135 results about "Cyclic siloxane" patented technology

The invention discloses silicon-based synthetic leather and a preparation method thereof. The synthetic leather comprises base cloth, a silicone rubber layer and a surface treatment layer, wherein the surface treatment layer comprises vinyl-terminated polysiloxane, hydrogen-containing polysiloxane, a reaction inhibitor, a platinum catalyst, silicon dioxide microspheres, hyperbranched vinyl polyurethane and cyclic siloxane; the molar ratio of vinyl in the vinyl-terminated polysiloxane to silicon hydrogen in the vinyl-terminated polysiloxane is 1: (1.05-1.12), and the hyperbranched vinyl polyurethane is prepared by carrying out condensation polymerization on polyol acrylate and isocyanate in the presence of a catalyst and then carrying out end-capping reaction with a vinyl end-capping agent. The formula of the surface treatment layer is optimized, the molar ratio of vinyl to silicon hydrogen is 1: (1.05-1.12), dense vinyl of hyperbranched vinyl polyurethane (HVPUA) reacts with residual Si-H, interface bonding is enhanced by combining amino silane grafting, and silicone oil precipitation is reduced synergistically.

The invention discloses an organic silicon filler surface treating agent with asymmetric different ends, a preparation method and application, and belongs to the field of organic silicon materials. The different-end asymmetric organic silicon filler surface treating agent is prepared by the following steps: A, adding a mixed solution of an organic cyclic siloxane monomer and an initiator into a reaction kettle, then adding an organic alkali solution, and carrying out stirring polymerization reaction at room temperature for 1-6 hours; and B, adding chlorosilane and an acid-binding agent into the polymerized system in the step A to carry out an end-capping reaction, continuously stirring for 1-20 hours, and then removing low-boiling-point substances and filtering, thereby obtaining the product. The organic silicon filler surface treating agent is accurate in molecular chain structure, controllable in double-terminal active groups, simple in preparation process and mild and controllable in reaction process, is applied to surface modification treatment of heat-conducting (electric-conducting) inorganic filler, can remarkably improve the compatibility between the inorganic filler and an organic silicon polymer, and has a good application prospect in the field of heat-conducting (electric-conducting) inorganic filler surface modification treatment. The dispersity and the filling amount of the inorganic filler in the polymer are improved, the heat conduction (electric conduction) performance of the organic silicon composite material is improved, and the viscosity of the composite material is reduced.

The invention discloses an alcohol modified organic silicon emulsion as well as a preparation method and application thereof. The alcohol modified organic silicon emulsion is prepared by mixing and reacting the following components in percentage by mass: 20%-30% of cyclic siloxane, 1%-3% of epoxy alkoxy silane, 0.5%-5% of a nonionic surfactant, 5%-10% of an anionic surfactant, 1%-2% of strong acid, 0.1%-0.5% of a chain end capping agent, 1%-5% of hydroxyl-terminated polydiorganosiloxane and the balance of water. The alcohol-modified organic silicon emulsion can be mixed with amino-modified silicon emulsion or epoxy-modified organic silicon emulsion in proportion for use and is moderately cross-linked, so that a film can be formed to play a better role in protecting fibers, and the phenomenon of roll sticking caused by excessive cross-linking of the traditional amino-epoxy-modified organic silicon emulsion in the heating process can be avoided; and the fiber quality and the manufacturability are greatly improved.

The invention provides a nano-composite silicone rubber insulator with hydrophobic migration and a manufacturing method thereof, the nano-composite silicone rubber insulator comprises a core rod and an umbrella skirt sheath, and the umbrella skirt sheath comprises the following raw materials: a silicone rubber matrix, phenyl silicone rubber, linear polydimethylsiloxane, microencapsulated cyclic siloxane and a functional filler. Through a dual-mechanism hydrophobic migration system, a multi-scale filler framework and filler frameworks of different dimensions, a mechanically enhanced continuous path is provided, smoothness of a low-molecular-weight siloxane migration channel under a low-temperature condition is ensured, and through cooperation of anisotropy of the boron nitride nanosheets and microencapsulated cyclic siloxane, the low-molecular-weight siloxane migration channel is improved. The volatilization rate of low-molecular-weight siloxane under a high-temperature condition is reduced, and the hydrophobic migration stability of the insulator under severe environments such as low temperature and high temperature is greatly improved.

