21 results about "Bulk polymerization" patented technology

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.

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.

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 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.

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.

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.

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.

The application discloses a polyoxazolidinone prepared by heterogeneous catalytic bulk polymerization and a method, and belongs to the technical field of polymer material synthesis. The method comprises the following steps: uniformly mixing an antioxidant and a polyisocyanate, vacuum drying to obtain a mixed solution; uniformly mixing cardanol diglycidyl ether and bisphenol F diglycidyl ether, vacuum drying to form an epoxide composition; adding 1-butyl-3-methyl imidazole chloride and aluminum trioxide into mesoporous silica, and baking to obtain a supported heterogeneous catalyst; fully dispersing the composition and the catalyst, and then gradually adding the mixed solution under temperature rising, so that the conversion rate of an epoxy group reaches 68-72%; then, the mixed solution is gradually added under temperature rising, so that the conversion rate of the epoxy group is improved; finally, the mixed solution is gradually added under temperature rising, so that the reaction is completed; the filtered filtrate is degassed and granulated, and polyoxazolidinone particles are obtained, so that the purity, mechanical property and thermal stability of the polyoxazolidinone are improved.

The application belongs to the technical field of coal water slurry additives, and discloses a solid polycarboxylic acid coal water slurry dispersant and a preparation method and application thereof. The method is to melt copolymerize polyether macromonomer, acrylic acid, ester monomer M-TB and 3-sulfopropyl acrylate under the action of an initiator, and obtain the dispersant after neutralization. The solid polycarboxylic acid coal water slurry dispersant is prepared by using a solvent-free bulk polymerization process, the synthesis method is simple, there is no solvent emission, the environmental protection pressure is small, and the product has better transportation convenience. By introducing the ester monomer M-TB containing a butoxy ester side chain and the sulfonic acid monomer containing a strong anion sulfonic acid group, the adsorption capacity and electrostatic repulsion of the dispersant on the surface of coal particles are significantly enhanced, the obtained product has excellent dispersion viscosity reduction effect and stability, the molecular structure is flexible and adjustable, the product can meet the needs of different coal types and slurry preparation processes, and is suitable for industrial production.

The utility model belongs to the field of polymerization reaction, concretely relates to a kind of bulk polymerization reactor, reaction tank, the top of the reaction tank is provided with tank cover, the inner wall of the tank cover is rotatably connected with rotating shaft, adjusting assembly is provided on the tank cover, stirring paddle is provided on the adjusting assembly, the adjusting assembly includes threaded seat, the bottom of the tank cover is fixedly connected with threaded seat, the inner wall of the threaded seat is threadedly connected with threaded rod, the top of the threaded rod is fixedly connected with rotating block.This bulk polymerization reactor is accurately lifted on threaded seat by rotating rotating block, drives arc clamping seat, synchronous disc and sliding long board to move cooperatively, the angle of stirring paddle can be adjusted quickly, the design can flexibly change stirring paddle angle according to different material characteristics and reaction stage, compared with traditional fixed-angle stirring paddle, material mixing efficiency is improved, effectively avoid the problem of insufficient or excessive reaction in local reaction.

This invention proposes a method for preparing high-impact ABS resin based on a bulk polymerization process. The method includes: using styrene as the continuous phase medium, adding polybutadiene rubber to styrene and stirring to form a pre-dispersed rubber phase core; adding an initiator to the rubber dissolution product, heating and stirring to form graft copolymer segments; adding acrylonitrile to the prepolymerization product and stirring to form rubber phase particles during the copolymerization stage; adding a chain transfer agent to regulate free radical chain transfer, achieving a gradient distribution of acrylonitrile content from the core to the outer layer, constructing a multi-level interfacial structure with an energy dissipation gradient, and forming a tertiary multi-component copolymer system; subjecting the copolymerization product to vacuum devolatilization treatment, extrusion granulation, and obtaining high-impact ABS resin. This invention achieves a significant improvement in the impact resistance of ABS resin by precisely controlling the nanoscale dispersion of the rubber phase, the thickness of the graft layer, and the gradient of the shell composition.

