358 results about "Binary acid" patented technology

The invention relates to polyurethane resin, synthetic leather and a preparation method and application thereof, and relates to the technical field of polyurethane, the polyurethane resin is prepared from the following raw materials: bio-based polyester polyol, polyolefin polyol, isocyanate, a chain extender, a pore-forming agent and a solvent; the bio-based polyester polyol is prepared from the following raw materials: bio-based dihydric alcohol, bio-based dibasic acid and micromolecular branched chain-containing dihydric alcohol. The polyurethane resin provided by the invention is high in bio-based content, micromolecular branched chain-containing dihydric alcohol is introduced into bio-based polyester polyol, a branched chain structure provides scratch resistance for the synthetic leather taking the polyurethane resin as a coating layer, the crystallinity of the polyurethane resin is reduced by compounding the polyolefin polyol, the synthetic leather is endowed with soft hand feeling, and the synthetic leather has the advantages that the synthetic leather is not prone to being scratched, and the service life of the synthetic leather is prolonged. Due to the addition of the chain extender and the pore-forming agent, the polyurethane has excellent foaming performance, the synthetic leather has excellent water absorption, and the hand feeling of the synthetic leather is further improved.

The invention provides a preparation method of a nylon elastomer with good dyeing property, antibacterial property and antistatic property. The preparation method comprises the following steps: S1, preparing a dicarboxyl-terminated nylon hard segment from binary acid, diamine or lactam and an end-capping reagent; s2, reacting the dicarboxyl-terminated nylon hard segment with polyether polyol to generate a dicarboxyl-terminated nylon elastomer with a certain molecular weight; s3, reacting the double-carboxyl-terminated nylon elastomer with the double-amino-terminated aminoguanidine compound to generate a double-amino-terminated nylon elastomer with a guanidyl group; and S4, dipping the double-amino-terminated nylon elastomer with the guanidyl group by using an anionic antistatic agent solution. The novel nylon elastomer prepared by the invention has higher molecular weight, the dyeing property of the novel nylon elastomer is favorably improved by diamino-terminated end, guanidyl is introduced in a copolymerization manner, so that the novel nylon elastomer has good antibacterial property, and meanwhile, the guanidyl is combined with the anionic antistatic agent through an ionic bond, so that the nylon elastomer has firmer antistatic property.

The invention relates to the technical field of material preparation, and discloses a polyamide elastomer and a preparation method and application thereof, and the preparation method of the polyamide elastomer comprises the following steps: mixing raw materials, and carrying out amidation reaction to obtain an amide compound; then adding a catalyst B, and carrying out polyesterification reaction to obtain a polyamide elastomer; the raw materials comprise binary acid, diamine, polyether glycol, a catalyst A and water, the reaction temperature of the amidation reaction is 150-180 DEG C, and the addition amount of the water is 20-40% of the total mass of the binary acid, the diamine and the polyether glycol. The polyamide elastomer which is relatively regular in structure and excellent in comprehensive performance can be prepared, the reaction efficiency can be effectively improved, and the preparation method is suitable for industrial large-scale production.

The invention belongs to the technical field of high polymer materials, and particularly discloses a halogen-free flame retardant DOPO-NH2 and a preparation method of halogen-free flame-retardant polyamide of the halogen-free flame retardant DOPO-NH2. The halogen-free flame retardant DOPO-NH2 is prepared by taking DOPO and 1, 4-butanediol as raw materials, and carrying out nitration and hydrogenation reduction reaction. The flame retardant DOPO-NH2 is mixed with binary acid and water to prepare a flame retardant organic salt solution, and then the flame retardant organic salt solution is subjected to polymerization reaction with a polyamide salt solution formed by a salt forming reaction of diamine and binary acid to prepare the halogen-free flame-retardant polyamide resin. The halogen-free flame-retardant polyamide prepared by the invention is excellent in flame retardant property, and can obtain a good flame retardant effect under different addition amounts; the limit oxygen index is basically more than 33%, the vertical combustion test reaches the UL94V-0 level, and the flame-free flame retardant is self-extinguished in the combustion test, and no molten drop is generated; the preparation method and process are simple, mild in condition and easy to operate.

