10results about How to "Uniform polymerization" patented technology

The invention discloses a method for preparing hydrogel through front-end polymerization-3D printing and front-end polymerization type 3D printing ink, and relates to the technical field of functional polymer material preparation. Ink formed by combining Carbomer 940 particle hydrogel, acrylamide and acrylic acid is prepared on the basis of blocking phase change, the printability of the ink is studied, front-end polymerization and a 3D printing technology are combined, a gel precursor solution and Carbomer 940 serve as main components of the 3D printing ink, a front-end polymerization method is adopted, a gel support of a specific structure and morphology is printed, and the 3D printing ink has the advantages of being simple in preparation process, low in cost and high in practicability. A direct ink writing (DIW) technology is coupled with a front-end polymerization reaction, a polymer three-dimensional model is rapidly prepared with minimum energy input, meanwhile, the front-end end face is spread forwards along with the moving track of a printing needle in the printing process, ink is cured into a polymer in situ through high heat release of the polymerization reaction, and the self-supporting capacity of the model is improved.

The invention discloses a gel polymer electrolyte based on sulfuryl electrolyte and a preparation method and application thereof, and the preparation method comprises the following steps: S1, mixing a lithium salt with a sulfuryl organic solvent, and then adding a weak solvation solvent to obtain a basic electrolyte; s2, dissolving a monomer and a free radical initiator in the basic electrolyte to form a precursor solution; and S3, assembling the precursor solution in a battery, and heating at 60-80 DEG C for 4-24 hours to obtain the gel polymer electrolyte. The gel polymer electrolyte prepared by the invention presents a solvation structure which takes lithium salt anions as main components, which is contributed by the weak solvation ability of one of the solvents, and the generated inorganic interface-rich layer is beneficial to stabilizing the phase change of a high-voltage cathode and inhibiting the growth of metal lithium dendrites or the co-intercalation behavior of a graphite cathode at the same time; while good electrochemical stability of a sulfonyl electrolyte with good thermal stability and a high-nickel lithium metal battery system is considered, the construction mode of an anion-rich solvation structure is expanded.

The application discloses a lignin-based conductive eutectic gel and a preparation method and application thereof, and belongs to the technical field of intelligent soft materials.The lignin-based conductive eutectic gel comprises the following components in proportion by weight: 20-50 parts of polymerizable monomers, 0.01-0.2 parts of a crosslinking agent, 0.01-0.15 parts of sodium lignosulfonate, 3-6 parts of modified keratin, 0.1-1 parts of an initiator, 50-90 parts of a deep eutectic solvent and 50-100 parts of water; the polymerizable monomers are acrylic acid and [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide; and the modified keratin is polyethylene glycol-based double-end crosslinking monomers and disulfide di(p-phenylene)di(2-methyl acrylate) grafted modified keratin.The lignin-based conductive eutectic gel has excellent strain sensing performance, can be used for monitoring the movement of different parts of a human body and personal health, and has excellent adhesion performance and can be stably combined with fitness equipment.

The invention discloses a polyetherimide-ultraviolet light absorber composite film and a preparation method and application thereof, and the method comprises the following steps: adding a hydroxyl-containing ultraviolet light absorber into a diamine dispersion liquid to obtain a composite solution; bisphenol A type diether dianhydride is added into the composite solution in batches, stirring reaction is carried out, and composite sol is prepared; and preparing a composite film by using the composite sol, and carrying out imidization treatment on the composite film to prepare the polyetherimide-ultraviolet light absorber composite film. According to the method, a hydroxyl-containing ultraviolet light absorber is introduced, and the hydroxyl-containing ultraviolet light absorber and polyetherimide can form hydrogen bonds, so that chain segments are combined more tightly, molecular chain segments are increased, and relative movement of the chain segments is not easy to generate at high temperature, so that the thermal stability is improved, meanwhile, the weather resistance of the composite material is improved, and the service life of the composite material is prolonged. The method is simple to operate and efficient in reaction, and has wide application value.

The present invention provides a polyether prepared by polymerizing alkylene oxide in the presence of an initiator, an aluminum compound having at least one hydrocarbyl substituent, and a phosphorus-nitrogen base. The molar ratio of the amount of the phosphorus-nitrogen base present to the amount of the initiator is small. The presence of such a small amount of phosphorus-nitrogen base greatly improves the catalytic activity of the system compared to the case where the aluminum compound is used alone. The product polyether has a small amount of unsaturated polyether impurities and little or no unwanted high molecular weight portion. The proportion of primary hydroxyl groups of the propylene oxide polymer is very low.

