12 results about "Allyl bromide" patented technology

The invention discloses a catalyst for preparing ultrahigh molecular weight polyoxyethylene as well as a preparation method and application thereof, and relates to the technical field of catalyst preparation. The preparation method of the catalyst comprises the following steps: S1, carrying out a reaction on 6-hexamethylenediamine and allyl acrylate to generate an intermediate 1, S2, carrying out a reaction on the intermediate 1 and diphenylphosphine to generate an intermediate 2, S3, carrying out a reaction on the intermediate 2 and allyl bromide to generate an intermediate 3, and S4, carrying out a reaction on the intermediate 3 and 9-boron bicyclo [3.3. 1] nonane. The prepared catalyst is high in catalytic activity, ultrahigh molecular weight polyoxyethylene can be prepared, and the molecular weight distribution of the prepared ultrahigh molecular weight polyoxyethylene is narrow.

This invention discloses a low-functionality photocurable resin and its preparation method, comprising: dissolving polybenzimidazole in a polar aprotic solvent in an inert gas atmosphere to obtain a polybenzimidazole solution; adding sodium hydride in a molar amount equal to 0.8–1.2 times the molar amount of the polybenzimidazole resin to the polybenzimidazole solution, reacting the mixture, then adding allyl bromide in a molar amount equal to 0.8–1.2 times the molar amount of the polybenzimidazole resin, reacting again to obtain a polybenzimidazole prepolymer; dissolving the polybenzimidazole prepolymer in a polar aprotic solvent, adding a crosslinking agent and a photoinitiator, and mixing to obtain a photocurable resin solution; irradiating the photocurable resin solution with ultraviolet light, and drying to obtain a photocurable resin with a functionality of 20%–44%. This invention features a low allyl content, allowing for the curing of aromatic resins with less crosslinking agent, and the cured resin exhibits excellent heat resistance and ultra-high mechanical strength.

The application belongs to the technical field of materials, and provides a bio-based bismaleimide resin and a preparation method and application thereof, the resin being prepared by copolymerization of curcumin allyl ether and N,N'-4,4'-diphenylmethane bismaleimide. The curcumin allyl ether has a beta-diketone conjugated system, and is prepared by nucleophilic substitution reaction of curcumin and allyl bromide in a potassium carbonate acetone system; when prepared, the two are cured in stages at 150-240 DEG C to form a high crosslinking network, and a vacuum degassing and curing process is combined. The bio-based bismaleimide resin provided in the application has a curing peak temperature that is 20-30 DEG C lower than that of a traditional BD resin, a Tg that is nearly 90 DEG C higher than that of the BD resin, a carbon residue rate at 800 DEG C that is greater than or equal to 42%, an LOI that is greater than or equal to 37%, reaches a UL-94 V-0 level, a THR that is as low as 12.4 kJ / g, less flammable volatile matter at high temperatures, and a high degree of carbonization of residual carbon.

The invention belongs to the field of high polymer materials, and relates to a clean construction method of a halogen-free phosphorus-free flame-retardant epoxy polymerization system. The preparation method comprises the following steps: preparing an intermediate I from 2, 2 '-diallyl bisphenol and allyl bromide under the action of potassium carbonate; carrying out rearrangement reaction on the intermediate I to prepare an intermediate II; and carrying out etherification and ring-closure reaction on the intermediate II and epoxy chloropropane under the action of a catalyst and sodium hydroxide to obtain the epoxy resin monomer III. The halogen-free phosphorus-free flame-retardant epoxy resin polymer is obtained by mixing an epoxy resin monomer with a curing agent, melting, performing injection molding and curing. The halogen-free and phosphorus-free flame retardant polymer obtained by the invention can reach the flame retardant grade of UL94-V0 grade.

The invention relates to the technical field of fabrics, in particular to a light-weight down-proof knitted fabric for down jackets. The invention relates to a light down-proof knitted fabric for down jackets. The preparation method comprises the following steps: preparing a composite shell-core hybrid emulsion, preparing modified aramid nanofibers, and preparing the down-proof knitted fabric. The core-shell emulsion is prepared from allyl bromide modified silicon dioxide and is uniformly dispersed to prevent down penetration; modified aramid fibers are prepared from camphor, so that double heat insulation barriers are formed, and light weight is achieved. Hexagonal jacquard weave is adopted for weaving to enhance the stability, and an environment-friendly TPU hot film is coated to form a double-barrier, waterproof, anti-corrosion and protective coating, so that the downproof validity period is prolonged, and the strength and the heat preservation property of the fabric are improved.

The application provides a branched halogenated butyl rubber preparation method, compared with the prior art, the branched butyl rubber synthesized by the application has a bimodal distribution of molecular weight, the molecular weight distribution is widened, and the mechanical properties such as tensile strength are obviously improved, so that the processing performance of the butyl rubber is effectively improved; the branched butyl rubber halogenation method provided by the application improves the neutralization efficiency, reduces the possibility of incomplete neutralization, effectively inhibits the conversion of the secondary allyl bromine substitution product into the primary allyl bromine substitution product, the obtained brominated butyl rubber has excellent indexes, and the structure is more stable; meanwhile, the preparation method provided by the application is simple in operation, easy in condition control and low in cost, and has a wide application prospect.

