41results about How to "Good shape recovery" patented technology

The invention discloses poly (p-dioxanone) / polytetrahydrofuran multi-block copolyether ester with shape memory function. The repetitive structure of the copolyether ester is shown in the specification, the intrinsic viscosity is 0.54-3.5dl / g, the shape fixed rate Rf is 82.6-100% and the shape recovery rate Rr is 84.9-100%. The invention also discloses a preparation method of the multi-block copolyether ester. The multi-block copolyether ester provided by the invention simultaneously has the advantages of shape memory function, controlled thermal transition temperature, controlled molecular weight, biodegradability, etc and has wide application prospect. The preparation method provided by the invention is simple, convenient and mature and has easily controlled process.

Disclosed is an absorbent laminated sheet which has excellent absorption properties, such as liquid-retaining ability, liquid-diffusing ability and capacity of holding absorbed liquid, and is highly resistant to deformations, in particular, crinkles, wrinkles and so on. The absorbent laminated sheet, which comprises a first sheet layer located in an absorption side, a second sheet layer located in a non-absorption side and a high water-absorbing polymer layer located between the first sheet layer and the second sheet layer, is characterized in that the first sheet and / or the second sheet comprise a bulky paper and said bulky paper contains heat-expandable particles that have been dispersed in the bulky paper and expanded by heating.

A preparation method of a shape memory high polymer material based on thermoplastic vulcanizate comprises steps as follows: (1) a sample of ethylene-vinyl acetate copolymer / nitrile rubber thermoplastic vulcanizate is fixed on a simple tensile fixture and preheated; (2) external force is applied, so that the preheated thermoplastic vulcanizate sample deforms and then is soaked in an ice-water mixture to be set, and the distance between scale marks is recorded; (3) external force is removed, the sample is naturally placed at the room temperature for 24 hr, and the distance between scale marks isrecorded; (4) the thermoplastic vulcanizate sample in (3) is put in a heating temperature, and the distance between scale marks is recorded; (5) the SF (shape fixed rate) and the SR (shape recovery rate) of the thermoplastic vulcanizate are calculated. The prepared shape memory high polymer material based on thermoplastic vulcanizate has the advantages of being low in hardness, good in flexibility, easy to form, recyclable and low in switch temperature and is expected to be applied to sensors and self-assembly equipment.

The purpose of the present invention is to provide an alumina fiber, and an alumina fiber aggregate constituted from such fiber, that even in harsh usage environments maintains elasticity over long periods of time and can secure a honeycomb carrier. The alumina fiber has an alumina content of 70%-98% by mass, a silica content of 2%-30% by mass, an average fiber diameter of 3.0-8.0 µm or less, and a ratio of fibers with fiber diameters exceeding 10 µm of 5% or less in terms of number of fibers. The size of mullite crystallites contained in each fiber is 10-1500 Å. By using such fibers to form the alumina fiber aggregate, problems with a retainer material for a honeycomb carrier for an automobile are solved.

The invention discloses a food plastic packaging barrel molding and blanking mechanism. The mechanism comprises a mounting base, a cooling channel is arranged above the mounting base, and an air cooler is arranged on the cooling channel; a conveyor belt device is horizontally arranged in the cooling channel in a penetrating mode, a vertical blocking piece is installed on the upper edge at the upper end of a guide channel, an obliquely-placed collecting box is arranged on one side at the lower end of the guide channel, and a vibration counter and an alarm are installed on a limiting baffle. According to the invention, plastic packaging barrels can be cooled in the cooling channel before cartonning to ensure a good molding recovery state, cold air in the refrigeration channel forms a circulating state and is in full contact with the surfaces of the plastic packaging barrels, so that the cooling efficiency is greatly improved; the plastic packaging barrels are laid down through the blocking piece, and sequentially falls into the obliquely-arranged collecting box along the guide channel and are stacked in sequence, full box monitoring is conducted through the vibration counter and thealarm, the operation is easy, the falling and cartonning efficiency is high, manpower is saved, and the working efficiency is improved.

The invention discloses a biodegradable cryogel dressing as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. Amino compounds are selected as main components, and the selected amino compounds have good biocompatibility and can be degraded in organisms. Therefore, the amidation reaction of amino and carboxyl in the amino compound is catalyzed by EDC hydrochloride and NHS to form a basic network structure of the cryogel. The cryogel dressing is holes communicating with each other in a free state, compared with the cryogel dressing in a shape free state, the cryogel dressing in a shape fixed state is a collapsed and closed hole, but a cryogel dressing sample still keeps an undamaged network structure. The preparation method disclosed by the invention is simple and low in cost, the biodegradable cryogel dressing is easy to carry and biodegradable, and the prepared cryogel dressing can be used for quickly stopping bleeding andhas huge potential in serving as a novel hemostatic for promoting wound healing.

