50 results about "Biodegradable polyester" patented technology

The present invention provides a biodegradable polyester which can be used as dispersant for agricultural formulations. In addition, the present invention further provide an agricultural composition comprising the same.

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.

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.

The present invention relates to: a biodegradable aliphatic / aromatic polyester having a high content of aromatic dicarboxylic acid; and a preparation method therefor and, more specifically, to a biodegradable aliphatic / aromatic polyester and a preparation method therefor, the biodegradable aliphatic / aromatic polyester comprising, in specific amounts, an aliphatic dicarboxylic acid, an aromatic dicarboxylic acid, and an aliphatic diol compound having a chain length of less than 4 carbon atoms, thereby having excellent biodegradability and crystalline properties.

The application provides a high-barrier PBAT-based biodegradable film and a preparation method thereof. The preparation method comprises the following steps: melt blending a powdered high-barrier biodegradable polyester and PBAT to obtain a blend and performing film blowing to obtain the high-barrier PBAT-based biodegradable film; wherein the temperature of melt blending is lower than the melting temperature of the high-barrier biodegradable polyester and higher than the melting temperature of the PBAT; during the film blowing process, the temperature of the melt conveying zone is lower than the melting temperature of the high-barrier biodegradable polyester and higher than the melting temperature of the PBAT; and the temperature of the die lip zone is higher than the melting temperature of the high-barrier biodegradable polyester. The preparation method can prepare the PBAT-based biodegradable film with good barrier performance under the condition of a lower content of the high-barrier biodegradable polyester.

The present invention relates to a biodegradable composition having low casting precipitation, and a preparation method therefor and the use thereof. The biodegradable composition having low casting precipitation comprises the following components in parts by weight: 69-91 parts of polylactic acid, 0-16 parts of a flexible biodegradable polyester, 0-11 parts of a filler, 0.1-3.1 parts of an anti-precipitation agent, and 0.1-3.1 parts of a phosphite antioxidant. In the present invention, the anti-precipitation agent and phosphite antioxidant are added to the biodegradable composition comprising polylactic acid as a main component, thereby effectively improving the casting precipitation problem of the biodegradable composition.

This invention relates to an injectable hydrogel, its preparation method, and its applications. The composite gel comprises biodegradable polyester microspheres containing milk exosomes that provide nutrients. A cross-linked hyaluronic acid gel is prepared by cross-linking hyaluronic acid, DMTMM, and L-lysine ethyl ester dihydrochloride. PLLA microspheres containing milk exosomes are then added and mixed to form the injectable hydrogel. This composite gel possesses ideal mechanical properties, and its degradation rate meets the requirements for injectable fillers. The PLLA microspheres are loaded with active nutrients, providing a slow, long-term release, while the gel provides short-term release and injection performance, achieving a short-term plus long-term repair effect. The bioactive function of milk exosomes, the collagen regeneration function of PLLA microspheres, and the immediate filling function of hyaluronic acid gel are organically integrated into the same system, enabling immediate filling, long-term regeneration, and bioactive regulation.

The present invention relates to a polyester composition, and a preparation method therefor and the use thereof. The polyester composition comprises the following components in parts by weight: 40-91 parts of a biodegradable polyester, 2-20 parts of polylactic acid, 1-30 parts of calcium carbonate, 0.1-10 parts of a flaky inorganic filler, and 0.1-2 parts of an organic anti-blocking agent. A film bag prepared from the polyester composition of the present invention by means of a high-speed ultrathin film blowing technique has good resistance to "the blocking of die-cut openings' and dart drop impact.

This application provides a polyhydroxyalkanoate microsphere and its preparation method. The polyhydroxyalkanoate comprises a copolyester of 3-hydroxybutyric acid and 4-hydroxybutyric acid, wherein the molecular weight of the 3-hydroxybutyric acid and 4-hydroxybutyric acid copolyester is 50 kDa to 150 kDa. The microspheres have a smooth surface and a particle size distribution ≤ 0.65, wherein the particle size distribution = (D... 90 -D 10 ) / D 50 The polyhydroxyalkanoate microspheres of this application have a smooth surface and uniform particle size distribution, making the injection process smoother. The method of this application can precisely control the surface morphology of biodegradable polyester microspheres, meeting the diverse needs of the medical aesthetics field for microsphere surface morphology.