The invention provides copolymerized flame-retardant nylon containing nitrogen and phosphorus as well as a preparation method and application of the copolymerized flame-retardant nylon. The copolymerized flame-retardant nylon containing nitrogen and phosphorus is formed by copolymerizing a structural unit I and lactam or copolymerizing the structural unit I, diamine and binary acid, the nitrogen and phosphorus-containing copolymerized flame-retardant nylon belongs to a halogen-free flame-retardant environment-friendly high polymer material and is intrinsic flame-retardant nylon, so that the problems of flame retardant migration, compatibility with a base material and the like do not exist, excellent flame-retardant performance can be achieved under the condition of relatively low introduction amount of a flame-retardant structural unit, and meanwhile, excellent mechanical property and spinnability can be kept.

The invention provides a thermoplastic polyester elastomer as well as a preparation method and application thereof. The thermoplastic polyester elastomer comprises aromatic dibasic acid residues and aliphatic polyol residues, on the basis that the total molar weight of the aliphatic polyol residues is 100 mol%, the aliphatic polyol residues comprise 66 to 95 mol% of micromolecular diol residues, 2 to 24 mol% of polymer polyol residues and 1.5 to 10 mol% of third polyol residues; the third polyhydric alcohol residues comprise residues derived from a benzotriazole compound and residues derived from a tetramethyl piperidine compound. The thermoplastic polyester elastomer is good in light aging resistance, the surface of a workpiece is not separated out in the processing process and after the thermoplastic polyester elastomer is placed for a long time, and the requirement of automobile interiors for color change of light-color materials after light aging is met.

The invention relates to the technical field of multi-layer copolyester films, and discloses a high-temperature-resistant antistatic multi-layer copolyester film and a preparation method and application thereof, and the multi-layer copolyester film comprises an ABA three-layer structure obtained through melt co-extrusion; the layer A is prepared from the following raw materials in percentage by mass: 5 to 30 percent of anti-blocking agent master batch and the balance of modified copolyester; the raw material of the layer B is modified copolyester; the modified copolyester is prepared from a binary acid mixture, a dihydric alcohol mixture and a catalyst through an esterification reaction and a condensation polymerization reaction; the binary acid mixture comprises furandicarboxylic acid and 2, 2 '-bifuran-5, 5'-dicarboxylic acid, and the dihydric alcohol mixture comprises ethylene glycol, 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol and 1, 4-cyclohexanedimethanol. According to the invention, the modified copolyester is used as a main raw material, and the film is endowed with good temperature resistance in a copolymerization modification manner, and has stable and lasting antistatic performance.

The present invention provides a polyester hot melt adhesive and a preparation method and application thereof. The polyester hot melt adhesive comprises 50-60 parts of a first polyester resin, 10-20 parts of a second polyester resin and 20-30 parts of a third polyester resin in parts by weight; the raw materials for preparing the first polyester resin include aromatic dibasic acid, diol and polyamine; the raw materials for preparing the second polyester resin include aliphatic dibasic acid and aliphatic long-chain diol; the raw materials for preparing the third polyester resin include dibasic acid, diol and polypropylene grafted maleic anhydride. In the present invention, the polyester hot melt adhesive is compounded by three polyester resins with specific structures, so that the polyester hot melt adhesive has both excellent high temperature resistance and low temperature resistance, can be used for a long time under high and low temperature conditions, will not have debonding, film shrinkage, edge warping and other phenomena, has good high and low temperature cycle resistance, and has low construction viscosity, good adhesion to a variety of substrates, high adhesion, and a wide range of applications.

The invention belongs to the technical field of polyurethane resin, and provides polyurethane resin, polyurethane synthetic leather and a preparation method and application thereof. The preparation raw materials of the polyurethane resin comprise the following components in percentage by mass: 11%-18% of modified polyol, 3%-9% of bio-based polyol A, 0.01%-0.02% of an antioxidant, 0.001%-0.003% of a catalyst, 5%-7% of isocyanate, 0.5%-3% of a chain extender, 0.1%-0.4% of a terminator, 0.02%-0.04% of an anti-visbreaking aid, 0.5%-3% of a polyether aid and 68%-73% of a solvent, wherein the preparation raw materials of the modified polyol comprise bio-based polyol, alcohol amine and binary acid; the bio-based polyol A comprises bio-based polypropylene carbonate dihydric alcohol. The polyurethane synthetic leather prepared by the preparation method disclosed by the invention has good slip resistance, excellent perspiration-resistant color fastness and relatively high blackness, and is suitable for yoga mats.

