173 results about "Epoxy matrix" patented technology

Various embodiments of an umbilical are provided. In one aspect, an umbilical is provided that includes a first tube, a second tube positioned in the first tube and a plurality of third tubes positioned in the first tube. Each of the plurality of third tubes has an inner polymer sleeve and an outer sleeve of carbon fibers in an epoxy matrix positioned around the polymer sleeve. The composite tubes yield a lighter umbilical that is easier to handle than a comparably sized conventional umbilical incorporating steel inner tubing and is more tolerant of dynamic bending and hydrostatic pressure loading.

The invention relates to high-temperature-resistant modified polyfunctional epoxy matrix resin for an advanced composite material. The resin comprises tetramaleimide resin, carboxy terminated nitrile rubber, polyfunctional epoxy resin, a curing agent and an organic solvent. A preparation method comprises the following steps of: adding the tetramaleimide resin, the carboxy terminated nitrile rubber and the polyfunctional epoxy resin into a reaction kettle and reacting at the temperature of 110 DEG C for one hour; adding the organic solvent and dissolving under stirring to obtain a component A;mixing the curing agent and the organic solvent and dissolving under stirring to obtain a component B; and mixing the component A and the component B and uniformly stirring during use. The high-temperature-resistant modified polyfunctional epoxy matrix resin provided by the invention has the advantages of high room temperature tensile shear strength, high heat resistance, wide application prospect in the fields such as electronics, micro-electronics, printed circuit boards (PCB), motors, aerospace and the like, simple preparation process, low cost and contribution to realizing industrial production.

An impact and fire resistant coating laminate is provided which serves as an outer protective coating for a pressure vessel such as a composite overwrapped vessel with a metal lining. The laminate comprises a plurality of fibers (e.g., jute twine or other, stronger fibers) which are wound around the pressure vessel and an epoxy matrix resin for the fibers. The epoxy matrix resin including a plurality of microspheres containing a temperature responsive phase change material which changes phase in response to exposure thereof to a predetermined temperature increase so as to afford increased insulation and heat absorption.

A tire assembly with integrated power generation features includes one or more piezoelectric devices and power conditioning modules. Piezoelectric devices may include a plurality of piezoelectric fibers embedded in a generally unidirectional fashion within an epoxy matrix, a piezoceramic wafer provided on a substrate and substantially surrounded by a protective casing, or a piezoceramic unimorph structure adhered with a thermoplastic polyimide to respective top and bottom conductive layers. Each piezoelectric device may include multiple piezoelectric elements connected in series and/or parallel arrangements, configured with respective poling directions in opposing or in-phase arrangements and/or configured in d33 or d31 displacement modes. Piezoelectric devices are preferably mounted within a tire or wheel assembly such that electric charge is generated therein as the wheel assembly moves along a ground surface and is subsequently stored in one or more energy storage devices. Stored energy may then be used to power electronics such as a tire monitoring system that wirelessly transmits such information as tire pressure, temperature and identification variables to a remote receiver location.

The invention relates to a super hybrid carbon nano material modified carbon fiber/epoxy matrix composite material and a preparation method thereof. The composite material an epoxy resin matrix material and an inorganic nano filler which is uniformly dispersed in the epoxy resin matrix material, wherein the composite nano inorganic filler is composed of graphene and carbon nanotubes. The excellent mechanical properties of the graphene and carbon nanotubes and the active functional groups on the surface are utilized to effectively enhance the mechanical properties of the epoxy resin matrix and the interface bonding strength between the matrix and the carbon fibers. The prepared composite material has excellent interlaminar shear property, and the interlaminar shear strength is enhanced from 50 MPa to 68 MPa.

An avionics chassis comprises a housing having a substantially thermally non-conductive frame comprising a composite of carbon fibers laid up in an epoxy matrix. The housing also includes at least two walls, at least one of which is a thermally conductive wall comprising a composite of carbon fibers in a carbonized matrix, and a plurality of spaced, thermally-conductive, card rails provided on the at least two walls. The at least two walls are mounted to the frame in opposing relationship such that corresponding card rails on the walls define an effective slot therebetween in which a printed circuit board may be received and the card rails and the at least one thermally conductive wall form a thermally conductive path from the interior to the exterior.

