CN103435854B - Organic carrier for crystalline silicon solar cell electrode paste and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of crystalline silicon solar battery electrode slurry organic carrier and preparation method thereof, by massfraction, this organic carrier comprise 5% ~ 20% organic resin, the organic solvent of 60% ~ 85%, the thixotropic agent of 1% ~ 10% and 1% ~ 10% wetting dispersing agent.Preparation method comprises the following steps: (1), by organic resin and organic solvent mixed dissolution, obtains transparent resin solution; (2) thixotropic agent and wetting dispersing agent are added in transparent resin solution mix and activate, obtain crystalline silicon solar battery electrode slurry organic carrier.Organic carrier thixotropy of the present invention is good, shear shinning successful, can print the thin gate electrode line of large ratio of height to width and printed resolution is high, and preparation method's technique is simple, easy to operate and with low cost.

Description

Organic carrier for crystalline silicon solar cell electrode paste and preparation method thereof

technical field

The invention relates to the field of crystalline silicon solar cells, in particular to an organic carrier for crystalline silicon solar cell electrode paste and a preparation method thereof.

Background technique

For crystalline silicon solar cells, in order to output the electric energy of the battery, two positive and negative electrodes must be made on the battery. The current manufacturing method of electrodes for commercial crystalline silicon solar cells is to print rear aluminum paste, rear silver paste and front silver paste respectively on the manufactured silicon wafers, and then form electrodes by co-firing once. The back aluminum, back silver and front silver pastes, which are necessary materials in the metallization process of crystalline silicon solar cells, are the key materials required for the production of crystalline silicon solar cell devices, and their performance will directly affect the performance of crystalline silicon solar cells . Electrode paste is a complex system composed of three materials: conductive powder, inorganic binder phase and organic carrier. The organic carrier is also called organic binder. Its main function is to disperse the inorganic phase of metal powder and glass powder in it. It forms a high-viscosity thixotropic paste fluid with suitable viscosity and rheological properties, which can realize screen printing. Organic vehicles are usually composed of solvents, thickeners, thixotropic agents, rheological agents and surfactants, etc., which should be conducive to the uniform dispersion of inorganic powders, and can always remain stable during production, transportation, storage and printing.

In the metallization process of crystalline silicon solar cells, the front silver paste is screen-printed to form a positive electrode pattern, and then sintered to form a close ohmic contact with the Si sheet, which plays the role of current collection and export, but the solar front electrode is printed on the silicon substrate. While the sheet surface acts as an electrode, it also shields the sun. In order to reduce the loss caused by shielding, the paste is generally required to have the ability to print fine lines below 70 μm, so that the printed grid lines have a better aspect ratio. In order to achieve high thixotropy of the slurry and obtain an electrode pattern with a large aspect ratio, a thixotropic agent is often added to the organic vehicle. In addition, a wetting and dispersing agent, a tackifier, and a defoamer are often added to the organic vehicle. The auxiliary agent makes the final slurry a pseudoplastic fluid with certain thixotropy, and makes the viscosity recovery speed of the slurry faster during the process from high shear to low shear.

However, the traditional organic vehicle only pays attention to the fluidity of the slurry, that is, the printability, but ignores the shear thinning characteristics of the slurry and the viscosity recovery after shear thinning, resulting in the preparation of the slurry in the printing of large height and width. It is difficult to use a thinner electrode grid line, and the printed film layer is easy to collapse, which makes the film layer wider and lower in height, which in turn increases the light-shielding area of the electrode grid line and affects the conversion efficiency. Therefore, it is necessary to find a new material or method to improve the dispersibility of the powder in the slurry, improve the thixotropy of the slurry and the ability to print fine electrode grid lines with a large aspect ratio while ensuring that the slurry can be screen-printed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a slurry that can make the prepared slurry have good thixotropy, good dispersibility and storage stability, obvious shear thinning effect, fast viscosity recovery, and large printing capacity. An organic carrier for crystalline silicon solar cell electrode paste with a fine aspect ratio and high printing resolution, and a method for preparing an organic carrier for crystalline silicon solar cell electrode paste with simple process, convenient operation and low cost .

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is an organic carrier for crystalline silicon solar cell electrode paste, and the organic carrier includes the following components in mass fraction:

Organic resin 5% to 20%,

Organic solvent 60%～85%,

Thixotropic agent 1% to 10%, and

Wetting and dispersing agent 1% to 10%.