The invention relates to the technical field of anti-adhesion packaging material research and development, and discloses an anti-adhesion liquid packaging film and a preparation process thereof, and the preparation process comprises the following steps: synthesizing an octa-cyclohexyl double-layer cyclic siloxane monomer, carrying out an addition reaction on a Si-H bond of the octa-cyclohexyl double-layer cyclic siloxane monomer and an alkenyl functional group of an allyl silane coupling agent to obtain an octa-cyclohexyl double-layer cyclic siloxane monomer; preparing to obtain an organic-inorganic hybrid type connecting agent; the preparation method comprises the following steps: carrying out modification treatment on hydroxylated silicon dioxide nanoparticles through an organic-inorganic hybrid connecting agent, and then dispersing the modified hydroxylated silicon dioxide nanoparticles in a PE-SILICON-PE block copolymer matrix to prepare the anti-adhesion composite material. A film structure of a nine-layer co-extrusion film is arranged, an anti-adhesion composite material is introduced into a first layer and a ninth layer of the nine-layer co-extrusion film, a nine-layer co-extrusion blow molding film forming technology is adopted, the packaging film with the excellent anti-adhesion performance is prepared, and the packaging film can be applied to the field of packaging of non-Newtonian liquid products.

The invention discloses organic silicon synthetic leather and a preparation method thereof. The synthetic leather comprises base cloth, a silicone rubber layer and a surface coating layer, wherein the surface coating layer is prepared from the following raw materials in parts by weight: 20-70 parts of vinyl terminated polysiloxane, 5-30 parts of hydrogen-containing polysiloxane, 0.5-3 parts of a reaction inhibitor, 0.1-1 part of a platinum catalyst, 5-50 parts of silicon dioxide, 10-60 parts of silicon dioxide microspheres, 5-100 parts of cyclic siloxane, 10-50 parts of a polyurethane prepolymer, 2-10 parts of a polyisocyanate curing agent and 1-10 parts of a compatilizer; the polyurethane prepolymer is obtained by reacting polyhydric alcohol, hydroxyl-terminated polysiloxane and polyisocyanate according to the mass ratio of (60 to 80): (5 to 25): (15 to 25). The polyurethane is introduced into the silicone rubber to generate a synergistic effect, so that the compactness and hardness of a surface protection layer are improved, and the problem that the current organic silicon synthetic leather is poor in wear resistance and sebum resistance is effectively relieved.

The composition is an emulsion formed by mixing an oil phase and a water phase. The oil phase comprises squalane and cyclic siloxane, the water phase takes water as a solvent and comprises a surfactant and polyhydric alcohol, and the surfactant consists of decyl glucoside and cocamidopropyl betaine in a weight ratio of (1: 1)-(2: 1). The composition disclosed by the invention is applied to the medical instrument (such as an adhesive tape, a tension reducing device, an operation dressing and the like) adhered to the skin, and then the medical instrument is stripped from the skin. Through verification, the acting force for stripping the medical instrument is remarkably reduced, compared with three commercially available adhesive removers, the stripping force is also remarkably reduced by nearly one time, the irritation to the skin is slight and is equivalent to normal saline, adhesive residues on the surface of the skin can be mildly removed, and side effects caused by traditional solvent products to the skin are avoided.

