Binding agent, organic carrier, front conductive silver paste, preparation method of front conductive silver paste and solar cell
A technology of conductive silver paste and organic carrier, which is applied in the field of solar cells to achieve excellent moisture retention, excellent linear flatness, and improved compatibility
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[0096] like figure 1 As shown, the fourth object of the present invention is to provide a preparation method of a solar cell front conductive silver paste, comprising:
[0097] Preparation of pasty glass intermediate: mixing glass powder and first organic carrier V1 in a certain proportion, grinding and dispersing, to prepare pasty glass intermediate.
[0098] The paste glass intermediate, the first silver powder P1, the second silver powder P2, the second organic carrier V2, the organic additives, etc. are mixed and stirred according to the proportions, and the front silver paste is obtained by grinding, dispersing and filtering.
[0099] Preferably, the grinding and dispersing is carried out by using a three-roll machine for several times, until the fineness of the front conductive silver paste is less than 5 μm, and the viscosity is 70-90 Pa.s. For example, the fineness of the front conductive silver paste is 4 μm and the viscosity is 80 pa.s.
[0100] The invention uses ...
Example Embodiment
[0105] Example 1
[0106] A high-efficiency solar cell front conductive silver paste suitable for ultra-fine line printing, the silver paste is composed of: 51wt% of P1 silver powder; 38wt% of P2 silver powder; 2.3wt% of glass powder; 4.1wt% of a first organic carrier V1; 3.6 wt% of the second organic vehicle V2; 1 wt% of an organic additive.
[0107] In the specific embodiment, the raw material ratio of the first organic carrier V1 is: polyvinyl butyral (PVB) 2.2wt%, copolymerization modified PVP resin 3.7wt%, cellulose acetate butyrate (CAB) 1.4wt%, modified 1.5wt% of acrylic resin, 28wt% of butyl carbitol, 48.2wt% of butyl carbitol acetate, 7.5wt% of propylene glycol butyl ether, and 7.5wt% of alcohol ester twelve.
[0108] In the specific embodiment, the raw material ratio of the second organic carrier V2 is: polyamide wax 4.2wt%, poly-alpha methyl styrene 3.5wt%, butyl carbitol acetate 32.3wt%, tripropylene glycol methyl ether 50wt%, Dimethyl adipate 10wt%.
[0109] In...
Example Embodiment
[0112] Example 2
[0113] A high-efficiency solar cell front conductive silver paste suitable for ultra-fine line printing, the silver paste is composed of: 51wt% of P1 silver powder; 38wt% of P2 silver powder; 2.3wt% of glass powder; 5.1wt% of a first organic carrier V1; 2.6 wt% of the second organic vehicle V2; 1 wt% of an organic additive.
[0114] In the specific embodiment, the raw material ratio of the first organic carrier V1 is: polyvinyl butyral (PVB) 2.2wt%, copolymerization modified PVP resin 3.7wt%, cellulose acetate butyrate (CAB) 1.4wt%, modified 1.5wt% of acrylic resin, 28wt% of butyl carbitol, 48.2wt% of butyl carbitol acetate, 7.5wt% of propylene glycol butyl ether, and 7.5wt% of alcohol ester twelve.
[0115] In the specific embodiment, the raw material ratio of the second organic carrier V2 is: polyamide wax 4.2wt%, poly-alpha methyl styrene 3.5wt%, butyl carbitol acetate 32.3wt%, tripropylene glycol methyl ether 50wt%, Dimethyl adipate 10wt%.
[0116] Th...
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