174 results about "Residual monomer" patented technology

The present application discloses a continuous dynamic and efficient devolatilization method for a polymer / volatile system based on high mass transfer interfaces, including the following steps: providing a dynamic single-screw devolatilizer, feeding a polymer solution to the devolatilizer, wherein the polymer solution includes polymer and volatile substances with small molecule weight, and the volatile substances include organic solvents, residual monomers, water or reaction by-products; conveying and compressing polymer materials by the screw downstream a devolatilization section, and extruding the polymer materials out of the dynamic single-screw devolatilizer directly; or providing a side-feeding extruder downstream of the devolatilization section and feeding plastic additives into a devolatilized polymer melt, and then melt blending the plastic additives with the devolatilized polymer melt at an end of the dynamic single-screw devolatilizer before exiting the dynamic single-screw devolatilizer.

The invention discloses a preparation method of EVOH, and relates to the technical field of EVOH. According to the method, a low-temperature (0-5 DEG C) methanol-n-hexane mixed solvent system is creatively adopted and matched with a penetration enhancer to realize synergistic extraction, so that synchronous and deep removal of polar and non-polar small molecular impurities in the EVA is finally realized, the content of impurities in the EVA is remarkably reduced, and the self-polymerization reaction of residual monomers is effectively inhibited; therefore, a key guarantee is provided for subsequent preparation of high-quality EVOH products. The film processed by the EVOH prepared by the invention has the characteristics of few crystal points and high product quality, and can be applied to the field of high-barrier packaging film materials.

The invention discloses a binder for a lithium battery diaphragm cold pressing process and a preparation method thereof, and relates to the technical field of lithium battery diaphragm binders, the binder is prepared from the following components: an acid monomer, an amide monomer, a nitrile monomer, an acrylate monomer, an ether bond-containing polyfunctional group monomer, a long side chain hydrocarbon chain monomer, a neutralizer and an initiator. The preparation method comprises the following steps: mixing the binder components, and adding the binder components into deionized water to form a mixed solution; adding an initiator under the protection of nitrogen, and heating for reaction; and after the reaction is finished, adding a neutralizer to adjust the pH value, diluting and vacuumizing to remove residual monomers. The ether bond-containing polyfunctional group monomer is introduced to form a three-dimensional network structure, so that cohesion is reduced, and a dry film is soft and adapts to a 25 DEG C cold pressing process; and meanwhile, a long-side-chain hydrocarbon chain monomer is introduced, so that the compatibility and wettability with the PE / PP diaphragm are improved, and low-energy-consumption cold pressing bonding is realized.

The invention belongs to the technical field of lithium ion batteries, and relates to a gel electrolyte based on in-situ polymerization and a preparation method of a lithium ion battery. The preparation method comprises the following steps: adding a cross-linking monomer with a structure with more than three arms and a polyfluorinated acrylate monomer into an electrolyte, and adding an initiator to obtain a monomer solution; then injecting into the lithium ion battery, placing and aging to enable the monomer solution to fully infiltrate a positive plate, a negative plate and a diaphragm; and performing thermal polymerization on the aged battery cell in situ to obtain the gel electrolyte lithium ion battery based on in-situ polymerization. According to the invention, a polymethylacrylic acid based gel electrolyte is prepared by using a method of in-situ polymerization of a polyfluorine monomer with interface film-forming characteristics and polymerization characteristics and a multi-arm cross-linking monomer with high polymerization activity; wherein the monomer with double characteristics can participate in polymerization, and the residual monomer can serve as an interface film-forming additive, so that more LiF is formed in a solid electrolyte membrane of a negative electrode and a positive electrode-electrolyte phase, and the interface stability is enhanced.

The invention relates to the technical field of detection, and discloses a method for detecting the content of residual monomers in synthetic resin emulsion. The method comprises the following steps: carrying out gas chromatographic analysis I on a standard solution containing at least 10 residual monomer standard substances to respectively obtain the chromatographic peak area yi of each residual monomer standard substance in the standard solution; defining the mass concentration of each residual monomer standard substance in the standard solution as xi, and establishing a curvilinear equation of yi and xi as an equation I: yi = ki * xi + bi; performing gas chromatographic analysis II on the synthetic resin emulsion to-be-detected solution to respectively obtain the chromatographic peak area Ai of each residual monomer in the to-be-detected solution; and calculating the content of each residual monomer in the synthetic resin emulsion according to an equation II: X% = (Ai-bi) / ki * V / (Mx106) * 100%. The method provided by the invention is high in accuracy, good in recovery rate and low in detection limit.

