42 results about "Methyl vinyl ether" patented technology

The invention provides perfluorosulfonic acid resin and a polymerization method. The polymerization method comprises the following steps: mixing perfluoromethyl vinyl ether, perfluorosulfonyl fluoride vinyl ether and a fluorine-containing solvent to obtain a mixed solution; and adding an initiator into the mixed solution, introducing a tetrafluoroethylene monomer, carrying out a copolymerization reaction, carrying out solid-liquid separation, and carrying out transformation and drying to obtain the perfluorinated sulfonic acid resin. The perfluoromethyl vinyl ether monomer is introduced into a copolymerization system, so that the rigidity of a polymer main chain is effectively reduced, and the flexibility and low-temperature mechanical strength of the resin are enhanced; the crystallinity is effectively reduced, the Tg is adjusted, and the catalyst is suitable for low-temperature proton exchange membrane fuel cells and other application scenes; the introduction of perfluoromethyl vinyl ether improves the compatibility between the main chain and the sulfonyl fluoride-containing side chain, and is beneficial to the formation of a clearer and more continuous hydrophilic / hydrophobic microphase separation structure. A stable proton conduction network is facilitated, and the electrochemical performance of the resin under harsh working conditions is remarkably improved.

The application belongs to the technical field of sodium ion batteries, and particularly relates to a binder composition, a sodium ion battery positive electrode slurry and a sodium ion battery. The binder composition comprises 0.5-100% and 0-99.5% of a first binder and a second binder by mass percentage, the first binder is one or more of polyacrylic acid, polymethacrylic acid, poly-methyl-vinyl-ether-copoly-maleic acid, and the second binder is one or more of polyvinylidene fluoride, polyacrylonitrile-based binder, polyurethane-based binder and polyimide-based binder. A high-molecular polymer containing a carboxyl group (-COOH) is used as a binder composition component to prepare the sodium ion battery positive electrode slurry. The carboxyl group can be neutralized with alkaline substances in the positive active material of the sodium ion battery positive electrode slurry, so as to ensure the uniformity and fluidity of the positive electrode slurry, to obtain a uniform sodium ion battery positive electrode sheet, and to obtain a sodium ion battery with good electrochemical stability.

The invention relates to the technical field of oral care materials, and particularly discloses macromolecular hydrogel-based false tooth safety paste and a preparation method thereof. The macromolecular hydrogel-based denture safety paste is prepared from the following components in parts by weight: 10 to 20 parts of white oil, 20 to 40 parts of vaseline, 40 to 60 parts of polydopamine modified polyvinyl alcohol-based hydrogel, 20 to 40 parts of sodium carboxymethyl cellulose, 20 to 40 parts of methyl vinyl ether-maleic anhydride copolymer calcium sodium salt, 0.1 to 1 part of silicon dioxide, 0.1 to 1 part of 93 to 98 percent ethanol, 0.05 to 1 part of preservative, 0.1 to 2 parts of essence and 0.001 to 0.01 part of pigment. The polydopamine modified polyvinyl alcohol-based hydrogel is prepared from polyvinyl alcohol, dopamine hydrochloride, an activating agent, a coupling agent and poloxamer. According to the technical scheme provided by the invention, the prepared false tooth fixing paste has excellent properties of good bonding effect and strong durability.

A method to manufacture a test strip for measuring specific gravity of a urine sample, the method including successively providing a polyelectrolyte in a first solution, the polyelectrolyte being poly(methyl vinyl ether-alt-maleic anhydride), adding to the first solution a base to neutralize the polyelectrolyte and to bring the first solution at a pH between 10 and 11, adding to the first solution a buffering agent to bring and maintain the first solution at a pH between 7.0 and 7.5, dipping a paper strip into the first solution, and dipping the paper strip into a second solution comprising a pH sensitive color indicator.

