Preparation method of nanometer low-silver-content back silver conductor paste for crystalline silicon solar application
A technology of conductive paste and solar energy, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, electrical components, etc., and can solve problems such as poor printing performance, affecting electrical conductivity, and large paste fineness, etc. Problems, to achieve the effect of improving application performance and conductivity, improving connection strength, and improving wettability
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[0029] A kind of preparation method of back silver conductor paste for nanometer low silver containing crystalline silicon solar energy, comprises the following steps:
[0030] Step 1, the preparation of nano-silver powder
[0031] Slowly add 0.1-1.0mmol / L silver nitrate solution and 1.0-5.0mmol / L polyvinyl alcohol PVA solution into the 10-30mmol / L sodium borohydride solution in sequence, while stirring in a water bath, the temperature is controlled at 20 -70°C, until the solution is cloudy, centrifuge, wash with ethanol, and dry under low temperature and negative pressure at 40-50°C to obtain nano-silver powder with a particle size of 10nm-100nm; silver nitrate solution, polyvinyl alcohol PVA solution The volume ratio with sodium borohydride solution is: 2:7:1. Polyvinyl alcohol PVA solution can effectively prevent the rapid combination and agglomeration of silver particles in the reaction, and can be used as a stabilizer and dispersant; sodium borohydride is very effective ...
Embodiment 1
[0047] A kind of preparation method of back silver conductor paste for nanometer low silver containing crystalline silicon solar energy, comprises the following steps:
[0048] Step 1, the preparation of nano-silver powder
[0049]Slowly add 0.75mmol / L silver nitrate solution and 3.0mmol / L polyvinyl alcohol PVA solution dropwise into 15mmol / L sodium borohydride solution in turn, and stir in a water bath at 45°C until the solution is cloudy, then centrifuge Separation, washing with ethanol, and drying at 40°C under negative pressure to obtain silver powder with a particle size of 15nm-25nm; the volume ratio of silver nitrate solution, polyvinyl alcohol PVA solution and sodium borohydride solution is 2:7 :1.
[0050] Step 2, preparation of organic carrier
[0051] Add 45g of polyester resin to 25g of n-butanol and 30g of n-hexanol, heat at a constant temperature at 70°C until completely dissolved, and filter to obtain Organic Vehicle-1; add 30g of polyurethane resin to 40g of ...
Embodiment 2
[0055] A kind of preparation method of back silver conductor paste for nanometer low silver containing crystalline silicon solar energy, comprises the following steps:
[0056] Step 1, the preparation of nano-silver powder
[0057] Slowly add 0.85mmol / L silver nitrate solution and 3.5mmol / L polyvinyl alcohol PVA solution dropwise to 15mmol / L sodium borohydride solution in turn, while stirring in a water bath at 55°C, until the solution is cloudy, perform centrifugation , wash with ethanol, and dry at 40°C under low temperature and negative pressure to obtain silver powder with a particle size of 35nm-45nm; the volume ratio of silver nitrate solution, polyvinyl alcohol PVA solution and sodium borohydride solution is 2:7:1.
[0058] Step 2, preparation of organic carrier
[0059] Add 35g of polyester resin to 35g of n-butanol and 30g of isoamyl alcohol, heat at a constant temperature at 75°C until completely dissolved, and filter to obtain Organic Vehicle-1; add 35g of acrylic ...
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