1465 results about "Addition reaction" patented technology

The invention discloses an adhesive containing epoxy-terminated polyurethane epoxy resin as well as a preparation method and application of the adhesive. The adhesive comprises the following components in parts by weight: 10-15 parts of epoxy resin, 70-75 parts of epoxy-terminated polyurethane epoxy resin, 19-21 parts of an amine curing agent and 8-15 parts of heat-conducting filler, wherein the epoxy-terminated polyurethane epoxy resin is obtained by reacting a polyurethane prepolymer and epoxy resin, NCO of the polyurethane prepolymer and hydroxyl of the epoxy resin are subjected to an addition reaction, and after the reaction is finished, NCO of a system is eliminated by adopting a small-molecule epoxy compound; the polyurethane prepolymer is obtained by reaction of isocyanate and polyether polyol with flexible chain segments. According to the adhesive, the curing heat release peak value is reduced, the toughness is improved, meanwhile, the high strength is kept, the foaming problem is avoided, the defects that a traditional epoxy adhesive is high in heat release and poor in toughness are overcome, and the adhesive is suitable for the fields such as aerospace and electronic and electric appliances which have strict performance requirements.

The invention relates to the technical field of organic polymer adhesives, and particularly discloses a modified castor oil-based polyurethane adhesive as well as a preparation method and application thereof. The adhesive comprises two components, and the component A comprises the following components in parts by weight: 30.0-50.0 parts of modified castor oil and 0.0-30.0 parts of refined castor oil; the component B is prepared from the following components in parts by weight: 30.0 to 50.0 parts of polyisocyanate or a polyisocyanate modifier and 0.00 to 0.05 part of a dewatering agent; the modified castor oil is prepared from refined castor oil and cysteamine through a sulfydryl-alkene addition reaction. Amido of the modified castor oil is alkalescent, and the reaction speed of the modified castor oil and isocyanate groups is high; hydrogen bonds are easily generated between urea bonds generated by the reaction of amino groups and isocyanate groups, so that the adhesive is endowed with thixotropy and high strength. The adhesive disclosed by the invention is simple in composition, high in reaction speed and good in thixotropy and bonding strength.

The invention relates to the technical field of in-vitro diagnostic kits, in particular to carboxyl polystyrene microspheres, a preparation method and application of the carboxyl polystyrene microspheres in a kit for quantitatively detecting MxA. The preparation method of the carboxyl polystyrene microspheres comprises the steps that firstly, polystyrene microspheres with the surface rich in aldehyde groups are prepared through a soap-free emulsion polymerization method; then carrying out a Schiff alkali reaction with 2-aminoethyl methacrylate hydrochloride to carry out double bond modification on the surface of the microsphere, and meanwhile, improving the hydrophilicity of the microsphere by an ester group and an imino group; and finally, carrying out sulfydryl-double bond addition reaction on the polystyrene microspheres and mercaptosuccinic acid to generate the polystyrene microspheres rich in carboxyl on the surfaces. The carboxyl polystyrene microspheres prepared by the invention can improve the binding efficiency of latex and an MxA antibody, so that the detection sensitivity is improved, the purpose of high-sensitivity quantitative detection of MxA protein can be achieved, and the detection time is greatly shortened.

The invention relates to the technical field of PC resin flexibilizers, and discloses a shell-core structure styrene-acrylic resin modified organic silicon elastomer flexibilizer as well as a preparation method and application thereof in order to solve the problems that an organic silicon material and PC resin are poor in intersolubility, a traditional flexibilizer is poor in low-temperature toughening performance and the like. Comprising the following steps: uniformly mixing hydrogen-containing silicone oil, vinyl silicone oil, a third alkenyl functional component and a catalyst, and pre-emulsifying under the action of a surfactant and a thickener to obtain an organic silicon pre-emulsion SiE; uniformly mixing an alkenyl phenyl compound, acrylate and / or a cross-linking agent, adding a molecular weight regulator and an oil-soluble initiator, and pre-emulsifying under the action of a surfactant and water to obtain a styrene-acrylic pre-emulsion SAE; the preparation method comprises the following steps: firstly, preparing an organic silicon pre-emulsion, then heating the organic silicon pre-emulsion to carry out a water-phase hydrosilylation addition reaction, then dropwise adding the styrene-acrylic pre-emulsion to carry out suspension emulsion copolymerization, and then demulsifying and drying to obtain the styrene-acrylic resin modified organic silicon elastomer toughening agent with the core-shell structure.

