57results about How to "Molecular weight control" patented technology

The invention discloses a quick-curing high-strength single-component silane modified polyurethane sealing gum preparation method. The preparation method comprises the steps: adding polyether glycol into a reaction kettle which is provided with a thermometer and a stirrer and protected by dry nitrogen; starting stirring; warming to 120 DEG C; vacuum drying for dewatering for 2h; cooling to 40 DEGC or less; sequentially adding polyisocyanate, a first catalyst and a first plasticizer; warming to 45 to 60 DEG C; reacting and stopping reacting when a NCO% content reaches to 1% to 5%; cooling to 40 DEG C or less; adding a silane coupling agent into the reaction kettle and sealing ends; sampling and detecting NCO% every 15 minutes until the NCO% content is 0 to obtain SPU prepolymer; sealing, storing and standing for standby application. The preparation method disclosed by the invention has the advantages avoiding side reaction under high temperature, effectively controlling a molecular weight of the SPU prepolymer within a narrower range (generally 5000 to 9000), ensuring quality of the prepolymer and effectively improving the curing speed of SPU sealing gum.

The invention discloses polyether amine, a preparation method of a polycondensate containing a phosphorous acid group and application of the polycondensate as a cement dispersing agent. The polyetheramine has a polyether chain segment with steric hindrance property and hydrophilic-hydrophobic property, one end of the polyether chain segment is methoxyl-terminated while the other end of the polyether chain segment is amine monomer-terminated; the polyether chain segment is connected to a primary amino group N-H or a secondary amino group N-H of an amine monomer so as to present the characteristic of random grafting. Polycondensation reaction on a polycondensation monomer formed by grafting polyether amine on a benzene ring of a phenolic monomer and an aldehyde monomer as well as a phosphorous acid is carried out, so that a phosphite polycondensate is obtained; moreover, the polycondensate can be used as the cement dispersing agent, so that the polycondensate has a better dispersion effect.

The invention relates to a process method for preparing polyisobutene and a polymerization device. An integrated reactor consisting of a premixer, a supergravity reactor and a tubular reactor is used as a polymerization reactor; a mixed liquid containing a monomer and diluent and a mixed liquid containing initiator and diluent are introduced to the supergravity reactor after being premixed by thepremixer according to a ratio, and cationic polymerization reaction is initiated under the condition of supergravity, and the reaction liquid enters into the tubular reactor from an outlet of the supergravity reactor to continuously finish macroscopic polymerization reaction. The average molecular weight of the polyisobutene as the obtained product is controllable and ranges from 800 daltons to 5000 daltons, the molecular weight distribution index ranges from 1.8 to 2.5, and the content of a chain end alpha-double bond can be up to over 90%. By using the supergravity polymerization process provided by the invention, the microcosmic mixing, mass transferring and heat transferring processes of a reaction is greatly enhanced; compared with the traditional stirring polymerization method, the process method ensures that the average residence time of materials in the supergravity reactor is at least shortened to over 20-30 times; and in addition, the equipment volume is greatly reduced, andthe operating cost is reduced.

The invention relates to a method for preparing hydrolyzed collagen protein by fresh animal skin, which mainly comprises the following steps: animal skin processing; enzymolysis; solid particulate matter elimination; enzymolysis reaction-separation and coupling; nanofiltration concentration; spray drying; and the like. The invention has high finished product yield; in addition, the average molecular weight of a product is about 2000, the product is easier to absorb by human bodies and has no bitter taste.

The invention provides a preparation method for synthesizing brominated polycarbonate with dual catalysts. By using a dual catalyst system and capping with a monohydric phenol reagent, brominated polycarbonate with an average molecular weight of 2500-2800 can be obtained at normal temperature and normal pressure , has the characteristics of good thermal stability, high yield, controllable molecular weight, and low content of impurities such as chlorine.

