1239 results about "Acrylate" patented technology

The invention discloses an absorbable suture line for surgical suture and a preparation method thereof, and relates to the technical field of medical materials. The absorbable suture line for surgical suture is prepared from the following raw materials in parts by weight: 50 to 65 parts of polylactic acid, 15 to 20 parts of polyglycolic acid, 3 to 5 parts of sodium carboxymethyl cellulose, 3 to 8 parts of a toughening agent, 3 to 6 parts of an antibacterial agent, 0.3 to 0.8 part of a lubricating agent, 1 to 2 parts of sodium hyaluronate and 5 to 10 parts of polyvinyl alcohol. The toughening agent is obtained by reacting hydroxyethyl acrylate with ethylenediamine to generate a four-arm compound and then reacting with 6-caprolactone and DL-lactide. The absorbable suture line for surgical suture prepared by the invention has excellent tensile property and antibacterial property, and can meet the application requirements of clinical medical treatment.

The invention discloses an acrylate grouting material and a preparation method thereof.The acrylate grouting material comprises a component A and a component B. The component A comprises, by weight, 40-90 parts of an acrylate main agent; 1-15 parts of a cross-linking agent; 0.1 to 10 parts of an accelerant; 1-30 parts of an inorganic filler; the component B comprises the following components in parts by weight: 0.1-10 parts of an initiator; wherein the inorganic filler is selected from one or two of an inorganic cementing material and inorganic nanoparticles. An organic-inorganic interpenetrating network structure is constructed on the basis of an electrostatic complexing action principle between an organic monomer and an inorganic monomer by using an inorganic cementing material and inorganic nanoparticle hybridized acrylate, so that the strength of a slurry consolidated body is greatly improved and the service life of the slurry consolidated body is greatly prolonged on the premise of ensuring the permeability of the slurry.

The invention provides a low-temperature electrolyte, positive electrode slurry and a low-temperature sodium ion battery, and belongs to the technical field of battery materials. The low-temperature electrolyte provided by the invention comprises sodium hexafluorophosphate, propylene carbonate, ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, fluoroethylene carbonate, 2, 2, 3, 4, 4, 4-hexafluorobutyl acrylate and 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether. The battery provided by the invention comprises the low-temperature electrolyte. The low-temperature electrolyte and the low-temperature sodium-ion battery provided by the invention not only can be compatible with a blended positive electrode material, but also can give consideration to low-temperature performance, ensure that the prepared low-temperature sodium-ion battery has good reaction kinetics and cycle performance, and also can improve the energy density of an electrode and reduce the resistivity of powder.

The invention relates to an optical monomer and a preparation method and application thereof, the structural general formula of the optical monomer is as follows: R1, R2 and R3 are respectively selected from one of hydrogen and C1-C4 alkyl, A1 is selected from one of hydrogen and C1-C4 alkyl, and A2 is C1-C4 alkyl; r4 is selected from one of H, phenyl and C1-C4 alkyl, and A2 is C1-C4 alkyl; and R5 is hydrogen or methyl. The optical monomer provided by the invention contains a (methyl) acrylate group, and has the properties of high refractive index and low volume shrinkage; and a plurality of aromatic rings with high molar refractive index and low molar volume are contained, so that the whole molecule of the whole monomer is extremely high in refractive index. The monomer structure provided by the invention has a plurality of branched chains, the overall molecular weight is small, and the molecules are not easy to agglomerate.

The invention relates to the technical field of temporary plugging agents, and discloses a water-soluble temporary plugging agent for oil well fracturing and a preparation method thereof. According to the prepared water-soluble temporary plugging agent, sodium lignin sulfonate / graphene oxide serves as a core, then the surface of the core layer is coated with a polyacrylic acid-polyacrylamide copolymer to form a first shell layer, and then the surface of the first shell layer is coated with acrylate modified chitosan to form a second shell layer; the temporary plugging agent is applied to oil well fracturing, not only has excellent plugging performance, dissolving performance and anti-shearing performance, but also can improve the transportation capacity of the temporary plugging agent in the oil well fracturing process.

