82results about How to "Various structural changes" patented technology

The invention discloses a chiral tetra-amino aniline ligand, and a preparation method and application of an aluminum compound thereof. The structural formula of the ligand is represented as the formula (A), wherein R1 is alkyl in a C1-C4 straight chain branched chain structure. The aluminum coordination compound of the chiral tetra-amino aniline ligand can efficiently catalyze ring-opening polymerization reactions of lactide. The ligand and the aluminum compound of the ligand are simple to synthesize, high in product yield coefficient and stable in property, simultaneously catalyst activity is high, selectivity is good, the performance of an obtained polymer is good, and molecular weight and stereoselectivity of the polymer can be regulated by control of polymerization reaction conditions.

The invention relates to a forming method for a thermoplastic composite. The forming method comprises the steps of firstly cutting a thermoplastic film and a cloth material into predetermined shapes respectively, wherein the thermoplastic film has an adhering layer and a surface layer; the surface layer has a higher melting point than that of the adhering layer; then laminating the thermoplastic film and the cloth material on a carrier to make the adhering layer of the thermoplastic film face to the cloth material; then heating to melt the adhering layer and soften the surface layer; vacuumizing from the carrier so as to absorb the thermoplastic film and the cloth material downward and press from top to bottom by using a press-fit member, so as to permeate the adhering layer of the thermoplastic film into the cloth material to form tight adhesion. When the carrier is provided with a plurality of convex-concave patterns and the surface layer of the thermoplastic film faces to the top surface of the carrier, clear stereoscopic patterns corresponding to the convex-concave patterns can be formed on the surface layer; and the cloth material and the thermoplastic film can be combined after being cut into required shapes, so that the thermoplastic composite of the thermoplastic film and the cloth material with different shape combinations can be manufactured.

The invention discloses a method for manufacturing a mobile phone casing with a concave side wall, comprising: an external mold manufacturing step, an internal mold manufacturing step, an impregnated fiber layer molding step, a heating forming step and a demolding step. Thus, by using an impregnated resin fiber layer as a forming material of the mobile phone casing, and matched to a forming mold formed by an elastic internal mold and a hard external mold, the method makes the side of the mobile phone casing break through the limit of demolding, so as to provide the mobile phone casing with various side walls, and the usage of the elastic internal mold makes it more reliable and rapider to form the mobile phone casing with the concave side wall, thereby reaching the purpose of form the concave side wall of the mobile phone casing.

The invention discloses a preparation method of polycaprolactone. The method comprises the following steps: mixing a catalyst, an organic solvent and caprolactone; carrying out ring-opening polymerization in the presence of anhydrous and anaerobic inert gases; treating a reactant to obtain polycaprolactone after reacting, wherein the catalyst is an amido anilino group lithium compound. With the amido anilino group lithium compound as a catalyst, the preparation method is good in reaction controllability, mild in condition, high in reaction rate and high in catalytic activity; polymerization reaction can be carried out without adding an alcohol-assisted catalyst; and the obtained polycaprolactone is controllable in molecular weight, high in productivity and few in metal residues. In addition, the polymerization reaction process is simple; a general solution polymerization method can be adopted; through control on polymerization reaction conditions, the molecular weight of the polymer can be regulated and controlled; and the obtained polymer is narrow in molecular weight distribution, has excellent physical and chemical characteristics, and can meet the requirements of the market.

The invention relates to a preparation method of an environmental protection coating of a SiCf / SiC composite material guider blade. The preparation method comprises the following steps: preheating a SiCf / SiC composite material guider blade matrix, and performing PS-PVD (Plasma Spraying-Physical Vapor Deposition) to prepare a Si adhesive layer, a mullite transitional layer, a Yb2SiO5 environmental barrier layer and a La2Zr2O7 heat resistant layer in sequence, wherein the environmental protection coating can be applied to a gas environment at 1,400 to 1,700 DEG C. Preparation of the Si adhesive layer, the mullite transitional layer, the Yb2SiO5 environmental barrier layer and the La2Zr2O7 heat resistant layer of the environmental protection coating is completed on the same equipment; the temperature of the matrix is effectively controlled through heating of a PS-PVD spraying gun, so as to prevent amorphous reaction in a deposition process of the mullite transitional layer; the added heat resistant layer enables the environmental protection coating to adapt to the gas environment at 1,400 to 1,700 DEG C; therefore, the preparation method is applicable to preparation of the environmental protection coating of a high-performance guider blade. The preparation method has the advantages that the preparation process is simple, easy to operate, high in stability, wide in applicable temperature range and wide in application range.