The invention provides a high-strength anti-ultraviolet regenerated PET fiber and a preparation method thereof. The preparation method comprises the following steps: in a nitrogen atmosphere, dissolving 2, 2 '-methylenebis [6-(benzotriazolyl)-tetramethylbutylphenol] and hexamethylene diisocyanate in N-methyl pyrrolidone, adding a catalyst for reaction, then heating to remove residual monomers, cooling, dropwise adding into ice methanol to separate out a product, washing, and carrying out vacuum drying to obtain an anti-ultraviolet auxiliary agent; the preparation method comprises the following steps: dissolving an anti-ultraviolet aid and hexamethylenediamine in an aprotic solvent, adding a catalyst, carrying out condensation reaction in a nitrogen atmosphere, and carrying out centrifugal washing and vacuum drying to obtain the anti-ultraviolet composite chain extender, the preparation method comprises the following steps: mixing an anti-ultraviolet composite chain extender with recycled PET fragments, adding an antioxidant, a hydrolysis-resistant solution and a lubricant, and carrying out blending spinning through a double-screw extruder to obtain the high-strength anti-ultraviolet regenerated PET fiber. According to the invention, through anti-ultraviolet-chain extension chemical bonding, the bottleneck that the strength and the function of the regenerated PET fiber are difficult to synergistically improve is broken through.

The invention discloses a method for continuously and hermetically preparing high-molecular water-absorbent resin at normal temperature and pressure, and belongs to the technical field of preparation of high-molecular water-absorbent resin. The invention provides a method for continuously and hermetically preparing high-molecular water-absorbent resin at normal temperature and pressure. The method comprises the following steps: step 1, preparing a reaction solution; step 2, continuously filling the reaction liquid into a plastic film bag, and forming a continuously produced first prefabricated body; and step 3, continuously carrying out closed polymerization reaction on the reaction liquid in the film bag through UV radiation. According to the method, the high-molecular water-absorbent resin is prepared in a closed and continuous manner in a normal-temperature and normal-pressure environment, heating and pressurizing equipment is not needed, and no gas is discharged outwards in the preparation process; on one hand, the product preparation cost is reduced; on the other hand, cleanliness, safety and stability in the preparation process are guaranteed. In addition, the continuous preparation method can greatly improve the preparation efficiency and the preparation scale of the product, and the product is high in monomer conversion rate, low in residual monomer and excellent in water absorption performance.

The invention relates to a continuous purification method of a sulfone polymer, and belongs to the field of post-treatment of high-molecular polymers. The method comprises the following steps: 1) centrifuging a sulfone-containing polymer suspension, removing a liquid phase from a solvent recovery system, feeding a solid phase into a purification device, washing and purifying under the action of a compound solvent and ultrasonic waves, and reducing residual monomers in the polymer to below 50ppm; and 2) carrying out multi-stage centrifugation-washing, sending the centrifuged solid phase into a leaching system, settling, contacting with desalted water to obtain a sulfone polymer material, reducing the concentrations of the organic solvent, the inorganic salt and the like to below 50ppm, mixing the sulfone polymer material with water, and sending the mixture into a subsequent polymer drying system. The method provided by the invention is simple in process and high in automation degree, greatly reduces the equipment investment and operation cost, saves the solvent and water, has low and stable residual monomer, solvent and inorganic salt content in the product, and has a wide application prospect as a post-treatment method for large-scale sulfone polymer purification / washing and the like.

The invention provides a preparation method of ethylene-vinyl alcohol copolymer resin capable of simultaneously improving bending resistance (flexibility), secondary processability and secondary processing yellowing resistance of a product, which comprises the following steps: taking a solvent, a vinyl acetate monomer, an initiator and an ethylene monomer as raw materials; the ethylene-vinyl alcohol copolymer is prepared through the steps of initial feeding, polymerization reaction, residual monomer blowing-out and alcoholysis. The initial charging stage comprises the following steps: simultaneously adding a vinyl acetate monomer and a solvent, and then respectively introducing nitrogen and ethylene to enable the pressure in a kettle to be 5-30bar and the temperature to be 55-64 DEG C for replacement for multiple times; and adding an initiator after the replacement is completed, filling ethylene to enable the pressure in the polymerization kettle to be 25-50 bar, mixing for 10-20 minutes at normal temperature, and then heating to start polymerization reaction. The ethylene-vinyl alcohol copolymer product disclosed by the invention is excellent in bending resistance (flexibility), better in secondary processing yellowing resistance and fewer in crystal points, and can better meet higher requirements of industrial production and specific fields on the ethylene-vinyl alcohol copolymer product.

