CN105788701A - Conductive silver paste for fine line laser etching for capacitive type touch screen - Google Patents
Conductive silver paste for fine line laser etching for capacitive type touch screen Download PDFInfo
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Abstract
The invention relates to conductive silver paste for fine line laser etching for a capacitive type touch screen. The conductive silver paste comprises the following components in parts by weight: 65-80 parts of metal silver powder, 5-10 parts of organic carrier, 3-23 parts of organic solvent, 0.1-1 parts of defoaming agent, 0.1-1 parts of leveling agent, 0.1-1 parts of anti-skinning agent, 0-1 parts of thixotropic agent and 0-1 parts of pigment; the preparation method for the conductive silver paste comprises the steps of mixing the organic carrier and the organic solvent to prepare a uniform colloidal solution; then adding the other components in sequence; and enabling the mixture to be mixed through a mixer, grinded through a three-roll mill, filtered, and the like to obtain the conductive silver paste for fine line laser etching for the capacitive type touch screen. Compared with the prior art, the conductive silver paste is simple in preparation process; the prepared conductive silver paste is low in resistance, high in adhesive force, high in surface hardness, corrosion resistance, and oxidization resistance, wherein the adhesive force between the conductive silver paste and a PET substrate can reach 5B level, and the surface hardness can reach greater than 3H; and therefore, the fine lines on the capacitive type touch screen can be manufactured by a laser etching process.
Description
Technical field
The invention belongs to conductive material technical field, relate to a kind of conductive silver paste, especially relate to a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste and preparation method thereof.
Background technology
Capacitance-type touch screen technology is that the electric current sensing utilizing human body is operated.It is one piece of four layers of compound glass screen, and the inner surface of glass screen and interlayer respectively scribble one layer of tin-doped indium oxide (English abbreviation ITO), and outermost layer is a thin layer silicon soil glassivation.Interlayer ITO coating, as work surface, four angles is drawn four electrodes, and internal layer ITO is that screen layer is to ensure good working environment.When finger touches on the metal layer, owing to human body electric field, user and touch screen surface form a coupling electric capacity, for high frequency electric, electric capacity is direct conductor, and then finger siphons away an only small electric current from contact point.This electric current flows out respectively from the electrode the corner of touch screen, and the distance of the electric current and finger to corner flowing through these four electrodes is directly proportional, and controller, by the accurate calculating to these four current ratios, draws the position of touch point.
In capacitive touch screen, conductive silver paste is primarily used to do the electrode material of four limits or four pins, and each electrode is conducting wire one group fine, and this is organized conducting wire or is directly prepared into by silk-screen, first silk-screen becomes thicker silver wire, then is etched into fine circuit.The circuit fineness of direct silk-screen is relatively low, and under the premise ensureing yield, the circuit of general more than 70 μm just adopts direct silk screen printing process；Comparatively speaking, etch process the most carefully can make circuit 30 μm even thinner, and precision and yield are all higher.Along with the development of Mobile phone touch control technology, narrow frame high-end smartphones is extensively favored by market, thus the live width of touch screen circuit, line-spacing are required also higher.
nullApplication number be 201310387410.1 Chinese invention patent disclose a kind of conductive silver paste for touch screens and preparation method thereof，It is by silver powder 55～70%、Epoxy resin 5～15%、Polyester resin 5～15%、Powdered graphite 0.1～1%、SiO 2 powder 1～2%、Diethylene glycol ether acetate 5～15% and butyl acetate 5～15% composition，Wherein，Silver powder is by the micro-silver powder end that mass ratio is 1:20～1:30 and nanometer silver powder constituent，The particle diameter at described micro-silver powder end is 10～20 μm，The particle diameter of described nanometer silver powder is 60～90nm，Concrete preparation process is: first by the epoxy resin of formula ratio、Polyester resin、Diethylene glycol ether acetate、Butyl acetate is uniformly dispersed，Obtain organic carrier；Again the silver powder of formula ratio, powdered graphite, SiO 2 powder are joined organic carrier and be uniformly dispersed, namely obtain product.In the technical scheme of above-mentioned patent disclosure, slurry is relatively big due to silver powder particles, deposits the technical problems such as line edges after the etching is rough.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and a kind of conductive silver paste for capacitive touch screen laser-induced thermal etching fine-line technique and preparation method thereof is provided.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, this conductive silver paste includes following components and weight portion content: silver powder 65～80 parts, organic carrier 5～10 parts, organic solvent 3～23 parts, defoamer 0.1～1 part, levelling agent 0.1～1 part, anti-Pericarpium Citri Reticulatae agent 0.1～1 part, thixotropic agent 0～1 part and pigment 0～1 part.
