113results about How to "Reduce crosslinking" patented technology

The present disclosure relates to reticulated elastomeric matrices, and more particularly to at least partially degradable elastomeric elements that are compressible and exhibit resilience in their recovery and that can be employed in diverse applications including, without limitation, biological implantation, especially in humans.

The present invention provides a method for the preparation of a cross-linked hydrophilic coating of a hydrophilic polymer on a substrate polymer surface of a medical device, involving the use of a polymer solution comprising 1-20% by weight of a hydrophilic polymer, 0-5% by weight of additive(s), and the balance of a vehicle with plasticizing effect on the hydrophilic polymer, wherein the vehicle comprises at least one plasticizer having a solubility in water of at least 6 g / L, a boiling point above 210° C. at 760 mmHg, and Hansen δH parameter of less than 20. Furthermore, the invention provides a medical device, e.g. a catheter or guide wire, provided with such a hydrophilic coating. The invention also provides the use of specific polymer solution for the preparation of a cross-linked hydrophilic coating.

The invention discloses a secondary aluminum battery and a preparation method thereof. The material of the positive electrode of the battery is organic polysulfide, the material of the negative electrode is aluminum or aluminum alloy, and the electrolyte is halogen aluminic acid ionic liquid; and the organic polysulfide is polysulfide carbine, thereby solving the problems that the elementary active substance is bad in conductivity and the frame is collapsed due to the dissolving of the reducing product. The electrolyte used is non-aqueous ionic liquid so that no oxide film, corrosive product or colloidal secondary product can be produced on the surface of the aluminum negative electrode so as to reduce the capacity loss of the negative electrode; the oxidation reduction reaction of the aluminum electrode in the electrolyte is reversible; and the battery is rechargeable. The preparation method for the secondary aluminum battery comprises the following steps: (1) preparing positive active material paste; (2) coating the positive active material paste on a foam nickel base, baking the paste and rolling the base into a positive plate; (3) rolling the positive plate, glass fiber non-woven membrane and the negative electrode made by taking any one of aluminum powder, aluminum foil and aluminum alloy as the negative active material into a battery core and arranging the battery core in a nickel-plated steel shell; then adding organic electrolyte in the steel shell; and sealing the steel shell to make the AA-type cylindrical secondary aluminum battery. The invention further discloses a preparation method for the positive material polysulfide carbyne of the battery.

The invention discloses a super-light plastic formula for sports shoe soles, and the formula comprises the following components in parts by weight: 59-69 parts by weight of ethylene-vinyl acetate copolymer, 11-21 parts by weight of polyolefin elastomer, 5-15 parts by weight of metallocene polyethylene, 5-15 parts by weight of acidic ethylene copolymer, 6-8 parts by weight of talc powder, 0.7-1.0 part by weight of zinc oxide, 0.5-0.8 part by weight of stearic acid, 0.6-1.0 part by weight of zinc stearate, 0.5-0.8 part by weight of flowable agent A, 0.3-0.6 part by weight of accelerated bridging agent, 0.25-0.5 part by weight of bridging agent and 4.8-5.4 parts by weight of foaming agent. Plastic soles of sports shoes produced by the technical scheme have super-light performance and the comfort which are unmatched by the ordinary plastic formula, have durable comfort, durable damping performance and other performances and can greatly reduce the consumption of physical strength of athletes.

The invention relates to a subway train autonomous positioning device, system and method based on multivariate information fusion, belongs to the technical field of railways, and solves the problem that an existing train positioning system depends on trackside equipment. The device comprises inertial navigation equipment used for carrying out autonomous navigation positioning on a subway train andcalculating inertial navigation positioning information; visual equipment used for monitoring an image beacon arranged at a fixed position beside a subway line track and calculating visual positioning information; and data processing equipment used for receiving the reported information of the inertial navigation equipment and the visual equipment, carrying out information fusion to obtain fusedpositioning information, sending the fused positioning information to an ATP system of the subway train, and carrying out auxiliary control on each stage including train leaving, inter-station operation, train pull-in station / garage and train stop-in station / storage. Common-cause failure caused by positioning equipment with the same principle and characteristics is avoided, and the amplification problem in the positioning precision transmission process and the influence of failure of subordinate equipment on the positioning precision of superior equipment are prevented.

