230 results about "Biodegradable polyester" patented technology

The invention relates to the technical field of high polymer material preparation, and discloses a bamboo fiber graft modified full-biodegradable composite membrane material preparation process which comprises the following steps: firstly, performing hot mixing and cooling on dried bamboo fiber powder, anhydrous citric acid, choline chloride, activated zinc oxide and pentaerythritol to prepare a bamboo fiber modified premix; then mixing the biodegradable polyester resin with the premix; adding the mixture into an extruder, injecting epoxidized soybean oil into a barrel through a liquid metering device, and performing melt extrusion granulation under a vacuum exhaust condition; and finally carrying out blow molding to form the film. Through in-situ reaction extrusion of multi-component synergism, surface grafting of bamboo fibers, chain extension of a polyester matrix and interface chemical bonding of the bamboo fibers and the polyester matrix are achieved, interface compatibility is effectively improved, degradation of the material in the processing process is inhibited, and the mechanical property and thermal stability of the composite film material are remarkably improved; the process is efficient and environment-friendly, and the cost is controllable.

The recycled bis(4-hydroxybutyl) terephthalate according to one embodiment has a low amount of residual ethylene glycol derivatives and can therefore be used as a polymerization raw material for high crystallinity engineering polyester products or biodegradable polyesters, offering superior qualities, for example, color.

The invention relates to a multilayer packaging material with high barrier property and application thereof. The multi-layer packaging material at least comprises three layers, namely a layer A, a layer B and a layer C, wherein the layer B is located between the layer A and the layer C; the layer A is prepared from the following raw materials: first biodegradable polyurethane and a cellulose nanocrystal graft which is obtained by performing grafting treatment on cellulose nanocrystal after hydrophobic modification, and the content of the cellulose nanocrystal graft is 1wt%-10wt% of that of the first biodegradable polyurethane; the raw material of the layer B comprises biodegradable polyester containing a glycollic acid structural unit, and the content of the glycollic acid structural unit is not less than 60% mol; the raw material of the layer C comprises second biodegradable polyurethane. The hydrophobic modified cellulose nanocrystals are uniformly dispersed in the layer A, so that the adsorption of water vapor on the layer A is reduced, the permeation of the water vapor is hindered, and the barrier property of the whole material is improved.

The invention relates to the technical field of foaming, and discloses a multi-layer co-extrusion foaming buffer cotton continuous production forming process which comprises the following steps: pretreating raw materials, respectively placing polyolefin resin, biodegradable polyester and foaming agent master batch in a vacuum drying oven, drying at 60 + / -5 DEG C for 2-4 hours, controlling the water content to be less than 0.1 wt%, melting and co-extruding to obtain the multi-layer co-extrusion foaming buffer cotton. When multi-layer co-extrusion synchronous foaming is carried out, by establishing a melt pressure dynamic threshold standard and setting differential pressure control parameters for different functional layers, the stability of interface bonding of all co-extrusion layers is guaranteed, and meanwhile, melt pressure fluctuation in the supercritical fluid injection process is subjected to feedback analysis in real time; according to the method, whether the problem of abnormal fluctuation of melt pressure occurs on a co-extrusion layer interface or not can be detected in real time, the structural integrity of interlayer bonding is guaranteed, the risk of cell collapse is further reduced, and when foaming ratio mismatch is detected, temperature field distribution can be adjusted in real time according to preset gradient foaming parameters.

Disclosed are biodegradable polyesters. Methods for their production and adhesives prepared therefrom. The polyesters comprise a plurality of adducts of two dicarboxylates or anhydrides with a compound having at least two fused ring heterocycles containing a heteroatom and a hydroxyl group pendant from each ring, the adducts are linked by the residues of one or more diols of alkylene diols or polyoxyalkylene diols and a plurality of one or more aliphatic diols containing a pendant carboxylate group. Ester groups are formed by reaction of the hydroxyl groups of the fused ring compounds and the diols with the carboxylate groups of the dicarboxylates and the composition contains pendant carboxylate groups, wherein the composition contains two dicarboxylates, a first dicarboxylate or an anhydride containing between the carboxylate or carboxyl groups a C1-8 hydrocarbylene group and a second dicarboxylate containing between the carboxylate groups a C9-60 hydrocarbylene group.

Disclosed are biodegradable polyesters prepared from bio sourced materials and methods for their production. The polyesters comprise a plurality of adducts of two dicarboxylates or anhydrides with a compound having at least two fused ring heterocycles wherein each heterocycle contains a heteroatom of oxygen or sulfur and at least one hydroxyl group pendant from each ring. wherein the plurality of adducts are linked by a plurality of residues of one or more diols of alkylene diols or polyoxyalkylene diols and a plurality of one or more aliphatic diols containing a pendant carboxylate group wherein ester groups are formed by reaction of the hydroxyl groups of the fused ring compounds and the diols with the carboxylate groups of the dicarboxylates and the composition contains pendant carboxylate groups.

