250 results about "Low temperature curing" patented technology

The invention discloses a low-temperature curing photoresist applied to a flexible display panel and a preparation method of the low-temperature curing photoresist, and belongs to the technical field of energy conservation and environmental protection. The photoresist is prepared by compounding a reactive organic-inorganic mixed nano filler, a photosensitive resin matrix, a benzocyclobutenyl silicone oligomer (BSA resin) and an additive. The preparation method comprises the following steps: preparation and surface modification of the nanofiller; synthesizing a photosensitive resin matrix; compounding the oligomer with an additive; dispersing the slurry and adding a nano corrugated template; spin coating, ultraviolet pre-curing, low-temperature baking and heat post-curing are carried out. The curing temperature of the photoresist is lower than 120 DEG C, the resolution ratio is superior to 3 microns, and the bending tolerance frequency is gt; the adhesion strength is gt after 20000 times; 15 Kgf / cm < 2 >, and the water vapor permeability is lt; 10 <-6 >, heat resistance gt; the temperature is 150 DEG C, and the dielectric constant is lt; 3.5, VOC (Volatile Organic Compounds) emission lt; the organic light-emitting material has excellent flexibility, thermal stability and environmental protection performance, is suitable for a pixel definition layer of an OLED flexible display panel, and improves the light extraction efficiency and the anti-fatigue performance.

The invention discloses low-temperature anti-oxidation conductive copper paste, a preparation method and an RFID tag, and relates to the field of conductive paste. The modified copper powder comprises: copper powder; the cysteamine self-assembly molecular layer is formed by coupling sulfydryl of cysteamine with the surface of the copper powder; the metal phthalocyanine complex molecular layer is coordinated with central metal ions of metal phthalocyanine molecules through amino groups of cysteamine and is connected to the surface of the cysteamine self-assembled molecular layer; and the conductive copper paste is sintered at 140-170 DEG C. According to the low-temperature curing conductive copper paste, the problem of anti-oxidation defects of the copper powder can be effectively solved while the conductivity of the copper powder is ensured, and the low-temperature curing conductive copper paste with long-acting anti-oxidation performance and high conductivity is obtained.

The invention belongs to the field of polyester resins, and provides a weather-resistant polyester resin for low-temperature curing and a preparation method thereof. A three-step progressive design that a polyester prepolymer is terminated by silane and then is subjected to hydrolytic polycondensation with tetraethyl orthosilicate to construct an organic-inorganic covalent hybrid network is adopted; through cooperation of the condensation catalyst, the hindered amine light stabilizer and the ultraviolet absorbent, the mechanical properties that the pencil hardness reaches the HB level or above and the cross-cut test level is not higher than the first level under the low-temperature curing condition of not higher than 100 DEG C are achieved, and the long-term weather resistance that the color difference is not larger than 2.0 and the gloss retention rate is not lower than 80% after 500-hour artificial accelerated aging is achieved. The technical problems of poor storage stability and difficulty in consideration of high solid content and low viscosity caused by insufficient low-temperature curing capacity and non-uniform organic-inorganic hybridization of the traditional polyester resin are solved, and the polyester resin has wide application value in the fields of building coatings, automobile refinishing paints, wood coatings and the like with strict requirements on low-temperature curing and weather resistance.

The invention provides a bio-based low-temperature curing powder coating and a preparation method thereof, and belongs to the technical field of powder coatings, and the bio-based low-temperature curing powder coating specifically comprises the following components in parts by weight: 65-75 parts of bio-based resin, 5-6 parts of triglycidyl isocyanurate, 0.05-0.15 part of tetrabutylammonium bromide, 8-12 parts of air glass beads, 4-6 parts of mica and 0.4-0.6 part of ethylene bis stearamide. 0.7 to 1.3 parts of flatting agent, 0.2 to 0.5 part of benzoin, 0.3 to 0.7 part of amide wax and 6 to 8 parts of pigment. The curing temperature of the bio-based low-temperature curing powder coating is 100-120 DEG C, and the bio-based low-temperature curing powder coating has the advantage of low curing temperature, can be suitable for surface coating of plastic devices, has the advantages of salt mist resistance, impact resistance and the like, and can effectively solve the problems of existing powder coatings.

