63 results about "Methyl vinyl ether" patented technology

The invention discloses porous cyclodextrin microspheres loaded with nano-silver as well as a preparation method and application of the porous cyclodextrin microspheres. The porous cyclodextrin microspheres are obtained by loading nano-silver on oligomeric cyclodextrin with the molecular weight of 8000-14000, then blending the oligomeric cyclodextrin with poly (methyl vinyl ether-alt-maleic acid) to obtain microspheres and then cross-linking the microspheres. The porous cyclodextrin microspheres are selected as the carrier of AgNP, and cyclodextrin has a hydrophobic cavity, so that specific hydrophobic molecules and pollutants can be included in the cavity, and contact and catalysis processes of reactants and silver particles are promoted synergistically. Moreover, the cyclodextrin microspheres have micron-scale and even millimeter-scale porous structures, the abundant porous structures can ensure that reactants quickly enter the microspheres to be in full contact with silver, the catalytic reaction is efficiently carried out, and meanwhile, the larger size of the microspheres ensures that fluid can pass through the microspheres at a high speed in a fixed bed reactor, so that the catalytic efficiency is improved. And the contradiction between the catalyst efficiency and the large particle size in practical application is solved.

The invention provides perfluoroether fluororubber as well as a preparation method and application thereof. The perfluoroether fluororubber is in an A-B-A block form; the A block is formed by polymerizing tetrafluoroethylene and perfluoropropyl vinyl ether, and the molar ratio of the tetrafluoroethylene to the perfluoropropyl vinyl ether is (65 to 80): (20 to 35); the block B is formed by polymerizing tetrafluoroethylene and perfluoromethyl vinyl ether, and the molar ratio of the tetrafluoroethylene to the perfluoromethyl vinyl ether is (35-55): (65-45); and the mass fraction of the block B in the perfluoroether fluororubber is 50%-80%. The perfluoroether fluororubber has excellent high temperature resistance, can resist the high temperature of 320 DEG C, has excellent elongation, and is low in hardness, small in compression deformation and good in medium resistance and processability.

The invention belongs to the technical field of coatings, and provides an environment-friendly solvent-free coating composition for a metal surface and a preparation method of the environment-friendly solvent-free coating composition. According to the coating composition, through the synergistic effect of the fluorine-containing polymer, the fluorinated polyester and the modified polyurethane, the corrosion resistance and the environmental stability of a coating are improved. Firstly, perfluoromethyl vinyl ether and triethanolamine react under the action of a catalyst to prepare a fluorine-containing polymer, and a three-dimensional cross-linked network structure of the fluorine-containing polymer endows a coating with hydrophobicity and chemical inertness; secondly, fluorinated polyester is prepared through free radical polymerization, and the surface energy is reduced through a perfluorinated chain segment; finally, modified polyurethane is prepared through polycaprolactone glycol, single-terminal dihydroxyl polydimethylsiloxane and the like, the surface energy is reduced through a silicon-oxygen chain segment of the modified polyurethane, and the oxidation resistance is improved through a thioether bond. The coating composition shows excellent water resistance, oxidation resistance and chemical corrosion resistance, has excellent mechanical property and adhesive force, and is suitable for protecting a metal substrate in a severe environment for a long time.

The invention discloses a crosslinkable perfluoroelastomer and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing nitrile perfluoroalkyl vinyl ether, a fluorocarbon solvent, deionized water and an emulsifier, and emulsifying to obtain a nitrile perfluoroalkyl vinyl ether microemulsion; (2) adding raw materials containing the nitrile perfluoroalkyl vinyl ether microemulsion, perfluoromethyl vinyl ether, tetrafluoroethylene and an initiator into a high-pressure polymerization kettle, and carrying out a copolymerization reaction; (3) after the copolymerization reaction is finished, cooling, emptying the pressure of the polymerization kettle to normal pressure, and taking out the emulsion in the kettle; and (4) demulsifying, condensing, filtering, washing and drying the emulsion in the kettle to obtain the crosslinkable perfluoroelastomer. The copolymer has higher molecular weight and crosslinking degree, and can be used as a sizing material of the perfluoroether rubber to perform vulcanization reaction in a rubber system without a crosslinking agent or with peroxide as a crosslinking agent, and the obtained perfluoroether rubber has excellent high temperature resistance.

The invention discloses a high-temperature-resistant perfluoroether elastomer composition and a preparation method thereof. The preparation method of the high-temperature-resistant perfluoroether elastomer composition comprises the following steps: S1, carrying out emulsion polymerization on tetrafluoroethylene, perfluoromethyl vinyl ether, a non-conjugated fluorine diene vulcanization point monomer, a phenyl-containing perfluorodiene vulcanization point monomer and a peroxide initiator according to a preset proportion to obtain a perfluoroether elastomer emulsion; s2, condensing, washing and drying the perfluoroether elastomer emulsion to obtain perfluoroether elastomer micro powder; s3, mixing and thin-passing the perfluoroether elastomer micro powder with a filler, an acid acceptor and a vulcanizing agent in a preset proportion to obtain perfluoroether elastomer mixed rubber; and S4, carrying out compression molding on the perfluoroether elastomer rubber compound, and carrying out secondary vulcanization to obtain the perfluoroether elastomer composition with high temperature resistance and water vapor resistance. The perfluoroether elastomer composition prepared by the invention has the characteristics of high temperature resistance, water vapor resistance and low compression set.

