▎ 摘　　要

NOVELTY - Protective agent comprises 40-100 g octadecyl mercaptan, 4-10 g trimethyl phosphate, 100 mg reduction-oxidation graphene, 40-100 g emulsifying agent, 10 g stabilizer and balance of deionized water. USE - Used as protective agent. ADVANTAGE - The agent improves corrosion resistance and anti-tarnishing property of the protected metal, does not affect the appearance and performance of the silver plating layer, maintains the electronic product for the potassium sulfide resistance test for more than 12 minutes and improves the protection time. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the protecting agent comprising uniformly mixing octadecyl mercaptan and trimethyl phosphate at 60 degrees C to obtain agent A, then adding emulsifying agent and stabilizing agent into water, uniformly mixing at 60 degrees C to obtain agent B, uniformly mixing the agent A and agent B at 400 rotations/minute of rotating speed with lower stirring for 2-4 hours using the stirrer, then emulsifying, adding 100 mg/l reduction-oxidation graphene, ultrasonicating at 30 KHz for 6 hours using ultrasonic disperse machine and dispersing.