The present invention relates to a preparation method of double-peak high-density polyethylene communication cable insulating material. It is characterized by that on the Mitsui chemical high-density polyethylene technological equipment a double-slurry polymerization reactors series-connected reaction process can be adopted. Said invention is an improvement of existent technological process, namely, the catalyst only is added into the first reactor, and in the first reactor the comonomer butylene-1 is not added, the added quantity of hydrogen is controlled, the molecular weight distribution and density of polymer produced by two reactors can be regulated so as to make first reactor polymer be low molecular weight high-density polyethylene, the second reactor polymer be high molecular weight high-density polyethylene so as to obtain polymer-grade polyethylene whose molecular weight is formed into double-peak distribution. After the adjuvant is added into the above-mentioned material and granulated, the communication cable insulating material product can be made up by utilizing large equipment.

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 belongs to the technical field of polysiloxane, and discloses vinyl polysiloxane as well as a preparation method and application thereof. The method comprises the following steps: (1) mixing 100 to 200 parts of DMC (dimethylcyclosiloxane) with 20 to 60 parts of methyl vinyl cyclosiloxane, and performing vacuum dewatering treatment to obtain a dewatered mixed monomer; (2) mixing the dewatered mixed monomer with 1 to 20 parts of an end-capping reagent, heating to 100 to 110 DEG C, adding 0.1 to 5 parts of a temporary catalyst, heating to 110 to 115 DEG C, performing heat preservation reaction for 1 to 3 hours, heating to 120 to 125 DEG C, performing heat preservation reaction for 3 to 5 hours, and continuously heating to 130 to 135 DEG C for reaction for 1 to 3 hours, so as toobtain a reaction product; (3) performing subsequent treatment on the reaction product, so as to obtain the vinyl polysiloxane, wherein the part is weight part. The method disclosed by the invention is simple, low in cost and high in monomer conversion rate, and is applied to synthesis and modification of silicone rubber and silicon resin and preparation of a releasing agent.

The present invention relates to silicone polymer ligands for binding to quantum dots. The silicone polymer ligands contain a multiplicity of amine, carboxy, and / or phosphine binding groups suitable for attachment to quantum dots. The present invention also describes a process for the preparation of quantum dot binding ligands.

The invention provides a method for preparing a sodium polyacrylate dispersant. The method comprises the following steps of mixing first acrylic waste liquid and a chain transfer agent, heating, dropwise adding an initiator and second acrylic waste liquid, and reacting for obtaining a reaction product; adjusting the pH value of the reaction product by adopting solid sodium hydroxide, thereby obtaining the sodium polyacrylate dispersant. According to the method, during the preparation of the sodium polyacrylate dispersant, the first acrylic waste liquid and the chain transfer agent serve as a base solution, the second acrylic waste liquid and the initiator are dropwise added to the base solution, and a manner that acrylic acid is dropwise added to part of the acrylic waste liquid is adopted, so that the phenomenon that molecular weights are unequal due to violent reaction is avoided; moreover, sodium polyacrylate is prepared from the acrylic waste liquid, so that the waste is recycled, and meanwhile, the production cost of the acrylic waste liquid is reduced.

The invention discloses a preparation method of a tremella fermentation extract and application thereof in cosmetics. According to the method, tremella and water are taken as raw materials, and the tremella fermentation extract is obtained by high-temperature fermentation, superspeed shearing and stirring, low-temperature fermentation and sterilization and centrifugal separation, wherein a high-temperature bacterium for high-temperature fermentation is selected from at least one of streptococcus thermophilus and streptococcus salivarius thermophilus; and a low-temperature bacterium selected for low-temperature fermentation is a bacterium obtained mixing yeast and lactobacilli. The tremella fermentation extract prepared with the method can be used as facial mask essence, can be further prepared into a facial mask for moisturizing skin and retaining moisture. The raw materials used in the invention are all additives acceptable in cosmetics, the tremella self (with tremella polysaccharide) has the effects of moisturizing skin and retaining moisture, after microorganism fermentation in a temperature-changing process, the tremella polysaccharide is higher in content and smaller in molecular weight in the extract, and absorption and skin moisturizing and moisture retention on the surface of human skin can be facilitated.

