50 results about "Cyclic siloxane" patented technology

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.

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 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 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.

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.

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.

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.

The invention relates to a wafer surface modification composition and application thereof in preventing collapse of a high aspect ratio pattern. The composition comprises: (a) an organic solvent; (b) 0.1 to 1 wt% of a fluoropolymer; (c) 1 to 10 wt% of a silane coupling agent; (d) 1 to 10 wt% of a long-chain cyclic siloxane solvent; and (e) 0.01 to 0.1 wt% of a catalyst. During application, the super-hydrophobic film layer is constructed on the surface of the wafer, so that the Si / SiO2 / Si3N4 contact angle is increased from 44 degrees / 28 degrees / 18 degrees to 94 degrees / 102 degrees / 105 degrees or above, and the pattern of the wafer with the high aspect ratio structure does not collapse after being etched, cleaned and dried.

The invention discloses a silica gel chemical recovery process, and belongs to the technical field of silicone rubber. The process comprises the following steps: disassembling, sorting, crushing, cleaning and drying the waste silica gel parts; mixing the pretreated silica gel particles with a specific cracking catalyst, carrying out catalytic cracking in an inert atmosphere, and collecting condensed crude silicone oil; carrying out reduced pressure distillation, molecular distillation and adsorption refining on the crude silicone oil to obtain high-purity regenerated silicone oil which takes cyclic siloxane such as octamethylcyclotetrasiloxane as a main component; and carrying out balanced polymerization and end group regulation on the regenerated silicone oil, a cyclic monomer and an end group regulator to obtain the regenerated silicone rubber-based rubber. The regenerated liquid silicone rubber product is obtained by compounding regenerated silicone rubber base rubber, a cross-linking agent, a filler and the like and vulcanizing. Compared with the prior art, the recovery process has the advantages of less carbon emission and higher material purity, and meets the requirements of high-end products.

An electrostatic charge image developing toner contains alkylsilane-treated silica particles, cyclic siloxane, and toner particles.

The present invention relates to a black photosensitive resin composition comprising a black coloring agent, an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator, one or more of a cyclic siloxane compound containing an epoxy group and a silsesquioxane compound, a thiol compound, and a solvent, a black matrix formed using the same, and an image display device comprising the black matrix. The black photosensitive resin composition according to the present invention exhibits a pure taper shape even when low-temperature curing and a TMAH-based developer are applied, and can form a pattern with excellent reflectance retention rate, resolution, solvent resistance, and pencil hardness.

The invention discloses a method for removing trace boron and phosphorus impurities in trichlorosilane, which belongs to the technical field of chlorosilane purification, and comprises the following steps: adding a complexing agent into crude liquid trichlorosilane, carrying out complexation reaction, and rectifying the mixture obtained by the reaction to obtain the purified trichlorosilane, the cyclic siloxane and the chain siloxane have the advantages that the stability is high, new impurities are not easy to introduce, the compatibility with chlorosilane is good, and the like, so that ppb-level boron and phosphorus impurities can be efficiently removed; the trichlorosilane purified by the method is suitable for production of electronic-grade polycrystalline silicon.

The invention discloses a controllable polymerized gel electrolyte as well as a preparation method and application thereof. The controllable polymerization gel electrolyte is formed by in-situ polymerization of a controllable polymerization gel electrolyte precursor, and the controllable polymerization gel electrolyte precursor comprises the following components in parts by weight: 0.8-2.7 parts of a retarder, 5-27 parts of a cationic polymerization monomer, 15-35 parts of a lithium salt and 4-8 parts of a lithium salt additive; the retarder is a cyclic ether or cyclic siloxane compound with a substituent group containing fluorine atoms. By regulating and controlling the ratio of the retarder to the monomer, the gel process can be controlled, so that the electrolyte is kept in a liquid state at room temperature to be beneficial to storage and infiltration, and a gel structure is formed in situ at a high-temperature aging stage after the battery is assembled. The controllable polymerized gel electrolyte is suitable for a lithium ion battery, and the safety, the cycling stability and the interface compatibility of the battery can be remarkably improved.

