155results about How to "With shape memory function" patented technology

The invention relates to a preparation method of a degradable lacrimal passage bracket with a shape memory function. The method comprises the following steps: directly synthesizing a degradable polymer with low weight-average molecular weight by a copolycondensation method with lactic acid, dihydric alcohol or lactic acid, glycollic acid and caprolactone as monomers or by a ring-opening polymerization of lactide and dihydric alcohol or lactide, glycolide and caprolactone; expanding chains; adding nanometer SiO2; melting and co-extruding to prepare a degradable nanometer compound material; extruding and forming to prepare a cylindrical tube of which the inner diameter is 0.4-0.6mm, the outer diameter is 0.8-1.2 mm and the length is 55-65mm; stretching the tube to be a long and thin tube of which the inner diameter is 0.2-0.4mm, the outer diameter is 0.5-0.9mm and the length is 75-85mm at a temperature higher than glass-transition temperature; and cooling and storing to obtain the required product. The lacrimal passage bracket can be used for treating obstruction of nasolacrimal canal, and when the bracket is implanted into the lacrimal passage, the environmental temperature is higher than the glass-transition temperature, and the bracket deforms and recovers, and the diameter gets thick, so that the lacrimal passage bracket is not easy to fall and is like flexible rubber, and the patient feels comfortable.

The invention relates to a poly sebacic-co-propanetriol ester biodegradable shape memory polymer and a preparation method thereof. The invention relates to a biodegradable shape memory polymer and the preparation method thereof. A product of the invention is formed by the copolymerization and the cross linking of sebacic acid and propanetriol. The method is as follows: a. a preformed polymer is prepared; and b. the product is obtained by moulding, cross linking and solidifying. The product has the advantages of large deformation, the high restoration ratio of deformation and good biocompatibility. The shape restoration temperature is 0 DEG C to 45 DEG C; the tensile strength is 0.5-10MPa; and the degradation time is 30 to 300 days. The poly sebacic-co-propanetriol ester biodegradable shape memory polymer can be used as material for repairing human body soft tissue injury, such as cornea, retina, skin, blood vessel, connective tissue, islet tissue, musculature, nervous tissue, etc. The method has simple technology and convenient operation.

The invention relates to a high-elastic polyvinyl chloride weather-resistant flame-retardant super-bright crystal membrane and a preparation method thereof, and belongs to the technical field of polyvinyl chloride crystal membranes. The high-elastic polyvinyl chloride weather-resistant flame-retardant super-bright crystal membrane comprises the following components in parts by mass: 100 parts of polyvinyl chloride resin, 50-80 parts of a primary plasticizer, 5-10 parts of a secondary plasticizer, 2-5 parts of a heat stabilizer, 0.1-0.5 part of an antioxidant, 0.05-0.15 part of a hand clearing agent, 0.5-1 part of a processing aid, 3-10 parts of a flame retardant, 0.005-1 part of a colorant, and 10-30 parts of modified polyvinyl chloride resin or 2-8 parts of an elasticator. The preparation method comprises the following steps: (1) preparation of a kneading material: feeding materials in a metered mode, mixing, and carrying out cold stirring for cooling; (2) plasticizing: carrying out plasticizing by using a planetary extruder; (3) calendering: carrying out calendering for preparing a membrane; (4) purifying and setting: purifying a water tank, and cooling for setting; (5) wringing and drying: wringing by using a wringing roller, and enabling the obtained product to pass through a hot roller; and (6) cooling and coiling: cooling the roller, and pressurizing for coiling. The membrane disclosed by the invention is simple in process, high in controllability, good in product transparency, good in low-temperature flexibility and resilience, smooth in high-temperature handfeel, high in mechanical properties, flame-retardant, environment-friendly, and safe.

The present invention relates to a production process for a memory alloy material, and discloses a production process for a titanium and nickel shape memory alloy material. The production process comprises the following steps that: 43-46% of titanium sponge and 54-57% of electrolytic nickel are filled in a vacuum induction melting furnace to carry out refining to obtain an alloy ingot casting; pipes are respectively rolled through three pipe rolling devices comprising LD30, LD15 and LD8; a treatment of vacuum annealing is repeatedly performed to roll the pipes into the pipes with diameters of0.6-1.2 mm; the pipes with core rods are drawn through a drawing machine, such that the pipe material is subjected to a surface oxidation treatment to prepare the titanium and nickel shape memory alloy material. The process of the method provided by the present invention is simple, and the produced titanium and nickel shape memory alloy material has a shape memory function.

The technical scheme of the invention discloses a valve crossing device which comprises a valve crossing device main body and a valve crossing device rod. The valve crossing device main body is of a hollow three-dimensional structure; the valve crossing device rod is connected with the valve crossing device main body. According to the valve crossing device provided by the technical scheme of the invention, an excellent auxiliary effect is achieved when a guide wire reversely crosses the valve, the surgical operation time is greatly shortened, a chordae tendineae mesh is difficultly penetrated, the complication occurrence probability is greatly reduced, the surgical safety and treatment effect are greatly improved, and the valve crossing device has a high application value.

