134 results about "Silicone Elastomers" patented technology

The invention relates to the technical field of PC resin flexibilizers, and discloses a shell-core structure styrene-acrylic resin modified organic silicon elastomer flexibilizer as well as a preparation method and application thereof in order to solve the problems that an organic silicon material and PC resin are poor in intersolubility, a traditional flexibilizer is poor in low-temperature toughening performance and the like. Comprising the following steps: uniformly mixing hydrogen-containing silicone oil, vinyl silicone oil, a third alkenyl functional component and a catalyst, and pre-emulsifying under the action of a surfactant and a thickener to obtain an organic silicon pre-emulsion SiE; uniformly mixing an alkenyl phenyl compound, acrylate and / or a cross-linking agent, adding a molecular weight regulator and an oil-soluble initiator, and pre-emulsifying under the action of a surfactant and water to obtain a styrene-acrylic pre-emulsion SAE; the preparation method comprises the following steps: firstly, preparing an organic silicon pre-emulsion, then heating the organic silicon pre-emulsion to carry out a water-phase hydrosilylation addition reaction, then dropwise adding the styrene-acrylic pre-emulsion to carry out suspension emulsion copolymerization, and then demulsifying and drying to obtain the styrene-acrylic resin modified organic silicon elastomer toughening agent with the core-shell structure.

The invention discloses a high-temperature-resistant organic silicon elastomer with high mechanical property as well as preparation and application thereof, and belongs to the technical field of functional materials. The high-temperature-resistant organic silicon elastomer with high mechanical property is prepared from the following raw materials: hydroxyl silicone oil, white carbon black nanoparticles, a silane monomer cross-linking agent, a silane coupling agent and stannous octoate, and the catalyst also comprises cage-shaped titanium oxygen cluster molecules. According to the invention, by simultaneously using the components, the composite high-temperature-resistant organic silicon elastomer material can be provided, the thermal collapse temperature of the material is almost 500 DEG C, and the composite high-temperature-resistant organic silicon elastomer material is good in thermal stability and mechanical tensile strength and wide in application prospect.

The invention discloses a silicone gel dressing and a production process thereof. The silicone gel dressing comprises a three-dimensional cross-linked organic silicone elastomer network and a stably dispersed functional unit, wherein the functional unit comprises a nanosheet layer reinforcing structure formed by stripping organic modified layered silicate and polysaccharide-based microspheres for encapsulating bioactive factors. The production process comprises the steps of nano pre-dispersion preparation, main component mixing and defoaming, active microsphere mild mixing and gradient curing structure forming. The contradiction between technical effect analysis and flexibility is solved through a nanosheet layer enhanced structure, the polysaccharide-based microspheres achieve slow release of bioactive factors, the air permeability and the adhesion are improved through a sandwich porosity gradient structure, the process is accurate and controllable, and the method is suitable for scar management.

The present invention relates to the use of silicone elastomers obtainable from defined addition cross-linked organopolysiloxane compositions in dielectric elastomer actuators (DEAs), which allow for significantly prolonged lifetime compared to prior art DEAs.

The present application belongs to the technical field of antifouling coating, and particularly relates to an enzyme-containing organic silicon fouling release type antifouling coating and a preparation method thereof. The coating is mainly composed of amphiphilic functional polymer and antifouling enzyme. The antifouling enzyme is fixed by the amphiphilic functional polymer containing amino groups, and the antifouling enzyme is kept active by the hydrophilic property of the amphiphilic functional polymer. The enzyme-containing organic silicon fouling release type antifouling coating is prepared by adding the amphiphilic functional polymer immobilized antifouling enzyme into an organic silicon elastomer system. The organic silicon chain segment is used as an oleophilic part, and the antifouling enzyme is used in combination with the amphiphilic functional polymer. The stability of the antifouling enzyme in the organic solvent system and the seawater environment is ensured, the organic silicon elastomer coating has good antifouling performance and good environmental friendliness, the antifouling performance is further improved, the enzyme immobilization technology can be applied to the surface antifouling of marine ships and structures, and the enzyme immobilization technology can be applied to the pharmaceutical industry and daily chemical industry.

