408 results about "Copolyester" patented technology

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 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 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 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 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.

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 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 invention provides isosorbide-based copolyester as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. According to the preparation method, a step-by-step esterification method is adopted, firstly, isosorbide, excessive aromatic dicarboxylic acid and an acylating agent are subjected to a first esterification reaction, so that the acylating agent can efficiently and specifically activate secondary hydroxyl of isosorbide, and the initial esterification rate of isosorbide is greatly increased. Meanwhile, the excessive aromatic dicarboxylic acid ensures that the generated isosorbide prepolymer takes carboxyl as a terminal group, so that isosorbide molecules are'locked 'in the middle of a polymer chain segment. Due to the fact that the isosorbide is embedded in the middle of the chain segment in advance, the problem that the isosorbide falls off in the ester exchange reaction due to the fact that the isosorbide is located at the chain end and low in reaction activity in the subsequent polycondensation stage is effectively solved, and therefore the retention rate of the isosorbide in the final polymer is greatly increased, and the glass-transition temperature of the isosorbide is greatly increased.

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 belongs to the technical field of high polymer materials, and discloses copolyester based on 4-aryl-epsilon-caprolactone and lactide as well as a preparation method and application of the copolyester. The copolyester is composed of a lactide structural unit and a 4-aryl-epsilon-caprolactone structural unit. A rigid benzene ring is introduced into a molecular chain, so that the synergistic balance of toughness and rigidity is successfully realized, and the toughness is remarkably improved while the high strength of the material is maintained. In addition, the introduction of phenyl endows the material with intrinsic ultraviolet resistance, the material can be used as an efficient ultraviolet absorbent, protective spherical protrusions are formed on the surface of the material under ultraviolet irradiation, and photooxidative degradation is effectively delayed. The material can be widely applied to the fields of high-performance degradable packaging, biomedical materials, outdoor articles, textiles and the like.

The utility model belongs to the technical field of polymerization reaction kettles, and particularly relates to an anti-yellowing physical foaming PBT copolyester polymerization reaction kettle which comprises a bottom plate, a plurality of supporting frames are symmetrically arranged at the top end of the bottom plate, the supporting frames are L-shaped, mounting rings are arranged at the top ends of transverse frames of the supporting frames, an outer kettle body is arranged in the mounting rings, and the outer kettle body is arranged in the bottom plate. An inner kettle body is arranged in the outer kettle body, a fixing rod is arranged at the top end of the bottom plate, a chassis is arranged at the top end of the fixing rod, a material mixing assembly is arranged in the inner kettle body and comprises a rotating shaft, the rotating shaft is sleeved with a plurality of shaft sleeves, and a plurality of material mixing rods are arranged on the outer side walls of the shaft sleeves in a surrounding mode; a plurality of scrapers are arranged on the top end surface of the chassis, and a plurality of stirring rods are arranged on the outer side walls of the scrapers in parallel, so that materials can be uniformly mixed, the heat of the device can be preserved, and the materials react under proper conditions.

The invention provides a dental diaphragm with stress relaxation resistance as well as a preparation method and application thereof, and relates to the technical field of orthodontic materials. The dental diaphragm resistant to stress relaxation comprises a branched modified copolyester diaphragm, wherein the branched modified copolyester film is prepared from the following raw materials: terephthalic acid, alicyclic structure dihydric alcohol, side group dihydric alcohol and a polyfunctional group branching agent; wherein the glass transition temperature of the branched modified copolyester film is more than or equal to 80 DEG C, the light transmittance of the branched modified copolyester film is more than or equal to 86%, and the 24-hour tension attenuation rate of the branched modified copolyester film is less than or equal to 20%. The dental diaphragm provided by the invention has excellent tensile attenuation resistance, heat resistance and optical performance, is simple in processing technology, is more suitable for clinical requirements of dental orthodontic correction, and is particularly suitable for preparing dental orthodontic correction devices.

