189results about How to "High molecular weight" patented technology

An electrode assembly for iontophoresis may enable the administration of a non-ionic active agent ionized, or an active agent that is substantially insoluble in water, by iontophoresis. An electrode assembly used for iontophoresis may hold an active agent enclosed in an ionic nanoparticle.

A multimodal polyethylene composition having at least two polyethylene components, wherein each component has a molecular weight distribution of equal to or less than about 5, one component has a higher molecular weight than the other component, and the higher molecular weight component has an “a” parameter value of equal to or greater than about 0.35 when fitted to the Carreau-Yasuda equation with n=0.

The invention relates to the synthesis of siloxane polymers containing self-complementary quadruple hydrogen bonding groups (4H-units). The resulting polymers show unique new characteristics that result from the reversible, physical interactions between the polysiloxane chains that are based on the (supramolecular) interactions between the 4H-units. The polysiloxanes in this invention show unprecedented bulk material properties and are used as gelling agents for silicone fluids. The resulting gels are clear and display good material properties, while having unparalleled high silicone fluid contents.

A wrought fiber sheet or air cleaning filter unit that exhibits high performance and is biodegradable so as to enable reducing load upon environment. The wrought fiber sheet is produced by coupling biodegradable fiber sheets having electret properties by means of a configuration reinforcing member of a biodegradable material. Further, the frame for accommodating the wrought fiber sheet is also constituted of a biodegradable member so as to obtain an air cleaning filter unit that exerts biodegradability as a whole.

The invention discloses a method for preparing intelligent stress responding type silicon-boron polymer microgel, comprising the following steps of: stirring a prepolymerization reaction solution at 70-130 DEG C to react for 1-6h, continuously stirring after adding a bifunctional chain extender to react at 30-90 DEG C for 2-6h, and finally stirring after adding a functional modifier to react at 30-120 DEG C for 4-8h, to obtain the intelligent stress responding type silicon-boron polymer microgel. The prepolymerization reaction solution comprises: 75.0-96.5 wt. % low molecular weight polydiorganosiloxane, and 3.50-25.0 wt. % of boron-containing compound. The method for preparing the intelligent stress responding type silicon-boron polymer microgel has advantages of low reaction temperature and easy operation, has no need to introduce a catalyst, and is in favor of large scale production.

The invention discloses a cation type hydrophobic association polymer and a preparation method and application thereof. Through adopting acrylamide, dimethyl diallyl ammonium chloride and butyl acrylate as synthesis monomer, the cation type hydrophobic association polymer is made through a common free radical micelle polymerization method and making use of a composite initiation system and additive auxiliary agent urea. Moreover, the cation type hydrophobic association polymer, which has the characteristics of high molecular weight, excellent product stability, strong adsorption bridging capacity of colloid matter, good flocculation effect, wide application scope, less generated sludge and hydrophobic association function, etc., can be widely used in the treatment of oil field oily wastewater.

The invention relates to a method for synthesizing high-activity high molecular weight polyether polyol, belong to the field of chemical industry. The invention solves the technical problem of providing a method for synthesizing high-activity high molecular weight polyether polyol with uniform and transparent appearance. The invention has the technical scheme that the method for synthesizing high-activity high molecular weight polyether polyol comprises the following steps of: adopting a polyol compound as an initiating agent, adding a catalyst and an epoxy compound into a reaction system by steps for multiple times at the pressure of 0.1-0.5 MPa and the temperature of 60-140 DEG C, and carrying out polymerization in a high-speed stirring device. The polyether polyol prepared by using the method provided by the invention has high molecular weight, regular distribution and relatively low viscosity. Compared with general soft-foam high elastic polyether polyol on the market, the polyether polyol has higher molecular weight, higher reaction activity and more regular molecular weight distribution.

This invention relates to arylether-nitrile copolymer with isobenyl units. This invention can facilitate easy breakage of structural symmetry, easy control over the synthesis process, and easy increase of the product molecular weight by copolymerization reaction. This invention can control the structure and properties of the product by adjusting the ratio of resocin to the other dihydric phenol as well as its variety. This method can change the mechanical and thermal properties of the copolymer by changing the variety of the dihydric phenol, and improve the mechanical and thermal properties by increasing the amount of the dihydric phenol. This invention has such advantages as low raw material cost, abundant raw materials, low product price, high cost performance, and wide applications.