The invention discloses a preparation method of controllable high-molecular-weight MQ silicon resin. The preparation method comprises the following steps: (1) uniformly mixing a component A, a solventI and a catalyst to form mixed liquid C, dissolving a component B in a solvent II, and uniformly stirring and mixing to form mixed liquid D; (2) stirring the mixed liquid C at any temperature between30 DEG C and 80 DEG C at constant temperature, slowly dropwise adding the mixed liquid D for 30 to 60 min, and carrying out constant temperature reaction for 2 to 10 h at the end of dropwise adding;(3) adding a reaction inhibitor, stirring for 10 to 50 min, and distilling the mixture in vacuum to remove the solvent, thus obtaining the controllable high-molecular-weight MQ silicon resin. Preparation of the high-molecular-weight MQ silicon resin and control of the molecular weight can be realized only by adjusting a mole ratio of an active group of the component A to an active group of the component B. According to the preparation method, a few of side products are produced, and recycling of acid, byproducts and the like is not considered; the preparation method is short in production period and high in efficiency and can completely realize industrialization. The product disclosed by the invention is completely dissolved into a polarity or low-polarity solvent, so no problems of sediments and gel which are produced by the system are considered.

The invention relates to a manufacturing method of beaded polytrifluorochloroethylene resins, which comprises the following steps of: taking trifluorochlor oethylene, high-purity water, an organic dispersant and an initiator under the condition that the mass ratio of the trifluorochlor oethylene, the high-purity water, the organic dispersant and the initiator is 100:(500-1000): (50-200): (0.1-1); placing the high-purity water, the organic dispersant and the initiator in a reaction kettle, and at a stirring speed of 400-500 rmp, feeding the trifluorochlor oethylene into the reaction kettle; carrying out reaction on the obtained mixture for 4-6 hours under the conditions of 0.2-1 Mpa and 20-30 DEG C; and then continuing to react for 2-4 hours at a temperature of 50 DEG C and at a stirring speed of 100-200 rmp; and carrying out washing and drying on the obtained product so as to obtain a beaded polytrifluorochloroethylene resin with a diameter of 0.5-5 mm. The method disclosed by the invention is stable in polymerization rate and narrow in molecular weight distribution, no dust flying occurs in the process of production, and no further granulation treatment is required; the obtained polytrifluorochloroethylene resin is excellent in performances, and can be prepared into tubes, bars and profiles with more complicated shapes through melt injection molding; and no yellowing phenomenon occurs, therefore, the method has good social, economic and environmental benefits.

The invention discloses a dispersion type liquid mildew inhibitor. The dispersion type liquid mildew inhibitor is composed of certain amounts of propionic acid, ammonium propionate, and guanidine polymers, and a water locking agent is preferably added. The combination of the guanidine polymers and propionic acid plays a role in protection of carboxyl groups in propionic acid molecules, and shows a synergic effect in mildew inhibition effect promotion. A preparation method of the liquid mildew inhibitor is simultaneously disclosed. The liquid mildew inhibitor of the invention has the advantages of long mildew inhibition time, small application amount, and possessing of high economic benefits and social benefits.

The invention discloses an extraction method of sheep embryo active peptide, which sequentially comprises the following steps of: (1) fetching the fresh tissue of 6-16 week sheep embryo, cutting up and adding normal saline; homogenizing by a tissue homogenizing machine; and performing quick freeze thawing at -20 DEG C and 40 DEG C after the homogenization; (2) performing ultrasonic cracking: starting an ultrasonic probe every 30 seconds, letting the ultrasound last for 15 seconds, and repeating for 3-5 times; (3) performing low-temperature high-speed centrifugation for 30 minutes at 4 DEG C, and taking the supernate; and (4) performing centrifugal ultrafiltration of the supernate by use of a 5k ultrafiltration membrane, and clarifying to obtain the ultrafiltrate which is a sheep embryo active peptide solution. Without any acid and alkali treatment, the extraction method disclosed by the invention effectively avoids environmental pollution caused by a chemical method, and also avoids product pollution. Moreover, the method can collect multiple biologically active peptide components to the greatest degree, wherein the molecular weight of the active peptide is effectively controlled below 5,000D, and the bioactivity of the sheep embryo small-molecular peptide is maintained to the greatest degree.