The invention discloses a four-chain amido anilino group ligand, an aluminium compound of the ligand, a preparation method of the ligand and application of the ligand. A constitutional formula of the ligand is shown in a formula A, and an R1 in the formula is alkyl groups of C1-C4 linear chains or branch chain structures. The ligand and the aluminium compound are simple in synthesis, high in product yield and stable in property, simultaneously a catalyst is high in activity, molecular weight of a polymer can be controlled through control of polymerization reaction conditions, selectivity is wide, and market needs can be met.

The invention discloses an engine connecting rod, which comprises a connecting rod body and a connecting rod cover, and the connecting rod body and the connecting rod cover are fixed by bolts. The connecting rod body and the connecting rod cover are provided with mutually intersecting and corresponding convex teeth and grooves, and the connecting rod body and the connecting rod cover are positioned and connected by engaging the convex teeth and the grooves; A cross shape is formed between the grooves; the convex teeth can be involute teeth, trapezoidal tooth shapes, arc tooth shapes or other arbitrary polygonal and arc tooth shapes, and the grooves are some kind of teeth corresponding to the convex teeth shape; the intersecting protruding teeth and grooves on the connecting rod body and the connecting rod cover can be multiple; the beneficial effects of the present invention: the structure changes are rich, and corresponding structures can be set according to different needs; At the same time, the reliability, durability and safety of the engine connecting rod are further improved.

The invention belongs to the field of pharmaceutical chemistry, and particularly relates to pyridazinone compounds as shown in general formula I or isomers thereof or pharmaceutically acceptable salt, ester prodrug or solvate thereof, a preparation method thereof, a medicinal composition and application thereof in preparation of a tyrosine kinase inhibitor (especially c-Met inhibitor). The compounds or the medicinal composition thereof serving as a tyrosine kinase inhibitor (especially c-Met inhibitor) can be used for preventing and / or treating neoplastic diseases related to c-Met abnormality.

The preparation method for Mohr photon crystal comprises: rotating two photon crystals with same periodic structure for some angle to overlap and form the Mohr photon crystal; exactly, using crystal of opal structure opposite to polystyrene or PMMA or silicon dioxide to self-assemble and ordered array into ball of nano or micron level, or using crystal of anti-opal structure opposite to powder dielectric material, or using microtechnique opposite to membrane dielectric material. This invention has variable structure forms to cut cost and improve development and preparation efficiency.

The invention relates to a novel 45-degree wing-angle G-section switch cabinet body which is characterized in that a main body frame adopts a square frame-type structure comprising four stand columns and eight cross beams arranged in an up-down manner; the stand columns are made of reinforced open sections; the cross beams are made of G-sections with 45-degree wing angles; the openings of the sections are inward; the joints of the three parts are subjected to frame mounting by sheet metal tee joint parts; the stand columns are fixed with the cross beams through positioning and fixation of the sheet metal tee joint parts and the positioning holes and indenting counter bores of the stand columns as well as the sheet metal tee joint parts and the positioning holes and indenting counter bores of the cross beams, and positioning of the bayonets of the stand columns and the cross beams; functional modulus square holes and round holes are uniformly formed in the stand columns and the cross beams. The cabinet body adopts the modulus reinforced open sections of 20 mm and the G-sections with the 45-degree wing angles, and is relatively compact and relatively high in utilization rate in comparison with a common modulus design of 25 mm; the square holes and the round holes with the diameters of 5.3 mm are uniformly formed in the central axes of the short edge sides of the sections at an interval of 1 / 2 modulus.

The invention discloses a method for catalyzing caprolactone polymerization by a binuclear chiral amino imine magnesium complex. The binuclear chiral amino imine magnesium complex is taken as a catalyst, epsilon-caprolactone is taken as a raw material, epsilon-caprolactone polymerization is catalyzed under the anhydrous and anaerobic conditions and under gas protection, and polycaprolactone is obtained. Caprolactone ring-opening polymerization is performed by adopting own developed binuclear chiral amino imine magnesium complex as the catalyst, a preparation method of the binuclear chiral amino imine magnesium complex catalyst is simple, the cost is low, the product yield is high, the catalyst structure is diversified, metal-center magnesium coordinates with N,N atoms of ligands, catalyticactivity is high, a promoter is not needed, the reaction rate is high, and an obtained polymer has narrow molecular weight distribution, controllable molecular weight and high yield.

