100results about How to "Small contraction force" patented technology

The preparation method of nano rare earth oxide powder uses rare earth oxide as raw material, and includes the following steps: adding hydrochloric acid or nitric acid solution and ammonium hydrogen carbonate solution to produce rare earth carbonate precipitate, filtering, adding 1-10 wt% of surfactant in rare earth carbonate filter cake, heating to 30-100 deg.C, stirirng for 3-8 hr. to form solid foam, oven-drying, calcining to obtain the nano rare earth oxide powder. Its grain size is less than 100 nm, specific area is above 10 sq.m / g, and its agglomeration body grain size D50 is less than 400 nm and D90 is less than 1.0 micrometers.

The invention discloses anti-cracking steam-curing-free ultra-high-strength high-toughness concrete. The anti-cracking steam-curing-free ultra-high-strength high-toughness concrete is prepared from cement, fly ash, silica fume, a mineral activator with cementing property, gravel, river sand, steel fibers, a polymer emulsion, water and a shrinkage-reducing super-dispersing admixture, wherein the mineral activator with cementing property comprises waste prefabricated concrete set cement crystal seeds and desulfurized gypsum. By using the mineral activator with cementing property in the concrete, high-temperature steam curing and pressurized steam curing systems adopted in the ordinary ultra-high-performance concrete are eliminated; and the shrinkage-reducing super-dispersing admixture having the functions of super-dispersing cement, reducing shrinkage, decreasing viscosity and the like is adopted to enable the hydration activity of cement to give a full play so that the strength of the concretes has no obvious change after cement usage is decreased by about 10%; and meanwhile, the mineral activator and the admixture can effectively suppress the shrinkage of concrete. The concrete prepared by the preparation method is higher in strength, toughness and shrinkage resistance, low in cost and simple in preparation method and has important practical application value.

The invention belongs to the field of beautifying medicines, and in particular relates to a pure traditional Chinese medicinal female beautifying preparation. The preparation is characterized by comprising the following components in parts by weight: 20-30 parts of bee pollen, 15-20 parts of honeysuckle, 25-35 parts of fingered citron, 15-25 parts of radix polygonati officinalis, 12-17 parts of American ginseng, 30-40 parts of kudzuvine root, 40-50 parts of yam, 30-40 parts of Chinese angelica, 25-35 parts of medlar, 10-15 parts of donkey-hide gelatin, 30-40 parts of hawthorn, 12-17 parts of peach kernel, and 30-40 parts of sealwort. The pure traditional Chinese medicinal female beautifying preparation has the functions of tonifying qi and nourishing blood, clearing and activating the channels and collaterals, removing blood stasis for promoting tissue regeneration, and beautifying and removing speckles, and is safe and efficient.

The invention relates to a heat-insulating layer of a rare earth complex wall body and the manufacturing method of heat-insulating layer material, which belongs to the field of architectural materials. The invention is characterized in that the process for preparation comprises mixing rare earth rubber powder by weight ratio that rubber powder: water = 1:1 to 1.5, adding polyphenyl particles into material which is mixed, the proportion is that rubber powder: EPS particles = 1 kg: 8 L, continuously mixing for 5-10 min to make rare earth rubber powder EPS particle heat-insulating material, mixing rare earth trowel finish sand with water according to the proportion that rare earth trowel finish sand: water = 1: 1 into slurry, making rare earth trowel finish sand slurry, and brushing rare earth rubber powder EPS particle heat-insulating material, trowel finish sand slurry, standard net cloth, rare earth trowel finish sand slurry, flexible putty and face coat on the base layer of the wall body in turn. The invention has good heat-insulating property, strong binding power, high compression strength, good water resistance and flame proof, which is antiseptic, noncorrosive, nontoxic, tasteless and pollution-free, has the function of absorbing ultraviolet ray and infrared ray, and has quick coagulate speed, rapid increase of the strength of materials, and the construction procedure is rapid, timesaving and laborsaving.

The invention relates to an active extract for sanwei sandalwood as well as an extraction method and a medical application thereof. The extract comprises the following active components of medicaments: fructus choerospondiatis total flavonoids, fructus choerospondiatis total phenolic acid, nutmeg total lignans, nutmeg total phenolic acid, sandalwood volatile oil and nutmeg volatile oil.

