49results about How to "High unit content" patented technology

The invention provides a preparation method of polycarbonate. The method comprises the following step of performing copolymerization on carbon dioxide and epoxide under the effects of a main catalyst and a cocatalyst so as to obtain the polycarbonate, wherein the main catalyst has a formula I structure; the cocatalyst comprises one or a plurality of kinds of quaternary ammonium salt, quaternary microcosmic salt and organic alkali; the amount ratio of substances of the main catalyst to the substances of the cocatalyst is 1:(0.2-4). Compared with the prior art, by the preparation method, aluminum porphyrin compositions are adopted as the main catalyst, the electronic environment of aluminum in a metal active center is regulated by changing a substituent group, so that the electronic environment has a higher activity in the copolymerization of the carbon dioxide and the epoxide; in addition, the main catalyst has a higher product selectivity in the copolymerization, and the molecular weight of the obtained polycarbonate is higher. The experimental result indicates that the transforming amount of a catalytic system can be as high as 5563 h<-1> when the copolymerization of the carbon dioxide and the epoxide are catalyzed by the aluminum porphyrin compositions.

The invention belongs to the field of high molecular materials and relates to a crystallizable polycarbonate material based on carbon dioxide and a preparation method thereof. The crystallizable polycarbonate material based on carbon dioxide is characterized in that carbon dioxide and cyclohexene oxide are copolymerized into a crystallizable polycarbonate material with a highly identical stricture under the action of a catalyst. The polycarbonate material has the following characteristics that the content of polycarbonate units in a polymer chain is 90-100%, the identical structure of the polymer is between 88.0% and 99.9%, the tested selectivity of an enantiomer of diol is between 88.0% and 99.9% after the polymer is hydrolyzed with a sodium hydroxide aqueous solution, and the crystallizable polycarbonate material can be obtained after the polymer is subjected to simple thermal treatment. The polycarbonate material provided by the invention has the advantages of high crystallization, high clarity and the like.

The present invention provides a polyester resin having 1,4-CHDA as the main dicarboxylic acid units, having isomerization of trans-1,4-CHDA suppressed in the esterification and polyconsensation reactions and having a high melting point and excellent heat resistance, and a process for its production. A polyester resin obtainable by preparing an oligomer by an esterification reaction of a dicarboxylic acid component containing 1,4-cyclohexane dicarboxylic acid as the main component, with a diol component, and polycondensing this oligomer in the presence of a polycondensation catalyst; and a process for producing a polyester resin characterized in that the esterification reaction is carried out by means of a basic compound, and then, the polycondensation reaction is carried out by means of a polycondensation catalyst. In the resent invention, T0 and Tp satisfy 0 |{(T0-Tp)/T0}100 |12 where T0 is the mol% of the trans form in the 1,4-cyclohexane dicarboxylic acid contained in the starting material, and Tp is the mol% of the trans form in the 1,4-cyclohexane dicarboxylic acid units contained in the obtainable polyester resin.

The invention discloses a supported double-metal cyanide catalyst and a preparation method and application thereof. The supported double-metal cyanide catalyst uses hydrotalcite as the supporter, double-metal cyanide is supported on the supporter, and the supported double-metal cyanide catalyst uses polyethylene glycol as the chelating agent. The preparation method includes: using zinc chloride and metal cyanide as precursors, dripping the aqueous solution of central metal into a ligand substance solution for reaction, adding the supporter and the chelating agent at the same time, and performing centrifugal separating and drying to obtain the supported double-metal cyanide catalyst. The invention also provides a preparation method using the supported double-metal cyanide catalyst to prepare carbon dioxide-epoxide copolymer. Compared with same-type catalysts, the supported double-metal cyanide catalyst has the advantages that the catalyst is high in catalyzing activity and good in product selectivity; when the catalyst catalyzes carbon dioxide to have copolymerization reaction with epoxides, the carbonic ester unit content of the copolymerization product is high, the cyclic carbonate content of the copolymerization product is low, and the catalyst is high in actual application value and promising in market prospect.

The invention provides a titanium catalyst with a structure represented by the formula (I). The catalyst can be efficiently copolymerized with a catalytic epoxy compound and carbon dioxide and is high in selectivity; furthermore, polycarbonate prepared by the catalyst provided by the invention has a non-toxic effect and can be applied to the field of food and medical packaging.

The invention belongs to the field of the high polymer material, which relates to a class of carbon dioxide based high polymer material with the crystallization performance. The carbon dioxide based high polymer material with the crystallization performance is characterized in that end position alkyleneoxide containing an electrophilic group and carbon dioxide are copolymerized to form crystallizable polycarbonate material with an identical height structure under the action of catalyst. The polycarbonate has the following characteristics that the content of a carbonate ester unit in a polymer chain is 90-100%, and the identical structure of the polymer is between 80.0% and 99.9%; after the polymer is hydrolyzed by sodium hydroxide aqueous solution, the enantiomer selectivity of glycol obtained by measurement is 80.0% and 99.9%; and the polycarbonate with the crystallization performance can be obtained through carrying out simple thermal treatment on the polymer. The polycarbonate material provided by the invention has the advantages of big possibility of crystallizing, strong thermal deformation resistance and the like.

