SU63000A1 - Method for increasing the strength of dyes with substantive and acid dyes - Google Patents

Description

The present invention relates to a process for increasing the strength of dyes with substantive and acidic dyes.

The authors found that the products of deep condensation of phenyl and p-chlorof; nilbi guanide, being converted into an aqueous solution by adding an equivalent amount of acetic acid, precipitate some direct dyes from a boiling aqueous solution of 1: 200.

The ability to precipitate direct and acid dyes with these drugs is extremely high: ka in comparison with other drugs.

The condensation products of phenyl and p-chlorophenylbiguanide with formalin were tested: on many substantive dyes.

After processing the nitrated, colored straight: pure blue or diamine red F, plus 5% condensate solution prepared from phenylbiguanide, drying and ironing (iron temperature 140 °), the color becomes durable to water, weak to washing and does not change in the light . The product obtained from p-chlorophenylbiguanide and formalin is inferior to that indicated above.

Both condensates give hardening of the color K to light tones of dyes, not changing their shade. When hardening dark color strength is negligible.

Example. 17.7 g of feblossalloid are mixed with 20 ml of water and 17 g of 36.5 per cent of formalin; when this occurs, the dissolution and heating of the mass. After 3 hours, oil is released at the bottom of the vessel. After two hours of heating in a boiling water bath, the oil solidifies. It is separated from the aqueous solution, dissolved in 30% acetic acid, and precipitated with ammonia or 40% IM sodium hydroxide solution.

The white, cheesy precipitate that formed was filtered off, washed with water and dried. The white or slightly creamy powder obtained is dissolved in an equivalent amount of acetic acid previously diluted with water to the desired concentration. For the deposition of substantive dyes from a boiling aqueous solution of 1: 200, 0.5-1 percent solutions of the preparation in the form of an acetic acid or other salt can be used. Preparation of the drug is simple in hardware otnush-vnii and can be made entirely from domestic raw materials.

The subject of the invention is a method of enhancing the strength of colorings by substantive and acidic colors by using an aqueous solution of formaldehyde condensation products with a compound of the biguanide group, characterized in that a solution of the biguanide condensation products, for example, phenyl or p-chlorophenylbiguanide, is used to harden the colors.