The component of described conductive silver paste and weight portion content are preferably: silver powder 70～71 parts, organic carrier 9～10 parts, organic solvent 19～20 parts, defoamer 0.3～0.4 part, levelling agent 0.4～0.5 part, anti-Pericarpium Citri Reticulatae agent 0.2～0.3 part, thixotropic agent 0.8～0.9 part and pigment 0.9～1 part.
Described silver powder is flake silver powder, and the particle diameter of this flake silver powder is 0.2～5 μm, and tap density is 3～4g/ml.
The particle diameter of described flake silver powder preferably 0.4～0.6 μm, tap density is 3.5～4g/ml preferably.
Described organic carrier adopts macromolecule resin and organic solvent mixed preparing to form, concrete compound method is: be 1:(3～6 by the mass ratio of macromolecule resin Yu organic solvent), macromolecule resin is joined in organic solvent, it is heated to 70～80 DEG C, constant temperature, until macromolecule resin is completely dissolved, is cooled to less than 40 DEG C, it is filtered remove impurity with the screen cloth of 300～400 orders, namely prepares organic carrier.
Described macromolecule resin is one or both in polyacrylic resin, polyurethane resin or saturated polyester resin, and the relative molecular mass of described macromolecule resin is 20000～35000, fracture elongation > 120%, glass transition temperature > 10 DEG C.
Described organic solvent is one or both in ketone or esters solvent, and the boiling range of described organic solvent is 120～230 DEG C, fusing point <-20 DEG C；Described defoamer is the one of polyethers, polysiloxane-based or polyether modified siloxane apoplexy due to endogenous wind；Described levelling agent is silicone based or esters of acrylic acid one；Described anti-Pericarpium Citri Reticulatae agent is organosilicon compound；Described thixotropic agent is gas-phase silica, and described pigment is the one in graphite microparticles or white carbon black.
The preferred Ketohexamethylene of described organic solvent or propylene glycol methyl ether acetate；Described defoamer preferred, polyethers modified siloxane；Described levelling agent optimization polypropylene acid esters；The preferred organically-modified silica alkane of described anti-Pericarpium Citri Reticulatae agent.
Preferred, polyethers modified siloxane can effectively suppress or eliminate, as defoamer, the bubble that in preparation, stirring, work progress, slurry produces, thus short-term probability when reducing fine-line printing；Optimization polypropylene acid esters as levelling agent, its can the difference of equlibrated slurry moisture membrane surface tension force, thus obtaining the fine-line with real smooth performance；Preferred organically-modified oxygen alkane is as anti-Pericarpium Citri Reticulatae agent, and it can stop the generation of film surface defects, and these defects are mainly the irregular ripple texture as orange peel surface.
A kind of preparation method of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, the method specifically includes following steps:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed 50～55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 30～45Pa s, after filtration, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
The present invention is by first organic carrier and organic solvent being mixed, it is configured to uniform colloid solution, then, it is sequentially added into defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, it is eventually adding silver powder, after the techniques such as batch mixer mixing, three-roll grinder grinding, filtration, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
The present invention passes through silver powder and applicable macromolecule resin, the organic solvent system that preferred particle size is suitable for, it is possible to meet requirement and the properties of product requirement of capacitive touch screen fine-line laser etch process well.
Compared with prior art, the invention have the characteristics that:
1) owing to employing particle diameter is 0.2～5 μm, it is the conductive silver paste that 0.4～0.6 μm of flake silver powder is made especially with particle diameter, during for laser etch process, it is possible to obtain the very smooth circuit in edge, and the extra fine wire etched can reach 20 μm from, wire diameter；
2) owing to defoamer, levelling agent, thixotropic agent and anti-Pericarpium Citri Reticulatae agent are configured in rational ratio so that the conducting wire surfacing of silk-screen, without shrinkage cavity, without open circuit, it is possible to effectively promote the yield of silver conducting wire manufacturing process；
3) selecting the macromolecule resin of suitable molecular weight, it has good dissolubility in organic solvent, prepares the conductive silver paste of gained, modest viscosity, resistance is relatively low, and adhesive force is strong, itself and PET base material adhesive force can reach 5B level, and case hardness is big, and hardness can reach more than 3H.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 70 parts, organic carrier 9 parts, organic solvent 19 parts, defoamer 0.4 part, levelling agent 0.4 part, anti-Pericarpium Citri Reticulatae agent 0.2 part, thixotropic agent 0.8 part and pigment 0.9 part.
