695 results about "Caprolactone" patented technology

The invention discloses an absorbable suture line for surgical suture and a preparation method thereof, and relates to the technical field of medical materials. The absorbable suture line for surgical suture is prepared from the following raw materials in parts by weight: 50 to 65 parts of polylactic acid, 15 to 20 parts of polyglycolic acid, 3 to 5 parts of sodium carboxymethyl cellulose, 3 to 8 parts of a toughening agent, 3 to 6 parts of an antibacterial agent, 0.3 to 0.8 part of a lubricating agent, 1 to 2 parts of sodium hyaluronate and 5 to 10 parts of polyvinyl alcohol. The toughening agent is obtained by reacting hydroxyethyl acrylate with ethylenediamine to generate a four-arm compound and then reacting with 6-caprolactone and DL-lactide. The absorbable suture line for surgical suture prepared by the invention has excellent tensile property and antibacterial property, and can meet the application requirements of clinical medical treatment.

The invention discloses a Janus wound dressing with antibacterial and tissue repair promoting functions and a preparation method of the Janus wound dressing, belongs to the technical field of wound dressings, and aims to realize antibacterial, tissue repair promoting and moist wound healing microenvironment through freeze drying and electrostatic spinning technologies. Polycaprolactone (PCL), bioactive glass (BG) and curcumin Cur are used for preparing a hydrophobic inner layer capable of promoting tissue repair, methacrylated gelatin GelMA is used for preparing a hydrophilic outer layer with moisturizing performance, and the PCL-BG-Cur / GelMA composite wound dressing with antibacterial, moisturizing and repair promoting functions is constructed. Animal experiment results show that the dressing loaded with curcumin Cur and bioactive glass BG has multiple functions of synergistic antibiosis, moisturizing and the like, the result shows that the prepared dressing has the performance of promoting epithelization, collagen deposition, new hair follicle formation and the like, and the dressing has a considerable application prospect in the aspect of rapid wound repair.

The invention discloses a biodegradable polylactic acid composite material and a preparation method thereof, and relates to the technical field of polylactic acid materials. The method comprises the steps that firstly, chitosan activated through hydrochloric acid is subjected to graft modification through a KH550 silane coupling agent, meanwhile, nano-zinc oxide is subjected to surface modification through stearic acid, the chitosan and the nano-zinc oxide are mixed, spray drying is conducted, and antibacterial composite powder is prepared; the preparation method comprises the following steps: performing hydrochloric acid activation and KH570 silane coupling agent modification on nano silicon dioxide, performing hydroxypropylation modification on alkali lignin, and performing reflux crosslinking reaction on the modified alkali lignin, KH570 modified nano silicon dioxide, polycaprolactone, methyl methacrylate and azodiisobutyronitrile to prepare a heat-resistant reinforcer; uniformly mixing polylactic acid, poly (butylene succinate), the antibacterial composite powder, the heat-resistant reinforcer, tributyl citrate, polyethylene glycol and talcum powder, and extruding and granulating by using a twin-screw extruder to obtain the heat-resistant antibacterial material. The composite material prepared by the invention has excellent antibacterial property, heat resistance and biodegradability.

The invention discloses a quick-curing polyurethane seamless expansion joint material for roads and a preparation method, and belongs to the technical field of road engineering materials. The material is prepared from polyether polyol, polycaprolactone glycol, a bisphenol A epoxy-polyether block isocyanate terminated prepolymer, a methyl phenyl silicon-boron hybrid hydroxyl chain extender, diphenylmethane diisocyanate, calcium carbonate, wollastonite, a hindered amine anti-aging agent and dioctyl phthalate. Wherein the bisphenol A epoxy-polyether block isocyanate terminated prepolymer is prepared by the following steps: reacting bisphenol A with epoxy chloropropane to generate epoxy resin, reacting with polytetramethylene ether glycol, and introducing isophorone diisocyanate; the methyl phenyl silicon-boron hybrid hydroxyl chain extender is prepared by carrying out hydrosilylation and ethylene glycol reaction on methyl trimethoxy silane, 3-glycidyl ether oxypropyl trimethoxy silane and allylboronic acid pinacol ester; and the methyl phenyl silicon-boron hybrid hydroxyl chain extender is prepared by carrying out hydrosilylation on methyl trimethoxy silane, 3-glycidyl ether oxypropyl trimethoxy silane and allylboronic acid pinacol ester. The material has the advantages of quick curing property, weather resistance and high-temperature stability, and is suitable for road seamless expansion joint scenes.