The invention belongs to the technical field of high polymer materials, and particularly relates to a polylactic acid blended composite material applied to automotive interiors and a preparation method thereof. The raw material of the material is polylactic acid modified ionomer or polylactic acid modified copolymer; a biodegradable polyester or elastomer; a chain extender; an anti-hydrolysis agent; an antioxidant; a nucleating agent; and a lubricant. The preparation method comprises the following steps: carrying out vacuum drying on the polylactic acid ionomer or the polylactic acid modified copolymer and the biodegradable polyester or the elastomer; uniformly mixing the dried polylactic acid ionomer or polylactic acid modified copolymer, biodegradable polyester or elastomer, a chain extender, an antioxidant and a lubricant to obtain a mixture; melting, blending and extruding the mixture; water in the material is pumped out at the tail end of an extruder in a vacuumizing mode, and the polylactic acid blending composite material is obtained after the procedures of water cooling, grain-sized dicing and drying. The material disclosed by the invention has excellent characteristics of high rigidity, high toughness, heat resistance, ultraviolet resistance, antibacterial property and the like, and can be applied to the field of automotive upholstery.

The invention discloses a paper-based molded coffee capsule capable of being naturally composted, a PHA aqueous dispersion in-situ film forming barrier heat-sealing composite layer, a preparation method and application thereof, and belongs to the field of degradable packaging and single-cup extraction capsules. The capsule body is formed by molding paper pulp and is provided with a side wall, a bottom wall and a mouth flange; the biodegradable polyester-based film sealing component is connected to the flange in a sealing manner; and the polyhydroxyalkanoate barrier heat-sealing composite layer covers the inner surface of the body and the sealing surface of the flange. The composite layer is obtained by in-situ film forming of a particle size gradient double-layer aqueous dispersion and comprises a permeation anchoring layer located in paper pulp pores and a continuous compact layer located on the outer side in the thickness direction. The flange is a hot-pressing densified area, and a local thickening heat sealing ring is formed on the sealing face of the flange. Through physical anchoring of the small-particle-size components and surface film forming of the large-particle-size components, the moisture and oxygen blocking and interface bonding performance is achieved, and the brewing sealing performance is guaranteed.

The invention relates to the technical field of fibers, and discloses an easily biodegradable polyester-nylon composite fiber and a preparation process thereof.The preparation method comprises the steps that 2-(2-acrylamido ethyl formate) benzoic acid is subjected to graft modification to obtain modified polylactic acid, and the modified polylactic acid, polyethylene glycol terephthalate PET and nylon 66 resin are subjected to blending melt spinning to obtain the polyester-nylon composite fiber. The modified polylactic acid improves the compatibility between the PET and the nylon 66 resin, so that the polyester-nylon composite fiber has higher mechanical properties, and the tensile strength and the elongation at break are obviously improved. The polylactic acid has better biodegradability, and the introduced ester group also has biodegradability, so that the biological decomposition rate of the fiber is improved. The modified polylactic acid contains a large amount of hydrophilic carboxyl and amido bonds, so that the moisture regain of the composite fiber is improved, and the modified polylactic acid can be better applied to hydrophilic moisture absorption fiber textiles.

The application discloses a paper-based moulded coffee capsule capable of natural composting, a PHA aqueous dispersion in-situ film-forming barrier heat-sealing composite layer and a preparation method and application thereof, and belongs to the field of degradable packaging and single-cup extraction capsules. The capsule comprises a capsule body formed by moulded paper pulp, a side wall, a bottom wall and a mouth flange, a biodegradable polyester-based film sealing member sealed to the flange, and a polyhydroxyalkanoate barrier heat-sealing composite layer coated on the inner surface of the body and the sealing surface of the flange. The composite layer is obtained by in-situ film-forming of a particle size gradient double-layer aqueous dispersion, and comprises an infiltration anchoring layer located in the pores of the paper pulp and a continuous dense layer on the outside along the thickness direction. The flange is a heat-pressed densification area, and a locally thickened heat-sealing ring is formed on the sealing surface of the flange. The application realizes the moisture and oxygen barrier and interface bonding performance through physical anchoring of small particle size components and surface film-forming of large particle size components, and guarantees the brewing sealing performance.