Among the above organic vehicles, preferably, the organic resin includes one or more of ethyl cellulose, acrylic resin, rosin and its derivatives, and phenolic resin.

Among the above-mentioned organic carriers, preferably, the organic solvent includes 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (i.e. alcohol ester dodeca), epoxidized tall oil Fatty acid (i.e. 2-ethylhexyl ester), bis[2-(2-butoxyethoxy)ethyl adipate], butyl carbitol, butyl carbitol acetate, terpineol, One of Dipropylene Glycol Methyl Ether, Propylene Glycol Methyl Ether, Tributyl Citrate, Ethylene Glycol Phenyl Ether, Dibutyl Phthalate, Dioctyl Phthalate and Dimethyl Nylonate (DBE) or Various.

Among the above organic carriers, preferably, the thixotropic agent includes one or more of hydrogenated castor oil and its modified products, polyamide wax and its modified products.

In the above organic vehicle, the wetting and dispersing agent is an anionic surfactant and/or a nonionic surfactant, and the sum of the HLB values of the surfactants in the wetting and dispersing agent is preferably 5-14.

Among the above organic vehicles, the wetting and dispersing agent is preferably N-tallowyl-1,3-propanediamine dioleate.

As a general technical conception, the present invention also provides a method for preparing an organic carrier for crystalline silicon solar cell electrode paste, comprising the following steps:

(1) Dissolution of organic resin: by mass fraction, weigh 5% to 20% of organic resin and 60% to 85% of organic solvent to mix, then heat and stir at 50°C to 100°C until the organic resin is completely dissolved (At this time, it is a transparent liquid), and then cooled to room temperature to obtain a transparent resin solution;

(2) Activation of the thixotropic agent: by mass fraction, weigh 1% to 10% of the thixotropic agent and 1% to 10% of the wetting and dispersing agent, and add the thixotropic agent and wetting and dispersing agent into the step (1 ) into the transparent resin solution obtained, and then heat the resulting mixed solution at 50°C to 80°C, while applying shear to the mixed solution until the thixotropic agent is activated to become a transparent liquid, and then cooled to room temperature (generally 5°C ~35°C) to obtain an organic vehicle for crystalline silicon solar cell electrode paste (the organic vehicle is in the form of a solid paste at room temperature).

In the above method, preferably, the organic resin includes one or more of ethyl cellulose, acrylic resin, rosin and its derivatives, and phenolic resin; the organic solvent includes 2,2,4-trimethyl 1,3-pentanediol monoisobutyrate, epoxidized tall oil fatty acid, bis[2-(2-butoxyethoxy)ethyl adipate], butyl carbitol, Butyl carbitol acetate, terpineol, dipropylene glycol methyl ether, propylene glycol methyl ether, tributyl citrate, ethylene glycol phenyl ether, dibutyl phthalate, dioctyl phthalate, and nylon One or more of dimethyl ester (DBE).

In the above method, preferably, the thixotropic agent includes one or more of hydrogenated castor oil and its modified products, polyamide wax and its modified products.

In the above method, the wetting and dispersing agent is an anionic surfactant and/or a nonionic surfactant, and the sum of the HLB values of the surfactants in the wetting and dispersing agent is preferably 5-14.

In the present invention, the optimal amount of organic resin can be determined according to the oil absorption value of the conductive powder in the electrode slurry and the viscosity requirement of the electrode slurry, and the organic resin mainly plays the role of thickening and improving the elasticity of the slurry. Preferably, the organic resin includes high-molecular-weight resin and low-molecular-weight resin at the same time (generally limit the resin with molecular weight less than 1W as low-molecular-weight resin), high-molecular-weight resin can increase the viscosity and viscoelasticity of organic vehicle and electrode slurry, but in organic vehicle Excessive high-molecular-weight resins can easily cause electrode paste to spin and affect the screen printing performance of the electrode paste. A reasonable combination of high and low molecular weight resins is beneficial to improve the viscoelasticity of the electrode paste while avoiding string-drawing , such as the combination of high molecular weight ethyl cellulose and low molecular weight rosin and its derivatives.

The activation process of thixotropic agent is related to the type of thixotropic agent. Generally, the activation temperature of hydrogenated castor oil should be controlled below 50°C and a moderate degree of shearing should be applied, while the activation temperature of polyamide wax generally does not exceed 80°C .