The invention discloses a degradable resin material, an optical property regulator, an optically-adjustable environment-friendly mulching film and a processing method of the optically-adjustable environment-friendly mulching film, and belongs to the field of degradable environment-friendly materials. The invention provides a degradable polyester resin material with a novel structure, namely polycaprolactone-co-lactide. The degradable polyester resin material is formed by performing ring-opening copolymerization on epsilon-caprolactone and lactide under the catalytic action of a symmetric binuclear Schiff base complex; the ratio of the average chain segment length of caprolactone to the average chain segment length of lactide in the resin material is (2-2.2): (2-2.2), which is close to that of an alternating copolymer. The compound can be used as an optical property regulator, and preparation of an environment-friendly mulching film with adjustable optical properties such as ultraviolet light absorbance, infrared light transmittance and haze can be realized under the condition that no dye or other coloring additives are used.

The invention relates to the technical field of polymer compositions, and particularly discloses a degradable bio-based food packaging material and a preparation method thereof.The degradable bio-based food packaging material is prepared from polylactic acid, ITA esterified bacterial cellulose, CSL-ITA esterified bacterial cellulose, polycaprolactone glycol, acetyl tributyl citrate, a photoinitiator and tocopherol; the preparation method comprises the following steps: esterifying bacterial cellulose hydrogel with itaconic anhydride, grafting with sodium copper chlorophyllin, dehydrating with gradient ethanol, and drying with supercritical CO2 to obtain modified powder; according to the preparation method, the interfacial compatibility of the bacterial cellulose and the polylactic acid is enhanced through ITA esterification, the illumination antibacterial function is given by utilizing CSL grafting, the polycaprolactone glycol and the acetyl tributyl citrate are synergistically used for toughening and improving the brittleness, the photoinitiator is added, the photoinitiator is added for mixing, and ultraviolet crosslinking curing is performed after film forming. The tocopherol protects the stability of the antibacterial structure of the CSL, the water resistance is improved through photo-crosslinking, and the material is degradable and meets the food packaging requirement.

The invention relates to the technical field of polymer composite materials, in particular to a polycaprolactone-based composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out surface grafting treatment on nano cellulose to obtain modified nano cellulose; mixing the modified nanocellulose, polycaprolactone and a solvent to obtain slurry; carrying out melt blending and granulation on the slurry to obtain composite granules; and carrying out melt blending and granulation on the composite granules, a metal soap stabilizer and a natural resin derivative to obtain the polycaprolactone-based composite material. The polycaprolactone-based composite material prepared by a novel composite process of nano cellulose graft modification-solvent replacement synergetic melt co-extrusion has the core advantages of high mechanical strength, excellent light transmittance, long-acting weather resistance and the like, is good in processing adaptability and simple and convenient to operate, can realize continuous large-scale production, and remarkably reduces energy consumption and raw material cost.

The invention discloses a preparation method of a polymer vesicle capable of crossing a blood brain barrier, and belongs to the field of high polymer materials and medical engineering. The preparation method of the polymer vesicle capable of crossing the blood brain barrier comprises the following steps: synthesizing an amphiphilic block copolymer by utilizing ring-opening polymerization reaction of polycaprolactone and anhydride in an amino acid ring, then assembling the polymer into the polymer vesicle, and modifying a monoclonal antibody of a transferrin receptor on a polypeptide chain. The polymer vesicle prepared by the invention is simple and convenient in preparation process, short in period, good in stability, good in biocompatibility and good in biodegradability, can be used as an excellent carrier of chemotherapeutic drugs, and can effectively realize drug delivery of targeting brain tumor cells across a blood brain barrier. Compared with a commercial drug delivery carrier, the polymer vesicle has the advantage that the permeability of the drug in a bionic blood brain barrier and the targeted uptake rate of brain tumor cells are remarkably improved.