The invention relates to a method for increasing polyolefin grafting efficiency. The method comprises the steps of weighing the raw materials in parts by weight: 99.88-83.0 parts of polyolefin, 0.1-12.0 parts of polar monomer, 0.01-3.0 parts of initiator and 0.01-2.0 parts of antioxidant, dissolving the polar monomer in a solvent, dissolving the initiator in anhydrous ethanol, uniformly mixing the polyolefin, the antioxidant and the solution of the polar monomer in a high-speed mixer, adding the mixture into a hopper of an extruder after the solvent of the polar monomer is volatilized, pumping the anhydrous ethanol solution of the initiator into different heating sections of the extruder according to different speeds, and subjecting extrudate to drawing, cooling, drying and granulating, thereby obtaining polar monomer grafted modified polyolefin granules. According to the method, the number of local free radicals is effectively prevented from being too high, the occurrence of side reactions such as polyolefin bridging or degrading is remarkably lowered, and the polyolefin grafting efficiency is greatly increased.

The invention discloses a non-woven fabric surface heavy nitrogen coupling gelatin adsorbing material and a preparation method thereof. The method comprises the following steps of: grafting an unsaturated monomer with carboxy to the surface of a macromolecule non-woven fabric base material by using an ultraviolet induction technique so as to introduce the carboxy; furthermore introducing aromatic amine through catalytic condensation of aroma diamine and carboxy; subsequently, converting the aromatic amine into diazo salt; coupling and immobilizing the gelatin on the surface of the non-woven fabric through diazo coupling reaction; and finally, soaking in hot water and eliminating the uncoupled gelatin so as to prepare the non-woven fabric surface diazo coupling gelatin absorbing material. The absorbing material is good in hydrophilicity, namely, the water absorption rate is greater than 292.3%; the solid load and the absorption rate of the gelatin can be adjusted in a large range, the absorbing material has high absorption capability for tannin; and when the tannin concentration is 200-400mg / L, the balance absorption capacity is within 16.8-53.2mg / g, and the absorption balance can be achieved within 3 hours.

Active-carbon-containing colloid gas foam for preventing gas emission in a gob is provided, wherein active carbon powder is dispersed into water and is added with certain amount of thickener to prepare an active-carbon-containing thick solution at a certain concentration, and small amount of cross linking agent and foaming agent are added into the solution and is physically and mechanically stirred and foamed under the action of air to prepare the active-carbon-containing colloid gas foam. After the colloid gas foam is injected into the gob through a slip casting pipeline of a mine, a large area of float coal in the gob can be covered and the coal crack can be blocked, the active carbon is used to fully adsorb the free gas in the gob, and meanwhile, a film-shaped colloid covering material like cloth is formed on the surface of the coal to achieve the purpose of long-lasting effective inhibition of emission of the coal gas. The effect of the active-carbon-containing colloid gas foam on preventing gas emission in the gob is remarkable, the cost is low, and the prospect of application is wide.

The invention discloses a method for synthesizing high molecular weight instant anionic polyacrylamide, which is characterized in that: an alkaline hydrolysis method is adopted, and comprises the following steps of: preparing aqueous solution of acrylamide monomer from the acrylamide monomer by using deionized water, adding a hydrolytic agent, a composite initiator and an auxiliary agent, regulating the pH value to be between 8.5 and 12, introducing nitrogen, expelling oxygen and sealing a system at the temperature of between 10 and 25 DEG C, polymerizing under the heat insulation condition, and hydrolyzing, crushing, drying and grinding to obtain instant anionic polyacrylamide solid powder with the viscosity-average molecular weight of 15,000,000 to 21,000,000 and the dissolution time of shorter than 0.5 hour. A novel coordination agent and a novel pH value regulator are adopted, the method is easy and convenient to operate, the initiation speed of the monomer is high, the dissolution speed of a product is high, the reaction rate and the molecular weight of the product are controllable, the method is suitable for production on different scales, and the product is suitable for industries such as papermaking dispersants, tertiary oil recovery, beneficiation, sewage treatment and the like.