The invention provides a preparation method of high-performance polyacrylonitrile pre-oxidized fibers, and belongs to the technical field of preparation of carbon filaments from polyacrylonitrile. The preparation method comprises the following steps: adding hydroxylated carbon nanotubes into deionized water, performing ultrasonic dispersion, adding a modifier and a catalyst, continuing ultrasonic dispersion, heating to 80-90 DEG C, performing constant-temperature reaction, fully washing with water, and drying to obtain modified carbon nanotubes; dispersing the modified carbon nanotube in an N, N '-dimethylformamide solution, adding an acrylonitrile monomer, hydroxyethyl acrylate and an initiator, copolymerizing to form a carbon nanotube / acrylonitrile copolymer, and spinning to obtain a carbon nanotube / acrylonitrile copolymer fiber; the carbon nano tube / acrylonitrile copolymer fiber is placed in a microwave treatment device, and a plurality of microwave generators are arranged in the microwave treatment device and are used for carrying out segmented pre-oxidation on the carbon nano tube / acrylonitrile copolymer fiber. The problems that an existing polyacrylonitrile fiber pre-oxidation technology is high in energy consumption and low in strength, poor in flame retardance and the like due to the difference between internal and external pre-oxidation effects can be solved.

The embodiment of the invention provides an electrolyte, a battery and electric equipment, the electrolyte comprises a lithium salt, an organic solvent and a polymer matrix, and monomers of the polymer matrix comprise vinylene carbonate and isocyanate ethyl acrylate. In the electrolyte provided by the embodiment of the invention, the monomers of the polymer matrix comprise vinylene carbonate and isocyanate ethyl acrylate, and the low HOMO energy level of isocyanate ethyl acrylate can weaken the electron loss ability of the polymer matrix and improve the oxidation stability of the electrolyte, so that the relatively poor electrochemical stability is improved; and a copolymerization structure of vinylene carbonate and isocyanate ethyl acrylate reduces the crystallinity of a polymer matrix and provides a smoother path for Li < + > transmission, so that the ionic conductivity of the electrolyte is improved. Therefore, the electrolyte provided by the invention can effectively improve the problems of low room-temperature ionic conductivity and relatively poor electrochemical stability of the existing gel electrolyte, and has a good application prospect.

The present invention provides an organic phosphonic acid betaine and a preparation method thereof, specifically an ammonium phosphonic acid betaine containing a glycidyl group. The organic phosphonic acid betaine can be used as a functional monomer for free radical grafting modification of the surface of a polymer material such as polyolefin, or can be mixed with acrylate, acrylonitrile or other olefin monomers for copolymerization to prepare an amphoteric ionomer. The organic phosphonic acid betaine can also be used for ring-opening grafting modification of polymer materials such as starch, cellulose, polyurethane, and polyamide containing amino or hydroxyl groups in their structures. At the same time, the phosphonic acid betaine imparts functional effects such as zwitterionization, hydrophilicity, antibacterial properties, and antifouling properties to the obtained polymer material. The organic phosphonic acid betaine also has high chemical stability in acidic and alkaline water environments.

The invention relates to the field of secondary batteries, and particularly discloses a wetting agent, positive electrode slurry, a preparation method and application. The wetting agent comprises an acrylate monomer, a cyano-containing monomer, a vinyl functional monomer, a surfactant and an initiator. The glass transition temperature of the wetting agent ranges from-50 DEG C to 30 DEG C, and after the wetting agent is soaked in electrolyte for 72 h, the mass swelling rate ranges from 500% to 3000%, and the volume swelling rate ranges from 50% to 1000%. A certain amount of the wetting agent is added into positive electrode slurry and is mixed and matched with a binder for use, so that the wettability of an electrolyte of a pole piece can be improved, a battery cell can quickly absorb the electrolyte, the electrolyte retention capacity of the battery is better, and the rate capability and the cycle performance of the battery are improved. And meanwhile, the wetting agent is of a linear structure and plays a long-range connection role in the pole piece, so that the adhesive force of the pole piece is improved, and the possibility that the pole piece falls off in the circulation process is reduced, thereby further improving the cycle performance of the battery.

