204results about How to "Short gel time" patented technology

Embodiments of the present invention describe a method for producing gel beads comprising: depositing catalyzed sol droplets comprising a gel precursor into a moving dispensing medium, said medium being immiscible with the sol, and allowing gelation of the sol to occur in the moving dispensing medium thereby producing gel beads. This system utilizes a horizontally flowing dispensing medium where the catalyzed sol droplet is fully formed before deposited therein.

The invention relates to a spraying quick-setting rubber asphalt waterproof coating material. A special technology is adopted for preparation of the spraying quick-setting rubber asphalt waterproof coating material. The spraying quick-setting rubber asphalt waterproof coating material is a water-based spraying paint prepared according to a ratio, and a preparation method of the spraying quick-setting rubber asphalt waterproof coating material comprises following steps: a liquid rubber asphalt latex emulsion is prepared by mixing superfine, suspended and micro-emulsion modified emulsified asphalt with high-molecular polymer rubber latex; and the liquid rubber asphalt latex emulsion is mixed with a coagulant. Cold spraying construction is adopted for preparation of the spraying quick-setting rubber asphalt waterproof coating material; elastic coating film elongation is more than 1000%; restoration ratio is more than 95%. The spraying quick-setting rubber asphalt waterproof coating material possesses ultraviolet resistance, high construction efficiency, high bonding strength, excellent high-temperature resistance, excellent low temperature flexibility, and better quick setting effect; and is capable of forming films in 3 seconds. The spraying quick-setting rubber asphalt waterproof coating material is water based; is friendly to the environment; possesses no toxicity, and excellent endurance; is quick and convenient for construction; and is a novel environmental friendly waterproof paint with a wide application range. The spraying quick-setting rubber asphalt waterproof coating material is mainly used for various waterproof and anticorrosion projects. The spraying quick-setting rubber asphalt waterproof coating material is used for individual construction of waterproof projects, for composite construction of waterproof projects together with waterproof roll, and for individual construction of anticorrosion projects.

The invention relates to medical adhesives and a preparation method thereof. The adhesives are prepared from aldehyde sodium alginate and amination carboxymethyl chitosan. The preparation method includes the steps of mixing equal volumes of aldehyde sodium alginate solution with concentration of 10-50 wt% and amination carboxymethyl chitosan solution with concentration of 1-6 wt%, conducting a Schiff base reaction to form hydrogel, and obtaining the medical adhesives. Selected aldehyde sodium alginate and amination carboxymethyl chitosan are both natural biological materials, are free of toxin and odor, quite high in biological compatibility, low in price, safe, reliable, capable of being locally sprayed or injected to any part of a body in situ and low in cost, and is ideal substitute goods for fibrin glue sold on the market. The preparation method is simple.

The invention discloses an antibacterial adhesion injectable hydrogel dressing, a preparation method and applications thereof, and belongs to the technical field of biodegradable biomedical materials.According to the method, 2,3-epoxypropyltrimethylammonium chloride (GTMAC) is grafted onto chitosan to obtain a quaternized chitosan polymer (QCS) as the main raw material of a hydrogel, p-carboxybenzaldehyde is grafted onto a triblock copolymer Pluronic< >F127 to obtain an aldehyde group-terminated Pluronic< >F127 polymer (PF127-CHO) as the cross-linking agent of the gel, and the aldehyde group-terminated Pluronic< >F127 polymer (PF127-CHO) and the quaternized chitosan polymer (QCS) are subjected to a cross-linking reaction under a physiological environment to obtain the antibacterial adhesion injectable hydrogel dressing (QCS/PF) with advantages of rapid self-healing, easy extending and easy compression. According to the present invention, the method has advantages of simple process, wide raw material source and low preparation cost; and the hydrogel dressing prepared by using the method has advantages of good adhesion, good pH responsiveness, good mechanical property, good self-healing property, good bleeding stopping property and good antibacterial property so as to be used in the field of skin injury treatment drugs.

The invention relates to chemical crosslinking type glucan hydrogel and a preparation method thereof, and belongs to the technical field of biomedical functional polymer materials. The preparation method comprises the steps that glucan is dissolved in water at room temperature and then placed in an ice-water bath, and sodium periodate is added to obtain a mixed solution; the mixed solution is stirred for reaction for 2-6 h on the room temperature and dark conditions; the stirred solution is dialyzed with a regenerated cellulose dialysis bag in deionized water, and after dialysis is completed, freeze drying is performed to obtain partial hydroformylation glucan solids with the hydroformylation degree of 40-60 percent; the obtained partial hydroformylation glucan solids are dissolved in the deionized water to obtain an aqueous hydroformylation glucan solution, a multi-amino crosslinking agent is added in the aqueous hydroformylation glucan solution to be mixed evenly at the room temperature, and then the glucan hydrogel is prepared. The chemical crosslinking type glucan hydrogel is prepared by taking natural glucan macromolecules with the good biosafety as a material basis through chemical crosslinking of the partial hydroformylation glucan and the multi-amino crosslinking agent.