Wherein, silver powder is flake silver powder, and particle diameter is 0.4 μm, and tap density is 3.8g/ml.
The compound method of organic carrier is: be 1:4 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 80 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 400 orders, namely prepare organic carrier.
Macromolecule resin is polyurethane resin, and relative molecular weight is 30000, fracture elongation > 120%, glass transition temperature > 10 DEG C, organic solvent is Ketohexamethylene.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 30Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polyether modified siloxane, and levelling agent is polyacrylate, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica, and pigment is graphite microparticles.
The present embodiment prepares the conductive silver paste of gained, and before solidifying, quantitative measurement result is in Table 1, and after solidification, quantitative measurement result is in Table 2.
Table 1 solidifies front physical property and characterizes
After table 2 solidifies, physical property characterizes
In table 1 and table 2, the method for testing of physical properties is:
Viscosity BROOKFIELDDV-I+VISCOMETER, S14,5rpm, 25 DEG C, Pa.s；
Argentum powder size laser particle size analyzer；
Solid content 135 DEG C toasts 60 minutes；
Spreading area build 6～10 μm；
Slurry sheet resistance circuit tester；
Adhesive force hundred lattice experiment (ITO/PET film), 3M600 adhesive tape, vertically draws；
Hardness (H) China pencil.
The conductive silver paste that the present embodiment is prepared gained adopts 400 order polyester nets to be printed on ITO/PET diaphragm, printed wire is five one group, every circuit line length 150mm, live width 8mm, after 135 DEG C of bakings 60 minutes, adopt laser etching machine etching line from the circuit that, live width is 30 μm.The circuit etched line edges under the microscope is clear, and actual, measured dimension meets designing requirement.
Embodiment 2:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 70.8 parts, organic carrier 9.4 parts, organic solvent 19.6 parts, defoamer 0.3 part, levelling agent 0.5 part, anti-Pericarpium Citri Reticulatae agent 0.3 part, thixotropic agent 0.9 part and pigment 1 part.
Wherein, silver powder is flake silver powder, and particle diameter is 0.6 μm, and tap density is 4g/ml.
The compound method of organic carrier is: be 1:4 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 80 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 400 orders, namely prepare organic carrier.
Macromolecule resin is saturated polyester resin, and relative molecular weight is 24000, fracture elongation > 120%, glass transition temperature > 10 DEG C, organic solvent is Ketohexamethylene.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 40Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polysiloxanes, and levelling agent is polyacrylate, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica, and pigment is white carbon black.
Embodiment 3:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 71 parts, organic carrier 10 parts, organic solvent 20 parts, defoamer 0.4 part, levelling agent 0.5 part, anti-Pericarpium Citri Reticulatae agent 0.3 part, thixotropic agent 0.8 part and pigment 0.9 part.
Wherein, silver powder is flake silver powder, and particle diameter is 0.5 μm, and tap density is 3.5g/ml.
The compound method of organic carrier is: be 1:3 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 78 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 400 orders, namely prepare organic carrier.
Macromolecule resin is polyacrylic resin, and relative molecular weight is 35000, fracture elongation > 120%, glass transition temperature > 10 DEG C, organic solvent is propylene glycol methyl ether acetate.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 50 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 35Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polyethers, and levelling agent is organosilicon, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica, and pigment is graphite microparticles.
Embodiment 4:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 65 parts, organic carrier 7 parts, organic solvent 16 parts, defoamer 0.5 part, levelling agent 0.6 part, anti-Pericarpium Citri Reticulatae agent 0.6 part, thixotropic agent 0.3 part and pigment 0.2 part.
Wherein, silver powder is flake silver powder, and particle diameter is 0.2 μm, and tap density is 3/ml.
The compound method of organic carrier is: be 1:3 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 80 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 300 orders, namely prepare organic carrier.
Macromolecule resin is saturated polyester resin is the mixing macromolecule resin of 1:1 in mass ratio with polyurethane resin, wherein, the relative molecular weight of saturated polyester resin is 24000, the relative molecular mass of polyurethane resin is 30000, the fracture elongation of saturated polyester resin and polyurethane resin>120%, glass transition temperature>10 DEG C, organic solvent be Ketohexamethylene with propylene glycol methyl ether acetate in mass ratio for the mixed organic solvents of 1:2, boiling range is 120～230 DEG C, fusing point<-20 DEG C.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 30Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polyethers, and levelling agent is polyacrylate, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica, and pigment is white carbon black.