The application relates to the field of straw technology, in particular to a low-temperature-resistant crystallization straw and a preparation method thereof, the low-temperature-resistant crystallization straw comprises the following components in parts by weight: PLA, 5-15 parts of PBS, 5-10 parts of PBAT, 1-35 parts of inorganic mineral powder, 0.1-0.6 parts of an alcoholysis agent, 1-3 parts of a compatilizer, 0.1-0.5 parts of an antioxidant and 0.1-1 parts of a nucleating agent; the compatilizer is a biodegradable polyester containing an epoxy functional group. The brittleness of PLA is offset by the introduction of PBA and PBAT, then the PLA is cut and the short-chain end of the PLA rich in hydroxyl and carboxyl is formed by adding the alcoholysis agent, the epoxy group of the compatilizer is opened, the originally incompatible PLA phase and the PBA / PBAT phase are chemically bonded, finally the crystallization rate and the crystallinity of the PLA are improved by the cooperation between the nucleating agent and the inorganic mineral powder, the low-temperature resistance of the crystallization straw is effectively improved, and the raw materials of the application are various degradable materials, which are helpful to realize the degradability of the low-temperature-resistant crystallization straw.

Disclosed are biodegradable polyester polymers comprising lignin-containing segments and vegetable-oil based segments. Also disclosed herein are methods of making biodegradable polyester polymers and the articles made from these polymers.

The present invention provides a biodegradable polyester which can be used as dispersant or stabilizer for agricultural formulations. In addition, the present invention further provides an agricultural composition comprising the same.

This invention discloses a bio-based high-barrier biodegradable packaging material and its preparation method, belonging to the field of polymer materials technology. The material comprises the following formulation: polylactic acid, polybutylene adipate / terephthalate, starch, nano-clay, polyvinyl alcohol, glycerin, plant wax, compatibilizer, antioxidant, and lubricant. This invention introduces nanofillers, polyvinyl alcohol, and plant wax into a continuous phase system composed of polylactic acid and flexible biodegradable polyester to construct a multi-level synergistic structure. Simultaneously, a compatibilizer is used to regulate the interfacial bonding state of the multiphase components, enabling each component to form a stable and continuous structural distribution at the microscale. This effectively extends the gas diffusion path, reduces the water vapor permeation rate, and balances the mechanical properties and processing stability of the material without introducing complex functionalized components, thus comprehensively improving the overall barrier performance and practical application adaptability of the bio-based packaging material.

This invention discloses a density-adjustable biodegradable temporary plugging material raw material composition, the biodegradable temporary plugging material itself, its preparation method, and its applications. The density-adjustable biodegradable temporary plugging material raw material composition of this invention comprises 100 parts by weight of polyglycolic acid (PGA); 0.1-60 parts by weight of a second aliphatic polyester; 0.1-60 parts by weight of an amorphous ester polymer; 0.1-10 parts by weight of a water-soluble polymer; and 0.01-2 parts by weight of a free radical initiator. This invention effectively reduces the density of PGA by introducing low-density aliphatic polyester and amorphous polymer. The introduction of the water-soluble polymer constructs a water molecule diffusion pathway, increasing the diffusion rate of water molecules within the material and accelerating the degradation of polyester molecules. Simultaneously, the peroxide can also induce coupling between the polyglycolic acid and the second aliphatic polyester molecular chains, improving the stability of the biodegradable polyester during thermoplastic processing. The density-adjustable biodegradable temporary plugging material prepared by this invention exhibits stable processing, meets mechanical property requirements, and achieves reduced material density and accelerated degradation, resulting in good technical effects.

This invention provides an aliphatic polyester, a polyester composition comprising the same, and their applications, belonging to the technical field of biodegradable polyester materials. The aliphatic polyester comprises diacid residues and diol residues: the diacid residues include the following residues: a1), 61.2–69.1 mol% succinic acid residues based on a1) and a2), based on a total molar percentage of 100 mol% of a1) and a2), and a2), 30.9–38.8 mol% sebacic acid residues based on a1) and a2), based on a total molar percentage of 100 mol% of a1); the diol residues are selected from 1,4-butanediol residues in at least an equimolar amount as the diacid residues; the mass percentage of oligomers with a number average molecular weight <650 in the aliphatic polyester is 1.09–3%; and the molecular weight distribution coefficient of the aliphatic polyester is 1.72–2.83. The aliphatic polyester exhibits good high-speed blown film forming performance, retains excellent opening performance after high-speed blown film forming, and also possesses excellent puncture resistance.