The invention discloses an anti-aging poly (butylene terephthalate)-sebacate copolymer and a preparation method thereof, and belongs to the technical field of high polymer materials, the anti-aging poly (butylene terephthalate)-sebacate copolymer comprises the following preparation raw materials: binary acid, dihydric alcohol, a cross-linking agent, a catalyst, a stabilizer, an anti-hydrolysis agent and an antioxidant; by adding the cross-linking agent, the catalyst, the stabilizer, the anti-hydrolysis agent and the antioxidant, the damp-heat aging resistance stability of the PBSeT resin is remarkably improved, the shelf life of a PBSeT product is prolonged, and meanwhile, the PBSeT resin has a certain bio-based content, so that the PBSeT resin can be used as a high-temperature-resistant material for the high-temperature-resistant high-temperature-resistant material for the high-temperature-resistant high-temperature-resistant high-temperature-resistant material. The requirements of some fields on the bio-based content can be met, the problem that the PBAT resin does not contain the bio-based can be solved, and the PBAT resin has a wide application prospect.

The invention belongs to the technical field of copolymerization modification of degradable polyester, and discloses a preparation method of tertiary amine modified rapidly degradable polyester, which comprises the following steps: in the presence of a catalyst and an auxiliary agent, carrying out esterification, pre-polycondensation and polycondensation on tertiary amine, dibasic acid and dihydric alcohol to prepare the tertiary amine modified rapidly degradable polyester, the structural formula of the tertiary amine is RN (CH2CH2OH) 2, R is a side group, and the side group at least contains one hydroxyl group. The preparation method is simple and easy to implement, the prepared tertiary amine modified rapidly degradable polyester can be hydrolyzed, the mass loss within 49 days can reach 3-20%, especially hydrolysis can be further accelerated after oxidation treatment, and meanwhile the breaking strength of copolyester is enhanced.

A high-reliability fast-curing UV adhesive for outer layer protection of a power battery, a preparation method therefor, and a use thereof. The UV adhesive contains an acrylate oligomer, a monofunctional acrylate monomer, a bifunctional acrylate monomer, a trifunctional acrylate monomer, an acrylate monomer containing an acidic functional group, a photoinitiator, and an optional additive, wherein the acrylate oligomer simultaneously contains dibasic acid-modified bisphenol A epoxy acrylate, tetrafunctional branched polyester acrylate, and polyurethane acrylate with polyester diol as a backbone. The resulting UV adhesive has a high curing rate, can be cured by means of an LED, is suitable for a high-precision ink-jet process, meets reliability requirements, such as insulation, voltage resistance, boiling resistance in water, and salt spray resistance, and bonding strength requirements, can replace a PET blue film as an insulating protective layer for outer layer packaging of a power battery, and leaves room for lightweight battery design.

The invention discloses a sulfonate grafted polyether-polyester-polyamide block copolymer and a synthesis method thereof, and belongs to the field of materials. The invention provides a block copolymer elastomer material taking polycaprolactam as a hard segment and polyether and polyester as soft segments, and specific sulfonic acid groups are introduced to meet specific applications. According to the invention, caprolactam, 6-aminocaproic acid, aliphatic dibasic acid, aliphatic diamine, polyether glycol, sulfonate grafted polyester polyol BY-3305 and the like are used as raw materials, and macromolecular sulfonate grafted polyester polyol BY-3305 is used as a sulfonate grafting agent, so that the reaction efficiency is higher than that of a small molecular monomer containing a sulfonic acid group, and fewer reaction byproducts are generated; the polymerization reaction can be smoothly carried out. The sulfonate grafted polyether-polyester-polyamide block copolymer elastomer is obtained through one-step melt polymerization, and has the advantages of being simple and convenient in synthesis method, low in production cost, high in strength, adjustable in performance and the like.