The invention discloses a method for synthesizing a dichloroacetyl compound, which comprises the following steps: tetrachloroethylene and an acid are subjected to an addition reaction at 100-200 DEG C to obtain an adduct, then the adduct is subjected to an acidolysis, hydrolysis or alcoholysis reaction to obtain the dichloroacetyl compound, the acid for the addition reaction is at least one of sulfuric acid, trifluoromethanesulfonic acid, methanesulfonic acid and phosphoric acid, and the acid for the alcoholysis reaction is at least one of sulfuric acid, trifluoromethanesulfonic acid, methanesulfonic acid and phosphoric acid. The molar ratio of the tetrachloroethylene to the acid is 1: (1-10). By controlling the types of acids and increasing the temperature of the addition reaction, the addition reaction of tetrachloroethylene and acids in the absence of a catalyst is realized. Double bonds of tetrachloroethylene and hydrogen protons are subjected to an addition reaction in a strong acid environment to form a cationic intermediate, then the cationic intermediate is combined with acid radical anions to form an adduct, and the adduct intermediate is high in activity, unstable and free of separation and can be directly subjected to a hydrolysis reaction, an acidolysis reaction or an alcoholysis reaction with another substrate (such as water, acid or alcohol) respectively. The synthesis of dichloroacetyl series compounds is realized, and the route has universality and diversity.

The invention discloses a high-strength and high-resilience TPE (thermoplastic elastomer) and a preparation method thereof in the technical field of high polymer materials, and the elastomer is prepared by taking a hydrogenated styrene block copolymer as a matrix and matching with a polyolefin rigid phase, plasticizing oil and a specific additive. The method is characterized in that two self-made reaction type modifiers are introduced, wherein one self-made reaction type modifier is a core-shell nano reinforcing agent containing an epoxy functional group and polyhedral oligomeric siloxane, and the other self-made reaction type modifier is a furan maleimide bifunctional dynamic cross-linking agent. The nano reinforcing agent is prepared through silane hydrolysis and amination reaction, and can react with a matrix for grafting, so that the strength and creep resistance of the material are remarkably improved; the dynamic cross-linking agent is synthesized through step-by-step isocyanate addition reaction, a cross-linked network can be reversibly formed in the processing process, and the material is endowed with extremely high rebound resilience and low permanent deformation. The obtained product has high strength, high resilience and excellent processability, and is especially suitable for high-end fitness equipment.

The invention relates to the technical field of organic silica gel adhesives, in particular to a two-component adhesive for bonding cured silica gel and uncured silica gel as well as a preparation method and application of the two-component adhesive. The adhesive is composed of an agent A and an agent B, wherein the agent A comprises base glue, vinyl silicone resin, low-viscosity vinyl silicone oil, a titanium catalyst, a platinum catalyst and a diluent; the agent B comprises base rubber, hydrogen-containing silicone oil, three silane coupling agents, a 2-ethynyl cyclohexanol inhibitor and two intermediates prepared through addition reaction. The agent A and the agent B are used after being mixed according to the mass ratio of 1: 1, can be bonded with unvulcanized silica gel and jointly vulcanized after being pre-cured for 2 hours at normal temperature or subjected to heat treatment for 30 minutes at 70 DEG C, and are high in peel strength, excellent in humidity and heat resistance and suitable for high-reliability silica gel compounding in the fields of electronics, medical treatment and the like.

The invention discloses a method for continuously synthesizing long-chain alkyl modified silicone oil, which belongs to the technical field of organic synthesis, and comprises the following specific steps: quickly mixing hydrogen-containing silicone oil and long-chain olefin in a micro-mixer, carrying out hydrosilylation reaction in a packed tubular reactor, controlling the reaction residence time by using the tube length, and continuously synthesizing the long-chain alkyl modified silicone oil. Controlling the material ratio by utilizing the reaction liquid flow ratio, controlling the reaction temperature by utilizing a water bath, and obtaining a mixed solution containing modified silicone oil after the reaction is completed; and decoloring the mixed solution by using activated carbon, and then carrying out reduced pressure rotary evaporation on the decolored mixed solution to finally obtain a modified silicone oil pure product. The method realizes continuous synthesis of the modified silicone oil, and has the advantages of simple process, short reaction time and high reaction safety.

