23 results about "Resin cement" patented technology

The invention discloses a resin well cementation method for a carbon dioxide injection well, which comprises the following steps of: calculating the annulus volume between a small-diameter casing string and an original well casing according to the specification parameters of the casing; a well killing hydraulic well is used, and after well killing is completed, the small-diameter casing string is lowered to the preset depth, and then a well mouth is installed; the method comprises the following steps: injecting a first solution into an annulus between a small-diameter casing string and an original well casing until well killing fluid in the annulus and the small-diameter casing is completely replaced by the first solution; after well killing fluid replacement is completed, a second solution with the same volume as the annulus volume is injected into the small-diameter casing string, the density of the second solution and the density of the first solution are close and both smaller than the density of the well killing fluid, the second solution and the first solution are different in color, and a high-strength carbon dioxide corrosion resistant resin slug is injected into the annulus pump; the technical problem of resin well cementation in the overflow state of the carbon dioxide injection well is solved.

This invention relates to a polydopamine-containing bioactive resin cement that provides high adhesion quality even in moist environments for bonding two materials to each other.

The present invention relates to the technical field of epoxy resin cement, and in particular to an epoxy resin cement and a preparation method thereof. The epoxy resin cement comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1: (0.5-1.5); in terms of mass percentage, the component A is composed of the following raw materials: 8%-40% of a bio-based epoxy resin monomer, 52-84% of an epoxy resin, and a diluent balance; in terms of mass percentage, the component B is composed of the following raw materials: 88-94.4% of a curing agent, 0.5-3% of an accelerator, 5-8% of an inorganic filler, and a tin-containing Schiff base-modified carbon nanotube balance. The epoxy resin cement has excellent mechanical properties and anti-photooxidation properties.

The application discloses a surface microstructure for enhancing the shear bonding strength between a zirconia restoration and a resin cement and a preparation method thereof, wherein a surface microstructure formed by a plurality of cylinders arranged periodically is formed on the surface of the zirconia restoration through a DLP additive manufacturing technology. The surface microstructure for enhancing the shear bonding strength between the zirconia restoration and the resin cement of the application fundamentally improves the bonding force by greatly increasing the effective mechanical embedding area and providing three-dimensional mechanical locking anchors for the resin. The application builds the structure by layer-by-layer photocuring of slurry, and does not perform any mechanical impact or cutting on the formed zirconia embryo. The restoration can keep the surface microstructure and mechanical properties, and the anti-fracture ability in long-term use is improved.

The present invention provides a self-repairing device and method for repairing cracks in underground projects. The device comprises a steel grouting pipe, which is arranged inside the wall of the underground project; a plurality of sound wave transmitters are arranged around the wall of the underground project; a sound wave receiver is installed on the steel grouting pipe; the inlet of the steel grouting pipe is connected to a slurry storage tank; a spring switch vibration sensor is installed on the steel grouting pipe and above the sound wave receiver; a normally closed solenoid valve is installed at the upper end of the steel grouting pipe; a grouting discharge pipe is installed at the bottom end of the steel grouting pipe; a gravity sensing switch and a normally closed solenoid valve are installed at the bottom end of the steel grouting pipe; the steel grouting pipe is connected to an electric grouting pump for grouting, which is used to pump a mixture of epoxy resin latent curing agent and magnetic epoxy resin cement slurry into the steel grouting pipe. The device improves the repair speed of cracks in underground engineering structures, meets the needs of actual projects, and solves the problem that traditional construction methods cannot solve the problem of difficulty in repairing cracks in underground engineering structures.

