761 results about "Copolyester" patented technology

Disclosed are methods for enhancing recycled polymer materials for use in manufacturing film / sheet products involves obtaining a polymer starting material for recycling, heating it through melt compounding and / or extrusion processes, and incorporating modifiers such as ethylene / acrylate copolymer, ethylene / acrylate / glycidyl methacrylate terpolymer, and ethylene / glycidyl methacrylate copolymer before extrusion. The resulting modified recycled material can substitute for PVC or other virgin polymers in producing extruded film / sheet products or molded goods. This method enables the creation of mono-layer or multi-layer film / sheet products with improved properties, contributing to sustainable and environmentally friendly manufacturing practices.

The invention discloses a process for preparing a polyester fiber fabric by regenerating polyester waste bottle flakes, belongs to the technical field of polyester fiber fabric processing, and aims to solve the technical problem that the moisture absorption and quick drying performance, friction resistance and pilling resistance of the polyester fiber fabric in the prior art need to be further improved. The method comprises the following steps: adding polyester waste bottle flakes into a pulverizer, pulverizing, sieving with a 60-mesh sieve to obtain polyester regenerated powder, and pretreating the polyester regenerated powder to obtain pretreated polyester powder; composite polyester is prepared from modified polysiloxane enhanced copolyester containing nylon 6 and polyvinyl alcohol blocks, and then the porous composite polyester fiber is prepared by taking polyvinyl alcohol as a pore forming agent, so that the moisture absorption and quick drying performance of the polyester fiber fabric is effectively improved, the wearing experience of the polyester fiber fabric is enhanced, and the service life of the polyester fiber fabric is prolonged. The wear-resistant and anti-pilling performance of the polyester fiber fabric is also improved.

The invention discloses a recycling method of polyethylene glycol terephthalate (PET). According to the method, organic acid is used as a catalyst for hydrolysis of PET, the organic acid is selected from one or more of adipic acid, lactic acid and glycollic acid, and then hydrolysis products are directly polymerized with additional monomers and polymerization catalysts to prepare the biodegradable copolyester without any separation treatment step. The prepared copolyester has biodegradability, so that the non-degradable PET is converted into the biodegradable copolyester by the recycling method, and the recycling method has important significance for relieving the problem of environmental pollution.

The invention provides a PEF hydrogen bond reinforced modified polyester material and a preparation method thereof, and the preparation method comprises the following steps: blending 2, 5-furandicarboxylic acid and a third monomer hydroxy acid, and copolymerizing under the action of ethylene glycol to synthesize bio-based furan polyester, namely the PEF hydrogen bond reinforced modified polyester material. The introduced hydroxyl is used as a hydrogen bond donor to enhance the PEF copolyester material, so that the interaction strength and the chain stacking density between PEF chains are improved, the toughness, the melt strength and the crystallization rate of PEF can be improved by only adding a small amount of hydroxyl, and the barrier property of PEF copolyester is maintained to be more than 5 times of that of PET (Polyethylene Terephthalate).

The invention relates to the technical field of organic polymers, and discloses a special copolyester for a high-speed stretch film and a preparation method thereof.The special copolyester is prepared from, by mass, 50-60 parts of terephthalic acid, 20-30 parts of ethylene glycol, 5-20 parts of a polymerizable eutectic solvent, 0.02-0.03 part of a catalyst and 0.002-0.003 part of a stabilizer; the copolyester is prepared by polymerizing terephthalic acid, ethylene glycol, the polymerizable eutectic solvent, the catalyst and the stabilizer, and the polymerizable eutectic solvent has relatively high conductivity after polymerization, so that the melt resistivity of the polyester can be improved, and the toughness and transparency of the polyester can be improved; the problems of polyester crystallization and yellowing caused by electrostatic agents such as metal compounds can be avoided; the copolyester is low in melt resistivity, simple and feasible in preparation method and suitable for high-speed film drawing production.