The invention discloses an isosorbide-based heat-resistant yellowing-resistant biodegradable polyester and a preparation method thereof.The preparation method comprises the following steps that under the condition of an esterification catalyst, dibasic acid and dihydric alcohol are subjected to an esterification reaction, the dibasic acid is composed of terephthalic acid and 1, 1-cyclohexanedicarboxylic acid, and the dihydric alcohol is composed of 1, 1-cyclohexanedicarboxylic acid; the dihydric alcohol is composed of isosorbide and aliphatic dihydric alcohol; after the esterification reaction is finished, adding a polycondensation catalyst, a stabilizer and a toner into an esterification reaction product to carry out polycondensation reaction; after the polycondensation reaction is finished, the polycondensation product is subjected to bracing and grain-sized dicing, and the isosorbide-based heat-resistant and yellowing-resistant biodegradable polyester is obtained. 1, 1-cyclohexanedicarboxylic acid is introduced to replace part of terephthalic acid, aromatic ring structures on polyester chains are reduced, the yellowing resistance of polyester is improved, meanwhile, biomass-sourced isosorbide is added as a heat-resistant modified component, and the isosorbide-based heat-resistant and yellowing-resistant biodegradable polyester is obtained through a direct esterification method.

The invention relates to a high-toughness low-melting-point nylon resin and a preparation method and application thereof, the high-toughness low-melting-point nylon resin is mainly prepared from the following components: long carbon chain binary acid, long carbon chain diamine, ether bond-containing amino acid, a catalyst and an end-capping reagent, and water is used as a reaction medium. The preparation method comprises the following steps: (1) adding long-carbon-chain dibasic acid, long-carbon-chain diamine and water into a reaction kettle, and stirring at room temperature to form salt; and (2) adding amino acid containing ether bonds, a catalyst and an end-capping reagent, replacing air in the reaction kettle with inert gas, introducing the inert gas, carrying out condensation polymerization reaction, introducing the inert gas, and discharging to obtain the product. The high-toughness low-melting-point nylon resin is applied to the technical field of automobile oil pipes, water pipes or energy storage equipment hoses. The high-toughness low-melting-point nylon resin is high in toughness, low in melting point, low in water absorption rate, diversified in product and easy to process. The product obtained by the method is few in by-products, simple in production process and suitable for industrial continuous production.

The invention relates to the field of polyester fiber production, and discloses modified copolyester, a preparation method thereof and a polyester fiber product. The modified copolyester contains a structural unit A as shown in a formula (I), a structural unit B as shown in a formula (II) and a structural unit C as shown in a formula (III), wherein R1, R2, R3 and R4 are each independently a C1-C10 alkyl group, and m is a positive integer greater than 3; rI, RII, and RIII are each independently hydrogen or a C1-C10 alkyl group. The preparation method comprises the following step: in the presence of a catalyst, carrying out contact reaction on a binary acid monomer, a dihydric alcohol monomer, a component a with a structure as shown in a formula (I), a component b with a structure as shown in a formula (II) and a component c with a structure as shown in a formula (III). The modified copolyester fiber material has good softness and crease resistance, the wearability of a polyester fiber product can be effectively improved, and the diversity and functionality of the polyester material are improved. # imgabs0 #

The invention discloses a halogen-free bio-based flame-retardant polyester polyol, which is prepared by mixing sec with monobasic acid and binary acid, the polyester polyol with moderate crosslinking degree can be prepared by using the cyclic structure of sec and the trifunctional hydroxyl structure of sec, and the prepared flame-retardant polyester polyol has excellent performance in a V-0 grade flame-retardant test. The dependence on a toxic flame retardant is also reduced; in addition, the cyclic structure and high nitrogen content of sec-cyan help to form a more compact cross-linked network after the material is formed, the material is endowed with better tensile strength and heat resistance, and mechanical properties and flame retardant effect are both considered. Wherein part of trimethylolpropane can be used for replacing siroc, so that the cost and the performance are both considered. The invention also provides application of the halogen-free bio-based flame-retardant polyester polyol. The halogen-free bio-based flame-retardant polyester polyol and isocyanate are mixed to prepare a polyurethane material.

