45 results about "Azane" patented technology

The invention discloses a high-temperature-resistant high-stripping organic silicon pressure-sensitive adhesive and a preparation method thereof, and relates to a pressure-sensitive adhesive and a preparation method thereof. The invention aims to solve the problems of insufficient temperature resistance, low peel strength and poor binding force with a base material of the existing organic silicon pressure-sensitive adhesive. According to the invention, phenyl siloxane rubber, hydroxyl-terminated polysiloxane and methyl vinyl MQ silicon resin are used as basic raw materials, and polysilazane is used as a heat-resistant modifier to carry out heat-resistant modification on the chemical structure of the pressure-sensitive adhesive; a trifunctional allyl silane monomer is added in the film preparation process, so that the crosslinking density of the system is improved, and the heat resistance of the pressure-sensitive adhesive is further improved; the bonding force between the pressure-sensitive adhesive and a polyimide substrate is improved by adding the peroxysilane coupling agent, and the use of a primer in the coating process is omitted; by adding the hydroxyl MQ silicon resin and the phosphate adhesion promoter, the bonding strength of the pressure-sensitive adhesive is improved, and the high-temperature-resistant and high-stripping organic silicon pressure-sensitive adhesive is prepared. According to the invention, the high-temperature-resistant and high-stripping organic silicon pressure-sensitive adhesive can be obtained.

The invention discloses polysilazane containing a perfluorinated branched short chain and a preparation method of the polysilazane. The method comprises the following steps: (1) under the protection of inert gas, adding chlorosilane and a perfluorinated branched short-chain compound into a solvent for reaction to obtain a fluorine-containing chlorosilane monomer; and (2) adding a fluorine-containing chlorosilane monomer and a chlorosilane monomer into a solvent, and carrying out ammonolysis reaction under the protection of inert gas to prepare the fluorine-containing polysilazane. According to the invention, a perfluorinated branched short chain is introduced into polysilazane, so that the polysilazane is endowed with the characteristic of low surface energy, and meanwhile, the problems of toxicity and biological accumulation caused by a long-chain perfluorinated chain segment are avoided.

The invention discloses fluorine-containing modified organic polysilazane as well as a preparation method and application thereof. Organic polysilazane and a fluorine-containing alcohol monomer are subjected to alcoholysis reaction to prepare the fluorine-containing modified organic polysilazane. Fluorine-containing modified organic polysilazane and the surface of a base material are combined together through chemical bonds to form a firmly combined protective film, and a fluorine-containing polysilazane coating formed by hydrolysis in air has the effects of hydrophobicity, high and low temperature resistance, scratch resistance, rain prevention, fog prevention and self-cleaning.

The invention relates to the technical field of corrosion resistance, in particular to a towel rack surface corrosion-resistant spraying process, which is characterized in that a towel rack is treated in a spraying manner, and modified graphite phase carbon nitride is introduced into a protective coating as a filler by performing component design on the coating for spraying and then performing light curing treatment; the preparation method comprises the following steps: by taking tyrosine and thiourea as precursors, preparing graphite phase carbon nitride nanosheets by a microwave method, then preparing a zinc oxide-graphite phase carbon nitride binary composite nanomaterial by a hydrothermal method, carrying out double-bond treatment on composite graphite phase carbon nitride by utilizing vinyltriethoxysilane, and then grafting long-chain alkyl modified polysilazane containing double bonds; the preparation method comprises the following steps: by taking castor oil as a raw material, synthesizing a prepolymer together with isophorone diisocyanate under the action of a catalyst, taking 3-dimethylamino-1, 2-propylene glycol as a chain extender, taking 2, 2-dimethylolpropionic acid as a hydrophilic chain extender, and taking hydroxyethyl methylacrylate and hydroxylated long-chain alkyl modified polysilazane as end-capping reagents.

A method is provided for producing a modified polysilazane-cured coating that densifies a coating made of a polysilazane compound in a short period of time. This method provides a coating having a sufficiently low water vapor transmission rate in a short period of time. Additionally, this method provides a modified polysilazane-cured coating. To cure the coating containing polysilazane, it is irradiated with vacuum ultraviolet (VUV) light at an intensity within a specific range. The method includes a step of applying a base material containing the polysilazane compound represented by formula (1) to form a coating and irradiating the coating with Xe excimer light to modify the polysilazane compound and form a cured coating of the modified polysilazane compound. The illuminance of the Xe excimer light in the curing step is set to a range of 280 to 450 mW / cm2.