The invention provides water-soluble resin cement paste for well cementation and a preparation method thereof, and the water-soluble resin cement paste is prepared from the following raw materials in parts by mass: 100 parts of oil well cement, 35-45 parts of quartz sand, 8-12 parts of hydrophilic epoxy resin emulsion, 0.8-1.2 parts of accelerant, 5-6 parts of high-temperature fluid loss agent, 1-1.5 parts of expanding agent, 3-5 parts of high-temperature retarder, 0.8-1.2 parts of flow pattern regulator, 0.5 part of defoaming agent and 35-45 parts of water. The cement paste system has the density of 1.89 + / -0.02 g / cm < 3 >, has the excellent mechanical properties of good paste sedimentation stability, low filter loss, adjustable thickening time, high strength, low elastic modulus and low permeability after being cured, effectively improves the toughness and interface cementation capacity of a cement sheath, improves the gas channeling prevention effect, and can meet the well cementation construction requirements of deep oil and gas wells.

The application belongs to the field of oil field chemicals, and particularly relates to a self-emulsifying resin curing agent, a curing system and a preparation method thereof. The preparation method of the self-emulsifying epoxy curing agent comprises the following steps: (1) mixing an epoxy resin E-44 solution with triethylenetetramine, and reacting to obtain a modified epoxy resin; (2) adding 2,3-epoxypropyltrimethylammonium chloride into the modified epoxy resin, and reacting to obtain the self-emulsifying epoxy curing agent. The self-emulsifying curing agent has high adaptability, small addition amount and simple on-site construction process. The self-emulsifying resin curing system for resin cement has significantly improved toughness and corrosion resistance.

The present invention relates to a cement slurry ground construction process and device suitable for non-water-soluble resin. The process comprises the following steps: S1, preparing slurry water: adding an emulsifier to clean water, or adding an emulsifier and a water-soluble additive to clean water, stirring evenly to obtain slurry water, and setting aside; S2, preparing a resin mixture: adding a curing agent to the resin, stirring evenly, and setting aside; S3, preparing base slurry: continuously supplying cement ash and slurry water to a slurry cement truck according to a formula ratio to prepare cement slurry; S4, continuously preparing resin cement slurry: continuously adding the resin mixture prepared in step S2 to the cement slurry prepared in step S3 according to a formula ratio, continuously stirring to form resin cement slurry; S5, continuously pumping the resin cement slurry into a well. Compared with traditional construction processes, the process of this scheme can continuously prepare resin cement slurry from solid cement, slurry water and non-water-soluble resin, and pump it into the well at a large displacement and constant speed.

The present invention relates to the field of drilling engineering and discloses a resin cement slurry, a preparation method thereof, and applications thereof. The resin cement slurry comprises the following components, measured in parts by weight: 100 parts of cement, 1-100 parts of epoxy resin, 1-80 parts of curing agent, 1-100 parts of skeleton material I, 1-100 parts of skeleton material II, 0.1-40 parts of setting agent, 0.1-40 parts of toughening agent, 1-40 parts of dispersant, 0.1-20 parts of fluid loss additive, 0.1-40 parts of defoaming agent, 1-100 parts of water, and 0-100 parts of density modifier. The resin cement slurry is prepared by selecting the components in the above-mentioned specific weight proportions. The slurry has good rheological properties and is easy to use for cementing construction. The resulting resin cement slurry has higher compressive strength, lower elastic modulus, and can be used for a long time at an operating temperature of 45-95°C.

A method for simulating oil sand sample by using epoxy resin cemented sandstone, comprising the following steps: step one: measuring sample mass and volume; step two: collecting oil volume, water volume, oil mass, water mass, and solid residue mass of rock sample containing oil and water; step three: calculating porosity, water saturation, oil saturation, and oil to solid residue mass ratio; step four: testing viscosity-temperature (viscosity-temperature) relationship curve; step five: component and content analysis; step six: particle size analysis and content analysis; step seven: configuring epoxy resin glue; step eight: configuring argillaceous cement in line with the natural oil sand; step nine: configuring artificial sample raw materials; step ten: designing cylindrical standard core pressing mold; step eleven: preparing standard artificial core by using artificial layer-by-layer tamping method. The method uses non-toxic epoxy resin to replace toxic natural asphalt to prepare artificial oil sand simulation sample, which meets the green, healthy and environmentally friendly standards.