The present invention belongs to the technical field of oils for hydraulic supports and provides a biodegradable natural plant-extracted emulsified oil for hydraulic supports and a preparation method thereof. First, through multi-step chemical modification of palm oil, including epoxidation, boronation, phosphating, and block polymerization, the epoxidation reaction introduces epoxy groups, increasing the reactivity of the oil; the boronation and phosphating reactions further enhance the polarity of the oil and its ability to form a lubricating film; and through block polymerization with caprolactone, the stability and wear resistance of the lubricating film are enhanced. Second, through carboxymethylation of chitosan, the carboxyl groups in the carboxymethyl chitosan react with oxides on the metal surface to form a chemical passivation protective film; and the sulfonic acid groups in the sodium lignosulfonate bind to the metal surface through electrostatic adsorption, further forming a protective layer. The synergistic effect of the two forms a multi-layer dense protective film on the metal surface, significantly improving the anti-corrosion performance of the emulsified oil.

The invention relates to the technical field of sewage treatment, in particular to a preparation method of a degradable bactericide for an oil field. According to the invention, a hydroxypropyl guanidine gum-polycaprolactone-ethylenediamine fragment copolymer is taken as a carrier, a methylisothiazolinone quaternary ammonium salt (Q-MIT) bactericide is loaded, and the degradable bactericide for the oil field is obtained by cooperating with a dodecyl ethyl sulfide (TC-SE) bactericide and combining with sodium polyaspartate. A carrier forms a hydrogen bond with a polar group on the surface of a biological membrane through a hydroxypropyl guanidine gum main chain to realize targeted anchoring, a polycaprolactone branched chain encapsulates Q-MIT through a hydrophobic effect, primary amino groups of ethylenediamine are introduced to form a pH sensitive Schiff base bond with Q-MIT, and the primary amino groups and adipic dihydrazide form a thermal response hydrazide bond to construct a dual dynamic covalent bond, so that controlled release of Q-MIT is realized, and the biomembrane is prepared. And moreover, the components of the whole system are connected through degradable chemical bonds, so that the environmental protection property and sustainability of oil field operation are guaranteed.

The present invention relates to the technical field of cyclohexanone catalytic oxidation, and specifically to a titanium silicalite molecular sieve and a preparation method thereof, a method for preparing cyclohexanone oxime, and a method for preparing caprolactone. The method comprises: (1) uniformly mixing a silicon source, an alkaline template, a titanium source, and water to obtain a titanium silicalite sol; and (2) adding a silanization agent to the titanium silicalite sol, and hydrothermally crystallizing and calcining the obtained mixture. The present invention treats the titanium silicalite sol precursor with a specific silanization agent to prepare a titanium silicalite molecular sieve. When used in the catalytic oxidation of cyclohexanone and the ammoximation reaction of cyclohexanone, the titanium silicalite molecular sieve has high catalytic activity, and the conversion rate of cyclohexanone can be increased to above 91%.

The invention provides a preparation method of an acoustic / photosensitizer-manganese dioxide nanoparticle and a product thereof. According to the method, firstly, a potassium permanganate reduction method is adopted to precisely synthesize the high-purity MnO2 nano-substrate, and according to the method, the size uniformity and dispersion stability of nano-particles can be precisely controlled by regulating and controlling the pH value and temperature of a reaction system and the concentration of a reducing agent. On the basis, amphiphilic high-molecular polyethylene glycol-polycaprolactone (PEG-PCL) is modified on the surface of the MnO2 nanometre. The whole preparation process is green and mild, and complex equipment is not needed; the reaction conditions are mild, nanoparticles are uniform, and the acoustic / photosensitizer can be combined and applied to an imaging technology to realize real-time monitoring.

The invention discloses a modified polylactic acid high-temperature-resistant degradable composite material and a preparation method thereof, and relates to the technical field of degradable materials. The modified polylactic acid high-temperature-resistant degradable composite material at least comprises the following raw materials in parts by mass: 70-80 parts of polylactic acid; 15 to 25 parts by mass of a lignin-polylactic acid-polycaprolactone block copolymer; 5 to 10 parts by mass of poly (butylene adipate-co-terephthalate); 2-5 parts by mass of stearic acid modified nano silicon dioxide; 0.3 to 0.8 part by mass of an anti-hydrolysis agent; and 0.2 to 0.5 part by mass of an antioxidant. According to the prepared modified polylactic acid high-temperature-resistant degradable composite material, the mechanical property and the high temperature resistance of the polylactic acid composite material are improved, the degradation rate can be regulated and controlled through the proportion of all the components, and the use requirements of different scenes are met.