The application discloses a kind of high-temperature-resistant perfluoroether elastomer composition and preparation method, and the preparation method of high-temperature-resistant perfluoroether elastomer composition includes the following steps: S1, predetermined proportion of tetrafluoroethylene, perfluoromethyl vinyl ether, non-conjugated fluorine diene sulfur point monomer and phenyl-containing perfluorodiene sulfur point monomer and peroxide initiator emulsion polymerization obtain perfluoroether elastomer emulsion;S2, perfluoroether elastomer emulsion is condensed, washed, dried, and perfluoroether elastomer micro powder is obtained;S3, perfluoroether elastomer micro powder is mixed with predetermined proportion of filler, acid absorbent, vulcanizing agent and thin passage, and perfluoroether elastomer mixing rubber is obtained;S4, perfluoroether elastomer mixing rubber is molded by mould pressing, and secondary vulcanization obtains high-temperature-resistant, water-vapor-resistant perfluoroether elastomer composition.The perfluoroether elastomer composition prepared by the application has the characteristics of high-temperature resistance, water-vapor resistance and low compression permanent deformation.

The invention discloses a method for polymerizing a perfluoroether elastomer in supercritical carbon dioxide, the perfluoroether elastomer prepared by the method and a composition, the method comprises the following steps: adding carbon dioxide, a perfluoromethyl vinyl ether monomer and a tetrafluoroethylene monomer into a reactor, the carbon dioxide concentration in the reactor being greater than or equal to 30 mol%; and continuously adding the initiator, the chain transfer agent and the vulcanization point monomer to initiate the polymerization reaction of the perfluoroether elastomer. The reactor adopts a jacketed heat exchanger, combines spraying of a liquid tetrafluoroethylene monomer and perfluoromethyl vinyl ether and carbon dioxide reflux to supplement cold energy, utilizes latent heat of vaporization to absorb heat released by polymerization reaction, and controls the reaction temperature to be 35-125 DEG C. The perfluoroether elastomer prepared by the method has good thermal stability, and is suitable for industrial production. The preparation method has the advantages of simple process, chemical corrosion resistance and low fluorine ion extraction degree, and the temperature in the preparation process is accurately controlled, so that unstable end groups of the obtained perfluoroether elastomer are greatly reduced, and various physical properties of the elastomer are favorably improved.

The application relates to the field of polishing processing materials for metal pieces, and particularly discloses a fluid material for polishing metal pieces and a preparation method thereof. The fluid material for polishing metal pieces is prepared from the following raw materials in parts by weight: 20-30 parts of hydroxyl-terminated polydimethylsiloxane, 42-50 parts of abrasive, 18-28 parts of ethanol, 5-8 parts of a lubricating stabilizer, and 2-4 parts of a methyl vinyl ether / maleic anhydride copolymer. The preparation method comprises the following steps: the lubricating stabilizer and the methyl vinyl ether / maleic anhydride copolymer are added into the ethanol and stirred and dispersed, the hydroxyl-terminated polydimethylsiloxane and the abrasive are added and heated and kneaded and dispersed, and vacuum defoaming is performed. The fluid material prepared by the application is applied to polishing of metal pieces, has good temperature resistance and viscosity stability during the polishing process, the polished metal piece surface has good uniformity, the problem that the fluid material is prone to local non-uniformity or scratches during the polishing process is solved, and the polishing efficiency is improved.

The invention provides a fluororubber sealing element applied to a high-temperature dynamic sealing environment and a preparation method of the fluororubber sealing element, and relates to the field of fluororubber preparation. A vinylidene fluoride / tetrafluoroethylene / perfluoromethyl vinyl ether ternary fluoroelastomer is used as a main body material, carbon black is added, and PFA micro powder activated by a plasma etching machine is used as filler; oxygen-containing groups can be introduced after plasma treatment, the interface bonding effect of the PFA and the fluororubber can be improved, meanwhile, the surface energy of the activated PFA can be closer to that of the fluororubber, a nanoscale rough structure can be generated on the surface of the PFA due to etching, the material bonding strength is improved, the sealing performance and the thermal durability are improved, and the layering risk at the high temperature can be inhibited through strong interface bonding; according to the invention, perfluoropolyether oil (PFPE) is added, and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane (bis (penta)), octadecylamine, zinc oxide and a graphene derivative are matched, so that the high-temperature-resistant hot-tear-resistant sealing element is prepared.