The invention discloses an environment-friendly crosslinking and gelling retarding profile control agent and a preparation method thereof and belongs to the field of enhanced oil recovery technologies for oilfields. The profile control agent comprises a primary agent, i.e. hydrophobic association, a crosslinking agent, i.e. aluminum citrate, an antioxidant, i.e. sodium sulfite, and a retarding agent, i.e. sodium malate, and contains all the ingredients in percentage by weight: 0.1-0.4% of hydrophobic association, 0.01-0.02% of aluminum citrate, 0.015-0.025% of sodium sulfite, 0.005-0.020% of sodium malate and the balance of water. The profile control agent disclosed by the invention has the characteristics that the profile control agent is environment-friendly and is free of damage / injury to environments / human bodies; the crosslinking is retarded, and the gelling time is prolonged, thereby being beneficial to high-dose injection and deep profile control; the plugging rate is high; and the profile control agent has certain temperature-resistant and salt-tolerant performance and scouring resistance. The profile control agent can be used for adjusting a water absorption profile of a water-flood well and improving the water-flood development effect of oilfields.

The invention discloses a multilayer rice straw matrix block for machine-transplanted seedlings and a seedling raising method. The method comprises the steps that 1), non-decomposed straw fiber with the length being 5-30 mm, 10-day-decomposed straw fiber and 20-day-decomposed straw fiber are prepared; 2), decomposed straw fiber is prepared; 3), decomposed and extruded straw fiber is prepared through a twin-screw extruder; 4), pulping is conducted by means of the non-decomposed straw fiber, the decomposed straw fiber and the decomposed and extruded straw fiber in sequence, suction molding is conducted, and the multilayer rice straw matrix block is obtained. The matrix block is small in bulk density, high in water-holding porosity, good in mechanical property during transplantation and highin rice seedling rate; the matric block is applicable to machine-transplanted seedling raising.

The invention discloses a retarded crosslinking deep profile control agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The deep profile control agent is prepared from the following components by mass concentration: 0.1-1.0% of hydrophobically associating polyacrylamide, 0.1-1.0% of cyclodextrin / phenol clathrate, 0.1-0.5% of urotropine, 0.1-0.4% of citric acid, and water serving as a solvent. Hydrophobically associating polyacrylamide is novel water-soluble polyacrylamide, and has critical association concentration; when the concentration of a polymer is greater than the critical association concentration, a hydrophobic group generates intermolecular association, so that the viscosity of the solution is greatly increased and the solution displays good performances such as temperature resistance, salt resistance, shearing resistance and the like. Phenol is slowly released by the competitive clathration of the hydrophobic group in hydrophobically associating polyacrylamide on phenol, so that the gelation time can be effectively retarded; meanwhile, the gelation time can be regulated and controlled, so that deep profile control is selectively carried out on high-permeability reservoirs, large ducts, cracks and the like.

The invention discloses a nylon toughener, and a preparation method and application thereof. The preparation method comprises the following steps: putting polyolefins in a plasma reactor, vacuumizing, introducing gas, and carrying out surface treatment on the polyolefins by using low-temperature plasma so as to generate hydroxyl, carboxyl and other active groups on the surface, thereby obtaining the surface-modified polyolefins; and carrying out reaction on the surface-modified polyolefins, a polar compound and an antioxidant to obtain the polar-compound-graft-modified polyolefins, which are the nylon toughener. The low-temperature plasma technique is utilized to increase the types and concentration of the active groups (such as hydroxyl, carboxyl, carbonyl and amino) generated on the polyolefin surface on the premise of not introducing any free-radical initiator, thereby enhancing the grafting efficiency.

