DE2200224A1 - Post-treatment of optical brightener - impregnated fabrics - using cyclic carbonates - Google Patents

Abstract

Polyester or polyamide fabrics, continuously impregnated with anionic and/or dispersion brighteners, are post-treated with aq. baths contg. cyclic carbonates of formula (I) (where each R gp. is H or 1 - 4C alkyl; and n = 0 - 2). The post-treatment ensures firm fixing of the brighteners on the fabrics which do not require further steam treatment. Ethylene- or propylene-carbonate is suitable.

Description

The invention relates to a process for the continuous whitening of structures made of polyesters and synthetic polyamides with anionic and / or dispersion brighteners aqueous baths the cyclic carbonates of the formula in which the radicals -R R independently of one another represent hydrogen or a C1-C4-alkyl radical and n is 0.1 or 2, after-treated.

As representatives of the cyclic carbonates to be used according to the invention of the formula (I) are preferably ethylene carbonate and propylene carbonate, also butylene carbonate, dimethylethylene carbonate and tetramethylethylene carbonate.

The inventive method is carried out in such a way that the structures to be whitened first in a known manner with the usual whitening liquors, e.g. on the padder, impregnated, to a liquor pick-up of 60 to 90, preferably 70%, squeezed off and then for a short time, about 2 seconds to 10 minutes, preferably 4 to 20 seconds, at 40 to 10,000, preferably 60 to 980C, in one introduces an aqueous bath containing the cyclic carbonates to be used according to the invention of formula (i). Subsequent to this treatment, the structures are again squeezed off, then rinsed and dried.

As a result of the aftertreatment according to the invention with the aqueous solutions the cyclic carbonates of formula (i) is an excellent fixation of whiteners achieved on the formations; steaming of the structures is no longer necessary.

With the help of the method according to the invention, on structures. Polyesters and synthetic polyamides, e.g.

.Threads, woven and knitted fabrics, made of polyesters, such as polyethylene terephthalates, Polyesters from 1,4-bis (hydroxymethyl) cyclohexane and terephthalic acid, cellulose-2 1/2 or cellulose triacetate, and synthetic polyamides, such as poly- ε-caprolactam, Polyhexametkylendlamine adipate or poly-w -aminoundecanoic acid, higher whitening effects achieved than they have been when using the known dyeing auxiliaries obtain became. To achieve the whiteness achieved with the known auxiliaries comes one therefore in the process according to the invention with a smaller amount of whitener the end.

Compared to working without the addition of cyclic carbonates can lower working temperatures can be used in the shock liquor or immersion liquor.

The required amounts of cyclic to be used according to the invention Carbonates of the formula (I) depend on the substrate to be treated and the desired degree of whiteness; they can easily be determined by preliminary tests. In general has proven to be 1 to 20 g, preferably 3 to 8 g, of the carbonates per liter Apply treatment liquor.

It has often proven to be beneficial to use the post-treatment baths In addition to the cyclic carbonates of the formula (I), small amounts, about 5 to 15 Weight percent, preferably 10 weight percent, of that used in the whitener bath o. optical brighteners to be added.

In the case of the anionic ones which can be used in the process according to the invention and dispersion brighteners are e.g.

-to anionic brighteners from the series of riazolyl-stilbene sulfonic acid brighteners, e.g. the bis-triazolyl-stilbene-mono- and -disulfonic acids, 4-triazolyl-4'-amino-stilbene-mono- and -d.isulfonic acids, also the pyrazolines containing sulfonic acid groups, such as 3- (4'-chlorophenyl) -1- [4 '- (ß-sulfoethylsulfonyl) phenyl] pyrazoline; and dispersion brighteners from the diphenylpyrazoline series, e.g. 1- (p-sulfonylmethylphenyl) -3- (p-chlorophenyl) pyrazoline or 1- (p-sulfonamidophenyl) -3- (p-chlorophenyl) pyrazoline; the benzoxazoles, e.g. 1,2-bis [5-methyl-benzoxazolyl- (2)] ethylene; the naphthalimides, such as the N-alkyl-4-alkoxy-, N-alkyl-4-pyrazolyl- or N-alkyl-4-triazolyl-naphthalimides, e.g. N-methyl-4-methoxy-naphthalimide, N-ethyl-4- [3'-methyl-pyrazolyl- (1)] -naphthalimide, N-butyl-4- [3'-methyl-1,2,4-triazolyl- (1)] -naphthalimide or Nn-butyl-4- [4'-methyl-1,2,3-triazolyl- (2) ] naphthalimide; the coumarins, such as 3-aryl-7-hetaryl or 3-hetaryl-7-hetaryl-coumarins, e.g. 3-phenyl-7- [4'-phenyl-5'-methyl-1,2,3-triazolyl- ( 2)] - coumarin, 3-Tolyl-7-tff, 2,4-triazolyl.- 7-coumarinJ In the examples given below Unless otherwise stated, parts are parts by weight.

