1096 results about "Caprolactone" patented technology

The invention provides a high-temperature-resistant and high-salt-resistant nano imbibition agent as well as a preparation method and application thereof. The high-temperature-resistant and high-salt-resistant nano imbibition agent is prepared from amination modified mesoporous silica nanoparticles, nano cellulose, rhamnolipid, an anionic surfactant, citrate modified sodium zirconium phosphate, polyethylene glycol-b-polycaprolactone and a sulfydryl-carboxyl imidazoline derivative, therefore, the composite carrier formed by the aminated mesoporous silica nanoparticles and the nanocellulose has high mechanical strength and uniform dispersity, the oil-water interfacial tension is reduced through the synergistic effect of the rhamnolipid and the anionic surfactant, and the crude oil stripping efficiency is remarkably improved; the citrate modified sodium zirconium phosphate enables the salt resistance of the system to be greatly improved, and in a high-temperature and high-salt oil reservoir environment, the nano imbibition agent can remarkably improve the crude oil recovery rate and reduce the injection pressure and dosage; meanwhile, good adsorption resistance is achieved, and reservoir blockage is prevented; in addition, low-toxicity corrosion inhibition components protect equipment, and the service life of an oil well is prolonged.

The invention discloses an injection filler and a preparation method and application thereof, the filler is polycaprolactone particles, the polycaprolactone particles are spherical particles, the particle size of the spherical particles is 20-100 [mu] m, and the polycaprolactone particles have rough surfaces or unsmooth surfaces. The polycaprolactone microspheres have rough surfaces or unsmooth surfaces, so that the contact area with cells is increased, the adhesion ability and residence time of the cells are improved, the affinity of the polycaprolactone microspheres is improved, and the growth of collagen can be stimulated and accelerated. In the preparation process, the dosage of each component is scientifically screened, and on the basis of controlling the viscosity of a water-phase solution, the spherical polycaprolactone particles which are regular, rough in surface and uniform in particle size are obtained in cooperation with a rapid membrane emulsification method.

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 belongs to the field of biomedical materials, and particularly discloses a preparation method and application of a 3D printing porous composite scaffold. I-type collagen and silk fibroin composite gel is modified on a 3D printing three-element doped hydroxyapatite / polycaprolactone (PCL) composite scaffold with a polydopamine coating, the three-element doped hydroxyapatite is synthesized by using a chemical precipitation method, and Mg < 2 + >, Sr < 2 + > and SeO3 < 2-> ions are doped in crystal lattices. The 3D printing porous composite scaffold provided by the invention effectively simulates the structure and function of soft and hard combination of natural bones, is helpful for regulating and controlling the stem cell fate to improve the bone regeneration process, repairs bone defects while eliminating tumors, and can be applied to bone defect repair or osteosarcoma treatment.

The invention relates to the technical field of degradable plastics, and provides biodegradable plastic particles as well as a preparation method and application thereof. The biodegradable plastic particles comprise the following components in parts by weight: 50-80 parts of PLA, 20-50 parts of PBAT, 5-20 parts of a filler, 1-8 parts of a flexibilizer, 1-5 parts of a lubricant and 5-10 parts of a modifier. The modifier comprises a polylactic acid-polyethylene glycol block copolymer and a polycaprolactone-polyglycidyl methacrylate block copolymer in a mass ratio of (1: 19)-(19: 1). According to the technical scheme, the problems of poor flexibility and strength of plastic particles in related technologies are solved.

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 biochar-based slow-release fertilizer and a preparation method thereof, and relates to the technical field of fertilizer production, the biochar-based slow-release fertilizer comprises a core, a carrier layer, a biological layer and a protective layer, the core is composed of macroelements, microelements and a nitrification inhibitor; the carrier layer comprises graphene quantum dot modified charcoal, chitosan, glycerol and cyclodextrin grafted starch; the biological layer is prepared from magnetic Fe3O4 and humic acid nanoparticles, alginic acid oligosaccharide and diatomite; the protective layer comprises a polylactic acid-polycaprolactone block copolymer, acetone, calcium lignosulphonate, a dynamic covalent cross-linking agent gelatin, nano cellulose and an anti-blocking agent. Therefore, by adopting the polylactic acid-polycaprolactone (PLA-PCL)-based segmented copolymer and the dynamic covalent network cross-linking agent, the self-repairing property is endowed. The slow-release fertilizer provided by the invention realizes precise regulation and control of the fertilizer efficiency release rate through a multi-level synergistic effect, has the functions of soil remediation and stress resistance, and significantly improves the utilization efficiency of the fertilizer and the crop adaptability.