The invention provides a film LED (light-emitting diode) chip device, comprising a GaN-based epitaxial film base which is provided with an etching groove, and a fixed film which is coated on a GaN-based epitaxial film, wherein a metal reflection layer is attached to the surface of the P-shaped semiconductor layer of the GaN-based epitaxial film base, passive films are deposited on the metal reflection layer and the GaN-based epitaxial film base to form the GaN-based epitaxial film, the passive film on the surface of the metal reflection layer and the passive film on the bottom surface of the etching groove are respectively provided with a hollowed-out area, a P pole multilayer metal bonding layer and a N pole multilayer metal bonding layer are respectively arranged on the corresponding hollowed-out area, and a P pole conductive support thick metal layer and an N pole conductive support thick metal layer are respectively arranged on the P pole multilayer metal bonding layer and the N pole multilayer metal bonding layer. The invention also provides a manufacturing method and application of the film LED chip device. According to the invention, the occurrence rate of wafer fracture and the probability of wafer deformation in the subsequent laser stripping process are reduced, and the yield of products is improved.

The invention relates to a vacuum freeze drying process for a ceramic mould body. The vacuum freeze drying process comprises the steps of putting a water based ceramic mould body moulded by using the wet method in a vacuum freeze drier for prefreezing; after the water in the body is completely crystallized; the vacuum freeze drier is vacuumized while the temperature of the material is controlled so that the water is directly sublimed into water vapor and is pumped away; after the material is completely dry, the ceramic mould body with small drying shrinkage without crack. By applying the vacuum freeze drier in the preparation of the ceramic mould body, the shrinkage of the ceramic mould at the dry stage is significantly reduced; the dimensional accuracy is improved; the probability of distortion and crack is reduced. The vacuum freeze drying process is in particular applicable for drying ceramic mould bodies in complicated shapes.

The invention discloses low-silver-content graphene composite conductive silver paste. The low-silver-content graphene composite conductive silver paste is composed of, by weight, 5-15 parts of graphene microchips, 30-50 parts of silver plated glass powder, 5-15 parts of macromolecule resin, 20-40 parts of organic solvent, 1-4 parts of levelling agent and 0.1-1.5 parts of defoamer. The conductive particle graphene microchips and the silver plated glass powder adopted in the silver paste are of a sheet structure respectively, gaps among conductive particles are effectively reduced, stacking density of conductive films is increased, contact area of the particles is enlarged, contractility of the films is reduced, and conductivity of the silver pates is improved; being low in weight and only accounting for 10-20% of pure silver powder, the graphene microchips and the silver plated glass powder which are light do not easily settle in organic carriers, so that stability of the conductive silver paste is improved.

The invention discloses an all-aluminum back-field back silver paste, a preparation method thereof, and an application thereof. The all-aluminum back-field back silver paste comprises the follow materials of, by weight, 10 to 80 parts of specially required silver powder with the purity larger than 99.99%, 0.5 to 5 parts of self-made lead-free main body glass powder, 0 to 3 parts of low-melting-point auxiliary glass powder, 1 to 50 parts of specially required low-melting-point metal powder, 15 to 50 parts of organic binders, and 0.01 to 1 part of organic auxiliary. The all-aluminum back-field back silver paste can be directly printed on an aluminum back-field paste, the considerable welding tensile force and aging tensile force of the all-aluminum back-field back silver paste are guaranteed, a serious electric leakage problem caused by a metal defect generated by the direct contact between silver and a silicon wafer is avoided, therefore, the photoelectric conversion efficiency of a crystalline silicon battery is improved, the width of a back electrode and a printed pattern can be adjusted at will, and therefore, the cost of a back electrode paste is reduced.

The invention provides an organic light-emitting display panel and a display device and particularly relates to the technical field of display. The organic light-emitting display panel comprises a substrate, an organic light-emitting device located on the substrate, a polarization structure located at a light outlet side of the organic light-emitting device, and a packaging structure, wherein thepolarization structure sequentially comprises a quarter-wave plate layer, a metal wire grid layer and a polarization substrate layer in a light outlet direction of the organic light-emitting device; and the packaging structure is located at one side, far away from the substrate, of the polarization substrate layer. A polarizer structure provided by the invention is designed into a stack structurecomprising the polarization substrate layer, the metal wire grid layer and the quarter-wave plate layer and is integrated into the organic light-emitting display panel, so that the transmittance of ashort wave band is also effectively improved while the thickness of the display panel is reduced; and meanwhile, light reflected from the organic light-emitting device directly enters a quarter-wave plate and the scattering phenomenon when the light is outside is eliminated, so that the organic light-emitting display panel is higher in polarization effect and greater in inhibiting effect on ambient light reflection.