Organic silicon compounds synthesized by a method for preparing such organic silicon compounds can act as or in functional fluids and for trapping water. The method includes reacting at least one alkoxy alkyl silane of the formula (Ia) and / or a cyclic siloxane of the formula (Ib) with at least one alkoxy alkanol of the formula (II). The reaction occurs in the presence of at least one acid or at least one base, optionally in a solvent, at a temperature of 0 to 200° C.

The invention relates to a base material of a self-lubricating sliding bearing as well as a preparation method and application of the base material. The base material comprises a component A, a component B and a component C, and the mass ratio of the component A to the component B to the component C is (0.4-0.8): (0.1-0.3): (0.1-0.3); wherein the component A is prepared from the following raw materials: vinyl cyclic siloxane, 1-thioglycerol and methacryloyl isocyanate; the component B is prepared from the following raw materials: a hexamethylene diisocyanate tripolymer and 2-hydroxy propyl methacrylate; and the component C is prepared from the following raw materials: a diphenylmethane diisocyanate tripolymer and 2-hydroxy propyl methacrylate. The compression strength and the compression modulus of the base material are both higher than those of commercially available resin, the bearing performance of the self-lubricating sliding bearing is greatly improved, meanwhile, the wear rate of the bearing is reduced through the high-crosslinking-degree resin, the gasket is more wear-resistant, and the service life of the bearing is prolonged.

The invention discloses a method for improving the synthesis reaction rate of lithium difluorophosphate, which comprises the following steps: in an organic solvent, taking lithium hexafluorophosphate, chain siloxane and / or cyclic siloxane as raw materials, and adding water accounting for 0.1-5.0% of the molar weight of the lithium hexafluorophosphate to prepare the lithium difluorophosphate. The method disclosed by the invention is simple in process and mild in reaction condition, and the reaction yield can be increased while the reaction time is greatly shortened.

The present invention discloses a composition comprising (A) an organohydrogensiloxane having a cyclic siloxane portion containing silicon-bonded hydrogen atoms. The composition also comprises (B) a polyether compound having an aliphatic unsaturated group. Finally, the composition comprises (C) a hydrosilylation catalyst. The present invention also discloses an organosilicon polyether surfactant prepared by reacting components (A) and (B) in the presence of component (C). In addition, an isocyanate-reactive component comprising a polyol and the organosilicon polyether surfactant is disclosed. A composition comprising the isocyanate-reactive component, an isocyanate component containing a polyisocyanate, and a catalyst is also disclosed. Finally, a method for preparing an article comprising polyurethane and / or polyisocyanurate foam, and an article formed by the composition and / or the method are disclosed.

The present invention relates to a polyether siloxane comprising at least one siloxane block and at least one polyether block, characterized in that the polyether siloxane comprises not more than 0.015 wt.-% of at least one cyclic siloxane D4 to D6.

An improved process for the preparation of high viscosity (i.e., greater than 1 million mPa·s at 25° C.) silanol-terminated silicone polymers and copolymers, often referred to in the industry as silanol-terminated silicone polymer gums. The silanol-terminated silicone polymer gums are made by the ring-opening polymerisation of organocyclosiloxane oligomers (alternatively referred to as cyclic siloxane oligomers) using a conical screw dump extruder (1). It also relates to silanol-terminated silicone polymer gums made by the process.

The invention discloses a UV (ultraviolet) organic silicon coating adhesive and a preparation method thereof, and relates to the field of UV organic silicon coating adhesives. An ultraviolet curing agent; a solvent; the organic silicon resin is polydimethylsiloxane, cyclic siloxane or a mixture thereof, the ultraviolet curing agent is at least one photoinitiator, the photoinitiator is selected from styrene, aromatic aldehydes, polymeric photoinitiators or a mixture thereof, the solvent is alcohol, organic solvent or a mixture thereof, and the additive is one or more additives. The prepared UV organic silicon coating adhesive can be rapidly cured, the coating adhesive can be cured within 10 seconds under the irradiation of UV light, the production efficiency is greatly improved, and the coating adhesive has excellent environmental protection property: low-organic-solvent configuration is adopted, the release of volatile organic compounds is reduced, the environmental protection requirement is met, and the environmental protection property is improved. The cured coating has excellent chemical resistance, high temperature resistance, weather resistance and excellent adhesive force.