The invention discloses a multi-stage devolatilization process method for optical-grade PMMA (polymethyl methacrylate), which comprises four stages of devolatilization stages, specifically, a first-stage flash devolatilization stage, a second-stage vacuum devolatilization stage, a third-stage high-vacuum devolatilization stage and a fourth-stage high-temperature low-vacuum short-distance devolatilization stage. According to the multi-stage devolatilization process method of the optical-grade PMMA, deep devolatilization can be carried out on the PMMA resin, and the obtained PMMA resin has low haze and low residual monomer amount.

The invention discloses a low-cost ammonia-free waterproof emulsion as well as a preparation method and an application method thereof, and belongs to the technical field of cement coatings. Comprising the following steps: mixing and stirring an emulsifier, a monomer and deionized water to obtain a pre-emulsion; adding deionized water into the reaction kettle to obtain a kettle bottom material; adding 0.9% of the pre-emulsion and an initiator a into the kettle bottom material in a stirring state, dropwise adding the rest of the pre-emulsion and the initiator b at the same time after 15 minutes, controlling the pre-emulsion and the initiator b to be dropwise added at the same time, and keeping the temperature after dropwise adding is finished; adding an oxidizing agent and a reducing agent to eliminate residual monomers, then adding a neutralizing agent to adjust the pH value, and adding an auxiliary agent; wherein the emulsifier comprises an anionic emulsifier and a nonionic emulsifier in a mass ratio of (2-3): 1; the monomers comprise styrene, butyl acrylate and functional monomers, and the functional monomers are hydroxyethyl acrylate and beta-acryloyloxypropionic acid. The low-cost ammonia-free polymer cement waterproof coating prepared from the emulsion disclosed by the invention has the advantages of low cost, environmental friendliness, good constructability and excellent mechanical properties.

The invention relates to a method for reducing the content of residual monomers in a polymer composition, the polymer composition, a composition capable of free radical polymerization, a polymer preparation method, a polymer and application.

A super-wet surface is a polypropylene surface, on which a hydrophilic side group is grafted, having a micro-nano structure. The super-wet surface is at least super-hydrophilic and does not contain an initiator residue. The super-wet surface is prepared by grafting, in the absence of an initiator, by means of microwave irradiation, a monomer for forming a side group, on the polypropylene surface, as a grafting base, having a micro-nano structure. In the preparation of the super-wet surface, the molecular weight of polypropylene does not decrease after grafting, there is no residual monomer or initiator residue, and the super-wetting effect of the obtained surface is lasting and stable. The super-wet surface can be used in bonding, spraying, oil-water separation, water treatment, biology, medicine and energy fields.

The present invention relates to a process for preparation of an ABS graft copolymer. The process comprises (i) grafting a butadiene latex with a gel content in a range from 75% to 90% with a first portion of acrylonitrile and styrene monomers in a percentage ratio in a range from 1.4 to 1.6, in presence of an initiator- 1 and a molecular weight regulator, carrying out the polymerization for 0.5 hours to 1.5 hours, (ii) adding a second portion of acrylonitrile and styrene, additional initiator- 1 and molecular weight regulator to step (i), and continuing polymerization for 3 hours to 5 hours, and (iii) additionally adding the initiator- 1 or an initiator-2 to step (ii), and continuing polymerization for 1 hour to 2 hours. The feeding pattern of monomers in the process provides a high polymerization rate and thereby reduces residual monomer content.

