176 results about "Disulfide bond" patented technology

The invention provides a preparation method of a self-repairing resin-based composite material based on dynamic bonds. The self-repairing epoxy resin comprises one covalent dynamic bond of a Diels-Alder bond, a disulfide bond or a borate bond, and the preparation method of the self-repairing epoxy resin comprises the following steps: heating epoxy resin to a molten state, adding a curing agent component while stirring, and carrying out a prepolymerization reaction to obtain a prepolymer; the curing agent comprises a rigid diamine curing agent, a dynamic diamine monomer and a flexible chain segment regulator, and the dynamic diamine monomer contains a dynamic covalent bond; and carrying out curing molding on the prepolymer to obtain the self-repairing epoxy resin. And impregnating reinforced fibers or fabrics thereof with the prepared prepolymer, and heating and curing to obtain the self-repairing resin-based composite material. The invention provides a chemical molecule design, dynamic reversible chemical bonds are introduced into a resin matrix, and by constructing the dynamic bonds, the composite material has high performance of a traditional composite material and also has life-like self-healing ability.

The invention discloses a preparation method and application of a ceramic glaze layer protecting and repairing material, and belongs to the technical field of cultural relic protection. The preparation method comprises preparation of a core-shell self-repairing nanocapsule, and the preparation of the core-shell self-repairing nanocapsule comprises the following steps: reacting a calcium chloride solution with a sodium hydroxide solution, then adding sodium polyacrylate and nano ZnO, and carrying out dispersion, centrifugation, washing and other operations to prepare the nano Ca (OH) 2-ZnO composite material. The nano Ca (OH) 2-ZnO composite material of the core-shell self-repairing nanocapsule can be rapidly released through the 3.5 nm aperture of the mesoporous SiO2 shell, glaze layer cracks are physically filled and react with CO2 in air to generate CaCO3 crystals, crack plugging is achieved, meanwhile, dynamic disulfide bonds of a PU layer are broken and recombined under stress stimulation, a crack interface is repaired through chemical bonding, and the performance of the core-shell self-repairing nanocapsule is improved. The 24-hour crack repair rate is greater than or equal to 96%, and the limitation of'one-time repair 'of a traditional material is solved.

The invention provides a lithium ion battery binder for inhibiting silicon expansion, a negative pole piece, a lithium ion battery and an electric device, and relates to the technical field of lithium ion batteries. The lithium ion battery binder capable of inhibiting silicon expansion comprises a first polymer and a second polymer, wherein the first polymer is a cross-linked polymer with dynamic reversible covalent bonds; wherein the dynamic reversible covalent bond comprises a disulfide bond or a borate bond; the binder network provided by the invention not only can effectively limit the excessive slippage of a polymer and provide higher mechanical strength, but also can generate reversible fracture and recombination at a stress concentration point in the charging and discharging process due to the dynamic reversibility of a disulfide bond or a borate bond, converts concentrated stress into fracture energy of a chemical bond and dissipates the fracture energy, so that the mechanical strength of the polymer is improved, and the service life of the polymer is prolonged. Therefore, permanent damage of the network is avoided, the pole piece structure is kept complete in long-term circulation, and stable electrochemical performance is achieved.

The invention provides a bio-based super-hydrophobic coating magnesium alloy material with anti-icing and corrosion-resistant functions as well as a preparation method and application of the bio-based super-hydrophobic coating magnesium alloy material. According to the material, a polylipoic acid-metal ion-hydrophobic carbon black coating is constructed on the surface of the pretreated magnesium alloy, so that the key problems that the corrosion rate of the magnesium alloy is high and the surface of the magnesium alloy is easy to freeze in practical application are solved. The coating is firmly combined with a matrix through multiple hydrogen bond effects, and the coating is endowed with rapid self-repairing capability by virtue of synergistic dynamic effects of disulfide bonds, hydrogen bonds and metal coordinate bonds. And meanwhile, the doped hydrophobic carbon black particles obviously improve the surface super-hydrophobic performance. The self-repairing characteristic is combined with the super-hydrophobic structure, so that corrosion medium infiltration is effectively blocked, and the corrosion process of the magnesium alloy is greatly delayed. In addition, the coating has photo-thermal and electrothermal effects, active anti-icing and efficient deicing can be achieved, and the application potential of the magnesium alloy in a severe environment is remarkably expanded.