The invention relates to the technical field of liquid silicone rubber, and particularly discloses a wear-resistant liquid silicone rubber composite material and a preparation method thereof. The composite material comprises a component A and a component B, wherein the component A comprises vinyl-terminated silicone oil, nano aluminum oxide double-modified by a polyhydroxy polymer and a vinyl silane coupling agent, and a platinum catalyst; the component B comprises vinyl-terminated silicone oil, hydrogen-containing silicone oil, an inhibitor and active polysilazane, the active polysilazane is modified polysilazane containing vinyl or epoxy group, and the active group of the active polysilazane can chemically react with the active group on the surface of the modified nano aluminum oxide to form a chemically bonded interface transition layer. According to the invention, through a dual modification strategy and introduction of active polysilazane, a chemically bonded rigid-flexible bicontinuous network structure is constructed, so that the wear resistance of the composite material is improved while excellent tensile strength, tear strength and elongation at break are maintained.

The application discloses spherical silicon nitride powder and a preparation method and application thereof, and belongs to the field of nitride ceramic materials. The spherical silicon nitride powder has a beta phase silicon nitride content of greater than or equal to 95%, an average sphericity of greater than or equal to 0.80, a tap density in a range of 1.9-2.2 g / cm 3 , and a particle size in a range of 10-170 mu m. The preparation method comprises the following steps: in an organic solvent, taking beta-Si3N4 as an aggregate, taking silicon nitride precursors as an activator, taking a beta-diketone rare earth complex as a sintering aid, taking a mixture of polysilazane and PVB as a binder, and after pretreatment, high-temperature calcination is carried out under a nitrogen atmosphere to obtain the spherical silicon nitride powder. The prepared spherical silicon nitride powder can be used as a raw material for preparing an insulating heat-conducting material. The application can realize the preparation of high-density and high-thermal-conductivity spherical silicon nitride powder, and the prepared insulating heat-conducting material has high thermal conductivity.

The invention discloses an alkyl substituted 1, 4-bis (2-pyridylmethyl)-1, 4-diazane coordination metal peroxide catalyst, a compound catalyst, a preparation method and application, and the general formula of the alkyl substituted 1, 4-bis (2-pyridylmethyl)-1, 4-diazane coordination metal peroxide catalyst is shown in the specification. The composite catalyst comprises an alkyl substituted 1, 4-bis (2-pyridyl methyl)-1, 4-diazane coordination metal peroxide catalyst, a cocatalyst, a regulator, a protective agent and a solvent. The alkyl-substituted 1, 4-bis (2-pyridylmethyl)-1, 4-diazane coordinated metal peroxide catalyst and the compound catalyst can improve the selectivity of the reaction for preparing fatty acid by oxidizing fatty aldehyde, increase the reaction activity, can be repeatedly used, are low in cost, have a relatively high utilization rate, and are particularly suitable for the oxidation reaction of C4-C18 fatty aldehyde.

The invention discloses a modified perovskite quantum dot and a preparation method thereof, belongs to the technical field of perovskite, and overcomes the defect that hydrolysis is difficult to promote and the perovskite quantum dot is difficult to be damaged at the same time in the prior art. The preparation method of the modified perovskite quantum dots comprises the following steps: step 1, preparing a perovskite quantum dot dispersion liquid; 2, mixing the perovskite quantum dot dispersion liquid, a silicon source and / or an aluminum source and organic silicon, and reacting to prepare modified perovskite quantum dots with a coating shell; the organic silicon is # imgabs0 # cyclosilazane or hexamethyl disilazane; the organic silicon is a mixture of the organic silicon and the organic silicon; r is H or # imgabs1; # R1-R9 are respectively and independently selected from H, alkyl, halogenated alkyl, alkenyl or phenyl. According to the method, the purposes of enhancing the hydrolysis coating compactness and protecting the perovskite quantum dots are achieved at the same time.