The invention provides epoxy resin for halogen-free flame-retardant self-leveling powder coating and a preparation method of the epoxy resin, and belongs to the technical field of powder coating. The flame retardant is mainly prepared from anhydrous piperazine, bisphenol A diglycidyl ether, trihydroxymethyl phosphorus oxide, triethyl phosphite, epoxy chloropropane, sodium hydroxide, N-methyl iminodiacetic acid, ethylene glycol diglycidyl ether and other main raw materials through polymerization. The prepared epoxy resin and 2-phenylimidazoline are subjected to low-temperature curing (135 DEG C / 20 min) on the premise that an additional flatting agent does not need to be used, the flexibility of a coating film is good, the impact resistance grade is high, the impact performance reaches the condition that no cracking phenomenon exists in the front and back 60cm, the leveling grade reaches the grade 7 or above, the gloss is high and reaches 95% or above, the oxygen index reaches 34% or above, and the halogen-free flame retardant performance is excellent.

The invention relates to the technical field of adhesives, and particularly discloses an adhesive for repairing a glass fiber reinforced plastic pipeline and a preparation process. The invention relates to an adhesive for repairing a glass fiber reinforced plastic pipeline. The adhesive is prepared from the following raw materials: modified bisphenol A epoxy resin, a curing agent, a glass fiber reinforced filler, a silane coupling agent, phenyl glycidyl ether, hydroxyl-terminated nitrile rubber and an antioxidant 1076, the modified bisphenol A type epoxy resin is prepared by grafting and modifying bisphenol A type epoxy resin through amino-terminated polyether; the glass fiber reinforced filler is prepared from hydroxylated glass fibers and a graphene-carbon nanotube compound through covalent grafting. The adhesive can be used for emergency repair of glass fiber reinforced plastic pipelines, has the advantages of high low-temperature curing speed, high bonding strength and good durability, can effectively avoid cracking and leakage of repaired parts, and is adaptive to low-temperature and high-pressure complex repair working conditions. The preparation process is simple and convenient to operate and high in controllability, the adhesive with uniform performance can be stably prepared, and the repair efficiency and repair quality are guaranteed.

According to the anodic oxidation technology suitable for the 6061 aluminum alloy, multi-component silica sol is adopted for conducting room-temperature dipping hole sealing and low-temperature curing on a 6061 aluminum alloy anodic oxidation film, and technology energy consumption and equipment requirements are reduced. The dense silicon network seals the membrane holes, prolongs the diffusion path of a corrosive medium and prevents the corrosive medium from invading the substrate, thereby greatly improving the corrosion resistance of the membrane layer and inhibiting pitting corrosion.

The invention relates to the technical field of carbon nanomaterials, and discloses a water-based high-dispersion carbon nanotube-graphene composite conductive liquid and a low-temperature curing process thereof, the process comprises pre-dispersion, fine dispersion, conductive liquid preparation, curing treatment, low-temperature curing and post-treatment, and by optimizing the composite dispersion process and a surface modification method, the conductive liquid is prepared. The agglomeration phenomenon of nano materials is inhibited, uniform and stable dispersion of the carbon nanotubes and graphene in a high-water-based medium is realized, and the storage stability and applicability of the conductive liquid are improved; by designing a multi-stage low-temperature cross-linking mechanism, the curing temperature is reduced, the process time is shortened, and damage of high temperature to a heat-sensitive base material is avoided; through the synergistic effect of the graphene and the carbon nanotubes and the application of an interface enhancement technology, a continuous and stable three-dimensional conductive path is formed in a low-temperature film forming process, and the conductivity, the mechanical strength and the environmental stability of the conductive film are improved.

