Chemical frosted glass is a kind of acid-etched glass, which is similar to chemical etching and chemical polishing.

The difference is that chemical polishing does not allow the acid and glass after the chemical corrosion of some insoluble reactants adhere to the surface of glass, try to dissolve and wash away, chemical polishing process is always the whole surface uniform erosion process, while the chemical frosting did not remove the insoluble substance of the chemical reaction, it adhered to the surface of the glass, and as the reaction time continued, the reactants accumulated into granular crystals and adhered to the surface firmly, the surface to which the reactants adhere hinders the further reaction of acid etching, that is to say, it becomes non-uniform erosion, resulting in a semitransparent rough surface, which scatters the incident light in a semitransparent state and has a hazy feeling, it is called frosted sand.

01 Frosting characteristics

Sand coating is a chemical erosion process, and the insoluble reactants are formed into small crystals which adhere firmly to the glass surface, erosion is also different, and make the surface uneven, belong to the surface chemical treatment. By controlling the size and number of crystals attached to the glass surface, the rough or fine rough surface can be obtained

02 Judgment of degree of frosting

Scattering rate

The higher the scattering rate of glass surface is, the higher the degree of glass frosting is.

Total transmittance

Besides scattering, reflection and absorption of incident light, the rest of the glass is transmission, and the absorption rate of the colorless glass to visible light is relatively small, and the colorless transparent glass of the same species and composition has the same thickness, the total transmissivity of the glass before sanding is almost constant under visible light, so the total transmissivity can be used to approximate the size of the glass scattering index, that is, the lower the total transmissivity, the greater the degree of sanding of the glass.

Surface morphology

It mainly refers to the size and distribution of corrosion products on the surface of glass after etching, which not only affects the total transmittance, but also affects the fineness of the surface. If the particle size distribution of the erosion products is sparse, the total permeability is higher, and if the particle size distribution of the erosion products is dense, the total permeability is low.

03 Sand coating method and chemical erosion material

1) sanding method

Immersion method

The glass product is immersed in the frosting solution for a certain time

Spray method

Spray the frosting onto the glass surface

Coating method

Apply the mastic to the glass surface

2) chemical attack materials

Frosting fluid

A liquid prepared from hydrofluoric acid and additives.

Frosted powder

The powder prepared by fluoride and its additives, when used with sulfuric acid or hydrochloric acid to produce hydrofluoric acid, essentially should belong to the category of sand-covered liquid.

Mascara

A paste prepared by adding acid to fluoride or hydrofluoric acid to an additive.

Note: If the hydrofluoric acid ratio is good, the effect is possible, the time needed for frosting is shorter than frosting paste, frosting powder. However, hydrofluoric acid is not suitable for large-scale production, especially in hot weather, its operation is extremely unstable, volatile in the air to cause atmospheric pollution. And the harm of hydrofluoric acid to human body is greater, can corrode human skin and bone, belong to a gradually eliminated method of frosting.

Frosting Cream and frosting powder are good raw materials for frosting glass products, but they are suitable for different operation methods. At the same time, their role in the glass industry is complementary and complementary.

The mastic is more suitable for local frosting of glass products and is more convenient to operate, but the mastic is not suitable for large area glass frosting, mainly because it is used for large area glass frosting, it is easy to produce the phenomenon such as uneven frosting. Mastic is often used in screen printing.

Frosting powder and frosting paste compared to the operation process a little more complex, is the need for frosting powder into a solution. However, the use of frosting powder frosting applies to almost all glass products. It can not only sand glass products which can be soaked into the solution, such as glass cups, glass bottles, glass lamps, etc. , but also flat glass and sliding glass which are not suitable for soaking into the frosting solution, but there is a need for frosted glass products frosted.

04 The difference between frosted glass and sandblasted glass

Sandblasted glass

It is to hit the surface of the glass with glass sand shot out at high speed, forming a slight bump on the surface of the glass, producing a hazy effect to achieve the effect of refraction of light. The finer the glass sand is, the finer the particles are, the effect of three-dimensional sense is higher. Compared with frosted glass, the surface of frosted glass has rough handle, high breakage rate, large dust pollution and general process difficulty.