The invention belongs to the technical field of polymer materials, and particularly relates to a polyaromatic-carbonic acid-aliphatic copolyester production method which comprises the following steps: mixing aromatic dibasic acid and aliphatic dihydric alcohol, feeding into a first esterification kettle, and adding an esterification catalyst for esterification reaction to obtain an esterification product; uniformly mixing aliphatic dihydric alcohol, feeding the mixture into a second esterification kettle, adding diester carbonate and a transesterification catalyst into the second esterification kettle, reacting to obtain a transesterification product, and feeding the transesterification product into a demonomerisation kettle to obtain a demonomerisation product; mixing the esterification product and the demonomerisation product with a polycondensation catalyst and a stabilizer, shearing and homogenizing, feeding into a pre-polycondensation kettle for reaction to obtain a pre-polycondensation product, feeding the pre-polycondensation product into a final polycondensation kettle for reaction to obtain a copolymer, and performing water-cooling granulation to obtain a copolyester product. According to the production method provided by the invention, the final polycondensation time can be shortened, and the weight-average molecular weight and the mechanical strength of the prepared copolyester are improved.

A method of making a thermoplastic copolyester elastomer-based fiber is disclosed. The method comprises: providing a thermoplastic copolyester elastomer having a number average molecular weight of greater than 35,000 g / mol; and spinning the thermoplastic copolyester elastomer to provide a fiber comprising a spun thermoplastic copolyester elastomer, wherein the spun thermoplastic copolyester elastomer has a number average molecular weight that is 98% or less to 50% or more the number average molecular weight of the thermoplastic copolyester elastomer. A thermoplastic copolyester elastomer-based fiber made according to the aforementioned method and a fabric comprising the aforementioned thermoplastic copolyester elastomer-based fiber are also disclosed.

The present disclosure relates to a co-polyester resin of a composition including dicarboxylic acid, wherein the composition includes C2-5 aliphatic diol and isosorbide in an amount of 70 mol to 97.5 mol and 2.5 mol to 30 mol, respectively, based on 100 mol of the dicarboxylic acid, and the dicarboxylic acid includes C2-6 aliphatic dicarboxylic acid and cyclic aromatic dicarboxylic acid.

The present disclosure discloses a multi-layer heat-shrink film (10) including a first layer (11), a third layer (15), and a second layer (13) disposed therebetween. The first layer (11) is made of at least one first co-polyester resin and one or more additives. The third layer (15) is made of at least one third co-polyester resin and one or more additives. The second layer (13) is made of at least one second co-polyester resin and one or more additives. The at least one of the first layer (11) and the third layer (15) is relatively more crystalline than the second layer (13).

The application relates to a polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer foaming material and a preparation method thereof, and the preparation method comprises the following steps: melting polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer, and then performing quenching treatment to obtain sheet material; performing annealing treatment on the sheet material, wherein the annealing treatment temperature is (T-25) DEG C to (T+5) DEG C, T is the cold crystallization starting temperature of the polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer, and the annealing treatment time is 3 min to 30 min; the sheet material after the annealing treatment is adsorbed and saturated in a foaming gas to obtain a saturated system, and the saturated system is foamed in a foaming medium to obtain the polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer foaming material. The polyethylene glycol-2,5-furandicarboxylic acid terephthalate copolymer foaming material obtained by the application has a cell size of 2 mu m to 200 mu m and an expansion ratio of 1.5 times to 15 times, and has a good application prospect.

The invention discloses PBET copolyester as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The PBET copolyester has specific diol unit composition, terminal carboxyl group content and half-peak width and peak value of a cold crystallization peak of a second cooling curve, has better mechanical properties and aging resistance, and is suitable for preparing electronic and electrical parts.

The invention relates to the technical field of waste polyester recycling and reusing, and discloses a method for depolymerizing copolyester, a depolymerization product and application of the depolymerization product in preparation of the copolyester. The preparation method comprises the following steps: carrying out a depolymerization reaction on copolyester with an average particle size of 0.1-5 cm to obtain a depolymerization solution containing bis (2-hydroxyethyl) terephthalate, a bis (2-hydroxyethyl) terephthalate dimer and cyclohexanedimethanol terephthalate; wherein the copolyester is polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester, the water content in the copolyester is less than or equal to 2wt%, and the catalyst is a titanium-containing catalyst. According to the method disclosed by the invention, chemical depolymerization of PETG (or PCTG) copolyester can be realized, the depolymerization rate of the copolyester is improved, and a recyclable polymeric monomer is obtained.