The invention discloses a mechanically-enhanced creep-resistant polyester fiber and a preparation method thereof, and relates to the technical field of polyester modification. The preparation method comprises the following steps: 1, carrying out molar proportioning on terephthalic acid and a furan unit to obtain a first composition, taking 2, 5-furandicarboxylic acid or dimethyl furan-2, 5-dicarboxylate as the furan unit, and carrying out molar proportioning on binary acid and dihydric alcohol to obtain a second composition; and 2, uniformly mixing the first composition, the second composition and a titanium / antimony composite catalyst, and carrying out esterification and polycondensation to obtain the modified copolyester. A small number of furan ring reaction sites similar to a benzene ring structure are formed in a polyester preparation stage, so that the spinnability of original polyester is not influenced, and the quality of a melt subjected to multiple times of melting processing is not reduced due to reactive blending. In addition, through in-situ polymerization, furan rings can be dispersed in molecular chains more disorderly, the problem of additional dispersion caused by blending is avoided, and beneficial effects are provided for preparing homogeneous creep-resistant fibers.

The invention belongs to the technical field of high polymer materials, and particularly discloses a preparation method of a bio-based nylon 56-X copolymer. Replacing the first salt forming kettle and the second salt forming kettle with nitrogen, and maintaining micro-positive pressure in the two salt forming kettles; putting desalted water, diamine and binary acid into a first salt forming kettle for salt forming reaction to obtain a nylon salt solution; adding the obtained nylon salt solution into a second salt forming kettle, and adding a second type of diamine or binary acid for salt forming reaction to obtain a mixed salt solution; filtering the obtained mixed salt solution to remove trace solid impurities, and feeding into a salt storage tank; finally, the mixed salt solution in the salt storage tank is conveyed into a polymerization kettle to be subjected to polymerization reaction, and the bio-based nylon 56-X copolymer is obtained. According to the preparation method, the stability and high efficiency of the copolymerization reaction are ensured by accurately controlling the reaction conditions, particularly by accurately adjusting the pH value and concentration of the mixed salt solution, so that the nylon 56-X copolymer with uniform performance and excellent comprehensive performance is obtained.

The invention relates to the field of 3D printing, and particularly discloses high-toughness and high-tack polyester for 3D printing and a preparation method thereof.The polyester is prepared from, by mass, 0.2-3% of antioxidant, 0.1-3% of dispersing agent and the balance matrix resin; the matrix resin comprises the following raw materials: binary acid, dihydric alcohol, a graft polymer, a catalyst and a protective agent. According to the polyester, a graft polymer containing active groups such as hydroxyl is introduced into matrix resin, so that the melt uniformity of a whole blending system is improved, the interface energy is reduced, a polyester molecular chain is easier to cross an interlayer interface to move and entangle, stronger physical connection is formed, layers are easier to bond and do not crack during 3D printing, and the 3D printing performance is improved. The adhesive has excellent interlayer adhesive force, meets the application requirement of high additional value in the field of industrial-grade 3D printing, and can be used in the fields of outdoor artware, construction industry, aerospace, medical instruments and the like.

The invention relates to acrylate modified polyester resin as well as a preparation method and application thereof. The method comprises the following steps: (1) performing esterification reaction on anhydride with polyfunctional groups and long-chain unsaturated monofunctional alcohol to obtain an unsaturated intermediate; (2) carrying out esterification reaction on the unsaturated intermediate obtained in the step (1), dibasic acid and dihydric alcohol, and then carrying out polycondensation reaction to obtain a polyester resin intermediate containing unsaturated double bonds; and (3) carrying out free radical polymerization reaction on the polyester resin intermediate containing the unsaturated double bond obtained in the step (2) and an acrylate monomer to obtain the acrylate modified polyester resin. The acrylate modified polyester resin obtained by the method provided by the invention has excellent non-polar base material bonding performance.