The present application relates to the technical field of anti-adhesion packaging material research and development, and discloses an anti-adhesion liquid packaging film and a preparation process, which comprises the following steps: synthesizing octahexyl double-layer cyclic siloxane monomer, preparing an organic-inorganic hybrid type connecting agent through addition reaction of Si-H bonds of the octahexyl double-layer cyclic siloxane monomer and olefinic functional groups of an allyl silane coupling agent, modifying and treating hydroxylated silicon dioxide nanoparticles through the organic-inorganic hybrid type connecting agent, and then dispersing the hydroxylated silicon dioxide nanoparticles in a PE-SILICON-PE block copolymer matrix to prepare an anti-adhesion composite material; a film structure of a nine-layer co-extrusion film is arranged, the anti-adhesion composite material is introduced into the first layer and the ninth layer of the nine-layer co-extrusion film, and a nine-layer co-extrusion blown film process is used to prepare a packaging film with excellent anti-adhesion performance, which can be applied in the field of non-Newtonian liquid product packaging.

The invention discloses a performance-adjustable polyester-based multi-block thermotropic shape memory material and a preparation method thereof, and belongs to the field of high polymer materials. Adding a synthesized catalyst, a catalyst promoter and a chain transfer agent into a reaction kettle, then adding an organic solvent, selectively and uniformly mixing cyclosiloxane and a third monomer according to a certain proportion, then adding the mixture into the reaction kettle at a constant speed to prepare a biopolymer, then adding cyclic ester according to a certain proportion, and carrying out a first polymerization reaction at a certain temperature for a certain time to obtain a second polymer; a triblock polymer is prepared; and adding a chain extender into the reaction system, and carrying out a second polymerization reaction at a certain temperature for a certain time to prepare the multi-block polymer. The shape recovery of the multi-block polymer can be triggered by adjusting the temperature. By changing the monomer type and the feeding proportion, the polymer structure can be directly regulated and controlled so as to regulate and control the material performance. In addition, the polymerization reaction adopted by the invention is an atom economical route, the post-treatment is simple, no waste is discharged, and the method has a good industrial application prospect.

The present invention relates to a non-aqueous electrolyte comprising a lithium salt, an organic solvent, and an additive, wherein the additive comprises a cyclic siloxane compound represented by a specific chemical formula.

The invention discloses a silicone hydrogel polymer material for contact lenses and a preparation method thereof, and relates to the field of high polymer materials. Siloxane monomers, hydrophilic monomers and a dynamic cross-linking agent are mixed to obtain a monomer mixed solution; mixing functional nanoparticles, the monomer mixed solution and an initiator to obtain a pre-polymerized solution; according to the silicon hydrogel polymer material for the contact lens, the cyclic siloxane monomer and the linear siloxane are copolymerized to form a hydrophobic micro-area with a controllable size, the oxygen permeability is optimized, a borate bond is introduced as a dynamic crosslinking point, a network is reconstructed when ocular surface inflammation occurs, and the contact lens has the advantages that the contact lens is not prone to inflammation; functional nano-particle loaded anti-inflammatory and antibacterial components are released, and the high-oxygen-permeability, intelligent anti-inflammatory and antibacterial, ultra-durable and comfortable silicon hydrogel polymer material for the contact lenses is obtained.

