26 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.

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 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.

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 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.

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 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.

The invention relates to a one-way moisture-conducting watermarking-free functional eyelet fabric and a production method thereof. Comprising a polyester quick-drying surface layer, a polyester hydrophobic inner layer and a connecting layer for connecting the polyester quick-drying surface layer and the polyester hydrophobic inner layer, the polyester hydrophobic inner layer is obtained by hydrophobic treatment of a hydrophobic treatment agent; the hydrophobic treatment agent is prepared from waterborne polyurethane resin, a waterborne polyisocyanate cross-linking agent, hydroxyl alkyl silicone wax, double-alcohol hydroxyl single-end-capped long-chain alkyl silicone oil and a processing aid; the polyester quick-drying surface layer is obtained by performing hydrophilic treatment on a hydrophilic quick-drying treatment agent; the hydrophilic quick-drying treatment agent is prepared from a water-based hydroxyl polyurethane dispersion, hydroxyl-terminated hyperbranched polyester, N-(beta-aminoethyl)-gamma-aminopropyl triethoxy silane, liquid polycaprolactone polyol, poly (methyl vinyl ether-ALT-maleic anhydride), sulfonated nano cellulose, blocked water-based polyisocyanate and a processing aid. The eyelet fabric prepared by the scheme has the advantages of moisture conductivity, quick drying, no watermark, durability and the like.

The present application relates to a kind of fluorescent enhancement composition and fluorescent enhancement liquid for tyramide signal amplification system.The fluorescent enhancement composition of the present application includes enhancer and cluster agent;The molar ratio of the enhancer and cluster agent is (0.1-1) mol:(1-10) mmol;The enhancer is one or more than two combinations of 4,4-bis (5-methyl-2-benzoxazolyl) stilbene, 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiofene, 4,4'-bis (2-sulfonic acid sodium phenylvinyl) biphenyl and 1,2-bis (5-methyl-benzoxazolyl) -ethylene;The cluster agent is one or more than two combinations of alginic acid, povidone, methyl vinyl ether-maleic anhydride copolymer and carrageenan.The fluorescent enhancement liquid with the above-mentioned fluorescent enhancement composition for tyramide signal amplification system as main component can enhance the effect of fluorescent signal amplification, reduce non-specific coloring.

The invention provides a method for preparing perfluoromethyl vinyl ether, which comprises the following steps: carrying out ozone cracking reaction by using perfluoroolefin as a raw material, and separating and purifying to obtain trifluoromethyl fluoroformate, the preparation method comprises the following steps: reacting trifluoromethyl fluoroformate with hexafluoropropylene oxide to obtain perfluoro-2-methoxypropionyl fluoride, and further carrying out pyrolysis decarboxylation on the perfluoro-2-methoxypropionyl fluoride to obtain the perfluoromethyl vinyl ether. The method for preparing trifluoromethyl fluoroformate through ozone oxidative cracking of perfluoroolefin is mild in reaction condition, good in selectivity, simple in process, safe and reliable, the product is easy to separate, and the yield is high. Other products related in the process, such as trifluoroacetyl fluoride and heptafluoroisobutyryl fluoride, are also very important industrial intermediates which are difficult to obtain; the trifluoromethyl fluoroformate is used for replacing carbonyl fluoride to prepare perfluoro-2-methoxypropionyl fluoride, so that the defects that carbonyl fluoride is high in toxicity and has potential safety hazards in production and use are overcome, and the whole process of PMVE is safe and reliable.