The invention discloses silicone rubber and a preparation method thereof, and belongs to the technical field of silicone rubber, and the silicone rubber is prepared from the following raw materials: raw vinyl silicone rubber, zinc acrylate, a platinum catalyst, a hydrogen-containing silicone oil cross-linking agent and silicon carbide nanowires. According to the invention, a covalent network based on raw vinyl silicone rubber is constructed in the silicone rubber, and zinc acrylate and silicon carbide nanowires form an ionic network, so that the double-network structure not only can improve the technical problem of high probability of rubber overflow in the preparation process of the silicone rubber, but also can enable the silicone rubber to obtain better mechanical properties.

The invention relates to the technical field of bioanalytical chemistry, in particular to a method for simultaneously enriching and separating glycopeptides and phosphopeptides by using a bionic hydrophilic adsorbent, which specifically comprises the following steps: step 1, preparing a polyether-ether-ketone (PEEK) framework by using a fused deposition modeling method (FDM); 2, soaking the obtained PEEK framework in an aqueous solution containing dopamine hydrochloride and tris (hydroxymethyl) aminomethane, and carrying out a reaction; step 3, then, adding a mixed solution containing hyaluronic acid methacrylate, vinyl phosphoric acid, N, N-dimethyl bisacrylamide and phenyl-2, 4, 6-trimethylbenzoyl lithium phosphate into the PEEK framework; in the invention, in the aspect of material preparation, a fused deposition modeling method (FDM) is adopted to prepare a polyether-ether-ketone (PEEK) frame, and the material has good mechanical properties and chemical stability and can bear a series of subsequent complex treatment processes without being damaged.

The invention relates to the field of building materials, and discloses high-toughness and high-energy-absorption polymer emulsion modified mortar and a preparation method thereof, and the mortar is composed of ordinary Portland cement, river sand, a polymer emulsion, water, an active admixture and chopped fibers. Wherein the polymer emulsion is selected from styrene-acrylic emulsion (SBR), ethylene-vinyl acetate (EVA), polyurethane emulsion or a combination thereof; the mixing amount is 5-20wt% of the mass of the cementing material. According to the invention, a viscoelastic network is formed in a cement matrix through the polymer emulsion, and the synergistic effect of the active admixture and the chopped fibers is combined, so that the bonding strength, the crack resistance, the impact resistance and the stress wave dissipation capability of the mortar are remarkably improved. Test results show that the mortar provided by the invention is obviously superior to ordinary mortar in the aspects of 28d breaking strength, impact toughness and stress wave attenuation performance, and is suitable for high-performance constructional engineering and protective engineering.

The embodiment of the invention relates to a slow-release polymer coating as well as a preparation method and application thereof, and the preparation method comprises the following steps: mixing a polymer monomer, a polymer monomer initiator, a solvent, a cross-linking agent and an electrolyte initiator in proportion to obtain coating precursor slurry; wherein the polymer monomer comprises a fluorinated acrylate compound; the polymer monomer initiator includes: a radical initiator; the solvent comprises an ether compound; the cross-linking agent comprises one or more of a polyethylene glycol derivative and an acrylate compound; the electrolyte initiator comprises lithium salt which can generate protonic acid with trace water and is resistant to high temperature; and coating the surface of an object to be covered with the coating precursor slurry, and carrying out heating polymerization treatment to obtain the slow-release polymer coating. The slow-release polymer coating can protect the lithium metal negative electrode and enhance the high-temperature safety performance of the lithium metal battery.