The wetting and dispersing agent is mainly selected according to the hydrophilic and lipophilic properties of the silver powder and glass powder in the electrode paste.

Compared with the prior art, the present invention has the advantages of:

(1) The organic vehicle of the present invention includes high-performance components such as low-ash organic resins of different types and molecular weights, high-boiling point solvents, thixotropic agents, and wetting and dispersing agents. Conductive powder and inorganic glass powder can be realized in the organic vehicle. uniform dispersion; the crystalline silicon solar cell electrode paste prepared by the organic carrier of the present invention has good thixotropy and viscoelasticity, good storage stability, obvious shear thinning effect and fast viscosity recovery after shear thinning, and can Print large aspect ratio thin lines, high printing resolution.

(2) The organic vehicle of the present invention can effectively increase the solid content of the electrode paste and improve the rheological characteristics and process performance of the electrode paste while ensuring the screen printing performance of the electrode paste for crystalline silicon solar cells.

(3) The preparation method of the organic carrier in the present invention has the advantages of simple process, convenient operation and low cost, and the design of the thixotropic agent and its activation process can make the prepared organic carrier effectively used in the electrode slurry of crystalline silicon solar cells.

Description of drawings

Fig. 1 is the viscosity-rotational speed curve of the organic vehicle used in the electrode slurry for crystalline silicon solar cells prepared in the embodiment of the present invention.

Fig. 2 is the viscosity-shear rate curves of the positive electrode slurry of crystalline silicon solar cells in Example 1 and Example 2 of the present invention and a certain foreign model of positive electrode slurry.

Fig. 3 is the viscosity-time curve obtained through three-stage shearing experiments of the positive electrode slurry of the crystalline silicon solar cell in Example 1 of the present invention and the positive electrode slurry of a certain foreign model.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

In a specific embodiment of the present invention, the organic resin is preferably one or more of ethyl cellulose, acrylic resin, rosin and derivatives thereof, and phenolic resin;

Organic solvents are preferably 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, epoxidized tall oil fatty acid, adipate bis[2-(2-butoxyethoxy ) ethyl ester], butyl carbitol, butyl carbitol acetate, terpineol, dipropylene glycol methyl ether, propylene glycol methyl ether, tributyl citrate, ethylene glycol phenyl ether, dibutyl phthalate One or more of esters, dioctyl phthalate and dimethyl nylon acid;

Thixotropic agent is preferably one or more in hydrogenated castor oil and its modifications, polyamide wax and its modifications;

The wetting and dispersing agent is preferably anionic surfactant and/or nonionic surfactant, and the sum of HLB values is preferably 5-14.

Viscosities described in the following examples all refer to apparent viscosity.

Example 1:

An organic vehicle for crystalline silicon solar cell electrode paste of the present invention comprises the following components: 1.04g organic resin, 9.07g organic solvent, 0.5g thixotropic agent and 0.5g wetting and dispersing agent, wherein the organic resin consists of 0.187 g ethylcellulose 200, 0.053g ethylcellulose 300 and 0.8g acrylic resin NeoCryl B-723, the organic solvent is composed of 5.57g alcohol ester dodeca (that is, 2,2,4-trimethyl-1,3- Pentylene glycol monoisobutyrate) and 3.5g dimethyl nylon acid (DBE), the thixotropic agent is 0.5g polyamide wax MT ST, the wetting and dispersing agent is 0.5g N-tallow-1,3- Propylenediamine dioleate, HLB value 12.

A method for preparing an organic carrier for the above-mentioned crystalline silicon solar cell electrode paste of the present invention, comprising the following steps:

(1) Dissolution of organic resin: Weigh 0.187g of ethyl cellulose 200, 0.053g of ethyl cellulose 300 and 0.8g of acrylic resin NeoCryl B-723 as organic resin components, 5.57g of alcohol ester dodeca and 3.5g of DBE as Organic solvent, add organic resin and organic solvent into a heatable container with shearing effect and mix, heat and stir at 90°C for 2 hours until the organic resin is completely dissolved and become a transparent liquid, then cool to room temperature to obtain a transparent resin solution;

(2) Activation of thixotropic agent: Weigh 0.5g polyamide wax MT ST as thixotropic agent, 0.5g N-tallow-1,3-propanediamine dioleate as wetting and dispersing agent, and thixotropic Add additives and wetting and dispersing agents to the transparent resin solution obtained in step (1), and heat the resulting mixed solution. The heating temperature is controlled at 60°C, and at the same time, a medium-strength shearing action (rotating speed: 1000rpm) is applied to the mixed solution to maintain Shearing for 30 minutes until the thixotropic agent is fully activated to become a transparent liquid, and then cooled to room temperature to obtain a light yellow paste-like organic vehicle for crystalline silicon solar cell electrode paste.