The invention relates to the technical field of biomedical material modification, in particular to a sulfhydrylation biocompatible polymer derivative, a preparation method thereof, extracellular matrix imitating injectable in-situ cross-linked hydrogel and application thereof. According to the invention, a pre-acylation strategy is firstly carried out on the biocompatible polymer containing both amino and carboxyl, so that a three-dimensional cross-linked byproduct formed by coupling of self amido bonds is avoided, meanwhile, the number of side chain carboxyl for sulfhydrylation modification is increased, and the accurate and adjustable pre-acylation rate can optimize the physical and chemical properties of the derivative; meanwhile, a disulfide bond is used as a protective precursor, active sulfydryl is introduced through amido bond coupling, self-oxidation of the active sulfydryl in the reaction process is avoided, sulfydryl activity is guaranteed, hydrazine-containing reagents are avoided, safety is further improved, virus residues and immunological rejection risks are avoided, universality is high, and the application prospect is wide; and in combination with a high-concentration preparation method, the method has the advantage of large-scale production, and further widens the industrial application potential.

The invention provides vitamin B12 modified microspheres capable of efficiently loading His tag recombinant protein as well as a preparation method and application of the vitamin B12 modified microspheres, and belongs to the technical field of biological medicines. The preparation method of the vitamin B12 modified microsphere for efficiently loading the His tag recombinant protein comprises the following steps: (1) carrying out esterification reaction on unsaturated fatty acid containing sulfydryl, disulfide bond or olefinic bond, saturated fatty acid and vitamin B12 to prepare an amphiphilic vitamin B12-lipid conjugate; and (2) taking the amphiphilic vitamin B12-lipid conjugate, PLGA (poly (lactic-co-glycolic acid)), a multi-sulfydryl cross-linking agent and a photoinitiator as raw materials, and preparing the raw materials into microspheres by adopting a microfluidic method, so as to obtain the vitamin B12 modified microspheres capable of efficiently loading various His tag recombinant proteins. The microsphere provided by the invention overcomes the problems of protein load stability and burst release of traditional microspheres, and various different His tag recombinant growth factors can be flexibly selected according to the requirements on different growth factors in treatment of complex bone defects caused by different pathogenesis.

The invention belongs to the technical field of coatings, and particularly relates to textured high-toughness polyester resin as well as a preparation method and application thereof. The textured high-toughness polyester resin is prepared from the following raw materials: polyol, polyacid, carboxyl silicone oil, a dynamic cross-linking agent, an acidolysis agent and carboxyl-terminated nitrile rubber. The dynamic cross-linking agent contains at least two carboxyl groups and one disulfide bond. Through the synergistic effect of the dynamic cross-linking agent, the carboxyl silicone oil and the carboxyl-terminated nitrile rubber, the problem that a traditional texture type powder coating is insufficient in toughness is solved, and the impact resistance, the flexibility, the low-temperature mechanical property and the self-repairing capacity of a coating are remarkably improved while clear textures are kept.

The application discloses a drug-loaded micelle capable of effectively crossing the blood-brain barrier, which is an amphiphilic conjugate composed of a reduction-sensitive paclitaxel prodrug and a nucleic acid complex, wherein the reduction-sensitive paclitaxel prodrug is used as a hydrophobic part, and the nucleic acid complex is used as a hydrophilic part, and the drug-loaded micelle is self-assembled in an aqueous environment; the reduction-sensitive paclitaxel prodrug is formed by the reaction of paclitaxel and a disulfide bond-containing linker; and the nucleic acid complex is formed by connecting an antisense oligonucleotide and an interfering RNA through a DNA bridge. The drug-loaded micelle exhibits superior blood-brain barrier penetration, effectively realizes enrichment in brain tumors, solves the problem of low blood-brain barrier penetration efficiency of existing nano-carriers, and provides an effective basis for brain drug delivery and brain diseases such as brain tumor imaging and treatment.

