SU983150A1 - Soltuion for chemical copper plating - Google Patents

Description

(.54) SOLUTION FOR CHEMICAL COPPER

The invention relates to the deposition of coatings, in particular, copper and moxet, to be used to obtain plexiglas nets and scales.

A known solution for chemical copper plating, containing copper salt, sodium tartrate, caustic alkali. Formaldehyde 1.

However, this solution, due to the absence of stabilizing and leveling additives, does not allow to obtain a black coating. In addition, the resulting coatings are uneven and unstable to moisture and oxygen.

The closest to the invention of the technical essence and the achieved result is a solution for chemical copper plating, containing copper sulfate, potassium-sodium tartrate, sodium hydroxide, formaldehyde and a surfactant, for example 2,6-diaminopyridine 2J.

However, coatings obtained from this solution have a yellow or light brown color and have a low optical density.

The purpose of the invention is to obtain black films with high optical density.

This goal is achieved by the fact that the solution for chemical copper plating, containing copper sulphate, potassium-sodium tartrate, sodium hydroxide, formaldehyde and a surface-active additive, contains triethanolamine, and as a surface-active additive is an alkyldimethylamine N-oxide of general formula

ten

R-no

CHj

15

where R-CpHirm and p 10-18 at. the following ratio of components, weight. %: |.

Copper sulfate 3-4

Potassium sodium vinokis 20 lyy15-17,5 Sodium hydroxide 4.5-5.5 Formaldehyde 2.6-3.7 Triethanolamine 0.4-0.6 N-oxide alkyldimethyl 25 amine 0.08-0.14 Water Else Process is carried out at 18 -20 ° C and pH 13 for 7-12 minutes.

Example. Fat-free polymethylpolyacrylate plastics (etched in concentrated sulfuric acid for 5 min, washed and activated by watering with a solution consisting of one volume of PdClj solution (3.54 g / l), two volumes of solution (KH4) 3С (С204) ЗН- 20 (8.56 g / l) and 0.5 volumes of a wetting agent, which is an aqueous solution of glycerol 10 g / l; with the addition of OP-7 (2 g / l; exhibit a source of UV and radiation through the negative for 20 The exposed plates are washed for 1 min in distilled water, placed in a solution of copper composition, wt.%: copper sulfate 35; potassium sodium tartrate 1.70; sodium hydroxide 5.0, - 37% formaldehyde 100 ml / g triethanolamine 0.5; N-oxide alkyldimethyl thylamine 0.13, at pH 13 and 18–20 ° C for 8 min. The finished drawings on Limethyl methacrylate (PMMA) are washed with cold running water for 3 minutes and treated with a solution of benzotriazole 10 g / l at 80 ° C for 5 minutes. After this, the plates are washed again for 3 minutes with cold running water, rinsed with distilled water and dried for 10 minutes at room temperature. The finished plates were heated at 130 ° C for 40 minutes to return the original transparency to the PMMA gaps. Copper sulfate, 3 Potassium-sodium tartrate 15 Sodium hydroxide, 4,5 Formaldehyde 37-th Triethanolamine 0 4 Alkyldimethylamine H-oxide 0, 08 Process time, min 12

In tab. 2 shows a comparison of the properties of copper patterns obtained on photochemically activated PMMA from the proposed copper plating solution and the famous 13 (but c. Increased 17.5 5.5 2.6 70 ml / l 3.3 (90 ml 0.14 Remaining 7

Claims (2)

the amount of formaldehyde / as with a low content of copper deposition in voobie does not occur), as well as the stability and productivity of 65 of both baths. The resulting figures are uniform, have a deep black color (3-4 density), a clear edge, resolution up to several tens of lines per 1 mm. The transparency of the gap plots at 95-98.% Coincides with the transparency of the original plates. The obtained patterns withstand cyclic tests: 5 cycles for 2 h including heating at 120 ° and abrupt cooling with liquid nitrogen. Figures withstand severe climatic tests for 10 days or more at 40 ° C and a relative humidity of 95-100%. As a result of the tests, the appearance of the patterns and the decrease in the optical density of the areas coated with copper do not change. Figures are not slitted or cracked, and transparent PMMA gaps do not change their appearance. The solution used is stable in the presence of activated PMMA samples for 2 hours, and in their absence it is 36 hours and allows it to be made tenfold or more and it is used to process plexiglas plates with an area of 1.0-1.2 1 l of the solution without adjustment. In tab. 1 shows examples of the formulations of the proposed solution. Table 1 (100 ml / l; / l) The resulting images with cyclic testing withstand five or more cycles. The drawings obtained from the proposed solution are characterized by uniformity, sharpness of the edge, lack of copper in the gap areas, deep black color, as well as strong adhesion to the substrate and high corrosion resistance not only under normal conditions, but also under hard cycling (4x and climatic conditions). tests The last two qualities are achieved as a result of special processing of finished copper drawings, ineffective when using a solution of copper mixtures of other compositions. The proposed solution is stable for 24–48 hours in the catalytically active surface, the stability of known PMM plating solutions is 20-300 minutes, the solution capacity, expressed in the amount treated in the solution without the surface correction of PMML, is 4–6 times higher than that of the known plexiglass copper plating baths. Thus, the coatings obtained from the proposed solution have a deep black color, are uniform in thickness and are resistant to cyclic and climatic tests and possess. high optical density. Claims A solution for chemical copper containing copper sulphate, potassium tartrate, sodium hydroxide, formaldehyde, and a surfactant that is characterized by the fact that, in order to obtain black films with high optical density, it contains triethanolamine, and an active additive is an alkyldimethalamine N-oxide of the general formula, where P-SpN2p + 1I p 10-18 with the following ratio of components, wt.%: Sulfuric acid copper 3-4 Potassium sodium tartaric 15-17, 5 Sodium hydroxide. 4.5-5.5 Formaldehyde 2.6-3.7 Triethanolamine 6.4-0.6 N-oxide alkyldimethylamine 0.08-0.14 Water Else Sources of information taken into account during the examination 1.Patent dlA № 3,915,809, CL, 204-15, published. 1975. 2. USSR author's certificate number 561753, cl. C 23 C 3/02, 1974.