54results about How to "Has self-healing properties" patented technology

The invention provides a gel particle plugging agent with a self-healing characteristic. The gel particle plugging agent is prepared from the following raw materials in parts by mass: 15-35 parts of acopolymerization reaction monomer, 0.1-20 part of a surfactant A, 0.01-0.9 part of an initiator I, 0.01-0.1 part of a cross-linking agent and 0.5-5 part of cationic latex particles; wherein the copolymerization monomer comprises a hydrophilic monomer and a hydrophobic monomer, the hydrophilic monomer is a combination of acrylic acid and an acrylamide monomer, and the hydrophobic monomer is an acrylate monomer. The invention also provides a preparation method and a healing performance evaluation method of the gel particle plugging agent. The self-healing plugging material disclosed by the invention has the characteristic of recoverability after being damaged, is injected into stratum cracks in a particle form, and can form integral gel after being healed, so that the purpose of effectivelyplugging crack pores is achieved.

The invention relates to a hyperbranched elastic material capable of self-healing and a preparation method thereof. The preparation method comprises the following steps: reacting a first component containing double bond and carboxyl or ester group with a second component containing more than three amino groups at -20-50 DEG C for 1-72 hours; heating to room temperature to 200 DEG C, continuing the reaction under reduced pressure for 1-72 hours, precipitating the product, filtering, separating, and drying to obtain the hyperbranched polymer of which the molecular chain tail end is amino group; and reacting the hyperbranched polymer of which the molecular chain tail end is amino group with a third component (polybasic acid or polybasic acid mixture or carboxyl-terminated low polymer) at 80-280 DEG C for 1-120 hours to obtain the hyperbranched elastic material capable of self-healing. The hyperbranched material has elasticity at room temperature, and contains abundant amino and amido groups capable of forming reversible hydrogen bonds; and thus, the material has the characteristic of self-healing at room temperature, has thermoplastic property, and can be machined repeatedly.

The invention discloses a hole sealing grout stop material, which is a hole sealing grout stop material for guaranteeing grouting pressurization under the condition of loose permeable rock-soil body, high underground level or confined water. The hole sealing grout stop material is mainly prepared from clay primary grout, cement and sodium metaaluminate, wherein every 2 L of clay primary grout is mixed with 700-900 g of cement and 12.5-17.5 g of sodium metaaluminate. A grouting hole sealing process comprises hole sealing operation and grouting operation, wherein the hole sealing operation specifically comprises the following steps of: after forming a hole, dropping a grouting pipe to the bottom of the hole and mounting a orifice closer; opening the orifice closer and injecting the hole sealing grout stop material; closing the orifice closer and flushing the grouting pipe by using stable grout; and opening the orifice closer, performing grouting operation after solidifying the hole sealing grout stop material, and guaranteeing reliable hole sealing grouting through continuous lift grouting. The grouting hole sealing process has the advantages of simple steps, less equipment investment, high applicability, capabilities of guaranteeing the reliability of the hole sealing grout and increasing the grouting efficiency and the like.

The invention discloses a Mg(OH)2/Mg-Sn hydrotalcite composite film having an intercalation structure on the surface of magnesium and magnesium alloy and a preparation method thereof, relates to the technical field of the surface of magnesium and magnesium alloy, and aims to improve the corrosion resistance of magnesium and magnesium alloy and widen the application prospects in the fields of biological medicine and the like. The preparation method comprises the following steps: S1, initial treatment of magnesium and magnesium alloy; S2, pretreatment: preparing a Sn4<+> salt solution, regulating the pH value to 4.0 to obtain a pretreatment solution, and putting the magnesium and magnesium alloy in the pretreatment solution with continuously introduced CO2 to obtain a precursor film; S3, posttreatment: soaking the magnesium and magnesium alloy coated with the precursor film in a Na2CO3 solution to grow a Mg(OH)2/Mg-Sn hydrotalcite composite film on the surface of the magnesium and magnesium alloy; and S4, subsequent cleaning. According to the invention, the Mg(OH)2/Mg-Sn hydrotalcite composite film containing no aluminum and having biosafety is grown on the surface of magnesium and magnesium alloy in an in-situ generation manner through a two-step method; the corrosion resistance of magnesium and magnesium alloy is improved; and the application of the hydrotalcite film in biological magnesium alloy surface protection is widened.