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 present invention relates to the field of oral care and discloses a multi-effect synergistic oral whitening composition and its use. The oral whitening composition comprises: 3-80% methyl vinyl ether / maleic anhydride copolymer, 3-70% sodium monofluorophosphate, and 10-95% phosphate. The mass ratio of the methyl vinyl ether / maleic anhydride copolymer, sodium monofluorophosphate, and phosphate is 1:(0.2-7.5):(0.2-40). The molar ratio of methyl vinyl ether to maleic anhydride in the methyl vinyl ether / maleic anhydride copolymer ranges from 2:1 to 1:2, and the molecular weight ranges from 800,000 to 3,000,000. The present invention combines the methyl vinyl ether / maleic anhydride copolymer, sodium monofluorophosphate, and phosphate in specific proportions and types to produce a multi-effect synergistic effect in terms of rapid whitening, long-lasting prevention of tooth staining, and prevention of dental calculus.

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.

According to the preparation method of the chlorogenic acid-methotrexate soluble microneedle, chondroitin sulfate and a methyl vinyl ether-maleic anhydride copolymer are adopted as matrix materials, and the drug-loaded microneedle is prepared through a two-step centrifugation method. The length of a needle body of the prepared microneedle is about 500 microns, the microneedle has good mechanical strength and skin puncture performance, the microneedle can be basically dissolved within 2 hours, the average drug content of chlorogenic acid is 57.97 + / -1.76 mu g / tablet, and the average drug content of methotrexate is 56.32 + / -1.67 mu g / tablet. An in-vitro percutaneous penetration test shows that the 6-hour cumulative transdermal rate of chlorogenic acid reaches 93.96%, the 6-hour cumulative transdermal rate of methotrexate reaches 86.92%, which are respectively 22.1 times and 3.0 times that of a control solution group, so that the efficient percutaneous delivery of the medicine is realized. The microneedle is small in skin irritation, the skin barrier can be naturally repaired within 15 minutes after puncture, and a new administration approach is provided for treatment of skin diseases such as psoriasis.

The invention relates to a magnetophoretic transdermal delivery hydrogel microneedle device, which belongs to the technical field of medicine, and comprises a base layer, a plurality of hydrogel microneedles are arranged on one side of the base layer at equal intervals along the length and width directions of the base layer, each hydrogel microneedle is composed of a methyl vinyl ether-maleic acid copolymer and pectin, a medicine layer is arranged on the other side of the base layer, and the hydrogel microneedles are arranged on the other side of the medicine layer. The hydrogel microneedle penetrates through the skin surface layer to form a drug delivery channel, the hydrogel microneedle composed of the methyl vinyl ether-maleic acid copolymer and the pectin has high mechanical strength and toughness, the situation that the hydrogel microneedle breaks during puncture is reduced, and the drug delivery effect is improved. The broken micro-needle fragments can be naturally decomposed, local infection and inflammatory reaction caused by long-time residual of the micro-needle fragments in the skin are avoided, extra risks caused by treatment are reduced, the magnetic layer drives the diamagnetic medicine to enter the skin along the administration channel through magnetomotive force, and therefore the medicine release efficiency of the hydrogel micro-needle is improved.

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 provides low-temperature-resistant and strong-oxidizing-medium perfluoroether raw rubber as well as a preparation method and application of the low-temperature-resistant and strong-oxidizing-medium perfluoroether raw rubber. The preparation method of the elastomer comprises the following steps: carrying out polymerization reaction on tetrafluoroethylene and a mixture of water, perfluoromethoxy methyl vinyl ether, an emulsifier, a chain transfer agent, an initiator and a vulcanization point monomer to obtain the elastomer, wherein the tetrafluoroethylene is added in the form of gas, and a polymerization reaction is carried out under 2-5 Mpa; the mass ratio of the perfluoromethoxy methyl vinyl ether to the emulsifying agent 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); the mass ratio of the perfluoromethoxy methyl vinyl ether to the vulcanization point monomer is 2: (0.01-0.2). The preparation method provided by the invention can be used for efficiently preparing the elastomer, and the obtained elastomer is resistant to low temperature, good in mechanical property and good in processability.

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 invention relates to the technical field of steel and iron materials, in particular to a low-silicon low-sulfur cold-rolled steel sheet and a processing technology thereof. Steel raw materials are sequentially subjected to smelting, forging, hot rolling, acid pickling, cold rolling, critical annealing and leveling processes, and the steel plate is obtained. And then the copper-coated graphene powder and metal powder are used as raw materials, and the metal reinforced coating is prepared. The fluorine modified organic polysilazane is obtained by adding the organic polysilazane, the isocyanate terminated polyurethane, the tetrafluoroethylene, the hexafluoropropylene and the perfluoromethyl vinyl ether. And the fluorine modified organic polysilazane and amphiphilic nano silicon dioxide are used as raw materials to prepare the wear-resistant and corrosion-resistant coating. And sequentially depositing the metal reinforced coating and the wear-resistant and corrosion-resistant coating on the surface of the steel plate through a cold spraying process to obtain a finished product. The finished product prepared by the method has good surface strength, wear resistance and corrosion resistance, so that the finished product has a wide application prospect in the field of steel and iron materials.

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.