The present application relates to a kind of polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester foamed material and its preparation method, the preparation method includes the following steps: polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester material is heat pressed, and the preform of molten state is obtained;The preform of molten state is treated with melt isothermal crystallization and quenching, and sheet material is obtained;Sheet material is treated with foaming, and polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester foamed material is obtained.The present application uses melt isothermal crystallization treatment, can improve the melt strength in the foaming process of polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester, strengthens its foaming performance, simultaneously can also be realized by strengthening bubble nucleation and controlling bubble growth to adjust the bubble morphology of foamed material, so polyethylene terephthalate-2,5-furandicarboxylic acid glycol copolyester foamed material with uniform bubble size and controllable foaming ratio can be obtained.

Provided herein is a novel primer formulation used in a bonded assembly, wherein the bonded assembly comprises A) a substrate; B) a primer layer formed from the primer formulation; and C) an adhesive layer, wherein the primer layer is placed between the substrate and the adhesive layer, and wherein the primer formulation comprises i) at least one film-forming resin selected from polyolefin resins, polyester, copolyester resins, and mixtures of these; and ii) a solvent.

The invention belongs to the technical field of high polymer materials, and discloses a polyester-based chemically recyclable crosslinked elastomer and a preparation method thereof. According to the chemically recyclable cross-linked elastomer, an aliphatic lactone monomer and a furyl substituted lactone monomer are subjected to a copolymerization reaction under the action of a catalyst to form a copolyester prepolymer, and the prepolymer further reacts with a cross-linking agent containing complementary dynamic bonds through a furyl side group of the prepolymer to form a reversible cross-linked network. The cross-linked network can simultaneously realize controllable dissociation of dynamic covalent bonds and selective degradation of a polyester main chain under thermal or chemical stimulation, so that an original monomer is efficiently recovered. The cross-linked elastomer provided by the invention has the advantages of excellent mechanical properties, good heat resistance, capability of closed-loop chemical circulation and the like.

This invention relates to the field of iron ion detection technology, specifically to a copolyester for detecting Fe. 3+ Applications in [the context of the text]. The copolyester contains structural unit A as shown in formula (I) and structural unit B as shown in formula (II), where R [is used in formula (I)]. 11 Selected from groups containing conjugated structures, R 12 Selected from C2-C50 chain alkylene groups, C4-C40 cyclic alkylene groups, or C4-C20 oxygen-containing heterocyclic groups; in formula (II), R 21 Selected from C2-C50 chain alkylene groups, R 22 The copolymer is selected from C2-C50 chain alkylene groups, C4-C40 cyclic alkylene groups, or C4-C20 oxygen-containing heterocyclic groups. The copolyester used in this invention can sensitively detect the presence of iron ions, and has good application prospects in the detection of iron ions in food, pharmaceuticals, soil, water, etc.

The application discloses a method for preparing PETG biodegradable copolyester from waste PET polyester. The method comprises the following steps: mixing waste PET polyester, alcoholysis agent and catalyst, heating to perform alcoholysis reaction, controlling alcoholysis reaction conditions to stop the reaction when the PET polyester is depolymerized into an oligomer with a number average molecular weight of 1000-2000 g / mol and a polymerization degree of 5-8, then supplementing monomers, and completing polycondensation reaction under high vacuum conditions to obtain PETG copolyester. The scheme has the advantages of simple process route, small catalyst consumption, no need to supplement catalyst during polycondensation reaction, low energy consumption, realization of conversion of non-degradable PET into biodegradable copolyester, and important significance for relieving plastic pollution problems.