The invention discloses wide-temperature-range silicone rubber-based rubber for aerospace thermal protection, a composite material and a preparation method of the wide-temperature-range silicone rubber-based rubber. According to the invention, three monomers, i.e., methylcyclosiloxane, hexaethylcyclotrisiloxane and phenylene silicon monomer, are subjected to ring opening and condensation copolymerization to obtain polysiloxane macromolecules containing three different chain link structures. A phenylene structure is introduced into a silicon rubber main chain, so that the silicon elastomer main chain is limited to form a volatile cyclic oligomer through a chain back-biting reaction and a chain segment rearrangement exchange reaction, the thermal stability is improved, and the initial decomposition temperature is up to 450.16 DEG C; the regularity of a molecular chain is broken by introducing ethyl, so that the glass-transition temperature is as low as 120.2 DEG C, and no crystallization phenomenon occurs. The base adhesive has excellent cold resistance, radiation resistance, ablation resistance, high temperature resistance and the like, and can be used as the base adhesive to be applied to the aspects of aerospace craft protective coatings, dynamic seal putty adhesives, sealants and the like.

The invention relates to the technical field of viscous materials, in particular to a low-temperature-resistant viscous material for a high-altitude damper. Comprising the following components: 30-50 parts of silicone rubber; 50-60 parts of modified silicone rubber; 10 to 30 parts of polar rubber; 20 to 50 parts of modified white carbon black; 10 to 40 parts of high rubber powder; 10 to 20 parts of a crosslinking accelerator; 10 to 50 parts of organic silicon elastomer micro powder; 1 to 3 parts of diphenyl silanediol; 1-5 parts of phenyl silicone oil; 1-5 parts of a damping agent; and 1 to 2 parts of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane. The prepared low-temperature-resistant viscous material can keep stable viscosity at an extremely low temperature, improves the adaptability in a wide temperature range, has efficient energy consumption capacity, has small influence on the structure, has excellent weather resistance, and can meet the requirement of low maintenance.

A silicone elastomer composition contains the following components: (a) hydroxyl-functional polyorganosiloxane gum; (b) pendant alkenyl-functional polyorganosiloxane gum; (c) silylhydride-functional crosslinker containing an average of at least 2 SiH groups per molecule; (d) hydrosilylation catalyst; (e) hydrosilylation inhibitor; (f) solvent; (g) optionally, terminal alkenyl-functional polyorganosiloxane gum that is free of pendant alkenyl groups; and (h) optionally, tetraalkoxysilane; where: (i) the silicone elastomer composition is free of MQ resin; (ii) the weight ratio of components (a) / (b) is in a range of 0.1 to 10; (iii) the mole ratio of (SiH) / (C＝C) is in a range of one to 20; and (iv) the weight percent of alkenyl groups relative to total weight of components (a), (b) and (g) is in a range of 0.035 to 1.00.

In a method of applying a desired texture to a surface of a silicone elastomer, an uncured silicone elastomer is applied to at least one side of a polymeric film. At least one side of the polymeric film has a complementary texture that is complementary in shape to the desired texture. The uncured silicone elastomer is cured while it is in contact with the at least one side of the polymeric film so as to form a cured silicone elastomer. The polymeric film is removed from the cured silicone elastomer so as to expose the desired texture on the surface thereof. The flexible polymeric film can be a bag placed into a breast prosthesis mold. The bag includes at least one interior surface with the complementary texture. The bag is removed from the cured silicone elastomer to expose the breast prosthesis having a textured surface.

The present invention relates to a thickened aqueous composition comprising from about 0.01% to about 10% by weight of a superabsorbent polymer, from about 0.1% to about 20% of a silicone elastomer; and from about 20% to about 98% of water.