The present invention belongs to the technical field of petrochemical catalysis, and relates to a preparation method for improving the stability of a Cu-Beta zeolite catalyst for preparing caprolactam from caprolactone, and the use thereof. In the present invention, a cavity-modified dealuminated Beta zeolite is used as a carrier, and copper is loaded in pore channels of the zeolite carrier by means of an improved ammonia distillation method. The cavity modification refers to subjecting the dealuminated Beta zeolite carrier to a desiliconization technique controlled by the use of a weak organic base so as to enlarge silanol nests generated by dealumination of the dealuminated Beta zeolite carrier, thereby better accommodating and stabilizing the nano and sub-nano copper particles. The core of the improved ammonia distillation method involves impregnating a zeolite carrier with an equal volume of a copper-ammonia complex solution, such that the copper-ammonia complex mainly undergoes, during ammonia distillation, a reaction of depositing copper hydroxide in zeolite pore channels, thereby improving the sintering resistance. The Cu-Beta catalyst prepared using the method provided by the present invention exhibits high activity, selectivity and stability when applied to the reaction of caprolactam prepared from caprolactone via gas-solid phase hydroamination.

The invention discloses a preparation method of modified thermostable polycaprolactone, and belongs to the technical field of high polymer materials. The method comprises the following steps: selecting branched monomers such as 3-methyl-epsilon-caprolactone, inhibiting molecular chain slippage through a side group steric effect, and improving chain rigidity; a super-crosslinking metalloporphyrin porous material catalyst is adopted; (3) introducing a light / heat reversible group to an end group; and (4) optimizing process conditions and narrowing molecular weight distribution. Experiments show that the modified PCL obtained by the method is high in thermal decomposition temperature, small in melt flow rate change rate, low in yellowing index and high in tensile strength, and the comprehensive performance of the modified PCL is far better than that of the modified PCL obtained by a traditional method. The material is suitable for the fields of medical instruments, intelligent packaging and the like, and has the characteristics of high thermal stability, rapid shape recovery and controllable degradation.

The application discloses a degradable cotton soft towel and a preparation method thereof, relates to the technical field of fiber composite materials, and belongs to the patent classification D01F8 / 02. The preparation method comprises the following steps: performing alkali treatment and enzymolysis on Egyptian long-staple cotton fibers to obtain pretreated cotton fibers, and preheating, stretching and setting poly-caprolactone fibers to obtain pretreated poly-caprolactone fibers; mixing and opening the two kinds of fibers, and then air-laying to form a fiber web; constructing a super water-absorbing network by impregnating a main network solution carboxymethyl chitin and oxidized cellulose nanofilament and an auxiliary network dispersion liquid calcium alginate gel microspheres and a hyaluronic acid crosslinking body; forming micron protrusions through hexagonal nickel template hot pressing, and obtaining a base by electrostatic spraying modification of nano silicon dioxide; and obtaining the cotton soft towel through vacuum drying, slitting and sterilization after spraying of an essence liquid. The cotton soft towel has excellent water absorption performance through the synergistic effect of multistage pores, a super water-absorbing network and micro-nano surface modification, and the poly-caprolactone fibers and the cotton fibers used in the cotton soft towel are mixed, and both have good biodegradability.

The invention discloses polycaprolactone dihydric alcohol containing maleimide groups and a preparation method and application thereof, and the preparation method of the polycaprolactone dihydric alcohol comprises the following steps: adding N-(2, 3-dihydroxy propyl) maleimide, caprolactone and a catalyst into a reaction container, carrying out high-temperature reaction for 12-18 hours, filtering, washing, and drying to obtain the polycaprolactone dihydric alcohol containing the maleimide groups. And cooling and discharging to obtain the polycaprolactone diol containing the maleimide group. The polycaprolactone diol containing the maleimide group is used as a raw material to prepare a polyurethane prepolymer, so that the side chain of the prepolymer is provided with the maleimide group, and then a difuran compound is introduced as a dynamic cross-linking agent to obtain the self-repairing polyurethane elastomer containing the Diels-Alder bond. Through the reversible Diels-Alder (D-A) reaction effect of the functional components, the polyurethane elastomer can be remodeled and recycled, and the polyurethane elastomer has excellent and stable mechanical properties, self-repairing efficiency and repeated self-repairing capability.