The invention discloses a preparation method of a spun silk/PTT (polytrimethylene terephthalate) blended fabric with a shape memory function. The preparation method is characterized by comprising the following steps: blending PTT short fibers in the blended dry weight ratio of 30 to 70 percent with spun silk fibers to obtain spun silk/PTT blended yarns with the linear density of 83.3 to 166.7 dtex; taking the blended yarns as weft yarns and warp yarns, configuring the density of the warp yarns to be 450 to 600 yarns/10cm, the density of the weft yarns to be 200 to 280 yarns /10cm and the total coverage coefficient of the fabric to be 75+/-3 percent, configuring the number of fabric tissues to be 2 or 4, making fabric gray cloth, and forming finished fabric by refining, four-time washing, drying and shaping. By applying the method provided by the invention, the fabric has high tensile-recovery elasticity, crease recovery,and a shape memory function of shaping, flattening, and smoothening easily, and meanwhile, has the advantages of high moisture permeability, high flexibility, high wear comfort and the like, is a functional spun silk shell fabric, and can serve as the shell fabric of high-end casual clothes.

The invention relates to a modified epoxide resin with a shape memory function and a preparation method of the modified epoxide resin, belonging to the technical field of a functional high molecular material. The response temperature of the modified epoxide resin material provided by the invention can be adjusted within the range of 32-60 DEG C, the material can be bent at a large angle of 720 degrees at the temperature more than the thermal response temperature, and the shape fixed rate and recovery rate of the modified epoxide resin reach 100%. The preparation method of the modified epoxide resin comprises the following steps of: firstly, preparing end sulfydryl dihydric alcohol ester; secondly, preparing modified epoxide resin; and thirdly, preparing the modified epoxide resin with the shape memory function. Compared with the existing shape memory material, the modified epoxide resin has the advantages of being simple in preparation technology, capable of meeting a green environment protection requirement, low in thermal response temperature, capable of being adjusted, capable of realizing saturated solidifying, low in solidifying temperature, short in solidifying time, short in thermal response time, large in sample flexible angle, and high in shape recovery rate.

The invention discloses a grid-reinforced intelligent paper folding composite material structure design method, and belongs to the technical field of composite material structure design. A grid-reinforced intelligent paper folding composite material structure comprises a paper folding base body with folding marks and a grid-reinforced shape memory rigid framework. The grid-reinforced intelligent paper folding composite material structure design method comprises the steps that the grid-reinforced shape memory rigid framework is laid on the paper folding base body with folding marks, and then the paper folding base body with the folding marks and the grid-reinforced shape memory rigid framework are bonded and compounded together by using a resin glue with a shape memory function. A grid-reinforced intelligent paper folding composite material designed by the grid-reinforced intelligent paper folding composite material structure design method is light in structural mass, reliable and controllable in folding and unfolding and high in configuration changing capacity, meanwhile, the bearing performance after unfolding can also be guaranteed, and the design requirement of a large-scale expandable structure can be well met. The grid-reinforced intelligent paper folding composite material structure design method provides an effective solution for innovative design of a large foldable structure, and can be applied to design of structures which requirements on light weight, reliable folding and unfolding and high bearing capacity after unfolding.

The invention discloses a thermoplastic copolyester composition with thermally reversible chemical crosslinking properties and a preparation method and application thereof. The copolyester contains a side functional group, namely 2-furfuryl sulfenyl, and is prepared from dibasic acid or dibasic acid ester containing 2-furfuryl sulfenyl, dibasic acid and dibasic alcohol by a melting copolycondensation method. The 2-furfuryl sulfenyl of the copolyester and a crosslinking agent containing maleimide can carry out Diels-Alder cycloaddition reaction at 50-70 DEG C to realize chemical crosslinking and can realize decrosslinking at high temperature, thereby being convenient for recovery and secondary processing and utilization of the materials and realizing a self-repairing or shape memory function of the materials. The thermally reversible crosslinking copolyester designed in the invention has a saturated main chain structure, has excellent thermal stability and mechanical properties, is not easy to generate an irreversible crosslinking structure in thermal processing and life-time service processes of the materials, and can realize thermoplastic processing many times and keep the mechanical properties unchanged.