The application discloses a kind of low-temperature curing paste of enhanced temperature cycle resistance and preparation method thereof, it is related to chip packaging field, low-temperature curing paste includes by mass percentage: 1-20% thermoplastic resin particles, 0.1-5.0% thermosetting resin, 0.1-1.5% solvent and remaining silver powder;Silver powder includes by mass percentage: 10-45% spherical nanometer silver particles a, 1-5% spherical nanometer silver particles b and remaining micron silver flake;The particle size of micron silver flake is 1-10 μm, the particle size of spherical nanometer silver particles a is 50-100 nm, the particle size of spherical nanometer silver particles b is 5-50 nm, the particle size of thermoplastic resin particles is 1-15 μm.The paste of component allocation of the present application by thermoplastic resin particles and silver powder etc., when joint structure formed by paste solidification experiences temperature cycle, thermoplastic resin particles can melt at high temperature and dynamically fill the pore between silver powder particles, to hinder the migration path of silver atom, inhibit the metal grain growth caused by temperature fluctuation, reduce the internal stress generated by grain coarsening.

The application discloses a high-tapped-density flaky silver powder for high-solid-content low-temperature curing silver paste and a preparation method thereof, and can be used in the preparation of low-temperature high-thermal-conductivity LED conductive silver paste, high-solid-content low-temperature HJT silver paste and other low-temperature silver pastes requiring high solid content, and can replace the use of other foreign silver powders. The high-tapped-density flaky silver powder for high-solid-content low-temperature curing silver paste has concentrated flaky powder particle size distribution, and the tapped density reaches 5.5 or above, so that the market demand is met, and the blank of the high-tapped-density flaky silver powder required by the high-solid-content low-temperature curing silver paste in China is filled.

The application discloses a novel flexible printed circuit board and camera module prepared based on weldable low-temperature silver paste, and belongs to the technical field of electronic materials and devices. The conductor pattern in the flexible printed circuit board comprises a main circuit pattern and an auxiliary function structure formed by weldable low-temperature cured silver paste. The curing temperature of the weldable low-temperature silver paste is 87-103 DEG C. The silver paste comprises conductive fillers, a polymer resin system, ester solvents, a curing agent, a silane coupling agent, polyamide wax thixotropic agents, polysiloxane defoaming agents, modified carbon nanotubes, modified antimony tin oxide powder, modified ceramic fillers and low-stress modifiers. The polymer resin system comprises hydrogenated bisphenol A type epoxy resin, diphenyl type epoxy resin and polyacrylate-CTBN copolymer. The conductive fillers comprise silver-coated copper flaky powder, nano silver wire and low-temperature alloy powder. Through the synergistic effect of components and the innovative process, the comprehensive improvement of mechanical properties, conductive properties, high-frequency characteristics and welding reliability is realized under the premise of ultralow-temperature curing.

The present application relates to the low temperature curing high-strength benzoxazine type silicone adhesive formula and use method, the formula includes the benzoxazine group containing organic silicon compound and organic alkali compound, the mass ratio of benzoxazine group containing organic silicon compound, organic alkali compound is 100:0.1-20.The adhesive of the present application is based on the cooperation between the benzoxazine group containing organic silicon compound and the basic catalyst, can be cured at low temperature, realize the higher strength bonding.The benzoxazine type silicone adhesive formula provided by the present application can be directly used as adhesive, and the bonding strength is high;It can also be used as a basic formula, used as an adhesive after adding other fillers, to meet the different needs of various special occasions.

The invention discloses a high-performance modified epoxy adhesive and a preparation method thereof, and belongs to the technical field of epoxy adhesives, and the preparation method comprises the following steps: preparing a hydrolyzed silane solution, silane modified silicon dioxide, carboxylated silicon dioxide and modified nano silicon dioxide, and premixing and curing to obtain the high-performance modified epoxy adhesive. According to the method, curing process parameters are optimized, a mild segmented low-temperature curing system is constructed, the damage risk of traditional high-temperature curing on the thermosensitive base material is technically avoided, the bonding requirements of different thermosensitive base materials can be met without additionally adding a base material protection or pretreatment step, and the technical suitability is higher.