The invention relates to the technical field, and discloses a preparation process of a perfluoroether elastomer, which comprises the perfluoroether elastomer. The perfluoroether elastomer is prepared through ternary polymerization of 1, 1-difluoroethylene (VDF), perfluoromethyl vinyl ether (PMVE) and 3-hydroxy-2-trifluoromethyl propionic acid (MAF-OH), a self-made hydroxyl-containing third monomer MAF-OH is introduced, a polar group is successfully introduced into a fluoroelastomer molecular chain, and the polarity and compatibility of a polymer are effectively improved; the prepared perfluoroether elastomer is white powder, has excellent elasticity, high temperature resistance and chemical medium resistance, and has wide application prospects in the fields of preparation of high-end sealing materials, gaskets, rubber tubes and the like.

The application discloses rigid polyurethane foam, a preparation method and a refrigeration appliance, comprising: a combined polyether; isocyanate; foaming agent I, the foaming agent I is one of cyclopentane and isopentane or a mixture composed of cyclopentane and isopentane in any proportion; foaming agent II, the foaming agent II is one of pentafluoropropane and trifluoro-chloro-propylene or a mixture composed of pentafluoropropane and trifluoro-chloro-propylene in any proportion; and foaming agent III, the foaming agent III adopts perfluoromethyl vinyl ether. By adding perfluoromethyl vinyl ether as a foaming agent, the application overcomes the foam cavity problem of a low-boiling-point foaming system, reduces the foam molding density, improves the supporting capacity of low-density rigid polyurethane foam, and has low cost and high practicability.

The application belongs to the technical field of sodium ion battery materials, and particularly relates to a sodium ion battery water-based binder and a positive electrode slurry thereof. Poly[(methyl vinyl ether)-(maleic acid)] is hydrolyzed in a sodium hydroxide solution, and poly[(methyl vinyl ether)-(sodium maleate)] is obtained after vacuum drying, which is used as a water-based binder for a sodium ion battery positive electrode. The water-based binder has both high-polarity groups and low-polarity groups, thus solving the problem of easy settlement of conductive carbon in the water-based binder, ensuring high adhesion between components, and enhancing the volume expansion relief and repair capacity of the water-based binder during the charging and discharging process of the positive electrode sheet compared with PVDF and other binders. In general, the water-based binder has strong adhesion, repair force and interface adaptability, is environment-friendly and low in cost, and can make P2-Na x The MO2 positive electrode material has good energy density and stable cycle characteristics when used in a sodium ion battery.

The application provides a preparation method of hydrophobic modified perfluoro ether elastomer, and applies to the technical field of perfluoro ether elastomer, and comprises the following steps: S1, mixing fluorine-containing vinyl cross-linkable fluorocarbon surfactant and ethylene glycol monomethyl ether, and stirring to obtain a composite dispersed microemulsion; S2, adding deionized water and vulcanization point monomer to the composite dispersed microemulsion, and stirring to form an emulsion; S3, adding perfluoromethyl vinyl ether and an initiator, and introducing tetrafluoroethylene gas to perform polymerization reaction, so as to obtain a perfluoro ether elastomer emulsion; S4, performing demulsification treatment, washing after acidification by concentrated sulfuric acid, and performing hydrophobic modification, so as to obtain hydrophobic modified perfluoro ether elastomer micro powder; and S5, mixing, mold pressing and secondary vulcanization are sequentially performed on the hydrophobic modified perfluoro ether elastomer micro powder, so as to obtain a hydrophobic modified perfluoro ether elastomer sealing product. According to the application, the perfluoro ether elastomer with low viscosity can be prepared, and the pollution of the fluorine-containing surfactant to the environment is reduced.