Measure the apparent viscosity of the organic carrier prepared in this example above at a temperature of 25°C and at different rotational speeds. The apparent viscosity is tested with a Brookfield HBDV-II viscometer, and the SC4-14/6R small sample test rotor is used. The obtained viscosity-speed curve is shown in Fig. 1. It can be seen from the figure that the organic vehicle is a pseudoplastic fluid with obvious shear thinning characteristics, and the viscosities at 1rpm and 10rpm are 590Pa·s and 120Pa·s, respectively.

The organic vehicle prepared in this example above is used to prepare the positive electrode slurry for crystalline silicon solar cells, wherein the quality of the organic vehicle is 9.3g, the quality of the silver powder is 88.2g, and the quality of the glass powder is 2.5g, and the glass powder and the silver powder are added respectively In the organic carrier, after uniform stirring, the agglomerated powder is pulled apart by the shearing action of a three-roll machine to obtain a crystalline silicon solar cell positive electrode slurry with a fineness of less than 10 μm.

Anton Paar rheometer was used to characterize the rheological properties of the anode slurry for crystalline silicon solar cells. The obtained viscosity-shear rate curve of the anode slurry for crystalline silicon solar cells is shown in Figure 2. It can be seen from the figure that the The viscosity ^- shear rate curve of the crystalline silicon solar cell electrode slurry prepared by the organic vehicle is composed of three sections. When the shear rate is less than 0.1S There is a plateau in the range of 0.1 to 1S ^-1 in the change of shear rate, and after the plateau, as the shear rate continues to increase, the viscosity of the slurry will decrease linearly. According to the Brookfield HBDV-II viscometer, the apparent viscosity of the anode slurry for the crystalline silicon solar cell is 229 Pa·s at 10 rpm. The viscosity-shear rate curve of a certain type of positive electrode slurry abroad is shown in Figure 2. The shape of the viscosity-shear rate curve of the positive electrode slurry prepared in this example is similar to that of foreign positive electrode slurry, but the viscosity is slightly higher than that of foreign positive electrode slurry , the viscosities of the positive electrode slurry prepared in this example at 0.4S ^-1 and 4S ^-1 are 2380Pa·s and 284Pa·s respectively, and the foreign positive electrode slurry are 1760Pa·s and 213Pa·s respectively.

A three ^- stage shear test ( ^3ITT ) was carried out on the positive electrode slurry of the above ^- mentioned crystalline silicon solar cell. The recovery of viscosity after 500s ^-1 high shear, the obtained viscosity-time curve is shown in Figure 3, as can be seen from the figure, the viscosity recovery degree of the above-mentioned crystalline silicon solar cell cathode slurry within 1 second after high shear is 22.6% ( Divide the viscosity value at the first point of the third section 1S ^-1 by the average viscosity value of the last five points under the first section 1S ^-1 ). The viscosity-time curve of the foreign positive electrode slurry (the same model as the aforementioned foreign positive electrode slurry) is shown in Figure 3. Compared with the foreign positive electrode slurry, the positive electrode slurry prepared in this example has a faster Viscosity recovery speed, this fast structure or viscosity recovery speed is conducive to the acquisition of fine lines with large aspect ratio for screen printing.

In addition, it can be seen from tests that the fineness of the cathode slurry for crystalline silicon solar cells prepared in this example is <10 μm, the storage stability is >6 months, and the printing resolution is 50 μm.

Example 2:

An organic vehicle for crystalline silicon solar cell electrode paste of the present invention comprises the following components: 2.86g organic resin, 15.103g organic solvent, 1.0g thixotropic agent and 0.5g wetting and dispersing agent, wherein the organic resin consists of 0.28 g ethyl cellulose 200, 0.08 g ethyl cellulose 300 and 2.5 g acrylic resin NeoCryl B-842, the organic solvent is composed of 8.355 g alcohol ester twelve and 6.748 g DBE, the thixotropic agent is 1.0 g polyamide wax MT ST, wetting and dispersing agent is 0.5g N-tallow-1,3-propanediamine dioleate, HLB value is 12.