The invention belongs to the technical field of oilfield chemistry, and particularly relates to application of a hyperbranched zwitterionic polymer in high-temperature and high-salinity drilling fluid. The hyperbranched zwitterionic polymer is prepared by carrying out Michael addition reaction on polyethyleneimine and a monomer which is neutralized by alkali and contains double bonds and sulfonic acid groups; the polymer has a hyperbranched structure, and the amphoteric ion characteristic that an amino group from polyethyleneimine on a molecular chain and a sulfonic acid group from a monomer form an inner salt structure; the hyperbranched zwitterionic polymer is used as an inhibitor and a viscosity reducer of the drilling fluid. According to the hyperbranched zwitterionic polymer provided by the invention, the salt tolerance and high-temperature stability of the polymer are enhanced by introducing a sulfonate group; the polymer is endowed with low viscosity and high adsorption capacity through a hyperbranched structure, the viscosity of the drilling fluid can be effectively reduced, and clay hydration is inhibited; clay particles are stabilized through electrostatic interaction by zwitterionic characteristics, and the rheological property of the drilling fluid is optimized.

The present invention relates to the technical field of structural adhesives, and provides a high-stability low-exothermic structural adhesive system material, a preparation method therefor and a use thereof. The mass ratio of a resin component to a curing agent component in the structural adhesive system material is 10:(4-5). The resin component comprises 60-80 parts of bisphenol-A epoxy resin, 2-15 parts of bisphenol-F epoxy resin, 10-20 parts of an inorganic reinforcing filler, and 3-8 parts of a thickening thixotropic agent. The curing agent component comprises 56-115 parts of an amine curing agent, 5-20 parts of an inorganic reinforcing filler, 5-9 parts of a thickening thixotropic agent, and 4-60 parts of a modified amine-based rheology additive. The modified amine-based rheology additive is obtained by means of a pre-reaction, at a temperature of 25-150ºC, between an amine substance and a substance capable of undergoing an addition reaction with the amine substance. The present invention solves the problems of how to improve the stability of the structural adhesive and ensure smooth and uniform heat release during a curing exothermic process while meeting mechanical performance requirements.

The invention relates to the technical field of functional coatings, in particular to a high-strength rain erosion resistant coating and a preparation method thereof.The high-strength rain erosion resistant coating is composed of polyaspartic acid ester resin (A) and a high-elasticity aliphatic polyurea curing agent (B), 2, 3-bis (aminomethyl) cyclohexane, chain-extended diamine and diethyl maleate are subjected to an addition reaction to prepare the high-molecular polymer; the component B is synthesized from dicyclohexylmethane diisocyanate, isophorone diisocyanate, polycarbonate diol and a hexamethylene diisocyanate tripolymer step by step; the high-strength rain-erosion-resistant coating is obtained by adding the functional filler, the flatting agent, the ultraviolet absorbent and the environment-friendly solvent into the component A and the component B in a stirring reaction kettle and stirring in a heat preservation mode, a coating film of the high-strength rain-erosion-resistant coating has excellent mechanical strength, meanwhile, the high-strength rain-erosion-resistant coating is more resistant to rain erosion, construction is convenient and fast, and the high-strength rain-erosion-resistant coating is remarkably superior to a commercially available optimal protective film; the method can be widely applied to outer surface protection of high-end equipment such as aviation, wind power and high-speed rails.

The present invention is an addition-curable silicone composition containing components (A) to (C): (A) An addition reaction product of an organopolysiloxane represented by formula (1) and a compound represented by formula (2), the addition reaction product having two addition-reactive carbon-carbon double bonds per molecule. (1) (R1 is a C1-12 monovalent hydrocarbon group, R2 is a methyl group or a phenyl group, a is an integer of 0-50, and b is an integer of 0-300. ), (2) (R3 represents a C1-12 divalent hydrocarbon group.), (B) an organosilicon compound having a hydrogen atom bonded to at least two silicon atoms per molecule, and (C) a hydrosilylation reaction catalyst. Thus, provided are an addition-curable silicone composition that has high transparency and a high refractive index and yields a cured product having high strength and high elongation and a highly reliable optical semiconductor device sealed by a cured product thereof.