For manufacturing household composting products, Based on the total weight of polylactic acid a) and aliphatic-aromatic biodegradable polyester b), 10 to 85% by weight of at least one polylactic acid a), Based on the total weight of polylactic acid a) and aliphatic-aromatic biodegradable polyester b), 15 to 90% by weight of at least one biodegradable aliphatic-aromatic polyester and Use of polymer compositions containing the above.

The present invention provides a microcapsule composition comprising at least one core-shell microcapsule, wherein the at least one core-shell microcapsule comprises a core comprising at least one benefit agent and a shell surrounding the core, wherein the shell comprises a resin formed by the reaction of: 5 - a Michael acceptor which is the reaction product of a biodegradable polyester polyol with an α,β-unsaturated acid chloride; and - a Michael donor comprising at least two nucleophilic moieties selected from the group consisting of a nitrogen nucleophile, a sulfur nucleophile, an oxygen nucleophile, a carbon nucleophile, a phosphorus nucleophile, and mixtures thereof, which are capable to react with the 10 acrylic double bond of the Michael acceptor. The invention also relates to consumer products comprising the microcapsule composition, a method for preparing the microcapsule composition and to the use of the microcapsule composition to enhance the performance of a benefit agent in a consumer product.

The invention discloses a composite degradation accelerant, a controllable degradation polyester composite material and a preparation method of the controllable degradation polyester composite material. According to the invention, the halloysite-loaded degradation accelerant is used for coating the degradation bacterium spores to form a core-shell structure, so that the composite degradation accelerant is obtained, the thermal stability of the degradation bacterium spores is improved, and the degradation bacterium spores can be subjected to thermal processing with biodegradable polyester; through the synergistic effect of the composite degradation accelerant and the degrading bacteria, the biodegradation rate of the biodegradable material is regulated and controlled; the composite degradation accelerant and biodegradable polyester are blended and compounded, and the degradation rate is regulated and controlled through the design of the load rate and the raw material ratio, so that the problem of poor controllability of the degradation rate of the existing biodegradable material is solved; the production process is simple, and the existing biodegradable polyester modification production line is adopted, so that large-scale industrial production can be realized.

The invention relates to polylactic acid carbon dots as well as a PLA / PVA (polylactic acid / polyvinyl alcohol)-based full-biodegradable polyester composite material and a preservative film thereof. The polylactic acid carbon dots are prepared by a microwave irradiation method, and the full-biodegradable polyester composite material takes PLA as a main base material, PVA as auxiliary resin, food-grade talcum powder as a filler, the polylactic acid carbon dots as a compatilizer, glycerol and stearic acid as lubricants and B215 as an antioxidant. Performing high-speed mixing and stirring to obtain a modified mixture, extruding and pelletizing the modified mixture to obtain a full-biodegradable polyester composite material, and performing film blowing on the polyester composite material to obtain the full-biodegradable preservative film. The polyester composite material prepared by the invention can be biodegraded under a matured compost condition (the test period is 140 days), the biodegradation rate is 91.79%, the relative biodegradation rate is 97.15%, the products are carbon dioxide and water, and inspection items such as the total migration amount and heavy metals meet standard requirements.

The invention belongs to the technical field of biodegradable plastics, and provides a biodegradable film as well as a preparation method and application thereof. The biodegradable film disclosed by the invention is prepared from the following raw materials in 100 parts by weight: 74 to 99.998 parts of biodegradable polyester; 0.001 to 15 parts of gutta-percha; 0-2 parts of a compatilizer; 0.001 to 2 parts of an anti-blocking agent; 0-2 parts of a coupling agent; 0-2 parts of a dispersant; and 0-8 parts of color master batch. The biodegradable polyester is used as a raw material, and the gutta-percha is used as a functional aid, so that the biodegradable film has excellent ultraviolet aging resistance, mechanical property, barrier property and processability; the film mulching safety period of crops can be obviously prolonged, and the method can adapt to different soil conditions and farming operation. The obtained biodegradable film is green and safe in processing and using processes, can be used in the field of agricultural plastic mulching films, and can also be used in the fields of shopping bags, garbage bags, food packaging, vegetable greenhouse films, injection molding plates, injection molding sheets and the like.