A method for preparing an organic carrier for the above-mentioned crystalline silicon solar cell electrode paste of the present invention, comprising the following steps:

(1) Dissolution of organic resin: Weigh 0.28g of ethyl cellulose 200, 0.08g of ethyl cellulose 300 and 2.5g of acrylic resin NeoCryl B-842 as organic resin components, 8.355g of alcohol ester dodeca and 6.748g of DBE as Organic solvent, add organic resin and organic solvent into a heatable container with shearing effect and mix, heat and stir at 90°C for 2 hours until the organic resin is completely dissolved and become a transparent liquid, then cool to room temperature to obtain a transparent resin solution;

(2) Activation of thixotropic agent: Weigh 1.0g polyamide wax MT ST as thixotropic agent, 0.5g N-tallow-1,3-propanediamine dioleate as wetting and dispersing agent, and thixotropic Add the wetting and dispersing agent and the wetting and dispersing agent to the transparent resin solution obtained in step (1), and heat the resulting mixed solution at a temperature of 60°C. At the same time, a medium-intensity (1000rpm) shear is applied to the mixed solution to maintain the shear Act for 30 minutes until the thixotropic agent is fully activated to become a transparent liquid, and then cooled to room temperature to obtain a light yellow paste-like organic vehicle for crystalline silicon solar cell electrode paste.

The apparent viscosity of the organic vehicle prepared in this example above was measured at a temperature of 25° C. at different rotational speeds, and the obtained viscosity-rotational speed curve is shown in FIG. 1 . It can be seen from the figure that the organic vehicle is a pseudoplastic fluid with obvious shear thinning characteristics, and the viscosities at 1 rpm and 10 rpm are 300 Pa·s and 84 Pa·s, respectively.

The organic vehicle prepared in this example above is used to prepare the positive electrode slurry for crystalline silicon solar cells, wherein the quality of the organic vehicle is 9.3g, the quality of the silver powder is 88.2g, and the quality of the glass powder is 2.5g, and the glass powder and the silver powder are added respectively In the organic carrier, after uniform stirring, the agglomerated powder is pulled apart by the shearing action of a three-roller machine to obtain a positive electrode slurry for a crystalline silicon solar cell.

Anton Paar rheometer was used to characterize the rheological properties of the above-mentioned crystalline silicon solar cell positive electrode slurry, and the obtained viscosity-shear rate curve of the crystalline silicon solar cell positive electrode slurry is shown in Figure 2. It can be seen from the figure that this The shape of the viscosity-shear rate curve of the positive electrode slurry prepared in the example is similar to that of foreign positive electrode slurry, and the viscosity is basically equivalent to that of foreign positive electrode slurry. The viscosities of the prepared positive electrode slurry at 0.4S ^-1 and 4S ^-1 are respectively 2260Pa s and 236Pa s, foreign positive electrode slurry is 1760Pa s and 213Pa s respectively. It is found through testing that the apparent viscosity of the anode slurry for crystalline silicon solar cells prepared in this embodiment is 210 Pa·s at 10 rpm.

It can be seen from the test that the above-mentioned crystalline silicon solar cell positive electrode slurry has a viscosity recovery degree of 20.9% within 1 second after high shearing, a fineness of <10 μm, a storage stability of >6 months, and a printing resolution of 50 μm.

Example 3:

An organic vehicle for crystalline silicon solar cell electrode paste of the present invention comprises the following components: 2.86g organic resin, 17.488g organic solvent, 1.0g thixotropic agent and 0.5g wetting and dispersing agent, wherein the organic resin consists of 0.28 g ethyl cellulose 200, 0.08 g ethyl cellulose 300 and 2.5 g acrylic resin NeoCryl B-805, the organic solvent is composed of 10.74 g alcohol ester twelve and 6.748 g DBE, the thixotropic agent is 1.0 g polyamide wax MT ST, wetting and dispersing agent is 0.5g N-tallow-1,3-propanediamine dioleate, HLB value is 12.

