Method for metallisation of dispersed woven and nonwoven materials

FIELD: technological processes.

SUBSTANCE: invention is related to technology for production of metalised woven and nonwoven materials, and may be used for production of catalysts, and also for production of decorative and finishing materials. Method includes previous chemical activation of coated material surface, using as activator glyoxal acid and/or oxalic acid. Then chemical metallisation is carried out, which is realised from solution containing bluestone. Stabiliser used is tetraethylene glycol, and reducer - glyoxal. Sodium hydroxide is used in solution to maintain required acidity.

EFFECT: invention provides for production of metalised dispersed woven and nonwoven materials using simplified technology, with simultaneous cheapening and provision of production safety due to use of proposed ingredients and their certain ratio.

2 ex

 

The invention relates to a method for producing metallic dispersion (woven and nonwoven) material and can be used for the production of catalysts, as well as for the manufacture of decorative and finishing materials.

There are various methods of applying metallic coatings on non-conductive materials: thermal spraying, followed by the magnetic pulse treatment [1]; metallization in vacuum [2] with subsequent treatment of the electromagnetic radiation [3]; thermal decomposition of compounds of the corresponding metal in a non-oxidizing atmosphere [4]; microplasma processing [5]; application of a photosensitive dispersions, catalyzing further deposition of metal by chemical means [6, 7].

The above methods of applying metallic coatings require expensive special equipment and complicated to implement.

Technically the most simple are the ways of chemical metallization elektroprovoda materials. All known methods of chemical metallization elektroprovoda materials, including fibers, consist of the following operations: preparation of the fiber surface → sensitization of the surface by special treatment → rinsing → activation of the surface by treatment with solutions of precious metals (gold, platinum, palladium) → Romania → metallization of the fiber with the use of relatively expensive reagents → washing. After each operation, the fiber is washed, and the water must be thoroughly cleansed.

The drawback of such methods is a multi-stage process and the need for expensive raw materials (salts of precious metals). In its implementation produce large quantities of wastewater, which affects the environment and may require significant clearing.

The closest technical solution is a method of metallization in which there is deposition of metallic copper on a catalytically activated surface [8], including the restoration of ions of bivalent copper in the reaction with hydroxylamine. As the activating agents used hydroxycarboxylic acid, and as antiglomerular agents - polyols. The disadvantages of this method include using a reagent such as hydroxylamine, which is at an elevated temperature, which is the necessary condition of the technological process, prone to decomposition, followed by an explosion.

The technical task to be solved by the invention is the obtaining of metallic dispersion (woven and nonwoven) materials technology simplification, cost reduction and simultaneous security of production.

The problem is solved using the proposed method of metallization of dispersed materials. The way metallization dispersed woven or non-woven materials includes a preliminary chemical activation of the surface of the coated material and subsequent chemical metallization carried out from a solution containing copper sulfate and sodium hydroxide. As activator use glyoxalase and/or oxalic acid, and as a stabilizer dispersion - tetraethylene glycol and glyoxal as a reductant, and gidrookisi sodium to maintain the desired pH of the solution.

On the surface of fabrics made of artificial and synthetic fibers and graphite (carbon) tissue has a lot of active functional groups. In particular Dacron (polyethylene terephthalate) has a carbonyl group, similar to the superficial layers of carbon fabric is also covered with various oxygen-containing groups (carbonyl, carboxyl), formed by the interaction with oxygen. In functional groups, electron density is distributed asymmetrically, and oxygen atoms always an excess negative charge. Therefore, the metal ion is quite easily adsorbed on such sites fibers, and the adsorption is accompanied by charge transfer to a more electrophilic agent. Further interaction with the reducing agent PROTEK is tons easier. Thus, on the surface of the fiber initially adsorbed individual atoms that serve as a catalyst for the further discharge of ions from a solution.

Example 1. Mylar cloth dipped in diluted 1-3% solution of NaOH at a temperature of 40-50°C for swelling of the fibers. Then the fabric for 2-3 minutes placed in an aqueous solution of the composition, g/l:

Copper sulfate 20-25

Tertatolol 2

and added with stirring an aqueous solution of an activator containing glyoxalase or oxalic acid 40-45 g/l After 10 minutes, poured an aqueous solution of a reducing agent containing, g/l:

Glyoxal 40-42

NaOH 5

The ratio of the solution of copper sulphate : the activator solution : the solution of reducing agent (2:1:1). Stirring is carried out by bubbling air at a temperature of 60-65°C. After 15-25 minutes, the fabric is removed from the metallization solution, washed and dried. If necessary, after the stage of washing the thickness of the metal layer on the fabric can be increased by electroplating using a known electrolyte copper plating.

Example 2. Graphite fiber is dipped in a dilute 1-3% solution of NaOH at a temperature of 40-50°C for activation of the surface functional groups. Wash out. Then the fabric for 2-5 minutes are placed in the solution composition, g/l:

Copper sulfate 20-25

Tetraethylene glycol 2

and with stirring, add water dissolve the activator, contains

glyoxalase or oxalic acid 40-45 g/l

After 10 minutes, poured an aqueous solution of a reducing agent containing, g/l:

Glyoxal40-42
NaOH5

The ratio of the solution of copper sulphate : the activator solution : the solution of reducing agent (2:1:1). Stirring is carried out by bubbling air at a temperature of 60-65°C. After 5-7 minutes, the fabric is removed from the metallization solution, washed and dried. The obtained graphite cloth ultrafine copper layer can be used as a catalyst in some chemical processes.

Sources of information

1. Copyright certificate №1523593.

2. Copyright certificate №314821.

3. Patent No. 2171858.

4. Patent No. 2149217.

5. Application for invention No. 2005118378.

6. Application for invention No. 2005124683.

7. Copyright certificate №681137.

8. Patent No. 2118568.

The way metallization dispersed woven or nonwoven materials, including preliminary chemical activation of the surface of the coated material and subsequent chemical metallization carried out from a solution containing copper sulfate and sodium hydroxide, characterized in that the activator is used glyoxalase and/is whether oxalic acid, as a stabilizer dispersion - tetraethylene glycol and glyoxal as a reductant.



 

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