915results about How to "High viscoelasticity" patented technology

A continuous process for producing conjugated diene polymers comprising the steps of contacting, within an hydrocarbon solvent and within a continuous reactor, conjugated diene monomer and a catalyst composition prepared by combining: (a) a lanthanide compound, (b) an alkylating agent, and (c) a halogen-containing compound, and maintaining a non-ideal flow pattern within the continuous reactor so that 10% of the reagents entering the reactor at a reference time t0 are still present within the continuous reactor at a time t0+xtrt, where trt is the residence time corresponding to ideal flow within the continuous reactor and x is a numeral greater than 1.5.

The invention provides medium-temperature and high-temperature clean fracturing fluid used under high formation temperature and a preparation method thereof. The clean fracturing fluid contains Gemini cation surfactant, amphoteric surfactant, electrolyte salt, counter-ion salt, cosolvent and water. The clean fracturing fluid of the invention is used for oil and gas field fracturing and mainly comprises 2-5 percent of surfactant, 1-4 percent of amphoteric surfactant, 1-4 percent of electrolyte, 0.05-0.15 percent of counter ion and 0.1-1.5 percent of cosolvent by weight percent. Viscoelastic fluid is formed under agitation. The invention has the advantages that the viscoelasticity of the system is high, the friction resistance is low and good sand suspending performance is kept within 90-130 DEG C.

The invention provides in one form a macromonomer comprising a polysiloxane copolymer having a backbone structure derived from siloxane monomer units that are substituted or unsubstituted arylsiloxanes, arylalkylsiloxanes, alky(alkyl)siloxanes of the general formula —R1R2SiO— and wherein the terminal groups of the copolymer backbone include crosslinkable groups and wherein pendent from the backbone are at least two crosslinkable groups. The macromonomer may be cured in vivo by ultraviolet or visible light. The invention includes intraocular lenses formed by such macromonomers.

The invention relates to an acidic visco-elastic fluid, its preparation method and an application thereof. The fluid contains one or more cationic surfactants selected from a certain quaternary ammonium salt, a certain amine and a combination, one or more acids, one or more higher alcohols, one or more counter-ion salts, one or more corrosion inhibitors and water. The acidic visco-elastic fluid provided by the invention can be used for oilfield fracturing. On the application scene, each component is mixed and prepared into an aqueous solution of a certain mass percent; the aqueous solution isuniformly stirred and is punched together with a fracturing proppant into a well. The fracturing proppant in the fracturing fluid is uniformly dispersed and viscosity is broken completely.

The invention belongs to the field of water-soluble flooding polymer study, particularly relates to a high-molecular-weight heat-resistant salt-tolerate graft polyacrylamide synthesized with macromolecule monomer route. The preparation method of the heat-resistant salt-tolerate graft polyacrylamide comprises obtaining poly(N-vinyl pyrrolidone)acrylamide macromolecule monomer through chain transfer free radical polymerization and terminal group replacement; and copolymerizing the macromolecule monomer with acrylamide, N-vinyl pyrrolidone, N,N-dimethylacrylamide, 2-acrylamido-2-methylpropanesulfonic acid or other heat-resistant salt-tolerate monomer in the present of an oxidation-reduction composite initiation system to obtain target product. The invention ensures the heat-resistant salt-tolerate performance of the copolymer from molecular design, and the functional long graft side chain can increase the viscoelasticity of polymer modules and reduce solution surface tension. The inventive product is used for type III oil reservoir, and provides a possible solution for increasing recovery efficiency of chemical flooding.

The invention relates to a ceramic particulate and polymer composite having enhanced viscoelastic and rheological properties.

The invention relates to a three-phase foam complex oil flooding system and application thereof. The three-phase foam complex oil flooding system consists of a foaming agent, a foam stabilizer, water and gas, wherein the foaming agent and the foam stabilizer are uniformly dispersed into the water to form an oil flooding system solution; the proportion of components is as follows: the foam stabilizer is 0.1-0.3% in percentage by mass, and the foaming agent is 0.1-0.4% in percentage by mass; the gas is nitrogen, carbon dioxide or natural gas; the volume ratio between the oil flooding system solution and the gas is 1:(1-1.5), and the oil flooding system solution and the gas are alternately injected into the stratum or rock cores. The three-phase foam complex oil flooding system disclosed by the invention can be used for reducing the liquid discharge speed of a liquid membrane, increasing the viscoelasticity and strength of the liquid membrane, and ensuring that the foam is more stable, has good oil flooding effects, and can be used for enhancing the oil recovery.

