68 results about "Dibasic ester" patented technology

The invention relates to the technical field of coatings, and provides a nano anti-corrosion waterproof coating capable of resisting high and low temperatures and acid and alkali, which is prepared from the following raw materials in parts by mass: 30 to 40 parts of pure acrylic emulsion, 10 to 20 parts of modified nano silicon dioxide, 2 to 4 parts of nano titanium dioxide, 3 to 6 parts of nano zinc oxide, 2 to 4.4 parts of auxiliaries and 5 to 9 parts of water, the modifier comprises dibasic ester and / or dihydric alcohol. According to the technical scheme, the problem that the performance of the nano coating is low due to the fact that the nano particles are easy to agglomerate and are not uniformly dispersed in the base material in the prior art is solved.

The EPDM composition is a rubber composition obtained by blending carbon black, a plasticizer and a cross-linking agent in an ethylene-propylene-diene ternary copolymer rubber, the plasticizer is a polyol ester, the polyol ester is a reaction product of a neopentyl polyol and a monocarboxylic acid, and the amount of the plasticizer in the composition is 5-22 wt%. The EPDM composition does not damage the mixing property and the processability, and the hardness change of the obtained cross-linked product after a thermal aging test is the same as that of the cross-linked product under the condition of matching the same parts of alpha-olefin oligomer, and is greatly improved compared with that of the cross-linked product under the condition of matching aliphatic dibasic acid ester.

The invention discloses a cold-resistant material, which is prepared from the following raw materials in parts by weight: 20 to 25 parts of EVA (Ethylene Vinyl Acetate) with the VA (Vinyl Acetate) content of 28 percent, 15 to 20 parts of EVA with the VA content of 18 percent or 33 percent, 10 to 15 parts of cold-resistant mixture, 15 to 20 parts of POE (Polyolefin Elastomer), 5 to 6 parts of ethylene propylene diene monomer, 6 to 8 parts of wear-resistant agent, 0.3 to 0.5 part of stearic acid, 0.5 to 0.6 part of zinc stearate, 0.8 to 1.0 part of zinc oxide, 0.35 to 0.40 part of bridging agent and 3.0 to 3.2 parts of high-temperature foaming agent, wherein the cold-resistant mixture comprises 50-60 parts of SEBS, 20-30 parts of aliphatic dibasic acid ester, 10-20 parts of EVA with the VA content being 40% and 10-20 parts of naphthenic oil, the content of styrene in the SEBS is 20%, the content of butadiene is 80%, the raw materials are sequentially subjected to mixing, granulation, secondary mixing and secondary granulation, and the cold-resistant material with the good cold resistance is obtained and can be applied to shoe sole manufacturing.

The invention provides a preparation method of a hydrogenated cycloolefin polymer, which comprises the following steps: reacting a cycloolefin polymer with hydrogen in the presence of a hydrogenation catalyst and a hydrogenation aid to obtain the hydrogenated cycloolefin polymer, the hydrogenation auxiliary agent is selected from one or more of aliphatic dibasic acid esters, phthalate esters and benzene polyacid esters. Compared with the prior art, in the presence of the hydrogenation catalyst and the hydrogenation auxiliary agent, the cycloolefin polymer and the hydrogen are subjected to hydrogenation reaction, and an induced dipole is induced in the adjacent cycloolefin polymer through the hydrogenation auxiliary agent molecule with an inherent dipole; the molecular attraction between the induced dipole and the inherent dipole destroys the entanglement of the original molecular chain, and the friction force between the cycloolefin polymer molecules is reduced, so that the viscosity between the polymers is reduced, and the mass transfer effect of the reaction is improved; meanwhile, intramolecular electron conjugation can be inhibited, double bonds in molecules in the hydrogenation process can be damaged more easily, the hydrogenation efficiency is improved, and then the production efficiency is improved.