This invention belongs to the field of polymer materials technology and relates to a method for preparing a self-crosslinkable polysiloxane with adjustable boron content. The invention discloses a method for preparing a self-crosslinkable polysiloxane with adjustable boron content, comprising: S1, filling a reaction flask containing carborane with an inert gas, then adding a reaction solvent and dropwise n-butyllithium to the reaction flask under an ice bath environment, and proceeding with a first reaction after the addition is complete; S2, at -40 to -100°C, adding chlorosilane dropwise to the above-mentioned reaction flask filled with inert gas and containing the reaction product of step S1, and proceeding with a second reaction after the addition is complete; S3, removing the lithium salt to obtain the monomer of the polyborosilicate; S4, mixing the chlorosilane monomer of the polyborosilicate with an amine compound, adding a reaction solvent, and performing a three-stage heating reaction to obtain the polyborosilicate; S5, dissolving the polyborosilicate in a solvent and reacting it with a catalyst at 60 to 300°C for 2 to 12 hours.

Provided is a coating agent composition with which it is possible to uniformly produce a polysilazane-based inorganic film on an organic resin film without generating defects such as pinholes. This coating agent composition is characterized by containing the following (A), (B), and (C): (A) a polysilazane compound having a repeating structure represented by formula (1) (in the formula, R1 independently represents a hydrogen atom or a group selected from the group consisting of an aliphatic hydrocarbon group having 1-6 carbon atoms, an aromatic hydrocarbon group having 6-12 carbon atoms, and an alkoxy group having 1-6 carbon atoms; and n is an integer from 2 to 20,000; (B) a surfactant represented by formula (2) (in the formula, R2 independently represents a hydrogen atom or a group selected from the group consisting of an aliphatic hydrocarbon group having 1-6 carbon atoms, an omega-hydroxyalkyl group having 1-12 carbon atoms, and an omega-alkoxyalkyl group having 2-12 carbon atoms; and (C) an organic solvent.

Provided are: a method for producing a modified polysilazane cured coating film, with which it is possible to densify a film comprising a polysilazane compound in a short period of time; and a modified polysilazane cured coating film obtained by means of the method for producing the modified polysilazane cured coating film. A film having a sufficiently low water vapor transmission rate is produced in a short period of time. When curing the polysilazane compound, a coating material containing the polysilazane compound is irradiated with vacuum ultraviolet light (VUV) at an irradiation intensity within a specific range. Specifically, the method comprises: a coating step for coating a substrate with a solution containing a polysilazane compound represented by general formula (1) to form a coated article; and a curing step in which the coating material is irradiated with Xe excimer light to modify the polysilazane compound to form a cured film of the modified polysilazane compound, the illumination of the Xe excimer light in the curing step being in the range of 280-450 mW / cm2. General formula 1

The invention relates to the technical field of preparation of composite silicone rubber, in particular to polysilazane composite resin as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking branched polysilazane as a curing agent, mixing silicone oil and branched polysilazane in the presence of a catalyst, carrying out curing treatment, attacking a silicon-nitrogen bond in the branched polysilazane by a silicon hydroxyl group in the silicone oil in the curing treatment process, breaking the silicon-nitrogen bond and forming a new silicon-oxygen bond, thereby obtaining the polysilazane composite resin, the branched polysilazane with higher functional group density is used as the curing agent, the prepared polysilazane composite resin has high elongation and tensile property, and the problem of insufficient crosslinking efficiency caused by poor compatibility and low functional group density of traditional linear / cyclic polysilazane is solved, so that the rapid curing of the resin is realized.

This invention provides a click chemistry-based durable flame-retardant TPE composite material and its preparation method, belonging to the field of polymer material modification technology. The material includes: 10-60 parts of modified SBS prepared by click chemistry, 5-40 parts of filler oil, 2-15 parts of polypropylene, and 10-20 parts of silazane-modified microencapsulated flame retardant. This invention imparts flame-retardant and anti-aging properties to the matrix through click chemistry modification of SBS. Simultaneously, the silazane-modified microencapsulated flame retardant shell contains a benzene ring structure with char-forming function and flame-retardant elements such as silicon, nitrogen, and phosphorus, which work synergistically with the core flame retardant to improve the flame-retardant performance and flame-retardant rating of the material. Furthermore, the microencapsulated organic shell improves the compatibility of the flame retardant and the mechanical and durability properties of the flame-retardant TPE material. The benzene rings and phosphorus-carbon bonds in the flame retardant also enhance the heat aging resistance of the TPE, further strengthening the flame-retardant and heat-aging properties of the TPE material.