The invention relates to a low molecular weight amino latent crosslinker, which is formed by urea or mixture of urea and low molecular weight polyamine. The low molecular weight polyamine is aliphatic or aromatic diamine or triamine. The diamine is dicyandiamide and the triamine is melamine; and the urea and the melamine are mixed according to a weight ratio of 2:1. A spray polyurea elastomer is generated by reaction of an isocyanate component (A component) and an amino compound (B component); the amino compound of the B component comprises amine-terminated resin, an amine-terminated chain extender and a low molecular weight amino latent crosslinker accounting for 0.1% to 5% of the B component. The low molecular weight amino latent crosslinker has easily-obtained materials, convenient processing and relative cheap price, and can reduce the cost of SPUA. As the low molecular weight polymer amine is influenced by ortho-atoms or atom groups, electronegativity of nitrogen atoms in the amino group is reduced, thus utilizing the electron effect to reduce the reactivity of the amino groups and isocyanate.

The invention relates to a regenerated brick prepared from papermaking sludge and a preparation method thereof. the invention solves the problem of restricted utilization ratio of bricks prepared from papermaking sludge, and overcomes the defects of low compression resistance, low breaking strength, poor air permeability and the like in the bricks prepared from papermaking sludge. The preparation method comprises the following steps: mixing and stirring 35-40 parts by weight of papermaking sludge with the water content of 45-55%, 20-25 parts by weight of power plant sintering ash, 40-45 parts by weight of clay, 2.5-4 parts by weight of flame-retardant permeable fiber monofilament, 3-5 parts by weight of blind coal, 3-5 parts by weight of water-soluble resin and 4-7 parts by weight of water to obtain a wet material; and extruding with an extruding machine to obtain a blank strip, cutting into green bricks, naturally drying in air, and sintering in a kiln.

The invention discloses a multilayer straw substrate for rice hole tray dry nursery seedling. The multilayer straw substrate comprises an expanded long stalk fiber layer, an expanded short stalk fiberlayer, a decomposed long stalk fiber layer, a decomposed short stalk fiber layer and a substrate layer; for the multilayer straw substrate, crop straw fiber obtained after rubbing and crushing are conducted is mixed with dung water for fermentation, decomposed straw fiber is obtained, by means of the extrusion expansion process, cellulose in long fiber straw is relieved, the cross-linking property between fiber and fiber is weakened, it is guaranteed that nutrient elements are reserved to the maximum extent and fully absorbed by rice seedlings, it is also guaranteed that the rice seedling rate is high, and additional fertilizer is not needed in the seedling raising stage; the root vigor is high, seedling emergence is neat, the cost is low, the dosage of the expensive substrate such as grass carbon is greatly reduced, the straw is recycled, and the phenomenon that due to misuse, the environment is affected is avoided.

A disclosed antistatic flame-retardation circuit board comprises a circuit board main body, a sealing layer arranged on the circuit board main body, and a protective layer arranged on the sealing layer; the sealing layer fixedly seals the side, carrying electronic components, of the circuit board main body; and the protective layer wraps the sealing layer. The side, possessing soldering tin, of the circuit board main body is provided with a heat radiation layer, and the heat radiation layer and the circuit board main body are in connection by employing a mutually-matched concealed, overlapped or plug-in way; the circuit board main body is provided with a plurality of through holes, one side of the heat radiation layer is provided with a groove, the groove is filled with a heat-conduction liquid, and the heat-conduction liquid is capable of freely flowing in the groove and the through holes; and the connection position of the heat radiation layer and the circuit board main body is sealed by using pouring silica gel. The circuit board possesses excellent antistatic, moistureproof and electrical-isolation performances, also possesses the characteristics of good flame retardation, heat radiation and the like.

The invention relates to the field of iron and steel waste recycling equipment, in particular to a stirring-type magnetic separation device which can effectively improve the magnetic separation efficiency of dry magnetic separation and does not affect material transportation. The stirring-type magnetic separation device comprises a rotating bearing piece and multiple groups of magnetic conductiveteeth distributed on the surface of the bearing piece, wherein the magnetic conductive teeth rotate along with the bearing piece, and each group of magnetic conductive teeth are distributed on the surface of the bearing piece in the circumferential direction. Multiple groups of magnetic conductive teeth are parallel to one another, and a magnetic device is arranged in the bearing piece. The magnetic conductive teeth are used for transmitting the magnetic force of the magnetic device. When the magnetic conductive teeth move along with the bearing piece, materials can be stirred to a certain extent, so that the materials are looser. Meanwhile, the magnetic conductive teeth can go deep into the middle of the materials and make direct contact with the materials, thereby reducing the adsorptiondistance, and improving the adsorption effect.