The invention discloses an SEBS-loaded barium sulfate master batch, a preparation method and a barium sulfate-filled polyolefin elastomer material, the master batch comprises SEBS, barium sulfate and a barium sulfate surface treatment aid, the weight ratio of SEBS to barium sulfate is 1: 0.2-1.5, and the use amount of the barium sulfate surface treatment aid is 2-15 wt% of the weight of barium sulfate powder; the barium sulfate surface treatment auxiliary agent comprises a block copolymer composed of polyethylene glycol monomethyl ether and methyl methacrylate, the molar ratio of polyethylene glycol monomethyl ether to methyl methacrylate is 1: (1-4), and the theoretical molecular weight of the barium sulfate surface treatment auxiliary agent is 300-600. According to the invention, the barium sulfate is subjected to surface treatment in the solution, and the continuous preparation of the SEBS-loaded barium sulfate master batch is realized through the continuous convective mixing of the barium sulfate suspension and the SEBS solution and the continuous removal of the mixed solvent; the master batch can be applied to polyolefin elastomers, and modification of the overall performance of a barium sulfate filled polyolefin elastomer material is achieved.

The invention discloses a preparation method of a barium sulfate pre-dispersed master batch and a barium sulfate filled polyolefin elastomer material, and the preparation method comprises the following steps: (1) preparing a barium sulfate surface treatment auxiliary agent which comprises a block copolymer composed of methoxypolyethylene glycol and methyl methacrylate in a molar ratio of 1: (1-4), and the theoretical molecular weight of the barium sulfate surface treatment auxiliary agent is 300-600; (2) mixing barium sulfate powder with the barium sulfate surface treatment aid, stirring and mixing at a high speed, then putting into a high-temperature environment for binding reaction, and stirring at a high speed to obtain surface-treated barium sulfate powder; and (3) preparing an SEBS solution, adding the barium sulfate powder subjected to surface treatment into the SEBS solution, stirring and mixing, pouring the mixed solution into boiling water to remove the organic solvent to form a master batch, and drying to obtain the barium sulfate pre-dispersed master batch. The method provided by the invention can ensure sufficient dispersion of barium sulfate, better maintain the molecular structure of the carrier polymer, and improve the performance of the barium sulfate filled polyolefin elastomer material.

The present invention relates to the technical field of special engineering plastics, and in particular to a method for preparing a thermotropic liquid crystal polymer, wherein the method comprises the following steps: S1, under the protection of an inert gas and under heating conditions, an aromatic liquid crystal monomer and acetic anhydride are subjected to an acetylation reaction under the action of a catalyst; S2, after the acetylation reaction is completed, a prepolymerization reaction is carried out under the conditions of a heating temperature of 210 to 230°C and a pressure of 1 to 3 MPa, after the reaction is completed, the reaction system is depressurized and the by-products are discharged; S3, after the prepolymerization reaction is completed, the temperature is raised to carry out a melt polymerization reaction; S4, under the conditions of an inert gas, a solid phase polymerization reaction is carried out on the product of step S3 to obtain a thermotropic liquid crystal polymer. The preparation method can solve the sublimation problem of liquid crystal monomers and acetylation products, is simple to operate, saves working hours, reduces the generation of by-products, is convenient for industrial production, and the obtained thermotropic liquid crystal polymer has good thermal stability, mechanical properties and processing properties.

The application discloses a plastic embedding agent Big Cut resin, which is composed of a crosslinking agent and a non-reactive liquid auxiliary agent in a mass ratio of 3:7 to 7:3. The application further discloses a preparation method of the plastic embedding agent, which comprises the steps of mixing the crosslinking agent and the non-reactive liquid auxiliary agent in the mass percentage to obtain a mixture, and adding an initiator into the mixture to obtain the Big Cut resin. The application further discloses a plastic embedding method suitable for thick cutting of a large-volume sample, which embeds a biological tissue sample by using the Big Cut resin. The embedding method can realize uniform and stable polymerization of the large-volume resin, improve the cutting performance of the sample after embedding, meet the thick cutting requirement of an fMOST system, has the advantages of transparent depth imaging and adjustable refractive index, and realizes high-throughput imaging.

This invention belongs to the field of polyether polyol synthesis technology, specifically relating to a bio-based autocatalytic low-temperature stable polyether polyol, its preparation method, and its applications. The polyether polyol comprises the following raw material components in parts by weight: 30-50 parts of a bio-based composite initiator, 40-60 parts of an epoxide monomer, 2-5 parts of an autocatalytic modifier, 1-3 parts of a low-temperature stabilizer, and 0.5-1 parts of an antioxidant. The bio-based content of the polyether polyol of this invention can reach 45-65%, resulting in a low carbon footprint, low odor level, and low irritation. It exhibits no stratification or turbidity after being placed at -20°C for 72 hours, and demonstrates excellent low-temperature fluidity, requiring no additional low-temperature additives. The accompanying preparation method employs a segmented dropwise one-step autocatalytic polymerization process, with mild reaction conditions, eliminating the need for neutralization and washing steps, resulting in a short process flow, low production cost, and minimal waste emissions. It can be widely used in the preparation of low-temperature defoamers, low-temperature polyurethane insulation foams, and polyurethane materials for automotive interiors.