The invention discloses a preparation method of a polymer nanocomposite with shape memory. According to the preparation method, a polystyrene-polyethylene / butane-polystyrene triblock copolymer SEBS is melt-blended with polycaprolactone PCL, and grafted maleic anhydride SEBS-g-MA and nano organic montmorillonite OMMT are added to modify a shape memory polymer composite so as to control the shape memory and deformation restoration capabilities of the polymer nanocomposite. The preparation method comprises the following steps: uniformly mixing the SEBS with extending oil at a mass ratio of 1:1 and placing for 24 h to obtain oil extended SEBS; blending the oil extended SEBS with the polycaprolactone PCL; adding the grafted maleic anhydride SEBS-g-MA and the nano organic montmorillonite OMMT and uniformly stirring to obtain a premixed sample; placing the premixed sample in a banburying chamber of a torque rheometer and carrying out melt-blending at 195 DEG C and 120 rpm for 15 min; and carrying out hot briquetting on the prepared sample in a hot press to obtain the polymer nanocomposite with shape memory. The preparation method provided by the invention is simple; the material has shape memory and favorable restoration rate and can be repeatedly used.

The present invention aims to prevent cutting of a dicing sheet, damage to a chuck table and fusion bonding of a dicing sheet to a chuck table by laser light during laser dicing. Specifically disclosed is a laser dicing sheet which is characterized by being composed of a base made of a polyurethane acrylate and an adhesive layer formed on one side of the base.

A preparation method of a shape memory high polymer material based on thermoplastic vulcanizate comprises steps as follows: (1) a sample of ethylene-vinyl acetate copolymer / nitrile rubber thermoplastic vulcanizate is fixed on a simple tensile fixture and preheated; (2) external force is applied, so that the preheated thermoplastic vulcanizate sample deforms and then is soaked in an ice-water mixture to be set, and the distance between scale marks is recorded; (3) external force is removed, the sample is naturally placed at the room temperature for 24 hr, and the distance between scale marks isrecorded; (4) the thermoplastic vulcanizate sample in (3) is put in a heating temperature, and the distance between scale marks is recorded; (5) the SF (shape fixed rate) and the SR (shape recovery rate) of the thermoplastic vulcanizate are calculated. The prepared shape memory high polymer material based on thermoplastic vulcanizate has the advantages of being low in hardness, good in flexibility, easy to form, recyclable and low in switch temperature and is expected to be applied to sensors and self-assembly equipment.

The invention provides high-temperature-resistant long-service-life shape memory polyimide and a preparation method thereof, and relates to polyimide and a preparation method of the polyimide. The invention aims at solving the problem that no long-service-life shape memory polyimide with the Tg exceeding 230 DEG C and the use times exceeding thousands of times exists in the prior art. The high-temperature-resistant long-service-life shape memory polyimide has a structural formula shown as the accompanying drawing. The preparation method comprises the following steps of 1, preparing a diamine solution; 2, preparing anhydride end sealing molecular weight polyamic acid; 3, preparing bubble-free viscous sol-gel; 4, performing gradient temperature rise to obtain the high-temperature-resistant long-service-life shape memory polyimide. By using the method, the high-temperature-resistant long-service-life shape memory polyimide can be obtained.

The invention provides a spiropyran-containing photo-induced shape memory color-changing polymer and a preparation method thereof, belonging to the technical field of functional polymer preparation. The preparation method of the spiropyran-containing photo-induced shape memory color-changing polymer comprises the following steps: The polyether polyol or polyester polyol is reacted with diisocyanate to obtain a prepolymer 1 terminated with isocyanate; a chain extender is added to the prepolymer 1, and a chain extension reaction is carried out to obtain a polyurethane polymer; The polyurethane polymer reacts with the spiropyran to obtain the photo-induced shape memory color-changing polymer containing the spiropyran. Compared with the prior art, the spiropyran-containing photochromic polymer of the present invention has both the photoinduced shape memory effect and the photochromic effect, that is, the spiropyran-containing photochromic photochromic polymer has excellent performance. The shape fixation rate, shape recovery rate and discoloration rate can be widely used in information storage, anti-counterfeiting, flexible camouflage robots and other fields.