The invention relates to an anti-freeze and self-repairing conductive nano-composite hydrogel fiber and a preparation method thereof. The fiber is obtained by performing synchronous extrusion-polymerization-stretching on a primary hydrogel, which has not been completely reacted, in an aniline monomer bath through a synchronous polymerization-stretching method. The conductive nano-composite hydrogel fiber with anti-freeze and self-repairing performances prepared by the invention is extensive in application range, low in preparation cost, and convenient for industrial production, and an effective new thought is provided for the designing or preparation of other conductive fiber or fabric.

The invention discloses a dry-type composite-dielectric filter capacitor, which comprises a capacitor core, a pin, and an encapsulation layer coated outside the capacitor core, wherein the capacitor core consists of a polypropylene film plated with a metallic layer and a metallized polyester film which are superposed in turn and are coiled in a non-inductive mode, the metallic layer is a zinc-aluminum composite layer, the metallized film has a 'natural repair' characteristic, small loss and large capacitance, the encapsulation layer is an epoxy resin solidified layer, thus not only the insulation strength of the capacitor is ensured, but also the safe use of the capacitor under a severe condition is ensured.

The invention discloses an assembling prestress orthogonal laminated wood shear wall. The assembling prestress orthogonal laminated wood shear wall comprises bond-free prestress bars, bearing beams, CLT wall plates, slab supporting frames and limiting steel components. The two limiting steel components are connected with a base. The CLT wall plates on the lower layer tightly abut against the basethrough the bond-free prestress bars. The bearing beams on the lower layer are connected with the CLT wall plates on the lower layer. The slab supporting frames on the lower layer are connected with the CLT wall plates on the lower layer and then put on the top of the bearing beams on the lower layer. The CLT wall plates on the upper layer are connected with the two slab supporting frames on the lower layer. The bearing beams on the upper layer are connected with the CLT wall plates on the upper layer. The two bond-free prestress bars penetrate through the CLT wall plates on the upper layer and the lower layer. The CLT shear wall has high initial rigidity, high ultimate bearing capacity and a certain self-recovery characteristic under lateral loads after the bond-free prestress bars are applied, and the common damage mode of weak joints and strong components of a common CLT shear wall is avoided. The assembling prestress orthogonal laminated wood shear wall is high in assembling degree, and prestress loss caused when CLT slabs have big creep deformation under the band stress action can be reduced obviously due to the arrangement of the slab supporting frames on the lower layer.

The invention discloses a microgel assembly scaffold for tissue regeneration and repair, and a preparation method thereof. The scaffold has injectability and can be used for minimally invasive treatment of tissue defects and promotion of tissue regeneration and repair. The preparation method of the microgel assembly scaffold comprises the following steps: respectively synthesizing a carbon-carbon double bond and phenylboronic acid dual-modified polymer material and a carbon-carbon double bond modified polymer material; preparing microgel liquid drops by adopting a microfluidic technology, and initiating free radical polymerization by blue light or ultraviolet light to realize internal crosslinking of microgel; and preparing dopamine modified polymer molecules, and assembling the microgel into the scaffold by utilizing a dynamic bonding effect constructed by phenylboronic acid and dopamine. The scaffold has porosity, self-healing property and cell compatibility, can be injected at physiological temperature, is easy to adhere to surrounding tissues, and shows a good tissue regeneration and repair effect.