The invention relates to a preparation method of sodium difluorophosphate, which comprises the following steps: S1, reacting sodium hexafluorophosphate with cyclic siloxane in an aprotic organic solvent at 50-80 DEG C, and filtering after the reaction to obtain a sodium difluorophosphate crude product and mother liquor; s2, the sodium difluorophosphate crude product is subjected to ultrasonic washing with a washing solvent, a sodium difluorophosphate wet solid is obtained, and the washing solvent is a mixed solvent of tetrahydrofuran and any one of dimethyl carbonate, ethyl acetate and ethylene glycol dimethyl ether; and S3, gradually heating the sodium difluorophosphate wet solid, carrying out vacuum drying, and introducing inert gas at intervals in the drying process for replacement. The method is wide in reaction raw material source, low in price, mild in reaction condition, convenient to operate and easy for industrial production; and the prepared sodium difluorophosphate has high purity and high yield, and can meet the relevant requirements of battery application.

The invention relates to the technical field of waterproof coiled materials, in particular to a macromolecular waterproof coiled material and a preparation method thereof. The waterproof roll structurally comprises the release film, the waterproof layer, the polymer layer, the aggregate layer, the polymer layer, the waterproof layer and the release film in sequence from outside to inside, and the problems that a waterproof roll is poor in waterproof effect and poor in aging resistance are solved. The polymer waterproof roll mainly comprises a release film, a waterproof layer, a polymer layer and an aggregate layer. The reaction temperature and time are adjusted by adjusting the types of cyclic siloxane in the aggregate layer and the waterproof layer; the synthetic plasticizer is added into the polymer layer; synthesizing polyarylsulfone, and adding the polyarylsulfone into the high-molecular waterproof coiled material, the component proportion of the raw materials of the polymer layer is changed; finally, bentonite is modified, and the modified bentonite is used in the waterproof layer. The prepared high-molecular waterproof coiled material is good in waterproof effect and high in peel strength after thermal aging.

The application provides a fluorine-free ester-based electrolyte, a preparation method and a high-voltage lithium ion battery. The fluorine-free ester-based electrolyte comprises a lithium salt, a fluorine-free solvent and a fluorine-free additive; the fluorine-free solvent is a methylated linear carbonate and / or a methylated linear carboxylate, and the fluorine-free additive is a cyclic boroxine or a cyclic siloxane with 3-5 carbon-carbon double bonds; the methylated linear carbonate has a general structural formula as shown in formula (1); wherein R1 and R2 are independently alkyl groups with 1-4 carbon atoms, and the carbon atom number of at least one of R1 and R2 is greater than or equal to 3; the methylated linear carboxylate has a general structural formula as shown in formula (2); wherein R3 is a hydrogen atom or an alkyl group with 1-4 carbon atoms, R4 is an alkyl group with 2-4 carbon atoms, and the carbon atom number of at least one of R3 and R4 is greater than or equal to 3. The fluorine-free ester-based electrolyte can significantly prolong the cycle life of the lithium ion battery.

The purpose of the present invention is to provide a curable resin composition which can be applied in a single layer, has sufficient adhesion to a cycloolefin copolymer base material, and has excellent moisture resistance. [Solution] A curable resin composition according to the present disclosure is a curable resin composition for coating a cycloolefin copolymer substrate, the curable resin composition being characterized by containing an alicyclic ketone compound and / or an alicyclic ether compound, and a cationically polymerizable silsesquioxane and / or a cationically polymerizable cyclic siloxane. Furthermore, it is preferable that the viscosity of the curable resin composition according to the present disclosure is 15 mPa * s or less at 25 DEG C.

Provided is a resin composition containing a polyaryl ketone, wherein the resin composition contains a polysiloxane, the polysiloxane contains a structure represented by formula (1), a peak corresponding to a cyclic siloxane is detected in pyrolysis GC / MS of the resin composition, and the content ratio of the polysiloxane in the resin composition is 0.25-1.25 mass%. (In formula (1), R1 and R2 each independently represent a C1-3 alkyl group.)