Frosted glass

Ordinary glass bottle with frosted powder frosted, is frosted glass bottle. A manufacturing process in which the surface is etched by immersion with a chemical agent, mainly in conjunction with screen printing and painting on the surface of glass.

Frosted glass

Also known as ground glass bottles, dark glass bottles. The utility model is made by treating the surface of ordinary flat glass into a uniform surface by means of mechanical sandblasting, manual grinding or hydrofluoric acid corrosion, etc. . Because the surface is rough, so that light diffuse reflection, transmission and non-perspective, frosted glass bottle can make light soft and not harsh. Too thin glass is not suitable for frosting.

05 Matters needing attention of frosted sand

1) sanding fluid must be prepared in plastic or corrosion-resistant metal containers.

2) rubber gloves should be worn to prevent burns to the skin. If contact with skin is made carelessly, rinse with water in time.

3) glass surface must be cleaned.

4) the amount of acid should be adjusted according to different glassy materials, must first add water and then add sulfuric acid.

5) before the use of sand coating liquid to stir evenly, when not in use, store covered.

6) in the use of frosting liquid, to timely add frosting powder and sulfuric acid.

7) the waste water in production can be neutralized with quicklime and discharged later.

06 Application of sand coating

Artwork

With the improvement of people's aesthetic level of art works, more and more people pay attention to display arts and crafts, in which a large part of the arts and crafts shape made of glass. Nearly half a century, glass art design with unprecedented depth and breadth of penetration into people's lives. In the shape of different types of glass and the use of manufacturing techniques in the history of glass at any time. A good glass handicraft, not only a decoration, more appreciation and collection value. Ordinary glass handicrafts after frosting, the surface gloss is soft, feel smooth and delicate, such as jade-like white flawless, moist and clean.

Decorate

An ordinary piece of glass, after frosting treatment, and then with a variety of techniques in the glass surface made a variety of beautiful patterns, using it as home partition, screen or wardrobe, kitchen sliding door, bathroom sliding door... ... To meet our needs in life, but also to bring us a simple, pure, quiet and natural flavor . Frosted sand itself unique moist, implicit and colorful patterns bright, the perfect combination of classical beauty and modern beauty, so that our home environment more modern flavor and sense of art. The application of frosted glass in home decoration not only meets people's aesthetic needs, but also protects people's privacy.

Technology

In the twenty-one st century, computers, televisions and cell phones have become an indispensable part of people's daily life. The traditional display screen radiation is too big, the light is dazzling, in people's eyesight has serious adverse effects, once exposed to light, but also easy to reflect light like a mirror, so that people can not see the screen behind the screen, has greatly affected people's daily life. The appearance of non-reflective frosted glass completely improves this phenomenon.

Glass packaging

The cosmetic packaging industry uses sand bottle as the main material of cosmetic packaging market, which is favored by the majority of consumers because of its noble and elegant appearance. And frosted after the glass surface extremely fine frosted particles, feel fine, the surface of the bottle exudes such as jade-like luster. And the glass itself stable characteristics, effectively prevent cosmetics in the light irradiation and cosmetic bottles from chemical reaction, such as better guarantee the quality of cosmetics.

Bottle Packing

Frosted sand bottle, after frosted process of the bottle, forming a hazy, noble and elegant visual effect, feel more delicate than ordinary glass bottle, smooth. For example, after a wine bottle is sanded, it can not only improve the quality of the product quickly, but also effectively prevent light from entering, thus avoiding the reaction of light to the wine to the greatest extent, can better guarantee the quality of wine, the relative extension of the shelf life of wine. Compared with other types of packaging, matte wine bottle in both practical and production technology are unique advantages. Now there is great competition in the wine industry, in order to develop in the competition, it is necessary to increase their own design and weight.