The present invention provides (A) a polysilazane compound that has structures represented by formulae (A-1), (A-2), and (A-3) and does not have a hydrosilyl group (in the formulae, each R is a group selected from among an aliphatic hydrocarbon group having 1 to 6 carbon atoms and a phenyl group, and the R groups may be the same as or different from each other in the polysilazane compound, provided that the ratio of the phenyl group to the total amount of the R groups is 0.3 or less). The polysilazane compound is characterized in that the ratio of each structural unit to the polysilazane compound satisfies all of formulae (1) to (3).　Formula (1): (A-1) + (A-2) + (A-3) = 1; formula (2): 0.2 ≤ (A-1) ≤ 0.7; and formula (3): 0 < (A-2) ≤ (A-3) × 4. Thus, provided is a material which has a high and tunable refractive index, has high heat resistance, and is capable of bonding members with sufficient strength.

The invention provides low-oxygen-content silicon nitride powder and a preparation method thereof, and belongs to the technical field of silicon nitride preparation. The preparation method comprises the following steps: by taking amine with a steric hindrance group as a raw material, synthesizing a nitrogen-loving and oxygen-phobic polysilazane precursor capable of resisting water decomposition and erosion; a precursor and a catalyst precursor are co-wrapped by PEG-PPG-PEG, so that excellent dispersity of final powder is preset, a catalyst is pre-embedded for a subsequent carbon removal step, and mild low-temperature curing is realized through supercritical ammonia; in the step-by-step pyrolysis process, the template is firstly removed to physically isolate particles, then the pre-buried catalyst is activated, and solid residual carbon is actively converted into gas to be removed; in the high-temperature crystallization stage, the rule that impurities are naturally segregated to particle surfaces is utilized, high-activity gas-phase chemical etching is assisted for surface treatment, solid oxygen impurities are converted into volatile gaseous products to be removed, and the low oxygen content of the final product is ensured.

The invention provides formyloxy polysilazane as well as a preparation method and application thereof. The formyloxy polysilazane has a structure as shown in a general formula (I), and R1, R2 and R3 are specific groups; n / (m + n) is equal to 0.1-0.7. The formyloxy polysilazane disclosed by the invention has unique molecular design, is decomposed to generate carbon dioxide during combustion, has an excellent flame-retardant effect, can be used as a macromolecular flame retardant, and does not release toxic or corrosive gas; and the nitrogen silane has a ceramic effect at a high temperature, so that the nitrogen silane can play a role in heat insulation and dripping resistance, and has a wide application prospect in the field of material flame retardance.

The invention relates to the field of macromolecules, in particular to a high-flame-retardance polycarbonate composition and a preparation method thereof. The polycarbonate composition with high flame retardance is prepared from the following components in parts by weight: 65 parts of PC, 25 to 35 parts of ABS (Acrylonitrile Butadiene Styrene), 2 to 10 parts of polysilazane, 3 to 5 parts of MBS (Methyl Methacrylate-Butadiene-Styrene) compatilizer, 0.7 part of antioxidant and 0.3 part of lubricant. The polysilazane is introduced into the polycarbonate composition, the surface temperature of the material is reduced by utilizing the endothermic effect of Si-N bond breakage, the combustible gas is diluted by nitrogen generated by decomposition, the combustion speed is slowed down by the concentration of oxygen, and a decomposition product forms a protective layer to isolate oxygen and control the transfer of heat and the combustible gas; and a carbon residue layer is generated to provide additional heat-insulating and flame-retardant effects, so that the flame-retardant property of the composition is remarkably improved.

A laminate comprising a substrate, an underlayer disposed on the substrate, and a surface-treating layer disposed on the underlayer, wherein the underlayer is a layer formed of (A) polysilazane represented by the following formula (P) or (B) aminosilane represented by the following formula (Q) and the surface-treating layer is a layer formed of a fluorine-containing silane compound:N(R71—SiR723)mR733-m  (Q).

A coating composition includes (A), (B), and (C).(A) A polysilazane compound having a repeating structure represented by formula (1):In formula, R1 independently represents a hydrogen atom or a group selected from an aliphatic hydrocarbon group having 1 to 6 carbon atoms, an aromatic hydrocarbon group having 6 to 12 carbon atoms, and an alkoxy group having 1 to 6 carbon atoms. “n” represents an integer of 2 to 20,000. (B) A surfactant represented by formula (2):In formula, R2 independently represents a hydrogen atom or a group selected from an aliphatic hydrocarbon group having 1 to 6 carbon atoms, an ω-hydroxyalkyl group having 1 to 12 carbon atoms, and an ω-alkoxyalkyl group having 2 to 12 carbon atoms.(C) An organic solvent. This can provide a coating composition that can uniformly form an inorganic film with a polysilazane on an organic resin film without defects such as pinholes.