The invention relates to the technical field of shape memory materials, and discloses a biodegradable shape memory material and a preparation method thereof.The method comprises the steps that 1, an organic matter containing acyloxy and dihydric alcohol are subjected to an esterification reaction in the presence of a first catalyst and an inactive atmosphere; then carrying out condensation polymerization to obtain matrix resin; wherein the organic matter containing the acyloxy group comprises aliphatic dibasic acid and aromatic dibasic acid and / or aromatic dibasic ester in a molar ratio of (20-80): (20-80); and (2) in the presence of a second catalyst and an inactive atmosphere, the matrix resin and aliphatic diisocyanate are subjected to a first reaction, a product of the first reaction and aliphatic dihydric alcohol are subjected to a second reaction, and the weight ratio of the aliphatic diisocyanate to the matrix resin is (0.01-0.2): 1. The biodegradable shape memory material disclosed by the invention not only has a relatively high shape fixation rate and a relatively high shape recovery rate, but also has a relatively high biodegradation rate.

The present invention discloses a furandicarboxylate bio-based crosslinkable elastomer and a preparation method thereof. The preparation method comprises: uniformly mixing furandicarboxylate or furandicarboxylate, a linear saturated dibasic acid or linear saturated dibasic acid ester, a linear unsaturated dibasic acid or linear unsaturated dibasic acid ester, and a diol; adding a catalyst and an antioxidant; heating the mixture to above 150°C; gradually heating the mixture under an inert atmosphere; and reacting the mixture at 150-190°C for 3-7 hours to obtain an intermediate product; stirring the intermediate product for a polycondensation reaction at a vacuum degree of 30-400 Pa and a temperature of 200-260°C for 3-8 hours to obtain a crude product; and dissolving, washing, and drying the crude product to obtain a finished product. The polyfurandicarboxylate bio-based elastomer prepared by the present invention has good mechanical properties and processing properties; and the composite material after crosslinking and filler reinforcement can greatly improve tensile strength, good resilience, low permanent deformation, and high tensile strength.

A hard surface cleaning composition comprising: (a) 0.1 to 60 wt % of a surfactant system; (b) 0.1 to 40 wt % of a solvent, wherein the solvent is selected from the group consisting of a lower alkanol, a benzyl alcohol, a lower alkyl ether, a glycol, an aryl glycol ether, a lower alkyl glycol ether, a glycerol ketal, an ester, a hydrocarbon / ester blend, a dibasic ester, a linear alcohol ethoxylate, a branched alcohol, oxo alcohol ethoxylate, and combinations thereof; and (c) optionally 0.001 to 10 wt % of a lipase.

The application discloses an electronic skin-oriented conductive silver paste and a preparation method and application thereof, and relates to the technical field of flexible printed electronic materials.The raw materials of the electronic skin-oriented conductive silver paste include flaky silver powder, silver nanoparticles, thermoplastic polyurethane elastomer, acrylic elastomer, PEDOT:PSS microgel dispersion, (3-glycidylpropoxy)trimethoxysilane, polydiallyldimethylammonium chloride, hexanedial modified dopamine copolymer, (3-aminopropyl)triethoxysilane, methacryloyloxypropyltrimethoxysilane, cellulose acetate, modified polyurea thixotropic agent, hydrogenated castor oil, ethylene glycol ether acetate, dibasic acid ester, leveling agent and water.The electronic skin-oriented conductive silver paste has the advantages of good electrical performance, good mechanical-electrical stability, good anti-electromigration and sweat corrosion resistance, and can still maintain dendrite-free and low drift under long-term coupling of sweat and bias, and is suitable for electronic skin.

The invention discloses a preparation method of heat-resistant bisphenol A type copolycarbonate, and belongs to the technical field of polycarbonate synthesis. Comprising the following steps: by taking bisphenol A and diester carbonate as monomers, aromatic dibasic acid, aromatic dibasic acid ester or aromatic dihydroxy compound as a copolymerization unit and imidazole ionic liquid as a catalyst, carrying out transesterification under a protective atmosphere, and then carrying out condensation polymerization under a vacuum condition to obtain the heat-resistant bisphenol A type copolycarbonate. A metal-free catalyst is used for carrying out melt polycondensation on bisphenol A type copolycarbonate, so that efficient polymerization and heat-resistant modification of polycarbonate are realized. The performance of the copolycarbonate is regulated and controlled by controlling the type and proportion of the added copolymerization units, so that the glass-transition temperature is increased while the mechanical properties and optical properties of the bisphenol A polycarbonate are retained.