The application discloses a kind of carbonic anhydrase catalysis CO2 Mineralization enhanced bamboo fiber composite material and preparation method thereof, belong to environmental protection material field.The composite material formula includes by weight parts 15-20 parts of terephthalic acid, 1,4-butanediol 16-25 parts, catalyst 0.2-1 part, bamboo fiber 50-55 parts, calcium chloride 5-8 parts, carbonic anhydrase 0.01-0.03 parts, pH regulator 1-2 parts, antioxidant 0.3-1 part.The preparation process is first used carbonic anhydrase mineralization bamboo fiber, and obtains mineralization bamboo fiber, and PBT is synthesized under the catalysis of catalyst to obtain mineralization bamboo fiber-PBT copolyester composite material.The composite material prepared by the scheme has the characteristics of degradability, low cost, good interfacial compatibility and excellent mechanical properties.

A process for producing 1,4-cyclohexanedimethanol by depolymerizing one or more recycled terephthalate-based polyesters or copolyesters via solvolysis with one or more glycols or alcohols and contacting the depolymerization product with an ester hydrogenolysis catalyst and hydrogen to produce a hydrogenolysis product and contacting the hydrogenolysis product with a hydrogenation catalyst and hydrogen to produce 1,4- cyclohexanedimethanol.

The invention discloses an ultraviolet-responsive degradable polyester and a preparation method thereof, the ultraviolet-responsive degradable polyester is a copolyester composed of an aliphatic polyester segment and a photosensitive o-nitrobenzyl ester segment, and the ultraviolet-responsive degradable polyester is prepared by carrying out ring-opening-condensation cascade polymerization on aliphatic cyclic diol diacid ester and o-nitrobenzene dimethanol as monomers. Or dibasic acid, dihydric alcohol and o-nitrobenzene dimethyl carbinol are used as monomers to be prepared through condensation polymerization. The main chain of the polyester contains a photo-response unit based on o-nitrobenzyl ester, intramolecular isomerization can occur under ultraviolet irradiation and causes breakage of a molecular chain, and the molecular weight of the polymer can be quickly reduced in a short time to form a low-molecular-weight degradation product; the degradation product has certain solubility in alcohol, water or alkaline alcohol water solution and the like, and can be dissolved by using the solvent; through the dissolvability difference of an exposed part and a non-exposed part in the solvent, the solvent can be applied to the field of ultraviolet light degradation materials such as photoresists and the like.

The invention discloses a high-elastic sweat-absorbent polyester yarn and a manufacturing method thereof, and belongs to the technical field of chemical fiber manufacturing, and the method comprises the following steps: preparing three copolyesters with matched intrinsic viscosity, preparing polypropylene glycol-containing hydrophilic copolyesters A and B through step-by-step esterification and copolycondensation, preparing polytetrahydrofuran-containing copolyester C through co-esterification, and preparing the high-elastic sweat-absorbent polyester yarn. And extruding through a multi-channel composite spinneret plate to form a calabash-shaped core layer and a spirally wound surface layer structure. According to the high-elasticity sweat-absorbent polyester yarn and the manufacturing method thereof, the fibers achieve moisture absorption and quick drying through the hydrophilic groups on the surface layer and the porous structure of the core layer, and the fibers and the calabash-shaped core layer cooperatively deform by means of the spiral elasticity design, so that the high-elasticity sweat-absorbent polyester yarn has high resilience and comfort.

A copolyester composition comprising a metal phosphinate flame retardant, an acrylic silicone impact modifier, and a silicate mineral, which provides high tensile and / or flexural modulus while maintaining thermal and impact properties and having improved flame retardant properties, a method for manufacturing the copolyester composition, and an article manufactured from the copolyester composition are provided.

The present invention relates to novel carbodiimides, to a process for their production, and to the use of the novel carbodiimides in ester-based polyols, in polyethylene terephthalate (PET), in polybutylene terephthalate (PBT), in polytrimethylene terephthalate (PTT), in copolyesters, in thermoplastic polyester elastomers (TPE E), in ethylene vinyl acetate (EVA), in polylactic acid (PLA) and / or in PLA derivatives, in polybutylene adipate terephthalate (PBAT), in polybutylene succinate (PBS), in polyhydroxyalkanoates (PHA), in blends, in triglycerides, in thermoplastic polyurethanes, in polyurethane elastomers, in PU adhesives, in PU casting resins, for PU coatings or in PU foams as stabilizers.