The invention belongs to the technical field of unsaturated polyester resin materials, and particularly relates to an unsaturated polyester resin material containing a potassium bromide composite accelerant and a preparation method of the unsaturated polyester resin material. The unsaturated polyester resin material containing the potassium bromide composite accelerant comprises the following raw materials: unsaturated polyester resin, the composite accelerant and an initiator, the unsaturated polyester resin is prepared from the following raw materials: dihydric alcohol, saturated dibasic acid, unsaturated dibasic acid, a polymerization inhibitor, an antioxidant and styrene. According to the unsaturated polyester resin material containing the potassium bromide composite accelerator, the composite accelerator is adopted to catalyze isomerization crosslinking of the unsaturated polyester resin, so that the curing speed of the unsaturated polyester resin is increased, the production efficiency is ensured, and the production cost is reduced; the bending strength and the bending modulus of the product prepared by adopting the composite accelerant are improved, and the impact resistance of the product is enhanced; the invention further provides a preparation method, and the preparation process is simple.

The invention belongs to the technical field of high polymer material preparation, and provides a low-melting-point toughened copolyester chip and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing hyperbranched polyester of which the surface is rich in carboxyl-terminated functional groups through core growth of polybasic acid alcohol and end group functionalization reaction of anhydride; the other chain extender is a linear chain extender which has a long flexible chain segment and two tail ends of which are also functionalized by carboxyl groups, and is obtained by carrying out end group esterification reaction on polyether glycol; then, in the synthesis process of the main polyester, carrying out multi-stage melt polycondensation on an aromatic dibasic acid component and a polyol component under the action of a composite catalyst system, introducing the hyperbranched polyester and a chain extender into a reaction system in the form of slurry, and covalently bonding a functional additive to a copolyester main chain through a polycondensation process, so as to obtain the hyperbranched polyester. An integrated network reinforced structure is formed, so that the copolyester chip has the characteristics of low melting point and excellent toughness.

The present invention relates to the technical field of polyester resins, and discloses a preparation method and application of a super-weather-resistant HAA-cured matte polyester resin. The present invention reacts neopentyl glycol, triazine phenylimide diol monomer, dibasic acid, esterification catalyst, onium salt curing accelerator, etc. to obtain a super-weather-resistant HAA-cured matte polyester resin. The triazine phenylimide diol monomer has a phenylimide ring and a triazine ring structure with heat resistance and structural stability, which is beneficial to improving the high temperature resistance and mechanical strength of the polyester resin powder coating film, showing higher impact resistance, and contains a dialkyl side chain. After being introduced into the polyester molecular chain, steric hindrance and shielding effects can be generated, inhibiting the contact between water molecules and ester bonds in the polyester molecular chain, reducing the hydrolysis reaction of the ester group, thereby improving the hydrolysis resistance of the polyester resin. And the anti-ultraviolet aging performance of the paint film is improved, and the weather resistance and light retention rate are high.

The invention provides a method for preparing electrolyte-based homo-polyester based on a waste electrolyte, and belongs to the field of polymer synthesis and high-value utilization of resources, a high-boiling-point organic solvent in the waste lithium battery electrolyte and straight-chain dihydric alcohol are subjected to transesterification under the action of a catalyst to be converted into straight-chain carbonate dihydric alcohol ester; then, the straight-chain carbonic acid diol ester is used as a rigid monomer to be copolymerized with bio-based dibasic acid, and a high-performance homopolyester material with high thermal stability, excellent mechanical property and good biodegradability is prepared; the method not only solves the problem of innocent treatment of the waste electrolyte, but also realizes effective reutilization of resources, reduces the production cost of the polyester, and remarkably improves the comprehensive performance of the polyester; in addition, compared with traditional petroleum-based polyester, the novel material provided by the invention has better environmental protection characteristic, reduces dependence on non-renewable resources, and promotes green circulation and sustainable development.

The invention discloses a flue gas desulfurization composite synergist and a preparation method thereof, and relates to the technical field of flue gas desulfurization. The desulfurization composite synergist is prepared from the following raw materials in parts by weight: 5 to 10 parts of citric acid, 20 to 30 parts of binary acid, 15 to 20 parts of sodium formate, 15 to 20 parts of sodium salt, 12 to 18 parts of magnesium salt, 2 to 4 parts of surfactant, 2 to 4 parts of pH buffering agent and 5 to 10 parts of calcium oxide. The preparation method comprises the following steps: carrying out a ring-opening reaction on 3-(2-aminoethylamine) propyl methyl dimethoxy silane and glucolactone to obtain an intermediate 1, and then carrying out a two-step quaternization reaction to synthesize the novel surfactant. The prepared desulfurization composite synergist has a good desulfurization effect and is suitable for limestone-gypsum wet flue gas desulfurization.