The invention relates to a preparation method for low-density viscoelastic polyurethane foam. Based on 100 parts by weight of mixed polyether, Isocyanate reaction active ingredients include (biii) 70-95 percent of propylene epoxide, ethylene oxide copolymerized polyol or a compound thereof, wherein the oxygen ethylidene unit content is not less than 70 percent by weight, (biii) 5-30 percent of propylene epoxide, epoxy ethane copolymerized polyol or a compound thereof, wherein the oxygen ethylidene unit content is 20 percent by weight at most, and (biv) 0-15 percent of propylene epoxide, propylene epoxide copolymerized polyol or a compound thereof, wherein the oxygen ethylidene unit content is 20 percent by weight at most; a reaction system does not contain any toluene diisocynate component or foaming agents except water; at least two polyether polyols are taken as major polyethers; and low-density viscoelastic polyurethane foam with low odor and excellent fatigue resistance is prepared.

The invention provides chitosan-based double-network hydrogel. The hydrogel is of a double-network structure. A first network is chitosan graft hydrogel, and the chitosan graft hydrogel is formed by chitosan liquid, an initiator, a first single body and a cross-linking agent through grafting reaction. A second network is inserted inside the first network, and the second network is hydrogel which is formed by polymerization of a second single body, a cross-linking agent and a photo-initiator under the radiation of ultraviolet light and has high compression strength and tensile strength. Due to the introduction of chitosan, the biocompatibility of the hydrogel is improved. Thus, application of the double-network hydrogel in the fields such as biological medicine, the construction industry, the chemical industry and the mining industry is improved. The invention further provides a preparation method for preparing the chitosan-based double-network hydrogel. The method is simple in technology and enables industrialization to be easy.

A flowable aerated composition is provided which comprises hydrophobin and a yield stress agent, the composition having a continuous phase viscosity, measured at a shear rate of 10 s−1, of from 0.01 to 2000 Pa s, and a continuous phase apparent yield stress of at least 4 Pa.

To provide a resin composition that contains a solvent-soluble polyimide and can provide a film exhibiting high viscoelasticity and flexibility at high temperatures. To attain this, a polyimide resin composition is provided that includes a polyimide having a polycondensation unit of a tetracarboxylic acid dianhydride and a diamine, wherein the tetracarboxylic acid dianhydride includes an (α1) tetracarboxylic acid dianhydride represented by general formula (1), or the diamine includes an (β1) aromatic diamine represented by general formula (2), the diamine includes an (β2) aliphatic diamine represented by general formula (3) or (4), a total amour of the (α1) tetracarboxylic acid dianhydride and the (β1) aromatic diamine is 5 to 49 mol % with respect to a total amount of the tetracarboxylic acid dianhydride and the diamine, and an amine equivalent of the polyimide is 4,000 to 20,000.

The invention provides in one form a macromonomer comprising a polysiloxane copolymer having a backbone structure derived from siloxane monomer units that are substituted or unsubstituted arylsiloxanes, arylalkylsiloxanes, alky(alkyl)siloxanes of the general formula —R1R2SiO— and wherein the terminal groups of the copolymer backbone include crosslinkable groups and wherein pendent from the backbone are at least two crosslinkable groups. The macromonomer may be cured in vivo by ultraviolet or visible light. The invention includes intraocular lenses formed by such macromonomers.

The invention discloses a wound nursing dressing containing hyaluronic acid. The dressing comprises hyaluronic acid and salt thereof, and soluble silver salt effective ingredients, wherein the hyaluronic acid comprises high molecular weight hyaluronic acid and low molecular weight hyaluronic acid or oligomeric hyaluronic acid, wherein the high molecular weight hyaluronic acid is excellent in viscoelasticity, moisture retention and hydroscopicity, and the low molecular weight has a remarkable effect of promoting angiogenesis; the hyaluronic acids with two molecular weights both have multiple effects to wound healing, and have the effect of playing quick response and long action; and the soluble silver salt is stable in quality, has a good bacteriostatic effect, and plays a synergetic effect when being compounded with hyaluronic acids with high and low molecular weights. The dressing can be used for disinfection, anti-infection and healing acceleration of various skin wounds, ulcer and the like, and has a remarkable effect.

The invention relates to a preparation technique of crosslinked hyaluronic acid gel preparation, characterized in that divinylsulphone reacts with hydroxyl group of hyaluronic acid to form ether linkage. The steps are that the raw material of hyaluronic acid being put into container and dissolving in alkali reagent; stirring to make it thoroughly dissolve; mixing the alkaline hyaluronic acid solution and divinylsulphone in container to form crosslinked hyaluronic acid gel clot; adding substance riched in hydroxyl groups into the reaction solution; extracting the crosslinked hyaluronic acid gel clot and putting it into agitator to stir; and then crosslinked hyaluronic acid gel becoming micro grained. The advantages thereof are that the gel preparation is suitable for injection in vivo, with long residence timen in humans and good filling effect.