The invention discloses a preparation method of a demulsifier for oil fields. In the method, fatty alcohol is used as a raw material, and the demulsifier is prepared by crosslinking and modifying after reacting the fatty alcohol with oxirane and epoxypropane. First, the fatty alcohol is used as an initiator, and a polyether demulsifier A is prepared by reacting the fatty alcohol with propylene oxide and ethylene oxide in the presence of a basic catalyst. Then, a product B is prepared by carrying out self-crosslinking reaction on the polyether demulsifier A with polycarboxylic acid under the action of the catalyst. Finally, a final product, i.e. the high-performance demulsifier, is prepared by carrying out self-crosslinking reaction on the polyether demulsifier A and the product B in a solvent with adoption of toluene diisocynate. The demulsifier prepared with the method has the advantages of high relative molecular weight, ideal dewatering effect and good broad spectrum property, and can be used for demulsifying and dewatering oil field crude oil. Separated water is clear, and the use amount of the demulsifier is small.

The invention discloses a polyimide gas separation membrane with high molecular weight and a preparation method thereof, the polyimide gas separation membrane consists of aromatic diamine and aromatic dianhydride, a polar solvent is used for matching, and the polyimide gas separation membrane with the high molecular weight is prepared by the technological steps of preparing polyamic acid solution, preparing a polyimide membrane and stripping the polyimide membrane, thereby preparing the polyimide gas separation membrane with the high molecular weight. The polyimide gas separation membrane has the advantages of strong solubility, high molecular weight, good permeability, stable performances, good membrane-forming property, easy processing and molding, simple preparation technology, low cost and easy industrialization, and can be extensively applied in CO2/CH4 and CO2/H2 separation in petroleum and natural gas and be suitable for popularization.

A composite flocculant in the form of brown liquid is a homo-polymer poly-iron-dimethyl dially ammonium chloride consisting of iron (5.5-8.0 Wt%) and poly-dimethyldially ammonium chloride (3-16 Wt%). Its preparing process featuring the addition of PDMDAAC to PFC solution is also disclosed. Its advantages are high flocculating effect and stability and low cost.

The present invention relates to a novel process of preparing branched polymers by cyclotrimerization and branched organic materials containing triaroylbenzene moieties as base structural unit. The polymerization is a simple one-pot reaction, strictly regioselective and highly functionality-tolerant giving oligomeric and polymeric polymers with high degree of branching (up to 100%) in high yields (up to 99%). The polymers are processible, easily film-forming, transformable (curable) into thermosets by heat or irradiation, and readily crosslinkable by UV irradiation to give patterns with nanometer resolution. The polymers of the present invention can be blend with a variety of macromolecules for general use. The polymers can be metallified utilizing organometallic acetylene as building blocks and ceramization of the patterns of the obtained polymers afford ferromagnetic ceramic patterns with high resolution.

The invention belongs to the technology in the preparation field of completely biodegradable fat-aromatic copolyester and in particular relates to a preparation method of polyadipic acid-butylene terephthalate with high molecular weight. The preparation method comprises the following steps of: adding butanediol, adipic acid and terephthalic acid into a reactor; adding a composite catalyst to the reactor for carrying out esterification reaction; and carrying out polycondensation to obtain a product, wherein the composite catalyst is a mixture of metal oxide and titanium organic esters, and the metal oxide is at least one of oxides of Li, Na, K, Mg, Al, Ca, Mn and Co. The composite catalyst is adopted, so that the catalytic efficiency is high, the polymerization reaction velocity is greatly increased and the cost of the product is technically reduced. A stabilizer is added during the polycondensation stage, so that the high-temperature degradation side reaction is reduced, the molecular weight of the polymer is improved, the product color phase is improved, the terminal carboxyl content of the polymer is effectively reduced, the post-processing heat resistant performance of the product is improved, and the using value is greater.

