961 results about "Bulk polymerization" patented technology

The present invention relates to a method for preparing an acrylic ester polymer syrup by bulk polymerization, and more particularly, to a method for preparing an acrylic ester polymer syrup, which comprises the steps of: supplying a monomer solution and an initiator solution to a monomer solution reservoir and an initiator solution reservoir, respectively; supplying the monomer solution and the initiator solution to a complete-mixing type continuous reactor, while maintaining the dissolved oxygen in the monomer solution reservoir and the initiator solution reservoir at 0.0001 to 3 ppm, separately or after mixing prior to the supply; and performing bulk polymerization continuously while maintaining the solution mixture supplied to the continuous reactor at 70 to 150 ° C. and 1 to 10 atm, with a mean residence time of 30 to 240 minutes. In accordance with the present invention, an acrylic ester polymer syrup can be obtained with a degree of polymerization of 20 to 70% at a low polymerization temperature, even with a small amount of initiator. Productivity can be improved by reducing reaction time with the use of an initiator having a short half-life and polymerization can be performed very stably and continuously without gelation.

A method for the continuous production of polydienes, the method comprising the steps of (a) charging a mixture of one or more monomer, catalyst system, and less than 50% weight percent organic solvent based on the total weight of the monomer, catalyst and solvent, into first vessel, (b) polymerizing the monomer to a conversion of up to 20% by weight of the monomer to form a mixture of reactive polymer and monomer, (c) removing the mixture of reactive polymer and monomer from the vessel, and (d) terminating the reactive polymer prior to a total monomer conversion of 25% by weight.

A process for the bulk polymerization, in the absence of any solvent, of a reactant containing azide functionality and a reactant containing a terminal alkyne functionality, in the presence of Cu (I) catalyst or in the presence of a Cu(II) catalyst without a reducing agent, is described. Polymerization can be achieved at temperatures less than 100° C., which is suitable for low temperature cures. A controlled synthesis for low molecular weight oligomers is disclosed.

The invention relates to a method for directly synthesizing a pure solid high-performance polycarboxylate water-reducer in one step, belonging to the field of water-reducers. According to the method, the pure solid high-performance polycarboxylate water-reducer is prepared by taking an acrylic compound and unsaturated polyoxyethylene ether as polymerization reaction monomers, adding a molecular weight regulator and carrying out free-radical polymerization reaction under the action of an initiator and under a solvent-free environment. The method disclosed by the invention is strong in controllability, high in polymerization degree, low in cost, environment-friendly and pollution-free, achieves the purpose of preparing the absolutely anhydrous pure solid polycarboxylate water-reducer by bulk polymerization, not only has the fluidity and holding property of cement paste, cement adaptability and concrete application performance which are similar to those of a polycarboxylate water-reducer prepared from a common solution by polymerization and can be prepared into any concentration of solution according to actual demands as the pure solid high-performance polycarboxylate water-reducer prepared by direct polymerization is an anhydrous pure solid, but also is free of postprocessing working procedures, such as heat drying or solvent separation and is more convenient to transport, saved in transport cost and favorable in market competitiveness and application prospect.

The invention discloses a method for preparing a perdurable hydrophilic polyether modified amino-polysiloxane softener. The method is characterized by comprising the following steps: octamethylcy-clotetrasiloxane and amino silane coupling agents with different structures are used as raw materials; with a bulk polymerization method, under the analysis of an alkali catalyst, firstly, an amino organic polysiloxane softener with high ammonia value is generated through ring-opening polymerization; and secondly, on the basis of the amino organic polysiloxane softener, amidogen is subjected to etherifying modification, thereby synthesizing the hydrophilic polyether modified amino-polysiloxane softener with good hand feeling and hydrophilic property. The prepared softener keeps the hydrophilic property and simultaneously improves the softness of hydrophilic silicon oil so that the hand feeling of textile can reach the hand feeling of the prior linearity amino silicon oil after the textile is treated by the softener and the treated textile can keep the hydrophilic property permanently.