A ceramic scintillator array 1 according to an embodiment of the present invention is provided with a plurality of scintillator segments 2 and a reflective layer. The reflective layer contains a resin composition. The resin composition contains a transparent resin and an additive. Dibasic acid esters serve as the additive.

The present invention relates to the technical field of dibasic ester preparation, and particularly to a dibasic ester esterification preparation device and method. A steam recovery pipe is connected to the kettle top of an esterification kettle. In an initial state, a sealing plate closes a sample outlet. When sampling is required, the sealing plate is rotated toward the inside of a transverse tube portion until one side of the sealing plate faces the steam outlet direction in the transverse tube portion. The slides on the sealing plates on both sides abut against each other to make the slides elastically retracted, driving the arc-shaped end plates to slide out along the arc-shaped end surfaces of the sealing plates. At this time, the arc-shaped end surfaces on one side of the sealing plates and the extended and slid-out arc-shaped end plates are used to guide the steam outlet in the transverse tube portion toward the sample outlet, so that the steam outlet can be efficiently guided to the sample outlet. By detecting the water content of the steam outlet in the sampling tube, the corresponding steam outlet channel is triggered to be connected. Compared with the existing method of uniformly collecting and re-distilling the evaporated hydrated methanol, the segmented collection and corresponding segmented recycling in different ways are more efficient.

The invention belongs to the technical field of electronic paste, and particularly relates to silver-nickel paste for a radio frequency identification antenna and a preparation method of the silver-nickel paste. The silver-nickel paste comprises the following components in percentage by mass: 50-60% of conductive metal powder, 5-20% of polymer resin and a solvent, the conductive metal powder comprises first-stage powder, second-stage powder and third-stage powder, the particle size D50 of the first-stage powder, the particle size D50 of the second-stage powder and the particle size D50 of the third-stage powder are decreased step by step, the first-stage powder is nickel powder, and the second-stage powder and the third-stage powder are silver powder; the conductive metal powder comprises nickel powder and silver powder; the macromolecular resin comprises vinyl chloride-vinyl acetate resin and polyester resin; the solvent is dibasic acid ester. The silver-nickel paste capable of replacing pure silver conductive paste is firstly provided, on one hand, the material cost of the radio frequency identification antenna printing paste is reduced, and on the other hand, the particle size design and metal model selection are combined to optimize the conductive performance after nickel replacement.

The invention discloses high-viscosity low-pour-point wind driven generator gear oil and a preparation method thereof, and relates to the technical field of lubricating oil, a composition of metallocene poly-alpha-olefin and dibasic acid ester is used as base oil, and an anti-wear reagent at extreme pressure, a purification dispersant, an antioxidant, a corrosion inhibitor and an anti-foaming agent are supplemented to prepare the high-viscosity low-pour-point wind driven generator gear oil. The prepared gear oil has excellent viscosity-temperature properties, low-temperature fluidity, oxidation stability, detergency and dispersibility, corrosion resistance, load resistance, foam resistance and the like, can meet the use requirements of wind driven generators, and can also be used as lubricating oil to be applied to other mechanical equipment.

The invention relates to the technical field of foam materials, in particular to an interpenetrating network cross-linked polyvinyl chloride foam material and a preparation method thereof. Comprising the following components in parts by weight: 60-70 parts of polyvinyl chloride resin, 3-7 parts of dibasic acid ester, 30-40 parts of isocyanate, 5-10 parts of a physical foaming agent, 1.5-3 parts of water, 1-3 parts of a nucleating agent, 0.1-0.3 part of a foam stabilizer, 0.5-1 part of a catalyst, 0-10 parts of hollow glass microspheres and 0.5-5 parts of a processing aid, the physical foaming agent is supercritical gas, and the air pressure is 8.5-15 MPa. The one-step mould pressing supercritical foaming process is adopted, the process is simple, the step that a foaming blank is prefabricated firstly and then cross-linked and foamed in a water area or a steam area in conventional mould pressing chemical foaming can be effectively avoided, the foaming time is short, the yield is large, and the production cost is relatively low.