Embodiment 5:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 75 parts, organic carrier 8 parts, organic solvent 18 parts, defoamer 0.1 part, levelling agent 0.3 part, anti-Pericarpium Citri Reticulatae agent 0.1 part, thixotropic agent 1 part and pigment 0.3 part.
Wherein, silver powder is flake silver powder, and particle diameter is 0.8 μm, and tap density is 3.3/ml.
The compound method of organic carrier is: be 1:5 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 70 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 300 orders, namely prepare organic carrier.
Macromolecule resin is polyacrylic resin is the mixing macromolecule resin of 1:2 in mass ratio with polyurethane resin, wherein, the relative molecular weight of polyacrylic resin is 20000, the relative molecular mass of polyurethane resin is 25000, the fracture elongation of polyacrylic resin and polyurethane resin>120%, glass transition temperature>10 DEG C, organic solvent be Ketohexamethylene with propylene glycol methyl ether acetate in mass ratio for the mixed organic solvents of 3:5, boiling range is 120～230 DEG C, fusing point<-20 DEG C.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 32Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polyether modified siloxane, and levelling agent is organosilicon, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica, and pigment is graphite microparticles.
Embodiment 6:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 80 parts, organic carrier 10 parts, organic solvent 23 parts, defoamer 1 part, levelling agent 1 part, anti-Pericarpium Citri Reticulatae agent 1 part, thixotropic agent 0.7 part and pigment 0.7 part.
Wherein, silver powder is flake silver powder, and particle diameter is 5 μm, and tap density is 3g/ml.
The compound method of organic carrier is: be 1:6 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 80 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 400 orders, namely prepare organic carrier.
Macromolecule resin is polyacrylic resin is the mixing macromolecule resin of 1:3 in mass ratio with polyurethane resin, wherein, the relative molecular weight of polyacrylic resin is 30000, the relative molecular mass of polyurethane resin is 35000, the fracture elongation of polyacrylic resin and polyurethane resin>120%, glass transition temperature>10 DEG C, organic solvent be Ketohexamethylene with propylene glycol methyl ether acetate in mass ratio for the mixed organic solvents of 3:4, boiling range is 120～230 DEG C, fusing point<-20 DEG C.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 45Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polysiloxanes, and levelling agent is organosilicon, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica, and pigment is graphite microparticles.
Embodiment 7:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 76 parts, organic carrier 5 parts, organic solvent 3 parts, defoamer 0.1 part, levelling agent 0.1 part, anti-Pericarpium Citri Reticulatae agent 0.1 part, thixotropic agent 0.2 part.
Wherein, silver powder is flake silver powder, and particle diameter is 4 μm, and tap density is 3.2g/ml.
The compound method of organic carrier is: be 1:4 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 80 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 400 orders, namely prepare organic carrier.
Macromolecule resin is polyacrylic resin is the mixing macromolecule resin of 1:1 in mass ratio with polyurethane resin, wherein, the relative molecular weight of polyacrylic resin is 20000, the relative molecular mass of polyurethane resin is 25000, the fracture elongation of polyacrylic resin and polyurethane resin>120%, glass transition temperature>10 DEG C, organic solvent be Ketohexamethylene with propylene glycol methyl ether acetate in mass ratio for the mixed organic solvents of 1:1, boiling range is 120～230 DEG C, fusing point<-20 DEG C.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent and anti-Pericarpium Citri Reticulatae agent, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 38Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polyethers, and levelling agent is organosilicon, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica.
Embodiment 8:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 68 parts, organic carrier 6 parts, organic solvent 12 parts, defoamer 0.8 part, levelling agent 0.6 part, anti-Pericarpium Citri Reticulatae agent 0.5 part, pigment 0.3 part.
Wherein, silver powder is flake silver powder, and particle diameter is 2 μm, and tap density is 3g/ml.
The compound method of organic carrier is: be 1:3 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 75 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 400 orders, namely prepare organic carrier.
Macromolecule resin is polyacrylic resin, and relative molecular weight is 32000, fracture elongation > 120%, glass transition temperature > 10 DEG C, organic solvent is propylene glycol methyl ether acetate.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 32Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polyether modified siloxane, and levelling agent is organosilicon, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and pigment is graphite microparticles.
Embodiment 9:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 74 parts, organic carrier 7 parts, organic solvent 17 parts, defoamer 0.2 part, levelling agent 0.8 part, anti-Pericarpium Citri Reticulatae agent 0.6 part, thixotropic agent 0.6 part and pigment 0.5 part.