The invention discloses a novel method for synthesizing 1, 3-diketone organic matters, which comprises the following steps: by taking acyl chloride and silyl enol ether as raw materials, generating acyl free radicals through photo-induced copper catalysis, and carrying out free radical addition reaction on the acyl free radicals and silyl enol ether, thereby efficiently constructing 1, 3-diketone compounds. Compared with strong base, oxidant, high temperature and expensive metal catalyst required by the existing method, the method provided by the invention adopts the cheap and high-yield copper catalyst, so that the production cost is reduced, and the economic benefit is improved. In addition, the method has mild reaction conditions, easily available catalysts and raw materials, utilizes clean and sustainable light energy as driving force, is simple and convenient to operate, and is suitable for large-scale production. The invention provides an economic and environment-friendly innovative way for synthesizing the 1, 3-diketone compound, and has a wide application prospect.

The invention belongs to the field of flame-retardant composite materials, and particularly relates to a multifunctional flame retardant and application thereof in epoxy resin. The method comprises the following steps: firstly, carrying out nucleophilic substitution reaction on tert-butyldimethylsilyl chloride and syringaldehyde to obtain a primary intermediate product; carrying out condensation reaction on the primary intermediate product and an amino-containing compound to form a secondary intermediate product with a Schiff base structure; and finally, carrying out addition reaction on the secondary intermediate product and a specific phosphorus-containing reagent to successfully prepare the target flame retardant. Researches show that the flame retardant is remarkable in efficiency, can effectively improve the limit oxygen index (LOI value) and the vertical combustion test (such as UL-94) grade of a material after being applied to an epoxy resin system, and endows the composite material with excellent light transmission, anti-dripping performance and good ultraviolet shielding characteristic.

This invention discloses a method for preparing a high-temperature resistant ink, belonging to the field of ink technology. The tin-alkyl organosilicon resin prepared by this invention can increase the crosslinking density of the ink, further enhancing its heat resistance. The amino-acrylic acid addition reaction of 3-(methacryloyloxy)propyltrimethoxysilane and 2-aminodiphenyl sulfide forms stable silicon-nitrogen bonds. The formation of these silicon-nitrogen bonds helps to improve the bonding force between the silane and ink molecules, thereby improving the overall thermal stability of the ink. Tin alkylamines can increase the crosslinking density of the ink, further enhancing its heat resistance. The ink of this invention has excellent heat resistance, with an adhesion grade of 1. After firing at 500℃, the ink surface remains good, without cracking, reduced adhesion, peeling, color change, or edge cracking.

The invention belongs to the technical field of perfume preparation processes, and particularly relates to a preparation process of fragrance lasting type perfume ligustral, which comprises the following steps: a catalytic dehydration step: mixing isohexylene glycol and a composite catalyst according to a mass ratio of 100: (0.8-1.2), and carrying out a catalytic dehydration reaction under a gradient heating condition to generate a methyl pentadiene mixture; a Diels-Alder addition step: carrying out an addition reaction on acrolein and a methyl pentadiene mixture according to a mass ratio of 1: (1.05-1.15) under a sectional temperature control condition, controlling the reaction pressure to be 0.25-0.35 MPa, carrying out a heat preservation reaction for 2 hours, and cooling to obtain a ligustral crude product; and a three-tower series rectification step: separating and purifying the ligustral crude product after the addition reaction through a light component removal tower, a middle component removal tower and a refining tower in sequence to obtain a ligustral finished product. By optimizing a catalytic system, reaction conditions and a separation process, the purity and aroma durability of the product are improved.

The invention discloses a microcapsule material, a microcapsule using the microcapsule material and a preparation method of the microcapsule, and relates to the technical field of daily chemical products. The microcapsule material comprises an addition polymer formed by a ring-opening reaction of epoxy resin and bio-based polyamine, poly (beta-amino ester) formed by a Michael addition reaction of acrylate and phenyl polyamine, and at least one cationic polymer containing quaternary ammonium groups. The microcapsule material shows certain biodegradability, the biodegradation rate of the microcapsule material exceeds 20% within 28 days, and the applied microcapsule can effectively meet the friction fragrance release performance requirement required by essence wrapping, so that after the obtained essence-encapsulated microcapsule is stored in a lotion at 45 DEG C for 28 days, the fragrance release performance of the microcapsule material is not influenced by the friction fragrance release performance, and the fragrance release performance of the microcapsule material is not influenced by the friction fragrance release performance. The excellent friction aroma releasing capability and the adhesion capability on the fabric can still be maintained, and the excellent thermal stability is shown.

