminum layered double hydroxides, phosphine compounds, polyhedral oligomeric silsesquioxane and the like are introduced, and a proper amount of magnesium hydroxide, aluminum hydroxide and zinc borate are added for synergistic flame retardance and smoke suppression. The nano-composite flame retardant is subjected to multiple surface modification and function synergy, so that the interface bonding and dispersity can be remarkably improved, a compact carbonized and ceramic layer is formed, and low-smoke, low-combustion-spread and stable low-dielectric properties are realized.

The invention provides a method for preparing aerogel powder from waste gel, and belongs to the technical field of aerogel material preparation. The method comprises the following steps: by taking waste wet gel generated when an aerogel product is produced from an organic silicon source as a raw material, adding an ammonium fluoride solution, stirring and uniformly mixing, adding hexamethyldisiloxane, n-butyl alcohol and hydrochloric acid for modification, cooling and standing after modification, and separating out an upper-layer gel solution; stirring and cleaning with pure water, standing to obtain washing water, adding a sodium hydroxide aqueous solution, stirring and cleaning, and standing to obtain alkali washing water; and drying through closed-loop spray drying equipment to obtain the aerogel powder. According to the method, resource utilization of the waste gel is achieved, the production cost of the aerogel powder is reduced, environmental pollution is reduced, and the obtained aerogel powder has good hydrophobicity and heat insulation performance.

Disclosed are techniques for delaying initiation of coagulation and suppressing fibrin formation. The disclosed techniques may include providing a percutaneous blood pump that may include a metal or ceramic surface (such as a surface of a shaft, bearing, rotor, stator, etc.) that has been modified with a bifunctional modifier. The modified surface may be within a motor section and / or pump section of the blood pump. The modified surface may be configured to interact with blood. When blood is allowed to interact with the modified surface, a desirable microenvironment may be formed. The bifunctional modifier may be a functionalized aminosilane, a functionalized aminosiloxane, and / or a functionalized silanetriol. The blood pump may be configured to have a purge fluid pass through at least a portion of the motor section and / or the pump section. The purge fluid may be free of anticoagulants.

The application provides a sealant and a preparation method and application thereof. The sealant comprises the following components in parts by weight: 100 parts of alpha, omega-dihydroxypolydimethylsiloxane, 2.5-6.5 parts of a plasticizer, 80-100 parts of a filler, 8-15 parts of a crosslinking agent, 1.5-2 parts of a coupling agent and 0.1-0.2 parts of a catalyst, wherein the coupling agent is a reactant of an amino silane coupling agent and a hydroxyl-terminated polybutadiene. The amino silane coupling agent is chemically modified by using the hydroxyl-terminated polybutadiene, so that the adhesion and the moisture and heat resistance of the sealant can be significantly improved.

Disclosed are techniques for delaying initiation of coagulation and suppressing fibrin formation. The disclosed techniques may include providing a percutaneous blood pump that may include a metal or ceramic surface (such as a surface of a shaft, bearing, rotor, stator, etc.) that has been modified with a bifunctional modifier. The modified surface may be within a motor section and / or pump section of the blood pump. The modified surface may be configured to interact with blood. When blood is allowed to interact with the modified surface, a desirable microenvironment may be formed. The bifunctional modifier may be a functionalized aminosilane, a functionalized aminosiloxane, and / or a functionalized silanetriol. The blood pump may be configured to have a purge fluid pass through at least a portion of the motor section and / or the pump section. The purge fluid may be free of anticoagulants.