Example 1 A knitted fabric made of polyhexamethylene diamine adipate is made with a Solution of 1.2 parts of 4,4'-bis [4-phenyl-1,2,3-triazolyl- (2)] stilbene-2,2'-disulfonic acid (Sodium salt) impregnated in 1,000 parts of distilled water, on a liquor pickup squeezed off by 70% and then for 4 seconds in an 8000 warm solution of 5 parts of ethylene carbonate in 1,000 parts of distilled water (pH value of the solution: 3.5) dipped, then squeezed, rinsed and dried.

The optical whiteness measurement according to A, Berger on the resulting knitted fabric results in a # W of 5 compared to a polygmide fabric made with the same brightener but were lightened without the addition of ethylene carbonate An equivalent Whiteness improvement was also obtained if instead of the 5 parts ethylene carbonate the same amount of propylene carbonate was used.

Example 2.

A knitted fabric made of poly - # - caprolactam threads is mixed with a solution of 4.5 Share 4,4'-bis - [(2-diethanolamino-4-chloro-1,3,5-triazinyl-6) -amino] -stilbene-2,2 ' -disulfonic acid impregnated in i- 000 parts of distilled water, on a liquor pickup squeezed off by 70% and then immersed in a solution of at 800C for 4 seconds 0.45 parts of 4,4'-bis - [(2-diethanolamino-4-chloro-1,3,5-triazinyl-6) -amino] -stilbene-2,2'-disulfonic acid, 5 parts of ethylene carbonate in 1,000 parts of distilled water (pH value of the solution: 3.5,) dipped, then squeezed, rinsed and dried according to A. Berger on the resulting knitted fabric results in a t W of 10 compared to one Polyamide knitted fabric with the same brightener but without the addition of ethylene carbonate has been lightened.

Example 3 A poly - # - caprolactam knitted fabric is made with a solution of 3 parts of 3- (4'-chlorophenyl) -1- [4 '- (ß-sulfoethylsulfonyl) -phenyl] -pyrazoline in 1 OOO T parts of water impregnated, to a liquor pick-up of 70 % squeezed off and then for 4 seconds in an 80 ° C solution of 0.3 parts 3- (4'-chlorophenyl) -1- [4 '- (ß-sulfoethylsulfonyl) -phenyl7-pyrazoline, 5 parts of ethylene carbonate Immersed in 1,000 parts of water (pH of the solution: 3.5), then squeezed off, rinsed and dried.

The optical whiteness measurement according to A. Berger on the resulting knitted fabric results in an A W of 7 compared to a knitted polyamide fabric with the same whitener, but was lightened without the addition of ethylene carbonate.

Example 4 A triacetate fabric is with a dispersion of 1.2 Parts of 1- (4'-sulfonamidophenyl) -3- (4'-chlorophenyl) pyrazole, 3 parts of C14-C18 alkanesulfonic acid (Sodium salt), 3 parts of ethylene glycol impregnated in 1,000 parts of distilled water, squeezed to a liquor pick-up of 70% and then 4 seconds into one 95 ° C warm solution of 0.12 parts 1- (4'-sulfonamidophenyl) -3- (4'-chlorophenyl) pyrazoline, 0.3 part of C14-C18 alkanesulfonic acid (sodium alkane), 0.3 part of propylene carbonate Dipped in 1,000 parts of distilled water, then squeezed, rinsed and dried.

The optical whiteness measurement according to A. Berger on the tissue obtained in this way results in a LK W of 13 compared to a fabric with the same brightener was lightened without the addition of propylene carbonate.

An equally lightened fabric was also obtained when instead of the dispersion whitening agent used, the same amount of the dispersion whitening agent 1-p-sulfonylmethyl-3-p-chlorophenylpyrazoline was used.

Example 5 A polyethylene glycol terephthalate fabric is made with a Dispersion of 0.7 parts of 1,2-bis [5-methyl-benzoxazolyl- (2)] ethylene in 1,000 parts Impregnated with distilled water, squeezed to a liquor pick-up of 70% and then 4 seconds in a 980C warm solution of 0.14 parts of 1, 2-bis [5-methyl-benzoxazolyl- (2)] - ethylene, 5 parts of ethylene carbonate immersed in 1,000 parts of distilled water, then squeezed off, rinsed and dried.

The optical whiteness measurement according to A. Berger on the tissue obtained in this way results in a # W of 11 compared to a polyester fabric made with the same brightener but was lightened without the addition of ethylene carbonate.

An equivalent improvement in whiteness was also achieved when instead of the dispersion whitening agent used, the same amount of the dispersion whitening agent N-n-butyl-4- [3-methyl-1,2,4-triazolyl- (1)] naphthalimide was used.

Claims (3)

Patent claims 1. A process for the continuous whitening of structures made of polyesters and synthetic polyamides with anionic and / or dispersion brighteners, characterized in that structures impregnated with the whitening liquor are treated with aqueous baths, the cyclic carbonates of the formula in which the radicals R independently of one another represent hydrogen or a C1-C4-alkyl radical and n is 0, 1 or 2, after-treated. 2. The method according to claim 1, characterized in that in the fixation baths are used as cyclic carbonates, ethylene or propylene carbonate. 3. Constructions made of polyesters and synthetic polyamides tinted white according to the method of claims 1 and 2.