The invention relates to injectable self-healing hydrogel with conductivity and a preparation method thereof. The method comprises the steps that firstly, a methacrylic anhydride modified natural polymer is adopted, then, pyrrole is added into a modified natural polymer solution, stirring is performed for 1-3 h, then, an initiator is added, and after a reaction is ended, dialysis and freeze dryingare performed to obtain a polypyrrole grafted natural polymer; then, the polypyrrole grafted natural polymer is dissolved into ultra pure water, and then, due to the Fe3+ cross linking effect, the injectable self-healing hydrogel with the conductivity is prepared. The prepared self-healing hydrogel has the advantages of conductivity and injectability, the hydrogel can be implanted into the body in a minimally invasive mode, the irregular defect part is restored, and meanwhile wound healing is promoted. The injectable self-healing hydrogel has the potential application prospect in the field ofbiology medicine materials.

The invention relates to a high-output self-healing single-electrode friction nano generator and a preparation method thereof, and belongs to the technical field of nano energy. The high-output self-healing single-electrode friction nano generator includes a wire, a triboelectrification layer which is in contact with the skin, and the cross-linking layer, the self-healing electrode layer and the supporting layer which hare sequentially located below the triboelectrification layer. The triboelectrification layer is a CNTs/PDMS composite film; the cross-linking layer is a mixture formed by PDMSand PMHS; the self-healing electrode layer is PVA hydrogel added with graphene and glycerin; the PDMS film serves as support layer. According to the nano-generator, graphene is added into PVA hydrogelto serve as a conductive reinforcing phase, meanwhile, crystal lattices are refined, and the mechanical property of the material is improved; glycerol is added, so that rapid self-healing can be realized in air; CNT is added into PDMS to serve as a reinforcing phase, so that the friction layer has high dielectric property, and the output of the friction nano generator is improved. The cross-linking agent enables the self-healing electrode layer and the friction layer to have good physical cross-linking.

The invention discloses self-healing anti-freezing conductive fibroin hydrogel and a preparation method thereof, and belongs to the field of flexible electronic materials. The preparation method comprises the following steps: firstly, modifying pyrrole by adopting dopamine, polymerizing in an acid environment to obtain dopamine modified polypyrrole, then taking MAX powder as a raw material, etching under hydrofluoric acid and hydrochloric acid to obtain an MXene material, then respectively adding the dopamine modified polypyrrole and the MXene material into a polyvinyl alcohol aqueous solution, uniformly mixing, then adding a fibroin aqueous solution, further mixing, and finally, preparing the modified polypyrrole/MXene composite material. And finally, dropwise adding a mixed aqueous solution of borax and glycerol into the mixed solution to prepare the self-healing anti-freezing conductive fibroin hydrogel. The self-healing anti-freezing conductive fibroin hydrogel has the advantages of self-healing, freezing resistance, air permeability and good conductivity, overcomes the three defects of no freezing resistance, no self-healing and non-uniform conductive material distribution of common fibroin hydrogel, and has a wide application prospect in the field of flexible electronic products.

The invention discloses preparation of nano-composite hydrogel ink and application of the nano-composite hydrogel ink in 3D printing. The preparation comprises the following steps: firstly, compounding a free radical initiator and an inorganic metal nano-material in a dynamic covalent bond mode to obtain a nano-composite; and then, in the presence of a polymerizable monomer, initiating a local rapid free radical polymerization reaction of the nano-composite to obtain the nano-composite hydrogel ink. The 3D printing of the ink is realized by taking dynamic coordination as a crosslinking mode and utilizing intermolecular chain and chain hydrogen bond interaction, and a 3D printing hydrogel model with self-repairing property, repeated recycling property, stretchability and excellent photo-thermal performance is prepared.

