105 results about "Bulk polymerization" patented technology

The invention provides a prepolymerization reactor, a continuous bulk polymerization system and method and PMMA resin. The method comprises the following steps: mixing accurately metered polymeric monomers and auxiliaries, sequentially completing a prepolymerization reaction and a polymerization reaction in serially connected polymerization reactors, and then devolatilizing and granulating a polymerization product to obtain PMMA resin, and comprises the following steps: step 1, purifying and mixing reaction materials; step 2, prepolymerization reaction; step 3, polymerization reaction; step 4, devolatilization; and step 5, granulating. The method overcomes the defects that in the prior art, the polymerization conversion rate is low, the solvent usage amount is large, the molecular weight distribution of the product is wide, light transmittance and other properties cannot meet optical-grade application requirements, and the quality is difficult to accurately regulate and control. Through optimization of a formula and process conditions, a special process system design and combination of polymerization reactors, the contradiction between high conversion rate in the polymerization process and narrow molecular weight distribution of a PMMA product is solved; under the conditions of low solvent addition amount or no solvent, the high conversion rate is obtained, the molecular weight distribution of the polymerization product is narrow, the molecular weight is controllable, and the high-quality optical-grade PMMA resin product is obtained.

The invention belongs to the technical field of high-molecular compounds, and particularly discloses a method for preparing polymethyl methacrylate (PMMA) based on a bulk polymerization method, which comprises the following steps: S1, taking methyl methacrylate as a monomer, and mixing the monomer with an initiator under the protection of inert gas to form a homogeneous solution; s2, partially polymerizing the homogeneous solution at 60-80 DEG C until the monomer conversion rate reaches 10-30% to obtain a prepolymer; s3, continuing to polymerize the prepolymer at 80-100 DEG C until the monomer conversion rate exceeds 90%; and S4, carrying out devolatilization treatment at 100-120 DEG C under a vacuum condition to obtain PMMA with the molecular weight of more than 100,000. The problems that the polymerization process is not easy to control, the product performance is unstable, the molecular weight distribution is wide and the like in the prior art are solved, and efficient preparation of the PMMA material with high purity, narrow molecular weight distribution and high transparency can be realized.

The invention belongs to the technical field of polyester degradable plastics, and particularly relates to a PBAT / PLA composite degradable plastic and a preparation process thereof. The invention aims to solve the problems of poor weather resistance and insufficient mechanical properties of the existing PBAT / PLA composite material. The preparation method comprises the following steps: preheating PBAT resin particles, and carrying out melt grafting treatment to obtain modified PBAT; hydroxyl-terminated PBS is obtained through ester exchange polycondensation treatment, and a triblock compatilizer is further obtained through bulk polymerization; the preparation method comprises the following steps: carrying out acetylation modification on nano cellulose to obtain a dispersion enhancer, and carrying out melt blending on the dispersion enhancer and PLA resin particles to obtain enhanced master batches; and carrying out reactive blending on the modified PBAT, the reinforced master batch and the triblock compatilizer, and carrying out vacuum drying to obtain the degradable plastic. The degradable plastic provided by the invention keeps excellent degradability while having good mechanical strength.

The invention discloses a preparation method of PMI foam. The preparation method comprises the following steps: step A, uniformly mixing acrylonitrile monomers, acrylic monomers, an initiator, a foaming agent, a cross-linking agent and a retarder; step B, adding the mixed material into a mold, sealing, and carrying out bulk polymerization reaction at 30-60 DEG C to obtain a precursor; step C, taking out the precursor, drying, and foaming at 150-200 DEG C; and step D, carrying out curing treatment under the condition of 140-180 DEG C. According to the preparation method, a specific polymerization retarding system is mainly selected, so that the polymerization rate can be finely regulated and controlled, the polymerization process can be mildly initiated and finely controlled, the gel effect can be effectively delayed, heat can be timely dissipated, and a favorable influence is generated on the copolymerization behavior.