The invention discloses a method for preparing antibacterial and antistatic polyester fibers by regenerating waste polyester, belongs to the technical field of polyester fiber processing, and is used for solving the technical problem that the antistatic performance, moisture absorption performance and antibacterial performance of polyester fibers in the prior art need to be further improved. The method specifically comprises the following steps: crushing waste polyester, performing alcoholysis to prepare an alcoholysis extract, mixing the alcoholysis extract, polytetrahydrofuran ether glycol, 1, 4-butylene glycol and a catalyst under the protection of inert gas, and performing reaction to obtain the polytetrahydrofuran ether glycol / 1, 4-butylene glycol / polytetrahydrofuran ether glycol / 1, 4-butylene glycol / polytetrahydrofuran ether glycol / 1, 4-butylene glycol composite material. According to the invention, the olefin modified silver-loaded montmorillonite and hydroxyethyl methylacrylate reinforced copolyester polyester fiber with a flexible polyether block structure is subjected to padding modification through the reinforcing modifier, so that the breaking strength and the antistatic property of the polyester fiber are effectively improved, and the moisture absorption property and the antibacterial property of the polyester fiber are also improved.

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 invention discloses a full bio-based copolymer based on a citric acid bicyclic monomer, a preparation method and an application, and belongs to the technical field of material synthesis, citric acid-derived bicyclic OPD diol and OPBMC diester are synthesized through oxidation reduction and transesterification, and then 1, 4-butanediol is partially replaced with OPD or 2, 4-butanediol is partially replaced with OPBMC through melt phase polycondensation reaction. Two series of random copolyester PBxOyF copolymer and PBOmFn copolymer of the PBF are prepared by adding 2, 5-dimethyl furandicarboxylate into the PBF, and then adding the PBxOyF copolymer and the PBOmFn copolymer into the PBF. According to the full-bio-based copolymer based on the citric acid bicyclic monomer, the preparation method and the application, the citric acid bicyclic monomer obviously improves the glass transition temperature and shows good mechanical properties; therefore, the bicyclic monomer based on citric acid has huge potential in the aspect of synthesizing novel bio-based copolyester with expected thermodynamic properties, and is expected to further expand the application range of the 2.5 furandicarboxylic acid-based polyester.

Disclosed herein are systems and methods of using a coating solution such as an aromatic copolyester thermoset (ACT) to improve the wear, galling, and corrosion resistances of downhole tools and their sub-components. Aromatic copolyester thermoset may be reinforced with filler material. Further, the aromatic copolyester thermoset reinforced with filler material may be used in a borehole as a composite hollow profile, for example. In some examples, the systems may comprise a substrate for downhole applications coated with an aromatic thermosetting copolyester mixed with polytetrafluoroethylene (PTFE).

The invention discloses high-crystallinity copolyester based on furandicarboxylic acid as well as a preparation method and application of the high-crystallinity copolyester. The structural formula of the high-crystallinity copolyester is as follows: # imgabs0 # R1 is-O (CH2) aO-, R2 is-O (CH2) bO-, a, b, x, y, z and n are integers, a = 2-6, b = 6-12, x = 1-10, y = 1-10, z = 1-10, and n = 20-100; and (x + z): y = 1: 1-1: 10. The present invention also provides a highly crystalline copolyester article made from the highly crystalline copolyester. The high-crystallinity copolyester disclosed by the invention not only has excellent crystallization capacity, relatively high crystallinity, excellent thermal stability and mechanical property, but also has excellent barrier property, and has obvious advantages in various gas barrier aspects compared with PET (Polyethylene Terephthalate) on the market; the material can be widely applied to the fields of high-temperature-resistant materials, express packages, food packages, food tableware and the like.