The invention discloses a preparation method of an aluminum-containing high-temperature-resistant coating, which comprises a component A and a component B. The component A is prepared by mixing methyl phenyl organic silicon resin, an organic solvent, a flexibilizer, a leveling agent, an anti-settling agent, double-layer coated aluminum powder, modified carbon nanotubes and the like, and the component B is prepared by mixing the methyl phenyl organic silicon resin, the organic solvent, the flexibilizer, the leveling agent, the anti-settling agent, the double-layer coated aluminum powder, the modified carbon nanotubes and the like. And the component B is prepared by mixing polysilazane and 1-hydroxyethyl-3-methylimidazolium p-toluenesulfonate, and the component B is prepared by mixing the components. The obtained coating is low in curing temperature and has excellent corrosion resistance and high temperature resistance.

To provide a fibrous substrate that achieves significantly improved water resistance with no change in tactile feel, and maintains sufficient strength even when wet with water.SOLUTION: The present invention provides a waterproofed fibrous substrate that has been waterproofed with a treatment agent containing a silazane compound, wherein the ratio (s2 / s1) of the vertical compressive strength (s2) after 3-hour water immersion to the vertical compressive strength (s1) before immersion, as measured by the method described in JIS Z0403-2:1999 (Method A), is 0.15 or more.SELECTED DRAWING: None

The application provides a preparation method of hydrophobic and oleophobic polyorganosilsesquioxane spherical microparticles. A binary catalytic system of a ruthenium complex with a tertiary phosphorus coordination group and an alkaline compound is used to hydrolyze polyorganosilsesquioxane molecular chains on the surface of polyorganosilsesquioxane spherical microparticles, to construct a rough micro-nano structure similar to chemical etching on the surface, and to convert part of the silicon-oxygen bonds on the surface into silicon hydroxyl groups. Then, a perfluoroalkylsilazane solution is added, and the perfluoroalkylsilazane reacts with the silicon hydroxyl groups, so that fluorine-containing alkylsiloxane is grafted to the surface of the polyorganosilsesquioxane particles to obtain modified polyorganosilsesquioxane spherical microparticles, which have superhydrophobicity and superoleophobicity, are insoluble in organic solvents, and have self-cleaning properties for hydrophilic and oleophilic pollutants.

This invention discloses a fluorinated modified organopolysilazane, its preparation method, and its applications. The fluorinated modified organopolysilazane is prepared by alcoholysis reaction of the organopolysilazane and a fluorinated alcohol monomer. The fluorinated modified organopolysilazane is chemically bonded to the substrate surface to form a firmly bonded protective film. The fluorinated polysilazane coating formed by hydrolysis in air exhibits hydrophobicity, resistance to high and low temperatures, scratch resistance, rainproofing, anti-fogging, and self-cleaning properties.

This invention discloses a polysilazane-functionalized vegetable oil-based anti-adhesion coating, its preparation method, and its application, belonging to the field of polymer coating technology. A method for preparing the anti-adhesion coating involves obtaining the polyhydroxy vegetable oil through a thiol-double bond addition reaction; mixing the polyhydroxy vegetable oil, polysilazane, and a curing agent to obtain the anti-adhesion coating; and curing the anti-adhesion coating to obtain the coating. This invention utilizes the interaction between the hydroxyl groups on the polyhydroxy vegetable oil, the -Si-OH generated after hydrolysis of the polysilazane, and the -NCO or -NCH2OH / -NCH2OR on the curing agent in the coating matrix to form a polymer coating with high crosslinking density. Furthermore, the use of polysilazane reduces the surface free energy of the coating. The anti-adhesion coating of this invention has a water contact angle ≥105.9°, a hexadecane contact angle ≥35.8°, and a surface free energy ≤22.98 mJ / m². 2 The coating surface has a bacterial anti-adhesion rate of over 90.6%, and features high transparency, high hardness, excellent adhesion, anti-adhesion performance, anti-oil pen ink performance, and self-cleaning performance.

