DE3136527A1 - Process for dyeing paper stock - Google Patents

Abstract

The invention relates to a process for dyeing paper stock, which is characterised by the use of compounds of the formula I <IMAGE> in which Kat<(+)> is a monovalent cationic radical of a hydrophilic amine. This gives dyeings having good fastness properties, preferentially on the wire side.

Description

Process for dyeing paper stock

The invention relates to a method for dyeing paper materials, which is characterized in that compounds of the formula I. used, in which Kat # is a monovalent cationic residue of a hydrophlic amine.

The cations Kat # are derived from hydrophilic amines, e.g. 9. such, which may have chains broken by oxygen and by hydroxy and alkoxy can be SUD-substituted.

Individual amines are, for example, H2NC2H4OH, HN (C2H40H) 2, N (C2H4OH) 3, H2NCH2CH2CH2OH, HN (CH2CH2CH2OH) 2 'N (CH2CH2CH2OH) 3, H2NCH2CHOHCH3, HN (CH2CHOHCH3) 2, The compounds of the invention can, for. B. be prepared by reacting the free acid of the compound of formula I with an amine or amine mixture, preferably in a stoichiometric ratio, small excesses of amine can be useful because of an improvement in solubility.

The compounds of formula I are very soluble in aqueous media, for example, up to 25% solutions can be produced. Such solutions are suitable excellent for coloring paper stocks, e.g. B. sized and unsized, lignin-containing and lignin-free papers.

The special feature that should be emphasized is that in the presence of fillers - also in low proportions of the total amount of paper - those of fines and fillers the poorer side (wire side of the paper machine) is dyed deeper.

This property is observed only in a few cases and is very great valuable because you can combine it with dyes that are predominantly the top stain (such compounds are particularly common with the well-known blue dyes For the mass coloring of paper commercially available) evenly on the top and bottom can produce colored papers.

The dyes are also characterized by high lightfastness from what enables it to be used for the production of high-quality colored papers.

The compounds of the formula I are also used for dyeing leather suitable.

Of particular importance are compounds of the formula I in which the cations are derived from the following amines: HN (CH2CH2OH) 2, N (CH2CH2OH) 3, HN (CH2CH2CH2OH) 2 or N (CH2-CH2CH2oH) 3 * In the following examples Unless otherwise stated, parts and percentages are based on weight.

Example 1 51 parts of water and 9 parts of diethanolamine (80-aSoiO) are used presented and heated to 40 OC. 15 parts of solid 1,5-dihydroxy-4 are carried with stirring , 8-diaminoanthraquinone-2 6-disulfonic acid (nlizarinsaphirol B, manufactured according to FIAT 1313, Vol. II, p. 211), cools to room temperature and filtered through a folded filter. An aging-resistant 20% strength aqueous solution of the dye is obtained.

Example 2 300 parts of triethanolamine and 1460 parts of water are initially introduced and heated to 50 ° C. 430 parts of the free color acid are carried with stirring Alizarin Sapphirol B.

After stirring for one hour, the mixture is cooled to room temperature and the resulting Solution filtered. No residue remains on the filter.

The dye solutions listed in the table were obtained analogously to Example 1. Example no. Color acid Amine used 1 H2N O OH 3;) 03H H2N-CH2-CH2-OH HO, S 5 3 HONH2 4 .. 2N CH2-CH2-O-CH2-CH2-OH 5 II 9 NH-CH2-CH2 ° H 6 .. CH3-N (CH2CH2OH) 2 7 .. CH3 N (CH2 CIHCH3) 2 OH 8 .. N (CH2-CHoHCH3) 3 9 tu HN (CH2CHOHCH3) 2 10 It H2NCH2CHOHCH3

Example 11 To 1 kg of an aqueous paper stock suspension of 3% consistency Consists of 70 parts of bleached pine sulphate pulp and 30 parts of bleached Birch sulphate pulp becomes 150 mg of the dye of Example 1 in the form with stirring added to a 1% solution. Then, by adding 300 mg of resin glue (calculated 40% dry weight) and 900 mg aluminum sulfate 18 H20, a sizing was carried out and on a laboratory sheet maker from

Rapid Köthen sheets of 80 g / m2 basis weight formed.

The paper sheets show a calm medium blue color of good Lightfastness.

The white water shows only a small amount after the fines have settled Staining.

Example 12 To 1 kg of an aqueous paper stock suspension with a Freeness of 28 ° SR and 3% consistency, consisting of 60 parts of bleached pine sulphate pulp, 30 parts of bleached birch sulphate pulp and 10, "China Clay, are made, as in Example 11 mentioned, dye, aluminum sulfate and resin glue added and leaves formed from 80 3 basis weight. The sheets of paper show a calm coloring, which is stronger on the less subtle side than on the opposite side.

Example 13 For comparison, Example 12 is repeated, using by Direct Blue 86, C.I. 74 180, as a dye.

The coloring shows an opposite distribution of the color strength.

Example 14 On a suction screen paper machine 65 cm wide is produced a paper web at a speed of 60 m / min.

A mixture of 20 parts of bleached birch sulphate pulp, 20 parts of bleached pine sulphate pulp, 60 parts of bleached spruce sulphite pulp, 1 part resin glue, 25 parts kaolin and 3 parts aluminum sulfate are used. As dyes are used one after the other under otherwise identical conditions: Direct Blue 86 C.I. 74180 Direct Blue 15 C.I. 24400 dye of Example 1 While in the Dyeings with the three first-mentioned dyes make the sieve side significantly weaker is colored than the top, occurs when using the dye of the example 1 a stronger staining of the sieve side.

Claims (1)

Process for dyeing paper stock, characterized in that compounds of the formula is used in which Kat # is a monovalent cationic residue of a hydrophilic amine.