30results about How to "Increase hydrogen bond" patented technology

The invention uses beta-cyclodextrin to synthesize six kinds of new beta-cyclodextrins derived from alpha-Schiff base and six chiral stationary phases thereof, wherein the invention reacts cyclodextrin aldehyde and six amine compounds to prepare beta-cyclodextrin derived from alpha-Schiff base, the compounds reacted with cyclodextrin aldehyde are L-phenylglycinol, D-phenylglycinol, L-tyrosine, D-tyrosine, L-tryptophan and D-tryptophan. The synthesis route is simple, with high yield, simple operation and easy purification. The invention can be used in chiral separation for the qualitative and quantitative research on optical isomer of amino acid, ferrocene amine compound, drug, sulfur-containing compound, alcohol compound, amino-compound and various chiral compounds. The invention can be used in asymmetry catalysis for recovering and circulating catalyst.

The invention discloses a clean pulping process for dissociated modified plant fibers. The clean pulping process comprises the following steps: (1) pre-processing raw materials; (2) preparing coarse pulp; (3) pulping; (4) removing sand; (5) screening; and (6) concentrating and extruding pulp. According to the clean pulping process disclosed by the invention, no sodium hydroxide is added, pulp-washing and bleaching processes can be reduced, and the wastewater in the pulping process can be sufficiently reutilized through simple treatment, so that pulping black liquor which is severely polluted is not produced. Meanwhile, plant fibers can be sufficiently dissociated, and the pulping quality is greatly improved.

The invention discloses a preparation method of a cyclodextrin terminated star-shaped polymer. The method includes the steps of: under anhydrous and oxygen-free conditions, using dipentaerythritol asthe initiator, using stannous isooctanate as the catalyst to carry out ring-opening polymerization reaction on epsilon-caprolactone so as to obtain six-armed polycaprolactone, and then carrying out esterification reaction on p-aminobenzoic acid to obtain an arylamine terminated six-armed star-shaped polymer, and then further carrying out addition-dehydration reaction with cyclodextrin monoaldehyde, thus obtaining the imine group chained and cyclodextrin terminated six-armed star-shaped polymer. According to the method, cyclodextrin is disposed at the terminal of the star-shaped polymer, the prepared product not only has the three-dimensional structural characteristics of the star-shaped polymer itself, but also can better retain the advantages of the cyclodextrin chamber and cavity surrounding structure, thus enlarging the application range. The invention expands the types of star-shaped cyclodextrin polymers. The preparation method has the advantages of simple operation, mild reactionconditions, and simple product post-treatment, and is beneficial to realization of industrial production.

The present invention relates to bright warm-keeping lightness type fibers and a preparation method thereof, wherein mainly a polyester is subjected to special-shaped spinning hole melt spinning, oil agent feeding and winding so as to prepare the bright warm-keeping lightness type fibers, wherein the oil agent at least comprises a fluorine-containing polyether, the mass of the fluorine-containing polyether is more than or equal to 45% of the mass of the oil agent, the fluorine-containing polyether is a random copolymer of ethylene oxide, [(1,1,2,2-tetrafluoroethoxy)methyl]ethylene oxide and propylene oxide, and the structure formula is defined in the specification. The preparation method comprises: metering a polyester, extruding, cooling, oiling, stretching, carrying out thermal shaping, and winding so as to prepare the bright warm-keeping lightness type fibers. According to the bright warm-keeping lightness type fibers of the present invention, the fiber cross section shape is changed by the spinning while the fibers have the hollowness, the air permeability and the thermal insulation property are increased, and with the special cross section shape of the fibers, the bright surface light refraction effect is provided so as to make the fabric bright and gorgeous; and the fibers further have characteristics of lightness, light weight, and soft touch feeling.

The invention relates to a novel chiral catalyst of an (S)-Alpha, Alpha-fluorine-containing diaryl-2-pyrrolidine methanol derivative and provides a preparation method and applications in an asymmetricreaction thereof. The preparation method comprises the following steps: adopting amino protected N-substitute-2 pyrrolidine methyl formate to react with a grignard reagent, then removing the protecting group; and then reacting with alkyl chlorosilane to prepare the (S)-Alpha, Alpha-fluorine-containing diaryl-2-pyrrolidine methanol derivative. The invention has the following beneficial effects: compared with other chiral catalysts of aryl pyrrolidine methanol derivative, the chiral catalyst of the fluorine-containing aryl pyrrolidine methanol derivative not only enhances the activity on N andimproves catalysis, but also simultaneously increases substrates and hydrogen bonds of catalysts as well as stereoselective reaction of the substrates, and broadens the application scope of the substrates.

The present invention relates to a compound containing polynitrophenyladamantanamine and its synthesis method. Said invention also provides its molecular formula and the concrete steps of its synthesis method.