The present application relates to the technical field of biomedical materials, and discloses a biological activity and biocompatibility surface treatment method for dentures and implants, which comprises the following steps: a) performing surface pretreatment on the base body of the denture or implant; b) applying a composite coating containing hydroxyapatite particles and biocompatible resin adhesive on the surface of the pretreated base body; c) performing low-temperature thermal curing on the composite coating to form a composite coating layer; and d) performing precision polishing on the surface of the cured composite coating layer to selectively remove part of the resin adhesive on the surface. Through mechanical locking of the base body surface and chemical combination of the interface inside the coating, a composite coating layer which is firmly combined with the base body and chemically stable is obtained; meanwhile, through low-temperature curing and surface activation treatment, the hydroxyapatite is exposed on the surface of the coating layer while the biological activity of the hydroxyapatite is retained, so that the coating layer is endowed with effective biological functions.

The invention belongs to the technical field of embedded steel bar adhesives, and particularly relates to a low-temperature quick-drying embedded steel bar adhesive which comprises a material A and a material B. The material A comprises the following components in parts by weight: 18-22 parts of epoxy resin, 4.8-5.3 parts of a diluent, 0.5-0.6 part of first white carbon black and 18-22 parts of first silica powder; and the material B comprises the following components in parts by weight: 10-12 parts of a curing agent, 0.1 part of a coupling agent, 0.5-0.8 part of second white carbon black, 6.5-11.5 parts of second silica powder and 0.03-0.06 part of color paste. The overall structure provided by the embodiment of the invention has certain thixotropy and does not flow during construction; good bonding performance with most structural materials is achieved; the adhesive is free of crystallization and low-temperature curing, can well meet various requirements specified in the national standard, meets the construction requirement at the low temperature of-10 DEG C, can be stressed for 2 hours at the normal temperature of 23 DEG C, is high in corrosion resistance, does not flow during construction, and has high adhesive property.

A method for producing a laminate that is obtained by bonding an adherend with a cured product having a high elastic modulus in a high-temperature environment even in a case where low-temperature curing is carried out, is provided. The method for producing a laminate includes the steps of applying a curable resin composition having a specific composition to a first adherend and bonding the first adherend with a second adherend, and subjecting the curable resin composition to low-temperature curing. The laminate has a ratio of a thickness of the cured product and an average thickness of those adherends in a specific range.

The invention belongs to the technical field of thermal spraying coating hole sealing, and discloses a hole sealing method based on the porosity of a thermal spraying coating, which comprises the following steps: forming a coating on the surface of a base material through a thermal spraying process, applying hole sealing glue on the surface of the coating, and forming a hole by utilizing the structural characteristic that open pores are communicated with one another. Enabling the hole sealing glue to naturally permeate into the coating under the action of gravity, enabling the hole sealing glue to at least permeate into the coating by 500 microns before curing by controlling the surface tension, viscosity and curing conditions of the hole sealing glue, and continuously filling holes; and then the coating is subjected to low-temperature curing treatment, so that the hole sealing glue forms a stable hole sealing structure in the holes. After the method disclosed by the invention is adopted, no less than 95% of open pores in the coating can be effectively sealed under the condition of not applying external pressure or vacuum assistance, so that the voltage resistance of the thermal spraying coating is stabilized at 500V or above, and the resistance value is improved from megohm level to gigaohm level, thereby obviously improving the electrical property and corrosion resistance of the coating.