This invention belongs to the field of polyester biodegradable plastics technology, specifically relating to a PBAT / PLA composite biodegradable plastic and its preparation process. This invention aims to solve the problems of poor weather resistance and insufficient mechanical properties in existing PBAT / PLA composite materials. The invention involves preheating PBAT resin particles and then performing melt grafting to obtain modified PBAT; obtaining hydroxyl-terminated PBS through transesterification polycondensation, and further obtaining a triblock compatibilizer through bulk polymerization; acetylifying nanocellulose to obtain a dispersing reinforcing agent, and then melt-blending it with PLA resin particles to obtain a reinforcing masterbatch; reactively blending the modified PBAT, reinforcing masterbatch, and triblock compatibilizer, followed by vacuum drying, to obtain the biodegradable plastic. The biodegradable plastic provided by this invention maintains excellent biodegradability while possessing good mechanical strength.

The application belongs to the field of metal complex catalyst preparation and application, and discloses a kind of tetranuclear β Zinc ketimine complex and synthesis method and application.Tetranuclear β Zinc ketimine complex is applied to catalyze caprolactone ring-opening polymerization, and tetranuclear β Zinc ketimine complex is used as catalyst, caprolactone is used as raw material, under the protection of waterless, oxygenless and inert gas, 110 ℃ bulk polymerization, without solvent and cocatalyst participation, can catalyze caprolactone ring-opening polymerization to prepare polycaprolactone.The catalyst is low toxic, the preparation method is simple, the structure is novel, has good catalytic activity to caprolactone polymerization, the catalyst consumption is low in the catalytic process, and the molecular weight of obtained polymer is high (83893~130186 g / mol).

The present application relates to the field of organic synthesis, and discloses a serotonin molecularly imprinted polymer, a preparation method and application thereof.The molecularly imprinted polymer is prepared by using a bulk polymerization method; in the preparation, a dummy template 5-methoxytryptamine is preassembled with a functional monomer in a solution, then a crosslinking agent and an initiator are added, and the polymerization product is obtained under the protection of inert gas; and after the template molecule is eluted, the serotonin molecularly imprinted polymer is obtained.The present application reduces the preparation cost through the dummy template strategy, and avoids the occurrence of template leakage in application, thereby avoiding the problem of false positive results; meanwhile, the synergistic effect of the bifunctional monomer improves the selectivity.The imprinted factor of the polymer provided by the present application for serotonin can reach 3.54, and the selectivity is excellent and the stability is good; the polymer can be used as a solid-phase extraction adsorbent, and is used for efficient separation, enrichment and detection of serotonin in biological samples (especially urine), and has a good application prospect in the field of biomarker detection related to disease diagnosis.

This invention proposes a bulk polymer-modified high-vibration-resistance and high-impact ABS resin and its preparation method. The method involves mixing and dissolving toughening rubber, solvent, monomers acrylonitrile, acrylate monomers, and styrene monomer to form a raw rubber solution. The raw rubber solution, vibration-damping reinforcing agent, initiator, and chain transfer agent are then fed into four plug flow reactors connected in series for continuous bulk polymerization. The polymerized material is then extruded for devolatilization and granulation to obtain the high-vibration-resistance and high-impact ABS resin. This invention enhances molecular chain flexibility and compatibility by adding monomeric acrylate elastomers and vibration-damping reinforcing agents during continuous bulk polymerization without adding any mechanical performance additives. Simultaneously, it adjusts the monomer composition, controls the polymerization temperature and stirring rate, and adjusts the rubber particle size and the degree of crosslinking of the product. This ensures the mechanical properties of the product while improving the damping performance of the resin and thus enhancing the vibration resistance of the ABS resin.

