16results about How to "Improve self-healing efficiency" patented technology

The invention relates to multi-dynamic-bond synergistic self-repairing polyurethane and a preparation method thereof, and belongs to the technical field of polyurethane. The polyurethane is prepared from the following raw materials: poly (dihydric alcohol), diisocyanate, a pyridine chain extender, catechol and ferric ion salt. A main chain of polyurethane is formed by chain extension of polydihydric alcohol and diisocyanate through a pyridine chain extender, an end group is a catechol group exposed after end sealing of a catechol substance, on one hand, ferric ions and the catechol group form a metal coordination bond, and on the other hand, ferric ions and nitrogen atoms on pyridine form a coordination bond; the polyurethane contains multiple dynamic bonds, including coordination bonds of pyridine and iron ions, coordination bonds of catechol and iron ions, and hydrogen bonds between macromolecular chains. When the material is subjected to external pressure, the material has relatively good damping capacity due to internal friction force in a molecular chain; meanwhile, the polyurethane has good self-repairing capability at room temperature.

The invention discloses a super-hydrophobic self-repairing polyurethane film for photovoltaics and a preparation method of the super-hydrophobic self-repairing polyurethane film. The super-hydrophobic self-repairing polyurethane film is prepared from the following components in parts by weight: polyether polyol, isocyanate, a catalyst, a solvent, a self-repairing auxiliary agent, a chain extender and super-hydrophobic nanoparticles, the super-hydrophobic nano particles are fluorine-silicon polymer nano particles which are modified hydrophobic nano particles obtained by hydrolyzing two or more organic silicon and then introducing a C-F bond through copolycondensation to realize fluorination modification; the service life of the composite material is prolonged, the durability of the composite material is improved, and the material can be self-healed after being damaged by the outside; on the basis of self-repairing, hydrophobic nanoparticles are added to realize a super-hydrophobic surface; the transparent polyurethane film material for the photovoltaic power generation panel can be adhered through electrostatic adsorption or other adhesives, so that the film material is loaded on the photovoltaic panel, the photovoltaic panel is protected, and the photovoltaic panel is prevented from being damaged due to external environment pollution.

The invention relates to the field of high polymer materials, and discloses a visible light repairing type waterborne polyurethane emulsion and a preparation method thereof.The preparation method comprises the following steps that polytetrahydrofuran, isophorone diisocyanate, 2, 2-dimethylolpropionic acid and butyltin dilaurate are taken and placed in a reactor, pre-polymerization chain extension is conducted at the temperature of 60-90 DEG C, and a polyurethane prepolymer is obtained; the preparation method comprises the following steps: firstly, adding ASB-PEG2000-ASB, carrying out chain extension at 40-60 DEG C, then adding butanediol and carbohydrazide, continuously carrying out chain extension, then adding glucose, carrying out crosslinking at 40-60 DEG C, finally cooling to 25-50 DEG C, adding triethylamine, carrying out stirring to form a salt, adding deionized water, carrying out stirring dispersion, and carrying out emulsification so as to prepare the visible light repairing type waterborne polyurethane emulsion. The water-based polyurethane emulsion has the advantages that the water-based polyurethane emulsion has wide absorption in the visible light wave band, the self-repairing efficiency is high, the water-based polyurethane emulsion and polytetrahydrofuran are simultaneously used as soft segments to be introduced into water-based polyurethane, and the prepared water-based polyurethane emulsion has high mechanical performance and a visible light induced self-repairing function.

The invention relates to the technical field of self-repairing high polymer materials, and discloses self-healing tannic acid-based polyurethane as well as a preparation method and application thereof, tannic acid is taken as a cross-linking agent, castor oil is taken as polyol of polyurethane, isophorone diisocyanate is taken as polyisocyanate of polyurethane, bis (2-ethoxyl) disulfide and 1, 3-butanediol are taken as a crosslinking agent, and the self-healing tannic acid-based polyurethane is prepared by a one-step method. The preparation method comprises the following steps: by taking 1, 4-butanediol as a chain extender of polyurethane, preparing tannic acid-based polyurethane on the basis of a prepolymer method; the self-healing temperature of the tannic acid-based polyurethane film prepared from the tannic acid-based polyurethane is 80 DEG C, and the self-repairing efficiency is as high as 95%.

The invention relates to the field of epoxy vitreous body materials, and discloses a preparation method of a self-repairing epoxy vitreous body material and a prepared material.The preparation method comprises the steps that an epoxy resin copolymer, a modified curing agent and an organic acid catalyst are subjected to a first reaction, the molar ratio of the epoxy resin copolymer to the modified curing agent is 2: (0.5-5), and a second reaction is conducted; the molar ratio of the organic acid catalyst to the epoxy resin copolymer is (1-10): 20. The self-repairing epoxy vitreous body material provided by the invention is high in self-repairing efficiency and short in self-repairing time; the self-repairing epoxy vitreous body material is wide in preparation raw material source and flexible and changeable in formula, the proportion of the raw materials can be adjusted according to actual needs so as to regulate and control the mechanical property of the material, recycling and reutilization can be achieved under certain conditions, environmental pollution is reduced, and the self-repairing epoxy vitreous body material is suitable for industrial production. And the composite material has great application potential in products such as structural components required by space shuttles and automobile industries.