The invention belongs to the technical field of emulsion preparation, and discloses a stable-protein high-internal-phase oil-in-water emulsion and a preparation method thereof. The method comprises the following steps: a protein is dispersed into water, after the protein is fully hydrated, an aqueous phase protein solution is obtained, an oil phase is added, emulsification is performed, and therefore the stable-protein high-internal-phase oil-in-water emulsion is obtained. The method disclosed by the invention does not need any coagulants or surfactants, and the obtained high-internal-phase oil-in-water emulsion has good viscoelasticity, high heat stability and storage stability, and an excellent protection or controlled release effect on the oil phase; and the emulsion has good gelling performance, strong plasticity and remoldability, facilitates further processing, and has good application prospects in the fields of chemical products, daily chemicals, pharmaceuticals, food and healthcare products.

The invention relates to a high polymer chemically-modified asphalt composition and a preparation method thereof. The preparation method comprises the following steps: chemically modifying rubber, elastomer and base asphalt, and additionally matching stuffing and processing aids; premixing the materials by high polymer processing equipment to prepare the master batch of the modified asphalt; and fully dispersing the master batch into the asphalt by a high-speed shear mixer or by mechanical stirring. Or the modified asphalt material can be prepared by firstly pre-preparing a viscous liquid mixture of modified asphalt and then stirring and mixing the viscous liquid mixture of modified asphalt with the base asphalt. The modified asphalt material prepared by the invention has stable storage performance at high temperature, good performance at high temperature and low temperature, stable processing and preparation and simple and convenient method, and not only can be directly used in factory production but also can be used for road laying sites and in the construction of waterproofing materials.

The invention relates to a kind of high mineralization oil reservoir composite oil displacement agent comprising the following components by mass: 97.5%-99.9% of highly mineralized formation brine with the salt content of 32000mg / L-360000mg / L and the Ca2 + and Mg2 + content of being greater than 1000mg / L, 0-0.5% of xanthan gum, 0.1%-1% of a negative-non ampholytic surfactant and 0%-1% of a negative-positive ampholytic surfactant, and by use of the synergistic effect among metal monovalent and divalent cations, biological polymers and amphoteric surfactant molecules, the oil displacement agent not only has higher viscosity, low interfacial tension, and long-term stability, and can meet the requirements of great improvement of recovery efficiency, technical oil displacement system wave and volume enlargement, and improvement of oil displacement efficiency of a high mineralization oil reservoir.

The invention discloses hyaluronic acid-sodium alginate composite hydrogel and a preparation method thereof. The composite hydrogel is prepared from the following steps of: (1) dissolving hyaluronic acid and sodium alginate into water to obtain a solution 1; (2) adding a cross-linking agent to the solution 1, and regulating the pH value to be 4.0-5.5 with a buffer solution to obtain a solution 2; (3) adding a carboxyl activating agent to the solution 2 and stirring; and regulating and controlling the pH value of the solution 2 to be 2.0-5.5 in the stirring process until gel is formed to obtain the hyaluronic acid-sodium alginate composite hydrogenl. The invention provides a new approach for the modification of the hyaluronic acid, and the composite modified compound prepared by using the method has the advantages of higher mechanical property, capacity of resisting enzymatic degradation of the hyaluronic acid, biocompatibility, and the like and has potential application in the aspects of surgical operations and tissue engineering.

Improvements in the tensile mechanical properties and dynamic viscoelastic properties of silica-reinforced sulfur-vulcanized rubbers can be achieved by compounding elastomers with silica, in the presence of a silane and a catalytic amount of an alkyl tin compound at a high compounding temperature.

The invention discloses a long-branched chain polyacrylamide copolymer. The structural formula of the long-branched chain polyacrylamide copolymer is shown as formula (1). An organic silicon monomer with temperature resistance and salt resistance is introduced into an acrylamide copolymer so as to improve the temperature resistance and salt resistance of polyacrylamide; the introduction of a long-branched chain organic silicon flexible chain greatly improves the entwisting capability of a polymer molecular chain so as to improve the viscoelasticity of the polymer for reducing the interface tension of a grafting copolymer solution and improve the affinity of displacing fluid and displaced fluid in practical use; and a copolymer main chain is formed by copolymerizing the organic silicon monomer, acrylamide and monomers with temperature resistance and salt resistance, such as 2-acrylamino-2-methy propanesulfonic acid, N-vinyl pyrrolidone, N,N-dimethyl acrylyl and the like, thereby ensuring the chemical stability of the main chain.