The invention discloses a preparation method of a graphene/nano silver epoxy conductive adhesive, which comprises the following steps: (1) mixing graphite, promoter and organic solvent, then carrying out ultrasonic treatment at 20-50 DEG C for 3-6 hours, standing for 12 hours, centrifuging, and distilling; (2) dissolving epoxy resin and precursor in organic solvent, stirring at 20-50 DEG C for 5-30 minutes, adding a graphene solution to continue reacting for 10-40 minutes, distilling, and carrying out ultrasonic treatment for 5-20 minutes; and (3) adding silver sheets into the graphene-nano silver epoxy resin compound, and carrying out ultrasonic treatment to react at 20-60 DEG C for 30-120 minutes so as to obtain the graphene/nano silver epoxy conductive adhesive. The graphene/nano silver epoxy conductive adhesive disclosed by the invention ensures that the graphene-nano silver compound can be uniformly dispersed in the epoxy matrix, and avoids the problem that the prepared graphene conglobates when the epoxy resin is added, thereby being beneficial to realizing the low-temperature sintering of the nano silver and improving the conductivity and adhesive strength of the conductiveadhesive.

The invention discloses an epoxy matrix resin, a prepreg, a preparation method of the prepreg and a device for preparation of the prepreg, in order to solve the problem of poor performance of an epoxy matrix resin curing substance caused by uneven toughening phase state even no phase separation in the traditional epoxy matrix resin curing product, the problem of complex technique of the traditional preparation method of the prepreg and relatively imprecise control on the resin content in the prepreg, and the problem of high manufacturing cost of the traditional device for preparing the prepreg. The epoxy matrix resin is prepared from a phenolic epoxy resin, a bisphenol A epoxy resin, a core shell polymer, a curing agent and a curing accelerator; the prepreg is prepared from the epoxy matrix resin and fiber woven cloth; and the prepreg is prepared through the device for producing the prepreg by a heat fusion method. After and before the resin is cured, the toughening phase state is not changed and is uniformly dispersed; and the toughening phase state effect is good and stable. The mechanical property of the composite material obtained by curing with the prepreg is high.

The invention provides a micron-nano modified epoxy matrix temperature resisting, heat conducting and insulating composite. The composite is prepared from, by weight, 30% to 60% of epoxy resin, 5% to 30% of polyfunctional group resin, 20% to 50% of epoxy hardener, 2% to 5% of epoxy toughening agent, 0.25% to 0.75% of curing accelerator, 5% to 15% of micron heat conducting filler, 1% to 3% of nano heat conducting filler and 1% to 2.5% of silane type coupling agent. According to the micro-nano modified epoxy matrix temperature resisting, heat conducting and insulating composite and a preparation method thereof, the polyfunctional group resin and the heat conducting filler are adopted for modifying a foundational epoxy system, so that the temperature resisting performance and heat conducting performance of the composite are greatly improved.

The invention relates to benzimidazole-epoxy matrix resin and a preparation method thereof. The resin consists of an A component and a B component. The preparation method comprises the following steps of (1) putting N,N,N',N'-tetraglycidyl-2,2-di-[4-(4-amino phenoxyl) phenyl] propane and 2-(4-amino phenyl)-5-amino benzimidazole into a reaction kettle, heating and raising the temperature to 70-80 DEG C, stirring and reacting for 15min-30min, adding a reactive diluent and an organic solvent, stirring uniformly, obtaining the A component, (2) mixing a curing agent with the organic solvent, stirring and dissolving uniformly, obtaining the B component, and (3) mixing the A component with the B component and stirring uniformly in a use process. The preparation method is simple; and the obtained matrix resin is excellent in comprehensive performance, can be applied to glass fiber or carbon fiber reinforced advanced composites, and can also be applied to adhesive agents of substrates such as metal, glass and ceramics.

A structural health monitoring system for a marine composite riser string is provided. Each riser pipe section includes a cylindrical form having an axis and also a carbon epoxy matrix. A sensor is associated with (e.g., embedded in) and substantially circumscribes the riser pipe section. The sensor includes a PolyVinyliDene Fluoride laminate and electrodes (e.g., conductive silver ink coating) so that the sensor generates electricity at the electrodes responsive to mechanical stresses and strains of the riser section, including vibrations. The system can also include a data acquisition system and digital signal analyzer to analyze signals responsive to the generated electricity at the electrodes of sensors and to provide health monitoring and damage detection for the marine riser pipe string, including impact damage and fatigue crack initiation. The system can further include a subsurface energy storage device and a plurality subsurface microelectromechanical devices coupled to the subsurface energy storage device.