The present application discloses a self-repairing super-hydrophobic nano anti-corrosion coating and a preparation method thereof, and relates to the technical field of anti-corrosion coatings, including a self-repairing super-hydrophobic nano anti-corrosion coating, which is composed of an organic fluorine-silicon modified acrylic resin, hydrophobic nano-SiO2, microcapsules containing particles of different particle sizes, xylene and a platinum-based catalyst, wherein the capsule core of the microcapsule is dimethyl silicone oil, a corrosion inhibitor mixture and nanoparticles, and the capsule wall is polyurea formaldehyde and micron particles; the corrosion inhibitor is benzotriazole; the nanoparticles and micron particles both include silicon dioxide and titanium dioxide; the particle size of the nanoparticles is nanometer-level, and the particle size of the micron particles is micron-level; the coating can be enhanced in hydrophobicity, the coating is not easily damaged for the second time, the service life of the coating is extended, and the repair efficiency and repair performance are improved.

The invention discloses an organic silicon elastomer capable of being self-repaired at room temperature, a preparation method and a metal coordination organic silicon elastomer. The preparation method comprises the following steps: S1, dissolving silicone rubber and a diarylethene derivative in a first solvent, and reacting to obtain a first product; and S2, adding bifunctional isocyanate into the first product, and reacting to obtain the organic silicon elastomer capable of being self-repaired at room temperature. The organic silicon elastomer prepared by the invention has excellent light response performance and light healing performance, can realize self-healing at normal temperature, and can be repeatedly processed. On one hand, in the self-healing process, only one light source is used, and practical application is facilitated. On the other hand, self-healing can be achieved in a short time, and the self-healing efficiency is remarkably improved. In addition, the metal coordination organic silicon elastomer prepared by the invention also has excellent mechanical properties.

The invention discloses a preparation method of a high-adhesion self-repairing polyurethane elastomer, which specifically comprises the following steps: taking polytetrahydrofuran glycol and isophorone diisocyanate as raw materials, taking tannic acid and 4, 4 '-diaminodiphenyl disulfide as chain extenders, and adopting a one-pot polymerization method to prepare high-adhesion polyurethane. The polyurethane elastomer is endowed with self-repairing performance by introducing an aromatic group disulfide bond and a dynamic hydrogen bond, the prepared material can complete the repairing process within 2 hours at the temperature of 80 DEG C, and the adhesive force on steel is greater than 10 MPa. A new insight is given to preparation of a high-adhesion self-repairing material, the synthesis method is simple, and the prepared polyurethane has excellent adhesion and self-repairing performance and can be applied to multiple fields.

The application discloses active powder concrete and a preparation method and application thereof, relates to the technical field of concrete materials and marine engineering durability, and realizes the synergistic promotion of crack self-repairing efficiency, chloride ion solidification capacity and fiber-matrix interface bonding performance. The application solves the problems of long-term self-repairing failure caused by premature consumption of repair components in traditional self-repairing technology, the chloride ion solidification efficiency far lower than the theoretical value caused by uneven dispersion and weak interface bonding in traditional ion capturing means, and the problems of accelerated matrix damage caused by poor interface bonding and missing passivation protection of traditional steel fibers.

The application provides a self-repairing silicone resin and a preparation method thereof, OCA optical glue containing the self-repairing silicone resin and application of the self-repairing silicone resin. The self-repairing silicone resin contains a disulfide bond and a mercapto group in a molecular structure. The content of the disulfide bond in the self-repairing silicone resin is greater than 0.6 mmol / g. The self-repairing silicone resin is used for preparing OCA optical glue. While ensuring high light transmittance, low yellowing and good mechanical properties of the OCA optical glue, the self-repairing silicone resin can improve the initial adhesion of the OCA optical glue, and can also endow the OCA optical glue with a self-repairing function and improve the repair efficiency.

The invention aims to provide a self-repairable cement-based material and application thereof, and belongs to the technical field of mining fire prevention and extinguishing materials, the self-repairable cement-based material comprises a gel material, a complexing agent, an active chemical material and a catalytic solvent, the mass of the complexing agent is 40% of the mass of the gel material, and the mass of the active chemical material is 40% of the mass of the gel material. The mass of the active chemical material is 60% of that of the gel material, and the mass of the catalytic solvent is 40-50% of the total mass of the gel material, the complexing agent and the active chemical material. The preparation method of the self-repairable cement-based material is simple and easy to operate, the prepared self-repairable cement-based material has the advantages of being low in cost, good in fluidity, high in self-repairing efficiency and good in repairing effect, and the fire preventing and extinguishing effect can be achieved in the mode of blocking air and isolating oxygen at the three stages before solidification, after solidification and after cracking repairing.