To provide an inkjet ink that enables formation of an image having excellent color developability and excellent storage stability.SOLUTION: An inkjet ink comprises a pigment, a dispersant, and water, wherein the dispersant is a copolymer of a monomer mixture comprising ω-carboxy-polycaprolactone monoacrylate, polyalkylene glycol (meth)acrylate, and a vinyl monomer comprising at least one selected from the group consisting of an aromatic group and a β-dicarbonyl group.SELECTED DRAWING: None

The invention provides a composite antifouling system coating as well as a use method and application thereof. The coating sequentially comprises a bottom layer, a copper-containing middle layer and a surface layer in the direction from near to far away from a base material, wherein the copper-containing middle layer comprises 20-30 parts of self-polishing acrylic silicon resin, 5-10 parts of lime rosin, 8-12 parts of zinc oxide, 30-50 parts of cuprous oxide, 2-3 parts of a compound antifouling agent, 0.5-1 part of a thixotropic agent and a first diluent. The surface layer is prepared from 30 to 35 parts of caprolactone and lactic acid grafted linear polyester, 5 to 10 parts of highly hydrolyzed N-(hydroxymethyl) acrylamide (NMA) modified acrylic resin, 15 to 20 parts of copper-free organic antifouling agent, 5 to 12 parts of polytetrafluoroethylene micro powder, 2 to 3 parts of dispersing agent and second diluent. The high-hydrolysis copper-free surface layer forms an isolation barrier, so that the copper-containing middle layer is prevented from being in direct contact with air, and the problem that the antifouling efficiency is reduced due to the fact that water is not discharged for a long time after coating is solved; the stable hydrolysis rate of the surface layer resin can ensure the continuous release of the organic antifouling agent, and the copper-containing intermediate layer can provide deep antifouling guarantee and synergistically realize long-acting antifouling.

The invention relates to the field of packaging materials, and particularly discloses a transparent high-barrier film and a preparation method thereof. The transparent high-barrier film comprises a matrix film and chitin nanofiber films positioned on two sides of the matrix film, the matrix film is prepared from the following raw materials in parts by weight: 50 to 80 parts of PBAT resin, 20 to 30 parts of PLA resin, 25 to 40 parts of modified poly epsilon-caprolactone, 0.5 to 1 part of compatilizer, 0.1 to 1 part of antioxidant, 15 to 25 parts of filler and 0.5 to 0.8 part of nucleating agent; the modified poly (epsilon-caprolactone) is prepared from the following raw materials in parts by weight: 80 to 100 parts of epsilon-caprolactone, 3 to 5 parts of cellulose nanofiber, 2.5 to 3 parts of halloysite aluminum-magnesium-loaded hydrotalcite, 100 to 120 parts of ionic liquid and 1 to 2 parts of catalyst. The transparent high-barrier film disclosed by the invention not only has excellent oxygen and water vapor barrier properties, mechanical properties and good biodegradability, but also has the light transmittance of 90% or above.

The invention relates to the technical field of high-performance polyester, and discloses a modified preparation method of functionalized antibacterial polyester fibers, which comprises the following steps: S1, graphene is treated by oxygen-argon mixed plasma to obtain hydroxylated graphene; s2, after hydroxylated graphene is dispersed, cerium nitrate and sodium citrate are added, and cerium-based metallized graphene is obtained; s3, carrying out a reaction on the cerium-based metallized graphene and 3-(2-aminoethylamino) propyltrimethoxysilane, so as to obtain aminated graphene; s4, aminated graphene dicyandiamide, ammonium chloride tetraethoxysilane and hexadecyl trimethyl ammonium bromide are subjected to a reaction, and guanidyl-meso-porous silicon-metal composite graphene is obtained; s5, reacting the product with epsilon-polylysine and polycaprolactone to obtain a modified composite antibacterial agent; s6, treating the polyester fibers with a mixed solution of alkali and a surfactant; s7, the polyester fibers react with a solution containing an antibacterial agent, tetrabutyl titanate, an initiator and a dispersing agent, and a finished product is obtained.