The present invention provides a process to make a gelatine hydrolysate, a gelatine hydrolysate, and gelatine compositions including gelatine hydrolysates. More specifically, the invention provides gelatine compositions having a reduced tendency to cross-link and improved dissolution properties.

The present invention relates to the use of tocopherol as a co-catalyst in the ring opening polymerisation of cyclic siloxanes. The present invention further relates to a method for manufacturing hydrophilic polysiloxanes, wherein a hydrido-containing cyclic siloxane is reacted with a hydrophilic molecule comprising a carbon-carbon double bond, having the general formula (I) H2C═CH—(CHR)n—O—(CHR1CR2R3)mR4 or (II) H2C═CH—(CHR)n—R5, wherein n is an integer from 0 to 4, m is an integer from 0 to 5, R, R1, R2, R3 and R4 are each independently hydrogen or a C1 to C6 alkyl, R5 is a saturated cyclic hydrocarbon containing carbonyl group, in the presence of a first catalyst to obtain a monomer, and polymerising said monomer in the presence of a second catalyst and tocopherol as a co-catalyst.

The invention discloses a preparation method of a graphene-based hydrogel with a three-dimensional network structure and photo-thermal desalted water treatment application of the graphene-based hydrogel, and belongs to the technical field of fresh water purification, seawater desalination and high-salt concentrated water desalination deep treatment. The method comprises the following steps: ultrasonically dispersing a graphene oxide solution with the concentration of 10mg / mL into deionized water to prepare a uniformly dispersed flocculent-free graphene oxide solution; adding tris (hydroxymethyl) aminomethane hydrochloride into the uniformly ultrasonically dispersed graphene oxide solution, stirring for dissolving, and keeping the pH of the solution to be weakly acidic by tris (hydroxymethyl) aminomethane hydrochloride; adding dopamine hydrochloride, stirring and dissolving; and carrying out hydrothermal reaction on a uniformly mixed solution at high temperature, and carrying out post-treatment to obtain the polydopamine functionalized graphene-based hydrogel. The graphene-based hydrogel prepared by the one-step method is simple in preparation method, wide in raw material source, easy to operate, low in cost, short in period, low in energy consumption and high in repeatability.

The invention relates to the technical field of polymer material modification, and particularly discloses a polypropylene material having high melt strength and a preparing method thereof. The methodincludes (1) fully mixing 100 parts of polypropylene powder, 2-30 parts of a grafting monomer and 0.01-2 parts of an initiator; and (2) reacting the mixture at 110-140 DEG C for 1-2 h, cooling the reaction product, then adding 0.5-1.5 parts of an antioxidant, and granulating the mixture through an extruder to obtain the polypropylene having high melt strength. Through adjusting the ratio of the polypropylene, the grafting monomer and the initiator, a prepared product is stable in quality, excellent in processing performance and prone to industrial production, and can be applied in the fields of blow molding, vacuum thermal forming, extrusion coating, foaming, and the like.

The deep wood chip gel plugging agent is used in water injecting well to plug the high penetrating band in thick oil stratum to lower ineffective water circulation. The deep plugging agent consists of high molecular weight anionic polyacrylamide of molecular weight over 19 million and hydrolysis degree of 25-30 % 0.15-0.5 wt%, phenol compounded polyamine 0.1-0.3 wt%, resorcinol 0.01-0.02 wt%, oxalic acid 0.1-0.2 wt%, wood chip 0.5-2.5 wt% and water 96.48-99.14 wt%, which are compounded into water solution of 0.86-3.52 wt% water solution. The present invention has low use concentration, controllable gel forming time and viscosity, low cost and simple compounding process.