The invention relates to a multifunctional desk and aims to solve the technical problems that the existing desks are inconvenient for book placing, storing and reading and single in structure. The desk comprises support legs and a base. Desk boards are disposed on the base. A cavity for storing objects is formed between the desk boards and the base. The desk is characterized in that the desk boards include a first desk board and a second desk board which can be turned over relative to the base, the second desk board is located on the front side and hinged to the first desk board, the second desk board independently turned backwards relative to the first desk board, a turning device is disposed between the second desk board and the base, the turned-over second desk board is used for placing books, and reading and writing are facilitated. In addition, the same functions of the desk can be achieved by multi-user desk boards. The modified multifunctional desk suitable for being used as a desk is variable in structure, and convenient for reading and writing, widely applicable to books.

The invention relates to a novel 45-degree-wing-angle G sectional material switch cabinet. A main body frame of a cabinet body is of a square frame-type structure composed of four stand columns and eight vertical main beams. The stand columns are made of reinforcement type open sectional materials, the main beams are made of 45-degree-wing-angle G sectional materials, and through fixing and positioning between metal plate tee joint parts and positioning holes and indenting counter bores of the stand columns as well as between the metal plate tee joint parts and positioning holes and indenting counter bores of the main beams, and positioning connecting between bayonets of the stand columns and the main beams, the stand columns and the main beams are fixed together. Side beams are fixedly and horizontally installed between the stand columns, and the two ends of each side beam are fixedly installed on the stand columns through protrusive connecting parts. An installing plate is vertically and fixedly installed between every two vertical adjacent side beams, and the two ends of each installing plate are fixedly installed on the corresponding side beam through connecting frames. The four corners of the switch cabinet are of wrapping-connecting assembly structures and are mainly formed by the stand column sectional materials, the main beam sectional materials and the metal plate tee joint parts in an inside and outside matching mode. The tee joint parts are concealed inside the wrapped corners composed of the main beams and the stand columns, the switch cabinet is attractive and flat in shape, the weight is reduced by over 60% compared with tee joint parts made of common aluminum alloy materials in a cast mode, and the cost can be lowered by over 90%.

The invention discloses dual-nucleus chiral amine-imine magnesium complex and a preparation method and application thereof. The dual-nucleus chiral amine-imine magnesium complex has a structural formula shown as formula I, which is shown in the description, wherein R is hydrogen, methyl group, ethyl group or isopropyl group. A dual-nucleus amine-imine catalyst herein is made by one-pot reaction ofa ligand, Mg(nBu)2 and benzyl alcohol; the preparation method is simple; the cost is low; the product yield is high; the compound, the catalyst, herein has variable structure; the metallic center magnesium can be coordinated with N,N atoms of the ligand to form the catalyst for ring-opening polymerization of cyclic lactones; the catalytic activity is high, stereoselectivity is good, no co-catalyst is required, the reaction speed is high, polymerization operation is simple, and the polymerization product has narrow molecular weight distribution, controllable molecular weight and high yield; the catalyst is widely applicable to ring-opening polymerization of cyclic lactones and is very ideal.

The invention discloses a multifunctional bis(benzimidazole)naphthalene fluorescent chemical sensor and its application. The sensor is prepared from a bis(benzimidazole)naphthalene compound and halogenated hydrocarbon as raw materials through a simple and easy N-alkylation substitution reaction. Through multiple position substitution of the bis(benzimidazole)naphthalene as the raw material, the multifunctional benzimidazolyl fluorescent chemical sensor is diversified in structure. According to different structural features of the multifunctional benzimidazolyl fluorescent chemical sensors, based on fluorescence quenching effects of different analysis species, the multifunctional bis(benzimidazole)naphthalene fluorescent chemical sensor aiming at identification of different metal ions (especially such as Ag<+> and Fe<3+>) and pH detection is screened and is used for differential identification of Ag<+> and Fe<3+> in a series of metal cations or monitoring of pH under strong acid conditions of pH less than 4.

