Mirror-surface nanometer spraying solution and spraying method

Abstract

A mirror-surface nanometer spraying solution and a spraying method are disclosed. The spraying solution comprises following three separated solutions: an A solution containing silver nitrate, a B solution containing glucose and an S solution containing sodium hydroxide, wherein the mass ratio of the sodium hydroxide to the silver nitrate in the A solution is 0.5-6:1. The spraying method is to separately spray the three solutions at the same time by adopting three spraying guns. The sodium hydroxide solution used for adjusting the pH value is not added into the A solution or the B solution, thus guaranteeing the lifetime and stability of the A solution and the B solution. The concentration of the sodium hydroxide is 2-6 times of the sodium hydroxide concentration in the prior art, thus largely increasing the speed of the silver mirror reaction, increasing the reduction efficiency and reducing the production cost. At a low temperature of 0 DEG C, the reaction speed can be high, and a silver layer is bright and white and free of fog. Normal production can be performed at 0-40 DEG C without the use of thermostatic equipment and silver layers with high quality can be deposited. The silver layers can be sprayed for many times and can be thick. The spraying solution and the spraying method are suitable for spraying of oversized workpieces.

Description

technical field [0001] The invention belongs to the technical field of surface spraying, in particular, the invention relates to a mirror nano-spraying solution and a spraying method using a three-head spray gun. Background technique [0002] The existing mirror surface nano-plating technology uses a double-headed spray gun to simultaneously spray liquid A containing silver nitrate or silver sulfate and liquid B containing reducing agents such as glucose or acetaldehyde to the surface of the workpiece to perform silver mirror reaction. As we all know, nano-plating needs to be under alkaline conditions in order to have a normal silver mirror reaction at room temperature, so sodium hydroxide is essential. In the existing nano-plating technology, sodium hydroxide for adjusting alkalinity must be added to agent A or agent B, and the amount of sodium hydroxide added is relatively low, so the following defects are caused: [0003] 1. The potion life is short and unstable. [000...

AI Technical Summary

Problems solved by technology

If sodium hydroxide is added to agent B, reducing agents such as glucose or acetaldehyde will decompose and become unstable in a strong alkaline environment, and reducing agents such as hydrazine hydrate will react with sodium hydroxide, and the potion will fail after a long time

[0005] 2. The reaction speed is slow, the reduction rate is low, and the cost is high

[0006] Since sodium hydroxide will affect the life and stability of agent A or agent B, in the existing double-head nanospraying technology, the content of sodium hydroxide is generally lower, and the lower the concentration of alkali, the lower the silver mirror reaction. The slower, the lower the reduction rate, resulting in higher costs

[0007] 3. The low temperature cannot produce normally, and it depends on constant temperature equipment

[0008] Due to the relatively low content of sodium hydroxide, the reaction speed of the silver mirror is slower at low temperature (0-15°C), and the deposited silver layer is yellow, black and foggy, with poor adhesion, and it is impossible to produce good quality silver mirrors at all. layer, so many have to rely on constant temperature equipment to control the temperature above 20°C in order to produce normally

[0009] 4. It is easy to fog, the silver layer cannot be sprayed too much, it cannot be sprayed thickly, and it cannot be sprayed on super large workpieces

Therefore, it is impossible to spray oversized workpieces