The invention relates to the field of organosilicone, and in particular relates to a method for preparing controllable viscosity hydroxyl-terminated polydimethylsiloxan. The method comprises the steps of: mixing hydrolysate with water, adding a reagent A and a reagent B to remove impurities under proper temperature, then standing and separating so as to obtain the required hydrolysate; polymerizing the hydrolysate under the catalysis of a KOH alkaline glue at 100-140 DEG C, adding a phosphoric acid aqueous solution to neutralize when a reaction system reaches the required viscosity, and heating to remove low molecular weight substances so as to obtain the 107 silicon rubber. By utilizing hydrolysate pretreatment, the influences of impurities such as chloride ions and chain links with three functional degrees to the system are greatly reduced; and the viscosity of the system can be slowly and uniformly increased through controlling a catalyst, and the reaction is easy to control.

The invention discloses a dispersible flocculant, a preparation method and application thereof. The preparation method comprises the following steps: completely dissolving an acrylamide monomer, a dimethyl diallyl ammonium chloride monomer, poly dimethyl diallyl ammonium chloride and inorganic salt with deionized water, stirring in a 40 to 65 DEG C thermostatic waterbath, adjusting the pH value ofa reaction system to be 3 to 8, leading nitrogen for protection, adding a composite initiator K2S2O8-NaHSO3-V50, and ensuring that reaction is performed at 40 to 65 DEG C in nitrogen atmosphere, so as to obtain a cationic polyacrylamide dispersible flocculant. In dispersible cationic polyacrylamide (CPAM) dispersoid, the relative molecular weight of the cationic polyacrylamide polymer is high, the viscosity of the dispersoid is low, and the stability is high.

The invention relates to a preparation method of a polycarbosilane blended resin hot-melt prepreg, and belongs to the technical field of preparation of silicon carbide ceramic-based composite materials. Liquid polycarbosilane and solid polycarbosilane are mixed according to the mass ratio of (3: 7)-(1: 1) to obtain a polycarbosilane mixed system with the viscosity ranging from 5*10<3> Pa.S to 3*10<5> Pa.S; firstly, the polycarbosilane mixed system is heated and melted to form a system with the viscosity ranging from 1.5 Pa.S to 50 Pa.S, release paper is coated with an adhesive film with the uniform thickness at the temperature of 60 DEG C-80 DEG C, and the mass of the adhesive film accounts for 30%-40% of the sum of the mass of the adhesive film and the mass of the release paper; and when the pressure roller temperature of the hot-melt impregnation machine is controlled to be 60-90 DEG C and the impregnation speed is controlled to be 3-6m / min, the upper and lower layers of adhesive films and the middle layer of fiber cloth are compounded together in a hot-pressing manner to obtain the polycarbosilane blended resin hot-melt prepreg. The method is simple in process, short in period, high in production efficiency and low in preparation cost, and the prepared prepreg is stable in glue content, low in volatile matter content and good in laying property.

The invention provides a dendritic organic boron crosslinker, and belongs to the technical field of organic boron crosslinkers. The dendritic organic boron crosslinker is characterized in that dendritic polyhydroxyl macromolecules are used as a complexing agent, the dendritic polyhydroxyl macromolecules have a spherical structure, and hydroxyl groups are distributed on the surface of a spherical shell and the inner part of a spherical body. Both two kinds of hydroxyl groups can participate in complexing of boron atoms in boron-containing compound. For the boron atoms in complexing at the innerpart of the spherical body, the boron atoms can also be complexed with other hydroxyl groups in the spherical body during a diffusion process even the boron atoms diffuse outside the spherical body due to dissociation, so that the diffusion speed is greatly reduced. Compared with a traditional micromolecular complexing agent, crosslinking of the boron atoms with other components in fracturing liquid is further delayed by the dendritic polyhydroxyl macromolecules, and an effect of reducing construction frictional resistance is more obvious; data of the embodiment show that the delayed crosslinking time of the dendritic organic boron crosslinker prepared by the invention is up to 350 seconds.