The invention discloses a method for catalyzing glycolide polymerization by a binuclear chiral amino imine magnesium complex. The method comprises following steps: the binuclear chiral amino imine magnesium complex is taken as a catalyst, glycolide is taken as a raw material, glycolide polymerization is catalyzed under the anhydrous and anaerobic conditions and under protection of gas, and polyglycollide is obtained; the catalyst is the binuclear chiral amino imine magnesium complex. A glycolide ring-opening polymerization is performed by adopting own developed binuclear chiral amino imine magnesium complex as the catalyst, a preparation method of the catalyst is simple, the cost is low, the structure is diversified, metal-center magnesium coordinates with N,N atoms of ligands, catalytic activity is high, a promoter is not needed, the reaction rate is high, and a polymer has narrow molecular weight distribution and controllable molecular weight.

The invention relates to a warp-knitted fully-shaped side-seam-free T-shirt and a weaving method thereof. The warp-knitted fully-shaped side-seam-free T-shirt comprises a collar part, shoulder part, shoulder-connecting sleeve parts, a main body part, side seam part and a lower hem part and consists of a front piece and a back piece. The warp-knitted fully-shaped side-seam-free T-shirt is characterized in that the front piece and the back piece on two sides of the collar part form shoulder connection through thick sewing contextures of the shoulder parts, the cuff zones of the shoulder-connecting sleeve parts are of thickness contextures, and the front piece and the back piece on the cuff edges of the shoulder-connecting sleeve parts and the lower edges of sleeves form sleeve part connection through thick sewing contextures. The front piece and the back piece of the large body part form side seams through edge connecting contextures, and the side beam parts are of thickness contextures of crossed square continuous contextures. A main body of the lower hem part is of a thickness contexture, and the lower edge of the lower hem part form a lower hem sewing part by adopting a separated structure and a thick sewing contexture. The collar part adopts a thick contexture. The main body contextures of the shoulder-connecting sleeve parts and the contexture of the large body part are mainly of thickness contextures to intersperse a mesh contexture. The warp-knitted fully-shaped side-seam-free T-shirt adopts a one-piece type shoulder-connecting sleeve style cylindrical structure, and no cutting or sewing process is needed.

The invention relates to an improved multifunctional simple chair and a use method thereof. The improved multifunctional simple chair solves the technical problem of a poor structure design of the same type of the existing product. The improved multifunctional simple chair comprises a back plate, a seat body, a seat rack, a back rack and an extension foot. A foot rest of the extension foot is in a shape of U and the foot rest parts at two sides of the extension foot are located at the outer side of the seat rack and are respectively provided with support sleeves. The back rack and the support sleeves are dismountable. Two ends of the U-shaped opening of the foot rest are respectively and adjustably connected to the seat rack so that the position of the extension foot can be adjusted and the support sleeves support the back rack through the back rack. The extension foot can be adjusted through movement and can also be adjusted through folding, rotation, turning-over, dismounting / dismounting or expansion / retraction, or through combination of some of the above methods. The extension foot can be adjusted through multiple methods such as hinging, folding, retraction or expansion, an extension foot and a seat tube can be avoided and the back rack is directly connected to an upper casing pipe of the beat rack. The improved multifunctional simple chair can be used as an arm chair, a stool, a table-stool integrated chair, a freestanding table, a platform table and a computer table-stool structure.

The invention discloses a method of utilizing dinuclear amine imine magnesium complex to catalyze lactide polymerization. The method includes: taking the dinuclear ammine imine magnesium complex as acatalyst and lactide as a raw material to catalyze lactide polymerization without water and oxygen and under gas protection to obtain polylactide. The dinuclear amine imine magnesium complex which isown-developed is taken as the catalyst for lactide ring-opening polymerization reaction, the catalyst is simple in preparation method, low in cost, diverse in structure and high in catalytic activity,three-dimensional selectivity and reaction rate, no cocatalyst is needed, and metal center magnesium is coordinated with N, N atoms of ligand, so that the catalyst is quite ideal. Polymer obtained byreaction is narrow in molecular weight distribution, controllable in molecular weight and high in yield and selectivity.

The invention discloses a method of catalyzing polymerization of lactide by using an anilido-imine magnesium complex. The method comprises the step of catalyzing polymerization of lactide in a water-and oxygen-free condition and under protection of inert gas by taking the anilido-imine magnesium complex as a catalyst and lactide as a raw material to obtain polylactide. By carrying out a ring-opening polymerization reaction on lactide by taking the independently researched and developed anilido-imine magnesium complex as the catalyst, the preparation method of the catalyst is simple, the costis low, and the structure changes are diversified. The metal center magnesium coordinates with N, N atoms of a ligand, so that the catalyst is high in activity, high in stereoselectivity, free of a cocatalyst and high in reaction speed, and is the quite ideal catalyst. When the ring-opening polymerization reaction is carried out on lactide by the independently researched and developed anilido-imine magnesium complex, the molecular weight of the polymer obtained by the reaction is narrow in distribution and controllable, and the polymer is high in yield, high in selectivity and has a very goodapplication prospect.