This invention discloses a fully biodegradable PBAT masterbatch reinforced with a three-dimensional bamboo microfiber network. The masterbatch consists of a silane-epoxy dual-modified bamboo microfiber three-dimensional network reinforcing phase and a PBAT matrix phase, prepared via a three-step method of "steam explosion-high-speed shearing-in-situ self-assembly." The silane coupling agent and epoxy chain extender work synergistically to form covalent bonds on the surface of the bamboo microfibers, simultaneously inducing the bamboo microfibers to self-assemble into a continuous three-dimensional network structure during the melting process. The masterbatch exhibits a tensile strength of 28.5-35.2 MPa, an elastic modulus of 320-410 MPa, an elongation at break of 420-580%, and a water vapor permeability reduction of 35-45%. This invention solves the technical problems of weak interfacial bonding, limited improvement in mechanical properties, and easy agglomeration of bamboo fibers in traditional bamboo powder / PBAT composites. The preparation process is simple, can be mass-produced, and is suitable for applications such as agricultural films, packaging films, and disposable tableware.

The application discloses a photochromic multi-component copolyester, a photochromic biodegradable polyester film and preparation and application thereof. The copolyester comprises a first repeating unit shown in formula (I) and a second repeating unit shown in formula (II); the molar ratio of the first repeating unit to the second repeating unit is (5-95):(95-5). The application introduces a diaryethene photochromic structural unit and a polylactone segment into a polyester molecular main chain, can synthesize a block or random copolymer as required, cooperatively gives the polyester intrinsic photochromic characteristics and biodegradability, and can precisely control the mechanical properties and degradation rate of the material. The application also provides a photochromic biodegradable polyester film prepared from the polyester, the film has adjustable mechanical properties, fast and stable light response, excellent film-forming property, can realize reversible photochromism and controllable degradation.

This invention relates to the field of polyester fiber preparation technology, specifically to a biodegradable polyester fiber and its preparation method. The biodegradable polyester fiber, by weight, comprises the following raw materials: 25-35 parts polyester, 60-70 parts polylactic acid, 3-8 parts chain extender, 1-3 parts UV stabilizer, 1-3 parts antibacterial agent, 2-4 parts compatibilizer, 0.5-1 part plasticizer, 0.5-1 part lubricant, 0.05-0.1 part nucleating agent, and 0.1-1 part antioxidant. The biodegradable polyester fiber disclosed in this invention possesses good mechanical properties and good degradability.

The present disclosure generally relates to a waterproofing polymer that is a reaction product of the following components: (i) at least one polyglycerol; (ii) at least one dimer acid; and (iii) at least one fatty acid having 8-30 carbon atoms, wherein (iii) and (i) are in a molar ratio of less than 2:1. The components are charged to a reaction vessel and subsequently reacted to produce a polyester polymer having excellent waterproofing properties. The polymers impart high static and water-resistant SPF to water-in-oil sunscreen formulations.

Through a transesterification reaction in which a predetermined amount of bis(2-hydroxyethyl)terephthalate relative to glycol is fed in a divided or continuous manner, bis(glycol)terephthalate with a low residual amount of an ethylene glycol derivative is prepared, and polyester engineering products or biodegradable polyester products with high crystallinity can be produced therefrom.

This invention relates to the field of biodegradable polymer materials technology, specifically to a method for preparing bio-based biodegradable polyester, which is obtained by esterification and polycondensation reaction of bio-based diacid, bio-based diol, bio-based catalyst and antioxidant; the bio-based diacid is bio-fermented succinic acid, or a mixture of succinic acid and itaconic acid in a molar ratio of 8:2; the bio-based diol is a mixture of 1,3-propanediol and isosorbide, or a mixture of 1,3-propanediol, isosorbide and 1,4-butanediol in a molar ratio of 4:3:3; the bio-based catalyst is a guanidine carboxylate zinc complex or a zinc glutamate complex; this invention uses a fully bio-based raw material system to construct biodegradable polyester, with all raw materials derived from bio-fermentation and natural biomass conversion, realizing the renewability and environmental friendliness of the material from the source, which is in line with the development trend of green materials.

The application discloses a full-natural-field degradable material and a preparation method and application thereof. The full-natural-field degradable material comprises the following raw materials in parts by weight: biodegradable polyester 50-96 parts; biological enzyme 2-20 parts; degradation aid 2-20 parts; and inorganic filler 0-10 parts. Through reasonable formula collocation, the material can be degraded by more than 90% in the full natural field within 1-8 months, effectively overcoming the plastic pollution problem caused by the slow degradation or even non-degradation of traditional plastics and biodegradable polyester materials in the natural environment. Meanwhile, the material can be used for more than one year at room temperature and low humidity, and can replace the traditional difficult-to-degrade plastics such as polyethylene, polyethylene terephthalate, polyamide and polypropylene to be applied to the preparation of biodegradable products.