According to the manufacturing method of the ceramic matrix composite turbine blade, a blade inner core prefabricated part comprising a front edge sub-part, a middle sub-part and a tail edge sub-part is manufactured, the front edge sub-part and the tail edge sub-part are manufactured by pressing one-way belt molds arranged in the blade height direction, and the sectional areas of the front edge sub-part and the tail edge sub-part are kept unchanged at the positions of different blade heights; the middle sub-component is formed by mould pressing of a plurality of layers of ceramic fiber spread materials which are spread at different angles; laying a plurality of layers of ceramic fiber spreading materials on the peripheral side of the blade inner core prefabricated part to a preset external size, and carrying out mold pressing and low-temperature curing to obtain a blade prefabricated part; and the blade prefabricated part and the margin plate prefabricated part are spliced to obtain a turbine blade prefabricated part, and then high-temperature carbonization and molten silicon permeation densification treatment are conducted to obtain the finished ceramic matrix composite turbine blade. The method is simple in process and good in formability, and the forming quality and the production efficiency of the turbine blade can be improved. The invention further provides the ceramic matrix composite material turbine blade.

The utility model relates to powder coating curing baking technical field, and disclose a kind of segmented low-temperature curing baking equipment of powder coating, including workbench.The segmented low-temperature curing baking equipment of powder coating, first the placing box is moved to drying chamber entrance, and start central hydraulic rod so that central hydraulic rod end of the partition in closed state, at this time, cooperate surface-mounted thermometer to carry out real-time detection to drying chamber internal temperature, then start the temperature controller of surface, utilize temperature controller control heating net installed in drying chamber inner wall two sides and carry out heating, main effect is to slowly heat workpiece to certain temperature, make powder coating preliminary softening, prepare for subsequent crosslinking reaction, in this way, control suitable temperature in drying chamber middle part and complete crosslinking reaction, complete curing stage at drying chamber export, to reach the temperature of precision control each stage powder coating curing baking, improve product quality.

This invention belongs to the field of microwave absorbing materials technology, and discloses a SiBCN-ZrO2 ceramic composite material with high temperature resistance, oxidation resistance, and full X-band absorption, as well as its preparation method. First, SiBCN and ZrO2 polymer liquid-phase precursors are uniformly mixed, followed by low-temperature curing and high-temperature pyrolysis heat treatment, ultimately obtaining a SiBCN-ZrO2 ceramic composite material with ZrO2 uniformly distributed in an amorphous SiBCN matrix. This ceramic composite material has an effective absorption bandwidth of 4.2 GHz in the X-band, compared to 3.65 GHz for pure PDC-SiBCN ceramic, demonstrating an improved effective absorption bandwidth that covers the entire X-band, and also improving oxidation resistance. The preparation process of the SiBCN-ZrO2 ceramic composite material prepared by this invention is simple and can effectively improve the insufficient dielectric loss capacity of PDC-SiBCN ceramic as a microwave absorbing material, enhancing the overall high-temperature resistance and oxidation resistance of the material.

The application relates to a high-temperature-resistant high-entropy ceramic battery shell and a preparation method thereof. The battery shell comprises a battery shell base material and a high-entropy oxide ceramic coating attached to the surface. The coating comprises an organic-inorganic hybrid cross-linked network and a nano ceramic powder; the powder has a single cubic phase fluorite structure, and a general chemical formula is AB2O4, wherein a rare earth element is a positive trivalent element not containing cerium. The powder particle size distribution satisfies D50 / D90 < 2.5, and a coating and a base material interface form a covalent bond. During preparation, a nano slurry is obtained through high-temperature calcination and sand milling, a bonding system is constructed by combining a silane coupling agent and an inorganic sol, and a high-adhesion coating is generated in situ through coating and low-temperature curing. The application solves the thermal mismatch combination problem of high-entropy ceramics and a metal base material, and significantly improves the limit thermal protection performance of the battery shell under a transient working condition of more than 1600 DEG C.