The invention belongs to the field of high polymer materials and particularly relates to an environment-friendly polyurethane water shutoff material. The environment-friendly polyurethane water shutoff material is prepared from a polyurethane prepolymer and an additive, wherein the polyurethane prepolymer is prepared from the following raw materials: polyethylene-polypropylene glycol a (functionality: 3-4 and hydroxyl value: 300-500), polyethylene-polypropylene glycol b (functionality: 2-3 and hydroxyl value: 200-400), polyethylene-polypropylene glycol c (functionality: 2-3 and hydroxyl value: 100-200), a water remover and isocyanate; the additive is prepared from the following raw materials: a plasticizing agent, a diluent, a flame retardant, a catalyst and a surfactant. When being injected to a hole or crack, the polyurethane water shutoff material is diffused and solidified in the crack to generate foam with certain strength; molecules of a gel contain a great number of polar groups, so that the environment-friendly polyurethane water shutoff material is high in bonding strength and capable of shutting off the crack, thus playing the water shutoff and consolidation effects. The invention also provides a preparation method of the environment-friendly polyurethane water shutoff material. The preparation method is reasonable in process and easy for industrial production.

The invention discloses a hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent. The hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent is characterized by being obtained by carrying out hydrolysis reaction onto graft carboxymethyl cellulose under alkali condition, wherein the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent has the structure shown in the specification; the mass of polyacrylamide is 5%-65% of that of the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent; and the mass of the polyacrylic acid is 5%-70% of the that of the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent. The hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent disclosed by the invention has the triple characteristic of carboxymethyl anionic group, polyacrylamide and polyacrylic acid. Moreover, the carboxymethyl anionic group, polyacrylamide and polyacrylic acid are linked by chemical bonds, so that the molecular weight of carboxymethyl cellulose is improved and the bonding and bridging flocculation is enhanced. Besides, the soluble pH range of the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent is expanded due to the existence of the grafting chain, and therefore, the pH sensitivity of the flocculation effect of carboxymethyl cellulose is effectively restrained.

In a continuous two-stage process for preparing solvent-free polyacrylate hotmelt pressure sensitive adhesives which is gentle on the polymer and redeploys the solvent used in the process the following steps are carried out:

• • polymerizing a self-adhesive pressure sensitive adhesive in solution, the solvent having a low vapor pressure;
  • continuously mixing the polymer solution with antioxidants and preheating the mixture under superatmospheric pressure without boiling it;
  • concentrating the polymer solution to a residual solvent content of less than 0.1% by weight in a concentrating extruder under the effect of reduced pressure and elevated temperatures;
  • condensing, collecting, and re-using the solvent stripped off in the extruder;
  • compounding the abovementioned solvent-freed hotmelt pressure sensitive adhesive with tackifying resins, fillers, stabilizers, crosslinkers or other additives in a second extruder at a moderate melt temperature;
  • transferring the blended solvent-free self-adhesive pressure sensitive adhesive to a downstream coating unit.

The invention relates to a crosslinking modification method of azo-disperse dye. The method comprises the steps of: adding a proper amount of disperse dye parent which is subjected to purification and vacuum drying into a flask equipped with a reflux device, adding an organic solvent which is subjected to dehydration treatment as a reaction solvent, stirring to dissolve the disperse dye parent, adding an organic tin type catalyst, gradually heating to 80-95 DEG C, precisely weighing a crosslinking agent, dissolving and diluting with a proper amount of reaction solvent, slowly dropping into a reactor within 60-90min, performing heat preservation reaction for 2-4h, stopping heating and cooling to room temperature; performing purification and separation through adding the reaction solvent and filtering to obtain a product. With the method, the phenomenon that the color fastness is poor because dye molecules of the current novel hydrophobic fiber disperse dye are easy to migrate in dyeing is improved, and washing fastness and resistance to dry heat of disperse dye obtained by crosslinking modification in spandex dyeing are greatly improved.

The invention relates to a preparation method of a temperature-resistant anti-salt anti-shearing nano-polymer. The nano-polymer is obtained by adopting an emulsion polymerization method, and taking water as a solvent, sodium dodecyl sulfate as an emulsifying agent, an ammonium sulfate and tetramethylethylenediamine redox system as an initiating agent, and multi-vinyl modified nano silicon dioxide as a core to copolymerize with monomer acrylamide and 2-acrylamide-2-methylacrylsulfonate at certain temperature and pH value. The synthetic reaction is mild in condition, easily-available in raw material, low in cost, high in monomer conversion rate and convenient in product treatment, and the obtained nano polymer has good temperature resistance, salt resistance and shear resistance compared with a linear polymer. The preparation method can be widely applied to the fields of oilfield development and the like.

