SU1172974A1 - Paper manufacturing method - Google Patents

Abstract

A method of making paper, including preparing paper pulp, introducing a water-soluble organic nitrogen-containing compound, pouring a paper web and drying it, characterized in that, in order to reduce the electrical energy of the paper, a two-quiver ammonium mist is used as a water-soluble organic nitrogen-containing compound, and the ammonium containing ammonium containing nitrogen is used. -CHi-N (CN3) g ace. CHi CH S SOOSpIGi, COOChMth i (L where n 7-9, in an amount of 0.1-0.5% by weight of absolutely dry fiber.

Description

The invention relates to papermaking methods and can be used to reduce electrification in papermaking and processing processes. The purpose of the invention is to reduce paper acceptability. The essence of the invention is that according to the method of making paper, including preparing paper pulp, pouring a paper web, drying it, and introducing a water-soluble organic nitrogen-containing compound, as a water-soluble organic nitrogen-containing compound, use the double-quaternary ammonium salt, I, I, I, I, I, I, I, I a. -CHi-CH -N (CHs) j И, СООСиНгми СООСиИнн 1 where п 7-9, in an amount of 0.1-0.5% by weight of the absolute 25 lute dry fiber. The used water-soluble organic nitrogen-containing compound, having two groups of quaternary nitrogen, effectively neutralizes the static charge of natural cellulose. At the same time, the micellar structure of the aqueous solution of the nitrogen-containing compound is such that it prevents the nitrogen-containing compound from penetrating deep into the fiber and, as a result, the surface conductivity reached. All this allows in the manufacture of paper according to the proposed method to eliminate the phenomenon of electrifiedness during its preparation and subsequent processing. The preparation of a double quaternary ammonium salt of the indicated structure is carried out in the following manner. Tetramethylethylenediamine (0.1 gmol dissolved in benzene and monochloroacetic acid alkyl ester (0.21 gmol) poured in from the reaction of monochloroacetic acid and a mixture of saturated alcohols added). The reaction mixture was stirred at room temperature for 6 h. Precipitated precipitate. are separated, washed with acetone, ether and dried. The water-soluble organic nitrogen-containing compound can be introduced into the pulp, into the filler slurry or applied onto the surface of the formed web by print and and in the sizing press, both individually and as part of coatings selected depending on the type of paper being produced. Example 1. To the fibrous suspension containing 70% sulphite softwood pulp and 30% sulphate hardwood, ground to 32-34ShR, add chemical excipients,% by weight of absolutely dry fiber: optical bleach 0.1; starch 1; glue rosin 1.5; kaolin 27; titanium dioxide 3; aluminum sulphate - to pH 5.0-5.2. Before preparing the pulp of the above composition, before leaving it on the papermaking machine grid, an aqueous solution of a two-quaternary ammonium salt in the amount of 0.5% by weight of absolutely dry fiber is added. Further, conventional techniques are used to fabricate the reflux and drying of 70 g / m offset paper. Example 2 To a fibrous suspension containing 60% softwood sulphite and 40% hardwood sulphate (35-36 ° SR),% by weight of absolutely dry fiber are added: kaolin 20; glue rosin 2,5; aluminum sulphate to pH 5.2-5.5. An aqueous solution of a double-quaternary ammonium salt is introduced into a 20% suspension of kaolin in an amount of 0.4% by weight of absolutely dry fiber before the subsequent mixing of the linine suspension with other components of the pulp. Next, from the prepared mass of paper, pouring and drying of notebook paper weighing 70 g / m is carried out. Example The offset paper is manufactured by the proposed method analogously to example 1, but the double-quaternary ammonium salt is introduced by spraying its aqueous solution through a system of sprayers. On the paper web in the grid part of the paper-making machine in an amount of 0.2%: by weight of absolutely dry fiber.

Example 4, Notebook paper was manufactured by the proposed method as in Example 2, but the double-quaternary ammonium salt was introduced by spraying its aqueous solution onto the paper web before the roll-on paper-making O amount, 1% by weight of absolutely dry fiber.

II p and me R 5. Offset paper is produced by the proposed method as in example 1 with the consumption of double-quaternary ammonium salt O, 05% w weight of absolutely dry fiber.

PRI me R 6. Offset paper is made analogously to example 1,

7297А4

but as a water-soluble organic nitrogen-containing compound, an aqueous solution of quarter-polyethyleneimine is used in an amount of 3.5% by weight of absolutely dry fiber.

Example. Offset paper is made analogously to example 3, but in a water-soluble organic nitrogen-containing compound an aqueous solution of quarter-sized polyethylene in the amount of 3.5% by weight of absolutely dry fiber is used.

15 The results of measurements of the surfaces of the density of electrostatic charges are given in the table.

0.5 0.4 0.2 0.1

(control)

6 (prototype)

7

(prototype)

Paper without processing:

offset notebook

1 - 10 2.2 102, 8. ten

3

6.7 10 1.4. 10- 1.4 °.

-S

2.2 10 -f 2.2 10

Claims (1)

METHOD FOR PRODUCING PAPER, comprising preparing pulp, introducing a water-soluble organic nitrogen compounds, low tide sheet and drying it, characterized in that, to reduce elektrizuemrsti paper as a water-soluble organic nitrogen compounds are used dvuchetvertichnuyu ammonium salt of formula (CM _{i) l} N ^f -CH1-C41-N ⁺ (CH3) ₂ C4 _t CH COOC _{m g} h _{w + s} n COOC ^ _r * rec. '+. <p where η = 7-9, in an amount of 0.1-0.5% of the mass of absolutely dry fiber.