The invention relates to the technical field of cables, and provides a high-toughness corrosion-resistant medium-voltage power cable, which comprises a conductor, and an insulating layer, a shielding layer, an armor layer and a sheath layer which are sequentially arranged outside the conductor, the sheath layer comprises the following components in parts by weight: 70-100 parts of polyvinyl chloride, 30-40 parts of nitrile rubber, 10-15 parts of a flame retardant, 15-20 parts of a plasticizer, 1-3 parts of an antioxidant, 5-10 parts of a filler, 2-4 parts of a heat stabilizer, 1-3 parts of a compatilizer and 0.5-2 parts of a cross-linking agent; the filler is prepared from the following raw materials in parts by weight: 100 parts of calcium carbonate, 20 to 24 parts of 2-ethylhexyl acrylate and 6 to 10 parts of acrylic acid. According to the technical scheme, the problem of poor corrosion resistance of the medium-voltage power cable in the prior art is solved.

The invention discloses a functional intermediate for polycarboxylic acid synthesis modification and a preparation process thereof, the intermediate is a copolymer containing a phosphate group, an acrylate group and a hyperbranched polyether polyol chain segment, the molar ratio of all structural units is 1: (1-3): (0.5-2), and the preparation method comprises the following steps: esterification reaction; carrying out phosphorylation reaction; and carrying out gradient vacuum to remove small molecules. The intermediate is high in content of effective components, the viscosity is 500-2000mPa. S, the dispersing performance and the slump loss resistance of the polycarboxylate superplasticizer are remarkably improved through the synergistic effect of phosphate tackifying, acrylate dispersing and hyperbranched compatibilizing, the intermediate is particularly suitable for concrete construction under complex gravel geological conditions, the doping amount is reduced compared with that of traditional hydroxyethyl acrylate, and the service life of the polycarboxylate superplasticizer is prolonged. And the slump of the mother liquor can be kept lossless for a long time.

The invention discloses a super-tough temperature-resistant self-repairing copolymer based on SBS acrylate dynamic synergistic reinforcement and a preparation method thereof, and belongs to the technical field of self-repairing materials in compositions of high-molecular compounds. The copolymer comprises SBS, an acrylate monomer, a dynamic bond functional monomer, an initiator, a cross-linking agent, a nano reinforcing agent and a temperature-resistant modifier, wherein the dynamic bond functional monomer comprises at least one of acryloyloxyethyl disulfide, acrylamide acryloyloxyethyl disulfide or anthracene methyl acrylate. The molecular structure of the dynamic bond functional monomer contains a carbon-carbon double bond and a disulfide bond, in the free radical polymerization reaction initiated by the initiator, the carbon-carbon double bond is opened and is subjected to a copolymerization reaction with an SBS chain segment or an acrylate chain segment, so that the disulfide bond enters the polymer chain segment, the dynamic disulfide bond can be reversibly broken and recombined at high temperature, and the dynamic bond functional monomer is obtained. The high-temperature viscoelasticity is maintained, the material is endowed with self-repairing capability, and the problem that the viscoelasticity of the material in the prior art is sharply reduced at high temperature (gt; 120 DEG C) is solved.

Disclosed are a negative electrode binder composition, a negative electrode binder and a preparation method therefor, a negative electrode sheet, a battery cell, and a battery. The negative electrode binder composition comprises the following components: an acrylic monomer, a hydroxydopamine monomer, a long-chain alkyl (meth) acrylate monomer, and a vinyl siloxane monomer.

The invention relates to the technical field of photoinitiators, and provides a triplet-triplet energy transfer (TTET) free radical I type photoinitiation system, a photocuring composition and application thereof. The system comprises a boron dialkylated dipyrromethene free radical I type photoinitiator and a long wave absorption photosensitizer, the photosensitizer is preferably an osmium (II) complex, and the mass ratio of the photosensitizer to the photoinitiator is preferably 1: 5-1: 200. Under the irradiation of a 650-750 nm light source (preferably a 690 nm LED), the photosensitizer enters a triplet state through intersystem crossing and generates TTET to the photoinitiator, so that the photoinitiator is uniformly split in the triplet state to generate free radicals, thereby initiating polymerization / cross-linking curing of monomers such as (methyl) acrylate and the like. The embodiment shows that the double bond conversion rate of the TPGDA can reach more than 80% within 10 minutes under the conditions of LED at 690 nm and 80 mW / cm < 2 >.

