115 results about "Cyclic siloxane" patented technology

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 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 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 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.

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 application discloses an energy-saving purification and precision filtration processing method of recycled silica gel materials, and relates to the technical field of high polymer material recycling. After waste silica gel is melted and plasticized, the waste silica gel is sequentially subjected to two purification procedures of ultrasonic field auxiliary dynamic self-cleaning step-by-step filtration and low-temperature vacuum membrane distillation ring removal, and waste heat generated in the two procedures is reversely transported to a front-end preheating plasticizing procedure through a closed heat-conducting fluid loop. A differential pressure feedforward composite control algorithm is used in the filtration procedure, a differential pressure change rate is used as a feedforward trigger signal to adaptively adjust the power and frequency of an ultrasonic transducer array, white carbon black secondary agglomerates are dispersed in situ, and the filter screen is flushed, so that continuous filtration is realized without shutdown. In the ring removal procedure, D3 to D6 cyclic siloxanes are targetedly removed in a vacuum environment of not more than 1 kPa at 130 DEG C to 160 DEG C by using oil-repellent modified PTFE hollow fiber membranes, the residual amount of D4 / D5 can be reduced to below 0.1 wt%, and secondary thermal degradation is inhibited.

To provide a release agent for plastics in the form of an organopolysiloxane emulsion having excellent storage stability, mechanical stability, wettability, and crack resistance, and with a low content of cyclic siloxane components of low polymerization degree, and a method for producing plastics for food container packaging employing the same.SOLUTION: The present invention provides a release agent for plastics and use thereof, characterized by being an emulsion having an average particle diameter of emulsion particles, as measured by a laser diffraction / scattering method, of more than 100 nm and 1,000 nm or less, the emulsion comprising: (A) 100 pts.mass of an organopolysiloxane having a kinematic viscosity at 25°C of 100 to 100,000 mm2 / s; (B) 0.1 to 18.0 pts.mass of an anionic surfactant; (C1) to (C3), three types of polyoxyethylene alkyl ethers having different contents (number of moles added) of oxyethylene units, each contained within a specific quantitative range; and (D) 35 to 100,000 pts.mass of water.SELECTED DRAWING: None

The application discloses a medical silicone gel for scar repair and a preparation method and application thereof, and belongs to the technical field of biomedical materials and tissue engineering. The medical silicone gel comprises the following components in percentage by mass: cyclic siloxane 1-10%, silicone 30-50%, polysiloxane polymer 10-30%, gel matrix 1-10%, and the balance is water. The silicone gel provided by the application is stable in property, has no cytotoxicity, has no skin irritation, is easy to spread, has good film forming property, has strong adhesion to skin tissue, has a tension reducing and pressure adding effect on scars, and has a better scar repair effect than that of a commercial product.

The invention provides a lithium ion battery, which comprises a positive plate, a negative plate, a diaphragm and an electrolyte, the negative plate comprises a current collector and a negative active material layer formed on at least one side surface of the current collector; the negative electrode active material layer comprises a negative electrode additive, and the negative electrode additive is selected from one or more of cyclic siloxane and chain siloxane; the electrolyte comprises a carbonic ester solvent, and the carbonic ester solvent comprises a first carbonic ester solvent, dimethyl carbonate and propylene carbonate. According to the lithium ion battery provided by the invention, the negative electrode additive is added into the negative electrode plate, and the proportional relation of the carbonic ester solvent and the negative electrode additive in the electrolyte is regulated and controlled, so that the porosity of the negative electrode plate and the adsorption capacity of the electrolyte are improved, the local electrolyte lithium salt concentration of the negative electrode plate is improved, and meanwhile, the lithium ion battery has strong adsorption on ester electrolyte and is beneficial to improving the lithium ion battery performance. And the desolvation process of lithium ions is accelerated, so that the fast charging performance of the battery cell is improved, and the cycle performance of the lithium ion battery is improved.

This disclosure relates to a method for preparing alkyl-functionalized polysiloxanes, comprising the steps of: I) reacting a silane oligomer with a hydroxyl-terminated polysiloxane in the presence of catalyst 1, and II) reacting the reactant obtained in step (I) with a capping agent in the presence of catalyst 2, thereby obtaining the polysiloxane. This method allows for flexible adjustment of the degree of polymerization and viscosity of the desired polysiloxane by adjusting the feedstock, making it suitable for different applications; it can introduce multiple alkyl functional groups and further functional groups to obtain dual-modified polysiloxanes; using linear hydroxyl-terminated polysiloxanes as starting materials significantly reduces the proportion of undesirable cyclic siloxanes in the equilibrium product; and the reaction is mild, simple to operate, and environmentally friendly.