The invention provides a low-temperature curing agent material of quartz sand for fuses and a curing process, and relates to the technical field of fuses, the low-temperature curing agent material comprises a functional phase, a hardening agent and a coating phase, the functional phase is a water glass solution prepared by taking at least one of alkali metal silicate as a main component, and the addition amount of the functional phase accounts for 75-92 wt% of the material; the hardening agent is at least one of organic esters; the compactness, compressive strength, toughness and the like of the cured quartz sand filler are improved through different curing agent system designs, different hardening mechanisms, enhancement modes, hydrophilic improvement and other modes, on one hand, expansion of an electric arc channel when a metal melt is broken under high voltage and large current can be reduced, and the post-arc time and electric arc energy are reduced; on the other hand, the erosion effect of moisture and other substances in the environment on the quartz sand filler in the long-term use process of the product can be reduced, and the long-term use reliability of the fuse product is improved.

The application discloses an environmentally-friendly water-based low-temperature curing type adhesive for use in an electric core and belongs to the technical field of lithium battery materials.The environmentally-friendly water-based low-temperature curing type adhesive for use in an electric core comprises, in mass fractions, 10-30 parts of polyacrylic acid emulsion, 40-70 parts of acrylate grafted styrene-butadiene rubber, 5-20 parts of nano filler, 2-8 parts of water-based curing agent and 100-200 parts of deionized water, wherein the solid content of the polyacrylic acid emulsion is 20-30%, the grafting rate of the acrylate grafted styrene-butadiene rubber is 8-15 DEG C, and the nano filler is ultrasonically dispersed by using a dispersant.The adhesive provided by the application has the properties of environmental protection, high adhesion, volume expansion inhibition capacity for a silicon-based negative electrode, can meet the requirements of the heat resistance and low moisture of a diaphragm, realizes the adaptive application of the diaphragm and the positive and negative electrodes of the electric core, and improves the comprehensive performance and environmental protection of the lithium battery.

The utility model discloses a low-temperature quick drying device for spraying primer on a petroleum drill rod, which comprises a drying rack, a drill rod inlet is arranged on one side of the drying rack, a drilling machine outlet corresponding to the drilling machine inlet is arranged on the other side of the drying rack, and a hot air drying structure is arranged on the drying rack. The utility model relates to the technical field of drill rod paint spraying, in particular to a low-temperature quick drying device for spraying primer on a petroleum drill rod, which recovers waste heat of waste gas through a plate heat exchanger to preheat fresh air and is matched with matrix air supply holes at the bottom to form a uniform hot air curtain, so that quick low-temperature curing of the primer is realized; energy consumption is comprehensively reduced while drying efficiency is guaranteed, and the problem of contradiction between rate and energy consumption of a traditional low-temperature process is thoroughly solved.

The invention belongs to the technical field of polyurethane elastomers and application thereof, and particularly relates to acrylic modified TPU (thermoplastic polyurethane) resin, a preparation method thereof and application of the acrylic modified TPU resin in low-temperature curing ink. The acrylic modified TPU resin is prepared from the following raw materials: polyol, hydroxyl and carboxyl acrylic resin, diisocyanate, a chain extender and a catalyst. The acrylic modified TPU resin is used for preparing the low-temperature curing ink, and the method mainly comprises the following steps: dissolving the acrylic modified TPU resin in a solvent, sequentially adding aliphatic blocked polyisocyanate, an oxazoline polymer and the like, stirring and curing to obtain the low-temperature curing ink; the aliphatic blocked polyisocyanate is an HDI (Hexamethylene Diisocyanate) tripolymer. According to the TPU resin chemically modified by the acrylic resin and the preparation method of the TPU resin, the compatibility of the TPU resin and the acrylic resin is remarkably improved, and the TPU resin has low-temperature curing performance, adhesive force, flexibility and tolerance and is suitable for the field of high-performance low-temperature curing ink.