The present invention relates to a preparation method for a silicon-carbon composite negative electrode material, comprising the following steps: (P1) co-polymerization: co-dissolving an unsaturated organic acid, an acrylate monomer and an acrylamide monomer in water at a specific ratio, and co-polymerizing same under the action of a sacrificial agent of a saturated organic acid and an initiator to obtain a suspension containing an acrylic copolymer; (P2) alkali treatment: performing an alkali treatment and filtration on the suspension to obtain copolymer particles; (P3) in-situ polymerization: performing in-situ polymerization of phenolic aldehyde on the surfaces of the copolymer particles to obtain a composite resin of a phenolic aldehyde-coated acrylic copolymer; (P4) heat treatment: performing a heat treatment on the composite resin in an oxidizing gas atmosphere to obtain porous carbon; and (P5) performing silicon deposition and carbon coating on the porous carbon to obtain the silicon-carbon composite negative electrode material. When the silicon-carbon composite negative electrode material prepared in the present invention is used in a lithium battery, the volume expansion of silicon can be effectively relieved, and the cycling performance and charge-discharge capacity of a lithium-ion battery are improved.

The invention relates to the technical field of water-based binders, in particular to a preparation method of a high-flexibility positive electrode water-based binder and a product of the high-flexibility positive electrode water-based binder, and the preparation method at least comprises the following steps: dissolving acrylamide in deionized water, and sequentially adding carboxylic acid monomers, acrylonitrile and acrylate monomers to obtain a mixture A; heating the mixture A to 50-60 DEG C under the protection of inert gas, dropwise adding an initiator, filtering, and washing to obtain a solid precipitate; and adding a sodium hydroxide aqueous solution into the solid precipitate to obtain the high-flexibility positive aqueous binder. A polymerization precipitation process is adopted, the solid content of the mixture A is controlled to be 45-60 wt%, the reaction temperature is controlled to be 50-60 DEG C, and the synthesized water-based adhesive has good flexibility and peel strength while maintaining the viscosity of 5000-20000 mPa.s.

The invention relates to the technical field of lubricating oil, and discloses a low-temperature-resistant lubricating oil composition and a preparation method thereof. Mineral oil, modified polymethacrylate, a dispersing agent, an antioxidant and an oil defoaming agent are stirred and mixed and then filtered, and the low-temperature-resistant lubricating oil composition is obtained. The cross-linking agent enables polymethacrylate to form a light cross-linked structure, and stress can be dispersed during shearing; nitrogen atoms in triazinyl, pyridyl, pyrrolidone and Mannich base structures serve as hydrogen bond receptors, the hydrogen bond interaction with hydroxyl on a polymethacrylate molecular chain is enhanced, a physical cross-linked network is formed, and the shear resistance is further improved; in the modified low-temperature-resistant monomer, the glass-transition temperature can be remarkably reduced by high flexibility of silicon oxygen bonds in long straight-chain alkyl and silane groups, so that a molecular chain can still move at a low temperature, and the low-temperature fluidity of the lubricating oil is improved; the cyclic structure of cyclohexyl can effectively interfere with the ordered arrangement of wax crystals, reduce the pour point of the lubricating oil and improve the low-temperature fluidity.

The present application relates to the technical field of lithium ion battery materials, and discloses a low-resistance lithium battery negative electrode sheet and a preparation method therefor. The raw materials for the preparation of the negative electrode sheet comprise at least one of a negative electrode material, a conductive agent, and a binder; the binder comprises a polyacrylate binder, styrene-butadiene rubber, and carboxymethylcellulose; the structural formula of the polyacrylate binder is as shown in formula (I). The preparation method comprises: mixing raw materials according to the raw material ratio of a formula, adding carboxymethylcellulose into deionized water, stirring and dissolving, then sequentially adding a polyacrylate binder emulsion, a conductive agent, and a negative electrode material, stirring and dispersing uniformly, and after the fineness of a slurry is tested to meet standards, adding a styrene-butadiene emulsion, mixing uniformly, defoaming, and filtering to obtain a negative electrode slurry; and coating a negative electrode current collector with the obtained negative electrode slurry, carrying out vacuum baking, and then carrying out rolling compaction to obtain a low-resistance lithium battery negative electrode sheet. The negative electrode sheet of the present invention can significantly reduce the resistance of the electrode sheet without increasing the amount of conductive agent usage.