The invention discloses a composite medical suture and a preparation method thereof, and belongs to the field of biomedicine. In order to solve the problems that an existing medical suture is poor in antibacterial effect and biological safety, the composite medical suture comprises a core layer, a degradation regulation and control layer, a slow release layer and an antibacterial layer which are sequentially arranged from inside to outside; the core layer is prepared from a blend fiber of poly (hydroxybutyrate-hydroxyvalerate) and polycaprolactone-co-polyglycolide; the degradation regulation and control layer comprises a mixture of at least two kinds of polyethylene glycol with different molecular weights; the slow release layer comprises quaternary ammonium salt loaded graphene oxide nanofibers; the antibacterial layer comprises titanium dioxide loaded with silver nanoparticles. Through the synergistic effect of the four layers, the comprehensive optimization of mechanical properties, degradation rate, drug sustained release and antibacterial function is realized; the purposes of improving the slow-release antibacterial performance, reducing damage to the human body, reducing inflammation and the like are achieved, and the antibacterial and degradation effects meet the recovery requirements.

The invention belongs to the technical field of copolymerization modification of degradable polyester, and relates to a depolymerization method and application of polybutylene terephthalate. During depolymerization, polybutylene terephthalate, dimethyl carbonate and dihydric alcohol are mixed and then subjected to a depolymerization reaction, and an intermediate ester is prepared; the dihydric alcohol is dihydric alcohol which does not form a ring with dimethyl carbonate in the depolymerization reaction process; the molar weight of the dimethyl carbonate is 10-30% of the molar weight of a repetitive unit of the polybutylene terephthalate; the sum of the molar weight of a 1, 4-butanediol unit in the polybutylene terephthalate and the molar weight of the added dihydric alcohol is a, the sum of the molar weight of a terephthalic acid unit in the polybutylene terephthalate and the molar weight of the added dimethyl carbonate is b, and the ratio of b to a is (1.2-1.5): 1; during application, the prepared intermediate ester is subjected to transesterification under the condition of negative pressure to obtain the copolyester. The depolymerization method is simple and easy to implement; the depolymerization product can be directly applied.

The invention provides a semi-crystalline transparent multicomponent copolyester and a preparation method thereof, and relates to the technical field of polyester synthesis. The preparation method of the semi-crystalline high-transparency multicomponent copolyester comprises the following steps: esterification reaction: mixing terephthalic acid, ethylene glycol, a branching agent, a modified monomer and a main catalyst, and carrying out esterification reaction to obtain an esterification product; and condensation polymerization: mixing the esterification product with a main catalyst, and carrying out condensation polymerization to obtain the semi-crystalline high-transparency multi-component copolyester, the mixture of the esterification reaction and / or the condensation polymerization reaction comprises a cocatalyst. According to the preparation method disclosed by the invention, polyester is subjected to copolymerization modification with relatively low content of alcohol and / or acid modified monomers to obtain the semi-crystalline multicomponent copolyester, and the semi-crystalline multicomponent copolyester is endowed with the advantages of high transparency, high hue, low cost, easiness in processing and the like.

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.

The invention relates to an aliphatic copolyester elastomer and a preparation method thereof, and belongs to the field of high polymer materials. The elastomer is prepared through a series ring-opening copolymerization reaction of epoxide and cyclic anhydride, and the method comprises the following steps: under the action of a metal-free catalyst (a phosphazene ligand P1-tert-octyl / triethyl boron system) and an initiator (terephthalyl alcohol), carrying out a series ring-opening copolymerization reaction on epoxide and cyclic anhydride, the preparation method comprises the following steps: reacting epoxide (such as epoxypropane and allyl glycidyl ether) with aliphatic anhydride (such as glutaric anhydride) in a xylene solvent to generate a polyester prepolymer retaining an active end; adding a second group of epoxide (such as cyclohexene oxide) and anhydride (such as tetrahydrophthalic anhydride and norbornene dianhydride), continuously reacting to form a block copolymer, and then crosslinking. The material performance can be regulated by changing the monomer combination, the atom economy is high, and the raw materials can be produced on a large scale. The process is simple and environment-friendly, and a new choice is provided for application of the degradable elastomer in the fields of medical treatment, environmental protection and the like.