The invention relates to an environment-friendly plant bactericide, which comprises an effective component namely a 2-methyl-4-trifluoromethyl-5-thiazole formamide compound or a pharmaceutically acceptable salt thereof, and one or more of pharmaceutically acceptable auxiliary materials. The 2-methyl-4-trifluoromethyl-5-thiazole formamide compound is prepared by taking 1-(3,4-dimethoxyphenyl)-2-(4-methoxyphenoxy) ethylamine and 1-(3,4-dimethoxyphenyl)-2-(4-methylphenoxy) ethylamine as raw materials, and making the raw materials carry out one-step reaction with 2-methyl-4-trifluoromethyl-5-thiazole formic acid in the presence of an alkali, a condensing agent and an organic solvent. The prepared environment-friendly plant bactericide has certain inhibitory activity on sclerotinia sclerotiorum.

The invention relates to a multifunctional comfortable desk. The multifunctional comfortable desk is designed to solve the technical problems that books can not be conveniently placed, stored and read on an existing desk which is single in structure. The desk comprises supporting legs and a base. A desk plate is arranged on the base, and a cavity used for containing objects is formed between the desk plate and the base. The multifunctional comfortable desk is characterized in that the desk plate comprises a first desk plate body and a second desk plate body arranged in an overturning mode relative to the base, the second desk plate body is located on the front side of the desk plate, the first desk plate body is connected with the second desk plate body through a hinge, the second desk plate body independently rotates backwards relative to the first desk plate body, and a turnover device is arranged between the second desk plate body and the base; the second desk plate body is used for containing books after being turned over, and therefore a user can read the books and write at the same time conveniently. In addition, the desk can have the functions through the adoption of the combined structure of multi-user desk plates. The multifunctional comfortable desk is diverse in structure, brings convenience to reading and recess learning, is wide in application range for the books, and is suitable for being used as a desk and the structural improvement of the like product.

The invention discloses a ceiling structure for installing an electric appliance of a bathroom. The ceiling structure mainly comprises a ceiling and the electric appliance, wherein the ceiling consists of an edge collecting line and a buckling plate, and the electric appliance is arranged on the surface of the ceiling; the electric appliance consists of an electric appliance host and an electric appliance panel, and the electric appliance panel is connected together with the edge collecting line to form the whole electric appliance; the electric appliance is installed at a higher position which can save the overhead space and is higher than the plane of the buckling plate; and a euphotic rim is arranged at the height side of the electric appliance higher than the buckling plate, and a light emitting diode (LED) luminous source or a traditional illumination light source capable of emitting light outwards from the euphotic rim of the electric appliance is arranged in the corresponding euphotic rim of the electric appliance. The ceiling structure has the characteristics of simplicity, convenience for use and installation, many integral structural changes, capability of meeting requirement of indoor decoration and the like.

The invention discloses a chiral aluminum complex containing acetylacetone derivative and a preparation method and application thereof; the chiral aluminum complex has a structural formula shown as formula I that is shown in the description, wherein R1 is trifluoromethyl or methyl, and R2 is phenyl, trifluoromethyl or methyl. The chiral aluminum complex as a catalyst is acquired by subjecting a ligand and trimethylaluminum to reaction; the preparation method is simple, the cost is low, and product yield is high; the chiral aluminum complex has special structure that is variable; divalent N,N,O,O coordination of metallic center aluminum and the ligand may serve as the catalyst for cyclic lactone ring opening polymerization; the catalyst has high catalytic activity, good stereo-selectivity and high reaction speed; polymerization is simple to perform, an obtained polymer has narrow molecular weight distribution, controllable molecular weight and high yield and is widely applicable to cyclic lactone ring opening polymerization and is a very ideal catalyst.