The invention discloses a trivalent cation viscoelastic surfactant, and a preparation method and application thereof as well as clean fracturing fluid. An intermediate A is prepared by utilizing N,N'-dimethyl-1,3-dipropylene diamine and epichlorohydrin, the trivalent cation viscoelastic surfactant is prepared by the intermediate A and fatty acid amidopropyl dimethylamine, and the preparation process is simple. The clean fracturing fluid provided with the surfactant is excellent in temperature and shear resistance, strong in suspended sand performance, simple in field preparation, automatic ingel breaking, low in formation damage, low in cost and simple in preparation process as well as strong in temperature resistance, and the viscosity of the product can be maintained at 42 mPa.s under 170 s<-1> at a temperature of 180 DEG C after 80 minutes and is higher than the field construction requirements for the viscosity of the clean fracturing fluid (more than 25 mPa.s).

The invention discloses a preparation method of low-temperature resistant rosin thickening resin, which comprises the following steps of: under the protection of inert gas, melting rosin, and reaction the melted rosin with polyalcohol for 4-24h at the temperature of 200-290 DEG C under the action of catalyst; discharging to obtain polyalcohol modified abietate; and then, under the protection of inert gas, reacting the obtained polyalcohol modified abietate with higher fatty acid at the temperature of 200-290 DEG C for 4-24h, and discharging to obtain the rosin thickening resin; or under the protection of inert gas, melting the rosin, and then adding catalyst, the polyalcohol and the higher fatty acid into the melted rosin, carrying out reaction for 4-24h at the temperature of 200-290 DEG C, and discharging to obtain the rosin thickening resin. The rosin thickening resin prepared by the method is low in softening point and viscosity and higher in cold resistance. Meanwhile, the invention also discloses the low-temperature resistant rosin thickening resin prepared by the method disclosed by the invention, and the usage of the low-temperature resistant rosin thickening resin in preparation of a hot melt pressure sensitive adhesive.

An object of the present invention is to provide a transparent sheet which is excellent in transparency, and is also excellent in impact resistance and viscoelasticity, and a method for producing thereof. The transparent sheet of the present invention comprises a transparent flexible composition layer having 500 to 5,000 parts by mass of a liquid material (B) based on 100 parts by mass of a thermoplastic elastomer component (A) containing at least one elastomer (A-1) selected from the group consisting of a hydrogenated block polymer of a conjugated diene, a hydrogenated block copolymer of an aromatic vinyl compound and a conjugated diene, and an ethylene·α-olefin-based rubber, and other elastomer (A-2), and having a total transmittance of 90% or higher at 25° C. and at a thickness of 0.5 mm, and a transparent resin layer on surface of the transparent flexible composition layer. The present transparent sheet is obtained by laminating a transparent resin layer on the transparent flexible composition layer and put them on pressure as needed.

A process is provided by which a polyrotaxane including cyclic molecules having a relatively long graft chain is easily obtained. Also provided is a polyrotaxane which includes cyclic molecules having a radical polymerization initiation site and is for use as a raw material in the process. The polyrotaxane comprises: a pseudo-polyrotaxane comprising cyclic molecules clathrated with a linear molecule, the cavities of the cyclic molecules having been pierced by the linear molecule; and blocking groups disposed respectively at both ends of the pseudo-polyrotaxane so as not to release the cyclic molecules. The cyclic molecules in the polyrotaxane have a radical polymerization initiation site.

A method for increasing the recovering rate of crude oil includes preparing the mixed solution from polyacrylamide, foaming agent and water, and proportionally filling said mixed solution and gas or N2 in the water injecting well alternatively by the alternative period of 20 days.

A rubber composition containing 100 parts by weight of a diene-based rubber, 20 to 120 parts by weight of silica, a sulfur-containing silane coupling agent of 3 to 15% by weight, based upon the weight of the silica and a tertiary amine compound having the formula (I):wherein, R1 indicates a carbon atom or nitrogen atom and, when R1 is a carbon atom, R2 indicates a hydrogen atom or hydroxyl group andhaving a pKa value of 6.5 to 13.

