52results about How to "High shape recovery rate" patented technology

The invention discloses a shape memory polymer alloy for fused deposition based 3D printing and a preparation method of the shape memory polymer alloy. The polymer alloy is prepared from raw materialsin percentage by weight as follows: 30%-50% of polyolefin plastics, 10%-40% of nylon resin, 20%-40% of thermoplastic elastomer graft, 0.1%-1% of a peroxide crosslinking agent, 0-5% of an assistant crosslinking agent and 1%-5% of a nanofiller. The raw materials mixed by a high-speed mixer are subjected to melt extrusion molding, and the polymer alloy suitable for fused deposition based 3D printingcan be obtained. The prepared polymer alloy has excellent 3D printing performance, so that a printed product has the characteristics of being low in warping degree, high in dimensional stability, better in mechanical property and heat resistance and the like and has a smooth surface without defects and an excellent thermally induced shape memory function, and the printed product are higher in shape fixed rate and shape recovery rate, and the application requirement of a shape memory product can be met.

The invention relates to thermosetting shape memory bismaleimide resin and a preparation method thereof. The preparation method comprises the following steps: adding cardo-polyetherketone into an allyl compound, and performing mixing for 15-35 min at temperature of 130-150 DEG C to obtain a clear liquid; adding bismaleimide and maleimide-endcapped hyperbranched polysiloxane into the clear liquid,and performing a reaction for 15-35 min at temperature of 130-150 DEG C to obtain a prepolymer; and performing defoaming treatment on the prepolymer at temperature of 130-150 DEG C, performing curing,and performing post treatment to obtain the thermosetting shape memory bismaleimide resin. Compared with thermosetting shape memory resin prepared in the prior art, the thermosetting shape memory bismaleimide resin provided by the invention has good processability, does not use a solvent, and has maximum molding (post-treatment) temperature of 240 DEG C; and in addition, the cured resin has highglass transition temperature (>270 DEG C) and initial decomposition temperature (>410 DEG C), high toughness and outstanding shape memory properties at the same time.

The invention provides a polyurethane memory foam material for a mattress as well as a preparation method of the material. The polyurethane memory foam material comprises the following raw material components in parts by mass: 40 to 60 parts of diisocyanate, 90 to 110 parts of poly-polyol, 10 to 15 parts of a chain extender, 5 to 10 parts of carbon fiber, 1.5 to 3 parts of a foaming agent, 1 to 2parts of a foam stabilizer, 0.5 to 1 part of a pore opening agent and 0.3 to 1 part of a catalyst, wherein the poly-polyol comprises low-molecular-weight poly-polyol with the number-average molecularweight of 800 to 1500, medium-molecular-weight poly-polyol with the number-average molecular weight of 3000 to 5000 and high-molecular-weight poly-polyol with the number-average molecular weight of 8000 to 12000. The polyurethane memory foam material is prepared by a method for performing polymerization foaming at one step and finally curing. The polyurethane memory foam material provided by the invention has high strength, has glass transition temperature close to the human body temperature, has high shape recovery ratio and is particularly suitable for a mattress material.

The invention relates to a bismaleimide-based thermosetting shape memory resin with high deformation and a preparation method thereof. Comprise the following steps, bismaleimide and 1,6-hexanedithiol are added in m-cresol to form a solution; triethylamine is added dropwise in the solution, and N 2 Under protection and stirring conditions, react at room temperature to obtain linear oligomers; by mass, mix bismaleimide, linear oligomers and O, O´‑diallyl bisphenol A at a temperature of 130 ~ React at 150°C for 25-45 minutes to obtain a prepolymer; vacuum defoam the prepolymer at a temperature of 130-150°C, and then undergo curing and post-treatment to obtain a thermosetting shape memory resin based on bismaleimide. Compared with the prior art, the resin of the present invention has a large deformability, and its elongation at break at the programmed temperature is greater than 30%. In addition, the cured resin combines high glass transition temperature (>131°C) and initial decomposition temperature (>370°C), high toughness and outstanding shape memory properties.