In general, in one aspect, embodiments relate to a bulk dry cement that includes a dry blend of, a cement, a solid particle, and a solid resin accelerator, where the solid resin accelerator includes a liquid resin accelerator disposed and dried on the solid particle so as to be included in the bulk dry cement.

The utility model provides photopolymerization resin water gate even equipment of dispersing, relates to dispersing even equipment field, photopolymerization resin water gate even equipment of dispersing includes support, is fixedly installed with stirring tank on the support, is installed with rotating part on the stirring tank, is installed with rotating rod on the rotating part, and rotating rod one end extends to the inboard of stirring tank, a plurality of arc short boards are fixed with on rotating rod, a plurality of supports are still fixed with on rotating rod top position of a plurality of arc end plate, a plurality of arc long boards are fixed with one end of a plurality of supports, one end of a plurality of arc long boards is pasted to the inboard of stirring tank, a plurality of extrusion arc plates that distribute circularly are still fixed in the stirring tank, one end of arc short board is pasted with extrusion arc plate, a plurality of overflow holes are all set up on arc short board and arc long board, the utility model discloses material is extruded through arc short board and arc long board, improves the shearing effect of the equipment to material through the dispersion effect of extrusion and overflow hole.

The invention relates to the technical field of composite material interface enhancement, in particular to a method for inducing resin secondary permeation based on laser CFRP interface pretreatment, which comprises the following steps of: performing scanning processing on a to-be-glued surface of a CFRP matrix by adopting nanosecond pulse fiber laser to form a macroscopic flowing channel, and completely removing a resin layer in the channel and exposing carbon fibers or glass fibers, so as to realize the secondary permeation of resin on the to-be-glued surface of the CFRP matrix. Forming a primary structure; ultrafast laser is adopted for scanning on the surface of the macroscopic flow channel to form a nano-corrugated or micron-sized dendritic fractal secondary structure; uniformly placing a resin cementing agent on the surface of the secondary structure which is spliced on the upper layer and the lower layer to obtain a CFRP-cementing agent-CFRP structure joint; and the CFRP-cementing agent-CFRP structural joint is subjected to hot pressing treatment. According to the method, a composite micro-nano structure of a primary structure and a secondary structure is constructed on the surface of the CFRP in a layering manner, so that macroscopic spreading and microscopic permeation of the adhesive are remarkably promoted, and the interface mechanical occlusion and chemical bonding capacity is enhanced.

The application relates to the technical field of cementing materials, and discloses a cementing slurry for improving the cementing strength of an interface coal rock, a preparation method and application of the cementing slurry, which is composed of 50-150 parts of oil well cement, 5-50 parts of epoxy resin, 0.2-2 parts of a slow-release curing agent, 0.05-0.2 parts of a defoaming agent, 1.75-11 parts of an auxiliary agent and 40-80 parts of water in terms of mass fraction; the slow-release curing agent is prepared by substitution reaction and complexation reaction of imidazole organic matter, propylene carbonate and a transition metal chloride; the cementing slurry has good rheological performance, adjustable density, excellent compressive strength and low Young's modulus after cement curing, and can improve the cementing strength of the coal rock and the cement ring; the slow-release curing agent can be gradually released along with the cement hydration reaction, the crosslinking rate of the epoxy resin can be accurately controlled, the problem of abnormal thickening of the epoxy resin cementing slurry can be solved, a high-strength-low-elastic-modulus-strong-cementing resin cement composite material meeting the requirements of coal rock gas cementing can be formed, the safety of cementing construction can be ensured, and the long-term performance stability of the resin cement ring can be ensured.

The application discloses a kind of high-strength low-elasticity water-soluble resin cement paste, including the following weight parts raw materials: Portland cement 40-50 parts, resin modified material 10-15 parts, acrylic emulsion 5-10 parts, silicon nitride whisker 1-5 parts, borax 1-4 parts, nano alumina 1-5 parts, interface modifier 1-5 parts, ethanol 45-55 parts.The cement paste of the application is based on Portland cement, by adding resin modified material, silicon nitride whisker, nano alumina and acrylic emulsion and other raw materials, the strength performance of product is enhanced, at the same time, the resin modified material uses lanthanum sulfate solution, first stirring is mixed fully, then add tetra-n-propyl zirconate, N-2-aminoethyl-3-aminopropyl trimethoxysilane, modified nano silicon dioxide raw material contact reaction, after resin modification, the interface force effect between resin and inorganic raw materials is enhanced.