Wherein, silver powder is flake silver powder, and particle diameter is 1 μm, and tap density is 3.4/ml.
The compound method of organic carrier is: be 1:5 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 78 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 400 orders, namely prepare organic carrier.
Macromolecule resin is polyacrylic resin is the mixing macromolecule resin of 1:2 in mass ratio with saturated polyester resin, wherein, the relative molecular weight of polyacrylic resin is 20000, the relative molecular mass of saturated polyester resin is 20000, the fracture elongation of polyacrylic resin and saturated polyester resin>120%, glass transition temperature>10 DEG C, organic solvent be Ketohexamethylene with propylene glycol methyl ether acetate in mass ratio for the mixed organic solvents of 3:5, boiling range is 120～230 DEG C, fusing point<-20 DEG C.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 30Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polyether modified siloxane, and levelling agent is polyacrylate, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica, and pigment is graphite microparticles.
Embodiment 10:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 67 parts, organic carrier 6 parts, organic solvent 15 parts, defoamer 0.7 part, levelling agent 0.9 part, anti-Pericarpium Citri Reticulatae agent 0.7 part, thixotropic agent 0.7 part and pigment 0.9 part.
Wherein, silver powder is flake silver powder, and particle diameter is 0.2 μm, and tap density is 4/ml.
The compound method of organic carrier is: be 1:4 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 80 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 400 orders, namely prepare organic carrier.
Macromolecule resin is polyacrylic resin is the mixing macromolecule resin of 1:4 in mass ratio with saturated polyester resin, wherein, the relative molecular weight of polyacrylic resin is 30000, the relative molecular mass of saturated polyester resin is 32000, the fracture elongation of polyacrylic resin and saturated polyester resin>120%, glass transition temperature>10 DEG C, organic solvent be Ketohexamethylene with propylene glycol methyl ether acetate in mass ratio for the mixed organic solvents of 1:1, boiling range is 120～230 DEG C, fusing point<-20 DEG C.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 36Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polyether modified siloxane, and levelling agent is organosilicon, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica, and pigment is white carbon black.
Embodiment 11:
In the present embodiment, a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, including following components and weight portion content: silver powder 66 parts, organic carrier 7 parts, organic solvent 13 parts, defoamer 0.8 part, levelling agent 0.7 part, anti-Pericarpium Citri Reticulatae agent 0.8 part, thixotropic agent 0.6 part and pigment 0.6 part.
Wherein, silver powder is flake silver powder, and particle diameter is 0.6 μm, and tap density is 3/ml.
The compound method of organic carrier is: be 1:4 by the mass ratio of macromolecule resin Yu organic solvent, macromolecule resin is joined in organic solvent, it is heated to 80 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, is filtered remove impurity with the screen cloth of 400 orders, namely prepare organic carrier.
Macromolecule resin is polyacrylic resin is the mixing macromolecule resin of 1:3 in mass ratio with saturated polyester resin, wherein, the relative molecular weight of polyacrylic resin is 30000, the relative molecular mass of saturated polyester resin is 32000, the fracture elongation of polyacrylic resin and saturated polyester resin>120%, glass transition temperature>10 DEG C, organic solvent be Ketohexamethylene with propylene glycol methyl ether acetate in mass ratio for the mixed organic solvents of 2:3, boiling range is 120～230 DEG C, fusing point<-20 DEG C.
Concrete preparation process is as follows:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed is 50 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 42Pa s, after quick agitating heating, filter with 800 order polyester nets rapidly, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
Wherein, defoamer is polyether modified siloxane, and levelling agent is organosilicon, and anti-Pericarpium Citri Reticulatae agent is organically-modified silica alkane, and thixotropic agent is gas-phase silica, and pigment is graphite microparticles.
Claims (9)
1. a capacitive touch screen fine-line laser-induced thermal etching conductive silver paste, it is characterized in that, this conductive silver paste includes following components and weight portion content: silver powder 65～80 parts, organic carrier 5～10 parts, organic solvent 3～23 parts, defoamer 0.1～1 part, levelling agent 0.1～1 part, anti-Pericarpium Citri Reticulatae agent 0.1～1 part, thixotropic agent 0～1 part and pigment 0～1 part.
