DE1139468B - Process for the production of nonwovens - Google Patents

Description

Process for the production of nonwovens According to the application F 25732 IVc / 8k (German Auslegeschrift 1094227), binder-free nonwovens, which consist entirely or partially of water-soluble fibers, preferably polyvinyl alcohol fibers, and which are solidified by brief exposure to water, are treated with aminoplast precondensate solutions in transferred to the water-insensitive state. As aminoplast precondensate, aa 0. are mentioned: trimethylol melamine, dimethylol urea and dimethylol dioxyethylene urea.

It has been found that colored or colorless polyhalazinyl derivatives, ie. see cyanuric chloride derivatives. The reaction of the polyvinyl alcohol fibers with the polyhalazinyl compounds can be carried out in the presence of alkali in a single bath process or, in the absence of alkali, by an aftertreatment with alkali in a second bath. The hydroxyl groups of the polyvinyl alcohol react with the halogen atoms of the polyhaloazyl derivatives with elimination of hydrogen halide, which is bound by alkali.

In order to convert the polyvinyl alcohol fibers into the water-insoluble state, it is necessary that the azinyl compounds contain at least 2 active halogen atoms. For the implementation are z. B. also known cyanuric chloride derivatives in the form of dyes.

As a colorless cyanuric chloride derivative z. B. the compound of the formula obtainable by reacting 2 moles of cyanuric chloride with 1 mole of 5 -phenylenediamine-o-sulfonic acid into consideration.

Other polyhalazinyl bonds are e.g. B. tri- or tetrachloropyrimidine and their colored or colorless derivatives.

Compared to the reaction with the aminoplast precondensates according to application F 25 732 IVc / 8 k (German Auslegeschrift 1094227), the invention has the following advantages: 1. The reaction with the polyhalazinyl compounds does not require temperatures as high as the reaction with the aminoplast precondensates. For example, a temperature of 150'C is necessary for the reaction with the Dimethyloldihydroxyäthylenurea, while the reaction with z. B. the cyanuric chloride derivatives at 100 to 120'C. The reaction with the aminoplast precondensates requires the use of strongly acidic catalysts; the reaction with the polyhalazinyl derivatives, on the other hand, is carried out in a weakly alkaline range. Therefore, the fiber damage, especially when using cellulose fibers, is less when reacted with polyhalazinyl derivatives.

The aminoplasts show a more or less strong chlorine retention for treatments with water containing chlorine or washing liquors. This can be done afterwards Cleavage of HCI, e.g. when ironing, leads to severe yellowing and fiber damage to lead. This does not apply to the cyanuric chloride derivatives. 4. That Process offers the possibility of using dye-like polyhalazinyls to combine the coloring with the insolubilization of the polyvinyl alcohol.

5. When using aminoplast resins, the splitting off of formaldehyde during drying and hardening causes an odor nuisance. This is not the case with the polyhylogenazinyl derivatives. Example 1 A pre-consolidated non-woven fabric consisting of a mixture of Viskosezellwolle and water-soluble polyvinyl alcohol is impregnated with a liquor of the following composition at room temperature: 20 g / 1 dichloro-triazine, 4 g / 1 alginate, 20g / 1 NaHCO After padding 10 Min . Steamed at 100'C and then soaped at the boil for 5 minutes with 2 g / 1 detergent. The result is a nonwoven fabric which is resistant to high-temperature washing and has a real dyed color.

Example 2 A fiber fleece according to Example 1 is impregnated at room temperature with a liquor consisting of 20 g / l of the reaction product of cyanuric chloride and 1 mol of p-phenylenediamine-o-sulfonic acid. The solution is adjusted to pir = 10 by adding soda. After padding, it is fixed at 130.degree . C. for 10 minutes. A non-dyed, washable nonwoven fabric is obtained. Example 3 A pre-bonded fiber fleece according to Example 1 is treated at room temperature with a dispersion of tetrachloropyrimidine. The dispersion has the following composition: 25 g / 1 tetrachloropyrimidine, 1.5 g / 1 non-ionic dispersant, 20 g / 1 NaHCO ..

The fleece is impregnated with the dispersion at room temperature and treated for 1 minute at 120.degree. C. either with or without intermediate drying.

The fleece is resistant to boiling water.

Claims (2)

PATENT CLAIMS: 1. A process for the production of high-temperature washable nonwovens which consist entirely or partially of water-soluble or water-insoluble fibers, characterized in that, after pre-consolidation of the fiber fleece by brief exposure to water and subsequent drying, an aftertreatment with colored or colorless polyhalazinyl derivatives in the presence of To be subjected to alkali. 2. The method according to claim 1, characterized in that colorless or colored cyanuric chloride derivatives are used for the aftertreatment. 3. The method according to claim 1, characterized in that tri- or tetrahalopyrimidine or their colorless or colored derivatives are used for the aftertreatment.