37results about How to "Good alkali resistance and stability" patented technology

The invention discloses a preparation method of a semi-flexible polyether sulfone / ketone anion-exchange membrane, and particularly provides a preparation method of a high-conductivity anion-exchange membrane of a fuel cell. The membrane material contains flexible aliphatic chains with different lengths in repetitive units. The preparation method comprises steps as follows: 1), polymer synthesis; 2), polymer halomethylation; 3), preparation of the semi-flexible polyether sulfone / ketone anion-exchange membrane. Due to the fact that the aliphatic chains are introduced into a main polymer chain, the flexibility of the main chain is further improved, the main chain acquires higher mobility, hydrophilic and hydrophobic microphase separation is enhanced, a better ion channel is formed accordingly, and membrane swelling is reduced. The preparation technology is simple, the cost is low, and the prepared anion-exchange membrane has high conductivity and good stability and is applicable to an alkaline fuel cell.

The invention relates to a carbon-nanotube-doped type basic anion exchange composite membrane, and a preparation method and application thereof. The composite membrane comprises: oxygen group-containing water-soluble polyvinyl alcohol PVA and a quaternary ammonium group-containing water-soluble polymer with a mass ratio of 1:0.5-1, and carbon nanotube accounting for 0.5-3 wt% of the above two components. The preparation method comprises: dissolving oxygen group-containing water-soluble polyvinyl alcohol in deionized water, heating to 90 DEG C and stirring into a transparent homogeneous solution; respectively dissolving the quaternary ammonium group-containing water-soluble polymer and carbon nanotube in deionized water, mixing the above three solutions to obtain a homogeneous solution, drying to form a membrane and further to obtain a polymer membrane; performing crosslinking processing on the polymer membrane, and finally performing ion exchange to obtain the composite membrane. The composite membrane is applicable to fuel cells, metal-air cells, chlor-alkali industry and wastewater processing. The composite membrane provided by the invention has relatively high hydroxide ion conductivity and excellent stability and endurance, is simple in production, good in membrane forming ability, low in cost, green and environment friendly.

The invention belongs to the technical field of leather chemical engineering and relates to a novel cationic polymer leather fat-liquoring agent and a preparation method thereof. The preparation method of the novel cationic polymer leather fat-liquoring agent comprises the following steps of 1, preparing an intermediate I, 2, preparing an intermediate II, and 3, preparing the novel cationic polymer leather fat-liquoring agent. The novel cationic polymer leather fat-liquoring agent is a yellow viscous liquid, has a pH value of 3.0-5.0, and effective substance content of 20-30wt%. The novel cationic polymer leather fat-liquoring agent aqueous emulsion having a ratio of 1: 9 does not layer in 24h and does not produce oil slick. The novel cationic polymer leather fat-liquoring agent has good standing stability and does not go bad at a room temperature in 6 months. The novel cationic polymer leather fat-liquoring agent has excellent dilution-resistant stability, alkali-resistant stability, acid-resistant stability and chromium salt-resistant stability.

The invention provides a method for purifying nonapeptide-1, which belongs to the technical field of polypeptide purification, and specifically adopts a combination method of gel chromatographic column chromatography, reversed-phase high-performance liquid chromatography, and anion-exchange chromatography to treat crude nonapeptide-1 For purification, the filler for reversed-phase high-performance liquid chromatography is a modified silica gel chromatography filler, which not only has good acid and alkali resistance stability, but also does not collapse during the separation process, prolonging the service life. Using the modified silica gel filler to separate Purification of nonapeptide-1 can improve peak shape, overcome peak broadening and tailing problems, and quickly and efficiently separate nonapeptide-1 with a faster peak time, achieving the purpose of improving the yield and purity of nonapeptide-1.

Disclosed are a novel synthetic cationic vegetable oil fat liquor and a preparation method thereof. The novel synthetic cationic vegetable oil fat liquor is prepared from rapeseed oil, methanol, ethanolamine and quaternary ammonium salt ETA (epoxypropyl trimethyl ammonium chloride) by transesterification between the rapeseed oil and the methanol, amidation reaction between rapeseed oil fatty acid methyl ester and the ethanolamine and reaction between quaternization reagent and a product obtained from amidation reaction. The novel synthetic cationic vegetable oil fat liquor and the preparation method have the advantages that by means of an internal emulsification method, cationic active groups are introduced into rapeseed oil molecular structures, and accordingly, the novel synthetic cationic vegetable oil fat liquor is high in dilution-resisting, acid-resisting, alkali-resisting and chromic-salt-resisting stability; permeation and even distribution of chromium can be promoted, chromium absorption of rawhide is increased, and the novel synthetic cationic vegetable oil fat liquor can serve as a pre-fat-liquoring material before chrome tanning; the novel synthetic cationic vegetable oil fat liquor has excellent oil and color fixation performance, thereby being a preferred material serving as leather dyeing and oil and color fixing after fat liquoring.

The invention provides alkali-resisting activated dye and belongs to the technical field of fine chemical engineering. The alkali-resisting activated dye is prepared from, by weight, 60-90 parts of dye, 30-50 parts of an alkali-resisting conditioning agent and 10-20 parts of a water repellent agent. In order to solve the problem that dye has many hydrophilic groups, thereby being poor in water resistance and not resistant to water washing, the alkali-resisting activated dye is applied to the commercial production process of dye, the alkali-resisting conditioning agent and the water repellent agent with the certain proportion are added in a commercial dye formula, the molecule groups of the activated dye are wrapped through the water repellent agent, and the hydrophilic groups of the activated dye are obstructed. General mixing equipment is used for directly preparing the alkali-resisting activated dye, and the alkali-resisting activated dye has the advantages of being convenient to apply, good in alkali-resisting stability and the like.

The invention discloses a poly(fluorenyl ether nitrile) crosslinked anion exchange membrane material with functionalized cationic groups for a fuel cell and a preparation method of the poly(fluorenyl ether nitrile) crosslinked anion exchange membrane material, and relates to the technical field of anion exchange membranes. According to the invention, a poly(fluorenyl ether nitrile) polymer with a benzyl methyl group is produced by a nucleophilic polycondensation reaction; then a poly(fluorenyl ether nitrile) polymer with benzyl bromide is produced by a bromination reaction; then a poly(fluorenyl ether nitrile) polymer with functionalized cationic groups is produced by a quaternization reaction; at last, through adding a crosslinked agent, the poly(fluorenyl ether nitrile) crosslinked anion exchange membrane material with functionalized cationic groups is produced by a solution blending method. At 80 DEG C, the ionic conductivity is 0.051S / cm-0.089S / cm; at 30 DEG C, the methanol permeability coefficient is 0.96x10<-7>cm<2>s<-1>-1.56x10<-7>cm<2>s<-1>. After being soaked in a NaOH solution with the concentration of 2mol / L at 60 DEG C for 10 days, the crosslinked membrane remains the ionic conductivity of 60.0-77.5%, indicating that the crosslinked anion exchange membrane has excellent stability in alkali resistance. Compared with a perfluorosulfonic acid film, the composite proton exchange membrane produced in the invention is lower in cost and easy to be industrialized and can be applied in the fuel cell field.