A method for sealing joints in removable slabs (1a, 1b) separated by gaps (E) without fibrous elements, comprising, for at least one of said gaps: a. the creation of a joint backing by positioning at the bottom of said gap one or more elastic elements (2) made of preformed polymer foam with a cross-section adapted to fill the width of said gap (E), b. filling an upper portion of said gap (E), above the joint backing, with a layer of two-component silicone elastomer (3) curable by polyaddition, c. curing said two-component silicone layer (3) to create a removable sealing coating for said gap. Figure 3

The invention discloses a method for preparing highly uniform silicone elastomer gel by accurately controlling in-situ cross-linking reaction, and relates to the technical field of preparation of high polymer materials and organic silicone gel. The invention relates to a silicone sealant, which comprises the following components: a dispersion medium: 60 wt%-90 wt% of polyorganosiloxane; a first reactant: 10 wt%-30 wt% of polyorganosiloxane containing at least two aliphatic unsaturated groups in the molecule; a second reactant: 0.5 wt%-10 wt% of polyorganosiloxane, the molecule of which at least contains two silicon-bonded hydrogen atoms (Si-H); the catalyst is a platinum-based catalyst and is used for promoting the hydrogen silicification reaction. The preparation method comprises the following steps: 1, mixing a first reactant and a second reactant in a dispersion medium with the viscosity of 2-100 cSt, and removing oxygen through nitrogen substitution; and 2, adding a platinum catalyst into the mixture obtained in the step 1, and carrying out an in-situ cross-linking reaction on the polysiloxane containing the aliphatic unsaturated group and the polysiloxane containing the silicon-bonded hydrogen atom so as to directly form particles.

The application belongs to the field of new materials, and discloses a kind of organic silicon elastomer, which is prepared from branched hydrogen-containing silicone oil and crosslinking agent containing olefin bond function;The branched hydrogen-containing silicone oil is prepared from hydrogen-containing silicone oil and single-end vinyl silicone oil.The organic silicon elastomer is polymerized by using branched hydrogen-containing silicone oil and crosslinking agent containing olefin bond function, and the single-end vinyl silicone oil first occupies part of the Si-H bond of the hydrogen-containing silicone oil, the crosslinking agent occupies the remaining Si-H bond of the hydrogen-containing silicone oil, and a small amount of crosslinking is combined through the side chain winding in the elastomer, which improves the light transmittance and viscosity of the gel containing the elastomer.The application also provides a preparation method of the elastomer, daily chemical products containing the elastomer and the use of the elastomer.

This invention provides a novel silicone elastomer particle with excellent biodegradability and the ability to impart superior tactile and usability to cosmetics, as well as its uses. The biodegradable silicone elastomer particle has a structure in which at least two silicon atoms within the silicone elastomer particle are cross-linked through divalent organic groups containing hydrophilic groups, and the silicone elastomer particle contains -(R₂SiO₂) m The polyorganosiloxane structure represented by - (where R is an unsubstituted or halogenated alkyl group with 1 to 20 carbon atoms, an aryl group with 6 to 22 carbon atoms, or a hydroxyl group with 6 to 22 carbon atoms, and m is a number in the range of 1 to 1000).

Title: MATTE SOLID COMPOSITION COMPRISING A PARTICULAR NON-POLAR HYDROCARBONATE OIL, A LIPOPHILIC CLAY, AND METHOD FOR IMPLEMENTING IT. The present invention relates to a matte solid cosmetic composition, preferably in stick form, intended for application to the skin and / or lips, comprising: * at least 5% by weight, relative to the total weight of the composition, of at least one first non-polar hydrocarbon oil, saturated or unsaturated, preferably saturated, linear or branched, preferably branched, in C14-C19, * at least one mineral or organic filler comprising at least one lipophilic clay-type filler comprising at least one quaternary ammonium group, said lipophilic clay-type filler being present at a content of between 1 and 3% by weight, relative to the total weight of the composition, * at least one second oil selected from non-volatile hydrocarbon oils, polar or non-polar, different from the first oil.or non-volatile silicones, *at least one silicone elastomer in a form carried in at least one oil identical or different from the first or second oil. It also relates to a makeup and / or skin and / or lip care process, consisting of applying said composition.

A piezoelectric composite energy harvester (100) is disclosed, comprising a piezoelectric element (102) and an elastic cover layer (110). The piezoelectric element comprises a first electrode (104), a second electrode (106), and a piezoelectric layer (108), the piezoelectric layer (108) comprising a cross-linked silicone elastomer matrix and piezoelectric particles dispersed within the cross-linked silicone elastomer matrix. The elastic cover layer (110) is disposed over the exterior of the second electrode (106). The piezoelectric composite energy harvester is configured to bend, expand, contract, rotate, tilt, and / or move in any spatial direction.