This invention discloses a method for preparing poly (lactic acid)-based plasticizer. The method comprises: (1) melt-polycondensing lactic acid and small molecular dicarboxylic acid at a mol. ratio of 1:(10-100) in the presence of catalyst at 100-120 deg.C and 1-2 kPa for 3-5 h, and then at 140-180 deg.C and below 300 Pa for 3-15 h to obtain carboxyl-terminated prepolymer; (2) melt-polycondensing the prepolymer and polyalkylidene ether diol at a mol. ratio of (1:3)-(3:1) in nitrogen atmosphere at 150-230 deg.C and below 300 Pa for 3-20 h to obtain lactic acid-alkylidene ether multi-block copolymer. The method has such advantages as simple process, and abundant raw materials, and is suitable for industrialization.

The invention relates to a method for preparing linear macromolecules with controllable molecular weight by a solution polycondensation reaction. The method comprises five steps, i.e., preparing a reaction solution, controlling the reaction, computing product molecular weight, establishing a mathematical relation between reaction terminating current and the product molecular weight, and controlling the product molecular weight. Compared with the prior art, the method disclosed by the invention has the advantages that the viscosity of a solution polymerization system can be determined through the size of electric stirring device output current, and then, the molecular weight of a polymer is effectively controlled in a preparation process. The method has universality to solution polymerization reactions and is applicable to the preparation of various kinds of polymers such as polybenzimidazole, polyketone, polysulfone, polyether and polyamide. According to the method, the control on the molecular weight of the linear macromolecules to be prepared is accurate, and meanwhile, only a current measuring and displaying device (e.g., an ammeter) in series connection with an electric stirring device is additionally arranged outside a reaction device, so that the reaction device is simple, and the operation is easy. The method is of great significance for the preparation of the linear macromolecules with controllable molecular weight.

The invention discloses enzyme degradation-controllable anti-nonspecific protein adsorption polypeptide and a monomer and a preparation method thereof. By means of polycondensation of a dipeptide monomer containing protected carboxyl group and protected amino group at the side chain and subsequent deprotection, polypeptide with perfect repetitive positive and negative charges is prepared, and anti-nonspecific protein adsorption capacity of polypeptide is enhanced. Further, by polycondensation of a dipeptide monomer containing protected carboxyl group and protected amino group at the side chain and an amino acid monomer modified with protected carboxyl group and protected amino molecules simultaneously contained at the side chain at different ratios and subsequent deprotection, anti-nonspecific protein adsorption polypeptide with different enzyme degradation half-life is obtained, and regulation and control of enzyme degradation capability of the anti-nonspecific protein adsorption polypeptide is realized. By controlling the ratio of an end-capping reagent to a monomer, molecular weight of the target polypeptide is regulated and controlled. By the utilization of functional modification groups on the end-capping reagent, modification of different proteins, polypeptide and other polymer and different material surfaces can be realized.

The invention relates to a biological extracting and purifying method for beer yeast soluble 1,3-beta-D-glucan. An existing process for extracting soluble 1,3-beta-D-glucan in yeast cell walls is short of continuity. According to the method, in the same reaction system, yeast cells are degraded by ultrasonic wave, neutral protease, mannose and beta-glucanase, and soluble 1,3-beta-D-glucan with the molecular weight of 10 to 50kD is extracted by an ultrafiltration film with molecular cutoff of 10 to 50kD, so as to obtain soluble 1,3-beta-D-glucan with the molecular weight of 10 to 50kD. The method has the advantages of short technological process, high safety in production and fixed range of the molecular weight of a product; the obtained product has the characteristics of high solubility, good stability and high safety, and is suitable for the fields of food, medicines, cosmetics, pesticides, new materials, electronics, environmental protection and the like.