The invention relates to a wall cloth fabric with a shape memory function. The wall cloth fabric is characterized by comprising a fabric body (1) which is interwoven into a latticed structure by use of warp yarns (2) and weft yarns (3), wherein the weft yarns (3) are made of memory fiber polyester; the fabric body (1) is orderly covered by a polyurethane layer (4), a flax fiber core layer (5) and a ramie layer (6). The wall cloth fabric with the shape memory function is interwoven into the latticed structure by use of the warp yarns and the weft yarns and the fabric body has excellent air permeability and is strongly layered; the weft yarns are made of the memory fiber polyester, so that the fabric body has crease resistance and rebound resilience; the polyurethane layer on the fabric body is waterproof, breathable, transparent and visible, and antibacterial, while the flax fiber core layer on the fabric body is capable of absorbing moisture and dissipating heat, and is healthy and bacteriostatic, antifouling and anti-static, ultraviolet-proof, and highly flame retardant, and the ramie layer on the fabric body has the characteristics of bacteria resistance and bacteriostasis, deodorization adsorption, moisture absorption and air permeability, mold proofing and wear resistance.

The invention relates to a multilayer composite artificial vascular membrane with a shape memory function and a preparation method thereof. The vascular membrane comprises a core layer, an inner layer and an outer layer, wherein the core layer is made of a material with a shape memory function; and the inner layer and the outer layer are polyfluortetraethylene membranes. The preparation method comprises the following steps of: using elastic fiber with the shape memory function as a base material of a textile; preparing a textile base covering membrane as the core layer of the artificial vascular membrane through a textile forming technology; carrying out mould pressing on the core layer, the inner layer and the outer layer by a mould; and preparing the integrative artificial vascular membrane. The invention has simple method and low cost and is suitable for industrialized production. The obtained vascular membrane is embedded into a body to cooperate an aorta stent, automatically releases and bursts into a branch artery by using the obvious blood pressure difference between the branch artery and a main artery after the branch artery is blocked, simplifies the whole operating process and reduces the surgery difficulty.

The invention discloses multiple physical cross-linked hydrogel and a preparation method thereof. The preparation method of the hydrogel comprises the following steps: coating 4-{6-[3-(6-methyl-4-oxo-1,4-dihydropyrimidine-2-yl) carbamido] hexyl carbamyloxy}butyl acrylate (UPy-HCBA) in sodium dodecyl sulfonate (SDS) micelles, adding hydrophilic acrylamide monomer (AAm) and acrylic acid (AAc) outside the micelles, performing emulsion polymerization and physical crosslinking so as to prepare gel with excellent tensile property but low strength; and performing Fe<3+> coordination crosslinking on the gel, thereby obtaining the high-strength super-tensile hydrogel. The multiple physical cross-linked hydrogel is simple in preparation method, wide in raw material source and low in price, and has potential application value in the field of functional polymers.

The invention discloses a 4D deformed reticulated hollowed degradable vascular stent with concave-convex structures on the inner and outer surfaces, a preparation method and a use method thereof. A thermoplastic polymer containing a dynamic covalent bond, a thermosetting polymer containing a functional group capable of further crosslinking or a thermosetting polymer is used as a raw material, theraw material is cut or clipped to form a desired hollowed structure, the material is heated to more than or equal to the transition temperature and then stretched to obtain a reticulated hollowed pattern with concave-convex structures on the inner and outer surfaces, the raw material is rolled into a tubular shape and fixed, then bond exchange of the dynamic covalent bond is activated or the functional group is initiated for crosslinking, molding is finished, and a shape-permanent vascular stent product is obtained. The brand-new method for producing in-vivo stents provided by the invention has the characteristics of simple operation, high molding speed, simple process steps, no need of professional equipment and the like, and the integrated design of once molding of the complex stent shape, rapid manufacturing and 4D self-deformation function is realized.

The invention discloses a customized lingual side fixed retainer which can provide continuous and stable retentiveness, shorten a patient treatment cycle and realize personalized treatment, and a preparation method thereof; the customized lingual side fixed retainer includes a fixed retainer main body which is molded by one time through three-dimensional stereoscopic printing, and the fixed retainer main body is made of an alloy material, and is pasted and fixed with patient teeth through resin. The invention provides the customized lingual side fixed retainer and the preparation method thereof; the customized lingual side fixed retainer made of the alloy material having a shape memory function has a personalized shape matched with arraying of patient own teeth; through self positioning with a fixed retaining structure which is safely fitted to the hook shape of the surface of each tooth, fast pasting is achieved, an indirect pasting guide plate for positioning has no need of additional design, and the difficulty and intensity of doctor clinical operation are reduced.

The invention relates to a preparation method for a PPS/PGS composite material shape memory elastomer. The preparation method comprises the following steps: (1) preparation of PGS, (2) preparation of PPS, and (3) preparation of the PPS/PGS composite material shape memory elastomer by compounding the PPS and the PGS. According to the preparation method, a polymer PPS having a high crystallization property is introduced into a PGS matrix to prepare a shape memory elastomer having shape transition temperature close to human body temperature (37 DEG C), and indocyanine green ICG having a light and heat conversion effect is introduced into the PPS/PGS composite material shape memory elastomer through surface coating modification treatment; furthermore, a light-controlled shape memory elastomer with a shape capable of being controlled at a fixed point is prepared, and better application is realized in medical fields such as minimally invasive surgery, sustained drug release and the like.