The invention discloses a method for preparing preparing silicon dioxide aerogel powder, which comprises the following steps: adding acid into sodium silicate solution to make a pH value equal to 3 to 6; adding a chemical drying control agent into mixture and standing to form gel; after the gel is sufficiently aged, adding an azeotropic distillation organic solvent into the gel to distill to form a primary dried product; and drying the primary dried product to form silicon dioxide aerogel powder. The method uses the common commercial sodium silicate as the raw material to prepare the silicon dioxide aerogel powder and has the advantages that the raw material is easily obtained; the normal pressure is used for preparation; the chemical drying control agent is adopted to prolong the gelation time to promote uniformity of the gel structure; an azeotropic distillation drying process is adopted to control a stress level when the solvent is dried; a pore volume and a specific surface area of the silicon dioxide aerogel are controlled; the pore volume reaches 1.2 to 3.0ml/g; the specific surface area reaches 300m2/g to 800m2/g; and compared with the normal pressure drying, the drying time is shortened and the like. The organic solvent is easy to realize recycling. And the production process is simple and the production cost is low.

A method for treating a subterranean formation penetrated by a wellbore that includes injecting an alkali silicate into the wellbore; injecting a solid micronized silicate-precipitating agent into the wellbore; and allowing the alkali silicate and the solid micronized silicate-precipitating agent to react to form a silicate gel is disclosed.

The invention discloses a preparation method for silk fibroin composite gel. The preparation method comprises the following steps: conducting a dissolution treatment on silk fibroin obtained by degumming in a LiBr solution; preparing a regenerated fibroin solution through dialysis; mixing the regenerated fibroin solution with Gamma- polyglutamic acid; finally, preparing the silk fibroin composite gel under the action of a cross linking agent. The preparation method is simple in technology and short in the gelation time; the efficiency is greatly improved; the required amount of the cross linking agent is small; the safety is strong; the prepared silk fibroin composite gel is degradable and has relatively high mechanical property and stronger water absorbability, so that the silk fibroin composite gel is superior to silk fibroin composite gel prepared from other methods. The silk fibroin composite gel can be used for the fields of medicine and health, tissue engineering, environmental protection and the like; the application of the silk fibroin composite gel is broadened and a novel thought and a novel method of preparing high-strength silk fibroin composite gel are provided.

The invention belongs to the technical field of polymer materials and relates to thermoplastic polyurethane and its preparation method. The thermoplastic polyurethane comprises the following components by weight: 20 to 50 parts of polyether polyol, 45 to 65 parts of diisocyanate and 5 to 20 parts of a chain extender. According to the invention, the one-step method is adopted for preparation of the thermoplastic polyurethane, polyol with low molecular weight or a compound of polyols with high molecular weight and low molecular weight, diisocyanate with different structures and the chain extender are employed, so the thermoplastic polyurethane with high hardness and high toughness is prepared.

The invention relates to a low dielectric constant polyhedral oligomeric silsesquioxane (POSS)/ epoxy resin hybrid material and a preparation method. Epoxy resin and eight epoxy group polyhedral oligomeric silsesquioxane (G-POSS) are evenly mixed in a 80 DEG C breaker according to a certain proportion, an equivalent amount of curing agent triethylene tetramine (TETA) (an amino group in the TETA and an epoxy group in the G-POSS, epoxy resin (EP) are measured according to a 1:1 molar rate) is added and fully stirred, after vacuum defoamation is conducted for 20-30 minutes, the mixture is slowly poured into a preheating mold, conducted solidification in a stove 50 DEG C/ 2 hours, 70 DEG C/ 3 hours and 80DEG C/ 1 hour, cooled to room temperature along with the stove and processed for 4-6 hours after demolding. The low dielectric constant POSS/ epoxy resin hybrid material is small in average grain size and excellent in transparent performance, mechanical property and dielectric property.

The invention belongs to a rigid spray polyurea protective material for steel structure anticorrosion and discloses rapidly cured rigid polyurea with high adhesion. The rapidly cured polyurea comprises double components, wherein the component A comprises raw materials in percentage by mass as follows: 50%-70% of isocyanate, 30%-40% of polyether polyol and 6%-10% of auxiliaries; the component B comprises raw materials in percentage by mass as follows: 20%-40% of a chain extender, 30%-60% of polyether polyol, 0-0.5% of a catalyst, 0-1% of color paste, 0-10% of pigments and filler and 0-10% of auxiliaries. The rigid polyurea improves the defects of cracks and high brittleness of a polyurea coating with high NCO content, has higher impact resistance and belongs to rapidly cured and quick-drying type polyurea materials, the construction period can be shortened, and the construction efficiency can be improved effectively. The crosslinking density and the rigidity of polyurea are improved, the adhesion of polyurea on a steel stature reaches 15 MPa, the cathodic disbanding diameter is smaller than 3 mm, the polyurea is applicable to various working condition environments due to high performance, and the application field is broadened.