The invention discloses a gas-phase polymerization evaluation method of a polypropylene catalyst, and relates to the technical field of catalyst evaluation.The gas-phase polymerization evaluation method of the polypropylene catalyst comprises the following steps that firstly, under the condition of a catalyst A1, polymerization I is conducted, and a polypropylene seed bed is obtained; 2, propylene and optional hydrogen are subjected to polymerization II in the presence of a catalyst A2 to be evaluated and the polypropylene seed bed, and a polymer containing the polypropylene seed bed is obtained; 3, separating the polymer containing the polypropylene seed bed to obtain a polymer; the gas phase copolymerization evaluation method of the polypropylene catalyst is simple, rapid and accurate; the seed bed is generated through a bulk polymerization reaction, the influence of impurities brought into an external seed bed on subsequent polymerization evaluation is avoided, and meanwhile, the seed bed is prepared by selecting a catalyst with relatively large particle size difference, so that the later separation of the seed bed can be simple, convenient and effective.

The invention discloses a cross-linked polystyrene anion exchange membrane as well as a preparation method and application thereof. The preparation method of the cross-linked polystyrene anion exchange membrane comprises the following steps: firstly, taking styrene and p-chloromethyl styrene as monomers, and obtaining a copolymer through bulk polymerization under the action of an initiator; the preparation method comprises the following steps: firstly, preparing a copolymer from polystyrene, then preparing a membrane casting solution from the copolymer and 1, 4-diazabicyclo [2.2. 2] octane, casting to form a membrane, then immersing the obtained membrane into a trimethylamine aqueous solution for complete quaternization, and finally treating in a KOH aqueous solution to obtain the cross-linked polystyrene anion exchange membrane. The invention provides an application of the cross-linked polystyrene anion exchange membrane in alkaline electrolyzed water. The anion exchange membrane is simple in synthesis process, reagents are cheap and easy to obtain, the contradiction between the OH <-> conductivity and the size stability of a traditional anion exchange membrane can be greatly balanced, and meanwhile the anion exchange membrane has high alkaline stability and shows excellent electrolytic performance in alkaline electrolyzed water.

This invention belongs to the field of biomedical polymer materials technology, and relates to a method for preparing an injectable thermosensitive composite hydrogel that promotes wound healing, and its application. Polyethylene glycol monomethyl ether is used as a macromolecular initiator, and stannous octoate is used as a catalyst to initiate the bulk polymerization of six-membered cyclic carbonate monomers and their derivatives. After polymerization, coupling is performed via hexamethylene diisocyanate to obtain an amphiphilic block polymer with hydrophilic ends and an oleophilic middle. The block polymer is then dissolved in PBS at low temperature, and a certain proportion of wound-healing nanoparticles are uniformly dispersed in the polymer aqueous solution to obtain the injectable thermosensitive composite hydrogel. This composite hydrogel is a viscous liquid at room temperature and has a viscosity of 34°C. o It rapidly gels in environments above °C, meaning that after injection into the body, it can gel quickly and release nanoparticles in situ to promote wound repair. It also possesses excellent wound-healing capabilities.

The invention discloses a molecularly imprinted membrane of a new psychoactive substance and a preparation method and application of the molecularly imprinted membrane, the molecularly imprinted membrane comprises a membrane substrate and an adsorption material layer arranged on the membrane substrate, and the material of the adsorption material layer comprises 3, 3 ', 4', 4 '-tetramethyl-3, 3', 4 '-tetramethyl-3, 3'-tetramethyl-3, 3 '-tetramethyl-3, 3'- The molecularly imprinted polymer is prepared by using 2, 4-methylenedioxyphenylethylamine as an alternative template and using a bulk polymerization method. The novel molecularly imprinted membrane prepared by combining a molecularly imprinted technology and a separation technology is used as a membrane extraction material, and integrates the advantages of a membrane extraction technology and an imprinting technology, so that the problems that a membrane material is easy to pollute and low in selectivity are solved, and the novel molecularly imprinted membrane is suitable for being used as a membrane extraction material. The method shows the capability of accurately identifying a target analyte in the membrane separation process, has the advantages of high efficiency, stability, repeatability and the like, and provides a new technical means and potential application for identifying and detecting common forbidden drugs in a water body.