The application discloses a detection method of total cyclic siloxane content, and relates to the technical field of instrument analysis. The detection method of near infrared is used to detect the sample, and in particular, 4875cm ‑1 4921cm ‑1 As the characteristic peak, the accuracy of the detection result can be effectively ensured, the influence of linear Si-O bonds, C=C bonds and the like on the detection is reduced, the detection efficiency is greatly improved, and the real-time detection of the total cyclic siloxane content in the cyclic siloxane removal process can be met.

The invention discloses tetraallyl ester-based tetramethyl cyclotetrasiloxane as well as a preparation method and application thereof, and the preparation method comprises the following steps: taking hydrogen-containing tetramethyl cyclotetrasiloxane (D4H) and an allyl ester compound as raw materials, and synthesizing the tetraallyl ester-based tetramethyl cyclotetrasiloxane in one step through hydrosilylation reaction catalyzed by a platinum catalyst. The synthesized tetraallyl tetramethyl cyclotetrasiloxane is used as a reactive diluent, the cross-linked network density of an ultraviolet (UV) curing system can be remarkably enhanced, and a unique cyclic siloxane skeleton structure of the tetraallyl tetramethyl cyclotetrasiloxane provides thermal stability and enables a material to maintain the low viscosity characteristic of lower than 50 mPa.s under the test condition of 25 DEG C; and excellent processing fluidity and molding adaptability are shown. The tetraallyl ester tetramethyl cyclotetrasiloxane prepared by the embodiment of the invention can be used as a reactive diluent to be applied to UV curing coatings, 3D printing resins and adhesives.

The present invention is an alkenyl group-containing cyclic siloxane derivative, which is characterized by being an addition reaction product of (i) an organic silicon compound represented by general formula (1) and (ii) an alkenyl group-containing cyclic siloxane represented by general formula (2). Due to this configuration, provided is an organic modified silicone that excels in safety and simple production steps, has low viscosity, and, when used in a curable composition, provides a cured product that has excellent hardness and permeability of light in a short-wavelength range.

Provided is a photosensitive resin composition for manufacturing an optical waveguide, the composition being capable of manufacturing an optical waveguide having excellent processability. The photosensitive resin composition for manufacturing an optical waveguide includes an organopolysiloxane satisfying both of the following requirements (ɑ) and (β), or a combination of an organopolysiloxane satisfying only the requirement (ɑ) and an organopolysiloxane satisfying only the requirement (β). Requirement (ɑ): containing at least one among a T unit having a structure in which three siloxane bonds and one organic group are bonded to one silicon atom, a Q unit having a structure in which four siloxane bonds are bonded to one silicon atom, and a cyclic siloxane structure. Requirement (β): containing an epoxy group, and having a refractive index of less than 1.5 for a cured product at a wavelength of 1,310 nm.

The invention provides a PC / ABS alloy material and a preparation method thereof, and the PC / ABS alloy material comprises polycarbonate, an acrylonitrile-styrene-butadiene copolymer and an organosilicon modified ABS master batch, and the preparation raw material of the organosilicon modified ABS master batch comprises cyclic siloxane containing Si-H bonds. The PC / ABS alloy material provided by the invention not only has excellent solvent resistance, but also has good thermal stability, heat resistance and mechanical properties.

The invention discloses an electrolyte, a battery monomer and a power utilization device, the electrolyte contains an additive, a lithium salt and a solvent, the additive comprises at least one of a cyclic siloxane additive and a cyclic silazane additive, based on the total mass of the electrolyte, the mass fraction of the additive is 0.1-15.0%, and the mass fraction of the lithium salt is 0.1-15.0%. The additive can be reduced and decomposed on the surface of the negative electrode prior to the solvent to form a solid electrolyte interface film (SEI) rich in polysiloxane, and the SEI has high mechanical stability, can significantly prolong the cycle life of the battery, and has wide application prospects.

The present invention relates to a process for removing an impurity from compositions by distillation, wherein the impurity is at least one cyclic siloxane and / or at least one short, linear siloxane, and the distillation takes place in the presence of at least one auxiliary substance selected from the group consisting of carboxylic acids having 1 to 8 carbon atoms, glycols, cyclic carbonates, sulfones and / or sulfoxides, and a mixture of any of these.