The invention provides a controlled release method of a low-additive-amount coal-based quantum carbon dot composite coated slow-release fertilizer, and relates to the technical field of slow-release fertilizers, the controlled release method comprises the following steps: S1, carrying out surface functional modification on coal-based quantum carbon dots, grafting amino and carboxyl on the surfaces of the coal-based quantum carbon dots, and forming molecular-level crosslinking points capable of being subjected to dual crosslinking with inorganic silicon-oxygen bonds and organic ester bonds; s2, sequentially wrapping a basic controlled release shell layer formed by biodegradable polyester and an intelligent response layer embedded with the coal-based quantum carbon dots by taking fertilizer particles as a core through a layer-by-layer spraying and fluidized bed coating process to form a composite coating structure; the coal-based quantum carbon dots subjected to surface functionalization modification serve as molecular-level crosslinking points under the extremely-low addition amount of 0.1-1 wt%, the molecular-level crosslinking points, inorganic silicon-oxygen bonds and organic ester bonds form a double-crosslinking network, the compactness and stability of a coating layer are remarkably improved, and therefore the raw material cost and processing energy consumption are reduced, and green manufacturing is achieved.

Methods of forming compostable polymeric materials and compostable polymeric materials formed through the methods are provided herein. In an embodiment, a method includes blending a biodegradable polymer chosen from a biodegradable polyester, a biodegradable polysaccharide, or combinations thereof, with a polymer-degrading enzyme and a plasticizer to form an intermediate composition. The intermediate composition is gel extruded to form the compostable polymeric material. In an embodiment, a compostable polymeric material is formed by a method comprising the recited steps.

Home compostable stretched film comprising at least one polymer composition layer A wherein polymer composition A comprises 15 to 85 wt.-%, based on the total weight of the polylactic acid a) and the aliphatic-aromatic biodegradable polyester b), of at least one polylactic acid a) and 15 to 95 wt.-%, based on the total weight of the polylactic acid a) and the aliphatic-aromatic biodegradable polyester b), of at least one biodegradable aliphatic-aromatic polyester.

The invention discloses a high-strength self-lubricating three-layer nested medicine-carrying hollow cervical cerclage band with an auxiliary miscarriage prevention function and a preparation method of the cerclage band, and belongs to the technical field of medical instruments. Degradable polyester monofilaments are woven into a hollow round rope, and the hollow round rope and a medical curved needle are integrated; then carrying out polydopamine-polyethylene glycol double-layer modification on a copper-based metal organic framework (Cu-MOF), and loading active molecules; then mixing the drug-loaded Cu-MOF with collagen natural polymer sol, and uniformly filling the gel into the inner cavity of the round rope and forming a three-dimensional bracket through synchronous drawing type micro-perfusion and light-enzyme synergistic cross-linking; then constructing a transient hydrated lubricating layer on the surface; and finally carrying out ethylene oxide final sterilization to obtain a finished product. The cervical cerclage band device provided by the invention simultaneously provides degradable mechanical support, collagen scaffold induction and long-acting slow release regulation, has a low-friction implantation characteristic, and can be well used for preventing or treating middle and late abortion and premature delivery caused by cervical insufficiency.

This invention provides a biodegradable microsphere, its preparation method, and its application. The biodegradable microsphere comprises a porous microsphere with a continuous internal pore structure and a gelatin component loaded on the porous microsphere. The biodegradable polyester microspheres prepared by this invention using a thermally induced phase separation-crystallization method have an excellent interconnected porous structure. The microspheres formed by combining with gelatin biomacromolecules can provide an excellent adhesion and survival environment for cells.

The invention discloses a biodegradable polyester composition with controllable degradation time and a preparation method of the biodegradable polyester composition, and relates to the technical field of biodegradable materials. 20-40 parts by weight of carboxyl-terminated polylactic acid; 0.5 to 3.0 parts by weight of a bifunctional chain extender containing an acetal bond; 5 to 15 parts by weight of a polyethylene glycol-b-polycaprolactone block copolymer; 1-5 parts by weight of modified cellulose nanocrystals; and 0.1-0.5 part by weight of metal organic framework loaded lipase. By reasonably matching the components and optimizing the preparation process, the degradation time of the biodegradable polyester composition can be accurately controlled, and the degradation induction period and the complete degradation time can be adjusted as required. The compatibility of the components is good, the mechanical property and the processing stability of the material can be effectively improved, and the problem of inactivation or uneven dispersion of the components in the processing process is avoided.

The invention provides a biodegradable polyester composite material containing tannic acid-aluminum coordination modified bamboo fibers, and relates to the technical field of composite materials. The biodegradable polyester composite material containing the tannic acid-aluminum coordination modified bamboo fiber is prepared from the following raw material components in parts by weight: 100 parts of biodegradable polyester, 1 to 30 parts of modified bamboo fiber and 0.3 to 2 parts of compatilizer, the modified bamboo fibers are tannic acid-aluminum coordination modified bamboo fibers; the compatilizer is polyester type polyurethane of which the side chain is chemically bonded with an epoxy group. According to the invention, the modified bamboo fiber and the compatilizer are added into the biodegradable polyester, so that the biodegradable polyester composite material with better mechanical properties can be obtained.