The invention discloses a packaging bag with high sealing performance and a preparation process thereof, and belongs to the technical field of packaging materials, the packaging bag comprises the following raw materials: polylactic acid, polycaprolactone, a nano-silver filler composite antibacterial agent and an epoxy compatilizer; the nano-silver filler composite antibacterial agent is formed by depositing a hybrid modified coating on the surface of a nano two-dimensional filler and then loading nano-silver; the hybrid modified coating is prepared from polydopamine and hyperbranched polyethyleneimine. The polylactic acid and the polycaprolactone are used as main base materials, and the packaging bag is endowed with good mechanical properties by utilizing high mechanical strength of the polylactic acid and excellent flexibility of the polycaprolactone; a nano-silver filler composite antibacterial agent and an epoxy compatibilizer are also added, the nano-silver filler composite antibacterial agent takes a nano-two-dimensional filler as a raw material, the nano-two-dimensional filler has a high length-diameter ratio and can block permeation of gas molecules, and the dispersion performance is improved by combining the nano-two-dimensional filler with the epoxy compatibilizer; the barrier property and the mechanical property of the packaging bag are further improved.

The invention relates to the field of sponge materials, and provides an antibacterial degradable sponge material and a preparation method thereof. The material is prepared from protocatechuic acid modified quaternized chitosan, quaternary ammonium salt grafted gelatin, sodium alginate, polyhydroxybutyrate, polycaprolactone, a polylactic acid-glycolic acid copolymer, hexamethylene diisocyanate, a foaming agent, nano cellulose, vitamin E, polyethylene glycol, triethylamine and dimethylformamide. Protocatechuic acid and quaternized chitosan are subjected to amidation modification, and chitosan and gelatin are subjected to quaternization treatment by adopting 2, 3-epoxypropyl trimethyl ammonium chloride, so that the antibacterial property and biodegradability of the material are improved. In the material preparation process, through vacuum degassing, foaming vacuum degree and humidity control and a multi-step drying process, it is ensured that the average pore size of the material is uniform (50-200 microns) and the porosity is high (50%-90%), and the obtained material has excellent antibacterial property and degradability and has wide application value.

The invention belongs to the technical field of multifunctional fibers, and particularly relates to a preparation method of multifunctional jasmine, camellia and chamomile fibers, and the preparation method comprises the steps of preparation of beta-cyclodextrin microspheres, modification of carboxyl, adsorption, preparation of bis-aminated polyethylene glycol polycaprolactone and spinning. The prepared multifunctional jasmine, camellia and chamomile fiber has an excellent antibacterial effect and a natural antibacterial effect, the bacteriostasis rate to staphylococcus aureus is 98.5-99.2%, the bacteriostasis rate to candida albicans is 98.2-99%, the bacteriostasis rate to escherichia coli is 97.5-98.7% after the multifunctional jasmine, camellia and chamomile fiber is washed with water for 50 times, and the antibacterial standard of textiles is met; the antibacterial durability is good, and the average antibacterial loss rate after 50 times of washing is lower than 2%; the antioxidant and anti-mite effects are good, and the free radical scavenging rate is more than 96%; and the mite repelling rate is greater than 70%.

The invention relates to the technical field of dental restoration materials, in particular to a bacteriostatic dental restoration composite film and a preparation method thereof. The oral cavity restoration composite film is composed of an upper-layer antibacterial film, a middle-layer polycaprolactone fiber film and a lower-layer bone restoration film. The upper-layer antibacterial film is prepared from the following components in parts by weight: 3 to 4 parts of cinnamon essential oil, 0.5 to 1 part of xanthan gum, 0.5 to 1 part of seed meal protein, 0.1 to 0.15 part of tannic acid, 5 to 7 parts of silk fibroin, 1 to 1.5 parts of polylactic acid, 0.6 to 1 part of chitosan, 1 to 1.5 parts of polyvinyl alcohol and 1.5 to 2.5 parts of glycerol; the lower-layer bone repair membrane is prepared from the following raw materials in parts by weight: 2 to 3 parts of nano-hydroxyapatite, 3 to 5 parts of citric acid, 6 to 9 parts of lactic acid, 3 to 4 parts of tyrosine, 1 to 2 parts of glycollic acid, 2 to 3 parts of casein, 0.2 to 0.3 part of hyperoside and 1 to 2 parts of gelatin.