The invention discloses a method for industrially and continuously producing perfluoromethyl vinyl ether, which comprises the following steps: (1) introducing perfluoro-2-methoxypropionyl fluoride into a first fluidized bed filled with solid carbonate, reacting to obtain alkali metal intermediate salt, and cracking the alkali metal intermediate salt to obtain a perfluoromethyl vinyl ether product flow; (2) the perfluoromethyl vinyl ether product flow enters a separator, gas obtained through separation is compressed and rectified to obtain a perfluoromethyl vinyl ether product and carbon dioxide gas, and the carbon dioxide gas returns to the first fluidized bed to serve as carrier gas; discharging reacted and carbonized solid carbonate from the bottom of the first fluidized bed into a second fluidized bed; and (3) regenerating the reacted and carbonized solid carbonate in the second fluidized bed and then returning to the first fluidized bed. The method disclosed by the invention is an industrial continuous production process and has the advantages of simplicity in operation, high reaction yield, high product purity, high economical efficiency, environment friendliness and the like.

A tetrafluoroethylene-propylene copolymer with a solidification point monomer is mixed with a five-membered copolymer of vinylidene fluoride (VDF), hexafluoropropylene (HFP), tetrafluoroethylene (TFE), perfluorinated methyl vinyl ether (PMVE), and ethylene (PE), using a peroxide as an initiator and an aid TAIC as a crosslinking agent, and the resulting co-solidified fluoroelastomer shows improved curing performance, improved mechanical properties, and improved compression set. The co-solidified fluoroelastomer shows improved chemical resistance to solvent aging systems, and better retention of mechanical properties after high temperature aging in solvent systems.

The invention relates to the field of metal part polishing machining materials, and particularly discloses a fluid material for metal part polishing and a preparation method thereof. The invention relates to a fluid material for polishing a metal piece. The fluid material is prepared from the following raw materials in parts by weight: 20-30 parts of hydroxyl-terminated polydimethylsiloxane, 42-50 parts of an abrasive material, 18-28 parts of ethanol, 5-8 parts of a lubrication stabilizer and 2-4 parts of a methyl vinyl ether / maleic anhydride copolymer, the preparation method comprises the following steps: adding the lubrication stabilizer and the methyl vinyl ether / maleic anhydride copolymer into ethanol, stirring and dispersing, adding the hydroxyl-terminated polydimethylsiloxane and the grinding material, heating, kneading and dispersing, and carrying out vacuum defoaming. The fluid material prepared in the invention is applied to metal part polishing, the fluid material has good temperature resistance and viscosity stability in the polishing process, the surface uniformity of the polished metal part is good, the problem that local nonuniformity or scratches are easily generated in the polishing process of the fluid material is solved, and the polishing efficiency is improved.

The invention provides a preparation method of a hydrophobic modified perfluoroether elastomer, which is applied to the technical field of perfluoroether elastomers, and comprises the following steps: S1, mixing a fluorovinyl-containing crosslinkable fluorocarbon surfactant with ethylene glycol monomethyl ether, and stirring to obtain a composite dispersed microemulsion; s2, adding deionized water and a vulcanization point monomer into the composite dispersed microemulsion, and stirring to form an emulsion; s3, perfluoromethyl vinyl ether and an initiator are added, tetrafluoroethylene gas is introduced for a polymerization reaction, and perfluoroether elastomer emulsion is obtained; s4, demulsification treatment is carried out, washing is carried out after acidification with concentrated sulfuric acid, hydrophobic modification is carried out, and hydrophobic modified perfluoroether elastomer micro powder is obtained; and S5, sequentially carrying out mixing, compression molding and secondary vulcanization on the hydrophobic modified perfluoroether elastomer micro powder to obtain the hydrophobic modified perfluoroether elastomer sealing product. According to the process, the low-viscosity perfluoroether elastomer can be prepared, and the pollution of the fluorine-containing surfactant to the environment is reduced.

The present invention relates to phase change material (PCM) compositions comprising an aqueous solution of a salt hydrate phase change material component, one or more polymers, at least one of which is poly(4-styrenesulfonic acid-co-maleic acid), poly(methyl vinyl ether-alt-maleic acid), or polystyrenesulfonic acid, or mixtures of these polymers. The present invention also relates to methods of making PCM compositions comprising these polymers.