This invention belongs to the technical field of biodegradable polyester materials for cosmetic plastic shells, and discloses a biodegradable and environmentally friendly polyester material for cosmetic plastic shells and its preparation method. Using a blend of polylactic acid and polybutylene adipate terephthalate as the matrix, silane coupling agent-grafted modified nano-chitosan fibers, modified rare earth cerium-based supported nano-titanium dioxide powder prepared by cerium-aluminum co-precipitation, and matching additives are added. The finished product is obtained by melt blending and injection molding. After immersion in 30% ethanol cosmetic simulation solution for 48 hours, the tensile strength retention rate of the material is not less than 75%, meeting the safety requirements for cosmetic contact. This invention effectively improves the resistance of biodegradable polyester to cosmetic solvent erosion, balances ultraviolet shielding and high visible light transmittance, has a low risk of filler exudation, high injection molding precision, and good appearance yield, and is suitable for the production and use needs of various cosmetic packaging.

The application discloses a kind of biodegradable synthetic resin and preparation method thereof, the biodegradable synthetic resin includes the following weight parts raw materials: hydroxyl-terminated biodegradable polyester elastomer 10-30 parts, modified polybutylene succinate 60-80 parts, polyglycolide resin 15-30 parts, compatibility agent 5-10 parts, antioxidant 0.1-1 part and lubricant 0.1-1 part.The raw materials of biodegradable synthetic resin used in the application are all full biodegradable materials, not only widely available, but also can complete biodegradation, it is an environment-friendly synthetic resin;The biodegradable synthetic resin of the application has good mechanical comprehensive performance and high thermal decomposition temperature.

This invention provides biodegradable polyester resins, biodegradable polyester resin compositions, and molded articles thereof that have excellent biodegradability and excellent hydrolysis resistance. These biodegradable polyester resins, biodegradable polyester resin compositions, and molded articles thereof contain structural units derived from a dicarboxylic acid component (A) and structural units derived from an aliphatic diol component (B), and satisfy at least one of the following conditions (α) and (β). • Condition (α): The dicarboxylic acid component (A) contains a first dicarboxylic acid component (A1) composed of at least one compound selected from the group consisting of aliphatic dicarboxylic acids (a1) and their derivatives as shown in Formula (I). • Condition (β): The aliphatic diol component (B) contains a first aliphatic diol (B1) composed of at least one compound selected from the group consisting of aliphatic diols (b1) as shown in Formula (II). [The symbols in Formulas (I) and (II) are as defined in this application specification.]

An embodiment provides a biodegradable polyester resin composition comprising: a polyester resin comprising a diol, an aromatic dicarboxylic acid, and an aliphatic dicarboxylic acid; and a fiber-based reinforcing material, wherein a first turbidity change rate of the fiber-based reinforcing material is less than 15%, thereby achieving improved physical properties.

The application discloses a time sequence control type composite pollution repair material for facility agriculture soil and a preparation method and application thereof, and belongs to the technical field of soil repair. The repair material is a three-layer core-shell structure particle, which comprises, from inside to outside, an inner core layer composed of biodegradable polyester wrapping pesticide degrading enzyme and pesticide adsorbent, a middle layer composed of water / ion responsive hydrogel wrapping heavy metal fixing agent and oxidative degradation catalyst, and an outer shell layer composed of brittle degradable polymer wrapping micro / nano plastic surface capping agent. The repair material realizes time sequence and synergistic repair of micro / nano plastic, available Cd and malathion by triggering the release of the outer shell layer through plowing mechanical force, triggering the slow release of the middle layer through irrigation water response, and triggering the release of the inner core layer through rhizosphere microbial enzyme. The material has simple preparation process, convenient application and good application prospect.

This invention solves the problem of providing a polymer that can be used as a tire material and is easily degradable. The solution provided by this invention is a copolymer characterized by comprising segments (A) derived from a butadiene-based polymer, segments (B) derived from a biodegradable polyester, segments (C) derived from polyethylene glycol, and segments (D) derived from a polyisocyanate compound. Preferably, the copolymer further comprises segments (E) derived from a diol compound with a molecular weight of 600 or less, in addition to the segments (A), (B), (C), and (D) derived from the butadiene-based polymer, the biodegradable polyester, and the polyisocyanate compound.