This release sheet comprises a base material and a release agent layer provided on at least one side of the base material, wherein: the release agent layer is formed from a release agent composition containing (A) an alicyclic epoxy group-containing cyclic siloxane compound, (B) a carbinol-modified polyorganosiloxane, and (C) an acid catalyst; and the blending amount of the carbinol-modified polyorganosiloxane (B) with respect to 100 parts by mass of the alicyclic epoxy group-containing cyclic siloxane compound (A) is 3-15 parts by mass. According to said release sheet, a silicone component hardly migrates from the release agent layer, and the release force can be set low.

The invention discloses an organic heat-resistant additive, high-temperature-resistant transparent silicon rubber and a preparation method of the organic heat-resistant additive, and belongs to the field of organic silicon materials. The preparation method of the organic heat-resistant additive comprises the following steps: uniformly mixing a cyclic siloxane solution with lithium dimethyl vinyl silanolate, stirring at 25 DEG C for 12 hours, dropwise adding a metal chloride solution into a reaction system, stirring for reaction, and purifying to obtain metal hybrid vinyl-terminated polysiloxane, and dissolving the polysiloxane and thioether-containing silane in toluene, adding a platinum catalyst, carrying out a stirring reaction, and carrying out vacuum concentration to obtain the thioether-containing polysiloxane. The synthesized organic heat-resistant additive is added into liquid silicone rubber to prepare the high-temperature-resistant transparent silicone rubber. The organic heat-resistant additive disclosed by the invention has excellent dispersity and compatibility in the silicone rubber, can ensure the transparency, mechanical properties and processability of the material while remarkably improving the thermo-oxidative aging resistance of the silicone rubber, and meets the use requirements of special application scenes under some harsh conditions.

The present invention discloses a kind of alcohol-modified organosilicon emulsion and its preparation method and application. The alcohol-modified organosilicon emulsion is formed by the mixed reaction of the following components by mass fraction: 20%~30% of cyclic siloxane, 1%~3% of epoxyalkoxysilane, 0.5%~5% of nonionic surfactant, 5%~10% of anionic surfactant, 1%~2% of strong acid, 0.1%~0.5% of chain capping agent, 1%~5% of hydroxyl-terminated polydiorganosiloxane, and the balance is water. The alcohol-modified organosilicon emulsion of the present invention can be mixed with amino-modified silicone emulsion or epoxy-modified organosilicon emulsion in proportion, and is moderately cross-linked. It can form a film to better protect the fiber, and can avoid the sticky roller phenomenon caused by excessive cross-linking of traditional amino-epoxy-modified organosilicon emulsion during heating, and fiber quality and processability are greatly improved and improved.

The application discloses a reactive phosphate functional emulsifier and a preparation method thereof, relates to the technical field of emulsifiers, and comprises the following steps: mixing vinyl salicylaldehyde, ethyl acetate and triethylamine, stirring under an inert atmosphere, adding phenyl phosphorodichloridate in an ice bath, centrifuging, washing and drying after warming reaction to obtain a preform; ultrasonically mixing the preform with anhydrous ethanol, adding hyperbranched polyether amine, continuously ultrasonically mixing, then adding 2-amino-4-fluorothiophenol for constant-temperature reaction, washing and drying after removing the solvent to obtain a mixture; stirring the mixture with anhydrous ethanol and an initiator, high-speed dispersing cyclic siloxane, adding glycidyl methacrylate for heating reaction, washing and drying after gradient cooling and solidification to obtain the emulsifier; by introducing cyclic siloxane and hyperbranched polyether amine, a hydrophobic film and a hydrogen bond network hierarchical protection system are constructed, the hydrolysis resistance and the flame resistance of the emulsifier are improved, and the stability of water-based paint is improved.

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

A process to reduce siloxanes in a waste plastic pyrolysis oil composition is disclosed. The process can include contacting the waste plastic pyrolysis oil composition with a modified silica gel composition under conditions sufficient to produce a purified waste plastic pyrolysis oil composition. The purified waste plastic pyrolysis oil composition can have at least 50% by weight less siloxanes, preferably at least 60% by weight less siloxanes, as compared to the untreated waste plastic pyrolysis oil composition. The siloxanes can include acyclic siloxanes, cyclic siloxanes, or a combination thereof. The modified silica gel composition can include cobalt or iron compositions.

A process for producing high molecular weight silicones via ring-opening polymerization of cyclic siloxanes in the presence of a Lewis acid catalyst is described.