The invention relates to a novel selective water shutoff agent for oil well water shutoff, belonging to the technical field of tertiary oil recovery. The water shutoff agent is a composite system of gel particles with the mass concentration of 0.5-5% and a cross-linking agent with the mass concentration of 1-2%, which is prepared by using oilfield injection water; and the water shutoff agent is applicable to water plugging of an oil well at a temperature of 60-120 DEG C. The gel particles are formed by an acrylamide monomer or compounding the acrylamide monomer with a temperature resistant and salt-resistant auxiliary monomer and a cross-linking monomer through copolymerization; the cross-linking monomer is an ester monomer which has a double-bond structure and is easy to resolved when being heated, the expanding and resolving time of the cross-linking monomer at different temperatures can be controlled through adjusting the concentration of the cross-linking monomer, and bulk polymerization or inverse emulsion polymerization is adopted as a polymerization method. In the invention, basically no gel is formed on an oil layer, and high-strength gel can be formed on a water layer, thus defects in the prior art are overcome, the error shutoff phenomenon easily caused by the traditional polymer bulk gel in the oil layer is reduced to the greatest extent, and the capacity of an oil well suffering from water shutoff is ensured.

Novel, simple methods are presented directed to the synthesis of aligned nanofibers of polyaniline and substituted derivatives on a substrate. The production of these fibers is achieved via various methods by controlling the concentration of aniline monomer or substituted aniline derivatives or an oxidant in the reaction medium and maintaining said concentration at a level much lower than conventional polyaniline synthesis methods. Methods are disclosed relating to the use of a permeable membrane to control the release of a monomer and/or oxidant as well as a bulk polymerization method.

The invention relates to a method for preparing waterborne light-cured urethane resin. The waterborne light-cured urethane resin consists of polyatomic alcohol components, diisocyanate, hydroxyl (methyl) acrylic ester, a neutralizer, a catalyst, a solvent, a polymerization inhibitor and water. The target resin is prepared by one-step solution polymerization or bulk polymerization, and the preparation method is simple and easily operated. The densities of the light-curable group and hydrophilic group of the resin prepared are adjustable, and the resin has the advantages of unique hydrophilicity, superior light curing performance and high hardness of film forming matters, and has wide application prospect in the fields of coating, adhesives, ink, etc.

The invention relates to a preparation method of a slow-release solid polycarboxylic acid water reducing agent, which comprises the following steps: pretreating carboxylic acid small monomer containing unsaturated double bond by using amine organic small molecule; and after heating to melt the pretreated unsaturated acrylic small monomer and unsaturated polyethenoxy ether big monomer, dropwisely adding unsaturated ester small monomer to perform mass polymerization reaction under the action of an initiator and a chain-transfer agent in a water-free organic-solvent-free environment. The slow-release solid polycarboxylic acid water reducing agent prepared by the mass polymerization process in the water-free solvent-free environment has the advantages of simple and controllable technique, transportation cost saving, environment friendliness, no pollution and the like, achieves the goal of slow release and keeping the slump for 3-4 hours without loss in concrete, and has wide market application prospects.

The invention provides a polylactic acid block polymer and a preparation method thereof. The preparation method comprises the following steps: mixing poly(adipic acid-terephthalic acid)butanediol copolyester, lactide and a first catalyst, and heating to a molten state to react, thereby obtaining the polylactic acid block polymer disclosed as Formula (I). Compared with the polymer obtained by the PLA-PBAT chain extension reaction initiated by diisocyanate in the prior art, the invention uses the molten-state poly(adipic acid-terephthalic acid)butanediol copolyester as the reactant to directly initiate the ring-opening polymerization of lactide, and the polymerization method is mass polymerization without adding the chain extender diisocyanate or any organic solvent, thereby avoiding jeopardizing the human body and environment; the raw materials can be mixed and heated to react to obtain the polylactic acid block polymer, so that the preparation method is simpler and lowers the preparation cost; and the polylactic acid block polymer provided by the invention has definite structure and narrow molecular weight distribution.

High concentration drag reducing agents may be prepared by microencapsulating and/or macroencapsulating polymer drag reducing agent. The encapsulation may be performed prior to, during, or after the polymerization of monomer into effective drag reducing polymer. If encapsulation is done before or during polymerization, a catalyst may be present, but little or no solvent is required. The result is very small scale bulk polymerization within the capsule. The inert capsule or shell may be removed before, during or after introduction of the encapsulated drag reducer into a flowing liquid. No injection probes or other special equipment is expected to be required to introduce the drag reducing slurry into the liquid stream, nor is grinding (cryogenic or otherwise) of the polymer necessary to form a suitable drag reducing agent.