The invention provides a conductive photo-thermal self-healing composite hydrogel dressing as well as a preparation method and application thereof.The preparation method comprises the following steps:grafting acrylic acid on chitosan to obtain an N-carboxyethyl chitosan polymer; the preparation method comprises the following steps: grafting p-hydroxybenzaldehyde on a triblock copolymer to obtainan aldehyde-terminated polymer (PF127-CHO); the preparation method comprises the following steps: preparing an aldehyde-terminated polymer into a solution, adding carbon nanotubes into the polymer solution, and carrying out ultrasonic treatment in an ice bath to obtain an aldehyde-terminated/carbon nanotube dispersion liquid; the preparation method comprises the following steps: preparing an N-carboxyethyl chitosan polymer into a solution, mixing the solution with an aldehyde group-terminated/carbon nanotube dispersion liquid, and carrying out mutual crosslinking at 20-45 DEG C for 5-400 seconds to obtain the conductive, adhesive, self-healing, photo-thermal and nano composite hydrogel. The hydrogel has excellent adhesion, self-healing, pH response, biocompatibility and hemostatic performance, can show a photo-thermal behavior after being exposed to a near-infrared (NIR) region, causes physical damage to bacteria, and has huge potential for treating infected wounds.

The invention discloses a nano-composite energetic material. The nano-composite energetic material is prepared through the steps that CL-20 and NC are taken as raw materials and then dissolved in weak-polar solvent according to the mass ratio (0.1-3):1 of the CL-20 to the NC to be prepared into a transparent solution, an isocyanate curing agent and a composite catalyst of T-12 and TEDA are added to form wet gel, the solvent is removed through supercritical drying after the wet gel is aged, and then the aerogel-state nano-composite energetic material is obtained. The prepared composite energetic material has the nano-structure, is higher in energy and activity and lower in sensitivity, has the good prospect on the aspects of improving the security feature and energy releasing efficiency of energetic components and the like and can be applied to the fields of high-energy density materials such as solid propellants, explosives and powders and pyrotechnic compositions.

A polyurea coating for spraying it on the surface of solid float material is composed of semi-prepolymer A and multi-component amine mixture R through proportional mixing. Said component A consists of polyisocyanate and polyether polyol. Said component R comprises amine-type chain extending agent, amino-terminated polyether and assistant.

The invention discloses an ammonia-free gel. The ammonia-free gel is rapidly prepared by adding, by weight, 10 to 20 parts of water and 2 parts of sodium silicate into 1 part of a powder agent, and is used for fire prevention. The powder agent is composed of following ingredients, by weight, 30% of sodium bicarbonate, 20% of magnesium sulfate, 40% of copper sulphate, 5% of cellulose, 3% of bentonite, and 2% of a thickening agent. The thickening agent is a cellulose thickening agent; and reaction is carried out at normal temperature. It is confirmed by experiment research and cost analysis that, compared with conventional gel in the market, a preparation method of the ammonia-free gel is simple; gelation time is shorter; raw materials are easily available; water retaining rate is high; the ammonia-free gel is friendly to the environment, is nontoxic, is harmless, is odorless, possesses no corrosivity, and improved fire resistance and heat stability, and can be commonly used for coal mine fire extinguishing.

Aiming at underwater structures (such as underwater cave depots) and ships, the invention provides an underwater anti-impact coating with a rapid curing function. The underwater anti-impact coating with the rapid curing function comprises a component A and a component B, wherein the component A is prepared through steps as follows: polyether polyol is heated to 120 DEG C, subjected to vacuum dehydration and cooled to the room temperature, the measured amount of isocyanate is dropwise added, a reaction is performed at the temperature of 80-120 DEG C, vacuum degassing is performed, and a product is cooled to the room temperature, barreled and sealed; the component B is prepared through steps as follows: amine-terminated polyether, a diamine chain extender, a pentaerythrityl tetramine derivative and an auxiliary are mixed uniformly, filler is added for grinding, and all components are stirred uniformly. The prepared anti-impact coating can be cured in 5-15 s and is waterproof and aging-resistant, particularly, an attached substance is endowed with excellent anti-impact capacity, and after spraying of the anti-impact coating, the anti-impact capacity of the cave depots and the ships to underwater explosives is greatly enhanced.