The invention discloses a low-shrinkage acrylate gel material and a preparation method thereof. The gel material is prepared by mixing a solution A and a solution B according to an equal proportion, the liquid A comprises acrylate, a cross-linking agent, an accelerant and a retarder; the acrylate is a calcium acrylate solution, a magnesium acrylate solution or a mixed solution of calcium acrylate and magnesium acrylate; the concentration of the acrylate in the solution A is 15wt.%-35wt.%; the liquid A is also added with a modified material, and the modified material is selected from at least one of hydroxyethyl ester, chloroprene rubber, polyurethane, polyvinyl alcohol and epoxy resin; the addition amount of the modified material is 1%-5% of the total mass of the solution A; the solution B comprises an initiator and distilled water; the initiator is selected from at least one of ammonium persulfate, hydrogen peroxide and azodiisobutyronitrile; the use amount of distilled water in the solution B is determined according to initiator concentration; by optimizing an acrylate compound system, introducing an anti-shrinkage functional component and accurately controlling a preparation process, the comprehensive improvement of material performance and engineering applicability is finally realized.

The present application relates to an electron beam curable bio-based coating composition and a pre-coated article made therefrom. The electron beam curable bio-based coating composition comprises at least one urethane acrylate, at least one bio-based acrylate monomer, at least one nanocellulose, and optionally a first additional additive wherein the nanocellulose has a specific surface area of at least 200 m2 / g and has an aspect ratio of at least 20. The pre-coated article includes a substrate having at least one major surface; the transition layer is arranged on at least part of the main surface of the base material; and at least one electron beam curing topcoat disposed on at least a portion of the surface of the transition layer wherein the electron beam curing topcoat is formed from the electron beam curable bio-based coating composition according to the present invention.

Disclosed are a lithium metal battery and a method of manufacturing the same, the lithium metal battery comprising a positive electrode, a negative electrode current collector, and a gel-type polymer electrolyte disposed between the positive electrode and the negative electrode current collector wherein the gel-type polymer electrolyte comprises a cross-linked polymer and a liquid electrolyte comprising an organic solvent and a lithium salt, and the cross-linked polymer is a product of a reaction between a multifunctional cross-linking agent having three or more functional groups and a (meth) acrylate-based compound having a polyethylene glycol moiety.

The invention relates to the technical field of high polymer materials, in particular to a low-viscosity self-curing polyurethane acrylate composition and a preparation method thereof.The low-viscosity self-curing polyurethane acrylate composition is prepared from, by mass, (a) 50-80 parts of polyurethane acrylate prepolymer; (b) 1-10 parts of functional particles; (c) 10-30 parts of a reactive diluent; (d) 0.1-2 parts of a visible light initiator; (e) 0.1-2 parts of a leveling agent; and (f) 0.1-1 part of a deoxidizing auxiliary agent. According to the invention, light response is expanded to a visible light wave band, natural light can trigger free radical polymerization and disulfide bond oxidative cleavage through component and structural design to realize controllable release of water, the system viscosity of an acrylate group is further reduced to 1500mPa. S or below, and the adhesive property and weather resistance are better after curing.