Disclosed are methods to maintain the durability of silicone-thermoplastic composite articles, which comprise flame-retardant thermoplastics and silicone elastomeric materials, with age by incorporating a stabilizing additive in the silicone elastomeric materials. This disclosure also provides improved silicone-thermoplastic composite articles and uses for such silicone-thermoplastic composite articles. A silicone-thermoplastic composite article comprises: (i) a thermoplastic article comprising one or more flame-retardant additives, wherein the thermoplastic article has an available surface; and (ii) a cured silicone elastomer part in direct contact with the available surface of the thermoplastic article (i). The silicone elastomer part is the cured product of a silicone elastomer composition comprising from 0.25 wt. % to a maximum of 5 wt. % of a stabilizing additive. The stabilizing additive is selected from the group consisting of magnesium carbonates, magnesium hydroxy carbonates, magnesium oxide, and mixtures thereof.

The present disclosure relates to a process for preparing a coating composition (v) based on a methanol-terminated silicone / polyurethane hybrid prepolymer, the process comprising the steps of: (A) preparing a methanol-terminated silicone / polyurethane hybrid prepolymer; and (B) preparing the coating composition (v) based on the methanol-terminated silicone / polyurethane hybrid prepolymer by mixing the methanol-terminated silicone / polyurethane hybrid prepolymer prepared in (A) ((v) (a)) with optionally a cured silicone elastomer powder (v) (b); optionally silicon-free organic particles and / or microparticles (v) (c); a polyorganosiloxane (v) (d) containing at least two or alternatively at least three silicon-bonded hydrogen (-Si-H) groups per molecule; a polyisocyanate having three or more isocyanate groups per molecule, the polyisocyanate being in an amount such that the molar ratio of-OH groups of (v) (a) to-NCO groups in (v) (f) in the methanol-terminated silicone / polyurethane hybrid prepolymer-based coating composition (v) is from 0.95: 1 to 1.05: 1; and a platinum group metal-based catalyst (v) (g). The coating composition based on the methanol-terminated silicone / polyurethane hybrid prepolymer is prepared for use in silicone leather composites.

The present invention relates to novel cerium (IV) organometallic compounds, to a method for preparing said cerium (IV) organometallic compounds and to their use as condensation catalysts, for example for curing polyorganosiloxane polymers comprising at least two hydroxyl groups or hydrolysable groups per molecule and suitable condensation curable crosslinkers Use of the silicone composition. Such compositions may comprise various additives, and may be stored in a one-part or multi-part composition. The present disclosure also relates to silicone elastomers and cured silicone sealants and / or adhesives prepared by curing the composition using a cerium (IV) organometallic compound as a catalyst.

The invention discloses an anticorrosive coating with super-hydrophobic and self-repairing functions and a preparation method and application thereof.The preparation method comprises the steps that a two-dimensional carbon material is added into ethyl acetate to form uniform dispersion liquid, then an organic silicon elastomer and thermosetting resin are added in sequence, coating dispersion mixed liquid is obtained through magnetic stirring, and the coating dispersion mixed liquid is added into the two-dimensional carbon material to form the anticorrosive coating with the super-hydrophobic and self-repairing functions. Wherein the range of the mass ratio of the organic silicon elastomer to the thermosetting resin is 1: 0.5-1: 3, and the mass concentration of the two-dimensional carbon material in the dispersion liquid is 0.05-2 mg / mL. According to the anti-corrosion coating, self-recovery super-hydrophobicity within 5-15 minutes after damage is achieved through the molecular chain dynamic recombination characteristic of the organic silicon elastomer, the contact angle change is smaller than 5 degrees after 100 times of damage-recovery circulation, and performance degradation does not exceed 5% after the coating is continuously soaked in 10 wt% saline water for 100 hours. The anti-corrosion coating is widely applied to metal corrosion prevention, oil-water separation and solar evaporator preparation, a compact protection layer is formed on the metal surface, the anti-corrosion coating is free of corrosion after 1000 hours of neutral salt spray testing, the adhesive force reaches 0-1 level, and excellent comprehensive performance is shown.