The invention belongs to the technical field of coatings, and particularly relates to a two-component flexible road marking coating and a preparation method thereof. The two-component flexible road marking coating comprises a component A and a component B in a mass ratio of (2.5-3): 1, wherein the component A comprises 5-10 parts of bisphenol epoxy resin with the epoxy value of 0.4-0.55, 40-50 parts of polymer dihydric alcohol, 0.1-0.3 part of a catalyst, 10-15 parts of pigment, 15-20 parts of filler, 5-10 parts of an anti-skid material, 25-35 parts of internally mixed glass beads, 0.5-1 part of a dispersing agent, 0.5-1 part of a defoaming agent, 3-5 parts of a plasticizer and 30-60 parts of a solvent; the component B is a curing agent composed of modified isocyanate and an isocyanate tripolymer according to the mass ratio of (5-8): 1; the modified isocyanate is a compound which is prepared by carrying out hydrosilylation reaction on unsaturated isocyanate and siloxane with a silicon atom number of 2-4 and a hydrogen-containing terminal, and two ends of the modified isocyanate are isocyanato; the coating has excellent brittle fracture resistance, water resistance and wear resistance at low temperature.

The invention discloses a preparation method of a photo-thermal conversion-phase change heat storage polyurethane flexible film, and relates to the technical field of polyurethane phase change materials. According to the invention, polyethylene glycol is used as a polymeric monomer and a phase change heat storage substrate, diisocyanate and dimethylolbutyric acid are used as reaction monomers, any one of 3, 3-dithio-bis-propionyl hydrazide or (R, R)-3, 3 '-diseleno-bis (2-aminopropionic acid) is used as a cross-linking agent, and transition metal carboxylate and a nano photo-thermal conversion agent are introduced to prepare the phase change heat storage material. And the polyurethane flexible film with photo-thermal conversion-phase change heat storage is prepared. A hydrazide group at the tail end of a cross-linking agent and an isocyanate group are subjected to nucleophilic addition reaction to generate a hydrazide-urea structure of which the main chain contains disulfide bonds and constructs multiple hydrogen bonds, and meanwhile, a metal carboxylate coordination bond is introduced, so that the film is endowed with an excellent mechanical response effect in a wide temperature range; the nano photo-thermal conversion agent is added into the system, so that the system has good photo-thermal conversion performance.

The invention provides a polyamide hot melt adhesive containing dynamic reversible covalent bonds and a preparation method thereof, and belongs to the field of high polymer materials. Caprolactam and nylon 66 salt are used as raw materials, a furan ring and a carbon chain with a specific length are introduced, and the polyamide hot melt adhesive containing the dynamic reversible covalent bond is obtained through polymerization with maleimide and a derivative thereof. The melting point of the polymer can be regulated and controlled by regulating and controlling the carbon chain length of aliphatic diamine introduced into the xF salt, a furan ring in the xF salt is subjected to DA addition reaction with maleimide and a derivative thereof, dynamic reversible sites are provided, crosslinking between molecular chains is formed, a net system is formed, and the bonding strength of the material can be greatly improved. By adjusting the ratio of the xF salt to the maleimide and the derivative thereof, the reversible crosslinking behavior of the polymer can be adjusted, and finally the hot melt adhesive which has a lower melting point and excellent bonding strength and can be repeatedly used and recycled is obtained.

The invention discloses a preparation method and application of a catalyst based on pyridine ionic liquid, and belongs to the technical field of catalyst preparation. According to the invention, a hydrolysis reaction of a silane coupling agent is utilized to prepare a silicon oxide nanotube containing a pyridine unit, and then a quaternization reaction is carried out to obtain the catalyst based on the pyridine ionic liquid. The catalyst has a high specific surface area and a rich pore channel structure, exposure of active sites and contact of the active sites and reactants are facilitated, and the catalytic rate is increased. Meanwhile, the silicon oxide nanotube contains hydroxyl, and can cooperate with a pyridine ionic liquid site to catalyze a carbon dioxide cycloaddition reaction. The obtained catalyst can catalyze the reaction of carbon dioxide and an epoxy compound to prepare cyclic carbonate under solvent-free and metal-free conditions, and the catalyst is easy to recover and simple in product purification, and has a good application prospect.

