Chemical vapor metallization textiles and nonwovens

 

(57) Abstract:

The invention relates to a technology for metallic woven and nonwoven materials and can be used for the manufacture of protective clothing from magnetic radiation and static electricity, for the manufacture of decorative and finishing materials. Chemical vapor metallization is carried out at full force pumping vapors of the metal carbonyl source through a woven or non-woven material in a shallow vacuum. The source material is heated to a temperature of the beginning of decomposition vapors, but not above the temperature of decomposition of the source material, the side opposite to the flow of vapor of the metal carbonyl. When the metallic coating is applied across the thickness of the bulk material. table 1.

The invention relates to a method for producing metallized textiles and nonwovens and can be used for the manufacture of protective clothing from magnetic radiation and static electricity, as well as for the manufacture of decorative and finishing materials,

Known methods of applying metallic coatings on textile fibers and fabrics from the solutions. (U.S. Pat. Germany N 3125266, MCI D 06 M 11/83, 1993; p is westline produce large quantities of wastewater, what affects the environment and may require significant clearing.

There is a method of metallization of the tissue, which is closest to the technical nature of the proposed method and adopted us as a prototype (Journal of applied chemistry I. 47, S. 606 - 610, in "Science", 1974). The method is as follows. The system consists of a camera cover that from the evaporator is directed pairs of the carbonyl of one or more metals, liquid CARBONYLS pre-poured into the measuring device, the crystal is poured into sublimator. The movement of the vapors is carried out using vacuum. Metallized fabric is fixed on the massive copper plate, heated by infrared rays by using lamps to a temperature of thermal decomposition of CARBONYLS. Camera with two sides have glass screens and equipped with a shirt that serves the cooling water. Metallization of different samples is carried out in a vacuum of the order of (1-2)10-1mm RT.article Nylon fabric metallizer in the temperature range from 70 to 170oC at a feed rate of the vapor of carbonyl Nickel of 0.58 l/min Speed metallization 0.5 g/H.

The disadvantage of this method is that the coating is applied only by filing a carbonyl, stumps cannot be coated over the entire thickness of the bulk tissue, and to achieve necessary for the decomposition of carbonyl vapor temperature on the outer side of the fabric you want to overheat her side of the heater, which can lead to destruction of a cloth material or melt.

An object of the invention is a metal coating on the fibers throughout the thickness of the bulk material.

The technical problem solved by the proposed method metallization textiles and nonwovens thermal dissociation of the vapour of the metal carbonyl under reduced pressure, in which, according to the invention, to perform a forced flow vapor carbonyl metal through the original material, while the surface of the material located on the side opposite to the supply carbonyl vapor is heated to a temperature of the beginning of its decay, but not above the temperature of decomposition of the coated material. The method is as follows. Metallized fabric tightly fixed on the wide part of the funnel-shaped device, and another part of the device of small diameter is inserted into the tube feeding vapors of carbonyl metal within the reactor so that the fabric is parallel to the heater at a distance of 5 to 15 mm in the Ares of the carbonyl. After reaching the necessary vacuum is a heater and its temperature is brought to a value that provides heating of the outer cover material up to the temperature of the beginning of decomposition vapors used metal carbonyl. Then, the reactor serves a pair of metal carbonyl and the process is carried out before application to the fibers or nonwoven material of metal in a specified quantity. The zone of decomposition vapors of the metal carbonyl is moved according to the thickness of the tissue from the area of its heat to the inlet side of the vapor carbonyl due to the deposition of metal on the fiber and increase their conductivity.

Example.

Non-woven material based on polypropylene with a diameter of 50 mm, thickness 1.5 mm hermetically fixed on the wide part of the funnel. Another part is tightly inserted into the tube feeding vapors of carbonyl metal within the reactor. The gap between cloth and plate graphite heater is set to 10 mm, the Reactor is closed, vacuum to a residual pressure of 10-2mm RT.art., a heater and raise its temperature so that the surface of the fabric it was equal to 130oC.

Then from the evaporator to the reactor during the continuous pumping of si is mentioned fibers of polypropylene, and undecomposed pair TKN is directed into the furnace to decompose heated to 600oC, and the energy liberated in the process, the carbon monoxide is burned in the burner. After 10 minutes stop the flow of vapors TKN, turn off all heaters. After cooling, the coated material to the 40oC turn off the vacuum pump, the sample is removed to determine the number of deposited metal and conduct a visual assessment totallitarian tissue. Other examples of applying metallic coatings from different CARBONYLS on various tissues in the table.

As follows from the table, in the case of applying metal coatings on the proposed method is observed deposition of a metallic film on the fiber in the whole volume of the material. In the deposition of metal on the prototype method (example 5) 1/4 part of the material thickness from the side of the heater is not covered.

The chemical method chemical vapor deposition of woven and nonwoven materials by feeding the vapor of the metal carbonyl by heating the source material to the temperature of the beginning of decomposition vapors, but not above the temperature of decomposition of the source material and in shallow vacuum, characterized in that the supply of the vapor of the metal carbonyl is carried out at full force is.

 

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