The present invention relates to the field of nano-composite materials, and specifically relates to a halloysite nanotube / epoxy nanocomposite. The halloysite nanotube is a branched polymine grafted halloysite nanotube; the branched polymine grafted weight halloysite nanotube and epoxy resin are in the weight ratio of 0.2-20:100, preferably 0.5-5:100. The hyperbranched polymine is grafted onto epoxidized HNTs, so that the branched structure has rich amino groups to generate stronger chemical bonds or hydrogen bonds between the halloysite nanotube and an epoxy matrix and to enhance the interface effect. The prepared modified halloysite nanotube can effectively improve the impact resistance of epoxy resin and reduce brittle fracture of epoxy resin, and has broad application prospects in the fields of automotive, electronics, functional materials and aerospace.

The invention discloses high-temperature resistant and high-toughness epoxy matrix resin as well as a preparation method and an application thereof. The epoxy matrix resin is prepared from the following components by weight portion: 100 portions of epoxy resin, 20-60 portions of curing agent, 0.5-5.0 portions of curing accelerator and 5-50 portions of thermoplastic resin. The epoxy matrix resin has the glass-transition temperature of 210-235 DEG C, the tensile strength of 80-86MPa, the elongation at break of 3.0-3.3% and the tensile elastic module of 3.2-3.5GPa. The epoxy matrix resin can meet the requirement of carbon fiber solvent for preimpregnation process and hot-melt preimpregnation process, and after being cured by a proper process, the epoxy matrix resin has excellent comprehensive performance and particularly high-temperature resistance and high toughness, thereby being used for preparing high-performance composite material used in the aerospace field and meeting the requirement of the high technology field represented by the aerospace field.

The invention belongs to the field of organic/inorganic hybrid materials and discloses a low dielectric-epoxy resin/mesoporous molecular sieve hybrid material and a preparation method thereof. The hybrid material comprises the following components in portion by weight: epoxy resin prepolymer 70-91.2, mesoporous molecular sieves 0.1-12 and curing agent 8.8-25. The epoxy resin hybrid material containing mesoporous molecular sieves of the invention has a dielectric constant which is reduced by 0.1 to 0.9 at 100kHz compared with that of pure epoxy resin at 100kHz and retains the original excellentperformance of epoxy matrix resin at the same time. According to the preparation method of the invention, the mesoporous molecular sieves uniformly disperse in the resin and form an excellent boundary structure, and the obtained hybrid material has a low dielectric constant and an excellent thermal mechanical property and can be used in the fields of printed circuit boards, electronic package andthe like.

The invention provides a microcapsule. The microcapsule is of a double-layered structure. The material of an inner capsule wall is polyurethane resin. The material of an outer capsule wall is urea resin. A fluorescent pigment and an epoxy reparation agent are wrapped in the capsule walls. The microcapsule created by the invention has good compatibility with an epoxy matrix. The microcapsule is fractured under the effect of external stress to release reparation monomers for reparation, and meanwhile, the positions and conditions of damage occurring parts can be hinted through colour changes.

A flexible fiber-reinforced composite material is manufactured by impregnating a fiber reinforcement material with a non-epoxy matrix material. Subsequently, the impregnated fiber reinforcement material is dried and cured, resulting in a flexible fiber-reinforced composite material that exhibits a tensile modulus between 10 MPa and 42 MPa at 20 percent elongation.

The invention relates to a preparation method of a modified compound filler filled breakdown-resisting epoxy composite. The preparation method comprises the following steps: through the modification of a silane coupling agent gamma-APS, amino groups are introduced on the surfaces of Al2O3 and h-BN; hyperwheworries branched polymers (HBP) are grafted on the surfaces of the primarily modified fillers through taking the grafted amino groups as active sites to obtain a modified filler Al2O3-HBP and a modified filler BN-HBP; the two modified fillers are fully mixed with an epoxy resin matrix in different proportions; the epoxy composite is prepared through a two-step stepped heating and curing method. The alternating-current breakdown strength of the prepared epoxy composite shows the obvious cooperative behavior, the system breakdown strength can be regulated through changing the proportion of the fillers; when the BN-HBP accounts for 80 wt% of the compound filler, the performance of the BN-HBP is optimized, only 10 wt% of compound filler is added, and the alternating current strength of the epoxy composite can be improved by 15.7% as compared with that of the epoxy matrix.

