Each person's taste and aesthetics are different, the requirements for the decoration of the stone will be different, especially the choice of the color texture of the stone, it varies from person to person. In order to meet the needs of different consumers for stone, and to make up for the shortcomings of natural stone color, foreign stone production and processing companies have been studying natural stone coloring technology since the 1970s, especially in the United States and Japan. Have achieved very fruitful results. At present, the more mature stone coloring technology in foreign countries, in general, includes the following categories:
1. The color body is an organic dye or pigment
According to its process, it can be divided into two types:
(1) The coloring agent (generally various organic dyes) is first infiltrated into the interior of the micropores of the stone, and then fixed or sealed.
(2) The coloring agent is infiltrated into the inside of the micropores of the stone together with the unpolymerized resin monomer solution, and then polymerized and solidified.
Over the years, the United States, Japan and France have successively studied a variety of stone coloring methods. Generally, the organic dye or the inorganic pigment is dissolved in a solvent, and is immersed under normal temperature or heat under reduced pressure, normal pressure or pressure; or sprayed or brushed to allow the coloring solution to penetrate into the pores of the stone. It has also been found that the presence of some organic solvents and surfactants facilitates the penetration of the coloring solution. In the case of brushing, in order to spread the coloring solution on the surface of the stone quickly and uniformly, and avoiding the formation of liquid beads, a certain amount of silica powder having a particle size of 35 to 70 nm is added to the coloring solution. The stone soaked, brushed or sprayed by the coloring solution is rinsed with water, dilute copper sulfate or a dilute calcium chloride solution after the solvent is volatilized, and then ground and polished to obtain a desired color. Generally, the coloring depth is 2 to 5 mm. The above-mentioned coloring methods are characterized by being easy to handle, bright in color, and resembling natural stone. The biggest problem is poor weather resistance, especially for outdoor use.
According to the research of S. Clemens of the US GAF company, the stone can be dyed with vat dyes and azo dyes, and the dyeing method can be carried out by a known dyeing process. For example, if it is desired to obtain a dark green granite, such a dyeing solution can be prepared in proportion, ie 2 grams of soluble reducing green, plus 2 grams of GLyening A, plus 10 grams of water and 10 grams of ethanol. The prepared dyeing solution was applied to the surface of the granite and allowed to stand for 30 minutes, and then the dyed stone was colored with a coloring agent for 1 hour under standard conditions. The color former is a solution consisting of 50 parts of hydrogen peroxide (30 to 50%) and 50 parts of ammonium vanadate (1%). The colored stone is washed with water to remove excess lake, and after wiping, it is subjected to a post-treatment process. The granite thus dyed can obtain dark green with excellent light fastness, which is in contact with acid and oil, and the color is not affected.
S•Clemens pointed out that although many kinds of compositions and methods have been proposed for stone dyeing, there are some shortcomings, especially black, the oxidation rate is too slow, the color is too weak or not uniform, and the black color is not correct. Or micro-strip red or gray, especially after a period of storage. In order to improve the dyeing effect, he proposed a new composition of the dyeing solution and a method of dyeing processing. The main components of this dyeing solution are oxidative chromophores, acetic acid and alkylbenzene sulfonic acid. These mixed components are dissolved in a volatile organic solvent medium and then uniformly infiltrated into the stone to be dyed by a suitable method such as spraying, brushing, rubbing. The evaporation process takes 10 to 45 minutes. The oxidation treatment is then carried out with a certain amount of oxidizing agent, and it takes 5 to 60 minutes to achieve complete oxidation, that is, complete color development. After the color is completely washed, the chromosome is quickly washed, and then post-treatment processing such as polishing and polishing is performed to obtain a desired color.
2. The color body is an inorganic metal oxide
According to its process, it can be divided into two types:
(1) The inorganic metal oxide colorant is first formulated into a fluid, such as a paste or a solution, and is infiltrated into the stone by applying a strong external pressure or a local chemical reaction. This type of method has a very limited penetration depth and is generally only used for coloring the surface layer.
(2) Dissolving the inorganic metal oxide in a strong acid into a solution or directly using a metal salt solution, adding a catalyst or the like, first infiltrating into the interior of the stone, and then oxidizing to form a colored metal oxide. Although the color of the metal oxide is not rich and bright, it is similar in color to the natural colored stone, has similar composition, has good weather resistance, and can be used outdoors for a long time.
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