The invention discloses a high-thermal-conductivity self-adhesion thermal interface material and a preparation method thereof, and is characterized in that polylipoic acid (polyTA) formed by high-temperature ring opening polymerization of lipoic acid (LA) is used as a dynamic reversible polymer matrix, the dynamic reversible polymer matrix has the characteristics of recoverability, self-healing and adhesion due to the inherent dynamic property of disulfide bonds, a spherical thermal conductive filler is modified by a polyphenol compound, and the high-thermal-conductivity self-adhesion thermal interface material is prepared. Polyhydroxy functional groups are given, the surface energy is reduced, meanwhile, certain viscosity is achieved, polyethylene glycol diacrylate is added to serve as a stabilizer, ferric iron salt is evenly stirred and mixed, the reaction time is controlled, and a stable cross-linked network system is constructed. Hydroxyl groups on the surface of the polyphenol-decorated heat-conducting filler and carboxyl groups in polylipoic acid are subjected to esterification reaction, and meanwhile, Fe < 3 + > and the carboxyl groups in the polylipoic acid form supramolecular coordination, so that uniform dispersion and stable bonding of the filler in a matrix are realized, the interface thermal resistance is remarkably reduced, and a continuous heat-conducting passage is formed. The preparation method of the thermal interface material is simple in process, and the thermal interface material has high thermal conductivity and self-adhesion, has soft elasticity and is suitable for various application fields needing efficient thermal conduction and interface thermal management.

This invention relates to the field of catalyst technology, specifically to a latent epoxy resin curing catalyst with precisely controllable activity and its preparation method. The catalyst is 1-(2-(N-tert-butyl-N'-phenylurea)ethyl)-3-(2-(phenyldithio)ethyl)imidazolium, which simultaneously possesses an imidazolium ring catalytic active center, a thermally hindered urea bond, a temperature-responsive dynamic disulfide bond, and an intramolecular hydrogen bond unit. Precise control of catalytic activity is achieved through the synergistic effect of these triple dynamic bonds. The catalyst exhibits excellent storage stability at room temperature, rapid curing at activation temperature, and is free of metal ions. The cured epoxy resin exhibits good dielectric properties. This invention's catalyst achieves a balance between excellent latency and rapid curing performance through the synergistic control of these triple dynamic bonds. It possesses excellent dielectric and mechanical properties, can be compounded with various curing agents, and its preparation method is simple and easy for industrial production.

The invention discloses an exosome slow-release oral soluble film based on enzyme triggering and a preparation method thereof. The oral soluble film comprises a film forming substrate, a plasticizer, a disintegrating agent, mucous membrane adhesion type enzyme-sensitive nanogel and a stable protection component. Wherein the mucous membrane adhesion type enzyme-sensitive nanogel has a three-layer functional structure: an enzyme-sensitive cross-linking core is formed by maleimide starch through gradient cross-linking, and alpha-1, 4 glucosidic bonds on a starch chain can be hydrolyzed by saliva alpha-amylase; the phospholipid-exosome composite layer is located on the surface of the core, and efficient embedding of the exosome is achieved through a pre-fusion-cold locking process; the mucous membrane adhesion layer is made of thiolated mucous membrane adhesion materials and can form disulfide bonds with oral mucosa. Self-regulation slow release insensitive to saliva alpha-amylase concentration fluctuation is realized through a gradient cross-linked structure, the problems of exosome activity loss, uncontrollable release and weak adhesion are effectively solved, and the exosome is suitable for treatment of oral mucosa diseases.

The application discloses an active oxygen response type bacteriostatic and repair promoting hydrogel and a preparation method and application thereof, the hydrogel is formed by disulfide bond cross-linked hydrogel in response to active oxygen free radicals in the vagina of vaginitis patients through thiol modified hyaluronic acid (HASH), and can enhance in-vivo retention by thiol and vaginal tissue interaction. Cationic surfactant such as didecyldimethylammonium chloride (DDAC) as the bacteriostatic component of the hydrogel, efficiently killing pathogenic bacteria while having good biocompatibility, and is not prone to cause bacterial drug resistance. As a natural immune regulator, beta-glucan regulates the vaginal microenvironment, promotes the polarization of macrophages into anti-inflammatory M2 type and promotes cell migration, etc., to promote the repair of the vaginal immune barrier, regulate the vaginal flora, and reduce the probability of vaginitis recurrence. The HASH hydrogel provides an efficient, convenient and highly transformative potential strategy to provide more choices for the treatment of vaginitis.