The present application relates to a kind of polyamide composite and its preparation method and application, belong to the composition technical field of polymer compound.The polyamide composite of the present application includes the following weight parts of component: polyamide 94~99.7 parts, tackifier 0.2~4 parts, processing aid 0.1~2 parts;The tackifier includes methyl vinyl ether-maleic anhydride copolymer and polytetrafluoroethylene.The polyamide composite has good processing ductility, can make the product prepared have excellent uniformity.

The invention relates to the technical field of fluorine chemical industry, in particular to a preparation method of perfluoromethoxy methylene vinyl ether.The preparation method comprises the following steps that S1, perfluoroolefin serves as a raw material to be subjected to an ozone cracking reaction, and trifluoromethyl fluoroformate is obtained through separation and purification; s2) enabling the trifluoromethyl fluoroformate to react with fluorine gas and halogenated olefin to generate fluorine halogen ether; and S3) carrying out dehalogenation or hydrogen generation on the fluorine halide ether to obtain the perfluoromethoxy methylene vinyl ether. The technical scheme provided by the invention has the following advantages: 1) the raw material cost is low, the main raw material for preparing trifluoromethyl fluoroformate is fluorine-containing olefin, and industrialization is realized; the perfluoromethoxy methylene vinyl ether has the advantages of simple preparation process, mild process conditions, simplicity, safety, reliability, good reaction selectivity, easy product separation, high yield, low cost and suitableness for industrial scale-up production.

The invention relates to the field of functional composite materials, and discloses a preparation process of an ecological leather fiber velvet composite material and a product. The preparation process of the ecological leather fiber velvet composite material comprises the following steps: S1, needling sea-island fibers to prepare a non-woven fabric; s2, carrying out gum dipping treatment by using a polyurethane gum dipping solution, and drying; s3, decrement splitting, water washing and drying; s4, softening treatment and sanding; s5, soaking with a pretreatment solution, dyeing with a dyeing agent, and drying; the pretreatment liquid in the step S5 contains a dyeing auxiliary agent composed of polydimethyldiallylammonium chloride, a methyl vinyl ether-maleic anhydride copolymer and bis [3-(triethoxysilyl) propyl] amine, and the dyeing agent is an acid dye containing sulfonate. According to the preparation method, through the preparation process of firstly sanding and then dyeing, and optimizing the types of the pretreatment liquid and the dyeing agent, the prepared ecological leather fiber velvet composite material has relatively good dyeing uniformity, color fastness and soft comfort, and the problem of white exposure after abrasion does not occur.

The high-pressure reactor comprises a reaction kettle, the reaction kettle comprises a heat preservation barrel, an inner barrel is fixedly installed on the inner wall of the heat preservation barrel, a conical bottom barrel is connected to the bottom of the inner barrel in a welded mode, a sealing ring is connected to the top of the heat preservation barrel and the top of the inner barrel in a welded mode, and a locking ring is connected to the inner wall of the inner barrel in a welded mode. The inner wall of the locking ring is fixedly connected with a positioning ring through a first bolt, the inner wall of the positioning ring is fixedly connected with a top cover through a second bolt, the locking ring and a sealing ring are matched for use, the top cover is fixedly installed on the top of the heat preservation cylinder and the top of the inner cylinder in a fastened and sealed mode, and a feeding cylinder is fixedly installed on the top of the top cover in a matched mode; the two first valves which are distributed up and down are arranged at the bottom of the feeding cylinder, so that the interior of the inner cylinder can be kept sealed, the situation of pressure relief of the inner cylinder can be effectively avoided, the use practicability of the equipment is improved, and raw materials can be conveniently added in the preparation reaction process.

