A method of obtaining a thin mica paper

 

(57) Abstract:

The invention can be used in the manufacture of electrical insulating and heat materials. The method includes armirovanie mica at t = 250-850°C for 10-60 min, treatment with a special solution, peroxide compounds for 0.25 to 48 hours, hydraulic dispersion make, grading upward flow of water with a speed of 8 to 20 cm/min and reflux of the paper web. The technical result is to obtain a thin mica paper with a thickness from 5 μm mica phlogopite and Muscovite with ensuring a high level of electrophysical and mechanical characteristics. table 1.

The invention relates to the manufacture of mica paper and can be used in the manufacture of electrical insulating materials.

A method of obtaining electrical insulating mica paper, including armirovanie mica, processing it with a solution of hydrogen peroxide, hydraulic and dispersion make subsequent outflow of the paper web (USSR, A. S. N 1356009, publ. 30.11.87 g, class H 01 B 19/00). There is a method allows to obtain high-quality paper on any natural water without artificial softening.

However, this method does not allow the atoms present invention is to obtain a very fine mica paper with a thickness from 5 μm mica phlogopite and Muscovite with a high level of electrophysical and mechanical characteristics.

This result is achieved by the fact that in the proposed method of obtaining a thin mica paper with a thickness of 5 μm is armirovanie mica phlogopite and Muscovite at a temperature of 250-850oC for 10-60 min, processing it with a solution of peroxide compounds for 0.25 to 48 hours in a solution of the following composition, wt.%:

Peroxy compound - 1-40

Catalyst - 0-20

Water - the Rest

hydraulic dispersion, classification mica pulp upward flow of water with a speed of 8 to 20 cm/min and the subsequent low tide sheet of paper.

When armirovanie crystal mica increases its interplanar distances through the allocation of water bound in the crystal structure. When processing such a crystal solutions of peroxide compounds is the penetration of the solution into the volume of the crystal mica, multiple increase its volume and separation by cleavage planes. Hydraulic dispersion make it destroys the expanded crystal mica, thus obtained particles of mica with a high characteristic ratio: more than 2000. Subsequent classification makes it possible to separate the usable particles of mica for shimmer high quality mica paper on plascoat is presented in redox reactions. The catalyst speeds up the process of swelling mica and allows you to embed this process into existing production lines of mica paper. As peroxide compounds using hydrogen peroxide.

The claimed method is illustrated by examples.

Example 1

Crystals of phlogopite terminous at a temperature of T = 350oC for 15 minutes and placed in an aqueous solution containing 7% hydrogen peroxide, and 8% of catalyst was incubated for 3 hours, water was dispersed classified at 19 cm/min and cast on the paper machine.

Example 2

Crystals of phlogopite terminous at T = 250oC for 30 minutes and placed in an aqueous solution containing 10% hydrogen peroxide and 10% catalyst, incubated for 24 hours, water-dispersed, are classified in 16 cm/min and cast on the paper machine.

Example 3

Crystals of Muscovite terminous at T = 800oC for 15 minutes and placed in an aqueous solution containing 10% hydrogen peroxide and 10% catalyst was incubated for 15 hours, water-dispersed, classified in 8 cm/min and cast on the paper machine.

Example 4

Crystals of Muscovite termer is their 48 hours hydraulically dispersed classified in 9 cm/min and cast on the paper machine.

As can be seen from the table, the present invention enables to obtain a thin mica paper with a thickness of 5 μm with high electrical and physical properties.

A method of obtaining a thin mica paper with a thickness of 5 μm, including armirovanie mica phlogopite and Muscovite at a temperature of 250 to 850°C. for 10 to 60 min, treated with a solution of peroxide compounds are within 0.25 to 48 h in a solution of the following composition, wt.%:

Peroxy compound is 1 - 40

Catalyst - 0 - 20

Water - the Rest

hydraulic dispersion make, classification mica pulp upward flow of water with a speed of 8 to 20 cm/min and the subsequent outflow of the paper web.

 

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