This invention relates to organosilicon compositions crosslinked via a polyaddition reaction, intended for use in the production of thermally conductive elements. The organosilicon compositions comprise at least one organopolysiloxane A, each molecule having at least one C2-C bonded to silicon. 12 Alkenyl group; at least one organopolysiloxane B having at least two SiH units per molecule; at least one polyaddition catalyst C with a catalytically effective amount; and thermally conductive filler D, characterized in that the organopolysiloxane A has a linear structure, a viscosity of 50 mPa·s to 200 mPa·s at 25°C, and contains 130 ppm to 1000 ppm by mass of silicon-bonded OH groups.

The present invention relates to silicone compositions that are crosslinked by polyaddition reaction, intended to produce thermally conductive components. Said silicone compositions comprise at least one organopolysiloxane A having, per molecule, at least one C2-C12 alkenyl group bonded to silicon, at least one organopolysiloxane B having, per molecule, at least two SiH units, a catalytically effective amount of at least one polyaddition catalyst C, a thermally conductive filler D, and a non-reactive organopolysiloxane E that is liquid at room temperature, characterized in that the non-reactive organopolysiloxane E that is liquid at room temperature contains between 130 ppm and 1000 ppm by mass of OH groups bonded to silicon.

The application relates to the field of daily chemical personal care, in particular to a hydrophilic modified organic silicone elastomer with moisturizing performance and a preparation method thereof, which comprises the following components: a polysiloxane containing at least three Si-H units in the molecule; a divinyl-terminated polysiloxane; a hyaluronic acid-modified monovinyl polysiloxane; a polyethylene glycol-modified vinyl polysiloxane; a carrier fluid; and a platinum metal catalyst for silicon hydrogen addition. The organic silicone elastomer is hydrophilically modified by introducing hyaluronic acid fragments and polyethylene glycol segments, the moisturizing performance of the organic silicone elastomer is improved, the organic silicone elastomer can effectively enhance the moisturizing feeling of skin in cosmetic application, and dryness and tightness are reduced. The modified elastomer has good self-emulsifying properties, can easily form a stable gel system in a water-based or water-containing formula, simplifies the emulsification process, and improves the applicability and stability of the formula.

The invention relates to the technical field of functional resin, and particularly discloses an acrylic resin coated organic silicon elastomer PA (at) SE prepared through aqueous phase suspension emulsion polymerization and a preparation method and application of the acrylic resin coated organic silicon elastomer PA (at) SE. An inner core of the PA (at) SE is a polyorganosiloxane elastomer ViSE formed by hydrosilylation addition reaction of hydrogen-containing polysiloxane, ethylene polysiloxane and a third functional component, and the third functional component comprises vinyl acetate, allyl acetate, allyl phenyl ether, allyl benzyl ether, cyclohexyl vinyl ether, alpha-C8-18 olefin, 1, 6-hexadiene, 1, 2-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol, 1, 3-propylene glycol and 1, 3-propylene glycol. The additive is one or a mixture of more of 1, 9-decadiene, (poly) ethylene glycol diallyl ether and (poly) propylene glycol diallyl ether. The acrylic resin coated organosilicon elastomer PA (at) SE provided by the invention can be mutually soluble with PC resin and the like, and can also realize toughening and reinforcing effects when being applied to materials such as PC resin and the like.

The invention provides fluororubber with wear resistance and smoothness as well as a preparation method and application thereof, and belongs to the field of chemical materials. The rubber is prepared from the following raw materials in parts by weight: 100 parts of raw rubber, 1-3 parts of a vulcanizing agent, 0.5-3 parts of a cross-linking agent, 5-15 parts of reinforcing filler, 0.1-1 part of an internal release agent, 2-5 parts of an acid acceptor, 1-10 parts of organic silicon resin micro powder and 0.5-6 parts of silicon elastomer microsphere powder, the mass ratio of the organic silicon resin micro powder to the silicon elastomer microsphere powder is (1: 1)-(4: 1). By adding the organic silicon resin micro powder and the silicon elastomer microsphere powder, a double-phase synergistic slippage structure of rigid particles and elastic microspheres is constructed in a fluororubber matrix, an internal self-lubricating wear-resistant system is formed, and the fluororubber with high wear resistance and excellent surface smoothness is prepared by matching the specific addition parts and proportion of the organic silicon resin micro powder and the silicon elastomer microsphere powder. And the application range of the fluororubber in the field of intelligent wearing is expanded.