The application belongs to the field of polymer synthesis, and particularly relates to a modified PBT copolyester, and a preparation method of the modified PBT copolyester. x BT y copolyester. The modified PBT copolyester is prepared by using a bio-based monomer synthesized from a renewable resource through a green and environmentally-friendly synthesis method and an easy-to-operate synthesis process. The obtained copolyester has high toughness, and the defects of pure PBT are compensated, so that the copolyester has a wider application.

The invention relates to the technical field of polymer drying, in particular to a bulk polymer drying machine and a bulk polymer drying method.The drying machine comprises a barrel, a rake tooth transmission shaft and a controller, and the rake tooth transmission shaft is rotationally arranged in the barrel in the axial direction of the barrel; a jacket of the barrel is divided into three independent heating chambers from bottom to top, namely a lower jacket, a middle jacket and an upper jacket; the lower jacket is connected with the first heating medium system, the middle jacket is connected with the second heating medium system, and the upper jacket is connected with the third heating medium system; a heat transfer channel is formed in a hollow cavity of the rake tooth transmission shaft and is connected with a second heating medium system; heating medium temperature sensors are respectively arranged at heating medium inlets and outlets of the lower jacket, the middle jacket and the heat transfer channel; and all the heating medium temperature sensors and all the heating medium systems are in communication connection with the controller. The technical problem that in a traditional single-jacket heating mode, due to the fact that the material drying processes in different spaces are not synchronous, efficiency and quality are difficult to consider at the same time is solved.

This invention provides the application of a mixture of methylstyrene with high para-isomer content in the preparation of polystyrene substitute copolymers, belonging to the field of polymer material synthesis technology. This invention is the first to directly utilize a low-cost mixture of methylstyrene isomers to replace high-purity styrene. Through a "boiling-condensation" cycle in the fluidized bed polymerization process, efficient and constant-temperature heat dissipation is achieved, effectively overcoming the heat transfer difficulties and temperature runaway risks of traditional bulk polymerization. This facilitates control of the polymerization mechanism and yields random copolymers with a narrow molecular weight distribution and mechanical properties comparable to general-purpose polystyrene. This method is simple and controllable, significantly reduces raw material costs, and combines economic benefits with environmental value. The resulting copolymers can be used in general plastics, packaging materials, and other fields.

Disclosed are microcomposites comprising one or more microcomposite units where each microcomposite unit includes a nucleating component with a nucleating surface and a porous transcrystalline layer made of a crystallizable thermoplastic polymer covering the nucleating surface where the microcomposite is devoid of a bulk polymer matrix phase and, in some preferred embodiments is also substantially devoid of amorphous thermoplastic polymer in the pores of the transcrystalline layer, and methods of making the same.

The application relates to a production device and method of a polypropylene product, and belongs to the technical field of olefin polymerization. The production system comprises a catalyst providing unit, a propylene providing unit, a prepolymerization unit, a comonomer providing unit, a reaction unit, a flash evaporation unit, a medium-pressure separator, a low-pressure separator, a condensation recycling unit, a purification bin and a monomer recycling system. The polymer degassing and propylene and comonomer recycling section of the production system only comprises a flash evaporation process, a gas-solid separation process, a compression and condensation process, a purging process and a membrane recycling process. The gas-solid separation process is carried out in three steps in the medium-pressure separator, the low-pressure separator and the purification bin, the washing, steaming, drying and propylene / ethylene stripping separation processes in the original loop body polymerization process are cancelled, the polymer degassing and propylene / comonomer recycling section process is greatly simplified, the layout is more compact, and the equipment investment and wastewater discharge are reduced.

This invention provides a method for preparing and applying an ester resin. The fluorinated acrylate resin includes polymerizable monomers, an initiator, and a fluorinated comonomer. This invention prepares a fluorinated acrylate copolymer via bulk polymerization, exhibiting excellent solvent resistance, hydrophobicity, and toughness, solving the problems of high water absorption and poor solvent resistance in traditional polymethyl methacrylate (PMMA) films. The preparation method employs a mild polymerization process with a simple procedure. By rationally controlling the monomer ratio and reaction conditions, the resin retains its original advantages such as high light transmittance (>92%), light weight, and ease of processing while improving hydrophobicity and solvent resistance, and simultaneously enhancing material toughness. The fluorinated acrylate resin prepared by this invention has a stable structure and excellent performance, and can be widely used in transparent protective coatings, optical films, hydrophobic functional materials, and other fields, effectively broadening the application range of PMMA materials.

