Composition of water-based silver powder coating
A composition, silver powder technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy falling off of silver powder, poor bonding force, poor solvent resistance, etc., and achieve excellent adhesion, excellent solvent resistance, good solvent resistance, etc. The effect of adhesion
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[0023] The preparation method of waterborne silver powder coating composition provided by the present invention comprises
[0024] 1. Weigh the required water-based emulsion as required, stir at a low speed under the high-speed disperser, the speed of the disperser is 200-800r / min, weigh the required film-forming co-solvent and water, mix, and drop into the water-based emulsion.
[0025] 2. Weigh the required thickener and appropriate amount of water as required, mix the water and thickener, and add dropwise to the emulsion prepared in step 1.
[0026] 3. Weigh the required additives as required, add them to the emulsion prepared in step 2, stir for 5-10 minutes, and adjust the pH value to 7.4-8.0.
[0027] 4. Weigh the required silver paste according to the requirements, add 2-4% by weight of co-solvent, preferably ethylene glycol butyl ether, after stirring evenly, add 0.1-5% by weight of water-based wax additive and, and then disperse at high speed Stir at low speed under ...
Embodiment 1
[0039] The following examples illustrate the coatings provided by the invention and methods for their preparation.
[0040] (1) Weigh 448g of the required water-based polyurethane, stir under the disperser (SF0.4 type disperser of Wujin Bafang Machinery Factory, Changzhou, Jiangsu), the disperser speed is 400r / min, weigh 36.4g diethylene glycol ether, 33.6 g diethylene glycol butyl ether, 45.6g ethylene glycol butyl ether and 314g deionized water, after stirring evenly with a glass rod, add dropwise into the water-based polyurethane emulsion at a speed of 120ml / min, and continue to disperse for 5min to obtain emulsion B1;
[0041] (2) Weigh 20.1 g of sodium polyacrylate and 180 g of water, drop sodium polyacrylate into water and mix, then drop into emulsion B1 at a speed of 120 ml / min to obtain emulsion B2;
[0042] (3) Weighing required auxiliary agent 3.4g polyoxyethylene alkyl ether, 4.1g polysiloxane-polyether copolymer, polysiloxane-polyether copolymer emulsion 4.1g, dime...
Embodiment 2
[0048] This embodiment is used to illustrate coating provided by the present invention and preparation method thereof
[0049] Prepare T2 according to the method for embodiment 1, difference is:
[0050] Required water-based emulsion styrene. Acrylate 450g; Required film-forming solvent is 36.6g diethylene glycol ethyl ether, 36.6g diethylene glycol butyl ether, 36.6g ethylene glycol butyl ether; Required 320g to Ionized water; the required thickening solution needs to mix 12.2g of methylcellulose and 180g of water; the required additives are 3.5g of alkylphenol polyvinyl ether, 4.0g of polyether modified silicone, polysiloxane- 4.3g of polyether copolymer emulsion, 0.9g of diethanolamine solution; the required aqueous dispersion requires 20.5g of water-based silver powder, 50g of ethylene glycol butyl ether, 5.6g of dispersant polyacrylic acid derivatives, and 12.8g of water-based wax Auxiliary agent; the obtained aqueous silver powder slurry has a pH value of 7.4 and a visc...
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