This disclosure relates to hydrosilylated (addition) curable silicone rubber compositions, silicone elastomer materials produced by curing said hydrosilylated (addition) curable silicone rubber compositions and having improved high-temperature (175°C) compression set according to ISO 815-1 Method A, and methods for preparing said silicone elastomer materials. This disclosure also extends to the use of such materials.

The present invention provides a silicone elastomer material. The silicone elastomer comprises a grafted VMQ polysiloxane; and the grafted VMQ polysiloxane is α,ω-divinyl polydimethylvinylsiloxane which is grafted with methyl thioglycolate, has a grafting ratio of >70%, and is end-capped with (CH2=CH)(CH3)2SiO1 / 2. The present invention further provides a preparation method for the silicone elastomer material. The silicone elastomer material has the advantages of low swelling ratio, high retention rate of mechanical properties, etc.

The present invention relates to an insulating device comprising an insulating body consisting of a hollow tube or solid cylinder made of ceramic or composite material and an unvulcanized extruded HCR / HTV silicone shielding shell. The present invention further relates to the use of a novel vulcanization method for crosslinking the addition-curing silicone elastomer used. According to the invention, infrared heat emitters (Fig. 2) are used for this vulcanization method, arranged radially at a defined distance around the rotating insulating device. The method comprises (a) providing an insulating body, (b) applying an adhesion promoter (primer) to the insulating body, (c) extruding the silicone profile onto the primed insulating body, (d) repairing and finishing the unvulcanized HTV silicone shielding shell, and (e) vulcanization with infrared heat emitters having a multi-stage temperature profile.The multi-stage vulcanization process prevents the formation of bubbles and foam in the silicone structure, which are detrimental to the electrical properties. In the first stage, reaction gases can diffuse through the not yet fully vulcanized silicone surface. In the second temperature stage, the silicone is completely vulcanized. The silicone material must be chemically adjusted to this process in terms of its reactivity (vulcanization curve). Unlike convection heat in conventional autoclave or oven processes, infrared heat radiation penetrates deep into the material, resulting in excellent adhesion of the silicone to the insulating body. This allows for vulcanization within the silicone volume, preventing bubble formation caused by reaction gases, as these gases can still escape through the open surface.

The invention discloses application of a Dow Corning SYLGARD 184 organic silicon elastomer in preparation of a three-dimensional cell culture medium, and belongs to the technical field of biological materials. The matrix is formed by mixing an A-agent prepolymer and a B-agent curing agent of SYLGARD 184 according to the weight ratio of (8-12): 1 and then curing at the temperature of 35-39 DEG C. The method is characterized in that the substrate can support cell attachment without plasma treatment, and surface modification can be carried out through I-type collagen to enhance cell adhesion, so that a unique dual-mode cell microenvironment regulation and control system is formed. The matrix provided by the invention is simple to operate, low in cost and high in batch stability, effectively overcomes the defects of uncertain components, complex hydrogel synthesis treatment and the like of the existing animal-derived matrix, and can be widely applied to three-dimensional cell culture, disease model construction and drug screening platforms.

An implantable soft tissue prosthesis device comprising a silicone elastomer-shell filled with silicone gel or liquid, which among the layers that constitute its shell includes a barrier layer formed of a low permeability silicone, which impedes the bleeding or diffusion of the silicone gel from the inside of the implant to its surroundings through the shell. This barrier layer is given a coloration different to the other layers of the shell, making it visible in the finished product. The coloration of the barrier layer gives the fabricator of the implant as well as to medical personnel, the possibility to identify the presence of the barrier layer and its homogeneity, improving the safety of the device.