A method for preparing an organic carrier for the above-mentioned crystalline silicon solar cell electrode paste of the present invention, comprising the following steps:

(1) Dissolution of organic resin: Weigh 0.28g of ethyl cellulose 200, 0.08g of ethyl cellulose 300 and 2.5g of acrylic resin NeoCryl B-805 as organic resin components, 10.74g of alcohol ester dodeca and 6.748g of DBE as Organic solvent, add organic resin and organic solvent into a heatable container with shearing effect and mix, heat and stir at 90°C for 2 hours until the organic resin is completely dissolved and become a transparent liquid, then cool to room temperature to obtain a transparent resin solution;

(2) Activation of thixotropic agent: Weigh 1.0g polyamide wax MT ST as thixotropic agent, 0.5g N-tallow-1,3-propanediamine dioleate as wetting and dispersing agent, and thixotropic Add the wetting and dispersing agent and the wetting and dispersing agent to the transparent resin solution obtained in step (1), and heat the resulting mixed solution at a temperature of 60°C. At the same time, a medium-intensity (1000rpm) shear is applied to the mixed solution to maintain the shear Act for 30 minutes until the thixotropic agent is fully activated to become a transparent liquid, and then cooled to room temperature to obtain a light yellow paste-like organic vehicle for crystalline silicon solar cell electrode paste.

The apparent viscosity of the organic vehicle prepared in this example above was measured at a temperature of 25° C. at different rotational speeds, and the obtained viscosity-rotational speed curve is shown in FIG. 1 . It can be seen from the figure that the organic carrier is a pseudoplastic fluid with obvious shear thinning characteristics, and the viscosities at 1 rpm and 10 rpm are 680 Pa·s and 58 Pa·s, respectively.

The organic vehicle prepared in this example above is used to prepare the positive electrode slurry for crystalline silicon solar cells, wherein the quality of the organic vehicle is 9.3g, the quality of the silver powder is 88.2g, and the quality of the glass powder is 2.5g, and the glass powder and the silver powder are added respectively In the organic carrier, after uniform stirring, the agglomerated powder is pulled apart by the shearing action of a three-roller machine to obtain a positive electrode slurry for a crystalline silicon solar cell.

It can be seen from the test that the above-mentioned crystalline silicon solar cell positive electrode slurry has an apparent viscosity of 259 Pa s at 10 rpm measured by a Brookfield HBDV-II viscometer, and the degree of viscosity recovery within 1 second after high shear is 27.1%. <10μm, storage stability >6 months, printing resolution is 50μm.

Example 4:

An organic vehicle for crystalline silicon solar cell electrode paste of the present invention comprises the following components: 3.5g organic resin, 18.14g organic solvent, 1.0g thixotropic agent and 1.0g wetting and dispersing agent, wherein the organic resin consists of 1.0 g ethyl cellulose 200 and 2.5 g rosin pentaerythritol ester, the organic solvent consists of 11.14 g alcohol ester dodeca and 7.0 g DBE, the thixotropic agent is 1.0 g hydrogenated castor oil, and the wetting and dispersing agent is 1.0 g N-tallow base -1,3-Propanediamine dioleate, HLB value is 12.

A method for preparing an organic carrier for the above-mentioned crystalline silicon solar cell electrode paste of the present invention, comprising the following steps:

(1) Dissolution of organic resin: Weigh 1.0g ethyl cellulose 200 and 2.5g rosin pentaerythritol ester as organic resin components, 11.14g alcohol ester dodecane and 7.0g DBE as organic solvent, add organic resin and organic solvent into the belt In a heatable container with shearing effect, heat and stir at 90°C for 2 hours until the organic resin is completely dissolved and becomes a transparent liquid, then cool to room temperature to obtain a transparent resin solution;

(2) Activation of thixotropic agent: Weigh 1.0g hydrogenated castor oil as thixotropic agent, 1.0g N-tallow-1,3-propanediamine dioleate as wetting and dispersing agent, mix thixotropic agent and Wetting and dispersing agent is added to the transparent resin solution obtained in step (1) and mixed, and the resulting mixed solution is heated, and the heating temperature is controlled at 50°C. At the same time, a medium-intensity (1000rpm) shearing action is applied to the mixed solution to maintain the shearing action 40min until the thixotropic agent is fully activated to become a transparent liquid, and then cooled to room temperature to obtain a light yellow paste-like organic vehicle for crystalline silicon solar cell electrode paste.

The apparent viscosity of the organic vehicle prepared in this example above was measured at a temperature of 25° C. at different rotational speeds, and the obtained viscosity-rotational speed curve is shown in FIG. 1 . It can be seen from the figure that the organic vehicle is also a pseudoplastic fluid with obvious shear thinning characteristics, and the viscosities at 1 rpm and 10 rpm are 360 Pa·s and 45 Pa·s, respectively.