The invention relates to the technical field of polyester fibers, and discloses a waterproof and antibacterial polyester fiber fabric and a preparation method thereof. N,N'-bis(2-hydroxyethyl)ethylenediamine, N,N'-di-Boc-S-methylisothiourea and the like are used as raw materials, and the raw materials are subjected to an esterification polycondensation reaction with dimethyl terephthalate to obtain a waterproof and antibacterial copolyester polymer having a structure similar to that of PET polyester. The waterproof and antibacterial copolyester polymer contains a quaternary ammonium salt, a guanidine group and a hydrophobic long chain structure, which can be evenly distributed in a polyester fiber matrix, thereby avoiding the migration of antibacterial groups and better exerting the antibacterial performance against bacteria. The C-F bond energy is high, and fluorine atoms are more easily embedded in the polymer, blocking the channel for water molecules to migrate into the inside of the coating film, and a stable protective layer can be formed on the surface of the fiber fabric to wrap the fiber and prevent water from penetrating into the inside of the fiber, thereby playing a waterproof role. At the same time, the hydrophobic layer also has certain durability and can withstand multiple washings without failure.

The invention relates to an amorphous low-temperature-resistant polyester composition and a preparation method thereof. The amorphous low-temperature-resistant composition consists of the following raw materials: a rigid structural unit of copolyester consisting of purified terephthalic acid and phenyl glycol; purified terephthalic acid, isophthalic acid and 1, 4-butanediol form an amorphous flexible structure unit; different linear molecular chains are reasonably connected through a branching agent, the acting force between the molecular chains is increased, the defect that the acting force between linear high molecular molecules is low is overcome, and finally the amorphous low-temperature-resistant polyester composition with soft / hard blocks and a branched structure is formed.

The present disclosure relates to a PET composite material and a preparation method therefor. The composite material comprises the following components in parts by mass: 50-100 parts of PET, 5-30 parts of an inorganic filler, and 5-30 parts of a PET copolyester. The PET copolyester is obtained by melting a waste pressure-sensitive adhesive product, adding an alcoholysis agent and a catalyst, and then performing polycondensation, wherein the waste pressure-sensitive adhesive product comprises a PET matrix and a pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer comprises a copolyester elastomer, the copolyester elastomer is a copolymer of a carboxyl-terminated polyester and an amorphous carbon dioxide-based polyester diol, and the number-average molecular weight of the PET copolyester is 50,000 or below.

The invention discloses an anti-fouling curtain structure for water dredging engineering, and belongs to the technical field of environment protection of dredging engineering, the anti-fouling curtain structure for water dredging engineering comprises a floating body, an anti-fouling curtain and a vertical body, the floating body is arranged at the top end of the anti-fouling curtain, the vertical body is arranged at the bottom end of the anti-fouling curtain, and the anti-fouling curtain is geotechnical cloth; the geotechnical cloth is prepared from the following components in parts by weight: 100 to 150 parts of polyester, 20 to 50 parts of copolyester and 5 to 30 parts of inorganic filler, the copolyester is a copolymer of terephthalic acid, 5-sulfoisophthalic acid sodium salt, ethylene glycol and dihydroxyl-terminated polyvinyl imidazole, and the geotechnical cloth is further prepared by a post-treatment step. According to the invention, the copolyester composed of terephthalic acid, sodium 5-sulfoisophthalic acid, ethylene glycol and dihydroxyl-terminated polyvinyl imidazole and the inorganic filler are added into the polyester fiber, and the polyester fiber is modified through a post-treatment step, so that the alkali resistance and the antifouling property of the antifouling curtain are improved.