The invention discloses a synthesis method of related polypeptide, and belongs to the technical field of high polymer materials. With alkyl primary amine or aromatic amine as an initiator and N-substituted glycine-N-carboxy anhydrides as a monomer, solution ring opening polymerization of the N-substituted glycine-N-carboxy anhydrides is initialized under the condition of nitrogen flow to prepare the related polypeptide. Carbon dioxide generated in the reaction process is rapidly discharged in a manner of nitrogen flow, so that the reaction rate is improved; the polymerization reaction is facilitated; and the related polypeptide generated by the polymerization according to the method is relatively narrow in molecular weight distribution.

The invention provides a method for synthesizing a polylactic acid which has no metallic residue and has controllable molecular weight. The method is as follows: a reaction solvent is added into lactide to prepare a lactide solution the mol concentration of which is between 0.5 and 1.5 M under the protection of inert gas, and an initiator and catalyst are added into the lactide solution in turn, and subjected to polymerization for 0.25 to 2 hours, wherein the mol ratio of the lactide to the initiator to the catalyst is 6-350 to 1 to 0.06-0.35; a terminator is added into the lactide solution, and subjected to termination reaction for 10 to 20 minutes, wherein the mol ratio of the initiator to the terminator is 1 to 1-5; and methanol is prepared, wherein the volume ratio of the reaction solution to the methanol is 1 to 10-20, the reaction solution is dripped into the methanol to form polylactic acid deposit, and the polylactic acid deposit is separated out, filtered, subjected to methanol washing for 2 to 3 times, and subjected to vacuum drying for 24 to 48 hours at a temperature of between 20 and 40 DEG C to obtain the product. The synthesis method can be performed under the condition of room temperature and normal pressure, has high product yield and simple technique, does not require the conditions of heating and decompression, is easy to operate, and can effectively control the molecular weight of the polylactic acid product; and the product has no metallic residue and can be used as a medical material.

The invention belongs to the field of synthesis of a high molecular material and particularly relates to a method for synthesizing polyacrylonitrile by a Lewis base. The method is characterized by comprising the following steps of: under the protection of nitrogen gas, mixing 1,4-N,N-dimethylamino pyridine DMAP and dimethylamino pyridine DMSO to prepare a solution; then adding acrylonitrile into the solution to carry out polymerization reaction; reacting at a polymerization temperature of 0-60 DEG C for 1-48 hours, wherein the mass ratio of the dimethylamino pyridine to an acrylonitrile monomer is (7-500): 100; and the mass ratio of the 1,4-N,N-dimethylamino pyridine DMAP to the acrylonitrile monomer is (1.5-25): 100. The method has the beneficial effects that: an anion polymerization condition of the system is moderate and the acrylonitrile can be polymerized at a room temperature and a normal pressure; less side reaction exists and a product is pure; the control on the composition, the molecular weight and the distribution of a polymer is realized; and the polyacrylonitrile has a wide application prospect in the fields of polyacrylonitrile fibers, carbon fiber precursor materials, porous carbon material precursors and the like.

The invention discloses a cellulose grafted polyacrylamide composition with controllable molecular weight and an application thereof. According to the invention, through bonding of carboxyl and hydroxyl functional groups in CMC with an olefin bond of polyacrylamide to regulate and control the flocculation performance of PAM, the molecular weight of the cellulose grafted polyacrylamide compositioncan be controlled, so the product requirements of the cellulose grafted polyacrylamide composition under different conditions are met; and when the cellulose grafted polyacrylamide composition is applied in wastewater treatment, the flocculation performance can be improved, and the actual usage amount of the cellulose grafted polyacrylamide composition is reduced.