The invention discloses a high-flatness rigid-flex board provided with ink windows shaped like dual nested rectangles and a manufacturing method. The manufacturing method comprises steps as follows: step 1, solder resist ink covers, is printed on a rigid circuit board of the rigid-flex board in a silk-screen manner and is precured and baked at the low temperature of 80-100 DEG C; step 2, a pattern on a solder mask film is designed to be shaped like dual nested rectangles and is transferred to the solder resist ink for exposure, and the solder resist ink in a black area doesn't have a chemical polymerization reaction and is washed away by a solution of a solder mask developer to form the windows shaped like dual nested rectangles; the solder resist ink located outside a shading area is subjected to illumination exposure, has a chemical polymerization reaction and accordingly is prevented from being washed away by the solution of the solder mask developer, and an ink bridge is formed between every two windows shaped like dual nested rectangles; step 3, high-temperature baking is performed at the temperature of 150-180 DEG C; step 4, surface processing is performed, and electroless gold plating forming is realized. Difference of ink areas on front and reverse surfaces of the rigid-flex board is avoided, and the flatness is high.

The invention relates to a traditional Chinese medicine plaster preparing method, especially a traditional Chinese medicine plaster having caring function to dysmenorrhoea and preparation method thereof. The preparation method comprises the following processes: i), weighing the raw material medicines by weight parts of: Ligusticum wallichii 120 parts, Chinese angelica 190 parts, Cyperus Rotundus L. 160 parts, rhizoma corydalis 120 parts, Fructus Foeniculi 90 parts and bitter organe 90 parts, and grinding; adding 10-15 times of water to the above raw material medicines, distilling and extracting the volatile oil; ii), adding the obtained volatile oil into a solvent, adding cosolvent at same time, fully stirring, adding borneol and / or camphor, fully stiring, and adding transdermal absorbent; iii), applying the applied slurry onto cloth, covering with a lining film, cutting and packaging. The invention further provides a traditional Chinese medicine plaster comprising the following components by weight percentages of: volatile oil 0.1-10%, borneol and / or camphor which is 0.05-0.08% of the total weight, cosolvent ethanol 1-5%, transdermal absorbent laurel 1-n-Dodecylazacycloneptan-2-one 0.1-0.3% and solvent propylene glycol for complementing to 100%.

The invention discloses insulating paint and belongs to the technical field of paint. The insulating paint is prepared from, by weight, 5-20 parts of nano carbon crystal, 25-40 parts of polyimide, 30-50 parts of epoxy resin, 0.1-1 part of a dispersant, 0.1-2 parts of flatting agent, 0.2-1.0 part of a corrosion inhibitor, 0.1-2 parts of a defoamer and 0.1-3 parts of lysozyme. A preparation method of the insulating paint includes: mixing polyimide with the epoxy resin at 65-80 DEG C; adding nano carbon crystal, the dispersant, the flatting agent, the corrosion inhibitor, the defoamer and lysozyme; stirring. Raw materials are reasonably combined to form the waterborne insulating paint, and the insulating paint has good insulativity, adhesiveness and cohesiveness, a paint film is high in hardness and fullness, the surface of the paint film is uniform, compact, smooth and micropore-free, and the insulating paint has good mechanical performance, wear resistance and scratch resistance.

The invention provides a Chinese medicament for treating cardiovascular diseases and its preparing process, which comprises the following constituents (by weight portions), astragalus root 1000-2000, rhizome of Sichuan lovage 500-1000, kuh-seng 500-1000.

A low temperature thermoplastic material is provided. The components include in weight parts: polyurethane with a melting point of 50-70° C. 90-10 parts, poly(ε-caprolactone) 0-90 parts and cross linking co-agent 0.1-6 parts. Compared with the prior poly(ε-caprolactone) low temperature thermoplastic material, the present low temperature thermoplastic material has a smaller shrinking force and a better fastening intensity, is more comfortable and can be stretched more uniformly after moulding. Therefore, the material is suitable for hospital and other radiotherapy institution and can be used compatibly with three-dimensional conformal radiotherapy equipments in tumor surgery.