The invention discloses a high-temperature-resistant release film for heat transfer printing and a preparation method of the high-temperature-resistant release film, and relates to the technical field of high polymer materials. When the high-temperature-resistant release film for heat transfer printing is prepared, bipyridyl phenazinone and ethyl chloroacetate react to prepare pyridine cation-based phenazinone dibasic ester; the preparation method comprises the following steps: reacting tetrapod-like zinc oxide whiskers with trimethoxysilylmercaptopropyl silane to prepare sulfydryl modified zinc oxide; reacting the sulfydryl modified zinc oxide with a coumarin derivative to prepare modified zinc oxide; terephthalic acid, ethylene glycol, 1, 6-hexanediol, pyridine cation-based phenazinone dibasic ester, dihydroxy DOPO and modified zinc oxide are subjected to a reaction and polycondensation, and then pelletizing, extrusion and stretching film forming are performed to prepare a modified polyester film; and coating the modified polyester film with the release agent to prepare the high-temperature-resistant release film for heat transfer printing. The high-temperature-resistant release film for heat transfer printing has the advantages of aging resistance, high temperature resistance, flame retardance, static resistance and good tensile strength.

The invention relates to a polyester material, a preparation method thereof and an antibacterial product. The polyester material comprises a polyester main chain and antibacterial peptide; the polyester main chain is prepared from the following raw materials: dibasic acid and / or dibasic ester and dihydric alcohol; the dibasic acid comprises terephthalic acid, and the dibasic ester comprises terephthalic acid ester; the antibacterial peptide is prepared through a ring-opening polymerization reaction of amino-acid ester-N-carboxy anhydride. According to the polyester material, the heat resistance and the optical performance are further improved while good antibacterial performance is achieved.

A device for generating alcohol ketone dibasic acid ester through one-step oxidation of cyclohexane comprises at least one reactor, a first washing tower and a second washing tower, a washing cavity is formed in the top of the reactor, an oxygen source distributor is arranged at the bottom of the reactor, a first feeding port is formed in the bottom of the reactor, an overflow port is formed in the side wall of the reactor, a second feeding port is formed in the washing cavity, and an exhaust port is formed in the top of the washing cavity. A first air inlet is formed in the lower portion of the side wall of the first washing tower, a first washing liquid inlet is formed in the upper portion of the side wall of the first washing tower, a second air inlet is formed in the lower portion of the side wall of the second washing tower, and a second washing liquid inlet is formed in the upper portion of the side wall of the second washing tower. The first washing liquid inlet is connected with a desalted water source and a liquid alkali source, the second gas inlet is connected with the top of the first washing tower through a pipeline, and the second washing liquid inlet is connected with an alcohol ketone source. The device is simple in structure and convenient to maintain, and effectively avoids environmental pollution on the basis of guaranteeing long-time normal and stable operation.

An apparatus for one-step oxidation of cyclohexane to generate alcohol-ketone dicarboxylate esters, comprising at least one reactor, a first washing tower and a second washing tower. A washing chamber is provided at the top of the reactor, and an oxygen source distributor is provided at the bottom. A first feed inlet is provided at the bottom of the reactor, and an overflow port is provided on the side wall. A second feed inlet is provided in the washing chamber, and an exhaust port is provided at the top. A first air inlet is provided at the lower part of the side wall of the first washing tower, and a first washing liquid inlet is provided at the upper part of the side wall. A second air inlet is provided at the lower part of the side wall of the second washing tower, and a second washing liquid inlet is provided at the upper part of the side wall. The first feed inlet and the second feed inlet of the reaction tower are both connected to a cyclohexane source, the exhaust port is connected to the first air inlet, the first washing liquid inlet is connected to a desalinated water source and a liquid caustic source, the second air inlet is connected to the top of the first washing tower through a pipeline, and the second washing liquid inlet is connected to an alcohol-ketone source. The structure of the present invention is simple and convenient for maintenance, and on the basis of ensuring long-term normal and stable operation, environmental pollution can be effectively avoided.