The present application relates to the technical field of vaginal ultrasound probe isolation film, in particular to a transvaginal ultrasound probe isolation film, a preparation method and application thereof. The transvaginal ultrasound probe isolation film comprises a medical elastomer, a bundle port belt and a hydrophilic coating lubricant, and is characterized in that the hydrophilic coating lubricant is made of the following raw materials in the total amount of 100 parts: polyurethane acrylate-glycidyl acrylate copolymer 20-30 parts, polyisocyanate 8-16 parts, polymethyl vinyl ether-maleic anhydride 10-20 parts, cross-linking functional monomer 5-10 parts, functional additive 3-8 parts, and PEG aqueous solution in the remaining amount. The isolation film coated with the hydrophilic coating lubricant obtained by optimizing the raw materials has the technical effects of high light transmittance, low thickness and low friction, the bundle port belt naturally shrinks and clamps the probe tail groove, realizes the anti-dropping and non-contact wearing, reduces the operation difficulty and reduces the cross-infection risk.

Described herein are an oral care compositions comprising a fluoride source, a polymer blend comprising a first polymer that is heat-sensitive and comprises a linear PEG / PPG triblock copolymer and polypropylene glycol(PPG)-SMDI copolymer, a second polymer comprising a copolymer of methyl vinyl ether and maleic anhydride, a third polymer comprising a triblock copolymer having a central hydrophobic block of polypropylene glycol with two end hydrophilic blocks of polyethylene glycol (PEG).

The feeding device comprises a top cover, a feeding assembly is fixed to the outer wall of the top of the top cover, the fixed feeding assembly comprises a feeding barrel, the bottom of the output end of the feeding barrel is fixedly connected with a discharging pipe, the feeding barrel is round, the inner wall of the feeding barrel is rotationally connected with an auger, and the discharging pipe is fixedly connected with the feeding barrel. According to the perfluoromethyl vinyl ether reactor, the first valve and the second valve which are distributed up and down are arranged, so that the internal environment and the external environment of the reactor can be always kept in a closed state when raw materials for preparing perfluoromethyl vinyl ether are injected; therefore, the phenomenon of pressure relief in the reactor for preparing the perfluoromethyl vinyl ether is avoided, the safety during feeding is conveniently improved, and interruption of preparation of the perfluoromethyl vinyl ether and influence on the preparation effect are avoided.

The invention relates to the technical field of oral care materials, and particularly discloses a denture cleaning tablet applying a water-soluble polymer material and a preparation method of the denture cleaning tablet. The denture cleaning tablet disclosed by the invention comprises a cleaning layer and a coating layer, the cleaning layer comprises the following components: sodium bicarbonate, citric acid, sodium carbonate, sodium percarbonate, potassium monopersulfate composite salt, tetraacetylethylenediamine, lauryl sodium sulfate, protease, a chitosan-polyethylene glycol grafted copolymer, copovidone, pigment and essence; the coating layer is prepared from the following components in parts by weight: 10 to 16 parts of copolymer of polymethyl vinyl ether / maleic acid mixed salt, 1 to 3 parts of polyethylene glycol 2000 and 0.5 to 1 part of polyethylene glycol 8000. The denture cleaning sheet prepared by the invention not only ensures that the cleaning sheet has an excellent descaling effect, but also reduces the influence on the mechanical properties of a denture material, and meanwhile, the safety and weather resistance of the cleaning sheet are improved.

The application provides a perfluoroether raw rubber resistant to low temperature and strong oxidizing medium, a preparation method and application thereof. Specifically provided is a preparation method of an elastomer, which comprises the following steps: polymerizing a mixture of water, perfluoromethoxy methyl vinyl ether, an emulsifier, a chain transfer agent, an initiator and a vulcanization point monomer with tetrafluoroethylene to obtain the elastomer; wherein the tetrafluoroethylene is added in a gaseous form, and the polymerization reaction is carried out under 2-5 Mpa; the mass ratio of the perfluoromethoxy methyl vinyl ether to the emulsifier is 1:(0.01-0.1); the mass ratio of the perfluoromethoxy methyl vinyl ether to the chain transfer agent is 2:(0.01-0.1); and the mass ratio of the perfluoromethoxy methyl vinyl ether to the vulcanization point monomer is 2:(0.01-0.2). The preparation method can efficiently prepare the elastomer, and the obtained elastomer is resistant to low temperature, has good mechanical properties and good processability.

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