This invention provides a hydrophobic and anti-corrosion composite material, its preparation method, and its application, relating to the field of coating materials technology. The hydrophobic and anti-corrosion composite material, by weight, comprises or is prepared from raw materials comprising the following components: polyphenylene sulfide resin: 68-90 parts; polysilazane-modified fluorinated graphene composite filler: 10-30 parts; compatibilizer: 2-4 parts; antioxidant: 0.1-0.5 parts; lubricant: 0.5-1.5 parts; optionally, corrosion inhibitor: 0.5-5 parts; wherein the raw materials for the polysilazane-modified fluorinated graphene composite filler include fluorinated graphene and polysilazane, with a weight ratio of fluorinated graphene to polysilazane of 1:(1-1.8). In the hydrophobic and anti-corrosion composite material provided by this invention, polysilazane chemically bonds with the PPS matrix and compatibilizer, and the polysilazane coating layer effectively inhibits the aggregation of fluorinated graphene sheets, achieving a synergistic unity of strength, toughness, and adhesion.

This invention relates to a tough and transparent coating capable of withstanding extreme environments, its preparation method, and its applications, belonging to the field of functional material preparation technology. The coating primarily consists of trapezoidal polysilsesquioxanes forming a continuous, dense inorganic network structure. By controlling the hydrolysis and condensation reactions of polysilazanes and aminosilanes in a solution system, a continuous network with trapezoidal polysilsesquioxanes as the main connecting units is constructed in situ, effectively suppressing disordered cross-linking during the hydrolysis-condensation process. This preparation method features mild process conditions and simple operation, suitable for large-area preparation of micron- or submicron-sized transparent coatings using solution methods. The resulting coating maintains high optical transparency while also possessing high surface hardness, good flexibility, and stable adhesion properties. It also maintains stable performance under extreme environmental conditions such as high and low temperature cycling, irradiation, and atomic oxygen, making it suitable for applications in aerospace components, flexible displays, or optical devices.

The invention belongs to the technical field of coating preparation, and provides a polysilazane-based aerospace bearing wear-resistant coating and a preparation method thereof. Silicon carbide is subjected to surface hydroxylation and silane coupling agent modification, and is compounded with a zirconium-based metal organic framework; meanwhile, graphite phase carbon nitride and calcium fluoride are compounded to prepare a composite material to form bottom layer slurry; the preparation method comprises the following steps: modifying the surface of MoS2 through ascorbic acid to form a compound, mixing g-C3N4 and CaF2, and dispersing in a polysilazane solution to form intermediate layer slurry; preparing surface layer slurry from a MoS2 compound which is the same as that of the middle layer and g-C3N4atCaF2; through the multi-layer design of the bottom layer, the middle layer and the surface layer, the high hardness and thermal stability of SiC, the porous structure of MOF and the low friction performance of MoS2 are fully utilized, polysilazane serves as a base material and has a synergistic effect with all functional materials, and excellent wear resistance and lubricity are provided.

Provided is a curable silicone composition and uses thereof. The composition has hot-melt properties, strongly adheres to poorly adhesive substrates, and is particularly superior in flexibility and toughness at high temperatures from room temperature to approximately 150° C. in cured products such as overmolding, in addition to providing a cured product that does not easily warp or become damaged even when integrally molded with a lead frame or the like. The composition comprises: (A) organopolysiloxane resin microparticles where 20 mol % or more of all siloxane units is siloxane units represented by RSiO3 / 2 where R is a monovalent hydrocarbon group; (B) a silatrane derivative or a carbasilatrane derivative; (C) a curing agent; and (D) a functional inorganic filler. The content of component (D) is 50% or more by volume relative to the overall composition. The composition is solid at 25° C. and has hot-melt properties at a temperature of 200° C. or lower.

The invention provides a high-barrier PET (polyethylene terephthalate) copolyester, a preparation method of the high-barrier PET copolyester and application of the high-barrier PET copolyester in preparation of a high-barrier polyester container, and relates to the technical field of high polymer materials, the high-barrier PET copolyester is prepared from the following raw materials: at least one of cyclic dihydric alcohol and cyclic dicarboxylic acid compounds, and a phthalic acid compound, ethylene glycol, a blocking agent and a catalyst. The blocking agent comprises a nano gamma-AlOOH master batch with PET as a base material, and optionally, the nano gamma-AlOOH is subjected to surface modification through an organic silazane compound. The high-barrier PET copolyester provided by the invention has good barrier property, temperature resistance, transparency and color value.