An EPDM composition that is a rubber composition in which ethylene-propylene-diene terpolymer rubber is compounded with carbon black, a plasticizer, and a crosslinking agent, wherein the plasticizer is a polyol ester, which is a reaction product of a neopentyl type polyol and a monocarboxylic acid, and the amount of the plasticizer in the composition is 5 to 22 wt. %. The EPDM composition has excellent effects that kneadability and processability are not impaired, and that in terms of hardness changes after a heat aging test, the resulting crosslinked product is equivalent to when the same amount of an α-olefin oligomer is compounded, and is significantly improved compared to when an aliphatic dibasic acid ester is compounded.

The present invention relates to a method for producing antibacterial polyester, an antibacterial fiber obtained by the method, and the application of the antibacterial fiber in the production of medical and surgical products. The present invention primarily addresses the drawbacks of existing antibacterial polyester fibers, such as poor washability and antibacterial performance. The present invention includes the steps of (i) esterifying a diol with a dibasic acid to obtain ester I, (ii) mixing ester I with a reactive antibacterial component and conducting a pre-polycondensation reaction to obtain a pre-polycondensation product, and (iii) conducting a final polycondensation reaction of the pre-polycondensation product to obtain an antibacterial polyester. The reactive antibacterial component is obtained by esterifying a substance represented by the following formula 3 with a diol. Q is a quaternary ammonium group containing a long-chain hydrocarbon group, the long-chain hydrocarbon group having 6 to 20 carbon atoms, and Ar is an aromatic ring. [Formula 1] JPEG2025538019000015.jpg26170

A separation system for oxidation liquid of cyclohexane catalytic oxidation method, wherein the feed port of a flash tank is connected to an oxidation liquid source, the top outlet feeds the flash tower and an overflow port is provided to feed the separator tank, the bottom outlet of the flash tank feeds the rectification tower, the light phase outlet of the separator tank feeds the extraction washing tower, and the heavy phase outlet feeds the rectification tower, the top of the extraction washing tower is provided with a water source inlet, the bottom outlet feeds the flash tank, and the top outlet feeds the rectification tower, the bottom outlet of the flash tower feeds the flash tank, a small rectification tower is provided at the bottom of the rectification tower, the bottom outlet of the rectification tower feeds the small rectification tower, the bottom outlet of the small rectification tower feeds the decomposition reactor, the decomposition reactor is provided with a catalyst inlet, and the decomposition reactor discharges alcohol ketone dibasic acid esters. The present invention can effectively avoid system blockage and ensure long-term normal operation of the system on the basis of separating the oxidation liquid prepared by cyclohexane catalytic oxidation method with low energy consumption and high yield.

An EPDM composition, which is a rubber composition prepared by compounding carbon black, a plasticizer and a crosslinking agent in ethylene-propylene-diene terpolymer rubber. Among them, the plasticizer is a polyol ester, which is a reaction product of a neopentyl-type polyol and a monocarboxylic acid, and the amount of the plasticizer in the composition is 5% to 22% by weight. This EPDM composition does not impair the kneadability and processability, and the hardness change of the obtained crosslinked product after the heat aging test is at the same level as that in the case of compounding the same number of parts of α-olefin oligomer, and is greatly improved compared with the case of compounding an aliphatic dibasic acid ester.