The invention discloses a flame-retardant wear-resistant epoxy resin cable material and a preparation method thereof, and relates to the technical field of cable sheaths and insulating materials. The formula comprises bisphenol A epoxy resin, a curing agent, a hyperbranched polymer, a reactive nano mica sheet, phosphorus-nitrogen flame-retardant core-shell microspheres, an accelerant and a wetting dispersant. According to the invention, the technical contradiction that the toughness, wear resistance and flame retardance of the epoxy resin are difficult to synergistically improve is effectively improved by using the three self-prepared components, namely the hyperbranched polymer containing the dynamic disulfide bond, the nano mica sheet of which the surface is grafted with the liquid crystal unit and the phosphorus-nitrogen flame-retardant microsphere with the core-shell packaging structure. The material disclosed by the invention has high toughness, high wear resistance and excellent flame retardance while keeping good processability and electrical insulating property, and is suitable for sheaths and insulating layers of high-performance cables.

The invention belongs to the technical field of materials, and particularly relates to a coating composition as well as a preparation method and application thereof. The coating composition provided by the invention comprises the following components in parts by weight: 30-50 parts of six-functionality polyurethane acrylic resin; the coating is prepared from the following components in parts by weight: 2-4 parts of a photoinitiator, 20-40 parts of a polycaprolactone type polyurethane prepolymer containing disulfide bonds (-S-S-), 3-8 parts of nano silicon dioxide, 0.1-0.5 part of a flatting agent, 0.1-0.5 part of a defoaming agent, 2-4 parts of an ultraviolet light absorber, 2-4 parts of a light stabilizer and 25-35 parts of a solvent. The prepared coating has extremely high elongation at break and toughness, can realize perfect synergistic deformation with a TPU base material, and is excellent in self-repairing capability and durability and long in service life.

The application belongs to the technical field of TPU and its preparation, and particularly relates to a kind of TPU material for simulating robot skin and a preparation method thereof.The TPU material comprises the following raw materials by weight fraction: diisocyanate 16-32.1 parts; polyether polyol 48-74 parts; silicone modifier 6-12 parts; mixed chain extender 4-11.4 parts, wherein one chain extender contains a disulfide bond; carbon nanotube 0.2-0.5 parts; coupling agent 0.1-0.5 parts; hydrolysis stabilizer 0.3-1 parts; catalyst 0.5-1 parts; the number average molecular weight of the polyether polyol is 2000-3000.The TPU material prepared by the application can have excellent skin affinity and rapid self-repairing performance, and can completely retain the inherent high mechanical strength and wear resistance of TPU material; the application also provides a preparation method of the material, which is simple in process and easy to operate.

The invention discloses a preparation method of photo-thermal double-excitation self-repairing rubber modified asphalt, and belongs to the technical field of road engineering materials. The method comprises the following steps: firstly, dissolving 8.8-10 parts by weight of 2, 2 '-diaminodiphenyl disulfide and 10-12 parts by weight of vanillin in ethanol, carrying out reflux reaction at 80-85 DEG C for 8-12 hours, and washing and drying to obtain a double-dynamic covalent cross-linking agent with disulfide bonds and imine bonds; secondly, carrying out internal mixing and hot press molding on 90-110 parts by weight of epoxidized natural rubber with the epoxy value of 50 and 4-8 parts by weight of the cross-linking agent, and crushing to obtain photo-thermal double-excitation self-repairing rubber particles; and finally, melting 100 parts by weight of matrix asphalt, adding 4-8 parts by weight of rubber particles in 3-5 times, and performing high-speed shearing at 175-180 DEG C for 30-40 minutes to obtain the modified asphalt. By constructing an imine bond-disulfide bond synergistic dynamic cross-linked network, the asphalt is endowed with excellent photo-thermal double-excitation self-repairing capacity, and meanwhile, the asphalt has good high and low temperature performance and mechanical strength.