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 high-dispersion graphene conductive adhesive solution for a battery and a preparation method of the high-dispersion graphene conductive adhesive solution, and belongs to the technical field of conductive adhesive solutions. The high-dispersion graphene conductive adhesive solution for the battery prepared by the invention is prepared from the following raw material components in parts by mass: 6 to 8 parts of high-dispersion graphene, 4.5 to 13.5 parts of an adhesive and 60 to 90 parts of a solvent, the preparation method comprises the following steps: ultrasonically dispersing graphene in a mixed solution of hexadecyl triyl ammonium bromide and deionized water, sequentially adding hexadecyl triyl ammonium bromide, sodium molybdate dehydrate, bismuth nitrate pentahydrate and cerium nitrate hexahydrate, uniformly stirring and dispersing, performing hydrothermal reaction, washing, drying, grinding and sieving to obtain the high-dispersion graphene. The adhesive is prepared from an amphiphilic polyethylene glycol-polycaprolactone block copolymer and amphiphilic polyacrylate.

The invention provides hydrogel wound dressing and a preparation method thereof.The hydrogel wound dressing comprises a hydrogel layer, a supporting layer and a protective layer, the hydrogel layer is prepared from, by mass, 10%-15% of polyvinylpyrrolidone, 5%-8% of polycaprolactone, 2%-4% of sodium carboxymethyl cellulose, 1%-3% of chitosan, 0.5%-1.5% of an antibacterial agent, 0.1%-0.3% of an antioxidant and the balance water; the invention discloses a graphene quantum dot gel which comprises the following components in percentage by weight: 0.01-0.1% of a growth factor, 0.1-0.5% of a temperature-sensitive polymer, 0.05-0.15% of graphene quantum dots, 0.5-1.5% of a self-healing polymer, 0.5-1.5% of a pH sensitive material, 0.1-0.3% of nano titanium dioxide and the balance of deionized water. The supporting layer is a porous polylactic acid film, and the thickness of the supporting layer is 0.1-0.3 mm; the protective layer is an air-permeable polyurethane film, and the thickness of the protective layer is 0.2-0.4 mm. Through the synergistic effect of an antibacterial agent, nano titanium dioxide and graphene quantum dots, the antibacterial performance of the dressing is remarkably improved.

The invention relates to a foamable composition, biodegradable PMI (polymethacrylimide) foam and a preparation method thereof. The foamable composition comprises comonomers, an initiator, a foaming agent and a cross-linking agent, the comonomers comprise a first comonomer and a second comonomer, the first comonomer is selected from one or two of methacrylonitrile or acrylonitrile, and the second comonomer is selected from methacrylic acid; the composition also comprises a degradation agent, and the degradation agent is selected from one or a combination of more than two of polylactic acid, starch-based polyether polyol and polycaprolactone; the weight ratio of the degradation agent to the comonomer is (30-132): 180. According to the foamable composition disclosed by the invention, the biodegradation rate of the PMI foam is improved and the original high performance of the PMI foam is reserved by scientifically adding the degradation agent and adjusting the formula and adopting an in-situ polymerization technology.

The invention belongs to the field of biological medicine, and particularly relates to a polycaprolactone microsphere with narrow particle size distribution and a preparation method thereof. The preparation method comprises the following steps: S1, dissolving polycaprolactone in an organic solvent to obtain an oil phase solution; s2, adding an emulsifier into water, and stirring until the emulsifier is completely dissolved to obtain a water-phase solution; s3, adding the water-phase solution into the oil-phase solution while stirring to obtain a primary emulsion; s4, enabling the primary emulsion to pass through membrane holes of a membrane tube under a pressurization condition, forming polycaprolactone liquid drops in the aqueous phase solution, and taking away the polycaprolactone liquid drops by the circularly flowing aqueous phase solution to obtain a suspension emulsion; s5, stirring the suspension emulsion, removing the organic solvent, and curing the microspheres to obtain a polycaprolactone microsphere suspension; s6, the polycaprolactone microsphere suspension is washed with water and sieved, and wet pellets are obtained; s7, the wet pellets are collected, dried and screened, the polycaprolactone microspheres are obtained, the yield is high, the particle size is uniform, and the particle size span is smaller than or equal to 0.8.

The invention provides a polycaprolactone microsphere as well as an interfacial membrane emulsification preparation method and application thereof, and the interfacial membrane emulsification preparation method comprises the following steps: firstly, respectively preparing a dispersion phase containing polycaprolactone and a continuous phase containing a surfactant, and then centrifugally mixing the dispersion phase containing polycaprolactone and the continuous phase containing the surfactant in a planetary centrifugal emulsifying machine to form emulsion droplets; and finally, stirring the emulsion droplets to volatilize the organic solvent, washing with water, centrifuging and drying to obtain the polycaprolactone microspheres. The interfacial membrane emulsification preparation method is simple in process, convenient to operate and short in consumed time, and meanwhile, the prepared polycaprolactone microspheres are very uniform in particle size distribution, relatively narrow in particle size distribution, good in sphericity and good in application prospect, and the appearance of the polycaprolactone microspheres is of a spherical structure.