The invention relates to a cationic hydrophilic softener for chinlon dyeing in one bath as well as a preparation method and application of the cationic hydrophilic softener. The method comprises the following steps: S1, carrying out hydrosilylation reaction on end hydrogen-containing silicone oil and allyl epoxy polyether under the action of a platinum catalyst; s2, polyol containing hydroxyl and polyisocyanate are subjected to a reaction under the action of a first catalyst, and a-NCO-terminated polyurethane prepolymer is generated; a chain extender containing a tertiary amine group is added into the polyurethane prepolymer for a reaction; adding the epoxy-terminated polyether silicone oil obtained in the step S1 for reaction, and then adding acid for neutralization to obtain cationic polyurethane modified silicone oil; and S3, emulsifying. The softening agent prepared by the invention has excellent stability in a high-temperature acid dye bath, and does not demulsify and stick to a vat; the compatibility with acid dyes is good, and color spots and color spots can be effectively avoided; and after use, the chinlon fabric can be endowed with lasting, smooth and soft hand feeling and good hydrophilicity, and meanwhile, the original whiteness of the fabric is kept.

The application provides a hindered amine light stabilizer and a preparation method thereof, and the preparation method comprises the following steps: putting N, N-bis(2, 2, 6, 6-tetramethyl-4-piperidyl) 1, 6-hexanediamine and an organic solvent into a reaction bottle, heating to 50-80 DEG C, adding methyl acrylate into the system dropwise, obtaining an intermediate I through an addition reaction, and then obtaining a crude product through an ester exchange reaction of the intermediate I and tetramethylpiperidinol in the presence of a catalyst and an organic solvent, washing with water, decoloring, filtering, cooling and crystallizing, filtering and drying to obtain the product; the light stabilizer obtained by the application has multiple hindered amine functional groups, has good heat resistance and extraction resistance, and has good compatibility with resin.

The invention belongs to the field of adhesives, and relates to an acrylate-siloxane modified polyurethane adhesive as well as a preparation method and application thereof. The acrylate-siloxane modified polyurethane adhesive contains a silane modified polyurethane prepolymer, an acrylate compound, a photoinitiator and an optional rheology modifier, wherein the silane modified polyurethane prepolymer, the acrylate compound, the photoinitiator and the optional rheology modifier are used as raw materials; the silane modified polyurethane prepolymer is prepared by the following steps: firstly, carrying out addition polymerization reaction on a polyisocyanate compound and a low-viscosity polyol compound, and then carrying out addition reaction on the obtained polyurethane prepolymer and a silane coupling agent containing reactive hydrogen. The low-viscosity polyol compound has a glass transition temperature of 0 DEG C or less and a melting point of 40 DEG C or less; the functionality of at least a portion of the acrylate compound is bifunctional or less, and the glass transition temperature is 20 DEG C or more. The acrylate-siloxane modified polyurethane adhesive provided by the invention has the characteristics of low viscosity, no bubble and high curing speed.

The invention relates to the technical field of organic-inorganic hybrid materials, in particular to an antifouling organic-inorganic hybrid material, a preparation method, a photocuring antifouling material and a product. The organic-inorganic hybrid material is prepared by carrying out a ring-opening addition reaction on an epoxy group of epoxy polyhedral oligomeric silsesquioxane and polydimethylsiloxane with an amino group or perfluoropolyether with a carboxyl group. According to the scheme provided by the invention, the coating has high thermal stability and structural rigidity endowed by epoxy polyhedral oligomeric silsesquioxane and excellent low surface energy antifouling property endowed by amino-containing polydimethylsiloxane or carboxyl-containing perfluoropolyether, and the defect that a pure epoxy polyhedral oligomeric silsesquioxane coating does not have antifouling property is effectively overcome.