The invention provides a moisture absorption and sweat releasing antistatic finishing agent and a preparation method thereof. The antistatic finishing agent is prepared from the following raw materials: 80 to 100 parts of dibasic acid ester, 80 to 100 parts of dihydric alcohol, 24 to 30 parts of lactam monomer, 40 to 50 parts of polyethylene glycol, 0.5 to 1 part of catalyst, 8 to 15 parts of polyether-siloxane-ionic liquid terpolymer, 3 to 6 parts of graphene-zinc oxide-sodium bentonite composite powder, 3 to 8 parts of functional filler, 1 to 3 parts of dispersing aid, 0.1 to 0.3 part of defoaming agent, 0.2 to 0.5 part of antioxidant and 2 to 5 parts of coalescing agent. The moisture-absorbing and sweat-releasing antistatic finishing agent can endow the fabric with excellent moisture-absorbing and sweat-releasing properties, lasting antistatic property and washability, has an antibacterial effect, can improve the hand feeling and air permeability of the fabric, and is good in self stability.

The invention discloses a nano passivation coating for the surface of a FW500 galvanized sheet. The coating is prepared by coating a nano passivation coating on the surface of the FW500 galvanized sheet and then drying the coating. The nano passivation coating is mainly prepared from a water-based polyester resin, a water-based amino resin, an aliphatic dibasic acid ester, a nano filler, a colored pigment, a silane coupling agent, a processing aid and water. The nano filler is mixed with a nano graphene powder and a nano silicon dioxide powder in a mass ratio of 1:(4-5), and the nano filler accounts for 3-8wt.% of the total mass of the coating. The graphene powder used in the coating for the nano passivation coating in the invention has a layered structure and can be laid flat on the surface of a material; the nano silicon dioxide powder used has a spherical structure and can be filled in the gaps between the graphene lamellar structures, so that the lamellar structure and the spherical structure fill the surface of the protected material, and the corrosion resistance of the galvanized sheet can be enhanced.

The invention belongs to the technical field of polyester copolymerization modification, and relates to a preparation method of block polyester-polycarbonate, which comprises the following steps: by taking dimethyl carbonate and dihydric alcohol as raw materials, and dihydric alcohol and dibasic acid dimethyl ester or dibasic acid as raw materials, sequentially performing esterification and pre-polycondensation reaction under the action of a catalyst, thereby obtaining the block polyester-polycarbonate. The preparation method comprises the following steps: respectively obtaining a carbonic acid ester with a methoxy end group and a dibasic acid ester with a hydroxyl end group, mixing the carbonic acid ester with the methoxy end group and the dibasic acid ester with the hydroxyl end group, and carrying out final polycondensation reaction under a negative pressure condition to prepare block polyester-polycarbonate; the number-average molecular weight of the carbonate ester with the end group being methoxyl is 430-4000 g / mol; and the difference between the number-average molecular weight of the carbonate chain segment in the block polyester-polycarbonate and the number-average molecular weight of the carbonate ester with the end group being methoxyl is less than 5%. The preparation method is simple and easy to implement, and the obtained block polyester-polycarbonate is excellent in thermal performance and mechanical performance.

The application discloses an environmentally-friendly low-odor stretchable conductive silver paste and a preparation method and application thereof, and relates to the technical field of flexible printed electronic materials.The raw materials of the environmentally-friendly low-odor stretchable conductive silver paste include flaky silver powder, silver nanoparticles, a bio-based polyurethane, an acrylic elastomer, PEDOT:PSS microgel, a sulfobetaine-silane copolymer, polyquaternium-10, 1,2,4-triazole or a derivative thereof, cellulose ester, fumed silica, ethylene glycol ethyl ether acetate, dibasic acid ester, a leveling agent and water.The environmentally-friendly low-odor stretchable conductive silver paste has the advantages of low VOC emission, low odor, good skin compatibility and good chemical stability, and can still maintain dendrite-free and low drift under long-term coupling of sweat and bias voltage;the paste can be densified at a low resistance at 130 DEG C for 30 min, is friendly to printing and is suitable for roll-to-roll large-area manufacturing.

