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198results about How to "Improve mechanical strength" patented technology

Radar stealth and infrared stealth integrated stealth tarpaulin and making method thereof

The invention discloses radar stealth and infrared stealth integrated stealth tarpaulin and a making method thereof. The radar stealth and infrared stealth integrated stealth tarpaulin and the making method thereof are mainly used for achieving stealth of modern weapons such as vehicle-mounted guided missiles, tanks and aircrafts and improving the survival capacity, the defense penetration capacity and the deep strike capacity of the weapons. The integrated stealth tarpaulin comprises a camouflage layer, a radar and infrared integrated stealth layer and a base layer in sequence from outside to inside. The radar and infrared integrated stealth layer is formed by polymerizing silicon carbide fiber cloth and aniline in situ and has not only the wave absorption stealth performance but also antistatic property, high temperature resistance and flame retardant property. The surface of a radar absorption layer is coated with an infrared wave absorbing coating in a coating finishing mode. The tarpaulin is cut and sewn in a three-dimensional mode according to different application types. The integrated stealth tarpaulin can achieve the functions of radar stealth and infrared stealth at the same time, and has the advantages of being antistatic, flame-retardant, high in mechanical strength, flexible, wash-resistant and breathable, and convenient to produce.
Owner:SUZHOU IND PARK HIGH PERFORMANCE CERAMIC FIBER ENG CENT CO LTD

Method for improving mechanical properties of hydrogel fibers by secondary crosslinking

Provided is a method for improving mechanical properties of hydrogel fibers by secondary crosslinking. The invention discloses the method for improving the mechanical properties of the hydrogel fibers by secondary crosslinking, and the method is characterized by comprising the steps: preparing a monomer aqueous solution, stirring evenly, then adding a UV initiator with good water solubility, stirring to dissolve completely under a room temperature light-shielding condition, and thus obtaining a spinning prepolymerization solution; extruding the spinning solution from a spray nozzle into water bath through a metering pump, arranging an ultraviolet light point source at an outlet of the spinning solution, under ultraviolet light irradiation, carrying out a free radical polymerization reaction of the dynamically extruded spinning solution monomer, to obtain a hydrogel as-formed fiber; and immersing the as-formed fiber in a water soluble thermal initiator solution prepared in advance, increasing the temperature, and decomposing a thermal initiator to trigger a double-bond containing polymer chain in the as-formed fiber to generate secondary crosslinking, so as to improve the mechanical properties of the gel fiber and expand the application field of the hydrogel.
Owner:DONGHUA UNIV

Light degradation antibiotic polylactic acid material and preparation method thereof

The invention relates to a composite material of light-degradation antibiotic polylactic acid, which mainly comprises polylactic acid and nanometer TiO2, wherein, the content of polylactic acid is 90.0% to 99.0%, the content of nanometer TiO2 is 1.0%to 10.0%. The process for preparation comprises adding coupling agent to flow back for 2-4 hors under the temperature of 80 DEG C+-10 DEG C after dispersing nanometer TiO2 in methyl ethyl ketone, acetone or triethylamine disperser in ultrasonic, placing in a straight sealing tube with lactide after whizzing and drying, adding accelerating agent, and preparing in 150 DEG C +- 10 DEGC vacuum to polymerize for 2-4 hours. Compared with polylactic acid, the heat decomposition temperature, the glass transformation temperature and mechanical properties of the invention are all greatly improved, and the invention has the functions of antibacterial activity and ultraviolet absorption, the degradation rate is obviously accelerated under the radiation of ultraviolet light and natural conditions, and the invention has complete biodegradability. The composite material of light-degradation antibiotic polylactic acid of the invention adopts an in-situ polymerization, whose processing technology is simple, production cost is low, and application prospect is wide.
Owner:NANJING UNIV

Preparation method of corn alcohol-soluble protein nanofiber membrane used for cell culture

The invention discloses a preparation method of a corn alcohol-soluble protein nanofiber membrane used for cell culture. The corn alcohol-soluble protein/polyvinyl alcohol nanofiber membrane is a cell culture carrier material, which comprises biodegradable natural polymer corn alcohol-soluble protein and polyvinyl alcohol as a biocompatible high polymer. The transverse dimension of a ribbon-like corn alcohol-soluble protein/polyvinyl alcohol nanofiber is 625 to 3,920 nanometers; and the nanofibers are stacked into the nanofiber membrane randomly. The corn alcohol-soluble protein/polyvinyl alcohol nanofiber membrane is made through electrostatic spinning process, the preparation method is simple and effective, preparation equipment is simple, the stability is high, and indexes such as the diameters of the nanofibers and the porosity of a membrane material and the like can be regulated through changes of the condition of the electrostatic spinning process. The experiment proves that compared with a common PC (polycarbonate) plate, the corn alcohol-soluble protein nanofiber membrane material contributes to proliferation of mouse embryonic stem cells, and the diameter of the stem cell clone cultured for 5 days reaches 100 micrometers. Moreover, the nanofiber membrane can be recycled after being steamed and pressed for 30 minutes at 120 DEG C.
Owner:JILIN UNIV

High-performance structural adhesive for reinforcement project with water environment and preparation method of high-performance structural adhesive

The invention discloses a high-performance structural adhesive for a reinforcement project with water environment and a preparation method of the high-performance structural adhesive. The structural adhesive is prepared from a component A and a component B, wherein the mass ratio of the component A to the component B is (2 to 1) to (3 to 1). The component A consists of nano silica grafted modifiedepoxide resin, epoxy active diluent, an elastomeric modifier, water-absorbent resin, a defoaming agent, a dispersing agent, active silica powder, cement, calcium sulfate whisker, organic montmorillonite and a thixotropic agent; the component B consists of a compound amine curing agent, a curing accelerator, a coupling agent, the defoaming agent, the dispersing agent, the active silica powder, thecement, the calcium sulfate whisker, the organic montmorillonite, the thixotropic agent and the carbon black. The high-performance structural adhesive for reinforcement projects with the water environment, disclosed by the invention, has the advantages of high bonding strength of water interface, high mechanical strength, good toughness, excellent impact resistance and high fatigue resistance, good construction performance and the like; the bonding effect and durability of the structural adhesive in the reinforcement projects with water environment can be remarkably enhanced; in addition, thepreparation method of the high-performance structural adhesive is especially suitable for meeting glue demands of a hydraulic structure reinforcement and restoration project.
Owner:山西省交通科技研发有限公司
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