The invention provides a self-repairing three-dimensional carbon fiber/memory alloy aircraft shell layer and a preparation method thereof. The self-repairing three-dimensional carbon fiber/memory alloy aircraft shell layer comprises carbon fiber-based three-dimensional base cloth and a self-repairing polymer filler. The preparation method specifically comprises the following steps: taking carbon fiber as weft yarn and a wavy memory alloy as warp yarn, adopting a three-dimensional angle interlocking structure, and interweaving each two layers of the warp yarn with the weft yarn in the thicknessdirection to prepare three-dimensional angle interlocking base cloth; immersing the three-dimensional angle interlocking base cloth in electrolyte for anodic oxidation treatment, and carrying out cleaning and drying to obtain oxidized three-dimensional angle interlocking base cloth; and after uniformly mixing repairable epoxy resin and polyethersulfone, putting the mixture into a mold, flatly paving micro-capsules containing photosensitizer in the mold, soaking the base cloth in the mold, and carrying out standing adsorption, heating, pressurizing and microwave curing to obtain the self-repairing three-dimensional carbon fiber/memory alloy aircraft shell layer. The shell layer prepared with the method provided by the invention has the advantages of being low in weight, high in strength, capable of self-repairing internal damages, and prolonged in service life.

The invention discloses a preparation method of clean and ecologically-degradable PVC (Polyvinyl Chloride) decorative artificial leather. The artificial leather is prepared from ecological PVC slurry;the ecological slurry is prepared from the following components: PVC resin powder, vinyl chloride-vinyl acetate resin, diacetyl epoxidized soybean glyceryl oleate, a polycaprolactone based polyurethane elastomer, a foaming agent, epoxidized soybean oil, organic modified clay, a lubricant, a silicone master batch and a stabilizing agent. The artificial leather obtained by a treatment technology has the advantages of no toxin and environmental friendliness, low temperature resistance, wear resistance and scratching resistance, excellent softness, extreme easiness for maintenance, capability ofbeing partially biodegraded, good texture, full color and luster, moisture absorption and ventilation, smoothness and comfort, antibacterial and deodorization performance and good anti-migration performance.

The invention discloses a piezoelectric energy harvester device having a shape memory function and a method thereof. The piezoelectric energy harvester device comprises a first clamp, a rechargeable battery pack, a first piezoelectric energy harvester, a second piezoelectric energy harvester and a second clamp. The first piezoelectric energy harvester and the second piezoelectric energy harvesterare bonded through glue; the first clamp, the first piezoelectric energy harvester, the second piezoelectric energy harvester and the second clamp are connected in sequence, and are connected throughbolts and nuts; and the rechargeable battery pack is connected with the first clamp through a screw. The piezoelectric energy harvester device has a shape memory effect and a piezoelectric effect, isunfolded into a cantilever structure during working state and converts the external vibration energy into electric energy for storage, and is folded into a compact structure during non-working state.The piezoelectric energy harvester device can meet application occasions where an aircraft and the like has requirements for space.

The invention relates to a polyester type biodegradable shape memory polymer and a preparation method thereof. The product is essentially formed by the copolymerization and the cross linking of sebacic acid, propanetriol and diol. The method is as follows: a. the sebacic acid and the diol are copolymerized, and the propanetriol is added for copolymerizing; and b. the product is obtained by moulding, cross linking and solidifying. The product has the advantages of large deformation, the high restoration ratio of deformation and good biocompatibility. The shape restoration temperature is 0 DEG C to 45 DEG C; the tensile strength is 0.5-10MPa; and the degradation time is 30 to 300 days. The polyester type biodegradable shape memory polymer can be used as material for repairing human body soft tissue injury, such as cornea, retina, skin, blood vessel, connective tissue, islet tissue, musculature, nervous tissue, etc. The method has simple technology and convenient operation.

The invention discloses a multifunctional polysiloxane thermoplastic elastomer as well as a preparation method and application thereof. The elastomer is prepared by the following method: taking 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and octamethylcyclotetrasiloxane as raw materials, and carrying out a reaction under the action of a catalyst tetramethylammonium hydroxide pentahydrate,so as to obtain double amino-terminated polysiloxane; with double amino-terminated polysiloxane, 3,3',4,4'-biphenyl tetracarboxylic dianhydride and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane as raw materials, and carrying out a reaction to obtain a polysiloxane-polyamic acid segmented copolymer; and finally, under the action of high temperature, obtaining the polysiloxane-polyimide block polymer with high mechanical properties, a shape memory function and a self-healing function.