The invention discloses a degradable environment-friendly flame retardant and a preparation method thereof, and relates to the technical field of flame retardant materials, the degradable environment-friendly flame retardant comprises a three-dimensional dynamic covalent network structure formed by cross-linking cystamine-syringaldehyde Schiff base and phytic acid-syringaldehyde ester; the three-dimensional dynamic covalent network structure is loaded with manganese ions coordinated with phosphate groups in a post-introduction mode, through a phytic acid-cystamine-manganese ion ternary synergistic flame-retardant system, the flame-retardant property is remarkably improved, and meanwhile, based on a triple degradable response mechanism of imine bonds, ester bonds and disulfide bonds, the flame-retardant property is remarkably improved. And the material is endowed with excellent degradability.

The invention discloses a pressure-sensitive adhesive for thermosetting coating rolling and light curing bonding and a preparation method of the pressure-sensitive adhesive. The pressure-sensitive adhesive is prepared from the following raw materials: a polyurethane acrylate prepolymer, a dynamic disulfide bond cross-linking agent, an NCO-containing closed curing agent, a trifunctional acrylate monomer, a bifunctional diluting monomer and an acylphosphine oxide photoinitiator. Wherein the polyurethane acrylate prepolymer, the dynamic disulfide bond cross-linking agent and the closed curing agent form a thermocuring component; the three-functionality acrylate monomer, the double-functionality diluting monomer and the acylphosphine oxide photoinitiator form a photocuring component. The adhesive provided by the invention is widely applied to coiled material processing and terminal products, and effectively solves the dual requirements of insufficient initial adhesion and high peel strength.

The present application belongs to the field of organic photo-functional materials and biomedical materials, and particularly relates to a phenanthraquinone-based covalent organic framework material, a nano-preparation containing the same, a preparation method thereof and biomedical applications. In the present application, a Schiff base condensation reaction is carried out between a bis(formylphenyl) monomer with a phenanthraquinone group or an aza-phenanthraquinone group and N,N,N',N'-tetra(p-aminophenyl)-p-phenylenediamine, and through reversible covalent connection of aldehyde groups and amino groups, the phenanthraquinone-based covalent organic framework material is prepared, and it is found that the phenanthraquinone-based covalent organic framework material can efficiently generate superoxide anion radicals under 808 nm near-infrared light irradiation, thereby destroying the intracellular redox homeostasis, selectively accelerating NADPH consumption, promoting excessive formation of disulfide bonds, and leading to induction of tumor cells to undergo disulfide death. The phenanthraquinone-based covalent organic framework material of the present application provides a new strategy for solving the problem of drug resistance in tumor treatment, and has a broad application prospect.

The invention discloses a preparation method of high-dispersity pigment carbon black, which comprises the following steps: S1, carrying out heat treatment on original carbon black under the protection of inert gas to obtain surface-activated carbon black; s2, carrying out heating reaction on the carbon black and grafting molecules to obtain functional carbon black of which the surface is grafted with specific active groups after the reaction; s3, dispersing the carbon black in an organic solvent, firstly adding an olefin pyridine monomer to carry out substitution reaction, then adding a functional monomer containing a dynamic covalent bond to carry out polymerization reaction, and forming a polymer brush on the surface of the carbon black; and S4, carrying out post-treatment to obtain the high-dispersity pigment carbon black. According to the preparation method, high steric hindrance and solvation rejection are given to the carbon black through a covalent anchoring-polymer brush structure, the sedimentation rate of an alcohol ester system is smaller than 5%, and long-term thermal aging stability is maintained by virtue of a stress relaxation mechanism of a dynamic disulfide bond; the harsh requirements of high-end printing ink, high-solid-content coatings and polymer master batches on high blackness, low sedimentation and durability can be met.

The invention relates to the technical field of polymer composite materials, in particular to a high-leveling-property rapid self-repairing coating which comprises a component A and a component B according to the mass ratio of (4-5): 1. The component A is prepared from the following components in parts by mass: 50 to 70 parts of hydroxyl-containing acrylic resin, 10 to 30 parts of hydroxyl-terminated polyurethane prepolymer with dynamic disulfide bonds, 0.1 to 1.0 part of flatting agent and 15 to 25 parts of solvent; the component B is an aliphatic polyisocyanate curing agent; the preparation method comprises the following steps: mixing the hydroxyl-containing acrylic resin, the hydroxyl-terminated polyurethane prepolymer with the dynamic disulfide bonds, the flatting agent and the solvent at room temperature under the protection of a dark inert gas, and stirring until the mixture is uniform and transparent; mixing the component A and the component B in proportion, and curing for 10-20 minutes. The dynamic disulfide bonds can generate reversible bond breaking and recombination under thermal stimulation, and when the paint film generates scratches, the disulfide bonds at the scratches are rearranged and connected through medium-temperature heating, so that the macroscopic scratches are driven to be closed, and self-repairing is realized.