The invention discloses a biodegradable lamination material and a preparation method thereof. The method comprises the following steps: stirring and mixing PLA (polylactic acid), PBAT (polyethylene terephthalate-co-caprolactone), SiO2-HBPE3 (silicon dioxide grafted hyperbranched polyester) and an auxiliary agent through a high-speed mixer; the preparation method comprises the following steps: uniformly mixing the raw materials, adding the uniformly mixed raw materials into twin-screw extrusion equipment for extrusion, carrying out bracing, traction, cooling and pelletizing processes to prepare PLA coating composite modified particles, treating the modified particles in a vacuum dehumidification box, and finally coating.

The present invention discloses a class of nitrogen heterocycle-substituted hexa-dentate aminophenoxy rare earth complexes (I), a preparation method thereof, and an application thereof in the highly active catalytic ring-opening polymerization of lactones. The preparation method comprises the following steps: reacting a neutral ligand with a metal raw material compound in an organic medium, then adding an alcohol for reaction, and obtaining the target compound through filtration, concentration, and recrystallization. The nitrogen heterocycle-substituted hexa-dentate aminophenoxy rare earth complex of the present invention is a highly efficient catalyst for the ring-opening polymerization of lactones, and can be used for catalyzing the polymerization reaction of lactones such as lactide, and catalyzing the one-pot copolymerization of lactide and ε-caprolactone to obtain a multi-block copolymer. The nitrogen heterocycle-substituted hexa-dentate aminophenoxy rare earth complex of the present invention has good tolerance to impurities, has very high catalytic activity, and can obtain high molecular weight polyester materials. A has a structure shown in formula (II), (III), (IV) or (V); B has a structure shown in formula (VI) or (VII).

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 belongs to the technical field of chemical recycling, and particularly relates to a one-way depolymerization, high-purity and high-yield epsilon-CL closed-loop recycling method. According to the method, only trace acetylacetone metal salt is used as a catalyst, the epsilon-caprolactone monomer is recovered in a manner of in-situ catalytic degradation of PCL (polycaprolactone) under the assistance of heating and temperature rise in a low-vacuum environment, the depolymerization efficiency of 100% is realized, and the problems of low depolymerization yield, easiness in carbonization, long time, low purity of recovered products and the like in an existing method are solved. The product obtained by the method disclosed by the invention is pure, does not need complex post-treatment such as secondary purification, water removal and the like, has reaction activity of 100% repolymerization, can be directly used for repolymerization reaction to obtain regenerated PCL, and has the tensile strength of 31.3 MPa and the elongation at break of 831%. According to the method disclosed by the invention, polymer-monomer-polymer closed-loop circulation of PCL is perfectly realized by a mild depolymerization reaction process, and the possibility of industrial depolymerization-polymerization is expected to be realized.

The invention provides a full-degradable polymer composite material for tableware and a preparation method of the full-degradable polymer composite material, and belongs to the technical field of polymer materials. According to the invention, amylose corn starch, hydrophobic modified corn starch, cassava acetylated distarch phosphate, a polylactic acid-poly (butylene succinate) interpenetrating network structure material, a copolymer of 3-hydroxybutyrate and 3-hydroxyvalerate, polycaprolactone, stearic acid modified micron titanium dioxide, chitosan quaternary ammonium salt and a composite plasticizer are adopted according to a specific ratio; the fully-degradable polymer composite material is obtained by compounding the composite heat stabilizer and stearic acid, has controllable and good biodegradability and good mechanical properties, enhances heat stability, improves processability, makes all the components easier to mix uniformly, facilitates molding processing of the material, and improves production efficiency and product quality.

The invention discloses a polycaprolactone-polyethylene glycol copolymer gel and its preparation method and application, including: adding a high molecular weight cyclic polycaprolactone-polyethylene glycol copolymer, a low molecular weight cyclic polycaprolactone-polyethylene glycol copolymer and an additive into water, dissolving to obtain a milky white polycaprolactone-polyethylene glycol copolymer gel; the mass ratio of high and low molecular weight cyclic polycaprolactone-polyethylene glycol copolymer is (2-5):1; the additive is hydroxyapatite or tricalcium phosphate, the particle size of the additive is not more than 20 μm, and the mass of the additive accounts for 1% to 5% of the mass of the polycaprolactone-polyethylene glycol copolymer gel. The present invention can prolong the degradation cycle of the product, increase the efficacy, and obtain a polycaprolactone-polyethylene glycol copolymer gel with a long-lasting effect by compounding and controlling the mass ratio of high and low molecular weight cyclic polycaprolactone-polyethylene glycol copolymers.