A preparation method and application of a polyorganosiloxane belong to the technical field of polyorganosiloxane preparation. The method includes putting cyclic siloxane, organosilane coupling agent and polyol into a reaction kettle, carrying out negative pressure nitrogen replacement to remove oxygen, and heating for reaction; controlling the temperature in the kettle, respectively dropping epichlorohydrin and propylene oxide, adding an acidic catalyst, carrying out aging reaction, removing unreacted monomers, and carrying out post-treatment to obtain a polyorganosiloxane product. The polyorganosiloxane prepared by the present invention has high reactivity, excellent water resistance and durability, and is suitable for the preparation of high-performance rigid polyurethane foam plastics.

A sulfur-containing cyclic siloxane can be produced through a simple process even under mild conditions by means of a method for producing a sulfur-containing cyclic siloxane, the method comprising: a ring-opening step for reacting a cyclic siloxane with a dihalosilane to obtain a chain siloxane; and a recyclization step for reacting the chain siloxane with a sulfurizing agent to obtain a sulfur-containing cyclic siloxane containing a sulfur atom as an atom constituting a portion of the ring structure.

The invention provides a sodium-ion battery electrolyte and a sodium-ion battery, and relates to the technical field of electrolytes. According to the sodium-ion battery electrolyte disclosed by the invention, the cyclic siloxane compound and the bicyclic sulfate compound of which at least one silicon atom is simultaneously connected with alkenyl and phenyl are added as electrolyte additives, so that the thermal stability of a sodium-ion battery is improved, and meanwhile, the interface impedance of the battery can be prevented from being increased; therefore, the obtained sodium ion battery has high-temperature stability and low interface impedance.

Provided is a thermally conductive silicone composition for forming a cured product, which exhibits high heat dissipation performance, does not produce voids, and has excellent processability. The thermally conductive silicone composition includes: an organopolysiloxane (A) containing an alkenyl group; a linear organopolysiloxane (B) having two or more hydrosilyl groups in one molecule; a hydrogenated cyclic siloxane (C) having only repeating units of-SiRHO-and having a degree of polymerization of 4 to 8; an addition reaction catalyst (D); and a thermally conductive filler (E). In the composition, the content of the component (C) is 0.5 to 1.8 parts by mass or less and the content of the component (E) is 500 to 3,000 parts by mass or less with respect to 100 parts by mass of the total amount of the components (A) and (B).

Provided is a method for producing a silane compound, which does not produce corrosive substances such as acids, does not use organic solvents and which contributes to a reduction in environmental load. This method for producing a silane compound has D) a siloxane decomposition step for heating a mixture containing: a siloxane compound A), which is a cyclic siloxane compound A-1) represented by formula (1), a linear siloxane compound A-2) represented by formula (2) and / or a silsesquioxane compound that is represented by formula (3) and has a siloxane bond as a main chain skeleton; a carbonate compound B) including at least one of a diaryl carbonate, a dialkyl carbonate and a monoalkylmonoaryl carbonate; and a basic compound catalyst C). The step D) further includes subjecting the siloxane compound A) to alkoxylation and / or aryloxylation. (In the formulae, R1 to R5, X, n, m and pare as described in the description of the present application.)

The present invention is a surfactant represented by the following general formula (1), wherein R1 independently represents a group selected from an alkyl group and an aryl group, R2 independently represents a group represented by the following general formula (2), R3 independently represents an alkyl group, R4 independently represents a group having a cyclic siloxane structure represented by the following general formula (3), a = 10 to 60, b = 1 to 30, c = 0 to 30, and d = 1 to 30, wherein A represents an alkylene group having 2 to 10 carbon atoms, R5 represents a hydrogen atom or an alkyl group, and "*" represents an attachment bonded to a silicon atom, wherein B represents an alkylene group, R6 independently represents a hydrogen atom or a group selected from an alkyl group and an aryl group, "g" represents an integer satisfying g = 2 to 5, and "*" represents an attachment bonded to a silicon atom. This provides a surfactant having a high effect of reducing interfacial tension.