The invention discloses power relay equipment for an insulating building. The power relay equipment comprises a base, a coil, an armature, a restoring spring, a push rod, contacts, a lower plate spring, a middle ratchet wheel and an upper plate spring, wherein an insulating shell is arranged above the base; an iron core is arranged in the insulating shell through a bracket; the coil is arranged on the iron core; the bracket is connected with the restoring spring. The power relay equipment for the insulating building, disclosed by the invention, is simple in structure and convenient to operate; the armature attracts the iron core under the action of electromagnetic attraction to drive the push rod to rotate the middle ratchet wheel anticlockwise; the plate springs move, so that a contact state of upper and lower layers of the contacts is changed; when driving electric pulse disappears, the armature returns to an initial state under the action of the restoring spring, a ratchet abuts against a tooth surface on a seedling wheel and the ratchet wheel does not rotate, so that the contacts can keep the state unchanged; only if the quantity of teeth and tooth shapes of upper and lower layers of ratchet wheels are changed, 2 to 4 steps form one cycle of 1 to 2 contacts, and different control functions are realized.

The invention relates to a preparing method for a polarizer. The method can manufacture a polarizer with a high quadrature b value, few uneven dyeing phenomena, and an improved polarization degree due to containing more I3-containing complex. The method steps of swelling, dyeing, stretching, crosslinking, color complementing, water washing, and drying the polarizer forming film. A thermal pretreatment steps is included between the color complementing and water washing stepes.

The invention discloses conductive lead-free silver paste mixed with copper powder and aluminum powder for a solar cell and a preparation method of the conductive lead-free silver paste. The conductive silver paste is obtained by mixing two parts of slurries including A and B according to equal proportion and subjecting the mixture to ball milling. The silver paste prepared is free of lead, less harmful to human body and environment, and completely in conformity with environmental requirements. By selecting silver power uniform in particle size for the silver paste and other conducting particles to fill gaps of the silver powder, stacking density of a film is improved, contact area between particles is enlarged, convergent force of the film is reduced, and conducting capability of the silver paste is improved. By adding aluminum powder and copper powder into conductive slurry, reduction of preparation cost of the silver paste is facilitated, conductivity of the silver paste is improved, thus manufacturing cost of the solar cells is reduced, and good economic benefit is gained.

The invention discloses a silver paste for an environmental-friendly lead-free silicon solar cell electrode and a preparation method of the silver paste. The silver paste is prepared from a slurry A and a slurry B through mixing and ball-grinding at an equal proportion. The silver paste prepared by adopting the preparation method does not contain lead, is little in damage to a human body and an environment, and completely accords with the requirements of environmental friendliness and no lead. According to the invention, silver powder with same particle diameter and other conductive particles are selected to be filled in gaps among the silver powder, thus the packing density of a membrane layer is increased, the contact area among the particles is increased, and the contraction force of the membrane layer is lowered, thus the conduction capacity of the silver paste is increased. According to the invention, copper powder and aluminum powder are added in the conductive paste, thus the production cost of the silver paste is favorably lowered, and the conduction property of the silver paste is improved, therefore, the purpose of reducing manufacture cost of a solar cell is achieved, and a better economic benefit is obtained.

It is an aim of the present invention to provide an apparatus and a method for manufacturing a ball joint which can reduce torque generated between a ball stud and a ball seat. For this purpose, the present invention comprises an upper mold, the interior of which is shaped for injection-molding a ball seat made of synthetic resin materials and covers an outer surface of a spherical head portion of the ball stud; a lower mold which is arranged below the upper mold and which has a molding surface for forming a portion of the ball seat; a fixing jig for fixing the ball stud at the molding location of the upper mold and the lower mold; and a rotating member for rotating the fixing jig.

The invention relates to the field of traditional Chinese medicine extracts, in particular to a method for extracting ellagic acid and chebulic acid from fructus chebulaeand a composition of the method. The method comprises the following steps: pretreating, crushing and sieving the fructus chebulae; refluxing and extracting the crushed fructus chebulae, and then treating the extract through a microporous filter membrane to obtain a solid A and an extracting solution A; refluxing and extracting the solid A, and treating the extract through a microporous filter membrane to obtain a solid B and an extracting solution B; mixing the extracting solution A with the extracting solution B, concentrating, treating through macroporous adsorption resin, eluting with a solvent, crystallizing and dryingto obtain the ellagic acid and chebulic acid from the fructus chebulae. The extracting method can extract the ellagic acid and the chebulic acid in the fructus chebulae in a targeted manner, and thecontent purity of the ellagic acid and the chebulic acid is high. The invention also provides a product with positive effects on treatment of hypertension and hyperlipidemia, and the product also haseffects of diminishing inflammation and improving eyesight.