The application discloses an azobenzene-based heterochain fluorescent polymer and a preparation method and application thereof, and relates to the technical field of heterochain polymer luminescence. The method uses azobenzene epoxide alkane as raw material, and obtains the azobenzene-based heterochain fluorescent polymer through bulk polymerization, melt polymerization or solution polymerization under the action of a catalyst; the azobenzene-based heterochain fluorescent polymer obtained by the method has good solubility in various organic solvents, and the luminescence property of the polymer can be changed by adjusting the concentration and inducing photoisomerization of the azobenzene group, so that the azobenzene-based heterochain fluorescent polymer has good application potential.

The application discloses an N-Boc-L-phenylalanine molecular imprinting polymer and a preparation method and application thereof. The N-Boc-L-phenylalanine molecular imprinting polymer is prepared by using a bulk polymerization method, taking N-Boc-L-phenylalanine as a template molecule and allylamine as a functional monomer, and under the participation of a crosslinking agent and an initiator. The molecular imprinting polymer has specific recognition ability to N-Boc-L-phenylalanine. The maximum adsorption capacity of the molecular imprinting polymer to N-Boc-L-phenylalanine reaches 14.50 mg / g, and the imprinting factor IF value is as high as 10.33. The adsorption amount of the molecular imprinting polymer to N-Boc-L-phenylalanine is significantly higher than that to N-Boc-D-phenylalanine, and the molecular imprinting polymer has good chiral recognition ability. The molecular imprinting polymer can be used for selective recognition, adsorption and enrichment of N-Boc-L-phenylalanine.

The preparation method of bio-based non-isocyanate polyitaconamide urea belongs to the field of polymer synthesis and bio-based green materials. First, dimethyl itaconate is used to react with excess aliphatic diamine through Michael addition and intramolecular cyclization melt polycondensation, a rigid pyrrolidone heterocycle is introduced in situ in the main chain, and an amino-terminated itaconic acid polyamide prepolymer is formed. Subsequently, ethylene carbonate is used as a chain extender to carry out green bulk polymerization process without solvent and catalyst, and a strong hydrogen bonding non-isocyanate urea bond network is efficiently constructed. The present application ingeniously constructs a ternary synergistic system of "rigid heterocycle-strong hydrogen bond-long and short aliphatic chain", and the obtained material has excellent and comprehensive balanced performance.

This invention proposes a matte, low-odor bulk ABS resin and its preparation method. Low-cis polybutadiene rubber, ethylbenzene, styrene, and acrylonitrile are mixed and dissolved to form a raw rubber solution. After filtration and preheating, the raw rubber solution and additives are fed into four plug flow reactors connected in series for continuous bulk polymerization. The polymerized material is then extruded for devolatilization and granulation to obtain the matte, low-odor bulk ABS resin. This invention reduces organic gases in the finished product by modifying the process conditions of conventional matte ABS products and adding a reflux device with an adsorption tank to the fourth reactor of the ABS polymerization unit. Simultaneously, it increases the high-temperature reaction time of some materials to reduce unreacted monomers.

This invention discloses a method for preparing polyester by ring-opening polymerization of cyclic monomers catalyzed by a sodium salt catalyst of urea-amino acids. In the presence of an initiator, the cyclic monomers undergo ring-opening polymerization under the catalysis of a sodium salt catalyst of urea-amino acids as shown in Formula I. After the polymerization reaction, a good solvent is added to the resulting mixture, the mixture is filtered, and the filtrate is slowly added to a precipitation solvent. The mixture is then centrifuged and dried to obtain the polyester. This invention employs a bulk polymerization method, eliminating the need to introduce additional reaction solvents into the reaction system. Furthermore, the high reaction temperature significantly reduces the sensitivity of the reaction system to air and water, which is beneficial for industrial production. This preparation method has significant advantages such as high efficiency, simple operation, and wide applicability. It allows for the controlled synthesis of polyester products with target molecular weights, yielding products with high yields, no monomer residue, and clean appearance.