The invention belongs to the technical field of molding and manufacturing processes for transparent ceramic, and specifically relates to a method for preparing YAG transparent ceramic by gel casting.The method uses Isobam as a dispersing agent and a gelating agent, and adopts a system selected from the group consisting of a Ziegler-Natta catalyst system (a Ziegler-Natta catalyst), an ammonium persulfate-tetramethylethylenediamine (APS-TEMED) catalytic system and a 2,2-azo[2-(2-imidazoline-2-yl)propane]hydrochloride (AZIP.2HCl) catalytic system to control the rate of gelation and control the time of gel casting.

A process for obtaining aqueous compositions including curing epoxy agents includes providing an aqueous mixture comprising at least one polymercaptan, at least one di- or poly(amido)amine, and water, and reacting the aqueous mixture with an uncured epoxy resin to form a final cured epoxy resin is provided. A process for obtaining aqueous compositions including curing epoxy agents includes providing an aqueous mixture of at least one waterpoxy treated with at least one polymercaptan, and reacting the aqueous mixture with an uncured epoxy resin to form the final cured epoxy resin is also provided.

The invention discloses an underground pipeline protection device and a support method applying the underground pipeline protection device. The device is formed by mutually buckling a plurality of pieces of channel steel, and the directions of adjacent channel steel openings are opposite; grouting steel tubes are welded in the channel steel; grouting holes are formed in the walls of the grouting steel tubes. The underground pipeline protection device has the beneficial effects that channel steel which is tightly buckled and closely lined in forward and reverse directions is horizontally deployed below a pipeline; the grouting steel tubes are welded in the slots of the channel steel; the soil is consolidated and gaps between the channel steel can be compacted through the grouting of the grouting steel tubes, so as to effectively isolate the pipeline from the vault of a tunnel and prevent the phenomena of pipeline damage, tunnel gushing and the like due to the collapse and sinking of soil on the vault, so that the safety factor is high; in addition, according to the support method, no special robot is needed for construction, a worker only needs to set the channel steel and grout, a construction method is simple, the reinforcing effect is significant, and the time of the worker is saved.

The invention relates to a curing agent for epoxy resin and an epoxy adhesive used at ultralow temperature and prepared from the curing agent. The curing agent is an oligomer prepared by decyclization and deamination of a molecular structure as shown in the description and condensation of FZ-201 compound alicyclic amine and thiourea under the action of diethylene glycol, wherein FZ-201 compound alicyclic amine is dimethylcyolohexlemine, dimethylcyclopentylamine and N-aminoethylpiperazine; the weight part ratio of FZ-201 compound alicyclic amine to thiourea to diethylene glycol is 100:25:20; the epoxy adhesive used at ultralow temperature comprises epoxy resin and the curing agent which are in the weight part ratio of 95:(15-35); and the epoxy resin is bisphenol A glycidyl ether epoxy resin E-51 with bifunctionality. The open-loop alicyclic amine with a molecular structure as shown in the description is used as the curing agent, the molecular structure not only contains amino groups, but also contains the molecular structure as shown in the description, and the crosslinking density of the epoxy adhesive is lower than that of an epoxy resin adhesive of an alicyclic fatty amine curing agent only containing amino groups, so that the defect of high brittleness of a cured product is overcome, and the epoxy adhesive is high in toughness, suitable for use in an ultralow-temperature environment, simple in preparation process as well as cheap and available in raw materials.

The invention belongs to karst stratum reinforcement and water blocking technique in tunnel and underground construction. The quick gelling, micro expansion and high strength type injecting grout material is prepared from P.O42.5 cement, and calcium lignosulphonate, soda and calcium sulphoaluminate expanding agent (specially for grout injection) of which the weight percentages account for the weight of the cement are 0.4 percent, 0.4 percent and 8 percent respectively, and the water cement ratio of the grout is as follows: W/C is equal to 1.2 to 1. The injecting grout material prepared by the invention has characteristics of quick gelling, micro expansion and high strength, a plurality of experiments and site tests in tunnel underground construction show that the injecting grout material has relatively ideal gelling time and water blocking reinforcement and seepage preventing effects.

The invention discloses a construction method for disposing road cracks by using waterborne polyurethane. The method comprises the following steps: carrying out nondestructive testing on road cracks, drawing a crack distribution diagram, cutting and slotting cracks with the width of less than 3mm as required, drilling grouting holes at intervals along the trend of the cracks, installing grouting pipes, injecting water into the cracks; and then injecting a waterborne polyurethane grouting material, enabling the slurry to react with water in the cracks to generate gel to fill the cracks, sealing the grouting holes after grouting is completed, and finally performing rechecking to confirm that repairing is completed. The method has the advantages that visual detection of road cracks can be achieved, follow-up grouting repair is effectively guided, the characteristics that the waterborne polyurethane material is high in water reaction speed and short in gelation time are ingeniously utilized, roadbed and pavement cracks can be rapidly and comprehensively repaired, the material cannot generate a corrosion effect. And the road crack disease is effectively solved, and wide applicability is achieved.