The invention provides a polymer compatilizer and application thereof, and relates to the technical field of organic materials. Specifically, a molecular chain of the polymer compatilizer comprises a polyolefin chain segment, a reversible covalent bond group and an active functional group which are connected in sequence; wherein the reversible covalent bond group comprises at least one of a cycloaddition reaction system, a disulfide bond system, a borate bond system, an acylhydrazone bond system, an oxime bond system, a trithiocarbonate bond system and a tetrazole-olefin light click chemical system. According to the compatilizer structure, a dynamic covalent cross-linked network can be constructed at the interface of the composite material, and the interface is endowed with an intelligent response characteristic through fracture and recombination of reversible covalent bonds, so that the interface bonding strength of the composite material is far higher than that of a traditional system; the technical problems that in the material service process in a traditional system, due to permanent covalent bonding, an interface is prone to being damaged and cannot be reversibly repaired are effectively solved.

The application discloses a kind of by mesoporous Fe 0 Nanometer material enhances the method for activity of gallic acid and application thereof.The present application fixes gallic acid (GA) with redox activity in mesoporous zero-valent iron nanoparticles (Fe 0 NPs), and then encapsulated by SiO2 outer layer containing disulfide bond (denoted as Fe 0 @GA-ss-SiO2NPs). With the help of intracellular glutathione, oxygen molecules are activated by electron transfer, and a large amount of O2 ·‑ And H2O2 are spontaneously generated, and the sustained high concentration of Fe 0 Fe 2+ Further catalyzes the decomposition of H2O2, and generates highly oxidized ·OH free radicals. At the same time, GA quinone derivatives produce 1 O2 by Russel mechanism. In vitro cell experiments confirm that the nanometer material can cause cancer cell ferroptosis, and exhibits high-efficiency cancer cell killing effect at ultra-low dose.

Disclosed are an electronic device using a self-healing biodegradable elastic conductor and a method for manufacturing the same. he method for manufacturing the electronic device using the self-healing biodegradable elastic conductor includes: preparing a base film; forming an electrode pattern by spin-coating a conductive polymer solution on the base film; and annealing the electrode pattern, wherein the base film is manufactured from a polymer formed by bonding diisocyanate to both ends of a biodegradable polymer and bonding a chain extender having a disulfide bond structure to an end of the diisocyanate, and the conductive polymer solution is a mixed solution of a conductive polymer, an ionic liquid, polyethylene glycol, and glycerol.

The present invention relates to the use in a secondary Li-ion battery of an amorphous polymer P1 comprising at least one segment –(SRS)-(SRS)-.

The invention discloses a dynamic covalent bond in-situ self-repairing composite nanofiltration membrane based on temperature response and a preparation method and application thereof, and belongs to the technical field of nanofiltration membranes. A functional layer of the nanofiltration membrane is a cross-linked network containing dynamic covalent bonds and formed by common reaction of aromatic diamine, a cross-linking agent and trimesoyl chloride, and the dynamic covalent bonds are imine bonds or disulfide bonds. When the surface of the membrane is damaged, dynamic covalent bond breakage and recombination can be triggered through mild heating at 60-80 DEG C, in-situ self-repairing of the membrane is achieved, and the repairing efficiency is larger than or equal to 90%. Compared with an existing beta-cyclodextrin system, pH adjustment is not needed, the elastic modulus is increased by 40% or above, the new membrane dye retention rate is larger than or equal to 98%, the method is suitable for printing and dyeing wastewater treatment and fine chemical engineering separation scenes, and the service life of the membrane can be remarkably prolonged.