The invention provides a method for preparing high-purity acrylate by removing trace impurity aldehyde, which comprises the following steps: mixing crude acrylate with a polymerization inhibitor to form an organic phase; adding an aqueous solution of a dealdehyding agent into the organic phase to form an oil-water two-phase system; the oil-water two-phase system is forcibly stirred for 0.1-2.0 hours at the temperature of 20-40 DEG C, so that the impurity aldehyde and the dealdehyding agent are subjected to nucleophilic addition reaction, and a generated aldehyde-dealdehyding agent addition product is dissolved in a water phase; standing and layering the reacted material, separating and removing a water phase to obtain an organic phase without impurities; carrying out reduced pressure rectification on the organic phase after impurity removal to obtain a high-purity acrylate product with the total aldehyde content lower than 50ppm; wherein the aldehyde removing agent is sodium hydrogen sulfite, potassium hydrogen sulfite, calcium hydrogen sulfite, ammonium hydrogen sulfite or a mixture of any two or more of the sodium hydrogen sulfite, the potassium hydrogen sulfite, the calcium hydrogen sulfite and the ammonium hydrogen sulfite. The method is efficient, economical, free of solid deposition and easy for industrial continuous operation.

A two-part coatings system is provided. The system includes a resin component and a crosslinking component. The resin component includes a mixture of an epoxy resin and a polyurethane resin. The crosslinking component includes a curing agent and a catalyst. The polyurethane resin includes a donor for a Michael addition reaction and an acceptor for a Michael addition reaction. The catalyst is configured to facilitate a Michael addition reaction between the donor and the acceptor of the polyurethane resin. The curing agent is configured to react with the epoxy resin.

The invention relates to the field of organic polymer synthesis and new energy lithium batteries, in particular to a water-based adhesive, a preparation method of the water-based adhesive and application of the water-based adhesive to a lithium ion battery. The invention relates to a water-based adhesive which is obtained by reacting a polycarboxylic acid polymer with a compound containing an epoxy group. Carboxyl groups in polycarboxylic acid react with epoxy groups in epoxy alcohol through carboxylic acid-epoxy addition reaction, and the adhesive has high water solubility due to the fact that the adhesive contains carboxyl groups and hydroxyl groups; and the current trend that the negative electrode water-based adhesive replaces the oily adhesive is met. Through hydroxyl modified polycarboxylic acid, the flexibility of an adhesive film is improved, the electrochemical performance of a battery cell is greatly improved, the hydroxyl modified polycarboxylic acid type water-based adhesive is applied to a silicon negative electrode to assemble a button cell, and it can be found that the long cycle performance, the rate capability and the capacity retention ratio of the cell are greatly improved.

The invention belongs to the technical field of epoxy resin, and particularly relates to double-dynamic-bond synergistic exchange epoxy resin as well as a preparation method and application thereof. The preparation method of the double dynamic bond synergistic exchange epoxy resin comprises the following steps: adding aromatic dialdehyde and amino-containing disulfide into a solvent for condensation reaction, and filtering and drying to obtain a double dynamic bond curing agent; the preparation method comprises the following steps: adding the double-dynamic-bond curing agent into epoxy resin, carrying out ring-opening addition reaction, carrying out gradient heating curing, and cooling to room temperature, the aromatic dialdehyde is terephthalaldehyde, isophthalaldehyde or o-phthalaldehyde, and the amino-containing disulfide is 2, 2 '-diaminodiphenyl disulfide or 4, 4'-diaminodiphenyl disulfide. The invention designs and synthesizes a double-dynamic covalent bond curing agent containing an imine bond and a disulfide bond, and is used for constructing a novel degradable and self-healing epoxy resin. The material maintains good thermal stability and insulation performance, and realizes degradation and self-healing functions at the same time.

The invention relates to a preparation method of octafluorocyclobutane, which comprises the following steps: mixing hexafluorocyclobutene with preheated nitrogen trifluoride, carrying out addition reaction on the mixed gas, and condensing and collecting the octafluorocyclobutane after the reaction is completed. According to the method, octafluorocyclobutane is prepared by using nitrogen trifluoride, continuous production of octafluorocyclobutane with the purity being 99 wt% or above can be achieved, the preparation method has the advantages of being low in raw material cost, simple in process, low in energy consumption, simple in product separation, good in selectivity and convenient to purify, and amplified continuous production can be achieved easily.