The invention relates to a heat-dissipating and breathable exhaust insole and a preparation method thereof. The insole is obtained by weaving a braided rope, the braided rope is obtained by twisting a plurality of polyamide fiber yarns, and a heat-conducting coating layer is arranged on the surface of at least one polyamide fiber yarn. The heat-conducting coating layer is prepared from the following raw materials in parts by weight: heat-conducting filler, methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, aminopropyl double-terminated polydimethylsiloxane, silazane, maleic anhydride graft, a diluent, an inhibitor and platinum water. The dispersity and compatibility of the heat-conducting filler are promoted through silazane and aminopropyl double-terminated polydimethylsiloxane, and then the heat-conducting filler is matched with the methyl vinyl silicone rubber, the carboxyl-terminated polycaprolactone and the maleic anhydride graft, so that a heat-conducting coating layer obtained after curing is stably adhered to the surface of the polyamide fiber yarn; and meanwhile, the insole has better moisture absorption, elasticity and heat conduction performance, so that the woven insole has better air permeability, heat dissipation performance and comfort.

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 relates to a preparation method of polycaprolactone, which comprises the following steps: mixing epsilon-caprolactone, a polymerization initiator and a temperature response type solvent to obtain a mixture; polymerizing the mixture under the catalytic action of a catalyst to obtain a primary polymer; and separating out the primary polymer to obtain a final polymerization product. According to the preparation method of the polycaprolactone, the temperature response type solvent has the characteristic of temperature response and shows good solubility to a polymerization product at the conventional polymerization temperature of the epsilon-caprolactone, the system viscosity is greatly reduced in the polymerization stage, mass and heat transfer and continuous and uniform chain growth in the polymerization process are facilitated, and the yield of the polycaprolactone is improved. And when the temperature of the system is reduced to a specific temperature or below, the polymerization product is crystallized and separated out, and narrow-distribution polycaprolactone can be obtained by simple separation, so that the problems of thermal degradation of the product and monomer residue in the traditional high-temperature devolatilization are effectively solved.

The invention discloses a method for removing oligomers on the surface of a polyester fiber product, which comprises the following steps: adding the polyester fiber product into water, adding 0.1-10g of nonionic surfactant with the HLB (Hydrophile-Lipophile Balance) value of less than 10 according to 1L of water, cleaning for 5-30 minutes at 15-60 DEG C, then discharging liquid, adding the polyester fiber product into a non-aqueous medium, cleaning for 5-15 minutes at 15-50 DEG C, then discharging liquid, washing for 5-15 minutes at 15-50 DEG C, and drying to obtain the polyester fiber product. The non-aqueous medium is selected from at least one of tetrachloroethylene, n-butyl acetate, gamma-butyrolactone, epsilon-caprolactone and 1, 4-dioxane; and taking out the cleaned polyester fiber product, and putting the polyester fiber product into a dryer provided with a condensation recovery device for sealed drying. Experiments prove that the method not only can effectively remove the oligomer on the surface of the polyester fiber product, but also is simple to operate and easy to realize large-scale production, and has the advantages of low cost, high efficiency, environmental protection and the like, and the waste liquid can be recycled.

The invention discloses an anti-fibrosis drug coating degradable woven stent for treating urethrostenosis, the stent is a hollow cylinder formed by spirally weaving wires, the wires are made of biodegradable polymer materials, the surface of the stent is coated with a drug coating, anti-fibrosis drugs are selected as the drugs, and the anti-fibrosis drug coating is made of biodegradable polymer materials. The drug coating is prepared by using an ultrasonic atomization spraying method; the biodegradable polymer material comprises one or a compound of more than one of poly L-lactic acid, poly D, L-lactic acid, poly (L-lactic acid / D, L-lactic acid), poly (glycolide / lactide), poly (glycolide-lactide), poly (L-lactic acid / caprolactone), poly (glycolide / caprolactone), poly (D, L-lactic acid / caprolactone), polydioxanone and the like. The stent body is made into a self-expanding stent by adopting a weaving method; the biodegradable ureteral stent with the drug coating has good biocompatibility, degradability and mechanical property, and has a wide market application prospect.