The present invention provides a preparation method for aqueous polyurethane. The method comprises the following steps: mixing aliphatic diisocyanate, an aliphatic polyol, dimethylol propionic acid and a catalyst, and carrying out a reaction to obtain a prepolymer; adding a neutralizing agent to the prepolymer, and carrying out a stirring reaction to obtain an intermediate product; adding water and a chain extender to the intermediate product, stirring and dispersing to obtain the aqueous polyurethane, wherein the chain extender is polyoxyethylene polyamine or polyoxypropylene polyamine. The invention further provides the aqueous polyurethane prepared by the method. According to the present invention, the bulk polymerization method is adopted, the use of the organic solvent is not required, and no environmental pollution is generated; the polyoxyethylene polyamine or the polyoxypropylene polyamine is adopted as the chain extender, and is used for emulsion chain extending, such that the obtained polyurethane emulsion has good film-forming flexibility, the mechanical property of the obtained polyurethane can not be reduced, the large R value is not required, and the final produced polyurethane film is soft.

A process for preparing a polydiene, the process comprising the step of polymerizing conjugated diene monomer with a lanthanide-based catalyst system including the combination or reaction product of: (a) a lanthanide compound selected from the group consisting of lanthanide organophosphates, lanthanide organophosphonates, and lanthanide organophosphinates, (b) an alkylating agent, and (c) a chlorine-containing compound, where said step of polymerizing takes place within a polymerization mixture that includes less than 20% by weight of solvent based on the total weight of the polymerization mixture.

The invention relates to a process for the production of post-crosslinkable thermoplastic resins by bulk-polymerizing a polymerizable composition (A) comprising (I) a monomer fluid containing a cyclic olefin (α) having two or more metathetical ring-opening reaction sites in the molecule in an amount 10 wt % or above based on the total amount of the monomers or a monomer fluid containing a norbornene monomer and a crosslinking agent, (II) a metathetical polymerization catalyst, and (III) a chain transfer agent; thermoplastic resins obtained by this process; and a process for producing crosslinked resins or crosslinked resin composite materials which comprises laminating such a thermoplastic resin with a substrate at need and then crosslinking the thermoplastic resin. According to the invention, thermoplastic resins which are free from odor due to residual monomers and excellent in storage stability can be efficiently obtained by a simple process of bulk-polymerizing the composition (A). The process is not only easy and simple but also applicable to continuous production, thus being industrially advantageous. The crosslinked resins and crosslinked resin composite materials obtained according to the invention are excellent in electrical insulation properties, mechanical strengths, heat resistance, dielectric characteristics and so on, thus being useful as electrical materials or the like.

The invention provides a preparation method for a methyl methacrylate polymer with high thermal stability, and continuous bulk polymerization or solution polymerization is adopted in the invention. According to the invention, no free radical scavengers or cross-linking agents need to be added in the preparation method; instead, unstable structures like a head-to-head structure and a terminal unsaturated double bond in the molecular structure of the methyl methacrylate polymer is gradually eliminated by controlling polymerization temperature, devolatilization temperature, polymerization time and devolatilization time in the continuous polymerization process of methyl methacrylate, thereby achieving the goal of improving thermal stability of PMMA. Preparing a PMMA resin with the method not only enables the PMMA resin to have excellent thermal degradation resistance, but also enables other inherent excellent properties of the PMMA resin to be guaranteed. The methyl methacrylate polymer prepared by the method in the invention has high thermal degradation resistance, with a starting thermal degradation temperature being higher than 360 DEG C. With utilization of the method, light transmittance of the PMMA resin is guaranteed to be 93%, and molecular weight distribution of the PMMA resin is guaranteed to be less than 1.8, while thermal stability of the PMMA resin is improved.