The invention provides siloxane-based liquid cooling oil and a preparation method thereof, and the preparation method comprises the following steps: placing a cyclic siloxane monomer in an inert atmosphere, adding an acid catalyst and a base catalyst, and carrying out an acid-base dual-catalysis ring-opening polymerization reaction to obtain methyl-phenyl copolymerized siloxane, carrying out high-temperature distillation on the methyl-phenyl copolymerized siloxane to obtain siloxane-based liquid-cooled oil carrier liquid; the method comprises the following steps: adding a tertiary amine catalyst and deionized water into an organic alkoxy silane monomer and a fluoropropyl substituted alkoxy silane monomer, and carrying out a hydrolytic condensation reaction to obtain a siloxane precursor which comprises a liquid micro-network precursor and a hydrophobic chain segment precursor; the siloxane-based carrier liquid and the siloxane precursor are stirred and mixed according to a preset mass ratio, vacuum defoaming is performed after functional auxiliaries are added, the siloxane-based liquid cooling oil is obtained, and the functional auxiliaries comprise a polyether grafted dispersing agent and a low-molecular silicone oil rheology modifier. The defects that traditional liquid cooling oil is prone to blistering and dielectric gliding are effectively overcome.

To provide hollow particles having pores inside the particles and capable of homogenizing the properties of a material to which the hollow particles are applied, and to provide a method for producing the hollow particles.SOLUTION: The present invention is a hollow particle containing a structure derived from a cyclic siloxane compound, wherein the cyclic siloxane compound has a cyclic skeleton composed of a siloxane bond, a polymerizable unsaturated group is bonded to at least one of silicon atoms constituting the cyclic skeleton, and the coefficient of variation of the particle diameter is 25% or less.SELECTED DRAWING: Figure 1

The present invention provides a novel cyclic siloxane compound that can be used as a curable composition and is also useful in reducing carbon dioxide emissions, a curable composition containing the cyclic siloxane compound, a cured product obtained by curing the curable composition, an adhesive containing the curable composition, and a method for producing the cyclic siloxane compound. [Solution] A cyclic siloxane compound having a structure in which a cyclic carbonate group represented by the following formula (5) is present in the molecule. TIFF2026061903000014.tif69140

This invention discloses a polycarbosiloxane-coated fluorescent material and its emulsion preparation method, belonging to the field of fluorescent material technology. The preparation method includes: mixing a phosphor (the object to be coated), a polysiloxane precursor containing silane-hydrogen bonds, a vinyl-containing cyclic siloxane, and a catalyst to form a homogeneous oil-phase mixture; dispersing a surfactant in deionized water to form a homogeneous aqueous phase; dropwise adding the oil-phase mixture into the aqueous phase to form an oil-in-water emulsion; and performing a crosslinking polycondensation curing reaction at elevated temperature to form a polycarbosiloxane coating layer on the phosphor surface. This preparation method is simple, mild, and highly versatile. The fluorescent material obtained by this method has a continuous, superhydrophobic SiOC coating layer on its surface, exhibiting excellent stability under high temperature and high temperature and high humidity environments.

The present invention relates to a process for removing cyclic siloxanes from compositions comprising at least one polyalkylsiloxane and at least one cyclic siloxane by distillation, wherein the distillation takes place in the presence of at least one auxiliary substance selected from the group consisting of glycols, cyclic carbonates, sulfones and / or sulfoxides, and / or a mixture of any of these.

To provide a new synthetic method capable of precisely controlling the molecular weight and molecular weight distribution of a produced polymer by suppressing a depolymerization reaction which is a reverse reaction in a polymerization reaction of polysiloxane or the like.SOLUTION: It has been found that by using a novel co-catalyst system comprising an organic base compound and an imidazole analogue, a depolymerization reaction can be highly suppressed in a ring-opening polymerization using cyclic siloxanes as monomers, and a polysiloxane having a desired molecular weight and molecular weight distribution can be obtained.SELECTED DRAWING: None