The invention belongs to the field of synthesis of drug intermediates, and discloses a process for industrially producing 2-allyl-3-methoxybenzaldehyde. The synthesis method comprises the following three steps: 1, alkylation reaction: reacting a raw material 3-hydroxybenzaldehyde with allyl bromide under an alkaline condition to obtain an allyl ether intermediate (3-allyl ether benzaldehyde); and 2, Claisen rearrangement reaction of the allyl ether intermediate: under a brand new flowing chemical reaction device (240 DEG C, 2MPa back pressure), dissolving the raw materials in a solvent, pumping the solvent into a microchannel, carrying out rearrangement reaction, and recrystallizing to remove an isomer, so as to obtain the intermediate 2-allyl-3-hydroxybenzaldehyde. And 3, methylation reaction: enabling the 2-allyl-3-hydroxybenzaldehyde to react with dimethyl sulfate under an alkaline condition, so as to obtain the product 2-allyl-3-methoxybenzaldehyde. The total yield of the three steps is 40%. According to the process, the raw materials are low in price and easy to obtain, the process operation is simple and convenient, and the process is suitable for industrial production of the 2-allyl-3-methoxybenzaldehyde.

The application discloses a kind of bio-based epoxy resin precursor, composite insulating material and its preparation method and application, belong to bio-based epoxy resin technical field, the bio-based epoxy resin precursor includes glycidyl ether structure and glycidyl ester structure, preparation method is as follows: (1) hydroxyl polyacid, allyl bromide occurs substitution reaction under the action of acid binding agent, and intermediate is prepared; (2) intermediate, hydrogen peroxide and acid catalyst are mixed and carried out oxidation reaction, and the bio-based epoxy resin precursor is prepared.The composite insulating material cured with the bio-based epoxy resin precursor has excellent thermodynamic performance and electrical performance, and also has the characteristics of rapid degradation under alkaline conditions and biodegradation in natural environment, suitable for the support, insulation and sealing of electrical equipment.

The invention relates to a preparation method of a carbon nanotube loaded Ru-Zn bimetallic catalyst for removing trace acetylene and ethylene impurities in electronic grade hydrogen chloride, and belongs to the technical field of catalysts. The method comprises the following steps: drying a carbon nanotube, dipping the carbon nanotube in a RuCl solution, stirring, carrying out ultrasonic treatment, and drying; dipping the Ru-loaded carbon nanotube in a zinc chloride solution, stirring, and drying to obtain a Ru / Zn intermediate; adding the Ru / Zn intermediate into a sodium hydroxide solution, adding tetraallylammonium bromide and 2, 5-dimercaptothiadiazole disodium salt, heating and stirring for reaction, and drying; placing the sample in an HCl atmosphere, and activating to obtain a nanoscale Ru-Zn bimetallic catalyst; the prepared catalyst has extremely high catalytic activity on trace acetylene and ethylene impurities in electronic-grade hydrogen chloride, can deeply remove the impurities, and meets the requirement of the electronic-grade hydrogen chloride on high purity.

The invention provides a preparation method of octabromoS ether, and belongs to the technical field of flame-retardant materials. According to the preparation method, bisphenol S and allyl bromide are subjected to a carbon-oxygen coupling reaction under catalysis of a transition metal compound catalyst, bisphenol S diallyl ether and hydrogen bromide are obtained, hydrogen bromide can be recycled in a subsequent addition reaction, and the cost is saved; then hydrobromic acid and bisphenol S diallyl ether are subjected to an addition-electrophilic substitution reaction under catalytic oxidation of hydrogen peroxide to obtain octabromo-S ether, and high-toxicity bromine is not adopted; hydrogen peroxide is reduced into water in the reaction, so that the method is green and environment-friendly.

The invention belongs to the technical field of materials, and provides bio-based bismaleimide resin as well as a preparation method and application thereof, and the resin is prepared by copolymerizing curcumin allyl ether and N, N '-4, 4'-diphenylmethane bismaleimide. The curcumin allyl ether has a beta-diketone conjugated system and is prepared by carrying out nucleophilic substitution reaction on curcumin and allyl bromide in a potassium carbonate acetone system; during preparation, the two components are subjected to segmented curing at 150-240 DEG C to form a high-crosslinking network, and vacuum degassing and curing processes are combined. According to the bio-based bismaleimide resin provided by the invention, in thermal performance and processability, the curing peak temperature is reduced by 20-30 DEG C compared with that of traditional BD resin, and Tg is greater than or equal to 390 DEG C and is increased by nearly 90 DEG C compared with that of the BD resin; in flame retardance and thermal stability, the carbon residue rate at 800 DEG C is greater than or equal to 42%, the LOI is greater than or equal to 37% and reaches the UL-94 V-0 level, the THR is as low as 12.4 kJ / g, the high-temperature flammable volatile matter is few, and the carbon residue graphitization degree is high.

The invention provides a preparation method of a polysaccharide corrosion inhibitor, which comprises the following steps: a) carrying out nucleophilic substitution reaction on beta-cyclodextrin and allyl bromide in an aprotic polar solvent at 0 DEG C under an alkaline condition to obtain allyl beta-cyclodextrin with double bonds; b) dissolving xanthan gum in water under an anaerobic condition, adjusting the pH value to 3-7, adding an ammonium ceric nitrate initiator, then adding the allyl beta-cyclodextrin obtained in the step a), and carrying out a free radical graft copolymerization reaction at 50-80 DEG C; and after the reaction is completed, adding a terminating agent, precipitating, filtering and drying to obtain the xanthan gum grafted beta-cyclodextrin corrosion inhibitor. The natural polysaccharide beta-cyclodextrin and xanthan gum are used as main raw materials, so that the natural polysaccharide beta-cyclodextrin and xanthan gum are wide in source, renewable and biodegradable. Any toxic and harmful heteroatom (such as N, S, P and the like) or a high-toxicity catalyst is not used or introduced in the whole preparation process, and the final product is non-toxic and pollution-free and completely conforms to the concepts of green chemistry and sustainable development.