CS214964B1 - A method of treating fibrous flakes - Google Patents

Abstract

The invention addresses the treatment of fibrous flakes for the process of manufacturing articles by electrostatic flocculation. The repair of the electrical conductivity of cellulosic a) or synthetic fiber flakes according to the invention is characterized in that 45 to 55 ° C are added to the flakes under stirring at a water treatment temperature and added at a ratio of 1 part by weight to 15 to 25 parts by weight of water 1-3% alumina, 1 to 33% of the quaternized condensation product of stearic acid with diethanolamine is added, followed by the addition of 1 to 10% of sodium potassium tartrate tetrahydrate, 10 to 40% of sodium chloride, 1 to 5% of magnesium acid and 1 to 5% of sodium nitrate, based on the weight of the fibrous material to be treated, are allowed to act for 15 to 25 minutes. The invention can be used to improve the aesthetic and utility value of textile, metal, wood and plastic materials surfaces. SUMMARY OF THE INVENTION The present invention is based on a novel combination of electrical conductivity conditioning elements of the treated flakes.

Description

2149B4

SUMMARY OF THE INVENTION The present invention provides a method for treating fibrous fibrils of cellulose a) or synthetic filaments, mainly polyamide, for electrostatic field coating.

The term " flake " as used in the field of electrical field designation refers to fibers of 0.1 to 10 mm in length, which are applied in an electric field to surfaces provided with a suitable binder. The floccule is directed by the electric pole in the field of the field line of the pole, perpendicular to the binder. Due to the positioning of the unidirectional electric field, the flake is accelerated in its displacement to the coated structure in addition to its orientation in the direction of the pole. The ability of the orientation and accelerated movement of the flakes under the influence of an electric field is in most cases ensured by the adjustment of their surface. The aim of the present invention is to provide the flake with a sufficient surface conductivity value which allows the flake to be taken up to give an electrical charge.

For the so-called conductive treatment, which is intended to ensure the elec- tricity in the electric field, many multi-mode methods are known for most fiber types, most commonly used in this technology, some of which are more practical. According to the type of fiber, we distinguish a different degree of difficulty and make adjustments. Fibers of synthetic fibers, e.g. polyamide, are more difficult to treat than cellulose fiber flakes. This is related to the high value of their electrical resistance, which, even with high relative humidity, does not decrease more significantly, since in most cases the low polarity to the non-polar nature of the synthetic fiber-forming polymer does not allow sufficient moisture absorption of the surface of the flake. The quality conductivity treatments of the blocks must give the flakes not only a sufficient value of surface electrical conductivity, but also ensure their perfect separation capability, which is especially difficult with fine synthetic qualities that have a strong kusamoadhesion tendency, manifested by flaking flakes.

The basic components of the flocculation conductivity treatment are organic compounds of the type, according to the type of flakes, generally combined with inorganic salts and oxides. Specific quaternary ammonium compounds are used, silica, manganese oxide, antimony-tartrate tartrate, chlorinated sodium, tannin, calcium carbonate, barium sulfate, calcium sulfate, aluminum oxide, quaternary metal sulfate, e.g. zirconium sulfate, N-octa-decanoyl sarcosine , phosphoric acid esters, polyvinyl alcohol and its derivatives, titanate, barium stannate. Many multi-step processes using flakes pre-treatment, which is disadvantageous from a technological and economic point of view.

The above-mentioned drawbacks are eliminated by the method of treating fibrous flakes of cellulosic a) or synthetic fibers according to the invention, which consists in the fact that the rinsed flocs are stirred at a water bath temperature of 45 to 55 ° C and at a weight ratio of 1 to 1 to 3% of potassium alum is added to a 15 to 25 wt. After a further 2-5 minutes, 1 to 33% of the quaternized stearic acid condensation product with diethanolamine is added, followed by the addition of 1 to 10% of sodium potassium tartrate tetrahydrate, 10 to 40% of sodium chloride, 1 to 5% of boric acid and 1 to 5% of nitrate. sodium, withdrawn to the weight of the treated fibrous flakes and left to skill for 10 to 25 minutes.

By the method of the invention, the electrical conductivity and the separation ability of the fibrous flakes are adjusted to desired values such that their flawless processability in the electric field coating technology is guaranteed. A great advantage of the present invention is the fact that mainly the treatment components are commonly used textile assistants in the textile industry. These raw materials are readily available, cost-effective, and provide a velvety-smooth flakes and finished product with respect to the hitherto used treatments. The exact amounts of ingredients added depend on the result that is desired to be obtained and the type of flake. Treated flake after centrifugation, drying and air conditioning at Θ5% relative humidity at 20 ° C warm-gauge surface electrical resistance at intervals of 107 7 109 Ω cm, according to the type of flake.

The way of editing is exemplified by examples. Example 1:

Treated flakes are made of polyamide Θ; 3.3dtex / 1mm. The weight ratio of the flake to the weight of water is 1:15, the water bath temperature is 50 ° C. The flakes are cleared of dirt by washing, to 100 g of pure flakes, dispersed in water, the carbon black is added to the alum. After 5 minutes, a quaternized stearic acid condensation product with diethanolamine (Syntamine KX) was added to the bath, sodium potassium tartrate tert-butyrate trihydrate, sodium borohydride, boric acid and sodium nitrate were added to the bath for a further 5 minutes and could not be treated. another 15 minutes.

The ingredients are added to the bath in the following amounts:

Quaternized condensation product of stearic acid with diethanolamine 1.3 g Aluminous potassium alumina 3 g Sodium potassium tartrate tetrahydrate 4 g Sodium chloride 40 g Boric acid 4 g Sodium nitrate 1.3 g

After centrifugation, drying and air-conditioning, the flake has a specific surface electrical resistance of the order of 10θ Ω cm at 65 ° / relative humidity. 2

Claims (2)

SUBJECT Method for treating cellulosic or filament fibers, mainly polyamide, for electrostatic field application technology, followed by centrifugation, drying and air conditioning, characterized in that the washed flakes are stirred at a water bath temperature of 45-55 ° while stirring. C and, at a bath ratio of 1 part by weight of flakes to 15 to 25 parts by weight of water, add 1 to 3% alum-potassium alum, After 1 to 33 minutes, 1 to 33% of a quaternized condensation product of stearic acid with diethanolamine is added, followed by 1 to 10% of sodium potassium tartrate tetrahydrate, 10 to 40% of sodium chloride, 1 to 5% of boric acid and 1 to 5%. sodium nitrate, based on the weight of the treated flakes, and allowed to act for 15 to 25 minutes.