The utility model relates to the technical field of master and auxiliary material production, and discloses an efficient master and auxiliary material polymerization device for expanding agents, which comprises a polymerization component, a stirring component arranged inside the polymerization component and a heating component arranged outside the polymerization component, the polymerization component comprises a polymerization tank body, a feed pipe is mounted at the upper end of the polymerization tank body, and a feed pipe is mounted at the lower end of the polymerization tank body. The lower end of the inner wall of the polymerization tank body is fixedly connected with an extrusion block, the stirring assembly comprises a motor, the output end of the motor is fixedly connected with a transmission shaft, stirring rods are arranged on the two sides of the transmission shaft, and the lower end of the transmission shaft is fixedly connected with an impact rod. And finally, the stirring rods move, the rotating directions of the two stirring rods and the transmission shaft are opposite, the stirring efficiency is improved, and under the mutual cooperation of an extrusion block and an impact rod, caked auxiliary materials are smashed, and discharging is convenient.

The application relates to the technical field of foaming materials, and discloses a high-toughness expandable polystyrene blended foaming material and a preparation method, the method comprises the following steps: rubber nanoparticle preparation, prepolymerization, reaction extrusion bulk polymerization, additive addition and mixing, cutting granulation, drying and screening, and foaming treatment; in the application, rubber raw materials are processed into nanoscale particles through nanogrinding technology, and the rubber raw materials are made into block copolymer structures with polystyrene monomers by using a reaction extrusion bulk polymerization method; the rubber phase is uniformly dispersed and chemically bonded at the molecular level in the polystyrene matrix, as stress absorption points, the toughness, impact resistance and mechanical property consistency are improved, phase separation and stress concentration are avoided, and the material has uniform deformation capacity and energy dissipation mechanism when being stressed.

The invention belongs to the technical field of inverse opal photonic crystal materials, and discloses an anthracene-doped inverse opal structure thin film with a function of rapidly preparing a fluorescent pattern, and a preparation method and application of the anthracene-doped inverse opal structure thin film. The film is formed by compounding a polyacrylate copolymer and a silicon dioxide photonic crystal and etching in hydrofluoric acid. The polyacrylate copolymer is obtained by carrying out bulk polymerization on polyethylene glycol monophenyl acrylate doped with 10-(1-naphthyl) anthracene-9-boric acid and ethoxylated trimethylolpropane triacrylate under the action of a photoinitiator, namely 2-hydroxy-2-methyl-1-phenylacetone. The film has great application potential in the aspects of visual optical anti-counterfeiting and programmable fluorescent switch integration, and is expected to become a new generation of optical anti-counterfeiting label due to the characteristics of rapid patterning and high brightness.

The invention discloses a castor oil-polycarbonate copolymer for plasticizing polyvinyl chloride and a preparation method of the castor oil-polycarbonate copolymer. The castor oil-polycarbonate copolymer can be prepared by adopting solution or bulk polymerization, under the catalytic action of a Lewis acid-base pair or an initiation-catalysis bifunctional catalyst, firstly, an epoxy monomer and an initiator are subjected to reaction chain initiation, then chain transfer occurs, and a polycarbonate chain segment continues to grow on castor oil, so that the castor oil-polycarbonate copolymer is obtained. Compared with the existing commercialized polyvinyl chloride plasticizer, the castor oil-polycarbonate copolymer has the advantages of greenness, degradability, excellent toughening effect and lower preparation cost, has the advantages of no toxicity, difficulty in migration or leaching and the like due to a star-shaped structure and high molecular weight, and has a wide application prospect.