The invention belongs to the technical field of building materials, and particularly relates to an anti-seepage self-repairing material and a preparation method and application thereof. According to the material, graded porous SiOmicrospheres with functionalized surface epoxy groups are taken as a carrier, are loaded in order through space, and are coated with a hydrophobic dynamic repairing agent and a mineral reinforced precursor at the same time. A main chain of the hydrophobic dynamic repairing agent contains a dynamic disulfide bond, so that the hydrophobic dynamic repairing agent has rapid hydrophobic plugging and room-temperature self-healing capabilities; the mineral reinforced precursor can generate secondary C-S-H gel in the cracks, and long-term reinforcement is achieved. The two realize efficient cascade repair under the adjacent action of the carrier space, and the epoxy group on the carrier surface and the cement matrix form strong chemical bonding. After the material is doped into concrete, the self-repairing efficiency and the long-term durability of cracks can be remarkably improved, the material is particularly suitable for concrete structures in water conservancy, ocean and other harsh and humid environments, and the problems that an existing repairing technology product is poor in durability and an interface is prone to falling off are solved.

This invention belongs to the field of thermosetting plastic recycling technology, specifically relating to a high-strength adhesive made from waste polyurethane foam, its preparation method, and its application. The preparation method of the high-strength adhesive of this invention includes the following steps: (1) dissolving an aldehyde-containing bio-based monomer and a diamine containing disulfide bonds in a solvent, and refluxing at 60-90℃ for 3-8 h to obtain a dynamic crosslinking agent; (2) placing waste polyurethane foam powder into a ball mill jar, adding an organic base catalyst and the dynamic crosslinking agent obtained in step (1), ball milling for 1-2 h at a speed of 500-650 rpm, and obtaining the high-strength adhesive after ball milling. This invention introduces a dynamic crosslinking agent into waste polyurethane foam, promoting the construction of a multiple dynamic covalent network between the urethane bonds and the reversible covalent bonds in the dynamic crosslinking agent under the catalytic action of the organic base, synergistically improving the reprocessing mechanical properties of the waste polyurethane foam.

The application discloses a volume fracturing intelligent construction fracture network thickening agent and a preparation method thereof, relates to the technical field of high-temperature oil and gas well fracturing fluid thickening agents, and the preparation method comprises the following steps: 1) synthesis of a biomimetic polymer skeleton; 2) grafting of a molecular shock absorber structure; and 3) modification of an intelligent switch group. The product is an intelligent biomimetic fracture network thickening agent, and through the synergistic effect of a biomimetic polymer skeleton, a dynamic disulfide bond molecular shock absorber and a crown ether intelligent switch group, specific response to potassium ions is realized. In K + The product can be quickly converted from a fluid state into an elastic gel state under triggering, and the sand carrying performance is significantly improved; the product has excellent high-temperature resistance and self-repairing capacity, and can be used for 10,000 s ‑1 The viscosity recovery rate after high-speed shearing is more than 78%, and the viscosity retention rate is kept high in long-term shearing. Meanwhile, the product has excellent gel breaking performance, and provides an intelligent controllable, efficient and stable fracture network construction solution for volume fracturing.

The invention discloses a PET (Polyethylene Terephthalate) protective film as well as a preparation method and application thereof, and relates to the technical field of electronic product protective films. The invention discloses a preparation method of a PET (Polyethylene Terephthalate) protective film, which comprises the following steps: coating a pressure-sensitive adhesive on the surface of a plastic film layer, and curing to form an adhesive layer to obtain the PET protective film, according to the invention, a soft monomer, a hard monomer and a crosslinking monomer are subjected to chemical bonding copolymerization, and carboxylated GQDs, an antistatic monomer and a dynamic disulfide bond crosslinking agent are added to prepare the pressure-sensitive adhesive. According to the invention, the polyethylene glycol monoacrylate and the 1-ethyl-3-methylimidazole bis (trifluoromethanesulfonyl) imide salt are added to synergistically realize an antistatic function. According to the invention, carboxylated GQDs are introduced into a core layer to construct a nano-scale exhaust channel, and a dynamic disulfide bond cross-linked network is combined, so that the anti-bubble capability is enhanced in multiple dimensions. The PET protective film prepared by the invention can stably pass high-temperature, high-humidity and high-temperature aging tests.