The invention relates to the technical field of high polymer materials, and discloses a preparation method of a modified master batch degradable material and application of the modified master batch degradable material in a packaging lunch box, and the modified master batch degradable material comprises the following components by mass: 75.0-93.8 parts of poly (butylene succinate); 5.0 to 20.0 parts of aliphatic series-aromatic copolyester; 1.0 to 4.0 parts of 1, 1 '-methylenebis-4, 1-phenylene-bismaleimide, and 1.0 to 4.0 parts of 1, 1'-methylenebis-4, 1-phenylene-bismaleimide; 0.5 to 2.0 parts of talcum powder; the method comprises the following steps: mixing dried poly (butylene succinate), aliphatic-aromatic copolyester, bismaleimide and talcum powder, performing reactive extrusion and melt mixing through a twin-screw extruder, and then cooling, pelletizing and drying the extrudate. Through specific components and a reactive extrusion process, a dynamic cross-linked network is formed by utilizing a Diels-Alder reaction, and the modified master batch degradable material of which the comprehensive mechanical property and the heat resistance are remarkably improved is prepared.

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 present invention relates to a dental diaphragm copolyester and a preparation method thereof, the preparation method comprises the following steps: 2, 5-furandicarboxylic acid or an ester thereof, aliphatic or alicyclic diol and (2-hydroxy-5-formyl phenyl) diphenylborane are subjected to a reaction to obtain an esterification or ester exchange product; and carrying out condensation polymerization on the esterification or ester exchange product and the stabilizer to prepare the copolyester for the dental diaphragm. 2, 5-furandicarboxylic acid is derived from a renewable biomass resource and meets the requirements of green and sustainable development; compared with terephthalic acid and furan ring structures, the film has higher rigidity and polarity, the yield of hot press molding is improved, the same correction force can be met by a thinner film, the wearing comfort of a patient is improved, and meanwhile stress relaxation is improved; the catalyst perfectly combines strong Lewis acidity, intramolecular stabilization and potential bifunctional activation through structural design, provides possibility for efficient and green synthesis of polyester, avoids use of heavy metal, and is higher in biological safety.

The present invention discloses a method for preparing a recycled copolyester and a heat-shrinkable film thereof, belonging to the field of waste polyester recycling. The method utilizes technologies such as glycolysis and methanol transesterification of waste polyester to produce recycled dimethyl terephthalate, which is then transesterified with other modifying monomers and ethylene glycol, followed by polycondensation, to produce the recycled copolyester. Finally, the recycled copolyester is directly delivered to the extrusion dies via a melt delivery pipeline and a metering pump to produce the recycled polyester heat-shrinkable film. The recycled polyester heat-shrinkable film exhibits high shrinkage, excellent toughness, and transparency, while also achieving high-value recycling of waste polyester.

The invention relates to the field of bio-based composite materials, and discloses a bioplastic-based coupling agent, a modified bamboo fiber, a composite material and a preparation method and application of the bioplastic-based coupling agent and the modified bamboo fiber. The coupling agent is a product obtained by modifying polyhydroxybutyrate valerate and a grafting monomer, and the grafting monomer is at least one of maleic anhydride, acrylic acid or itaconic anhydride. The delignification bamboo powder is modified with the coupling agent, and the modified bamboo fiber, polyhydroxybutyrate-hydroxyvalerate, an initiator and an auxiliary agent are subjected to melt blending to obtain the composite material. The tensile strength and the bending strength of the composite material are respectively improved by 175% and 117%, and the crystallization ability and the thermal stability are also synchronously improved. According to the invention, the unification of high strength, thermal stability and excellent interfacial compatibility is realized while the degradability of the system is maintained, and the composite material has a good green composite material application prospect.

In one aspect, the present disclosure relates to a flame retardant plastic composition comprising a polymer component and a brominated flame retardant (BrFR), where the BrFR comprises one or more particles at least partially encapsulated by a thermoplastic toughening agent. In some aspects, the encapsulation can take the form of a core-shell structure wherein the shell has an average thickness of about 5 nm to 10 [mu] m. The thermoplastic toughening agent can be selected from the group consisting of styrenic block copolymers, thermoplastic polyurethanes, nitrile rubbers, acrylic elastomers, copolyester elastomers, thermoplastic polyether ester elastomers, thermoplastic amide ether elastomers, chlorinated rubbers, ionomers, thermoplastic vulcanizates, and combinations thereof. The flame-retardant plastic composition additionally comprises a filler and / or a compatibilizer. A method for preparing the flame retardant plastic composition and articles made from the composition are also disclosed.