The invention relates to the technical field of refractory materials, in particular to a refractory precast block for a tunnel kiln car table top and a preparation method of the refractory precast block, and aims at achieving synergistic improvement of alkali corrosion resistance and thermal shock resistance under the working condition of coupling of alkali-rich steam and frequent thermal shock. According to the formula, white molten aluminum oxide, molten magnesium aluminate spinel, alpha-aluminum oxide, plate-shaped aluminum oxide, calcined kaolin and the like are used as aggregates and matrixes, zirconium phosphate grafted with double-molecular-weight methoxy polyethylene glycol silane is introduced to serve as a grading template and an interface coupling unit, and a low-temperature curing-medium-temperature calcining-permeating-high-temperature sintering technology is adopted, so that the high-performance magnesium aluminate spinel ceramic is prepared. A calcium hexaluminate / mullite / magnesium aluminate spinel / aluminum phosphate four-phase interpenetrating network and controlled composite pore structure is constructed in the material. The refractory precast block has high volume density and low vacuum porosity, the refractoriness reaches about 1790 DEG C, the strength retention rate is excellent after 10 times of alkali steam-thermal shock cycles, the size and quality changes are controlled, and the service life of a kiln car table top is remarkably prolonged.

The invention provides a blocked polyisocyanate composition as well as a preparation method and application thereof. The present invention relates to a blocked polyisocyanate containing a polyisocyanate and a blocking agent containing compounds represented by general formula (I) and general formula (II), and the molar ratio of the total structure obtained by bonding the sealant represented by general formula (I) and the isocyanate group to the total structure obtained by bonding the sealant represented by general formula (II) and the isocyanate group is 75 / 25 to 90 / 10 (inclusive). The composition has good low-temperature curing performance, and the storage stability of the composition is improved.

Disclosed in the present application are a photosensitive polyimide composition, a manufacturing method for patterns, a structure, a component, and a device. The composition is made of the following raw materials in parts by weight: 100 parts of a block polymer which can be dissolved in an alkaline aqueous solution; 5-30 parts of a thermal crosslinking agent which is selected from a crosslinking agent containing an epoxy group and a crosslinking agent containing -CH2OR; 0.5-5 parts of a photoacid generator; and 0.5-10 parts of a silane coupling agent. The photosensitive polyimide composition provided in the present application has excellent alkali solubility, can duplicate fine patterns, has low warping stress after low-temperature curing, and has high chemical stability and cohesiveness.

The application discloses a low-temperature conductive paste and application thereof. The low-temperature conductive paste comprises silver-coated copper powder 68-88%, spherical silver powder 2-20%, organic binder 2-5%, auxiliary agent 0.5-2.5% and solvent 2-6%, and the total silver content is 6-33%; the silver-coated copper powder comprises a copper core and a silver layer coated on the outer surface of the copper core, and the ratio of the grain size of the copper core to the average particle size D50 is 0.015-0.4. The copper core grain boundary of the silver-coated copper powder is moderate, the silver layer is continuous and dense, and the silver-coated copper powder has good sintering activity and conductivity during low-temperature solidification. The low-temperature conductive paste is printed on a heterojunction cell sheet, and conductive grid lines are formed through low-temperature solidification, so that the photoelectric conversion efficiency is 0.03-0.1% higher than that of traditional silver-coated copper paste, long-term reliability is excellent, and the low-temperature conductive paste is suitable for low-silver-content photovoltaic conductive paste.

The invention discloses a microcapsule latent curing accelerator, a preparation method of the microcapsule latent curing accelerator, a TGIC cured polyester powder coating and a preparation method of the TGIC cured polyester powder coating. The microcapsule latent curing accelerator comprises a capsule core and a capsule wall, wherein the capsule core accounts for 50-85% of the total mass of microcapsules, and the capsule wall accounts for 15-50% of the total mass of the microcapsules; the capsule core is at least one curing accelerator selected from imidazole compounds, imidazolium salts, quaternary ammonium salts, organic phosphine or quaternary phosphonium salts; the capsule wall is a cross-linked polymer shell formed by in-situ polymerization of an amino resin prepolymer; and the particle size D50 of the microcapsule is 1-20 microns. The accelerant has the beneficial effects that the storage stability (40 DEG C accelerated storage) of a coating using the accelerant should exceed 60 days while the coating keeps excellent low-temperature curing capacity at 130-160 DEG C, and a final coating film has appearance and comprehensive performance equivalent to those of a traditional high-temperature curing coating.