113results about How to "Reduce crosslinking" patented technology

A method for encapsulating biologics within a hydrogel by using an aqueous solution of an isocyanate-functional hydrogel prepolymer which is mixed with an amount of biologics and an aqueous solution containing a dithiol crosslinking agent under physiological pH conditions. An additional bidentate crosslinking agent may be included. The product of such method may be a bioreactor or an assay device having a plurality or different biologics encapsulated at predetermined locations in a substrate.

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 present invention provides a process to make a gelatine hydrolysate, a gelatine hydrolysate and gelatine compositions comprising gelatine hydrolysates. More specifically, the invention provides gelatine compositions having improved cross-linking and dissolution properties.

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 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.

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 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 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 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 present invention comprises methods and compositions for the reduction of oxalate in humans. For example, the invention provides methods and compositions for the delivery of one or more oxalate-reducing enzymes embedded in particle compositions. The compositions of the present invention are suitable in methods of treatment or prevention of oxalate-related conditions including, but not limited to, hyperoxaluria, absorptive hyperoxaluria, enteric hyperoxaluria, primary hyperoxaluria, idiopathic calcium oxalate kidney stone disease (urolithiasis), vulvodynia, oxalosis associated with end-stage renal disease, cardiac conductance disorders, inflammatory bowel disease, Crohn's disease, ulcerative colitis, and patients who have undergone gastrointestinal surgery and bariatric surgery (surgery for obesity), and / or who have undergone antibiotic treatment.