2. a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste according to claim 1, it is characterized in that, the component of described conductive silver paste and weight portion content are preferably: silver powder 70～71 parts, organic carrier 9～10 parts, organic solvent 19～20 parts, defoamer 0.3～0.4 part, levelling agent 0.4～0.5 part, anti-Pericarpium Citri Reticulatae agent 0.2～0.3 part, thixotropic agent 0.8～0.9 part and pigment 0.9～1 part.
3. a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste according to claim 1, it is characterised in that described silver powder is flake silver powder, and the particle diameter of this flake silver powder is 0.2～5 μm, and tap density is 3～4g/ml.
4. a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste according to claim 3, it is characterised in that the particle diameter of described flake silver powder preferably 0.4～0.6 μm, tap density is 3.5～4g/ml preferably.
5. a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste according to claim 1, it is characterized in that, described organic carrier adopts macromolecule resin and organic solvent mixed preparing to form, concrete compound method is: be 1:(3～6 by the mass ratio of macromolecule resin Yu organic solvent), macromolecule resin is joined in organic solvent, it is heated to 70～80 DEG C, constant temperature, until macromolecule resin is completely dissolved, it is cooled to less than 40 DEG C, it is filtered remove impurity with the screen cloth of 300～400 orders, namely prepares organic carrier.
6. a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste according to claim 5, it is characterized in that, described macromolecule resin is one or both in polyacrylic resin, polyurethane resin or saturated polyester resin, the relative molecular mass of described macromolecule resin is 20000～35000, fracture elongation > 120%, glass transition temperature > 10 DEG C.
7. a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste according to claim 1, it is characterized in that, described organic solvent is one or both in ketone or esters solvent, and the boiling range of described organic solvent is 120～230 DEG C, fusing point <-20 DEG C；Described defoamer is the one of polyethers, polysiloxane-based or polyether modified siloxane apoplexy due to endogenous wind；Described levelling agent is silicone based or esters of acrylic acid one；Described anti-Pericarpium Citri Reticulatae agent is organosilicon compound；Described thixotropic agent is gas-phase silica；Described pigment is the one in graphite microparticles or white carbon black.
8. a kind of capacitive touch screen fine-line laser-induced thermal etching conductive silver paste according to claim 7, it is characterised in that the preferred Ketohexamethylene of described organic solvent or propylene glycol methyl ether acetate；Described defoamer preferred, polyethers modified siloxane；Described levelling agent optimization polypropylene acid esters；The preferred organically-modified silica alkane of described anti-Pericarpium Citri Reticulatae agent.
9. the preparation method of a capacitive touch screen fine-line laser-induced thermal etching conductive silver paste as claimed in claim 1, it is characterised in that the method specifically includes following steps:
(1) get the raw materials ready according to following components and weight portion:
(2) preparation of conductive silver paste: in batch mixer, according to the weight portion in step (1), first organic carrier is joined in organic solvent, it is mixed into uniform colloid solution, add defoamer, levelling agent, thixotropic agent, anti-Pericarpium Citri Reticulatae agent and pigment, be eventually adding silver powder, after being sufficiently mixed, it is placed in high speed dispersor again and carries out high speed dispersion, prepare uniform conductive silver paste；
(3) production of capacitive touch screen conductive silver paste: the conductive silver paste that step (2) prepares is joined in three-roll grinder and is ground, fine setting roller rotating speed 50～55 revs/min, make the fineness < 10 μm of conductive silver paste, viscosity is 30～45Pa s, after filtration, namely prepare capacitive touch screen fine-line laser-induced thermal etching conductive silver paste.
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| CN106297955A (en) * | 2016-09-30 | 2017-01-04 | 天津宝兴威科技有限公司 | A kind of nano silver conductive paste |
| CN107236099A (en) * | 2017-06-01 | 2017-10-10 | 长兴化学工业(中国)有限公司 | Acrylate urethane copolymer resins and the conductive silver paste containing the resin |
| CN110070956A (en) * | 2019-05-20 | 2019-07-30 | 深圳市博耀新材料有限公司 | A kind of nanometer silver paste and preparation method thereof for ultra fine-line laser engraving |
| CN110097998A (en) * | 2018-01-31 | 2019-08-06 | 上海宝银电子材料有限公司 | A kind of transfer printing process conductive silver paste for touch screens and preparation method thereof |
| CN110853795A (en) * | 2019-11-22 | 2020-02-28 | 广州精卓化工有限公司 | Laser etching type conductive silver paste and preparation method and application thereof |
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| CN110853795A (en) * | 2019-11-22 | 2020-02-28 | 广州精卓化工有限公司 | Laser etching type conductive silver paste and preparation method and application thereof |
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