The invention belongs to the technical field of nuclear reactor materials, and discloses a treatment method for improving the corrosion resistance of a steel and iron material in lead or lead bismuth, the steel and iron material containing Mn element and Cr element is selected, high-energy fast neutrons generated by fission are adopted as an irradiation source, the steel and iron material is irradiated, and the corrosion resistance of the steel and iron material in lead or lead bismuth is improved. And the Mn element and the Cr element in the steel and iron material are diffused to the surface of the steel and iron material to form a compact oxidation film, and the corrosion resistance of the steel and iron material is improved. Formation of the oxidation layer with a compact structure is enhanced through irradiation, the oxidation layer has good protectiveness and has the self-repairing characteristic in the irradiation environment, and a new solution thought is provided for enhancing the corrosion resistance of the steel in the lead and lead bismuth coolant fast reactor.

The invention belongs to the field of automobile part manufacturing processes, and particularly relates to a rapid in-mold simulation surface decoration process. The forming process of an injection molding part comprises the following steps that a thermoplastic base material is subjected to injection molding in a first mold cavity through a rapid cooling and rapid heating process to form the highlight injection molding part, wherein nanometer or femtosecond laser textures are pre-machined on the inner surface of the first mold cavity so that the highlight injection molding part can have a nanometer or femtosecond laser texture structure; the first mold cavity is quenched and opened, a rotary table is approximately rotated by 180 degrees, and a second mold cavity is closed; the highlight injection molding part is directly cast and coated with a two-component coating in the second mold cavity, and the two-component coating reacts and is cured in the second mold cavity, so that a transparent coating is formed on the surface of the highlight injection molding part; and the second mold cavity is cooled and opened, and the highlight injection molding part with the nanometer or femtosecond laser texture structure and the scratch-resistant surface is formed. The rapid in-mold simulation surface decoration process has the obvious cost advantage, and the surface coating of the formed highlight injection molding part is attractive, ideal in hardness and good in scratch resistance; and in addition, due to the combination of the nanometer or femtosecond laser texture structure and the external transparent coating, the highlight injection molding part has a three-dimensional decorative effect on the whole, and the product has more advantages and competitiveness.

The invention discloses a curing agent containing a large-steric-hindrance urea bond as well as a preparation method and application of the curing agent. The method mainly comprises the following steps: dissolving bifunctional aromatic amine and alkali in a solvent, adding halogenated hydrocarbon at 70-85 DEG C, and reacting for 8-12 hours to obtain an intermediate product secondary amine; the preparation method comprises the following steps: adding diol and an anhydrous solvent into bifunctional isocyanate, and reacting at 50-60 DEG C for 2-6 hours to obtain a polyurethane prepolymer; and adding secondary amine and an anhydrous solvent into the polyurethane prepolymer, and reacting at 50-60 DEG C for 6-8 hours to obtain the large-steric-hindrance urea bond-containing curing agent. The prepared curing agent containing the large-steric-hindrance urea bonds can overcome the defects of other dynamic covalent bonds, and epoxy resin prepared based on the curing agent containing the large-steric-hindrance urea bonds is good in mechanical property, thermal stability and solvent-resistant chemical stability; the large-steric-hindrance urea bond-containing curing agent can also be used for preparing electronic packaging materials.

The invention provides a self-repairing air purifying gel and a preparation method thereof. The self-repairing air purifying gel comprises the following components in percentage by mass: 0.01-90% of essential oil, 0.01-50% of an air purifying agent, 1-10% of an oily gel agent, and 0.0001-0.2% of an oily pigment, with the balance being an oily solvent. According to the self-repairing air purification gel disclosed by the invention, aluminum isooctanoate or aluminum ions contained in aluminum isooctanoate and prepared by a reaction and high-electronegativity hydrocarbon chain segments in the oily solvent or essential oil form hydrogen bonds, so the gel is formed. A gel network with such a structure can realize self-crosslinking and self-repairing under the condition of normal temperature after being damaged and broken by external force, so the gel network has a self-repairing characteristic; and a gel state is not influenced by extreme weather such as high temperature and low temperature. Furthermore, by adjusting the parameters of all the components of the liquid gel, the physical states such as the fluidity, the repair time and the viscoelasticity of the air purification gel can beadjusted.