The invention provides a nanometer water ion air purifier and relates to the field of air purification. The air purifier comprises a shell, a draught fan, an air purifying module and a nanometer water ion generation device. An air inlet is formed in the bottom of the shell, an air outlet is formed in the upper portion of the shell, and an air channel is defined in the shell by the air inlet and the air outlet. The draught fan in the air channel is used for introducing external air from the air inlet and delivering out the air from the air outlet. The air purifying module arranged in the air inlet section of the air channel is used for purifying the external air entering the air channel from the air inlet. The nanometer water ion generation device is arranged in the air outlet section of the air channel and used for generating nanometer-order particle size water ions. The nanometer water ion air purifier can stimulate a large quantity of nanometer water ions with negative charges, rich reduction substances are contained, the nanometer water ions containing the reduction substances can suppress oxidation of the skin and the surface and interior of the hair to prevent the issues of skin and hair dryness, hair split ends and the like while the external air is purified, and thus the purposes of beautifying, hair maintenance and lung clearing are achieved.

The invention discloses a preparation method of a streptococcal enzyme capsule. The method is characterized in that the capsule is packed and can be released at a fixed point in small intestine duringeating, and sparassis crispa polysaccharide cannot be damaged by gastric acid, and thus the bioavailability of the sparassis crispa polysaccharide is improved; and meanwhile, the addition of a largenumber of corrigents can be avoided, and the unit content of streptococcal enzyme is obviously increased; the streptococcal enzyme grinded by a plurality of steps can be better absorbed by small intestine after being released; various beneficial components in the streptococcal enzyme can be prevented from being damaged by an ultralow-temperature freeze drying technique; and the packed streptococcal enzyme capsule is convenient to carry and eat in daily life.

The invention relates to the technical field of catalysts, in particular to a catalyst for preparing polyol as well as a preparation method and application of the catalyst. The preparation method of the catalyst for preparing polyol comprises the following steps: under the action of a first initiator, carrying out polymerization reaction on double metal cyanide and epoxide to obtain the catalyst for preparing polyol, wherein the first initiator comprises one or more of an active hydrogen-containing compound and an active hydrogen-containing polymer. The catalyst prepared by the invention can be used for copolymerization of carbon dioxide and epoxide, and the obtained copolymerization product has high carbonate unit content and low cyclic carbonate content.

The invention discloses a method for continuously producing polycarbonate-polyether polyol in a channelization mode by a liquid phase method, wherein the method comprises the following steps: (1) pumping a raw material from an inlet of a channelization reactor, making an initiator, an epoxy compound and carbon dioxide contact in the channelization reactor in the presence of a catalyst, and carrying out polymerization reaction; and (2) enabling part or all of the polymerization reaction product material flow in the step (1) to flow through a cooling section group, separating out part of polycarbonate-polyether polyol, and continuing to carry out polymerization reaction on the rest of the polymerization reaction product material flow in the channelization reactor, or circulating back to thestep (1), wherein the catalyst is a zinc-cobalt double-metal cyanide complex catalyst obtained by reacting water-soluble metal salts of zinc and cobalt in a water-soluble solvent, when the catalyst issynthesized, the catalyst is modified by mixed acid, and the organic acid is selected from any one or more of succinic acid, glutaric acid, phthalic acid, iminodiacetic acid, pyromellitic acid and butane tetracarboxylic acid.

The invention provides a health care food and making method thereof, wherein the health care food comprises notoginseng, ganoderma lucidum, vitamin E, maize oil.

The invention discloses an industrial production method of rough glycyrrhizic acid. The industrial production method comprises the following steps: drawing liquorice roots into shreds or powder through a drawing machine; extracting by taking hot water as an extracting solvent to obtain an extracting solution; cooling extracted material liquid; after finishing cooling, centrifuging to obtain clarified material liquid; carrying out acid regulation on the centrifuged material liquid in an acid tank; after finishing the acid regulation, standing and carrying out acid precipitation for 2h to 5h; filtering material liquid subjected to the acid precipitation; washing a filtered solid with water to obtain a wet product; drying the wet product to obtain a rough glycyrrhizic acid product. By adopting hot water countercurrent circular extraction and combining a cooling and impurity removing process, a water resource is saved and the extraction rate of the product is guaranteed; a post-period purification process is simple and easy to operate and the unit content of the obtained rough glycyrrhizic acid product is more than or equal to 45 percent; industrial production is easy to realize.

The invention discloses a method for continuously producing polypropylene carbonate by a preheating liquid phase method in a channelization manner, which comprises the following steps: (1) feeding rawmaterials including propylene oxide and a catalyst into a premixing tank according to a certain proportion, uniformly mixing, and pumping into a channelization reactor; (2) preheating carbon dioxideto 40-150 DEG C, pumping into a channelization reactor, and pressurizing to 1-15 MPa; (3) heating to 70-150 DEG C to enable epoxypropane and carbon dioxide to be in contact in a pipelined reactor in the presence of a catalyst, and carrying out a polymerization reaction; (4) after part or all of the polymerization reaction product material flow flows through a cooling section group, separating outpart of the polypropylene carbonate from the polymerization reaction product material flow, and circulating the rest of the polymerization reaction product material flow to the step (1); wherein the catalyst is modified by mixed acid, and the zinc-cobalt double metal cyanide complex catalyst is obtained by reacting water-soluble metal salts of zinc and cobalt in a water-soluble solvent.