The invention discloses a preparation method of a grafted polymer brush copolymer, which comprises the following steps: S1, mixing a styrene monomer, N-4-vinyl phenyl-N, N-dimethylamine, toluene and AIBN, heating, and reacting to generate a first section of polymer; and S2, mixing the first-section polymer with an acrylate monomer and an imide compound, and continuously reacting under an illumination condition to obtain the polymer brush copolymer. AIBN can be decomposed at high temperature to generate free radicals, polystyrene monomers are initiated to polymerize, and a first-section polymer is formed. The imide compound and a nitrogen-containing initiation site form a charge transfer complex under an illumination condition. The charge transfer complex can be dissociated to generate free radicals formed by nitrogen-containing initiation sites, and then the free radicals formed by the nitrogen-containing initiation sites initiate polymerization of acrylate monomers to obtain a grafted polymer brush copolymer. The preparation method is simple in reaction condition, simple and convenient to operate and suitable for industrial large-scale production.

The invention discloses a hydrolysis-resistant low-temperature-resistant bi-component nano acrylate grouting plugging material and a preparation method thereof. The plugging material is prepared by mixing a component A and a component B according to a volume ratio of 1: 1, the component A is prepared from the following components in parts by mass: 25 to 40 parts of acrylate, 12 to 20 parts of hydrolysis-resistant modified component, 3 to 8 parts of low-temperature-resistant functional component, 8 to 15 parts of nano modified filler, 0.3 to 0.8 part of cross-linking agent, 1.5 to 3.0 parts of accelerant, 0.3 to 0.6 part of pH regulator and 40 to 50 parts of deionized water; the component B is prepared from the following components in parts by mass: 1.5 to 2.5 parts of a composite initiator, 0.2 to 0.5 part of a low-temperature catalyst, 0.8 to 1.5 parts of a dispersion stabilizer, 0.3 to 0.8 part of a hydrolysis-resistant auxiliary agent and 90 to 100 parts of deionized water; the plugging material meets the following performance indexes: the 28d compressive strength is greater than or equal to 6.5 MPa, the strength retention rate is greater than or equal to 85% when the plugging material is soaked in distilled water at 50 DEG C for 30 days, the strength loss is less than or equal to 10% when the plugging material is frozen and thawed for 30 times at-30 DEG C, the 28d bonding strength with a concrete base material is greater than or equal to 2.5 MPa, the 0.1 mm micro-crack penetration depth at 25 DEG C is greater than or equal to 60 mm, and the setting time at 25 DEG C is 30 seconds to The method can effectively meet the requirement for leakage water treatment in the high-humidity and high-water-pressure environment of underground engineering in the cold region.

A solvent-type polyacrylate pressure-sensitive adhesive having a high solid content, a preparation method therefor, and the use thereof. The pressure-sensitive adhesive contains an acrylic resin polymer, the acrylic resin polymer being formed by polymerizing monomers under the actions of an initiator and a chain transfer agent in an organic solvent, the solid content of the acrylic resin polymer being 60-75%, the mass-average molecular mass of the acrylic resin polymer being 0.2-0.4 million, and the polydispersity of same being 1-1.3. The pressure-sensitive adhesive keeps excellent mechanical properties in the case of the ultra-high solid content, 180° peeling strength being 10-20 N / 25 mm, tack being > 2# ball, and holding power being > 72 hours.

The present application relates to the technical field of resin coating, and particularly relates to a preparation method of modified acrylic resin and application thereof, which comprises the following steps: firstly, hydrolysis and condensation of multiple organosilicon alkoxyl monomers, then grafting with epoxy resin to obtain organosilicon-epoxy resin containing vinyl; subsequently, under the protection of nitrogen, a premixed solution of styrene, multiple acrylate monomers, initiator and solvent is added dropwise into a reaction kettle containing the resin, and after polymerization by staged heat preservation, parameters are adjusted to obtain the modified acrylic resin. The resin has a ternary hybrid structure of acrylic acid, epoxy and organosilicon through grafting, condensation and copolymerization, and has good film forming property, high adhesion, excellent high temperature resistance and flexibility. The coating prepared by using the resin can realize normal temperature self-drying, and the coating layer is dense and smooth, has strong adhesion, good corrosion resistance and impact resistance, and can withstand high temperature and cold cycle, and is suitable for protection of parts which need long-term high temperature and corrosion resistance.