The invention belongs to the field of healthcare medicines, and particularly relates to a health-maintaining preparation made of pure traditional Chinese medicines. The health-maintaining preparation is characterized by comprising, by weight, from 10 to 20 parts of American ginseng, from 7 to 12 parts of saffron crocus, from 30 to 40 parts of radix puerariae, from 30 to 40 parts of fructus lycii, from 25 to 35 parts of hawthorn, from 30 to 40 parts of rhizoma polygonati, from 20 to 30 parts of bee pollen, from 15 to 25 parts of honeysuckles, from 30 to 40 parts of finger citron, from 20 to 30 parts of polygonatum odoratum, from 25 to 35 parts of cortex lycii radicis, from 22 to 32 parts of prepared radix rehmanniae, from 35 to 45 parts of Chinese yams, from 30 to 40 parts of poria cocos and from 25 to 35 parts of rhizoma alismatis. The health-maintaining preparation made of the pure traditional Chinese medicines is remarkable in effect and applicable to treating people in sub-health states or with chronic diseases.

The invention provides a method for disc loading of optical thin sheet devices. A ground glass slab with small flatness errors is used as a standard used before disc loading of the optical thin sheetdevices, the upper surfaces of the multiple fixed optical thin sheet devices are located on one plane, the problem that the surfaces of the optical thin sheet devices are uneven is solved, the follow-up grinding time is shortened, and the follow-up grinding difficulty is reduced. In addition, as the upper surfaces of the multiple fixed optical thin sheet devices are on one plane, the workblank thickness, increased by the uneven upper surfaces of the multiple fixed optical thin sheet devices, of the optical thin sheet devices is saved, and raw material cost is saved. Meanwhile, low-melting-point hot melt adhesive is used in the method, the heat stress of the optical thin sheet devices and the contractility of a bonding material are reduced, deformation of the optical thin sheet devices after machining and unloading is reduced, and the machining quality and the product yield are improved.

The invention discloses a sliver paste for lead-free environment-friendly solar photovoltaic cells and a preparation method of the silver paste. The silver paste is made of paste A and paste B by means of mixing in equal proportion and ball milling. The prepared silver paste is free of lead and low in damage to a human body and the environment and completely meets the requirement on environment protection. Silver powder of equal particle diameters and other conductive particles are selected for filling clearances of the sliver powder, so that the stacking density of a coating is improved, the contact area among the particles is widened, the shrinkage force of the coating is reduced, and the conductivity of the silver paste is improved. Since aluminum powder and copper powder are added into the conductive paste, production cost of the silver paste can be reduced while conductivity of the silver paste is improved. Consequently, manufacturing cost of solar cells is reduced, and high economic benefit is achieved.

The invention discloses a novel application of a traditional Chinese medicine extract product-Arctigenin in preparation of anti-arrhythmia medicines. A research found that the Arctigenin has bidirectional anti-arrhythmia effect and can adjust arrhythmia caused by aconitine and ouabain. Arctigenin has an effect for reducing ventricular muscle contraction force. A pharmacological effect of the Arctigenin is bidirectional adjusted cardiac muscle cell inner calcium current, the cardiac muscle cell inner potassium current is increased, and the sodium current is inhibited. The invention shows that the Arctigenin has anti-arrhythmia effect, and especially has bidirectional adjusting on arrhythmia, the side-effect is smaller, the Arctigenin has application prospect for treating toxic arrhythmia and ischemic-reperfusion arrhythmia in aconitine and ouabain; and the Arctigenin with myocardial contractility reduction effect can be taken as an auxiliary treatment measurement for hypertensive disease.

The invention discloses a silver paste for an environmental-friendly lead-free silicon solar cell front electrode and a preparation method of the silver paste. The aluminum powder mixed silver paste is prepared from a slurry A and a slurry B through mixing and ball-grinding at an equal proportion. The silver paste prepared by adopting the preparation method does not contain lead, is little in damage to a human body and an environment, and completely accords with the requirement of environmental friendliness. According to the invention, silver powder with same particle diameter and other conductive particles are selected to be filled in gaps among the silver powder, thus the packing density of a membrane layer is increased, the contact area among the particles is increased, and the contraction force of the membrane layer is lowered, thus the conduction capacity of the silver paste is increased. According to the invention, copper powder and aluminum powder are added in the silver paste, thus the production cost of the silver paste is favorably lowered, and the conduction property of the silver paste is improved, therefore, the purpose of reducing manufacture cost of a solar cell is achieved, and a better economic benefit is obtained.