An inkjet ink composition comprising: 1 to 15% by weight, based on the total weight of the inkjet ink composition, of at least one pigment, a carrier fluid, and 0.1 to 25% by weight, based on the total weight of the inkjet ink composition, of at least one polymer comprising first monomers selected from ethylenically unsaturated, hydrophobic monomers, wherein the ethylenically unsaturated, hydrophobic monomers are selected from styrene, α-methylstyrene, ethylene, propylene, 1-butylene, isobutylene, butadiene, methyl vinyl ether, and ethylenically unsaturated esters. and second monomers selected from maleic anhydride, maleic acid and salts, esters, imides and amides thereof, wherein at least a portion of the second monomers is functionalized with at least one organic group having a calcium index value greater than the calcium index value of phenylphosphonic acid, and wherein the first monomers are provided in the at least one polymer in a proportion in the range of 40 to 90 mol% relative to the at least one polymer, and wherein the second monomers are provided in the at least one polymer in a proportion in the range of 10 to 60 mol% relative to the at least one polymer, and wherein the at least one polymer has an acid number of 90 to 325 according to the following equation: AN (xlink) = AN (SP) − (% CO 2 − Target) × AN (SP) where “AN(xlink)” represents the acid number of the at least one polymer being crosslinked, “AN(SP)” represents the acid number of the starting polymer, and “%CO2 target” represents the percentage of the carboxylate-containing target for crosslinking.

The present disclosure relates to a method of manufacturing a test strip for measuring the specific gravity of a urine sample, the method comprising successively: - providing a polyelectrolyte in a first solution, the polyelectrolyte being a poly(methyl vinyl ether-alt-maleic anhydride), - adding to the first solution a base to neutralize the polyelectrolyte and bring the first solution to a pH between 10 and 11, - adding to the first solution a buffering agent to bring and maintain the first solution at a pH between 7.0 and 7.5, - dipping a paper strip into the first solution, - dipping the paper strip into a second solution comprising a pH-sensitive colored indicator. Figure 9

An oral care composition is disclosed, comprising 0.01 to 10% by weight of a deposited polymer and a polyhydroxy fatty acid amide surfactant of formula (I); wherein R 1 It is a C1-C4 alkyl or hydroxyl-substituted C1-C4 alkyl; R 2 It is a straight-chain or branched, saturated or unsaturated hydrocarbon chain having 15 to 21 carbon atoms, and a beneficial agent selected from optical agents, antimicrobial agents and mixtures thereof; wherein the deposited polymers include xanthan gum, sodium alginate, pectin, modified starch, gelatin, carrageenan, gellan gum, fenugreek gum, konjac gum, tragacanth gum, arabic gum, γ-polyglutamic acid, sodium heparin, copolymers of methyl vinyl ether and maleic anhydride, polyacrylic acid, polystyrene sulfonate, deoxyribonucleic acid, poly(allylamine), locust bean gum, guar gum, polyglycolic acid, polylactic acid, poly(glycolic acid-co-lactic acid), chitosan, humic acid, phytic acid, derivatives thereof or mixtures thereof:

This invention relates to the field of semiconductor sealing technology, and more particularly to a high-strength, low-emission, and high-purity perfluoroether material and its preparation method. By weight, it comprises the following components: 100 parts of perfluoroether rubber matrix, 0.5-5 parts of peroxide crosslinking agent, and 1-10 parts of co-crosslinking agent. The perfluoroether rubber matrix is ​​a perfluoro(methyl vinyl) ether-tetrafluoroethylene-perfluoroolefin ether terpolymer. This invention successfully prepares a perfluoroether material with excellent mechanical properties, plasma resistance, and low metal ion emission by employing a rational combination of high-purity peroxide crosslinking agents, the synergistic effect of TAIC and fluorinated olefin co-crosslinking agents, and a standardized post-cleaning treatment process, thus meeting semiconductor-grade requirements.

The invention relates to the field of microcapsule spices, and discloses a double-layer coated microcapsule spice as well as a preparation method and application thereof. The double-layer coated microcapsule perfume is composed of an oil-soluble capsule core perfume, an inner coating layer and an outer coating layer, wherein the inner coating layer is prepared from the following raw materials in percentage by weight: 6-10% of hydroxypropyl-beta-cyclodextrin, 3-5% of glycerol / inulin lauryl carbamate, 1.2-1.8% of hydroxyethyl chitosan, 2-4% of a dispersing agent and the balance of water; the outer coating layer is prepared from the following raw materials in percentage by weight: 20 to 30 percent of organic silicon modified polyurethane emulsion, 4.5 to 6.5 percent of polymethyl vinyl ether copolymerized maleic acid, 0.5 to 1.5 percent of PH (Potential of Hydrogen) regulator and the balance of water. The microcapsule perfume prepared by the invention is applied to the textile fabric and has better adhesion performance and washing resistance, and the textile fabric is good in softness and obvious and lasting in fragrance.