The organic vehicle prepared in this example above is used to prepare the positive electrode slurry for crystalline silicon solar cells, wherein the quality of the organic vehicle is 9.3g, the quality of the silver powder is 88.2g, and the quality of the glass powder is 2.5g, and the glass powder and the silver powder are added respectively In the organic carrier, after uniform stirring, the agglomerated powder is pulled apart by the shearing action of a three-roller machine to obtain a positive electrode slurry for a crystalline silicon solar cell.

It can be seen from the test that the above-mentioned crystalline silicon solar cell positive electrode slurry is tested with a Brookfield HBDV-II viscometer to obtain an apparent viscosity of 254Pa·s at 10rpm), and the degree of viscosity recovery within 1s after high shear is 25.5%, and the fineness <10μm, storage stability >6 months, printing resolution is 50μm.

The above descriptions are only preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above examples. All technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims (7)

1. a crystalline silicon solar battery electrode slurry organic carrier, is characterized in that, described organic carrier comprises the component of following massfraction:

Organic resin 13.1% ~ 20%,

Organic solvent 60% ~ 80%,

Thixotropic agent 4.6% ~ 10%, and

Wetting dispersing agent 1% ~ 10%;

Described organic resin comprise in ethyl cellulose, acrylic resin, rosin and derivative thereof, resol one or more;

Described wetting dispersing agent is anion surfactant and/or nonionogenic tenside, and in described wetting dispersing agent, surfactant HLB value adds and be 5 ~ 14.

2. crystalline silicon solar battery electrode slurry organic carrier according to claim 1, it is characterized in that, described organic solvent comprises 2,2, one or more in 4-trimethylammonium-1,3-pentanediol mono isobutyrate, epoxidized tall oil lipid acid, hexanodioic acid two [2-(2-Butoxyethoxy) ethyl ester], diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetic ester, Terpineol 350, dipropylene glycol methyl ether, propylene glycol monomethyl ether, tributyl citrate, ethylene glycol phenyl ether, dibutyl phthalate, dioctyl phthalate (DOP) and nylon acid dimethyl ester.

3. crystalline silicon solar battery electrode slurry organic carrier according to claim 1, is characterized in that, described thixotropic agent comprise in hydrogenated castor oil and modifier, polyamide wax and modifier thereof one or more.

4. crystalline silicon solar battery electrode slurry organic carrier according to claim 1, is characterized in that, described wetting dispersing agent is N-tallow base-1,3-propylene diamine two oleate.

5. a preparation method for crystalline silicon solar battery electrode slurry organic carrier, comprises the following steps:

(1) dissolving of organic resin: by massfraction, take the organic resin of 13.1% ~ 20% and the organic solvent of 60% ~ 80% mixes, then at 50 DEG C ~ 100 DEG C, heated and stirred is dissolved completely to organic resin, then is cooled to room temperature, obtains transparent resin solution;

(2) activation of thixotropic agent: by massfraction, take the thixotropic agent of 4.6% ~ 10% and the wetting dispersing agent of 1% ~ 10%, thixotropic agent and wetting dispersing agent are added in the transparent resin solution that step (1) obtains, then at 50 DEG C ~ 80 DEG C, gained mixed solution is heated, apply shearing action to mixed solution simultaneously, until thixotropic agent activation becomes transparent liquid, then be cooled to room temperature, obtain crystalline silicon solar battery electrode slurry organic carrier;

Described organic resin comprise in ethyl cellulose, acrylic resin, rosin and derivative thereof, resol one or more;

Described wetting dispersing agent is anion surfactant and/or nonionogenic tenside, and in described wetting dispersing agent, surfactant HLB value adds and be 5 ~ 14.

6. preparation method according to claim 5, it is characterized in that, described organic solvent comprises 2,2, one or more in 4-trimethylammonium-1,3-pentanediol mono isobutyrate, epoxidized tall oil lipid acid, hexanodioic acid two [2-(2-Butoxyethoxy) ethyl ester], diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetic ester, Terpineol 350, dipropylene glycol methyl ether, propylene glycol monomethyl ether, tributyl citrate, ethylene glycol phenyl ether, dibutyl phthalate, dioctyl phthalate (DOP) and nylon acid dimethyl ester.

7. preparation method according to claim 5, is characterized in that, described thixotropic agent comprise in hydrogenated castor oil and modifier, polyamide wax and modifier thereof one or more.