The invention belongs to the technical field of high polymer materials, and relates to a modified epoxy emulsion which comprises 70-80 parts of epoxy resin, 5-7 parts of an emulsifier, 0.4-0.8 part of an initiator, 60-80 parts of a mixed monomer and 180-220 parts of water. The mixed monomer is prepared from a soft and hard acrylic monomer, acrylic acid, glycidyl methacrylate, alkenyl silane modified nano silicon dioxide and caprolactone acrylate according to a specific proportion. The invention also discloses a preparation method of the modified epoxy emulsion, and in-situ grafting of nano silicon dioxide is realized by adopting a pre-emulsion step-by-step dropwise adding process. When the emulsion is applied to the three-dimensional anti-counterfeiting temperature-sensitive ink, the emulsion has a synergistic effect with expanded microspheres grafted with amino-containing benzene rings on the surfaces: epoxy groups of glycidyl methacrylate and amino groups on the surfaces of the expanded microspheres are crosslinked to form an interpenetrating network, nano silicon dioxide is dispersed in the interpenetrating network as a rigid node, and caprolactone chain segments provide network elasticity, so that the three-dimensional anti-counterfeiting temperature-sensitive ink is prepared. Therefore, the ink has high adhesive force, excellent wear resistance and weather resistance, and is particularly suitable for printing temperature change-three-dimensional double anti-counterfeiting marks.

The invention relates to the technical field of drug delivery, and discloses a multilayer drug-loaded microsphere for intraocular sustained-release therapy and a preparation process thereof.The multilayer drug-loaded microsphere comprises a core layer, a middle layer and a shell layer, the core layer is composed of a polylactic acid-glycolic acid copolymer (PLGA) and a first hydrophobic drug, the middle layer is formed by wrapping the core layer with carboxymethyl chitosan, and the shell layer is composed of a first hydrophobic drug and a second hydrophobic drug. The first hydrophobic drug comprises a first therapeutic drug, the middle layer comprises a second therapeutic drug, the shell layer is composed of a polylactic acid-caprolactone copolymer PLCL and a third hydrophilic drug, and the first hydrophobic drug, the second therapeutic drug and the third hydrophilic drug are different from one another. Through the layered design of the core layer, the middle layer and the shell layer and in combination with differential degradation rates of PLGA, carboxymethyl chitosan and PLCL materials, gradient release of hydrophobic and hydrophilic drugs is achieved, a drug release curve is matched with the pathological stage of intraocular diseases, macular degeneration rapidly inhibits vascular leakage in the early stage and continuously resists inflammation in the later stage, and the effect of treating macular degeneration is achieved. And the layered slow-release synergistic treatment effect is verified.

The invention relates to the technical field of biomedical material synthesis, in particular to a synthetic method of a bionic gradient mineralized collagen-polycaprolactone composite material, which comprises the following steps: a) activating the surface of PCL (polycaprolactone) through argon plasma to generate carboxyl groups with the density of more than or equal to 5 * 10 / cm; b) carrying out amination modification on nano-hydroxyapatite (nHA) by adopting APTES, wherein the surface potential of the modified nHA is greater than or equal to + 15 mV; c) covalently grafting aminated nHA to the surface of PCL through an amido bond under the conditions that the molar ratio of EDC / NHS is 1: 2 and the pH is 5.5 + / -0.2, and the grafting density is greater than or equal to 3 * 10 particles / mu m; the method has the beneficial effects that the gradient mineralization structure is subjected to bionic optimization: the concentration and the flow velocity (the inner / outer layer flow velocity ratio is 1: 3) of mineralization liquid are accurately controlled through a microfluidic gradient generator, linear gradual change (the gradient slope is 1.5 + / -0.3 wt% / 100 [mu] m, R is equal to 0.97) of the mineralization degree from 20-30 wt% of the inner layer to 50-60 wt% of the outer layer is realized, the mechanical gradient characteristics of the natural bone are simulated, the compression modulus is increased from 0.8 GPa of the inner layer to 3.2 GPa of the outer layer in a gradient manner, and the mechanical property of the natural bone is improved. The mechanical matching property of the material and the host bone is obviously improved.

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 invention relates to the technical field of biomedical materials, and discloses a degradable non-woven fabric and a preparation process thereof, the non-woven fabric is prepared from polylactic acid, polycaprolactone, periodate, a copolyester oligomer containing a cis-1, 2-cyclohexanediol structural unit, and a solid biocompatible weakly alkaline salt; the preparation process comprises the following steps: mixing the components, and performing melt blending and melt-blowing spinning to prepare the non-woven fabric. The periodate and the copolyester oligomer are used as latent reaction precursors, the alkalescent salt is used as a pH regulating agent, when the non-woven fabric is in contact with an aqueous environment, the alkalescent salt is dissolved out to establish an alkalescent microenvironment, the periodate is promoted to carry out oxidative cracking on the copolyester oligomer, and thus the aldehyde compound with antibacterial activity is generated in situ. According to the invention, the on-demand generation of antibacterial substances is realized, so that the non-woven fabric has high antibacterial rate and low cytotoxicity, and the technical problem that the activity and safety of a traditional antibacterial material are difficult to balance is solved.