The reinforcing filler in the dental resin cement composition provided by the present invention has a particle size distribution that simultaneously satisfies D75-D25≤0.95μm, D25-D15≤0.7μm, and D50 of 0.5~1.0μm. Specifically, the present invention improves the chemical curing time, edge sealing, and linear shrinkage rate of dental resin cement by controlling the D15 / D25 / D75 and D50 of the reinforcing filler in the matrix and catalytic portions to have the above-mentioned specific numerical relationships.

The invention discloses a resin cement slurry system capable of being crosslinked in a high-temperature deep well and a preparation method thereof, and relates to the technical field of oil field well cementation. Comprising 400-500 parts of oil well G-grade cement, 350-400 parts of a weighting agent, 150-200 parts of silicon powder, 1-10 parts of a resin monomer, 7.6-12.2 parts of an auxiliary agent and a resin emulsion, the resin emulsion is prepared from 1 to 10 parts of bisphenol A epoxy resin monomer, 0.01 to 0.1 part of modified imidazole derivative curing agent, 0.3 to 1 part of emulsifier and 300 to 1000 parts of water; the modified imidazole derivative curing agent is obtained by modifying an imidazole derivative with a mixed solution of a benzoyl chloride solution and nitric acid and acetic acid; according to the resin cement paste system, the thickening time is well controlled, the system can react effectively only under the action of high temperature, well cementation can be carried out under the high-temperature and high-pressure environment of 100 MPa and 130 DEG C, and the on-site construction process is simplified.

According to the construction method for high-pressure water gushing plugging based on the self-converging expanding agent-epoxy resin cement slurry, the self-converging property of the magnetic admixture in the material and the radial expansion property of the expanding agent are utilized, and the advantages of high viscosity, fast solidification and high strength of the stone body of the epoxy resin cement slurry are combined; and efficient plugging of high-pressure sudden gushing water is achieved. The method comprises the following steps: firstly, sequentially coating a self-converging expanding agent and epoxy resin cement slurry on a magnetic rod by adopting a layered coating process from inside to outside, arranging a pressure relief pipe with a valve on the outer side, and enabling the pressure relief pipe and the epoxy resin cement slurry to be positioned on the same layer and completely wrapped by the slurry; then, inserting the magnetic bar coated with the slurry into the water inrush opening through hydraulic equipment, standing until the expanding agent is expanded, the slurry is completely attached to the inner wall of the water inrush body, and the slurry on the outer side reaches the preset strength, closing a pressure relief pipe valve, and recovering the magnetic bar; and finally, plugging slurry is injected into a gap formed after the magnetic bar is pulled out through a grouting machine, and finally plugging operation is completed.

The invention relates to a two-part dual cure dental composition with improved stability toward discoloration and premature polymerization. The dental composition comprises a Base Part and a Catalyst Part, the Base Part comprising polymerizable component(s) without an acidic moiety, optionally polymerizable component(s) with an acidic moiety, filler(s), transition metal component(s), peroxide component(s), stabilizer component(s) comprising a free-radical moiety, the Catalyst Part comprising polymerizable component(s) without an acidic moiety, filler(s), ascorbic acid component, photo-initiator system, stabilizer component(s) comprising a phosphite or sulfite moiety. The dental composition is in particular useful as bulk fill dental composite, dental resin cement, core build-up dental material or self- and dual cure dental adhesive. The invention further relates to an initiator system and the use of a stabilizer comprising a free-radical moiety.