The invention discloses a polyalcohol modified epoxy resin carbon fiber emulsion sizing agent component and a preparation method thereof. The method comprises the steps of ring-opening the preparing modified epoxy. The modified epoxy resin has hydropathy, can be dissolved in water, and can be prepared into a modified epoxy emulsion under certain conditions. The modified epoxy emulsion is the polyalcohol modified epoxy resin carbon fiber emulsion sizing agent component. A foreign emulsifying agent is added in the preparation process, and the modified epoxy emulsion belongs to a self-emulsifying system without breaking the emulsion and demixing and has controllable and proper viscosity, good standing stability, excellent pH value stability and high-temperature stability. The foreign emulsifying agent does not remain on the fiber after the sizing; and compared with the carbon fiber without being sized, the carbon fiber coated with the sizing agent component has less broken filament amount and good bundling performance, and can ensure that the interface performance is improved because of a structure that one end of the modified epoxy resin is a polyether bond and the other end is an epoxy group.

The invention relates to nanometer particle surface functionalization and the preparation method of the transparent polymer nanometer composite material, which belongs to the chemical material field. The functionalization for the surface of the nanometer particles can be performed by using an organic small molecule with a nitrogen-containing function (eg. 8-hydroxy quinoline and phenanthroline derivative) though a method of ligand exchanging or direct situ decorating. The functional nanometer particles can be coated directly during the synthetic process or synthetized through ligand exchanging later, and the nanometer particles have a good fluorescence property. The functionalized nanometer particles and the polymer are compounded for preparing the transparent polymer nanometer composite material through a solution co-blending method and a situ bulk polymerization method. The method for functionalizing nanometer particle integrate the functions of organic functional molecules and the functions of nanometer particles into one, and a novel approach for constructing novel functional nanometer particles is provided. The prepared functional nanometer particles/ polymer composites material have important application value in the fields, such as photoelectric apparatus, display devices and solar batteries, and the like.

The invention relates to a preparation method of polypropylene wax. The method is characterized in that a liquid phase bulk polymerization technology is used, a supported metallocene catalyst is used, hydrogen is adopted as a molecular weight regulator, and a granular polypropylene wax product is directly obtained through catalyzing liquid propylene polymerization. The propylene polymerization reaction activity is not lower than 1000 times/h. The method has the characteristics of simple operation and high polymerization reaction activity, and the molecular weight of the polypropylene wax product obtained in the invention is adjustable and has narrow distribution.

The invention discloses a method for preparing a high-toughness thermoplastic fluorine-containing polyurethane elastomer, which is characterized in that a bulk polymerization two-step method is adopted to synthesize the fluorine-containing polyurethane elastomer, the isocyanate index is 0.98, and the hard segment content is between 20 and 40 weight percent. The method comprises the following steps of: weighing 6 to 40 parts of non-fluorine macromolecular polylol and/or 30 to 80 parts of fluorine-containing polyether diol in a reactor, performing vacuum dehydration on the mixture for 2h at thetemperature of 120 DEG C, cooling the mixture to be between 70 and 100 DEG C, adding 16 to 33 parts of polyisocyanate into the mixture, stirring the mixture to react for 3h, heating the mixture to bebetween 120 and 140 DEG C, adding 0.1 to 15 parts of low molecular (fluorine-containing) diol chain extender into the mixture, uniformly stirring the mixture, then dumping the mixture into a preheated container, and performing vacuum baking for 20 hours at the temperature of between 120 and 140 DEG C to obtain the high-toughness thermoplastic fluorine-containing polyurethane elastomer.

The invention discloses a method for preparing poly(monothiocarbonate). According to the method, carbon oxysulfide and oxygen-containing monomers are used as raw materials; a catalysis system consisting of initiators and Lewis acid is used; after the bulk polymerization or solution polymerization, poly(monothiocarbonate) is obtained; the oxygen-containing monomers are selected from at least one kind of materials of epoxy compounds, oxetane and 3-substituted oxetane; the initiators are selected from quaternary ammonium salt, quaternary phosphonium salts or organic alkali. The preparation method of synthesizing the poly(monothiocarbonate) through anion ring-opening polymerization by using a catalytic system formed by at least one kind of materials from quaternary ammonium salt, quaternary phosphonium salts or organic alkali, and the Lewis acid; the poly(monothiocarbonate) with the specific chain structures can be obtained through preparation. The catalysis system can be obtained only through compounding; the metal residue and color residue problems do not exist.

A nano-class magnetic composite Fe3O4/polystyrene material is prepared through mixing the aqueous solution of two-valence Fe salt with that of three-valence one, adding alkali solution containing surfactant, reacting to obtain Fe3O4 nanoparticles, and ball grinding for dispersing them in styrene monomer while polymerizing reaction.