Aqueous cleaning low-temperature welding paste and preparation method thereof
A water cleaning and low temperature technology, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problems of restricted order quantity, unguaranteed welding quality of electronic components, long delivery cycle, etc., and achieve a reasonable ratio , shorten the welding time, the effect of fast welding speed
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Embodiment 1
[0035] Step 1: Solder Alloy Melting
[0036] According to the percentage by weight, 36%-44% of Pb, 18%-22% of Bi and the balance of Sn are respectively taken, and the total amount of each component is 100%, and the components are mixed and smelted to obtain an alloy;
[0037] Step 2: Solder Alloy Powder Preparation
[0038] Using the atomization method, using nitrogen as the atomizing gas, place the alloy prepared in step 1 at a pressure of 0.5MPa to 1.0MPa and a temperature of 380°C to 420°C to atomize the alloy powder, and the alloy Powder, through screening, to obtain solder alloy powder with a particle size of 25um to 50um;
[0039] Step 3: Flux Preparation
[0040] By weight percentage, take 6% malic acid, 4% hydroxyethyl cellulose, 20% dimethyl alkyl betaine, 5% hydrogenated castor oil, 55% glycerin, 10% sorbitol , the total amount of each component is 100%, add malic acid, hydroxyethyl cellulose, dimethyl alkyl betaine, hydrogenated castor oil, and sorbitol to glycer...
Embodiment 2
[0044] Step 1 and Step 2 are the same as in Example 1, except for the preparation of flux in step 3 and the preparation of solder paste in step 4.
[0045] By weight percentage, take 8% malic acid, 3% hydroxyethyl cellulose, 20% dimethyl alkyl betaine, 4% hydrogenated castor oil, 55% glycerin, 10% sorbitol , the total amount of each component is 100%. Add malic acid, hydroxyethyl cellulose, dimethyl alkyl betaine, hydrogenated castor oil, and sorbitol to glycerin, heat and stir, and mix well after being completely dissolved. Stand still to prepare soldering flux;
[0046] Step 4: Solder Paste Preparation
[0047] Take 88% of the solder alloy powder prepared in step 2 and 12% of the flux prepared in step 3 respectively in percentage by weight, and mix them evenly to obtain a water-cleaning low-temperature solder paste.
Embodiment 3
[0049] Step 1 and Step 2 are the same as in Example 1, except for the preparation of flux in step 3 and the preparation of solder paste in step 4.
[0050] Step 3: Flux Preparation
[0051] By weight percentage, take 7% malic acid, 6% hydroxyethyl cellulose, 20% dimethyl alkyl betaine, 4% hydrogenated castor oil, 55% glycerin, 8% sorbitol , the total amount of each component is 100%. Add malic acid, hydroxyethyl cellulose, dimethyl alkyl betaine, hydrogenated castor oil, and sorbitol to glycerin, heat and stir, and mix well after being completely dissolved. Stand still to prepare soldering flux;
[0052] Step 4: Solder Paste Preparation
[0053] Take 87% of the solder alloy powder prepared in step 2 and 13% of the flux prepared in step 3 respectively in percentage by weight, and mix them evenly to obtain a water-cleaning low-temperature solder paste.
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