The invention provides a biodegradable alloy and a preparation method and application thereof, raw materials of the biodegradable alloy comprise a biodegradable resin base material and an auxiliary agent, the biodegradable resin base material comprises biodegradable polyester resin and carbon dioxide-based biodegradable resin, the auxiliary agent comprises carbon dioxide-based biodegradable resin grafted maleic anhydride, the weight-average molecular weight of the carbon dioxide-based biodegradable resin is 150000-600000, and the terminal hydroxyl value is less than or equal to 10 mol / t; the carbon dioxide-based biodegradable resin grafted maleic anhydride with specific molecular weight and terminal hydroxyl value is added as a compatilizer in the preparation process, so that the compatibility of the biodegradable polyester resin and the carbon dioxide-based biodegradable resin is effectively improved; and the finally obtained biodegradable alloy has excellent gas barrier property and mechanical property.

The present invention provides a biodegradable polyester resin composition, a method for preparing the same, and a biodegradable polyester film prepared from the same, the composition comprising a resin including a residue of a dicarboxylic acid component and a residue of a diol component, and satisfying formula 1. By satisfying Formula 1, the productivity and processability of the biodegradable polyester resin composition are improved, thereby enhancing the tensile strength, elongation, and tear strength of the biodegradable polyester film. [Formula 1]: In Formula 1, G'is the storage modulus at a temperature of 190 DEG C and a frequency of 10 radian / sec to 100 radian / sec in dynamic viscoelasticity measurement, and G ''is the loss modulus at a temperature of 190 DEG C and a frequency of 10 radian / sec to 100 radian / sec in dynamic viscoelasticity measurement.

This invention provides a method for preparing PBAT polyester, a biodegradable PBAT material, and the same method. The PBAT polyester of this application incorporates a small amount of NH2-PEG2-CH2COOH into the synthesis reaction, which improves its elongation at break, especially under high-speed blown film conditions. The biodegradable polyester composition of this invention is used to prepare shopping bags, milk tea bags, etc., and maintains good mechanical properties even during high-speed production, i.e., high-speed blown film conditions, thus playing a positive role in improving production efficiency across the entire industry.

This invention relates to the field of polyester materials technology, and discloses a flame-retardant biodegradable polyester material and its preparation method. The polyester material of this invention is composed of 65-80 parts by weight of aromatic polyester, 20-35 parts by weight of aliphatic polyester, and 5-25 parts by weight of polylactic acid-based flame retardant. The aromatic polyester is selected from polyethylene terephthalate (PET), and the aliphatic polyester includes biodegradable components such as polylactic acid (PLA). The PLA-based flame retardant of this invention improves the compatibility between aliphatic polyesters such as PLA and aromatic polyesters such as PET, resulting in better mechanical properties. Simultaneously, the main chain contains a large number of phosphoramide groups, forming a nitrogen-phosphorus flame-retardant system, thereby improving the flame-retardant performance of the polyester material.

The invention discloses a preparation method of a biodegradable synergistic benzotriazole light stabilizer, and belongs to the technical field of high polymer material additives. The method comprises the following three steps: a) carrying out pre-activation reaction on a benzotriazole derivative and anhydride; b) carrying out catalytic grafting reaction on the pre-activated product and hydroxyl-terminated polyester (such as polycaprolactone glycol and polylactic acid glycol, and the number-average molecular weight is 1500-5000); c) carrying out mechanochemical compounding on the grafted product and plant polyphenols (such as tannic acid, quercetin and gallic acid) in a mass ratio of (8-12): 1; through chemical grafting of the benzotriazole light stabilizer and the biodegradable polyester and synergistic compounding of the benzotriazole light stabilizer and the plant polyphenol, the biodegradability and the synergistic effect of the light stabilizer are achieved, and the light stabilizer can be applied to ultraviolet protection of biodegradable plastics and has the advantages of being environmentally friendly and efficient.

The invention relates to biodegradable intranasal system for the sustained-release of fluticasone propionate in the intranasal cavity, said system comprising a biodegradable polyester matrix that comprises the fluticasone propionate as the active ingredient to be released in the intranasal cavity, wherein the polyester is selected from the list of poly(L,D-lactic acid) (PLA), poly(caprolactone) (PCL), their copolymers such as PLA-PCL, and mixtures thereof; and a method for preparing said system. The invention also relates to a kit comprising the system of the invention and the means of insertion of the system into the nasal cavity. The invention further relates to fluticasone propionate for use for treating chronic rhinitis or chronic sinusitis, wherein the fluticasone propionate is in a form suitable for administration in the nasal cavity by means of the biodegradable intranasal system of the invention.