The invention discloses transparent copolyester, a preparation method thereof and a product prepared from the copolyester. The preparation method comprises the following steps: carrying out esterification or ester exchange reaction on dibasic acid or dimethyl ester of the dibasic acid and dihydric alcohol at 5-300kPaG to obtain an esterified substance or an ester exchange substance; then, the normal pressure of the system is recovered, the esterification or ester exchange temperature is kept unchanged, the negative pressure of the ester or ester exchange material is gradually reduced to high vacuum according to a certain pressure reduction rate, excessive monomers are removed, the content of impurities generated by the ester or ester exchange material is 0.3 wt% or below, and a prepolymer is obtained; and further heating the prepolymer, and carrying out final polycondensation reaction under high vacuum to obtain the target copolyester. The method can effectively weaken the side reaction in the synthesis process, improve the hue of the copolyester product, improve the light transmittance, reduce the haze and improve the heat resistance. Products prepared from the copolyester, such as bottle materials, sheets, plates and membrane materials, have the characteristics of light color, high transparency and good heat resistance.

The invention provides high-wear-resistance and low-atomization amphiphilic polyester polyol as well as a preparation method and application thereof. The high-wear-resistance and low-atomization amphiphilic polyester polyol is prepared from the following raw materials in parts by mole: 100 parts of binary acid / binary anhydride, 60-400 parts of polyol and 3-50 parts of sulfonate-containing alicyclic polyol through esterification and condensation polymerization. The prepared polyester polyol contains sulfonate and an alicyclic ring structure, waterborne polyurethane can be prepared without a waterborne chain extender, and the prepared waterborne polyurethane material has excellent wear resistance and low atomization characteristic, can be applied to industries such as automobile leather and leather finishing agents, and meets the requirements of low VOC and low atomization.

The invention relates to the field of polyester, and discloses a halogen-free antimony-free flame-retardant polyester preparation method, which comprises: 1) grinding a magnesium compound catalytic promoter, and crushing under liquid nitrogen cooling; then dispersing a catalytic promoter in ethylene glycol to obtain a catalytic promoter dispersion liquid; 2) mixing and esterifying dibasic acid, dihydric alcohol and a flame retardant dihydric alcohol esterifying liquid; 3) after esterification is finished, adding a titanium catalyst and a catalytic promoter dispersion liquid; and carrying out preshrinking and final shrinkage reactions to obtain the halogen-free antimony-free flame-retardant polyester. According to the invention, a titanium catalyst is compounded with a magnesium compound to serve as a catalytic promoter, so that the problem of yellowing of polyester caused by the titanium catalyst can be solved on the premise of realizing antimony-free environmental protection; and meanwhile, the magnesium compound catalytic promoter can also form a magnesium oxide layer and water vapor when the polyester is combusted, so that heat transfer can be reduced, the oxygen concentration can be diluted, and molten drops generated when the polyester is combusted can be reduced.

The invention provides bio-based hyperbranched unsaturated polyester, a UV curing coating and application of the bio-based hyperbranched unsaturated polyester and the UV curing coating. The bio-based hyperbranched unsaturated polyester is obtained through polycondensation of preparation raw materials including bio-based hydroxyl-terminated hyperbranched polyester, unsaturated binary acid and / or anhydride thereof and maleic acid modified polyolefin. The preparation raw materials of the UV curing coating comprise the following components in parts by weight: 20-60 parts of bio-based hyperbranched unsaturated polyester, 20-80 parts of an active diluent monomer and 2-7 parts of a photoinitiator. The hyperbranched unsaturated polyester disclosed by the invention is high in reaction activity, low in viscosity and low in shrinkage rate; the UV coating prepared from the resin is low in viscosity and can be coated in a roller coating mode, a cured coating is compact, MEK wiping resistance reaches more than 1000 times, glossiness attenuation is lower than 10% after UVB illumination is adopted for 1600 h, haze is lower than 1%, hardness and abrasion resistance are excellent, adhesive force to multiple base materials is good, and the UV coating is very suitable for being applied to optical films.