This invention relates to a method for synthesizing compounds containing azidotriazine amantadine, whose molecular formulae are shown in formulae I and II. The method comprises: reacting dichlorotriazine amantadine and hydrazine hydrate in a mixture of water and organic solvent by nycleophilic substitution, reacting with sodium nitrite in HCl solution to oxidize hydrazine into azide, extracting the product with ethyl acetate for three times, spin-evaporating to concentrate and obtain white product, dissolving in ethyl acetate, and slowly volatilizing to obtain single crystal of the product. The introduction of amantadine into the synthesized compounds has stable thermodynamic properties, and can release stress energy during thermal decomposition to form intramolecular hydrogen bonds, thus lowering sensitivity and improve thermal stability. The new compounds can be used in high-energy insensitive dynamites, low-signal propellants, gas generators, smoke powder and firecrackers. The method has such advantages as simple process, easy purification, no need for nitrogen protection, and no pollution.

The invention discloses novel environment-friendly degradable PVC artificial leather and a production process thereof. The novel environment-friendly degradable PVC artificial leather comprises hydroxamated polyvinyl chloride, modified talcum powder, decayed apples, citric acid, xanthan gum, copper chloride, a fabric substrate, synthetic resin, a plasticizer, a coupling agent and an anti-wrinkle agent. The hydroxamated polyvinyl chloride contains carbonyl and oximido at the same time, so that the phase compatibility between the components is improved; small molecular carbon compounds formed during degradation can attract bacillus subtilis, so that the degradation of the hydroxamated polyvinyl chloride is promoted; the talcum powder can improve the water contact tolerance of the resin; the citric acid modified talcum powder improves the toughness and tensile strength of the synthetic resin; phytosterol and the citric acid generate phytosterol ester as an artificial leather skin film, and the synthetic artificial leather has waterproof and oilproof effects due to good hydrophobicity and oleophobicity of the phytosterol ester; and the manufacturing process for preparing the artificial leather from the abandoned apples saves resources, protects the environment and increases the additional output value of the abandoned apples.

The invention relates to a methylene-bridged nitrogen-rich diheterocyclic compound, a derivative and a preparation method thereof. The preparation method of the methylene-bridged nitrogen-rich diheterocyclic compound comprises the following steps: 1, dissolving 1-acetonitrile-5-amino tetrazole in a NaOH aqueous solution, carrying out a reflux reaction at 100-105 DEG C, and separating out a productto obtain a precipitate; 2, dissolving the precipitate and diaminoguanidine hydrochloride in polyphosphoric acid, and carrying out an addition reaction at 110-130 DEG C; and 3, cooling the reaction solution, adjusting the pH value to 7-9, separating the product, dissloving the methylene-bridged nitrogen-rich diheterocyclic compound in low-temperature fuming nitric acid, reacting at room temperature, dropping the reaction liquid on ice to separate out the compound, respectively adding an organic alkali and a metal alkali after dissloving the compound, reacting the obtained mixed system at -5-5DEG C, reacting at room temperature, filtering the product, and drying to obtain metal salt and non-metal salt of the methylene-bridged nitrogen-rich ammonium nitrate compound.

The invention relates to the technical field of research and development and processing of fishing tools, in particular to a preparation method of modified chitosan-based bionic fish baits. The preparation method of the modified chitosan-based bionic fish baits, provided by the invention, has the benefits that the modified chitosan-based bionic fish baits are prepared by taking a modified chitosanacetic acid solution as a base material, taking modified corn starch and glass fibers as modifying agents and supplementing with stannous octoate, allicin and the like; firstly the modified chitosanacetic acid solution is prepared by taking shrimp shells as a raw material, then glass fibers are added in the base material, and the base material transfers stress among the glass fibers, so that thestrengths of the bionic fish baits are improved; the corn starch is simply treated with ammonium persulfate and acrylic acid, so that the enhancement in the dependence between the modified corn starch and the base material in a whole system is promoted; the corn starch is modified by utilizing a homemade dihydrosalicylate crystal; a benzene ring is introduced in a corn starch main chain after modification, the mechanical properties of the corn starch are improved; and in addition, the corn starch has excellent biodegradability, has no pollution to an environment and has a wide application prospect.

The invention relates to a methylene-bridged nitrogen-rich heterocyclic compound and derivatives thereof, and preparation methods thereof. The preparation method of the compound comprises the following steps: adding a hydroxylamine solution into an acetonitrile solution of 1-acetonitrile-5-aminotetrazole at low temperature, reacting at room temperature, separating the product to obtain a precipitate, dispersing the precipitate, sodium bicarbonate and cyanogen bromide into ethanol, reacting at room temperature for 10-14 hours, and separating and drying the product to obtain the methylene-bridged nitrogen-rich heterocyclic compound. The preparation method of the derivatives comprises the following steps: dissolving the methylene-bridged nitrogen-rich heterocyclic compound in fuming nitric acid at -5-5 DEG C at room temperature, reacting at room temperature to obtain a reaction solution, dripping the reaction solution on ice, and separating out a methylene-bridged nitrogen-rich ammonium nitrate compound on the ice; and dissolving a methylene-bridged nitrogen-rich ammonium nitrate compound, respectively adding organic alkali or metal alkali, reacting the obtained system at -5-5 DEG C for 10-30 minutes, finally reacting at room temperature for 30-60 minutes, filtering the product, and drying to obtain the non-metal salt and metal salt of the methylene-bridged nitrogen-rich ammoniumnitrate compound.