This invention discloses a bimodal styrene-acrylic resin, its preparation method, and its applications, belonging to the field of polymer materials. The method for preparing the bimodal styrene-acrylic resin provided by this invention first generates a prepolymer with a certain molecular weight (as a precursor for high molecular weight segments) through semi-continuous bulk polymerization; subsequently, a chain transfer agent is added during the suspension polymerization stage, and the growing polymer chains are quantitatively broken by chain transfer reaction to form low molecular weight segments and generate new active centers; by adjusting the concentration of the chain transfer agent, the short chain length can be controlled, and the bimodal molecular weight distribution of the styrene-acrylic resin can be precisely regulated. This allows for the simultaneous construction of high molecular weight and low molecular weight segments in the same resin system.

Provided in the present application are a virus removal filter membrane and a preparation method therefor, belonging to the technical field of membrane separation. The filter membrane preparation method comprises blending a hydrophilic polymer and a bulk polymer to prepare casting solutions having different viscosities, and on the basis of a double-layer homogeneous compounding method and a phase conversion method, preparing the filter membrane. The filter membrane has an integrated structure, and comprises a dense separation layer distributed along the thickness direction of the filter membrane and a pre-filter support layer having a loose sponge structure. The separation layer is adjacent to the support layer, but there is no obvious interface or stratification. The pore diameters of the separation layer and the support layer has a continuous gradient change along the thickness direction, wherein the pore diameter of the support layer is greater than the pore diameter of the separation layer.

A preparation process for a solid acrylic resin suitable for a UV curing system is a bulk polymerization method and comprises the steps: adding 100 parts by mass of at least one monofunctional monomer(s) having one polymerizable double bond per molecule, 1-10 parts by mass of one difunctional monomer having two polymerizable double bonds per molecule, 0.1-5.0 parts by mass of an initiator and 1-10 parts by mass of a chain transfer agent to a bulk polymerization reactor capable of water bath heating; homogenizing them by stirring; and then heating the bulk polymerization reactor with a constant temperature water bath at 40-90° C. until the polymerization reaction is completed.

The invention discloses a method for preparing syndiotactic polystyrene through transition metal catalysis. According to the method, an aryl ether-transition metal chromium compound is adopted to catalyze styrene to polymerize so as to prepare syndiotactic polystyrene. According to the preparation method of the compound, an aryl ether compound reacts with tetrahydrofuran chromium trichloride to obtain a chromium complex, then the chromium complex and aluminum alkyl form a catalytic system, bulk polymerization is performed in styrene to obtain syndiotactic polystyrene, and the syndiotactic polystyrene has the advantages of good stereoselectivity and high activity.

The invention discloses a mechanochromic molecule based on crystal violet lactam, a bulk polymer and application of the mechanochromic molecule and the bulk polymer, a force sensitive unit and an introduction process of a polymerizable functional group are organically combined, the synthesis steps are effectively simplified, the preparation cost is reduced, and a new thought is provided for design of a controllable and specific mechanochromic material. According to the invention, accurate regulation and control of color and force-induced discoloration behaviors are realized through molecular structure optimization and polymer structure design. The molecule has the advantages of simple and convenient synthesis steps, cheap raw materials and low cost, can realize large-scale preparation, and shows a stable and remarkable force-induced discoloration effect in a polymer material during mechanical compression or stretching, so that the molecule has a wide application prospect.

The invention relates to an industrial preparation method of solid epoxy acrylic resin with high water permeability resistance and high light transmittance. The industrial preparation method comprises the following steps: (1) providing a material for preparing the solid epoxy acrylic resin with high water permeability resistance; (2) providing a plurality of plastic material bags, and (3) fully and uniformly mixing the materials for preparing the solid epoxy acrylic resin, dividing the materials into a plurality of parts, respectively loading the parts into the plurality of plastic material bags, and putting the plurality of plastic material bags loaded with the materials into a water bath to carry out polymerization reaction. According to the method, the solid epoxy acrylic resin with high water permeability resistance and high light transmittance is prepared through a simple polymerization bag body polymerization method, the water vapor permeability is smaller than 0.3%, the light transmittance is larger than 90%, yellowing is avoided, and the solid epoxy acrylic resin can be used for preparing photovoltaic cover plate light assemblies, light-transmitting sealing coatings and the like.