The invention provides a low-molecular dermatan sulfate. The number-average molecular weight of the low-molecular dermatan sulfate is 2,000 to 5,000 Da, and the weight-average molecular weight of thelow-molecular dermatan sulfate is 2500 to 6500 Da. The refined low-molecular dermatan sulfate obtained by the invention has narrower weight-average molecular weight distribution and data molecular weight distribution, is more suitable for human body absorption, and has a wide application prospect in antithrombotic drugs. The invention provides a process for refining the low-molecular dermatan sulfate. The process is a process for refining the low-molecular dermatan sulfate by an enzyme-ultrafiltration method. Particularly, the heparin sodium byproduct rich in dermatan sulfate is used as a rawmaterial, a bi ological enzyme-chondroitin sulfate B enzymecapable of degrading dermatan sulfate is utilized, an ultrafiltration method is combined, the comprehensive refining process is obtained, thereaction is mild, stable and controllable, the process repeatability is high, certain economic benefits and environmental protection effects are achieved, and the comprehensive refining process is suitable for industrial application and promotion.

The invention discloses arabinogalacto-oligosaccharide and preparation and application thereof. The arabinogalacto-oligosaccharide is composed of polysaccharide with a weight percentage content of 99%or above, the polysaccharide is composed of arabinose and galactose in a molar ratio of 1: 16, wherein the weight-average molecular weight of the arabinogalacto-oligosaccharide is 4,000 to 5,000 Da.According to the preparation, two-step enzymolysis is adopted, and the degraded arabinogalacto-oligosaccharide is separated and purified by adopting an ultrafiltration-nanofiltration coupled mode, sothe arabinogalacto-oligosaccharide with the weight-average molecular weight of 4,000 to 5,000 Da is directionally obtained; and purification time is greatly shortened, and the problem that oligosaccharide with a certain fixed molecular weight is not easy to separate in the prior art is solved. The branched chain substitution degree of the arabinogalacto-oligosaccharide is reduced, the biological functional activity of the arabinogalacto-oligosaccharide is obviously enhanced, and the arabinogalacto-oligosaccharide has an obvious in-vitro growth promoting effect on probiotics such as bifidobacteria, so the arabinogalacto-oligosaccharide can be used as functional oligosaccharide to the fields of food additives, health care products and medicines.

The invention discloses a chemical industry technical area preparing method to produce a low molecular weight rubber type modifier polymer, which comprises the following steps: 1. mixing polymeric monomer, modifier, trigger, emulsifier and agent in rightly weight percentage; 2. adding those into autoclave; 3. gauging conversion rate and discharging after eligible; wherein the modifier is unodor regular twelve carbon sulfhydrate and carbon tetrachloride composite modifier.

The invention relates to the technical field of coatings, in particular to a water-based single-component baking type polysiloxane coating and a preparation method thereof. The water-based single-component baking type polysiloxane coating consists of 5 to 13 percent of hydroxy acrylic resin, 25 to 50 percent of polysiloxane prepolymer, 1 to 3 percent of filler, 5 to 10 percent of deionized water, 1 to 6 percent of solvent, 13 to 31 percent of functional additive and 0 to 10 percent of cross-linking agent. The polysiloxane prepolymer is prepared from the following components in percentage by weight: 20 to 60 percent of nano silicon dioxide sol, 20 to 60 percent of alkoxy silane and 10 to 30 percent of silane end-capping reagent. According to the water-based single-component baking type polysiloxane coating disclosed by the invention, the hydroxyl acrylic resin and the polysiloxane prepolymer are compounded, so that the freeze-thaw stability and the storage stability of the coating can be improved, and the construction convenience of the baking type polysiloxane coating can be improved.

The invention provides a catalyst for synthesizing amide, especially N-mercaptoethyl-3-sulfydryl-propanamide, and a preparation method of the catalyst. The method comprises the following steps: mixing a titanium salt solution, a zinc salt solution and ammonia water, tetraborate and basic nickel carbonate, collecting precipitation, then roasting, dipping and roasting in sulfuric acid, and then mixing the roasted product with (triphenylphosphine) cobalt (I) nitro-hydride and a cyclopentadienyl iron solution. The invention further provides a method for synthesizing N-mercaptoethyl-3-sulfydryl-propanamide by using a mixed crystal solid acid carrier coordination catalyst, the synthesized N-mercaptoethyl-3-sulfydryl-propanamide can be used for the regulation of the molecular weight in polymerization, especially the addition polymerization, the molecular weight can be effectively controlled, and the production of the byproducts is reduced.

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.