A process for manufacturing organic fibers containing an inorganic component comprising the steps of: (1) preparing an inorganic spinnable sol solution; (2) mixing the inorganic spinnable sol solution, a solvent capable of dissolving the inorganic spinnable sol solution, and an organic polymer capable of being dissolved in the solvent to prepare a spinning solution; and (3) spinning the spinning solution to form the organic fibers containing an inorganic component composed of an inorganic gel and the organic polymer, is disclosed. The inorganic spinnable sol solution preferably has a weight average molecular weight of 10,000 or more, and the inorganic spinnable sol solution is preferably prepared from a material containing a metal alkoxide having an organic substituent. According to the process of the present invention, organic fibers containing an inorganic component having an improved mechanical strength can be produced by mixing an inorganic component into an organic component, and a nonwoven fabric containing the fibers can be provided.

The invention relates to a synthetic method of modified high-toughness epoxy vinyl ester resin, belonging to the technical field of high-molecular polymers. The synthetic method is characterized by comprising the following steps of: (1) sequentially adding 40%-50% of bisphenol A type epoxy resin, 8%-20% of unsaturated monocarboxylic acid, 2.5%-11% of long-chained saturated dicarboxylic acid, 0.1%-1.0% of catalyst A, and 0.01%-0.1% of polymerization inhibitor into a reaction kettle; (2) controlling the temperature to be 100-130 DEG C to measure an acid value until the acid value is reduced to 10mgKOH/g below; and (3) cooling to about 100 DEG C, then adding 28%-40% of crosslinking agent, 1.0-5.0% of polymethylene polyphenyl isocyanate, and 0.05%-0.5% of catalyst B, and controlling the temperature to be 60-80 DEG C until the measured isocyanato concentration is zero, thus achieving the reaction endpoint. The synthetic method has the advantages that the long-chained saturated dicarboxylic acid is used for partially replacing an unsaturated monocarboxylic acid to react, dilution is carried out before the polymethylene polyphenyl isocyanate is added for chain extension, the chain extension reaction is thorough, and the toughness effect is good. The synthetic method is simple in technology, clear in endpoint, less in side effects, and free from generation of three wastes, and the quality is stable.

The invention discloses a processless thermal sensitive plate used for direct printing on a printer. The processless thermal sensitive plate comprises a support body, a thermal sensitive layer and a protective layer, wherein the thermal sensitive layer mainly comprises 30-70% of water soluble thermo-crosslinking polymer, 1-15% of cross-linking agent, 10-30% of polyfunctional group monomer, 1-20% of thermal sensitive initator and 1-20% of infrared light radiation absorbing dye according to percentage by weight based on the composition solid total weight. The shortcomings of low plate developing capacity and bad printing durability in the existing processless thermal sensitive CTP (computer to plate) technology are solved.

The invention relates to a proper cross-linking biodegradable polyester amide atactic block copolymer and a synthetic method thereof. The structure of the atactic block copolymer is shown as the figure. The copolymer has the advantages of excellent mechanical and thermal properties and good biodegradability. Additionally, the atactic block copolymer is amphiphilic and compatible to other polymer materials. The atactic block copolymer is particularly suitable for being used as a biodegradable material, alone or together with thermoplastic starch.

The invention discloses internal-crosslinking aqueous polyurethane emulsion and a preparation method thereof. The preparation method comprises the following steps of: (1) reacting polymer polyols and diisocyanate to obtain a polyurethane compound; (2) adding hydrophilic chain extenders and multifunctional hydroxyl-containing acrylate into the polyurethane compound for reacting, and after the reaction is ended, adding alkali for neutralizing and adding water for emulsifying in sequence to obtain the aqueous polyurethane emulsion; and (3) performing radiation crosslinking on the aqueous polyurethane emulsion by Co-60 gamma rays to obtain the internal-crosslinking aqueous polyurethane emulsion. In the invention, the emulsion is irradiated by using the Co-60 gamma rays to realize the crosslinking of the emulsion, so that the molecular weight of the aqueous polyurethane can be effectively improved, and the aqueous polyurethane emulsion can have higher solid content and better mechanical performance.