The invention relates to the technical field of leather making chemistry and engineering and provides a finishing method for improving the lamination degree of a coating and crust leather. According to the finishing method, non-ionic polyurethane resin without charges and a non-ionic oil wax auxiliary agent are selected as main body materials of a finishing agent; the surface tension of a finishing agent is reduced so that the leveling property and the permeability are improved; a technology is balanced and primary and secondary aspects in each phase and each operation are grasped; the lamination degree of the coating and the crust leather is improved; an ideal thin film is formed on the surface of the crust leather through the finishing agent and a shell is not easy to form after the coating is repeatedly bent or stretched; the non-ionic oil wax auxiliary agent has good filling and covering effects and can be used for improving the flatness and fineness of a particle surface of the crust leather; injuries on the particle surface of the crust leather are covered; the grading rate and utilization rate of the crust leather are improved.

The invention discloses an energy-storage self-luminous epoxy resin mixture for roads as well as a preparation method and application thereof. The energy-storage self-luminous epoxy resin mixture comprises the following components: coarse aggregate, fine aggregate, epoxy resin, a toughening agent, a curing agent and fluorescent powder, wherein the nominal particle size of the coarse aggregate is greater than 2.36 mm, the nominal particle size of the fine aggregate is 0.15-2.36 mm, and the nominal particle size of the fluorescent powder is less than 0.15 mm; wherein the epoxy resin accounts for6.0%-10.0% of the total mass of the coarse aggregate and the fine aggregate, the flexibilizer accounts for 0.4%-1.0% of the total mass of the coarse aggregate and the fine aggregate, the curing agentaccounts for 1.0%-2.5% of the total mass of the coarse aggregate and the fine aggregate, and the fluorescent powder accounts for 5.0%-10.0% of the total mass of the coarse aggregate and the fine aggregate. The advantages of the fluorescent powder are achieved by applying the colorless and transparent epoxy resin, so that the epoxy resin mixture is good in light transmission and ideal in luminouseffect, and the proportion of the epoxy resin can meet the requirement of pavement performance and has a protection effect on the fluorescent powder; the fluorescent powder with the nominal particle size smaller than 0.15 mm is adopted for replacing fine aggregate with the particle size smaller than 0.15 mm, so that the mechanical property of the pavement structure is not affected, and the beneficial effects of energy storage and light emitting are achieved.

The invention discloses an anti-electrostatic material used in an ultrahigh voltage environment and a preparation method of the anti-electrostatic material. The anti-electrostatic material comprises the following raw materials in percentage by mass: 12.0-12.15% of an epoxy resin E44, 17.`5-`7.35% of an epoxy resin E51, 3.98-4.08% of a quaternary ammonium salt anti-electrostatic agent, 4.06-4.26% of polyamide 350A, 6.95-7.15% of zinc oxide, 4.20-4.40% of aluminum powder, 9.40-9.60% of titanium dioxide, 1.70-1.90% of tin oxide, 4.10-4.30% of calcium carbonate, 5.20-5.40% of conductive powder BC-C, 2.70-2.90% of fluosilicate, 2.0-2.2% of fumed silica, 17.93-18.13% of magnesium titanate, 4.15-4.35% of 1,4-butanediol diglycidyl ether and 3.08-3.28% of a silane coupling agent KH560. The anti-electrostatic material is capable of not only isolating sensitive charges of metallic components, but also effectively preventing the metallic components from oxidation, has a function of preventing ionization dust adhesion, and has good application and development prospects.

The invention discloses a preparation method and application of a back electrode of a solar cell, which comprises two parts, a back electrode barrier layer and a back silver paste. 20 to 80 part of metal nitride powder, nitrogen-silicon compound powder, oxide powder or low-melting-point metal powder, 0.5 to 5 parts of lead-free glass powder, 10 to 40 parts of organic carrier and 0.1 to 1 part of organic assistant. 10-80 part of silver powder, 0. 5-5 parts of lead-free glass powder, 15-50 parts of organic bind and 0. 01-1 part of organic assistant. The present invention ensures that it has considerable welding pulling force and aging pulling force, avoids serious electric leakage problem caused by metal defects caused by direct contact between silver and silicon wafer or aluminum paste, improves photoelectric conversion efficiency of crystalline silicon battery, adjusts back electrode width and printed pattern, and reduces back electrode paste cost.