The invention discloses a method for repairing a tire inner liner, and relates to the technical field of tire repair. Including: S1: grinding and vacuuming the inside of the tire; S2: heating the polymer memory adhesive material into a liquid to obtain a liquid solution; S3: spraying the liquid solution obtained in step S2 on the inner wall of the tire, and naturally cooling to cool down to Below 50°C, tear off the sprayed polymer memory adhesive material layer, and finally spray the tire self-healing layer coating. The method improves the damage of the tire inner liner through the process of spraying and tearing off the polymer memory adhesive material, and solves the problem of micro-leakage of the tire. And the prepared polymer memory adhesive material has excellent mechanical properties, good shape memory properties, and has a good adsorption effect on release agents such as silicone oil.

The invention discloses elastic shape memory polyurethane, which is prepared through the following steps of: adjusting pH of 50g / L titanium dioxide nanosuspension to be 4.5 by using acetic acid and then ultrasonically dispersing for 30 minutes; adding 10g / L KH550 and heating to 80 DEG C to react for 3 hours; and finally, filtering a reaction product, washing with de-ionized water and then drying, and then crushing into fine grains to obtain modified titanium dioxide catalyst; and b, mixing the obtained modified titanium dioxide catalyst and DMAC (Dimethyl Acetylamide) and then dispersing under the action of ultrasonic wave to obtain catalyst suspension; adding ethyl acetate and MDI (Diphenyl-Methane-Diisocyanate) into a reaction kettle filled with nitrogen gas, heating to 40-50 DEG C, and adding a small amount of sodium methoxide and the catalyst suspension obtained by the step b after full dissolution; then slowly adding TMP (Trimethoprim); reacting at the temperature of 75 DEG C for 3-4 hours; and adding a small amount of phosphoric acid. The elastic shape memory polyurethane has high tensile strength and shape recovery rate.

The invention discloses a body-heat-excited polylactic-acid-base biodegradable shape memory material, and a preparation method and application thereof. The material is composed of the main components polylactic acid and thermoplastic elastomer in a mass ratio of (70-90):(30-10), and also composed of 10-40 phr of plasticizer. The preparation method comprises the following steps: mechanically mixing the main components into a premix, adding into an extruder, and carrying out melt blending to obtain the shape memory material. The shape memory material is used for manufacturing fixers for medical treatment. The shape recovery temperature of the polylactic-acid-base biodegradable shape memory material can be adjusted to near body temperature, thereby implementing the body-heat-excited effect. The shape memory material can be better applied to biological medical materials to greatly enhance the market competitiveness of the product.

The invention discloses a thermoplastic composition and a preparing method thereof.The thermoplastic composition comprises, by weight, 60-90 parts of epoxidation polyethylene-vinyl acetate, 10-40 parts of thermoplastic polymers and 0.1-20 parts of cross-linking agent.The preparing method of the thermoplastic composition can be achieved on a traditional high-polymer-material processing device, cost is low, the environment is friendly, and industrial production is easy to achieve.The thermoplastic composition obtained with the provided preparing method has the advantages of being high in shape recovery rate and strength, large in elongation at break, excellent in thermoplastic performance and the like, and can be directly used for extrusion molding, compression molding and the like to be used for preparing various thermoplastic and rubber products.

An object of the present invention is to provide a biodegradable material with improved shape recovery rate after material deformation and improved flexibility. The present invention provides a biodegradable material in which a polyvalent compound A having a functional group X such as three or more hydroxyl groups and a polyvalent compound B having a functional group Y such as three or more carboxyl groups are chemically cross-linked through a condensation reaction between the functional group X and the functional group Y. When the number of functional groups X not condensed with functional group Y is denoted as x, the number of functional groups Y not condensed with functional group X is denoted as y, the number of chemical crosslinks is denoted as z, and the number of polyvalent compounds A is When the weight average molecular weight is written as MA and the weight average molecular weight of the polyvalent compound B is written as MB, when MA≥MB, the value of (y+z) / (x+z) is 1.2 to 4.0, and when MA<MB, the The value of (x+z) / (y+z) is 1.2 to 4.0.