The present invention discloses a hydrophobic double-shell isocyanate type self-repairing microcapsule and its preparation method and application, belonging to the technical field of polymer chemistry. First, TMP and IPDI monomers are used to prepare a multifunctional isocyanate prepolymer core material TMP-IPDI, and then polyurethane is used as a wall material, and the obtained core material and fluorescent agent 4,4-bis (2-sodium disulfonate styrene) biphenyl are used to prepare fluorescent isocyanate type self-repairing microcapsule powder; finally, the obtained fluorescent isocyanate type self-repairing microcapsule is secondary coated with silicon dioxide modified with tridecafluorooctyl trimethoxysilane to obtain a hydrophobic double-shell isocyanate type self-repairing microcapsule. The operation of the present invention is simple, and the prepared microcapsule has high self-repairing efficiency and good compactness. It can be used as a coating filler to repair coating microcracks, and has the functions of hydrophobicity and corrosion resistance.

This invention discloses a two-component self-healing polyurethane crack sealant based on dynamic disulfide bonds and its preparation method. The sealant comprises, by weight, component A containing 40-50 parts of polyol and 10-20 parts of diisocyanate, and component B containing 3-9 parts of a chain extender containing dynamic disulfide bonds, 0.5-3.5 parts of an auxiliary chain extender, 20-25 parts of filler, and 0.05-0.2 parts of catalyst; wherein the molecular weight of the polyol is 650-2000; the mass ratio of component A to component B is (1.5-2.5):1; and the catalyst is an organotin carboxylate catalyst. The sealant provided by this invention provides damage / repair functionality through the dynamic disulfide bond chain extender, while the auxiliary chain extender constructs stable hard segment crystals or hydrogen bond networks, providing initial strength and dimensional stability. These two components synergistically improve the self-healing properties and toughness of the prepared polyurethane crack sealant.

This disclosure provides a silicon-carbon anode sheet, its preparation method, and a soft-pack lithium battery. The preparation method of the silicon-carbon anode sheet involves: dissolving water-soluble conductive polyaniline in an organic solvent, mixing it with CMC adhesive, and then mixing it with silicon-carbon slurry and a multifunctional organophosphonic acid crosslinking agent (mixing temperature: 15℃-25℃) to obtain an anode slurry; coating the anode slurry onto a negative current collector to obtain a silicon-carbon anode sheet semi-finished product; and sequentially subjecting the silicon-carbon anode sheet semi-finished product to pre-baking (90℃-120℃) and vacuum drying (70℃-90℃, time: 2h-5h) to obtain the silicon-carbon anode sheet. This method, by adding multifunctional organophosphonic acid crosslinking agents and water-soluble conductive polyaniline, facilitates the formation of a three-dimensional conductive suppression network with high conductivity, uniform and continuous conductivity, strong toughness and strong self-healing ability. This enhances the constraint on the negative electrode slurry, reduces the volume expansion rate to <15%, inhibits silicon-carbon cracking, and improves the self-healing ability of the three-dimensional conductive suppression network, thus broadening the application of high-capacity silicon-carbon negative electrode sheets in soft-pack lithium batteries.

This invention relates to the field of coating technology and discloses a polyurea waterproof coating and its preparation method, comprising the following weight components: 40-50 parts by weight of polyurea resin, 3-5 parts by weight of fluorine-modified bamboo powder, 0.2-0.4 parts by weight of BYK-071 defoamer, and 0.1-0.3 parts by weight of BYK-345 leveling agent; the preparation method of the fluorine-modified bamboo powder is as follows: Step 1: reacting bamboo powder with KH-550 to obtain coupling agent-modified bamboo powder; Step 2: reacting the coupling agent-modified bamboo powder with perfluorooctanoyl chloride under the action of triethylamine catalyst to obtain fluorine-modified bamboo powder. The polyurea waterproof coating prepared by this invention has good waterproof and self-healing effects.

The present invention discloses a flexible composite conductive hydrogel and a preparation method and application thereof. The preparation method of the flexible composite conductive hydrogel comprises the following steps: (1) adding sodium periodate to a nanocellulose dispersion, performing a light-shielding oxidation reaction to obtain a dialdehyde nanocellulose dispersion; (2) preparing a silver ammonia solution using an ammonia solution and a silver nitrate solution; then reacting the silver ammonia solution with the dialdehyde nanocellulose dispersion to obtain silver-loaded nanocellulose; (3) adding adhesive urea and a silver nanowire dispersion to the silver-loaded nanocellulose, stirring and reacting at room temperature for 10 to 12 hours, then heating to 75 to 100° C., adding polyvinyl alcohol and borax, and reacting to obtain a flexible composite conductive hydrogel. The hydrogel prepared by the present invention has multifunctional properties such as super stretchability, strong adhesion, self-healing, conductivity, and antibacterial properties, and has good application prospects in the fields of biosensors, biomedicine, and the like.