An audio speaker including a bobbin-less voice coil having epoxy-bound winding layers is disclosed. More particularly, a voice coil may include a first winding layer and a second winding layer coaxially arranged about a central axis. The winding layers may include respective wire turns coiled about the central axis in a longitudinal direction. The winding layers may be bound by an epoxy matrix. For example, the epoxy matrix may be disposed radially between the first winding layer and the second winding layer to bond first wire turns to second wire turns, and to bond the winding layers to a speaker diaphragm.

Polyetherimide particles or powders with a high surface area and high porosity can be prepared by precipitation of polymer solution in hot water or steam without the use of any additives. The particles or powders produced rapidly dissolved in organic solvents as well as epoxy matrices.

The invention discloses an acrylate copolymer synthetized through simple free radical polymerization, containing an imidazole ring side group and applied to a latent epoxy curing accelerator to simultaneously toughen epoxy resin. Firstly, imidazole is grafted to a macromolecular chain, the catalytic activity of an imidazole ring can be reduced through a steric effect to achieve the latency purpose; secondly, an acrylate molecular chain participates in formation of an epoxy curing network, microphase separation is formed in an epoxy matrix, and the mechanical property of the epoxy resin is improved. The prepared imidazole latent epoxy curing accelerator having a toughening effect can improve the curing temperature of an imidazole catalyzed DGEBA/MHHPA curing system to about 180 DEG C and has good storage stability at room temperature.

The invention discloses a preparation method of a nanopolyaniline-containing compound anti-corrosion coating auxiliary agent, and relates to a polymer nano composite material. Monodisperse micron-graded poly(methyl methacrylate)glycidyl ester microspheres are obtained through dispersion polymerization; under an acid doped environment, aniline monomers are polymerized on the microsphere surface, polyaniline nanowires are loaded on the microspheres, and thus the micron-graded spherical anti-corrosion auxiliary agent is obtained; the auxiliary agent is mixed with epoxy matrix resin and all kinds of solvents for adjusting a coating, the microspheres are dissolved by a solvent, and at the same time, the polyaniline nanowires are dispersed in the coating; phenylamine has less use amount, can be highly dispersed, also has crosslinking functions, has large practical meaning, and has excellent industrialization prospect.

The invention discloses a nano-copper-containing epoxide resin composite material and a preparation method thereof. The preparation method comprises the following steps: sequentially adding a copper precursor, a protective agent, polyalcohol and epoxide resin to a reaction flask, increasing temperature to reaction temperature, and carrying out an in-situ thermal reduction reaction to obtain nano-copper/epoxide composite slurry; and dispersing the nano-copper/epoxide composite slurry into a solvent, adding a solidifying agent, and then solidifying at solidifying temperature to obtain the nano-copper/epoxide resin composite material. Nano-copper granules obtained by utilizing the method are uniformly dispersed in an epoxy matrix, the sizes of the nano-copper granules can be controlled between 50 nanometers and 250 nanometers, the mass fraction of the nano-copper granules can be controlled between 5% and 80%; the prepared slurry is free of impurities in such a way that appropriate precursor, reducing agent and protective agent are selected, and meanwhile, the slurry has good dispersion stability and oxidation stability in the organic solvent. The preparation method disclosed by the invention is simple in process and low in production cost, can be applied to the field of electronic packaging as an embedded type capacitor dielectric material and is suitable for large-scale industrialized production.

The invention relates to a high-performance epoxy resin composition for vacuum infusion molding and a preparation method of the epoxy resin composition. The epoxy resin composition is formed by the following components in parts by mass: 100 parts of mixed epoxy resin, 20-60 parts of curing agent, 10-40 parts of diluting agent, 0.5-5.0 parts of accelerating agent, and 0.5-5.0 parts of filling, wherein the epoxy resin comprises an epoxy resin a and an epoxy resin b; the epoxy resin a is a dicyclopentadiene (DCPD) type epoxy resin; and the epoxy resin b is a composition of a glycidyl amine type epoxy resin and a bispheno1-A diglycidyl ether type epoxy resin. The epoxy matrix resin provided by the invention is the composition of the dicyclopentadiene type epoxy resin, the glycidyl amine type epoxy resin and the glycidyl ether type epoxy resin; the obtained composition is characterized by low viscosity, high mechanical property, and good fire resistance; the unchangeable viscosity of enough long time of the composition is conductive to the permeation, the venting and the service life of the resin so that the requirements of molding large parts can be met.