The invention relates to a medical infusion pump which comprises a support housing, wherein an infusion tube is arranged in the support housing; the support housing in the length direction of the infusion tube is set as the longitudinal direction; and the support housing in the radial direction of the infusion tube is set as the transverse direction. The medical infusion pump is characterized in that the medical infusion pump further comprises at least three pressure fingers arranged in the longitudinal direction, wherein straight tooth structures are arranged on the two transverse sides of part or the whole of the pressure fingers; a pair of support shafts is longitudinally and fixedly arranged on the two sides of each straight tooth structure; the support shafts are rotationally connected with a plurality pairs of linked power-assisted arms; a round tooth structure is arranged at one end of each linked power-assisted arm; the round tooth structures are correspondingly meshed with the straight tooth structures; when the pressure fingers are far away from the infusion tube, the round tooth structures drive one corresponding pair of linked power-assisted arms to rotate inwards, and when the pressure fingers are the furthest from the infusion tube, transverse space between centers of head parts of a pair of linked power-assisted arms is equal to or approximately equal to the outer diameter of the infusion tube; and when the pressure fingers are close to the infusion tube, a pair of linked power-assisted arms rotates outwards, and the heads of the linked power-assisted arms depart from the infusion tube.

The invention relates to a packing material for a hatch cover, and more specifically relates to a packing material for a hatch cover, which is hollow inside and thus can elastically absorb loads. The packing material for a hatch cover is characterized by comprising a first part and a second part. The first part is formed into an outer frame with a hollow inside, any one face of the upper face and the lower face is open, is made of a first rubber material, and performs elastic deformation with combination with a pressure lever of the hatch cover. The second part is formed inside the first part and is made of a second rubber material. The second part has the following forms by comprising more than two hollow structures and more than one post between the hollow structures. Therefore, according to the packing material, a shape restoration ratio can be improved through the hollow structures inside the packing material; the packing material is made by a continuous vulcanization method and can have stable cross sections, and the time for manufacturing process can be shortened when the continuous vulcanization method is compared with conventional injection moulding methods.

The invention discloses a material storage disc of an LCD and a production process of the material storage disc, and relates to the technical field of display screen storage equipment. The material storage disc comprises a material storage disc body, the material storage disc body comprises a material storage area in the center and a stacking area arranged on the outer edge of the material storage area, adjustable fastening mechanisms are arranged at the positions, located on vibration buffering pads, in liquid crystal display screen containing cavities, and air bag vibration reduction mechanisms used for relieving shaking of the LCD are arranged in the material storage area. According to the material storage disc, stable clamping and fixing of the LCD are achieved, meanwhile, shaking and vibration generated in the taking, placing and carrying processes are relieved, and the stability of the LCD in the material storage process is improved. The production process comprises the steps of material preparation of the material storage disc body, injection molding, cooling demolding, installation of the adjustable fastening mechanisms, installation of the air bag vibration reduction mechanisms and installation of handheld parts, harsh conditions are not needed, the strength, elasticity, ventilation and heat dissipation performance of the material storage disc are guaranteed, and the material storage disc is suitable for large-scale production.

The invention relates to a shape self-repairing wave-absorbing material and a preparation method thereof. The method includes: (1) uniformly mixing a resin matrix, a toughening agent and a curing agent with a mass ratio of 1:(0.02-0.33):(0.01-0.017) to obtain a resin prepolymer, and the resin matrix is ​​selected from epoxy A group consisting of resin, polyurethane resin, polystyrene resin and polynorbornene resin; (2) adding ferrite powder, carbonyl iron powder, conductive carbon black, carbon fiber, silicon carbide to the obtained resin prepolymer fiber, carbon nanotubes and graphene and stir evenly to obtain a shape self-repairing absorbing resin; (3) curing the shape self-repairing absorbing resin at two or more different temperature stages to obtain a shape self-repairing absorbing resin Repair the absorbing material. The method of the invention endows the wave-absorbing material with shape self-repairing performance, and can meet the requirement of recovering the wave-absorbing performance of the wave-absorbing material after being damaged and deformed by an external force.

The invention provides a plastic particle and a yarn, the plastic particle includes shape-memory polyurethane, polyurethane and a polyurethane-type dispersant, wherein the shape-memory polyurethane is formed by the following steps: polymerizing a diisocyanate and a polyol to form a polymer, and The polymer is polymerized with a chain extender to form shape memory polyurethane. The yarn is made of the plastic pellets. The plastic particles and yarns have shape memory properties, and have good shape fixation rate, shape recovery rate, textile processability and textile applicability.

The invention relates to a cardiovascular blood flow velocity sensor, which comprises a cardiovascular bracket and a flow velocity sensor. The cardiovascular bracket is a tubular film. The flow velocity sensor is on the inside surface of the tube wall of the cardiovascular bracket. The flow velocity sensor comprises a substrate, the surface of which is coated with a coat. An electrode is arrangedat the upper side of the substrate. According to the cardiovascular blood flow velocity sensor disclosed by the invention, the production process is simple; the cardiovascular blood flow velocity sensor has good biocompatibility, higher mechanical flexibility and corrosion resistance and excellent self-expansion property; the cardiovascular blood flow velocity sensor is beneficial to working in human body stably for a long time; the real-time measurement of cardiovascular flow velocity is realized; and the problems urgently needed to be solved in clinic are solved.