The application discloses a kind of lightweight high-strength self-compacting concrete and preparation method thereof, belong to concrete material technical field, the lightweight high-strength self-compacting concrete of the present application includes water, cement, mineral powder, fly ash, modified coal gangue aggregate, machine-made sand and naphthalenesulfonic acid / polycarboxylic acid system water reducing agent;The modified coal gangue aggregate is obtained by polymeric fluorine liquid activation full-grade aggregate;The polymeric fluorine liquid is obtained by polyethylene glycol, acrylic acid and perfluoroalkyl vinyl ether comonomer reaction in turn.This application prepared concrete is formed by full-grade aggregate, doped efficient water reducing agent, finally under the premise of ensuring lightweight, with high-strength and self-compacting property.Wherein, polyethylene glycol and acrylic acid are esterified first, then free radical polymerization occurs with perfluoromethyl vinyl ether, and then polymeric fluorine liquid is formed.Full-grade aggregate is coated by polymeric fluorine liquid, and then modified coal gangue aggregate is obtained.

Co-cured blends of fluoroelastomers of tetrafluoroethylene-propylene copolymer with cure site monomer and a pentapolymer of vinylidene fluoride (VDF), hexafluoropropylene (HFP), tetrafluoroethylene (TFE), perfluorinated methyl vinyl ether (PMVE) and ethylene (PE) with peroxide as initiator and coagent TAIC as crosslinker show improved curing performance, improved mechanical properties and improved compression set as well. The co-cured fluoroelastomers show improved chemical resistance to the solvent aging systems and better retention of mechanical properties after aging at high temperature in the solvents system.

The application discloses a peanut shell-based heavy metal adsorbent and a preparation method and application thereof. The preparation method comprises the following steps: pretreating peanut shell to obtain alkaliized peanut shell powder; under the catalysis of an organic base, the alkaliized peanut shell powder and a methyl vinyl ether / maleic anhydride copolymer are subjected to grafting reaction in a solvent I to prepare a peanut shell-methyl vinyl ether / maleic anhydride copolymer grafting product; under the catalysis of the organic base, the grafting product and a hydroxyl-terminated hyperbranched polyester are subjected to reaction in a solvent II, so that the peanut shell-based heavy metal adsorbent is obtained. The peanut shell-based heavy metal adsorbent prepared by the application has strong adsorption capacity, and the saturated adsorption capacity can reach 1185.50 mg.g 2+ . ‑1 .

The invention relates to a preparation method of perfluoroether rubber, which comprises the following steps: adding deionized water into a reaction kettle, introducing nitrogen into the reaction kettle to replace air, raising the temperature of the reaction kettle, and sequentially adding an emulsifier, tetrafluoroethylene and perfluoromethyl vinyl ether; adding an initiator and a chain transfer agent; mixing a vulcanization point monomer, an emulsifier and deionized water to form a vulcanization point monomer microemulsion, slowly pumping the vulcanization point monomer microemulsion into the reaction kettle, and obtaining latex after the polymerization reaction is finished; the monomer at the vulcanization point is perfluoro-4-cyano vinyl ether; demulsifying, washing and drying the latex to obtain raw rubber; mixing the raw rubber, the vulcanizing agent, the cross-linking aid and the acid acceptor; and vulcanizing the mixed rubber material to obtain the perfluoroether rubber. And the acid acceptor is calcium hydroxide. According to the preparation method disclosed by the invention, efficient and low-cost preparation of the high-performance FFKM is realized, so that the requirements of high-end fields such as semiconductors, petrochemical engineering, aerospace and the like on high-performance rubber materials are met.