To provide a method for obtaining, from used water-absorbing resin, a regenerated water-absorbing resin composition that is less degraded and has less coloring and fewer impurities or residual monomers, without excessively consuming resources during recycling.SOLUTION: A method for producing a regenerated water-absorbing resin composition using used water-absorbing resin or its solubilized material as part or all of raw materials comprises: performing azeotropic dehydration (first drying) of a water-containing gel-like crosslinked polymer in the presence of a surfactant or a polymer dispersant in a hydrophobic organic solvent so as to obtain a water-containing gel-like crosslinked polymer with a water content from 5 mass% to 50 mass% inclusive; separating the hydrophobic organic solvent and the water-containing gel-like crosslinked polymer (semi-dried gel) by filtration or evaporation to dryness; and drying by heating under stirring (second drying) to obtain a dried polymer with a water content from 1 mass% to 20 mass% inclusive.SELECTED DRAWING: Figure 1

The application discloses a preparation process of high-adhesion EB electron beam curing display cover plate ink, and relates to the technical field of ink preparation. The process uses high-functionality acrylate monomers, polyurethane acrylate prepolymers and an interface coupling agent as main components, realizes excellent adhesion and abrasion resistance to glass and plastic substrates through electron beam irradiation and rapid curing, and meets the requirement of high light transmittance. The process overcomes the problems of insufficient adhesion and high residual monomer of the existing EB curing ink, improves the comprehensive performance of the EB curing ink, and is suitable for the field of high-end display cover plate printing and manufacturing.

[Problem] The present invention addresses the problem of providing a method capable of removing, in an efficient and simple manner, residual monomer from a reaction solution after polymerization, particularly a latex solution after emulsion polymerization, while avoiding generation of undesirable polymer aggregate. [Solution] The present inventors discovered that residual monomer in a post-reaction polymer solution, such as a latex solution, can be efficiently removed by irradiating the solution with microwaves.

The invention discloses an amphiphilic disulfide and a preparation method and application thereof, and belongs to the technical field of emulsion polymerization, the disulfide has the following structural general formula (I), in the formula (I), R1 is C1-C6 straight chain or branched chain alkyl; r2 is C2-C6 straight chain or branched chain alkyl; M1 is alkali metal ion or NH4 < + >; and M2 is alkali metal ion. A redox system formed by the disulfide and an oxidizing agent is used for post-treatment of a polymerized emulsion, residual monomers and free radicals in the emulsion can be efficiently cleared in a targeted mode, excellent emulsion stability is kept, and formaldehyde is not released.

The invention discloses a low-water-absorption alkali-resistant waterproof emulsion as well as a preparation method and an application method thereof, and belongs to the technical field of cement coatings. Comprising the following steps: preparing a pre-emulsion, namely mixing and stirring an emulsifier, a monomer and deionized water for 30 minutes to obtain the pre-emulsion; preparing a kettle bottom material: adding deionized water into the reaction kettle to obtain the kettle bottom material; 3% of the pre-emulsion and an initiator a are added into a kettle bottom material in a stirring state, after 15 min, the remaining pre-emulsion and an initiator b are dropwise added at the same time, the pre-emulsion and the initiator b are controlled to be dropwise added at the same time, the dropwise adding temperature is controlled to be 83-85 DEG C, the total dropwise adding time is 4 h, and heat preservation treatment is conducted after dropwise adding is completed; an oxidizing agent and a reducing agent are added to eliminate residual monomers, then a neutralizing agent is added to adjust the pH value, an auxiliary is added, and the low-water-absorption alkali-resistant polymer cement waterproof emulsion is obtained, and the low-water-absorption alkali-resistant polymer cement waterproof coating prepared from the emulsion has low water absorption and alkali resistance and also has excellent mechanical properties.

The application discloses a kind of binder for lithium battery separator cold pressing process and preparation method thereof, it is related to lithium battery separator binder technical field, binder includes the following component is made: acid monomer, amide monomer, nitrile monomer, acrylic ester monomer, ether bond containing multifunctional monomer, long side chain hydrocarbon chain monomer, neutralizing agent, initiator.Preparation method includes the following steps: after mixing binder component, it is formed into mixed solution in deionized water;Nitrogen protection is added to initiator, heating reaction;After reaction is completed, neutralizing agent is added to adjust pH value, dilution and vacuum removal residual monomer are obtained after.The application forms three-dimensional network structure by introducing ether bond containing multifunctional monomer, reduces cohesion, makes dry film soft, adapts 25 DEG C cold pressing process;While introducing long side chain hydrocarbon chain monomer improves compatibility and wettability with PE / PP separator, realizes low energy consumption cold pressing bonding.