The invention discloses a modified montmorillonite-based lubricant and a preparation method thereof, and belongs to the technical field of lubricants, oleic acid and diethylenetriamine are cyclized and quaternized to prepare an oleic acid-based imidazoline quaternary ammonium salt corrosion inhibitor, the oleic acid-based imidazoline quaternary ammonium salt corrosion inhibitor is used for organic modification of nano montmorillonite, a silane coupling agent is further adopted for silanization treatment, and the modified montmorillonite-based lubricant is prepared. The preparation method comprises the following steps: preparing silane modified corrosion-inhibition montmorillonite, carrying out in-situ polymerization coating by taking a urea-formaldehyde prepolymer as a wall material to form montmorillonite modified corrosion-inhibition microcapsules, and carrying out copolymerization on acrylic acid, N, N-bis (2-hydroxyethyl) aminomethylene diethyl phosphonate and trifluoromethacrylate to obtain the modified polyacrylate dispersant with heat-resistant and dispersion-stable functions. The microcapsule, a dispersing agent, dibasic acid ester oil, PAO base oil and an antioxidant are compounded in proportion to form the modified montmorillonite-based lubricant.

The invention discloses conductive silver paste for electronic skin as well as a preparation method and application of the conductive silver paste, and relates to the technical field of flexible printing electronic materials. The conductive silver paste for the electronic skin comprises the following raw materials: flake silver powder, silver nanoparticles, a thermoplastic polyurethane elastomer, an acrylic elastomer, a PEDOT: PSS microgel dispersion, (3-glycidyl propoxy) trimethoxysilane, poly (diallyldimethylammonium chloride), an adipic dialdehyde modified dopamine copolymer, (3-aminopropyl) triethoxysilane, a crosslinking agent, a coupling agent and a solvent. The coating is prepared from methyl acryloyloxy propyl trimethoxy silane, cellulose acetate, a modified polyurea thixotropic agent, hydrogenated castor oil, ethylene glycol monoethyl ether acetate, dibasic acid ester, a flatting agent and water. The conductive silver paste for the electronic skin has the advantages of being good in electrical property, mechanical-electrical stability, electromigration resistance and sweat corrosion resistance, can still keep no dendrite and low drift under long-term coupling of sweat and bias voltage, and is suitable for the electronic skin.

The present application belongs to the technical field of polyester copolymerization modification, and relates to a preparation method of block polyester-polycarbonate. Dimethyl carbonate and dihydric alcohol are used as raw materials, and dihydric alcohol and dimethyl dicarboxylate or dicarboxylic acid are used as raw materials. Under the action of a catalyst, esterification and pre-polycondensation reactions are sequentially performed to obtain carbonate esterification products with methoxy end groups and dicarboxylic acid esterification products with hydroxyl end groups, respectively. The carbonate esterification products with methoxy end groups and the hydroxyl-terminated dicarboxylic acid esterification products are mixed and subjected to final polycondensation reaction under negative pressure to obtain block polyester-polycarbonate. The number average molecular weight of the carbonate esterification products with methoxy end groups is 430-4000 g / mol. The number average molecular weight of the carbonate segment in the block polyester-polycarbonate and the number average molecular weight of the carbonate esterification products with methoxy end groups differ by less than 5%. The preparation method is simple and easy to implement, and the obtained block polyester-polycarbonate has excellent thermal and mechanical properties.

The primer composition comprises a polyacrylate dissolved or dispersed in water. The polyacrylate comprises at least 20% by weight of methyl methacrylate units, at least 15% by weight of monomer units comprising at least one of secondary amines, tertiary amines, or tertiary amides, at least 15% by weight of acrylic monomer units comprising an alkyl group having at least four carbon atoms, and 2.5% to 10% by weight of acrylic monomer units comprising a carboxylic acid group. The primer composition comprises a polymer dispersed in water and a solvent, wherein water accounts for 50% by weight or more of the primer composition, and the solvent comprises at least one of propylene carbonate, polyol, polyol ether, polyol ether ester, or dibasic acid ester. The adhesive system comprises the primer composition and an adhesive tape. Furthermore, a method for producing the bonded article is also described.