The present invention relates to the technical field of testing the bonding strength of resin cement-bonded dental restorations, and particularly to a rapid prediction method for the bonding strength value of dental restoration materials based on machine learning. The steps are as follows: S1: Construct an optimal XGB prediction model; S2: Perform preliminary processing on the information to be predicted; S3: Input all relevant features; S4: Obtain the predicted bonding strength value range according to the binary classification result output by the operation model; S5: The prediction results provide a reference for the selection of restoration materials, the selection of bonding products, and the optimization and adjustment of bonding strategies; The present invention can be closely combined with the optimization of the bonding process of dental restoration materials. By real-time analyzing the physical and chemical performance parameters of the materials and combining its closed-loop control system with the prediction model, it provides a reference for the selection of restoration materials, the dynamic adjustment of bonding operation steps and operation parameters, realizes the optimal bonding effect of the restoration materials, improves the reliability and performance of the restorations in clinical applications, and extends the clinical service life of the restorations.

The invention relates to the technical field of well cementation materials, and provides well cementation cement paste capable of improving interface coal rock cementation strength and a preparation method and application thereof.The well cementation cement paste is prepared from, by mass, 50-150 parts of oil well cement, 5-50 parts of epoxy resin, 0.2-2 parts of a slow-release curing agent, 0.05-0.2 part of a defoaming agent, 1.75-11 parts of an auxiliary agent and 40-80 parts of water; the slow-release curing agent is prepared from imidazole organic matters, propylene carbonate and transition metal chloride through substitution reaction and complexation reaction; the well cementation cement slurry is good in rheological property and adjustable in density, has excellent compressive strength and lower Young modulus after being cured, and can improve the cementation strength of coal rock and a cement sheath. The slow-release curing agent can be gradually released along with cement hydration reaction, the crosslinking rate of epoxy resin can be accurately regulated and controlled, the problem that epoxy resin cement paste is abnormally thickened is solved, a high-strength-low-elastic-modulus-strong-cementing resin cement composite material meeting coal-rock gas well cementation is formed, well cementation construction safety is guaranteed, and the service life of the composite material is prolonged. The long-term performance stability of the resin cement sheath is ensured.

The invention belongs to the technical field of biomedical materials, and particularly relates to high-color-stability photocuring veneering resin cement which comprises the following components in percentage by weight: 20%-40% of acrylate monomers, 0.03%-0.3% of a photosensitizer, 0.03%-0.3% of a photoinitiator, 0.03%-0.3% of an inhibitor and 60%-80% of filler, wherein the photoinitiator is tertiary amine with an electron withdrawing group; according to the light-cured veneering resin cement with high color stability, the electron density of nitrogen atoms is reduced through a conjugation effect by using a tertiary amine initiator containing an electron withdrawing group, so that the occurrence of an oxidation side reaction is inhibited; meanwhile, after tertiary amine is oxidized to generate nitrogen free radical cations, an electron withdrawing group can still stabilize the intermediate and prevent the intermediate from being further decomposed into colored products, so that the color stability of veneering resin cement is continuously kept at a relatively high level in veneering repair, and teeth are kept attractive.

The utility model relates to the technical field of electrode needles, in particular to a parallel double-electrode needle which comprises a needle seat, built-in holes are formed in the needle seat and distributed along the two sides of the center of the needle seat, the electrode needles are arranged in the built-in holes in a penetrating and attaching mode, and each electrode needle comprises a plastic shell, a glass tube and a copper core. And the outer ring wall of the plastic shell and the inner wall of the built-in hole are arranged in a sliding and sleeving mode, the outer ring wall of the glass tube and the inner wall of the plastic shell are bonded and fixed through resin glue, a copper core is connected into the glass tube in a penetrating and sleeving mode, and the copper core and the glass tube are fixedly assembled through a screw. Through the needle seat structure, two adjacent electrode needles can be arranged side by side in parallel, and through mutual threaded movement of the threaded knob and the threaded sleeve, the threaded knob can drive the extrusion pad to extrude the plastic shell parts of the electrode needles, so that the position stability of the electrode needles is ensured, and the parallel arrangement position correspondence is ensured.