The application relates to the technical field of oilfield chemicals, and discloses a temperature-resistant and salt-resistant cationic hydrophobic association polymer as well as a preparation method and application thereof. Components of the polymer are acrylamide, N,N-dimethyl-N-methyl acryloyloxyethyl-N-2-hydroxy-1-octadecylamino propyl ammonium chloride, ammonium persulfate, sodium bisulfite, a fatty alcohol polyoxyethylene ether and a solvent. The application chemically synthesizes specific amounts of acrylamide, N,N-dimethyl-N-methyl acryloyloxyethyl-N-2-hydroxy-1-octadecylamino propyl ammonium chloride, ammonium persulfate, sodium bisulfite and the fatty alcohol polyoxyethylene ether, and can prepare the polymer with high thickening efficiency. The polymer has good thickening performance, a small critical association concentration, excellent temperature resistance and salt resistance, and can be applied to unconventional oilfields. The product produced by the preparation method has low residual monomer content, the preparation process is simple, the cost is low, the operation is easy, the pollution is small, and the product is easy to be industrially produced.

This invention provides a continuous, dynamic, and efficient defloration method for polymer / volatile component systems based on high mass transfer interfaces. [Solution] The method includes the steps of adding a polymer solution to a single-screw dynamic defoliation apparatus, wherein the polymer solution contains a defoliated polymer and volatile small molecule substances, the volatile small molecule substances containing an organic solvent, residual monomer, water, or reaction by-products, and after the material in the defoliation section is defoliated, it is conveyed and compressed by a screw and then removed from the single-screw dynamic defoliation apparatus, or providing a side-feed extruder downstream of the defoliation section, adding a plastic additive to the defoliated polymer molten body, melting and mixing it with the defoliated polymer molten body at the end of the single-screw dynamic defoliation apparatus, and then removing it from the dynamic defoliation apparatus.

The invention provides a low-precipitation high-transparency high-toughness polyamide material as well as a preparation method and application thereof. The polyamide material comprises polyamide and a specific small molecule capturing agent. According to the low-precipitation, high-transparency and high-toughness polyamide material disclosed by the invention, residual monomers and oligomers of polyamide are reduced in the production process, so that the precipitation resistance problem is obviously improved, the high transparency of the material is maintained, the low-temperature toughness resistance is realized, and the application range in the fields of medium storage and transportation can be widened.

The invention discloses a method for detecting residual monomers in vinyl chloride-vinyl acetate copolymer resin, which comprises the following steps: S1, filling an external standard solution into a headspace sample bottle, sealing, detecting by adopting HS-GC-MS, and drawing a content-peak area standard curve of a target monomer by adopting an external standard method; s2, mixing to-be-detected vinyl chloride-vinyl acetate copolymer resin with a solvent A, dissolving the to-be-detected vinyl chloride-vinyl acetate copolymer resin to obtain a to-be-detected solution, detecting the to-be-detected solution by adopting HS-GC-MS, and calculating the content of a target monomer in the to-be-detected vinyl chloride-vinyl acetate copolymer resin by combining the peak area of the target monomer and the content-peak area standard curve, by adopting HS-GC-MS, the volatile residual monomer to be detected is firstly subjected to mass spectrum qualitative recognition, and then quantitative analysis is carried out on the basis of qualitative confirmation; the method can synchronously realize quantitative determination of the vinyl chloride monomer and the vinyl acetate monomer in one-time detection.

The invention provides a method for detecting the concentration of residual monomers in (methyl) acrylic resin. According to the detection method, the residual monomers in the (methyl) acrylic resin can be accurately, rapidly and effectively separated, and the concentration of the residual monomers can be quantitatively analyzed; according to the detection method, a thermal analyzer is combined with a temperature programmed injection port-gas chromatography (PTV-GC), so that the influence of high-temperature decomposition of the (methyl) acrylic resin on the concentration of the residual monomer can be well reduced within a detection limit range, and a test structure of the concentration of the residual monomer is more accurate and stable.