The invention relates to a noise reduction PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) alloy material and a preparation method thereof. The alloy material comprises, by weight, 40-75 parts of polycarbonate resin, 15-55 parts of acrylonitrile-styrene-butadiene copolymer resin, 5-20 parts of high damping silicone rubber, 0.1-1 part of antioxidants and 0.1-1 part of lubricants. Raw materials are added into a mixer and mixed, obtained mixture is fed into a double-screw extruder through a weightless feeder and blended and granulated by the double-screw extruder to obtain the noise reduction PC / ABS alloy material. By the aid of the high damping silicone rubber, viscoelastic characteristics of PC / ABS alloys are improved, internal friction of macromolecular segments is caused by mechanical energy of noise when plastic products have noise risks, so that the mechanical energy is converted into heat energy to be dissipated, the noise risks of the plastic products are reduced, and noise can be reduced. Besides, the impact toughness of the PC / ABS alloys is improved by the high damping silicone rubber serving as a toughening agent.

The invention belongs to the technical field of building materials, and specifically relates to a compound foaming agent for a foam concrete and the preparation method of the compound foaming agent. The compound foaming agent is composed of a surfactant, a protein foaming agent, a foam stabilizing agent, a coagulation accelerator and a water reducing agent. The compound foaming agent provided by the invention is doped with few protein foaming agent and foam stabilizing agent in a surfactant solution to remarkably improve the foaming capability and the foam stabilizing time of the surfactant solution and create favorable conditions for preparing the foam concrete at a low-density grade (not more than 500 Kg / m<3>). In addition, the coagulation accelerator is doped to accelerate the condensation of cement slurry and effectively prevent collapsing; the water reducing agent is doped to improve the working property of a freshly mixed concrete, and reduce the water dosage and improve the strength of the foam concrete at the same time. The product provided by the invention has various functions, and is not limited to only prepare the foam; at the same time, the product provided by the invention has the actions of accelerating coagulation and reducing water, and the product provided by the invention is suitable for preparing the low-density foam concrete.

Compositions, formulations, and methods for the treatment or prevention, or decreasing the frequency of transmission of a virus (such as human immunodeficiency virus type 1 (HIV-1), Herpes Simplex virus type 1 (HSV1), or Herpes Simplex Virus Type 2 (HSV2), or other virus), or a bacterial infection (such as Trichomonas vaginalis, Neisseris gonorrhoeae Haemopholus ducreyl, or Chlamydia trachomatis, or other bacterial species), or a fungal infection, using an anionic cellulose- or acrylic-based oligomer, polymer, or copolymer. The present invention also includes administering a therapeutically effective amount of said oligomer, polymer, or copolymer, or a pharmaceutically acceptable salt thereof, or with a pharmaceutically acceptable carrier or diluent, thereof. The invention relies on the unique biochemical substitution of the cellulose or acrylic backbone such that the resultant molecule can remain molecularly dispersed in solution (or gel or other formulation) and mostly dissociated over a wide range of physiological microenvironments, such as the low pH found within the vaginal lumen, preferably from a pH of 14 to below 3.5. These specific substitutions also impart on the resultant molecule potent antiviral, anti-bacterial, and anti-fungal properties. In addition, these compositions can be used as general disinfectants for human use such as in contact lens solutions, mouthwashes, toothpastes, suppositories, or as more generalized disinfectants found in soaps, household cleaning products, paints, water treatments modalities, or can be incorporated into cosmetic, and can be used as vehicles for drug delivery, an adjuvant in a therapeutic formulation, or as a preservative. These compounds can be delivered in a liquid or solid dosage form and can be incorporated into barrier devices such as condoms, diaphragms, or cervical caps, to help prevent the transmission of STDs. The compounds of this invention can also be used in combination therapies with other classes of antiviral, antibacterial, or antifungal agent having similar or differing mechanisms of action including, but not limited to, anionic or cationic polymers, copolymers, or oligomers, surfactants, protease inhibitors, DNA or RNA polymerase inhibitors (including reverse transcriptase inhibitors), fusion inhibitors, cell wall biosynthesis inhibitors, integrase inhibitors, or virus or bacterial attachment inhibitors.

The invention relates to a gel hemostatic material and a preparation method thereof. The gel hemostatic material achieves the effect of blocking hemostasis in such a way that a nucleophilic polymer and an amino acid oligomer are in cross-linking reaction with an electrophile polymer to generate a three-dimensional polymer in situ. A gel hemostatic material composition and a preparation method thereof have the advantages that the raw material ratio is controlled accurately, the reasonable gel forming time can be achieved, the gel forming time is less than 10 seconds, the expected strength is relatively high, and the testing result shows that the elongation at break of the biologic gel hemostatic material is 300-600 percent, and the compression strength of the biologic gel hemostatic material is larger than 3 Mpa; the requirement of surgical operation can be met well.