The invention discloses a method for preparing PMI (polymethacrylimide) foam by a composite foaming method. The method comprises the following steps: step A, uniformly mixing a reaction monomer, a chemical foaming agent, a cross-linking agent and an initiator; step B, performing initiation activation at the temperature of 30-70 DEG C; step C, adding the activated mixed material into a mold, sealing, and carrying out bulk polymerization reaction at 30-70 DEG C to obtain a precursor; step D, putting the precursor into a foaming mold, injecting supercritical gas, pressurizing to 3-50 MPa at 40-150 DEG C, and keeping the temperature and pressure for 1-24 hours; e, releasing pressure, and foaming for the first time; and step F, foaming for the second time under the gradient high temperature condition. Through a composite foaming technology, the PMI foam with the average pore size being smaller than 50 m and even reaching the 10m level (ultramicropore) can be prepared, the pore size distribution is more uniform, and the heat insulation performance can be remarkably improved.

The application discloses an optical adhesive suitable for adhering plastic plates (such as PC and PMMA), and the optical adhesive has good adhesion and optical performance, and can inhibit the appearance of bubble, white edge and other appearance defects in a high-temperature and high-humidity environment. In addition, the optical adhesive is prepared by using a UV polymerization method, and the optical adhesive is prepared by carrying out bulk polymerization through photo-initiation, so that the optical adhesive has the advantages of improved production capacity and environmental protection.

The present invention relates to the field of polymerisation of lactic acid to form polylactic acid (PLA). The present invention in particular relates to a process for mass polymerisation in a PLA production process. The present invention also relates to an apparatus for performing the process of the invention, and to the use of the present process or apparatus in the production of a polylactide polymer.

The invention belongs to the field of olefin polymerization, and discloses a polypropylene catalyst activity center environment regulation and control method and a polypropylene preparation method. The additive is introduced into the existing magnesium-titanium polypropylene catalyst, so that the distance between adjacent active centers is increased; or removing a part of active centers in the polypropylene catalyst through an additive, and loading the electron donor and the titanium-containing compound on the surface of the polypropylene catalyst again to realize regulation and control of the Ti content of the active centers on the surface of the polypropylene catalyst and the distance between adjacent active centers. The ultra-high molecular weight polypropylene with the characteristics of high isotacticity, low entanglement, easiness in processing, high strength and high toughness can be prepared by performing propylene bulk polymerization or slurry polymerization on the polypropylene catalyst regulated by the active center.

The invention relates to a thermally-induced anisotropic conductive film and a preparation technology thereof, and belongs to the technical field of new material preparation. The method comprises the following four steps: (1) preparing VO2 (M) by combining hydrothermal and high-temperature roasting; (2) synthesizing polymethyl methacrylate (PMMA) by a bulk polymerization method; (3) preparing a spinning solution; and (4) preparing the [PMMA] / / [VO2 / PMMA] Janus micro-ribbon array thermally-induced anisotropic conductive film by adopting a two-axis parallel electrospinning technology. When heating is carried out (80 DEG C), the prepared thermally-induced anisotropic conductive film has strong thermally-induced anisotropic conductivity, that is, high thermally-induced anisotropic conductivity is realized through heating. The preparation method is simple and easy to implement, batch production can be achieved, and the novel anisotropic conductive film material has wide application prospects.

This invention relates to a method for preparing a glycidyl methacrylate polymer, comprising the following steps: S1: under the action of a first initiator, a first monomer is subjected to a bulk polymerization reaction at a first temperature to obtain a first polymerization system; S2: a second monomer and a second initiator are added to the first polymerization system, and a bulk polymerization reaction is carried out at a second temperature to obtain a second polymerization system; and S3: a third monomer and a third initiator are added to the second polymerization system, and a bulk polymerization reaction is carried out at a third temperature. The method for preparing a glycidyl methacrylate polymer according to one embodiment of this invention, by using gradient heating and batch addition of monomers for bulk polymerization, can improve the monomer conversion rate and reaction yield.