The present invention relates to a method comprising the steps of: a) contacting styrene and an ethylenically unsaturated monomer under emulsion polymerization conditions to form an aqueous dispersion of styrenic copolymer particles and residual monomers; and b) contacting the dispersion of the styrenic copolymer particles with a reductant and a t-C4-C10-alkyl hydroperoxide to reduce the concentration of residual monomers in the aqueous dispersion to less than 1000 ppm of residual monomers; wherein the mole-to-mole ratio of the t-C4-C10-alkyl hydroperoxide to reductant is in the range of from 3:1 to 50:1. The method of the present invention provides a way of preserving a styrenic latex even in the absence of a biocide.

The invention discloses a method for continuously and hermetically preparing high-molecular water-absorbent resin at normal temperature and pressure, and belongs to the technical field of preparation of high-molecular water-absorbent resin. The invention provides a method for continuously and hermetically preparing high-molecular water-absorbent resin at normal temperature and pressure. The method comprises the following steps: step 1, preparing a reaction solution; step 2, continuously filling the reaction liquid into a plastic film bag, and forming a continuously produced first prefabricated body; and step 3, continuously carrying out closed polymerization reaction on the reaction liquid in the film bag through UV radiation. According to the method, the high-molecular water-absorbent resin is prepared in a closed and continuous manner in a normal-temperature and normal-pressure environment, heating and pressurizing equipment is not needed, and no gas is discharged outwards in the preparation process; on one hand, the product preparation cost is reduced; on the other hand, cleanliness, safety and stability in the preparation process are guaranteed. In addition, the continuous preparation method can greatly improve the preparation efficiency and the preparation scale of the product, and the product is high in monomer conversion rate, low in residual monomer and excellent in water absorption performance.

The invention relates to the technical field of high polymer material processing, and discloses a supercritical CO2 assisted devolatilization and microcellular foaming integrated method for preparing optical-grade PMMA (polymethyl methacrylate), which comprises the following steps: conveying a PMMA prepolymer containing a residual methyl methacrylate monomer into a high-pressure reaction kettle to be in contact with supercritical CO2 and saturated; then, the saturated melt is subjected to rapid pressure reduction, CO2 dissolved in the melt is separated out to form a micropore structure, and residual monomers are synchronously brought out; and cooling and shaping to obtain the optical-grade PMMA material. By adopting the method disclosed by the invention, integrated preparation of efficient removal of PMMA residual monomers and micropore lightweight forming can be realized at a lower processing temperature, and the obtained material has lower residual monomer content, lower density, higher light transmittance and lower haze.

The application provides a branched structure toughening agent and a preparation method and application thereof, and relates to the technical field of polymer modification, and particularly relates to a branched structure toughening agent and a preparation method and application thereof. The branched structure toughening agent is prepared by mixing an aromatic vinyl monomer, an acrylic ester monomer, an initiator and water, and then heating and polymerizing to obtain an intermediate; and then mixing the intermediate with a polyolefin elastomer, an initiator and an antioxidant, and then performing double-screw extrusion granulation. Compared with the existing linear structure toughening agent, the branched structure toughening agent has a larger free volume and a higher toughening efficiency; compared with the core-shell structure toughening agent, the preparation method is simpler, and the structure has a large degree of freedom. The branched structure toughening agent has the advantages of no need of using a solvent, less investment, easy acquisition of equipment, less discharge of a process route, simple process control, low residual monomer content of a product, stable composition, simple use of the product, and wide application in toughening modification of polylactic acid, polyester and polyamide materials, and wide use in medical treatment, packaging, household appliances, automobiles, aviation and other fields. The branched structure toughening agent has a very wide application prospect and industrial value.

The invention discloses lignin alcohol ether, an emulsification system composition containing the lignin alcohol ether as well as a preparation method and application of the emulsification system composition. The lignin alcohol ether disclosed by the invention is obtained by sequentially reacting phenolated modified lignin with raw materials including epoxy haloalkane and polyhydric alcohol. The emulsification system composition comprises span and lignin alcohol ether. The emulsion system composition containing lignin alcohol ether can be applied to the inverse emulsion synthesis process of acrylamide polymers and can well emulsify and stabilize a polymerization reaction system, and the obtained emulsion product has the characteristics of low gel content, higher molecular weight, better long-term storage stability, lower residual monomer content and higher dissolution rate. According to the emulsification system, the production cost of the acrylamide polymer emulsion is reduced, the performance and economical efficiency requirements of site construction can be met, and the practicability is relatively high.