SU1348306A1 - Method of application of metal coatings on fine mineral fibres - Google Patents

Abstract

The invention relates to the chemical industry, is intended for the metallization of fine mineral fibers and can be used in the radio engineering and textile industry. The invention is aimed at increasing the productivity of the process, obtaining high electrical conductivity of the fibers with a lower thickness of the coating due to an increase in its density while ensuring corrosion resistance. Metallization of the fibers is carried out continuously in a bundle or a multifilament yarn at a constant speed of drawing not more than 0.01 m / s. The solutions are processed by ultrasonic vibrations with a frequency of no more than 2 kHz and an intensity (in water) of I — 2 W / cm. The treatment time of the bundle in solutions: during the operation of sensitization 5-6 minutes, the actual activation 2-2.5 minutes, chemical coppering 8-10 minutes, galvanic copper 40-45 minutes or galvanic copper 30-35 minutes and electroplating cadmium plating 8- 10 min. 2 (P & 0 4 X CO

Description

The invention relates to the chemical industry, is intended for the metallization of fine mineral fibers and can be used in the radio and textile industry.

The purpose of the invention is to increase the productivity of the process, to obtain a high electrical conductivity of the fibers with a smaller thickness of the coating due to an increase in its density while ensuring corrosion resistance.

When performing a continuous metallization process, the complex yarns at different operations must be at different times in the solutions. This is achieved by using baths of various lengths (volumes) or by lengthening the path of the filament (tow) in solution, for example, by introducing a rolling table mechanism.

The manufacture of metalized fibers by this method provides for obtaining dense coatings, as a result of which the fibers have better electrical conductivity with a smaller thickness of the coating, as well as their better crumbiness due to the lower looseness of the surface layer of the coating.

To ensure the corrosion resistance of the coating of metallized fibers during their long-term storage and, consequently, to maintain good electrical conductivity and density of coating of these fibers over time, an additional galvanic cadmium plating operation was introduced for 8-10 min with ultrasonic treatment of the solution. increases due to less electroplating time up to 30-35 minutes and coating characteristics do not deteriorate.

Complete replacement of electroplating by electroplating does not provide a coating with the same conductivity characteristics, since the cadmium bath creates a less dense and conductive coating on the fibers.

The method regulates as follows.

Treatment of metallization solutions with ultrasonic oscillations

18-20 kHz, with an intensity of 2 W / cm, is performed on all operations of the process. A polyethylene film is used to isolate the walls of the baths from the plating solutions. The thread speed of the multifilament yarn is 0.01 m / s.

1. Activation

Sensitization, 5 min.

Composition,%:

Sn Clj, - O2-5

HC11-6

PAV0,01-0,1

WaterEverything

Actually activation, 2 min. Composition,%:

PdCl,

1.5-2.5

0.5-1

Rest

Surfactant

HC1 Water

pH 1.75.

2, Chemical copper plating, 10 min.

Composition, %:

CuSO, 5-1,5

Segnetovo salt 1,5-4,6

0.1-0.6 0.01-0.15

Formalin (40%) 1.0-3.0

NaOH0.8-1.0

WaterEverything

pH 12.1.

.. Electroplating, 40 or 30 min.

Composition,%:

CuSO 20-22

(NH) 6-6

Ethylenediamine12-13

WaterEverything

pH 9. Current density 3 A / dm.

4. Electroplating, 10 min.

Composition, %:

CdS044,5-5,5

(NH) SO 21-23

Dispersant NF (A) 4-6

Emulsifier OS-20 0.001-0.015

Acetic acid

to pH4.5

WaterEverything

Current density 0.8 A / dm. After each operation, there is a washing of the fibers (complex threads) in distilled water for

5 minutes with forced warm air drying.

Made metallized fibers by a known method have a specific resistance of a unit

31

95–120 ohms / cm across with a coating thickness of 5–6 µm. During metallization with the continuous method, the metallized fine mineral fibers have a thickness of 3-4 μm and a specific resistance of 80-100 Ohm / cm, and with additional cadmium plating at a thickness of 3-4.5 μm, the specific resistance is 86-110 Ohm / cm.

In the manufacture of metallized fibers by a known method, they are partially destroyed during the pickling operation due to the high concentration of hydrofluoric acid in the solution and uneven coating on the fibers.

Thus, the use of the proposed method of metallization of fine mineral fibers provides the following advantages:

the implementation of a continuous metallization process;

eliminating the need for pre-cutting and fiber orientation using a special clamp;

increase in the performance of the metallization process;

obtaining high electrical conduction of fibers with a smaller thickness of the coating due to an increase in its density

Compiled by N.Ilinykh. Editor M.Petrova Tehred L.Serdyukova Corrector O. Kravtsova

Order 5159/22 Edition 427 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4.

0

five

thirty

Claims (1)

ensuring the anticorrosion resistance of the coating and good crumbiness of the metallized fibers during their long-term storage. Invention Formula The method of metallization of mineral mineral fibers by activating and chemically galvanic copper plating of fibers, characterized in that in order to improve the process performance, to obtain high electrical conductivity of fibers with a smaller thickness of the coating due to increasing its density while ensuring corrosion resistance, the fibers are metallized continuously in a tow or complex thread at a constant speed of broaching not more than 0.01 m / s, in all operations, the solutions are processed by ultrasonic vibrations with a frequency of no more than 2 kHz with intensity (in water) 1-2 BT / CM J; the time of treating the bundle in solutions at 25 sensitization operations is 5-6 minutes, the actual activation is 2 t2, -5 min, chemical copper - 8-10 min, electroplating copper plating - 40-45 min, or galvanic copper plating - 30-35 min. and electroplating cadmium plating 8-1 o min. 0