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 relates to the technical field of fabrics, in particular to a cool-feeling long cilia strip and a preparation method thereof.The cool-feeling long cilia strip is composed of cool-feeling fibers and a long cilia strip base material and is characterized in that the cool-feeling fibers comprise a core layer, a functional skin layer and an outer thin skin layer; the functional skin layer is prepared from the following components: a sulfonated copolyester matrix, catechol grafted master batch, surface modified zeolite nano powder, an anti-hydrolysis agent and an antioxidant, and the functional skin layer also contains introduced Zn < 2 + > and Mg < 2 + >. Zn < 2 + > and Mg < 2 + > which are stably combined on anchoring points of sulfonated copolyester are subjected to hydration endothermic reaction when being in contact with water, so that a cool feeling is generated; the surface modified zeolite nano powder synergistically enhances moisture absorption and water temporary storage by virtue of the specific surface area, and continuously provides water for an ionized hydration reaction to prolong and amplify a cool feeling effect; the catechol grafting structure endows the fiber with antibacterial performance, and long-term stability of the structure is ensured through an interface enhancement effect. And the outer layer hydrophilic polyester is matched, so that the product has comfort, durability and functionality.

The invention relates to the technical field of film products, in particular to a tear-resistant high-toughness functional polyester film and a preparation process thereof. The problem that a polyester film is poor in toughness is solved. The preparation method comprises the following steps: preparing copolyester particles, carrying out melt extrusion on the copolyester particles, triphenyl phosphate and tris (2, 4-di-tert-butylphenyl) phosphite, and carrying out shock cooling treatment to obtain a base material layer; the method comprises the following steps: preparing a core-shell toughening agent, mixing the core-shell toughening agent with a polyurethane prepolymer and a photoinitiator, and coating the mixture on the surface of a base material layer to obtain a toughening layer; surface grafting carbon nanotubes are prepared and form a composite system with sulfuric acid swelling aramid nanofibers, and an anti-tearing layer is formed through an electrostatic spinning process; mixing an isocyanate prepolymer, a silane coupling agent and nano silica sol, spraying the mixture on the surface of the tear-resistant layer, and performing in-situ polymerization and post-curing to obtain an interface bonding layer; the prepared polyester film has excellent toughness.

The invention discloses a crystallinity low-melting-point polyester fiber and a preparation method thereof, and relates to the technical field of polyester fibers, the crystallinity low-melting-point polyester fiber is composed of a skin layer and a core layer, and a skin-core integrated crystallization design is adopted; the skin layer is modified copolyester, and the core layer is modified PET; the modified copolyester is prepared from the following raw materials in parts by weight: 38 to 42 parts of terephthalic acid, 12 to 15 parts of 2, 5-furandicarboxylic acid, 28 to 32 parts of 1, 4-cyclohexanedimethanol, 8 to 10 parts of polycaprolactone, 1.0 to 1.5 parts of a crystallization coordinating agent, 0.5 to 1.0 part of an antioxidant and 0.3 to 0.5 part of a hindered amine light stabilizer. The crystallization coordinating agent is prepared by compounding hydroxylated graphene and maleic anhydride grafted polyolefin elastomer according to a mass ratio of (2 to 3): 1. The fiber is good in high temperature resistance and durability, low in melting point, good in size stability and long in service life.

The present invention relates to a process for producing specialty polyesters and copolyesters from recycled bis-2-hydroxyethyl terephthalate (rBHET), which is derived from polyethylene terephthalate (PET) recovered from PET scrap or waste. The polyesters / copolyesters thus obtained are clean and high-quality and can be used in all applications, including but not limited to textiles, packaging, engineering, and industry.