Is the thermos bottle sleeve plated with Ag?

I am a thermos flask maker and have been in this industry for 28 years.

The bottle is plated with sterling silver, but the material used is called "silver nitrate" in our industry.

The difference between silver nitrate and sterling silver is: the pure silver content in silver nitrate is about 67%, and professional manufacturers dissolve sterling silver with nitric acid and other chemical materials to make white crystals, so it is called "silver nitrate". Silver nitrate is made for the purpose of easy dissolution when reused.

After we procure, we use ammonia in the production process.

and other raw materials and methods, and then dissolve silver nitrate into a liquid, with the special process of the industry, plated in the bottle gall interlayer, that is, the "silver mirror reaction" in the chemistry book.

A friend's right: the purpose of silver plating is to reflect radiation; The purpose is the same as vacuuming, that is, to keep warm. A variety of means are to improve the temperature holding.

Thermos flasks, thermos flasks, only if the temperature is good, is called a thermos flask. Otherwise, it can only be called a "bottle".

As far as I know, it is currently in the country, it has been studied for many years, but so far other metals still cannot replace silver nitrate.

Due to the popularization of pure water and the acceleration of the pace of life, thermos flasks, as a cheap, clean, fragile and pollution-free traditional daily necessities, are used less and less in urban families. However, there is still a large market in rural areas, colleges and universities, and among the vast number of floating people.

In recent years, due to rare metals.

In line with international standards, silver nitrate ** soared, and the thermos bottle industry was struggling. In the production of thermos flasks, the largest cost is silver nitrate, which has exceeded 7,000 yuan at the highest.

Of course, that's another topic, hehe...

Not sterling silver; It is made by mixing with other materials.

You can refer to high school physics, in fact, the silver content of a thermos flask is not even one gram.

It should be a silver mirror reaction.

The surface of the inner tank is not coated with any substance, and the coating is on the inner wall, and now, using more advanced technology, it is not silver, but aluminum compound. The bottle is glass, like a mirror. Those suspended solids are limescale, don't worry.

Just let it sit for a while. As long as the gallbladder does not break, it will not come into contact with water, and once it breaks, it will not keep warm. That's the problem.

It's not that you can't drink water without heat preservation, and most of the time the small button at the bottom of the gall is broken so that the vacuum in the bladder is lifted, which leads to no heat preservation.

The inner liner of the water bottle is coated with silver. In this way, the heat radiation inside the thermos flask can be reflected back to the inside of the thermos flask, and there will be no external heat radiation. The key depends on where it is plated, because silver can be dissolved in Hno3, so you can use Hno3 to dissolve where the experimental silver is plated, or use physical methods, take a small wooden strip, contact with the inner and outer surfaces of the water bottle gallbladder, and observe the image of the wooden strip on the glass mirror, you can know where the silver layer is, you can use the wooden strip to do experiments on a shiny metal surface, observe carefully, and then analyze other mirrors at home, the mirror is also made of a layer of silver plated on the glass.

The inner coating of the bottle is generally silver-plated (silver mirror), which is plated by silver mirror reaction. The industrial upper plane mirror production and glass silver plating process such as thermos gall is to use reducing compounds (such as aldehydes, monosaccharides, potassium sodium tartrate, etc.) to reduce silver ammonia with ions, so that the metallic silver in it is closely arranged into silver foil and adheres to the clean glass surface to form silver.

In order to make the metallic silver evenly precipitate and firmly adhere to the mirror, in addition to treating and washing with acid and alkali to make the mirror surface clean, it is also necessary to "sensitize" the mirror surface. The reason for this is that when the mirror sodium silicate is treated with acid and alkali, part of it becomes silicic acid.

When silver is plated, the exchange rate between silver and silicic acid is slow, while the exchange rate of alkali ions in the plating solution with silicic acid is very fast, and this difference in activity affects the uniformity of the plating layer. Mirrors are usually treated with an SNCL2 solution (sensitizer) and then rinsed with distilled water before silver plating can begin on the mirrors.

More than 30 years ago, the silvery-white reflective film material was silver (AG), which was formed by the reaction of silver nitrate solvent.

The silvery-white reflective film material of the current liner is aluminum (AL), which is produced by vacuum coating.

The inner tank is pumped into a vacuum to reduce conduction heat dissipation

The inner tank is coated with a reflective film to reduce radiation and heat dissipation.

It uses the silver mirror reaction in chemistry, you can check it, and the mirror also uses this reaction!

There are only three ways to conduct thermal energy: heat transfer, heat convection, and heat radiation.

Wooden stoppers are poor conductors of heat and can hinder heat transfer.

The thermos flask is a double-layer bottle with a vacuum in the middle, which is to hinder the heat convection and lose heat energy.

Silver plating reflects heat radiation and prevents heat energy from being lost in a radiative manner.

Silver is difficult to undergo chemical reactions, and the high temperature of 100 degrees Celsius can also ensure that no harmful chemicals are produced. Plating silver on glass is simple, gilding is too expensive, and compared to porcelain and iron, it is lightweight. It may also have the effect of heat preservation, because the density of silver is large, and it is difficult for the outside temperature to alternate with the inside, and silver is pervasive.

In order to keep warm, the insulation effect of silver is good!

Well, that's what I said above