The invention discloses a polylactic acid composite material for a packaging bottle and a preparation method of the polylactic acid composite material. The polylactic acid composite material for the packaging bottle is prepared from the following components in parts by mass: 50 to 70 parts of polylactic acid, 10 to 30 parts of poly (epsilon-caprolactone), 10 to 30 parts of poly (propylene carbonate), 30 to 50 parts of functional master batch and 0.1 to 0.5 part of antioxidant, the functional master batch is prepared from a polylactic acid-modified nano silicon dioxide-poly (propylene carbonate) graft and a polylactic acid-modified nano silicon dioxide-poly (epsilon-caprolactone) graft; the modified nano silicon dioxide is 4-phenylethynyl phthalic anhydride modified nano silicon dioxide. The modified nano silicon dioxide is obtained by adopting an ultrasonic blending method, and different macromolecular substances are bonded through the modified nano silicon dioxide by utilizing an electron irradiation method to obtain a modified graft, so that the surface energy of particles can be reduced, the agglomeration among the particles can be reduced, and the dispersing performance of the nano silicon dioxide can be improved.

The application belongs to the field of solid waste plastic resource utilization, and discloses a method for depolymerization and recovery of polycaprolactone by low-temperature plasma coupling catalysis. Polycaprolactone particles are subjected to plasma discharge treatment together with a catalyst to make the polycaprolactone particles depolymerize, thereby realizing the depolymerization and recovery of polycaprolactone. The application utilizes the Joule heat generated by plasma discharge to liquefy polycaprolactone, and after liquefaction, the polycaprolactone fully contacts the active sites of the catalyst, and meanwhile, under the action of active free radicals generated by plasma treatment and the catalyst, realizes fast polycaprolactone depolymerization and recovery without external heat source, solvent and pressure. The complete conversion of polycaprolactone is realized within 1 hour, and the yield of gamma-caprolactone monomer can be as high as 88.9%, which is significantly better than the current solvent thermal method.

This invention discloses a method for preparing poly(glycolic acid-caprolactone) copolymers, belonging to the field of polymer synthesis technology. The method includes: prepolymerizing ε-caprolactone with a catalyst and initiator at 40–60°C below the melting point of glycolide under an inert atmosphere; adding glycolide and heating to 160–220°C for the main polymerization reaction; after the reaction, dissolving, precipitating, washing, and drying to obtain the poly(glycolic acid-caprolactone) copolymer. This invention utilizes the physical difference in melting points between glycolide and ε-caprolactone, preferentially prepolymerizing ε-caprolactone at a temperature below the melting point of glycolide, resulting in a higher conversion rate of ε-caprolactone than glycolide in the initial stage of the main polymerization, effectively controlling the copolymerization reaction pathway. Using this method, copolymers with a weight-average molecular weight of not less than 100,000 Da and an intrinsic viscosity of 1.8–3.5 dL / g can be obtained within a wide range of glycolide molar content from 15% to 85%, and the degradation behavior is stable and controllable. This method is simple and requires no special equipment or chain extender, making it suitable for the large-scale preparation of medical materials such as absorbable sutures and tissue repair scaffolds.

The application discloses an acetylene diol compound and a preparation method and application thereof, and comprises the following steps: step one, acetylene diol monomers and caprolactone monomers are added into a reaction kettle, and nitrogen is introduced as a protective gas; step two, the temperature of the reaction kettle is increased to 40-60 DEG C, and a vacuum pump is opened to remove water; step three, after dehydration is completed, a catalyst is added, and the temperature is increased to a reaction temperature; after the temperature is increased, the reaction kettle is slowly introduced with an ethylene oxide monomer, and the pressure of the reaction is controlled; step four, after the reaction is completed, the vacuum pump is opened to perform vacuum devolatilization for 1-2 hours, and finally, the product is obtained after cooling and discharging, thereby the surfactant of the application has better high-temperature resistance and acid and alkali resistance than general acetylene diol polyether surfactants, has a wide application range, is non-toxic and can be degraded, can be quickly degraded even if discharged into the environment, is very friendly to the environment, and has a low surface tension.