A high molecular weight ("HMW") protein of Chlamydia, the amino acid sequence thereof, and antibodies that specifically bind the HMW protein are disclosed as well as the nucleic acid sequence encoding the same. Also disclosed are prophylactic and therapeutic compositions, comprising the HMW protein, a fragment thereof, or an antibody that specifically binds the HMW protein or a portion thereof, or the nucleotide sequence encoding the HMW protein or a fragment thereof, including vaccines.

This disclosure provides methods of controlled polymerization of cyclic compounds catalyzed by carbene derivatives having a general formula as shown below, and to obtain a biodegradable polymeric material having a large molecular weight, a narrow dispersity, and no metallic impurity.

The invention relates to acrylonitrile terpolymer and a preparation method thereof, which mainly solves the problem that acrylonitrile/acrylamide/beta-acrylonitrileitaconic acid ester terpolymer is not related in the prior art. The general formula is shown as the description, wherein m=2,001-4,000; n=5-400; k=5-400; the weight-average molecular weight of the terpolymer is between 150,000 and 400,000; and the molecular weight distribution index is between 1.5 and 2.5. By the technical scheme of the terpolymer and the preparation method thereof, the problem is better solved, and the invention can be applied to industrial production of high performance polyacrylonitrile spinning solution.

The invention relates to a new preparing method of hepatitis c medicine Ledipasvir (I) and new intermediates used in the preparing method. The chemical formula of the Ledipasvir (I) is shown in the specification.

A more complete combustion and a decrease in particulate emissions in the burning of a heavy fuel oil in an industrial boiler or similar combustion device is obtained by first heating the oil to a temperature sufficient to significantly lower its viscosity and continuously mixing a fuel additive containing a solution of a high molecular weight, substantially linear, viscoelastic polymer to the heated oil flowing to the combustion device by mechanically stirring the oil and additive at conditions that do not cause degradation of the viscoelastic polymer through rupture and breakage of polymer molecules.

The invention relates to application of an epoxy functionalized acrylic ester polymer. The acrylic ester polymer is used for a polylactic-acid modified chain extender, has little toxicity without volatility, contains a plurality of epoxy functional groups, and can chemically react with polylactic acid molecular chains in melt blending with polylactic acid and connect two or more than two polylactic acid molecular chains through a chemical bond to greatly improve the molecular weight of the polylactic acid, and the compatibility between the polylactic acid and the acrylic ester polymer is enhanced because of the chemical reaction between the polylactic acid and the acrylic polymer. The modified polylactic acid has the weight-average molecular weight from 367,000 to 505,000, the vitrification conversion temperature from 64.2 DEG C to 66.4 DEG C and the balance torque value from 5.1 N*m to 9.8 N*m and is suitable for subsequent processing.

The invention discloses a polymeric titanium sulfate-PDMDAAC (poly dimethyl diallyl ammonium chloride) composite coagulant as well as preparation and application methods thereof. The preparation method comprises the following steps: 1, preparing a titanium sulfate solution with certain concentration by adding water, placing the titanium sulfate solution in a mixing kettle, dropwise adding a sodium hydroxide solution by controlling certain speed, performing polymerization reaction, stopping adding the materials when the basicity (B) is 0.5-2.5, and continuously stirring for 0.5-1.5h after finishing adding, so as to prepare a colorless and transparent polymeric titanium sulfate solution; 2, placing the prepared polymeric titanium sulfate solution in a mixing reaction kettle, matching according to the fact that the mass ratio of Ti to PDMDAAC is (4-10):1, adding branched-chain PDMDAAC colloid or dry powder under the normal temperature or heating condition; 3, stirring the mixed solution at the normal temperature for 2-4 h, and filtering away insoluble substances, so as to obtain the polymeric titanium sulfate-PDMDAAC inorganic composite coagulant and polymeric titanium sulfate-PDMDAAC organic composite coagulant. The polymeric titanium sulfate-PDMDAAC composite coagulant can be widely applied to fields such as water supply, waste water treatment, papermaking, textile dyeing and printing, and daily-use chemical industry, and has good water treatment effect.