The invention discloses a method for catalyzing caprolactone polymerization by utilizing an aluminum complex containing a salicylaldehyde group. The method comprises the following steps: mixing a catalyst, an organic solvent, benzyl alcohol co-catalyst and caprolactone, carrying out ring opening polymerization reaction under the protection of anhydrous oxygen-free and inert gas, and then treatingthe reaction product to obtain polycaprolactone. According to the method disclosed by the invention, the self-developed aluminum complex containing the salicylaldehyde group is used as a catalyst to carry out the ring-opening polymerization reaction of caprolactone, the preparation method of the salicylaldehyde-containing aluminum complex catalyst is simple, the cost is low, the product yield is high, and the structure of the catalyst is diversified, the metal center aluminum coordinates with two-valent N,N,O,O of the ligand, the calytic activity is high, the stereoselectivity and the reactionrate are high, and the obtained polymer is a benzyloxy-terminated polymer, the molecular weight distribution is narrow, the molecular weight is controllable, the yield is high, and the market demandis met.

The invention discloses a method of utilizing dinuclear amine imine magnesium complex to catalyze caprolactone polymerization. The method includes: taking the dinuclear ammine imine magnesium complexas a catalyst and epsilon-caprolactone as a raw material to catalyze epsilon-caprolactone polymerization without water and oxygen and under gas protection to obtain poly caprolactone. The dinuclear amine imine magnesium complex which is own-developed is taken as the catalyst for caprolactone ring-opening polymerization reaction, the catalyst is simple in preparation method, low in cost, high in product yield, diverse in structure and high in catalytic activity, three-dimensional selectivity and reaction rate, metal center magnesium is coordinated with N, N atoms of ligand, and no cocatalyst isneeded; obtained polymer is narrow in molecular weight distribution, controllable in molecular weight and high in yield.

The invention discloses a method for catalyzing polymerization of caprolactone by using an asymmetric aluminum complex containing an o-phenylenediamine group, and the method comprises the following steps: mixing a catalyst, an organic solvent and a benzyl alcohol co-catalyst with the caprolactone for ring-opening polymerization under anhydrous oxygen-free inert-gas protection conditions, and afterthe reaction, treating the reaction product to obtain polycaprolactone; wherein the catalyst is the asymmetric aluminum complex containing the o-phenylenediamine group. The self-developed asymmetricaluminum complex containing the o-phenylenediamine group is used as the catalyst, the catalyst is simple in preparation method, the cost is low, the yield is high, the catalyst structure is varied, metal center aluminum is coordinated with bivalent N, N, O and O of a ligand, and the catalyst has high catalytic activity, high stereoselectivity and fast reaction rate. The obtained polymer is a benzyloxy-terminated polymer with narrow molecular weight distribution, controllable molecular weight and high yield, and can meet the needs of the market.

The invention discloses an asymmetric aluminum complex containing o-phenylenediamine group and a preparation method and application thereof, the asymmetric aluminum complex has the structural formulaof formula I, wherein R is hydrogen, C1-C4 alkane or halogen. An asymmetric aluminum complex catalyst containing the o-phenylenediamine group is obtained by reacting a ligand with trimethylaluminum, apreparation method is simple, low in cost and high in product yield, the asymmetric aluminum complex has a special structure, and various structural changes, metal center aluminum can be coordinatedwith divalent N, N, O and O of the ligand, the asymmetric aluminum complex catalyst can be used as a catalyst for ring-opening polymerization of cyclic lactones, has high catalytic activity, good stereoselectivity and fast reaction rate, polymerization operation is simple, the obtained polymerization product has a narrow molecular weight distribution, a controllable molecular weight and a high yield, and the asymmetric aluminum complex catalyst can be widely used for ring-opening polymerization of the cyclic lactones, and is an ideal catalyst.

The invention discloses a method for catalyzing polymerization of glycolide by using an asymmetric aluminum complex containing an o-phenylenediamine group, and the method comprises the following steps: mixing a catalyst, an organic solvent and a benzyl alcohol co-catalyst with the glycolide for ring-opening polymerization under anhydrous oxygen-free inert-gas protection conditions, and after the reaction, treating the reaction product to obtain polyglycolide; wherein the catalyst is the asymmetric aluminum complex containing the o-phenylenediamine group. The self-developed asymmetric aluminumcomplex containing the o-phenylenediamine group is used as the catalyst, the catalyst is simple in preparation method, the cost is low, the yield is high, the catalyst structure is varied, metal center aluminum is coordinated with bivalent N, N, O and O of a ligand, and the catalyst has high catalytic activity, high stereoselectivity and fast reaction rate. The obtained polymer is a benzyloxy-terminated polymer with narrow molecular weight distribution, controllable molecular weight and high yield, and can meet the needs of the market.